Method for manufacturing a metal based frame, and a metal based frame

Abstract

The inventive concept relates to a method for manufacturing a metal based frame comprising the steps of: providing a first element (202) comprising a first element inner enveloping wall (204) surrounding an interior volume; providing a second element (210) having a second element outer wall (212), a second element inner wall (213), and a third element (220) having a third element outer wall (222), a third element inner wall, wherein the second element inner wall (213) and the third element inner wall each surrounds a free space (215); arranging the second element (210) and the third element (220) in the interior volume (208) such that an intermediate space (230) having an access opening (232) is formed between the first element inner enveloping wall (204) and the second element outer wall (212) and the third element outer wall (222) in a predetermined pattern; arranging a plurality of pieces of a wrought material (250) in the intermediate space (230); providing a closing member (240) arranged such that it covers at least the access opening (232) of the intermediate space (230), whereby the first element (202), the second element (210), the third element (220), the plurality of pieces of a wrought material (250), and the closing member (240) form an assembled frame arrangement (200); removing gas from the intermediate space; subjecting the assembled frame arrangement to a hot pressing process for a predetermined time at a predetermined pressure and a predetermined temperature such that at least the plurality of pieces of a wrought material bond metallurgically to each other, to form the metal based frame.

Claims

1. A metal based frame comprising: a first side, a second side arranged opposite to said first side, and a lateral side extending from said first side to said second side; a frame arrangement having an outer metal based border defined by at least the lateral side of said metal based frame, and an inner metal based member separating at least two cavities forming at least a part of said frame arrangement; wherein at least a portion of said inner metal based member has been produced by a plurality of pieces of a wrought material which have been metallurgically bonded to each other during the process of a hot pressing, such as e.g. hot isostatic pressing, for a predetermined time at a predetermined pressure and a predetermined temperature, wherein the ratio, by volume, of cavities:metal in the frame is at least 3, wherein said metal based frame comprises metallurgical detectable traces of said plurality of pieces of wrought material, wherein said metallurgical detectable traces are formed by crystallographic mismatch at interfaces between different pieces in said plurality of pieces of a wrought material; and wherein each piece in the plurality of pieces of wrought material is larger than a powder particle.

2. The metal based frame according to claim 1, wherein the shape of said outer metal based border is defined by a first element used as an outer element during the process of a hot pressing for a predetermined time at a predetermined pressure and a predetermined temperature.

3. The metal based frame according to claim 1, wherein said at least two cavities are partitioned from each other by said inner metal based member such that a predetermined pattern of said inner metal based member is formed inside of said outer metal based border.

4. The metal based frame according to claim 1, wherein said predetermined pattern is defined by a second element having a second element outer wall, and a third element having a third element outer wall, wherein said first and second elements have been arranged at least partly in an interior volume at least partly defined by a first element inner enveloping wall of said first element, such that an intermediate space has been formed between said first element inner enveloping wall and said second element outer wall and said third element outer wall in said predetermined pattern; and wherein said plurality of pieces of a wrought material which have been metallurgically bonded to each other during the process of a hot pressing for a predetermined time at a predetermined pressure and a predetermined temperature, has been arranged in said intermediate space with said predetermined pattern.

5. The metal based frame according to claim 1, wherein at least one of the cavities is a through hole.

6. The metal based frame according to claim 1, wherein the ratio, by volume, of cavities:metal in the frame is at least 5.

7. The metal based frame according to claim 1, wherein the hot pressing comprises hot isostatic pressing.

8. The metal based frame according to claim 1, wherein each piece in the plurality of pieces of wrought material is at least 1 mm in one of its extensions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above objects, as well as additional objects, features and advantages of the present inventive concept, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of embodiments of the present invention, when taken in conjunction with the accompanying drawings, wherein:

(2) FIG. 1 shows a flow-chart explaining the steps of a method in accordance with at least one embodiment of the invention;

(3) FIG. 2 show schematic, cross-sectional view of an assembled frame arrangement in accordance with at least one example embodiment of the invention;

(4) FIG. 3 shows a schematic, cross-sectional view of the assembled frame arrangement of FIG. 2 in another view, in accordance with at least some example embodiments of the invention;

(5) FIG. 4 shows a schematic, perspective view of a meat based frame in accordance with at least one example embodiment of the invention;

(6) FIGS. 5a-5d show different embodiments of metal based frames in accordance with at least some example embodiments of the invention;

(7) FIG. 6 shows a schematic, cross-sectional view of a metal based frame in accordance with at least one example embodiment of the invention;

(8) FIG. 7 shows a schematic, cross-sectional view of a metal based frame in accordance with at least one example embodiment of the invention; and

(9) FIG. 8 shows a micrograph of a trace in a metal based frame in accordance with at least one example embodiment of the invention,

(10) FIG. 9a shows a schematic perspective view of a metal based frame in accordance with at least one example embodiment of the invention,

(11) FIG. 9b shows a schematic perspective view of a metal based frame in accordance with at least one example embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

(12) In the present detailed description, embodiments of the present invention will be discussed with reference to the accompanying figures. It should be noted that this by no means limits the scope of the invention, which is also applicable in other circumstances for instance with other types or variants of methods for manufacturing a metal based frame encompassed by the scope of the claims, than the embodiments shown in the appended drawings. Further, that specific features are mentioned in connection to an embodiment of the invention does not mean that those features cannot be used to an advantage together with other embodiments of the invention.

(13) Turning to FIG. 1, showing a flow chart of the steps in a method 100 for manufacturing a metal based frame according to at least one embodiment of the inventive concept. The metal based frame being the result of the method described in relation to FIG. 1 may e.g. be identical to metal based frame shown in any of the other figures.

(14) In a first step 101, a first element comprising a first element inner enveloping wall surrounding an interior volume is provided. The interior volume is at least partly defined by the first element inner enveloping wall.

(15) The first element may e.g. be an outer element, such as e.g. an outer canister further explained below.

(16) In a second step 103, a second element having a second element outer wall, and a third element having a third element outer wall are provided.

(17) The second element and the third element may be referred to as a first inner element and a second inner element, respectively. Correspondingly to the first element, any one of the second and third elements may be an inner canister.

(18) In a third step 105, the second element and the third element is at least partly arranged in the interior volume, such that an intermediate space having an access opening is formed between the first element inner enveloping wall and the second element outer wall and the third element outer wall in a predetermined pattern.

(19) According to at least one example embodiment, in an optional fourth step 107 a plurality of pieces of a wrought material is treated by a surface treatment and/or by a deformation treatment.

(20) Hereby, the pieces of a wrought material are prepared for the metallurgical bonding during the hot pressing step, such as e.g. the HIPping process step. For example, the surface treatment of at least some of the pieces of a wrought material is done in order to ensure, or at least improve, metallurgical bonding during the hot pressing process step

(21) In an optional fifth step 109, a solid spacer is provided to the intermediate space.

(22) In a sixth step 111, a plurality of pieces of a wrought material is arranged in the intermediate space.

(23) Preferably, the plurality of pieces of a wrought is inserted into the intermediate space via the access opening. In correspondence to the optional fifth step 109, the plurality of pieces of a wrought material may be arranged on the solid spacer.

(24) According to at least one example embodiment, at least one of the plurality of pieces of a wrought material has different material properties as compared to another one of the plurality of pieces of a wrought material. Thus, the method 100 may comprise an optional seventh step 113 of arranging a plurality of pieces of a wrought material in the intermediate space such that the at least one of the plurality of pieces of wrought material is provided to a predetermined location of the intermediate space.

(25) In an eighth step 115, a closing member is provided and arranged such that it covers at least the access opening of the intermediate space, said closing member being sealingly connected to at least the first element. Hereby, an assembled frame arrangement is created which comprises the first element, the second element, the third element, the plurality of pieces of a wrought material, and the closing member.

(26) The assembled frame arrangement may e.g. be referred to as a pre-hot pressing arrangement or pre-HlPping arrangement depending on the hot pressing process used, as it has been prepared for the making of a metal based frame by hot pressing or HIPping.

(27) According to at least one example embodiment, the access opening of the intermediate space is a first access opening and the closing member is a first closing member, and the first element, the second element and the third element are arranged such that the intermediate space has a second access opening arranged opposite to the first access opening, wherein the method 100 comprises an optional ninth step 117 of providing a second closing member arranged such that it covers the second access opening of the intermediate space, which second closing member is sealingly connected to at least the first element. Hereby, the assembled frame arrangement further comprises the second closing member.

(28) The optional ninth step 117 may according to one embodiment be carried out in a parallel to the eight step 115.

(29) According to at least one example embodiment, one of the first closing member and the second closing member is provided in integral with the first element and the other one of the first closing member and second closing members is provided separately from the first element, wherein the method 100 further comprises an optional tenth step 119 of sealing the other one of the first closing member and the second closing member to the first element at least after the sixth step 111 of arranging a plurality of pieces of a wrought material in the intermediate space.

(30) In an eleventh step 121, gas is removed from the intermediate space.

(31) Hereby, the metallurgically bonding of the plurality of pieces of a wrought material is improved.

(32) According to at least one example embodiment, the eleventh step 121 of removing gas from the intermediate space comprises the sub-step 121A of providing at least one gas evacuating aperture in the assembled frame arrangement, which gas evacuating aperture is fluidly connected to the intermediate space, and the sub step 121B of evacuating gas from the intermediate space via the at least one gas evacuating aperture. Optionally, the sub step 121B may comprise a step 121C of arranging a gas evacuating crimp tube to the assembled frame arrangement, wherein an opening of the gas evacuating crimp tube covers the at least one gas evacuating aperture. For such embodiments, the method may comprise a twelfth step 123 of sealing the gas evacuating crimp tube, at least after the sub-step 121B of evacuating the gas from the intermediate space.

(33) According to at least one alternative example embodiment, the eleventh step 121 of removing gas from the intermediate space comprises the sub-step 121D of providing a chemical substance within the intermediate space, the chemical substance being configured to react with the gas in the intermediate space in order to remove the gas. The sub-step 121D is typically an alternative path to the combined sub-steps of 121A-121C and optionally the twelfth step 123.

(34) The step of providing a chemical substance within the intermediate space 121D, may be followed by a step of heating the chemical substance in order to make it react with the gas in the intermediate space (if this is required for the chemical substance used). However, the step of heating the chemical substance may be comprised in the step of subjecting the assembled frame arrangement to a hot pressing process.

(35) In a thirteenth step 125, the assembled frame arrangement is subjected or exposed to hot pressing process (such as e.g. a HIPping process) for a predetermined time at a predetermined pressure and a predetermined temperature. Hereby at least the plurality of pieces of a wrought material bond metallurgically to each other, to form the metal based frame.

(36) In a fourteenth step 127, at least a portion of one of the first element, the second element, the third element, and the closing member is removed.

(37) The optional fourteenth step 127 is preferably carried out subsequently to the thirteenth step 125. Thus, the metal based frame from the thirteenth step 125 is re-shaped or reduced in size by the optional fourteenth step 127.

(38) In an optional fifteenth step 129, the solid spacer from the optional fifth step 109, is machined away.

(39) Thus, the solid spacer is used as a sacrifice, and may thus be referred to as a solid sacrificial spacer.

(40) FIG. 2 shows a cross-section of an assembled frame arrangement 200 formed e.g. in the eighth 115 or ninth step 117 of the method 100 described with reference to FIG. 1 The assembled frame arrangement 200 has a first side 201A, and opposite second side 201B, and a lateral side 201C connecting the first side 201A with the second side 201B.

(41) The assembled frame arrangement 200 comprises a first element 202 having a first element inner enveloping wall 204 (the enveloping feature of the first element inner enveloping wall 204 is better shown in FIG. 3), which will be referred to as the inner enveloping wall 204 henceforth, and having a first element bottom wall 206, which will be referred to as a bottom wall 206 henceforth (the bottom wall 206 may also be referred to as a first element second side wall 206). The main extension of the bottom wall 206 is perpendicular to the main extension of the inner enveloping wall 204. The inner enveloping wall 204 is sealingly connected to the bottom wall 206 such that an interior volume 208 is formed inside of the inner enveloping wall 204 and the bottom wall 206. It should be noted that as the inner enveloping wall 204 and the bottom wall 206 are sealingly connected to each other, they may be referred to as wall portions, i.e. an inner enveloping wall portion 204 and a bottom wall portion 206.

(42) The interior volume 208 is at least partly defined by the inner enveloping wall 204 and the bottom wall 206. For embodiments in which the first element 202 comprises no bottom wall 206, but only the inner enveloping wall 204, the interior volume 208 is at least partly defined by the inner enveloping wall 204.

(43) As seen in FIG. 2, the assembled frame arrangement 200 further comprises a second element 210 having a second element outer wall 212 and a second element inner wall 213 surrounding a free space 215, and a third element 220 having a third element outer wall 222. The second element 210 and the third element 220 are arranged in the interior volume 208 formed by the first element 202. In FIG. 2, the second element 210 is formed as a canister having inner walls 213 surrounding a free space 215, and may be referred to as an inner canister 210. Moreover, in FIG. 2, the third element 220 is formed as a solid block 220, and may be referred to as an inner block 220. However, it should be noted that the third element 220 may be shaped differently, e.g. as a canister similar to the second element 210, and may thus e.g. form a second inner canister. The third element preferably has third element inner walls surrounding a free space. Correspondingly, the second element 210 may be shaped differently, e.g. as a solid block similar to the third element 220, and may thus e.g. form a second inner block. Preferably, both elements has inner walls that surrounds a free space 215.

(44) The second element 210 and the third element 220 are arranged inside the interior volume 208 such that an intermediate space 230 is formed in a predetermined pattern. The intermediate space 230 is at least partly defined by the inner enveloping wall 204, the second element outer wall 212 and the third element outer wall 222. Furthermore, the intermediate space 230 has an access opening 232 at the first side 201A of the assembled frame arrangement 200, which access opening 232 in FIG. 2 is closed by a closing member 240, or a lid 240. The closing member 240 may be a single unit covering different portions of the intermediate space 230, or the closing member 240 may be comprised of different parts for covering the different portions of the intermediate space 230. In FIG. 2, the closing member 240 is sealingly connected to the first element 202 and the second element 210, and optionally to the third element 220, for example the closing member 240 may be welded at the first side 201A of the assembled frame arrangement 200 to the first element 202, the second element 210 and to the third element 220. By sealingly connecting the closing member 240 to the first element 202, the second element 210 and to the third element 220, the intermediate space 230 is sealed from the surroundings, possibly with the exception of a gas evacuating aperture as shown in FIG. 3.

(45) Depending on the size and dimension (or shape) of the second element 210 and the third element 220, and their respective arrangement in the interior volume 208, the closing member 240 may only be sealingly connected to the first element 202. For example, if the second element 210 and the third element 220 are solid blocks, the closing member may cover the first side of the assembled frame arrangement 200, and be sealingly connected around the circumference of the enveloping inner wall 204.

(46) In the intermediate space 230, a plurality of pieces of a wrought material 250 is arranged, of which only some pieces are shown for reasons of brevity. The plurality of pieces of a wrought material 250 has preferably been introduced into the intermediate space 230 by the access opening 232 prior to the application of the closing member 240. In FIG. 2, the pieces of a wrought material are embodied as plates 251 (or sheets or foils or rings or discs or ball bearing), wires 252 (or wire meshes, or rods or tubes or tube segments) and cubes 253 (e.g. forged cubes). It should be noted that different types of plurality of pieces of a wrought material 250 are shown here for exemplifying reasons, and typically, the same type of pieces of a wrought material 250 are provided in the intermediate space 230.

(47) According to at least one example embodiment, at least one of the plurality of pieces of a wrought material is a base plate 254, which e.g. may be arranged between the bottom wall 206 and the second element 210 and third element 220. Hereby, an increased stability of the assembled frame arrangement 200 and/or the formed metal based frame may be achieved.

(48) According to at least one example embodiment, at least one 255 of the plurality of pieces of a wrought material 250 has different material properties as compared to another one of the plurality of pieces of a wrought material 250. Moreover, such piece of a wrought material 255 may be arranged in the intermediate space 230 in a predetermined location, in order to provide specific portions of the formed metal based frame with certain characteristics, e.g. being harder by choosing the piece of a wrought material 255 to have relatively harder material properties.

(49) According to at least one example embodiment, a solid spacer 256 may be arranged in the intermediate space 230, the solid spacer not being part of the plurality of pieces of a wrought material 250. Such solid spacer 256 may later be machined away from the formed metal based frame. The solid spacer 256 may thus be used as a sacrifice, and may be referred to as a solid sacrificial spacer 256. For example, the solid spacer may be made out of a cheaper material compared to the plurality of pieces of a wrought material 250

(50) According to at least one example embodiment, the closing member 240 may be referred to as a first closing member 240, and the bottom wall 206 of the first element may be referred to as a second closing member 206, as it closes the interior volume at the second side 201B of the assembled frame arrangement 200. In other words, the second closing member 206 may be described as being arranged such that it covers a second access opening of the intermediate space 230, which second access opening is arranged opposite to the first access opening 232, wherein the second closing member 206 is sealingly connected to the inner enveloping wall 204 of the first element 202. Thus, the second closing member 206 may be described as being integrated with, or being in integral with the first element 202, or more specifically, the inner enveloping wall 204 of the first element 202, as compared to the first closing member 240 which is, prior to being sealed to at least the first element 202, provided separately from the first element 202.

(51) The assembled frame arrangement 200 in FIG. 2 may be subject to the operations of removing gas from the intermediate space 230 (see FIG. 3 below), and subjecting the assembled frame arrangement 200 to a hot pressing process (e.g. a HIPping process), i.e. a hot pressing process for a predetermined time at a predetermined pressure and a predetermined temperature. During the hot pressing process, metal based components, being in contact with each other, will metallurgically bond to each other. For the assembled frame arrangement 200, typically at least the plurality of pieces of a wrought material 250 will bond metallurgically to each other, to form a metal based frame, or at least a part or portion of the metal based frame (examples of metal based frame formed from an assembled frame arrangement according to the inventive concept are shown in FIGS. 4, 5a-5d, 6 and 7). However, as the first element 202, the second element 210, the third element 220 and the closing member 240 typically are metal-based, the first element 202, the second element 210, the third element 220, the closing member 240 and the plurality of pieces of a wrought material 250 will bond metallurgically to each other during the hot pressing process. According to at least one example embodiment, at least a portion of one of the first element 202, the second element 210, the third element 220 and the closing member 240 are removed from the metal based frame in order to reshape or resize the metal based frame.

(52) FIG. 3 shows a cross-section of the assembled frame arrangement 200 in a perpendicular view to that of FIG. 2, in a view direction from the first side 201A towards the second side 201B of the assembled frame arrangement 200. In FIG. 3, the closing member 240 is removed for increased visibility, but the closing member 240 typically covers the whole first side 201A of the assembled frame arrangement 200 except for the internal cavity 214 formed by the second element 210.

(53) Hence, prior to providing the closing arrangement 240 to the assembled frame arrangement 200, the interior volume 208, and the intermediate space 230 is opened to the surroundings (similar to what is shown in FIG. 3 with the closing member 240 removed). Hereby, the second element 210 and the third element 220 may be added to the interior volume 208, and subsequently, the plurality of pieces of a wrought material 250 may be added to the intermediate space 230.

(54) In FIG. 3, the bottom wall 206, and the cross-section of the inner enveloping wall 204, are rectangular, but another shape of the bottom wall 206, and the cross-section of the inner enveloping wall 204 is within the concept of the invention. However, according to at least one example embodiment, the shape of the bottom wall 206, and the cross-section of the inner enveloping wall 204 is similar or the same.

(55) In order to remove gas from the intermediate space 230, the assembled frame arrangement 200 of FIG. 2 or FIG. 3 may be provided with at least one gas evacuating aperture 260, as shown in FIG. 3. The gas evacuating aperture 260 is fluidly connected to the intermediate space 230. Moreover, a gas evacuating crimp tube 270 may be arranged to the assembled frame arrangement 200 such that an opening 272 of the gas evacuating crimp tube 270 covers the at least one gas evacuating aperture 260. Hereby gas can be removed from the intermediate space 230 by being evacuated from the intermediate space 230 via the at least one gas evacuating aperture 260 using the gas evacuating crimp tube 270.

(56) As an alternative to remove gas from the intermediate space 230 using the gas evacuating aperture 260 and optionally the gas evacuating crimp tube 270, is to remove gas by a providing a chemical substance 280 within the intermediate space 230, the chemical substance 280 being configured to react with the gas in the intermediate space 230 in order to remove the gas.

(57) As mentioned previously, the step of providing a chemical substance 280 within the intermediate space 230, may be followed by a step of heating the chemical substance 280 in order to make it react with the gas in the intermediate space 230 (if this is required for the chemical substance used). However, the step of heating the chemical substance 280 may be comprised in the step of subjecting the assembled frame arrangement 200 to a hot pressing process.

(58) FIG. 4 shows a metal based frame 300 formed by a hot pressing process of for example the assembled frame arrangement 200 of FIG. 2 and FIG. 3, but where the third element 220 formed as a block has been removed subsequent to the hot pressing process step. Alternatively, the metal based frame 300 of FIG. 4 may be formed by an assembled frame arrangement 200 of FIG. 2 and FIG. 3 but with the exception of providing the third element 220 as a canister, similar to the second element 210.

(59) The metal based frame 300 comprises a first side 301A corresponding to the first side 201A of the assembled frame arrangement 200, a second side 301B arranged opposite to the first side 301A, the second side 301B of the metal based frame 300 corresponding to the second side 201B of the assembled frame arrangement 200. Furthermore, the metal based frame 300 comprises a lateral side 301C extending from the first side 301A to the second side 301B.The frame 300 has a length L, height H and width W and thus the volume of the outer dimensions of the frame 300 is W×L×H. The metal based frame 300 has a volume of metal that may be calculated by calculating the that a solid component having the same outer dimensions would have and subtract the volume of the cavities.

(60) As shown in FIG. 4, the metal based frame 300 comprises a frame arrangement 302 having an outer metal based border 304 defined by at least the lateral side 301C of the metal based frame 300, and an inner metal based member 306 separating at least two cavities, i.e. a first cavity 314 and a second cavity 316 forming at least a part of the frame arrangement 302. Each cavity 314 and 316 has a length l, height h and width w, and thus a volume of w×l×h. Preferably, both cavities have the same dimensions. Thus, the metal volume of the frame can be calculated as W×L×H−(2(w×l×h).

(61) At least a portion of the inner metal based member 306 comprises, or is made by, a plurality of pieces of a wrought material which have been metallurgically bonded to each other during a hot pressing process (e.g. HIPping), i.e. the process of a hot pressing for a predetermined time at a predetermined pressure and a predetermined temperature. Moreover, the shape of the outer metal based border 304 may e.g. be defined by the first element 202 used as an outer element during the hot pressing process.

(62) The first cavity 314 typically corresponds to the internal cavity 214 of the second element 210 of the assembled frame arrangement 200, and the second cavity 316 corresponds to removed third element 220, or of an internal cavity of the third element 220 for embodiments in which the third element 220 is shaped as a canister. According to at least one example embodiment, the at least two cavities 314, 316 are partitioned from each other by at least a portion the inner metal based member 306 such that a predetermined pattern of the inner metal based member 306 is formed inside of the outer metal based border 304. The predetermined pattern of the inner metal based member 306 may typically correspond to the predetermined pattern of the intermediate space 230 of the assembled frame arrangement 200 of FIG. 2 or FIG. 3. More specifically, the predetermined pattern of the inner metal based member 306 may be defined by the second element 210 and the third element 220, and their arrangement in the interior volume 208 of the assembled frame arrangement 200 for forming the intermediate space 230 in the predetermined pattern. As mentioned previously, the third element 220 may have been removed subsequently to the hot pressing process in order to form the second cavity 316.

(63) FIGS. 5a, 5b, 5c and 5d show different embodiments of metal based frames 500, 600, 700, 800 formed by a hot pressing process of an assembled frame arrangement with corresponding structures as the assembled frame arrangement 200 in FIG. 2 and FIG. 3, but where certain portions or elements have been added or have been removed, or simply where a certain element has been re-shaped to correspond to a desired shape of the metal based frame.

(64) In FIG. 5a, the metal based frame 500 comprises a first side 501A corresponding to the first side 201A of the assembled frame arrangement 200, a second side 501B arranged opposite to the first side 501A, the second side 501B of the metal based frame 500 corresponding to the second side 201B of the assembled frame arrangement 200. Furthermore, the metal based frame 501 comprises a lateral side 501C extending from the first side 501A to the second side 501B. Similar to FIG. 4, the metal based frame 500 of FIG. 5a comprises a frame arrangement 502 having an outer metal based border 504 defining at least the lateral side 501C of the metal based frame 500, and an inner metal based member 506 separating at least two cavities, in FIG. 5a separating three cavities 514, 516, 518, forming at least a part of the frame arrangement 502. Moreover, at least a portion of the inner metal based member 506 comprises, or is made by, a plurality of pieces of a wrought material which have been metallurgically bonded to each other during a hot pressing process.

(65) Furthermore, in FIG. 5a, the three cavities 514, 516, 518 typically correspond to respective internal cavities of elements used as inner elements, e.g. inner canisters prior to the hot pressing process (as e.g. the first element 210 of the assembled frame arrangement 200 in FIG. 2 and FIG. 3, which are not described in detail here again). Separating the three cavities 514, 516, 518, in a circumferential direction of the metal based frame 500, are except for portions of the inner metal based member 506, also three solid blocks 520, 522, 524, wherein each solid block 520, 522, 524 is arranged between two of the three cavities 514, 516, 518. The three solid blocks 522, 524, 526 typically corresponding to respective elements used as inner elements, e.g. inner blocks prior to the hot pressing process (as e.g. the second element 220 of the assembled frame arrangement 200 in FIG. 2 and FIG. 3, which are not described in detail here again). Moreover, the shape of the outer metal based border 504 may e.g. be defined by a corresponding outer element, e.g. an outer canister prior to the hot pressing process (as e.g. the first element 202 of the assembled frame arrangement 200 in FIG. 2 and FIG. 3, which are not described here again). Also, a predetermined pattern of the inner metal based member 506 typically correspond to a predetermined pattern of an intermediate space prior to the hot pressing process (in principle the same as the intermediate space 230 of the assembled frame arrangement 200 of FIG. 2 or FIG. 3).

(66) FIG. 5b, FIG. 5c and FIG. 5d show a respective perspective view of different metal based frame 600, 700, 800. In general, each one of the metal based frames 600, 700, 800 is formed from an assembled frame arrangement with corresponding structures as the assembled frame arrangement 200 in FIG. 2 and FIG. 3, but in FIG. 5b, the metal based frame 600 has a cross section formed as a circular segment with corresponding frame arrangement 602 having an outer metal based border 604 and an inner metal based member 606 separating at least two cavities 614, 616. In FIG. 5c, the metal based frame 700 has a cross section formed as a triangular segment with corresponding frame arrangement 702 having an outer metal based border 704 and an inner metal based member 706 separating at least five cavities 714-718. In FIG. 5d, the metal based frame 800 has a corresponding frame arrangement 802 with an outer metal based border 804 and an inner metal based member 806 separating at least five cavities 814-818 as the metal based frame 700 of FIG. 5c, but where the metal based border 804 at one of its sides are wave-shaped.

(67) FIG. 6 shows a cross section of a metal based frame 900 according to at least one example embodiment of the inventive concept. The metal based frame 900 is formed by a hot pressing process of an assembled frame arrangement with corresponding structures as the assembled frame arrangement 200 in FIG. 2 and FIG. 3, but where a base plate 954 separate two frame arrangements 902, 903, each frame arrangement 902, 903 comprises a respective outer metal based border 904, 905 and a respective inner metal based member 906, 907 separating at least two respective pair of cavities 914, 915, 916, 917.

(68) FIG. 7 shows a cross section of a metal based frame 1000 according to at least one example embodiment of the inventive concept. The metal based frame 100 is formed by a hot pressing process of an assembled frame arrangement with corresponding structures as the assembled frame arrangement 200 in FIG. 2 and FIG. 3, as e.g. the metal based frame 900 of FIG. 6, i.e. with a corresponding frame arrangement 1002 having an outer metal based border 1004 and an inner metal based member 1006 separating at least two cavities 1014, 1016.

(69) Hence, for all the metal based frames 500-1000, at least a portion of the respective inner metal based member 506, 606, 706, 806, 906, 907, 1006 comprises, or is made by, a plurality of pieces of a wrought material which have been metallurgically bonded to each other during a hot pressing process (e.g. a HIPping process), i.e. the process of a hot pressing for a predetermined time at a predetermined pressure and a predetermined temperature).

(70) FIG. 8 shows a micrograph of a trace 1100, e.g. a metallurgical detectable trace, of the interface between two different pieces in the plurality of pieces of a wrought material 250, which trace is visible in the metal based compound after it is manufactured. In the micrograph, the line 1102, along which line a crystallographic mismatch of metal grains 1106 is clearly visible. Thus, the traces are formed by crystallographic mismatch at interfaces between different pieces in the plurality of pieces of a wrought material.

(71) FIG. 9a shows a perspective top view of an embodiment of a metal based frame 1200 formed by a hot pressing process of an assembled frame arrangement with corresponding structures as the assembled frame arrangement 200 in FIG. 2 and FIG. 3. The embodiment corresponds to the embodiment shown in FIG. 4, but herein, the cavities 1214 are through holes extending through the metal frame. The frame 1200 is shown with a plurality of through holes 1214. The frame 1200 has a curved shape. The ratio, by volume, of metal:cavity in the frame can be calculated in a manner akin to as described in relation to FIG. 4. The metal volume may be calculated by calculating or measuring the volume a solid component having the same outer components would have and subtracting the total volume of the cavities. In this example however, it should be noted that the frame is curved and may not have a uniform height.

(72) FIG. 9b shows the frame 1200 of FIG. 9a in a view perspective view showing the underside of the frame. The frame comprises cavities 1214 in the form of through-holes.