Miniaturized deburring and/or chamfering tool with internal cooling

Abstract

Miniaturized deburring and/or chamfering tool with a cylindrical guide sleeve (2) in which a blade holder base body (5) is arranged in an exchangeable manner, which has at least one receiving slot (20) for receiving and guiding a blade (6) arranged there, which is leaf-shaped and designed so that it can bend along its longitudinal axis, and which, at its free front end, has a cutting head (7) with a deburring or chamfering blade arranged there, wherein an internal cooling of the blade (6) and removal of shavings from the blade (6) are achieved by the fact that the coolant flows around the blade (6) in the receiving slot (20) on at least two facing sides.

Claims

1. Miniaturized deburring and/or chamfering tool with a cylindrical guide sleeve in which a blade holder base body is arranged in an exchangeable manner, which has at least one receiving slot for receiving and guiding a blade arranged there, which is leaf-shaped and designed so that it can bend along its longitudinal axis, and which, at its free front end, has a cutting head with a deburring or chamfering blade arranged there, the leaf-shaped blade configured to permit movement of the cutting head generally radially relative to a longitudinal axis of the tool out of the slot to an extended deburring/chamfering position and into the slot to a retracted non-deburring/chamfering position, wherein an internal cooling of the blade and removal of shavings from the blade are achieved by coolant flowing around the blade in the receiving slot on at least two facing sides.

2. Deburring or chamfering tool according to claim 1, wherein coolant flows at least partially around and/or through the blade holder base body of the tool, which receives the deburring or chamfering blade, in a longitudinal direction and on its outer periphery, in that the deburring or chamfering blade is designed as leaf-shaped and is received bendably in the at least half-open receiving slot of the blade holder base body, and in that the coolant is streamed through the receiving slot.

3. Deburring or chamfering tool according to claim 1 or 2, wherein a coolant sleeve for guiding the coolant is provided, which encloses a front tool portion like a sleeve.

4. Deburring or chamfering tool according to claim 3, wherein the coolant sleeve is designed at a front passage opening thereof so that both a coolant flow directed in an axial direction and also a coolant flow directed in a radial direction are expelled.

5. Deburring or chamfering tool according to claim 4, wherein the coolant flow exiting the passage opening of the coolant sleeve in the axial direction is directed against a bore to be machined.

6. Deburring or chamfering tool according to claim 5, wherein the coolant also flows around the blade holder base body in the axial direction on all four sides over an entire periphery thereof.

7. Deburring or chamfering tool according to claim 3, wherein the coolant sleeve is attached detachably to a neck of the guide sleeve of the tool.

8. Deburring or chamfering tool according to claim 7, wherein the coolant sleeve encloses the blade holder base body at least on the tip side and forms only a front, end-side passage opening for the outlet of the coolant.

9. Deburring or chamfering tool according to claim 1, wherein the coolant is led in an axial direction through a central coolant channel forward, against a rear end side of the blade holder base body, and there it can be divided into two coolant flows separated from one another, wherein one coolant flow flows into a longitudinal channel, which is formed by a flat portion on the blade holder base body and a facing surface of the guide sleeve.

10. Deburring or chamfering tool according to claim 9, wherein the other coolant flow is introduced in an axial direction into a start of the receiving slot in which the leaf-shaped blade is movably mounted.

11. Deburring or chamfering tool according to claim 1, wherein the blade holder base body has two blades therein, the respective cutting heads of which are diametrically opposed.

12. Deburring or chamfering tool according to claim 1, wherein the blade includes a notch therein and the base body includes a cross bolt therein, the notch receiving the cross bolt to secure the blade against axial displacement.

Description

(1) The invention is explained in further detail below in reference to drawings representing several ways of carrying it out. Here additional features essential to the invention and advantages of the invention are apparent from the drawings and their description.

(2) FIG. 1 shows: a perspective view of an embodiment of a deburring blade according to the invention

(3) FIG. 2 shows: an exploded type breakdown of the tool according to FIG. 1

(4) FIG. 3 shows: a section in a first plane of the deburring tool according to FIGS. 1 and 2

(5) FIG. 4 shows: an enlarged detail representation of the cutting head of the tool according to FIG. 3

(6) FIG. 5 shows: a cross section offset by 90 through the tool

(7) FIG. 5a shows: the guidance of the coolant in a simplified representation

(8) FIG. 6 shows: a cross section along line VI-VI in FIG. 4

(9) FIG. 7 shows: a cross section along line VII-VII in FIG. 3

(10) FIG. 8 shows: a perspective view of a deburring blade

(11) FIG. 9 shows: the enlarged detail view of the cutting head of the deburring blade according to FIG. 8

(12) FIG. 10 shows: a diagrammatic representation of another tool for deburring with guidance of the coolant

(13) In FIG. 1, in a perspective representation, a first embodiment of a tool 1 is represented, which consists substantially of an approximately round cylindrical guide sleeve 2, on the front end of which a coolant sleeve 10 is arranged, which transitions into a cylindrical neck 11 of reduced diameter.

(14) From the front cylindrical neck 11, the cutting head 7 of the tool 1 protrudes, wherein, in the depicted embodiment, it is still visible that the base body 5 which receives the blade 6 ends in a tip 36, and the coolant flows out of a passage opening 8 arranged at the front end of the neck 11 in axial arrow direction 9 and also in radial direction, and flows through the cutting head 7 with the cutting edges arranged there, keeping it free of shavings and soiling.

(15) It is important that the coolant flows not only over the blade 6, but also through the receiving slot 20 (keyword internal cooling) in which the blade 6 is received.

(16) This will also be discussed further in the later drawings.

(17) It should also be noted that the base body 5 is held with the assistance of a tensioning screw 4, which is screwed into a bore 3 in the guide sleeve 2.

(18) FIG. 2 shows an exploded type breakdown of the tool 1 according to FIG. 1.

(19) There, one can see that, in the embodiment example, at the rear end side, the cylindrical guide sleeve 2 has a coolant inlet 17 into which the coolant is led under pressure in arrow direction 18. The invention is not limited to this.

(20) In another embodiment, it is possible to provide that the coolant inlet occurs radially on the outer periphery of the guide sleeve 2 or directly on the coolant sleeve 10 or also in other areas, in particular the cylindrical neck 12 of the guide sleeve 2.

(21) In the depicted embodiment example, one can see, furthermore, that, in the guide sleeve 2, a stop 16 in the form of a transverse bolt is present, so that the base body 5 which receives the deburring blade 6 abuts rearward in axial direction towards the rear.

(22) The coolant channel 19 is preferably arranged in the center of the cylindrical guide sleeve 2. The invention is not limited to this. In addition to the central coolant channel 19 guided in axial direction, it is also possible to provide individual lengthwise bores, ribs or other half-open or closed guide channels for the coolant in direction towards the front end of the guide sleeve 2.

(23) The blade holder base body 5 which receives the blade 6 is also substantially of round cylindrical design and it has a rear attachment neck 14 with which the base body abuts in axial direction rearward against the stop 16.

(24) The attachment neck 14 of larger diameter is adjoined by an annular groove 15 of smaller diameter, in which the tensioning screw 4 engages and thus it attaches the base body 5 exchangeably in axial direction in the guide sleeve 2.

(25) The annular groove 15 of reduced diameter is adjoined by a portion of the base body 5 of a larger diameter, in whose surface a first portion of a receiving slot 20a is provided, which extends from the back through the entire longitudinal extent of the base body 5 forward in the form of the axially extending receiving slots 20b, 20c.

(26) The receiving slot 20 has three subdivisions 20a, 20b, 20c which extend one after the other in axial direction and transition into one another, and which are connected in a fluid conducting manner to one another, and, it continues to the front into the part 25 of reduced diameter which transitions via a conical neck into a part 24 of enlarged diameter, which adjoins in axial direction.

(27) Transversely to the longitudinal extent of the blade holder base body 5, a transverse bolt 26 is arranged, on which the blade 6 having an indentation 21 engages and is securely held axially there against shifting.

(28) In the depicted embodiment example, the blade 6 consists of a leaf-shaped metal part, which is made of a spring material and which consists of a larger rear leaf body 22 in whose area the indentation 21 is arranged.

(29) The leaf body, which has an approximately rectangular cross section and a relative small design, transitions forward into a flexible blade neck 23 of reduced width which adjoins at the front, wherein the cutting head 7 is arranged at the free front end of the blade neck 23.

(30) An enlarged representation of this blade is shown in FIGS. 8 and 9. There, the special geometry of the cutting head is also represented. One can see that the cutting head 7 is formed by a cutting edge 46 which extends at a slant in a first plane and which is adjoined in a second plane by a free surface 47, and the cutting edge 46 in turn transitions into a cutting surface 48 in a third plane.

(31) Thus, the cutting head 7 is suitable for deburring in a certain direction of rotation of the tool, wherein the direction of rotation of the tool is clockwise in the depicted embodiment example.

(32) This relates to a rearward cutting of the cutting head, which depends on the position of the cutting edge 46.

(33) In another embodiment which is not represented in a drawing, it is provided that a forward cutting occurs by means of a cutting edge 46 in different design.

(34) In the same way, the invention is not limited to the arrangement of a single blade 6 as flat blade. Multiple blades can also be arranged in a common base body, in particular two diametrically facing blades 5 in the design in the form of a flat blade.

(35) The base body 5 is also received in the cylindrical accommodation 13 of the guide sleeve 2 and is secured by means of the tensioning screw 4.

(36) Now, it is important that the coolant flowing in arrow direction 18 flows through the cylindrical neck 12 in the guide sleeve 2 and over a first flat portion 40 into the round-cylindrical neck 14 of the blade holder base body 5, which is received therein with little radial play.

(37) On the outer periphery of the blade holder base body 5, a second flat portion 40 is provided, which reduces the diameter in this area and which adjoins the first flat portion 40 in axial alignment in axial direction, so that the coolant flow flows laterally past the blade holder base body 5 and over a conical neck 51 of reduced diameter, which adjoins the second flat portion 40 in axial direction.

(38) The conical neck 51 of decreased diameter forms the outer periphery of the blade holder base body 5 in this area and it transitions coaxially into a cylindrical neck 24, where the coolant reaches a peripherally extending annular space 31 and is distributed there around the entire periphery of the base body 5. The annular space 31 is formed by the inner periphery of a coolant sleeve 10 and the outer periphery of the cylindrical part 24 of the blade holder base body 5.

(39) In order to guide the coolant and to ensure that the coolant does not flow outward in radial direction, a coolant sleeve 10 is provided, which is screwed with an associated receiving thread onto an associated threaded neck on the neck 12 of the guide sleeve 2. Instead of a screw connection, a plug connection or bayonet connection can also be selected.

(40) The coolant sleeve 10 thus completely encloses the base body 5 with the blades 6 held in the receiving slot 20 and it forms only a front, end-side passage opening 8 for the outlet of the coolant.

(41) The coolant sleeve 10 consists substantially of a round cylindrical part, which is made of aluminum, plastic or another suitable material. Starting with a larger diameter, it transitions via a first conical neck 28 into a smaller neck 11, which in turn transitions via an additional conical neck 29 into the front flat side in which the passage opening 8 is arranged.

(42) FIG. 3 shows a first cross-sectional plane through the tool 1, where one can see that the coolant channel 19 and the coolant guided there in arrow direction 18 flows over the stop 16 and reaches the area of the neck 14 of the base body 5, wherein it is not shown in further detail how the coolant flows past the lower portion of the base body 5. This can only be seen in FIG. 5.

(43) In arrow direction 32 drawn in broken lines, it is shown that the coolant flows along in axial direction in the base body 5 in the receiving slot 20, but also from outside around the base body, so that both an internal and also an external peripheral flow with coolant is provided.

(44) The flow through the receiving slot 20 is explained below in greater detail in reference to FIG. 5.

(45) From FIG. 3, one can see that the outer periphery of the base body 5 is also exposed to flow around it in the area of the flow channels 33 which appear, in longitudinal direction, as a gap between the inner periphery of the coolant sleeve 10 and the outer periphery of the base body 5.

(46) It is only for the sake of completeness that it is also shown that the blade 6 does not abut with its rear axial end against the base body 5, but that it encounters instead a free space 30 there, so that the blade 5 is received almost completely in the receiving slot 20 of the base body 5 and swivels there at an angle relative to the axial longitudinal extent. According to the invention, the coolant flows through this receiving slot 20, and as a result prevents the penetration of shavings, which would have a negative effect on the swivel path of the blade 6.

(47) The spring action of the blade 6 for deburring bores or for chamfering bores occurs in the area of the blade neck 23 which has a flexible design and swivels in the receiving slot 20. In the mechanical equivalent diagram, it is represented as a bending beam clamped in on one side.

(48) Accordingly, the cutting head 7 can swivel in radial direction 52 into the receiving slot 20c on the front tip 36 of the base body 5, or it is held, spring loaded, in the deburring or contact position shown in FIG. 3, and is thus moved with its cutting head 7 radially outward so that it protrudes over the tip 36.

(49) FIG. 3 moreover shows, also diagrammatically, a workpiece 34 with a bore 35, through which the cutting head 7 can be moved, wherein the bore 35 is deburred or chamfered in the rearward movement on the bore margin.

(50) FIG. 4 shows, in an enlarged representation, the detail according to FIG. 3 with the coolant guidance in the area of the cutting head. There, one can see that the channel 33 narrows conically in the forward direction and forms a passage opening 8b, wherein one passage opening 8b is at the top and the other passage opening 8a is at the bottom. The design of the different passage openings 8a, 8b depends on the springiness of the blade neck 23.

(51) If the blade neck 23 springs upward, then the upper passage opening 8a is open and the lower passage opening 8b is substantially closed.

(52) On the other hand, if the blade neck 23 springs downward in arrow direction 52, then the lower passage opening 8b opens and the upper passage opening 8a closes.

(53) It is also indicated that the passage openings 8a, 8b themselves are connected to one another on the periphery, resulting in an approximately oval shaping.

(54) The flow channel 33 leads in a forward direction into the passage openings 8a, 8b, which are connected to one another on the periphery in a continuous and fluid conducting manner, so that at first a first coolant jet exits in arrow direction 38 from the passage openings 8a, 8b and then flows over the rear portion of the blade neck 23 keeping it free of shavings.

(55) In this manner, in this area, the entire receiving slot 20, by means of which the blade neck 23 sits on the base body 5, is rinsed free, so that no shavings can collect there. The arrow direction 38 is located behind the workpiece bore 35.

(56) However, the coolant jet continues in arrow direction 42 and flows through a longitudinal channel 41 formed by the outer periphery of the blade 6 and the receiving slot 20c in the base body 5.

(57) Thus, the coolant jet also flows out directly at the front in the gap between the cutting head 7 and the tip 36 of the base body, in particular in the arrow direction 39 drawn there, at a slant forward in radial and also in axial direction. In this manner, it is ensured that, in this area, no shavings and no soiling can be deposited, because there is a fluid conducting connection of the coolant up to the tip 36 of the base body 5, wherein the coolant flows along both over the base body 5 at its outer periphery and also in the inner area over the receiving slot 20, 20a, 20b, 20c, resulting in an internal cooling according to the invention.

(58) In FIG. 5, a cross section offset by 90 in comparison to FIG. 3 is represented, in which the coolant guidance can be seen. The coolant, which flows in arrow direction 18 around the blade holder base body 5, flows forward over a flat portion 40 of the blade holder base body 5 at the outer periphery of the blade holder base body 5, and it arrives over the one longitudinal channel 41 which is formed by the flat portion 40 and the inner periphery of the guide sleeve 2. The coolant flows forward until it reaches the peripherally extending annular space 31, where the coolant is distributed over the entire periphery of the blade holder base body 5 and thus also penetrates into the receiving slot 20.

(59) Thus, from the annular space 31 on, the receiving slot 20b and the fluid-conducting receiving slot 20c adjoining it for the movable accommodation of the blade 6 are rinsed in axial direction.

(60) It is also shown that the coolant flows out behind the bore in arrow direction 38 and also in front of the bore in arrow direction 39.

(61) Since the coolant outflow behind the bore depends on the springiness of the cutting head 7, the arrow direction 38 was differentiated from the arrow direction 37, since the coolant exits in different quantities in these areas depending on the time.

(62) Leaving off the body edges of the tool, FIG. 5a shows only the coolant guidance in a highly simplified form. The coolant is thus led forward in axial arrow direction 18 through the central coolant channel 19, against the rear end side of the blade holder base body 5. There, the coolant flow is divided into two coolant flows separated from one another, wherein a lower coolant flow flows into the longitudinal channel 41 which is formed by the flat portion 40 on the blade holder base body 5 and the facing surface of the guide sleeve 2.

(63) The other portion of the coolant flows further into the receiving slot 20 in arrow direction 18, namely into the beginning of the receiving slot 20a in which the leaf-shaped blade 6 is movably mounted. The movement of the plate-shaped blades results from its bendability. There is no swiveling about a mounting shaft.

(64) The coolant flow in the receiving slot 20 thus flows through all the parts 20a, 20b, 20c, which are connected together in an aligning and fluid conducting manner, of the receiving slot 20 in the blade holder base body 5, so that the bendable mounted blade 6 is exposed to peripheral flow from all four sides.

(65) The front part 20c of the receiving slot 20 ends after the cutting head 7 of the blade 6, so that the front part 20c extends beyond the cutting head 7 and the coolant also flows in axial direction in front of the cutting head 7 out of the receiving slot 20c in arrow direction 39.

(66) FIG. 5 also shows the path of the coolant flow which flows radially outward through the longitudinal channel 41 and leads into a peripherally extending annular space 31, and which flows in axial direction forward out through the longitudinal channels 33 which are formed by the outer periphery of the blade holder base body 5 and the inner periphery of the coolant sleeve 10. Thus, the coolant is guided forward at the outer periphery of the blade holder base body 5 in the peripherally extending flow channel 33 in the direction towards the outflow end, where it flows out of the coolant sleeve 10 in the arrow direction 37, 38 in front of the cutting head 7 of the blade 6.

(67) FIG. 6 shows a cross section in the direction of the arrow VI-VI in FIG. 4 through the cutting head, where one can see that flow cross sections 20c are present due to the flattening of the blade neck 23 behind the cutting head 7. To simplify the drawing, the front view of the coolant sleeve 10 is not shown in the plane of the drawing of FIG. 6.

(68) Furthermore, one can see that the coolant, next to the large-surface flow cross sections, drawn at 8b, flows out in arrow direction 42a, 42b perpendicularly to the plane of the drawing.

(69) It is also shown that, in the lateral areas, where the mounting and movement guidance of the blade 6 occurs, additional passage cross sections 43 are present, through which coolant flows as well. Thus, the guiding surfaces for guiding the blade 6 are also rinsed in axial direction.

(70) In a refinement of the invention, it is possible to provide that, in the blade holder base body 5, in the direction of the passage cross section 43, which is designed to be relatively small for the guidance of the blade 6, additional longitudinal ribs 45 can also be provided for the guidance of the flow of the coolant.

(71) In addition to these longitudinal ribs 45 or instead of the longitudinal ribs 45, it is also possible to provide, in another embodiment, that in the blade 6 itself, and namely in the area of the blade neck 23, longitudinal ribs 44 that are open towards the outside are also arranged, which can be complementary with the base body-side longitudinal ribs 45 or are arranged separately.

(72) The depicted features with reference numerals 43, 44, 45 are only represented in broken lines, since they may be present in an optional form. However, they can also be omitted.

(73) FIG. 7 shows a cross section along line VII-VII in FIG. 3, where, a cut is made through the neck of the coolant sleeve 10 on the guide sleeve 2. The guidance of the coolant along the blade holder base body 5 will be explained once more.

(74) One can see that the blade holder base body 5 can have a flat portion 40, so that the coolant flows along in the longitudinal channel 41 formed thereby. The longitudinal channel is formed by the outer periphery of the flattened portion of the base body 5 and the inner periphery of the guide sleeve 2.

(75) Instead of or in addition to providing one or more flat portions 40 on the outer periphery of the blade holder base body 5, the other features described below can also be provided.

(76) It is only represented in broken lines that, on the outer periphery of the blade holder base body 5, additional longitudinal channels 50 which are completely continuous in longitudinal direction can be provided, or that, instead of the longitudinal channels 50, one or more longitudinal channels 49 are arranged on the inner periphery of the guide sleeve 2.

(77) It is also possible to provide, in another representation, that the longitudinal channels 49, 50 face one another thus forming the largest possible passage cross section for the coolant.

(78) Likewise, it is possible to provide that the longitudinal channels 49, 50 are arranged evenly distributed over the periphery.

(79) FIG. 9 shows, in an enlarged representation, a preferred embodiment of a blade, as already explained in reference to FIG. 2.

(80) In FIG. 9, the cutting head 7 is represented enlarged, where one can see that the cutting surface 46 is arranged extending at a slant and that it is mounted above a free surface 47.

(81) The cutting surface 48 adjoins the free surface 47 at an angle.

(82) In FIG. 10, identical parts and functions are provided with the same reference numerals.

(83) FIG. 10 shows, as additional embodiment example, another tool for deburring and for introducing chamfers, in which the rotatably mounted blade 54 is pushed or pulled in radial direction in or out of a cylindrically shaped blade holder 55. This occurs due to the force of a flexible spring 53 and the guiding of the flexible spring 53 in a longitudinal channel 56 in the blade holder 55. The coolant 57 is guided in arrow direction 58 onto the blade window 59 in the longitudinal channel 56. Along the cross section line VI-VI in FIG. 10, this results in the same flow geometry as described above in reference to FIG. 6. The coolant channel 19 is designed as a double channel and the two channels are guided so that they face one another radially outward from the central bore. In the central bore, the guidance of the flexible spring 53 is arranged.

(84) Thus, it is clear from the embodiment example of FIGS. 3 and 10, that the invention is not limited to a miniaturized deburring tool with a leaf-shaped blade whose cutting head is movably pretensioned via a flexible blade neck, but that the invention instead also relates to other deburring and chamfering tools with larger outer diameter each allowing a guidance of the coolant in the guide sleeve in the direction of the blade window.

LEGEND FOR THE DRAWINGS

(85) 1 Tool

(86) 2 Guide sleeve

(87) 3 Bore

(88) 4 Tensioning screw

(89) 5 (Blade holder) base body

(90) 6 Blade

(91) 7 Cutting head

(92) 8 Passage opening a, b

(93) 9 Arrow direction

(94) 10 Coolant sleeve

(95) 11 Neck (of 10)

(96) 12 Neck (of 2)

(97) 13 Accommodation

(98) 14 Securing neck (of 5)

(99) 15 Annular groove

(100) 16 Stop

(101) 17 Coolant inlet

(102) 18 Arrow direction

(103) 19 Coolant channel

(104) 20 Receiving slot a, b, c

(105) 21 Indentation

(106) 22 Leaf body

(107) 23 Blade neck

(108) 24 Part (of 5)

(109) 25 Part (of 5)

(110) 26 Transverse bolt

(111) 27 Receiving thread (of 10)

(112) 28 Cone (of 10)

(113) 29 Conical neck

(114) 30 Free space

(115) 31 Annular space

(116) 32 Arrow direction

(117) 33 Flow channel

(118) 34 Workpiece

(119) 35 Bore

(120) 36 Tip (of 5)

(121) 37 Arrow direction

(122) 38 Arrow direction

(123) 39 Arrow direction

(124) 40 Flat portion

(125) 41 Longitudinal channel

(126) 42 Arrow direction a, b

(127) 43 Passage cross section

(128) 44 Longitudinal rib (of 6)

(129) 45 Longitudinal rib (of 5)

(130) 46 Cutting edge

(131) 47 Free surface

(132) 48 Cutting surface

(133) 49 Longitudinal channel (in 2)

(134) 50 Longitudinal channel (in 5)

(135) 51 Conical neck

(136) 52 Arrow direction

(137) 53 Flexible spring

(138) 54 Blade

(139) 55 Blade holder

(140) 56 Longitudinal channel

(141) 57 Coolant

(142) 58 Arrow direction

(143) 59 Blade window