METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF A COMPONENT

Abstract

A method for the powder metallurgical production of a component may include providing a mould, filling a first metallurgical powder into the mould such that an outer contact surface of the first metallurgical powder in the mould forms an angle of 55° to 65° with an axis of a future green product, and filling a second metallurgical powder that is distinct from the first metallurgical powder into the mould such that the second metallurgical powder adjoins the outer contact surface of the first metallurgical powder. The method may also include producing the green product out of the first metallurgical powder and the second metallurgical powder, and sintering the green product to produce the component.

Claims

1. A method for the powder metallurgical production of a component, comprising: providing a mould; filling a first metallurgical powder into the mould such that an outer contact surface of the first metallurgical powder in the mould forms an angle of 55° to 65° with an axis of a future green product; filling a second metallurgical powder that is distinct from the first metallurgical powder into the mould such that the second metallurgical powder adjoins the outer contact surface of the first metallurgical powder; producing the green product out of the first metallurgical powder and the second metallurgical powder; and sintering the green product to produce the component.

2. The method according to claim 1, wherein the component is rotation-symmetrical with respect to the axis.

3. The method according to claim 1, wherein the component is produced such that the sintered second metallurgical powder forms an outside of the component and at least partly covers the sintered first metallurgical powder.

4. The method according to claim 1, wherein the angle formed by the contact surface and the axis is 58° to 62°.

5. The method according to claim 1, wherein the sintered second metallurgical powder has a higher wear resistance than the sintered first metallurgical powder.

6. The method according to claim 1, wherein: the component is a tribologically loaded component; and the sintered second metallurgical powder of the component is tribologically exposed and is carried by the sintered first metallurgical powder.

7. The method according to claim 1, wherein sintering the green product includes infiltrating the green product with at least one of copper and a copper alloy with a content of at least 70% by weight of copper.

8. The method according to claim 1, wherein the first metallurgical powder has a composition including: 0.3 to 1.8% by weight of carbon (C); 0 to 1.8% by weight of silicon (Si); 0 to 1.0% by weight of sulfur (S); 0 to 1.0% by weight of manganese (Mn); 0 to 15.0% by weight of chromium (Cr); 0 to 2.5% by weight of molybdenum (Mo); 5 to 48% by weight of copper (Cu); 0 to 3.5% by weight of nickel (Ni); 0 to 5.5% by weight of tungsten (W); 0 to 2.0% by weight of vanadium (V); and a remainder of iron (Fe) and production-related contaminations.

9. The method according to claim 1, wherein the second metallurgical powder has a composition including: 0.7 to 1.8% by weight of carbon (C); 0 to 1.8% by weight of silicon (Si); 0 to 1.0% by weight of manganese (Mn); 0 to 0.5% by weight of sulfur (S); 2.0 to 15.0% by weight of chromium (Cr); 2.5 to 18.0% by weight of molybdenum (Mo); 0.4 to 2.0% by weight of vanadium (V); 10.0 to 20.0% by weight of copper (Cu); 0.8 to 4.0% by weight of tungsten (W); 0 to 12.0% by weight of cobalt (Co); 0 to 3.5% by weight of nickel (Ni); and a remainder of iron (Fe) and production-related contaminations.

10. An arrangement, comprising: a component produced in accordance with the method of claim 1; a structural body based on at least one of iron and nickel; and wherein an outside of the component formed by the sintered second metallurgical powder is in tribological contact with the structural body.

11. A method for the powder metallurgical production of a component, comprising: producing a green product from a first metallurgical powder and a second metallurgical powder that is distinct from the first metallurgical powder; sintering the green product; and wherein producing the green product includes: providing a mould; filling the mould with the first metallurgical powder such that an outer contact surface of the first metallurgical powder in the mould defines an angle of 55° to 65° with an axis of the green product; and filling the mould with the second metallurgical powder such that the second metallurgical powder adjoins the outer contact surface of the first metallurgical powder.

12. The method according to claim 11, wherein producing the green product further includes at least partially covering the first metallurgical powder with the second metallurgical powder such that an outside of the component is formed by the sintered second metallurgical powder.

13. The method according to claim 12, wherein: the component is a tribologically loaded component; and the sintered second metallurgical powder of the component is tribologically exposed and is carried by the sintered first metallurgical powder.

14. The method according to claim 11, wherein sintering the green product includes infiltrating the green product with at least one of copper and a copper alloy with a content of at least 70% by weight of copper.

15. The method according to claim 14, wherein the first metallurgical powder has a composition including: 0.3 to 1.8% by weight of carbon (C); 0 to 1.8% by weight of silicon (Si); 0 to 1.0% by weight of sulfur (S); 0 to 1.0% by weight of manganese (Mn); 0 to 15.0% by weight of chromium (Cr); 0 to 2.5% by weight of molybdenum (Mo); 5 to 48% by weight of copper (Cu); 0 to 3.5% by weight of nickel (Ni); 0 to 5.5% by weight of tungsten (W); 0 to 2.0% by weight of vanadium (V); and a remainder of iron (Fe) and production-related contaminations.

16. The method according to claim 15, wherein the second metallurgical powder has a composition including: 0.7 to 1.8% by weight of carbon (C); 0 to 1.8% by weight of silicon (Si); 0 to 1.0% by weight of manganese (Mn); 0 to 0.5% by weight of sulfur (S); 2.0 to 15.0% by weight of chromium (Cr); 2.5 to 18.0% by weight of molybdenum (Mo); 0.4 to 2.0% by weight of vanadium (V); 10.0 to 20.0% by weight of copper (Cu); 0.8 to 4.0% by weight of tungsten (W); 0 to 12.0% by weight of cobalt (Co); 0 to 3.5% by weight of nickel (Ni); and a remainder of iron (Fe) and production-related contaminations.

17. The method according to claim 11, wherein the first metallurgical powder has a composition including: 0.5 to 1.5% by weight of carbon (C); 0 to 0.8% by weight of silicon (Si); 0 to 1.0% by weight of sulfur (S); 0 to 1.0% by weight of manganese (Mn); 0 to 1.0% by weight of chromium (Cr); 0 to 1.0% by weight of molybdenum (Mo); 28.0 to 48.0% by weight of copper (Cu); 0 to 1.0% by weight of nickel (Ni); and a remainder of iron (Fe) and production-related contaminations.

18. The method according to claim 11, wherein the second metallurgical powder has a composition including: 1.0 to 1.8% by weight of carbon (C); 0.2 to 1.8% by weight of silicon (Si); 0 to 0.6% by weight of manganese (Mn); 0 to 0.5% by weight of sulfur (S); 10.0 to 15.0% by weight of chromium (Cr); 2.5 to 4.5% by weight of molybdenum (Mo); 0.4 to 1.0% by weight of vanadium (V); 12.0 to 20.0% by weight of copper (Cu); 0.8 to 1.5% by weight of tungsten (W); 0 to 2.0% by weight of cobalt (Co); 0 to 3.5% by weight of nickel (Ni); and a remainder of iron (Fe) and production-related contaminations.

19. The method according to claim 11, wherein the second metallurgical powder has a composition including: 0.7 to 1.5% by weight of carbon (C); 0 to 1.0% by weight of silicon (Si); 0 to 1.0% by weight of manganese (Mn); 0 to 0.5% by weight of sulfur (S); 2.0 to 4.0% by weight of chromium (Cr); 12.0 to 18.0% by weight of molybdenum (Mo); 1.0 to 2.0% by weight of vanadium (V); 10.0 to 20.0% by weight of copper (Cu); 2.0 to 4.0% by weight of tungsten (W); 8.0 to 12.0% by weight of cobalt (Co); 0 to 3.5% by weight of nickel (Ni); and a remainder of iron (Fe) and production-related contaminations.

20. The method according to claim 11, wherein the angle formed by the contact surface and the axis is 60°.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] It shown, in each case schematically:

[0040] FIG. 1 shows a section through a green product having two metallurgical powders,

[0041] FIG. 2 shows a section through the green product in another exemplary embodiment,

[0042] FIG. 3 shows a section through the green product in a further exemplary embodiment,

[0043] FIG. 4 shows a section through an arrangement having a component and a structural body produced out of the green product.

DETAILED DESCRIPTION

[0044] For producing a component 11 exemplarily shown in FIG. 4, a green product 1, such as is shown for example in the FIGS. 1 to 3, is initially produced.

[0045] For producing the green product 1, a first metallurgical powder 2 and a second metallurgical powder 3 that is distinct from the first metallurgical powder 2 are filled into a mould 4, wherein the FIGS. 1 to 3 each show a state in which both powders 2, 3 are already filled into the mould 4. Here, the first powder 2 is initially filled into the mould 4. This is performed in such a manner that an outer surface 5 of the first powder 2, in the following also referred to as contact surface 5, forms an angle 7 between 55° and 65°, preferably between 58° and 62°, particularly preferably 60° with an axis 6 of the green product 1, in particular and preferably also of the future component 11. Following this, the second powder 3 is filled into the mould 4 in such a manner that the second powder 3 adjoins the contact surface 5 and is in contact with the same.

[0046] Following this, the green product 1 is produced by jointly compressing the powders 2, 3. Following this, the green product 1 is sintered in order to produce the component 11. In the process it is conceivable to infiltrate the green product 1 during the sintering 1 with copper or a copper alloy with a content of at least 70% by weight. Following the sintering, the component 11 or a moulded part (not shown) produced from the green product 1 can be heat-treated. When a moulded part is produced out of the green product 1 the moulded part is reworked and thus brought to size in order to produce the component 11.

[0047] In the shown exemplary embodiments, the green product 1 and the future component 11 are rotation-symmetrical with respect to the axis 6.

[0048] There, the sintered first powder 2 in the component 11 forms a first portion 8 which serves as core 9 of the component 11. By contrast, the sintered second powder 3 forms a second portion 10 of the component 11 and is arranged outside on the component 11, thus forming an outside 20 of the component 11.

[0049] According to FIG. 4, the component 11 is preferentially such a component which in an associated arrangement 12 is in tribological contact with an associated component 13, which for better distinction is also referred to as structural body 13 in the following. The component 11 can be in particular a ring 14, for example, a valve seed ring 15. In the arrangement 12, the valve seed ring 15 is in tribological contact with a valve 21 as structural body 13.

[0050] Preferably, the second powder 3, which, sintered, forms the second loaded portion 10 of the component 11, is more resistant than the first powder 2. The first powder 2 or the sintered first powder 2 is a carrier material 16 and the second powder 3 or the sintered second powder 3 a function material 17 of the component 11.

[0051] The first powder 2 and thus the carrier material 16 can have the following composition: C: 0.3 to 1.8% by weight; Si: 0 to 1.8% by weight; S: 0 to 1.0% by weight; Mn: 0 to 1.0% by weight; Cr: 0 to 15.0% by weight; Mo: 0 to 2.5% by weight; Cu: 5 to 48% by weight; Ni: 0 to 3.5% by weight; W: 0 to 5.5% by weight; V: 0 to 2.0% by weight; remainder Fe and production-related contaminations.

[0052] The second powder 3 and thus the function material 17 can have the following composition: 0.7 to 1.8% by weight; Si: 0 to 1.8% by weight; Mn: 0 to 1.0% by weight; S: 0 to 0.5% by weight; Cr: 2.0 to 15.0% by weight; Mo: 2.5 to 18.0% by weight; V: 0.4 to 2.0% by weight; Cu: 10.0 to 20.0% by weight; W: 0.8 to 4.0% by weight; Co: 0 to 12.0% by weight; Ni: 0 to 3.5% by weight; remainder Fe and production-related contaminations.

[0053] The structural body 13 is preferentially based on iron and/or nickel. The structural body 13 can have a protective coating (not shown) and/or be nitrided.

[0054] In the shown exemplary embodiments, the contact surfaces 5 each run rotation-symmetrically with respect to the axis 6. In the exemplary embodiments of the FIGS. 1 and 2, the contact surface 5 forming the angle 7 between 55° and 65° with the axis 6 extends over the entire outer side of the first powder 2. Compared with this, this contact surface 5 is limited in the exemplary embodiment of FIG. 3, i.e. does not extend over the entire outer side of the first powder 2. In this exemplary embodiment, a flat side 18 of the first powder 2 adjoins the contact surface 5 forming an angle between 55° and 65° with the axis 6. Here, the flat side 18 is arranged on the inside of the contact surface 5 and smaller than the contact surface 5.

[0055] In the exemplary embodiments of the FIGS. 2 and 3, a recess 19 each is provided in the green product 1 and thus in the future component 11. Compared with this, no such recesses 19 are provided in the green product 1 and thus in the future component 11 in the exemplary embodiment of FIG. 1.