JP2006052757A - Sliding member, powder molding system, and manufacturing method for compact - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding member capable of reducing assembling man-hours for equipment and restraining leakage of impregnated lubricating oil or sufficiently impregnating lubricating oil, a powder molding system capable of molding compacts so as to form the sliding member by a sintering process, and a manufacturing method for compacts. <P>SOLUTION: Either of an inner peripheral surface side and an outer peripheral surface side in the cylindrical sliding member 10 having a sliding surface contains carbon from 50 to 100 mass%. When the carbon in a layer is 100 mass% or less, the balance in the layer becomes a metal component as a sintered sliding layer 10a, and the other side becomes a sintered metal layer 10b with high strength rather than the sintered sliding layer 10a. The sintered sliding layer 10a and sintered metal layer 10b are mutually combined in a sintered bonding state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cylindrical sliding member having a sliding surface, a powder forming apparatus for forming a green compact for forming the sliding member by sintering, and a method for manufacturing the green compact.

Conventionally, this type of sliding member, for example, as shown in Patent Document 1 below, reduces frictional resistance with, for example, a shaft member supported on the sliding surface, or has good lubricity. Therefore, in order to make the sliding member wear resistant, the powder containing carbon is compressed into a green compact, and then sintered. In other words, the sliding member is generally integrally formed of a powder containing carbon.
JP 2004-36649 A

  However, in the conventional sliding member, since the whole is integrally formed of carbon-containing powder, the sliding member has low strength and cannot be incorporated into the apparatus by press fitting. There was a problem that man-hours were required. Furthermore, since the sliding member is integrally formed as described above, the sliding member has a substantially uniform porosity as a whole. For example, the sliding member is impregnated with lubricating oil. In the case of a so-called oil-impregnated bearing, for example, when the sliding member is used in a state where a shaft member is slid on the sliding surface, the lubricating oil easily leaks or the sliding member If the moving member is formed at a high density with a reduced porosity and is provided with a necessary and sufficient strength, there is a problem that the sliding member cannot be impregnated with a sufficient amount of the lubricating oil.

  The present invention has been made in consideration of such circumstances, and it is possible to reduce the man-hours for assembling into the apparatus, and to prevent the impregnated lubricating oil from leaking or to remove the lubricating oil. It is an object of the present invention to provide a sliding member that can be sufficiently impregnated, a powder molding apparatus that molds a green compact for forming the sliding member by sintering, and a method for manufacturing the green compact.

  In order to solve such problems and achieve the above object, the sliding member of the present invention is a cylindrical sliding member having a sliding surface, which is either the inner peripheral surface side or the outer peripheral surface side. On the other hand, when the carbon contains 50 (mass%) or more and 100 (mass%) or less of carbon, and the carbon is less than 100 (mass%), the remainder is a sintered sliding layer which is a metal component. The other is a sintered metal layer having a higher strength than the sintered sliding layer, and the sintered sliding layer and the sintered metal layer are sinter-bonded to each other.

According to this invention, either the inner peripheral surface side or the outer peripheral surface side is the sintered sliding layer, and the other is the sintered metal layer having higher strength than the sintered sliding layer. Therefore, the sliding member can be incorporated into the apparatus by press fitting by fitting the other peripheral surface into the apparatus. That is, the sliding member having the sliding surface formed of the sintered sliding layer can be incorporated into the apparatus by press-fitting, and the number of steps for assembling the sliding member into the apparatus can be reduced.
Further, since the sintered sliding layer and the sintered metal layer are sintered and bonded to each other, it is possible to firmly bond these metal layers, and the sliding member has a two-layer structure. It is possible to suppress the occurrence of so-called delamination due to.

Furthermore, since the sliding member is composed of the sintered sliding layer and the sintered metal layer, it is possible to make these porosity different. Therefore, for example, by increasing the porosity of the sintered metal layer inserted into the apparatus, it is possible to increase the amount of lubricating oil that can be impregnated in the sliding member, and sliding with improved oil retention. A member can be obtained. Further, by reducing the porosity of the sintered metal layer, it is possible to prevent the lubricating oil impregnated in the sliding member from leaking from the sintered metal layer.
As described above, the porosity of the sintered metal layer can be appropriately changed according to the use of the sliding member.
The sintered metal layer is not limited to a single metal element, but also includes an alloy.

The sliding member of the present invention is the sliding member according to claim 1, wherein the sintered sliding layer has a porosity of 1% to 35%, and the sintered metal layer has a porosity of 1%. It is characterized by being made 12% or less.
According to this invention, the density of the sintered metal layer is increased, and leakage of the lubricating oil impregnated in the sliding member from the sintered metal layer can be suppressed.

The sliding member according to the present invention is the sliding member according to claim 1, wherein the sintered sliding layer has a porosity of 1% to 35%, and the sintered metal layer has a porosity of 12%. It is characterized by being larger and 35% or less.
According to this invention, the density of the sintered metal layer can be reduced, the amount of lubricating oil that can be impregnated in the sliding member can be increased, and the oil retention can be improved. Thus, even if the sintered metal layer is reduced in density as described above, it becomes possible to provide the metal layer with a necessary minimum strength, and the other peripheral surface formed by the sintered metal layer is provided as an apparatus. This sliding member can be incorporated into the apparatus by press fitting.

The sliding member of the present invention is the sliding member according to any one of claims 1 to 3, wherein the sintered sliding layer has an end surface in the axial direction of the sliding member and an inner peripheral surface side. It is characterized by being formed integrally.
According to this invention, not only the inner peripheral surface of the sliding member but also the end surface can be made the sliding surface.

A powder molding apparatus according to the present invention is a powder molding apparatus for molding a green compact for forming the sliding member according to any one of claims 1 to 4 by sintering, wherein the die has a through hole formed therein. A partition cylinder disposed coaxially with the through hole in the through hole, a cylindrical lower punch, and a core rod, and an upper punch disposed coaxially with the through hole above the die The lower punch is separately disposed on the inner side and the outer side of the partition tube, and the partition tube, the lower punch, and the upper punch are relatively relative to the die in the axial direction of the through hole. It is supported so as to be able to advance and retreat, an inner peripheral surface of the through hole forms an outer peripheral surface of the green compact, and an outer peripheral surface of the core rod forms an inner peripheral surface of the green compact, the partition tube, And the lower bread either inside or outside Is disposed in the forward position, the other lower punch is disposed in the retracted position to form a second space, the second powder is filled in the space, and the one lower punch is moved backward to move the first space. When the carbon contains 50 (mass%) or more and 100 (mass%) or less of carbon in the space, and the carbon is less than 100 (mass%), the remainder is filled with the first powder. Then, after the partition tube is moved backward, or while the partition tube is moved backward, the upper punch is moved forward to compress the first and second powders. To do.
According to this invention, the green compact for forming the sliding member in any one of Claim 1 to 4 can be formed easily and reliably.

  In addition, the powder molding apparatus according to the present invention is the powder molding apparatus according to claim 5, wherein at least one of the inner peripheral surface and the outer peripheral surface of the partition tube has an uneven portion extending over the entire periphery. It is characterized by.

  According to this invention, when the partition tube is moved backward, among the powders filled in the spaces, it is possible to mix powders located on the side in contact with the partition tube. . Therefore, by sintering this green compact, it is possible to form a sliding member in which the sintered sliding layer and the sintered metal layer are firmly joined together by the anchor effect.

  The green compact manufacturing method of the present invention is a green compact manufacturing method for forming a green compact for forming the sliding member according to any one of claims 1 to 4 by sintering. The powder compact is molded using the powder molding apparatus according to Item 5 or 6.

  According to the present invention, it is possible to reduce the number of steps for assembling into the apparatus, and it is possible to suppress leakage of the impregnated lubricating oil or to sufficiently impregnate the lubricating oil. It is possible to provide a member, a powder forming apparatus for forming a green compact for forming the sliding member by sintering, and a method for manufacturing the green compact.

  FIG. 1 shows a cross-sectional side view of a sliding member 10 according to a first embodiment of the present invention, wherein the inner peripheral surface side contains 50 (mass%) or more and 100 (mass%) or less of carbon, and When the amount of carbon is less than 100 (mass%), the remaining is a sintered sliding layer 10a having a metal component, and the outer peripheral surface side is a sintered metal layer 10b having higher strength than the sintered sliding layer 10a. The sintered sliding layer 10a and the sintered metal layer 10b are sinter-bonded to each other. Then, a shaft member 101 rotatably supported on the inner peripheral surface 10c of the sliding member 10 is inserted, and the outer peripheral surface 10d is fitted into a hole 102a formed in the device 102 by press-fitting. Is arranged in the apparatus 102. That is, the inner peripheral surface 10c of the sliding member 10 is a sliding surface, and this sliding surface is formed by the sintered sliding layer 10a. Furthermore, in this embodiment, the sintered sliding layer 10a also forms one end face 10e in the axial direction of the sliding member 10, and the inner peripheral surface side of the sliding member 10 and the above One end face 10e is formed integrally with the sintered sliding layer 10a. The sliding member 10 is arranged in the device 102 in a state where the one end surface 10e is in contact with the bottom surface of the hole 102a.

Here, the sintered sliding layer 10a and the sintered metal layer 10b are formed by forming a green compact with first and second powders 33 and 34, which will be described later, and then sintering the green compact 10a and 10b. The first and second powders 33 and 34 have a difference in thermal expansion coefficient that prevents the bonding interface from peeling off.
The sintered sliding layer 10a and the sintered metal layer 10b are more preferably formed of the following materials. As the sintered sliding layer 10a, for example, a C—Cu—Ni alloy, a C—Cu—Ni—Sn alloy, a C—Ni—Cu alloy, a C—Ni—Sn—Cu alloy, or Examples of the sintered metal layer 10b include a Cu—Ni alloy, a Cu—Ni—Sn alloy, a Cu—Sn alloy, and an Fe alloy. An alloy, a Cu alloy, an Fe—Cu alloy, an Fe—C alloy, a Cu—Zn alloy, or the like can be given.

  When the sintered sliding layer 10a is formed of a C—Cu—Ni alloy or a C—Cu—Ni—Sn alloy, the sintered metal layer 10b includes a Cu—Ni alloy, Cu—Ni. -Sn based alloy or Cu-Sn based alloy, and when the sintered sliding layer 10a is formed of C-Ni-Cu based alloy or C-Ni-Sn-Cu based alloy, The binder metal layer 10b is formed of a Cu—Ni alloy, a Cu—Ni—Sn alloy, or a Cu—Sn alloy, and the sintered sliding layer 10a is formed of a Cu—Fe—C alloy. In this case, the sintered metal layer 10b is formed of an Fe-based alloy, a Cu-based alloy, or an Fe—Cu-based alloy.

  In the above combination, the shrinkage rate of the second powder 34 forming the sintered metal layer 10b due to the sintering is larger than that of the first powder 33 forming the sintered sliding layer 10a, and the contraction of the first powder 33 is. The rate is smaller or expands. The sintered sliding layer 10a has a porosity of 1% to 35%, and the sintered metal layer 10b has a porosity of 1% to 12%, or greater than 12% and 35% or less.

  In particular, the sintered sliding layer 10a is formed of a C—Ni—Sn—Cu alloy, Ni is 12 to 40 (mass%), Sn is 5 to 15 (mass%), and Cu is 5 to 40 (mass). %), It is excellent in lubricity and corrosion resistance, and is suitable for use in pumps (fuel, water).

When the sintered metal layer 10b is formed of a Cu—Ni-based alloy and Ni is 12 to 49 (mass%), it has excellent corrosion resistance and can improve the strength, and pumps (fuel, water, Suitable for use in Moreover, when the sintered metal layer 10b is formed of an Fe—Cu alloy and Cu is 20 to 49 (mass%), this strength can be improved. Further, the sintered metal layer 10b may be formed of Cu to Sn based on 7 to 12 (mass%) or Cu to Zn based alloy of 15 to 40 (mass%).
Note that C contained in the first powder 33 forming the sintered sliding layer 10a is so-called granulated carbon particles having a diameter of about several μm, and the particle size is set to about 50 μm or more.

Next, an embodiment of a powder forming apparatus for forming a green compact for forming the sliding member 10 configured as described above by sintering and a method for manufacturing the green compact will be described.
2 to 9 are enlarged cross-sectional views of the main part of the powder molding apparatus 20, and are arranged coaxially with the through-hole 21a in the through-hole 21a and the die 21 in which the through-hole 21a is formed. A partition cylinder 22, a cylindrical lower punch 23, a core rod 25, an upper punch 26 (FIG. 6) disposed above the die 21 and coaxially with the through hole 21a, and a first described later. And a shoe box 29 for filling the second spaces 31 and 32 with powder.

  The lower punches 23 are separately provided on the inner side and the outer side of the partition tube 22, and in this embodiment, the first lower punch 23a and the second lower punch whose inner diameter and outer diameter are larger than those of the first lower punch 23a. The first lower punch 23 a is disposed inside the partition tube 22, and the second lower punch 23 b is disposed outside the partition tube 22. The partition cylinder 22, the lower punch 23, and the upper punch 26 are supported so as to be able to advance and retreat via a cam mechanism (not shown) with respect to the die 21 in the direction of the central axis of the through hole 21a, and the inner peripheral surface of the through hole 21a. However, the outer peripheral surface of the green compact to be formed is formed, and the outer peripheral surface of the core rod 25 is configured to form the inner peripheral surface of the green compact.

  When the first lower punch 23 a moves forward and backward, the inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the core rod 25, while the outer peripheral surface is in sliding contact with the inner peripheral surface of the partition tube 22. Further, when the second lower punch 23b moves forward and backward, the inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the partition tube 22, while the outer peripheral surface is in sliding contact with the inner peripheral surface of the through hole 21a. Further, when the partition tube 22 moves back and forth, the inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the first lower punch 23a, while the outer peripheral surface is in sliding contact with the inner peripheral surface of the second lower punch 23b.

  In the above configuration, when the second lower punch 23b is disposed at the retracted position from the state in which the tip surfaces of the partition tube 22 and the lower punch 23 and the upper surfaces of the core rod 25 and the die 21 are substantially flush, A second space 32 defined by the outer peripheral surface of the tube 22, the inner peripheral surface of the through hole 21a, and the tip surface of the second lower punch 23b is formed. Similarly, when the first lower punch 23a is disposed at the retracted position, the first lower punch 23a is defined by the inner peripheral surface of the partition tube 22, the outer peripheral surface of the core rod 25, and the front end surface of the first lower punch 23a. One space 31 is formed.

  The shoe box 29 is slidably contacted with the upper surface of the die 21 and supported so as to be able to advance and retreat with respect to the through hole 21a along the surface. When the shoe box 29 reaches the through hole 21a, powder is applied to the spaces 31 and 32. It is designed to be filled. In the present embodiment, the shoe box 29 includes a first shoe box 29a and a second shoe box 29b. These 29a and 29b are loaded with powders of different materials, and the first space 31 has a first shoe. The shoe box 29a is filled with the first powder 33 forming the sintered sliding layer 10a, and the second space 32 is filled with the second powder 34 forming the sintered metal layer 10b by the second shoe box 29b. It has become.

  By the way, in this embodiment, as shown in FIG. 8, a convex portion 22 a that is convex outward in the radial direction is extended over the entire length in the axial direction on the outer peripheral surface of the partition tube 22. A plurality of portions are formed at predetermined intervals in the direction, that is, uneven portions are formed.

Next, a method for forming a green compact using the powder molding apparatus 20 configured as described above will be described.
First, as shown in FIG. 2, the partition tube 22 and the first lower punch 23a disposed inside the partition tube 22 are disposed at the forward position, and the second lower punch 23b disposed outside is disposed at the retracted position. Thus, the second space 32 is formed. Thereafter, the second shoe box 29b is moved forward, and when the second shoe box 29b reaches above the second space 32, the second powder 32 is filled into the second space 32 by the shoe box 29b (A shown in FIG. 9).
Next, as shown in FIG. 3, after the first lower punch 23a is moved backward to form the first space 31, the first shoe box 29a is moved forward as shown in FIG. The first powder 31 is filled into the first space 31 by the shoe box 29a (B shown in FIG. 9). At this time, the first powder 33 is also deposited on the upper surface of the second powder 34 filled in the second space 32.

  Thereafter, as shown in FIG. 5, after the partition tube 22 is moved backward (C shown in FIG. 9), the upper punch 26 is moved forward as shown in FIG. The first and second powders 33 and 34 are compressed in the axial direction by the second lower punches 23a and 23b and the upper surface of the partition tube 22. At this time, the first and second lower punches 23a and 23b and the partition tube 22 are gradually moved forward with respect to the die 21 in a state where the upper punch 26 has reached the forward end position, and the first and second powders are moved. 33 and 34 are further compressed (D shown in FIG. 9). As described above, the green compact 35 in which the inner peripheral surface side and one end surface (upper surface in the illustrated example) 10e in the axial direction are integrally formed with the first powder 33 and the outer peripheral surface side is formed with the second powder 34. Form.

Then, the upper punch 26 is moved backward relative to the die 21, and the first and second lower punches 23a, 23b and the partition tube 22 are moved forward relative to the die 21 as shown in FIG. The tip surfaces of the first and second lower punches 23a and 23b and the partition tube 22 are substantially flush with the upper surfaces of the core rod 25 and the die 21, and the green compact 35 is taken out from the spaces 31 and 32 (E shown in FIG. 9). .
Next, the green compact 35 is sintered to form the sliding member 10 shown in FIG.

As described above, according to the sliding member 10 according to the present embodiment, the inner peripheral surface side is the sintered sliding layer 10a containing 50 (mass%) or more and 100 (mass%) or less of carbon, Since the outer peripheral surface side is a sintered metal layer 10b having a strength higher than that of the sintered sliding layer 10a, the sliding member 10 is assembled into the device 102 by press fitting by fitting the outer peripheral surface to the device 102. Is possible. That is, the sliding member 10 in which the inner peripheral surface 10c and the one end surface 10e as the sliding surfaces are formed of the sintered sliding layer 10a containing carbon can be incorporated into the apparatus 102 by press-fitting. The man-hours for assembling the sliding member 10 into the device 102 can be reduced.
Further, since the sintered sliding layer 10a and the sintered metal layer 10b are sinter-bonded to each other, it becomes possible to firmly bond these 10a and 10b, and the sliding member 10 has a two-layer structure. Occurrence of so-called delamination can be suppressed.

Furthermore, since the sliding member 10 is composed of the sintered sliding layer 10a and the sintered metal layer 10b, the porosity of these 10a and 10b can be made different. Therefore, by increasing the porosity of the sintered metal layer 10b inserted into the apparatus 102, it is possible to increase the amount of lubricating oil that can be impregnated in the sliding member 10, and the sliding with improved oil retention. The member 10 can be obtained. Further, by reducing the porosity of the sintered metal layer 10b, it is possible to prevent the lubricating oil impregnated in the sliding member 10 from leaking from the sintered metal layer 10b.
As described above, the porosity of the sintered metal layer 10b can be appropriately changed according to the use of the sliding member 10.

  Further, when the porosity of the sintered sliding layer 10a is 1% or more and 35% or less, and the porosity of the sintered metal layer 10b is 1% or more and 12% or less, the high density of the sintered metal layer 10b. Therefore, the lubricating oil impregnated in the sliding member 10 can be prevented from leaking from the sintered metal layer 10b. Further, when the porosity of the sintered sliding layer 10a is 1% or more and 35% or less and the porosity of the sintered metal layer 10b is greater than 12% and 35% or less, the sintered metal layer 10b has a low porosity. Densification is achieved, the amount of lubricating oil that can be impregnated in the sliding member 10 can be increased, oil retention can be improved, and the sintered metal layer 10b thus reduced in density can be used. Even so, it becomes possible to provide the metal layer 10b with the necessary minimum strength, and by fitting the outer peripheral surface 10d of the sliding member 10 formed of the sintered metal layer 10b to the device 102, The sliding member 10 can be incorporated into the device 102 by press fitting.

  Furthermore, since the sliding member 10 integrally forms the one end face 10e and the inner peripheral surface side of the sliding member 10 in the sintered sliding layer, not only the inner peripheral surface 10c but also the one of the one end surface 10e. The end surface 10e can also be the sliding surface.

  Further, in the present embodiment, a plurality of convex portions 22a which are convex outward in the radial direction over the entire circumference are formed on the outer peripheral surface of the partition tube 22 with a predetermined interval. As shown in Fig. 2, when the partition tube 22 is moved backward, it is possible to mix the powders 33 and 34 located on the side in contact with the partition tube 22 among the first and second powders 33 and 34. become. Therefore, by sintering the obtained green compact 35, the sliding member 10 in which the sintered sliding layer 10a and the sintered metal layer 10b are firmly bonded to each other by the anchor effect can be formed.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the convex portion 22a formed on the outer peripheral surface of the partition tube 22 has a rectangular shape in a plan view as shown in FIG. 8, but instead of this convex portion, for example, It may be a wave shape or a sawtooth shape. Furthermore, although the structure which formed the said convex part in the outer peripheral surface of the partition cylinder 22 was shown, you may form in an inner peripheral surface and may form in an inner peripheral surface and an outer peripheral surface.

In the above embodiment, the powders 33 and 34 are compressed after filling the first and second spaces 31 and 32 with the powders 33 and 34 and then moving the partition tube 22 backward. The powders 33 and 34 may be compressed while moving 22 backward. In this case, the cycle time is shortened, and the green compact 35 can be formed with high efficiency.
Furthermore, in the said embodiment, after filling the 2nd space 32 with the 2nd powder 34, the 1st space 31 was formed and this space 31 was filled with the 1st powder 33. On the contrary, the 1st powder 31 is filled. After filling the space 31 with the first powder 33, the second space 32 may be formed, and the space 32 may be filled with the second powder 34.
Moreover, the material which forms the sintered sliding layer 10a and the sintered metal layer 10b is not restricted to the said embodiment. For example, the sintered sliding layer 10a may be formed only from carbon, and the sintered metal layer 10b is not limited to the above-described alloy, and may be formed from a single metal element.

  Furthermore, instead of the sliding member 10 shown in FIG. 1, a sliding member 40 as shown in FIG. 10 may be used. That is, the inner peripheral surface side is formed by the sintered sliding layer 40a, the outer peripheral surface side is formed by the sintered metal layer 40b, and the inner peripheral surface side is baked on both end surfaces in the axial direction of the sliding member 40. It may be formed by the binding sliding layer 40a and the outer peripheral surface side may be formed by the sintered metal layer 40b. Further, instead of the sliding members 10 and 40 shown in FIGS. 1 and 10, the outer peripheral surface side is formed by the sintered sliding layers 10a and 40a, and the inner peripheral surface side is formed by the sintered metal layers 10b and 40b. May be. Furthermore, the sliding member is not limited to a circular shape in plan view, and may be, for example, a rectangular shape. Furthermore, in the sliding member 10 shown in FIG. 1, it is also possible to form a tooth part on the outer peripheral part formed by the sintered metal layer 10b and use this as an idle gear, for example.

  A sliding member capable of reducing the number of steps for assembling into the apparatus and suppressing leakage of the impregnated lubricating oil or sufficiently impregnating the lubricating oil, and the sliding member It is possible to provide a powder forming apparatus for forming a green compact for forming a green body by sintering and a method for manufacturing the green compact.

It is a section side view of the sliding member shown as a 1st embodiment concerning the present invention. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment which concerns on this invention, Comprising: It is the 1st process drawing at the time of manufacturing a green compact. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment which concerns on this invention, Comprising: It is a 2nd process drawing at the time of manufacturing a green compact. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment based on this invention, Comprising: It is the 3rd process drawing at the time of manufacturing a green compact. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment which concerns on this invention, Comprising: It is a 4th process figure at the time of manufacturing a green compact. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment which concerns on this invention, Comprising: It is a 5th process figure at the time of manufacturing a green compact. It is a principal part expanded sectional view of the powder shaping | molding apparatus shown as one Embodiment which concerns on this invention, Comprising: It is a 6th process figure at the time of manufacturing a green compact. It is a cross-sectional top view of the powder shaping | molding apparatus shown in FIG. It is a cam diagram which shows the 1st-6th process of FIGS. 2-7. It is a cross-sectional side view of the sliding member shown as 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sliding member 10a Sintered sliding layer 10b Sintered metal layer 10c Inner peripheral surface (sliding surface)
10d outer peripheral surface 10e one end surface (sliding surface)
20 Powder molding device 21 Die 21a Through hole 22 Partition tube 22a Convex part (concave part)
23 Lower punch 23a First lower punch (one lower punch)
23b Second lower punch (the other lower punch)
25 core rod 26 upper punch 31 first space 32 second space 33 first powder 34 second powder 35 green compact

Claims (7)

A cylindrical sliding member having a sliding surface,
When either the inner peripheral surface side or the outer peripheral surface side contains 50 (mass%) or more and 100 (mass%) or less of carbon, and the carbon is less than 100 (mass%), the remainder is made a metal component. And the other is a sintered metal layer having a strength higher than that of the sintered sliding layer, and the sintered sliding layer and the sintered metal layer are sinter-bonded to each other. A sliding member characterized by that. The sliding member according to claim 1,
A sliding member, wherein the sintered sliding layer has a porosity of 1% to 35%, and the sintered metal layer has a porosity of 1% to 12%. The sliding member according to claim 1,
A sliding member, wherein the sintered sliding layer has a porosity of 1% to 35%, and the sintered metal layer has a porosity of more than 12% and 35% or less. In the sliding member in any one of Claim 1 to 3,
The sintered sliding layer is characterized in that the end surface in the axial direction of the sliding member and the inner peripheral surface side are integrally formed. A powder molding apparatus for molding a green compact for forming the sliding member according to any one of claims 1 to 4 by sintering,
A die in which a through hole is formed; a partition cylinder disposed coaxially with the through hole in the through hole; a cylindrical lower punch; and a core rod; and coaxially with the through hole above the die. And the lower punch is separately provided inside and outside the partition tube, and the partition tube, the lower punch, and the upper punch are arranged in the axial direction of the through hole. A structure in which the inner peripheral surface of the through hole forms an outer peripheral surface of the green compact and the outer peripheral surface of the core rod forms an inner peripheral surface of the green compact. And
The partition tube and the lower punch on either the inside or the outside thereof are disposed at the forward position, and the other lower punch is disposed at the retracted position to form a second space, and the second powder is formed in the space. And the one lower punch is moved backward to form a first space, and carbon is contained in the space from 50 (mass%) to 100 (mass%), and the carbon is 100 (mass%). ) Filling the first powder with the remaining metal component when less, and then moving the upper punch forward after moving the partition tube backward or while moving the partition tube backward, A powder molding apparatus characterized in that the first and second powders are compressed. The powder molding apparatus according to claim 5, wherein
A powder forming apparatus, wherein at least one of an inner peripheral surface and an outer peripheral surface of the partition tube is provided with an uneven portion over the entire periphery. A method for producing a green compact for forming a green compact for forming the sliding member according to any one of claims 1 to 4 by sintering,
A method for producing a green compact, comprising using the powder molding apparatus according to claim 5 or 6 to form the green compact.

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