JPH01218778A - Manufacture of inner diameter sliding member - Google Patents

Abstract

PURPOSE:To enable the manufacture of good productivity without being limited to the shape of a base metal by forming a hole part in the same shape as that of a punch by extrusion-forging the sliding material of the base metal surface by a punch. CONSTITUTION:The slidable powder with Fe, MoS2 and C as the main component is sintered after its compacting on both end faces of the base metal 3 made by a S43C material, for instance. When a punch 4 is pressed by fixing a lower punch 5 by a forging press, the sliding material 1 of the upper punch 4 side is subjected to backward extrusion forging, the sliding material 2 of the lower punch 5 side is subjected to forward extrusion forging and inner diameter sliding part 1a, 2a is respectively formed. The lower punch 5 is removed at the time when the upper and lower sliding members 1, 2 are brought into contact, punching is executed by the upper punch 4 by supporting the lower face of the base metal 3, toothing is executed and the bushed gear for shaft is obtd. by executing finishing after executing a heat treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applications i) The present invention is applicable to bushings around the shaft of gears, cylinder blocks of axial plunger type hydraulic pumps, etc.

This invention relates to a manufacturing method for fixing a sliding material to the inner diameter sliding portion of a base material, which can be processed with particularly high efficiency.

The present invention relates to an epoch-making method for manufacturing an inner-diameter sliding member that can omit finishing processing.

(Prior art) Conventionally, sliding members on the inner diameter of shaft circumferential bushings such as single-port gears and cylinder blocks of axial plunger pumps have been made by inserting a pusher made of a sliding material into the inner diameter, or by inserting a bushing made of a sliding material into the inner diameter, or by inserting a bushing made of a sliding material into the inner diameter, or by inserting a bushing made of a sliding material into the inner diameter, or by inserting a bushing made of a sliding material into the inner diameter. A bush manufacturing method in which the sliding material is placed only on the inner diameter part of the base material by spreading sliding material powder on the base material and rolling a two-layer square plate made by rolling a two-layer material joined to a steel plate by sintering. There was a method called makibutshu.

(Problems to be Solved by the Invention) Among the conventional techniques described above, the method of inserting a bushing requires high precision in finishing the inner diameter portion of the base material, and also requires a process of inserting a bushing.

The disadvantage is that the number of steps is large, processing efficiency is low, and productivity is reduced. In addition, in the method called one-turn bushing, there was a problem in that the manufacturing process was slow when the base material became thick.

(Means for Solving the Problems) The present invention was made to solve the problems in the conventional technology, and the sliding material 1.2 on the surface of the base material 3 is punched 4.
．． The sliding material layer 1a is formed on the base material 3 by extrusion and forging according to Step 5.

The present invention relates to a method of manufacturing an inner diameter sliding member, characterized in that a hole having the same shape as the punches 4 and 5 to which the punches 2a are fixed is formed.

(effect) The effects of the manufacturing method of the above structure are as follows.

By extruding and forging the sliding material 1.2 on the surface of the base material 3 with the punch 4.5, the base material 3 and the sliding material 1.2 are deformed and a hole having the same shape as the punches 4 and 5 is formed. be done.

In the above process, if the elongation of the sliding materials 1 and 2 is smaller than that of the base material 3, the layers of the sliding materials 1 and 2 will be torn. By heating and forging to a temperature where the deformation resistance is closest, a thin layer of the sliding material 1.2 is uniformly formed in the hole diameter portion formed by the punch 4.5.

In addition, in order to equalize the elongation of different materials, instead of heating as described above, if the base material 3 and the sliding materials 1 and 2 are joined in advance by diffusion bonding or casting, the base material 3 and the sliding materials Even if there is some difference in elongation with material 1.2, punch 4,
A thin layer 1a of sliding materials 1 and 2 is placed on the hole diameter portion formed by 5.
.

2a can be formed.

(Example) Two examples of the present invention will be described below in detail based on FIGS. 1 to 5.

A method of manufacturing a gear with a shaft circumference 3 and a bushing according to a first embodiment of the present invention shown in FIG. 1 will be described.

First, Fe was applied to both end surfaces of the base material 3 made of 343C material.
MoS2. After compacting the sliding powder mainly composed of C,
Sinter.

Next, fix the lower punch 5 using a forging press.

When the upper punch 4 is pressurized, the sliding material 1 on the upper punch 4 side is backwardly extruded and forged, and the sliding material 2 on the lower punch 5 side is forwardly extruded and forged, forming inner diameter sliding parts 1a and 2a, respectively. be done.

When the upper and lower sliding members 1.2 come into contact, the lower punch 5 is removed, and the lower surface of the base material 3 is supported and punched with the upper punch, toothed and heat treated, and then finished. By processing, a gear with a shaft bushing can be obtained.

In addition, after front and rear extrusion forging, the remaining heat is used to perform warm shaving to create teeth, and in the same way, heat treatment,
Products can also be obtained by finishing.

FIG. 3 shows the detailed shape of the punch 4.5 used in this example.

FIG. 4 shows the punch land portion of punch 4.5 with r=3.
The relationship between the radial position and elongation rate of the sliding material 1.2 when the punch cone angle α is changed at 0 m+n is shown.

As can be seen from FIG. 4, the larger α is, the smaller the change in elongation rate in the radial position is, which is more convenient for forming a layer of sliding material.

Moreover, FIG. 5 shows the relationship between the radial position and elongation rate when r of the punch land portion is changed when the punch circle and the cone angle are α-15°.

In FIG. 5, it can be seen that the larger the r of the punch land, the smaller the change in the elongation rate in the radial position, which is convenient for forming a layer of sliding material.

As can be seen from FIGS. 4 and 5, it is generally more advantageous to make α larger than r in order to reduce the maximum elongation of the sliding material 1.2.

A method of manufacturing a cylinder block for an axial planar pump according to a second embodiment of the present invention shown in FIG. 2 will be described.

First, insert the lower punch 17 into the mold material 15.

Engage the mandrel 14 with the center of the lower punch 17.

After that, Fe, Mo S2. .

C powder 12 is supplied, and then Fe-based powder 13 is supplied as a base material, followed by Fe as a sliding material powder.

After filling with MoS, C powder 11, the powder is compacted using an upper punch 16, and then sintered.

Next, the upper punch 16 is taken out, forged and extruded using the piston punch 18, and finally the cocoon-shaped port is machined to create the cylinder block of the axial plunger pump.

(Effect of the invention) As described in 5 above, the present invention has the following effects.

(1) Since the base material and the sliding material are integrally molded, there is no need to process the bushing fitting hole in the base material.

The process of inserting the bushing into the mating hole of the base material is no longer necessary.
Since the man-hours required for these steps are omitted, productivity is greatly improved and costs are reduced.

(2) Since the base material and the sliding material are integrally molded, the number of parts can be reduced by 9, and it is easy to automate.

(3) Like the conventional technique of rolling bushes.

Not only is there no restriction on the thickness of the base material, there is no need for the thickness of the base material to be uniform, and there is no restriction on the shape of the base material.

[Brief explanation of the drawing]

Figure 1 is a manufacturing process diagram showing the first embodiment of the present invention;
Figure 3 is a manufacturing process diagram showing the second embodiment of the present invention, Figure 2 is a detailed diagram of the punch used in the first embodiment of the present invention, and Figure 4 is a detailed diagram of the punch used in the first embodiment of the present invention.
Figures and Figure 5. FIG. 3 is a diagram showing the relationship between the radial position and elongation rate of the wear-resistant material in the first embodiment of the present invention. 1, 2.11.12...Sliding member l a, 2 a, lla, 12a...Sliding member 3.1
3... Base material 4.16... Upper punch 5.17
... Lower punch 15 ... Shape material 18 ... Piston punch patent applicant Komatsu Ltd. Representative (patent attorney) Oka 1) Kazuyoshi

Claims (2)

[Claims] (1) By extruding and forging the sliding materials 1 and 2 on the surface of the base material 3 with the punches 4 and 5, the punches 4 and 5 have the sliding material layers 1a and 2a fixed to the base material 3. A method for manufacturing an inner diameter sliding member, characterized by forming holes having the same shape. (2) The sliding materials 1 and 2 according to claim (1) are either directly cast into the base material 3 or bonded to the base material 3 in advance by powder filling sintering or the like before extrusion forging. A method of manufacturing an inner diameter sliding member, characterized in that: