JPH10168506A - Production of joined article of sintered compacts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence, e.g. of difference in level in the position of joining of sintered compacts and to secure chucking at the time of performing machining in the following stage, by reducing occurrence of variation resultant from the distortion of sintered compacts. SOLUTION: The joined article of sintered compacts is produced by sintering green compacts 13, 14 of sintering material to prepare sintered compacts 13, 14 and then joining the plural sintered compacts 13, 14. At this time, projecting parts 13f, 14f are formed on the surface of the green compacts 13, 14, and these green compacts 13, 14 are sintered in the state where respective projecting parts 13f, 14f are supported by a supporting material 40. As a result, the direct application of a gravitational pressing force to respective main bodies of the green compacts 13, 14 during sintering can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sintered product by sintering a compact of a sintered material to produce a sintered product, and joining a plurality of sintered products to produce a joined product. It relates to a manufacturing method.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show a related art method for manufacturing a joined product of a sintered body. The joined product of the sintered body is a golf club head portion 2 (hereinafter, referred to as a golf head 2), and is manufactured by joining a thin first sintered body 3 and a second sintered body 4 to each other. You. The first sintered body 3 and the second sintered body 4 are obtained by pressing a powder metal, which is a sintering material, in a mold, and also by pressing a powder metal in a mold. The obtained second compact 4 is obtained by sintering at a temperature of 1273 K or more in a sintering furnace (not shown). Here, as a method of sintering the first compact 3 and the second compact 4, as shown in FIG. 6, in a state where the two compacts 3 and 4 are overlapped at the joining positions 3 m and 4 m, A method of heating on a flat floor 8 in a sintering furnace is preferably used. In addition, the two molded bodies 3 and 4 are joined at the joining position 3
The reason for overlapping at m and 4 m is that, when distortion occurs during sintering, the two molded bodies 3 and 4 are distorted in the same direction to join at 3 m and 4 m.
This is to prevent m from shifting.

[0003] The first sintered body 3 and the second sintered body 4 thus obtained are joined by brazing. here,
Brazing may be performed simultaneously with sintering, or may be performed after sintering. The first sintered body 3 and the second sintered body 4 thus brazed are machined (see FIG. 8),
After finishing polishing, the coating is applied to the golf head 2. Then, a shaft (not shown) is assembled to the golf head 2 to complete a golf club.

[0004]

However, as described above, in the method in which the first compact 3 and the second compact 4 are placed on a flat floor 8 and heated, the two compacts 3 and 4 are heated. Thus, the pressing force caused by the own weight is directly applied from the floor 8. For this reason, the two moldings 3 and 4 are joined at 3 m and 4 m
However, even if they are overlapped with each other, the variation in strain during sintering becomes large. For this reason, the joining position 3 of the first and second sintered bodies 3 and 4
When the first and second sintered bodies 3 and 4 are machined in a subsequent process, a step is generated at m and 4 m, and the first and second sintered bodies 3 and 4 are chucked. May be unstable and cause processing failure.

In order to reduce the variation in the distortion of the first and second sintered bodies 3 and 4, as shown in FIG. 7, both molded bodies 3 and 4 are embedded in ceramic beads 9 and sintered. The method of doing is also adopted. According to this method, since the molded body 3 receives the pressing force due to its own weight almost uniformly from the surroundings, the variation in the distortion is smaller than that of placing the molded body 3 on the floor 8. However, even with this method, the distortion varies depending on the depth and direction in which the molded bodies 3 and 4 are embedded. Further, since the first sintered body 3 and the second sintered body 4 are thin,
When joining by brazing at the same time as sintering, there is also a problem that the brazing material flows to a portion other than the joining surface and the joining is likely to be incomplete.

Therefore, an object of the present invention is to make it difficult for a pressing force due to its own weight to be applied to a compact during sintering, and to reduce variation in distortion of a manufactured sintered compact. Is what you do. A second object of the present invention is to further reduce the variation in distortion of a manufactured sintered body and to perform good joining of the sintered bodies, in addition to the object of the first embodiment. Things.

[0007]

The above-mentioned object is achieved by a method for manufacturing a joined article of a sintered body having the following features. That is, in the method for manufacturing a bonded article of a sintered body according to claim 1, a sintered body is manufactured by sintering a molded body of a sintered material, and a plurality of sintered bodies are bonded to form a bonded article. In the method for manufacturing a joined product of a sintered body to be manufactured, a convex portion is formed on a surface of the molded body, and the molded body is sintered while the convex portion is supported by a supporting material. Is removed. According to the first aspect of the present invention, the sintering of the molded body is performed while the convex portion formed on the molded body is supported by the supporting material. Is not directly added. For this reason, the variation due to the distortion of the sintered body obtained by sintering the compact is reduced, and a step or the like is less likely to occur at the joining position of the sintered bodies. In addition, since the variation in distortion of the sintered body is reduced, chucking when machining is performed in a later process is also ensured.

A method for manufacturing a joined article of a sintered body according to a second aspect corresponds to the method for manufacturing a joined article of a sintered body according to the first aspect, which corresponds to a joint portion of the sintered body. The protrusion is formed in a flange shape at an edge of a molded body to be formed. According to the second aspect of the present invention, the convex portion is formed in the shape of a flange at the edge of the molded body, and the flange portion serves as a joining portion of the sintered body, so that the area of the joining surface increases. Even a thin sintered body can be reliably brazed or the like. In addition, since the convex portion is formed in a flange shape, the convex portion also serves to reinforce the molded body, and the distortion of the sintered body is further reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a joined article of a sintered body according to one embodiment of the present invention will be described below with reference to FIGS. The joined product of the sintered body in the present embodiment is a golf club head portion 12 (hereinafter, golf head 12).
It is). The golf head 12 is manufactured in a hollow shape by joining a thin first sintered body 13 having a concave portion and a second sintered body 14. The first sintered body 13
The second sintered body 14 is manufactured according to the procedure shown in FIGS. In FIGS. 1 to 4, important steps are shown first, and the figure numbers do not match the steps.

First, a metal powder M as a sintering material is subjected to isostatic pressing to form a first molded body 13 and a second molded body 14 having the same shape as the first sintered body 13 and the second sintered body 14. I do. Hydrostatic molding is a method of applying high pressure to a mold having elasticity in a water tank to press the metal powder M in the mold into a predetermined shape,
The convex mold 20 shown in FIG. 2 and the concave mold 30 shown in FIG. 3 are used according to the purpose.

The convex mold 20 includes a metal lower mold 21 for molding the inner wall surface of the first molded body 13 and a urethane rubber upper mold 22 for molding the outer wall surface of the first molded body 13. And a cavity 23 is formed inside the mold 20 in a state where the mold is clamped. The cavity 23
Is provided with a flange forming portion 23f such that a flange 13f (see FIG. 4) is formed at the edge of the first molded body 13. The lower die 21 is provided with a recess (not shown) for forming a projection 13t for positioning on the mating surface 13e of the flange 13f. Further, a passage (not shown) for supplying the metal powder M to the cavity 23 is formed in the convex mold 20, and this passage is provided with a plug (not shown) after the metal powder M is supplied. Not).

In order to form the first molded body 13 using the convex mold 20, first, the cavity 2 is formed through the passage.
3 is filled with metal powder M, and the passage is closed with a plug material. Next, the convex mold 20 is housed in a water tank, and a high pressure (approximately
400MPa). As a result, the upper mold 2 is also applied to the metal powder M.
2, a high pressure is applied, and the metal powder M is formed into the shape of the first formed body 13 as shown in FIG.
Thus, in the convex molding die 20, the first molding 13
Is formed by the lower mold 21 made of metal, and the forming accuracy of the mating surface of the inner wall surface and the flange 13f is improved.

Also, the second molded body 14 is molded by the same method as the first molded body 13 by the convex molding die 20 having a different shape of the cavity 23. As shown in FIG. 4, the second molded body 14 also has a flange 14 f formed at a position where the first molded body 13 is joined to the flange 13, and a positioning surface 14 e of the flange 14 f is used for positioning. Is provided. As shown in FIG. 3, the concave molding die 30 includes a first molded body 13 and a second sintered body 14.
The inner wall surface is formed with a lower mold 31 made of urethane rubber, and the outer wall surface is formed with an upper mold 32 made of metal.
Other structures are the same as those of the convex mold 20. That is, in the concave mold 30, the first molded body 13, the second sintered body 1
The outer wall surface of No. 4 is formed by the metal upper mold 32, and the forming accuracy of the outer wall surface is improved.

In this way, the first molded body 13 and the second molded body 14 molded by the convex molding die 20 and the like are arranged so that the projection 13t for positioning and the concave part 14t are fitted to each other. 13f and 14f are adjusted (see FIG. 4). Then, in this state, the first compact 13 and the second compact 14 are set in a sintering furnace (not shown) as shown in FIG. A ring-shaped support block 40 is installed in the sintering furnace, and the horizontal upper surface 42 of the support block 40 supports the flange 13f of the first molded body 13 from below. That is, the first molded body 13
And the second molded body 14 are supported by the support block 40 at the portions of the flanges 13f and 14f.
The force caused by its own weight is not directly applied to the main part of the third molded body 14 and the third molded body 14. Then, in this state, the first compact 13 and the second compact 14 are heated to about 1573K, whereby the metal powder M of the compacts 13 and 14 sinters to form the first sintered compact. 13 and the second sintered body 14 are manufactured. That is, the support block 40 functions as the support material of the present invention.

Next, the first sintered body 13 and the second sintered body 14 thus obtained are brazed at the positions of the mating surfaces 13e, 14e of the flanges 13f, 14f. In the next step, as shown in FIG. 5, the flanges 13f and 14f of the first sintered body 13 and the second sintered body 14 are gripped at the reference position by the chuck 44, and the surfaces of the sintered bodies 13 and 14 are formed. Is machined by the tool 45. Further, in the subsequent process, the flanges 13f, 1
4f is removed by machining or shearing, and after finishing polishing, painting is performed. by this,
The golf head 12 is completed, and the golf club is completed by assembling the completed golf head 12 to a shaft (not shown).

As described above, according to the method of manufacturing golf head 12 according to the present embodiment, first and second molded bodies 13 and 1 are formed.
In order to sinter the first and second compacts 13 and 14 while supporting the four flanges 13f and 14f with the support block 40, the main bodies of the first and second compacts 13 and 14 are sintered during sintering. No pressing force due to its own weight is directly applied to. Further, the flanges 13f and 14f also have a role of reinforcing the first and second molded bodies. For this reason, the variation in the strain of the first and second sintered bodies 13 and 14 obtained by sintering the first and second molded bodies 13 and 14 is reduced, and the sintering of those sintered bodies 13 and 14 is reduced. There is no step at the joining position. In addition, since the flange portions 13f and 14f of the sintered bodies 13 and 14 can be chucked in a subsequent step, unlike in the related art, processing defects due to instability of chucking do not occur. In addition, the first and second molded bodies 13 and 13 are located at the flanges 13f and 14f.
14, the first and second sintered bodies 13, 1
Even if 4 is thin, brazing or the like can be performed satisfactorily.

The embodiments of the present invention have been described above. However, it should be noted that the embodiments of the present invention have the following technical matters in addition to the technical matters described in the claims. Please note. (1) In the method for manufacturing a joined article of a sintered body according to claim 1, when machining the joined article obtained by joining the sintered bodies, the flange is gripped and positioned at a reference position. A method for manufacturing a joined article of a sintered body. Processing defects caused by unstable chucking can be prevented.

[0018]

According to the present invention, since the variation due to the distortion of the sintered body obtained by sintering the compact is reduced, a step or the like does not occur at the joining position of the plurality of sintered bodies, Good joining of the sintered body is performed.
Further, processing defects due to instability of chucking in a later process do not occur.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a sintering step of a method for manufacturing a joined article of a sintered body according to one embodiment of the present invention.

FIG. 2 is a side view illustrating a hydrostatic pressing step of the method for manufacturing a joined product of sintered bodies according to one embodiment of the present invention.

FIG. 3 is a side view illustrating a hydrostatic pressing step of the method for manufacturing a joined product of sintered bodies according to one embodiment of the present invention.

FIG. 4 is a side view illustrating a joining step of a method for manufacturing a joined article of a sintered body according to one embodiment of the present invention.

FIG. 5 is a side view illustrating a machining step of a method for manufacturing a joined product of sintered bodies according to one embodiment of the present invention.

FIG. 6 is a side view illustrating a conventional method for manufacturing a joined product of sintered bodies.

FIG. 7 is a side view illustrating a conventional method for manufacturing a joined product of sintered bodies.

FIG. 8 is a side view illustrating a conventional method for manufacturing a joined product of sintered bodies.

[Explanation of symbols]

 Reference Signs List 12 golf head (joined product) 13 first molded body, first sintered body 13f flange 13t projection 14 second molded body, second sintered body 14f flange 14t recess 20 molding die 30 molding die 40 support block (support material)

Claims (2)

[Claims] 1. A method for manufacturing a sintered product by sintering a molded product of a sintered material to produce a sintered product, and joining a plurality of sintered products to produce a joined product. Forming a convex portion on the surface of the body, sintering the molded body in a state where the convex portion is supported by a supporting material, and removing an extra convex portion after joining; Production method. 2. The method for manufacturing a joined product of sintered bodies according to claim 1, wherein the convex portion is formed in a flange shape at an edge of a molded body corresponding to a joint portion of the sintered body. A method for manufacturing a joined product of a sintered body.