JPS59193712A - Production of semispherical body - Google Patents

Abstract

PURPOSE:To improve the life of dies and to produce easily a semispherical body with high accuracy by using a bottom die having a semispherical concave surface and a top die formed with a plane surface contrasting with said surface and pressing a spherical body finished to high dimensional accuracy by means of such dies. CONSTITUTION:A steel ball 11 which has the same volume as the volume of a desired semispherical body 25 and is finished to the high dimensional accuracy equivalent to the diameter and out of roundness of a steel ball, etc. for a ball bearing prior to hardening is put into dies 18 constituting of a bottom die 13 formed with a semispherical concave surface 12 on the top end face and a top die 17 formed with a tray-shaped recessing surface 16 having a circular plane 14 recessed on the top end face and a tapered surface 15 in the outside circumferential part thereof, then the dies 17, 13 are approached to each other to compress the ball 11. Both dies 17, 13 are spaced from each other and a knock-out pin 19 is lifted to obtain the semispherical body 25 having a top surface 23 consisting of a plane surface 20 and a tapered surface 21, a semispherical surface 24 having good surface roughness and a height H of high accuracy.

Description

Detailed Description of the Invention: 1. The present invention relates to a method for manufacturing a hemisphere such as a footrest by pressing, and in particular, it is easy to manufacture by compressing a sphere r to obtain a hemisphere 'f'. The objective is to manufacture a hemisphere with good moldability, dimensional accuracy, and narrow surface roughness.

As shown in Fig. 1, the conventional hemisphere manufacturing method is as follows:
A sphere 1 (Fig. 1 (A)) having a spherical surface identical to that of the hemisphere obtained in advance and constructed with high precision is prepared, and this sphere 1 is used as a grinding machine using an electromagnetic chuck, etc. The upper half is ground with a grindstone or the like to form a flat surface 2 (Fig. 1(B)), and then chamfered to produce the hemisphere 6 shown in Fig. 1(C). method and
As shown in Figure 2, cut the bar or coil material and
r”!J 1 The mud that forms the cylindrical body 4 of the heather 2 (A))
This is vertically inserted into a die 9 consisting of a lower mold 6 having a hemispherical concave surface 5 formed thereon and an upper mold 8 having a flat surface 7 formed thereon as shown in FIG. death,
Thereafter, as shown in FIG. 2(C), the upper mold 8 is moved to the lower mold 6 with a fixed volume of 1 ml, and the cylindrical body 4 is compressed 1 to form a hemisphere 6, and then the knockout pin 1U Raise the hemisphere 6 and remove it from the die 9 (Figure 3 (1))
The press force method for obtaining the desired hemisphere 6 shown in FIG.

However, in the case of the former grinding method, the sphere 1 has to be ground by 100 degrees, so the grinding time is long, which is not suitable for mass production, and chips are wasted, reducing the grinding yield. , Furthermore, the next surface roughness of the flat surface 2 and the taste I-
It has the disadvantage that it is extremely difficult to finish 1a with high precision.

However, when using the latter press processing method, it is possible to improve the material yield because there is no need to perform iris cutting, and the processing time is short, making mass production possible.
It is difficult to position the cylindrical body 4 vertically at the center position 1d within the die 9, and when the cylindrical body 4 is compressed by the lower die 8 and the lower die 6, the sharp lower edge of the cylindrical body 4 Is it in the hemispherical concave rm5 of the lower mold 6? Since there is close contact,
The concentration of stress at this tangential position shortens the life of the mold, and furthermore, it is difficult to cut the cylindrical body 4 at a constant value with the body at(r constant), so polishing to make the height uniform is necessary. Moreover, when the cylindrical body 4 is compressed to form the hemisphere 6, pars that extend into the gap between the lower die 6 and the upper die 8 are likely to occur, and a reserve of 1ν1−@ for this paris removal is also required. Is it difficult to easily shape a hemisphere? % 4'W degree work''-
It has disadvantages such as not being able to be used, so it is rare.

Therefore, this invention solves the disadvantages of the conventional method.
The purpose of this method is to provide a method for manufacturing a hemisphere that can easily manufacture a hemisphere with high precision and improve mold life.

That is, as shown in FIG.
Upper mold 1 having a smooth surface + r j 14 for forming 0
Insert the finished sphere 11 with cylindrical dimensional accuracy into a die 18 formed from 7 and 7, and then move at least one of the upper mold 17 and the lower mold 16 close to the other to press-form the sphere 11. This relates to a 5A method of disposing a hemisphere, which is characterized by forming hemispheres 25 and 25'.

Finally, we will read this chapter based on the diagram h+ij 11/U in FIG.

As shown in Fig. 3 (A), a receiving steel ball 11 is prepared, without being cut, as shown in Fig. 3 (A). . in this case,
The volume of the steel ball 11 is selected to be equal to the volume of the intended hemisphere 25.

Then, as shown in M 3 ill (1:l),
Lower 2 with a hemispherical concave surface 12 formed on the upper end surface! i! ! 15 and
A circular smooth surface 14 forming a concave flat surface on the lower end surface, and a circular flat surface 14 extending from the external chest to the lower end surface are connected to form four dish-shaped surfaces 16. The steel sphere 11 is squeezed using a die 18 composed of the following. That is, as shown in FIG. 3(B), the upper mold 17 and the lower mold 16 face each other with a gap that is at least large enough to insert the steel ball 11 (in this case, the lower mold 16 is fixed, On the other hand, the upper die 17 can be moved forward and backward by a drive mechanism.) In this state, lower mold 1
Steel balls 11 are inserted one by one into the hemispherical concave surface 12 of No. 6 using an appropriate loader machine. At this time, the steel ball 11 is
Since it is inserted into the hemispherical concave surface 12 of No. 6, it is pushed into the center position of the four hemisphere surfaces 12 without any positioning.

Next, the upper mold 17 is lowered to the floating rock 11, and the steel ball 11 is pressed down as shown in FIG. 3(C). −j
-ru.

Thereafter, the upper mold 17 is raised, and then the knockout pin 19 is raised to take out the hemisphere from the die, and the upper surface 26 having the intended flat surface 20 and tapered surface 21 shown in FIG. , it is possible to obtain a hemisphere 25 having a hemispherical surface 24 and a hemispherical surface 24.

For the first time, by inserting a new 1i sphere 11 into the die 18 and repeating the same operation as above, the hemisphere 2
5) can be manufactured in a similar manner.

In this way, if all the steel balls for ball bearings before quenching are used to form the hemisphere 25, the dimensional silkiness can be increased as shown in FIG. Since there is no need to use finished spheres, there is an advantage that the number of processing steps can be reduced. Still, ball 111Ij-favorite steel ball is diameter 2 size■
Because the roughness and sphericity are finished to a perfect degree, when the semi-concave part of the lower mold 16 is inserted, the position in the upper part of the lower mold 16 will cause pressure, force, and force. Not only is it easy to control, but the steel ball deforms during squeezing! Since the texture is uniform without being uneven, it prevents the production of defective products, and there is no formation of cracks during pressing, and the difference in texture on the sub-micron level and the deliciousness1] are improved. <fj
It has the advantage that it can be secured to W.

In the above embodiment, the case of manufacturing a hemisphere made of steel was explained, but it is possible to manufacture hemispheres made of various materials by arbitrarily selecting the material of the cumulative moon to be renewed. Of course.

A hemisphere is not limited to a complete hemisphere in which a sphere is divided into two at the center position, but also a hemisphere cut at a position offset from the center position, or a hemisphere in which a hemisphere part and a cylindrical part are formed. A hemispherical body, a hemispherical body with a part of the hemispherical surface made flat, etc., can also be manufactured by changing the concave shape of the lower mold and/or upper mold of the die 18.

Furthermore, the flat upper world 2 omitting Taber-i1]]21
To make a tray-shaped hemisphere 25' having a diameter of 6, as shown in FIG. A cylindrical projection 28 that is fitted into the surface 27 may be formed.

The hemisphere manufactured as described above may be used, for example, in a swash plate compressor as shown in FIG. That is, the swash plate compressor includes a swash plate 31 fixed to a rotating shaft 60 in a housing 29, and has a handle in which a piston 62 is attached to the swash plate 61. The piston 62 is reciprocated in the axial direction in response to this. Then, the hardened hemisphere 25 is inserted into the hemispherical surface 25 at the position where the swash plate 61 and the piston 32 are engaged.
is received by the piston 62 and slidably fitted onto the flat i+4'' 20r swash plate 61. The reason why this hemisphere 25 is conveniently used is that in a normal swash plate type compressor, a steel ball and a shoe crowned on a part of the spherical surface are inserted between the swash plate 61 and the piston 62. By making the steel ball semi-hard, the diameter of the steel ball in the axial direction is shortened, and the shoe length is 1.
This is because the axial length of the consolenosa can be shortened accordingly, resulting in a Noh performance.

As is clear from the above, according to the present invention, since the sphere is compressed to form a hemisphere, the loss of raw materials is reduced and the processability is significantly improved compared to the conventional example. Moreover, since the sphere used as the moon is finished with high dimensional accuracy, the cylindrical shape, sphericity, surface roughness, etc. of the molded hemisphere can be maintained at high precision. can. 1. The manufacturing process is extremely simple, as all you have to do is place the sphere inside the die, squeeze it, and then take it out of the die. Furthermore, you can simply insert the sphere into the hemispherical concave surface of the lower die, and the center of the sphere can be pressed. Since the parts are positioned at the same location, the defective rate can be extremely reduced and mass production can be achieved. Furthermore, when squeezing the sphere,
The hemispherical concave surface of the lower mold is in contact with the spherical surface of the sphere, and unlike the case where the sharp outer end surface is in contact with the spherical surface, the concentration of stress is reduced slowly, so it is possible to have a long time in the mold. One effect such as being able to do it.

[Brief explanation of the drawing]

Figures 1 (A) to (C) are process diagrams for explaining a conventional hemisphere manufacturing method, and Figures 2 (5) to (D) are process diagrams for explaining another conventional hemisphere manufacturing method. Figure, Figure 3 GA)~
(])) is a process diagram for explaining the method of manufacturing a hemisphere according to the present invention, FIG. 4 is a front view showing another example of the die, and FIG. FIG. 2 is a sectional view showing a μ-type compressor. 11... Steel ball, 12... Hemispherical concave surface, 16... Lower mold, 1
4...Smooth ■, 17...Upper mold, 18.Dice, 25
．． 25' hemisphere. Patent applicant Shin Nippon Steel Sphere Type Company agent ff patent attorney Momoya Mori Yen
Masaru Fuji, Masashi Shimizu

Claims (2)

[Claims] (1) In a die formed from a lower mold having at least a hemispherical concave surface and an upper mold formed by pairing the semispherical concave surface with a smooth surface for forming at least a flat surface, A hemisphere 1+ whose characteristic is to form a hemisphere by inserting a sphere finished with dimensional accuracy and then compressing the sphere by moving close to it with the force of at least one of the upper mold or the lower mold. Installation method. (2) The method for manufacturing a hemisphere according to claim 1, wherein hardened ILJ ball bearing steel balls are used as the spheres.