JPS62111709A - Manufacture of bearing retainer made of synthetic resin - Google Patents

Abstract

PURPOSE:To form a deformable bearing inset retainer easily and inexpensively, by a method wherein a ball or a roller to either or which mold release material has been applied is mounted on the receiving part of a cavity half which is obtained by about halving by a parting line, the other cavity half is filled with a synthetic resin whose shrinkage factor is small along with possession of flexibility in the normal state by clamping the other cavity half. CONSTITUTION:A ball 7 to the whole surface in predetermined size of which a publicly known mold release agent has been applied is mounted no the whole of either one of semi-spherical recessed arts 2c, 4c, under a state of which mold clamping is performed by shifting a movable side die block 3 in the direction of an arrow and synthetic resin 8 which is in a molten state is cat within cavity halves 2, 4 through a sprue 1a and runner 3c in succession. When mold break is performed by separating the movable side die block 3 from a stationary side die block 1 to protrude an ejector pin 5 and runner ejector pin 6 after the lapse of a predetermined period of time, a synthetic resin part 8B gets out of the cavity half 4 and is taken out as a product separately from a synthetic resin part 8A.

Description

[Detailed Description of the Invention] [Field of Industrial Application] Conventionally, hair ring retainers have generally been made of metal. For example, in radial ball bearings, steel balls are placed between the outer ring and the inner ring at appropriate intervals. In order to arrange the steel ball in a rotatable manner, the steel ball is rotatably held by holding plates connected from both sides that correspond to the shape of the above-mentioned steel ball and having a width equal to or less than the distance between the inner and outer rings. It is known that both retaining plates are integrally connected by rehesoto or the like. Furthermore, in roller hair rings, it is known to use a metal plate with a large number of slits punched out in the shape of the steel rollers in order to hold the steel rollers at an appropriate distance between the outer ring and the inner ring. .

[Problem that the invention seeks to solve]

By the way, in the conventional bearings as mentioned above, in the case of ball bearings, the shape of the holding plate is complicated, and especially when the operating trajectory of the steel balls is elliptical, a divided holding plate is used instead of the holding plate. There are problems such as the need to use spacers, which makes manufacturing complicated and assembly time-consuming.In addition, in the case of roller bearings, special consideration must be taken to prevent burrs from occurring when punching slits. There was a problem with processing. In addition, various hair rings used in accurate and high-speed movement devices such as mouth robots and computer-related equipment these days are disliked because they make squeaks and noises when they operate, so these hair rings are difficult to compare due to the reasons mentioned above. It had to be expensive.

In view of the above-mentioned circumstances, the present invention forms a deformable bearing insert retainer easily and inexpensively by insert-molding balls or rollers using flexible synthetic resin. The purpose of the present invention is to provide a method for manufacturing a hair ring retainer.

[Means and effects for solving the problems] According to the method of the present invention, a part is formed of an annular part and a receiving part having a flange part that can hold parts of balls or rollers provided at a plurality of parts of the annular part. A ball or roller coated with a mold release agent is placed on the receiving part of the cavity half which is roughly divided into two by a molding line, and the other cavity half is mold-clamped to one cavity half on which the ball or roller is placed. A bearing retainer that can be extremely flexibly deformed with balls or rollers incorporated by filling it with a synthetic resin that is flexible under normal conditions and has a low shrinkage rate, and then protruding the product with a protruding member after the mold is opened. is manufactured.

〔Example〕

The present invention will be described in detail below based on an illustrated example of a molding die for carrying out the method of the present invention.
2 is a fixed side gui block having a sprue 1a, and 2 is a hemispherical concave portion 2c arranged corresponding to the annular portion 2a, a plurality of brim-like holding portions 2b arranged at predetermined intervals, and a cough holding portion.
and a cavity half 3 having a stripper plate block 3a and a movable plate 3b configured to be separable.
and a runner 3c', a movable side gui block consisting of a movable plate 3b and an integral core 3c, 4 is formed by a stripper plate block 3a and a core 3c, and is the same as the annular part 4a and the enclosing part 2b. A cavity half has a collar-shaped enclosing part 4b arranged at intervals and a hemispherical concave part 4c arranged corresponding to the enclosing part 4b, 5 is an eject turbine, and 6 is a runner protruding pin. in this case,
In the cavity half 2.4, when the fixed Goo block 1 and the movable Goo block 3 are joined, that is, when the molds are clamped, the pair of hemispherical recesses 2C, 4C align to define a complete spherical space. The cross section of the ejector pin 5 is circular or rectangular.

Next, a molding method using the above mold will be explained.

FIG. 1(A) shows the so-called mold-open state in which the mold is opened, and in this state, the hemispherical recess 2c.

A known mold release agent (for example, oil) is applied to the entire surface of a predetermined size on either one of 4c (4C in the drawing).

Balls (steel balls, etc.) coated with Teflon, silicone, etc. 7
1 (B)), and in this state, move the movable guide block 3 in the direction of the arrow to close the mold, and then move the mold into the cavity halves 2 and 4 via the sprue la and runner 3C. Inject synthetic resin 8 in a molten state into (
(See Figure 1(C)). In this case, the synthetic resin 8 is
A type of material (for example, 12 nylon) that is flexible under normal conditions, has a low shrinkage rate, and has excellent abrasion resistance is used. After a predetermined period of time has elapsed, as shown in FIG. 1(D), if the movable goo block 3 is separated from the fixed goo block 1 and the mold is opened, the inside of the cavity half 2 and the sprue l will be removed.
The synthetic resin 8 that has solidified inside the movable Goo block 3 and the runner 3c' is separated from the fixed Goo block 1 together with the movable Goo block 3. Next, the stripper plate block 3a is moved to the movable plate 3 together with the ejector turbine 5 and the runner ejection pin 6.
When separated from b, the synthetic resin halves 8A solidified within the sprue la and runner 3c' are separated from the synthetic resin halves 8B solidified within the cavity halves 2 and 4, as shown in FIG. 1(E). Next, when the ejector turbine 5 and the runner ejecting pin 6 are respectively ejected in the direction of the arrow as shown in FIG.
It escapes and is taken out as a product separately from the synthetic resin halves 8A. Thus, the ejector turbine 5. By retracting the launch protruding pin 6 and returning the stripper plate block 3a to the position where it joins with the movable plate 3b, the mold returns to the open state shown in FIG. 1(A), completing one cycle of operation. do. This embodiment has the advantage that the product can be easily ejected with a light ejection force of the ejector turbine 5.

As shown in FIG. 3, the product 8B taken out as described above has a flange-like enveloping portion 8B slightly raised from both surfaces of the annular portion 8Bl and the annular portion 8B, which are flexible and have excellent wear resistance.
A retainer for a radial pole bearing is obtained, which includes the balls 7 which are rotatably held in the cough holding part. In this case, since the surface of the ball 7 is coated with a mold release material in advance, it can be moved freely relative to the holding part 882, but since a part of the spherical surface is held by the holding part, the ball 7 is inadvertently shaped into an annular shape. It will not be separated from part 8B+. Therefore, handling is extremely convenient when assembling the bearing together with the inner ring and outer ring. Moreover, as mentioned above, this product 8B is flexible as a whole, and the ball 7 will not accidentally separate from the annular portion 8B, so it can be used as shown in FIG. 4. That is, in FIG. 4, G is a guide,
S is a slider in which a pair of products 8B are housed so that the annular parts 8B each draw an oval shape, and a plurality of balls 7 are in rolling contact with the inner wall surface of the guide G. In this case, the slider When S is pushed in the direction of the arrow, the ball 7, which comes into contact with the inner wall surface of the guide G, rotates on its own axis and moves into the annular portion 8B+.
The entire body can be moved in the direction of the arrow vJ, and can be moved very smoothly and easily along the guide G.

FIG. 5 shows another embodiment of the present invention, and this embodiment has the advantage that the mold structure of the movable side guide 3 is simplified and that the inside of the cavity half 2.4 is When the mold is opened after injection of the synthetic resin, a plurality of ejector turbines 5, 5 having a rectangular cross section and a runner ejecting pin 6 are used to separate the synthetic resin halves 8A and 8B and take out the product at once (see Fig. 5). This embodiment differs from the embodiment shown in FIG. 1 in the following points (see E).

That is, this embodiment differs from the embodiment shown in FIG. 1 in that the mold structure and the product molding process are simplified, but everything else is the same as the case shown in FIG. Therefore, the parts and halves of FIG. 1 are substantially larger than those shown in FIG.

FIG. 6 shows yet another embodiment of the invention.

In this embodiment, the runner 3a' is formed into two halves other than the core 3c so as to be suitable for producing a large number of products, and the ejector turbine 5 is configured as a sleeve slidably fitted into the core 3c. point and cavity half 2, 4
When the mold is opened after the synthetic resin is injected into the mold, the sleeve-shaped ejector turbine 5 and the runner protruding bin 6 are used to separate the synthetic resins 8A and 8B and take out the product at once (see Fig. 6 (E)). Although the embodiment differs from the embodiment shown in FIG. 1 in this respect, other configurations and functions are the same as in the embodiment shown in FIG. Only the reference numerals are given and detailed explanations are omitted. In the case of this embodiment, as is clear from the above explanation, since the ejector turbine 5 is sleeve-shaped, the ejector turbine hits the lower end surface of the synthetic resin half 8B uniformly over the entire circumference, so that the product There is an advantage that there is no risk of distorting the product or damaging the lower edge of the product when taking it out.

In the above examples, the case of manufacturing a radial ball bearing retainer has been explained, but by simply changing the shape of the cavity, a thrust ball hair ring retainer, a radial roller hair ring retainer, a thrust roller hair ring retainer, etc. can be produced. Various types of bearing retainers can be manufactured in the same manner, all of which are within the scope of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, hair ring retainers that can be used in an extremely wide range can be mass-produced at low cost, and various hair rings with extremely high performance without squeaking or operating noise can be provided at low cost. There are advantages.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing the manufacturing process of a ball hair ring retainer according to an embodiment of the present invention, and FIG.
A) is a plan view along line nn, FIG. 3 is a perspective view of a ball bearing retainer manufactured by the method of the present invention, and FIG. 4(A) is a retainer for a ball hair ring manufactured by the method of the present invention. FIG. 4(B) is a sectional view taken along the line B-B in FIG. 1(A), and FIG. 5 is a partially cutaway plan view showing a special usage example of the ball bearing according to another embodiment of the present invention. FIG. 6 is a sectional view of a main part showing a manufacturing process of a retainer. FIG. 6 is a sectional view of a main part showing a manufacturing process of a ball bearing retainer according to still another embodiment of the present invention. 11.・Fixed side Gui block, 2.4... Cavity half, 3... Movable side Gui block, 5.・・・
・Eject turbine, 6...Runner ejection pin, 7
...Ball, 8B...Synthetic resin bisection (product),
8B... annular part, 8BZ... enclosing part. Figure 1 (A) (B)'I! 1
Figure (E) (F) (A) Figure 5 (A) (B) Figure 5 (D) ・(E) Cleaning of the two sides No change) Figure 6 (D ) (E) Six Procedural Amendments (Spontaneous) December 12, 1985 1, Indication of Case Patent Application No. 1988-252461 4,
Agent 19 Shinbashi 5-5, Minato-ku, Tokyo 105 Telephone Tokyo (432) 4576 (6582) Patent attorney Yasushi Shinohara 5 Drawings to be amended 6 Contents of amendment Procedural amendment (voluntary) 1988 2 July 10th, 1, Title of the invention: Manufacture of synthetic resin hair ring retainer 195-195, Shinbashi, Minato-ku, Tokyo 1.05, Supplement 16, Contents of amendment (1) ゛Description No. "Nylon 12" in the first line of page 6 has been corrected to "nylon, polyurethane, polyester elastomer." (2) After "retainer" on page 10, line 9 of the specification, insert the retainer J for the cross roller hair ring. (3) r on page 10, line 10 of the specification. Insert "J" after "I can do it", and pinpoint date can also be used in the gate method.

Claims (1)

[Claims] Applying a mold release material to the receiving part of the cavity half, which is formed by an annular part and a receiving part having a flange part that can hold parts of balls or rollers provided at multiple locations thereof, and is roughly divided into two by a parting line. Place the ball or roller that has been
One cavity half on which the balls or rollers are mounted is clamped with the other cavity half, and a synthetic resin which is normally made of flexible material and has a low shrinkage rate is filled, and after the mold is opened, the product is ejected using a protruding member. A method for manufacturing a synthetic resin bearing retainer in which balls or rollers are rotatably inserted.