JPS60177518A - Method of producing composite molded article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for manufacturing a composite molded article.
The present invention relates to a method for manufacturing a composite molded product in which a sliding type switch or the like in which one molded product has low sliding resistance can be formed by combining and molding resin molded products.

(Background Art) Conventionally, various composite parts that combine metal parts, resin molded parts, etc. have been provided. In manufacturing this type of composite part, insert molding is used, for example, a method of molding a resin into a metal part, or a method of inserting and fixing a metal into a resin. In addition, in the type of sliding type switches where one part slides against the other, a gap is created between the parts by utilizing the contraction of the resin molded inside the metal part. In this way, a sliding function is provided between the parts, or by pre-molding the necessary parts individually with resin and assembling them in a separate process.

However, these methods generally require multiple parts to be manufactured and assembled through independent processes,
There are disadvantages in that it requires a large number of manufacturing steps, is complicated, and requires a large amount of mold cost. In addition, sliding type switches tend to have large sliding resistance due to dimensional errors in individually molded parts, and have drawbacks such as poor operability. was.

(Object of the invention) The present invention has been proposed to solve the above-mentioned drawbacks.
The purpose of this is to simplify the manufacturing process and reduce mold costs for composite molded products made by combining multiple resin molded products. An object of the present invention is to provide a method for manufacturing a composite molded product that facilitates the manufacture of a swiftlet or the like.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

1 and 2 show an embodiment of the present invention,
First, as shown in FIG. 1, a first molded product 1 in the shape of a rectangular tube with a low height as shown in FIGS. 3 and 4 is injection molded using an upper mold A and a lower mold B. As shown in FIGS. Next, as shown in Figure 2, the lower mold B
The second molded product 2 is injection molded using the upper mold A', leaving the first molded product l as it is. This f! 42 molded product 2 has 7272 portions at both ends in the height direction as shown in FIG. 2g and 2b are provided.

Moreover, as is clear from FIGS. 3(A) and 4(A), depending on the shape of the upper molded person, the hollow portion 1a of the first molded product 1
The inner surface of the second molded product 2 expands along the sliding direction (the third
It is formed in the tapered surface 1b so as to be narrowed (see FIG. 4(a)) or constricted (see FIG. 4(4)). In other words, by molding the second molded product 2 as described above at the end where the chewing surface 1b is the narrowest, the second molded product 2 can be formed as shown in FIG. 3 (A) or after molding. No matter where it is slid in the direction of the arrow shown in FIG. 4 (a), a gap will be maintained between the chip and the base surface ib, in other words, the sliding resistance of the second molded product 2 will be extremely high. It can be reduced.

In addition, when performing composite molding of resin molded products as in the present invention, it is necessary to prevent the molded products from fusion together. To this end, it is necessary to select the type of resin that is difficult to fuse (same type, different type), as well as optimal molding conditions (for example, the first molded product 1 is molded at high pressure, and the second molded product 2 is molded at as low pressure as possible). (e.g.), it is necessary to take advantage of the difference in resin contraction. −
As an example, when the first molded product 1 and the second molded product 2 are both made of Shuracon (polyacetal), the first molded product 1 is formed at an injection pressure of around 60Or-tcy/nutt:+,
Further, the second molded product 2 is molded at an injection pressure of around 100 (k≠d).Also, as another example, the first molded product I may be formed of polycargenate, and the second molded product 2 may be formed of Duracon. It is valid.

Furthermore, the position of the dart during molding of the second molded product 2 must be kept as close as possible to the edge portion of the first molded product 1, as shown in FIG. The distance t between the edge portions of 1 and 1 should be at least 1 [1], and the radius of the edge portions should be 0.5 [1].
1fi) ii It is necessary from the viewpoint of preventing fusion.

Next, FIG. 6 shows the present invention in a quartz timer
-11 This shows an example of application to an hour setting mechanism, and as shown in the same figure (A), the rotation center is set as the second molded product 2' for the dial board as the first molded product 1'. It is formed to be rotatable around 2 cl. In addition, as shown in FIG. 3(b), the first molded product 1' has a chi i4? along the thickness direction. The surface lb' is formed so that the sliding resistance becomes smaller along the rotational direction of the second molded product 2'.

According to this example, since the molded products 1' and 2' are molded in a composite manner and integrally, troubles such as loss of component parts, such as setting elements, or installation errors are eliminated, and assembly time is reduced. This is not necessary, and furthermore, it can be expected to have effects such as homogenization of component quality.

(Effects of the Invention) As described above, according to the present invention, a composite molded product is obtained by molding a - molded product with resin, and combining it with this molded product to mold another movable molded product with resin. In this method, each molded product is molded so that the molded product on the − side has a chi/19 surface such that the gigang between it and the molded product on the − side increases as the molded product on the side moves. Therefore, since a plurality of molded products can be consistently and almost simultaneously composite molded, assembly man-hours and time can be reduced, and the manufacturing process can be simplified.

Furthermore, since the first molded product plays the same role as the mold, it is possible to indirectly reduce the cost of the mold.

This has the effect that a switch with good operability can be easily obtained by reducing dynamic resistance.

[Brief explanation of drawings]

1 and 2 are cross-sectional explanatory diagrams of a mold showing one embodiment of the present invention, FIG. Figure 4 (B) is also a central vertical sectional view, and Figure 5 (A) is the C in Figure 3 (0).
FIG. 5(B) is a right side view of FIG. is a sectional view taken along the line D in FIG. 1, 1'-first molded product, 1a-hollow part, lb, l
b'... Theno matrix surface, 2.2'... Second molded product, 2
m, 2b...flange part, 20'...rotation center, a...dart position, b...edge part, A, A
'...Top mold, B, B'...Bottom mold. Fig. 1 Fig. 2 Fig. 3 Fig. 1 Fig. 5 Procedural Notes (spontaneous) July 31, 1980 Manabu Shiga, Commissioner of the Patent Office 1, Indication of the Case 1982 Patent Application No. 328 -11 No. 2, Name of the invention Method for manufacturing composite molded products 3, Relationship with the amended case Patent applicant name (583) Matsushita Electric Works Co., Ltd. 4, Agent 160 Address Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 7-5-10, 2nd Mizota Building, 7th Floor, 6, Details of the Amendment As shown in the attachment 1, page 3, line 17 of the specification, ``Index molding'' and ``
Insert the following sentence between "this". [Although not shown, in this case, the first molded product 1
is re-set in another mold and used as part of the mold,
This may be a method of injection molding the second molded product 2. ”

Claims (1)

[Claims] In a composite molded product in which one molded product is molded with resin and combined with this molded product, another movable molded product is molded with resin, the above-mentioned -
Theno 9 has a large gap between it and the molded product.
A method for manufacturing a composite molded product, characterized in that each of the molded products is molded so that the surface is held by the molded product.