JPS5836411A - Outsert molded product - Google Patents

Abstract

PURPOSE:To obtain a light-weight molded item that would not warp, by using an aluminium (alloy) plate for a metal base and a resin having approximately the same coefficient of thermal expansion as the metal plate at room temperature in an outsert molded item wherein resin components are secured on several points of the metal base plate. CONSTITUTION:In an outsert molded item such as a VTR chassis wherein preciseness and excellent dimensional stabilities are required, a light metal plate such as an aluminium plate or aluminium alloy plate is used for the metal base plate 1, a plurality of holes 2 are drilled through the metal base plate 1, and functional sections 4 of a resin are arranged. As the resin, use is made of a resin having approximately the same coefficient of thermal expansion as that of the used light metal plate at room temperature, for example, one having the coefficient of thermal expansion of 1.8-2.9X10<-5>/ deg.C that can be prepared by adding an inorganic filler to a phenolic resin, an unsaturated polyester resin, an epoxy resin, a polyphenylene sulfide resin, a polycarbonate resin, a polyacrylate resin or a polyester sulfonic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outsert molded product, and in particular, the chassis of a video tape recorder is hereinafter referred to as a VTR chassis. )
etc., related to outsert molded products that require precision and excellent dimensional stability.

The VTR chassis has a number of parts, and depending on the location of the protrusions (resin functional parts), the perpendicularity to the reference plane (metal board surface), the parallelism between the protrusions, and their deformation over time. High precision is required.

However, a chassis using a steel plate has the problem of making the VTR heavier, and the difference in thermal expansion coefficient between the steel plate and resin is too large, causing the chassis to warp due to thermal stress, or to cause damage to the resin functional parts or between the resin functional parts. There is a problem in that cracks occur at the connecting launch part. In addition, due to the demand for flame retardancy in home appliances, when flame retardant additives (mainly halides such as iron chloride) are added to the resin used for outsert molding, the additives generate decomposed gas during molding. There is also the problem of corroding the steel plate.

SUMMARY OF THE INVENTION An object of the present invention is to provide an outsert molded product which eliminates such conventional drawbacks and effectively prevents warping of a metal substrate.

The present invention is characterized in that the metal member of the outsert molded product is selected from aluminum and aluminum alloy.

Embodiments of the present invention will be described below with reference to the drawings.

A plurality of through holes 2 are appropriately arranged in a substrate 1 made of aluminum-silicon alloy and having a thickness of 1 m. The peripheral edge of the substrate 1 is bent to form a reinforcing lip 3. A resin functional part 4 is arranged in each through hole 2. The resin functional parts 4 are molded into various shapes according to their unique functions, for example, a cylindrical body 4.
1 and a columnar body 42. The resin functional parts 4 are connected to each other by runners 43 as necessary. In addition, each resin functional part 4 is composed of a resin flange part 44 and a protruding part 45, and the aluminum substrate is
is fixed to.

The reinforcing lip 3 is a part that gives strong tonality to the thin substrate 1 of IIWI thickness. Of course, it is also possible to increase the tonality by increasing the thickness of the substrate 1, as shown in FIG. 3, and to eliminate the reinforcing ribs 3. It is also effective to form a step 31 in the center of the substrate as shown in FIG. 4, or to form a raised portion 32 in the center of the substrate by press working as shown in FIG. Also, Fig. 6.

If the board is obtained as a die-cast product as shown in Figure 7,
It is also easy to form the reinforcing ribs 3 and the thick portions 33 in place of the reinforcing ribs 3. Of course, the number, length, and shape of the reinforcing tubes 3 and parts having equivalent functions are selected as appropriate depending on the material and thickness of the board, the loaded weight and shape of other parts, the piping, etc.

In this example, the resin functional part 4 is made of a resin composition made of an epoxy resin with an inorganic filler added (the coefficient of thermal expansion is 2.9 at room temperature).
It was confirmed that the dimensional stability was excellent when left between the fluff and the fluff.

Suitable inorganic fillers include quartz glass powder and glass powder. The inorganic filler is effective in adjusting the coefficient of thermal expansion of the resin composition and improving the clip resistance of the molded product. Depending on the type of resin (mostly thermoplastic resins), no inorganic filler may be added.

It should be noted that other resin compositions can be selected as appropriate, but if the coefficient of thermal expansion with the metal substrate is taken into consideration, then heat 11 = 5J! “I
'.

It is best to use a resin with a diameter of 1.8 to 2.9 x 10'' (1/C) at room temperature.In addition to epoxy resins, examples of resins used in such resin compositions include phenolic resins. -Leff,
Thermosetting resins such as 1 fat, unsaturated polyester resin, boria 7 tar 1 fat, A B S =, ? i finger, 1':
+) Thermoplastic resins such as phenylene sulfide resin, polycarbonate resin, +411 acrylate resin, and polyether sulfono are suitable.

In addition, in this example, aluminum, -71157
Although the alloy substrate 1 is used, other aluminum alloy plates or aluminum plates may be used.

By the way, if you compare the materials of each material's substrate and steel plate, the first
As shown in the table.

As described above, the outsert molded product of this example is a molded product that is F^Hatake and has excellent process stability, is lightweight, and is free from corrosion.

Examples of resin compositions for the functional parts 4 are listed in Table 2 along with their respective coefficients of thermal expansion. still,
Ingredients are shown in parts by weight.

Table 2 As is clear from Tables 1 and 2, the constituent members of the outsert molded product of the present invention, that is, light metals such as aluminum, and resin have similar coefficients of thermal expansion, and therefore the molded product will warp. This solves the cracking problem. That is, according to the present invention, it is possible to obtain a molded article that is precise, has excellent dimensional stability, and is lightweight. Moreover, corrosion occurs on the metal substrate.

You can also get the side effect of eliminating problems in your life.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the outsert molded product of the present invention, Fig. 2 is a sectional view taken along line a-a of Fig. 1, and Fig. 3 is a modification of Fig. 1 of Fig. 2. The a-a cross-sectional view and FIGS. 4 to 7 are all cross-sectional explanatory views showing modified examples of the Kaniso substrate. DESCRIPTION OF SYMBOLS 1... Board, 2... Through hole, 3... Reinforcement rib, 4
...Resin Figure 1 Figure 2 Figure 4 Figure 1'' Figure 5 Figure 2 Figure 6 Figure q

Claims (1)

[Scope of Claims] 1. In an outsert molded product in which resin functional parts are fixed to a plurality of locations on a metal substrate, the metal substrate is a light metal plate selected from an aluminum plate and an aluminum alloy plate, and the resin An outsert molded product characterized in that the coefficient of thermal expansion of the resin in the functional part is similar to that of the light metal plate at room temperature. 26 The light metal plate is an aluminum plate or an aluminum alloy plate, and the resin material of the resin functional part has a coefficient of thermal expansion of 1.8 to 2.9X10-5 (1/T) at room temperature. An outsert molded product according to claim 1. 3. The resin composition forming the resin functional part is a phenol resin, an unsaturated polyester resin, an epoxy resin, a polyphenylene sulfide resin, a polycarbonate resin,
The outsert molded article according to claim 1 or 2, characterized in that it is a resin selected from polyacrylate resin and polyester sulfone resin mixed with an inorganic filler. 4. The first aspect of the present invention is characterized in that the resin forming the resin functional part is selected from polycarbonate, rifhenylene sulfide resin, polycarbonate resin, polyacrylate resin, and polyether sulfone resin. The outsert molded product according to any one of items 1 to 3. 5. A metal substrate having a plurality of through holes at predetermined positions;
In an outsert molded product comprising a resin functional part that is fixed to the metal substrate at the same time as molding using the through hole and/or using molding shrinkage between the resin and the metal, the metal substrate is an aluminum plate or It is an aluminum alloy plate, and the coefficient of thermal expansion of the resin at room temperature is 1.8 to 2.
．． An outsert molded product characterized by having a size of 9 x 10"(1/lll").