JPS6111206A - Compression molding and mold therefor - Google Patents

Abstract

PURPOSE:To prevent molding material from slipping down and defectives from occurring by providing several catch-holes on the molding surface of the fixed mold and catching the molding material to the catch holes before the movable mold is set to the fixed one. CONSTITUTION:Downward stretching catch holes 4 are provided at several places on the molding surfaces 2a of the projecting section 2 of the fixed mold 1. The fixed mold 1 and the movable mold 5 are preheated to 140-160 deg.C. The molding surface 2a is charged with molding material M, and the molding material M is compressed and forced partially into the catch holes 4. Hereby, places charged with molding material M can be fixed by anckoring effect and the fixed mold 1 is prevented from slipping down from the molding surface. When the movable mold 5 is set to the fixed one 1, the molding material M is heated, compressed into a mold, begins gelling and the abutting sections 3, 7 of both fixed and movable mold 1, 5 abut on each other, while the molding material M is compressed into the shape of the molded piece and hardened completely. M shows the molding material of sheet molding compound composed of glass fiber, calcium carbonate, unsaturated polyester resin, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for compression molding a molding material consisting of a sheet molding compound and a mold for the same.

[Prior art]

Conventionally, parts such as over fenders and fender garnishes that are attached to automobile fenders have been used as seats and
When molding with a molding material made of a molding compound, a compression mold as shown in the schematic cross-sectional view of FIG. 4 is widely used.

In FIG. 4, 41 is a fixed type, and this fixed type 4
A convex molding surface 42 inclined to one side is formed on the upper surface of the molding member 1, and a contact portion 43 consisting of a flat surface and an inclined surface is formed around the molding surface 42.

Furthermore, a movable mold 44 is disposed at a portion facing the fixed mold 41, and a concave molding surface 45 that opens toward the fixed mold 41 is formed on the lower surface of the movable mold 44, and a flat surface and an inclined surface are formed around the movable mold 44. A contact portion 46 consisting of a surface is formed. and,
When the fixed mold 41 and the movable mold 44 are closed together, the convex molding surface 42 formed on the fixed mold 41 is fitted into the concave molding surface 45 formed on the movable mold 44, and both molds 41
．． The contact portions 43 and 46 of 44 contact each other, and
A molding space is formed by the molds 41 and 44.

When compression molding parts such as over fenders and fender garnishes, a fixed mold 41 and a movable mold 44 are used.
Preheat to 140℃ to 160℃,
When both molds 41 and 44 are closed, the movable mold 44
is released from the fixed mold 41. Next, a molding material M of a sheet molding compound made of glass fiber, calcium carbonate, unsaturated polyester resin, etc. is charged onto the inclined molding surface 42 formed on the fixed mold 41. Thereafter, the movable mold 44 is closed to the fixed mold 41, and compression molding is performed while heating the molding material M with both molds 41 and 44.

However, in such a compression molding mold, since the molding surface 42 formed on the fixed mold 41 is inclined, after the molding material M is charged onto the molding surface 42, the molding material is heated by the fixed mold 41. The contact surface of M with the stationary mold 41 is molten and a sol phenomenon occurs. For this reason, the movable type 4
4 may slide down along the slope of the molding surface 42 before it is closed to the fixed mold 41, and it may deviate from the normal charging position, causing molding defects, and in the worst case, the molding material M may fall off the molding surface. There is a problem with falling from the surface 42.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a plurality of latching holes in the molding surface of a fixed mold, and to apply molding material to the molding surface before closing the movable mold to the fixed mold. It is an object of the present invention to provide a compression molding method and a mold for the compression molding method, which can prevent the molding material from slipping off the molding surface and prevent the occurrence of molding defects by latching the molding material into the latching hole.

[Structure of the invention]

In order to achieve the above object, the composition of the compression molding method according to the present invention is such that a sheet is formed on a molding surface formed in a fixed mold.
When charging a molding compound consisting of a molding compound and compressing the movable mold by closing it with a fixed mold, the molding compound is pressed into the latching holes in the molding surface formed in the fixed mold, and then the movable mold is Molding is done by closing the mold into a fixed mold.

Furthermore, the composition of the compression molding mold according to the present invention is such that a molding surface for charging a molding material made of a sheet molding compound is formed on the surface of a fixed mold, and a molding surface of the fixed mold is formed in a portion facing the fixed mold. A compression molding mold is provided with a movable mold having a molding surface that fits into the molding surface, the molding mold charging the molding material of the fixed mold, and the molding surface of the fixed mold having a concave shape on which the molding material is latched. A plurality of latching holes are formed.

The shape of the latching hole formed in the molding surface of the fixed mold is not particularly limited, and may be formed into a circular shape such as an ellipse, or a polygonal shape such as a triangular, square, triangular, hexagonal, etc. It is desirable to form these well within the range permitted by the appearance, plate thickness, etc. of the molded product. Furthermore, there is no fixed limit to the amount of recess from the molding surface of the latching hole, and it is desirable to make it as deep as possible, taking into consideration, for example, the thickness, appearance, strength, etc. of the molded product.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic cross-sectional view of a compression molding mold according to the present invention, and FIG.
The figure is a plan view taken along the line nn in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the area A in FIG. 1.

In FIGS. 1 to 9, 1 is a fixed mold, and a molding convex portion 2 extending upward is formed in the center of the upper surface of the fixed mold 1, and the surface thereof is molded with a slope to one side. This is surface 2a. Furthermore, a contact portion 3 consisting of a flat surface and an inclined surface is formed around the molded convex portion 2 .

Furthermore, the molding surface 2a of the molding convex portion 2 is provided with six latching holes 4 extending downward, and the shape thereof is rectangular. The size of the latching hole 4 is 3c11×3CIIO, and the depth of the latching hole 4 is about 31 mm.

In addition, a movable mold 5 is provided at the upper part, which is the part facing the fixed mold 1.
A molding recess 6 that opens downward is formed in the center of the lower surface, and the upper part thereof is a molding surface 6a. Further, a contact portion 7 consisting of a flat surface and an inclined surface is formed around the molded recess 6. and,
・When the movable mold 5 is closed to the fixed mold 1, the fixed mold 1
The molding convex portion 2 formed on the movable mold 5 is fitted into the molding recess 6 formed on the movable mold 5, so that the contact portion 3 of the fixed mold l and the contact portion 7 of the movable mold 5 abut each other, and both A molding space is formed by the mold 1.5. Incidentally, M is a molding material of a sheet molding compound made of glass fiber, calcium carbonate, unsaturated polyester resin, etc. charged on the molding surface 2a of the fixed mold 1.

In the compression molding mold configured as above, parts such as an overfender and a fender garnish (not shown)
We will explain how to compression mold.

First, the fixed mold 1 and the movable mold 5 are heated by heating means such as a heater (
(not shown) to 140 DEG C. to 160 DEG C., and when the movable mold 5 is aligned with the fixed mold 1, the movable mold 5 is released from the fixed mold 1.

Next, in this state, the molding surface 2a formed on the hard mold 1
Then, charge the molding material M.

Next, as shown in FIG. 3, the molding material M charged on the molding surface 2a is pressed by the rod member 8 manually or automatically, so that the molding material M partially bites into the latching hole 4. . This provides an anchor effect to fix the charging position of the molding material M, and prevents the fixed mold 1 from slipping off the molding surface. At this time,
If it is determined that the molding material M is not well penetrated into the latching hole 4, the molding material M is further pressed.

Subsequently, the movable mold 5 is closed to the fixed mold 1.

At this time, the molding convex portion 2 formed on the fixed mold 1 is fitted into the molding recess 6 formed on the movable mold 5, and the contact portion 3 of the fixed mold 10 and the contact portion 7 of the movable mold 5 face each other. Fit. As a result, the molding surface 6a of the movable mold 5 comes into contact with the molding material M, and as pressure is applied, the molding material M softens and begins to fluidize.

Then, the molding material M is compressed and molded while being heated and begins to gel, and the abutting portions 3.7 of both molds 1.5 abut against each other, being compressed into the shape of the molded product and completely hardened.

Thereafter, the movable mold 5 is released from the fixed mold 1 to open the molded product portion, and the molded product is removed from the molding surface 2a of the fixed mold 1.

〔Effect of the invention〕

As explained above, according to the compression molding method and its molding die according to the present invention, a plurality of latching holes are provided in the molding surface of the fixed mold 1, and the molding material is removed before the movable mold is closed to the fixed mold. Since the molding material is latched to the latching hole in the molding surface, it is possible to prevent the molding material from shifting from the molding surface or falling from the molding surface.

Furthermore, the present invention has the effect of preventing the molding material from slipping off the molding surface, thereby preventing the occurrence of molding defects in the molded product.

Furthermore, the present invention has the effect of significantly improving the yield of molded products during compression molding by preventing the occurrence of molding defects.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a compression molding mold according to the present invention. FIG. 2 is a plan view taken along line nn in FIG. 1. FIG. 3 is an enlarged sectional view of the inside of section A in FIG. 1. FIG. 4 is a schematic cross-sectional view of a conventional compression molding die. 1-・----Fixed mold 2--Molding convex part 2a--Molding surface 3--Contact part ゛4--Latching hole 5-- ---Movable mold 6...--Molding recess 5 a--Molding surface 7...--Abutting portion 8...--Bar member M-・-・Molding material Fig. 1 Fig. 2

Claims (2)

[Claims] (1) The molding surface formed on the fixed mold is charged with a molding material made of sheet molding compound, and the movable mold is closed to the fixed mold for compression molding. A compression molding method characterized by pressing the molding material into the latching holes of the mold, and then closing the movable mold with the fixed mold for molding. (2) A molding surface for charging a molding material made of sheet molding compound is formed on the surface of the fixed mold, and a molding surface that is fitted into the molding surface of the fixed mold is formed at a portion facing the fixed mold. A compression molding mold having a movable mold arranged therein, characterized in that a plurality of concave latching holes for latching the molding material are formed on the molding surface of the fixed mold for charging the molding material. compression mold.