JPS62207610A - Core mounting structure of molding tool - Google Patents

Abstract

PURPOSE:To make it possible to cope with the single exchange of damaged members and consequently make the lost production time as small as possible and improve the productivity by a method wherein a connecting member to which a core main body is fitted, is detachably mounted to a core holder. CONSTITUTION:At the edge on the cavity 7 side of a core mold 1A, a stepped part 8, to which a sheet iron connecting member 3A formed along a chevron- shaped cavity 7 is detachably fixed with machine screws 9 so as to be flush with the core mold 1A, is shaped. If the connecting member 3A is bent, only thing to do is to open molds, to unscrew the machine screws 9 of the core mold 1A and to dismount the core main body 2A so as to replace the connecting member 3A in order to fix a new connecting member 3A, to which said core main body 2A is fitted, onto the core mold 1A with the machine screws 9. Consequently, no repair or welding work is necessary and the exchange work can be done simply in a short time at low cost.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a structure for attaching a core to a molding die.

BACKGROUND ART For example, in sealing members made of sponge materials used in automobiles and the like, parts where the cross-sectional shape changes or bent parts that cannot be extruded are often formed by press molding.

If one nibless molding is employed in this way, a core is required when the hollow part is fixed in the sealing member.

To explain this with reference to Figures WJ5-7, numeral 1 denotes a core holder which is clamped to a mold etc. not shown, and this core holder 1 has a core body 21 integrally formed therein. By supporting the core body 2 in a cavity formed by an upper mold and a lower mold (not shown), the core body 2 is It is hollow.

Problems to be Solved by the Invention As described above, the core body 2, the connecting member 3, and the core holder 1 make it possible to mold parts where the cross-sectional shape changes or parts that cannot be extruded, such as bent parts. However, the ninth part, which was a companion by integrating each part,
Due to production wear, damage during handling during work, etc., e.g.
It has been pointed out that when the core body 2 is replaced, both the core holder 1 and the connecting member 3 must be replaced as one piece, which is costly.

(9) The above-mentioned connecting member 3 is plate-shaped due to its nature, and the slit portion formed in the product should be made as narrow as possible, so the pressure etc. when press-fitting the sponge material may be repeated. If it is bent, the hollow part will be biased and the precision of the product will be reduced, resulting in an increase in the frequency of replacement.

However, due to the injection pressure of the sponge material, the connecting member 3
If the core holder 1 is bent or broken at the joint, if the core holder 1 were to be repaired or melted each time, the repair time would become lost time and reduce production efficiency. There is a disadvantage.

Therefore, this invention can deal with the damage by simply replacing the damaged members among the core body, the connecting member, and the core holder, thereby minimizing loss time during production and improving productivity. The core attachment of a molding die that is angular in shape provides structure.

A companion means for solving the problem is to detachably attach the connecting member into which the core body is fitted to the core holder.

When replacing any one of the working core body, the connecting member, or the core holder, each member is disassembled, the necessary members are replaced with new ones, and then reassembled.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as those of the conventional structure.

In FIGS. 1 to 4, reference numeral 4 denotes a rubber or plastic molding die for molding a bent sealing member, and a core mold 6, 6 and these molds are placed on one side of a core mold 5. The core mold LA', which is surrounded by a core holder, is polymerized to form the lower half of the cavity 7 bent in a dogleg shape.

In the core mold IA, a stepped portion 8 is formed on the I# side of the cavity 7, and in this stepped portion 8, a connecting member 3A made of an iron plate material along the dogleg-shaped cavity 7 is attached with screws 9. It is removably fixed so that it is flush with the core mold IA.

Then, the terminal 10 of this connecting member 3A protrudes toward the capacity 7 side, and this terminal 10 has a monument 11 for the two core bodies in advance.
It is fitted so that it can be attached and detached. Incidentally, an injection port 12 communicating with the cavity 7 is formed in the core mold IA.

In this way, the two core bodies are attached.

Mold 13 and mold 14 to form the upper half of cavity 7 on the upper part of core mold 5 and core mold IA, 6.6
, 16 are polymerized to perform mold clamping. Incidentally, the molds 14, 15, and 16 are formed with an injection port 12V that matches the injection port 12 of the core mold IA.

According to the structure of the above embodiment, when clamping the mold, first the end 101 of the connecting member 3A is fitted into the groove 11 of the core body 2A, and the connecting member 3A is connected to the step of the core mold IA with the screw 9. 8.

Next, the mold 13 and the molds 14, 15, and 16 are polymerized, brought to a clamped state as shown in FIG. 3, and a material is injected from the injection port 12.

Here, the material pressure applied during material injection repeatedly acts on the connecting member 3A that supports the two core bodies in a cantilevered manner with respect to the core mold IA, and this connecting member 3A is bent. In case, open the mold and remove screw 9 of one core mold,
Simply remove the two core bodies and replace this connecting member 3A, fit the two core bodies into the new connecting member 3A, and fix the three connecting members to the core mold IA with 9 screws to repair. Alternatively, one replacement work can be performed easily and in a short time at low cost without melting work.

Furthermore, since the three connecting members can be made of iron plate material as is, reliability in terms of strength is increased compared to a case where these parts are integrally formed with the surroundings.

Moreover, if either the two core bodies or the core mold IA become worn out or damaged, it goes without saying that only that part needs to be replaced individually.

In particular, in this embodiment, the core body 2A is of core type I.
Since it is supported only by A, there is no effect on other core types 6.6, and the target of core type replacement is core type I in the center.
Since only A is used, there is an advantage that the replacement parts can be made smaller and the number of parts can be reduced.

Effects of the Invention As described above, according to the present invention, since the connecting member into which the core body is fitted is removably attached to the core holder, there is no risk of production wear, damage during handling during work, etc. In the event that parts need to be replaced, it is only necessary to replace the damaged parts individually.Therefore, there is no need to replace the entire thing as in the case of conventional systems where each part is integrated, resulting in lower costs. In addition, repair work requires only parts replacement and no welding work is required, which has a great practical effect in that loss time can be reduced and production efficiency can be improved.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a perspective view of the main part, Figure 2 is a sectional view taken along line 1--2, Figure 3 is an overall perspective view, and Figure @4 is an exploded view. The perspective view and FIGS. 5 to 7 are perspective views of the prior art, respectively. 1 person: core mold (core holder), 2 people: core body, 3A: connecting member. 2 people outside

Claims (1)

[Claims] (1) A core mounting structure for a molding die, characterized in that a connecting member into which a core body is fitted is detachably attached to a core holder.