JPS6255114A - Mold for injection molding - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a mold of high accuracy and high quality with less man power, by forming independently mold parts molding each molding part and by forming mold parts molding each connecting part with a plurality of unit blocks. CONSTITUTION:The template 10 of the movable mold I is constituted of a mold frame 11, a large number of cup-shaped male molds 12, 12... and a large number of square cylinders packed between the male molds 12 and between the male mold 12 and the mold frame 11. The template 14 of the fixed mold II is constituted of a large number of female mold 16 cooperating with the male mold 12 to constitute the cavity C for molding a cup-shaped body 1 and a large number of unit blocks 17 which are packed between the female molds 16 and between the female mold 16 and cooperate with the unit blocks 13 to constitute the cavity for molding, a connecting part 2. In this type of mold, as mold parts having specified shapes are only manufactured from steel blocks, these manufacturing can be done by less man power and sorter time as compared with the case where the whole mold including the connecting parts is processed by cutting. The part of the mold having a complicated shape can be manufactured separately in this case.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an injection mold that can produce a high-precision, high-quality mold in a short period of time with less manpower.

[Technical Background of the Invention The two-split molds used for injection molding of co-plastic molded products are manufactured by the following methods depending on the molded product.

(a) Remove unnecessary parts from the steel ring by cutting, grinding, electrical discharge machining, etc. to form a formed part.

(b) A mold is made based on the prototype using the electroplating method, precision casting method, etc., and molten metal is poured into the mold.

[Problems with the background technology] However, in method (a), many steps such as additive knee neutralization and knee finishing must be performed before obtaining the final shape and surface condition, which requires a lot of manufacturing time. The problem is that it requires manpower and a long period of time. Recently, the development of machine tools has progressed,
Although the amount of work that requires manual labor has been reduced, there is an inherent limit to shortening the production period.

In addition, the (mentioned) method has the advantage of having fewer steps and being able to manufacture in a relatively short period of time, but it has many restrictions in many respects such as dimensional accuracy and surface finish, and has the disadvantage of not being able to obtain high-quality molds. There is.

[Objective of the Invention] The present invention was developed in response to these conventional difficulties, and provides an injection molding mold that can produce a high-precision, high-quality mold in a short period of time with less manpower. The purpose is to

[Summary of the Invention] In other words, the injection molding mold of the present invention is an injection molding mold for injection molding a molded product consisting of a plurality of molded parts having a predetermined shape and a connecting part connecting these parts. The precision of the molded product can be improved by independently forming the molding parts that mold each molded part, and by forming the molding part that molds the connection part from a plurality of unit blocks.
The aim is to improve quality and shorten mold manufacturing time.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an injection molding mold according to an embodiment of the present invention, and as shown in FIG. It consists of a movable mold EI] and a fixed mold [II] for injection molding a molded product consisting of a connecting portion 2.

As shown in Fig. 1, the movable mold plate 1 of this embodiment
0 is a formwork 11 and a plurality of pot-shaped male molds 12, 12, placed at predetermined positions within this formwork 11.
And, these 12 male molds and a large number of prismatic unit blocks 13.13 filled between the male mold 12 and the formwork 11...
It is composed of...

Furthermore, the mold plate 14 of the fixed mold [II] is also disposed at a position corresponding to the male mold 12 in the mold 15, and cooperates with the male mold 12 to form a plurality of cavities C for molding the pot-like body 1. 16 female molds, 16 female molds, 16 female molds, and 1 mold
5, and a plurality of unit blocks 17 forming a cavity in which the connecting portion 2 is formed in cooperation with the unit blocks 13.

The formwork 11 of the movable type [I] is fixed to a retaining plate 19 with bolts 18 . 20 is a support, 21 is a spacer block, 22 is a stripper plate, 23 is a movable side mounting plate, and 24 is a knockout pin.

Further, the fixed type [II] formwork 15 is attached to the holding plate 25 with bolts (not shown), and is attached to the fixed side attachment plate 27 via the runner stripper plate 26. 28 is a sprue bushing, and two are guide pins.

Next, the procedure for assembling each template in the mold of the present invention will be explained based on FIGS. 3 to 6.

A large number of unit blocks 30 having a predetermined length, and a type II type 3 for forming only a portion corresponding to, for example, the tip-shaped body 1 in FIG.
First, as shown in FIG. 3, one side of the formwork 32 is placed on a regular board, and the unit blocks 30 are stacked at predetermined positions on the formwork 32. At this time, unit block 30
In order to prevent mutual displacement of the unit blocks 30, it is preferable to adhere the unit blocks 30 to each other using an anaerobic instant adhesive, such as cyanoacrylate, as appropriate. The dimensions of the unit blocks 30 are, for example, 1/8"
(If it is often a multiple of 3,175+I1m>,
Make it 1/8” square.

When the unit blocks 30 are stacked to have a predetermined size and shape, an eleventh mold 31 is placed at a predetermined position as shown in FIG. 4, and the unit blocks 30 are further stacked. By repeating this operation, when the final shape as shown in FIG. 5 is obtained, the unit blocks 30 are joined together, and the unit blocks 30 and the mold units 4 are joined together by seam welding or the like using a laser beam from the bottom. stick together.

Note that seam welding may be performed during the assembly process.

Thereafter, as shown in FIG. 6, the other three molds 32 are screwed together to complete one template. The template on the other side is assembled in the same manner.

In an injection mold assembled in this way, only the molded part with a predetermined shape needs to be machined from between the steel materials, so it is smaller compared to the case where the connecting part is also machined. It can be processed in a short period of time by a large number of people. In particular, this mold can be manufactured by manufacturing a large number of each part and simply changing the number of unit blocks and the laminated shape, and molded products with repeating shapes, for example, by changing the spacing of the connecting parts 2 of multiple pot-shaped bodies 1. Therefore, the production period can be significantly shortened. Further, since molded parts having complicated shapes can be separately manufactured using a cutting method with good precision, a molded product with good overall dimensional accuracy and surface finish can be obtained.

[Effects of the Invention] As explained above, according to the injection mold of the present invention,
The connecting part of a mold for indexing molding of a molded product consisting of a plurality of molded parts having a predetermined shape and a connecting part connecting these parts is formed by a plurality of unit blocks, and the connecting part is created by increasing or decreasing the number of unit blocks. Since the interval can be set arbitrarily, high-precision, high-quality molds can be manufactured by a small number of people in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an injection mold of the present invention, FIG. 2 is a sectional view of a molded product molded by the embodiment, and FIGS. 3 to 6 are similar to FIG. 1. FIG. 3 is a perspective view showing an assembly process of the illustrated embodiment. 1・・・・・・・・・Cop-like body 2・・・・・・
・・・・・・Connection part 4・・・・・・・・・ Gold'll knit 10.14
...Mold plate 11.15...Mold frame 12...Male mold 13...Unit block 16...
......Female type 17...Unit block applicant
Toshiba Chemical Corporation Patent Attorney Satoshi Suyama - Figure 1 Tsuyoshi 2 Figure λ1 Figure 3 tC40 Figure 5 Figure 6

Claims (2)

[Claims] (1) In an injection mold for injection molding a molded product consisting of a plurality of molded parts having a predetermined shape and a connecting part that connects them, the molding parts for molding each of the molded parts are made independent of each other. A mold for injection molding, characterized in that a molding portion for molding the connecting portion is formed of a plurality of unit blocks. (2) The injection mold according to claim 1, wherein the molded part of the molded product has an uneven shape, and the connecting part has a flat shape.