JPH01204708A - Metal mold for molding - Google Patents

Abstract

PURPOSE:To enable the title mold to prevent slip between cavity blocks facing each other, by a method wherein matters whose thermal expansion coefficient are different from each other are used for materials of a cavity block and cavity block base and the mold is made into a mechanism where one side moves the same amount with the passage of time based on the other side. CONSTITUTION:One side cavity block 1b is fixed completely to a cavity block base 4b. The outer cavity block 1a is set up to a cavity block base 4a with a set bolt 7 constituted of a bolt 10, coned-disc spring 5 and stepped piece 6 fixing a tightening quantity of the bolt 10. Then the set bolt 7 possesses a function allowing relative displacement of the other side cavity block 1a according to amount of a quantity of variation with the passage of time of relative relation between cavity blocks 1a, 1b on the basis of the cavity block 1b facing on the cavity block 1a. Positioning members 2a, 2b of both the cavity blocks 1a, 1b are fitted in each other and mutual relational position between the cavity blocks 1a, 1b is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for correcting initial and temporal misalignment between opposing cavity blocks in a molding die, and for positioning the blocks.

[Conventional technology]

Conventionally, this type of molding die includes an upper die 11 including a cavity block 1a, a cavity block base 4a, and a die base 16a, a cavity block 1b, and a cavity block, as shown in FIGS. 6 and 7. It consists of a base 4b and a lower mold 12 including a mold base 16b.

13a and 13b are guide posts that fit into each other; 14;
1 is a molding device, 15 is a slide table, and 17 is a bolt. As shown in FIG. 8, the cavity blocks la and lb are mounted with bolts 20 with reference to the pilot bins 19 set up on the cavity block bases 4a and 4b.
or cavity block base 4
Bolt 2 based on the side wall of the recess machined on a and 4b
Further, guide posts 13a are installed at the four corners of the opposing cavity block bases 4a and 4b.
, 13b, and a plurality of positioning blocks 23a, 23b as shown in FIG. 9 or 10 are installed to combine the upper mold 11 and the lower mold 12.

Then, it can be attached to the mold forming device 14 by fixing it with bolts using a jig clamp or by fixing it to the mold forming device 1
As shown in FIG. 11, only the lower mold 12 to be set on the slide table 15 of
A rubber member 18 is inserted between the bolt 17 and the bolt 17 to fix it.

[Problem to be solved by the invention]

In the conventional molding die described above, the positioning between the opposing cavity blocks la and lb is determined by the positioning accuracy of the pilot bins 19, etc. on the surfaces of the cavity block bases 4a and 4b shown in FIG. Guide post 13a shown in FIG.

The position of the positioning block 13b and the accuracy of processing, and furthermore, the initial assembly accuracy depends on the mounting position and processing accuracy of the positioning blocks 23a and 23b shown in FIG. 9 or 10.

However, the materials of the cavity blocks la, lb and the cavity block bases 4a, 4b are not of the same quality due to problems in heat treatment due to the size of the materials and problems in cost during material and processing.

Therefore, the cavity blocks la and lb are fixed on cavity block bases 4a and 4b having different coefficients of thermal expansion.

This is because the cavity blocks la, lb and cavity block bases 4a, 4b are affected by the heat load during molding.
This shows that the amount of change over time is not the same, and the positional relationship between the opposing cavity block bases 4a and 4b is that of the guide post 13a.

13b and positioning blocks 23a, 23b, the opposing cavity block la
, lb cannot maintain their initial positional relationships and shift, resulting in variations in product quality.

In addition, a first mold that allows the lower mold 12 to move with the upper mold 11 as a reference is used to reduce the overall amount of deviation between the upper mold 11 and the lower mold 12.
Although there is an example shown in FIG. 1, there is a drawback that it cannot be expected to be very effective in preventing the intended positional shift between the cavity blocks la and lb.

Furthermore, at the time when a deviation occurs between the opposing cavity blocks la, lb, the cavity block bases 4a, 4
The functions of the pilot bin 19 and the recessed portion on b are lost, and the reference for readjustment is also lost, which has the drawback of requiring trial and error adjustment by experts, resulting in a large amount of lost time.

An object of the present invention is to provide a molding die that solves the above problems.

[Differences between the invention and the prior art]

In contrast to the conventional molding die described above, the present invention uses materials with different coefficients of thermal expansion for the cavity block and the cavity block base, so that even if there is a difference in the amount of change over time due to heat load, they can be opposed to each other. The difference is that by setting one of the cavity blocks as a reference, the other is an avi that moves by the amount of change over time, thereby preventing misalignment between the opposing cavity blocks.

[Means to solve the problem]

In order to achieve the above object, in the molding die of the present invention, a pair of cavity blocks forming a resin molding cavity is provided, and a cavity block is provided on each of the pair of cavity blocks to regulate the relative position of both cavity blocks. It has a positioning member and a cavity block base that holds each of the cavity blocks, one cavity block is fixed to one cavity block base, another cavity block is fixed to another cavity block base, and one cavity block is fixed to the other cavity block base. The cavity blocks are supported so as to be relatively displaceable according to the amount of change over time in the mutual relationship between the two cavity blocks.

〔Example〕

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

(Example 1) FIGS. 1, 2, and 3 (a), (b), and (C) are diagrams showing a first example of the present invention.

Figure 1 is a front view showing the state in which the cavity block of the molding die is set on the cavity block base, Figure 2 is a sectional view of the same side, Figures 3 (a), (b), (
c) is a detailed view of the set bolt that sets the cavity block.

Opposing cavity blocks la and lb forming resin molding cavities have convex and concave positioning members 2a for positioning the mutual relationship of the cavity blocks la and lb.
, 2b. One cavity block 1b is completely fixed to the cavity block base 4b with bolts 20. The other cavity block 1a is shown in FIG.
a), (b).

As shown in (C), bolt 10, spring 5 and bolt 1
0 tightening is set in the cavity block base 4a with a set bolt 7 consisting of a stepped piece 6 that determines the amount (that is, a stepped piece that determines the compression force of the spring 5), and the set bolt 7 is cavity block 1
It has a function of allowing the other cavity block 1a to be relatively displaced in accordance with the amount of change over time in the mutual relationship between the cavity blocks 1a and lb with reference to b.

Furthermore, in order to approximately determine the mounting positions of the cavity blocks la and lb on the cavity block bases 4a and 4b, the outer dimensions of the cavity blocks 1a and 1b are 0.1
Guide rails 3 are provided at relatively large positions.

Further, the guide rail 3 is heat-treated to prevent thermal deformation over time.

Next, the function of the cavity block 1a will be described.

If there is a positional shift between the cavity blocks 1a and 1b facing each other, when the positioning parts 2a and 2b are engaged, force will be applied to the cavity block 1a from the side, but the cavity block 1a and the stepped piece 6 will be As shown in FIG. 3(C), there is a gap in the lateral direction between them, and since the cavity block 1a is held only by the compression force determined by the compression amount A of the flat spring 5 of the set bolt 7, it is easy to It will move within the guide range of the guide rail 3. That is, the cavity block 1a is relatively displaced with respect to the opposing cavity block 1b according to the amount of change over time in the mutual relationship between the cavity blocks 1a and 1b, and both cavity blocks l
Positioning members 2a and 2b of a and lb fit into each other, and the relative positions of cavity blocks la and lb are regulated.

Thereafter, resin molding is performed using both cavity blocks la and lb.

(Example 2) FIG. 4 is a diagram showing a second example of the present invention. Here, the illustration of the cavity block 1b fixed to the cavity block base 4b is omitted.

Further, the structure of the positioning members 2a and 2b for positioning between the opposing cavity blocks la and lb is shown in FIGS. 1 and 2.
In this embodiment, the cavity block 1a is similar to that shown in the figure.
is held by a set bolt 9 using a coil spring 8 in place of the flat spring 5 shown in FIG.

The cavity block base 4a has a cavity block 1b which roughly defines the mounting position of the cavity block 1b.
A recess 4c is provided which is approximately 0.1 larger than the outer dimension of the recess 4c.

(Embodiment 3) FIG. 5 is a diagram showing a third embodiment of the present invention. Here again, the description will focus on the cavity block 1a which can be moved by external force.

Further, the structure of the positioning members 2a and 2b between the opposing cavity blocks la and lb is the same as in FIGS. 1 and 2.

In this embodiment, the cavity block 1a is held by a set bolt 22 in which the flat spring 5 of the set bolt 7 shown in FIG. 3 is replaced with fluororubber.

Incidentally, the cavity block 4a is provided with a pilot bin 19 having a diameter difference of about 0.1 between the inner and outer diameters, which roughly determines the mounting position of the cavity block 1a.

These second and third embodiments are based on the cavity block 1
The function of a is the same as in the first embodiment, and the shape of the cavity block base 4a is the same as the structure of the conventional mold, so there is an advantage that the present invention can be applied without major modification.

Furthermore, the combination of the set bolt 7.9.22 and the shape of the guide of the cavity block base 4a in the embodiment is free.

In the present invention, the number and thickness of the cavity blocks are arbitrary, and the transfer molding die and the injection molding die are also arbitrary.

〔Effect of the invention〕

The molding die of the present invention described above has a positioning structure between the cavity blocks that form the final molded product, and one of the opposing cavity blocks can be moved with a minute force on the surface of the cavity block base. (a) The alignment of opposing cavity blocks during initial assembly of a molding die can be completed automatically if dimensions are checked properly before assembly.

(b) Positional deviations between the cavity blocks, which occur due to differences in thermal expansion coefficients due to differences in materials and heat treatment methods between the cavity blocks and the cavity block base, are naturally adjusted within the alignment tolerance of the positioning blocks, reducing assembly and adjustment time.

(c) It is possible to reduce production losses and costs incurred by repair and adjustment technicians while correcting deviations over time.

(d) It is possible to eliminate product defects due to time-related differences and to stably produce products of stable quality.

There are extremely large effects such as

[Brief explanation of the drawing]

Figures 1, 2, and 3 (a), (b), and (c) are
1 is a front view showing the relationship between a cavity block and a cavity block base, FIG. 2 is a sectional view of the same side, and FIGS. b
), (C) are detailed views of the same parts, FIG. 4 is a side sectional view showing the second embodiment of the present invention, FIG. 5 is a front view showing the third embodiment, and FIGS. The figures are all diagrams showing examples of conventional molding dies; FIG. 6 is a front view of the molding die set in a molding device, FIG. 7 is a side view of the molding die, Figure 8 is a perspective view showing a conventional example in which a cavity block is fixed to a cavity block base, and Figures 9 and 10 are cavity block bases for aligning the upper and lower molds of the molding die. FIG. 11 is a perspective view of a positioning block installed above, and a sectional view showing a conventional example of a set bolt for fixing a molding die on a slide table of a molding apparatus. la, lb...Cavity block 2a, 2b...Positioning member 3...Guide rail 4a, 4b...Cavity block base 5...Set spring 6...Stepped piece 7...Set bolt 8 ...Coil spring 9...Set bolt
10...Bordeaux 1...Upper mold 12
...Lower molds 13a, 13b...Kitebost 14...Mold forming device 15...Slide table 16...Mold base 17...Bolts 18...
...Rubber member 19...Pilot pin 20
...Bolt 21...Fluororubber 22.
...Set Bolt Patent Applicant Toyama NEC Co., Ltd. Agent Patent Attorney Naka Kanno Figure 2 (0L) Figure 3 Figure 4 Figure 9 Figure 1O

Claims (1)

[Claims] 1. A pair of cavity blocks forming resin molding cavities, a positioning member provided on each of the pair of cavity blocks to regulate the relative position of both cavity blocks, and a cavity block base for holding each of the cavity blocks. and one cavity block is fixed to one cavity block base, the other cavity block is fixed to the other cavity block base, and the mutual relationship between both cavity blocks is fixed over time with respect to the opposing one cavity block as a reference. 1. A molding die characterized in that the molding die is supported so as to be relatively displaceable according to the amount of change in temperature.