JPH0574822U - Injection mold - Google Patents

Abstract

(57) [Summary] [Purpose] In a mold for injection molding that molds a product that is divided into a fixed side and a movable side, positions the fixed insert and the movable insert with high accuracy. [Structure] In the present invention, a positioning shape portion 17 is configured by a fixed nest 15 and a movable nest 16 to maintain positional accuracy of both nests. In the positioning shape portion 17, a protruding portion of the fixed nest 15 is a movable nest 16 Is provided by a structure that fits with the trapezoidally tapered portion of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding die, and more particularly to an improvement of means for positioning a fixed insert and a movable insert of the same mold.

[0002]

[Prior Art]

 When molding a resin material product using an injection molding die, the product shape is divided into a fixed side and a movable side based on the shape of the product and the structure of the die. .

FIG. 2 shows a cross-sectional view of the above-mentioned injection mold which the applicant of the present invention has conventionally used. In the figure, 11 is a fixed insert on the fixed side, 12 is a movable insert on the movable side, and 13 is a diagram. A parting line (abbreviated as PL) in which the fixed side indicated by arrow A and the movable side indicated by arrow B contact each other, and 20 is a product shape portion. The product is molded by injecting resin into the product shape part 20, and the resin is passed from the injection molding machine (not shown) through a runner and a spool (not shown) through a gate provided at a position 21. It is injected and a product with the contour shown in the figure with sand is made.

The illustrated product shape portion 20 is formed vertically symmetrically with respect to the PL 13. Since the half of the product formed in the upper half of the product shape part 20 cannot protrude from the mold if it is provided on the movable side due to its shape, the fixed nest 11 and the movable nest 12 forming the product shape part 20 are respectively formed. Provided on the fixed side and the movable side.

When the product shape portion 20 is divided into the fixed insert 11 and the movable insert 12 as described above, product accuracy such as coaxiality and outer step is required. Therefore, a method of adding positioning parts is adopted. Therefore, a fixed side positioning part 14A having a concave central part and a movable side positioning part 14B having a convex central part are provided in the fixed nesting part 18 and the movable nesting part 19, respectively. Ensure the positional accuracy of the fixed insert 11 and the movable insert 12.

[0006]

[Problems to be solved by the device]

 As can be seen from FIG. 2, the positioning means described above requires a fixed-side positioning part 14A and a movable-side positioning part 14B, which are particularly costly to form, and moreover are directly applied to the molding of the product. Since it does not contribute, the working space of the mold is reduced.

Further, regarding the positioning accuracy itself, it is necessary to consider the vertical position accuracy together with the part accuracy. Since the clearance relationship must also be seen in the relationship between the fixed insert 11 and the fixed insert 18, and the movable insert 12 and the movable insert 19, the positioning of the fixed insert 11 and the movable insert 12 may not be perfect. is there.

Therefore, an object of the present invention is to divide the product shape into a fixed side and a movable side of an injection molding die, improve the positional accuracy of the fixed side and the movable side, reduce the number of parts, and reduce the cost. To provide an effective structure.

[0009]

[Means for Solving the Problems]

 In the injection molding die of the present invention, the product shape part is formed over the fixed side fixed insert and the movable side movable insert, and the positioning form part is provided outside the fixed insert and the movable insert. And the movable nest are positioned.

[0010]

[Action]

 That is, according to the present invention, the fixed inserts and the movable inserts that form the product shape are provided with positioning shape portions that are fitted to each other, for example, such that the fixed side has a convex shape and the movable side has a concave shape in order to provide direct positional accuracy. The positioning of the fixed insert and the movable insert is performed by.

Hereinafter, an embodiment of the present invention will be specifically described with reference to FIG. 1. In FIG. 1, the same parts as those shown in FIG. 2 are designated by the same reference numerals, 15 is a fixed nest, and 16 is a movable nest. Nest, 17 is a positioning shape part, 18 is a fixed nest part, and 19 is a movable nest part. The fixed insert 15 and the movable insert 16 are configured to contact each other along the parting line 13 as in the conventional example. The fixed insert 15 and the movable insert 16 provide a product shape portion 20 and form a positioning shape portion 17 on the outside. In the illustrated example, the positioning shape portion 17 has a structure in which the trapezoidal taper portion of the movable nest 16 and the protruding portion of the fixed nest 15 are fitted to each other. After the fixed insert 15 and the movable insert 16 are fitted as shown, the fixed insert 18 and the movable insert 19 are joined together. At this time, since the fixed nest 15 and the movable nest 16 have been joined with high precision when the fixed nest portion 18 and the movable nest portion 19 are joined, there is no particular problem in maintaining accuracy.

[0012]

[Effect of the device]

 As described above, according to the present invention, the accuracy of the product shape portion 20 formed over the fixed nest 15 and the movable nest 16 is formed only by the positioning shape portion 17 formed on these nests. Therefore, if the component accuracy of only the fixed insert 15 and the movable insert 16 is satisfied, there is an effect that the product shape part 20 is configured with high accuracy, and further the additional parts of the conventional example are unnecessary. Therefore, the number of parts and the processing cost can be reduced. The structure of the positioning shape portion is not limited to the example shown in the figure, and may have another shape for fitting or coupling the fixed insert and the movable insert with high accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an injection molding die according to the present invention.

FIG. 2 is a cross-sectional view of a conventional mold.

[Explanation of symbols]

 11 Fixed Nest 12 Movable Nest 13 Parting Lines 14A, 14B Positioning Parts 15 Fixed Nest 16 Movable Nest 17 Positioning Shape 18 Fixed Nest 19 Movable Nest 20 Product Shape 21 Gate Position

Claims (1)

[Scope of utility model registration request] 1. In an injection molding die for producing a resin injection molded product, a product shape portion (20) is formed between a fixed side fixed nest (15) and a movable side movable nest (16), and a fixed nest ( Injection molding characterized in that a positioning shape part (17) is provided outside the movable nest (16) and the movable nest (16), and the fixed nest (15) and the movable nest (16) are positioned by the positioning shape part (17). Mold for molding.