RU2302338C2 - Mold for manufacture of the articles out of plastics - Google Patents

Abstract

FIELD: chemical industry; mold for manufacture of the molded plastics articles.

SUBSTANCE: the invention is pertaining to the field of reprocessing of the plastics materials, in particular, to manufacture of the articles of the tee pipe type and the angle piece articles and may be used in production of these articles, both by the pressure method, and the method of the pressure die casting. The technical result of the invention is development of such a design of the mould, which would allow using the same tool set to produce both the articles of the tee pipe type and the angle piece articles. At that the geometry of the latter could be varied, that dilates the technological capabilities of the mold, and also reduces the costs of manufacture of the tool set. The technical result is reached due to the fact, that the mold additionally contains the set of the characters, in which one of the lateral characters represents the longitudinally-cutting insert having the concave barrel-shaped and conjugated with it cylindrical form-shaping surfaces corresponding to the middle part of the external contour of the article of the angle piece type. At that the second lateral character and the central character have the convex barrel-like shape and the conjugated with it shaping surfaces corresponding to the internal contour of the angle piece. The geometry of the angle piece may be varied.

EFFECT: the invention ensures development of such a design of the mould, which would allow using the same tool set to produce both the articles of the tee pipe type and the angle piece articles.

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Description

The invention relates to the field of plastics processing, in particular to the manufacture of products of the type tee and square, and can be used in the manufacture of these products both by pressing and injection molding.

A known mold (see British Patent No. 948569, class B29D, G, published. 1964), intended for the manufacture of plastic products such as tee. The mold consists in particular of a matrix, a punch, side and central signs.

The disadvantage of this mold: narrow technological capabilities - obtaining products of only one form.

The closest in technical essence and the achieved result to the claimed invention, the prototype is a mold (see A.S. SU 1316839 A1, class. B29C 43/18, published. 15.06.87). The mold is intended for pressing tee-type products from plastic and, in particular, consists of a matrix and a punch having internal cavities, the shape of which corresponds to the external contour of the product to be manufactured, side and central signs forming the internal contour of the product.

Mold disadvantage: narrow technological capabilities - obtaining products of only one form.

The objective of the invention is to develop such a design of the mold, which would make it possible to produce products such as tees, and products such as a square, while the geometry of the latter could vary.

The problem is solved due to the fact that the known mold is a prototype intended for the manufacture of plastic products, containing a matrix and a punch, side and central signs forming the external and internal contours of the product, according to the claims additionally contains a set of characters, in which one of the side signs is a longitudinally-split insert having a concave barrel-shaped and associated with it, a cylindrical shaping surface corresponding to the middle part of the outer contour of the product t a square, the height of the barrel equal to the diameter of the liner, the radius of the forming barrel equal to half the diameter of the liner, the equator radius of the barrel is larger than the radius of the forming barrel, but smaller than the diameter of the liner, and the second side and center marks have a convex barrel-shaped and conjugated with it, conical forming surfaces corresponding to the inner contour of the square.

The specified set of features is new, unknown from the prior art and solves the problem, since when installing in the mold a liner with the geometry of the working part corresponding to the outer contour of the product such as a square and signs with the geometry of the working part corresponding to the inner contour of the square, the press cavity forms takes the form of a square.

The selected ratios of the parameters of the barrel liner are optimal, because they allow you to get the best geometry of the product type square.

With a change in the equatorial radius of the barrel of the longitudinally split insert and signs, the shape of the square changes.

The composite design of the liner solves the problem of making a concave barrel-shaped working surface using turning, which is not possible with an integral liner. Turning allows you to get a more accurate shape and less roughness of this surface than, for example, milling.

The invention is illustrated by drawings (3D-models), where:

figure 1 shows the mold in exploded form in the configuration for the manufacture of products such as a square;

figure 2 shows a longitudinally split liner forming the middle part of the outer contour of the square;

figure 3 shows the sign forming the inner contour of the square.

The mold consists of a matrix 1, a punch 2, an insert 3 and signs 4, 5.

A mold for the manufacture of products such as a square is used as follows. The matrix 1 is installed on the lower press plate (see Fig. 1). In special recesses of the matrix, insert 3 and signs 4 and 5, intended for the manufacture of products of the square type, are installed from the mold set. Signs 4 and 5 are self-aligning due to mating surfaces. The liner 3 is fixed from rotation around its axis by pins (not shown). A die 2 is mounted on the die 1. The mold is clamped by the upper press plate and the molten material is fed under pressure to the mold cavity through the gate channel of the die 2. After molding and cooling the product, the pressure of the press and casting material is released, after which the mold is disassembled and the finished product is removed.

For the manufacture of tee-type products in a mold, the same matrix 1 and punch 2 are used, as well as side and central signs, the geometry of the forming surfaces of which corresponds to the inner contour of the tee. The manufacturing technology of the products is the same as for squares.

Thus, a mold equipped with character sets in combination with an insert allows you to make two different products - a tee and a square, while the geometry of the latter can vary. This invention will expand the technological capabilities of the mold and reduce the cost of manufacturing tooling.

Claims (1)

A mold intended for the manufacture of plastic products, containing a matrix, a punch, side and central signs forming the external and internal contours of the product, characterized in that it further comprises a set of signs, in which one of the side signs is a longitudinally split insert, having a concave barrel-shaped and associated cylindrical shaping surfaces corresponding to the middle part of the outer contour of a product of the type square, while the height of the barrel is equal to the diameter of the liner, radius the forming barrel is half the diameter of the liner, the barrel equator radius is larger than the radius of the forming barrel, but smaller than the liner diameter, and the second side and center marks have a convex barrel-shaped and conjugated conical forming surfaces corresponding to the inner contour of the square.

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