SU1426820A2 - Mould for making polymeric articles - Google Patents

Abstract

The invention relates to injection molds for the manufacture of polymeric products. The purpose of the invention is to increase the reliability of the central ejector. For this, the casting mold, which contains a punch 3 which is spring-loaded relative to the base 7 and has an insert 5 fixed at the base with a hole for the central ejector 4 with longitudinal grooves 8 on the cylindrical section, is provided with a sleeve 10 installed in the insert that is connected to the ejector hole forming longitudinal channels. Such a constructive solution eliminates the distortion of the central ejector and at the same time, after removing the product from the die by displacing the liner 5 and forming the vacuum cavity, the latter depressurizes the product to reset the product. 3 il. t (L

Description

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The invention relates to a tooling for the processing of polymeric materials by injection molding, can be used to manufacture products with a developed surface and is an improvement of the known device described in the author. No. 1087348.

The aim of the invention is to increase the reliability of the central: ejector.

Figure 1 shows the form in a closed position; figure 2 - section aa in figure 1; figure 3 - form before; pushing the product.

Casting form - contains a fixed gating plate 1, rigidly connected with the matrix 2, a punch 3, in which the core 5 is mounted concentrically with the central pusher 4 with the sealing element 6, fixed in the base 7. made fungal with longitudinal grooves 8 on the cylindrical section 9 and has two supporting surfaces: one surface on the insert 5, the other on the coaxial sleeve 10 for the central ejector 4, which is filled with holes 1 1 along longitudinally forming channels 12, the punch 3 is spring-loaded relative to the base 7 and connected with it by rods 13.

Casting form works as follows.

After injection of the polymer material and technological exposure form

is opened. At the initial moment of opening, a connector is formed between the punch 3 and the base 7, while the punch 3 moves relative to the liner 5 and a vacuum cavity is formed under the product 13, due to which upon further opening of the shape and the formation of the plug between the die 2 and the punch 3 the product remains on punch 3. Next, the central ejector 4 pushes against the stop of the injection molding machine and moves it along the supporting surfaces, joining by means of longitudinal grooves 8 in the cylindrical section of the central ejector ate 4 and channels 12 in the sleeve 10, a vacuum cavity with an air medium. Following this, the article 13 is removed by a central ejector from the mold.

Thus, during operation of the ejector, by installing the sleeve 10, it is skewed.

Claims (1)

Invention Formula Casting mold for the manufacture of polymer products according to ed. No. 1087348, characterized in that, in order to increase the reliability of the central ejector, the form is provided with a sleeve coaxially mounted in the liner for the central ejector, which is connected with a hole along the longitudinal channels forming the liner. Thebes 1 fig.Z Compiled by V.Shuralev Editor K.Krupkina. Techred M.DidykKorrektor M.Demchik Order 4814/18 Circulation 559 VPIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 4-D FIG. g f Emphasis no-LJ llostobtomo Subscription