RU2459700C2 - Mould for injection moulding of plastics - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to injection moulding of plastic materials. Proposed mould comprises mould cavities 1 arranged in lines, moving and stationary mould halves 4, 5 with article extractor assemblies built there in. Every said assembly comprises extractor sunken in opposite mould half flush with mould opening area. Said extractor is jointed with dog coupled with assembly case by pin secured thereto. Said pin is fitted into dog slot to turn thereabout after interaction of dog with lock wedge mounted at mould half opposite the assembly. Extractors 12 made up of trapezoidal-cross-section plates are arranged under walls of several adjacent articles, on both sides of said cavities, and jointed therewith to make integral system of article extraction along the line of said cavities. Extractors 12 may displace along the axis of the line of cavities.

EFFECT: reduced production costs, higher reliability in automatic operation.

4 dwg

Description

The invention relates to the field of processing polymer materials by injection molding and can be used to create high-performance equipment for the manufacture of injection molded products of high quality.

Known injection mold containing movable and fixed half-molds with integrated Quick Strip (DME) product assemblies (hereinafter QS) [1, 2, 3]. The body of such a unit can be installed on any of the half-forms. The unit is used complete with a locking wedge mounted on the opposite half-mold. A puller, which is the working element of this assembly, is brought under the wall of the product manufactured in the form. The puller is made in the form of a plate embedded in the half-mold opposite to the node flush with its connector plane. The puller is adjacent to the punch, forming the inner surface of the product. When the form is opened, the product remaining on the punch carries with it the puller located under the product, regardless of which half-form the housing of the unified product removal unit is located on. The puller is connected to a leash connected to the housing by means of a pin fixed to the housing. The pin is inserted into the longitudinal groove of the leash and slides along it at the beginning of the opening of the form. When the pin stops at the end of the groove, the removal of the puller relative to the forming punch begins and the product is removed from it. In this case, the leash due to the adjoining to the plane of the outgoing wedge with the opposite half-form of the locking wedge is perpendicular to the plane of the mold connector. After the interaction of the leash with the locking wedge is completed, the force exerted on the puller when removing the product deploys it with the leash relative to the pin fixed in the case of the universal unit. In this case, the working plane of the puller moves away from the product, eliminating the possibility of its adhesion. The angle of rotation of the puller is limited due to the abutment of the free end of the leash in the axis overlapping the groove in the housing of the universal unit in which the leash is placed.

The use of the described universal units in a known injection mold allows you to exclude all types of pushers, as well as related parts from the design of injection equipment. The removal of products occurs in the complete absence of friction in the mold.

A disadvantage of the known form is that with an increase in the number of arranging nests arranged in rows, it is necessary to use a large number of QS, which increases the cost of the form. With a multi-row arrangement of forming nests, it is necessary to increase the distance between the rows to accommodate the QS cases. Thus, the length of the melt path to the forming nests is increased. In this case, the balance of the filling of these nests may be impaired, which adversely affects the quality and uniformity of the molded products.

The aim of the invention is to reduce the cost of manufacturing a multi-cavity hot-channel injection mold with a multi-row arrangement of forming nests, as well as providing conditions for a balanced filling of all mold nests with minimal melt paths in the gate channels of its hot-run block and, as a result, improving the quality of molded products.

The invention is illustrated by the following drawings.

Figure 1 shows a view of a fixed half-mold.

Figure 2 presents a cross section of the injection mold (section along aa of figure 1).

Figure 3 presents the cross section of the injection mold (section along BB-1 of figure 1).

Figure 4 presents the cross section of the injection mold (section along BB-1 of Figure 1).

The injection mold (Fig. 2) contains arranging slots 1 arranged in rows, formed by punches 2 and dies 3, a movable and fixed half mold 4 and 5 with universal assemblies for removing products, each of which contains a puller 6 cut into the opposite half mold flush with its plane of the connector and connected to the lead 7, connected to the housing 8 using a pin 9 mounted on the housing, inserted into the groove 10 of the lead 7 with the possibility of turning the lead around it after the interaction of the lead with the locking key SG 11 mounted on the opposite of the module component mold half. The mold is additionally equipped with common strippers 12 in the form of trapezoidal section plates, connected on two sides of each row of forming nests under the walls of several adjacent products and connected along the edges with pullers of 6 universal product removal units, forming a single product removal system along them along the entire row of forming nests, however, the common pullers 12 are arranged to move about the axis of this row.

The operation of the mold with the described collision systems is as follows. When the forms are opened, the products remaining on the punches 2 of each row of the forming nests 1 are carried away by the common pullers 12 (see FIG. 2). These pullers move together with the pullers 6 and leashes 7 connected to them, which belong to the unified product removal units, which are built into the movable and fixed half-molds 4 and 5 (see Fig. 3). At the same time, the pins 9 mounted on the housings 8 slip along the grooves 10 of the leads 7. After the pins 9 rest on the ends of the grooves 10, the leads 7 begin to pull the pullers 6 and the common pullers 12 connected to them, moving the latter relative to the punches 2. The products are removed from the punches 2 without distortions, since the leads 7 are adjacent to the planes of the locking wedges 11 extending with the opposite half-shape (see Fig. 3). After the end of their interaction, the forces applied to the common pullers 12 when removing the products 1 from the punches 2, deploy a unified system for removing products located on both sides of the axis of each row of products 1, around the pins 9. In this case, the working plane of each common puller 12 departs from removed products, excluding the possibility of their adhesion. The rotation angle of the combined collision systems is limited by the free ends of the leads 7 in the axis 13, overlapping the grooves 14 in the housings 8 in which these leads are placed.

The use of common pullers 12 provides a significant reduction in the number of standardized units for removing products in a hot-channel injection mold with a multi-row arrangement of forming nests, which significantly reduces the cost of manufacturing the mold. The ability to move the common pullers 12 relative to the axis of each row of products 1 allows you to place the housings 8 of the unified nodes of removal of products serving the adjacent rows of the forming sockets 1, without increasing the distance between them. This ensures a reduction in the path of the melt to the forming nests and the balance of their filling, which positively affects the quality of molded products.

Information sources

1. Information materials DME: „Quick Strip. A new innovative way of pushing. "

2. Magazine "Plastique", No. 3, 2009. Article "Quick Strip - revolution in the ejection system".

3. Application Pub. No. WO / 2008/154964 12/24/2008.

Claims (1)

Injection mold for the manufacture of plastic products, containing arranging slots placed in rows, a movable and fixed half-mold with built-in pick-up units, each of which contains a puller, cut into the half-mold opposite to the assembly, flush with its connector plane and connected to a leash connected to the body site using a pin fixed to the housing, brought into the groove of the leash with the possibility of rotation of the leash around it after the interaction of the leash with a locking wedge installed on half-shape opposite from the assembly, characterized in that it is additionally equipped with strippers in the form of trapezoidal section plates, connected on both sides of each row of forming nests under the walls of several adjacent products and connected along the edges with the pullers of the product removal units, forming a single product removal system along them the entire number of forming nests, while the pullers are made with the possibility of movement relative to the pullers of the product removal units and the axis of this row.

Images