SU1331653A1 - Casting mould for manufacturing articles made of thermoplastic materials - Google Patents

Abstract

The invention relates to injection molds for the manufacture of polymeric products. In order to improve the quality of the products and increase the productivity of the mold, it is equipped with a spring-loaded ejector, made with a head, and a stop sleeve for the head; The product ejector and titnik are installed with the possibility of contact with the fixed design of the slab on the plate, and in the turn of the case there are distributing runner gates. As the polymer melt enters the mold, the gate ejector moves, which acts on the thrust hub and through the non-price of the product ejectors, which retract as the melt enters, compressing the resilient elements. 1 hp f-ly, 5 u, t. 00 with O) cd oo

Description

The invention relates to the field of manufacturing articles from thermoplastics by injection molding.

The purpose of the invention is to improve the quality of the products and increase the productivity which is achieved by the fact that the molding of the casting is carried out from the beginning of the melt entering the forming cavity and during the molding, cooling and crystallization of the products, and the shape is multi-cavity.

FIG. 1 shows the casting mold after sanding prior to the start of polymer injection; on fi1. 2 the same at the time of the beginning of the exposure under pressure; in fig. 3 - casting mold with a cavity for cooling marks on a siecapi mold prior to the start of polymer injection; in fig. 4 is the same at the time of the soaking pressure; in fig. 5 section. Л А in FIG. one.

The casting mold contains design 1, plate 1 and base, body 2, body 3 with dies 4, made relatively movable in the axial direction, central ejector, ejectors 6 installed with the possibility of contact with a non-moving design, plate 1, the thrust bushing 7, installed in a movable axial direction. 1, 1 tin 8, installed with the possibility of loading the spring 9 by pressure 1) asplav. The ejectors 6 are loaded with a compensating mechanism 10 mounted on the base 2, the support plate 7 and the ejectors 6 are in force force interconnected with each other by means of the first room mechanism; ma 10 and are made with the rigidity of the pressure of the melt, with the power engagement between the ejector 6 and the thrust sleeve 7 O1 divided by the possibility of the latter, and the ejector 6 have the possibility of axial alternation O1 with an emphasis 11.

 the elements of the compensating mechanism 10 are made up of composite bodies of elastic bodies 12 and 13 with different characteristics, some of which are made of elastomer (for example, polyurethane washers I and are deformable to push the casting 14, and pre-pressures of the casting 14. The pushers 6 have a collar 15 for providing forceful interaction with the stop screw, 1st 7. The case 3 and matrips are filled with tateential sprues 16 (phi1.5). The containers 12 and 13 have 1 sz of 17 and 18 each. In the casting mold, the mold is 19 d, 1 of the registration of the answer to, 1, 4.

The casting form works for the next (j6 time).

After the mold is closed, Biipi icK melts the polymer through

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Sprue 20 of the shaping plate 1. When the polymer melt reaches the required pressure, the head 8 moves to the left under the pressure of the melt, loading the spring 9, comes into force contact with the thrust sleeve 7 and moves with it. At this point, tangential sprues 16 are opened (Fig. 5). and the resistant sleeve 7 enters into force interaction with the shoulders 16 of the ejector 6 and opens the mold cavity. Starts "pr (x-trill melt into the mold cavity. Filling it, the melt acts on the ejector fi, forcing the latter to move left, deform and loading the loli-urethane plates 12 of the compensating mechanism 10 through along; 1 shank 17. The movement of the ejector 6 to the left continues, the atom power engagement of the collar 15 of the thrust sleeve 7 is stopped and the shaft 17 rests on the slide 18, the deformation of the elastic washers 12 is stopped, the deformation of the disc springs 13 begins.

The movement of the pusher 16 to the left is limited or the condition of equality of the forces of the cup springs 13 and the pressure of the melt in the form or stop II through the rails 17 and 18. The melt injection stops through the sprue 20 and the springs 16 and 20 begin to crystallize as the cooling and crystallization pour out ( 14 (Fig. 2), they are pressed by ejectors 6 with the force of a “cocked disc spring 13. After holding under pressure and cooling, the mold opens. Due to the painful compaction of the material, the casting moves to the right along with the movable matrix 4 on the magnitude of the deformation of the container, 1 springs 13. The movable matrix 4 coats the casting 14 before the activation of much smaller elicits. 1 ejection, obtained by means of polyurethane washers 12.

When the decorating plate 1 moves to the right, the litnical system is separated from it. The further ejection stroke of the separation, 1 from the gate 14, the gate system and the gate system is reset by the center; 1 to 1 of the ejector 5 driven by the injection molding machine (not shown) and the head 8. All mechanisms come back to the original the position, and the relatively movable matrix 4 and the head 8 come to their initial position when the mold is closed.

Then the cycle repeats. The mold shown in FIG. 3 4 differs from that shown in FIG. 1 by the fact that the ejection cavity 6 is made in the mold 21, and there is also a gap b between the collet 15 and the thrust sleeve 7 in the initial position of all the mechanisms. The mold is fitted with seals 22 to prevent coolant from entering the icing-up and mold mechanisms.

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and and 2 oh3 and 4) polymer works

Casting form (Fig. As follows.

When the melt reaches the required pressure, the head 8 moves to the left under the action of the melt, loading the spring 9, comes into force contact with the stop sleeve 8 and moves with it. At this moment, the tangential gate 16 opens and the chamber melts into the cavity in the molds, and only after the gap b passes by the stop sleeve 7 it enters the force engagement with the collar 15 and the ejector 6 starts to move to the left. Filling the cavity with melt also occurs differently.

For heat removal, a cooling cavity 21 of the ejector 6 is provided, which, when it moves to the left, frees the mold cavity for the re-flowing melt. The rest of the process is similar to the specified (in Fig. 1 and 2).

The proposed design allows to obtain high-quality castings by pre-pressing the casting from the beginning of the melt entering the forming cavity and during the molding, cooling and crystallization of the products.

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Claims (2)

1. A mold for the manufacture of products from thermoplastics, comprising a fixed decorating plate and a movable mold, including a base, a housing with a matrix that is movable relative to it in the longitudinal direction, a runner system and a compensating mechanism, including an extruder product with an element, characterized in that , in order to increase product quality and increase productivity, the form is equipped with a central spring-loaded ejector, sprues made with a head, and a ytiop5 bushing of the head, and that Ornament sleeve is installed with the possibility of limited movement and interaction with the weaver, which is made with a collar, while the resistant sleeve of the product pusher and sprue is installed with the possibility of contact with the stationary decorating plate, and the distributing channels of the Bootnik Boii system are made at the end enclosures. 2. The form according to claim 1, characterized in that the elastic elements are made up of composite springs and washers of elastomer. BUT 0 five Fig2 22 8 1 j f-L 7 l - lF corner 4/1/1 i- / . (j) cr; iiuiir.ii, li. MaMN iiiKMH Tschrel I. lU iH CK jppfKTop B B t 1-a  I irizh D) (14Subscription VNIIPI G () with larstienio komip T,) GS (P for divide n. Chapters and discoveries 113035, Moscow, F 35. 1 Aushskaya Nab. 4; 5 Pr (1I (izhodstven-molygrafpcheskoe enterprise, Uzhgorod, Project. st. 4 Editor V. Lapk Zach) 3735: 1 I