SU1219394A1 - Casting mould for manufacturing polymeric articles with external thread - Google Patents

Description

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The invention relates to injection molds for the manufacture of thermoplastic articles with an external thread, having a central and offset from the center holes of various configurations.

The aim of the invention is to enable the manufacture of products with an eccentric open hole and an increase in the productivity of the mold.

FIG. 1 shows the shape of the connector, view of the movable part; in fig. 2, section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 - form in the open position; in fig. 5 - section bb-la fig. 3; in fig. 6 is a view of FIG. one .

The form contains a movable and fixed half-form. The fixed half-form includes a plate 1 for fastening the machine to the table and a gating plate 2 for inserts 3 forming the head of the product, made in the form of a threaded plug with a slotted groove. In the sprue plate 1 fixed centering columns 4,

The mechanism for turning out products is made with two nodes 5 with light-tapping, spring-loaded cartridges. 6 Nodes are located on both sides of the form. Plate 7 of each node has a recess. (Fig. 3) for placement of a gating system therein. There are also holes S (Fig. 5) for the central sprue in which the spring-loaded ejector 8 is located.

The movable half-form includes a base consisting of two plates: a plate 9 for attachment to the table and a plate 10 for mounting signs 11 forming a hole, pushers 12 (Fig. 2), which are connected to a support plate (plate 13 with guide grooves 14 V The guide grooves 14 are equipped with a movable plate 15 of the dies. To facilitate reciprocating the plate 15 of the dies, the lower guide grooves have support rollers 16. The plate 15 of the dies is made with a number of thread-forming slots 17 equal to twice the number of characters 11.

On the base plate 13, a mechanism 18 for reciprocating the movable plate of the matrices 15 is mounted — a double acting pneumatic cylinder. Piston rod at po5

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The power of the bar 19 is rigidly connected to the movable plate of the dies 15. The base plate 13 is connected by a lever 20 to the slide valve of the sequential connection 21 by means of a ratchet joint.

The form works as follows. When the mold is opened by the pushers 12, the support plate 13 stops, as a result of which the signs 11 are removed from the thread recess jacks 17. An I-shaped connector is formed, which is slightly higher than the height h.

The base plate 13 with the help of the lever 20 when opening the form turns the snoring mechanism of the crane 21 and its valve at a certain angle cL. At the same time, compressed air from the 2Q network through the spool orifice enters the cavity of the pneumatic cylinder 18. The piston rod moves the guide plates 15 with the threads and the gating system to the free zone through the guides 14 and the rollers 16. unit of the mechanism for turning out products (in Fig. 2, conditionally to the left).

The extreme positions of the plate 15 of the dies are controlled by limit switches, which command to close the mold and start unscrewing the items.

In these positions, a series of threaded 35 ml slots 17 of the plate 15 of the arrays with articles and the gating system are installed opposite the respective chucks 6 of the twisting unit and recesses of H and 5. The free row of threaded nests returns to the casting zone and is installed opposite the inserts 3 .

When the closure of the form locks the ratchet mechanism slips, providing the valve immobility.

In the closed position at the moment of pouring and dispensing, the corresponding knot of the twisting mechanism is simultaneously turned on.

The cartridges 6, with their projections, are inserted into the recess of the slotted groove of the articles: they are unscrewed from the thread-forming slots, while detachment from the supply runners. The time of this 55 operation is controlled by a time relay.

Next, a re-opening is performed in which the lever 20

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by means of the ratchet joint, rotates the spool by the angle o (, aligning the holes for converting the rod of the pneumatic cylinder 18 in the opposite direction.

Thus, with each new, ohm rasmopanii on the value of H, the spool turns on a constant

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angle o (, aligning the holes for each cavity of the cylinder alternately with the compressed air line.

5 After removal of the movable plate 15 of the dies, the spring-loaded cartridge 6 and the ejector 8 remove the product 4 and the gating system.

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Claims (2)

1. INJECTION FORM FOR PRODUCING POLYMERIC PRODUCTS WITH EXTERNAL THREAD, containing a sprue plate, a movable matrix plate with thread-forming nests, plate pushers, a base with signs installed in it and a product turning mechanism, characterized in that it is made with a view to ensuring production eccentrically located hole and increase mold productivity, it is equipped with a base plate with guide grooves in which a matrix plate is installed with the possibility of reciprocating movement signs, while the signs are rigidly fixed at the base, the support plate is connected with the pushers, and the matrix plate is made with the number of thread-forming nests equal to twice the number of signs. 2. The form of pop. 1, characterized in that the mechanism of product turning out is made with two turning out nodes located on both sides of the form. SU. „, 1219394 1 12