SU797885A1 - Mould for forming thin-wall hollow polymeric articles - Google Patents

Description

The invention relates to the production of plastic products and can be used for the manufacture of hollow thin-walled products by injection molding.

Known injection mold for the manufacture of hollow thin-walled plastic products containing a movable and fixed plate, an intermediate plate with a punch placed on it £ 1J.

The disadvantage of the form is that a vacuum is formed between the product and the punch, as a result of which the product tightly covers the punch. In this case, when removing the product, it may be damaged.

The closest technical solution to the described is an injection mold for forming thin-walled hollow polymer products, containing a movable and fixed sprue plate, an intermediate plate with a punch fixed in it, in which a sign is placed with the possibility of longitudinal movement, made at one end, with a conical surface, I am in contact with the conical surface of the punch - and

However, in the well-known form, the sign located in the punch and used to communicate the space between the rod and the product with the atmosphere, acts as an ejector. When removing the smudges of a product made with a slight slope of the wall (the ejector can cause deformation of the product that is not yet sufficiently hardened.

The purpose of the invention is to improve the quality of products by eliminating damage to them during removal.

This goal is achieved by gem, which is in the injection mold for forming thin-walled hollow polymer products containing a Fixed gating and movable plate, an intermediate plate with a punch fixed in it, in which a sign is placed with the possibility of longitudinal movement, made at one end with a conical surface in contact with the conical surface of the punch, the movable plate is spring loaded relative to the intermediate plate in the direction of its movement with the mold connector, and the sign is fixed at the other end to the movable plate e and formed with longitudinal grooves for supplying air, the smaller cone base portion to the fixed plate directed w sprue plate.

In FIG. 1 shows an injection mold, section; in FIG. 2 - form in the open position; in FIG. 3 is a section BB in FIG. 2. ₁₅

The injection mold contains a fixed gate plate 1, a movable plate 2, an intermediate plate 3 placed on it with a punch 4 fixed in it, in which a sign 5 is mounted with the possibility of 20 longitudinal movement, fixed at one end in the movable plate 2, and its other end is made with the conical part, facing the smaller 'base to the gating plate, and in contact with the 25th cone of the punch. On the intermediate plate 3 is a removable plate 6, connected by rods 7 with a pusher plate 8, interacting with the emphasis of the machine.

Brackets 9 are installed on the movable plate 2 and the intermediate 30 3, between which the spring 10 and the restriction screw 11 are located.

Injection mold works as follows. 35

After the material is injected into the mold cavity and the corresponding exposure time, it is opened, the movable part moves away from the fixed gate plate.

At this moment, due to the spring 10 40, the movable plate 2 moves away from the intermediate plate (shape connector on the BB plane) and leads the sign 5 out of the punch 4. Due to the conical surfaces and longitudinal 45 grooves on the sign and punch, and on the sign, with a slight When removing it from the punch, the cavity under the product is connected to the atmosphere. The movement of the plate 2 under the action of the spring is limited by the restrictive screw ₅₀

11. The plate, upon reaching the pusher 8 of the fixed stop of the machine, stops, the link plate 6 stops moving with the rods 7 and the plate 6 is removed, and the movable part of the mold continues to move. .

After removing the product, the form closes and the cycle repeats.

The proposed form allows to obtain high-quality thin-walled products such as glass * or 'box *. By reducing the thickness of the wall of the product (in cases where the decrease in thickness does not harm the consumer qualities of the product), polymer materials can be saved 30-50% of the weight of the product. In addition, the application of the invention will speed up the production cycle of obtaining products on an injection molding machine by reducing the time you. hold

Claims (2)

The invention relates to the manufacture of plastic products and can be used for the manufacture of hollow thin-walled products by injection molding. A known casting mold for the manufacture of a thin-walled polysuit of plastic products, comprising a movable and fixed plate, is intermediate with a punch lj placed on it. The disadvantage of the mold is that a vacuum is formed between the product and the punch, as a result of which the product tightly covers the punch. In this case, when removing the product, it may be damaged. The closest technical solution to the described is a casting mold for forming thin-walled hollow polymer products containing a movable and fixed casting plate, an intermediate plate with a punch fixed in it, in which a sign made at one end with a conical one is placed with the possibility of longitudinal movement. surface konagaktiruyu, shchi with a conical surface of the puncheon I.; However, in the well-known form, the sign, which is in the punch and serves to communicate space between the rod and the product with the atmosphere, plays the role of a pusher. When removing a bone product made with a slight slope of the wall (The ejector may cause the product to deform yet not sufficiently hardened. The purpose of the invention is to improve the quality of the products by eliminating damage during removal. The goal is achieved by forming thin-walled hollow polymer products containing a fixed gating and movable plates, an intermediate plate with a punch fixed in it, in which the mark is placed with the possibility of longitudinal movement, The movable plate, which is mounted on the 7th end with a tapered surface in contact with the tapered surface of the punch, is spring-loaded relative to the intermediate plate in the direction of its movement when the form is disconnected, and the sign is fixed with the other end on the movable plate and made with longitudinal slots for supplying air, with a smaller base the tapered portion of the mark is directed toward a fixed gating plate. Fig. 1 shows a die-casting mold; Fig. 2 shows a mold in an open position; in fig. 3 shows a section B-B in FIG. 2. The casting mold contains a fixed gating plate 1, a movable plate 2, an intermediate plate 3 placed on it with a punch 4 fixed in it, in which a sign 5 is mounted for longitudinal movement, fixed at one end in the movable plate and its other end is made with a conical part , facing the smaller base to the gating plate, and in contact with the cone punch. On the intermediate plate 3 there is a plate 6, which is connected with the plate of the pusher 8, which interacts with the machine stop. On the movable plate 2 and intermediate 3 are installed brackets 9, between which is located the spring 1C and the restrictive screw 11. The casting mold works as follows. After the material is injected into the mold cavity and the corresponding shutter speed, it is opened, the movable part departs from the fixed gating plate. At this moment, due to the spring 10, the movable plate 2 moves away from the intermediate plate (the form connector on the plane B-B) and displays the sign 5 from the punch 4 Thanks to the implementation of not conical surfaces and longitudinal grooves on the sign and poinso, from the punch, the cavity under the product is connected to the atmosphere. The transfer of the plate 2 under the action of the spring is limited by an adjusting screw .11. The plate, when the pusher 8 reaches the stationary support, stops, the associated removal plate 7 stops moving with it 7, and moving to a part of the form continues to move. This will cause the connector to detach the form 4 on the A-A plane and remove the plate from the punch. After removal of the product, the form is closed the cycle repeats. The proposed form allows to obtain high-quality thin-walled products or a glass or box. At the expense of a smaller thickness of the wall of the product (in those rays, when the reduction in the thickness of the anosite did not damage the consumer qualities here), saving of polymeric materials 30 - 50 on the weight of the product is achieved. In addition, the application of the invention will speed up the production cycle of the product on the injection molding machine by reducing the time you -. handles. Invention Molding mold for forming thin-walled hollow polymer products containing a fixed casting and moving plates, an intermediate plate with a punch fixed in it, in which a sign is made with the possibility of longitudinal movement, made at one end with a tapered surface contacting the tapered surface of the plug, so that, in order to improve the quality of products by eliminating their damage during removal, the movable plate is spring-loaded relative to the intermediate plate in the direction its movement is at the connector of the form, and the sign is fixed with the other end on the movable plate and is made with sales slots for supplying air, with the lower cone part of the sign pointing towards the fixed gating plate. Sources of information taken into account in the examination 1. Technological equipment for cold stamping, pressing plastics and injection molding. Directory reference. Ed. V.D. Korsakov, NIIMASH, 1967, p. 123, tab. 80 2. Selection and design of tooling for manufacturing and casting under pressure, RTM 27-00-458-76. The Ministry of Engineering for the light and food industries and household appliances. VPO Soyuzorggekhavtomamatizi, M., p. 65, p. 49 (prototype) 5j Yu P Fi2.2 / (