RU6162U1 - INJECTION FORM FOR PRODUCTION OF THREADED POLYMER PRODUCTS - Google Patents

Abstract

1. Injection mold for the manufacture of threaded polymer products, containing a movable plate, a fixed plate, on which a matrix is made, made in the form of a platform with inserts, at least one rod for forming the internal contour of the product, an ejection system and a gating system with a metering unit, characterized the fact that the matrix has in the central part radial distributing channels located on its working surface and connected on the one hand to the metering unit, and on the other, to the forming cavity ca. made removable and symmetrically disposed circumferentially about the dispensing assembly, wherein each of the rods is adapted to reverse thread situated in its middle part and component of at least 1/3 of the length sterzhnya.2. The form according to claim 1, characterized in that the working part of each of the rods is made conical, while the angle of inclination is 2-3k axis of the rod.

Description

INJECTION FORM FOR PRODUCTION OF THREADED POLYMER PRODUCTS

The utility model relates to technological equipment for the manufacture of polymer products with internal thread, as well as protrusions having an external surface, and can be used for molding plastic products by injection molding.

Known injection mold for the manufacture of polymeric products (see AS USSR No. 1682194, V29C45 / 02, publ. 07.10.91), containing a movable plate, a fixed plate, on which a matrix is installed, made sliding in the form of internal and external semi-matrices , wedge clamping elements and inclined columns mounted together on a movable plate, a loading chamber, an injection piston, a gate) and an ejector system. The injection mold is equipped with a sprue stand mounted on a fixed plate with the possibility of interaction with distributing channels made on sliding semi-matrices from the side of the movable plate.

The design of the known injection mold is laborious, the presence of wedge clamping elements and inclined guide columns 3 magnify the dimensions of the matrix, reducing its usable area. This reduces the efficiency and reliability of the manufacture of polymer products.

IPC in 29 with 45/26

Also known is the injection mold for the manufacture of polymeric products (see ASSSSR No. 1199646329С45 / 26.45 / 44..23Л2.85), containing a movable plate, a fixed plate, on which a matrix is made, made of sliding wedge elements and the bottom element, rigidly fixed to a fixed plate, a means of moving the wedge elements, gating and pushing systems. In this case, the bottom element and the wedge elements are mounted with the possibility of contacting and relative movement along the guides.

The disadvantages of the known injection mold are the complexity of the matrix design, the inability to replace individual worn parts that form the cavity. This reduces the efficiency and reliability of the manufacture of polymer products and reduces the service life of the injection mold.

The closest technical solution to the claimed one is an injection mold for the manufacture of threaded polymer products (see USSR AS No. 1703476, В29С45 / 26.45 / 40, published on 07.07.92), containing a movable plate, a fixed plate, on which a matrix is installed, made in the form of a sliding platform with pressed-in inserts of wedge elements and a bottom element rigidly fixed on a fixed plate, a rod for forming the internal contour of the product, an ejection system in the form of a spring-loaded pusher mounted in a fixed plate, and gating system with a metering unit. The wedge elements are provided with protrusions, the tail of which has the shape of a truncated pyramid. The pusher is made in the form of a conical washer. The wedge element at the end of the pusher has a conical recess.

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the efficiency and reliability of the manufacture of threaded polymer products.

The inventive utility model is aimed at solving the problem of increasing the efficiency and reliability of the manufacture of threaded polymer products while increasing the service life of the injection mold.

To solve this problem in a known injection mold for the manufacture of threaded polymer products containing

a movable plate, a fixed plate on which a matrix is made, made in the form of a platform with inserts, at least one rod for forming the internal contour of the product, an ejection system, a gating system with a metering unit, according to a utility model, the matrix has radial distributing channels in the central part located on its working surface and connected on the one hand with the metering unit, and on the other hand with the forming cavity of the inserts made removable and located symmetrically around the circumference of It consists of a metering unit, each of the rods being made with a reverse thread located in its middle part and constituting at least 1/3 of the length of the rod along the length. In addition, the working part of the rod is made conical, while the angle of inclination is within 2-3 degrees to the axis of the rod.

The location in the central part of the matrix on its working surface of radial distributing channels connected to the forming cavity of the inserts placed symmetrically around the circumference relative to the metering unit reduces the dimensions of the injection mold and increases the active area of the matrix, increasing productivity.

during operation of the inserts, and not the matrix as a whole. In addition, the convenience of repairing the inserts and the reliability of the operation of the die and injection mold are increased.

The execution of a rod with a reverse thread allows you to form the internal contour of the product with a thread, which in the case of manufacturing, for example, dowels for construction, increases the multiplicity of their use and the pulling force, reduces the mechanical deformation of the inner surface of the dowel when screwing and unscrewing screws.

The utility model is illustrated by drawings, where in Fig.1 shows an injection mold, section; figure 2 - the working surface of the matrix, a plan view; in Fig.Z - rod for forming the inner contour of the product. The drawings have the following numerical designations:

1-motionless plate; 2-movable plate; 3-matrix;

- removable inserts; 5-radial distributing channels;

6-gating bush; 7- sleeve; 8- plate of rods;

9-rod for forming the inner contour of the product;

10-base plate; 1-pin guide column;

12- plate of pushers; 13- pusher; 14- spring loaded

rod pusher; 15-sleeve mounted on plate 12.

Injection mold for the manufacture of threaded polymer

products contains motionless} Yu plates} 1 and a movable plate 2. On

fixed plate 1 is installed matrix 3, made in the form

platforms with inserts 4 (figure 1). Matrix 3 has a central

parts radial distributing channels 5 located on its working

surface. Channels 5 are connected on one side with a node

removable and arranged symmetrically around the circumference relative to the metering unit.

The movable plate 2 is connected by a sleeve 7 to the plate 8, in which the rods 9 are fixed to form the inner contour of the product, and the plate, to the base 10, in which the column pins 11 are fixed, designed to guide the movement of the movable part of the injection mold. Each of the rods 9 is made with a reverse thread located in the middle part of the rod and comprising at least 1/3 of the length of the rod along the length (Fig. 3). The working part of the rod is made conical, while the angle of inclination lies within 2-3 degrees to the axis of the rod.

The ejection system consists of a plate 8, a base plate 10, pins 11 of the guide column, a plate 12 in which the pushers 13 are mounted and a spring-loaded pusher in the form of a rod 14 mounted in a sleeve 15 mounted on the plate 12.

The sprue system with a metering unit includes a sprue sleeve 6 and distributing channels 5.

The injection mold for the manufacture of threaded polymer products works as follows.

When filling the injection mold, the polymer material enters through the sprue sleeve 6 and distributing channels 5 into the mold cavity of the inserts 4, formed on one side by the inner surface of the inserts 4 and rods 9 on the other hand.

After filling the forming cavity with polymeric material and the required exposure time, the pushers 13 press on the movable plate 2. In this case, the plate of the rods 8 and the base plate 10 rise, with which the rods 9 with the product rise.

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Simultaneously with the lifting of the rod 9, a spring-loaded pusher in the form of a rod 14 presses on the central channel of the sprue sleeve 6 and breaks off the remaining polymer material.

Thus, the finished product is removed from the forming cavity of the inserts 4 and the compressed air coming from the compressor unit is removed to a receiving hopper (not shown).

When the injection mold is closed, the base plate 10 and the plate of rods 8 are lowered until they come into contact with the movable plate 2, providing movement to the initial position.

When moving the moving part, the guide pins 1 of the column provide centering of the movable 2 and fixed 1 plates with a matrix of 3.

Next, the cycle repeats.

The proposed design of the injection mold is more technological, simple and reliable in operation, it allows better use of the useful area of the matrix and the possibility of replacing worn parts - inserts, which increases its service life, improves the quality of finished polymer products. In addition, the replacement of inserts and rods to form the inner contour of the product allows the manufacture of polymer products of different sizes (length and diameter).

Claims (2)

1. Injection mold for the manufacture of threaded polymer products, containing a movable plate, a fixed plate, on which a matrix is made, made in the form of a platform with inserts, at least one rod for forming the internal contour of the product, an ejection system and a gating system with a metering unit, characterized the fact that the matrix has in the central part radial distributing channels located on its working surface and connected on the one hand to the metering unit, and on the other, to the forming cavity ca. made removable and symmetrically disposed circumferentially about the dispensing assembly, wherein each of the rods is adapted to reverse thread situated in its middle part and component of at least 1/3 of the length of the rod. 2. The mold according to claim 1, characterized in that the working part of each of the rods is made conical, while the angle of inclination is 2-3 ^o to the axis of the rod.