SU1645171A1 - Device for making swells at ends of thermoplastic tubes - Google Patents

Description

The invention relates to the manufacture of molding flanges and thickenings at the ends of these pipes and can be used for installation and special work with pipelines of thermoplastics.

The purpose of the invention is to improve the quality of the product.

FIG. 1 given the device at the stage of installation of the workpiece in the matrix and pressing it with a punch, a longitudinal section; in fig. 2 - the same at the heating stage; in fig. 3 - the same at the molding stage.

The device comprises a base 1, on which spring-loaded stops 2 with a matrix 3 located on them and an elastic element 4 are installed, a pressure plate 5 of a press (not shown),

connected to the punch b by means of a rotary grip comprising a pull 7, coaxially mounted on the pressure plate 5 with the possibility of rotation in a plane parallel to the pressure plate, equipped with a handle 8 for this purpose. On the end 7, the stop 9 is fixed, and in the upper part the punch 6 is made a groove 10, corresponding to the shape of the package RU 9.

On the punch 6, the forming sleeve 11 is installed with the possibility of reciprocating movement. The punch 6 in the upper part is provided with an annular collar 12, which is adapted to interact with an annular groove 13, formed on the forming sleeve 11. On the stationary

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fixed support plate 14 fixedly mounted pushers 15, provided with clamps 16 for fastening the forming sleeve 1 1. Fixers 16 are made in the form of Morse cones. The device is equipped with a heating plate 17, which can be mounted on the guide 1S and can be rotated before interacting with the punch b, the forming sleeve 11 and the die 3.

The fabrication of the bulges at the ends of thermoplastic pipes is carried out as follows.

In the initial position, the forming sleeve 11 is raised and the clamps 16 is connected to the pushers 15. Raise the pressure plate: together with the punch 6. A tubular billet is installed in the die 3, which can be cold or preheated. The pressure plate 5 is lowered. At the same time, the punch 6 is lowered, and after jth, as its collar 12, it touches the annular groove 13, the forming sleeve 11 will also be lowered down, held on the punch by friction forces.

The device is designed in such a way that the collar 12 interacts with the forming sleeve 11 after the punch enters the workpiece. In the process of moving, the punch 6 enters the internal cavity of the workpiece, protecting it from corrugation, and the forming sleeve 11, interacting with the end of the tubular workpiece, pushes it inside the matrix 3 until it stops in the elastic element 4, thereby pressing it (Fig. 1 , on right). In this position, a gap is formed between the forming sleeve 11 and the die 3, the recommended value of which is D 2-3 mm, and the upper surfaces of the punch 6, the forming sleeves 11 and the die 3 form one plane A. The handle 8 rotates the pull 7 by 90 ° until the stop 9 and the groove 10 are aligned. After that, the pressure plate 5 is raised. The stop 9 passes through the groove 10, leaving the punch 6 in place. Turn the heating plate around the axis 18 and set it on the plane A (Fig. 2). The tubular billet is heated together with the parts of the matrix 3, the punch 6 and the forming sleeve 11 which are in contact with it. After for

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The heating plates of the heating plate 1 7 are retracted to the side, the pressure plate 5 is lowered, the shape of which is a tubular billet and forming a thickening at its end (Fig. 3). In this case, the abutment 9 passes through the groove 10, and the upper part of the billet, deforming, penetrates into the gap between the forming sleeve 11 and the die 3, and as the pressing plate 5 is lowered, this gap increases. In this case, the matrix 3 is lowered, overcoming the resistance of the spring-loaded stops 2 and creating a back pressure. Due to this, during the molding process, the preform is always in a three-axis compressed state, which improves the quality of the product. The molding is completed when the matrix 3 is supported on the elastic element 4. After the required holding time, the pressure plate 5 is lifted by turning the preliminary handle 8. In this case, the stop 9 is rotated relative to the groove 10, connecting the punch 6 with the pressure plate 5. The finished product also rises , carrying the forming sleeve 11, and the matrix 3 under the influence of the spring-loaded stops 2 returns to the initial state. During the lifting process, the molding sleeve 11 contacts the push rods 15 and stops, thereby pushing the finished product from the punch 6. Then all the operations are repeated.

The use of a device for its implementation improves the quality of the finished product, providing a counter-pressure in the molding zone.

Claims (1)

1. An apparatus for making nipples at the ends of thermoplastic pipes, comprising a base with spring-loaded supports, a matrix, a punch, a support plate, a punch associated with the punch, a forming sleeve with pushers and an elastic member, characterized in that, in order to improve the quality products, the matrix is installed on spring-loaded stops, and the elastic element is placed on the base with the possibility of interaction with the lower part of the matrix, while the pushers are fixed on the base plate and provided with retainers for the connector with a forming sleeve. 2, the device according to claim. Characterized in that the pressure the plate is provided with a swivel grip for detachable connection with a punch. FIG. one FIG. 2