SU632427A1 - Press tool for continuously extruding blanks - Google Patents

Description

one

The invention relates to the processing of metals by pressure extrusion and can be used for pressing elongated blanks under conditions of active friction.

A known pressing tool for hydrostatic extrusion of long articles, comprising a high pressure container, a compacted matrix and a feed mechanism for blanks. The axial movement of the workpiece is carried out by reciprocating hollow punches with grippers. Moving the liquid punches and maintaining the high pressure of the liquid in the container is carried out by special hydraulic drives 1.

A disadvantage of this device is the complexity of the design and the difficulty of operation, due to the need for precise synchronization of the movement of the hollow punches with the grippers, as well as the presence of a hydraulic drive with a large number of seals 1.

The closest to the proposed invention is a pressing tool for continuous extrusion of billets containing a conical cavity container and matrix 2 mounted on a press frame with the possibility of axial reciprocating displacement of the container. In this tool the concent-ner is made of matching cavity of the walls, each of which consists of a set of ilosko-parallel wedges, directly transmitting the working pressure from the actuator to the deformable material through forces t rheni on its lateral surface. With the container running, the walls of the cavity move along the body guides. In doing so, considerable friction forces arise between the walls and the body guides; proportional deformation forces.

A disadvantage of this device is that the resulting frictional forces increase the total pressing force required, and the presence of a large number of interfaces between the container elements and the matrix complicates the adjustment.

Claims (2)

The aim of the invention is to reduce the pressing force and simplify the set-up when extruding the blanks. This goal is achieved by the fact that the npe, iuiagable tool is provided with a container coaxially located at the lead-in end and connected with it by means of spring-loaded grip grips for moving the workpiece in the direction of pressing during the forward movement of the container, as well as interacting with the gripper placed on the frame above the collet grip collet clamp to lock the workpiece during the return movement of the container. The drawing shows the proposed device, a General view. The device comprises a container 1 for active pressing with a conical cavity, installed with the possibility of reciprocating movement along the axis, and a matrix 2. The container cavity facing the matrix 2 is cylindrical. At the lead-in end of the container 1, a collet grip 3 is installed, the body 4 of which is connected to the container by means of spring loaded t 5 g, which provide a constant pressing of the collet cam 6 against the lateral surface of the workpiece 7 and to the end of the container 1, and the collet clamp 8 is installed on the frame of press 9. The collet cams 10 of the clamp 8 are connected. With the collet cams 6 of the gripper 3 by the compression spring 11, which constantly presses the cams 10 against the lateral surface of the workpiece 7. The housing 4 of the gripper 3 is connected to the crosspiece (not shown). The tool works as follows. During the downward traverse (left half of Fig. 1), the workpiece 7 is captured by the cams 6 of the collet grip 3, and together with the container 1, it moves to the die 2, the workpiece 7 becomes unstressed and it fills the cavity of the container 1. When Further, during container 1, due to the inverse angle c of its conical cavity, active forces of friction arise on the surface of the workpiece 7. The material being processed is seized by the container cavity and extruded into the matrix 2 point. At the same time, the workpiece 7 freely leaves the collet of clip 8, the jaws 10, which at this time is decompressed. 7 During the return stroke, the traverse is up (half of the right in Fig. 1), the cams 6 of the collet grip 3 are unclenched and released the workpiece 7, and by means of the compression spring 11 push the collet cams 10 of the collet clip 8 to the workpiece 7, prevented. movement of the workpiece. up. This cycle is repeated several times until the entire lengthy billet 7 is extruded into matrix 2. The use of isobregnation will reduce the required pressing force (depending on the degree of deformation) by 2-5 times and greatly simplify the tool setting. The tool is simple and reliable, which makes it possible to use it on standard press equipment and to extrude hard-to-deform steels and alloys at hot deformation temperatures. In addition, it can be used in a production line in installations for the continuous casting of ingots. Claims Pressing tool for continuous extrusion of blanks containing a container with a conical cavity mounted on a press frame with the possibility of axial reciprocating movement and characterized in that, in order to reduce the pressing force and simplify set-up, it is provided coaxially placed on the lead-in end of the container and connected with it by means of a spring-loaded clamping grip to move the workpiece in the direction of pressing when moving the container JHom, as well as modifying with a grip placed on the frame above the collet grip collet clamp DVT of the workpiece stopper during return movement of the container. Sources of information taken into account in the examination: 1.Patent of England No. 1167725, M. Cl. In Sp, 2. USSR author's certificate J4o 533418, CL. B 21 C 27/00, 1976. --j