SU664705A1 - Die assembly for reverse extrusion - Google Patents

Description

I

The invention relates to the processing of metals by pressure by the method of reverse extrusion, in particular to a pressing tool.

A known matrix node for inverse extrusion, content of a nress-stamp and a matrix fixed on it, having an expansion cone on the side surface, a backing ring and an elastic casing enclosing the matrix and press shtam with an internal conical surface interacting with the spacer cone of the matrix.

The disadvantage of this construction is that during pressing, the thrust to a given size of the elastic cage is provided due to significant specific pressures arising on its contact surface, which leads to premature exit of the entire assembly.

The aim of the invention is to increase durability.

This goal is achieved by the fact that, in the proposed matrix node, the matrix is installed with the possibility of limited movement in the axial direction and is fixed against rotation, its expansion cone is reversed, and the elastic casing is connected to the press-clip with a bayonet lock and locking pin.

On fng. 1 shows the proposed matrix node; a general view; in fig. 2 is a cross section along A-A in FIG. 1. At the end of the hollow ram 1, which performs the functions of the die holder, the backing ring 2 and the die 3 are installed coaxially, having an expansion cone on the side surface 4. The die 3 is connected to the ram 1 by an elastic holder 5, the inner surface of which has a conical annular juice 6, interacting with the spacer cone 4 of the matrix 3. Around the circumference of the matrix 3, the ram 1 and on the mating parts of the inner surface of the cage associated with them are a series of alternating protrusions 7 and grooves 8 intersected by rings Vym transverse grooves together forming a bayonet-type locking compound.

On facing ends of the press shtamp 1 and matrix 3, two cylindrical sockets are made, and in the backing ring 2 there are two through holes of the same diameter, the axes of which are parallel to the axis of the matrix node and equidistant from it. In the indicated nests and holes x two longitudinal fixing clips 9 are placed. At the same time,

the through hole of the yoke 5 and the press stamp 1, which is perpendicular to the axis of the matrix assembly, has a transverse locking pin 10.

The sector rows of the elastic cage are made in such a way that the length of each sector pitch is somewhat less than the width corresponding to its transverse annular groove into which it enters.

Thus, gaps are created between the protrusions of the cage, the grooves of the matrix and the ram, which provide limited axial non-displacement of the matrix 3 and the backing ring 2 inside the cage 5. The number of rows of the bayonet connection is determined from the conditions of the required strength of the matrix node connection of the holder with the matrix and two-slot - the holder with the press stamp).

Matrix node works as follows. When assembling the assembly, the pins 9 are inserted as far as they will go into the end nests of the press-clamp 1 clamp. Then the protrusion of the clamp 5 is inserted into the grooves 8 of the bayonet locking joint and the latter is pushed into the press stamp 1 until it stops, and then placed inside 3 backing ring 2, aligning the holes in it with the pins 9, and then the matrix 3. The sleeve 5 is rotated around its axis until the bayonet locking joints are completely closed, and the protrusions of the holder 5 enter the transverse grooves of the matrix 3 and the ram 1. In end of the assembly in the transverse hole The ferrule 5 and the ram 1 insert the locking pin 10.

During the working cycle of extrusion, the force imparted by the press stamp 1 to the workpiece, through the matrix assembly, acts on the latter, as a result of which the matrix 3 and the backing ring 2 alternate towards the press stamp 1 until they stop against each other, slipping on the pins 9 preventing these from turning parts around the axis of the node. In this case, the gaps that existed prior to the beginning of the cycle between the matrix 3, the back-up ring 2 and between the elements of the bayonet locking connections are selected.

and the expansion cone 4 of the matrix 3, the action of the conical annular over the juice of the holder 5, spreads the latter until it reaches the diameter of the internal cavity of the container. After the product has been extruded, the load on the die 3 is reduced, and the elastic sleeve 5 takes on its original dimensions, which prevents the tool from jamming during the return stroke of the press clamp 1.

The disassembly of the matrix assembly is carried out in reverse order.

The sectoral connection of the bayoietic type, which connects the holder to the die and the press-stamp, ensures quick and convenient assembly and disassembly of the matrix assembly, increases the reliability of the fastener and thereby increases the service life of the pressing tool. The presence of pins locking the matrix from the turn around the axis of the matrix node allows for multi-die-casting and obtaining products of complex asymmetrical sections without disturbing their geometrical dimensions, i.e.

achieve improved product quality. At the same time, the transverse fixing pin, which additionally connects the press-stamp with the clip, prevents the latter from spontaneously turning and exiting

from engaging with the ram during operation.

Claims (1)

Invention Formula An inverse extrusion matrix assembly comprising a ram and a matrix attached thereto, having an expansion cone on the lateral surface, under-. the cladding ring and the surrounding matrix and the press stamp have an elastic sleeve with an internal conical surface that interacts with the spacer cone of the matrix and is molded so that, in order to increase its durability, the matrix is installed with the possibility of limited movement in the axial direction and fixed from the rotation, its expansion cone is reversed, and the elastic holder is connected to the press-stamp by a bayonet lock and locking pin.