SU1690938A1 - Extrusion die - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to die tooling for the implementation of reverse extrusion with the use of the active force of friction. The goal is to increase the reliability of the stamp. The stamp comprises upper and lower plates, which are interconnected by a guide bushing, in which power cylinders are placed, the plungers of which are guide columns. Inside the sleeve, a shrouded yoke is installed with a matrix housed therein that is axially displaceable. A ring-shaped cavity is formed above the bottom plate under the matrix, which communicates with the cavities of the hydraulic cylinders formed in the guide sleeve. In the upper part of the hydraulic cylinders in the threaded holes, there is a matrix speed controller, made in the form of replaceable nut-plunger units with different sections of plungers. When re-adjusting the punch to obtain parts of a different configuration that requires a different speed of movement of the die, the nuts and plungers are replaced with a set with different cross-sectional dimensions. 1 il. SP-fe

Description

The invention relates to the processing of metals by pressure and can be used in metal processing industries in the manufacture of hollow articles by extrusion.

The purpose of the invention is to increase the reliability of the stamp.

The drawing shows a stamp at the beginning and end of the stroke, a longitudinal section.

The stamp contains upper 1 and lower 2 plates interconnected by means of a guide sleeve 3, a hydraulic cylinder and a guide column (plunger) 4. A punch 5 is rigidly fixed on the upper plate 1. A lower plate 2 mounted on the press table 6, attached to the shielded yoke 7 with the matrix 8 placed therein, consisting of three parts and having the possibility of axial movement in the hole of the shrinkable yoke 7. Above the bottom plate 2, below the matrix 8 and the pressure ring 9, sealed by rings, is formed by an annular cavity 10, filled with working fluid, and through channel 11 communicating with the cavities of hydraulic cylinders 12, made in the guide sleeve 3. In the upper part above the cavities of the hydraulic cylinders, the guide sleeve 3 has threaded holes in which the matrix speed controller is mounted; replaceable knots of a nut 13 and plunger 4. In

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matrix 8 on a stand 14, placed E; The central hole in the bottom plate 2 is coaxially with the ejector 15, a preform 16 is set.

The stamp works as follows.

The workpiece 16 is installed in the split matrix 8 on the stand 14. During a working stroke, the top plate with the punch B and rams 4 fixed on it is lowered, as a result of which the punch 5 is inserted into the workpiece 16, and the plunger 4 squeezes the working fluid from the cylinder cavity 12 . channels 11 into the annular cavity 10 under the split die 8. The volume of the working fluid displaced by the plungers 4, acting through the pressure ring 9 on the lower end of the split die 8, causes it to move opposite to the movement of the punch 5 and plunger 4. The finished product is pushed out by the ejector 15. At in the reverse direction, all the working parts of the stamp return to their original position.

When re-adjusting the punch to extrude parts of a different configuration that requires a different speed of movement of the split die 8, the set of guide nuts 13 and plungers 4 are changed.

The volume of the cylinders and the diameter of the plungers are chosen so that the magnitude of the excess of the speed of displacement of the die relative to the speed of the outflow of the workpiece material exceeds by 25-30%

Structural parameters of the executive bodies of the stamp based on this

requirements can be determined according to the following expression

P 1.3 (F3-Fn) Pr.

where Pr.pl. - cross section of a hydraulic plunger;

Рз- area of the working surface of the workpiece;

RC is the area of the working end of the master pu- sonon;

n is the number of hydraulic cylinders. Thus, the proposed stamp design provides adjustment of the matrix movement, while maintaining the simplicity of the design.

Claims (1)

Formula isobteni A punch for extrusion using active friction forces, comprising an upper plate, a carrying punch, a lower plate connected to the upper plate by means of guide elements and columns made in the form of plungers and power cylinders filled with working fluid and connected by channels with a cavity under the lower end of the matrix, as well as a matrix speed regulator, characterized in that increasing the reliability of operation, the guide elements are made in the form of nuts, and the regulator of the speed of movement of the die is made in the form of interchangeable assemblies formed by sets of said nuts and plungers with different cross sections. //////////////// eight 2