RU2639274C2 - Working body for expanding hollow and tubular billets - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: working body is made in the form of an ice bar whose end part facing a punch contains a water-insoluble particulate material.

EFFECT: expansion of technological possibilities of operations for expanding hollow and tubular billets with minimal cost.

2 cl, 1 dwg

Description

The invention relates to the processing of metals by pressure, in particular to the distribution of hollow and tubular workpieces, and can be used in aviation, shipbuilding and related industries.

Known stamp for forming tubular blanks (patent RU No. 2176169, published November 27, 2001). An elastic piston is installed in the stamp between the punch and the granular working fluid, which prevents the granular working fluid from entering the gap between the parts of the stamp. The disadvantages of such a stamp include the rapid wear of the elastic piston and the complication of the design of die tooling, which leads to its cost increase.

The closest in technical essence and the achieved technical result is a working fluid for the distribution of hollow and tubular blanks, which is made in the form of an ice rod, described in patent RU No. 120898, published on 10.10.2012 and adopted by the applicant as a prototype. The disadvantage of such a working body in the form of an ice rod is the extrusion of part of the ice of the rod, which is under high pressure, into the gap between the punch and the die, which leads to a loss in the force of distribution of the pipe wall, an increase in the stroke of the punch and requires the use of sealing elements.

The objective of the invention is to prevent extrusion of part of the ice from the ice rod, which is the working fluid, into the gap between the punch and the die.

In the process of solving this problem, a technical result is achieved, which consists in preventing the extrusion of part of the ice from the ice rod, which is the working fluid, into the gap between the punch and the matrix.

The specified technical result is achieved by the fact that in the working fluid for distributing hollow and tubular blanks by the pressure of the punch on a rigid matrix made in the form of an ice rod, according to the invention, the end part of the rod facing the punch contains water-insoluble bulk material.

In addition, water-insoluble bulk material is frozen into the end portion of the ice rod. And in addition, the end part of the ice rod contains bulk material from the end of the rod along its length to a distance of not more than 10 mm.

New in the claimed device is that in the working fluid for distributing hollow and tubular blanks by the pressure of the punch on a rigid matrix made in the form of an ice rod, according to the invention, the end part of the rod facing the punch contains water-insoluble bulk material.

The inventive device is characterized by a combination of the following essential features.

Restrictive: the working fluid for the distribution of hollow and tubular workpieces by the pressure of the punch on a rigid matrix, made in the form of an ice rod.

Distinctive: the end part of the shaft facing the punch contains water-insoluble bulk material.

Due to the fact that the end part of the rod facing the punch contains water-insoluble bulk material, it has been experimentally established that the bulk material prevents the extrusion of part of the ice from the ice core and its exit into the gap between the punch and the matrix.

In addition, it is most technologically advanced to introduce bulk water-insoluble bulk material into the core when freezing water during core formation. In addition, the fact that the end part of the ice rod contains bulk material from the end of the rod along its length at a distance of not more than 10 mm, provides a sufficient amount of bulk material in the ice rod for its performance.

The invention is illustrated in the drawing, which shows a stamp for the distribution of tubular blanks. In this stamp the proposed working fluid is applied.

The proposed stamp contains a detachable matrix 1, mounted in a rigid case consisting of a base plate 2, an outer cage 3, a punch 4. A matrix 5 is placed a tubular blank 5, inside of which there is a working fluid 6 made of an ice rod, the end part of which is facing to the punch 4, contains a water-insoluble bulk material, such as sand, chalk. The amount of water-insoluble bulk material is 10-60 mass percent. The length of the section of the rod from its end with frozen-in bulk material is not more than 10 mm, for example 6 mm.

The stamp works as follows. A water-insoluble bulk material, such as sand, chalk, is added to the water inside the tube stock and frozen. In the prepared matrix 1, a tubular billet 5 is inserted, inside which a working fluid 6 is made, made of an ice rod, the upper part of which contains bulk material in an amount of, for example, 30 weight percent. By moving the press slider with a force P (not shown in FIG.), The punch 4 is moved. From the punch 4, the force P is transmitted through the working fluid to the deformation zone of the tubular workpiece, as a result of which the pipe is distributed. Then the punch 4 is lifted up, the matrix 1 is disassembled and the finished part is taken out with the working fluid 6, which subsequently melts due to the positive temperature of the working room.

Claims (2)

1. The working fluid for the distribution of hollow and tubular workpieces by pressure of the punch on a rigid matrix, made in the form of an ice rod, characterized in that the ice rod contains water-insoluble bulk material in an amount of 10-60 wt.%, Which is located in the end part of the rod on a length of not more than 10 mm from its end, while the rod is made with the possibility of arranging its end part facing the punch. 2. The working fluid according to claim 1, characterized in that the water-insoluble bulk material is frozen into the end part of the ice rod.

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