SU1360836A1 - Arrangement for drawing metal - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the drawing of metals. The purpose of the invention is to increase productivity by increasing the ductility of the metal. The device contains fiber 1, connected to power supply 5, sliding contacts 2,3,4 for heating workpiece 7. Contacts 2 and 3 are located before the die, and contact 4 is located after it. Contact 3 is made in the form of a tube with an electrically insulated internal surface, installed coaxially with wire 1. Workpiece 7 passes through it. Contact 4 is provided with input 8 and upper Eight terminals with 9 terminals. Pin 4 is connected by a jumper 10 to output terminal 9, and input terminal 8 is connected to power supply 5. o (Oh P7 / VW oe o: o 00 with O5

Description

When pulling the workpiece 7 through the player, the current is brought to a safe voltage with the help of a transformer 11. With the help of sliding contacts, the current is supplied to the workpiece. Making the sliding contact 3 in the form of a tube made of a material having a high optical resistance, such as tungsten, provides an increased degree of heating of the workpiece. This increases its plasticity. In addition, the presence of electrical insulation vid.

one

The invention relates to the processing of metals by pressure, in particular to the drawing of metal. The purpose of the invention is to increase productivity by increasing the plasticity of the metal.

The drawing shows the proposal. device, general view.

Metal drawing device

consists of die 1, sliding contacts 2-4. Contacts 2 and 3 are located before portage 1, and contact 4 after it. Sliding contacts 2 and 3 are connected on one side to source 5 of the safe voltage supply through switch 6, and on the other to the workpiece 7. Contact 3 is made in the form of a tube with an electrically insulated internal surface installed coaxially with volta 1. with respect to it, the workpiece 7, Tube - contact 3 can be made of a high-resistance material, for example, stainless steel, provided with ends - input 8 and output 9 terminals. The sliding contact 4, located after the die 1, is connected by a jumper 10 with the output terminal 9 of the sliding contact 3, the input terminal 8 of which is connected to the power supply 5. Voltage safety is created by connecting power supply 5 through a step-down transformer j11. Such a connection scheme for the sliding contacts 2-4 between themselves and with the power source 5 and the wire 7 being processed allows

the inner surface of the tube allows current to flow in it only in one direction, and in the workpiece in the opposite direction. In this case, the magnetic fields around them displace the current on the surface of the workpiece, increasing the density of the current flowing in it. This helps to remove the defects of the crystal lattice from the surface layer of the workpiece 7, increasing its strength. 2 z.p, f-ly, 1 ill.

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It is not necessary to heat up the entire cross section of the workpiece 7, but only its surface layers. The latter is connected with the fact that in the tube - contact 3, electrically insulated from the inside, the current flows in one direction, and in the workpiece 7, which slides inside it, the current flows in another direction. The magnetic fields around them, superimposing, displace the current on the surface of the workpiece 7, increasing the density of the current flowing through the surface layer of the workpiece 7.

In addition, the presence of the sliding contact 4 after die 1 allows current to pass through the workpiece 7 up to its exit after the die 1. This means that at the moment of plastic deformation and high temperature during compression of the workpiece 7 1 additionally supplies Joule heat, -1 as well as an intensive electronic effect on the process of the ordered arrangement of ions in the crystal lattice located in the surface layer of the workpiece 7. This contributes to the removal of cris defects allicheskoy lattice (vacancy, dislocation) of the surface layer of the workpiece 7.

The metal dragging apparatus operates as follows.

When pulling the workpiece 7 through fiber 1 when the switch 6 is turned on, the alternating current from the power source 5 is brought to a safe voltage by means of a step-down transformer 11. Next, using the sliding contacts 2 and 3, the alternating current is supplied to the workpiece 7 being processed. As a result, the current passes through the workpiece 7 to the portage 1, the workpiece 7 after processing in the wire 1 and through contact 4. Then the alternating current passes through jumper 10 to the output terminal 9 of the sliding contact 3. And from the input terminal 8 of the contact 3, the current then flows through a step-down transformer 11 to the source 5 of the power supply. When making a sliding contact, the tube 3 of a material having high ohmic resistance (tungsten, stainless steel), the heater consisting of the sliding contact tube 3 and the workpiece 7 inside it heats up with a greater degree of heating. This increases the ductility of the blank, the strength of its surface layer.

The invention makes it possible to increase the productivity by 1.5 times and the strength of the surface layer of the workpiece by 50%.

Editor I. Shulla Order 6176/12

Compiled by A. Morozov Tehred M. Khodanych

Corrector

Circulation 731 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design,. four

ten

608364

Claims (3)

1. A device for drawing metal, containing fiber, means for heating metal in the form of sliding contacts, connected to a power source and installed before and after a die, such as 4Td, in order to increase productivity by increasing the plasticity of the metal, the device is equipped with an additional sliding contact located directly in front of the wire, and made in the form of an installed tube with an electrically insulated internal surface and input and output terminals, located and at its ends in accordance with the drawing voltage, the sliding contact after the drawing being connected by a jumper to the output terminal of the tube, and its input terminal is connected to the power supply. 2.5 device POP.1, tl k 4 a-y shche e with the fact that the tube is made of a material with high ohmic resistance. 3. A device according to Claims 1 and 2, characterized in that the tube is made of tungsten. 20 25 Proofreader S. Shekmar