SU1611483A1 - Method of producing process tools for drawing under conditions of hydrodynamic friction - Google Patents

Abstract

The invention relates to drawing production, in particular to methods for producing a tool that provides a high lubrication pressure in a deformation zone. The purpose of the invention is to simplify the manufacture and expand the technological possibilities of using the tool by providing dragging of hard-to-deform metals. The method includes machining the pressure tube in the environment of a chemical activator, grinding the end surface of the tube with a bimetallic high-strength core product covered with a layer of highly ductile metal, and pressing the pressure tube with the end surface against the working die in the housing through the clamping element. In addition, the pressure tube is made of two parts and the end faces of the joint are polished with bimetallic products, the cores of which are covered with layers of different metals.

Description

The invention relates to drawing production, in particular to methods for producing a tool that provides a high lubrication pressure in a deformation zone.

The purpose of the invention is to simplify the manufacture and expand the technological possibilities of using the tool by providing dragging of hard-to-deform metals.

The method includes machining the pressure tube in a chemical activator environment, such as glycerin, grinding the end surface of the tube with a bimetallic product made of a high-strength core covered with a layer of highly plastic metal, and pressing the pressure tube with the end surface against the working die in the housing through the clamping element. In addition, the pressure tube is made of two parts.

and the end faces of the joint are ground with bimetallic products, the cores of which are coated with layers of different metals, for example copper and zinc. During the grinding process, as a result of the adhesive interaction, the highly plastic metal is transferred to the surface of the tube being machined. At the same time, the surface roughness is reduced; Since the high-strength core of the bimetallic product increases the contact pressure during processing. The operation of applying a layer of highly plastic metal to the butt face of the tube lasts less than 1 minute in time, and the coating formed on the surface of the tube has a strong adhesion to the metal of the tube.

When drawing some types of wire, such as high-strength steel-aluminum-miniature, pressure pipes are required.

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100 mm long and more. Drilling a conduit for passing wires in such tubes requires the use of special drills and is a labor-intensive operation. Increasing the length of the pressure tube through the use of two or shorter tubes simplifies tool manufacture. The joints of these tubes are sealed by applying a layer of highly plastic to their contact (working) surfaces. The highest degree of sealing of pressure tubes is achieved by treating the contact surfaces of two tubes with articles made of different metals, forming a common diffusion zone at operating temperatures of the tool. When such a zone is formed, the degree of sealing of the pressure tube corresponds to a solid tube.

Example 1. A bar made of U7 steel with a diameter of 24 mm is used to manufacture a pressure tube. The bar is machined to a diameter of 22 mm and a 95 mm long billet is cut by turning on a turning machine. In the manufacture of the workpiece, glycerin is supplied to the cutting zone instead of coolant. After drilling a longitudinal axial hole with a diameter of 6.0 mm, forming a channel of the pressure tube, the end surface of the tube is polished using beams of high-strength steel-copper wire. Bundles with a total length of 100 mm at the ends. A length of 30 mm is plated with steel shells and fixed around the circumference of two flanges mounted on a shaft connected to the engine.

A copper coating with a thickness of 8 μm is obtained on the end surface of the pressure tube for 15 seconds. The coated pressure tube is quenched in oil after being heated in a furnace with a protective atmosphere and used for drawing steel-aluminum wire.

Example 2. Using the conditions of example 1, two pressure tubes with a length of 50 and 35 mm are fabricated. The first tube is polished using high-strength steel-copper wire bundles, the second one is polished using high-strength galvanized wire bundles. In this case, the grinding of the pressure tube with bundles of zinc-coated steel wire is carried out after

quenching pressure tube. Both tubes are used in the same instrument, connecting them into one element along the end surfaces with the coatings.

The proposed method simplifies the manufacture of the tool and expands the technological possibilities of using the tool, since the method of its manufacture provides a high degree of sealing and, consequently, a higher

lubricant pressure, which means that the tool can be used for drawing bimetallic wire, hard-to-deform little plastic wire, etc.

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Claims (2)

1. Method of making technological tool for dragging in hydrodynamic friction mode, including machining the pressure tube, forming on the end surface of the tube a thin layer of highly ductile metal and pressing the pressure tube with the end surface against the working die in the housing through a clamping element, characterized in that, in order to simplify manufacture and expand the technological possibilities of using the tool by dragging hard-to-deform metals, mechanical The pressure tube treatment is dried in a chemical activator, for example, glycerin, after which the end face awn bimetallic tube is subjected to grinding product of high strength core coated with a layer of highly plastic metal. 2. Method pop. 1, characterized in that the pressure tube is made of two parts, the end surfaces of the joint which are polished with bimetallic products, the cores of which are covered with layers of different metals, such as copper and zinc.