SU996046A1 - Bimetallic articles production method - Google Patents

Description

(54) METHOD FOR PRODUCING BIMETALLIC PRODUCTS

one

The invention relates to the processing of metals by pressure and can be used in the blank production of the engineering industry in the manufacture of bimetallic products, for example, support rolls, slide bearings, etc.

A known method of manufacturing support rolls, according to which, before heating a bimetallic billet consisting of an axis and a bandage, the annular gap between them is sealed by welding and a vacuum is created in it, after which the bimetallic pair parts are subjected to joint plastic deformation I.

However, sealing the annular gap by welding and creating a discharge in it limits the use of the method under production conditions, causes a high labor input for the production of a bimetallic billet and the need to use special equipment for evacuating the joint zone.

The closest is the method of obtaining bimetallic products by

making blanks from shell and core materials and their subsequent assembly by deforming the shell material heated to the forging temperature of the cold blanks from core material. The assembly process in this method is essentially a reverse extrusion process, where, instead of a punch, a cold billet of core material is used.

ten

However, the method of obtaining bimetallic billets has limited technological capabilities, due to the fact that the core must have strength properties much higher than the deformed base of the material of the cladding layer. In this way it is impossible to make a bimetallic pair consisting of a steel cladding layer and a bronze core, which narrows the no2Q menstruation of the manufactured products. In addition, this method of assembly leads to the formation of a thin-wall layer of a deformable workpiece, i.e., the thickness variation of the planned layer, to obtain a press on the shell from the side of introduction

the core, as well as the lintels of the unshielded metal on the opposite side, which determines the need for trimming the ends of the bimetallic billet, i.e., leads to metal losses in the chips, as well as to the exit of the surface metal layers from under the core to the zone of its contact with the shell, which worsens their connection.

The purpose of the invention is to expand the range of bimetallic products and improve their quality by reducing the varnishedness and improving the quality of the compound.

This goal is achieved in that according to the method of producing bimetallic products by making blanks of shell and core materials and then assembling them by deforming the shell material heated to the forging temperature with a cold blank of core material, the shell blank is made flat with a central hole, and assembled during assembly This flat billet with its installation on the billet of core material, after assembly, heat treatment of bimetallic Preparations according to the regime for the sheath material, and then the residue is performed to form the core material tensioned in the compound n pieces obtained product.

FIG. 1 shows the initial blanks of the shell and core and the intermediate bimetallic billet after eversion of the shell; in fig. 2 - stages of the process of precipitation of the core of the bimetallic billet.

The method is implemented as follows.

The initial annular billet of shell 1, for example, of steel 5HNM, stamped on a steam hammer or cut from a sheet with diameter Dj, thickness t and hole diameter do heated to a forging temperature in a protective medium, such as a salt bath, is placed on the die 2 the press. A cold core 3, for example, from BraZh 9-4 bronze, diameter d and height HC, is installed on the initial shell preform. with a radius of rounding of the outer edge Z equal to (0.3-0.4) t. During the working stroke of the press ram, the core 3 twists the initial preform of casing I until the hollow casing 4 is obtained. During the eversion process, the core, with the radius of rounding of the outer edge Z, squeezes an annular recess on the inner surface of the casing 4. The resulting intermediate bimetallic billet is quenched and tempered in accordance with the sheath metal mode.

After heat treatment, the intermediate billet is placed in the matrix 2. The core is deposited by the punch 5 until the core is filled with an annular recess on the shell. The obtained one-piece bimetallic billet with a height of 3 N is removed from the die matrix by the ejector 6.

Quantified intervals

ratios of rounding radius

the edges of the core and the thickness of the workpiece

due to the following data obtained in the process of pilot stamping.

As a result, it is possible to manufacture all-in-one bimetallic products that are similar in shape and size to the finished part.

The proposed method reduces metal consumption by reducing process waste and improves the performance of bimetallic parts by 12%, as a result of improved bonding of parts of a bimetallic pair.

Claims (2)

Invention Formula The method of obtaining bimetallic products by making blanks from 0 of the shell and core materials and their subsequent assembly by deforming the shell material heated to the forging temperature with a cold billet of core material, characterized in that, in order to expand the bimetallic product range and improve their quality by reducing the difference in thickness and improving the quality of the joint, the shell blank is made flat with a central hole, during assembly 0, the flat billet is turned over with its installation on the core material billet, after assembly, the bimetallic billet is heat treated according to the casing material mode, and then the core material is deposited to form a tension in the joint of the parts of the obtained product. Sources of information taken into account in the examination Q 1. USSR author's certificate No. 755404, cl. B 21 C 5/00, 1978. 2. USSR author's certificate No. 304031, cl. B 21 C 23/22, 1970 (prototype).