SU791778A1 - Method of making bimetallic tool - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used in tool-die production in the manufacture of dies, molds and molds.

A known method of obtaining molding tools, including annealing the workpiece, reheating the workpiece to a temperature of 10-30 C below point A, holding for 1-3 hours, cooling to 200-350 s, isothermal extrusion of the working figure, quenching and tempering flj. In the manufacture of tools in a known isothermal extrusion method, the effect of structural superplasticity is manifested, which helps to reduce the extrusion force.

A known method of making molding tools includes annealing a bimetallic forging with a stamped working figure, heating the forging to the austenization temperature of the cladding layer, pressing to the relative stability of austenite of this layer, holding to austenite of the forging base, pressing the working figure, hardening and tempering

2J vacation As a result, the hardness of the substrate with respect to the hardness of the cladding layer increases, which contributes to the quality of reproduction of the extruded figure and reduces the distortion of the forging during subsequent quenching. ,

Upon receipt of tools with a plating layer made of steel of a carbide class, the force for extruding the figure is very high, which is associated with the need to use powerful presses and massive tooling. This disadvantage is due to the fact that the hardness of supercooled austenite steels of this class, in anti-difficulty, became m non-carbide class at extrusion temperatures of ZZO-BBO C significantly higher than the hardness of 20 perlite of the same steel.

The purpose of the invention is to reduce the force of extrusion.

The goal is achieved by the fact that in the known method of manufacturing 25 bimetallic tools, mainly with a cladding layer of carbide class material, including stamping, annealing, heating for quenching, holding, pushing up to 30 temperatures, relatively stable Ti austenite of a cladding slr, holding, extruding the working figure, quenching and tempering, heating for quenching is carried out to a temperature of 10 ° C below point A of the cladding layer, and after squeezing the working figure, the heating to temperature is made. and a cladding layer and a delayed cooling, at a relative stability of the austenite.

A comparison of the experts with 1Mental curves showed that the hardness of the cladding layer after processing the samples for extrusion using the proposed method is lower than the hardness at the same test temperatures of the samples subjected to the prototype processing. So, for example, at 300 and 500 ° C, the hardness ratio is 0.44, respectively. and 0.72, which indicates the advantage of the Proposed method over the prototype in part to reduce the extrusion of the working figures. The relative hardness of the cladding layer at comparative temperatures (350 and is after processing under extrusion in accordance with the proposed method of 0.80 and 0.73, and in the processing of the prototype - 1.95 and 1.09.

Example. It was made of 40X steel (base) and RBMB (cladding layer) of a batch of master dies to obtain mold punch plug plugs. For this, bimetallic forgings with pre-stamped working figures were nickel-plated to prevent scaling and were fully annealed under a layer of graphite. Then the forgings were again heated to a temperature of 10-30 ° C below point A of the cladding layer 820c) and kept at the same temperature in a furnace for 2 hours. As a result, the initial perlite of the forging base was turned into austenite, and the cladding layer did not undergo phase transformation, but became soft and plastic. Then the forgings were cooled to 280-ZOO C, kept at this temperature in the furnace to convert austenite of the main 40X steel to bainite, and then isothermally extruded the working figures using a hydraulic punch.

After extrusion of the working figures, the forgings were reheated to the quenching temperature of the cladding layer (1240-126 ° C and then cooled and kept in an oven having a temperature corresponding to the extrusion temperature (280 ° C) for 20 minutes. Following this, the forgings were hardened, tempted cladding steel mode and carried out dimensional-finishing treatment of the landing

 Places and polishing of working figures ..

Testing the proposed method showed that it provides, in contrast to the prototype, the possibility of plastic forming

5 spatially complex working figures of instruments clad with carbide grade materials at warm deformation temperatures, which simplifies the technology and expands them

Q area of use of wear-resistant cladding materials, which increases the service life of the molding tools by 2-3 times.

Frmula browsing

A method of manufacturing a bimetallic tool, preferably with a cladding layer of carbide steel

class, including stamping, annealing, heating for quenching, aging, cooling up to a temperature of relative stability of the austenite of the cladding layer, exposure, extrusion of the working

figures, quenching and tempering, which is carried out by the fact that, in order to reduce the force of extrusion, the quench heating is first carried out to a temperature of 10-30 ° C below point A

the cladding layer, and after pressing the working figure, to the quenching temperature of the cladding layer, and quenching is carried out with an exposure at a temperature of relative stability of austenite.

Information sources,

taken into account in the examination

1. Author's certificate of the USSR 673660, cl. C 21 D 7/14, 1978.

2. Improving the quality and efficiency of manufacturing technology.

tooling method of plastic deformation. Sat Tallinn, 1977, p. 116119.

Claims (2)

Claim A method for the preparation of a bimetallic tool, mainly with a cladding layer of class 30 carbide steel, including stamping, annealing, quenching, soaking ^ stirring to temperature of the relative stability of the austenite of the clad layer, soaking, extruding the working figure 35, hardening and tempering, which, in order to reduce the extrusion force, the hardening is first carried out to a temperature of 10-30 ° C below point A _{in the} 40 cladding layer, and after extruding the working figure, to the hardening temperature cladding layer and conduct hardening with exposure at a temperature of relative stability of austenite. 45 Sources of information taken into account in the examination 1. USSR copyright certificate No. 673660, cl. C 21 D 7/14, 1978. 2. Improving the quality and efficiency of manufacturing tooling by plastic deformation. Sat Tallinn, 1977, p. 116.119.