CN103602937B - A kind of method prepared by high performance high-density tungsten alloy material - Google Patents

Abstract

The invention discloses a new method for preparing a high-performance high-density tungsten alloy material. The channel of the concave mold cavity of the mold is designed by a pipeline with the same cross-sectional area at a continuous 90° angle, that is, the channel of the mold cavity It is formed by the intersection of the equal channel angle extrusion process path Ba, and the one extrusion process realizes three times of equal channel angle extrusion shear deformation. Improving the performance of high-density tungsten alloy can not only obtain high-performance high-density tungsten alloy with fibrous structure, but also improve its mechanical properties, increase strength and hardness, increase material utilization, and save time. Continuous equal channel angle extrusion improves the working efficiency of extrusion, reduces the labor intensity of operators, widens the deformation of equal channel angle extrusion, and improves the comprehensive performance of high-density tungsten alloy.

Description

A kind of method for preparing high-performance high-density tungsten alloy material

technical field

The invention relates to a method for preparing high-density tungsten alloy, in particular to a new method for preparing high-performance high-density tungsten alloy material

Background technique

High-density tungsten alloy is based on tungsten (the mass fraction of tungsten is usually 80%-97%), and is sintered with a small amount of nickel, iron, copper and other alloying elements by powder metallurgy liquid phase method. High-density tungsten alloy not only has a high density Large, and high strength, high hardness, good ductility, good weldability. These properties make it widely used in military and industry, such as armor-piercing projectiles, inertial components and balance weight components. With the strengthening of the military industry, higher requirements are placed on the performance of high-density tungsten alloys. High-performance high-density tungsten alloy with fibrous structure can be obtained by severe plastic deformation and forging processing of high-density tungsten alloy, combined with heat treatment process.

Severe plastic deformation is an effective method for preparing ultrafine-grained materials. This method can prepare bulky and dense materials, change the size and arrangement direction of grains, and has simple process, low cost and high material utilization rate. The traditional equal-channel bending process is a more effective method of severe plastic deformation for grain refinement. It can achieve material grain refinement through multi-pass extrusion, but manual operations are required between different passes, which wastes time. The work efficiency is reduced. If it is designed as a continuous channel, one extrusion can achieve multiple times the effect of the traditional process. This not only improves the work efficiency, improves the material performance, but also reduces the material production cost.

Contents of the invention

The purpose of the present invention is: for the above-mentioned technical problem of existence, provide a kind of new method that can obtain high-performance high-density tungsten alloy, this method just can realize the effect of traditional technology 3 times through one process, this method not only can Obtain high-performance high-density tungsten alloy with fibrous structure, improve its mechanical properties, increase strength and hardness, and improve the working efficiency of extrusion, saving materials and time.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: the die cavity of the die is formed by connecting pipes with the same cross-sectional area at 90° according to the equal channel angle extrusion process path Ba, and one process realizes three times of shearing. deformation, the specific implementation steps are

1. Cut the material into samples with a diameter of 10mm and a length of 40mm by wire cutting technology, and fully anneal the samples;

2. Before putting the extruded part into the cavity, the mold should be fully lubricated. After the extruded part is put in, the mold and the extruded part should be preheated to a certain temperature at the same time. After the extrusion is completed, the extruded part should be Stress relief annealing;

3. Due to the limited length of the punch, when the extruded piece has completely entered the channel, put in another extruded piece to advance the movement of the previous extruded piece until the extrusion of the extruded piece is completed;

4. After the extrusion is completed, perform stress relief annealing on the extrusion.

The beneficial effects of the invention are: through continuous extrusion of high-density tungsten alloys, coarse grains can be refined to obtain high-performance materials with fibrous structures, and the strength, hardness and ductility of high-density tungsten alloys are improved. Continuous equal-channel extrusion deformation can improve the working efficiency of extrusion, reduce the labor intensity of operators, widen the extrusion deformation of equal-channel corners, improve the utilization rate of materials, and improve the comprehensive performance of high-density tungsten alloys.

Description of drawings

Fig. 1 is the mold assembly drawing of the new method that a kind of high-performance high-density tungsten alloy material is prepared;

Fig. 2 is a sectional view of the die;

Figure 3 shows the structure of the double-layer prestressed composite die.

The labels in the above figure are:

Fig. 1 The mold assembly diagram of a new method for the preparation of high-performance high-density tungsten alloy materials 1. Lower template 2. Guide post 3. Hexagon socket screw 4. Guide sleeve 5. Upper template 6. Punch fixed plate 7. Positioning cylindrical pin 8. Punch 9. Punch backing plate 10. Hexagon socket head cap screw 11. Die plate 12. Second layer of die press sleeve 13. First layer of die press sleeve 14. Die 15. Die pad.

Detailed ways

As can be seen from the die assembly drawing of the present invention shown in Fig. 1, the die sectional view of Fig. 2, the design detail skills of the extrusion channel in the prestressed combined die structure of Fig. 3, the present invention mainly contains 1. lower template 2. guide Column 3. Inner hexagon screw 4. Guide sleeve 5. Upper template 6. Punch fixing plate 7. Positioning cylindrical pin 8. Punch 9. Punch backing plate 10. Inner hexagon screw 11. Die plate 12. Second layer Die press sleeve 13. The first layer of die press sleeve 14. Die 15. Die pad and other components. In the extrusion process, the materials used in the extrusion experiment are first cut by wire cutting, and then processed into a sample with a diameter of 10mm and a length of 40mm by cutting method. Before extrusion, it is annealed and then put into a continuous equal channel bend. For the extrusion die, due to the limited length of the punch, when the extruded part enters the channel completely, another extruded part is put in to advance the movement of the previous extruded part until the extrusion of the extruded part is completed. The die design of the present invention is different from that of conventional equal-channel angle extrusion dies. After the extruded part completes one extrusion stroke, it is equivalent to three times of shear deformation of the extruded part. After one extrusion is completed, the The sample is repeatedly extruded until the performance of the sample meets the test requirements. Due to the adoption of the prestressed combined die structure, the life of the die is improved, and the success rate of the experiment and the extrusion efficiency are improved. After the extrusion is completed, stress relief annealing is performed on the extrusion.

The die continuous channel structure adopted in the present invention can adopt the prior art, and the present invention is not limited to the specific implementation forms listed above, and all improvements that can be obtained by those skilled in the art without creative work all belong to this invention. within the scope of protection of the invention.

The required equipment of the present invention is a mechanical press or a hydraulic press.

Claims (3)

1. the method prepared of high performance high-density tungsten alloy material, implementation step is as follows:

A () utilizes line cutting technology material to be cut into diameter for 10mm, length is the sample of 40mm, and carries out Full Annealing to sample;

B () first lubricates mould before extrusion is put into die cavity fully, after putting into extrusion, mould and extrusion are preheating to certain temperature simultaneously, after having extruded, carries out stress relief annealing to extrusion;

C (), due to punch limited length, when after the complete admission passage of extrusion, at this moment advances the motion of a front extrusion, until extrusion has extruded by putting into another extrusion;

D () carries out stress relief annealing to extrusion after having extruded.

2. the mould that a kind of method prepared of high performance high-density tungsten alloy material is used according to claim 1, mould structure comprises as lower component: lower bolster, guide pillar, socket head cap screw, guide pin bushing, top plate, punch retainer, setting circle pin, convex mould pad, socket head cap screw, punch, die pressing plate, second layer die gland, the first layer die gland, die, cushion block and die backing plate, is characterized in that:

A () this mould adopts two_layer pre_stress combined matrix structure, adopt the prestressed structure of shrink-fit to increase substantially mould strength;

B () arranges heating unit in the outside of die, to carry out preheating to mould and extrusion;

C () completes a crush stroke after, extrusion experienced by 3 shearing strain.

3. the mould that a kind of method prepared of high performance high-density tungsten alloy material is used according to claim 2, is characterized in that: the cavity structure of female die of die by the identical pipeline of cross-sectional area with 90 °, to connect by equal channel angular pressing path Ba and form.