Method for producing molybdenum electrode bar by means of precision forging

A technology of molybdenum electrode and precision forging, which is applied in the field of material preparation, can solve the problems such as the mismatch between molybdenum billet specifications and forging methods, and achieve the effects of regular rod size, no surface cracks, and uniform quality

Active Publication Date: 2013-07-17
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing molybdenum electrode rods by precision forging, which solves the problem that the specifications of molybdenum rod blanks do not match the forging methods in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step, the selection of molybdenum powder

[0023] The selected particle size is 4.5μm, and the loose ratio is 1.25g / cm 3 molybdenum powder as raw material;

[0024] The second step, pressing the billet

[0025] Put the molybdenum powder selected in the first step into a cylindrical mold, and then put the mold loaded with molybdenum powder into a cold isostatic press for pressing, and set the pressure of the cold isostatic press to 180Mpa. The pressure was maintained for another 8 minutes to obtain a molybdenum rod blank with a diameter of 68 mm;

[0026] The third step, sintering molybdenum billet

[0027] The molybdenum rod blank obtained in the second step is put into the intermediate frequency furnace, and the furnace is filled with hydrogen, and then sintered in stages, first heated for 3 hours to increase the furnace temperature from 20 ° C to 1000 ° C, and then kept for 1.5 hours. ; Heating for 1.5 hours to 1250°C, holding for 2.5 hours; Heating for ...

Embodiment 2

[0034] The first step, the selection of molybdenum powder

[0035] Select the particle size as 5.0μm and the loose ratio as 1.5g / cm 3 molybdenum powder as raw material;

[0036] The second step, pressing the billet

[0037] Put the molybdenum powder selected in the first step into a cylindrical mold, and then put the mold loaded with molybdenum powder into a cold isostatic pressing machine for pressing, and set the pressure of the cold isostatic pressing machine to 200Mpa. The pressure was maintained for another 15 minutes to obtain a molybdenum rod blank with a diameter of 90 mm;

[0038] The third step, sintering molybdenum billet

[0039] The molybdenum rod blank obtained in the second step is put into the intermediate frequency furnace, and the furnace is filled with hydrogen, and then sintered in stages, first heated for 4 hours to make the furnace temperature rise from 20 ° C to 1000 ° C, and then kept for 2.5 hours ; Heating for 1.5 hours to 1250°C, holding for 2.5 ...

Embodiment 3

[0046] The first step, the selection of molybdenum powder

[0047] The selected particle size is 4.8μm, and the loose ratio is 1.4g / cm 3 molybdenum powder as raw material;

[0048] The second step, pressing the billet

[0049] Put the molybdenum powder selected in the first step into a cylindrical mold, and then put the mold loaded with molybdenum powder into a cold isostatic pressing machine for pressing, and set the pressure of the cold isostatic pressing machine to 190Mpa. The pressure was maintained for another 10 minutes to obtain a molybdenum rod blank with a diameter of 90 mm;

[0050] The third step, sintering the molybdenum billet

[0051] The molybdenum rod blank obtained in the second step is put into the intermediate frequency furnace, and the furnace is filled with hydrogen, and then sintered in stages, first heated for 4 hours to make the furnace temperature rise from 20 ° C to 1000 ° C, and then kept for 2.5 hours ; Heating for 1.5 hours to 1250°C, holding f...

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Abstract

The invention discloses a method for producing a molybdenum electrode bar by means of precision forging. The method includes the steps of molybdenum powder selection, bar blank pressing, molybdenum bar blank sintering, straightening and forging. The problem that the specifications of the molybdenum bar blanks are unmatched with the forging means in the prior art is solved, and the molybdenum electrode bar produced by the method is uniform in size and quality and free of burrs and surface cracks.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a molybdenum electrode rod by a precision forging method. Background technique [0002] There are two methods for the production of molybdenum electrode rods. The first is to use sintered molybdenum rod blanks as raw materials and use air hammer die forging. However, the air hammer die forging process is backward and inefficient. ) molybdenum electrode rods are powerless; the second is sintered molybdenum rod blanks as raw materials, forged by precision forging machines, and its powerful processing capacity and high efficiency are suitable for mass production of large-scale molybdenum electrode rods. [0003] The particle size and loose ratio of molybdenum powder are important parameters to determine the specifications of molybdenum powder. The physical properties of molybdenum rod blanks produced by molybdenum powder with different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B22F3/16
Inventor 吴兴刚葛宽余惠保卫白秋平杨德武惠军胜苏晓曹维成任宝江仙彬华
Owner JINDUICHENG MOLYBDENUM CO LTD
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