Method for preparing molybdenum electrode rod by precise forging method

A molybdenum electrode and precision forging technology is applied in the field of material preparation, which can solve the problem of mismatch between the specification of molybdenum bar billet and the forging method, and achieve the effect of regular bar body size, uniform quality and no surface cracks.

Active Publication Date: 2015-07-29
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 is to press the billet

[0025] Put the molybdenum powder selected in the first step into a cylindrical mold, then put the molybdenum powder loaded mold into a cold isostatic press for pressing, and set the pressure of the cold isostatic press to 180Mpa, after pressing Then hold the pressure for 8 minutes to make a molybdenum billet with a diameter of 68mm;

[0026] The third step, sintering molybdenum billet

[0027] Put the molybdenum billet prepared in the second step into the intermediate frequency furnace, fill the furnace with hydrogen, and then carry out segmental sintering. First, heat for 3 hours to raise the furnace temperature from 20°C to 1000°C, and then keep it for 1.5 hours ;Heat for 1.5 hours to 1250°C, hold for 2.5 hours; heat for 1.5 hours to 1400°C, hold for 2...

Embodiment 2

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

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

[0036] The second step is to press the billet

[0037] Put the molybdenum powder selected in the first step into a cylindrical mold, then put the molybdenum powder loaded mold into a cold isostatic press for pressing, and set the pressure of the cold isostatic press to 200Mpa, after pressing Then hold the pressure for 15 minutes to make a molybdenum billet with a diameter of 90mm;

[0038] The third step, sintering molybdenum billet

[0039] Put the molybdenum billet prepared in the second step into the intermediate frequency furnace, fill the furnace with hydrogen, and then carry out segmental sintering. First, heat for 4 hours to raise the furnace temperature from 20°C to 1000°C, and then keep it for 2.5 hours ;Heat for 1.5 hours to 1250°C, hold for 2.5 hours; heat for 1.5 hours to 1400°C, hold for 3.5 hour...

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 is to press the billet

[0049] Put the molybdenum powder selected in the first step into a cylindrical mold, then put the molybdenum powder loaded mold into a cold isostatic press for pressing, and set the pressure of the cold isostatic press to 190Mpa, after pressing Then hold the pressure for 10 minutes to make a molybdenum billet with a diameter of 90mm;

[0050] The third step, sintering molybdenum billet

[0051] Put the molybdenum billet prepared in the second step into the intermediate frequency furnace, fill the furnace with hydrogen, and then carry out segmental sintering. First, heat for 4 hours to raise the furnace temperature from 20°C to 1000°C, and then keep it for 2.5 hours ;Heat for 1.5 hours to 1250°C, hold for 2.5 hours; heat for 1.5 hours to 1400°C, hold for 3...

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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 ways to make molybdenum electrode rods. The first one is to use sintered molybdenum billet as raw material and adopt air hammer die forging method. )’s molybdenum electrode rods are powerless; the second type uses sintered molybdenum rod blanks as raw materials and is forged by a precision forging machine. 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. Molybdenum rods produced by molybdenum powders with different particle sizes and loose ratios have different physical properties, that is, molybdenum rods produced...

Claims

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Application Information

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Patent Type & Authority Patents(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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