Hard alloy holding-up hammer dewaxing sintering method

A technology of cemented carbide anvil and sintering method, which is applied in other manufacturing equipment/tools, turbines, engine components, etc., and can solve problems such as easy cracking

Pending Publication Date: 2022-03-15
ZHEJIANG HENGCHENG CEMENTED CARBIDE
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hard alloy anvil dewaxing sintering method, which can effectively solve the problem that large hard alloy products are easy to crack after dewaxing and sintering

Method used

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Embodiment Construction

[0032] Embodiments of the present invention will be described in detail below, intended to be used to illustrate the invention.

[0033] A hard alloy topmer dewaxing sintering method, including the following steps:

[0034] S10: Hydrogen removal wax, including steps S11 to S14, and hold 15 Mbar in the furnace when the temperature is warmed, and remains continuously charged with hydrogen, and the hydrogen flow is 80 l / min;

[0035] S11: Close the furnace door utilizes the air in the hydrogen replacement furnace, after the pressure reaches 15 MBar, starting from room temperature to 250 degrees Celsius, temperature rise rate of 1.25 ° C / min;

[0036] S12: 60 minutes in 250 degrees Celsius;

[0037] S13: A constant speed of 250 degrees Celsius refers to 350 degrees Celsius, temperature rise rate of 0.25 ° C / min;

[0038] S14: Uniformly ramping from 350 degrees Celsius, 450 degrees Celsius, temperature rise rate of 0.3 ° C / min;

[0039] S20: A negative pressure dewaxing, includ...

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PUM

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Abstract

The invention discloses a hard alloy holding-up hammer dewaxing and sintering method which sequentially comprises the following steps: carrying out hydrogen dewaxing before 450 DEG C, filling argon between 450 DEG C and 600 DEG C to carry out negative-pressure dewaxing, then heating from 600 DEG C to 1250 DEG C to carry out vacuum sintering, filling argon to carry out pressure sintering from 1250 DEG C to 1415 DEG C, and carrying out vacuum sintering after the temperature is raised from 600 DEG C to 1250 DEG C; and finally preserving heat for 60 minutes, and then cooling to room temperature. The method has the advantages that the dewaxing mode that positive-pressure hydrogen dewaxing and negative-pressure argon dewaxing are matched is adopted, the dewaxing time is shortened to be within 2 days from original 5 days, argon is added into the sintering furnace in the sintering process, it is guaranteed that no gap defect exists in a product, and the product strength is improved.

Description

Technical field [0001] The present invention relates to a carbide a hammer dewaxing sintering method. Background technique [0002] The top hammer product belongs to the carbide product, and the removal of the molded paraffin is a difficult point during the sintering process. The traditional top hammer product molding agent is removed in a dedicated segon, with hydrogen as a protective gas, and slowly warming up the molded agent removal purpose. Due to the large size of the top hammer, the process of removing the molding agent often requires 6-7 days, and the production efficiency is very slow. The releasing molding agent requires twice to transfer to the sintering furnace for sintering, due to the protection of tungsten tungsten tungsten tungsten tungsten tungsten tungsten tungsten tungsten tungsten carbide and cobalt due to the removal of the completion form, which is very susceptible to the effect of oxygen in the air, resulting in oxidation The oxygen content of the top hamme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F5/00
CPCB22F3/1025B22F3/101B22F5/00
Inventor 孙志远金益民金佳男吕晟吴丽萍杜跃华
Owner ZHEJIANG HENGCHENG CEMENTED CARBIDE
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