Macroscopic gradient hard alloy conical cylindrical tooth and preparation method thereof

A cemented carbide, tapered column technology, used in other manufacturing equipment/tools, engine components, turbines, etc., can solve problems such as insufficient wear resistance, achieve high hardness and wear resistance, increase service life, and improve resistance to wear. The effect of impact ability

Active Publication Date: 2019-11-15
JINAN INSTITUTE OF METALLURGICAL SCIENCE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of macro-gradient cemented carbide tapered column tooth and preparation method thereof, solve the problem of insufficient wea

Method used

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  • Macroscopic gradient hard alloy conical cylindrical tooth and preparation method thereof
  • Macroscopic gradient hard alloy conical cylindrical tooth and preparation method thereof
  • Macroscopic gradient hard alloy conical cylindrical tooth and preparation method thereof

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Embodiment 1

[0031] A macroscopically graded cemented carbide tapered column tooth and a preparation method thereof, comprising the following steps:

[0032] (1) Preparation of mixture:

[0033] Preparation of mixture A: formula WC powder + Co powder, wherein the particle size of WC is 3.0 μm, the mass percentage of Co is 11%, and the mass percentage of carbon is 6.13%. Put it into a wet mill, add molding agent PEG, and the ball-to-material ratio is 3 :1, wet milling time 10h, spray drying granulation.

[0034]Preparation of mixture B: formula WC powder + Co powder, wherein the WC particle size is 2.0 μm, the mass percentage of Co is 11%, and the mass percentage of carbon is 6.18%. Put it into a wet mill, add molding agent PEG, and the ball-to-material ratio is 4 : 1, wet milling time 15h, spray drying granulation.

[0035] (2) Compression molding:

[0036] Mold design: Calculation formula of mold shrinkage factor (K): K=column tooth blank size L1 / column tooth alloy size L2.

[0037] T...

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Abstract

The invention discloses a macroscopic gradient hard alloy conical cylindrical tooth and a preparation method of the macroscopic gradient hard alloy conical cylindrical tooth. The method comprises thefollowing steps that a mixture A and a mixture B with different WC particle sizes, the same Co content and different carbon contents are respectively prepared; a die is designed according to the actual shrinkage coefficient, forward pressing is adopted, the mixture B is added into the die for pre-pressing, then the mixture A is added, and the mixtures are pressed into a mixed pressed blank; duringsintering, partial pressure sintering is carried out at the temperature of 1280-1430 DEG C, 20-60mba of argon gas is introduced, during cooling, slow cooling is carried out from 1430 DEG C to1350 DEGC, rapid cooling is carried out from 1350 DEG to 1250 DEG C, natural cooling is carried out from 1250 DEG C to room temperature, and the macroscopic gradient hard alloy conical cylindrical tooth is obtained after being discharged. The surface layer of the macroscopic gradient hard alloy conical cylindrical tooth has high toughness, the core has high hardness and wear resistance, and the service life of the conical cylindrical tooth is prolonged.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide, and in particular relates to a macroscopically gradient cemented carbide tapered column tooth and a preparation method thereof. Use studs. Background technique [0002] Cemented carbide is composed of refractory metal hard compound and binder metal (mainly Co). The traditional cemented carbide has a uniform structure. This kind of cemented carbide with a uniform structure has a contradiction between wear resistance and toughness. That is, low cobalt content means high hardness and wear resistance and low toughness. On the contrary, cobalt content The higher the toughness, the lower the hardness and wear resistance. Under the condition of the same cobalt content, the particle size of tungsten carbide will have a certain influence on the hardness and toughness, and the finer the particle size of tungsten carbide, the higher the hardness. [0003] Cemented carbide mining columns are wide...

Claims

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Application Information

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IPC IPC(8): C22C29/08B22F3/02B22F1/00B22F3/03B22F3/14B22F5/00
CPCB22F1/0003B22F3/02B22F3/03B22F3/14B22F5/00B22F2005/001C22C29/067C22C29/08
Inventor 孙志远郑君姿李辉邓丽芳崔蒙
Owner JINAN INSTITUTE OF METALLURGICAL SCIENCE CO LTD
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