Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of complex-shaped large cemented carbide wear-resistant block

A technology of cemented carbide and complex shapes, applied in the field of powder metallurgy cemented carbide, which can solve the problems of inconsistent compact density, difficult manufacturing, and large material waste, and achieve uniform density distribution, uniform density, and wear resistance high effect

Active Publication Date: 2020-02-21
ZHUZHOU HARD ALLOY GRP CO LTD
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very difficult to manufacture such a large carbide wear block with complex shape
It is impossible to make such a complex shape by using the traditional molding method of cemented carbide, and the density of different parts of the compact is seriously inconsistent, and deformation and cracks appear after sintering; the cold isostatic pressing method is adopted, and then the compact is machined. The material waste is large, and the material removed by the green compact machining is as high as 60%. The green compact machining will produce microscopic cracks and residual stress on the processed surface. After sintering, cracks will occur at the grooves or corners

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of complex-shaped large cemented carbide wear-resistant block
  • Preparation method of complex-shaped large cemented carbide wear-resistant block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put the cemented carbide mixture (including molding agent) with a cobalt content of 8wt% into a steel mold, use a 500-ton hydraulic press, hold the pressure for 300 seconds under a pressing pressure of 75MPa, and press-form a 280mm×260mm×148mm pre- After wrapping the preform with latex film, hold the pressure in a cold isostatic press for 8 minutes under a pressure of 180MPa, perform the first cold isostatic pressing, take out the compact after pressure relief, and cut it out with a diamond wire saw figure 1 platform 4 in , CNC milled out figure 1 Chamfer 1, assembly groove 2 and excessive stress relief arc 3, and then grind to correct the size, and then carry out the second cold isostatic pressing with the latex film bag, and the final pressure of the second cold isostatic pressing is 120MPa , after unloading, pressure sintering is carried out, the sintering pressure is 6MPa, and the final sintering temperature is 1410°C, and then a large-scale hard alloy wear-resistan...

Embodiment 2

[0039] Put the cemented carbide mixture (including molding agent) with a cobalt content of 10wt% into a steel mold, use a 315-ton hydraulic press, hold the pressure at 55MPa for 400 seconds, and press to form a 280mm×260mm×148mm preform , after wrapping the preform with a latex film, hold the pressure in a cold isostatic press for 10 minutes under a pressure of 185MPa, perform the first cold isostatic pressing, take out the compact after the pressure is released, and cut it out with a diamond wire saw figure 1 platform 4 in , CNC milled out figure 1 The chamfer 1, the assembly groove 2 and the excessive stress relief arc 3 are ground, and then the size is corrected by grinding, and then the second cold isostatic pressing is carried out with the latex film bag, and the final pressure of the second cold isostatic pressing is 110MPa. After unloading, pressure sintering is carried out, the sintering pressure is 6MPa, and the final sintering temperature is 1450°C, and then a large ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method of a complex-shaped large cemented carbide wear-resistant block. The method comprises the following steps of S1, carrying out powder pressing on a cemented carbide mixture, and pressing to form a square pre-blank; S2, carrying out first cold isostatic pressing on the square pre-blank to obtain a pressing blank; S3, carrying out mechanical machining onthe pressing blank to obtain the machined pressing blank; S4, carrying out second cold isostatic pressing on the machined pressing blank to obtain the treated pressing blank; and S5, carrying out pressure sintering on the treated pressing blank to obtain the complex-shaped large cemented carbide wear-resistant block. According to the method, the complex-shape large cemented carbide product can bestably and reliably manufactured, the prepared complex-shape large cemented carbide wear-resistant block is complex in shape, high in dimensional accuracy and uniform in density, stress concentrationinside the material is remarkably reduced, the impact resistance is good, and wear resistance is high.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy cemented carbide, and in particular relates to a preparation method of a complex-shaped large cemented carbide wear-resistant block. Background technique [0002] Cemented carbide has high hardness and is widely used in wear-resistant fields. Large carbide wear-resistant blocks with complex shapes are used as key components of large-scale ore crushing equipment, requiring good assembly accuracy, impact resistance, high wear resistance, and high reliability. It is very difficult to manufacture such a large carbide wear-resistant block with complex shape. It is impossible to make such a complex shape by using the traditional molding method of cemented carbide, and the density of different parts of the compact is seriously inconsistent, and deformation and cracks appear after sintering; the cold isostatic pressing method is adopted, and then the compact is machined. The waste of material ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/04B22F3/24C22C29/08
CPCB22F3/04B22F3/24B22F2003/247B22F2998/10C22C29/067C22C29/08
Inventor 刘艾平夏艳萍朱立荣赵声志赵珊珊夏超良蔡增
Owner ZHUZHOU HARD ALLOY GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products