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

Dewaxing and sintering integrated technique for large product of hard alloy

A technology for cemented carbide and large products, which is applied in the field of preparation of large cemented carbide products by the integrated process of dewaxing and sintering, which can solve the problems of insufficient control precision of the carbon content of the product, and achieve dewaxing efficiency, effective removal, and operation convenient effect

Active Publication Date: 2009-01-14
ZHUZHOU HARD ALLOY GRP CO LTD
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the technical defect of insufficient carbon content control accuracy in the sintering process of large cemented carbide products mixed with paraffin wax molding agent in the above two methods of removing the molding agent, and proposes a method that realizes The new dewaxing and sintering integrated process for removing the forming agent in large cemented carbide products can realize high-precision control of the carbon content in large products and improve product quality and production efficiency

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
  • Dewaxing and sintering integrated technique for large product of hard alloy
  • Dewaxing and sintering integrated technique for large product of hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 is to prepare φ 130mm cemented carbide top hammer, embodiment 2 is to prepare φ 160mm cemented carbide top hammer, and embodiment 3 is to prepare φ 216 (outer diameter), φ 160 (inner diameter), 72 (height) mm cemented carbide roll . The same process steps and process conditions adopted by the three embodiments are as follows, and the different process control parameters adopted by the three embodiments are shown in Table 1.

[0016] Since the dewaxing and sintering integrated process of the present invention adopts a hydrogen positive pressure atmosphere during the dewaxing process, in order to ensure safety, the furnace and the dewaxing pipeline are evacuated in advance, and leak detection is performed by a pressure rise method. After passing the leak detection, first fill the furnace with argon, and then replace the argon in the furnace with hydrogen. The hydrogen used is preferably hydrogen with a dew point ≥ -45°C, and the hydrogen pressure in the furna...

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 discloses a cemented carbide dewaxing and sintering integrated process, which comprises the following steps: firstly, argon is filled in a furnace, then the argon is replaced by hydrogen, and the pressure in the furnace is controlled with 1.01X10<5> to 1.03X10<5> Pa; the multistep heat rising and preservation is performed on the condition that the hydrogen flow is 240 L / min to 260 L / min, and paraffin forming agent is eliminated; the atmosphere in the furnace is adjusted as a negative pressure during the heat preservation period after the temperature is increased to 450 DEG C, and the residual paraffin forming agent in the furnace is eliminated through adopting the hydrogen pulse pressure to scour; after the paraffin forming agent is eliminated, the temperature is increased to 1300 DEG C to 1350 DEG C to perform the vacuum sintering; the argon is filled in the late period of the vacuum sintering, and the argon protection sintering is performed at the temperature of 1350 DEG C to 1450 DEG C; after the argon protection sintering is completed, the argon is rapidly cooled. The process has the advantages that the multistep heat rising and preservation is performed on the condition of a micro-positive pressure hydrogen atmosphere, the dewaxing efficiency is high, the product has no peeling, the product carbon content control precision is very high, and the alloy cobalt magnetism value reaches 6.8 percent to 7.2 percent after the hold up hammer sintering.

Description

technical field [0001] The invention relates to a process method of dewaxing and sintering in hard alloy production, in particular to a method for preparing large hard alloy products through an integrated process of dewaxing and sintering. Background technique [0002] In the compression molding of the production of large cemented carbide products, paraffin wax molding agents must be mixed. However, the molding agent (ie dewaxing) must be removed before the sintering of the cemented carbide products. Usually, two modes are used to complete the removal of the molding agent. The first The first is the batch type, that is to use specific special equipment to complete the removal of the paraffin molding agent at a temperature of 600-800 ° C and a hydrogen protective atmosphere, and then the product is cooled and then transferred to a sintering furnace to complete sintering. The second is the continuous integrated type, that is, the molding agent removal and sintering process of ...

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
IPC IPC(8): C22C1/04B22F3/10
Inventor 蒋洪亮王忆民王力民肖可俊周新华
Owner ZHUZHOU HARD ALLOY GRP CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com