Title:
POROUS VALVE GUIDE AND PROCESSING PROCESS THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/026750
Kind Code:
A1
Abstract:
Disclosed are a porous valve guide and a processing process thereof. The processing process comprises the following steps: mixing an iron powder and a carbon powder according to a set iron-carbon mass ratio to obtain a mixed powder A, and taking part of the mixed powder A and mixing with ammonium bicarbonate to obtain a mixed powder B; press molding the mixed powder A and the mixed powder B, respectively by using a press molding method to obtain a tubular green body A and a tubular green body B, wherein the green body B can be in clearance fit with an inner hole of the green body A; and fitting the green body B and the green body A correspondingly in an insertion manner to obtain a guide green body, and sintering the guide green body under the atmosphere of a protective gas to obtain a porous valve guide, with a porous inner wall layer (11) and a compact outer wall layer (12), that has a modified surface.
Inventors:
ZHOU LONG (CN)
BAI LING (CN)
ZHANG TIANLIANG (CN)
SUN SHANLIANG (CN)
BAI LING (CN)
ZHANG TIANLIANG (CN)
SUN SHANLIANG (CN)
Application Number:
PCT/CN2019/100327
Publication Date:
February 18, 2021
Filing Date:
August 13, 2019
Export Citation:
Assignee:
WEICHAI POWER CO LTD (CN)
International Classes:
F01L3/08; B22F3/12; B22F3/16; B22F5/00; B22F5/12
Foreign References:
| JP2007002808A | 2007-01-11 | |||
| CN101507352A | 2009-08-12 | |||
| CN2625586Y | 2004-07-14 | |||
| CN108825324A | 2018-11-16 | |||
| US1766865A | 1930-06-24 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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