The Engine Valve Umbrella Head Hot Forging Die Improvement Measures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.740.694 ◽

2013 ◽

Vol 740 ◽

pp. 694-697

Author(s):

Hai Ning Yu

Keyword(s):

Fatigue Crack ◽

Hot Forging ◽

Structure Design ◽

Mold Material ◽

Short Life ◽

Hot Forging Die ◽

Production Practice ◽

Improvement Measures ◽

Forging Die ◽

Fatigue Crack Generation

When using monolithic hot die to forge the umbrella head of valve parts, hot die of a short life. Through the analysis of factors caused by mold, the structure design, mold material, mold manufacturing and use to take certain measures, the production practice showed that die fatigue crack generation and extended time to prolong service life, obviously improved.

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Structure Design and Research of Heat Pipe Cooled Hot Forging Die

Materials Science Forum ◽

10.4028/www.scientific.net/msf.770.414 ◽

2013 ◽

Vol 770 ◽

pp. 414-418

Author(s):

Wei Cheng ◽

Ping Liang

Keyword(s):

Temperature Field ◽

Heat Pipe ◽

Thermal Load ◽

Hot Forging ◽

Structure Design ◽

Computational Method ◽

Structure Model ◽

Hot Forging Die ◽

Die Structure ◽

Forging Die

This paper describes the structure of heat pipe cooled hot forging die. A computational method was used to predict the temperature field of the die structure model. The research results show that the heat pipe can be effective cooled hot forging die, the temperature values of around heat pipe have a declining greater, thus significantly reducing the thermal load of the hot forging die, to further extend the life of the die.

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Filling Path Planning and Polygon Operations for Wire Arc Additive Manufacturing Process

Mathematical Problems in Engineering ◽

10.1155/2021/6683319 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Jiansheng Zhang ◽

Qiuyun Wang ◽

Guiqian Xiao ◽

Jie Zhou

Keyword(s):

High Temperature ◽

Additive Manufacturing ◽

Path Planning ◽

Attitude Control ◽

Hot Forging ◽

Outer Contour ◽

Hot Forging Die ◽

Forging Die ◽

Wire Arc Additive Manufacturing ◽

Filling Path

To improve the service life of hot forging die, the additive manufacturing algorithm and additive manufacturing device for die remanufacturing are developed. Firstly, a compound filling algorithm in which the inner zone is filled by linear scanning and the outer contour is filled by offsetting is developed in order to solve the problems encountered in filling path planning for wire arc additive manufacturing (WAAM) like staircase effect at marginal division, degenerated edge at outer contour, programming difficulty, and so forth. Meanwhile, the attitude control algorithm of welding gun is proposed to control the angle between welding gun and welding path so as to improve the welding forming quality. Secondly, the high-temperature and low-temperature wear resistances of Fe-based and Ni-based alloy are tested. The results show that Ni-based alloy has higher high-temperature wear resistance. Finally, a disabled crankshaft hot forging die is selected for application test and the results show that, using the techniques discussed in this paper, welding materials can be saved by more than 50% and machining cost can be saved by more than 60%. In addition, the surface of automatic-repaired die is smooth without oxidation, collapse, and other defects after forging 3000 times, which is much better than that of manual-repaired die.

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