在电火花加工表面硬度的影响研究对AISI P20的塑料模具钢材

A study of surface hardness affecting in electrical discharge machining on AISI P20 plastic mould steel

Janmanee, Pichai

Apiwat 2

1

; Jamkamon, Kamonpong 1

; Kanchanasangtong, Teerayut 1

; Muttamara,

Source: Advanced Materials Research, v 557-559, p 1791-1796, 2012, Advanced Materials and Processes II; ISSN: 10226680; ISBN-13: 9783037854570; DOI:10.4028/www.wendangwang.com; Conference: 2nd International Conference on Chemical Engineering and Advanced Materials, CEAM 2012, July 13, 2012 - July 15, 2012; Publisher: Trans Tech Publications

Author affiliations:

1 Department of Industrial Engineering, Rajamangala University of Technology of Technology Krungthep, Sathorn Bangkok 10120, Thailand

2 Department of Industrial Engineering, Thammasat University, Klongluang Pathumthani 12120, Thailand

Abstract:

This article aims to show the effects of the EDM process that influences the surface hardness by comparing the hardness values before and after the spark on the plastic mould steel AISI P20. Divided by the heat treatment, there were three different hardness levels: 1) the plastic mould steel AISI P20 through the process of quenching with the hardness value in the range of 690-710 HV; 2) the steel through the process of quenching and then annealing with the hardness value in the range of 470-490 HV; and 3) the non-heat treatment steel (raw material) with the hardness value in the range of 300-320 HV. The condition of EDM spark on the surface workpiece was 3 mm of depth and 10 mm of diameter copper electrode. The experiment was carried out under the cover of hydrocarbon, using dielectric cooling, and removing debris by the side flushing through the 6 mm of diameter pipe with the flow rate of 15 liters per minute. The experiment parameters included on-time duty factor variable, off-time duty factor variable, and current. Based on the experiment, it was found that when the duty factor increased, the hardened workpiece showed the less surface hardness value. At the same time, the annealed, and the non-heat treatment workpieces showed that the hardness values were proportional to the duty factor and the current of the EDM process. © (2012) Trans Tech Publications, Switzerland.(10 refs) Main heading:

Hardness

Controlled terms:

Debris - Electric sparks - Experiments - Hydrocarbons - Plastic molds - Quenching Uncontrolled terms:

AISI P20 - Anneal - EDM - MRR - Surface hardness

Classification Code:

901.3 Engineering Research - 817.1 Polymer Products - 803 Chemical Agents and Basic Industrial Chemicals - 951 Materials Science - 701.1 Electricity: Basic Concepts and Phenomena - 452.3 Industrial Wastes - 421 Strength of Building Materials; Mechanical Properties - 537.1 Heat