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Development of a tribological test method for galling resistance of tool steels
2006 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

In sheet metal forming operations like deep drawing, stretching, the tool material is worn out due to the phenomenon of galling: a severe wear type, which effects the surface quality of the final sheet product. Galling occurs due to the adhesion between two contacting bodies when sliding against each other. The galling resistance of various cold worked tool steels produced by Uddeholm Tooling AB were ranked according to different test conditions (dry and lubricated tests), roughness of tool and counter materials etc. In order to investigate the galling resistance of tool steels, a suitable tribological test method (Uddeholm tribo tester) implemented on a conventional lathe machine was used. The counter material in the shape of a cylindrical bar slid against cylindrical tool material perpendicularly. A three-dimensional force-measuring device was used to measure the forces acting on the tool and counter material. The counter materials used for all tests were conventional AISI 304 and Uddeholm grade Stavax ESR. Two types of cold worked tool steels (P/M based and conventional based) were used to rank their galling resistance in different test conditions. It was found from this test method that, increasing load test condition provided proper ranking of all the cold work tool steels investigated while constant load test was not. Scanning electron microscope and optical microscope observations were performed on the tool as well as the counter surfaces to prove the galling resistance of tool steels. It was concluded that, the Uddeholm tribo tester is applicable for ranking cold work tool steels at increasing load test condition both in dry as well as in lubricated sliding conditions. Comparison of various tribological test methods according to various test conditions shows that Uddeholm tester is simple and quick in order to investigate the galling resistance of tool steels. The main advantages of this test method compared with other tribo test method are less sliding distances, easy evaluation of galling initiation and critical load point. The main disadvantage of this test method is inapplicability of constant load test and high sliding speed.

Place, publisher, year, edition, pages
2006. , p. 87
Identifiers
URN: urn:nbn:se:kau:diva-57208Local ID: MTK D-2OAI: oai:DiVA.org:kau-57208DiVA, id: diva2:1121811
Subject / course
Mechanical Engineering
Available from: 2017-07-12 Created: 2017-07-12

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • apa.csl
  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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