Tool for textiles and production method for same
AssigneeGroz-Beckert KG
InventorsSimone Schwarz, Frank-Martin Durst, Richard Zeller
Life of this patent
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Abstract
The tool (10) for textiles according to the invention consists of chromium steel, into which carbon has been embedded in locally varying amounts during a carbonizing process. Thermal treatment achieves a formation of martensite with the maximum achievable hardness, in particular in those zones in which larger carbon fractions have been introduced. A tool for textiles with zones of differing hardnesses can thus be produced without having to subject the individual zones with differing hardnesses to different process conditions during the production process. The hardness is controlled on the basis of the degree of deformation of the tool for textiles.
Claims17
A tool (10) having a size within a range of thickness of needles for textiles, the tool comprising:
- a base body including a chromium steel and portions (14, 15) whose material displays differing degrees of deformation,
- said base body having a chromium content of 11% to 30%, an aluminum content of less than 0.3 percent by weight, a copper content of less than 0.4 percent by weight, and a total carbon content of more than 0.8% in at least one surface zone;
- wherein the base body consists essentially of a carburized chromium steel;
- wherein the base body has an initial carbon content of not more than 0.7%;
- wherein less than 20% of individual carbide crystals at a surface of the tool are connected by fusible links.
A method for providing tools (10) having a size within a range of thickness of needles for textiles, the method comprising:
- deforming various portions of a tool blank of a chromium steel with a base body having a chromium content of at least 11%, an aluminum content of below 0.3 percent by weight, a copper content of below 0.4 percent by weight, and a total carbon content of more than 0.8% in at least one surface zone, wherein the base body consists essentially of a carburized chromium steel, wherein the base body has an initial carbon content of not more than 0.7%, and wherein less than 20% of individual carbide crystals at a surface of the tool are connected by fusible links, with differing degrees of deformation for production of at least one working portion (14) and one shank portion (15),
- carburizing the tool blank under chromium carbide formation,
- applying a hardening temperature to the carburized tool blank,
- quenching the tool blank for formation of martensite.
Dependencies are inferred from the claim text.