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Heat treatment process to improve high-speed steel drill


Reduce the thermal stress, thereby reducing the distortion tendency. Isothermal cooling. So that part of the residual austenite into bainite. Not only more effectively reduce the distortion, cracking tendency, but also improve the resilience of the bit. Alignment: the end of quenching. Immediately heat straightening. After cooling the drill bit and other temperature,[link widoczny dla zalogowanych], contain more residual austenite. Hardness is lower. Alignment easier. Temper: To prevent the phenomenon of stabilization of residual austenite occurs. The need for timely temper, and to carry out four times. This is because the drill bit more residual austenite after quenching. Difficult to make a full change in tempering, tempered by 4 times. Significant reduction of residual austenite can obtain the required performance. Tempering at 550 ~ 570 ℃, can get the best combination of performance 【2],[link widoczny dla zalogowanych], so. Selected tempering temperature 560 ℃. Changes in the austenite during cooling in the tempering carried out, so every time tempering. Slow cooling in air to room temperature. To temper the next. Inspection: bit tempered after straightening. Check to meet the technical requirements. Final inspection to confirm the need. Table 1 is a random sample of 10 completed drill test results. Can be seen. Minimum hardness of the bit shank 36HRC, the highest 43HRC; blade hardness minimum 63HRC, the highest 65HRC; bending beat minimum 0.15mm, maximum 0.24mm. Satisfy the technical requirements. Table 1 The results of sampling artifacts 1234567891O shank hardness (HRC) 36384242393943424038 blade bending stiffness ffmc63.563656564.56563.5656464 beat / mmO. 18O. 15O. 22O. 2O0.23O. 180.20O. 240.240.162.2 compared with the conventional process of this technology and conventional open shank and the blade part of the quenching compared with a decrease of another tie wire, preheating, heating, inspection, alignment, and inspection processes, reduce production costs, shorten production cycle, improve efficiency; the same time, avoid dealing with the stems, because of uneven heating caused by the transition zone of varying lengths. Or because the heating temperature is high. A long time of heating the hardness of blades and other issues. Heat treatment to ensure the quality of the bit. 3 Conclusion production proved. Improved heat treatment process is feasible. It not only guarantees the quality of the bit of the quenching. And reduce production costs. Improve efficiency. References: 【1】 Wang Xiao days. 【M】 metal materials. Beijing; Machine Press, 1987.122 * 126. 【2】 Chen Xu arc. 【M】 heat treatment technology. Beijing: Labor and Personnel Press, 1996.319. Tian Subscribe \Public offering in 1979. Electrical production journal from Beijing,[link widoczny dla zalogowanych], industry information. Research Institute, China Heat Treatment Association, China Heat Treatment Association together, \Long-term selected CA, MA, Ei, AJ, quick report and other periodicals on search 0687. MO (international). ISSN: ISSN0254-6051,[link widoczny dla zalogowanych], CN11-1 system. Won the outstanding scientific and technological journals, second prize, continuous 4860/TG. Big 16 opening, 200 pages, coated paper. 2007, each as machinery,[link widoczny dla zalogowanych], metallurgical industrial core journals, the book won the 2001 7.00 yuan, 84 yuan in price (domestic) and $ 90 (abroad). State Journal Square Double Award journals. 2002 by the second session of the National Journal Address: Xue Qing Road, Haidian District, Beijing, 18 \Third in 2004 by the National Journal Award Nomination Award journals. The series of the Department of Post Code: 100083 Tel: 010.62935465,82415083 Magazine theory with practice. Popularization and improvement of both, to promote the line Fax: 62935465 Industry technical progress. Efforts to improve the mechanical and electrical products, service quality and economic efficiency of enterprises, while focusing on international exchanges, informative, quality conscious. Advertising effect. Main sections include the review, research and application of new materials, surface modification, the typical parts heat treatment, process research and improvement, equipment development and transformation, energy saving and environmental protection, E-mail: jsrcl @ vip. sina. tom (manuscript) jsrclgg @ vip. sina. corn (ads) are welcome to subscribe, please Cigao, provide advertising and technical advice welcome! processing technology \
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