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对P6M5、P6M5K5和P9M4K8钢制造的工具在硝盐中采用580℃、1小时多次回火,除了工艺时间过长外还要引起被加热工具表面的锈蚀。本研究的目的就是要利用比较高的回火温度来缩短回火时间,以及采用比硝盐熔点高的对工具表面不易产生腐蚀的其它盐类进行回火加热。在自动化设备上进行回火时工件是被放置在多位夹具上,工件在盐浴中不应影响熔盐在工作表面的自由流动,工件在回火槽中总的加热时间τ_(οσω),如同淬火加热时一样,
Tools for P6M5, P6M5K5 and P9M4K8 steel are tempered in salt nitrate at 580 ° C for several hours and are tempered several times over a one-hour period, causing corrosion of the heated tool surface, in addition to excessive processing time. The purpose of this study is to use a relatively high tempering temperature to shorten the tempering time and to use tempering heating of other salts that have a higher melting point than the nitrate salt and that are less susceptible to corrosion on the tool surface. In the tempering of automation equipment when the workpiece is placed in a number of fixtures, the workpiece in the salt bath should not affect the free flow of molten salt in the work surface, the workpiece in the tempering tank total heating time τ_ (οσω) As when quenching and heating,