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用高频感应加热设备对工件内表面进行淬火,一般来说是比较困难的,存在着加热慢、功率损耗大,工件淬火后易变形,硬度不足等问题。尤其是对长度较大,需进行连续内表面淬火的工件来说,质量更难以保证。我厂生产的地勘配件缸套,内径80毫米,长度140毫米,材料内孔面要求淬火 HRC45～52。原来是用截面积为12×6毫米的长方形紫铜管做成单圈自喷冷却连续淬火的感应圈,内面嵌上一圈特制的导磁体,使磁力线能集中于缸套内表面,加快加热速度,减少变形,以达到表面淬火的目的。
It is generally difficult to quench the inner surface of the workpiece with high frequency induction heating equipment. There are problems such as slow heating, large power loss, easy deformation of the workpiece after quenching, and insufficient hardness. Especially for the larger, the need for continuous internal surface hardening of the workpiece, the quality is more difficult to guarantee. I plant the production of geological parts cylinder liner, diameter 80 mm, length 140 mm, the material required hole quenching HRC45 ~ 52. The original is the use of rectangular cross-sectional area of 12 × 6 mm rectangular tube made of single-ring self-jet cooling continuous quenching induction coil, the inner surface embedded in a circle of special magnet, the magnetic field lines can focus on the inner surface of the cylinder to speed up the heating Speed, reduce deformation, in order to achieve the purpose of surface hardening.