Electric shape sense conductor, with a particular workpiece size changes. In the process design, should ensure electrical best magnetic coupling sense conductor and the workpiece, i.e. the optimum gap, in order to achieve the desired uniformity of the heating temperature and the surface hardening of the workpiece. Also note that the electrical different sense conductor inductively coupled to the workpiece, the induction heating efficiency is different, the heating efficiency of the inductive coupling is typically arranged in descending order are: an outer surface of the heating shaft> planar heating> the bore surface of the heating> Internal acute angle heating. In the process of practice, in order to improve the quality and efficiency of process and tooling design, and save costs, a series of modular universal sensor tooling, such as gear hardening sensors ( φ-H ) , should be screened out according to the different equipment and parts. class, wherein [Phi] represents the outer diameter of the gear coupled to the electrical conductor sense of an inner diameter dimension, H represents high phase teeth coupled to an electrical sensing conductor height; hardening shaft sensor ( [Phi]-10 ) class, [Phi] represents the outer diameter of the coupling shaft the electrical conductor sense of inner diameter, 10 denotes a 10mm × 8mm rectangular tube production electrical sensing conductor bore quenching sensor ( Kφ-10 ) class.
For a series of general-purpose sensors, the above process theory is very important in practical work. The spindle head taper short induction hardening, the electrical conductor sectional shape of the greater impact on the feeling of quality of quenching a workpiece.
FIG. 4a , the rectangular tube for electrical sensing conductor water cooled coil. Using the same taper triangular section electrically somatosensory simultaneously quenching mode, inductive coupling gap uniform hardened layer distribution is relatively uniform.
In FIG. 4b , using a non-tapering triangular electrical somatosensory, forming a non-uniform gap an inductive coupling, is not quench-hardened layer is formed in a short tapered mouth portion.
FIG. 4c , a rectangular tube taper electrical somatosensory, inductive coupling gap uniformly, but deep hardened layer formed short taper mouth.
In FIG. 4d , the non-tapered rectangular electric somatosensory, a non-uniform gap an inductive coupling, a short tapered surface hardened layer is formed more uniformly distributed.
FIG. 4 shows different cross-sectional electrically the sense conductor shape, the magnetic coupling gap, the distribution patterns of the spindle head quench hardened layer is formed short taper. However, in actual use, the method shown in Fig. 4c is selected to produce a deeper hardened layer on the end face of the short cone of the workpiece. Because the threaded hole needs to be processed at the plane of the shaft end, if the hole is processed first and then quenched, the end face is thinly tapered when heated The surface is prone to overheating or cracking during quenching; if drilling or tapping the end surface after quenching, it is difficult to process because of the deep hardened layer, and this method is not good in processability. If the method of Fig. 4d is adopted , although the unreasonable situation of the short-cone hardened layer can be improved, there is a danger that the hole to be processed on the spindle flange is hardened or the processed hole is melted during heating and quenching. Thus, induction hardening similar short taper member, using a rectangular tube inappropriate electrical sensing conductor.