Analysis of the stress state analysis showed a high frequency machine stress state, the pressure on the edge of the mold blank value σs ln (r + h) / r. Reached when r / h values ??α1 and yield stress value σs phase and on values. Thus, the blank in the curved section of the tensile resistance is significantly weaker. In contrast effects are caused by hardening due to the bending of these segments, its more hardened flat segment generated quickly. According to r / h value, is one of the dominant factors. Before carrying capacity of the blank segment determines the punch and the die should be a minimum allowable radius Rmin starting from the following conditions, i.e. not in contact with the mold segments into the plastic blank in a stretched state to be subjected to contact pressure disappears. The resulting value Rmin more general bent nearly 50% larger for low carbon Qingdao frequency induction equipment, Rmin value does not exceed the value of the material thickness. Inclined wall of the specimen during testing limit angle of nearly 45 ° Shandong frequency induction equipment, the results of this can be confirmed by a test pressing profiles. According to the frequency of the alternating current level of induction heating heat treatment can be divided into UHF, HF, super audio, frequency, frequency 5 classes. ① ultra-high frequency induction heating heat treatment used in the current frequency up to 27 MHz, the heating layer is extremely thin, only about 0.15 mm, can be used for surface hardening thin circular saws and other complex shape of the workpiece. ② a high-frequency induction heating frequency of the current used in the heat treatment is typically 200 to 300 kHz, the heating layer depth of 0.5 to 2 mm, the gear may be used for surface hardening, the cylinder sleeve, cam, shaft, and other parts. ③ super audio induction heating current frequency used for the heat treatment is generally 20 to 30 kHz frequency induction device uses small modulus gear with ultra-audio frequency induction heating current, the heating layer generally distributed along the tooth profile, pure fire after use better performance . ④ heat induction heating current frequency used is generally 2.5 to 10 kHz, a heating layer depth of 2 to 8 mm, and more for big modulus gear, surface hardening large diameter shafts and other parts of cold roll. ⑤ frequency induction heating heat treatment used in the current frequency of 50 to 60 Hz, a heating layer depth of 10 to 15 mm, can be used for surface hardening of large workpieces. UHF sensing devices | Qingdao Tianrun high frequency | high frequency induction equipment provided by the Run High Frequency Electric Co., Ltd. Qingdao days. High Frequency Electric Co., Ltd. Qingdao Tianrun (www.gaozhoubo.com.cn) in the field of packaging related equipment devoted boundless enthusiasm and passion, Qingdao Tianrun high frequency has been customer-centric, for customers to create the concept of value, quality and service to win the market, and sincerely hope to cooperate with the community to create a successful, create brilliant. Related businesses welcomed the inquiry, contact: Yan Lidong.