A device and process for thermal processing of camshafts with small batches and multiple specifications

Abstract

The invention discloses a device and a process for hot working of small-batch multi-specification camshafts, and belongs to the field of camshaft heat treatment. The device comprises a steel frame anda workbench, wherein two lifting devices are symmetrically arranged on the steel frames located on the two sides of the workbench, a rotary platform device is arranged on the workbench, the camshaftis movably connected in the rotary platform device, a cam is arranged on the camshaft, the lifting devices are correspondingly connected with telescopic rods, the tail end of one telescopic rod is connected with a peach tip induction coil, the tail end of the other telescopic rod is connected with a base circle induction coil, an isolation plate is arranged between the peach tip induction coil andthe base circle induction coil, and the workbench is provided with a PLC which is electrically connected with the lifting devices and the rotary platform device correspondingly. According to the device for hot working of the small-batch multi-specification camshafts and the process adopting the device, the quenching temperature and the depth of the hardened layer after quenching of the peach tippart of the cam are correspondingly same as the quenching temperature and the depth of the hardened layer after quenching of the base circle part of the cam, and the cams with different specificationscan be continuously heated.

Description

technical field [0001] The invention relates to the technical field of camshaft heat treatment, in particular to a device and process for thermal processing of camshafts with small batches and multiple specifications. Background technique [0002] The camshaft is one of the key parts of the engine. Its function is to control the opening and closing of the valve, to ensure that the engine regularly sucks fresh combustible mixture into the cylinder during operation, and discharges the burned exhaust gas out of the cylinder in time. When the engine is working, the working surface of the cam not only bears higher alternating stress than the core, but also bears friction, which affects the service life of the camshaft. In order to improve the service life of the camshaft, the working surface of the cam must have high strength, hardness and wear resistance within a limited depth range, and its core must have sufficient plasticity and toughness to withstand a certain impact force. ...

AI Technical Summary

Problems solved by technology

[0003] The quality problems of ordinary ring sensor induction hardening for camshafts mainly include: when the cam is heated, due to the sharp angle effect at the tip of the cam, the magnetic lines of induction are relatively dense, and it is easy to generate a large temperature difference with the base circle, so that the tip of the cam There is a large difference in the depth of the hardened layer after quenching between the base circle part and the base circle part, which may even cause overheating or melting of the cam lobe tip, and may easily cause cracking of the cam lobe tip part or a quenched soft zone at the base circle part, etc.

[0004] The quality problems of induction hardening with traditional profiling inductors for camshafts mainly include: profiling sensors have high requirements on the positioning accuracy of workpieces, and multiple cams on different planes cannot enter the induction circle continuously at one time. It needs to be disassembled once, and it is difficult to ensure that the joints of the induction coil are in good contact each time. The stability of product quality is poor and the production efficiency is low, so it is not suitable for mass production.

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