What is the quality control of the induction quenching and tempering process of steel parts

(1) Design and selection of inductor

 

The structure, shape and dimension precision of inductor and water sprayer should meet the requirements.

 

(2) Inspection of sensors

 

Check the cooler and related fixtures, and confirm the deformation and damage of the inductor and the state of the coil.Also check and clean the outlet of the cooler, and confirm that the fixture can operate normally.Good contact must be maintained between inductor and transformer end plate.

 

(3) Clamping of the workpiece

 

During clamping, the relative position between the workpiece and the inductor should be strictly kept correct, especially the eccentricity and tilt should be paid attention to to ensure the heating and cooling speed is relatively uniform.Avoid the failure of contact discharge between inductor and workpiece due to expansion and distortion caused by local heating of workpiece.

 

(4) Quenching heating and cooling of the workpiece

 

According to the workpiece, equipment conditions and test results, determine the heating process parameters, such as power or circuit voltage, heating temperature, heating time or workpiece feed speed.Select appropriate cooling medium, test to determine the cooling process parameters, such as medium temperature, pressure, flow, concentration range and cooling time.Pressure quenching can also be used to control workpiece distortion when necessary.

 

(5) Tempering heating and cooling of the workpiece

 

When tempering heating and cooling, confirm the heating and cooling conditions, in order to avoid cracking, distortion and other defects should be tempering in time after quenching, can also use the method of self-tempering.The tempering temperature should be selected to obtain the specified performance of the workpiece and its surface.

 

(6) Straightening treatment after High frequency induction heating machine quenching and tempering

 

After the heat treatment of the workpiece to be straightened should ensure that the residual stress generated by the straightening does not hinder the subsequent machining and use, if necessary, should be de-stress treatment.

 

(7) Records

The process shall be recorded in accordance with the regulations and process requirements and properly kept for future use.