The application of stamping oil is very extensive, but not every stamping factory will use stamping oil. Some factories, in order to save surface costs, may use waste oil or engine oil for general materials, rarely using professional stamping oil.
In the stamping process, due to the different materials being stamped, the working speed of the stamping machine, the stretch ratio of the workpiece, the shape of the workpiece, and the requirements of the subsequent processes, all these factors determine the type of stamping oil they use.
Therefore, when choosing stamping oil, it is necessary to carefully investigate the following aspects:
- What kind of stamping process is it: punching? Deep drawing? Thin-wall drawing? Bending?
- What is the material of the workpiece: what kind of steel? Aluminum, copper, alloy, silicon steel sheet?
- What is the stretch ratio? How many times is it deep drawn?
- What is the tonnage of the stamping machine? Working speed?
- What is the shape of the workpiece? Where are the problems shown by the waste in the trial deep drawing?
To answer these specific questions and understand the customer’s actual situation, you can more accurately choose the appropriate stamping oil.
At present, the stamping industry generally still prefers oil-based stamping oils, and in most cases, the choice of oil-based stamping oil formula still depends on the factory’s usage habits.
So, what specific requirements are there when choosing stamping oil for some common stamping materials and materials?
- If the material being stamped is silicon steel sheet, which is relatively easy to punch, the majority of requirements are that after punching, the surface of the workpiece can dry quickly without oil residue. At the same time, it is necessary to prevent burrs from forming during punching and extend the service life of the mold. Therefore, if it is stamping oil for silicon steel sheets, choose one with slightly higher viscosity, capable of volatilization, does not produce carbon residue after annealing, and has a certain anti-rust performance.
- If the material being stamped is tin-plated steel plate, consider choosing stamping oil that does not contain chlorine to prevent the surface of the workpiece from whitening.
- If the material being stamped is aluminum or aluminum alloy, do not choose stamping oil containing chlorine and sulfur additives, otherwise it will be easily oxidized. It is generally recommended to choose stamping oil with a neutral PH.
- If the material being stamped is stainless steel, the stamping process is prone to work hardening. It requires the use of stamping oil with high oil film strength and good anti-sintering properties, and the stamping oil must have a certain viscosity and good cooling properties.
- If you are stamping copper or copper alloys, do not choose stamping oil that contains chlorine and sulfur additives. Choose stamping oil with oily agents and good fluidity.
- If you are stamping stainless steel, it is generally recommended to choose a special stamping oil for stainless steel, which requires high antiwear properties, no burrs on the workpiece, and obvious mold protection function.
Based on whether volatilization is required, stamping oil can be simply divided into non-volatile stamping oil and volatile stamping oil.
The formula to choose depends on the stamping material, process characteristics, post-processing characteristics, and other requirements.
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