What are the factors that affect the processing quality of metal drawing parts?
- Material selection
Various materials have different tensile properties. The ratio of blank diameter to punching diameter is the ultimate drawing speed. Stainless steel ranges from 1 to 2.2, carbon steel from 2.15 to 2.5. In addition to heat treatment, stainless steel materials can also be subjected to secondary stretching, but unlike carbon steel materials, stainless steel materials generally cannot be stretched like the first time except for heat treatment. Stretch like that. Stainless steel pipe needs to be one to two times larger than carbon steel. In general, double-acting deep-drawing hydraulics are preferred.
Second, choose lubricating oil
The choice of lubricant should consider two factors. A scratch-resistant and friction-reducing oil film must be provided. Plus, it’s easy to remove all of it once the deep flush is done. It can contain chlorinated or sulfurized oils or waxes, heavy washes or deep soaps. deep drawing is a method of forming cylindrical or box-shaped hardware from a ring or metal die screwed into a thin sheet of metal material. Commonly used gold materials are stainless steel, aluminum, iron, copper, etc. Metal deep flush products are available in different heights.
If there is a deviation in the stretch, what is the reason?
For blanking parts, if the punching size deviates, the specific reason is that there is a problem with the mold structure design or product material. Also, there may be a problem with the device. In this regard, we should investigate one by one to find out the real cause, fundamentally solve the problem, and prevent it from happening again.
The dimensional accuracy of drawn hardware parts refers to the difference between the actual size and the design size of the stamping part. The difference is small and the precision is high. Ideally, the punched and die edges are the same size, and the punched and punched edges have the same size. In fact, due to the force on the workpiece during the blanking process, a certain elastic deformation will occur.
After blanking, the elastic recovery of the workpiece leads to the mismatch of the dimensions of the blanking part, the die edge part, the punching part and the punching part, which affects the precision of part of the metal blanking. In addition, there are many factors that affect the dimensional accuracy of stamping parts, such as blanking gap, mold manufacturing accuracy, material properties, stamping part thickness, shape, size, etc.
The most important thing is the blanking gap. Because the gap between the punch and the mold is too large, the stretching effect on the material is large during the blanking process, so the tensile deformation is large. Due to the rebound after blanking, the size of the blanking part is reduced, and the size of the punched part is increased. If the gap is too small, the material will be compressed due to the extrusion of the punch and die. Due to the elastic recovery of the material, the size of the stamping part increases and the size of the stamping part decreases.
The above content involves the processing of hardware products, and the dimensional accuracy of the final stamping parts is also related to the characteristics and thickness of the material. However, for the general stamping parts manufacturer, due to the small variation in material thickness, such conclusions and explanations can be drawn. I hope the above will be useful to readers.