Stamping and drawing processing requirements
1. The shape of the tensile member should be as simple and symmetrical as possible.
In the circumferential direction, the axisymmetric tensile member is uniformly deformed, and the mold which is performed at this time is also relatively easy to process, and the workability at this time is also the best. For other shapes of tensile members, try to avoid sharp contour changes. For example, the rear cover of a car muffler, under the premise of ensuring the use requirements, the shape is simplified, the production process will be changed from one process to one process, and the material consumption will be reduced by half.
2, the proportion of the dimensions of the tensile parts should be appropriate
Design flanges and deep drawing members should be avoided as much as possible because such workpieces require more stretching. For example, the difference between the size of the workpiece and the size of the lower part is too large to meet the requirements of the stretching process. If you want to make it compound, you can divide it into two parts, respectively, and then make the connection. If the workpiece cavity is not deep, but the flange diameter is large, the manufacturing difficulty is also large, and annealing is required in the middle. If the flange diameter is reduced, intermediate annealing may not be used. The outer contour of the workpiece flange is preferably similar to the contour shape of the deep drawing portion. If the width of the flange is inconsistent, not only the stretching is difficult, but also the addition process is required, and the trimming allowance is required to increase the metal consumption.
3. The fillet radius of the tensile part should be suitable
In order to facilitate the forming and reduce the number of draws, the fillet radius of the tensile member should be increased as much as possible. The radius of the fillet between the bottom of the tensile member and the wall, the flange and the wall, and the four walls of the rectangular member should meet the requirements.
4. The unevenness of the thickness of the tensile member should be considered.
The inner and outer walls of the workpiece that are stretched multiple times or the flanged surface of the flanged tensile member shall be allowed to have impressions produced during the stretching process. Unless the workpiece has special requirements, it can be used to eliminate these marks by shaping or slashing.
5, the hole position on the tensile member should be reasonably arranged
The hole position on the tensile member is set on the main structural face so that it is held on a plane, or the wall of the hole is perpendicular to the plane, so that the punching and trimming are completed in one process.
6, the dimensional accuracy of the tensile parts should not be too high
The manufacturing precision of the tensile member includes the accuracy in the diameter direction and the accuracy in the height direction. In general, the accuracy of the tensile member should not exceed the specified value. The dimensions on the product drawing need to be marked to ensure the external dimensions or the internal cavity dimensions, and the internal dimensions cannot be marked at the same time.
7, the choice of stretching oil
In addition to the properties of the stretch oil, such as lubricity and cooling properties, the properties of the stretch oil should be considered in terms of rust resistance, cost and ease of maintenance. Stretching oils are easy to use with a relatively low viscosity base oil added to the anti-wear additive, which can achieve lubrication and anti-friction, as well as good cooling and easy to care. However, the problem of the stretching oil is that the flash point is low, the temperature is high during the press forming, the deformation is easy, the risk factor is high, and the volatilization is fast, and the user's use cost is correspondingly high, so the pressure resistance is selected as much as possible under the condition of the condition. Highly abrasive oil.
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