How to solve the natural aging of Stamping Parts
Stamping Parts after intense forming after processing, has been placed without, due to the role of residual stress, often occurs longitudinal cracks. But the amount of nickel containing a large number of austenitic stainless steel plate that SUS304 above the material, even if the crack crack processing, it will not produce natural aging cracks. In addition, the use of brass and other copper alloy plate, after the formation of the stamping has been placed, but also tend to produce longitudinal cracks. The reason is related to the residual stress and the surrounding atmosphere.
General crankshaft presses, the nominal pressure stroke is only 5 to 7% of the stroke of the punch, and at the middle of the stroke, the pressure is only 40 to 50% of the nominal pressure. The swing trimming process, because of its large force stroke, it can not be selected according to the rated pressure press, but according to the allowable load curve (Figure 11) to choose. This curve can be found in the press description.
Stamping Parts processing mold design considerations
1) shear gap: punch and die in the axial position should maintain a certain shear gap, the size of the gap with the thickness of the blank, its value can be adjusted by the punch and the difference between the height of the ring To guarantee.
2) the choice of press: swing horizontal cutting process and drawing process, the need for a larger trip, in order to facilitate the pick and place the workpiece, the general requirements of the stroke S is greater than the workpiece height of 2.2 times.
3) Core: the depth of the trimming die is determined by the core, the height of the core is determined by the size of the workpiece. In the process of punching and shearing, the core can be tilted with the die, and when the upper mold is released from the die, the three steel balls are centered on the spring so that the next stroke can smoothly enter the workpiece.
4) Elastic force: the slider and the top ring must be sufficient by the elastic force, or cut out of the drawing parts will appear too large or uneven burrs, and even cut the phenomenon.
Metallic Stamping Parts surface roughness surface roughness elimination method
1. In the processing of metal Stamping Parts, the deformation part of the surface rough. Surface roughness of more than ten microns or more, the general paint 2-4 times to cover, but the paint finish is not good, so still difficult to make up the surface rough. Thus, when the surface roughness occurs, or sprayed with a layer of atomized putties, or as needed, with a sander to remove it.
2. Stamping Parts is generally believed that the surface roughness is closely related to the grain size of the material. The annealing of the calendered material can change the size of the grains. Under normal circumstances, the higher the crystallization temperature, the smaller the calendering rate, and the longer the treatment time, the larger the grain. If the grain size is large, the tensile strength is lowered, and the elongation is improved and the hardness is lowered. Therefore, when the rp is formed in a large shape or in the shape of bulging, the grain size is large, and its formability and shape are stable Performance is also good. However, bulging too much, grain thick, will cause the surface rough.
When deep drawing, select the strength limit is large, that is, smaller grain material is better. It is necessary to use a material which is not easy to produce a surface roughness, Stamping Parts or even if the surface roughness occurs somewhat, but does not cause a large problem. However, when a material having a rough surface is liable to be used, Material production plant in advance to reach an agreement, so that the production does not occur accident.
3. The surface roughness caused by processing is characterized by being limited to parts that exceed the machining limit. When the surface roughness further development, there will be "groove", that part of the thickness of the local thinning, conditions such as further deterioration, it will break.
Preventing Stamping Parts This rough surface is to find the cause of the occurrence, the most necessary way to deal with the surface roughness of the deformation is reduced. For example: change the forming conditions; change the shape of the formation; the process separately,