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Knowledge: Special forming of CNC Punch: group Hole sheet metal stamping 2
At the same time, many manufacturers have adopted a number of wrong methods in the process, leading to further exacerbation of the problem, such as:
(1)The use of a medium-to-moderate CNC punch is worse, and cannot even be guaranteed on a moderate-to-moderate CNC punch. Some brands of CNC punches with large sizes (such as D and E stations for thick turret type punches) are in fact very bad at moderate levels. In addition, even well-known CNC punches, if they are not well maintained and maintained, Its medium will also be lost over time. If the wrong choice of the station at this time, then the quality of the mold, the idea of the plan will be empty talk.
(2)The mould guide sleeve with poor alignment accuracy is used. When selecting the guide sleeve for group hole stamping, the manufacturer must use the guide sleeve with high guidance precision, high matching degree with the work station, and the same time, the guide sleeve with a certain reputation should be used, and the newer the better, the better. The guiding accuracy of guide sleeve is closely related to all kinds of quality problems encountered in group hole stamping.
(3)The use of poor material, red hardness index is too low punch and die. Group hole stamping is a kind of dense machining process, so the punching frequency of punched needle in group hole die is much higher than that of common die. Especially many manufacturers because of the limitation of station or capital, often use a set of group hole mold to hit tens of thousands of mesh, the quality of punching core and die material, as well as the difference of red hardness, will directly determine whether the group hole stamping success or not. Because the inferior punches will cause the hardness to fail too quickly because of the continuous high temperature, leading to a serious quality accident.
(4)A punch with too much surface roughness or no coating is used. The edge of many inferior punching cores has not been refined, so the roughness of the side of the edge is very large, resulting in a huge coefficient of friction, resulting in the formation of debris on the surface of the punching core easily. And in the stamping process repeatedly extruding the core and die, resulting in rapid scrapping. When stamping stainless steel sheet and aluminum plate, the blanking without coating will result in rapid passivation of the die under the double influence of adhesion wear and extrusion wear.
(5)The wrong group hole pattern was used. Group hole mold typesetting is also a knowledge, many engineers mistakenly believe that the number of holes in the typography, the more the number of holes, the better, this is actually a huge efficiency black hole.
(6)Incorrect programming and path was used. The programming of group hole stamping is also a profound knowledge. After some engineers import the tool into the software, they directly start the automatic typesetting path, and directly adopt this path as the path of the group hole stamping. It should be emphasized here that different software produced by different companies, because of their different core algorithms, will produce a different path of efficiency and different effects, resulting in different quality of mesh plate products. In addition, because of laziness, some engineers even press the group hole die sequentially, pushing the accumulated deformation potential energy to one end of the sheet, resulting in a very serious warpage.
(7)The wrong stamping method was used. There are many sheet metal processing manufacturers, using a B-position die to press mesh products. Regardless of the severe inefficiency caused by tens of thousands of stamping, the sheet warpage caused by the excess deformation potential energy caused by the ten thousand stamping times is very large.
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