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Knowledge: Numerical control punch special forming: sheet metal group hole stamping 1
With the continuous progress of optical fiber laser technology and the continuous decline of laser processing costs, there is a clear trend in the sheet metal processing market, that is, the medium batch products originally used for numerical control punch stamping, Gradually transferred to CNC laser cutting machine to complete. However, people in the industry also clearly realize that CNC punching machine still has its irreplaceable superiority, which is embodied in the following aspects: sheet metal machining combined with NC stamping forming, large batch of non-cut punched sheet metal machining, and non-cutting punched sheet metal machining in large quantities, and the advantages of numerical control punching machine are summarized as follows: sheet metal machining combined with numerical control stamping forming; Dense mesh sheet metal processing.
At present, these three kinds of sheet metal machining depend on the characteristics of numerical control punch, and still produce great economic benefits in sheet metal processing.
solve scheme
This paper discusses how to finish high-quality dense mesh stamping with reasonable operating cost.
technical requirement
The mesh parts have the following kinds of products: ventilation door panel of cabinet base station, ordinary wall panel of subway tunnel and ceiling, screen of fluid equipment, silencing wall panel of public facilities such as theater meeting place.
The technical requirements of mesh stamping for different products are as follows: (1) the mesh of cabinet type requires greater ventilation efficiency, so it has higher requirements for density; (2) Tunnel wallboard and smallpox are relatively for limited noise reduction and weight reduction, so there are more requirements for flatness, so it is convenient to assemble on site; (3) in addition to the requirement for the passing efficiency, the pressure brought by the fluid itself has a higher requirement for the stiffness of the parts; (4) the silencing wall panels of public facilities usually require small diameter of holes and high surface quality of the products.
As can be seen from the above, the dense mesh stamping we are discussing is not a simple "screen", but an efficient sheet metal processing process with a certain technical content. And it will cause massive economic losses due to the neglect of manufacturers for some technical requirements. These losses are not only reflected in a large number of rapid wear and tear of common moulds, but also in the secondary and tertiary processing that have to be carried out for this purpose. As well as the resulting unexpected defective rate and scrap rate.
special requirements
Typical group hole stamping case and corresponding technical requirements.
The customer does not allow secondary levelling of dense mesh plates (figure 1). The technical difficulties of this kind of mesh plate mainly lie in the large deflection after the group hole stamping and the collision accident in the process of stamping due to the warping of the plate.
1 stamping without leveling
（2）A dense mesh plate with a very close distance to the thickness of the plate. The technical difficulty of this kind of mesh plate lies in the material between the mesh holes, because of the torsion caused by the distance between the holes too close, it is easy to cause the scrapping of the whole mesh plate.
（3）A dense mesh plate with a diameter very close to the thickness of the plate. The technical difficulty of this kind of mesh plate is that the aperture is almost close to or even smaller than the thickness of the plate, which causes the die to break the needle frequently in the stamping process, which makes the whole stamping efficiency too low and the cost too high.
（4）A hard, dense mesh plate. The technical difficulty of this kind of mesh plate lies in that the high shear strength of the sheet material causes the rapid wear and tear of the punching needle of the die and aggravates the frequency of the broken needle, which leads to the ultra-high scrap rate of the product and the wear rate of the die.
（5）Aluminum / aluminum alloy dense mesh plate. The technical difficulty of this kind of mesh plate is that a large amount of aluminum debris will be produced in the stamping process, which will stick on the surface of the die and inside the guide sleeve of the die. In the process of repeated rolling, the rapid wear and even end-of-life of the die will be caused.
The above-mentioned five mesh plate sheet metal stamping, basically covers the current manufacturers encountered more headache problems, and always lingering.
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