With the continuous progress of optical fiber laser technology and the continuous decline of laser processing cost, an obvious trend has emerged in the sheet metal processing market, which is to gradually transfer the products below the medium batch that were originally used for CNC punching to CNC laser cutting machines. However, people in the industry also clearly realize that the CNC punching machine still has its irreplaceable advantages, which are mainly embodied in the following aspects: sheet metal processing combined with CNC stamping forming; Large batch of non trimming punching type sheet metal processing; Sheet metal processing of dense mesh.
At present, these three kinds of sheet metal processing are closely dependent on the characteristics of CNC punch, and still produce huge economic benefits in the process of sheet metal processing.
Solution
This paper discusses how to finish high quality dense mesh stamping under the condition of reasonable operating cost.
technical requirement
Mesh parts generally include the following types of products: ventilation door panels of cabinet base stations, ordinary wall panels and ceilings of subway tunnels, screens of fluid equipment, and sound attenuation wall panels of public facilities such as theaters and venues.
Technical requirements for mesh punching of different products: ⑴ The mesh of the cabinet category requires greater ventilation efficiency, so there is a higher requirement for density; (2) Tunnel wallboard and ceiling are relatively for limited noise reduction and weight reduction, so there are more requirements for flatness to facilitate on-site assembly; (3) In addition to the requirements for passing efficiency, the fluid screen also has high requirements for the rigidity of parts due to the pressure brought by the fluid itself; (4) Silencing wallboards for public facilities often require smaller hole diameters, and have high requirements for product surface quality.
It can be seen from the above that the dense mesh punching we discussed is not a simple "screen punching", but an efficient sheet metal processing process with a certain technical content, and will cause massive economic losses due to the negligence of the processing manufacturer on some technical requirements. These losses are not only reflected in the large amount of rapid loss of ordinary molds, but also in the secondary and tertiary processing that has to be carried out for this purpose, And the resulting unexpected defective rate and scrap rate.
special requirements
Typical group hole punching cases and corresponding technical requirements.
⑴ The customer is not allowed to level the dense mesh plate for the second time (Fig. 1). The technical difficulties of this kind of perforated plate mainly lie in the huge deflection after multi hole punching and the plate collision accident during the punching process caused by the plate warping.
Fig. 1 Punching without leveling
(2) Dense perforated plate with hole spacing very close to the plate thickness. The technical difficulty of this kind of mesh plate is the material between the mesh holes. Because of the torsion caused by too close hole spacing, it is easy to cause the scrapping of the whole mesh plate.
(3) Dense perforated plate with aperture close to the plate thickness. The technical difficulty of this kind of perforated plate is that the hole diameter is almost close to or even less than the plate thickness, which causes frequent needle breakage of the die during the stamping process, making the entire stamping efficiency too low, leading to high costs.
(4) Dense perforated plate with relatively hard material. The technical difficulty of this kind of perforated plate is that due to the large shear strength of the plate material, it causes rapid wear of the die punch pin, and increases the frequency of broken pins, leading to ultra-high product scrap rate and die consumption rate.
(5) Dense mesh plate made of aluminum/aluminum alloy. The technical difficulty of this kind of perforated plate is that a large amount of aluminum chips will be produced during the aluminum plate stamping process, which will stick to the mold surface and the inside of the mold guide sleeve, causing rapid wear and even scrapping of the mold in the repeated rolling process.
