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Knowledge： Special forming of CNC Punch: group Hole sheet metal stamping 3
technical proposal
Next, we can give the corresponding technical scheme aiming at the most difficult micro-hole distance and micro-size group-hole stamping in the application of group hole stamping.
The so-called micro-size group hole stamping refers to the group hole punching method, which is very close to the diameter of each single hole and the thickness of the plate, if divided according to the material. Then, within the following proportions, the size of the hole conforms to the definition of the micro-hole: for the aluminum plate, the diameter of the single hole is 50% / 120% of the thickness of the plate; For carbon steel plate, the diameter of single hole is 75% ~ 120% of plate thickness, and for stainless steel plate, the diameter of single hole is 100% ~ 150% of plate thickness.
The so-called micro-hole spacing group hole stamping means that the margin between each single hole is very close to the thickness of the plate, although the aperture of each single hole is much larger than that of the plate thickness. The biggest difficulty in this way is the distortion and deformation of the interhole material in the process of repeated stamping.
The problem of the micro-hole/ micro-hole punching is that the part of the punching needle of the group-hole die is easy to generate the broken needle. The reason for this problem is that, due to the accuracy of the machine tool and the mold, and the holding problem for the punching needle, unnecessary scraping or twisting of the punching needle and the side edge of the lower mold leads to the frequent occurrence of the broken needle.
Pre-conditions for micro-hole / macro-hole stamping:
（1） the sheet metal factory is guaranteed to use a well-known CNC punch machine on the market. As the equipment in the Chinese market is so abundant and the price varies from 40 to 6 million yuan, so the price varies from 40 to 6 million yuan. Users first have to have a correct evaluation of the CNC punch they use to see whether the equipment is used to meet the needs of general punches or higher requirements to determine whether the project is on board or not.
（2）Even for branded machine tools, we need to look at the state of use of the equipment, and we have to use mechanical, or photoelectric, alignment rods (figure 5), and carefully test the medium-to-moderate of the stations planned to be used, and we have to use the mechanical or photoelectric alignment rod (figure 5). If the station has lost its proper alignment, the project will not be able to proceed.
5 photoelectric alignment rod
（3）In addition, the use unit should also check whether the clamp status of the machine is intact or not, and whether the screw and the movement unit are working properly to prevent the positioning failure during the plate movement.
（4）The unit will also need to confirm with the end customer whether the component allows the mold to be lubricated in an oil bath at the time of processing, whether the plate surface is allowed to brush oil, and if the customer permits the use of lubricating oil. Then make sure that your own machine tool is equipped with gas blowing or dripping oil bath lubrication. If you have to open it, if not, you need to buy more than one group of hole molds to prevent unnecessary punching and overheating of the die during the stamping process. Eventually lead to die wear and tear and even scrap.
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