Several aspects to improve the processing accuracy and quality of stamping dies

Ways to eliminate and reduce sticky materials

Due to the pressure and heat during stamping, the small particles of the sheet material will be bonded to the surface of the punch, resulting in poor punching quality. Removal of sticky materials can be polished with fine oilstone, and the direction of polishing should be the same as the direction of the punch movement, so that further sticky materials will be avoided after light. Don't use roving cloth for sanding, so as to avoid the punch surface is rougher and sticky material is more likely to appear.

Reasonable mold clearance, good stamping process, and necessary sheet material lubrication will reduce the occurrence of sticky materials. To prevent overheating, lubrication is generally used, which will reduce friction. If lubrication is not possible or the scrap rebound occurs, the following methods can be adopted: alternately using multiple punches of the same size to stamp in turn, which can make it have a longer cooling time before being reused; stop using the overheated mold; control by programming Change the mold, interrupt the long-term repetitive work, or reduce the punching frequency.

Measures to prevent sheet metal deformation when punching a lot of holes (Guide: Timely mold sharpening can effectively extend the service life of the mold)

If many holes are punched on a plate, the plate cannot be kept flat due to the accumulation of punching stress. Each time a hole is punched, the material around the hole deforms downwards, causing tensile stress on the upper surface of the sheet and compressive stress on the lower surface. For a small amount of punching, the effect is not obvious, but when the number of punching increases, tensile and compressive stresses accumulate somewhere until the material is deformed. One way to eliminate this kind of deformation is to punch every other hole first, and then return to punch the remaining holes. Although this will also generate stress, it relieves the stress accumulation during sequential punching in the same direction, and also makes the stresses of the two sets of holes offset each other, thereby preventing the deformation of the sheet.

Try to avoid punching narrow strips

When the die is used to punch a sheet with a width less than the thickness of the sheet, the punch will bend and deform due to lateral force, which will cause the gap on one side to be too small or aggravate the wear. In severe cases, the lower die will be scratched. The upper and lower molds are damaged at the same time. It is recommended not to nibble narrow sheets with a width less than 2.5 times the thickness of the sheet. When cutting a narrow strip, the sheet tends to bend into the die opening instead of being completely cut off, or even wedged into the side of the die. If the above situation cannot be avoided, it is recommended to use a fully guided die with a return plate that supports the punch.

The overhaul of the punch die position when the neutrality is not good

If the centering of the punch die position is not good, which causes rapid passivation of the die and poor processing quality of the workpiece, the following points can be repaired:

Check the level of the machine tool and re-adjust if necessary; check and lubricate the die holes and guide keys on the turntable, and repair it in time if any damage; clean the lower die seat of the turntable for accurate installation of the lower die, and check its keys or If the keyway is worn, replace it if necessary; use a special mandrel to calibrate the mold position, and adjust it in time if there is any deviation.

The above content is for the general situation. In view of the different specifications of the specific types of punches and molds, users should also understand and summarize experience in combination with actual conditions to give play to the best performance of the mold.

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