1. Ensure the mold gap, which refers to the sum of the gaps on both sides when the punch enters the lower mold. Different plate thicknesses and different materials should choose lower molds with different clearances. Choosing a suitable mold gap can ensure good punching quality, reduce burrs and collapse, keep the sheet flat, effectively prevent stripping, and extend the life of the mold.
2. 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. It can be polished with fine oil stone to remove the sticky material, and the polishing direction should be the same as the direction of movement of the punch.
3. If a lot of holes are punched on a board, you should punch every other hole first, and then return to punch the remaining holes, which effectively relieves the stress accumulation during sequential punching in the same direction, and will also make the front and rear two sets of holes The stresses cancel each other out, thereby reducing the deformation of the sheet.
4. 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 increase the wear. In severe cases, the lower die will be scratched and the upper and lower dies will be scratched. Damaged at the same time.
5. Timely sharpening can effectively extend the service life of the mold. When the die edge wear produces a circular arc with a radius of about 0.10 mm, sharpening is required. When sharpening, the grinding amount is 0.03~0.05mm each time, and the grinding is repeated until the punch is sharp. After sharpening, polish the cutting edge with oil stone to remove burrs, and apply lubricating oil after demagnetization treatment.
6. Regularly check the alignment of the upper and lower mold bases of the turntable. If the centering of the punch die position is not good, the die will be quickly passivated and the processing quality of the workpiece will deteriorate. Check and lubricate the die holes and guide keys on the turntable, and repair them in time if damaged; clean the lower die seat of the turntable so that the lower die can be installed accurately, and check the wear of its keys or key grooves, and replace them if necessary; use special mandrels Calibrate the mold station, and adjust in time if there is a deviation.
