2. Before closing the mold, a silicon steel sheet should be padded between the upper and lower molds to prevent the knife edge from being damaged during handling.
3. Before the die is fitted with the punch, the burrs at the bottom and top should be ground off with an oilstone, and the garbage should be cleaned up with a cloth. If there are burrs or rubbish on the upper and lower planes of the die, the burr of the punching sheet will be out of tolerance.
4. Adjust the stroke of the slider to a proper position and press the upper die. It is necessary to ensure that the upper plane of the die handle or die holder is closely attached to the bottom surface of the slider, and gently press the lower die plate screw. Then, adjust the slider upwards and take out the silicon steel sheet in the middle. Loosen the lower die press plate screw, adjust the slider downwards until the punch enters the female die for 3~4mm, and press down the lower die press plate screw. When punching a new die, the punch must enter the female die for 3~4mm, otherwise the punch will collapse or the female die will crack.
5. Raise the slider to the top dead center position, adjust the stop screw of the punch until the tightness is appropriate, and then idle for several times to observe whether the die and punch mechanism work normally. If there is no abnormality, production can be started.
Description of die structure:
The die on the punching machine is the upper part of the whole set of dies, that is, the die part installed on the slide block of the press. The upper die holder is the uppermost plate-shaped part of the upper die. When the workpiece is pressed on the press slide block, it is fixed with the press slide block through the die handle or directly. The lower die is the lower half of the whole set of dies, that is, the die part installed on the workbench of the press. The lower die holder is a plate-shaped part at the bottom of the lower die, which is directly fixed on the workbench or backing plate of the press when working. The side wall is the side wall of the cutting edge of the punching die hole. The inclination of the cutting edge is the inclination of each side of the side wall of the punching die hole. Air cushion is an ejector powered by compressed air. See "Ejector". The reverse side pressing block is a component that supports the one-way punch from the other side of the working face.
The punch guide sleeve is a tubular part that provides accurate guidance for the relative movement of the upper and lower die holders. Most of it is fixed in the upper die holder and used in conjunction with the guide post fixed in the lower die holder. The guide plate is a plate-shaped part, which has an inner hole accurately matched with the punch to ensure the mutual alignment between the punch and the die and discharge the part. The guide post is a cylindrical part, which provides accurate guidance for the relative movement of the upper and lower die holders. Most of them are fixed on the lower die holder, and used in cooperation with the guide sleeve fixed on the upper die holder. The locating pin is a pin-shaped part that extends into the material hole and is used to adjust its position in the female die. The guide plate die is a die guided by the guide plate, and the punch does not leave the guide plate when using the die. The material guide plate is a plate-shaped guide component that guides the strip (strip, coil) into the female die. Guide post mould base is a mould base in which guide post and guide sleeve slide each other. (See "Mold base").
Maintenance:
1. Ensuring the best die gap refers to the sum of the gaps on both sides when the punch enters the lower die. Different thickness and materials should choose the lower die with different gaps. Choosing the appropriate die gap can ensure good stamping quality, reduce burrs and edge collapse, keep the sheet flat, effectively prevent material from being taken, and prolong the die life.
2. Timely grinding can effectively prolong the service life of the mold. When the wear of the die cutting edge produces an arc with a radius of about 0. 10mm, it needs to be sharpened. When grinding, the grinding amount is 0.03~0.05mm each time, and the punch is sharpened repeatedly. After polishing, polish the cutting edge with oilstone to remove burrs, demagnetize and apply lubricating oil.
3. Regularly check the alignment of the upper and lower die holders of the turntable. If the position of the die is not well aligned, the die will be passivated quickly and the machining quality of the workpiece will become worse. Check and lubricate the die holes and guide keys on the turntable, and repair them in time if they are damaged; Clean the lower die seat of the turntable so that the lower die can be installed accurately, and check the wear of its key or keyway and replace it if necessary; Calibrate the mold station with a special mandrel, and adjust it in time if there is any deviation.
4. When stamping soft or sticky materials (such as aluminum); Perforated abrasive materials (such as glass epoxy sheets); Stamping hard materials (such as stainless steel); For punches with frequent punching and surface hardening (titanium plating, nitriding, etc.). And the molecular structure thickness is 12~60μm).
5. The molding die should gradually fine-tune the impact head from the lowest position to the appropriate position, otherwise it will easily damage the die.
6. Due to the pressure and heat in the stamping process, the fine particles of sheet metal will stick to the surface of the punch, resulting in poor stamping quality. Viscous materials can be polished with fine oilstone in the same direction as the punch.
7. If a lot of holes are punched in a plate, one hole should be punched every other hole first, and then the remaining holes should be punched back, which effectively relieves the stress accumulation during continuous punching in the same direction and offsets the stress of the two groups of holes before and after, thus reducing the deformation of the plate.
8. Try to avoid punching too narrow a strip. When stamping a sheet with a width less than the thickness of the sheet with a die, the punch will bend and deform due to the lateral force, which will make the gap on one side too small or aggravate the wear. In severe cases, it will scratch the lower die and damage the upper and lower dies at the same time.