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Main points of maintenance of stamping continuous die

Update:22-08-2020
Summary:

In the process of using the continuous die, in order to […]

In the process of using the continuous die, in order to improve its performance and use and prolong its life, it needs to be maintained. However, four main points need to be paid attention to during the maintenance process, so as to grasp the focus of the continuous die and reduce the use of the die.

1. Maintenance of convex and concave moulds

When disassembling the male and female moulds, pay attention to the original condition of the mould, so that it can be easily restored during subsequent mould assembly. If there is a pad or shift, the thickness of the gasket should be engraved on the part and recorded. To replace the punch, try to insert the stripping block and the die to see if it is smooth, and try to see if the gap between the insert and the die is even, and if the gap between the die and the punch is even when replacing the die. After grinding the punch, the punch is shortened and the gasket needs to be added to reach the required length. Check whether the effective length of the punch is sufficient. To replace the broken punch, find out the reason, and check whether the corresponding concave mould has chipping and whether it needs to grind the cutting edge. When assembling the punch, check whether the gap between the punch and the fixed block or the fixed plate is sufficient. If there is a press block, check whether there is room for movement. The assembling die should be placed horizontally, and then set it with a flat iron block such as a copper rod on the die surface to tap it in place. Do not place it diagonally and force it in. The bottom of the die should be chamfered. After installation, check whether the surface of the die is even with the die surface. After the punch and die cores are assembled, the necessary inspections should be done against the material belt, whether the parts are installed incorrectly or reversely, check whether the concave mould and the concave mould pad are installed reversely, whether the blanking hole is blocked, and whether new parts are needed Stealing material, whether the material needs to be stolen is enough, and whether the mould needs to be locked tightly. Pay attention to the confirmation of the locking of the stripper plate screw. When locking, it should be cross-locked from the inside to the outside with a balanced force. Do not lock one screw first and then lock the other screw, so as to avoid the stripper plate tilting and causing the punch to break or The mould accuracy is reduced.

2. Maintenance of stripping board

To disassemble the stripper, you can first use two screwdrivers to balance the prying, and then use both hands to balance the force to take it out. When it is difficult to disassemble, check whether the inside of the mould is cleaned, whether the locking screws are completely disassembled, whether the mould is damaged by jamming, find out the reason and then do the corresponding treatment, and do not dispose of it blindly. When assembling the stripper plate, clean the punch and stripper plate first, add lubricating oil to the guide post and the lead-in place of the punch, put it in steadily, and press it in place with both hands, and repeat it several times. If it is too tight, find out the reason (whether the guide post and guide sleeve are oriented normally, whether there are damages in various parts, whether the new punch can pass the stripper plate position correctly), find out the reason and then do the corresponding treatment. If the fixed plate has a pressure block, check whether the clearance on the stripping back plate is sufficient. The material contact surface between the stripper plate and the die is stamped for a long time to produce indentation. When the indentation is serious, it will affect the pressing accuracy of the material and cause the product size to be abnormally unstable. Repair or re-grind. The contour sleeve should be checked for accuracy. When the height is not equal, the stripper plate will be tilted, and its precision guiding and smooth spring pressing function will be damaged and must be maintained.

 

 

3. Inspection of guiding parts

The clearance between the guide post and the guide sleeve, whether there are burns or wear marks, and whether the oil supply state of the mould guide is normal, should be checked. The wear of the guides and the destruction of precision reduce the precision of the mould, and various parts of the mould will have problems, which must be properly maintained and regularly replaced. Check the accuracy of the material guide. If the guide pin is worn out, it has lost the proper accuracy and function of the tape guide and must be replaced. Check the condition of the ejection spring and the ejector spring to see if it is broken or if it has not been broken after long-term use, it has been fatigued and has lost its original strength. Regular maintenance and replacement must be performed, otherwise it will cause damage to the mould or poor production.

4. Adjustment of mould gap

The mould core positioning hole is worn out due to frequent and multiple combinations of the mould core, resulting in a large gap after assembly (looseness after assembly) or uneven gap (producing positioning deviation), which will cause the shape of the section after punching to become worse and convex. Die is easy to break, produce burrs, etc. You can check the section condition after punching to make proper gap adjustment. When the gap is small, the section is less. When the gap is large, the section is more and the burr is larger. A reasonable gap can be obtained by shifting. After adjustment, it should be recorded appropriately, and marks can also be made on the edge of the die to facilitate Follow-up maintenance operations. In daily production, attention should be paid to the collection and preservation of the original mould in the best condition. If the subsequent production is not smooth or the mould is changed, it can be used as a reference for mould maintenance. In addition, the auxiliary system, such as whether the ejector pin is worn, whether it can eject the material, whether the guide pin and the bushing are worn, should be checked and maintained.

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