1. Maintenance of unloading plate
Disassembly method of unloading plate:
You can first use two screwdrivers to balance and pry up, and then use both hands to balance and remove the force.

Analysis of disassembly reasons:
Identify the cause and take appropriate measures, do not blindly handle it. When encountering difficulties in disassembly, it is necessary to check whether the inside of the mold is clean, whether all locking screws have been removed, and whether there is any damage to the mold caused by material jamming.

Precautions for disassembly and assembly:
When assembling the unloading plate, first clean the punch and unloading plate, add lubricating oil to the guide column and punch inlet, place them steadily, then press them in place with both hands and repeat several times. If it is too tight, the cause should be identified (whether the guide column and guide sleeve guide are normal, whether there is damage to each part, whether the new convex mold can pass through the unloading plate position smoothly, and whether the position is correct), and the cause should be identified before taking corresponding measures.
If there are pressure blocks on the fixed plate, check whether there is enough material theft on the unloading backboard. The material contact surface between the discharge plate and the concave mold is pressed for a long time to produce indentation (the gap between the discharge plate and the concave mold is generally 0.03-0.05mm less than the material thickness);
The sleeve should be checked for accuracy when it is not high, as it can cause the unloading plate to tilt and its precise guidance and smooth pressure function to be compromised;
When the indentation is severe, it will affect the compression accuracy of the material, causing abnormal and unstable product dimensions. It is necessary to repair or re grind the discharge insert and discharge plate. It needs to be maintained.

2. Adjustment of mold clearance
When the gap is large, there are more cross-sections and larger burrs. When the gap is small, there are fewer cross-sections. To obtain a reasonable gap, displacement should be used. After adjustment, appropriate records should be made, and marks can also be made on the edge of the concave mold for subsequent maintenance operations.
The positioning holes of the mold core are worn out due to frequent and multiple combinations of the mold core, resulting in large gaps (loosening after assembly) or uneven gaps (positioning deviation), which can cause the cross-sectional shape to deteriorate after punching, the convex mold to break easily, and burrs to occur. By checking the cross-sectional condition after punching, appropriate gap adjustments can be made.
In daily production, attention should be paid to collecting and preserving the raw material strip in the best condition of the mold. If the subsequent production is not smooth or the mold has variations, it can be used as a reference for mold maintenance. In addition, auxiliary systems such as the top material pin should be checked and maintained for wear and tear, whether they can top the material, and whether the guide nail and liner are worn.

3. Inspection of guiding parts
The wear and tear of the guide components and the damage to their accuracy can reduce the precision of the mold, causing problems in various parts of the mold. Therefore, appropriate maintenance and regular replacement are necessary.
What is the clearance between the guide column and guide sleeve, whether there are burn or wear marks, and whether the oil supply status of the mold guide is normal should be checked.
Check the condition of the springs (unloading springs, top springs, etc.) to see if they are broken, or if they have been used for a long time without breaking, but have lost their original strength due to fatigue. Regular maintenance and replacement must be carried out to check the accuracy of the guiding parts. If the guiding nail is worn and has lost its proper guiding accuracy and function, it must be replaced. Otherwise, it may cause damage to the mold or hinder production.

4. Maintenance of convex and concave molds
When replacing the convex mold, it is necessary to test whether the discharge block and concave mold are smoothly inserted, and whether the gap between the insertion and the concave mold is uniform. When replacing the concave mold, it is also necessary to test whether the gap between the insertion and the punch is uniform.
When disassembling the convex and concave molds, attention should be paid to the original condition of the mold, so that it can be easily restored during subsequent mold installation. If there are additional pads or displacement, the thickness of the pads should be engraved on the parts and recorded.
In order to reduce the length of the convex mold after grinding, it is necessary to add shims to achieve the required length. It is necessary to check whether the effective length of the convex mold is sufficient. To replace a broken convex mold, the cause should be identified, and the corresponding concave mold should be checked for any broken edges and whether grinding of the edges is necessary.
After installation, it is necessary to check whether the concave mold surface is flat with the mold surface. When assembling the convex mold, it is necessary to check whether the gap between the convex mold and the fixed block or plate is sufficient. If there is a pressure block, it is necessary to check whether there is enough clearance left. The assembled concave mold should be placed horizontally, and then placed on the concave mold surface with a flat iron block. Use a copper rod to gently tap it into place, and do not forcefully knock it in diagonally. The bottom of the concave mold should be chamfered.
After the assembly of the convex mold, concave mold, and mold core, necessary inspections should be carried out on the care belt to ensure that all parts are installed correctly or in reverse. Check whether the concave mold and concave mold cushion block are installed in reverse, whether the feeding hole is blocked, whether new parts need to be stolen, whether there is enough need for stealing, and whether the parts of the mold that need to be locked are locked.
Pay attention to the confirmation of the locking of the stripping plate screws. When locking, it should be done from the inside out, with balanced and cross locking force. Do not lock one screw first and then lock another screw to avoid tilting the stripping plate and causing the convex mold to break or the mold accuracy to decrease.