What should be paid attention to in the design of continuous drawing die?

What should be paid attention to in the design of continuous drawing die?

The design of continuous drawing mold requires that the mold parts have sufficient strength, and the selection of materials should not be wrong. The mold should avoid external convex and concave parts that have nothing to do with the mechanism, and the external edge should be chamfered. In principle, the guide post is installed on the lower mold and away from the operator. The center force of the mold is close to the center line of the mold handle. Important parts such as the guide and positioning must be clearly seen by the operator. The design should take into account the convenience of operation, adjustment, installation, repair, transportation and storage, which is relatively safe for operators. In addition, we usually need to pay attention to the following matters.

• 1. The number of work steps should be determined reasonably: the number of work steps of the continuous stretching die is equal to the sum of the decomposed single processes;
• 2. When arranging the punching and blanking process sequence, the punching process should be placed in front, so that not only the direct feeding of the tape can be ensured, but also the punched hole can be used as a guide positioning hole to improve The accuracy of the workpiece.
• 3. In the workpiece without circular holes, in order to improve the accuracy of the feeding step, a process hole can be designed in the first step of the die, so that the process hole can be used as a guide and positioning to improve the accuracy of the punching part.
• 4. Different holes with higher accuracy requirements of the same size benchmark should be formed in the same step without affecting the strength of the die.

When disassembling the continuous stretching mold, pay attention to the original condition of the mold, so that it can be easily restored during subsequent mold 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 whether the gap between the insert and the die is uniform, and whether the gap between the die and the punch is even when changing the die. After grinding the punch, the punch is shortened and the gasket needs to be added to reach the required length. It is necessary to check whether the effective length of the punch is sufficient.

To replace the broken punch, it is necessary to find out the reason, and check whether the corresponding concave mold has chipping and whether it is necessary 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 concave die is even with the surface of the die. 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 mold and the concave mold pad are installed reversely, whether the blanking hole is blocked, and whether new parts need to be replaced. Stealing material, whether the material needs to be stolen is enough, and whether the mold needs to be locked tightly.

Pay attention to the confirmation of the locking of the stripper plate screws.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 accuracy of the mold is reduced.