In the production process of metal products, metal forming technology plays a crucial role. Among them, sheet metal processing is a common metal forming method, which covers a variety of processes such as metal deep drawing and metal stamping. Metal deep drawing is the process of stretching the sheet through the deep drawing die to form the desired shape, while metal stamping is the use of stamping dies to pressure process the sheet to achieve the molding of the product. Metal stamping is one type of metal forming technology that focuses on the plastic deformation of sheet metal using presses and dies. And in the metal stamping process, the stamping die is the key tool in this process, which determines the feasibility, efficiency and quality of the stamping process.
The following is an introduction to the common problems of continuous dies in stamping molds and the tips and tricks for repairing them.
Continuous die is a kind of stamping die, it refers to the press in a stamping stroke, the use of strip stamping raw materials, in a mold with several different stations at the same time to complete a number of stamping process of cold stamping die, mold every completion of a stamping, the material belt fixed distance to move once, to the completion of the product.
Continuous mold in the stamping process, the material belt always to a direction of movement; mold internal material belt cut off to two or more directions of movement is called progressive die; material belt in the mold internal feeding completed is called automatic continuous die; in a stamping production chain of different processes in the stamping die with manipulator or other automation facilities, the use of molds or parts to complete the stamping of the workpiece to complete the stamping process of the rated die is called multi-station mold. Molds.
What are the maintenance points of continuous mold?
The maintenance of continuous mold must be done carefully and patiently step by step, do not blindly engage in, due to the failure and the need to repair the mold should be taped in order to make inquiries about the problem. After opening the mold, you should take care of the tape, check the condition of the mold, confirm the cause of failure, find out the problem, and then clean up the mold before dismantling the mold. The force should be even when dismantling the mold. For the structure where the stripper spring is between the fixed plate and the stripper plate and where the stripper spring acts directly on the guide pillar inside the mold, the dismantling of the stripper plate should ensure that the stripper plate is balanced and ejected, and the tilting of the stripper plate may lead to the fracture of the convex die inside the mold.
(I) Maintenance of convex-concave molds
1, convex and concave mold disassembly should pay attention to the original state of the mold, in order to facilitate the recovery of the subsequent molding, padding or shifting parts should be engraved with the thickness of the shim and make a record.
2、When replacing the convex mold, try to make the mold inserted into the stripped module smooth, and try to make the gap inserted into the concave mold uniform.
3, replacement of concave mold should also try to insert and punch clearance is uniform. For the shortening of the convex mold after grinding, it is necessary to add shims to achieve the required length. The effective length of the convex mold should be checked to see if it is sufficient.
4. Replace the broken convex die to find out the reason, and also check whether the corresponding concave die is chipped and whether it needs to be sharpened.
5、Assembling the convex mold to check whether there is enough clearance between the convex mold and the fixed block or fixed plate, and if there is a pressure block to check whether there is a margin of activity.
6、Assembling concave mold should be placed horizontally, and then placed on the surface of the concave mold with a flat iron block, knocked into place with a copper rod, do not tilt the force knocked in, the bottom of the concave mold should be chamfered.
The bottom of concave mold should be chamfered. The bottom of the concave mold should be chamfered. After installation, check that the surface of the concave mold is flush with the surface of the die. After the convex mold, concave mold and mold core are assembled, carry out the necessary inspections on the maintenance belt to check whether the parts are installed wrongly or inversely, whether the concave mold and concave mold pad are installed inversely, whether the drop holes are blocked or not, whether it is necessary to steal a new part or not, whether there is enough material to be stolen or not, and whether the parts of the mold that need to be locked are locked or not. Pay attention to do a good job of stripper plate screw locking confirmation, locking should be from the inside out, balanced force cross locking, can not lock a screw and then lock another screw, so as not to cause the stripper plate tilted to lead to the convex die breakage or mold precision reduction.
(2) Maintenance of stripper plate
The stripper plate can be disassembled by prying it up with two screwdrivers in a balanced manner, and then take it out with both hands in a balanced manner. In case of disassembly difficulties, should check whether the mold is cleaned up, whether the locking screws are all removed, whether the mold should be stuck in the shadow of the damage, to find out the reasons and then deal with it accordingly, do not blindly dispose of it. When assembling the stripper plate, first clean the convex mold and stripper plate, add lubricant at the guide pillar and convex mold introduction, put it into flat, press it into place with both hands and repeat several times. If it is too tight, you should find out the reason (whether the guide column and guide sleeve are guided normally, and whether there is any breakage).