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русскийThe design considerations for the yoke formwork are as follows:
(1) The fitting of the yoke plate structural part and the block parts adopts the middle or light fitting method. If the strong press fit is adopted, the yoke plate will change.
(2) The yoke plate also has the function of retaining the block parts, and must have sufficient rigidity to withstand the side pressure and surface pressure of the block parts. In addition, in order to make the grooves of the yoke plate and the block parts closely combined, the corners of the grooves are processed for clearance. If the corners of the grooves of the yoke plate cannot be processed for clearance, the block parts must be processed for clearance.
(3) The division of block parts should also consider the internal shape, and the reference plane must be clarified. In order to prevent deformation during stamping, attention should also be paid to the shape of each block-shaped part.
(4) When many pieces of block parts are assembled into the yoke plate, the pitch changes due to the accumulated error of the processing of each block part. The solution is to design the middle block parts in an adjustable way.
(5) The block parts adopt the mold structure of side-by-side combination, because the block parts will be subjected to lateral pressure during punching processing, which will cause gaps between the block parts or cause the block parts to tilt. This phenomenon is an important cause of poor punching such as poor punching dimensions and clogging of punching chips, so adequate countermeasures are required.
(6) The fixing methods of the block parts in the yoke plate are as follows according to their size and shape: A. Fix with locking screws, B. Fix with keys, C. Fix with swivel keys, D. With shoulders Fix, E. The above pressing parts (such as guide plates) are pressed and fixed.
When the continuous stamping die adopts this template structure, in order to make the template have high rigidity requirements, an empty station is designed. Precautions for the construction of a built-in template are as follows:
(1) Processing of embedded holes: vertical milling machines (or jig milling machines), comprehensive processing machines, jig boring machines, jig grinders, wire-cut electrical discharge machines, etc. are used for the processing of embedded holes in the template. The machining standard for embedding holes, when using a wire-cut electric discharge machine, in order to improve its machining accuracy, two or more wire-cutting processes are performed.
(2) Fixing method of inserts: The determinants of the fixing method of inserts include the accuracy of processing, the ease of assembly and disassembly, and the possibility of adjustment. There are four ways to fix the insert: A. Fix it with screws, B. Fix it with the shoulder, C. Fix it with the toe block, D. Press the upper part with the plate. The insert fixing method of the concave template also adopts press fit. At this time, the relaxation result caused by the thermal expansion of processing should be avoided, and the rotation prevention method should be designed when using the circular die insert to process irregular holes.
(3) Considerations for the assembly and disassembly of the inserts: The machining accuracy of the inserts and their holes is required to be high for assembly operations. In order to obtain even a slight dimensional error that can be adjusted at the time of assembly, it is advisable to consider solutions in advance. The specific considerations for insert processing include the following five items: A. There is a press-in introduction part, B. The spacer is used to adjust the insert The pressed state and correct position of the parts, C. There are holes for pressing out on the bottom surface of the inserts. D. Screws of the same size should be used when locking with screws to facilitate locking and loosening. E. In order to prevent the assembly direction from changing If mistakes are made, fool-proof chamfering should be designed.
