The round or square recesses are processed in the templ […]
The round or square recesses are processed in the template, and the block parts are embedded in the template. This template is called an inlay structure. This structure has less accumulated tolerances for processing, high rigidity, and accuracy and reproducibility during disassembly and assembly. good. Due to the advantages of easy machining, machining accuracy determined by the working machine, and fewer final adjustments, the built-in template structure has become the mainstream of precision stamping dies, but its disadvantage is that it requires a high-precision hole processing machine.
When the continuous stamping die uses this template structure, in order to make the template have high rigidity requirements, an empty station is designed.
The precautions for the construction of the built-in template are as follows:
(1) Processing of embedded holes: Vertical milling machines (or fixture milling machines), integrated processing machines, fixture boring machines, fixture grinders, wire-cut electrical discharge machines, etc. are used to process the embedded holes of the template. The machining standard for inserting 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 are the accuracy of processing, the ease of assembly and disassembly, the possibility of adjustment, etc. There are four ways to fix the inserts: A. Fix with screws, B. Fix with shoulders, C. Fix with toes, and D. Fix the upper part with plates. The method of fixing the inserts of the concave template also adopts press-fitting. At this time, the slack effect caused by the processing thermal expansion should be avoided. When using the round mold inserts to process irregular holes, the rotation prevention method should be designed.
(3) Considerations for assembly and disassembly of inserts: The processing precision of inserts and their holes is required to be high for assembly operations. In order to obtain that even a slight dimensional error can be adjusted during assembly, it is advisable to consider the countermeasures in advance. The specific considerations for insert processing include the following five items: A. with a press-in lead-in part, B. adjust the insert with spacers The press-in state and the correct position of the piece, C. The bottom surface of the insert is provided with a hole for pressing out. D. Screws of the same size should be used when tightening with screws to facilitate locking and loosening. E. To prevent the direction of assembly Mistakes should be designed for fool-proof chamfering.