Die processing refers to the processing of forming and blank making tools, including die cutting die and shearing die. Generally, the mold consists of an upper mold and a lower mold. The material is formed under the action of a press, and the steel plate is placed between the upper mold and the lower mold. When the press is opened, the workpiece determined by the mold shape will be obtained or the corresponding scrap will be removed. Parts as large as automobile instrument panel and as small as electronic connector can be molded by mold. Progressive die refers to a set of dies that can automatically move the processed workpiece from one station to another, and obtain the formed part in the latter station. Die processing technology includes: four slider die, extrusion die, compound die, blanking die, progressive die, stamping die, die cutting die, etc.
Basic characteristics of mold processing: 1. High processing precision. A pair of molds usually consists of a female mold, a male mold and a mold frame, some of which can be multi piece segmentation modules. Therefore, the combination of upper and lower dies, the combination of inserts and cavities, and the combination between modules all require high machining accuracy. 2. Complex shape and surface. For some products, such as automobile panels, aircraft parts, toys and household appliances, the molding surface is composed of various curved surfaces, so the mold cavity surface is very complex. Some surfaces need to be treated by mathematical calculation. 3. Small batch. Mold production is not batch production, and in many cases only one pair is produced. 4. There are many processes. Milling, boring, drilling, reaming and tapping are always used for mold processing. 5. Repeat production. The service life of the die is long. When the service life of a pair of dies exceeds their service life, new dies need to be replaced, so the production of dies is often repeated. 6. Profiling processing. Mold production sometimes has neither drawings nor data, and copying and processing should be carried out according to the actual object. This requires high imitation accuracy and no deformation.
Mold processing flow: 1. Bottom processing, processing quantity guarantee; 2. Slab datum alignment, check 2D allowance and 3D profile; 3. Rough machining of 2D and 3D profiles, non installation and non work plane machining; 4. Before semi finishing, align the side datum plane to ensure accuracy; 5. Semi finish machining of 3D contour and 2D, semi finish machining of various guide surfaces and guide holes, finish machining of various installation working surfaces, allowance for finishing of process reference holes and height reference surfaces, and recording of data; 6. Check and recheck the machining accuracy; 7. Bench worker inlaying process; Align the datum plane of the process datum hole and check the allowance of the insert before finishing; 8、. Finish machining contour 2D and 3D, punching contour and hole position, finish machining guide surface and guide hole, finish machining process datum hole and height datum; 9. Check and recheck the machining accuracy.
Notes: 1. The process is concise and detailed, and the processing content should be expressed in figures as much as possible; 2. Special emphasis shall be placed on the key points and difficulties of processing; 3. It is necessary to combine the processed parts and express the process clearly; 4. When the insert needs to be processed separately, pay attention to the technical requirements for processing accuracy; 5. After combined processing, for inserts that need to be processed separately, the benchmark requirements for independent processing shall be installed during combined processing; 6. The spring is easy to be damaged in die processing, so the die spring with long fatigue life should be selected.
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