Stamping is the forming and processing method of applying external force to plate, strip, pipe and profile by press and die to produce plastic deformation or separation, so as to obtain the workpiece with required shape and size, including blanking, bending, deep drawing, forming, finishing and other processes. Stamping process and die, stamping equipment and stamping materials constitute the three elements of stamping processing. Only when they are combined with each other can stamping parts be obtained. With the development of hardware products industry, the production equipment and technology of metal stamping parts are constantly improved, and the metal stamping parts are becoming more and more precise. Precision metal stamping parts can be divided into many types according to industry, purpose and process characteristics.
1. Auto parts: mainly including auto structural parts, auto functional parts, auto lathe parts, auto relays, etc.
2. Electronic parts: mainly including connecting devices, connectors, brush parts, electrical terminals, elastic parts, etc.
3. Household electrical appliance parts: mainly including household electrical appliance parts, such as color tube, electron gun parts, small household electrical appliance parts, various structural parts and functional parts, etc.
4. IC lead frame: it mainly includes discrete device lead frame and integrated circuit lead frame.
5. Motor iron core: it mainly includes single-phase series excitation motor iron core, single-phase household motor iron core, single-phase shaded pole motor iron core, permanent magnet DC motor iron core, industrial motor iron core, plastic encapsulated stator iron core, etc.
6. Electrical iron core: mainly including E-shaped transformer iron core, EI shaped transformer iron core, I-shaped transformer iron core, and other transformer iron chips.
7. Heat exchanger fins: mainly including industrial heat exchanger fins, household heat exchanger fins, automobile heat exchanger fins, etc.
8. Other parts: mainly including instrument parts, it parts, acoustic and camera parts, modern office parts, daily hardware, etc.
1. Stamping processing has high production efficiency, convenient operation and easy to realize mechanization and automation. This is because stamping depends on stamping dies and stamping equipment to complete the processing. The stroke times of ordinary press can reach dozens of times per minute, and the high-speed pressure can reach hundreds or even thousands of times per minute, and each stamping stroke may get a stamping part.
As like as two peas, 2, stamping die ensures the size and shape accuracy of stamping parts, and generally does not destroy the surface quality of stamping parts, and the life of dies is generally longer. So stamping quality is stable, interchangeability is good, and has the characteristics of "exactly the same".
3. Stamping can process parts with large size range and complex shape, such as stopwatch of clocks and watches, automobile longitudinal beam and covering parts. Combined with the cold deformation hardening effect of materials during stamping, the strength and stiffness of stamping are high.
4. Stamping generally has no chip and scrap generation, less material consumption, and does not need other heating equipment. Therefore, it is a material-saving and energy-saving processing method, and the cost of stamping parts is low.
Common problems in metal stamping include: deformation and burr of precision stamping parts; Crack, warpage, surface scratch, angular deformation, etc. of bending parts; Flange wrinkle, drawing wall wrinkle, drawing wall damage, drawing crack, etc. of drawing parts; Flanging crack, uneven bulging, etc.
Solutions to common problems: die design should have reasonable punch and die clearance, fillet radius and machining accuracy. When designing the bending die, effective measures should be taken to reduce the springback and subtract the springback from the die; Design reasonable fillet to prevent bending crack. Blank holder ring shall be used to prevent wrinkling during deep drawing, and the pressure shall be moderate; Reduce the drawing resistance with proper lubrication to prevent the die from sticking or the workpiece from being pulled through; Use professional stamping oil that meets the process requirements.
The above content is about the classification and processing of precision metal stamping parts. Reasonable process arrangement can effectively improve the processing efficiency and reduce the production cost.