Common problems in processing precision metal stamping parts

Stamping refers to the forming and processing method of workpieces with required shape and size, including blanking, bending, drawing, forming, finishing and other processes, in which the press and die exert external forces on plates, strips, pipes and profiles to cause plastic deformation or separation. Stamping process and die, stamping equipment and stamping materials constitute the three elements of stamping processing, and only when they are combined can stamping parts be obtained. Precision metal stamping parts can be divided into various types according to industry, use and process characteristics.

1. What are the common precision metal stampings

(1) Automobile parts: mainly including automobile structural parts, automobile functional parts, automobile lathe parts, automobile relays, etc.

(2) Electronic parts: mainly including connecting devices, connectors, brushes, electrical terminals, elastic parts, etc.

(3) Household appliance parts: mainly including household appliance parts, such as color tube electron gun parts, small household appliance parts, various structural parts and functional parts.

(4) IC integrated circuit lead frame: mainly including discrete device lead frame and integrated circuit lead frame.

(5) Motor core: mainly including single-phase series excited motor core, single-phase household motor core, single-phase shaded pole motor core, permanent magnet DC motor core, industrial motor core, plastic packed stator 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 video parts, modern office parts, and daily hardware.

2. Advantages of precision stamping

(1) The stamping process has high production efficiency, convenient operation, and is easy to realize mechanization and automation. This is because stamping depends on stamping dies and stamping equipment to complete the processing. The number of strokes of ordinary presses can reach dozens of times per minute, and the high-speed pressure can reach hundreds or even thousands of times per minute. In addition, each stamping stroke may result in a stamping part.

(2) During stamping, because the die ensures the size and shape accuracy of the stamping parts, and generally does not damage the surface quality of the stamping parts, and the life of the die is generally long, the stamping quality is stable, the interchangeability is good, and the stamping is "identical".

(3) Stamping can process parts with large size range and complex shape, such as stopwatches of clocks and watches, automobile longitudinal beams, covering parts, etc. In addition to the cold deformation hardening effect of materials during stamping, the strength and stiffness of stamping are high.

(4) Stamping generally has no generation of chips, less material consumption, and does not need other heating equipment, so it is a material saving and energy-saving processing method, and the cost of stamping parts is low.

3. Common problems in precision stamping

Common problems in metal stamping include: deformation and burr of precision stamping parts; Cracks, warps, surface scratches, angular deformations, etc. of bending parts; Flange wrinkle, drawing wall wrinkling, drawing wall damage, crack, etc. of the drawing part; Flanging cracks, uneven bulging, etc.

The solution to common problems: the die design should have a reasonable clearance value between male and female dies, fillet radius and machining accuracy. When designing the bending die, effective measures should be taken to reduce the springback, and the amount of springback should be subtracted from the die; Design reasonable fillets to prevent bending cracks. When drawing, use blank holder to prevent wrinkle, and the pressure should be moderate; Use proper lubrication to reduce the drawing resistance to prevent the die from sticking or the workpiece from being pulled through; Use professional stamping oil meeting process requirements.