Design principles of hardware stamping parts

The designed hardware stamping parts must meet the product's usage and technical performance, and be easy to assemble and repair.

2023-03-29

Application field of hardware stamping parts

(1) Stamping in the automotive industry. Mainly focused on deep drawing. In this part of our country, it is mainly concentrated in large factories such as automobile factories, tractor factories, and aircraft manufacturing factories, and independent large-scale stamping and deep drawing factories are still rare. (2) Stamping for automotive and other industry components. Mainly formed by punching and shearing. Many of the enterprises in this department are located in standard parts factories, as well as some independent stamping factories. Currently, there are many such small factories near some automobile or tractor factories. (3) Electrical parts stamping factory. This type of factory is a new industry that has developed with the development of electrical appliances, with factories mainly concentrated in the south. (4) Daily necessities stamping factory. Making some handicrafts, tableware, etc., these factories have also made significant development in recent years. (5) Home appliance component stamping factory. These factories only emerged after the development of household appliances in China, with most of them distributed within household appliance enterprises. (6) Special stamping enterprises. Enterprises such as stamping of aviation parts belong to this category, but these process factories are also included in some large factories.

2023-03-29

Main characteristics of stamping parts

Stamped parts are mainly formed by stamping metal or non-metallic sheets with the pressure of a press and forming them through stamping molds. They mainly have the following characteristics: Stamped parts are manufactured by stamping with minimal material consumption. Their parts are lightweight and have good stiffness. After plastic deformation of the sheet metal, the internal structure of the metal is improved, resulting in an increase in the strength of the stamped parts. ⑵ Stamped parts have high dimensional accuracy, uniform and consistent dimensions with the same module, and good interchangeability. No further mechanical processing is required to meet general assembly and usage requirements. During the stamping process, stamped parts have good surface quality and a smooth and beautiful appearance due to their undamaged surface, which provides convenient conditions for surface painting, electroplating, phosphating, and other surface treatments.

2023-03-29

Inspection methods for stamped parts

Wipe the surface of the outer cover with clean gauze. The inspector needs to wear touch gloves to touch the surface of the stamped part longitudinally, and this inspection method depends on the inspector's experience. If necessary, oil stones can be used to polish and verify the suspicious areas that have been detected, but this method is an effective and fast inspection method.

2023-03-29

Flipping and twisting of stamping parts

In a progressive die, the shape of the stamping part is formed by punching and cutting the remaining material around the stamping part. The main reason for flipping and twisting of punched parts is the influence of punching force. During punching, due to the existence of punching gaps, the material is stretched on one side of the concave mold (material warps upwards) and compressed on the side next to the convex mold. When using a discharge plate, use the discharge plate to compress the material to prevent the material on the concave mold side from warping upwards. At this time, the stress state of the material will change accordingly. As the unloading plate increases its pressing force, the material on the convex die side is stretched (the compression force tends to decrease), while the material on the concave die surface is compressed (the stretching force tends to decrease). The flipping of stamping parts is caused by the stretching of the material on the concave die surface. So when punching, pressing and compressing the material is the key to preventing flipping and twisting of the punched part.

2023-03-29

Dimensional tolerance of stamped parts

The GB/T13914-2002 Dimensional Tolerances for Stamped Parts specifies the dimensional tolerances for stamped parts. Dimensional tolerances are specified separately for flat stamped parts and formed stamped parts. The dimensional tolerance value of stamping parts is related to the dimensions of stamping parts and plate thickness, and on the other hand, it is related to the accuracy level. Dimensional tolerance of flat stamped parts: divided into 11 levels, represented by ST1 to ST11, where ST represents the dimensional tolerance of flat stamped parts, and the tolerance level code is represented by Arabic numerals. The accuracy level decreases sequentially from ST1 to ST11. Dimensional tolerance of formed stamping parts: Formed stamping parts are divided into 10 accuracy levels, represented by FT1 to FT10, where FT represents the dimensional tolerance of formed stamping parts and Arabic numerals represent the tolerance level. The accuracy level decreases sequentially from FT1 to FT10. Limit deviation of stamping parts: the hole size is 0 when pressed down, and the upper deviation is the lower deviation plus dimensional tolerance; The upper deviation of the shaft size is the basic deviation, with a value of 0, and the lower deviation is the upper deviation minus the dimensional tolerance. The upper and lower deviations of hole center distance, hole edge distance, bending, drawing length, height, etc. are specified as half of the dimensional tolerance.

2023-03-29