Stamping processing flow:

1. Determine the amount of deformation compensation according to the material, product structure, etc.

2. According to the compensation amount, the die is designed to punch out finished semi-finished products.

3. Process semi-finished products to finished products.

4. Unfavorable phenomena include cracks, wrinkles, strains, uneven thickness, non-forming, etc.

Tapping thread processing:

1. The internal thread first drills the bottom hole diameter depth (the bottom hole size is determined according to the thread specification); the external thread is first processed to the outer circle to the large diameter of the thread (the size is determined according to the thread specification).

2. Thread processing: internal thread tapping with corresponding grade tap; external thread turning with thread cutter die sleeve threading.

3. Unfavorable phenomena include random threads, non-uniform dimensions, unqualified thread gauge inspection, etc.

Attachment: The materials are mainly selected copper, aluminum, low carbon steel other metals non-metals with low deformation resistance, good plasticity good ductility according to the requirements of use.

Stamping parts are formed by applying external force to plates, strips, pipes profiles by presses molds to cause plastic deformation separation to obtain workpieces (stamping parts) of the required shape size. Stamping forging are both plastic processing ( pressure processing), collectively known as forging. The stamped blanks are mainly hot-rolled cold-rolled steel plates strips.

Stamping parts are mainly formed by stamping metal non-metal sheet materials with the pressure of a press through a stamping die. It has the following characteristics:

①Stamping parts are manufactured by stamping under the premise of low material consumption. The parts are light in weight rigid. After the sheet material is plastically deformed, the internal structure of the metal is improved, which improves the strength of the stamping parts. .

②Stamping parts have high dimensional accuracy, the same size as the mold parts, good interchangeability. It can meet general assembly use requirements without further machining.

③In the stamping process, because the surface of the material is damaged, the stamping parts have a good surface quality a smooth beautiful appearance, which provides convenient conditions for surface painting, electroplating, phosphating other surface treatments.

Stamping is a production technology that uses the power of conventional special stamping equipment to directly subject the sheet to the deformation force deform in the mold, thereby obtaining product parts with a certain shape, size performance. Sheet material, mold equipment are the three elements of stamping processing. Stamping is a method of metal cold deformation processing. Therefore, it is called cold stamping sheet metal stamping, stamping for short. It is one of the main methods of metal plastic processing ( pressure processing), it also belongs to material forming engineering technology.

Treatment method before phosphating:

①After phosphating parts are pre-treated, the surface should only remove oil stains oxide films, but also prevent excessive exposure of the crystal lattice, that is, the surface activity of the parts should be too high, which is the pre-treatment requirement of phosphating;

② conditions permit, organic solvent degreasing sandblasting can be used to remove oxide scales on medium high-carbon steel parts. The resulting phosphating film is fine dense, there is less hydrogen evolution during the phosphating process, the phosphating speed is fast. High film corrosion resistance;

③For the phosphating parts before painting, most of them are low-carbon steel stamping parts, which are suitable for organic solvent degreasing, require thin phosphating film, fine crystals, strong rust resistance. Therefore, when selecting the pre-treatment process, for the situation there are too many parts no serious corrosion, the rust removal process can be omitted, only the degreasing process of weak alkaline surfactant is used. After degreasing, it is directly adjusted phosphated;

④For alloy steel other parts, because there is no oxide scale on the machined surface, only machining oil is used to wipe the surface of the part, directly phosphatize it without acid etching;

⑤For the remaining mass-produced parts, most of them now use a weakly alkaline, medium temperature, degreasing solution containing surfactants. After washing with water, the oxide film is removed by acid salt etching solution (this kind of corrosion solution is composed of a certain amount of The free acid the salt composed of the same anion are mixed to form an etching solution. Under the same ion effect, the amount of H+ ionization is small, but it is continuous can maintain a certain amount of H+ content), so this acid etching solution is strong , But it lasts for a long time is effective in removing the oxide film, but there is no large erosion to the base metal. The surface of the parts treated in this way can remove oil stains oxide film without causing too much corrosion on the surface of the base metal. That is, the activity of the metal surface is too high after pre-treatment, then after surface adjustment phosphating, a fine dense phosphating film can be obtained, the film weight is small, the anti-corrosion ability also meets the requirements.