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The Importance of Pretreatment

Pretreatment is the key treatment process before the surface of stainless steel forgings enters the surface treatment (including pickling passivation, electropolishing and electrochemical polishing, electroplating process, passivation treatment, gray black, colorful, chemical processing, etc.). In the processing of stainless steel forgings, the surface may be stained with oil stains, burrs, and composed of non-smooth surfaces and metal oxides. Therefore, before surface treatment, it is necessary to remove oil stains, burrs, uneven surfaces and metal oxides in order to obtain satisfactory practical results for subsequent production and processing.

2. Disposal of waste to be eliminated

The waste to be eliminated during the pretreatment of the stainless steel surface can be divided into two categories: organic compounds and inorganic compounds.

(1) Organic chemical waste: This oil stain mainly comes from the smooth oil, cutting fluid, quenching fluid, polishing paste and polishing wax and finger marks applied in the whole process of adding stainless steel parts.

(2) Inorganic waste: including soil, floating dust particles, metal oxides generated during heat treatment and other wastes.

Flange forgings production process need to pay attention to what?

The forming method of flange forgings is based on the diversity of forging geometry and the machining accuracy and symmetry of forgings. At the same time, considering that the forming problem of the transmission gear forging is part of the convex blocks of the upper and lower ports, the deformation degree is above 809/6, in order to ensure the forming of each convex block, it is determined to select the closed test extrusion form for warm extrusion. Mold guide selection of positioning pins, guide pillar diagonal form setting, in order to avoid the displacement of the male and female die caused by the shape tolerance of the upper and lower bumps beyond the allowable range.

In addition, it is necessary to adopt better moistening to further ensure the success of the mold and reduce the damage of the mold to ensure the feasibility analysis and reliability of the process. According to the analysis of the forging diagram, in order to ensure the rationalization and processing accuracy of the forming of the transmission gear forging and the stability of the die work, the upper port of the forging with an aperture of 42mm can be used as the parting surface, I .e. the three bumps of the upper port are extruded at normal pressure in the die base, and the cylindrical step body and the four bumps of the lower port are formed in the cavity.

Flange forgings are usually made of carbon steel and carbon steel with various components, followed by aluminum, magnesium, copper, titanium, etc. and aluminum alloys. The original state of the raw material is round bar, casting, metal powder and shape memory alloy. The ratio of the total cross-sectional area of the metal material before deformation to the total cross-sectional area after deformation is called forging ratio. Accurate selection of forging ratio, scientific and reasonable heating environment temperature and insulation time, scientific and reasonable initial forging temperature and final forging environment temperature, scientific and reasonable shape variables and deformation rate to improve product quality, control costs have a great relationship.