The forging process of stainless steel flanges includes key steps such as material selection and cutting, heating, free forging or die forging, post forging cooling and heat treatment, mechanical processing and inspection. The following are specific instructions:

1、 Material selection and cutting

The first step in forging stainless steel flanges is to select high-quality steel billets as raw materials. These steel billets need to undergo strict inspection to ensure that their chemical composition and mechanical properties meet the forging requirements. When cutting, it is necessary to accurately cut the steel billet according to the design specifications of the flange to control the loss and cost of subsequent processing.

2、 Heating up

Send the cut steel billet into a heating furnace and heat it to a suitable temperature range (usually around 1200 ℃). The purpose of heating is to achieve a good plastic state of the steel billet, which facilitates subsequent forging processing. During the heating process, it is necessary to strictly control the temperature and time to avoid overheating or overburning, so as not to affect the quality and performance of the steel billet.

3、 Forging Forming

Forging forming is the core process of stainless steel flange forging, mainly including two methods: free forging and die forging:

1. Free forging:

Characteristics: Low productivity, large machining allowance, but simple tools, high universality, suitable for forging single piece and small batch production of forgings with simple shapes.

Equipment: air hammer, steam air hammer, hydraulic press, etc., suitable for the production of small, medium, and large forgings respectively.

Basic processes: including upsetting, stretching, punching, bending, twisting, and cutting. Upsetting is the process of forging the raw material along the axial direction to reduce its height and increase its cross-section. It is commonly used for forging gear blanks and other disc-shaped forgings; Pulling is a forging process that increases the length and reduces the cross-section of the billet, usually used to produce shaft blanks; Punching is a forging process in which a punch is used to punch through or through holes in a billet; Bending, twisting, and cutting are respectively used to bend the billet into a certain angle or shape, rotate one part of the billet relative to another by a certain angle, and divide the billet or cut off the material head.

2. Forging:

Features: High productivity, simple operation, easy to achieve mechanization and automation. The dimensional accuracy of forged parts is high, the machining allowance is small, and the fiber structure distribution of forged parts is more reasonable, which can further improve the service life of the parts.

Equipment: forging hammer, hot forging press, flat forging machine, friction press, etc.

Basic processes: including cutting, heating, pre forging, final forging, punching and skinning, trimming, quenching and tempering, and shot blasting. Common processes include upsetting, stretching, bending, punching, and forming.

4、 Cooling and heat treatment after forging

After forging, the flange needs to undergo appropriate cooling treatment to eliminate internal stress and structural defects generated during the forging process. The cooling method is usually air cooling or furnace cooling, depending on the material and size of the flange. Subsequently, heat treatment (such as quenching and tempering) may be required to further improve the mechanical properties and corrosion resistance of the flange.

5、 Mechanical processing and inspection

The flange after cooling and heat treatment needs to be machined to achieve the required dimensional accuracy and surface quality in the design. During the machining process, it is necessary to strictly control the machining parameters to avoid excessive cutting forces and thermal deformation. Finally, strict inspections are conducted on the processed flanges, including dimensional checks, visual inspections, and non-destructive testing, to ensure that their quality meets relevant standards and requirements.