What is stainless steel flange?
Stainless steel flanges are a type of stamping process. On the flat or curved portion of the blank, the forming method of forming a straight wall or flange at an angle along the curved or closed edge of the curved portion by the action of the mold is referred to as a stainless steel flange.
Stainless steel flanges are also a type of steel butt welded pipe fittings, usually a section of the loose flange.
There are many types of flanging, and the classification methods are not the same. Among them, the deformation property can be divided into an extended flange and a compression flange.
The main factors affecting the limit flanging coefficient are:
Plasticity of materials
The greater the elongation, strain hardening index and anisotropy coefficient of the material, the smaller the limit flanging coefficient is, which is beneficial to the flanging.
Hole processing method
The processing method of the pre-formed hole determines the edge condition of the hole, and when the edge of the hole is free from defects such as burrs, tears, hardened layers, etc., the limit flanging coefficient is smaller, which is favorable for flanging. At present, the prefabricated holes are mainly processed by punching or drilling, and the data shows that the drilling is smaller than the min of the general punching. The conventional punching method has high production efficiency, and is particularly suitable for processing large holes, but defects such as hardened layer, burr, tear, etc. on the surface of the orifice are formed, and the limit flanging coefficient becomes large. After the punching is performed, the heat treatment is annealed, the hole is repaired, or the burr is placed in the opposite direction to the punching direction so that the burr is located inside the turning hole, and a lower limit flanging coefficient can be obtained. A lower limit flange factor can also be obtained by deburring after drilling, but the production efficiency is lower.
Prefabricated hole / flange
The smaller the relative diameter/presence of the preformed hole, the smaller the limit flanging coefficient, which is advantageous for flanging. This is because the same pre-made aperture, the greater the thickness of the material, the allowable absolute value of the thickness direction pressure, according to the law of volume invariance, so the limit tangential strain value at the edge of the deformation zone when the flange is to be cracked increases. It can be seen that the limit flanging coefficient is smaller.
The limit flange factor of a spherical punch is smaller than that of a flat-bottom punch. In addition, the convex shape of the paraboloid, the tapered surface and the larger fillet radius is also smaller than the limit flanging coefficient of the flat-bottomed punch. Because the spherical or tapered punch is the first contact of the front end of the punch with the pre-formed hole when the flange is deformed, the bending deformation in the die area is smaller than that of the flat-bottom punch, and it is easier to cause plastic deformation of the hole. . Therefore, when the same flanged aperture D and material thickness t are used, the pre-formed aperture that can be flanged is smaller, and thus the limit flange factor is smaller.
Manufacturing standards for flanging: MSSSP-43, ASMEB16.9, GB/T12459 and other standards. Materials are carbon steel, stainless steel, alloy steel, etc.