What is the cause of tearing during flanging of stamping parts
The flanging in metal stamping processing is a stamping process in which the hole edge or outer edge of the workpiece is turned into a vertical straight edge by using a die. In the production of this stamping process, sometimes it will be accompanied by the skew of the stamping hole, and even tear. The tearing parts of flanging stamping parts are mainly distributed at the pass of the part, the junction of R arc and wall neck at the corner of the side wall, etc. due to the difference of stamping forming and production process conditions, the proportion of each fracture part is different. The tear can be a one-time forming tear or a tear caused by the development of fatigue crack, i.e. invisible crack. What is the reason for this? How do stamping parts manufacturers correct and improve?
The implementation of forming process parameters is not in place
In the forming process of stamping parts, the process requires that the die, pressing core and their parts must be closely bonded together to press the plastic deformation of sheet metal when the sliding block of the machine tool slides. But now, because the quality of the pressed parts is unstable, it shows that the pressure of the machine tool is in an unbalanced state of pressure jump in the production process. The main reason is that the stamping operators did not adjust the machine tool pressure in time at this stage according to the process specified requirements, or did not communicate the machine tool pressure stability information with each other during the handover of each shift, resulting in the unstable quality of parts.
Design defects of flanging forming die
Since the first mock exam is a double cavity left/right part, the process is not only flanging but also with shape forming content, and the parts are very complicated, and the bending surface is narrow. Forming requires the die to match the forming face, which results in the large forming stroke and small pressing area. In the initial die design, the designer only considered the characteristic of small pressing surface, but ignored the sliding guide stroke of pressing core forming.
Source: Network Arrangement – China Stub Ends Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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