Roll flange is a kind of bar which is forged by open roll flange and continuously deformed along its length direction. It is usually used to process a piece of raw material to a suitable thickness. Once the appropriate thickness reaches the appropriate width, it can be achieved gradually.
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The progressive concentration of the process material uses a concave shape to open the mold. This process is called edge machining because rolling flanges are usually performed at both ends of the workpiece. Shimming is a similar process, in which the parts are thinned by convex die forging. These workpieces are further rolled and flanged in preparation for the forging process. In this process, there are some disadvantages, most of which are due to the workpiece contacting with the mold for a period of time. The number and length of steps is a time-consuming process.
Because the contact between the die and the workpiece and the heat transfer effect of the die are much greater than that of the surrounding environment, the cooling speed of the flange after rolling is faster. When the workpiece is cooled, the rolling flange becomes stronger and the toughness is worse. If the deformation continues, it may lead to cracking. As a result, heating dies are often used to reduce heat loss, promote surface flow, and develop production details and tolerances.
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