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Cold formers, which mold raw materials without heat, are utilized for parts production including connecting rod bolts, constant-velocity ball joints, etc. Parts that are essential to modern society, such as parts used in cars and architectural TC bolts, are also produced.
Since this forging process is performed at close to room temperature, the raw material can easily be deformed without much resistance.
When the raw material hardens and deforms, excessive stress may be placed on the tools, causing damage. Therefore, there is a limit to the size and shape that can be processed. Net shaping (also known as precision forming) is possible without post-finishing, making dimensional accuracy and good surface conditions achievable.
Hot formers heat raw materials to 1000-1250 degrees Celsius before the molding process can take place. In order to forge, raw material is heated to a temperature range exceeding the recrystallization temperature. Opposition to transformation lessens, and the ability to transform increases. Therefore, large products can be processed. Compared with cold forging, hot forging is inferior in dimensional precision and surface conditions. Bearing races and forging of large gear blanks (that cannot be done in cold heading) are used.

We have performed rotary rolling work which includes the rolling of screws, grooves, diamond serration, and marking. Precision and high speed production are the greatest features of Sakamura’s rotary rolling, and unmanned production has been achieved by this line through the magic of formers and liners.
Please refer to the menu on the left for more details on each series.