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Die for forging, forging formation item production method and that forging formation item
Die for forging, forging formation item production method and that forging formation item
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机译：锻造模具，锻造成型品的制造方法以及锻造成型品
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摘要
When forming the formation borehole of the forging die (35) the aforementioned breathing passage to have the plural step sections where the cross-sectional area of gases style directions and vertical direction differs the breathing passage in order to discharge the gas which is shut in (34) the die for forging which it possesses (30) in, the 1st step section which faces to the aforementioned formation hole wall surface (X) the 2nd step section which the opening phase product connects to this (Y) to be smaller than the opening phase product, at the same time, because it is provided in the wall surface where the open part consists of the type divided section or the wall surface which consists of one somatotype section, in the breathing passageThe material for forging which penetrated breaking at the time of product discharge, there are no times which the next forging time are pushed up to the next step by the pressure of the gas, can be filled the breathing passage. Therefore, complicated die form being, it lets escape the gas which is shut in the formation borehole smoothly, it is possible to produce the satisfactory forging formation item of the size precision which held down the occurrence of the underfill.
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