this is the type of powder metallurgy with the pressure of the air valve to improve the structure, which can extend the life of his brother. the brother of a powder metallurgical power above about.so the punch (1) of the punch (1) in the form of the valve (7) around the impact crack occurred because some may be high because of the punch (1) is easy to be damaged because of the occurrence of the change is seen. the punch (1) in the form of business. can be...the above the nose. the jaw (4) to guide the guide ball (8) and is in contact with the groove (7) in the form of crack occurrence, the power to control them and to extend the life of air emissions, not only to facilitate the task.
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