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一、问题的提出金属冷挤压时,如为上下分模,一般下模存放坯料,上模将坏料挤入型腔成为零件,在未接触坯料之前,上模以一定速度移动,而坯料速度为零。因此开始挤压的瞬时,两者速度不同而出现冲击和振动。冲击力的大小决定于接触时的相对速度,而机械式冷挤压机的接触速度较高,故冲击力较大,机床和模具承受的冲击载荷也就较大。据有关资料介绍,采用缓冲装置后,模具寿命可提高50～200％作者认为对缓冲装置的要求应该是:
First, the problem raised metal cold extrusion, such as the upper and lower parting mode, the general die storage billet, the die will be bad material into the cavity into a part, before not touching the billet, the die to a certain speed, while the billet Speed is zero. Therefore, the moment of starting squeeze, both the impact of different speeds and vibration. Impact depends on the size of the relative speed of contact, and mechanical cold extrusion of the contact speed is high, so the impact of large, machine tool and die to withstand the impact load is larger. According to the information introduced, the use of buffer device, the mold life can be increased by 50 ~ 200% The author believes that the requirements of the buffer device should be: