Forging and pressing punch head overload protection device and forging and pressing device with same

Abstract

The invention discloses a forging and pressing punch head overload protection device and a forging and pressing device with the same. The forging and pressing punch head overload protection device is connected with the forging and pressing device, wherein fluid pressure inside a fluid pressure cavity is controlled to be within a set load value range by utilizing the forging and pressing punch head overload protection device, and a punch head is actuated to forge and press blanks arranged in a mould cavity by dint of the fluid pressure. Thus, the forging and pressing punch head overload protection device disclosed by the invention has the following advantages of preventing the punch head from bearing overloads in a forging and pressing process flow so as to protect the punch head, enablingthe optimal forging and pressing pressure to be added to the blanks in the forging and pressing process flow, enhancing the mass production in the forging and pressing process flow, preventing the frequent machine halt, lowering the requirements for tolerance during mould design and manufacture and reducing the mould cost.

Description

technical field [0001] The invention relates to an overload protection device and a forging device with the overload protection device, in particular to an overload protection device for a forging punch and a forging device with the overload protection device for a forging punch. Background technique [0002] In the existing forging process, such as the micro-forging forming process, there will be a size effect, especially in the micro-closed forging process, the size effect is more serious. Among them, when the volume of the forged billet is in the fine size, the processing tolerance is larger than the general size. This is called the size effect of the fine tolerance. In addition, the size of the micro-punch itself is quite small, and it is easily affected by the volume tolerance of the billet during the closed forging process, causing the punch to bear excessive load and cause damage. [0003] Referring to China Taiwan Patent Publication No. 476702, it discloses an overl...

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Problems solved by technology

[0007] However, the existing overload protection devices of the above-mentioned two patents are all used for the slider protection of the stamping bed, and their volume is relatively large, so they cannot be applied to the fine forging process or the micro-closed forging process under the fine size

Moreover, under normal circumstances, the strength of the punch in the mold is much lower than the strength of the slider protection. Taking the closed forging process as an example, if the punch breaks, it will increase the mold manufacturing cost and reduce the utilization rate.

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