Pull-down hydraulic device for blocking die

Abstract

The invention discloses a pull-down hydraulic device for a blocking die. The pull-down hydraulic device comprises an upper main oil cylinder, an upper sliding cross beam, a punch, an upper slide block, an upper female die, a lower female die, a working table, a pull-down oil cylinder and a pull-down slide block, which are arranged from top to bottom in sequence, and a pull rod, wherein the pull-down slide block is connected with a piston end surface of the pull-down oil cylinder, the pull rod passes through the working table vertically, the top end of the pull rod is fixed with the upper slide block, the bottom end of the pull rod is fixed with the pull-down slide block, the upper female die is fixed at the bottom of the upper slide block, and the lower end of the punch is corresponding to the central holes of upper slide block and the upper female die. Enormous die assembly force is provided by the pull-down oil cylinder, the upper main oil cylinder only provides a forging and stamping force for extruding blanks, a die cavity is filled through extrusion to obtain a flash-free precise forging part of which the shape and the size are identical to those of the die cavity, and compared with a conventional device, the pull-down hydraulic device is small in size, low in power consumption, and low in production cost.

Description

technical field [0001] The invention relates to a block forging device, in particular to a block die pull-down hydraulic device. Background technique [0002] Block forging is a contemporary advanced precision forging technology. Block forging is also called block extrusion. Its principle is to close two or more separable dies with a large enough clamping force to form a closed cavity. Under the opposite motion, the die cavity is filled by extrusion, so as to obtain a fine forging with no flash and near net size that is exactly the same shape and size as the die cavity. [0003] In the prior art, the lower punch is fixed on the workbench, and the lower die is placed on a group of strong springs. Put the blank in the lower die, when the slider of the press drives the upper die down, the upper and lower dies are closed under the action of the strong spring. The slider overcomes the resistance of the spring and continues to descend, causing the punch to move relative to the ...

AI Technical Summary

Problems solved by technology

[0009] The above several blocking mechanisms have their own characteristics, but there are deficiencies. Whether springs, butterfly springs, polyurethane rubber, hydraulic pressure, or high-pressure air are used to drive the lower die, the main cylinder first needs to provide downward force to offset this part of the upward drive. The force of the lower die is used to provide the mold clamping force, as well as the force of the punch to punch the metal blank, and the mold clamping force is provided during the extrusion process, so the main cylinder is required to provide a large force, and the strength of the entire device is required to be very high. , the volume is also very large, the production cost is very high, and it is impossible to make the closed forging truly form industrialized production

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