Tool and method for forging crank throw on double-action hydraulic press

Abstract

The invention discloses a tool and method for forging a crank throw on a double-action hydraulic press. The tool comprises an upper die-closing plate, a U-shaped die cavity, a platy die cavity and a lower die-closing plate. The method comprises the steps that on the double-action hydraulic press, a punch in the vertical direction is connected with a compacting die firstly, the compacting process is conducted on a blank; then the hydraulic press is adjusted back to the initial position, and the compacting die is detached and replaced with a male die; the blank is subjected to forming; and after the crank throw is formed, the equipment is started to lift up the upper die-closing die and a die-closing supporting frame, an air cylinder in the horizontal direction is started, the die is opened, and a forged piece is taken out. The characteristics of low energy consumption and high efficiency of the double-action hydraulic press are given to full play; through the designed tool, the die closing time and the die opening time are greatly shortened, and the production efficiency is improved; the tool is simple in structure, reliable in work, easy to machine and convenient to detach; and meanwhile, according to the method, it can be guaranteed that the fiber flow direction of the forged piece is not cut off, thus the forming quality of the crank throw is high, in addition, the utilization rate of the crank throw material is improved, and the production cost of the crank throw is reduced.

Description

technical field [0001] The invention relates to a process equipment and method for crank throw forming, in particular to a process equipment and method for forging crank throw on a double-acting hydraulic press Background technique [0002] The main core component of large-scale marine internal combustion engines is the crankshaft, which cannot be formed at one time like small and medium-sized crankshafts. Large-scale marine crankshafts are mainly produced by combined methods, and the difficulty of forging combined crankshafts lies in the forging of crank throws. At present, forging crank throws by double-acting hydraulic presses is a relatively advanced and efficient processing method. The crankshaft after machining not only has good rigidity and strength, but also has high dimensional accuracy and shape accuracy. At this stage, block method, ring forging method and pier forging method are mostly used in forging semi-combined large marine crankshafts. crank. The bell cran...

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Problems solved by technology

The bell crank forged by the block method has a large margin, high cost, and cuts off the metal fiber of the bell crank, so the forming quality is not high; the forging of the ring forging method is difficult to form, the forming process is complicated, and the equipment and operation technology are very high. According to the requirement, there may be air holes in the crank throw forging after forming, so the practicability is not very strong; the pier forging method requires a set of special forging die and its auxiliary equipment, which is costly and not suitable for small batch production

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