Forging method for six-throw crankshaft

Abstract

The invention relates to a forging method for a six-throw crankshaft. The method comprises the following steps of: a), after upsetting a forge piece, drawing the forge piece to be flat and square, stamping the top and the bottom of the forge piece by using a triangular knife according to the number of the sections of the six-throw crankshaft needing to be forged, and stamping the forge piece into the same sections as the six-throw crankshaft; b), drawing the longer section of the six-throw crankshaft by using a short anvil according to the length of the six-throw crankshaft needing to be forged, and then integrally drawing the overall forge piece to a required size; c), twisting a corresponding section of the drawn forge piece to obtain a blank of the six-throw crankshaft needing to be forged; and d), performing precision-forging finishing on the blank of the six-throw crankshaft to obtain the six-throw crankshaft needing to be forged. The method is suitable for forging the six-throw crankshaft.

Description

technical field [0001] The invention relates to a forging method of a six-turn crankshaft. Background technique [0002] The structure of the six-turn crankshaft is as follows: figure 1 , figure 2 As shown, it consists of several sections, the crankshaft is 120°, and the included angle is evenly distributed. Large multi-turn crankshafts are mainly used in large engines. Its main function is to convert the force transmitted from the connecting rod into torque. It is the core part of the engine and is widely used in engines in large machinery, chemical industry, locomotives, ships and other industries. Its forging methods include fully assembled, semi-assembled and integral forging methods. Due to the integration of the crankshaft and the curved diameter and the continuous forging fibers, the overall forging is difficult and the quality of the forgings is high, so the forging is difficult, the shape is complex during the forging process, and quality problems are easy to o...

AI Technical Summary

Problems solved by technology

Due to the integration of the crankshaft and the curved diameter and the continuous forging fibers, the overall forging is difficult and the quality of the forgings is high, so the forging is difficult, the shape is complex during the forging process, and quality problems are easy to occur (such as folding 120 ° included angle offset, etc.)

At present, when the overall forging of multi-turn crankshafts is carried out in China, misalignment and angle presets are adopted. Most of the crankshafts are forged from a circle to a hexagon or from an octagon to a hexagon. The forging process requires many fires, the deformation process is complicated, and the pass rate is low.

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