Method for forging super-long hollow part from short core rod through free forging press

Abstract

The invention belongs to the technical field of forging and in particular relates to a method for forging a super-long hollow part through an oil pressing and forging machine. The method comprises the steps of heating a steel ingot, cutting and blanking through an oil press, upsetting, punching, chambering, drawing a core shaft, forging to form a finished product, annealing, roughly processing, tempering and finely processing to form the finished product. On the premise of not increasing equipment, the clamping moment problem of a free forging oil press and an operation machine can be solved by using a specific tooling and a unique forging method. According to the method disclosed by the invention, the tonnage for the free forging press to forge the steel ingot can be greatly increased; by using the method, a pipe casting die blank beyond the clamping moment of the free forging press can be successively forged; furthermore, the free forging operation machine cannot operate in overload in the forging process; and the forging capability of the equipment is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of forging, and specifically designs a method for forging an ultra-long hollow part by a hydraulic forging machine. Background technique [0002] At present, most hydraulic presses and forging manipulators in China have limited forging tonnage, and only one forging manipulator is installed on one side of the free forging press, which greatly limits the forging capacity of the equipment and the products produced. Specification. [0003] During the forging process, as the forging becomes thinner and longer, the clamping torque of the forging manipulator will also increase accordingly. Even if the weight of the forging does not exceed the rated lifting capacity of the manipulator during the production process, the overturning moment of the workpiece may exceed the manipulator. The rated clamping torque of the machine. When free forging hollow forgings, since the mandrel needs to be elongated by tooling to elo...

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Problems solved by technology

[0002] At present, most hydraulic presses and forging manipulators in China have limited forging tonnage, and only one forging manipulator is installed on one side of the free forging press, which greatly limits the forging capacity of the equipment and the products produced. Specification

[0003] During the forging process, as the forging becomes thinner and longer, the clamping torque of the forging manipulator will also increase accordingly. Even if the weight of the forging does not exceed the rated lifting capacity of the manipulator during the production process, the overturning moment of the workpiece may exceed the manipulator. Rated clamping torque of the machine

When free forging hollow forgings, since the mandrel needs to be elongated by tooling to elongate the mandrel, the forging manipulator must bear not only the weight of the forging but also the torque generated by the mandrel tooling during forging; once the rated clamping torque is exceeded , to continue production is an overload operation, and there is a great potential safety hazard

[0004] The traditional solutions are: 1. Replace the forging manipulator with greater clamping capacity. 2. Add a forging manipulator and use two-way clamping. Although these two solutions can solve the problem, the equipment investment is high and will greatly increase. Production costs, for most enterprises, this expenditure is often beyond their means

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