Once hot-forging shaping process for manufacturing joint hinge

Abstract

The invention relates to the technical field of joint hinge manufacturing, in particular to a once hot-forging shaping process for manufacturing a joint hinge. The once hot-forging shaping process is characterized by adopting the following steps of: (1) adopting an intermediate frequency heating furnace to heat blanked material to 1050 to 1150 DEG C; (2) adopting a pneumatic hammer to directly and lightly upset the material heated by the intermediate frequency heating furnace to remove roll scale on the surface of the material; (3) adopting a friction press blocker to mould unfolding sheet of the joint hinge; (4) utilizing a friction press finisher provided with a V-shaped lower die to mould the unfolding sheet into the joint hinge; (5) adopting a hydraulic shape-adjuster to adjust the shape of the joint hinge; and (6) adopting a metal steel-shot to carry out shot blasting so as to lead the surface of forgeable piece to become silvery white. Compared with the prior art, the invention adopting the once hot-forging shaping process has high efficiency. The roll scale is so thin that the roll scale can be removed before forging so as to obtain excellent surface quality; and after the forgeable piece is shaped, the metal steel-shot is adopted to lead the surface of the forgeable piece to become silvery white through shot blasting so as to bring convenience for metal surface fault detection and to avoid painting treatment; and compared with the cost of flat die forging, the cost of the once hot-forging shaping process can be reduced at least by three times.

Description

[technical field] [0001] The invention relates to the technical field of suspension preparation, in particular to a one-fire forming preparation process of suspensions. [Background technique] [0002] Cranes, also known as U-shaped clamps, U-shaped chucks, and suspension clamps, are widely used in power plant boilers. Now the boilers are 70 to 80 meters high, and tens of thousands of tons of steel structures are all hoisted from top to bottom by cranes. The quality of hoisting is very important. Internationally, it is stipulated that forgings must be used for hoisting, and nondestructive testing and destructive tensile tests are required. The original boiler industry uses free forging tire film forging. Generally, small pieces are formed by five fires, and middle pieces are formed by seven fires. The problem of localization of hoists has been partially solved, but large parts cannot be made, but the process has great shortcomings, requiring five to seven fires to form, and s...

AI Technical Summary

Problems solved by technology

[0002] Cranes, also known as U-shaped clamps, U-shaped chucks, and suspension clamps, are widely used in power plant boilers. Now the boilers are 70 to 80 meters high, and tens of thousands of tons of steel structures are all hoisted from top to bottom by cranes. The quality of hoisting is very important. Internationally, it is stipulated that forgings must be used for hoisting, and nondestructive testing and destructive tensile tests are required. The original boiler industry uses free forging tire film forging. Generally, small pieces are formed by five fires, and middle pieces are formed by seven fires. The problem of localization of hoists has been partially solved, but large parts cannot be made, but the process has great shortcomings, requiring five to seven fires to form, and seven fires larger than 20 kg, so the manufacturing cost is high and the efficiency is low. The shift can only produce 4-10 pieces, and the heating times are too many. The general process stipulates heating to 950°C-1050°C, and the final forging temperature is greater than 850°C, which will cause decarburization and other elements loss and affect the quality; in addition, forgings only have the first fire It is possible to remove the oxide skin, but the last six fires cannot remove it, resulting in the product being in the fetal membrane, the oxide skin is forged in the product, and the surface quality is extremely poor; and the free forging cannot be thrown because the oxide skin is caught in the product. As soon as the shot blasting surface defect is exposed, the deepest depression can reach about 4mm, which seriously affects the quality and requires painting treatment; due to five to seven fire molding, it is difficult to control the temperature evenly each time, so it will cause two feet, front and rear, high and low Inconsistency, even if the tolerance given by the drawing design is very large, the repair rate and scrap rate are still high

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