Pre-forming technology of high-strength aluminum alloy stock

Abstract

The invention relates to a pre-forming technology of a high-strength aluminum alloy stock, which can effectively solve the weaknesses that the internal fracture and surface coarse grain caused by adopting the free forging stretching, can reduce the pre-forming forming heating number, can improve the production efficiency, can reduce the energy consumption and can reduce the production cost. The pre-forming technology comprises the following steps: (1) feeding: the feeding length is calculated according to an equal volume conversion principle; (2) heating: rod material is heated to a forging temperature and is heat preserved; (3) stretching: the small-diameter circular part on the middle part of the stock after being heated is stretched and formed; (4) heating: the stock after being stretched is melted down and heated to the forging temperature and is heat preserved; (5) blocker-type forging upsetting: two ends of the stock are undertaken the upsetting processing through a forming die. The production method is characterized in that the stretching adopts a rolling forging stretching process.

Description

technical field [0001] The invention relates to the technical field of forging billet making, in particular to a billet making process of high-strength aluminum alloy billet. Background technique [0002] In the field of blade forgings, the "dumbbell" type blank structure is more common. The diameter of the circle at both ends of the blank is large, and the diameter of the middle circle is small. Because it is limited by the specification of the raw material bar at the same time, if the diameter of the small circle in the middle of the blank is used to select For bar specifications, the blanking length will be very long, and the ratio of upsetting height to diameter is large, which makes it difficult to realize upsetting at both ends of the billet; If the ratio is too small, the bar cannot be elongated. Therefore, under normal circumstances, the bar specification between the diameter of the large circle at both ends and the diameter of the small circle in the middle is sele...

AI Technical Summary

Problems solved by technology

[0002] In the field of blade forgings, the "dumbbell" type blank structure is more common. The diameter of the circle at both ends of the blank is large, and the diameter of the middle circle is small. Because it is limited by the specification of the raw material bar at the same time, if the diameter of the small circle in the middle of the blank is used to select For bar specifications, the blanking length will be very long, and the ratio of upsetting height to diameter is large, which makes it difficult to realize upsetting at both ends of the billet; If the ratio is too small, the bar cannot be elongated

Therefore, under normal circumstances, the bar specification between the diameter of the large circle at both ends and the diameter of the small circle in the middle is selected for production. The bar of this specification needs to go through two basic steps of upsetting and elongating to make the corresponding blank. The process can be realized. Usually, the two ends of the billet are formed by upsetting, and then the large circle in the middle is drawn to the size of the billet by free forging. However, when the bar is made of high-strength aluminum alloy, when free forging is used Due to the high deformation resistance of high-strength aluminum alloy materials during the long process, they are more sensitive to the degree of deformation and deformation speed, and are prone to defects such as internal cracks and surface coarse grains; in addition, free forging is artificial forging, which requires a long forging time and high efficiency Low, while the forging temperature window of high-strength aluminum alloy materials is narrow, and some are only 60°C, so the use of free forging for high-strength aluminum alloy materials will inevitably lead to an increase in forging times, low production efficiency, large energy consumption, and high production costs.