Large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process
A forming process and thick-walled tube technology, which is applied in the deformation processing of magnesium alloys, forging and ring rolling deformation of Mg-Al-Ag series magnesium alloys, and can solve the problems of fast heat dissipation, narrow thermal deformation temperature range, and difficulty in blank preparation, etc. question
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Embodiment 1
[0023] Example 1: Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) magnesium alloy ingots with a diameter of Ф530mm were cast by semi-continuous casting using a large furnace to melt raw materials. The cast ingot is processed by mechanical turning, cutting, and chamfering in turn, and finally an ingot with a diameter of Ф480mm and a length of 700mm is processed, such as figure 1 shown. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. The ingot is heated to 410°C for 10 hours, and the ingot is subjected to upsetting and drawing multi-directional forging on a hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-40% for upsetting passes, and a reduction of 30-40% for elongation passes. Amount of 5-10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the ingot is low...
Embodiment 2
[0024] Example 2: First, the alloy raw material is melted in a large furnace, and then a Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.02Ca (wt.%) alloy ingot with a diameter of Ф550mm is cast by semi-continuous casting. The cast ingot is processed by mechanical turning, cutting and chamfering in turn, and finally an ingot with a diameter of Ф500mm and a length of 780mm is processed. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. Heat the ingot at 400°C for 16 hours, perform upsetting multi-directional forging on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the reduction of the elongation pass is 5 -10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the ingot is lower than 350°C, return to the furnace for annealing...
Embodiment 3
[0025] Example 3: Firstly, a large furnace is used to melt the alloy raw material, and then a Mg-9.0Al-0.8Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) magnesium alloy ingot with a diameter of Ф600mm is cast by semi-continuous casting. The cast ingot is subjected to mechanical turning, cutting, chamfering and other treatments in turn, and the final processed ingot size is Ф550mm in diameter and 650mm in length. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. Upsetting and drawing multi-directional forging is carried out on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, the reduction of the elongation pass is 5-10%, and the temperature of the upper and lower cutting boards 150-300°C. Heat the ingot to 410°C for 8 hours before forging. During the forging process, when the surface temperat...
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