A method for multi-directional pre-deformation rolling of the edge of a wide magnesium alloy thick plate
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A magnesium alloy, pre-deformation technology, applied in the direction of metal rolling, metal rolling, metal rolling racks, etc., can solve the problems of high magnesium plate prices, plate edge cracks and even surface cracks, etc., to improve the edge Stress distribution state and anisotropy, preventing the generation and expansion of cracks at corners, and improving the yield of finished products
Active Publication Date: 2017-06-23
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0007] Due to the above and many other reasons, in the hot rolling production process of wide-width magnesium alloy thick plates, serious defects such as edge cracks and even surface cracks often appear in the plates, resulting in a yield of only 30% to 40%, and the price of magnesium plates remains high.
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Embodiment 1
[0033] The size of the wide-width magnesium alloy thick plate slab in this embodiment is: 1500mm×1000mm×300mm, and a wide-width magnesium alloy plate with a width of 2300mm and a thickness of 50mm is prepared. The rolling method includes the following three process sequences:
[0034] Process sequence 1: Edge pre-deformation rolling, front and rear vertical rolls and inclined rolls combined reciprocating rolling 4 passes: the process parameters of each pass are set as shown in the table below:
[0035]
[0036] Process sequence two: widening and rolling, the magnesium plate is rotated 90°, cross-rolled by a four-roll mill for 3 passes, and the reduction in each pass is: 20%, 30%, and 30%, and rolled to a specified width of 2300mm. The following table shows the process parameter settings:
[0037]
[0038] Process sequence 3: Combined rolling of stretching length and multi-directional compression deformation at the edge, the rolled piece is rotated 90° again, the distanc...
Embodiment 2
[0041] The size of the wide-width magnesium alloy thick plate slab in this embodiment is: 2000mm×1500mm×200mm, and a wide-width magnesium alloy plate with a width of 2000mm and a thickness of 60mm is prepared. The rolling method includes the following three process sequences:
[0042] Process sequence 1: 5 passes of reciprocating rolling with vertical rolls and skewed rolls before and after flat roll rolling: the process parameters of each pass are set as shown in the table below:
[0043]
[0044] Process sequence 2: Rotate the magnesium plate by 90°, and cross-roll it with a four-high rolling mill for 2 passes. The reduction in each pass is 15% and 17%, and it is rolled to a specified width of 2000mm. The process parameters for each pass are set as shown in the table below. Show:
[0045]
[0046] Process sequence three: the rolled piece is rotated 90° again, the distance between each pair of vertical rolls is 2000mm, no adjustment is made, and the vertical rolls, inc...
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Abstract
The invention discloses a method and device for multi-directional pre-deformation rolling of the edge of a wide magnesium alloy thick plate. A coordinative rolling method for synchronous application of pressure stress in the directions of the width and the thickness of the plate is adopted. The device comprises a four-high mill, pre-rolling vertical roll / inclined roll combination device and a post-rolling inclined roll / vertical roll combination device. The method for multi-directional pre-deformation rolling of the edge of the wide magnesium alloy thick plate comprises the three steps that (1) edge pre-deformation reciprocating rolling is conducted in the length direction of the magnesium plate; (2) the magnesium plate is rotated by 90 degrees, and broadening reciprocating rolling is conducted; (3) the rolled piece is rotated by 90 degrees again, and lengthening and edge multi-directional compressive deformation combined rolling is conducted so as to form the final thickness. In the rolling process, distribution of the rolling reduction of vertical rolls and inclined rolls and the side pressure angles of the inclined rolls is conducted according to a technological control model. According to the method and device for multi-directional pre-deformation rolling of the edge of the wide magnesium alloy thick plate, due to the fact that multi-roll multi-directional pressure deformation is applied to the edge of the magnesium plate, broadening of the magnesium plate can be limited in the rolling process, a good plate shape can be obtained, the frequency of generation and extension of cracks on the edge is reduced, and the yield of the magnesium alloy plate is improved.
Description
technical field [0001] The invention belongs to the technical field of preparation of wide-width magnesium alloy thick plates, and in particular relates to a new rolling method for multi-directional pre-deformation of the edges of wide-width magnesium alloy thick plates. Background technique [0002] The wrought magnesium alloy plate products produced by the rolling process have good structure and mechanical properties, can largely replace steel and aluminum alloy plates, and have very broad applications in aviation, transportation, construction and other fields prospect. [0003] Due to its close-packed hexagonal structure, the plastic forming ability of magnesium alloy is very poor at room temperature. In order to activate the non-basal slip system in the magnesium alloy structure and improve its plastic forming performance, the existing technology mostly adopts the production method of hot rolling to prepare magnesium. Alloy sheet. [0004] During the multi-pass hot rol...
Claims
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