Manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material

Abstract

A manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material is disclosed. The method includes an extrusion process and a rolling process. By the plastic deformation feature of the two processes, the wide-range fine-grained magnesium alloy thin-sheet material that satisfies the requirement of cases of 3C products with thickness of less than 1 mm is produced. Thus the method overcomes shortcomings of a conventional method that produces the material by a plurality passes of processes. Therefore, the manufacturing cost is reduced and the method is able to be applied to various industries.

1 . A manufacturing method for wide-range fine-grained magnesium alloy thin-sheet material comprising the steps of:
 providing a magnesium alloy billet;   extruding the magnesium alloy billet through a U-shaped die hole to get an U-shaped extruded material;   pressing and leveling the U-shaped extruded material into a wide-range sheet material;   rolling the wide-range sheet material into a wide-range thin-sheet material; and   annealing the wide-range thin-sheet material to wide-range fine-grained magnesium alloy thin-sheet material.   
   
   
       2 . The method as claimed in  claim 1 , wherein thickness of the U-shaped die hole ranges from 1.5 mm to 5 mm. 
   
   
       3 . The method as claimed in  claim 2 , wherein optimum thickness of the U-shaped die hole is 2.0 mm. 
   
   
       4 . The method as claimed in  claim 1 , wherein width of the wide-range sheet material ranges from 0.7 to 2.1 times of the diameter of the magnesium alloy billet. 
   
   
       5 . The method as claimed in  claim 4 , wherein optimum width of the wide-range sheet material is 1.3 times of the diameter of the magnesium alloy billet. 
   
   
       6 . The method as claimed in  claim 1 , wherein working temperature of the step of pressurizing and leveling the U-shaped extruded material is between 250 degrees Celsius and 400 degrees Celsius. 
   
   
       7 . The method as claimed in  claim 6 , wherein optimum working temperature of the step of pressing and leveling the U-shaped extruded material is 350 degrees Celsius. 
   
   
       8 . The method as claimed in  claim 1 , wherein a roller is used to roll the wide-range sheet material in the step of rolling the wide-range sheet material. 
   
   
       9 . The method as claimed in  claim 8 , wherein temperature of the roller is between 100 degrees Celsius and 200 degrees Celsius. 
   
   
       10 . The method as claimed in  claim 9 , wherein optimum temperature of the roller is 120 degrees Celsius. 
   
   
       11 . The method as claimed in  claim 8 , wherein working speed of the roller ranges from 1 m/min to 4 m/min. 
   
   
       12 . The method as claimed in  claim 8 , wherein optimum working speed of the roller is 2.0 m/min. 
   
   
       13 . The method as claimed in  claim 1 , wherein the step of rolling the wide-range sheet material further comprising a step of: heating the wide-range sheet material. 
   
   
       14 . The method as claimed in  claim 13 , wherein temperature for heating the wide-range sheet material ranges from 250 degrees Celsius to 400 degrees Celsius. 
   
   
       15 . The method as claimed in  claim 13 , wherein optimum temperature for heating the wide-range sheet material is 300 degrees Celsius. 
   
   
       16 . The method as claimed in  claim 1 , wherein reduction ratio of the step of rolling the wide-range sheet material ranges from 20% to 70%. 
   
   
       17 . The method as claimed in  claim 16 , wherein optimum reduction ratio of the step of rolling the wide-range sheet material is 50%. 
   
   
       18 . The method as claimed in  claim 1 , wherein temperature for annealing the wide-range thin-sheet material ranges from 250 degrees Celsius to 400 degrees Celsius 
   
   
       19 . The method as claimed in  claim 18 , wherein optimum temperature for annealing the wide-range thin-sheet material is 300 degrees Celsius. 
   
   
       20 . The method as claimed in  claim 1 , wherein a duration of the step of annealing the wide-range thin-sheet material ranges from 1 hour to 3 hours. 
   
   
       21 . The method as claimed in  claim 20 , wherein optimum duration of the step of annealing the wide-range thin-sheet material is 1 hour.