Rotor and manufacturing method thereof

Abstract

A manufacturing method of a rotor includes the following steps. A substrate is processed to form a first patterned area, a second patterned area and a third patterned area. The second patterned area is formed around the first patterned area, and the third patterned area is connected to the second patterned area. The first patterned area is processed to form a case. The third patterned area is bent towards the case along a joint line between the second patterned area and the third patterned area to form the blades. The rotor includes a case, a connecting portion and the blades. The case is cylindrical and has a sidewall. The connecting portion is extended from one end of the sidewall of the case. The blades are extended from the connecting portion.

1 . A manufacturing method of a rotor, comprising steps of:
 processing a substrate to form a first patterned area, a second patterned area and a third patterned area, wherein the second patterned area is formed around the first patterned area, and the third patterned area is connected to the second patterned area;   forming a cylindrical case by processing the first patterned area; and   bending the third patterned area towards the cylindrical case along a joint line between the second patterned area and the third patterned area to form a blade.   
   
   
       2 . The method according to  claim 1 , wherein the first patterned area, the second patterned area and the third patterned area are formed by punching process. 
   
   
       3 . The method according to  claim 1 , wherein the cylindrical case is formed by processing the first patterned area with a drawing process, a vacuum drawing process or a punching process. 
   
   
       4 . The method according to  claim 1 , wherein the third patterned area is bent towards the cylindrical case along the joint line by about 90 degrees. 
   
   
       5 . The method according to  claim 1 , further comprising a step of:
 forming an axial portion on the first patterned area.   
   
   
       6 . The method according to  claim 5 , wherein the axial portion is a through hole. 
   
   
       7 . The method according to  claim 1 , wherein the substrate is made of metal, iron, steel, aluminum or aluminum alloy. 
   
   
       8 . A rotor comprising:
 a case having a sidewall;   a connecting portion connected to one end of the sidewall of the case; and   a blade connected to the connecting portion, wherein the blade and the connecting portion are integrally formed as a single piece.   
   
   
       9 . The rotor according to  claim 8 , wherein the case is cylindrical. 
   
   
       10 . The rotor according to  claim 8 , wherein the case, the connecting portion and the blade are made of metal, iron, steel, aluminum or aluminum alloy. 
   
   
       11 . The rotor according to  claim 8 , wherein a first angle is formed between the connecting portion and the sidewall of the case. 
   
   
       12 . The rotor according to  claim 11 , wherein the first angle is about 90 degrees. 
   
   
       13 . The rotor according to  claim 8 , wherein a second angle is formed between the blade and the connecting portion. 
   
   
       14 . The rotor according to  claim 13 , wherein the second angle is about 90 degrees. 
   
   
       15 . The rotor according to  claim 8 , wherein the case and the connecting portion are integrally formed as a single piece. 
   
   
       16 . The rotor according to  claim 8 , wherein the rotor is applied to a fan. 
   
   
       17 . The rotor according to  claim 8 , wherein the case further comprises an axial portion. 
   
   
       18 . The rotor according to  claim 17 , wherein the axial portion is a through hole.