Method of producing casing

Abstract

There is provided a method of producing a casing configured such that adjacent surfaces of the casing are maintained to be perpendicular to each other. A method of producing a casing includes: a first part forming step of forming a first part by pouring molten metal into a cavity formed inside a first die including a first die portion and a second die portion, the cavity corresponding to the first part, the first part including two plate portions connected to each other such that an angle between main surfaces of the two plate portions of the first part becomes 90°, the two main surfaces of the two plate portions of the first part being formed by only one of the first die portion and the second die portion; and a second part forming step of forming a second part by pouring the molten metal into a cavity formed inside a second die including a third die portion and a fourth die portion, the cavity corresponding to the second part, the second part including two plate portions connected to each other such that an angle between main surfaces of the two plate portions of the second part becomes 90°, the two main surfaces of the two plate portions of the second part being formed by only one of the third die portion and the fourth die portion.

1 . A method of producing a casing,
 the method comprising:   a first part forming step of forming a first part by pouring molten metal into a cavity formed inside a first die including a first die portion and a second die portion, the cavity corresponding to the first part, the first part including two plate portions connected to each other such that an angle between main surfaces of the two plate portions of the first part becomes 90°, the two main surfaces of the two plate portions of the first part being formed by only one of the first die portion and the second die portion;   a second part forming step of forming a second part by pouring the molten metal into a cavity formed inside a second die including a third die portion and a fourth die portion, the cavity corresponding to the second part, the second part including two plate portions connected to each other such that an angle between main surfaces of the two plate portions of the second part becomes 90°, the two main surfaces of the two plate portions of the second part being formed by only one of the third die portion and the fourth die portion;   a casing forming member assembling step of forming a casing forming member including three plate portions by assembling the first part formed in the first part forming step and the second part formed in the second part forming step; and   a casing forming step of forming a casing by using the casing forming member formed in the casing forming member assembling step.   
     
     
         2 . The method according to  claim 1 , wherein:
 in the first part forming step, the cavity in the first die is formed such that an intersection line where the main surfaces of the two plate portions of the first part intersect with each other is located at a lowest position inside the first die; and   in the second part forming step, the cavity in the second die is formed such that an intersection line where the main surfaces of the two plate portions of the second part intersect with each other is located at a lowest position inside the second die.   
     
     
         3 . The method according to  claim 2 , wherein:
 in the first part forming step, the cavity in the first die is provided such that the first part is formed inside the first die in such a posture that a direction in which one of the plate portions of the first part extends from the intersection line is inclined relative to a horizontal plane; and   in the second part forming step, the cavity in the second die is provided such that the second part is formed inside the second die in such a posture that a direction in which one of the plate portions of the second part extends from the intersection line is inclined relative to the horizontal plane.   
     
     
         4 . The method according to  claim 1 , wherein the molten metal is prepared by melting aluminum. 
     
     
         5 . The method according to  claim 1 , wherein the casing is a controller casing accommodating a control board. 
     
     
         6 . The method according to  claim 5 , wherein the control board is a control board configured to control a robot. 
     
     
         7 . A method of producing a casing,
 the method comprising:   a third part forming step of forming a third part by pouring molten metal into a cavity formed inside a third die including a fifth die portion and a sixth die portion, the cavity corresponding to the third part, the third part including two plate portions connected to each other such that an angle between main surfaces of the two plate portions of the third part becomes 90°, the two main surfaces of the two plate portions of the third part being formed by only one of the fifth die portion and the sixth die portion;   a casing forming member assembling step of forming a casing forming member including three plate portions by using and assembling the two third parts formed in the third part forming step; and   a casing forming step of forming a casing by using the casing forming member formed in the casing forming member assembling step.