Patent ID: 7975361

Claim:
A method of carrying out after-treatment of coarse aluminum castings that are continuously carried out by a cellular manufacturing system, wherein a robot having a holding means that can hold two coarse aluminum castings carries each of the coarse aluminum castings one by one to first and second machining units that carry out an after-treatment on the coarse aluminum castings, the method, comprising holding an untreated coarse aluminum casting that is located at a predetermined position of a carrying-in corner with a holding means that can hold two coarse aluminum castings at the same time and carrying an untreated coarse aluminum casting to the first machining unit by the robot, holding and removing a first treated coarse aluminum casting that has been treated by the first machining unit with the holding means as well as transferring the untreated coarse aluminum casting from the holding means to the first machining unit, carrying the first treated coarse aluminum casting that has been treated by and removed from the first machining unit to the second machining unit by the robot, holding and removing a second treated coarse aluminum casting that has been treated by the second machining unit with the holding means as well as transferring the first treated coarse aluminum casting that has been treated by the first machining unit from the holding means to the second machining unit, and carrying the second treated coarse aluminum casting that has been treated by and removed from the second machining unit to a predetermined position at a carrying-out corner by the robot.