Shot peening device

Abstract

A shot peening device includes a turntable which rotates about a revolution axis, holding mechanism which moves with the turntable, pressure mechanism which compresses a coil spring, rotation mechanism which rotates the coil spring, projection mechanism which projects shots to the compressed coil spring, load cell which detects a load applied to the coil spring, and controller. A signal output from the load cell is input to the controller, and the controller detects a chronological change of the load applied to the coil spring during the shot peening.

What is claimed is: 
     
         1 . A shot peening device comprising:
 a turntable mechanism including a turntable which rotates around a revolution axis;   a revolution mechanism which rotates the turntable mechanism;   a holding mechanism which holds a lower end turn portion and an upper end turn portion of a coil spring while the coil spring is kept standing and moves around the revolution axis with the turntable;   a rotation mechanism which rotates the holding mechanism around a rotation axis;   a pressure mechanism which compresses the coil spring in a state where the coil spring is held by the holding mechanism;   a load detector which detects a load applied to the coil spring by the pressure mechanism;   a projection mechanism which projects a shot to the compressed coil spring; and   a controller which detects a change in the load based on a signal output from the load detector.   
     
     
         2 . The shot peening device of  claim 1 , wherein the load detector is a load cell disposed in a load transfer path between the pressure mechanism and the holding mechanism. 
     
     
         3 . The shot peening device of  claim 1 , wherein the controller includes means for storing a chronological change of the load. 
     
     
         4 . The shot peening device of  claim 2 , wherein the controller includes means for storing a chronological change of the load. 
     
     
         5 . The shot peening device of  claim 1 , wherein the controller includes a display which displays a chronological change of the load. 
     
     
         6 . The shot peening device of  claim 2 , wherein the controller includes a display which displays a chronological change of the load. 
     
     
         7 . The shot peening device of  claim 3 , wherein the controller includes a display which displays a chronological change of the load. 
     
     
         8 . The shot peening device of  claim 4 , wherein the controller includes a display which displays a chronological change of the load. 
     
     
         9 . The shot peening device of  claim 1 , wherein the controller includes means for notifying that the load becomes out of an acceptable range while the projection mechanism projects shots to the coil spring. 
     
     
         10 . The shot peening device of  claim 2 , wherein the controller includes means for notifying that the load becomes out of an acceptable range while the projection mechanism projects shots to the coil spring. 
     
     
         11 . The shot peening device of  claim 1 , wherein the controller controls the pressure mechanism such that the load becomes a constant value while the projection mechanism projects shots to the coil spring. 
     
     
         12 . The shot peening device of  claim 2 , wherein the controller controls the pressure mechanism such that the load becomes a constant value while the projection mechanism projects shots to the coil spring.