Heat treatment apparatus

Abstract

The present invention provides a heat treatment apparatus for carrying out heat treatment for a circular workpiece. The heat treatment apparatus includes a treatment room configured to carry out a predetermined treatment for the workpiece, a transportation mechanism configured to transport the workpiece into the treatment room and out of the treatment room, and a mounting table on which the workpiece transported into the treatment room is mounted. The transportation mechanism is provided with a transportation arm which mounts and transports the workpiece. The transportation arm is provided with at least three transport support pins which support the workpiece when the workpiece is transported, and the mounting table is provided with at least three mounting table support pins which support the workpiece.

What is claimed is: 
     
         1 . A heat treatment apparatus for carrying out carburizing treatment and/or quenching treatment for a circular workpiece comprising:
 a treatment room configured to carry out a predetermined treatment for the workpiece;   a transportation mechanism configured to transport the workpiece into the treatment room and out of the treatment room; and   a mounting table, provided in the treatment room, on which the workpiece transported into the treatment room is mounted, wherein the transportation mechanism includes a transportation arm which mounts and moves the workpiece, the transportation arm provided with at least three transport support pins which support the workpiece when the workpiece is transported, and   at least three mounting table support pins which support the workpiece are provided on the mounting table.   
     
     
         2 . The heat treatment apparatus according to  claim 1 , wherein the mounting table is configured with at least three support fans each provided with the mounting table support pin, and each of the support fans is provided so as to radially protrude from a center of the mounting table in a plan view. 
     
     
         3 . The heat treatment apparatus according to  claim 1 , wherein at least three protruding portions which protrude toward a center of the mounting table and can support the workpiece between the support fans in a plan view are provided on a distal end of the transportation arm, and each of the protruding portions is provided with the transport support pin which is arranged to support the workpiece between the support fans in a plan view. 
     
     
         4 . The heat treatment apparatus according to  claim 1 , further comprising an ascend-and-descend mechanism which makes the mounting table ascend and descend. 
     
     
         5 . The heat treatment apparatus according to  claim 1 , wherein the workpiece has a shape formed of a circular top portion and a cylindrical side portion, and the mounting table support pin is arranged on the mounting table so as to be on a circumference having an approximately a same diameter as an inner diameter of a side portion of the workpiece. 
     
     
         6 . The heat treatment apparatus according to  claim 1 , wherein the workpiece has a shape formed of a circular top portion and a cylindrical side portion, and the transport support pin is arranged on the transportation arm so as to be on a circumference having an approximately a same diameter as an inner diameter of a side portion of the workpiece. 
     
     
         7 . The heat treatment apparatus according to  claim 1 , further comprising a rotation mechanism which rotates the mounting table. 
     
     
         8 . The heat treatment apparatus according to  claim 1 , wherein the mounting table support pin and the transport support pin are arranged on a same circumference when the workpiece is mounted on the mounting table. 
     
     
         9 . The heat treatment apparatus according to  claim 1 , wherein the transportation arm includes an assist pin provided in a periphery of each transport support pin. 
     
     
         10 . The heat treatment apparatus according to  claim 9 , wherein at least a portion of a side, facing a side surface of the workpiece, of the assist pin is formed in a tapered shape which becomes thinner toward a top end of the assist pin. 
     
     
         11 . The heat treatment apparatus according to  claim 1 , further comprising a tray which supports the workpiece, wherein the tray supporting the workpiece is supported by the transport support pin and then transported by the transportation arm to be mounted on the mounting table support pin, and
 at least three tray pins which support the workpiece are provided on a top surface of the tray.   
     
     
         12 . The heat treatment apparatus according to  claim 11 , wherein the tray has a shape formed of a circular top portion and a cylindrical side portion, and the mounting table support pin is arranged on the mounting table so as to be on a circumference having an approximately a same diameter as an inner diameter of a side portion of the tray. 
     
     
         13 . The heat treatment apparatus according to  claim 11 , wherein the tray has a shape formed of a circular top portion and a cylindrical side portion, and the transport support pin is arranged on the transportation arm so as to be on a circumference having an approximately a same diameter as an inner diameter of a side portion of the tray. 
     
     
         14 . The heat treatment apparatus according to  claim 11 , wherein the workpiece has a shape formed of a circular top portion and a cylindrical side portion, and the tray support pin is arranged on the tray so as to be on a circumference having an approximately a same diameter as an inner diameter of a side portion of the workpiece.