Pipe machining apparatus

Abstract

In a pipe machining apparatus A, a region of a part including a first pressure contact part 61 a which comes into pressure contact with a first portion 11 a of a pipe P in a lower clamper part 6 of a clamping device C serves as a first movable clamper part 61 which is separate from a different region 63 of the lower clamper part 6 , and the pipe machining apparatus A includes a first displacement member 8 A that is able to displace the first movable clamper part 61 in a predetermined first direction D 1 after machining of the pipe P ends. According to such a constitution, a pipe machining apparatus capable of appropriately resolving aggravation of workability of removing a pipe caused by a part of the pipe which comes into pressure contact with a lower clamper part of a clamping device can be provided.

What is claimed is: 
     
         1 . A pipe machining apparatus comprising:
 a clamping device that has a lower clamper part on which a pipe is placed and an upper clamper part which is positioned above the lower clamper part and able to ascend and descend, and is able to clamp an end part of the pipe between the lower clamper part and the upper clamper part; and   a pipe machining part that causes a machining tool to abut the end part of the pipe and performs machining of the end part in a state in which the end part of the pipe is clamped by the clamping device,   wherein the lower clamper part is provided with a first pressure contact part which comes into pressure contact with a first portion of the pipe at a time of machining of the pipe and receives a force in a first direction from an outward side toward an inward side in an axial length direction of the pipe from the first portion,   wherein a region of a part including the first pressure contact part in the lower clamper part is constituted as a first movable clamper part which is separate from different regions of the lower clamper part, and   wherein the pipe machining apparatus further comprises a first displacement member that is able to displace the first movable clamper part in the first direction after machining of the pipe ends.   
     
     
         2 . The pipe machining apparatus according to  claim 1 ,
 wherein the end part of the pipe is provided with an annular projection part having a partially larger outer diameter than other portions of the pipe,   wherein the first movable clamper part has a recessed step part where the annular projection part enters when the pipe is clamped by the clamping device,   wherein at the time of machining of the pipe, a stepped part close to a center of the pipe in the axial length direction in the annular projection part is constituted to come into pressure contact with a side wall part of the recessed step part, and   wherein the stepped part is the first portion, and the side wall part of the recessed step part is the first pressure contact part.   
     
     
         3 . The pipe machining apparatus according to  claim 2 ,
 wherein the machining tool includes an expansion/contraction deformation part which is able to enter an inner side of the annular projection part and expand the annular projection part at the time of machining of the pipe, and a pressing part which presses the annular projection part in the first direction from the outward side thereof.   
     
     
         4 . The pipe machining apparatus according to  claim 2 ,
 wherein both end parts including the end part of the pipe and an end part on a side opposite thereto are respectively provided with a pair of annular projection parts as the annular projection part,   wherein the lower clamper part has a pair of recessed step parts as the recessed step part where the pair of annular projection parts enter when the pipe is clamped by the clamping device, and   wherein at least a pair of pipe machining parts which can cause the machining tool to abut both the end parts of the pipe from lateral sides thereof are provided as the pipe machining part.   
     
     
         5 . The pipe machining apparatus according to  claim 1 ,
 wherein the first displacement member is a first elastic member which elastically biases the first movable clamper part in the first direction at all times, and   wherein the pipe machining apparatus further comprises a first movable clamper part operation part that displaces the first movable clamper part in a second direction opposite to the first direction against an elastic biasing force of the first elastic member such that the first pressure contact part is positioned at a location where the first pressure contact part comes into pressure contact with the first portion at the time of machining of the pipe.   
     
     
         6 . The pipe machining apparatus according to  claim 5 ,
 wherein the first movable clamper part operation part includes a pushing part which is able to ascend and descend in response to the upper clamper part, and the pushing part is constituted to descend in response to the upper clamper part and abut the first movable clamper part such that the first movable clamper part is pushed in the second direction when the pipe is clamped by the clamping device.   
     
     
         7 . The pipe machining apparatus according to  claim 1 ,
 wherein the lower clamper part is provided with a second pressure contact part which comes into pressure contact with a second portion positioned on a tip side of the pipe from the first portion in the pipe at the time of machining of the pipe and receives a force in a second direction opposite to the first direction from the second portion,   wherein a region of a part including the second pressure contact part in the lower clamper part is constituted as a second movable clamper part which is separate from the different regions of the lower clamper part and the first movable clamper part, and   wherein the pipe machining apparatus further comprises a second displacement member that is able to displace the second movable clamper part in the second direction after machining of the pipe ends.   
     
     
         8 . The pipe machining apparatus according to  claim 7 ,
 wherein the second displacement member is a second elastic member which elastically biases the second movable clamper part in the second direction at all times.   
     
     
         9 . The pipe machining apparatus according to  claim 1 ,
 wherein there is a plurality of pipes as the pipe,   wherein the clamping device is able to clamp the plurality of pipes,   wherein a plurality of pipe machining parts is provided as the pipe machining part, and machining in which shapes of end parts of the plurality of pipes are changed in stages by the plurality of pipe machining parts is able to be performed, and   wherein the first movable clamper part is provided in a manner of corresponding to at least one pipe machining part of the plurality of pipe machining parts.