Machining unit and machining apparatus

Abstract

There is provided a machining unit ( 10 ) that machines a rod-shaped member (W). The machining unit ( 10 ) includes: a first unit ( 23 ) including a first split die portion on an upper side, out of upper and lower split die portions that form a pair and include a bending channel that bends the rod-shaped member (W), and a first clamp portion on an upper side, out of upper and lower clamp portions that form a pair and hold the rod-shaped member inserted into the bending channel; a second unit ( 22 ) including a second split die portion on a lower side out of the upper and lower split die portions that form a pair and a second clamp portion on a lower side out of the upper and lower clamp portions that form a pair; a pressure unit ( 30 ) including a holding channel that holds the rod-shaped member in the bending channel from an outer circumferential side of the bending channel; and an opening-closing unit ( 69 ) that opens and closes the first unit ( 23 ), the second unit ( 22 ), and the pressure unit ( 30 ) in three different directions with respect to a setting center (C) that is a position of a center axis of the rod-shaped member (W) in a state where the rod-shaped member (W) is set the bending channel.

1 . A machining unit comprising:
 a first unit including a first split die portion on an upper side, out of upper and lower split die portions that form a pair and include a bending channel that bends a rod-shaped member, and a first clamp portion on an upper side, out of upper and lower clamp portions that form a pair and hold the rod-shaped member inserted into the bending channel;   a second unit including a second split die portion on a lower side out of the upper and lower split die portions that form a pair and a second clamp portion on a lower side out of the upper and lower clamp portions that form a pair;   a pressure unit that includes a holding channel that holds the rod-shaped member in the bending channel from an outer circumferential side of the bending channel; and   an opening-closing unit that opens and closes the first unit, the second unit, and the pressure unit in three different directions relative to a setting center that is a position of a center axis of the rod-shaped member in a state where the rod-shaped member has been set in the bending channel, and includes:   a first opening-closing unit that opens and closes the first unit and the second unit in a balanced manner; and   a second opening-closing unit that operates in concert with the first opening and closing unit that moves the pressure away from and toward the setting center, and includes:   a skirt-shaped cylindrical cam that moves up and down in concert with the first opening-closing unit; and   a cam follower that moves while contacting with a circumferential surface of the skirt-shaped cylindrical cam and, in concert with the skirt-shaped cylindrical cam moving up and down and the first unit and the second unit opening and closing, moves the pressure unit relative to the bending channel so as to open and close the pressure unit.   
     
     
         2 .- 3 . (canceled) 
     
     
         4 . The machining unit according to  claim 1 ,
 wherein the first opening-closing unit includes:   a first opening-closing shaft that moves the first unit up and down;   a second opening-closing shaft that moves the second unit up and down;   a left-hand and right-hand screw member that moves the first opening-closing shaft and the second opening-closing shaft up and down in opposite directions; and   an opening-closing motor that rotates the left-hand and right-hand screw member.   
     
     
         5 . The machining unit according to  claim 4 ,
 wherein the second opening-closing unit includes:   a holder that supports the pressure unit so as to swing relative to the first opening-closing shaft and the second opening-closing shaft; and   a support portion that supports the holder so as to be capable of revolving relative to the first opening-closing shaft and the second opening-closing shaft.   
     
     
         6 . The machining unit according to  claim 1 ,
 wherein the pressure unit includes a pressure roller including the holding channel that includes an arc-shaped part,   and the machining unit further comprises:   a first driving unit that rotates the first unit and the second unit about a first axis in a state where the first unit and the second unit are closed; and   a second driving unit that rotates the pressure unit about the first axis independently of the first driving unit in a state where the pressure unit is closed.   
     
     
         7 . The machining unit according to  claim 6 ,
 wherein the pressure unit includes at least one pressure unit disposed on one out of two positions on the left and the right.   
     
     
         8 . The machining unit according to  claim 7 ,
 wherein the second driving unit includes:   an opening-closing cam follower that opens and closes the at least one pressure unit; and   an inclined cylindrical cam that rotates about the first shaft so as to close the opening-closing cam follower.   
     
     
         9 . The machining unit according to  claim 1 ,
 wherein the upper and lower clamp portions that form a pair are clamp portions that are common to leftward and rightward bending and include clamping channels that intersect in an X shape.   
     
     
         10 . A machining apparatus comprising:
 the machining unit according to  claim 1 ,   a work supporting unit that supports the rod-shaped member; and   a moving unit that moves at least one of the machining unit and the work supporting unit to carry out a first operation that sets a center axis of an unmachined part of the rod-shaped member supported by the work supporting unit at the setting center of the machining unit and a second operation that sets the center axis of the unmachined part at a withdrawn position away from the setting center.   
     
     
         11 . The machining apparatus according to  claim 10 ,
 wherein the moving unit relatively moves the center axis of the unmachined part of the rod-shaped member supported by the work supporting unit in a straight line in a first direction between the setting center and the withdrawn position, and supports the machining unit so that an opening-closing direction of the first unit and the second unit is inclined to the first direction.   
     
     
         12 . The machining apparatus according to  claim 10 ,
 wherein the machining unit includes a mechanism that bends the rod-shaped member both of leftward and rightward, and   the moving unit includes a first moving unit that swings the machining unit leftward and rightward while moving the machining unit up and down.   
     
     
         13 . The machining apparatus according to  claim 12 ,
 wherein the first moving unit includes:   a base;   a holder that swings relative to the base;   a slide plate that supports the machining unit so as to slide up and down inside the holder;   a first cam channel in the vertical direction provided in the base;   a second cam channel provided in the slide plate in a direction perpendicular to a direction in which the slide plate slides;   a turn gear that includes a turn roller that moves inside the first cam channel and the second cam channel; and   a turn motor that is held by the holder and rotationally drives the turn gear.   
     
     
         14 . A machining apparatus comprising:
 the machining unit according to  claim 1 ; and   a twist unit that supports the machining unit so as to rotate around a second axis that passes the setting center,   wherein the twist unit includes:   a twist gear that is ring shaped, supports the machining unit, and includes a first cutaway portion where one part towards a center is missing;   a twist driving unit that drives the twist gear;   a plurality of guide rollers that support an outer circumferential surface of the twist gear so that the twist gear rotates about the second axis; and   a support unit that supports the plurality of guide rollers,   wherein the support unit includes:   a second opening that is centered on the second axis and is larger than a first opening inside a ring of the twist gear; and   a second cutaway portion that reaches the second opening and is open in a direction perpendicular to the second axis, and   the plurality of guide rollers are disposed facing the second opening and at least part of the twist gear is supported so as to rotate inside the second opening.   
     
     
         15 . The machining apparatus according to  claim 14 ,
 further comprising:   a chuck unit that supports an unmachined part of the rod-shaped member along the second axis on an opposite side of the machining unit with the support unit in between; and   a feeding unit that controls a relative distance between the chuck unit and the support unit,   wherein the chuck unit includes a work holding portion that extends along the second axis and passes through the first opening when a distance between the support unit and the chuck unit is reduced.   
     
     
         16 . A method comprising carrying out a bending process on a rod-shaped member using a machining apparatus including a machining unit, according to  claim 1 ,
 wherein the method comprises setting the rod-shaped member by moving, before the carrying out the bending process and in a state where the upper split die portion and the upper clamp portion, the lower split die portion and the lower clamp portion, and the pressure unit have been opened in three different directions with respect to a setting center which is a position of a center axis of the rod-shaped member in a state where the rod-shaped member is set in the bending channel, the rod-shaped member relatively to the setting center in a straight line, and includes inclining the machining unit and supplying and discharging on a common path for leftward and rightward bending by moving the rod-shaped member in a straight line.   
     
     
         17 . The method according to  claim 16 ,
 wherein the bending process includes bending in a left-right direction of the rod-shaped member set at the setting center at the setting center.   
     
     
         18 . The method according to  claim 16 ,
 wherein the machining apparatus includes a twist unit that supports the machining unit so as to rotate around a second axis that passes the setting center,   wherein the twist unit includes:   a twist gear that is ring shaped, supports the machining unit, and includes a first cutaway portion where one part towards a center is missing;   a twist driving unit that drives the twist gear; and   a support unit that rotationally supports the twist gear and includes: a second opening that is larger than a first opening in a ring of the twist gear and is centered on the second axis; and a second cutaway portion that is open in a direction perpendicular to the second axis and reaches the second opening,   the machining apparatus further includes:   a turn unit that makes an attachment angle of the machining unit to the twist gear inclined to a direction of the first cutaway portion; and   a chuck unit that supports an unmachined part of the rod-shaped member along the second axis on an opposite side of the machining unit with the support unit in between, and   the method further comprises:   the twist driving unit rotating, before the setting, the twist gear so that the first cutaway portion and the second cutaway portion match; and   the turn unit setting the attachment angle so that a direction in which the rod-shaped member is released when the first unit, the second unit, and the pressure unit are opened and a direction of the first cutaway portion and the second cutaway portion are in a straight line, and   the setting includes moving the chuck unit and the twist unit relatively in a direction of the straight line to set the rod-shaped member at the second axis.   
     
     
         19 . The method according to  claim 18 ,
 wherein the machining apparatus further includes a feeding unit that controls a relative distance between the chuck unit and the support unit,   the chuck unit includes a work holding portion that extends along the second axis, and   the method further comprises:   the feeding unit reducing, before the carrying out the bending process, a distance between the support unit and the chuck unit and passing the work holding portion through the second opening; and   the work holding portion re-holding, once the rod-shaped member has been held by the machining unit and the feeding unit increases the distance between the support unit and the chuck unit, the rod-shaped member.