초록 ▼

A traction bending apparatus bends workpieces (such as tubes and aluminum extrusions) with good thickness and wrinkling control, in circular arcs or in shapes clearly distinct from circular arcs, with cold forging of the workpieces for springback control, with smooth symmetric bending of symmetrical

A traction bending apparatus bends workpieces (such as tubes and aluminum extrusions) with good thickness and wrinkling control, in circular arcs or in shapes clearly distinct from circular arcs, with cold forging of the workpieces for springback control, with smooth symmetric bending of symmetrical parts, and with smooth bending of non-symmetrical parts, without jaw marks. The apparatus can readily effect multi-point bending and can be used with workpieces of any length. A stationary die support mounts a die adjacent a first end of the support, and has first and second control arms pivotally mounted to the die support second end. The first and second linear actuators, preferably hydraulic cylinder assemblies with piggyback pneumatic cylinder assemblies, are connected to the control arms to provide powered pivoting movement thereof. First and second traction arms are pivotally mounted to the control arm and have first and second workpiece engaging rollers. Third and fourth linear actuators, preferably hydraulic cylinders, are pivotally connected to the die support at an intermediate section, and to the traction arms. A stripper linear actuator is mounted to the die support to effect movement of the workpiece bent by the apparatus away from the die support, and a clamping linear actuator clamps the workpiece for good thickness and wrinkling control. A computer control mechanism (e.g. PLC) provides control of the linear actuators to effect desired bending.

대표청구항 ▼

Traction bending apparatus for bending workpieces, comprising: a stationary die support for mounting a die adjacent a first end thereof and having a second end remote from said first end, and an intermediate section between said first and second ends; first and second control arms pivotally mounted

Traction bending apparatus for bending workpieces, comprising: a stationary die support for mounting a die adjacent a first end thereof and having a second end remote from said first end, and an intermediate section between said first and second ends; first and second control arms pivotally mounted at first and second pivot axes, respectively, to said die support at a first portion of each, adjacent said die support second end; first and second linear actuators connected to said first and second control arms, respectively, providing powered pivoting of said control arms about said first and second pivot axes, respectively; first and second traction arms pivotally mounted at third and fourth pivot axes, respectively, to said first and second control arms at a second portion of said control arms, remote from said first portion of each control arm; first and second workpiece engaging members associated with said first and second traction arms remote from said third and fourth pivot axes; third and fourth linear actuators connected to said first and second traction arms, respectively, providing powered pivoting of said traction arms about said third and fourth pivot axes, respectively; and a control mechanism for allowing at least one of manual, semiautomatic, and automatic control of said linear actuators to move said workpiece engaging members into operative association with a workpiece engaging a die mounted on said die support to effect desired bending of the workpiece.