Tool position controller of bending machine

A tool position controller of a bending machine comprising:

• a die having an upper portion divided into two pieces along a longitudinal direction of said die to form a groove between said two pieces;
• die push-up means provided under said die in at least one position along the longitudinal direction of said die for pushing up the die, said push-up means includes a pair of pins each hanging a lower end and an upper end which is connected with said die through a respective die base to transmit a pushing-up force to said die and a height control mechanism for controlling the heights of said pins, said height control mechanism being provided of said lower end of each of said pins;
• and
• feed quantity control means connected to said die push-up means for controlling a feed quantity of said die push-up means on the basis of working conditions previously inputted to said tool position controller, said feed quantity control means includes an electric servo motor, a control unit for controlling said electric servo motor, a recirculating ball nut rotatably driven by said electric servo motor through a pair of bevel gears and a screw threadably engageable with said recirculating ball nut, said screw being moveable upwardly and downwardly as said recirculating ball nut rotates while provided with an upper end abutting on a lower end of said height control mechanism;
• whereby at least one piece of work may be clamped between a punch and a counter sheet-metal support under pressure, said counter sheet-metal support being interposed between said two pieces of said die, said punch being fixedly mounted on a front end of a ram movable upwardly and downwardly by a pressure applying/holding hydraulic cylinder, and said die being liftable by said die push-up means so that said piece of work may be subjected to a bending operation by relative movement between said punch and said die.

A tool position controller of a bending machine comprising:

• a die having an upper portion divided into two pieces along a longitudinal direction of said die to form a groove between said two pieces;
• die push-up means provided under said die in at least one position along the longitudinal direction of said die, said push-up means includes a pair of pins each having a lower end and an upper end which is connected with said die through as respective die base to transmit a pushing-up force to said die, height control mechanism for controlling said pins in height, said height control mechanism being provided at said lower end of each of said pins, and a bending hydraulic cylinder provided with a piston rod connected with a piston slidably mounted in a cylinder of said bending hydraulic cylinder so as to be moveable upwardly and downwardly, said bending hydraulic cylinder being connected with a lower end of said height control mechanism through said piston rod thereof while controlled in hydraulic pressure applied thereto by said feed quantity control means;
• and
• said height control mechanism abutting on said lower end of each of said pins, said height control mechanism includes a pair of upper wedges away from each other by a compressing spring, a lower wedge for supporting said supper wedges on an upper surface having a pair of inclined planar surfaces intersecting at a central portion of said lower wedge and forming the highest portion of said lower wedge, a pair of side plates each fixedly mounted on each opposite side surfaces of said lower wedge and a pair of adjusting screws each threadably engaged with each side plate disposed outside said upper wedges so as to pass through each of said side plates and each of said adjusting screws having a front end abutting on an outer surface of each of said upper wedges disposed inside said side plates;
• and
• feed quantity control means connected to said die push-up means for controlling a feed quantity of said die push-up means on the basis of working conditions previously inputted to said tool position controller;
• whereby at least one piece of work may be clamped between a punch and a counter sheet-metal support under pressure, with said counter sheet-metal support being interposed between said two pieces of said die, said punch being fixedly mounted on a front end of a ram moveable upwardly and downwardly by a pressure applying/holding hydraulic cylinder, and said die being liftable by said die push-up means so that said piece of work may be subjected to a bending operation by relative movement between said punch and said die.