JPH0547298B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a forming machine in which forming rolls can operate quickly, improving forming ability and preventing defects on plates. be.

[Conventional technology]

Conventionally, a forming machine has been used to form a metal plate into a tubular shape. However, with conventional forming machines, (i) the forming rolls are allowed to escape during sheet threading, and the forming rolls are slowly set in place by an electric motor after the sheet threading, resulting in large time losses and poor work efficiency; (ii) Increasing the forming capacity may cause scratches on the board and reduce product quality, among other problems.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a forming machine in which a forming roll can be operated quickly, and which can simultaneously improve forming capacity and prevent defects on plates due to forming. It is something.

[Means for solving problems]

The present invention provides a fluid pressure cylinder supported such that a downwardly extending piston rod disposed inside a material to be molded can be positioned inside the radius of curvature of the molding material to be molded, and a distal end of the piston rod. left and right hydraulic pistons provided in the section so as to be able to move forward and backward in diagonal directions, and inner rolls each pivotally supported at the tips of both hydraulic pistons so as to be able to abut inside the molding material; a position detector for detecting the position of the fluid pressure piston; a servo valve connected to a pipeline for applying fluid pressure to the fluid pressure piston; a pressure detector connected to the pipeline; and a position setting device. and a position setting device that outputs a signal, and based on the signal output from the position setting device, the position detection signal output from the position detector, and the pressure detection signal output from the pressure detector. and an arithmetic control device that outputs a signal to the servo valve.

[Effect]

In the present invention, when the position setting device sets the position of the inner roll to the arithmetic and control device, a signal is output from the arithmetic and control device to the servo valve, the servo valve opens in response to the signal, and fluid pressure is transmitted through the pipe. act on the hydraulic piston to move the inner roll towards the molding material.

The amount of movement of the hydraulic piston is detected by a position detector and fed back to the arithmetic and control unit.
When the hydraulic piston moves at a position corresponding to the signal from the setting device, the servo valve is closed, the inner roll is positioned, and the material is formed by the inner roll.

At this time, the molding reaction force is output from the pressure detector as a pressure signal to the arithmetic and control device, and the arithmetic and control device adjusts the opening degree of the servo valve based on the signal from the detector.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

A vertical fluid pressure cylinder 2 is attached to a required frame 1, and a piston rod 3 of the fluid pressure cylinder 2 is attached.
A plurality of sets of fluid pressure pistons 4 that can move forward and backward in diagonal directions are provided at the lower end, and the fluid pressure pistons 4
An inner roll 5 for forming is attached to the hydraulic piston 4, a detector 6 for detecting the position of the hydraulic piston 4 is attached to the hydraulic piston 4, and a servo valve 8 and a A pressure sensor 9 is connected to the position sensor 6 and the pressure sensor 9.
The detected signal can be transmitted to the arithmetic and control device 10, and the position of the inner roll 5 can be set to the arithmetic and control device 10 by a setting device 11,
A command signal can be output from the arithmetic and control device 10 to the servo valve 8.

In the figure, 12 is an outer roll, 13 is a bottom roll, and 14 is a molding material.

During molding, the piston rod 3 is lowered to a predetermined position by the fluid pressure cylinder 2, and the inner roll 5 is lowered to a predetermined position by the setting device 11.
Set the position of For this reason, a command signal is output from the arithmetic and control device 10 to the servo valve 8, and the servo valve 8 opens in response to the command signal, and the pressure fluid acts on the fluid pressure piston 4 from the pipe line 7, and the fluid pressure piston 4 The inner roll 5 moves toward the material 14 side.

The amount of movement of the hydraulic piston 4 is detected by the position detector 6 and fed back to the arithmetic and control unit 10, and when it reaches a set position, the servo valve 8 is closed and the inner roll 5 is positioned. The inner roll 5 pushes the inside of the radius of curvature of the material 14 to perform molding, but during molding, the molding reaction force acting on the inner roll 5 is detected as pressure by the pressure detector 9, and its signal is detected. is the arithmetic control unit 1
Sent to 0.

If the pressure detected by the pressure detector 9 is excessive, a command signal is output from the arithmetic and control device 10 to the servo valve 8, which opens and pressurized oil is supplied to the head side, and the inner roll 5 is The fluid pressure piston 4 is retracted so that the molding reaction force that is applied becomes a predetermined value.

In the embodiments of the present invention, a case has been described in which a fluid pressure piston with an inner roll attached is controlled by a control system, but it is also possible to control a vertical fluid pressure cylinder. It goes without saying that the pressure cylinder can also be implemented as an electric motor, and that various other changes can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the molding machine of the present invention, it is possible to quickly move the inner roll for molding, so it is possible to perform quick operations at the time of shedding or threading, improving work efficiency, and also improving the molding efficiency. In addition to improving molding capacity, the inner roll can be released in the event of excessive molding reaction force, preventing scratches on the plate and improving product quality, among other excellent effects. It can be played.

[Brief explanation of the drawing]

The figure is an explanatory view of one embodiment of the molding machine of the present invention. In the figure, 2 is a hydraulic cylinder, 3 is a piston rod, 4 is a hydraulic piston, 5 is an inner roll,
6 is a position detector, 7 is a pipe line, 8 is a servo valve, 9 is a pressure detector, 10 is an arithmetic and control unit, 11 is a position setting device, and 14 is a molding material.

Claims (1)

[Claims] 1 A fluid pressure cylinder supported so that a piston rod extending downward can be positioned inside the radius of curvature of the molding material to be molded, and a hydraulic cylinder provided at the tip of the piston rod so as to be able to move forward and backward in an oblique direction. left and right hydraulic pistons, inner rolls each pivotally supported at the tips of both hydraulic pistons so as to be able to abut inside the molding material, and a position detector for detecting the position of the hydraulic pistons. a servo valve connected to a conduit for applying fluid pressure to the fluid pressure piston, a pressure detector connected to the conduit, and a position setting device that outputs a position setting signal, an arithmetic control device that outputs a signal to the servo valve based on a signal output from the position setting device, a position detection signal output from the position detector, and a pressure detection signal output from the pressure detector; A molding machine characterized by comprising: