JPS5992120A - Bending device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a bending device H applied to, for example, cold bending of pipes, and particularly to rolling mills, turbines, generators, and other hydraulic piping, pneumatic Pipes made of materials with high elasticity for piping!
(1) Relating to a bending cutter device d suitable for cutting.

[Prior art]

Conventional lifting platforms for cold bending metal pipes and the like simply rely on a bender that has the ability to bend to a predetermined bending angle. These conventional benders do not have the function to judge whether the amount of bending is too much or too little, so after bending, they usually remove the workpiece, such as a pipe, from the bender.
The excess or deficiency of the amount of bending is determined by visual measurement by the worker.1
After that, repeat the process of attaching it to the pentacle again and making corrective bends. For this reason, there were problems such as the work being extremely inefficient, requiring a long time + iJJ, and products of poor quality being produced.

[Purpose of the invention]

The present invention was made based on such circumstances, and has a springback t measurement P and 16 positive bending functions,
Bending/JL that improves work efficiency and product quality
Our goal is to provide I/O equipment If.

[Invention is cheap]

The bending process according to the present invention has a holding die for holding a work piece and a bending die for giving a gripping heel 1 extension action so that the bending part of the work piece can be released at the bending position.
The bending mold has a bending means capable of repeatedly re-holding the bending portion of the soak and performing normal bending, and is placed at the bending position of the workpiece, and the workpiece release and related operations of the front six self-bending molds are performed. Then, a sensor that detects the spring bank f of the workpiece and a self-memory circuit for the set value of the bending amount for the workpiece are used, and this set value is compared with the springback value from the sensor for the workpiece, and the bending deficiency is determined. It is constructed by a control unit having an arithmetic circuit for calculation and a command circuit for giving a corrected bending command to the bending means based on the underbending needle.

[Embodiments of the invention]

An embodiment of the present invention is shown below in the drawings. This will be explained with reference to f-. The bending apparatus according to this embodiment is intended for bending pipes for the distribution of oil and pneumatic equipment.

First, the bending means will be explained. The bending means 1 includes a first
As shown in the figure, it has a holding die 3 that holds the pipe 2, and a bending die 4 that removably holds the pipe 2 at the bending position of the bending portion 2Ai and provides a bending force. Holding type 3
The pressure mold 5 and the booster clamp mold 6 which clamp the pipe 2 are fixedly installed through supports 7 and 8, respectively. The pressure type 5 is configured to be clamped in a direction perpendicular to the pipe 2 by a pressure type cylinder 9. In addition, the booster clamp type 6 is a booster clamp type cylinder 1.
1, the clamping operation is performed in a direction perpendicular to the pipe 2. The booster clamp mold 6 and the pressure mold 5 are adapted to operate in the longitudinal direction of the eve 2 (by the booster 10 via the support 8).

On the other hand, the bending die 4 is
Clamp type 4A that clamps in the direction perpendicular to
It has a rotating mold 13 that can rotate about 2. The shaft 12 has a gear 14 directly connected thereto meshed with a driving gear 15, and is directly connected to a hydraulic servo motor 17 of this gear 15.

Next, the sensor will be explained. The sensor 18 has pin-shaped probes 19 and 20 arranged in parallel to the clamp d4A so as to be able to advance and retreat from the clamping direction, and as shown in Fig. The probes 19 and 20 are biased from the clamping direction 2A in the protruding direction by a drive mechanism 21 using a spring or the like, so that each of the probes 19 and 20 comes into contact with the pipe 2 when the clamp mold 4A is opened after bending. It is something. The difference in the amount of protrusion of each probe 19.degree. 20 is detected by a detector (not shown) provided within the clamp mold 4A.

Next, the control circuit will be explained. The sub-side j circuit 22 includes a microcomputer 23 operated by an operation panel 22.
, a sequencer 24. The microcomputer 23 includes a storage circuit for storing a set value of the amount of bending for the pipe 2, an arithmetic circuit that compares this set value with the springback amount of the pipe 2 and calculates the amount of insufficient bending, and a bending means based on the amount of insufficient bending. 1 has a command circuit for giving a corrected bending command. It also has a control circuit for clamping and unclamping the pipe 2 with respect to the bending means 1, and for all settings such as initial bending. The microcomputer 23 is connected to the motor 17, the sensor 18, etc., and the sequencer 24 is connected to each type of driving cylinder. Note that 25 is a clamp cylinder for fixing the bending mold, and is used when changing the mold, etc.

Next, the operation will be explained. The source of operation is hydraulic.

Pressure type cylinder 9, booster clamp type cylinder 11, and clamp type cylinder IIA each move 1' in response to a start command from sequencer 24, and pressure 1i15, booster clamp type 6, and clamp type 3 as a holding device are all unclamped. Then, the pipe 2, which will be the material for the bending soak, is inserted into the mold. Next, the pressure type cylinder 9, booster clamp type cylinder 11, and clamp type cylinder IIA are operated according to the command from the sequencer 24, and the pressure type 5, booster clamp type 6, and clamp type 3 are clamped with the pipe 2 inserted.

In this state d, the hydraulic servomorph 17 receives the angle setting signal from the microcomputer 230, and simultaneously rotates the rotary mold 13 via the gear 14°15, and at the same time rotates the clamp 1i4.
A rotates at the same time. At this time, the booster 10 is operated in the longitudinal direction of the pipe 2 at the same time as the rotary die 13, but depending on whether it is a push operation or a pull operation, it is possible to bend by push bending or pull bending method. Become. In other words, the bending angle, springback, thickness reduction rate, etc. of the pipe 2 are affected depending on whether the pipe 2 is bent while being pulled or pushed.

In this embodiment, it is possible to use both methods or to use free bending without restraint of the booster 10, and these three methods are possible.
By being able to select the bending method, it is possible to perform bending that is suitable for various types of pipes. After bending in this way, only the clamp mold 4A is opened by the clamp mold cylinder IIA (
When the pipe 2 is operated (inverted), the pipe 2 expands due to springback beyond the normal bending angle, so the amount of expansion, that is, the springback M, is detected by the sensor 18, and is detected by the detection circuit and calculation circuit inside the microcomputer 23. The amount of springback is detected and calculated, and the corrected bending angle corresponding to the amount of springback is calculated and given to the hydraulic servomorph 17 as an angle signal. The hydraulic servo motor 17 further rotates by an angle corresponding to the angle from the normal position. At this time, the open clamp mold 4A is returned to the clamped state by the clamp mold cylinder IIA. Repeat this action several times.

Note that if the angle according to the set value is obtained by one bending, then step 4 will be completed in one bending.

The pipe 2, which has been bent at the correct angle, is transferred to the pressure cylinder 9.
, the booster clamp type cylinder 11 and the clamp type cylinder IIA are operated multiple times according to the commands of the sequencer 24, and the pressure type 5, booster clamp type 6 and clamp li
4. From the At-clamp state to the unclamp state, take out the pipe 2. All operation commands for the sequencer 24 and microcomputer 23 are operated by the operation panel 22A.

It is also possible to bend pipes 2 with different diameters, but in this case, the rotary die 13 may be replaced depending on the pipe diameter. In this case, the clamp type 4A is the rotary type 13
Since it is clamped by the clamp cylinder IIA, this clamp cylinder 11Ai is brought into an unclamped state, the rotary mold 13 is replaced, and then the pipe is brought into a clamped state again according to the pipe diameter.

The above operation will be specifically explained with reference to FIG. 4.

In the figure, (A) shows the state before bending, (B) shows the state bent by 90 degrees, and (C) shows the state after the clamping force of the clamp mold 4A is removed, and the pipe 2 is displaced due to springback. As shown in (D), the springback amount [θ- tan”(δ1−δ2/l
)) can be obtained by (note that δ=δ1−δ2
).

To explain the entire theory of bending operations based on such functions, as shown in Fig. 5, first, in order to obtain a predetermined zero angle during pipe bending, bending is performed at an initial input value θ, and A When the bending force is removed at the point, the actual bending angle is δ
This means that there is a springback of θ-θ0.

Therefore, in order to get even closer to θ, if the bending blade is added to point B and removed, the actual bending angle becomes θ010. Repeat this process several more times to reach a predetermined bending angle of 0.

This procedure is as shown in FIG.
A trial bend (32) is performed along the line. Next is the shortage θ. The measurement (33) is performed using the sensor, and the main correction θ10 is performed through the arithmetic circuit and the command circuit (34).

After measurement by the sensor (35), tolerance comparison (3)
6) If necessary, perform feedback (37) to the Cine IlIIIjIk measurement, and stop (Stop (38)) at the end of bending to a predetermined value in accordance with the set value.

According to this embodiment, the pipe can be bent with a stable degree of bending to a predetermined bending dimension, and quality can be improved. Furthermore, such an action can be performed automatically and continuously without the extra effort of removing the pipe from the device.

In addition, in the embodiment described in "F" η, the bending means can be selected from push bending, pulling around, and free bending, but any one of
Of course, the present invention can also be fully implemented even if it has two functions.

Moreover, although the sensor 18 detects springback by mechanical means, it is of course possible to employ electromagnetic or optical means.

Furthermore, as in the above-mentioned embodiments, it is of course applicable to bending not only pipes but also various bar materials.

〔Effect of the invention〕

As explained above, according to the bending apparatus according to the present invention, since the bending process is performed while measuring the springback amount during bending of the workpiece, a positive bending angle can be obtained. , and the bending is defective! # does not occur. Furthermore, since automatic and continuous bending can be performed, the working nt rate can be significantly improved.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a schematic configuration diagram showing the entire device, Fig. 2 is a configuration diagram showing main parts in detail, and Fig. 3 is a cross-sectional view showing an enlarged sensor section. Figure 4 (A
) to (D) are action explanatory diagrams, FIG. 5 is a % property diagram explaining the bending theory, and FIG. 6 is a flowchart showing the action. 1... Bending means, 2... Pipe, 3... Holding m,
2A...Bending part, 4...1 Tage type, 4A Kawakunpu type, 5... Pressure type, 6... Booster clamp type, 7, 8... Sabo-1, 9...・Pressure type cylinder, 1
o...Booster, 11...Prust lamp type cylinder, 11 people...Cylinder, 12...Axis, 13...
・Rotation [,14,15...gear, 16...41+,
17... Hydraulic servo motor, 18... Sensor, 19
, 20... Measuring head, 21... Drive mechanism, 22...
Operation f') l [1, 23... microcomputer, 2
4...Sequencer. Chi 1st / 3rd mouth A 4th day (A) (β) (C,) 4th eye (shi) 岑 6th mouth B concave

Claims (1)

[Claims] 1. A holding mold that holds a workpiece and a bending mold that removably grips the bending force part of the workpiece at a bending position and applies a bending action, and the bending mold has a bending mold that applies a bending force to the workpiece. A bending means capable of corrective bending by repeatedly re-holding the bent portion, and a li? Placed at the bending carving position of the J workpiece,
a sensor that operates in conjunction with the opening of the workpiece of the bending die to detect the springback amount of the workpiece; a memory circuit for setting the bending amount for the workpiece; and a control means having a command circuit that provides a correction bending command to the bending means based on the bending shortage amount and a calculation circuit that calculates a bending shortage amount by comparing the bending amount. 2. Bending according to claim 1, characterized in that the bending means has a support and a means for moving along the axial direction of the workpiece for selectively imparting push bending, pull bending, and free bending functions to the holding die. Processing equipment. 3. The sensor has a pair of d (11 constants) that can move forward and backward on the anti-soak flange surface of the bending mold, and that are arranged in parallel with a certain interval between them. 114. The bending device according to claim 1, characterized in that the springback M'tc 1jll is determined based on the difference in each protrusion amount and the distance between the measuring probes.