JPS6336928A - Method and device for correcting springback - Google Patents

Abstract

PURPOSE:To easily correct a springback with a manual work by measuring the springback amount caused in a 1st time bending and performing the bending by the amount double the value thereof. CONSTITUTION:A pointer 8 is fixed at the standard position of the scale 28 for measuring fitted to the cylinder 26 for slide shaft of a ram 2 and when the scale 4 fixed to the ram 2 is moved by driving the cylinder 22 for pressing, the spy needle 6 held by the scale 4 presses the ram 2 until being locked by the pointer 8. The driving of the cylinder 22 for pressing is then stopped and the amount of the ram 2 returned by the springback of a pipe W is read from the scale 282 for measuring the springback pointed by the needle 6. When the needle 6 is moved up to the position of the springback amount located on an enlarged scale 284, the distance between the pointer 8 and needle 6 becomes two times the springback amount. When the pressing of the ram 2 is released by pressing the ram 2 with the driving of the cylinder 22 again until the needle 6 is locked by the pointer 8, the ram 2 bends the pipe W by the amount of the return target.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a springback correction device and a correction method thereof, and in particular, the present invention relates to a springback correction device and a correction method thereof. This invention relates to an improvement in springback correction gW and a correction method thereof, which is suitable for manual correction without using any equipment.

[Conventional technology]

Conventionally, a pipe bending device or a manufacturing device for large-diameter thick-walled bent pipes has been disclosed, for example, in Japanese Patent Application Laid-Open No. 56-151.
There was Publication No. 123 or Japanese Unexamined Patent Publication No. 109526/1983.

However, the bending device shown in the above-mentioned prior art is
None of these had a mechanism for correcting the springback that inevitably occurs during the bending process.

On the other hand, some have been equipped with complicated control devices such as electric circuits in order to correct the springback caused by the pipe bender.

In other words, as a demonstration of such technology,
Publication No. 7-42255 or JP-A-56-13402
There is Publication No. 1.

[Problem that the invention seeks to solve]

However, since the conventional springback correction method requires a complicated control device, there is a problem that accurate correction cannot be performed without a precision machine tool such as an NC machine.

Another problem is that commercially available manual pipe benders cannot be equipped with complex control devices.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to manually correct spring banks in a simple manner during a bending process using a pipe bender.

[Means for solving problems]

For this reason, the springback correction device and the correction method according to the present invention are characterized in that the amount of springback that occurs during the first bending is measured, and the amount of springback that is doubled is bent. It is something.

Specifically, the first invention according to the present invention includes a ram fixed to a telescopic rod of a pressing cylinder and a tip of a slide shaft of a sliding shaft cylinder, and a ram fixed to the ram in parallel with the pressing cylinder. , a scale movable in conjunction with the ram, a spy needle supported on the scale and slidable on the scale, and a measuring device attached to a cylinder for a slide shaft of the ram. This is a springback correction device characterized by comprising a pointer supported on a measurement scale and fixed at a reference position on the measurement scale.

Further, the second invention is such that the scale fixed to the ram is moved by driving the pressing cylinder with the pointer fixed at the reference position of the measuring scale attached to the cylinder for the slide shaft of the ram. , a first step of pressing the ram until the spy needle carried on the scale is locked with the pointer, and stopping the driving of the pressing cylinder to calculate the amount by which the ram is spring-backed. a second step of reading from the measuring scale pointed to by the spy needle; a third step of moving the spy needle to a magnified position of the measuring scale; and driving the pressing cylinder again to read the spy needle. A fourth step of pressing the ram until the ram is locked with the pointer.

[Effect]

To explain in detail the present invention according to the above configuration, first,
Fix the pointer to the reference position of the measurement scale attached to the cylinder for the slide shaft of the ram.

Next, by driving the pressing cylinder to move the scale fixed to the ram, the ram is pressed until the spy needle carried on the scale is locked with the pointer.

Next, by stopping the driving of the pressing cylinder, the amount by which the ram is springback is read from the measuring scale indicated by the spy needle.

Next, move the spy needle to the magnification position of the measurement scale.

Next, the pressing cylinder is driven again to press the ram until the spy needle is locked to the pointer.

In this way, the spring bank can be corrected.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

(First Embodiment) FIG. 1 is a front view schematically showing a first embodiment of a correction device used to carry out the spring bank correction method according to the present invention, and FIG. 2 shows a ram sliding mechanism. FIG. 3 is a front view chronologically showing a springback correction method.

The springback correction device 1 includes a ram 2, a scale 4, a spy needle 6, and a pointer 8.

The ram 2 is fixed to the tip of the telescopic rod 24 of the pressing cylinder 22. The pressing cylinder 22 is driven by, for example, hydraulic pressure.

The scale 4 is fixed to the ram 2 and is movable in conjunction with the ram 2.

The spy needle 6 is supported on the scale 4 and is slidable on the scale 4.

The pointer 8 is carried by a measuring scale 28 attached to the slide shaft cylinder 26 of the ram 2, and can be fixed at a reference position on the measuring scale 28.

The spy needle 6 is connected to the pipe W where the ram 2 is the workpiece.
When pressed, it comes into contact with the pointer 8, restricting its movement, and slides on the scale 4.

Furthermore, the measurement scale 28 includes a spring bank measurement scale 282 and a magnification scale 284 provided parallel to this.
It consists of

In addition, 12 is a bottle for locking the pipe W, 27 is a slide shaft for supporting a ram, and 23 and 25 are set pins.

Here, the sliding mechanism of the ram 2 will be explained with reference to FIG. 2. When fixing a pipe (not shown),
First, the ram supporting slide shaft 27 is inserted into the ram 2 and fixed with the set pin 25.

At this time, the slide shaft cylinder 26 is provided parallel to the pressing cylinder 22.

Next, when the ram 2 is pressed, the ram supporting slide shaft 27 expands and bends the pipe.

Next, when the pressing of the ram 2 is released, the telescopic rod 24 of the pressing cylinder 22 returns to its original position because the connecting portion 21 is a loose fit.

On the other hand, the ram 2 is held by the ram supporting slide shaft 27 and is returned by the amount of spring back of the pipe.

In this way, ram 2 operates.

A springback correction method using the correction device 1 according to the first embodiment will be described with reference to FIG. 3.

First, the pointer 8 is fixed at the reference position of the measuring scale 28 attached to the slide shaft cylinder 26 of the ram 2.

Next, by driving the pressing cylinder 22 to move the scale 4 fixed to the ram 2, the ram 2 is pressed until the spy needle 6 carried by the scale 4 is locked with the pointer 8.

In this embodiment, the pressure is applied to the target of 100 m.

FIG. 3(A) shows this state.

Next, by stopping the driving of the pressing cylinder 22, the amount by which the ram 2 has been returned by the spring bank of the pipe W is read from the springback measurement scale 282 pointed to by the spy needle 6.

If this spring bank amount is a, then a=4 m in this embodiment. FIG. 3(B) shows this state.

Next, the spy needle 6 is moved to the reading position on the magnification scale 284. As a result, the distance between the pointer 8 and the spy needle 6 is twice the amount of springback, that is, 2
It becomes a. This state is shown in FIG. 3(C).

Next, the pressure cylinder 22 is driven again, and the spy needle 6
Push the ram 2 until it is locked to the pointer 8. FIG. 3(D) shows this state.

Then, when the pressure on the ram 2 is released from this state, the ram 2 returns by an amount a due to springback, so that the pipe W can be bent by the target amount.

In this way, springback can be corrected.

(Second Embodiment) FIG. 4 is a front view schematically showing a second embodiment of a correction device used to carry out the springback correction method according to the present invention, with only the pointer and spy needle portions extracted.

In the second embodiment, parts that are the same as those in the first embodiment will be described using the same numbers, and only parts that are different from the first embodiment will be described.

That is, the second embodiment differs from the first embodiment in that the spy needle 6 is of a two-stage type including a springback measurement scale spy needle 62 and a magnification scale spy needle 64.

This eliminates the need to move the spymeter 6 when aligning the spy needle 6 with the magnification scale 284, as in the first embodiment, thereby making it possible to prevent errors caused by misreading.

Note that there is no fundamental difference in the springback correction method from the first embodiment, so a detailed explanation will be omitted.

Although specific embodiments of the present invention have been described above, the present invention is not limited thereto, and various other embodiments that can be implemented by those skilled in the art are possible within the scope of the claims.

For example, in the above embodiment, the pressing cylinder is driven by hydraulic pressure, but it may be driven by air instead of hydraulic pressure.

〔Effect of the invention〕

As explained above, the springback correction device and the correction method according to the present invention measure the amount of springback that occurs during the first bending and bend the amount twice that value. During the bending process using the spring bank, the spring bank can be manually compensated for.

In addition, since no control device is required, it can be performed even in a workplace without a power source, and has the excellent effect that anyone can perform it without requiring specialized knowledge of precision machine tools.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing a first embodiment of a correction device used to implement the springback correction method according to the present invention, FIG. 2 is a front view showing a ram slide mechanism, and FIG. 4 is a front view showing the spring bank correction method in chronological order, and FIG. It is a front view shown schematically. 1... Springback correction device 2...
--- Ram 4 --- Scale 6 --- Spy needle 8 --- --- Pointer 22 ---1 --- Pressing cylinder 24 ---・-Telescopic rod 26...--Slide shaft cylinder 2111--
---Measurement scale applicant Toyota Motor Corporation Figure 2

Claims (2)

[Claims] (1) A ram fixed to the extensible rod of the pressing cylinder and the tip of the sliding shaft of the sliding shaft cylinder, and fixed to the ram parallel to the pressing cylinder and movable in conjunction with the ram. a scale; a spy needle carried on the scale and slidable on the scale; carried on a measuring scale attached to a slide shaft cylinder of the ram; A springback correction device comprising a pointer that can be fixed at an upper reference position. (2) With the pointer fixed at the reference position of the measurement scale attached to the cylinder for the slide shaft of the ram, the scale fixed to the ram is moved by driving the pressure cylinder, and the scale is carried on the scale. a first step of pressing the ram until the spy needle is locked with the pointer, and stopping the driving of the pressing cylinder, so that the spy needle points to the amount by which the ram is spring-backed. a second step of reading from the measurement scale; a third step of moving the spy needle to the magnification position of the measurement scale; and a third step of driving the pressing cylinder again to cause the spy needle to engage with the pointer. a fourth step of pressing the ram until it stops.