JP2554368Y2 - Pressed product residual stress analyzer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for analyzing the residual stress of a press product formed by a press die.

[0002]

2. Description of the Related Art When a pressed product such as a panel roof is formed, a residual stress (spring back) is generated at the time of forming. Therefore, as shown in FIG. When the thickness D, the regular shape E, and the bending profile F are used, a press die is manufactured in consideration of the angles θ1, θ2, and θ3 with respect to the regular shape E.

[0003]

However, since the expected values of the angles θ1, θ2, and θ3 are determined by experience, individual differences occur. In addition, since the shape of the workpiece at the time of processing cannot be visually recognized, mold repair is repeated by trial and error based on the result of the finished product. Therefore, many man-hours are required. Further, since the relative relationship between the press die and the press product cannot be grasped, no technical data remains.

On the other hand, the mold accuracy is only in a new state, and measurement is not performed in a final state. Even if mold measurement is performed, there is a problem that setup is troublesome because measurement is performed by a three-dimensional measuring machine.

An object of the present invention is to provide an apparatus for analyzing the residual stress of a pressed product which has solved the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the gist of the present invention is to provide a guide cam on which a work is placed and which can move forward and backward in a horizontal direction, and a fixed cam arranged opposite to the guide cam. A lower die having a cam, a non-contact sensor comprising a laser irradiator and a CCD camera arranged toward the molding die of the guide cam, and advancing the guide cam by contacting the lower die guide cam. An upper die having an operating fixed cam and a processing cam abutting on the lower die fixed cam and advancing in the guide cam direction. The processing cam penetrates the laser beam of the non-contact sensor. And an opening in which the bending blade is removably mounted. The non-contact type sensor measures a plurality of fixed points of the formed portion of the pressed product on the guide cam, and the difference from the guide cam shape, the spring, Controller for finding back amount It is those with a personal computer.

[0007]

According to the above configuration, at the time when the work is press-formed by the lower die and the upper die, the bent blade is removed from the processing cam,
Through the opening of the processing cam, the non-contact type sensor measures a plurality of fixed points of the formed part of the pressed product on the guide cam and transmits the data to the personal computer via the controller,
Convert the measurement data by PC software and draw the cross-sectional shape. Then, the difference from the guide cam shape and the amount of springback are obtained, and this is displayed and printed out by the printer.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a press body, 2 is a lower mold, and 3 is an upper mold.

The lower die 2 has a guide cam 5 on which a workpiece 4 can be placed and which can move forward and backward in a horizontal direction, a fixed cam 9 disposed opposite to the guide cam 5, and a molding of the guide cam 5. A non-contact type sensor 13 including a laser irradiator 13a and a CCD camera 13b (see FIG. 8) is provided on the measuring instrument mounting piece 14 toward the mold.

The upper die 3 is provided with a guide cam 5 of the lower die 2.
A fixed cam 10 for advancing the guide cam 5 by contacting the
A machining cam 7 which comes into contact with the fixed cam 9 of the lower die 2 and advances in the direction of the guide cam 5;

The non-contact type sensor 1 is provided on the machining cam 7.
3 through which the laser beam penetrates and the bent plate key plate 8
The opening 1 in which the bending blade 8b integral with a is detachably mounted.
Two. This opening 12 is, as shown in FIG.
The height H is determined by the measurement distance.

A controller 15, a personal computer 16 and a printer 17 are arranged outside the press body 1, and a cable 18 is connected between the non-contact sensor 13 and the controller 15.
Connected with. Reference numeral 11 denotes a lock block for fixing the guide cam 5 when measuring.

The outline of the measuring principle for analyzing the residual stress of a pressed product by the apparatus of the present invention having the above-mentioned structure is shown in FIGS. 8 and 9. At a plurality of fixed points a to
f is measured and plotted and displayed on the display of the personal computer 16. At the same time, the difference from the guide cam 5 and the springback amount are displayed.

In the press forming of the work 4, the bending blade 8 b is inserted and fixed in the opening 12 of the processing cam 5. The molding operation is performed as usual by lowering the upper die 3 so that the fixed cam 10 on the upper die 3 abuts on the guide cam 5 of the lower die 2,
Slides to the left in FIG. Next, the pad 6 contacts the work 4 on the guide cam 5 and presses the work 4 onto the guide cam 5.

Further, the upper die 3 descends, and the processing cam 7 comes into contact with the fixed cam 9 on the lower die 2 side, and the processing cam 7 slides toward the guide cam 5 to gradually bend the work 4 with the bent blade 8b. ,
The work 4 is press-formed into a predetermined shape at the bottom dead center of the upper die 3. Thereafter, the upper mold 3 is moved up, and the operation reverse to the above-mentioned operation is performed to perform the work 4 of the product press-formed at the top dead center of the upper mold 3.
Can be taken out.

When measuring the amount of springback, the lock block 11 is inserted into the rear end of the guide cam 5 at the bottom dead center of the upper die 3 of the molding operation as shown in FIGS. Then, when the upper die 3 returns to the top dead center, the bending blade 8b
Is removed from the processing cam 7. Thus, the opening 12 is opened in the processing cam 7. Then, the product work 4 on the guide cam 5 is taken out, and the non-contact sensor 13
The measurement data is transmitted to the personal computer 16 via the controller 15. Then, the measurement data is converted by the software of the personal computer 16, and the sectional shape of the guide cam 5 is drawn.

On the other hand, in the press die, the upper die 3 is operated to the bottom dead center, the lock block 11 is removed, the upper die 3 is returned to the top dead center, the product work 4 taken out is put on the guide cam 5, and again. The upper die 3 is lowered and raised, and the product work 4 on the guide cam 5 is measured by the non-contact sensor 13 as shown in FIG. This measurement data is transmitted to the personal computer 16 via the controller 15. Then, the measurement data is converted by the software of the personal computer 16 and the sectional shape of the product work 4 is drawn.

The difference between the guide cam 5 and the product work 4 and the amount of springback are calculated from the two sectional shape drawings obtained in this way, displayed on the display of the personal computer 16 and output to the printer 17. It is possible to do.

According to the present invention, it is also possible to measure a plastic change during molding. This is because the product work 4 is loaded onto the guide cam 5 with the bending blade 8b removed from the processing cam 7, and the processing cam 7 is moved by the fixed cam 9 on the lower 3 side.
The upper die 3 is lowered to the point where the slide is started in the direction of (1), and the upper die 3 is inchingly moved (inching), and as shown in FIG. Product work 4 during processing until the mold 3 reaches the bottom dead center
By transmitting the measurement data to the personal computer 16 via the controller 15 in the same manner as described above, the plastic change during molding can be measured.

[0020]

As described above, according to the present invention, a guide cam on which a workpiece is placed and which can move forward and backward in a horizontal direction, a fixed cam disposed opposite to the guide cam, and a molding die of the guide cam are provided. A lower die provided with a non-contact type sensor comprising a laser irradiator and a CCD camera arranged toward the unit, a fixed cam which abuts on the lower type guide cam and operates the guide cam forward, and the lower die And an upper die having a working cam that abuts on the fixed cam and advances in the guide cam direction. The working cam penetrates the laser beam of the non-contact type sensor, and the bending blade is detachable. Having an opening attached to the
The non-contact sensor measures a plurality of fixed points of the forming part of the pressed product on the guide cam, and the difference from the guide cam shape,
Since it is equipped with a controller and a personal computer that calculates the amount of spring back, the expected amount of the press die (spring back) and the finished product shape can be quantitatively compared and displayed numerically, and the relative relationship between the press die and the molded product can be grasped. And technical data can be left. Therefore, there is an advantage that the number of mold repairing steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the overall configuration of the device of the present invention.

FIG. 2 is a cross-sectional view of a state in which a top dead center of the upper mold is moved.

FIG. 3 is a sectional view showing a state where a guide cam is measured by a non-contact type sensor.

FIG. 4 is a cross-sectional view of a forming state of a work.

FIG. 5 is a cross-sectional view showing a measurement state during processing of a product workpiece by a non-contact sensor.

FIG. 6 is a view showing an opening provided in a processing cam.

FIG. 7 is a cross-sectional view of a state in which a product work on a guide cam is measured in the upper dead center state of the upper die

FIG. 8 is a diagram showing a measurement principle of the present invention.

FIG. 9 is a diagram showing a total measurement point of a product work;

FIG. 10 is a diagram showing a residual stress of a product work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine main body 2 Lower die 3 Upper die 4 Work shaft 5 Guide cam 6 Pad 7 Processing cam 8a Curving blade key plate 8b Curving blade 9 Fixed cam 10 Fixed cam 11 Lock block 12 Opening 13 Non-contact sensor 14 Measuring machine mounting piece 15 Controller 16 PC

Claims (1)

(57) [Scope of request for utility model registration] 1. A guide cam on which a workpiece is placed and which can move forward and backward in a horizontal direction, a fixed cam arranged opposite to the guide cam, and a laser irradiator arranged toward a molding die of the guide cam. A lower die having a non-contact sensor comprising a CCD camera and a non-contact type sensor, a fixed cam for advancing the guide cam by contacting the guide cam of the lower die, and the guide by contacting the fixed cam of the lower die. An upper die having a processing cam that advances in a cam direction, the processing cam having an opening through which the laser beam of the non-contact sensor penetrates, and in which a bending blade is detachably mounted. Measuring a plurality of fixed points of the forming part of the pressed product on the guide cam by the non-contact sensor,
A residual stress analysis device for press products, which is equipped with a controller for determining the difference from the guide cam shape and the amount of springback, and a personal computer.