JP2009226440A - Press machine inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine inspection device which can measure an inclination angle between a pair of pressurizing members even in a state where a measuring means is provided by only one, and to provide a press machine inspection device which can measure the inclination angle even in the case the pressurizing members move in fixed inclined posture. <P>SOLUTION: This device is used together with a pres machine provided with a pair of pressurizing members 15, 16 capable of applying a load to a workpiece so as to be closely movable along a Z axis in a state where the distance between both the pressurizing members 15, 16 can be controlled, and includes: the faces 5a to be measured vertically elongated from the pressurizing face of either pressurizing member 15 toward the pressurizing face of the other pressurizing member 16; distance measuring means 8a, 8b supported to the other pressurizing face for measuring a traverse distance to the faces 5a to be measured; and a calculating means calculating an inclination angle based on a change in the traverse distance caused by the close movement between the pair of pressurizing members 15, 16 and a change in the distance between the pair of pressurizing members 15, 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press machine inspection apparatus that uses a pair of pressure members that apply a load to a workpiece together with a press machine that is capable of moving close along the Z axis in a state in which the distance between both pressure members can be controlled. About.

  As prior art document information related to this type of press inspection apparatus, there is Patent Document 1 shown below. The apparatus described in Patent Document 1 is used together with a press provided with a slide (upper pressure member) and a bolster (lower pressure member). As means for measuring the parallelism of the slide to the bolster, linear scales capable of detecting the slide movement position are provided at the four corners of the slide. Each linear scale includes a rack gear that extends downward from a plunger that supports the slide downward, a pinion gear that is engaged with the rack gear and supported on the slide side, and four corners of the slide according to the amount of rotation of the pinion gear. And a rotary encoder that outputs a height position signal. It is said that the parallelism of the slide with respect to the bolster is derived by comparing the height position signals of the four corners at the reference position of the plunger with the height position signals of the four corners at arbitrary measurement positions of the plunger.

Japanese Examined Patent Publication No. 6-86036 (column 3, lines 20 to 40, column 4, lines 10 to 30, lines 2 and 3)

  In the press inspection apparatus described in Patent Document 1, in order to measure the inclination angle (parallelism), the height position of each part of the slide at the measurement position of the plunger is set to the height of each part of the slide at the reference position of the plunger slide. The method of comparing with the height position of is taken. For this reason, it is necessary to provide measuring means (linear scale) for measuring the height position of the slide at the reference position of the plunger and an arbitrary measuring position at at least two places (such as two of the four corners of the slide). was there. For the same reason, there is a problem that when the slider descends with a constant inclination posture with respect to the bolster, the inclination angle cannot be detected.

  Accordingly, an object of the present invention is to provide a press capable of measuring an inclination angle (parallelism) even when only one measuring means is provided, in view of the drawbacks of the conventional press inspection apparatus exemplified above. It is to provide an inspection device. Another object of the present invention is to provide a press inspection apparatus capable of measuring a tilt angle (parallelism) of a slide even when the slide descends in a constant tilt posture with respect to the bolster. is there.

The first characteristic configuration of the press inspection apparatus according to the present invention is:
Using a pair of pressure members that apply a load to the workpiece, together with a press machine that can move close along the Z axis in a state in which the distance between both pressure members can be controlled,
A surface to be measured extending vertically from one pressure surface of the pair of pressure members toward the other pressure surface of the pair of pressure members;
Ranging means supported by the other pressure surface to measure the crossing distance in the direction intersecting the Z axis to the surface to be measured;
An inclination angle between the pair of pressure members is calculated based on a change in the measured value of the crossing distance caused by the proximity movement between the pair of pressure members and a change in the distance between the pair of pressure members. And a calculating means.

  In the press inspection apparatus according to the first characteristic configuration of the present invention, if the pair of pressure members is inclined, the crossing from the surface to be measured to the distance measuring means according to the close movement of the pressure members. Since the distance value fluctuates at a constant rate, the inclination angle can be calculated from the change rate of the crossing distance. Therefore, it is possible to measure the inclination angle (parallelism) of the slide even when the slide descends with a constant inclination posture with respect to the bolster. In addition, if the inclination is related to a specific direction, the inclination angle between the pair of pressure members can be measured only by providing one measuring means. Further, it is possible to easily know how the inclination angle changes according to the progress of the proximity movement.

  Another feature of the present invention is that the distance measuring means includes at least two sensors arranged to measure the crossing distance in at least two directions that are not parallel to each other.

  If it is this structure, the inclination angle of the arbitrary directions which exist between a pair of pressurization members is measurable.

  Another feature of the present invention is that the sensor is an eddy current displacement sensor.

  With this configuration, since the eddy current displacement sensor has a small outer shape and high resolution, the press inspection apparatus can be made compact and more accurate measurement can be performed.

  Another feature of the present invention is that a second distance measuring means for measuring a distance along the Z-axis between the pressure members is provided between the pair of pressure members.

  With this configuration, the proximity movement speed between the pair of pressure members is more accurately identified by the second distance measuring means (compared to the proximity movement speed data based on the control mechanism provided in the press itself). As a result, the tilt angle can be measured more accurately.

  Another feature of the present invention is that a load meter for measuring a load applied by the pair of pressure members is provided.

  With this configuration, it is possible to measure the tilt angle when a load of various sizes is applied to the object by the press machine, so when actually processing while applying a load to the workpiece with the press machine, it is actually a phenomenon The degree of inclination to be seen and the course of change in inclination according to the increase in load can be estimated with high accuracy.

Another characteristic configuration of the present invention is a measurement lower mold provided with one of the measurement target surface and the distance measuring means, opposed to the bolster of the press machine, and opposed to the slider of the press machine, A measurement upper die provided with the other of the measurement surface and the distance measuring means; and
There is at least a pair of guide members for guiding relative movement between the measurement lower mold and the measurement upper mold between the measurement lower mold and the measurement upper mold.

  When processing a workpiece while actually applying a load with a press machine, place the workpiece inside a mold set consisting of a lower mold and an upper mold, and at least guide the relative movement between the lower mold and the upper mold In general, a pair of guide members is used. In other words, in this configuration, the press inspection machine itself has a lower mold and an upper mold that are similar to the lower mold and upper mold used for actual workpiece processing, and the relative movement between the lower measurement mold and the upper measurement mold. A mold-like structure having at least a pair of guide members for guiding is provided. Therefore, when machining a workpiece while actually applying a load with a press machine, the elements that may affect the inclination angle of the pair of pressure members (bolster and slider) are matched to the actual workpiece machining conditions. A practical inclination angle can be measured.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a state in which a press inspection apparatus 1 according to the present invention is installed in a crank press 30 (hereinafter simply referred to as a press 30) as an example of an inspection target.
The press machine 30 includes a fixed lower bolster 15 and a vertically movable slider 16 as a pair of pressure members for applying a load to the workpiece. The slider 16 is provided so as to be able to move close along the vertical axis (Z axis) in a state in which the distance to the bolster 15 can be controlled by a control device provided in the press machine 30 itself. The press inspection apparatus 1 is installed to measure the inclination angle (or parallelism) of the slider 16 with respect to the bolster 15.

  As shown in FIG. 2, the press inspection apparatus 1 includes a measuring lower die 2 as a rigid body fixed to the upper surface of the bolster 15 of the press machine 30 with a plurality of screws, and a plurality of lower surfaces of the slider of the press machine 30. A measurement upper die 3 as a rigid body fixed with screws or the like is provided. A rectangular parallelepiped pedestal 2a is integrally provided on the central upper surface of the lower mold 2 for measurement. Similarly, a rectangular parallelepiped pedestal 3 a is also provided integrally on the lower center surface of the upper measurement die 3. The lower measurement mold 2 has a flat upper surface and a lower surface that are parallel to each other, and the measurement upper mold 3 is exactly the same.

  In the vicinity of the four corners of the pedestal 2a of the lower mold 2 for measurement, a guide bar 4 (an example of a guide member) having a circular section is erected so as not to swing. On the other hand, a guide hole 3 h (an example of a guide member) having a cross-sectional shape corresponding to the cross-sectional shape of the guide rod 4 is formed in the measurement upper die 3. The upper end of the guide bar 4 is always inserted into the guide hole 3h, and can enter deeply into the guide hole 3h without showing a large resistance as the measurement upper die 3 descends.

  On the lower surface at the center of each of the four sides of the measurement upper mold 3, four rods to be measured 5 are erected so as not to swing. The rod 5 to be measured is exactly perpendicular to the lower surface of the measurement upper die 3. The rod to be measured 5 is made of a magnetic material such as iron. The rod to be measured 5 has a rectangular cross-sectional shape, and the radially outer surface thereof constitutes a particularly smooth first measured surface 5a. A smooth second measured surface 5 b is formed at the lower end of the measured rod 5. The four second measured surfaces 5 b are arranged at an equal distance from the lower surface of the measurement upper mold 3.

  Four measuring rods 7 are erected so as not to swing on the lower surfaces of the centers of the four sides of the lower mold 2. An eddy current displacement sensor 8 (an example of distance measuring means) is attached near the upper end of each measuring rod 7. Each eddy current type displacement sensor 8 forms a magnetic field, and when the distance (crossing distance in the direction intersecting the Z axis) with the closest portion of the first measured surface 5a of the opposing measuring rod 7 changes, An electric signal is output based on the disturbance of the magnetic field generated according to the degree of change. The amplitude of this output signal is proportional to the rate of change of distance. The left and right eddy current type displacement sensors 8a and 8b shown in FIG. 3 look at the transverse distance along the horizontal direction (X axis) of the press machine 30, and the upper and lower eddy current type displacement sensors 8c and 8d The crossing distance along the front-rear direction (Y-axis) of the press machine 30 is seen. The three axes of the X axis, the Y axis, and the Z axis form 90 ° with respect to each other.

  As shown in FIG. 4, the eddy current displacement sensor 8 is fixed to the measuring rod 7 by a screw 8v, and the height position can be appropriately changed. A scale (not shown) indicating the distance from the lower surface of the measurement lower mold 2 is marked on the surface of the measurement rod 7. Normally, the four eddy current displacement sensors 8 are distances from the lower surface of the measurement lower mold 2. Are fixed to be equal to each other.

  As shown in FIG. 2, a laser that optically measures the distance in the Z-axis direction to the second measured surface 5b of the measuring rod 7 on the inner side of the four measuring rods 7 of the lower measurement mold 2. An expression distance meter 6 (an example of second distance measuring means) is fixed. The laser type distance meter 6 outputs the laser beam upward, and measures the distance to the second measured surface 5b based on the time length until it is reflected by the second measured surface 5b and returned. .

  A load cell 10 (an example of a load cell) is disposed in the center of the base 2a of the lower mold 2 for measurement. The load cell 10 can continuously measure the load applied to the bolster 15 side by the slider 16 based on an electrical signal output from a strain gauge installed inside. The load cell is not limited to the load cell 10, and various means such as a strain gauge can be used as long as the load can be measured.

  As shown in FIG. 1, a measurement and collection device 20 is installed on the upper surface of the bolster 15 of the press machine 30 in a state adjacent to the press machine inspection apparatus 1. Each electrical signal output from the four eddy current displacement sensors 8, the four laser distance meters 6, and the load cell 10 is sent to the measurement collection device 20 in real time. The measurement / collection device 20 can be provided with calculation means (not shown) for calculating the tilt angle of the slider 16 relative to the bolster 15 based on these electrical signals, a monitor 20a for displaying the calculated tilt angle, and the like. .

  FIG. 4 is a schematic diagram showing the principle of the calculation method by the calculation means. FIG. 4A shows a state in which the slider 16 is in a relatively upper first position, and FIG. 4B shows a second state in which the slider 16 is lowered by a predetermined distance from the first position by the control device of the press machine 30. It is in a position. If the slider 16 is tilted clockwise by an angle θ with respect to the bolster 15 as shown in the figure, when the slider 16 is lowered from the first position to the second position, the eddy current displacement sensor 8 1 The shortest distance to the measurement surface 5a (in this case, the horizontal distance) changes from L1 to L2 (in this case, reduced).

  In the eddy current displacement sensor 8, a magnetic field is always formed, the state of the magnetic field is continuously detected, and the magnetic field also changes based on a change in the distance from L1 to L2, so the difference between L1 and L2 (L2 -L1 = ΔL). Further, the movement distance in the Z-axis direction when the slider 16 is lowered from the first position to the second position can be accurately determined based on an electric signal generated from the laser rangefinder 6. Therefore, the bolster of the slider 16 is determined based on the change (ΔL) in the transverse distance along the X-axis or the Y-axis and the descending distance of the slider 16 when the slider 16 is lowered from the first position to the second position. An inclination angle θ with respect to 15 is calculated (for example, a trigonometric function for obtaining tan-1 of a quotient obtained by dividing ΔL by a descending distance).

In this embodiment, since four eddy current displacement sensors 8 are used, the inclination in the plane including the X axis and the Z axis is determined from the average value of the inclination angles θ by the left and right eddy current displacement sensors 8a and 8b. The angle is accurately obtained, and the inclination angle in the plane including the Y axis and the Z axis is accurately obtained from the average value of the inclination angles θ by the upper and lower eddy current displacement sensors 8c and 8d.
Further, while the slider 16 is lowered over a certain distance, a change in the inclination angle θ corresponding to the lowering of the slider 16 can be obtained by obtaining the value of the inclination angle θ for each of a plurality of heights of the slider 16. Furthermore, by associating the value of the inclination angle θ with the change in load obtained by the load cell 10, the behavior of the inclination angle θ under various load conditions can be obtained.

Further, the measurement / collection device 20 holds master data of the inclination angle θ previously collected for the same press machine 30, and by an inspection in which test conditions such as the descending speed of the slider 16 are matched with those at the time of master data collection. By comparing the newly obtained value of the inclination angle θ with the master data, it is possible to know the secular change (amount of deflection, distortion, etc.) that has occurred in each part of the press machine 30.
From the output data from the four laser distance meters 6 (second distance measuring means) provided on the four sides of the lower mold 2 for measurement, four second measured surfaces 5b at the first position of the slider 16 are obtained. And the initial tilt characteristics of the slider 16 can be determined. Therefore, by using this absolute inclination characteristic as the momentary inclination characteristic obtained by the eddy current displacement sensor 8, the position of each point on the slider 16 on the Y-axis when the slider 16 is lowered. It is also possible to obtain coordinates.

[Another embodiment]
<1> The distance measuring means attached to the measuring rod 7 is not necessarily limited to the eddy current displacement sensor 8, and for example, a contact-type distance sensor that measures the crossing distance of the rod to be measured 5 to the first measured surface 5a is used. It is also possible. For example, as a contact-type distance sensor, a rotating roller supported and supported rotatably around a horizontal axis that can enter and exit in the transverse direction, a spring that urges the rotating roller to press against the first measured surface 5a, and the like. The biasing means and a mechanism for continuously detecting the position of the rotating roller in the transverse direction can be used.

<2> It is also possible to measure the tilt angle in a state where the load cell 10 is removed from the combination of the press inspection apparatus 1 shown in FIG. In this case, it is possible to measure the inclination angle of the slider 16 with respect to the bolster 15 in a state where no load is applied to the object, and the inclination is lowered while lowering the slider 16 to a lower level than when the load cell 10 is used. The angle can be measured.

<3> In the above embodiment, the four measuring rods 7 and the four eddy current displacement sensors 8 are used, but either the upper or lower eddy current displacement sensor 8 in FIG. Even if only two eddy current displacement sensors 8 including the eddy current displacement sensor 8 are used, the inclination angle of the slider 16 with respect to the bolster 15 in an arbitrary direction can be measured. Furthermore, even in a configuration in which only one eddy current displacement sensor 8 is installed, the inclination of the slider 16 with respect to the bolster 15 in a specific direction can be measured.

<4> In the above embodiment, the laser distance meter 6 that measures the distance in the Z-axis direction to the second measured surface 5 b of the measuring rod 7 is installed, and the measurement result of the same distance is obtained as the moving speed of the slider 16. Used for calculation. However, it is possible to measure the inclination angle of the slider 16 with respect to the bolster 15 based on the moving speed of the slider 16 input to the control device provided in the press machine 30 without installing the laser distance meter 6.

<5> FIG. 5 shows an application form in which a total of three press inspection apparatuses 1 are installed at the center and the left and right of the bolster 15 with respect to the press 30 larger than that shown in FIG.
In this embodiment, the load cell 10 of the same standard is arranged in the three press machine inspection devices 1 and the inspection by the three press machine inspection devices 1 is simultaneously performed while the slider 16 is lowered as usual, so that the X axis In addition, it is possible to accurately know the inclination characteristics at each point near the center, the left end, and the right end of the long slider 16. The measurement and collection device 20 is configured to process all the data output from the three press inspection devices 1 in parallel, and finally analyze and display these data comprehensively.

<6> The measurement lower die 2, the measurement upper die 3, and the guide member are not used at all, the rod 5 to be measured is fixed to the lower surface of the slider 16, and the measurement rod 7 to which the eddy current displacement sensor 8 is attached is connected to the bolster 15. The press inspection apparatus according to the present invention can be obtained even with a configuration that is fixed to the upper surface of the press. The rod to be measured 5 and the measuring rod 7 can be fixed by a pedestal with a strong magnet provided at the base end of each rod.

The front view of the press machine which installed the press machine inspection apparatus by this invention Enlarged front view showing the press inspection device FIG. 2 is a partially broken plan view showing the press inspection apparatus of FIG. Schematic showing the calculation principle of the tilt angle Front view showing another application example of the press machine inspection device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press machine inspection apparatus 2 Lower measurement mold 2a Pedestal part 3 Upper measurement mold 3a Pedestal part 3h Guide hole (guide member)
4 Guide rod (guide member)
5a First surface to be measured 5b Second surface to be measured 6 Laser distance meter (second distance measuring means)
8 Eddy current displacement sensor (ranging means)
10 Load cell
15 Bolster (lower pressure member)
16 Slider (Upper pressure member)
20 Measurement and collection device 30 Crank press machine

Claims (6)

Using a pair of pressure members that apply a load to the workpiece, together with a press machine that can move close along the Z axis in a state in which the distance between both pressure members can be controlled,
A surface to be measured extending vertically from one pressure surface of the pair of pressure members toward the other pressure surface of the pair of pressure members;
Ranging means supported by the other pressure surface to measure the crossing distance in the direction intersecting the Z axis to the surface to be measured;
An inclination angle between the pair of pressure members is calculated based on a change in the measured value of the crossing distance caused by the proximity movement between the pair of pressure members and a change in the distance between the pair of pressure members. A press machine inspection device.   2. The press inspection apparatus according to claim 1, wherein the distance measuring means includes at least two sensors arranged to measure the crossing distance in at least two directions that are not parallel to each other.   The press inspection apparatus according to claim 2, wherein the sensor is an eddy current displacement sensor.   4. The second distance measuring means for measuring a distance along the Z-axis between the pressure members is provided between the pair of pressure members. 5. Press machine inspection device.   The press inspection apparatus according to any one of claims 1 to 4, further comprising a load meter that measures a load applied by the pair of pressure members. A lower measurement die having one of the measurement target surface and the distance measuring means facing the bolster of the press machine, and a slider of the press machine, facing the measurement target surface and the distance measuring means. A measuring mold with the other, and
6. The apparatus according to claim 1, further comprising at least a pair of guide members for guiding relative movement between the measurement lower mold and the measurement upper mold between the measurement lower mold and the measurement upper mold. The press inspection apparatus as described.

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