JP2012148355A - Method and apparatus for measuring knife gap of shearing machine - Google Patents

Abstract

A knife gap measuring method of a shearing device that can safely measure a knife gap without entering a dangerous part and has high accuracy is provided.
A measuring jig 11 having a reference surface 12a that can contact inner surfaces 4a, 3a of a fixed blade 4 or a movable blade 3 is prepared. The measurement jig 11 is detachably attached to the inner surfaces 4a and 3a of the fixed blade 4 or the movable blade 3 so that a part of the reference surface 12a of the measurement jig 11 is exposed from the fixed blade 4 or the movable blade 3. A distance a to the reference surface 12a of the measurement jig 11 is measured by a sensor 18 arranged in a direction orthogonal to a part of the reference surface 12a of the measurement jig 11. Based on the distance a to the reference surface 12a of the measurement jig 11 measured by the sensor 18, the knife gap g is calculated.
[Selection] Figure 6

Description

  The present invention relates to a knife gap measuring method and a measuring device for measuring a knife gap between an inner surface of a fixed blade of a shearing device and an inner surface of a movable blade.

  As a shearing device that shears a workpiece by moving a movable blade toward a fixed blade, shears such as an up-cut shear, a down-cut shear, a drum shear, and a trimmer that cut a steel plate are known. For example, in a steel plate factory of a steel mill that manufactures thick plates, both ends in the width direction are cut with side shears, which are down cut shears, in order to make the shape of a steel plate rolled to a predetermined thickness rectangular. Both end portions in the direction are cut with an end shear which is a down cut shear. On the other hand, in a steel plate factory of a steel mill that manufactures a thin plate, in order to cut a cut plate from a hot coil, a stop cut shear that is an up cut shear or a die cut shear that is an up cut shear is used.

  A down-cut shear, which is a kind of shearing device, includes a lower blade as a fixed blade and an upper blade as a movable blade that descends toward the fixed blade. The lower blade is fixed to the frame with its side face vertical. The upper blade is guided to be vertically slidable on the frame with its side face vertical. A steel plate is fed between a lower blade and an upper blade by a feeding device such as a table roller. When the upper blade is lowered by a driving device such as a hydraulic cylinder, a rack gear, a worm gear, or a crank mechanism, the steel plate is sandwiched between the lower blade and the upper blade and sheared.

  The factor that most affects the quality of the shear surface is the knife gap. The inner surface of the lower blade and the inner surface of the upper blade are parallel to each other with a predetermined gap, and this gap is called a knife gap. When the knife gap is too large or too small, shape failure such as leaning, burring, and mechanical cracking occurs on the shearing surface of the steel sheet, and the knife gap is adjusted to an optimum value. The optimum value of the knife gap is determined by the thickness of the steel plate, the strength of the steel plate, the temperature, and the like.

  In order to adjust the knife gap to an optimum value, it is necessary to accurately measure the knife gap. As a conventional method for measuring knife gaps, humans use a measuring instrument such as a thickness gauge, taper gauge, dial gauge, inside macrometer, cylinder gauge, etc. Methods for measuring the dimension between are known. This measurement method is a method in which a person directly measures the knife gap with a measuring tool, and enters into the apparatus and enters a narrow part. Since the shearing device is in a dangerous line or there are many dangerous parts such as openings and slippery, it is an unsafe operation with a high degree of danger. Further, since the gap value is read in a bad environment, there is a problem that measurement errors are large and there are individual differences.

  In order to solve such a problem, Patent Document 1 proposes a knife gap measuring method using a non-contact distance meter in place of dangerous knife gap measurement by hand. In Patent Document 1, a lower blade measuring distance meter and an upper blade measuring distance meter are arranged in a non-contact manner on the side of the lower blade and the side of the upper blade, and the lower blade measured by the lower blade measuring distance meter. The knife gap is measured based on the distance to the outer surface and the distance to the inner surface of the upper blade measured by the upper blade measuring distance meter. That is, the upper blade measured by the upper blade measuring distance meter is considered as the distance to the inner surface of the lower blade by adding the thickness of the lower blade to the distance to the outer surface of the lower blade measured by the lower blade measuring distance meter The knife gap is calculated by subtracting the total value from the distance to the inner surface of.

  On the other hand, Patent Document 2 discloses a method of measuring a knife gap by hand. A disk having a predetermined thickness is detachably attached to the inner surface of the lower blade using a magnet, and the outer surface of the upper blade and the circle are attached. A measuring method is described in which discs having different thicknesses are sequentially selected so that the outer surfaces of the plates are at the same level, and the knife gap is calculated from the thickness of the selected discs. For example, if the disk thickness is 10 + 0.010 mm with respect to the upper blade width of 10 ± 0 mm, the knife gap is calculated as +0.010 mm.

JP-A-6-262425 Japanese Utility Model Publication No. 57-105120

  However, in the measuring method described in Patent Document 1, the value obtained by adding the thickness of the lower blade to the distance to the outer surface of the lower blade measured by the lower blade measuring distance meter is the position of the inner surface of the lower blade. I consider it. For this reason, no matter how accurately the distance to the outer surface of the lower blade is measured, if there is an error in the thickness of the lower blade, the position of the inner surface of the lower blade cannot be measured accurately. In particular, when the lower blade is worn, the thickness of the lower blade also changes. In addition, there is a problem that two distance meters for the upper blade and the lower blade are necessary for measuring the knife gap.

  On the other hand, in the measurement method described in Patent Document 2, the work of sequentially selecting discs having different thicknesses is a troublesome work, and is a work with high risk as in the conventional manual measurement method. Become.

  Accordingly, an object of the present invention is to provide a knife gap measuring method and measuring apparatus for a shearing device that can safely measure a knife gap while reducing the risk of entering a dangerous part, and have high accuracy.

  In order to solve the above-described problem, an embodiment of the present invention provides a knife gap between an inner surface of a fixed blade and an inner surface of the movable blade in a shearing device that shears a workpiece by moving the movable blade toward the fixed blade. A measurement method having a reference surface that can contact an inner surface of the fixed blade or the movable blade, and a reference of the measurement tool from the fixed blade or the movable blade. A jig mounting step for detachably mounting the measurement jig on the inner surface of the fixed blade or the movable blade, and a direction orthogonal to a part of the reference plane of the measurement jig so that a part of the surface is exposed. A reference plane measuring step for measuring a distance to a part of the reference plane of the measuring jig by a sensor, and a knife based on the distance to a part of the reference plane of the measuring jig measured by the sensor gap A knife gap measuring method of shearing device for calculating.

  Another aspect of the present invention is a knife gap measurement for measuring a knife gap between the inner surface of the fixed blade and the inner surface of the movable blade in a shearing device that shears the workpiece by moving the movable blade toward the fixed blade. The apparatus has a reference surface that can contact the inner surface of the fixed blade or the movable blade, and is detachable from the inner surface of the fixed blade or the movable blade so that a part of the reference surface is exposed. A measuring jig to be attached, and a sensor that is arranged in a direction orthogonal to a part of the reference plane of the measuring jig and measures a distance to a part of the reference plane of the measuring jig, and the sensor measures A knife gap measuring device for a shearing device that calculates a knife gap based on a distance to a part of a reference plane of a measuring jig.

  According to the present invention, the position of the inner surface of the fixed blade is transferred to the position of the reference surface of the measurement jig (in other words, the inner surface of the fixed blade is extended to the reference surface of the measurement jig exposed from the fixed blade). Therefore, the position of the inner surface of the fixed blade can be measured by measuring the position of the reference surface of the measuring jig. For this reason, the knife gap can be accurately measured. Further, since the knife gap is measured using the sensor and the measuring jig, it is possible to measure the knife gap safely by reducing entry into a dangerous part.

Front view showing the outline of the shearing device Front view showing the positional relationship between the lower and upper blades during workpiece shearing Side view showing the positional relationship between the lower and upper blades during workpiece shearing The figure which shows a measuring jig (FIG. 4 (a) shows a side view, FIG.4 (b) shows a front view) Process drawing of the knife gap measuring method of one embodiment of the present invention ((a) in the figure shows a state in which the position of the reference plane of the measuring jig is measured, (b) in the figure measures the position of the upper blade) Shows the status) Conceptual diagram showing the principle of knife gap measurement method

  Hereinafter, a knife gap measuring device of a shearing device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a structure of a down cut shear which is an example of a shearing device, and FIG. 2 is a schematic diagram of a lower blade as a fixed blade and an upper blade as a movable blade. In FIG. 1, 1 is a down cut shear, 2 is an upper blade holder, 3 is an upper blade, 4 is a lower blade, 5 is a lower blade holder, 6 is a cutting drive device for moving the upper blade holder in the vertical direction, and 7 is A steel plate, 8 indicates a frame.

  The upper blade 3 is formed in an elongated rectangular parallelepiped shape. The upper blade 3 has a blade machined into a ridge extending in the longitudinal direction of its lower end, that is, in the blade width direction. When viewed from the front, the upper blade 3 is inclined so as to have a predetermined rake angle θ. The upper blade 3 is held on the upper blade holder 2 in a replaceable manner by a coupling means such as a bolt. A cutting drive device 6 such as a cutting cylinder device and a crank mechanism is attached to the portal frame 8, and the upper blade holder 2 is attached to the lower end of the driving device 6. The upper blade holder 2 is guided by the portal frame 8 so as to be movable in the vertical direction. The upper blade 3 held by the upper blade holder 2 is moved up and down by the drive device 6 in the vertical direction.

  The lower blade 4 is formed in an elongated rectangular parallelepiped shape. The lower blade 4 has a blade machined into a ridge extending in the longitudinal direction of the upper end, that is, the blade width direction. The lower blade 4 is held in the lower blade holder 5 in a replaceable manner by a coupling means such as a bolt. The lower blade holder 5 is fixed to the frame 8.

  A steel plate 7 is conveyed above the lower blade 4 by a feeding device (not shown). As shown in FIG. 2, when the upper blade 3 suspended upward is lowered, the steel plate 7 is sandwiched between the upper blade 3 and the lower blade 4. When the upper blade 3 is further lowered, shearing of the steel plate 7 starts as shown in FIG.

  A gap in the left-right direction between the upper blade 3 and the lower blade 4 in FIG. 3 is a knife gap g, which greatly affects the shear performance. The knife gap g is a gap between the inner surface 4a of the lower blade 4 and the inner surface 3a of the upper blade 3 which are parallel to each other. When the knife gap g is excessively large or too small, a shape defect such as bending, mechanical cracking, or the like occurs on the shear surface of the steel plate 7. For this reason, the knife gap g is adjusted to an optimum value. For that purpose, accurate measurement of the knife gap g is indispensable.

  In order to accurately measure the knife gap g, a lower blade end face zero point reset jig 11 (hereinafter simply referred to as a jig 11) is prepared as a measurement jig. The jig 11 is attached to the inner side surface 4a of the lower blade 4 and used to measure the position of the inner side surface 4a of the lower blade 4. As shown in FIG. 4, the jig 11 includes a plate-shaped jig main body 12 whose front view is formed in a rectangular shape, and a handle 13 extending in a direction orthogonal to the jig main body 12. A flat reference surface 12 a that can contact the inner surface 4 a of the lower blade 4 is formed on the jig body 12. In a state where the jig body 12 is attached to the inner side surface 4 a of the lower blade 4, a part of the reference surface 12 a of the jig body 12 is exposed from the lower blade 4. A pair of ring-shaped magnets 15 a and 15 b for detachably attaching the jig main body 12 to the lower blade 4 are embedded in the jig main body 12. The handle 13 has a small diameter portion 13b connected to the jig body 12 and a large diameter portion 13a held by an operator. In the small diameter portion 13b of the handle 13, a slit 13c extending in the longitudinal direction is formed. The slit 13c is used to arrange a sensor 18 to be described later in a direction orthogonal to the reference surface 12a of the jig body 12.

  When attaching a jig to the lower blade 4, the upper blade 3 is separated from the lower blade 4. The operator grasps the handle 13 of the jig 11 and sucks the jig main body 12 to the inner side surface 4 a of the lower blade 4. Since the inner surface 4a of the lower blade 4 and the reference surface 12a of the jig main body 12 are in contact, the position of the inner surface 4a of the lower blade 4 is transferred to the reference surface 12a of the jig main body 12. A part of the reference surface 12a of the jig body 12 is exposed from the lower blade 4, and the reference surface 12a is extended vertically upward. By measuring the horizontal position of the reference surface 12a of the jig body 12 with a sensor 18 described later, the horizontal position of the inner surface 4a of the lower blade 4 can be measured.

  FIG. 5 shows an example of a process diagram of a measuring method for measuring the knife gap g. FIG. 5 shows an example of measuring a knife gap of a side shear that cuts both ends in the width direction of a steel plate as a shearing device. The side shear is very dangerous because the knife gap measurement operation is very dangerous due to its equipment characteristics, and the measurement method of the present invention is significant.

  First, as shown to Fig.5 (a), the upper blade 3 is raised to the position of a raise limit. Then, a plate-shaped measuring steel plate 19 is placed on a table roller 20 as a feeding device and conveyed. The measuring steel plate 19 is sandwiched between pinch rollers (not shown) so that the end face in the width direction does not contact the lower blade 4. The measuring steel plate 19 is used to attach a sensor, but also serves as a scaffold for entering the line when measuring the knife gap. By using the measurement steel plate 19, there is no opening between the table rollers 20, and the measurement work can be easily performed from the measurement steel plate 19.

  Next, the jig 11 is attached to a predetermined position on the inner side surface 4 a of the lower blade 4. The operator grasps the handle 13 of the jig 11 and causes the jig main body 12 to be attracted to the inner side surface 4 a of the lower blade 4. Then, a sensor base (not shown) is fixed on the measurement steel plate 19. Here, the sensor base is positioned so that the longitudinal direction of the sensor base coincides with the longitudinal direction of the handle 13 of the jig 11 so that the sensor 18 can be arranged in a direction perpendicular to the reference surface 12a of the jig 11.

  Next, the sensor 18 is set on the sensor base. For the sensor 18, a commercially available non-contact optical sensor (for example, IL-100 manufactured by Keyence Corporation) is used for ease of setting. In addition to the optical sensor, a mechanical stroke sensor can also be used. The sensor 18 is attached to the sensor base via a commercially available magnet stand, for example.

  A plurality of sensors 18 are arranged in the longitudinal direction of the lower blade 4 (see points A to D in FIG. 1). For example, the sensor 18 is set at three points (A, B, C) during blade replacement measurement, and the sensor 18 is set at four points (A, B, C, D) during maintenance.

  Although it is ideal that the measurement direction of the sensor 18 is completely perpendicular to the reference surface 12a of the jig 11, there is no problem in accuracy if the sensor 18 is perpendicular to the approximate scale. This is because if the angle error due to the amount of division in the measurement direction of the sensor 18 is Δθ, the influence on the measured value of the knife gap g is given by 1−cos (Δθ) by simple geometry. Even if Δθ is 5 °, the influence on the knife gap g is as small as 0.4% or less.

  Next, the distance from the sensor 18 to the reference surface 12a of the jig 11 is measured. The amplifier 21 of the sensor 18 is disposed in a remote operation room such as a cab. The amplifier 21 displays a distance that is an output signal of the sensor 18. After the distance is measured by the sensor 18, if the amplifier 21 of the sensor 18 has a reset function, the display of the amplifier 21 is reset to zero. When there is no reset function, the value displayed on the amplifier 21 is recorded.

  Next, as shown in FIG. 5B, the jig 11 is removed from the lower blade 4, and the upper blade 3 is lowered to a height at which the sensor 18 can be measured. And the distance from the sensor 18 to the inner surface 3a of the upper blade 3 is measured. The value of the output signal of the sensor 18 displayed on the amplifier 21 indicates the knife gap g, and if this is recorded, the measurement operation is completed. Even when the sensor 18 does not have a reset function, the value of the knife gap g can be obtained simply by subtracting the measured value of the distance to the reference surface 12a of the jig 11 from the value displayed on the amplifier 21. Can do.

  FIG. 6 is a schematic diagram showing the relationship between the distance that is the output signal of the sensor 18 and the knife gap g. The horizontal distance from the sensor 18 to the inner surface 4a of the lower blade 4 is represented by a horizontal measurement “a” to the reference surface 12a of the jig 11. If the sensor 18 can be reset, the distance “a” = 0.

  Next, the jig 11 is removed without moving the sensor 18, and the upper blade 3 is lowered to a position where the sensor 18 can be measured. The output of the sensor 18 at this time is the distance “b” to the inner surface 3 a of the upper blade 3. The knife gap g is given by “b” − “a”. When “a” is reset to zero, “b ′” is the measurement result. As described above, by using the jig 11, the knife gap g can be accurately measured with one sensor 18.

  In order to advance further automation, a computer such as a programmable controller may be electrically connected to the amplifier 21 of the sensor 18, and a quality determination may be made as to whether or not the knife gap g is within an appropriate range using a computer not shown. In this case, an appropriate value of the knife gap is input to the computer in advance. The computer receives the knife gap g signal from the amplifier 21 of the sensor 18 and determines whether the knife gap g is within a predetermined appropriate range. The result of the quality determination is preferably displayed on a display device such as a computer touch panel. It is desirable to display the lowering amount of the upper blade 3 (which may be replaced by the protruding amount of the rod of the hydraulic cylinder that lowers the upper blade 3, the rotation angle of the crankshaft, etc.) on the display device of the computer. If the lowering amount of the upper blade 3 is displayed on the display device, it is easy to lower the upper blade 3 to a position that can be measured by the sensor 18. The measured knife gap g is preferably stored in the storage device of the computer together with the measurement points (A to D), date, and the like.

  The present invention is not limited to being embodied in the above-described embodiment, and can be variously modified without changing the gist of the present invention.

  The present invention can be applied not only to a down-cut shear but also to various shearing devices such as an up-cut shear, a drum shear, a trimmer, a side shear, a slitter, a split shear, a flying shear, an end shear, and an offline shear machine. . Moreover, it is applicable not only to a large size but also to a small size.

  The jig may be attached to the movable blade instead of the fixed blade. Further, instead of measuring the knife gap with one sensor, two sensors may be provided corresponding to each of the fixed blade and the movable blade, and the knife gap may be calculated from the output signals of the two sensors.

3 ... Upper blade (movable blade)
3a ... Inner side surface of upper blade 4 ... Lower blade (fixed blade)
4a ... Inner side surface of lower blade 11 ... Lower blade end face zero point reset jig (measuring jig)
12 ... Jig body 12a ... Reference surface 13 ... Handles 15a, 15b ... Magnet 18 ... Sensor g ... Knife gap

Claims (9)

A knife gap measuring method for measuring a knife gap between an inner surface of a fixed blade and an inner surface of a movable blade in a shearing device that shears a workpiece by moving the movable blade toward the fixed blade,
Preparing a measurement jig having a reference surface that can contact the inner surface of the fixed blade or the movable blade;
A jig attachment step for detachably attaching the measurement jig to the inner surface of the fixed blade or the movable blade such that a part of the reference surface of the measurement jig is exposed from the fixed blade or the movable blade;
A reference plane measuring step of measuring a distance to a part of the reference plane of the measurement jig by a sensor arranged in a direction orthogonal to a part of the reference plane of the measurement jig,
A knife gap measuring method of a shearing device that calculates a knife gap based on a distance to a part of a reference plane of the measuring jig measured by the sensor. In the jig attachment step, the measurement jig is detachably attached to the fixed blade,
The knife gap measuring method further includes
Removing the measuring jig from the fixed blade;
Moving the movable blade toward the fixed blade to a position where the sensor can measure the distance to the inner surface of the movable blade;
A movable blade measuring step in which the sensor measures the distance to the inner surface of the movable blade, and
The knife gap of the shearing device according to claim 1, wherein the knife gap is calculated based on a difference between a distance to a part of a reference surface of the measurement jig measured by the sensor and a distance to an inner surface of the movable blade. Measuring method. In the reference plane measurement step, after the sensor measures the distance to a part of the reference plane of the measurement jig, the display of the sensor is reset to zero,
In the movable blade measuring step, the sensor displays the distance from a part of the reference surface of the measurement jig to the inner surface of the movable blade after measuring the distance to the inner surface of the movable blade. A method for measuring a knife gap of a shearing device according to claim 2. The measuring jig is
A jig body on which a reference surface that can contact the inner surface of the fixed blade or the movable blade is formed;
A magnet for detachably attaching the jig body to the fixed blade or the movable blade;
The knife gap measuring method for a shearing device according to any one of claims 1 to 3, further comprising a handle extending in a direction orthogonal to a reference plane of the jig body. A knife gap measuring device for measuring a knife gap between an inner surface of a fixed blade and an inner surface of a movable blade in a shearing device that shears a workpiece by moving the movable blade toward the fixed blade,
A measuring jig having a reference surface that can contact the inner surface of the fixed blade or the movable blade, and detachably attached to the inner surface of the fixed blade or the movable blade so that a part of the reference surface is exposed. ,
A sensor that is arranged in a direction orthogonal to a part of the reference plane of the measurement jig, and that measures a distance to a part of the reference plane of the measurement jig,
A knife gap measuring device of a shearing device that calculates a knife gap based on a distance to a part of a reference plane of the measuring jig measured by the sensor. The measurement jig is detachably attached to the fixed blade,
The sensor measures the distance to the inner surface of the movable blade moved toward the fixed blade after removing the measurement jig from the fixed blade,
The knife gap of the shearing device according to claim 5, wherein the knife gap is calculated based on a difference between a distance to a part of a reference surface of the measurement jig measured by the sensor and a distance to an inner surface of the movable blade. measuring device. The sensor is reset so that the display of the sensor becomes zero after measuring the distance to a part of the reference plane of the measuring jig,
The said sensor displays the distance from a part of reference surface of the said measurement jig to the inner surface of the said movable blade, after measuring the distance to the inner surface of the said movable blade. Knife gap measuring device of the shearing device. The knife gap measuring device further includes
While displaying the amount of movement of the movable blade that moves toward the fixed blade,
The apparatus for measuring a knife gap of a shearing device according to claim 6 or 7, further comprising a control device that determines whether or not the calculated knife gap is within an appropriate range. The measuring jig is
A jig body on which a reference surface that can contact the inner surface of the fixed blade or the movable blade is formed;
A magnet for detachably attaching the jig body to the fixed blade or the movable blade;
The knife gap measuring device for a shearing device according to any one of claims 5 to 8, further comprising a handle extending in a direction orthogonal to a reference plane of the jig body.

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