JP2008142803A - Positioning clamping method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positioning clamping device which copes with a plurality of workpieces having locating holes having different diameters by using one positioning clamping device, and removes a workpiece from a locating pin easily even when positioning the workpiece in a plurality of sections. <P>SOLUTION: A first locating hole fitting part 14b and a second locating hole fitting part 14c being different from each other in thickness are formed in the locating pin 7. When positioning the workpiece W by fitting the second locating hole fitting part 14c into the locating hole 16 having large diameter of the workpiece W and using two cylinders 3, 4 for shift having different strokes S1 and S2 respectively, the locating pin 7 is pushed out by the stroke S2 and fitted, and is pulled back by difference between the stroke S2 and the stroke S1 to release its fitting. When positioning the workpiece W by fitting the first locating hole fitting part 14b into the locating hole 16 having small diameter, the locating pin 7 is pushed out by the stroke S1, is fitted, and is pulled back by only the same stroke S1 to release its fitting into the locating hole 16 having small diameter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a positioning clamp method and apparatus for positioning and clamping a workpiece such as a plate material when processing such as welding, and more specifically, a locate hole provided in a workpiece by shifting a locate pin with a shift cylinder. The present invention relates to a positioning and clamping method and apparatus for positioning a workpiece by fitting the clamp arm with a locating pin, inserting a clamp arm with a locating pin into a locating hole, and driving the clamp arm with a clamping cylinder to clamp the workpiece.

  In this type of positioning clamp device, as shown in FIG. 19A, the workpiece 51A is fitted into the plurality of locating holes 52A of the workpiece 51A, which is a plate material, so that the outer peripheral surface of the locating pin 53A is in contact therewith. If the workpiece 51A is to be removed from the locating pin 53A, it is difficult to remove the workpiece 51A because the locating pin 53A is fitted in the locating hole 52A at a plurality of locations. It was necessary to retract 53A to release the fitting with the locate hole 52A.

  In addition, as shown in FIG. 19B, when the diameter of the plurality of locate holes 52B is a work 51B different from the work 51A shown in FIG. 19A, a locate pin 53B corresponding to the diameter of the locate hole 52B is provided. It was necessary to prepare a separate positioning clamp device.

  In response to the former problem, for example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-263858), an eject pin that can be projected and retracted from a workpiece seating surface by a cylinder is built in the locate pin side. A structure that pushes and moves the workpiece toward the tip of the locating pin by projecting and moving from the seating surface, and a structure that consists of a seating flange with the workpiece seating surface, and the locating pin is simply raised and lowered with the cylinder device. Is disclosed.

  With respect to the latter problem, for example, in the one described in Patent Document 2 (Japanese Patent Application Laid-Open No. 9-192968), the tip of the locating pin that protrudes from the work contact surface (work seating surface) of the locating pin presser has a large diameter. Two fitting parts with different outer diameters are formed, and the locating pin is operated by the locating pin driving cylinder so that the locating pin protrudes and retracts from the tip of the locating pin presser, thereby fitting with the workpiece positioning hole. The large diameter part and the small diameter part of the locate pin can be switched.

However, the thing of patent document 1 does not cope with the case where the diameter of a locate hole differs.
On the other hand, although the thing of patent document 2 copes with the case where the diameter of a locating hole differs, when the large diameter part of a locating pin is fitted and positioned in the positioning hole of a workpiece | work, and a small diameter part is fitted. In any case, the workpiece is only released from the clamping device by releasing the clamp by the clamp arm.
JP 2006-263895 A JP 9-192968 A

  Therefore, the problem of the present invention is that the locating pin itself is advanced and retracted in two stages, so that even in the case of a workpiece having a different locating hole diameter, the same positioning clamp device having a locating pin corresponding to the hole diameter can be prepared. It can be easily handled by the positioning clamp device, and also when positioning at multiple locations by fitting locating pins to multiple locating holes in the workpiece, by retracting the locating pins and releasing the fitting with the locating holes, It is an object of the present invention to provide a positioning clamp method and apparatus capable of easily removing a workpiece from a locating pin.

According to the first aspect of the present invention, the work piece is positioned by shifting the locating pin with the shift cylinder and fitted in the locating hole provided in the work, and the clamp arm is inserted into the locating hole together with the locating pin, In the positioning clamp method of driving a clamp arm with a clamping cylinder and clamping a workpiece,
First, at least two locate hole fitting portions having different thicknesses are formed on the locate pin,
The stroke of pushing and retracting the locating pin by the shift cylinder can be changed in two stages,
When the first locating hole fitting portion having a small thickness of the locating pin is fitted into the locating hole, the locating pin is pushed out by a short stroke S1 and fitted into the locating hole, while the locating pin is pulled back by the stroke S1 to locate the locating hole. Release the mating with
When fitting the second locating hole fitting part where the thickness of the locating pin is thick into the locating hole, the locating pin is pushed out to the long stroke S2 and fitted to the locating hole, while the locating pin is pulled back to the short stroke S1. Release the fitting with the locate hole,
It is characterized by that.

  The invention according to claim 2 uses two shift cylinders having different strokes to vary the push / pull back stroke of the locate pin in two stages.

  The invention according to claim 3 is a case where two such shift cylinders are used, and when the first locate hole fitting portion where the thickness of the locate pin is thin is fitted to the locate hole, a short stroke is required. The locating pin is pushed out by the first shifting cylinder of S1 and fitted into the locating hole, while the locating pin is pulled back by the second shifting cylinder of long stroke S2 to release the fitting, and the second thicker When the locating hole fitting portion is fitted into the locating hole, the locating pin is separated from the first shifting cylinder by the second shifting cylinder having the long stroke S2 and further pushed out to be fitted into the locating hole. On the other hand, the locating pin is pulled back by the stroke difference (S2-S1) from the first shift cylinder by the second shift cylinder to release the fitting.

  In the present invention according to claim 4, the stroke S2 is twice the stroke S1.

The present invention according to claim 5 includes a locating pin that fits into a locating hole provided in a work and positions the work, a shift cylinder mechanism that pushes and retracts the locating pin, and a clamp that is inserted into the locating hole together with the locating pin In a positioning clamp device having a clamp cylinder for driving an arm to clamp a workpiece,
The locating pin is formed with first and second locating hole fitting portions having different thicknesses, and the shift cylinder mechanism includes first and second shifting cylinders having different strokes,
When the first locating hole fitting portion having the thin locating pin is fitted to the locating hole, the locating pin is pushed out by the first shift cylinder of the short stroke S1 and fitted to the locating hole, while the long stroke When the locating pin is pulled back by the second shifting cylinder of S2 to release the fitting, and the second locating hole fitting portion having a large thickness is fitted to the locating hole, the second shift of the long stroke S2 is performed. The locating pin is separated from the first shift cylinder by the cylinder and further pushed out and fitted into the locating hole, while the second shift cylinder has a stroke difference (S2− from the first shift cylinder). Pull back the locate pin only for S1) to release the fitting.
It is characterized by

  The invention according to claim 6 is characterized in that the first shift cylinder and the second shift cylinder are juxtaposed on both sides of the clamp cylinder.

  The invention according to claim 7 is further characterized in that a clamping cylinder, a first shift cylinder, and a second shift cylinder are incorporated in a common cylinder body.

  According to an eighth aspect of the present invention, the shift cylinder mechanism includes a connecting member connected to the locating pin, and the piston rod of the second shifting cylinder is connected to the connecting member, whereas the first shifting gear mechanism is used. The piston rod of the cylinder is detachably abutted with the connecting member.

  According to the first and fifth aspects of the present invention, a plurality of locating hole fitting portions having different thicknesses are formed on the locating pin, and the amount of protrusion of the locating pin from the workpiece seating surface is two-staged by the shift cylinder. Since it can be changed, it is possible to easily cope with workpieces having different locating hole diameters by the same positioning clamp device. Also, when positioning by positioning the locating holes in the locating holes at multiple locations on the workpiece, even if the locating holes have dimensional tolerances etc., the locating pins will be retracted to release the locating holes. Thus, the workpiece can be easily removed from the locate pin, and even a workpiece having low rigidity can be removed without being deformed.

  According to the second aspect of the present invention, it is possible to easily realize the operation of changing the stroke of pushing and retracting the locating pin in two stages by using two shift cylinders having different strokes.

  According to the invention of claim 3, when the locating pin is released from the locating pin by releasing the fitting of the locating pin to the locating hole, even if the locating pin is fitted to any of the large and small locating holes, the fitting is released. This can be done quickly and efficiently by the cooperation of two shift cylinders with different strokes.

  According to the invention of claim 4, since the stroke S2 is twice the stroke S1, the locating pin can be fitted to and released from the locating hole at the same time regardless of the diameter of the locating hole. When the same workpiece is provided with large and small locating holes and the locating pins are fitted to each of the workpieces for positioning at a plurality of locations, the positioning can be easily performed simultaneously.

  According to the invention of claim 6, since the first shift cylinder and the second shift cylinder are juxtaposed on both sides of the clamp cylinder, the locating pin pushing / retracting stroke can be varied in two stages. Even if it exists, the full length of the whole apparatus does not become long.

  According to the seventh aspect of the present invention, since the three cylinders are incorporated in the common cylinder body, the size of the entire apparatus can be increased even in a structure in which the stroke of pushing / retracting the locating pin is variable in two stages. Can be suppressed.

  According to the eighth aspect of the present invention, only the second shift cylinder having a long stroke is always connected to the locate pin, and the first shift cylinder having a short stroke is separated from the locate pin. Can be realized with a simple configuration.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

The outer surface of this positioning clamp apparatus is shown in FIGS.
A main body 1 of the positioning clamp device includes a cylinder body portion 1a as a lower portion, a hollow pedestal portion 1b as an intermediate portion, and a hollow work seating portion 1c as an upper portion. The portion 1b is a box shape that is continuous with a rectangular section having substantially the same size, but the workpiece seating portion 1c is a cylindrical shape that protrudes from the center of the upper surface of the cradle portion 1b.

5 to 8 show cross sections of this positioning clamp device. 9 is a cross-sectional view taken along the line CC in FIG.
The cylinder body 1a is a body common to the three cylinders of the center clamping cylinder 2 and the first shift cylinder 3 and the second shift cylinder 4 that are arranged in parallel on the left and right sides thereof. These three cylinders 2, 3 and 4 are all cylindrical on the inner surface, and each of the two ports 2a, 2b, 3a, 3b, 4a and 4b (see FIG. 4) is opened on the bottom surface of the cylinder body 1a. However, the three cylinders 2, 3, 4 are separated from each other by a partition in the cylinder body 1 a, and the head covers 2 c, 3 c, 4 c and rod covers 2 d, 3 d, 4 d, piston 2 e for each cylinder. 3e, 4e and piston rods 2f, 3f, 4f. Two ports 2a, 2b, 3a, 3b, 4a, 4b are connected to the rod side piston chamber and the other to the head side piston chamber in each cylinder 2, 3, 4; The supply / discharge of the pressure medium (compressed air) to / from the cylinder can be switched by a switching valve for each of the cylinders 2, 3, and 4. The cylinders 2, 3 and 4 can control the variable speed of each cylinder by controlling the flow rate of the pressure medium with a variable flow rate control valve (not shown). Instead of variable flow rate control, constant speed control using an orifice or the like may be used.

  The clamping cylinder 2 has a piston rod 2f whose tip is connected to a pair of clamp arms 5 and 6 in a cylindrical shaft portion 7a of the locating pin 7 by a connecting pin 8, and the clamp arms 5 and 6 are reciprocally slidable by the piston 2e. The fulcrum pin 9 is opened and closed by the movement. 10 is a cross-sectional view taken along the line DD in FIG. 5 along the connecting pin 8, and FIG. 11 is a cross-sectional view taken along the line EE in FIG. 5 along the fulcrum pin 9.

  The stroke S2 of the piston 4e of the second shift cylinder 4 is longer than the stroke S1 of the piston 3e of the first shift cylinder 3. Moreover, the piston rod 3f of the first shift cylinder 3 only enters the hollow portion 10 of the cradle 1b and is not connected to the locate pin 7, whereas the piston rod 3f of the second shift cylinder 4 is not connected. The rod 4f is longer than the piston rod 3f of the first shift cylinder 3, and is connected to the locating pin 7 in the hollow portion 10 of the cradle 1b as follows.

  That is, a connecting member 11 having a cross-sectional shape as shown in FIG. 12 is connected to the base end of the locating pin 7 so as to be orthogonal to the axis of the locating pin 7, and one end of the connecting member 11 and the piston rod 4 f are connected to the bolt 12. The piston rod 4f and the locating pin 7 move together. At that time, the cylindrical shaft portion 7a of the locating pin 7 slides along a guide hole 13 formed continuously in the cradle portion 1b and the workpiece seating portion 1c. With this configuration, the connecting member 11 moves up and down by the piston rod 4f. At this time, the cylindrical shaft portion 7a of the locating pin 7 that slides along the guide hole 13 serves as a guide in a direction orthogonal to the axial direction. Deviations and tilts are prevented.

  The connecting member 11 is not connected to the piston rod 3f of the first shift cylinder 3, but extends to the extension line thereof. Therefore, when the connecting member 11 moves within the stroke range, the tip of the piston rod 3f is connected to the connecting member 11. The connecting member 11 can be pushed by the piston rod 3 f in a state where it is in contact with 11. At this time, since the displacement and inclination of the connecting member 11 are prevented as described above, even if the contact portion between the tip of the piston rod 3f and the connecting member 11 is biased to one side of the connecting member 11, the connecting member 11 Is pushed straight without shifting or tilting in a direction perpendicular to the axial direction.

  The pair of clamp arms 5 and 6 have their required length portions including the tip flange portions 5a and 6a entered into the slit 7c formed in the head portion 7b of the locate pin 7 so as to cross within the slit 7c. It has become.

  As shown in FIG. 6, the head portion 7 b of the locating pin 7 has a truncated cone-shaped locating hole guide portion 14 a, a first locating hole fitting portion 14 b that is thicker (the outer diameter is larger), and further, A thick (further outer diameter) second locate hole fitting portion 14c is formed in a stepwise fashion from the distal end to the proximal end. The surface of the first locating hole fitting portion 14b and the second locating hole fitting portion 14c is changed in surface roughness or splined according to the material and thickness of the work, the hole diameter of the locating hole, etc. Thus, the contact resistance can be reduced, and the locating pin 7 can be smoothly fitted and pulled out.

  On the other hand, a seating ring 15 is fixed to the tip of the workpiece seating portion 1c, and the upper surface of the seating ring 15 becomes a seating surface 15a for the workpiece.

Next, the operation of the positioning clamp device configured as described above will be described.
13 to 15 show an operation when the diameter of the locate hole 16 of the workpiece W is large, FIG. 13 is a clamped state in which the workpiece W is clamped, FIG. 14 is an unclamped state in which the clamp is released, and FIG. The workpiece is released from W.

  In the case of FIG. 13, the switching valves 17 and 18 are set so that the head side piston chambers of both the first and second shift cylinders 3 and 4 are pressurized and the rod side piston chambers are exhausted. When the pistons 3e and 4e are slid to the rod side, the stroke S2 of the second shift cylinder 4 is longer than the stroke S1 of the first shift cylinder 3 (in this example, twice the S1). The connecting member 11 is further propelled by the piston rod 4f of the second shift cylinder 4 even after being separated from the piston rod 3f of the first shift cylinder 3. As a result, the locating pin 7 is pushed out by the stroke of the piston rod 4f of the second shift cylinder 4, and the second locating hole fitting portion 14c of the head portion 7b of the locating pin 7 is moved to the large diameter locating hole of the workpiece W. 16 and the workpiece W is positioned.

  Thereafter, when the switching valve 19 is set so that the rod-side piston chamber of the clamping cylinder 2 is pressurized and the head-side piston chamber is exhausted, and the piston 2e is slid to the head side, the pair of clamp arms 5 6 opens to each other while being pulled by the piston rod 2 f and presses the peripheral portion of the locating hole 16 of the workpiece W against the seating surface 15 a of the seating ring 15 to clamp the workpiece W.

  In the case of FIG. 14, the switching valves 17 and 18 of both the first and second shift cylinders 3 and 4 are left as they are, the switching valve 19 is switched, the head side piston chamber of the clamping cylinder 2 is pressurized, the rod side When the piston chamber is evacuated and the piston 2e is slid to the rod side, the pair of clamp arms 5 and 6 are closed to each other while being pushed by the piston rod 2f, and the workpiece W is clamped.

  In the case of FIG. 15, the switching valve 19 of the second shift cylinder 4 is switched while the switching valve 19 of the clamping cylinder 2 and the switching valve 17 of the first shift cylinder 3 are left unchanged, and the rod side piston chamber is pressurized. When the head side piston chamber is exhausted, the connecting member 11 is pulled back by the piston rod 4f. However, since the piston rod 3f of the first shifting cylinder 3 remains at the rod side stroke end, the connecting member 11 It stops when it comes into contact with the tip of the rod 3f.

  Therefore, the locating pin 7 is pulled back by the difference in length (S2-S1) between the stroke S1 of the first shifting cylinder 3 and the stroke S2 of the second shifting cylinder 4, and the second locating hole fit of the locating pin 7 is performed. The mating portion 14c is retracted from the large-diameter locating hole 16 of the workpiece W and is unfitted with it. By controlling the reverse speed, the locate pin 7 can be smoothly pulled out from the locate hole 16. Thereafter, if the workpiece W is moved in the axial direction of the locate pin 7, it can be easily detached from the locate pin 7.

  16 to 18 show the operation when the diameter of the locate hole 16 of the workpiece W is small. FIG. 16 is a clamped state in which the workpiece W is clamped, FIG. 17 is an unclamped state in which the clamp is released, and FIG. The workpiece is released from W.

  In the case of FIG. 16, the first shift cylinder 3 is pressurized in the head side piston chamber, the rod side piston chamber is exhausted, and the second shift cylinder 4 is exhausted in the head side piston chamber, and the rod side piston chamber is pressurized. When the switching valves 17 and 18 are set as described above, the first shift cylinder 3 slides the piston 3e toward the rod side, while the second shift cylinder 4 moves the piston 4e toward the head side. Therefore, the connecting member 11 stops at an intermediate position of the second shift cylinder 4 that contacts the tip of the piston rod 3 f of the first shift cylinder 3. As a result, the first locate hole fitting portion 14b of the head portion 7b of the locate pin 7 is fitted into the small diameter locate hole 16 of the workpiece W, and the workpiece W is positioned.

  Thereafter, when the switching valve 19 is set so that the rod-side piston chamber of the clamping cylinder 2 is pressurized and the head-side piston chamber is exhausted, and the piston 2e is slid to the head side, the pair of clamp arms 5 6 opens to each other while being pulled by the piston rod 2 f and presses the peripheral portion of the locating hole 16 of the workpiece W against the seating surface 15 a of the seating ring 15 to clamp the workpiece W.

  In the case of FIG. 17, the switching valves 17 and 18 of both the first and second shift cylinders 3 and 4 remain unchanged, the switching valve 19 is switched, the head side piston chamber of the clamping cylinder 2 is pressurized, and the rod side When the piston chamber is evacuated and the piston 2e is slid to the rod side, the pair of clamp arms 5 and 6 are closed to each other while being pushed by the piston rod 2f, and the workpiece W is clamped.

  In the case of FIG. 18, the switching valve 19 of the first shifting cylinder 3 and the switching valve 18 of the second shifting cylinder 4 are switched while the switching valve 19 of the clamping cylinder 2 is left as it is, and the rod side piston chambers are changed. When the pressure and the head side piston chamber are exhausted, the pistons 3e and 4e slide from the position shown in FIG. 17 to the head side stroke end.

  Thereby, the locating pin 7 is pulled back by the stroke S1, and the first locating hole fitting portion 14b is retracted from the small diameter locating hole 16 of the workpiece W to be disengaged from it. Thereafter, if the workpiece W is moved in the axial direction of the locate pin 7, it can be easily detached from the locate pin 7. Also in this case, the locating pin 7 can be smoothly pulled out from the locating hole 16 by controlling the speed.

  As shown in FIGS. 13 to 15, when the workpiece W is positioned by fitting the second locate hole fitting portion 14 c of the locate pin 7 to the hole diameter of the locate hole 16 of the workpiece W, the locate pin 7 is pushed to the stroke S2 and fitted, and the difference between the stroke S2 and the stroke S1 is pulled back to release the fitting with the large-diameter locating hole 16, whereas as shown in FIGS. When positioning the workpiece W by fitting the first locate hole fitting portion 14b of the locate pin 7 to the small diameter of the locate hole 16 of the workpiece W, the locate pin 7 is pushed out to the stroke S1 and fitted. The same stroke S1 is pulled back to release the small diameter locating hole 16, but in this example, since S2 is twice S1, the difference between them is S1. Are the same, the stroke of the latter and the former case is the same S1.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to this, It can apply in a range which does not deviate from the summary. For example, in the embodiment, an example in which the first and second two-stage locating hole fitting portions 14b and 14c are provided is shown, but the number of locating hole fitting portions is not limited to this.

  Further, according to the present invention, the locating pin pushing / retracting stroke by the shift cylinder can be varied in two stages, so that the locating pin operating position is 3 positions. Therefore, in FIG. 6, the locating pin 7 has a small diameter. If the hole guide portion 14a is also used as a locate hole fitting portion to be fitted to the locate hole, it can cope with three types of large, medium and small locate holes. Therefore, conventionally, three types of positioning clamp devices having different locating pin diameters are required for workpieces having different locating hole diameters, large, medium and small. According to the present invention, one positioning clamping device is required. It is possible to cope with.

It is a front view of the positioning clamp apparatus which is one Example of this invention. It is a side view similarly. It is a top view similarly. It is a bottom view similarly. It is sectional drawing along the AA line of FIG. It is a sectional view which followed the BB line similarly. It is the top view which saw through a part. It is the bottom view which saw through a part. It is sectional drawing along CC line of FIG. It is a sectional view which followed the DD line similarly. It is sectional drawing which followed the EE line. It is sectional drawing which followed the FF line similarly. It is a simplified sectional view showing operation when the diameter of a locating hole of a work is large, and is a clamp state which clamps a work. Similarly, it is an unclamped state in which the clamp is released. Similarly, the workpiece is released from the workpiece. It is a simplified sectional view showing operation when the diameter of a locating hole of a work is small, and is a clamp state which clamps a work. Similarly, it is an unclamped state in which the clamp is released. Similarly, the workpiece is released from the workpiece. It is a perspective view which shows that a locating pin is fitted to a plurality of locating holes of a work, and a work is positioned in a plurality of places, and shows a work from which the hole diameter of a locating hole differs in the case of (A) and (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1a Cylinder body part 1b Base part 1c Work seat part 2 Clamping cylinder 3 1st shift cylinder 4 2nd shift cylinder 2a * 2b, 3a * 3b, 4a * 4b Port 2c, 3c, 4c Head cover 2d, 3d, 4d Rod cover 2e, 3e, 4e Piston 2f, 3f, 4f Piston rod 5 and 6 Clamp arm 7 Locating pin 7a Cylindrical shaft portion 7b Head portion 7c Slit 8 Connecting pin 9 Supporting pin 10 Hollow portion 11 Connecting member 12 Bolt 13 Guide Hole 14a Locate hole guide portion 14b First locate hole fitting portion 14c Second locate hole fitting portion 15 Seating ring 15a Seating surface 16 Locate hole W Workpiece

Claims (8)

The locating pin is shifted by the shift cylinder and fitted into the locating hole provided in the work, and the work is positioned. The clamp arm is inserted into the locating hole together with the locating pin, and the clamp arm is driven by the clamping cylinder. In the positioning clamp method for clamping the workpiece,
First and second at least two locate hole fitting portions having different thicknesses are formed in the locate pin,
The stroke of pushing / retracting the locating pin by the shift cylinder can be varied in two stages,
When the first locating hole fitting portion having a small thickness of the locating pin is fitted into the locating hole, the locating pin is pushed out by a short stroke S1 and fitted into the locating hole, while the locating pin is pulled back by the stroke S1 to locate the locating hole. Release the mating with
When fitting the second locating hole fitting part where the thickness of the locating pin is thick into the locating hole, the locating pin is pushed out to the long stroke S2 and fitted to the locating hole, while the locating pin is pulled back to the short stroke S1. Release the fitting with the locate hole,
A positioning clamp method characterized by that.   2. The positioning clamp method according to claim 1, wherein two locating cylinders having different strokes are used to vary the locating pin pushing / retracting stroke in two stages.   When the first locating hole fitting portion having the thin locating pin is fitted to the locating hole, the locating pin is pushed out by the first shift cylinder of the short stroke S1 and fitted to the locating hole, while the long stroke When the locating pin is pulled back by the second shifting cylinder of S2 to release the fitting, and the second locating hole fitting portion having a large thickness is fitted to the locating hole, the second shift of the long stroke S2 is performed. The locating pin is separated from the first shift cylinder by the cylinder and further pushed out and fitted into the locating hole, while the second shift cylinder has a stroke difference (S2− from the first shift cylinder). The positioning clamp method according to claim 2, wherein the locating pin is pulled back by S1) to release the fitting.   4. The positioning clamp method according to claim 1, wherein the stroke S2 is twice the stroke S1. A locating pin that fits into a locating hole provided in the work and positions the work, a shift cylinder mechanism that pushes and retracts the locating pin, and a clamp arm that is inserted into the locating hole together with the locating pin are driven to clamp the work. In a positioning clamp device having a clamping cylinder,
The locating pin is formed with first and second locating hole fitting portions having different thicknesses, and the shifting cylinder mechanism is provided with first and second shifting cylinders having different strokes. ,
When the first locating hole fitting portion having the thin locating pin is fitted to the locating hole, the locating pin is pushed out by the first shift cylinder of the short stroke S1 and fitted to the locating hole, while the long stroke When the locating pin is pulled back by the second shifting cylinder of S2 to release the fitting, and the second locating hole fitting portion having a large thickness is fitted to the locating hole, the second shift of the long stroke S2 is performed. The locating pin is separated from the first shift cylinder by the cylinder and further pushed out and fitted into the locating hole, while the second shift cylinder has a stroke difference (S2− from the first shift cylinder). Pull back the locate pin only for S1) to release the fitting.
A positioning clamp device characterized by that.   6. The positioning clamp device according to claim 5, wherein the first shift cylinder and the second shift cylinder are juxtaposed on both sides of the clamp cylinder.   7. The positioning clamp device according to claim 6, wherein the clamp cylinder, the first shift cylinder, and the second shift cylinder are incorporated in a common cylinder body.   The shift cylinder mechanism includes a connecting member connected to the locating pin, and the piston rod of the second shift cylinder is connected to the connecting member, whereas the piston rod of the first shift cylinder is connected to the connecting member. The positioning clamp device according to claim 5, wherein the positioning clamp device is detachably abutted with the positioning clamp device.

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