JP2006043808A - Work positioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work positioning device, positioning a work with high accuracy in simple constitution. <P>SOLUTION: With the work positioning pin 31 inserted in a work positioning hole 53 of a work 51, high pressure fluid is supplied from a supply source P to an opening part 42 in the outer peripheral surface of the work positioning pin 31, and injected radially from the outer peripheral surface of the work positioning pin 31. Thus, in the case where the center of the work positioning hole 43 is biased to the work positioning pin 31, the work 51 is moved in the direction where the center of the work positioning hole 53 is aligned with the center of the work positioning pin 31, and stopped in a position where the center of the work positioning hole 53 is aligned with the center of the work positioning pin 31 to thereby positioning the work 51 with high accuracy. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a workpiece positioning device for positioning a workpiece with respect to a mounting table by inserting a workpiece positioning pin protruding from the upper surface of the mounting table on which the workpiece is placed into a workpiece positioning hole provided in advance on the lower surface of the workpiece. .

  For example, when performing precise machining on a workpiece by grinding or the like, it is necessary to position the workpiece with respect to the mounting table, and a workpiece positioning pin is used as one of the positioning methods.

  FIG. 6 is a diagram for explaining the first prior art. As shown in FIG. 6, the workpiece positioning pin 101 is erected on the upper surface 102 a of the mounting table 102 on which the workpiece 111 is placed. The work positioning pin 101 has a cylindrical shape extending in the vertical direction with a constant diameter, and its upper end is formed in a tapered cone shape so that the diameter gradually decreases as it moves upward.

  When the workpiece 111 is set on the mounting table 102, the workpiece 111 can be positioned relative to the mounting table 102 by being inserted into the workpiece positioning hole 112 formed in the lower surface 111a of the workpiece 111. It is configured. The workpiece positioning pin 101 is provided between the inner peripheral surface of the workpiece positioning hole 112 and the outer peripheral surface of the workpiece positioning pin 101 in an inserted state in order to facilitate workability when the workpiece 111 is set and removed. The diameter dimension is set to have a clearance of.

  9 and 10 are diagrams for explaining the second prior art.

  As shown in FIGS. 9 and 10, the work positioning pin has a through hole 122 formed in the center of the work positioning pin 121 and four slits 123 cut out from the upper end to the lower end of the work positioning pin 121. Is formed. Then, with the workpiece positioning pin 121 inserted into the workpiece positioning hole 132 of the workpiece 131, the diameter increasing member 124 is inserted into the through hole 122 from below the workpiece positioning pin 121 to increase the diameter of the workpiece positioning pin 121. Thus, the outer peripheral surface of the workpiece positioning pin 121 can be pressed against the inner peripheral surface of the workpiece positioning hole 132, the workpiece 131 can be positioned with zero clearance, and when the workpiece 131 is removed, the diameter-expanding member 124 is penetrated. The workpiece positioning pin 121 is extracted from the hole 122 to form a clearance so that a clearance is formed, and the workpiece 131 can be easily removed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-39787

  However, in the case of the first prior art, as shown in FIG. 7A which is a cross-sectional view taken along line XX of FIG. 6, there is a clearance between the work positioning pin 101 and the work positioning hole 112, As shown in FIG. 7B, a variation h1 corresponding to the clearance occurs.

  This variation h1 can be eliminated by pressing the workpiece 111 toward one side in the horizontal direction during positioning when the hole diameters of the workpiece positioning holes 112 formed in the workpiece 111 are all constant. .

  However, in reality, manufacturing tolerances exist, and the diameters of the workpiece positioning holes 112 cannot be made constant. For this reason, as shown in FIG. 8, variation (h2 ≠ h3) occurs in the positioning of the workpiece 111 according to the difference in the hole diameter of the workpiece positioning hole 112, and the workpiece 111 cannot be positioned with high accuracy. In FIG. 8, reference numerals 112 ′ and 112 ″ indicate two types of workpiece positioning holes having different hole diameters due to tolerances.

  In the case of the second prior art, as shown in FIG. 9, in addition to the work positioning pin 121, an enlarged member 124 and an actuator (not shown) for moving the enlarged member 124 are required. There are many points and the control becomes complicated. Moreover, since it has a movable part, its durability is low, it is necessary to keep spare parts in stock, and regular maintenance work is required. And as shown in FIG. 10, it is necessary to form the slit 123 in the workpiece | work positioning pin 121, and a fine process is requested | required for manufacture of an apparatus. Therefore, there is a concern that the cost will rise.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a workpiece positioning device capable of positioning a workpiece with high accuracy with a simple configuration.

  According to the first aspect of the present invention, there is provided a mounting table having an upper surface on which the workpiece is placed, a workpiece that protrudes upward from the upper surface of the mounting table, and is formed in advance on the lower surface of the workpiece by approaching the workpiece from above. A workpiece positioning pin that can be inserted into the positioning hole, a plurality of outer circumferential surface openings formed at equal intervals in the circumferential direction on the outer circumferential surface of the workpiece positioning pin, and one end at each outer circumferential surface. Centering means having a supply passage for centering that communicates with the opening and has the other end connected to a high pressure fluid supply source, and when the work positioning pin is inserted into the work positioning hole, There is a gap between the peripheral surface and the outer peripheral surface of the workpiece positioning pin, and the workpiece position is inserted from each outer peripheral surface opening with the workpiece positioning pin inserted into the workpiece positioning hole. Center of the workpiece positioning holes on the upper surface of the mounting table workpiece by jetting high-pressure fluid toward the radially outer side of the decided pin and moving the position corresponding to the center of the work positioning pins.

  According to a second aspect of the present invention, in the workpiece positioning apparatus according to the first aspect, an upper surface opening formed in the upper surface of the mounting table and a hole formed in the mounting table, with one end communicating with the upper surface opening and the other end. Comprises a floating means having a floating supply passage connected to a high pressure fluid supply source, and passes the floating supply passage through the upper surface opening to the workpiece by the high pressure fluid ejected onto the upper surface of the placement table. It is characterized by being supported so as to be movable in the horizontal direction on the upper surface.

  According to a third aspect of the present invention, in the work positioning apparatus according to the first or second aspect, the centering supply passage extends in the vertical direction along the center of the work positioning pin, and the lower end is a high pressure fluid supply source. A main passage portion connected to the main passage portion, and a branch passage portion extending radially and radially outward at the upper end of the main passage portion, each tip communicating with each outer peripheral surface opening. Features.

  According to a fourth aspect of the present invention, in the workpiece positioning device according to any one of the first to third aspects, the workpiece is protruded upward from the upper surface of the mounting table, and is formed in advance on the lower surface of the workpiece by approaching the workpiece from above. It has the work position control pin which can be inserted in the work position control hole currently made.

  According to the workpiece positioning apparatus of the first aspect, in a state where the workpiece positioning pin is inserted into the workpiece positioning hole, the high-pressure fluid can be ejected from the outer peripheral surface opening toward the radially outer side of the workpiece positioning pin. it can.

  Therefore, when the center of the workpiece positioning hole is shifted with respect to the workpiece positioning pin, the pressure between the outer peripheral surface of the workpiece positioning pin and the inner peripheral surface of the workpiece positioning hole is reduced, and the clearance is reduced. Since the smaller pressure increases, the workpiece can be moved in a direction in which the center of the workpiece positioning hole coincides with the center of the workpiece positioning pin due to the pressure difference.

  When the center of the workpiece positioning hole moves to the center of the workpiece positioning pin, the gap formed between the outer peripheral surface of the workpiece positioning pin and the inner peripheral surface of the workpiece positioning hole is made uniform over the entire circumference, The difference is eliminated and the workpiece stops at a position where the center of the workpiece positioning hole and the center of the workpiece positioning pin coincide.

  Therefore, centering can be performed so that the center of the workpiece positioning hole coincides with the center of the workpiece positioning pin. Thereby, in the positioning of the workpiece, it is possible to eliminate variations in the clearance between the workpiece positioning pin and the workpiece positioning hole, and it is possible to perform positioning with high accuracy.

  According to the second aspect of the present invention, the high pressure fluid is supplied from the supply source to the upper surface opening through the floating supply passage while the work is placed on the upper surface of the mounting table, and an opening is formed on the upper surface of the mounting table. The high-pressure fluid can be ejected from the upper surface opening portion formed on the upper surface of the mounting table.

  Therefore, the work placed on the upper surface of the mounting table can be slightly lifted from the upper surface of the mounting table, and can be supported in a floating manner so as to be movable in the horizontal direction. Accordingly, the workpiece can be easily moved, and centering for aligning the center of the workpiece positioning hole with the center of the workpiece positioning pin can be facilitated.

  The invention according to claim 3 shows a specific example of the supply passage for centering. According to this, the supply passage for centering has a main passage portion and a branch passage portion, The passage portion extends in the vertical direction along the center of the workpiece positioning pin, the lower end is connected to a high-pressure fluid supply source, and the branch passage portion radiates radially outward from the upper end of the main passage portion. Thus, each tip communicates with each outer peripheral surface opening. Therefore, the high-pressure fluid can be branched from the main passage portion to the branch passage portion and supplied to each outer peripheral surface opening, and the high-pressure fluid can be ejected radially from the outer peripheral surface of the workpiece positioning pin.

  According to the fourth aspect of the present invention, the workpiece positioning pin and the workpiece position regulating pin are respectively inserted into the workpiece positioning hole and the workpiece position regulating hole which are formed in advance on the lower surface of the workpiece by approaching the workpiece from above. Can do. Thereby, the movement of a workpiece | work can be controlled and a workpiece | work can be stably supported on a mounting base.

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

  1 is a plan view of the workpiece positioning device, FIG. 2 is a cross-sectional view taken along line II in FIG. 1, FIG. 3 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. A sectional view and FIG. 5 are diagrams for explaining a centering method.

  The workpiece positioning apparatus 1 in the present embodiment performs positioning of a workpiece 51 indicated by a two-dot chain line in FIGS. The work 51 has a rectangular block shape, and a work positioning hole 53 and a work position restricting hole 54 are provided on the lower surface 52 of the work 51 as shown in FIGS. The workpiece positioning hole 53 and the workpiece position regulating hole 54 are respectively formed in the vicinity of a pair of corners that are diagonally separated on the lower surface 52 of the workpiece 51, and extend vertically upward with a constant inner diameter. Each is perforated.

  The workpiece positioning device 1 includes a mounting table 11 to 14 for mounting the workpiece 51, a floating means 21 for floatingly supporting the workpiece 51 on the mounting table 11 to 14, and a workpiece positioning pin to be inserted into the workpiece positioning hole 53. 31, a position restricting pin 36 to be inserted into the work position restricting hole 54, and a centering means 41 for moving the work 51 to a position where the center of the work positioning hole 53 coincides with the center of the work positioning pin 31. Yes.

  The mounting tables 11 to 14 are fixed to the upper part of the base 2 installed on the floor surface F, and are provided at positions corresponding to the four corners of the lower surface 52 of the work 51. Specifically, the mounting tables 11 and 13 are positioned on one diagonal line of the lower surface 52, and the mounting tables 12 and 14 are on the other diagonal line of the lower surface 52 and the workpiece positioning hole 53 and the workpiece position regulating hole 54 of the workpiece 51. Is provided at a position corresponding to.

  Each mounting table 11 to 14 is configured by a block material having a predetermined thickness, and each upper surface 11 a to 14 a has a planar shape that extends horizontally and can contact the lower surface 52 of the workpiece 51. ing.

  Chambers 23-1 to 23-4 are formed in the mounting tables 11 to 14, and supply pipes L1 to L4 for supplying high-pressure coolant water, which is a high-pressure fluid, are connected. The chambers 23-1 to 23-4 have openings 25 formed on the side surfaces 11 b to 14 b of the mounting tables 11 to 14 so as to have a constant diameter and extend in the mounting tables 11 to 14 substantially horizontally. Has been drilled.

  A connection coupler 26 is attached to the inlet portions 25 of the chambers 23-1 to 23-4, and the tips of the supply pipes L1 to L4 are connected. The base ends of the supply pipes L1 to L4 are connected to a supply pump P for pumping high-pressure coolant water from a tank (not shown). Further, an electromagnetic valve 28 for controlling the supply of the high-pressure coolant water to the supply pipes L1 to L4 is provided in the middle position between the supply pump P and the supply pump P.

  The floating means 21 includes upper surface openings 22-1 to 22-4 and a floating supply passage 27. The upper surface openings 22-1 to 22-4 are formed on the upper surfaces 11a to 14a of the mounting tables 11 to 14, respectively. Of the upper surface openings 22-1 to 22-4, the upper surface openings 22-1 and 22-3 are recessed at a central area of the upper surfaces 11 a and 13 a of the mounting tables 11 and 13 over a predetermined area. The upper surfaces 11a and 13a are provided on the outer periphery so as to be continuous over the circumference. The upper surface openings 22-2 and 22-4 are recessed over a predetermined area at positions spaced apart from each other at two positions on the upper surfaces 12a and 14a of the mounting tables 12 and 14, and the upper surfaces are formed on the outer periphery. 12a and 14a are provided so that it may continue over the circumference.

  The floating supply passage 27 has one end communicating with the center of the bottom of each of the upper surface openings 22-1 to 22-4 and the other end communicating with each of the chambers 23-1 to 23-4. The high-pressure coolant water pumped into the chambers 23-1 to 23-4 via the valve 28 and the supply pipes L1 to L4 can be supplied to the upper surface openings 22-1 to 22-4. Yes.

  Therefore, high-pressure coolant water can be ejected from the upper surface openings 22-1 to 22-4 onto the upper surfaces 11a to 14a of the mounting tables 11 to 14, and the workpiece 51 is slightly from the upper surfaces 11a to 14a of the mounting tables 11 to 14. It can be floated and supported so as to be movable in the horizontal direction.

  The work positioning pin 31 is provided at a substantially central position of the upper surface 12a of the mounting table 12, has a substantially cylindrical shape extending in the vertical direction with a constant diameter, and its upper end moves upward. It is formed in a tapered cone shape that gradually decreases in diameter.

  The outer diameter of the workpiece positioning pin 31 is a diameter that forms a predetermined clearance with the inner peripheral surface of the workpiece positioning hole 53 in the inserted state in order to facilitate the work at the time of setting and removing the workpiece 51. Is set. For example, in this embodiment, the hole diameter of the workpiece positioning hole 53 of the workpiece 51 is set to 12 mm tolerance +0.027 to −0, and the workpiece positioning pin 31 has an outer diameter of 12 mm tolerance −0 as an optimum dimension. The clearance is set to be (+0.027) − (− 0.017) = 0.034 mm (34 μm). That is, the diameter dimension is set so that there is a gap between the inner peripheral surface of the workpiece positioning hole 53 and the outer peripheral surface of the workpiece positioning pin 31 when the workpiece positioning pin 31 is inserted into the workpiece positioning hole 53. .

  The centering means 41 includes a plurality of outer peripheral surface openings 42 formed in the outer peripheral surface of the work positioning pin 31 at equal intervals in the circumferential direction, and one end of each outer peripheral surface opening formed in the work positioning pin 31. The centering supply passage 45 communicates with 42 and communicates with the chamber 23-2 at the other end.

  In the present embodiment, the outer peripheral surface opening 42 is formed in a disc shape so as to be along the outer peripheral surface of the work positioning pin 31, and at a height position facing the inner peripheral surface of the work positioning hole 53. Three locations are provided so as to be positioned at an interval of 120 ° in the circumferential direction.

  The centering supply passage 45 has a main passage portion 44 extending in the vertical direction along the center of the workpiece positioning pin 31 and having a lower end communicating with the chamber 23-2 of the mounting table 12, and a diameter at the upper end of the main passage portion 44. It has three branch passage portions 43 that are bent outwardly in the direction of the branch and extend radially and extend, and the tips communicate with the centers of the recesses of the respective outer peripheral surface openings 42.

  The centering means 41 having the above configuration supplies the high-pressure coolant water fed into the chamber 23-2 through the centering supply passage 45 to each outer peripheral surface opening 42, and the diameter is increased from the outer peripheral surface of the workpiece positioning pin 31. It can be ejected radially in three directions toward the outside in the direction.

  In the present embodiment, the work positioning pin 31 is formed integrally with the mounting table 12, and the main passage 44 has an inner diameter of 1.2 mm, the branch passage 43 has an inner diameter of 0.8 mm, and an outer peripheral surface opening. The inner diameter of the part 42 is set to 5 mm.

  The work position regulating pin 36 is provided at a substantially central position of the upper surface 14a of the mounting table 14, and is constituted by a so-called diamond pin whose cross section has a substantially rhombus shape and extends in the vertical direction. It has an acute angle side apex portion 37 and a pair of obtuse angle side apex portions 38 facing each other.

  The acute angle side apex 37 of the workpiece position regulating pin 36 is chamfered so as to be opposed to the inner peripheral surface of the workpiece position regulating hole 54 with a predetermined clearance, and connects the pair of acute angle side apex 37. The movement of the workpiece 51 in the linear direction is restricted.

  The workpiece position regulating pin 36 is fixed to the upper surface 14a of the mounting table 14 so that the workpiece positioning pin 31 is positioned on a linear extension line connecting the pair of obtuse angle side top portions 38. The workpiece 51 is configured to be allowed to move in a linear direction connecting the pins 36 and within a predetermined range.

  In the figure, reference numeral 16 denotes a clamper for fixing the work 51. In the present embodiment, the clamper 16 includes a clamp cylinder 17 and a clamp arm 18, and is provided at positions corresponding to the mounting tables 11 to 14. The clamp cylinder 17 is fixed on the base 2 so that the cylinder body 17a extends in the vertical direction, and the cylinder rod 17b protrudes upward from the upper end thereof. The clamp arm 18 includes the cylinder rod 17b. It is attached so that it may extend in the horizontal direction at the tip.

  The clamper 16 supplies a driving source such as compressed air to the clamp cylinder 17, thereby rotating the clamp arm 18 around the cylinder rod 17 b so that the tip of the clamp arm 18 is placed on the mounting table 11 at a position above the workpiece 51. It arrange | positions in the position facing 14 upper surfaces 11a-14a, and is comprised so that it may move further below and the workpiece | work 51 may be clamped between the mounting bases 11-14.

  Next, the positioning operation of the workpiece 51 by the workpiece positioning device 1 having the above configuration will be described below.

  First, the workpiece 51 is set on the workpiece positioning device 1. Here, the workpiece 51 is lowered from above the workpiece positioning device 1, the workpiece positioning pin 31 is inserted into the workpiece positioning hole 53, and the workpiece position regulating pin 36 is inserted into the workpiece position regulating hole 54. Place on the mounting tables 11-14. Thereby, the workpiece | work 51 is set to the workpiece | work positioning apparatus 1, and the lower surface 52 of the workpiece | work 51 is in contact with the upper surfaces 11a-14a of the mounting bases 11-14.

  Next, the solenoid valve 28 is opened, and high-pressure coolant water is supplied from the supply pump P to the chambers 23-1 to 23-4 via the supply pipes L1 to L4. The high-pressure coolant water supplied to each of the chambers 23-1 to 23-4 passes through the floating supply passage 27 and is jetted to the upper surface openings 22-1 to 22-4 of the mounting tables 11-14. Accordingly, the workpiece 51 is slightly lifted from the upper surfaces 11a to 14a of the mounting tables 11 to 14, and is supported in a floating manner so as to be movable in the horizontal direction.

  Further, the high-pressure coolant water supplied to the chamber 23-2 passes through the three branch passage portions 43 from the main passage portion 44 of the centering supply passage 45, and the diameter of the workpiece positioning pin 31 from each outer peripheral surface opening portion 42. It ejects radially outward.

  Here, for example, as shown in FIG. 5A, if the center of the workpiece positioning hole 53 is shifted with respect to the center of the workpiece positioning pin 31, the pressure with the larger gap decreases and the gap becomes smaller. The pressure increases. The workpiece 51 is floatingly supported by the floating means 21 and can be easily moved in the horizontal direction.

  Therefore, the workpiece 51 moves in a direction in which the center of the workpiece positioning hole 53 coincides with the center of the workpiece positioning pin 31. When the center of the workpiece positioning hole 53 approaches the center of the workpiece positioning pin 31, the gap between the outer peripheral surface of the workpiece positioning pin 31 and the inner peripheral surface of the workpiece positioning hole 53 is uniform as shown in FIG. The pressure difference is eliminated, and the workpiece 51 stops at a position where the center of the workpiece positioning hole 53 coincides with the center of the workpiece positioning pin 31.

  When the workpiece 51 is positioned at a position where the center of the workpiece positioning hole 53 coincides with the center of the workpiece positioning pin 31, the workpiece 51 is gripped by the clamper 16 and processing of the workpiece 51 is started.

  According to the workpiece positioning apparatus 1 having the above-described configuration, the high-pressure coolant water is ejected radially in three directions from the outer peripheral surface of the workpiece positioning pin 31 inserted into the workpiece positioning hole 53, so that the center of the workpiece positioning hole 53 is at the center of the workpiece positioning hole 53. The workpiece 51 can be moved in a direction coinciding with the center of the positioning pin 31, and centering can be performed so that the center of the workpiece positioning hole 53 coincides with the center of the workpiece positioning pin 31. Therefore, it is possible to eliminate variations in the clearance between the work positioning pins 31 and the work positioning holes 53. Therefore, the workpiece 51 can be positioned with high accuracy, and the machining accuracy of the workpiece 51 can be improved.

  In addition, each workpiece 51 can be positioned at a position where the center of the workpiece positioning hole 53 coincides with the center of the workpiece positioning pin 31 without being affected by variations in the hole diameter size of the workpiece positioning hole 53 due to manufacturing tolerances.

  Moreover, the workpiece | work 51 can be floating-supported on the upper surfaces 11a-14a of the mounting bases 11-14 by ejecting high pressure coolant water from the upper surface openings 22-1 to 22-4. Therefore, the workpiece 51 can be easily moved, and the positioning of the workpiece 51 by the centering means 41 can be performed quickly and easily.

  Moreover, the cutting which exists between the upper surfaces 11a-14a of the mounting bases 11-14 and the lower surface 52 of the workpiece | work 51 with the high pressure coolant water ejected from the upper surface opening parts 22-1-22-22 of the mounting bases 11-14. Foreign substances such as powder can be washed away. Therefore, it is possible to prevent the position deviation of the workpiece 51 due to the foreign object being caught, and it is possible to prevent the processing accuracy of the workpiece 51 from being deteriorated due to the position deviation.

  And according to said workpiece | work positioning device 1, the workpiece | work 51 can be positioned easily, without providing a movable part. Therefore, the apparatus can be configured with a small number of parts, and the entire apparatus can be made a simple structure. Therefore, the price of the device itself can be made inexpensive. Further, since the structure is simple, maintenance can be facilitated, and costs such as maintenance costs can be reduced.

  Further, the workpiece 51 is provided with the workpiece positioning pin 31 and the workpiece position regulating pin 36 at positions corresponding to the workpiece positioning hole 53 and the workpiece position regulating hole 54 which are separated diagonally on the lower surface 52 of the workpiece 51. Can be stably supported on the upper surfaces 11 a to 14 a of the mounting tables 11 to 14.

  Further, the work positioning pins 31 are provided with centering means 41, and the work position restricting pins 36 are constituted by so-called diamond pins, so that the moving direction of the work 51 is mainly along a straight line connecting the work positioning pins 31 and the work position restricting pins 36. The direction can be regulated. Accordingly, the positioning of the work 51 by the centering means 41 can be performed more quickly and easily.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the case where the high-pressure coolant water is ejected radially from the outer peripheral surface of the workpiece positioning pin 31 in the circumferential direction at an equal interval in three directions has been described as an example. The direction is not limited to three directions, and any number may be used as long as the workpiece positioning hole 53 can be moved toward the center of the workpiece positioning pin 31 by pressure balance.

  In the above-described embodiment, the case where high-pressure coolant water is used as an example of the high-pressure fluid has been described. However, the high-pressure fluid may be other types, and is not limited to a liquid. A gas such as compressed air may be used.

It is a top view of a workpiece positioning device. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a figure explaining the method of centering by a centering means. It is a figure explaining 1st prior art. It is a figure explaining the variation in positioning resulting from clearance. It is a figure explaining the dispersion | variation in the positioning resulting from manufacturing tolerance. It is a figure explaining the 2nd prior art. It is a perspective view of a work positioning pin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work positioning apparatus 11-14 Mounting stand 21 Floating means 22-1 to 22-4 Upper surface opening part 23-1 to 23-4 Chamber 27 Floating supply path 31 Work positioning pin 36 Work position control pin 41 Centering means 42 Outer peripheral surface Opening 45 Centering supply passage 51 Work 53 Work positioning hole 54 Work position restricting hole P Supply pump (supply source)
L1-L4 supply pipe

Claims (4)

A mounting table having an upper surface on which a workpiece is placed;
A workpiece positioning pin that protrudes upward from the upper surface of the mounting table and can be inserted into a workpiece positioning hole formed in advance on the lower surface of the workpiece by making the workpiece approach from above;
A plurality of outer peripheral surface openings formed at equal intervals in the circumferential direction on the outer peripheral surface of the work positioning pin, and one end communicated with each outer peripheral surface opening formed in the work positioning pin. Centering means having a supply passage for centering connected to a supply source of high-pressure fluid,
When the workpiece positioning pin is inserted into the workpiece positioning hole, there is a gap between the inner circumferential surface of the workpiece positioning hole and the outer circumferential surface of the workpiece positioning pin, and the workpiece positioning pin is inserted into the workpiece positioning hole. The work positioning hole is centered on the upper surface of the mounting table by ejecting the high-pressure fluid from the openings on the outer peripheral surfaces toward the outside in the radial direction of the work positioning pin in a state of being attached. A workpiece positioning device, wherein the workpiece positioning device is moved to a position coinciding with the center of a positioning pin. A floating having an upper surface opening formed in the upper surface of the mounting table and a floating supply passage drilled in the mounting table and having one end communicating with the upper surface opening and the other end connected to a high pressure fluid supply source With means,
The workpiece is supported so as to be movable in the horizontal direction on the upper surface of the mounting table by high-pressure fluid that passes through the floating supply passage and is ejected from the upper surface opening onto the upper surface of the mounting table. The work positioning apparatus according to claim 1. The centering supply passage is:
A main passage portion extending in the vertical direction along the center of the workpiece positioning pin, and having a lower end connected to a high-pressure fluid supply source;
A branch passage portion extending radially and radially outward at the upper end of the main passage portion, each tip communicating with each of the outer peripheral surface openings,
The workpiece positioning device according to claim 1, wherein the workpiece positioning device is provided.   It has a workpiece position regulating pin that protrudes upward from the upper surface of the mounting table and can be inserted into a workpiece position regulating hole formed in advance on the lower surface of the workpiece by approaching the workpiece from above. The workpiece positioning apparatus according to any one of claims 1 to 3.

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