JP2020069539A - Centering device - Google Patents

Abstract

To efficiently center a plurality of annular workpieces.SOLUTION: A centering device for overlapping a plurality of annular workpieces W and coaxially positioning the workpieces includes: center axis 20; a plurality of adjust rings 50a and 50b supported by the center axis corresponding to the plurality of workpieces; and a plurality of plunger sets composed of a plurality of plungers 70 so that each of the plurality of plungers correspond to workpieces and a base end is radially supported so as to be engaged with the adjust rings in the outer part of the center axis; a first spring 56 and a second spring 58 that elastically support the adjust rings from the lower part, in which the adjust rings and the plungers are engaged on inclined surfaces 78 and 80, each of the plungers advance by lowering the upper adjust ring, and the tip is brought into contact with the inner peripheral surface of the workpiece W. Even when inner diameters of the plurality of workpieces vary, the plurality of workpieces can be efficiently centered.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a centering device for a plurality of annular works.

  In machining such as lathe machining and milling, an annular work (also referred to as a ring shape, a donut shape, etc.) is sometimes processed, and such a work is positioned during the processing. For example, there is a technique described in the following patent document for proper positioning of an annular work, that is, centering.

Japanese Utility Model Publication No. 4-125507 JP-A-6-328307 Japanese Patent No. 5478187

  Although the above-mentioned patent documents disclose a technique for performing centering based on the inner diameter of an annular work, only any technique relating to centering for one work is described. Considering productivity, it is also desirable to machine multiple annular workpieces at once, and in that case, the machining of those workpieces by efficiently performing the set of those workpieces, that is, centering. Convenience will be improved. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a centering device capable of efficiently centering a plurality of annular works.

In order to solve the above problems, the centering device of the present invention,
A centering device for positioning a plurality of annular works coaxially with each other,
The central axis,
A plurality of movable bodies arranged in the axial direction, which is the direction in which the axis of the central shaft extends, and each of which is supported by the central shaft so as to be movable in the axial direction;
A support arranged so as to surround the central axis,
A plurality of members arranged in the axial direction, arranged on a circle centered on the axis in a posture extending in the radial direction perpendicular to the axial direction and supported by the support body so as to be movable in the radial direction. With multiple plunger sets consisting of
The plurality of works are arranged in the axial direction so as to correspond to the plurality of plunger sets and the plurality of movable bodies, respectively, and each of the plurality of works constitutes the corresponding plunger set. It is arranged so that it can be displaced in the radial direction so as to surround the plunger of
Each of the plurality of plungers constituting each of the plurality of plunger sets engages with the corresponding movable body at the base end portion, and moves outward in the radial direction, so that the plurality of plunger sets correspond to each other at the tip end portion. It is possible to contact the inner peripheral surface of the work
The engagement between the movable body and the proximal end portion of the plunger is such that the plunger is moved outward in the radial direction by the movement in one direction in the axial direction of the movable body,
By moving each of the plurality of movable bodies in the one direction until the tip of each of the plurality of plungers engaging with each of the plurality of movable bodies comes into contact with the inner peripheral surface of the corresponding work, It is characterized in that it is configured to perform centering on each of the axes of the work.

  According to the centering device of the present invention, even if there are variations in the inner diameters of a plurality of annular works, the plurality of works can be positioned coaxially with each other. That is, it is possible to efficiently perform centering of a plurality of annular works.

It is a top view of the centering device of an example. It is sectional drawing in AA in FIG. 1 of the centering device of an Example. It is sectional drawing of the centering device of a modification.

  Hereinafter, as a mode for carrying out the present invention, a centering device that is an embodiment of the present invention and a modification thereof will be described in detail with reference to the drawings. The present invention can be implemented in various modes in which various modifications and improvements are made based on the knowledge of those skilled in the art, in addition to the following examples and modified examples.

  As shown in FIGS. 1 and 2, the centering device of the embodiment includes a generally disk-shaped base 10 that functions as a base, and the base 10 is fixed to a table 12 by bolts 14. .. A support cylinder 16 having a generally bottomed cylindrical shape is fixed to the center of the base 10 by a bolt 18. Further, a hollow central shaft 20 having a flange at its lower portion is fixed to the support cylinder 16 by a bolt 22 in the internal space. Briefly, the support cylinder 16 and the central shaft 20 are erected on the base 10. The axes of the base 10, the support cylinder 16, and the central axis 20 are aligned with the axis L of the centering device. That is, the base 10, the support cylinder 16, and the central shaft 20 are arranged coaxially with each other. Although not clearly shown, the bolts 14 and 22 are provided on the circumference of the circle centered on the axis L at six equal intervals.

  The work W (indicated by a chain double-dashed line in the drawing) centered by the main centering device has an annular shape (also referred to as “doughnut shape” or “ring shape”). By the centering device, the two works W are centered at once in a state of being aligned in a direction in which the axis L extends (hereinafter, may be referred to as “axis direction”), that is, in a state of being vertically stacked. .. The two works W are fixedly held by a holding jig 24 that functions as a work holder. The holding jig 24 includes a generally disk-shaped jig base 26 on which the works W are placed in an overlapping state, and an annular holding ring 28 for holding the two works W between the jig base 26. , And includes four fastening bolts 30 and four washers 32 for fastening the jig base 26 and the holding ring 28 in a state where the work W is held.

  The upper surface of the base 10 projects in an annular shape centered on the axis L, and the support cylinder 16 is fitted to the inner peripheral surface of the projecting portion, while the jig base 26 is fitted to the outer peripheral surface 34 of that portion. Are fitted together. Specifically, a recess is formed in the center of the lower surface of the jig base 26, and the inner peripheral surface 36 of the recess and the outer peripheral surface 34 of the projecting portion of the upper surface of the base 10 are in close contact with each other. Then, the jig base 26 is coaxially set on the base 10. Both the outer peripheral surface 34 and the inner peripheral surface 36 are slightly inclined surfaces (the peripheral surfaces of the truncated cone), and the outer peripheral surface 34 and the inner peripheral surface 36 are brought into close contact with each other, so that the jig base 26 is fixed to the base 10. On the other hand, the axes will be set so that their axes coincide with each other. To facilitate the setting, guide pins 38 are provided upright at two locations on the base 10, and the jig base 26 has two guide holes 40 into which the guide pins 38 are inserted. , Are formed at positions corresponding to the guide pins 38. The set jig base 26 is fixed to the base 10 by the three clamps 42 arranged at an equal angular pitch on the outer peripheral end of the base 10.

  On the jig base 26, four fastening bolts 30 are screwed upright. On the other hand, in each of the two works W, ten through holes 44 penetrating in the axial direction are bored on the circumference of one circle at an equal angular pitch, and four fastening bolts 30 are provided. The two works W are held by the jig base 26 in a state of being inserted into four of the through holes 44, respectively. By the way, the through holes 44 have the same inner diameter, and the inner diameter is larger than the outer diameter of the head portion of the fastening bolt 30.

  The holding ring 28 is also provided with ten through holes corresponding to the through holes 44 of the work W, and four of them are generally gourd-shaped having a large diameter portion and a small diameter portion. Hole (hereinafter, may be referred to as “gourd hole”) 46. The four fastening bolts 30 fix the work W in a state of being respectively inserted into the four gourd holes 46. The inner diameter (inner dimension) of the small diameter portion of the gourd hole 44 is larger than the outer diameter of the body portion of the fastening bolt 30, but smaller than the outer diameter of the head portion, and the inner diameter (inner dimension) of the large diameter portion is It is made larger than the outer diameter of the head of the fastening bolt 30. The washer 32 has a notch for radially inserting the body portion of the fastening bolt 30.

  With the above structure, the holding jig 24 can set and reset the work W without removing the fastening bolt 30 from the jig base 26. Specifically, with the four fastening bolts 30 slightly loosened, the two workpieces W are sequentially placed on the jig base 26 with the fastening bolts 30 inserted into the through holes 44, and then, The clamping ring 28 is superposed on the work by inserting the four fastening bolts 30 into the large diameter portions of the four gourd holes 46, and the clamping ring 28 is attached to the small diameter portions of the four gourd holes 46 by 4 respectively. The four fastening bolts 30 are rotated so as to be housed, and washers 32 are inserted from the radial direction using the notches between the heads of the four fastening bolts 30 and the holding ring 28, and the four fastening bolts 30 are inserted. By tightening, the work W can be fixedly held on the holding jig 24, that is, the work W can be set on the holding jig 24. The work W can be detached from the holding jig 24, that is, reset, by a procedure reverse to that of such a set.

  In the centering device, two adjust strings 50a and 50b corresponding to the number of works W are supported as a plurality of movable bodies arranged in the axial direction so as to be fitted onto the central shaft 20. If one direction in the axial direction is defined as the lower side and the other direction is defined as the upper side, and the side in the one direction is defined as the lower side and the side in the other direction is defined as the upper side, the adjust ring 50a located on the lower side has two adjust The ring 50a, 50b is located on the most unidirectional side, and the adjust ring 50b located on the upper side is adjacent to the adjust string 50a on the other direction side of the adjust string 50a.

  The two adjust rings 50a and 50b are movable in the axial direction, that is, in the up-down direction, with the inner peripheral surface slidingly contacting the outer peripheral surface of the central shaft 20. By the way, a key groove 52 extending in the axial direction is provided at one position in the circumferential direction on the inner peripheral surface of each of the adjust rings 50a and 50b, and each key groove is provided on the outer peripheral surface of the central shaft 20. By engaging with 54, rotation of the adjust rings 50a, 50b about the axis L with respect to the central axis 20 is prohibited.

  Twelve first springs 56 (compression coil springs) are arranged at equal pitches along one circumference between the adjust ring 50a and the lower flange of the central shaft 20. .. The first springs 56 function as a first elastic body that elastically biases the adjust ring 50a upward. In other words, the adjust ring 50a is elastically supported from below by the first spring 56. Further, twelve second springs 58 (compression coil springs) arranged at equal pitches along one circumference are arranged between the adjust rings 50a and 50b. The second springs 58 function as a second elastic body that elastically biases the adjust ring 50a and the adjust string 50b in a direction in which they are separated from each other in the vertical direction. In other words, the adjust ring 50b is elastically supported from below by the second spring 58. By the way, conceptually, the second spring 58 is provided between each of the adjust rings 50a and 50b except the one located on the most other direction side and the one located on the other other side thereof. It can be considered as an elastic body disposed in the.

  A collar 60 is fitted over the central shaft 20 in a state where the lower end is in contact with the adjust ring 50b, above the adjust string 50b which is located on the most other direction side of the adjust strings 50a and 50b. ing. A male screw is formed on the upper end of the central shaft 20, and a nut 62 having a female screw is screwed onto the upper end. By rotating the nut 62 in the tightening direction, the nut 62 is moved via the collar 60 and against the biasing force of the first spring 56 and the second spring 58. That is, the nut 62 and the collar 60 move the adjust strings 50a and 50b in one direction at a time so that the adjust string 50b located on the othermost side of the adjust strings 50a and 50b is moved to the first spring 56 and the second spring. It functions as a means for pushing against the biasing force of the spring 58.

  Further, in the main alignment device, a plurality of plungers 70 are supported on the peripheral wall of the support cylinder 16 that functions as a support. More specifically, a plurality of support holes 72 penetrating the support cylinder 16 are provided in the peripheral wall of the support cylinder 16, and the twelve plungers 70 are respectively arranged at right angles to the axis L by the twelve support holes 72. It is movably supported in the direction, that is, in the radial direction. More specifically, the twelve plungers 70 are divided into two sets of six (hereinafter sometimes referred to as “plunger set”). The two plunger sets correspond to the two workpieces W and the two adjust strings 50a and 50b. In each of the plunger sets, the six plungers 70 are arranged at six equidistant positions in the circumferential direction in the radial direction. It is arranged in a posture that extends to. That is, the six plungers 70 are arranged so as to extend radially around the axis L. Further, the two plunger sets are arranged in the axial direction, that is, in the vertical direction, but the pitch in that direction, that is, the distance between the centers of the plungers 70 in the vertical direction is equal to the thickness of the work W. .. The axial position of the center line of each plunger 70 of the plunger set located above is equal to the center position in the thickness direction of the workpiece W located above, and the center of each plunger 70 of the plunger set located below The position of the line in the axial direction is set to be equal to the center position in the thickness direction of the work W located below, and each of the two works W is arranged so as to surround the six plungers 70 of the corresponding plunger set. It Even when the two works W are stacked and placed on the jig base 26, each of the two works W is in a radial direction to some extent in a state where the fastening bolt 30 is not tightened. It is supposed to be displaceable.

  The lengths of the six plungers 70 forming each plunger set are made equal. A locking ring 74 is fitted to each plunger 70 at a position located inside the peripheral wall of the support cylinder 16. In each plunger 70, the locking ring 74 and the inner surface of the peripheral wall of the support cylinder 16 are arranged. A retreat spring 76 (which is a compression coil spring) is arranged in between, with each plunger 70 being inserted therethrough. The retracting spring 76 functions as a means for urging the plunger 70 in the direction toward the axis L, that is, in the retracting direction.

  In each of the plungers 70, if the end on the side closer to the axis L is called the base end and the end on the side far from the axis L is called the tip, the tip of each plunger 70 is rounded, and the end of the support cylinder 16 is rounded. It is located outside the peripheral wall and can come into contact with the inner peripheral surface of the corresponding work W. On the other hand, the outer peripheral surface 78 of each of the adjuster rings 50 a and 50 b is an inclined surface that approaches the axis L as it goes in one direction in the axial direction, that is, as it goes downward, and the base end of each plunger 70. The part has an inclined surface 80 at the same angle as the inclined surface. Therefore, the biasing force of the retreat spring 76 causes the inclined surface 80 of the proximal end portion of each plunger 70 and the outer peripheral surface 78 of the corresponding adjuster string 50a, 50b to be in a state of substantially exactly contacting each other.

  Even if two workpieces W are stacked and placed on the jig base 26, the adjust rings 50a and 50b are provided with the first spring 56 and the second spring 58 when the nut 62 is not tightened. Due to the force, it is located to some extent at the position on the other side in the axial direction, that is, at the upper position. In this state, each of the plungers 70 is located at a retracted position to some extent, and at least one of the tip ends of the six plungers 70 forming each plunger set is separated from the inner peripheral surface of the corresponding work W. By tightening the nut 62 in this state, the adjust rings 50a and 50b move in one axial direction, that is, downward, against the biasing forces of the first spring 56 and the second spring 58. By this movement, each plunger 70 moves outward in the radial direction against the urging force of the retracting spring 76 by the interaction between the inclined surface 78 of the base end portion and the outer peripheral surface 78 of the adjuster strings 50a and 50b. To do. That is, each plunger 70 advances. The six plungers 70 constituting each plunger set move forward until all the tip end portions contact the inner peripheral surface of the work W. By this forward movement, each of the two works W is in a state in which its own axis matches the axis L. In other words, the centering device does not move the adjuster strings 50a and 50b until the tips of the six plungers 70 engaging with the adjuster strings 50a and 50b contact the inner peripheral surface of the corresponding one of the two works W. By moving in one direction in the axial direction, the two workpieces W are configured to be centered with respect to the respective axial lines L at one time.

  It is expected that the diameter of the inner peripheral surface of each work W may vary to some extent. Even if there is such a variation, according to the main alignment device, since the adjust strings 50a and 50b are elastically supported with respect to each other, the adjust strings 50a and 50b are moved to the positions corresponding to the inner diameter of the corresponding work W, respectively, and a plurality of them are obtained. It is possible to coaxially arrange the workpieces W.

  After the centering of the two works W is completed, the holding ring 28 and the washer 32 are set, the fastening bolts 30 are tightened, and the two works W are fixed to the jig base 26. After the two works W are set on the holding jig 24 in such a manner, the clamp 42 is released, and the holding jig 24 is lifted and separated from the base 10. The detached holding jig 24 is conveyed to a machine processing machine (which is a machine tool such as a lathe and a milling machine) for machining the work W, and is set in the machine processing machine. Specifically, the bed of the machine tool is provided with a base similar to the base 10 of the main centering device, and the holding jig 24 is set on the base so that the two works W are coaxial. Is set in the machining machine in a state of being positioned at, that is, a state in which the two works W are both centered.

Modification

  In the centering device of the present invention, the number of works that can be centered may be plural, and the diameter of the works is not particularly limited. In the centering device of the above-described embodiment, the two annular workpieces W are centered. However, in the centering device of the modified example shown in FIG. 3, the three annular workpieces W ′ are centered. The work W'is larger in both outer diameter and inner diameter than the work W.

  Since the work W'has a large diameter, the holding jig 24 'has a large diameter. Specifically, the jig base 26 'and the sandwiching ring 28' have large diameters. Further, the support cylinder 16 'and the adjust rings 50a', 50b ', 50c' also have large diameters in accordance with the increase in the work W '.

  Further, since the three workpieces W'are centered at one time, the lengths of the fastening bolt 30 'and the central shaft 20' in the holding jig 24 'are long. The number of adjusters 50a ', 50b', 50c 'and the number of plunger sets has also been increased to three, and the support cylinder 16' can be simply said as three sets of plungers 70 are arranged in the axial direction. It is designed to support three stages. The first spring 56, which is the first elastic body, is arranged below the adjust ring 50a ′, as in the centering device of the above-described embodiment, but the second spring 58, which is the second elastic body, is Unlike the centering device of the example, it is arranged not only between the adjust ring 50a 'and the adjust ring 50b' but also between the adjust string 50b 'and the adjust string 50c'.

  The function, usage, and the like of the modification centering device are the same as those of the embodiment centering device, so description thereof will be omitted here.

  10: Base [Base] 16: Support Cylinder [Support] 20, 20 ': Center Shaft 24, 24': Holding Jig [Work Holding] 26: Jig Base 28: Holding Ring 30, 30 ': Fastening Bolt 32: washers 50a, 50b, 50a ', 50b', 50c ': adjust ring [movable body] 56: first spring [first elastic body] 58: second spring [second elastic body] 60: collar [movable body] 62: Nut [Means for pushing the movable body] 70: Plunger 78: Outer peripheral surface [Slope] 80: Slope L: Axes W, W ': Workpiece

Claims (4)

A centering device for positioning a plurality of annular works coaxially with each other,
The central axis,
A plurality of movable bodies arranged in the axial direction, which is the direction in which the axis of the central shaft extends, and each of which is supported by the central shaft so as to be movable in the axial direction;
A support arranged so as to surround the central axis,
A plurality of members arranged in the axial direction, arranged on a circle centered on the axis in a posture extending in the radial direction perpendicular to the axial direction and supported by the support body so as to be movable in the radial direction. With multiple plunger sets consisting of
The plurality of works are arranged in the axial direction so as to correspond to the plurality of plunger sets and the plurality of movable bodies, respectively, and each of the plurality of works constitutes the corresponding plunger set. It is arranged so that it can be displaced in the radial direction so as to surround the plunger of
Each of the plurality of plungers constituting each of the plurality of plunger sets engages with the corresponding movable body at the base end portion, and moves outward in the radial direction, so that the plurality of plunger sets correspond to each other at the tip end portion. It is possible to contact the inner peripheral surface of the work
The engagement between the movable body and the proximal end portion of the plunger is such that the plunger is moved outward in the radial direction by the movement in one direction in the axial direction of the movable body,
By moving each of the plurality of movable bodies in the one direction until the tip of each of the plurality of plungers engaging with each of the plurality of movable bodies comes into contact with the inner peripheral surface of the corresponding work, A centering device configured to perform centering on each of the axes of the workpiece. The engagement between the movable body and the proximal end portion of the plunger is
The centering device according to claim 1, wherein the inclined surfaces formed on each of them and inclined in a direction approaching the axis toward the one direction with respect to the axial direction are in contact with each other. The centering device is
A first elastic body that elastically biases the most movable one of the plurality of movable bodies toward the other direction opposite to the one direction;
Arranged between each of the plurality of movable bodies excluding the one located closest to the other direction side and one of the plurality of movable bodies adjacent to each of the plurality of movable bodies on the other direction side. And at least one second elastic body that elastically biases the two movable bodies in a direction in which they are separated from each other in the axial direction,
In order to move each of the plurality of movable bodies in the one direction at a time, one of the plurality of movable bodies located closest to the other direction is defined as the first elastic body and the at least one second body. The centering device according to claim 1 or 2, further comprising means for pushing in one direction against an urging force of an elastic body. The centering device is
A base body on which the central axis and the support are erected,
A work holder which is set on the base body in a state where the plurality of works can be arranged side by side in the axial direction and can be held, and which can be detached from the base body while fixing the plurality of centered works. The centering device according to any one of claims 1 to 3.

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