JP2003239918A - Positioning fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positioning fixture which is attachable and detachable without using an exclusive tool and accurately positions a member to be joined. <P>SOLUTION: The positioning fixture has a cylindrical outer ring 11 formed with tapers diametrally expanded from an axial center to both openings in an inner circumference, a first inner ring having a bolt screw hole 12 in a center and an outer circumferential face formed like a taper diametrally expanding from one end toward another end, and a second inner ring 13 having bolt insertion hole 13a in a center and a circumferential face formed like a taper the same as that of the first inner ring. The first inner ring and the second inner ring are fitted in from both openings of the cylindrical outer ring so that small diameter sides face each other. A fastening bolt 14 to be screwed in the bolt screw hole is inserted from the bolt insertion hole of the second inner ring and it is screwed in the bolt screw hole of the first inner ring. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning fixture for positioning two workpieces and fixing them so that they do not move relative to each other.

[0002]

2. Description of the Related Art Conventionally, when fixing jigs to a machine tool, a positioning means and a fixing means are used to move a jig side base (material) to a machine tool side fixing base (fixing material). It was done to mount and fix it at a fixed position.

For example, the positioning fixture 30 shown in FIG.
In (conventional example 1), a positioning recess 32a for positioning the workpiece 34 is provided on the fixed material 32 side, and a positioning recess 3 on the fixed material 32 side is provided on the workpiece 34 side.
The positioning of the workpiece 34 with respect to the fixing member 32 is performed by providing the positioning protrusion 34a that fits with the 2a. Then, the positioned bolts are fixed to each other by a fixing bolt 36.
It is fixed using.

Further, in the positioning fixture 40 shown in FIG. 5 (conventional example 2), a positioning pin hole 42 for performing positioning at a corresponding position of the fixing material 42 and the workpiece 44.
a, 44a are drilled, and the positioning pin 48 is placed in the pin hole.
By inserting and fitting the
Is being positioned. Then, the both positioned are fixed using a fixing bolt 46.

Further, the positioning fixture 50 shown in FIG.
In (conventional example 3), a positioning pin 58 for circumscribing the two side surface portions 54a and 54b of the workpiece 54, which is connected to the fixed material 52 side, is erected for positioning, and The remaining two side surfaces 54c and 54d
Is held by a fixing tool 57, and a material 54 is fixed to the fixing material 52 with a fixing bolt 56.

On the other hand, a high-strength bolt as shown in FIG. 7 has also been proposed as a positioning fixture in which the positioning means and the fixing means are integrated (conventional example 4). FIG. 7 is an exploded perspective view showing a configuration of a high-strength bolt already proposed,
FIG. 8 is an enlarged cross-sectional view showing a joined state with the high-strength bolt (see Japanese Patent Application Laid-Open No. 8-121445).

The high-strength bolt 100 is provided with a male screw portion 121 for screwing a nut 110 on one end side, and a bolt main body 120 having a tapered outer peripheral surface 122 on the other end side, the diameter of which is increased toward the tip thereof. A nut 110 that is screwed into the male screw portion 121 via a washer 140; and a tapered inner peripheral surface 132 that is inclined to match the tapered outer peripheral surface 122, and two materials 150,
It has one or more wedge bodies 130 with an outer peripheral surface 134 that frictionally contacts the inner peripheral surface of a bolt hole drilled in 160.

The high-strength bolt 100 described above uses a special tool to hold the pin tail 123 while holding the nut 11 in place.
By tightening 0 until the pin tail breaks,
The bolt body 120 is pulled up to a predetermined tightening torque, and the pulling force causes the wedge body 130 to act in the direction of pressing the inner peripheral surface of the bolt hole, resulting in the inner peripheral surface of the bolt hole and the outer peripheral surface of the wedge body 130. Are closely fixed by frictional force.

[0009]

However, the positioning fixture shown as the conventional example 1 has a positioning concave portion and a positioning concave portion due to a problem in processing accuracy and a difference in thermal expansion coefficient between the fixing material and the workpiece. A gap is generated between the projecting portion and the positioning accuracy of the fixing material and the work material is reduced. In addition, when mounting and dismounting is repeated many times, the positioning irregularities of the fixing material and the workpiece become worn, the gap between the two becomes larger, and as the number of mounting and dismounting increases, the centering accuracy deteriorates. Was becoming. Further, in order to provide the positioning convex portion on the material, it is necessary to turn the surface of the material to cut out the convex portion, so that it takes a lot of time for processing, and
The loss of materials was increased, which was a cause of cost increase.

In the positioning fixture shown as the conventional example 2, a gap is formed between the positioning pin hole and the positioning pin due to a problem in processing accuracy, a difference in thermal expansion coefficient between the fixing material and the workpiece. As a result, the positioning accuracy between the fixing material and the work material was reduced. In addition, when mounting and dismounting were repeated many times, wear occurred between the positioning pin hole and the positioning pin of the fixing material and the workpiece, the gap between them became larger, and the positioning accuracy deteriorated. . Further, since the positioning pin hole for drilling the fixing material and the workpiece needs to be processed at the same time, it has been a cause of an increase in manufacturing cost.

In the positioning fixture shown as the prior art example 3, when it is repeatedly attached and detached, the positioning pin is worn, and the fixing by the fixture is gradually weakened, so that the fixing material and the workpiece are misaligned. Caused the positioning accuracy to deteriorate. In addition, it is necessary to polish the two side surfaces of the workpiece on which the positioning pins are circumscribed, which causes an increase in manufacturing cost.

On the other hand, in the positioning fixture (high-strength bolt) shown as the prior art 4, the central axes of the bolt holes drilled in the two materials to be joined are made to coincide with each other so that both materials can be accurately positioned. Was required, but this task was not easy. That is, the positioning accuracy was reduced by the difference between the diameters of the two bolt holes. Moreover, a dedicated tool was required for mounting and dismounting, and the work was complicated.

Therefore, the present invention solves the problems of the conventional positioning fixture described above, improves the positioning accuracy of the fixing material and the work material, and enables the accurate positioning of the work material, as well as exclusive use. It can be used without tools,
An object of the present invention is to provide a positioning fixture that does not wear even if it is repeatedly attached and detached.

[0014]

In order to achieve the above object, the positioning fixture according to the first aspect of the present invention has an inner peripheral surface having a tapered shape in which the diameter is increased from the axial center toward both openings. A cylindrical outer ring, a first inner ring that has a bolt screw hole in the center, and has an outer circumference that expands from one end to the other end, and a bolt insertion hole in the center. Has a second inner ring formed in the same tapered shape as the first inner ring,
The inner ring and the second inner ring are fitted and inserted from both openings of the cylindrical outer ring so that the small diameter side faces each other, and the fastening bolt screwed into the bolt screw hole is the second inner ring. Of the first inner ring and is screwed into the bolt screw hole of the first inner ring.

The positioning fixture according to the second aspect of the present invention is the same as the positioning fixture according to the first aspect,
It is configured by providing a groove in the axial center of the outer peripheral surface of the cylindrical outer ring.

In use, the outer ring described above is divided into two parts at the center in the axial direction if the inner peripheral surface has a tapered shape in which the diameter increases from the center in the axial direction toward both openings. It does not matter even if it is a thing.

The inner ring which constitutes the present invention,
The material of the outer ring and the fastening bolt is not particularly limited, but depending on the material of the work material and the required joining strength, brass, cast iron, stainless steel, or other metal material, polyamide resin, or the like. So-called engineering plastics can be used.

[0018]

The positioning fixture of the present invention has the above-described structure, and thus exhibits the following unique action of the present invention.

First, according to the positioning fixture according to the first aspect of the present invention, the two inner rings are attracted by tightening the fastening bolts, and the tapered outer peripheral surface of the inner ring is accompanied by the tapered inner surface of the outer ring. It acts to push the peripheral surface outward. As a result, the outer peripheral surface of the expanded outer ring is pressed against the workpiece,
The two materials are accurately positioned and closely fixed.

According to the positioning fixture of the second aspect, in addition to the function of the positioning fixture of the first aspect, a groove is provided at the axial center of the outer peripheral surface of the outer ring. , The portion of the outer ring facing the first inner ring and the portion of the outer ring facing the second inner ring can be expanded at different expansion rates, and the diameters of the bolt holes drilled in the two materials are Even if the materials are slightly different or the materials of the two materials are different, it is possible to expand at a different expansion rate according to the material in which each part of the outer ring is circumscribed. It works to ensure a close contact.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A positioning fixture of the present invention will be described based on Embodiment 1 shown as an embodiment with reference to FIG.

First, as shown in FIG. 1, a positioning fixture 10 which is an embodiment of the present invention has a cylindrical shape in which an inner peripheral surface has a taper whose diameter increases from an axial center toward both openings. An outer ring 11, a first inner ring 12 having a bolt screw hole 12a on the inner circumference and a tapered surface 12b on the outer circumference from one end to the other end, and a bolt insertion hole 1 on the inner circumference.
3a, and a second inner ring 13 having an outer periphery formed with a tapered surface 13b having the same inclination rate as that of the first inner ring, and the first inner ring 12 and the second inner ring 13 Is inserted from both openings of the cylindrical outer ring 11 so that the small diameter side faces each other,
A fastening bolt 14 that is screwed into the bolt screw hole is inserted through the bolt insertion hole 13a of the second inner ring 13, and the bolt screw hole 1 of the first inner ring 12 is inserted.
It is configured by screwing with 2a.

Then, the positioning fixture 10 is loaded into the bolt holes drilled in the two materials 15 and 16 to be fixed, and the fastening bolts 14 are tightened, whereby the first inner ring 12 and the first inner ring 12 are fixed. The two inner rings 13 are pulled together, and accordingly, the tapered surfaces 12b and 13b of the two inner rings 12 and 13 act like wedges to push the tapered inner peripheral surface of the outer ring 11 outward. As a result, the outer diameter of the outer ring 11 is expanded, and the inner walls of the bolt holes of the materials 15, 16 and the outer peripheral surface of the outer ring 11 are in close contact with each other, and the material 15,
16 is fixed.

A groove 11a is formed in the outer peripheral surface of the outer ring 11 at a substantially central portion in the axial direction with a predetermined width being thin. By forming this groove 11a,
The outer ring 11 can be expanded at different expansion rates on the right side and the left side across the groove 11a.
Therefore, even when the diameters of the bolt holes drilled in the material 15 and the material 16 are slightly different, the corresponding portions of the outer ring 11 are expanded until they come into close contact with the bolt holes, respectively, and the material 15 , 16 and outer ring 1
1 and 1 are securely and closely fixed.

Therefore, even if the central axes of the two materials 15 and 16 are not exactly aligned, the two materials 15 and 16 will naturally be simply tightened by tightening the fastening bolts 14.
Is positioned and fixed.

Further, as shown in FIG. 2, the outer ring 11 is provided with slits 11b and 11c extending from the both open ends in the long axis direction, which are a little more than half the length of the long axis, at equal intervals in the circumferential direction. To be formed. By forming such a slit, the right side and the left side of the outer ring 11 can be expanded more flexibly at an arbitrary expansion rate, and can be applied to various materials. In the example shown in FIG. 2, two slits each having a width approximately equal to the thickness of the outer ring are formed from each opening end, that is, a total of four slits are formed so that each slit is circumferentially equidistant. However, the slit width and the number of slits are not particularly limited to these.

Next, a second embodiment which is another embodiment of the positioning fixture of the present invention will be described with reference to FIG. In this example, the cylindrical outer ring 21 has the same configuration as that of the first embodiment except that the outer ring 21 is divided at the center in the axial direction, and thus detailed description thereof will be omitted. By using the cylindrical outer ring 21 divided into two in this way, the cylindrical outer ring and the first to second inner rings are preliminarily loosely fitted and retained on the respective members 25 and 26 to be joined. It is possible to keep the inner ring and the outer ring in a place where they are frequently installed and removed.
There are merits such as easy management.

[0028]

EFFECTS OF THE INVENTION The positioning fixture of the present invention has the above-mentioned structure, so that it has the following effects peculiar to the present invention.

First, according to the positioning fixture according to the first aspect of the present invention, the two inner rings are attracted by tightening the fastening bolts, and accordingly, the tapered outer peripheral surface of the inner ring is tapered inside the outer ring. Since the outer peripheral surface of the expanded outer ring is pushed outward, the outer peripheral surface of the expanded outer ring is pressed against the inner wall of the bolt hole drilled in the two workpieces, so that the two workpieces are closely fixed. In addition, the fastening bolts are the same as general-purpose bolts, so a dedicated tool is not required for fastening operation, and a commercially available torque wrench can be used to easily position and fix multiple fastening points with uniform force. can do.

Further, according to the positioning fixture of the second aspect, in addition to the effect of the positioning fixture of the first aspect, a groove is provided at the axial center of the outer peripheral surface of the outer ring. , The portion of the outer ring facing the first inner ring and the portion of the outer ring facing the second inner ring can be expanded at different expansion rates, and the diameters of the bolt holes drilled in the two materials are Even if the materials are slightly different or the materials of the two materials are different, it is possible to expand at a different expansion rate according to the material in which each part of the outer ring is circumscribed. It can be surely positioned and fixed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a positioning fixture that is Embodiment 1 of the present invention.

FIG. 2 is a perspective view of an outer ring used in another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a positioning fixture that is Embodiment 2 of the present invention.

FIG. 4 is a plan view (a) and a sectional view (b) of the positioning fixture of Conventional Example 1.

FIG. 5 is a plan view (a) and a sectional view (b) of a positioning fixture of Conventional Example 2.

FIG. 6 is a plan view (a) and a cross-sectional view (b) of a positioning fixture of Conventional Example 3.

FIG. 7 is a perspective view showing an assembled state of a positioning fixture of Conventional Example 4.

FIG. 8 is a cross-sectional view showing a usage state by a positioning fixture of Conventional Example 4.

[Explanation of symbols]

10, 20 ・ ・ ・ Positioning fixture 11, 21 ... Cylindrical outer ring 11a, 21a ... Groove 11b, 11c ... slits 12, 22 ・ ・ ・ First inner ring 12a, 22a ... Bolt screw holes 12b, 22b ... Tapered surface 13, 23 ・ ・ ・ Second inner ring 13a, 23a ... Bolt insertion hole 13b, 23b ... Tapered surface 14, 24 ... Fastening bolts 15, 25 ... Substrate 16, 26 ... 30, 40, 50 ・ ・ ・ Positioning fixture 32, 42, 52 ... Fixing material 34, 44, 54 ... Substrate 36, 46, 56 ・ ・ ・ Fixing bolt 48, 58 ・ ・ ・ Positioning pins 100 ・ ・ ・ High strength bolt 110 ... Nut 120 ... Bolt body 121 ・ ・ ・ Male thread 122 ... Tapered outer peripheral surface 123 ・ ・ ・ Pin tail 130 ... Wedge body 132 ... Tapered inner peripheral surface 140 ... Washer 150, 160 ... Substrate

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3C016 HA04                 3J001 FA02 GA02 GB01 HA02 HA07                       JB03 JB12 KA12 KA19                 3J022 DA11 EA02 EB02 EC02 ED02                       FA01 FA05 FB04 FB10 FB12                       FB17 GA04 GA12 GB02 GB03

Claims (2)

[Claims] 1. A device for positioning and fixing two workpieces, wherein the device has a cylindrical outer ring in which an inner peripheral surface has a tapered shape whose diameter increases from an axial center toward both openings. A first inner ring having a bolt screw hole in the center and a tapered outer peripheral surface whose diameter increases from one end to the other end; and a bolt insertion hole in the center, the outer peripheral surface having A first inner ring and a second inner ring formed in the same taper shape, wherein the first inner ring and the second inner ring are both of the cylindrical outer ring so that the smaller diameter side faces each other. A fastening bolt, which is fitted and inserted from the opening and is screwed into the bolt screw hole, is inserted from a bolt insertion hole of the second inner ring,
Positioning fixture characterized by being screwed into a bolt screw hole of the inner ring of. 2. The positioning fixture according to claim 1, wherein a groove is provided at a center of an outer peripheral surface of the cylindrical outer ring in an axial direction.