JP3051772U - Measurement target jig - Google Patents

Abstract

(57) [Problem] To provide a measurement target jig that can be accurately mounted without performing operations such as deburring around a hole edge of a target mounting portion of a target to be measured. SOLUTION: In a jig 1 of a target used for measuring a position by being fitted into a hole formed by machining in an object to be measured, a cut is made around a joint portion between a plug 2 and a flange 3 thereof. A space (a) that can avoid an interference object such as a burr (b) is formed in a state in which a portion (gouge portion 5) is provided and is attached to the hole 11 at the measurement position.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a target to be attached to a measurement point mainly used for measuring a large structure or a member constituting the large structure.Specifically, the target is correctly attached to a hole formed at a measurement point position. It relates to a jig for a measurement target that can be used.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, when inspecting dimensions of a structure formed by machining or welding, or performing simulation based on measured data, measurement is performed using an optical measuring instrument or a CCD camera. In this measurement, a reflection type target is generally used. As shown in FIGS. 5A and 5B, when the object to be measured is a structure such as a beam girder such as a bridge as shown in FIGS. 5A and 5B, the target 100 is directly inserted into a mounting hole for connection. There is a structure in which a reflection target 103 is attached to the surface of a plug 101 provided with a flange portion 102 that is fitted to the center of a hole. Alternatively, as shown in FIGS. 6 (a), 6 (b) and 6 (c), a protrusion 104 is provided on the upper surface of a plug 101 similar to that described above, and a side surface of the protrusion 104 is provided with a hole. There is a target 105 having a structure in which the center of the reflection target 103 is aligned at a position offset from the center.

[0003]

[Problems to be solved by the invention]

 Normally, in the type used by being mounted in a hole such as the target 100 or 105 described above, an object to be measured (for example, a bridge girder) has dozens of holes in one member. The target must be prepared by fitting the target into each of these holes, but the state of the holes to be mounted is often such that burrs are formed on the periphery of the holes due to the drilling process. When the plug 105 is fitted into the hole 107, as shown schematically in FIG. 7, for example, the surface of the flange portion 102 of the target 100 comes into contact with the burr 108 remaining on the edge of the hole, and the plug 101 is not fitted properly. Since the mounting surface of the reflective target 103 is mounted with an inclination, no matter how accurate the target is, the measurement point may be shifted from the center of the hole, and the measurement accuracy may be reduced. There is a problem of a decrease.

[0004] From such a situation, conventionally, it is necessary to file the edge of the hole for mounting the target with a file to remove the burrs. However, performing deburring work on dozens of holes with one member requires a great deal of labor, and such work requires manual labor. The problem is that it is inconvenient. In addition, since such a work of removing burrs by hand is inefficient in terms of time, for example, if a work of shaving with a grinder or the like is performed, a glossy surface is formed on the surface of the object to be measured. In this case, when the measurement is performed by an automatic machine having an image processing function, there is a possibility of erroneous recognition and a problem occurs in the reliability of the measured value.

The present invention has been made in order to solve such a problem, and it is possible to accurately mount a hole edge portion of a target mounting portion of a measured object without manually performing deburring work. It is an object of the present invention to provide a jig for a measurement target as described above.

[0006]

[Means for Solving the Problems and Functions / Effects]

 In order to achieve the above-mentioned object, a jig for a measurement target according to the present invention is a target jig used for measuring a position by being fitted into a hole formed by machining in an object to be measured. 3. The method according to claim 1, wherein a notch is provided around a joint between the plug and the flange of the jig.

[0007] The jig of the measurement target of the present invention, which is constructed as described above, is directly fitted into a hole which has been machined by a drill or the like when it is mounted on a hole serving as a measurement position of a large structure or the like. However, even if it is used, it is desirable to provide a notch at the joint between the plug and the flange of the jig, so even if burrs are attached to the periphery of the hole, etc. Since burrs can be avoided in the space formed by the target, the target can be correctly attached to the position indicated on the drawing, and the target position does not shift. Therefore, it is possible to omit processing work for preparing to use a file etc. around the mounting hole before mounting the target jig, and to perform accurate and accurate measurement, improving the reliability of measurement. This has the effect of doing so.

[0008] The notch provided as a means for avoiding an interference object such as a burr provided at the joint between the plug and the flange in the jig of the target is designed so that the joint between the plug and the flange is constricted. It should be formed. In addition, the constricted portion as the cut portion is formed so that the base of the plug is constricted by a required amount over the entire circumference, and a concave notch having a diameter larger than the diameter of the plug and having an appropriate depth is provided on the flange portion side. Good to do. In this way, when the target jig is mounted in the hole serving as the measurement position, even if burrs during processing adhere to the inner peripheral portion of the hole or the mounting surface side, the neck portion of the plug and the flange portion side The burrs can be avoided in the space defined by the recessed portions of the above to allow proper mounting. In addition to this, a constricted portion is provided only at the base of the plug in the jig, or a concave notch with a required dimension is provided on the flange side while leaving the base of the plug as it is. When the target jig is installed in the hole at the measurement position, a space is formed at the junction between the base of the plug and the flange to allow for interference such as burrs. Improvement can be achieved.

[0009]

[Embodiment of the invention]

 Next, a specific embodiment of the measuring target jig according to the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged sectional view of a jig for a measurement target according to the present embodiment. The jig 1 of the target has a plug 2 and a flange 3 which are made of metal and have a diameter suitable for a target mounting hole, and are formed in the same manner as the conventional one, and are provided at the center of the upper surface of the flange 3. The reflection target 4 is attached to the upper surface of the concave portion 3 'so as to coincide with the center axis of the plug 2 so that the center of the reflection target 4 is located.

A constricted portion 5 is formed at the joint between the plug 2 and the flange portion 3 in the jig 1 of the target. The constricted portion 5 has a small diameter 2 'by appropriately sloping the base of the plug 2 in the direction of the lower surface 3 "of the flange 3 so that the lower surface 3" of the flange 3 is larger than the outer diameter of the plug 3. It is cut into an appropriate depth with a diameter to form a concave notch 3 a, so that a space is formed around the base of the plug 2. Incidentally, if a specific example of the constricted portion 5 in such a target jig 1 is to be mounted in a hole of φ16 mm, the dimension of the small diameter 2 ′ portion of the plug 2 is φ11 mm, The diameter of 3a is 20 mm in diameter, 3 mm in depth, and the total length of the constriction is 6 mm.

In the target jig 1 having such a configuration, the plug 2 is inserted into a hole 11 at a measurement position provided on the object 10 to be measured as shown in FIG. In the case of mounting, the space a by the constricted portion 5 is formed around the joint portion between the plug 2 and the flange portion 3 of the jig 1 of the target inserted into the hole 11, and the space Even if the burr b exists in the portion, the interference at the time of mounting by the burr b is avoided by the space a, and the burr b comes into contact with the lower surface 3 ″ of the flange portion 3 so that the burr b can be securely mounted. Naturally, the reflection target 4 attached to the surface of the jig 1 (the concave surface 3 'is provided on the measurement surface to bring the center of the target on the measurement surface) is located at the center of the hole to be measured. Will do.

FIG. 3 shows another example of the target jig in a state where the target jig is attached to the measurement position of the object to be measured. The target jig 1A of this embodiment has a constricted portion 5 'formed only at the base 2a of the plug 2 at the junction between the base 2a of the plug 2A and the flange portion 3. In the other portions, the same portions as those in the above embodiment are denoted by the same reference numerals, and detailed description is omitted (the same applies hereinafter).

In the target jig 1A having such a configuration, when the plug 2A is inserted into the hole 11 at the measurement position provided on the object 10 to be measured and mounted, the target jig 1A is repaired. A space a is formed at the entrance portion of the hole between the hole 11 into which the constricted portion 5 'provided on the base 2a of the plug 2A of the tool 1 is inserted. Even if there is, if it is pushed by the lower surface 3 "of the flange portion 3 and moves to the space a, it can be mounted correctly.

FIG. 4 shows another example of a target jig in a state where the target jig is attached to a measurement position of an object to be measured. In the jig 1B of the target of this embodiment, at the joint portion between the base portion 2b of the plug 2B and the flange portion 3, only the flange portion 3 is provided with a concave notch (cut portion) 3b at the base portion of the plug 2B. It is formed with a diameter larger than 2b.

In the target jig 1B having such a configuration, when the plug 2B is inserted into the hole 11 at the measurement position provided on the object 10 to be measured in use and mounted, a flange portion is provided on the upper peripheral portion of the hole 11 3, a space a is formed by the cut portion 3b. Therefore, in the target jig 1B, due to the space a formed between the flange portion 3 and the surface of the measured object 10, foreign matter such as burrs remains on the edge of the hole 11 to be mounted. Is also avoided and can be mounted correctly.

As described above, according to these jigs for the target, when mounting the holes for position measurement provided on the object to be measured, the holes need not be subjected to any special processing such as deburring the holes beforehand. In addition, since burrs and the like adhering to the edge of the hole can be avoided on the jig side, workability is remarkably improved, and since it can be mounted correctly, the reliability of the measurement is also improved. It works. In addition, the jig of this target has the above-mentioned effects with a simple structure, and is not complicated at the time of manufacture. Therefore, it can be provided at a low cost and helps to reduce the cost required for measurement. Things.

The constricted portion or cut portion of the target jig may be formed in a concentric circle or a rectangular shape while the plug body is cylindrical, as long as the strength is not hindered. I do not care about the external shape. In the above-described embodiment, the reflection target is provided on the surface of the concave portion provided on the upper surface. However, a protrusion is provided on the upper surface of the stopper or on the upper surface of the stopper, and the protrusion is provided. The same is true for the structure where the center of the reflection target is aligned with the side surface offset from the center of the hole.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a jig for a measurement target according to the present embodiment.

FIG. 2 is a diagram illustrating a use mode of a jig of a measurement target.

FIG. 3 is a longitudinal sectional view showing another example of a target jig mounted on a measurement position of an object to be measured.

FIG. 4 is a vertical cross-sectional view showing another example of a target jig attached to a measurement position of an object to be measured.

FIG. 5 shows an example of a conventional target jig.
(A) is a side view, (b) is a plan view.

FIG. 6 shows another example of a conventional target jig.
(A) is a side view, (b) is a right side view of (a), and (c) is a plan view.

FIG. 7 is a schematic diagram illustrating a problem when a conventional target jig is mounted in a hole at a measurement position.

[Explanation of symbols]

 1, 1A, 1B Target jig 2, 2A, 2B Plug 3 Flange 3a, 3b Depressed notch 3 'Recess provided on upper surface of flange 3 "Lower surface of flange 4 Reflective target 5, 5' Neck 10 Measurement object 11 Measurement position hole a Space b Burr

Continued on the front page (72) Inventor Toshiaki Kondo 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Manufacturing Co., Ltd.

Claims (2)

[Utility model registration claims] 1. A target jig used for measuring a position by being fitted into a hole formed by machining in an object to be measured, wherein a jig is cut around a joint portion between a plug of the jig and a flange portion. A jig for a measurement target, characterized by having a part. 2. The measurement target jig according to claim 1, wherein the cut portion is formed so that a joint between the plug and the flange is constricted.