JP4506892B1 - Gap inspection method and jig - Google Patents

Abstract

An operator can easily and immediately determine whether an object gap is within a tolerance.
A first cylindrical roll 4 having an outer diameter having an outer diameter of a tolerance upper limit value of a joint opening of a steel sheet pile, and an outer diameter having an outer diameter of a tolerance lower limit value of a joint opening of the steel sheet pile. The inspection jig 1 of the present invention in which the second cylindrical roll 5 is linearly arranged so that the end faces thereof are parallel to each other is used. The first roll 4 and the second roll 5 are arranged so that the axial direction of the first and second rolls 4 and 5 is parallel to the slit direction of the opening a of the joint A of the steel sheet pile. Whether the opening a is within a predetermined tolerance is checked by inserting or contacting it from a direction orthogonal to a.
[Effect] The operator can easily and immediately determine whether or not the gap of the object satisfies a predetermined tolerance, thereby improving the efficiency of the inspection work. In the case of sampling inspection, a large number of locations can be inspected within a predetermined time, which is useful for quality control.
[Selection] Figure 2

Description

  The present invention relates to a method for inspecting whether a gap (gap) of an object satisfies a predetermined tolerance, and an inspection jig used therefor. In particular, the present invention relates to a method for inspecting whether or not the opening of the claw (joint) is within a tolerance in a production line for a sheet pile (steel sheet pile or the like), and a jig used for the inspection.

  Generally, a caliper or a gap gauge is used as a means for measuring the gap between objects. If these measuring instruments are used, it is possible to accurately measure the gap. For this gap, a tolerance (control range) is determined, and in order to check whether the tolerance is satisfied, whether the operator or computer is within the upper and lower limits of the tolerance based on the measured value The process of judging is necessary.

  For example, JIS A 5528 defines hot rolled steel sheet piles in addition to chemical components and mechanical properties, as well as shapes, dimensions, tolerances, and the like. In particular, the joint must have a structure that can be sufficiently engaged when driven and can be easily detached when pulled out, and can be as watertight as possible. Accordingly, the dimensions of the joint claw opening and the like are precisely defined by the manufacturer.

  Conventionally, when measuring the opening size of the nail, it is common for an operator to measure the opening size of the nail using a caliper at an inspection site. A technique for measuring online using a non-contact type measuring instrument has been proposed (Patent Document 1).

  The apparatus of Patent Document 1 is arranged at the top and bottom of the stopped structural steel, and horizontally and vertically moved at the front end of the biaxial stage mechanism to turn at least 180 degrees horizontally to horizontally cross-section the structural steel. A detection head with a built-in laser displacement meter capable of detection in each of the vertical and oblique directions is attached.

  Then, each dimension value and partial profile of the section steel are calculated and displayed from the measured value of the laser displacement meter, the position of the biaxial stage mechanism, and the direction of the detection head.

  On the other hand, although it is a contact-type measuring apparatus, Patent Document 2 discloses an apparatus that measures the claw opening of a steel sheet pile with high accuracy without variation of measurement values by an operator.

  In the apparatus of Patent Document 2, the measuring head is attached to a rotatable roller group that is in contact with the side surface of the steel sheet pile at three points so that the relative distance from the roller group can be adjusted. A claw member and a magnescale for measuring the amount of movement of the claw member are arranged close to each other.

  The measuring head is always in a horizontal state with a spring. During measurement, the measuring head is mounted so that it can be swung and swung freely along the side surface. The measuring head can be moved toward and away from the side surface and moved up and down. This is a possible configuration.

  Further, Patent Document 3 discloses a caliper for improving the efficiency of measuring the dimensions of a steel sheet pile joint by an operator.

  This caliper measures the interval between the recesses such as the joint of the steel sheet pile and the wall thickness of the recesses at the same time. The second slider is provided so as to be slidable in the longitudinal direction of the first slider.

  The main scale has a measurement jaw that contacts one inner wall of the recess, the first slider has a measurement jaw that contacts the other inner wall across the recess, and the second slider includes: It has a jaw that contacts the outside of the wall of the recess.

  Further, the main scale has a main scale, the first slider has a vernier scale serving as an auxiliary scale for the main scale, and the main scale for the second slider, the second slider. Is provided with a vernier scale serving as an auxiliary scale with respect to the main scale.

  Patent Document 4 discloses an inspection gauge for a control rod guide tube having a large-diameter portion having a predetermined inner diameter and a small-diameter portion having an inner diameter smaller than the large-diameter portion by a required amount. This inspection gauge comprises a large diameter through gauge that matches the required diameter of the inner diameter of the large diameter portion and a small diameter through gauge that matches the required diameter of the small diameter portion. These are integrally formed corresponding to the arrangement of the large diameter portion and the small diameter portion.

  However, the devices of Patent Literature 1 and Patent Literature 2 require a large capital investment. Even if equipment is introduced, in order to prevent erroneous measurement due to equipment failure, continuous maintenance of the equipment is also required.

  The caliper of Patent Document 3 has the convenience that the operator can simultaneously measure the opening degree of the joint and the thickness of the joint. However, after measuring the opening of the joint, it takes time to record the measured value and time to judge whether the measured value satisfies a predetermined tolerance, and in terms of work efficiency of the inspection. There's a problem.

  That is, even if the rolling efficiency of the steel sheet pile is increased in order to increase productivity, it takes time to make a pass / fail judgment of the joint opening of the steel sheet pile in the inspection process, so one worker can do it within a certain time. The number of inspections (the number of joint measurement points) is naturally limited. In other words, in order to achieve inspection efficiency commensurate with rolling efficiency, it must be handled by increasing the number of workers. Conversely, when the number of workers is limited, the inspection efficiency becomes a bottleneck, leading to a situation where the overall production efficiency is reduced.

  Moreover, although the inspection gauge of patent document 4 can be used for the dimension inspection of the inner diameter of a pipe or a hole, it is not suitable for the dimension inspection of the gap of the object which consists of a substantially plane which faces a steel sheet pile joint. This is because the inspection gauge does not have a structure suitable for being inserted into a gap such as a steel sheet pile joint.

JP-A-7-120225 Japanese Utility Model Publication No. 5-27608 JP 2006-258597 A Japanese Patent Laid-Open No. 5-273281

  The problem to be solved by the present invention is that, in the case of a conventional inspection apparatus, an operator can easily and immediately determine whether a gap (gap) of an object satisfies a predetermined tolerance (control range). It is a point that cannot be done.

The gap inspection method of the present invention is
To allow an operator to easily and immediately determine whether an object gap meets a given tolerance,
Ellipsoid, abacus bead, cylindrical, conical shape, truncated cone shape, polygonal pyramid shape, truncated polygonal cone shape, elliptical columnar shape, truncated elliptical cone shape, facing each other A first part of a columnar body having a cross-sectional shape in which semicircles of the same radius are connected by a straight line, the upper limit of the tolerance of the slit-shaped gap being the maximum section length, and an ellipsoid, an abacus bead, a cylinder, Conical shape, shape with truncated cone tip, polygonal pyramid shape, shape with truncated polygonal pyramid tip, elliptic cylinder shape, shape with truncated elliptical cone tip, crossing semicircular circles with the same radius connected in a straight line A second part of a planar columnar body having a maximum sectional length that is the lower limit of the tolerance of the slit-shaped gap is set in a direction in which the directions of the maximum cross sections are parallel to each other and perpendicular to the maximum cross sections. Using the inspection jig of the present invention arranged linearly,
A direction orthogonal to the slit-like gap direction in a state where the first part and the second part are positioned in a direction in which the direction of each maximum cross section is parallel to the slit-like gap direction. The most important feature is that the inspection is performed by inserting or making contact.

  In the present invention, the directions of the respective maximum cross sections having the upper limit value and the lower limit length of the tolerance of the slit-shaped gap between the first part and the second part are parallel to each other and orthogonal to the respective maximum cross sections. Since the depth of the claws of the target steel sheet pile is not deep, it cannot be inspected when arranged in series.

  In the present invention, the maximum cross-sectional length is intended to mean the maximum length in the direction of the slit-like gap when the first part and the second part of the inspection jig are inserted into or contacted with the slit-like gap.

  In the present invention, since the operator can easily and immediately determine whether or not the gap between the objects satisfies a predetermined tolerance, the efficiency of the inspection work can be improved. Further, in the case of sampling inspection, it is possible to inspect a large number of locations within a predetermined time compared to the conventional method, which is useful for quality control.

It is the figure which showed an example of the inspection jig of this invention. It is explanatory drawing of the inspection method using the inspection jig of this invention when the opening degree of the joint of a steel sheet pile is in the size tolerance, (a) is the contact of the first and second rolls to the opening of the joint (B) is a diagram showing a state in which the first roll is in contact with the joint opening, (c) is a diagram showing a state in which the second roll has started entering from the joint opening, d) is a diagram showing a state in which the second roll has completed entry into the joint. It is explanatory drawing of the other example of the test | inspection method using the test jig | tool of this invention, (a) is when the opening degree of a joint is larger than the upper limit of a dimension tolerance, (b) is the opening degree of a joint of a dimension tolerance. It is a figure in case it is smaller than a minimum. It is the figure which showed the other example of the inspection jig of this invention. (A)-( h ) is a figure explaining the example of the other shape which can be used as a 1st, 2nd components, and is the figure which looked at the paper surface right side from the front, respectively, and the paper surface left side is the figure seen from the side surface. .

  In the present invention, for the purpose of enabling an operator to easily and immediately determine whether the gap of an object is within the tolerance, the first component having the maximum sectional length as the upper limit value of the tolerance of the slit-like gap is provided. The second component having the maximum cross-sectional length as the lower limit value of the tolerance is realized by linearly arranging in the direction in which the directions of the maximum cross sections are parallel to each other and orthogonal to the maximum cross sections.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention together with a new idea of the present invention will be described below using the accompanying drawings.

  The inventors have determined that each maximum cross section having a predetermined length has two parts arranged linearly in a direction orthogonal to each maximum cross section and in which the direction of each maximum cross section is parallel to each other. It has been found that it is possible to determine whether or not the gap of the object is within the tolerance by moving in a direction orthogonal to the direction, and the present invention has been completed.

  Hereinafter, the best mode of the present invention using a cylindrical roll having a predetermined outer diameter as a component in which a maximum cross section of a predetermined length is linearly arranged in a direction orthogonal to the cross section will be described with reference to FIG. I will explain.

  Reference numeral 1 denotes an inspection jig according to the present invention for inspecting whether a slit-shaped gap, for example, the opening of a joint of a steel sheet pile is within tolerances. The rolls 4 and 5 are attached so that they can rotate freely. The rolls 4 and 5 are preferably attached to the core rods 2 and 3 so that the rolls 4 and 5 having other outer diameters can be replaced.

  Among these, the 1st roll 4 is formed so that the outer diameter may become the tolerance upper limit of the said joint opening. Moreover, the 2nd roll 5 is formed so that the outer diameter may become the tolerance lower limit value of the joint opening.

  The first roll 4 and the second roll 5 are attached to the case 6 so that the end faces thereof are parallel to each other, for example, the axes of the first roll 4 and the second roll 5 are aligned. It has been.

  In the example shown in FIG. 1, both the first and second rolls 4 and 5 are attached to the case 6 so as to be movable by a predetermined amount in a direction orthogonal to the axis of the rolls 4 and 5, and are springs. 7 and 8 are urged to protrude most with respect to the case 6.

  Therefore, even if the rolls 4 and 5 move during the inspection, they are returned to their original positions by the restoring force of the springs 7 and 8 after they are taken out from the joint opening after the inspection is completed.

  The inspection jig 1 of the present invention is configured as described above, and a method for inspecting, for example, the opening of a steel sheet pile joint using the inspection jig 1 will be described with reference to FIG.

  The inspection jig 1 according to the present invention is configured so that the axial directions of the first and second rolls 4 and 5 are parallel to the slit direction of the opening a of the joint A of the steel sheet pile. The first and second rolls 4 and 5 are moved close to the opening a of the steel sheet pile joint A (FIG. 2A).

  When the inspection jig 1 of the present invention is further moved in the above direction, the first roll 4 comes into contact with the opening a of the joint A (FIG. 2B). When the inspection jig 1 of the present invention is moved in this direction from this state, the first roll 4 remains in contact with the opening a of the joint A and only the second roll 5 is opened. The approach to a is started (FIG.2 (c)).

  When the inspection jig 1 of the present invention is further moved in the above-described direction, the second roll 5 completes its entry into the joint A (FIG. 2 (d)).

  As a result of this inspection, the first roll 4 formed such that the outer diameter becomes the tolerance upper limit value of the joint opening degree stopped in contact with the opening a of the joint A. On the other hand, the second roll 5 formed so that the outer diameter becomes the tolerance lower limit value of the joint opening degree has completed the entry of the joint A into the opening a. Therefore, it is determined that the joint opening is within the tolerance.

  On the other hand, when the first roll 4 formed so that the outer diameter becomes the tolerance upper limit value of the joint opening can be inserted into the opening a of the joint A (FIG. 3A), the joint opening is performed. The degree is greater than the upper limit of tolerance and is judged to be out of tolerance. Further, when the second roll 5 formed so that the outer diameter becomes the tolerance lower limit value of the joint opening cannot be inserted into the opening a of the joint A (FIG. 3B), the joint opening is not within the tolerance. Judged to be smaller than the lower limit and out of tolerance.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the example of FIG. 1, both the first roll 4 and the second roll 5 are urged by the springs 7 and 8 in the direction perpendicular to the axis of the rolls 4 and 5, but either one as shown in FIG. Only one roll 4 or 5 may be provided with a spring. Further, the first roll 4 and the second roll 5 do not have to be provided with a spring.

  However, when a spring is provided only on the second roll 5 or when both the rolls 4 and 5 are not provided with a spring, the second roll 5 is always more open than the first roll 4 at the joint opening. It is necessary to arrange it so as to be located on the upstream side in the insertion direction (the lower side in FIG. 1).

  Moreover, what is necessary is just to let the length of the axial direction of the 1st roll 4 and the 2nd roll 5 be an appropriate length according to the parallel part (slit) length of the opening part of the joint which is a test object. When the parallel part length is short, the appearance may be a ring-shaped cylindrical body. If the length of the cylinder is made longer than necessary, the weight of the inspection jig becomes heavy, and in the case of manual inspection work, workability deteriorates and the manufacturing cost of the inspection jig is high, so it should be avoided. .

  In addition, in the invention example shown in the accompanying drawings, cylindrical rolls 4 and 5 are used as the first and second parts. However, instead of the cylindrical roll, other shapes such as shown in FIG. These parts may be used.

5 (a) and 5 ( b) are ellipsoids, ( c ) is an abacus bead, ( d ) is a cone, and ( e ) is a shape obtained by cutting the tip of the cone. Further, an elliptic cylinder as shown in FIG. 5 ( f ), a shape obtained by cutting the tip of the elliptical cone as shown in ( g ), and semicircles of the same radius arranged oppositely as shown in ( h ) are connected by straight lines. It may be a columnar body having a cross-sectional shape.

In the case of the shape as shown in FIGS. 5 (a) to 5 (g), the slits are in line contact with each other. Therefore, in the case of a product with severe wear or in a use environment, the maximum cross-sectional length is reduced, and parts of the inspection jig can be replaced. I need it. However, in the case of a shape having a parallel section with the maximum cross-section length as shown in FIG. 5 ( h ), the change in the maximum cross-section length due to wear does not change until all the parallel sections are worn, so it can be used stably for a long time. It is possible and preferable.

  Although not shown in the drawing instead of the cylindrical roll, a polygonal pyramid shape such as a quadrangular pyramid or a shape obtained by cutting the tip of the polygonal pyramid shape may be used.

   The present invention as described above is not limited to the inspection of the opening degree of the joint portion of the steel sheet pile, but can be applied to the inspection of any object gap (gap).

DESCRIPTION OF SYMBOLS 1 Inspection jig 4 1st roll 5 2nd roll 7 Spring 8 Spring

Claims (8)

A method for inspecting whether a slit-like gap is within a predetermined tolerance,
Ellipsoid, abacus bead, cylindrical, conical shape, truncated cone shape, polygonal pyramid shape, truncated polygonal cone shape, elliptical columnar shape, truncated elliptical cone shape, facing each other A first part having a maximum cross-sectional length that is an upper limit of tolerance of the slit-shaped gap of a columnar body having a cross-sectional shape formed by connecting semicircles of the same radius with straight lines ;
Ellipsoid, abacus bead, cylindrical, conical shape, truncated cone shape, polygonal pyramid shape, truncated polygonal cone shape, elliptical columnar shape, truncated elliptical cone shape, facing each other A second part having a maximum cross-sectional length that is a lower limit value of the tolerance of the slit-shaped gap of a columnar body having a cross-sectional shape formed by connecting semicircles of the same radius with straight lines ;
A state in which the directions of the maximum cross sections are parallel to each other and linearly arranged in a direction orthogonal to the maximum cross sections, and the directions of the maximum cross sections are parallel to the slit-like gap direction. The inspection method is characterized in that the inspection is performed by inserting or making contact from a direction orthogonal to the slit-shaped gap direction.   Of the two parts, a part having a maximum cross-sectional length of the tolerance lower limit length can be inserted into the slit-shaped gap, and a part having the maximum cross-sectional length of the tolerance upper limit value 2. The inspection method according to claim 1, wherein the slit-shaped gap is determined to be within a tolerance when the slit-shaped gap cannot be inserted into the slit-shaped gap.   Of the two parts, a part having the maximum cross-sectional length of the tolerance upper limit value can be inserted into the slit-shaped gap, or a part having the maximum cross-sectional length of the tolerance lower limit value 2. The inspection method according to claim 1, wherein when the slit-like gap cannot be inserted into the slit-like gap, it is determined that the slit-like gap is out of tolerance. A jig for inspecting whether the slit-shaped gap is within a predetermined tolerance,
Ellipsoid, abacus bead, cylindrical, conical shape, truncated cone shape, polygonal pyramid shape, truncated polygonal cone shape, elliptical columnar shape, truncated elliptical cone shape, facing each other A first part having a maximum cross-sectional length that is an upper limit of tolerance of the slit-shaped gap of a columnar body having a cross-sectional shape formed by connecting semicircles of the same radius with straight lines ;
Ellipsoid, abacus bead, cylindrical, conical shape, truncated cone shape, polygonal pyramid shape, truncated polygonal cone shape, elliptical columnar shape, truncated elliptical cone shape, facing each other A second part having a maximum cross-sectional length that is a lower limit value of the tolerance of the slit-shaped gap of a columnar body having a cross-sectional shape formed by connecting semicircles of the same radius with straight lines ;
The maximum cross-section directions are parallel to each other and linearly arranged in a direction orthogonal to the maximum cross-section, and are used by being inserted or contacted from a direction orthogonal to the slit-shaped gap direction. Inspection jig.   At least the first part is provided so as to be movable in the insertion direction into the slit-like gap, and in one movement limit position, the insertion or contact direction into the slit-like gap is greater than that of the second part. The inspection jig according to claim 4, wherein the inspection jig is located on the downstream side.   6. The inspection jig according to claim 5, wherein at least the first part is biased by a spring so as to be positioned upstream of the slit-shaped gap in the insertion or contact direction.   The inspection jig according to claim 4, wherein the first and second parts are configured to be replaceable.   The first component and the second component are cylindrical rolls each having a maximum cross section having a length of an upper limit value or a lower limit value of a tolerance of the slit-shaped gap, each having an outer diameter. The inspection jig according to any one of claims 4 to 7.

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