JP6800535B2 - Block gauge jig and extrusion device - Google Patents

Description

The present invention relates to a jig that defines a measurement point of a block gauge used when calibrating a length measuring instrument such as a digital micrometer, and an extrusion device that pushes out a block gauge housed in the jig.

Digital micrometer (see Patent Document 1) is widely used at manufacturing sites as a length measuring instrument for measuring the dimensions of machined parts and the like. The digital micrometer may have an error depending on the measurement environment such as the temperature of the place where it is used and the change with time. Therefore, it is necessary to calibrate the digital micrometer before the measurement work.

Here, calibration means measuring the difference between the dimension displayed by the digital micrometer and the length of an object that is a standard length. A block gauge, which is a standard length, is used for calibration of the digital micrometer. Calibrate the digital micrometer by measuring the length-defined block gauge with the digital micrometer with high accuracy, and if necessary, set the digital micrometer so that the digital micrometer displays the true value. Can be adjusted.

Jikkai Sho 55-174101

The work of measuring a block gauge with a digital micrometer and calibrating the digital micrometer is generally carried out on a daily basis by a specific calibration worker such as a worker who uses the digital micrometer or a calibrator. .. Since the calibration worker tries to perform the calibration in the same manner every time, the anvil and the spindle of the micro gauge are likely to be repeatedly applied to a specific part of the block gauge. Then, the specific portion of the block gauge is unevenly worn.

As the wear increases, the worn part is no longer suitable for calibration. However, it is possible to calibrate sufficiently by using other parts of the block gauge. Nevertheless, the calibration worker uses the worn part in an attempt to maintain the calibration conditions. Therefore, it is uneconomical to have the calibration worker use a new block gauge in order to correctly perform the calibration work.

The present invention has been made in view of such a problem, and an object of the present invention is a block gauge capable of defining a measurement point of the block gauge at the time of calibration using the block gauge and improving the life of the block gauge. To provide a jig for use.

According to one aspect of the present invention, it is a block gauge jig that defines a measurement point of a block gauge used for calibrating a length measuring instrument, and the block gauge jig is a housing for accommodating the block gauge. And a part of the housing so as to define an opening provided in the housing and allowing the block gauge to be taken in and out of the housing, and a measurement point of the block gauge housed in the housing. It is characterized in that a pair of notches formed by notching is provided, and a pair of surfaces of the block gauge used for calibrating the length measuring instrument are each exposed from the pair of notches. A jig for a block gauge is provided.

In one aspect of the present invention, the block gauge jig may further include a window portion that exposes the length display characters printed on the block gauge. Further, it is an extrusion device for pushing out a block gauge housed in the block gauge jig, and includes a base and a protrusion protruding from the base, and the protrusion is the said of the block gauge jig. Extruding having a function of extruding the block gauge housed in the block gauge jig from the block gauge jig by being pierced through an insertion hole formed on a surface facing the opening. The device is also an aspect of the present invention.

The jig for a block gauge according to one aspect of the present invention has a housing capable of accommodating the block gauge. The housing is formed with an opening through which the block gauge can be taken in and out, and a pair of notches that define a measurement location of the block gauge. A part of the block gauge housed in the block gauge jig through the opening is exposed from the pair of notches.

When calibrating a length measuring instrument such as a digital micrometer, an anvil and a spindle are applied to the exposed portion of the pair of notches of the block gauge for measurement. At this time, the unexposed portion of the block gauge cannot be used for calibration of the digital micrometer. That is, the block gauge jig defines a measurement point in the measurement of the block gauge for calibration of the digital micrometer. Therefore, the measurement location is controlled regardless of the intention of the calibration worker.

After calibrating the digital micrometer using the block gauge housed in the block gauge jig a predetermined number of times, for example, the block gauge is taken out from the block gauge jig and treated for another block gauge. Store in a jig. Here, the cutout portion of the other block gauge jig is formed at a position different from the formation position of the cutout portion of the original block gauge jig. Then, the part used for calibrating the digital micrometer of the block gauge can be changed.

In this way, by using the jig for the block gauge, it is possible to specify the part used for calibrating the digital micrometer of the block gauge regardless of the intention of the calibration worker. It can be used for calibration. Therefore, it is not necessary to replace the block gauge because only a specific part of the block gauge is worn, so that the life of the block gauge can be extended.

Therefore, according to one aspect of the present invention, there is provided a jig for a block gauge capable of defining a measurement point of the block gauge at the time of calibration using the block gauge and improving the life of the block gauge.

It is a perspective view which shows typically the jig for a block gauge and a block gauge. It is a perspective view which shows typically the jig for the block gauge which housed the block gauge. It is a top view explaining the calibration work of a digital micrometer using a block gauge housed in a block gauge jig. It is a perspective view which shows an example of the jig for a block gauge schematically. FIG. 5 (A) is a perspective view schematically showing a block gauge jig accommodating a block gauge with the bottom facing upward, and FIG. 5 (B) is a perspective view schematically showing an extrusion device. It is a figure. It is a perspective view which shows typically the taking out of a block gauge from a jig for a block gauge using an extrusion device.

An embodiment according to the present invention will be described. First, the block gauge housed in the block gauge jig according to the present embodiment will be described with reference to FIG. FIG. 1 schematically shows the block gauge 1.

The block gauge 1 is used for calibrating a length measuring instrument such as a digital micrometer. The block gauge 1 is formed in a substantially rectangular parallelepiped shape, and a set of facing parallel surfaces constituting the rectangular parallelepiped is used for calibration of a length measuring instrument. The pair of parallel faces facing each other are finished so as to have a specific distance from each other with extremely high accuracy, and the distance between the parallel faces serves as a reference for the length. On the side surface of the block gauge 1, a length display 3 indicating a reference length value provided by the block gauge 1 is printed.

Since the block gauge 1 serves as a reference for the length, a hard material such as ceramic having a small volume change with respect to a temperature change is used. However, when the digital micrometer is repeatedly calibrated using the block gauge 1, the block gauge 1 is worn by the contact with the anvil or the spindle of the digital micrometer, and the distance between the parallel surfaces changes. Will end up. Therefore, when the block gauge 1 is worn to some extent, it is necessary to end the use of the block gauge 1 and use a new block gauge 1.

The calibration work using the block gauge 1 is generally performed by a worker using a digital micrometer or a calibration worker such as a calibrator before or after the measurement work using the digital micrometer. Carry out on the way. Since the calibration worker wants to carry out the measurement stably, he tries to carry out the calibration work in the same manner every time. Then, a specific portion of the block gauge 1 is likely to be repeatedly used for calibration work, and the portion is likely to be unevenly worn.

Although the non-weared portion can be used for the subsequent calibration work, the calibration worker continues to use the worn portion, so it is necessary to replace the block gauge 1. Replacing the block gauge 1 while leaving a part that can be used for calibration shortens the life of the block gauge, which is uneconomical.

Therefore, the block gauge 1 is housed in the block gauge jig according to the present embodiment and used for calibration work. Next, the block gauge jig will be described. FIG. 1 schematically shows the block gauge jig 2.

The housing of the block gauge jig 2 has a substantially rectangular parallelepiped hollow structure, and the size of the housing is formed according to the size of the block gauge 1. That is, the housing is formed in a shape and size that can accommodate the block gauge 1. A material such as acrylic resin or fluororesin is used for the housing so that the block gauge 1 is not damaged such as scratches and wear when the block gauge 1 is taken in and out. Then, for example, it is formed by a method such as injection molding or 3D printing.

The housing of the block gauge jig 2 is formed with an opening 4 formed over one surface of the housing that allows the block gauge 1 to be taken in and out. The opening 4 is formed on, for example, the upper surface of the housing of the block gauge jig 2, and the block gauge can be accommodated in the block gauge jig 2 from above through the opening 4.

Further, the housing of the block gauge jig 2 is formed with a pair of notch portions 6 that define the measurement points of the block gauge 1. The pair of notch portions 6 are formed in a size such that the anvil or spindle of the digital micrometer can be applied to the block gauge 1 housed in the block gauge jig through the notch portions.

FIG. 2 shows a perspective view schematically showing a block gauge jig 2 accommodating the block gauge 1. As shown in FIG. 2, a window 8 is provided on the side surface of the block gauge jig 2 at a position corresponding to the length display 3 of the block gauge 1, and the length display 3 is seen from the outside through the window 8. It becomes visible.

In order to prevent the housed block gauge 1 from being easily taken out at the calibrator's own discretion, the housing should be sized so that the housed block gauge 1 does not protrude from the opening 4. It is preferably formed. Alternatively, the housing may be formed in a size such that the block gauge 1 protrudes from the opening 4 so that the block gauge 1 can be easily taken out in order to improve workability.

Further, as shown in FIG. 2, the housed block gauge 1 is exposed to the outside from the pair of notch portions 6. The calibration worker calibrates the digital micrometer using the exposed portion of the block gauge 1. Calibration of the digital micrometer will be described with reference to FIG. FIG. 3 is a top view for explaining the calibration work of the digital micrometer using the block gauge 1 housed in the block gauge jig 2.

The digital micrometer 5 shown in FIG. 3 has a frame 13 including a U-shaped portion when viewed from above and a protruding portion protruding from one end of the U-shaped portion. Anvil 7 is arranged on one side of the frame 13 and a spindle 9 is arranged on the other side of the frame 13 so as to be aligned on the axis with the space inside the U-shaped portion interposed therebetween. The spindle 9 is supported by the frame 13 so as to be movable in the axial direction.

A thimble 15 that can rotate in the circumferential direction of the protruding portion is provided on the protruding portion of the frame 13. The thimble 15 is mechanically connected to the spindle 9, and when the thimble 15 is rotated, the spindle 9 moves in the axial direction. A display portion 11 is provided on a protruding portion of the frame 13 at a position between the spindle and the thimble 15. The display unit 11 displays the value of the distance between the spindle 9 and the anvil 7 according to the position of the spindle 9.

The length measurement by the digital micrometer 5 is carried out by sandwiching the object to be measured between the spindle 9 and the anvil 7. At this time, since the object to be measured may be deformed according to the force of the spindle 9 and the anvil 7 sandwiching the object to be measured, the object to be measured may be deformed with a constant force for highly accurate length measurement. It is necessary to sandwich it. Therefore, a ratchet stop 17 that can rotate in the circumferential direction of the frame is provided at the tip of the protruding portion of the frame 13. By rotating the ratchet stop 17, the thimble 15 can be rotated.

When the operator holds the ratchet stop 17 and rotates the thimble 15 when moving the spindle 9 in the axial direction, the ratchet stop 17 runs idle when the pinching force reaches a predetermined value when the object to be measured is pinched. It is designed to do. Therefore, when the thimble 15 is rotated by holding the ratchet stop 17, the object to be measured is pinched by a constant force.

Here, an error may occur in the value displayed on the display unit 11. Therefore, in order to carry out accurate measurement, it is necessary to calibrate the digital micrometer 5 using the block gauge 1. As shown in FIG. 3, since the block gauge 1 is exposed by the pair of notches 6 of the block gauge jig 2, the spindle 9 and the anvil 7 are calibrated by hitting the exposed portions of the block gauge 1 respectively. Can be carried out.

The unexposed portion of the block gauge 1 is not used for calibration by the block gauge jig 2. That is, by using the block gauge jig 2, it is possible to specify the measurement point used for calibrating the block gauge 1. When the exposed portion of the block gauge 1 is repeatedly used for calibration work, the exposed portion gradually wears, so that the function as a standard length is lost. Therefore, after performing the calibration work a predetermined number of times, it is necessary to carry out the calibration work using another part of the block gauge 1.

Here, the block gauge jig 2a, which is another configuration example of the block gauge jig 2, will be described with reference to FIG. FIG. 4 is a perspective view schematically showing the block gauge jig 2a. The pair of notch portions 6a of the block gauge jig 2a shown in FIG. 4 are formed at a height different from the pair of notch portions 6 of the block gauge jig 2 shown in FIG. 1 and the like.

For example, when the pair of notch portions 6 of the block gauge jig 2 shown in FIG. 1 and the like are formed at a height near the center of the block gauge jig 2, the block gauge jig 2a shown in FIG. 4 A pair of notch portions 6a are formed at a height other than the vicinity of the center. More specifically, it is formed at a height close to the opening 4 on the upper surface.

Then, when the block gauge 1 is housed in the block gauge jig 2a, the block gauge 1 is exposed from the pair of notch portions 6a, but the exposed portion is exposed when the block gauge jig 2 is used. Different from the location.

Therefore, after the calibration is performed a predetermined number of times using the block gauge jig 2, the block gauge 1 is taken out from the block gauge jig 2 and the block gauge 1 is housed in the block gauge jig 2a. For example, calibration can be performed using a non-wearing portion of the block gauge 1. Since the calibration worker has no choice but to perform the calibration using the exposed portion of the block gauge 1, there is no risk of performing the calibration using the worn portion. Therefore, the block gauge 1 can be continuously used for calibration without replacing the block gauge 1.

Further, after repeated calibration using the block gauge jig 2a and the exposed portion from the pair of notch portions 6a is worn, the block gauge 1 is taken out once and turned upside down to turn the block gauge 1 upside down. Is again housed in the block gauge jig 2a. Since the pair of cutouts 6a are not formed at a height near the center of the block gauge jig 2a, the pair of cutouts 6a are different from the parts that were exposed before being turned upside down. Exposed from. Therefore, the block gauge 1 can be continuously used for calibration.

A window 8a and a window 8b are provided on the side surface side of the housing of the block gauge jig 2a. The window 8a and the window 8b are formed at a height corresponding to the length display 3 of the block gauge 1, and when the block gauge 1 is housed in the block gauge jig 2a, the length of the block gauge 1 is formed. The display 3 becomes visible from the outside through any of the windows.

In this way, by using the jig for the block gauge, the portion of the block gauge used for calibrating the digital micrometer can be defined. Therefore, it is not necessary to replace the block gauge because only a specific part of the block gauge is worn. Therefore, the life of the block gauge can be extended, which is economical.

Next, the removal of the block gauge 1 from the block gauge jig 2 will be described with reference to FIGS. 5 (A), 5 (B), and FIG. The block gauge 1 can be easily taken out by using the extrusion device 12 shown in FIG. 5 (B).

FIG. 5A is a perspective view schematically showing the bottom 10 side of the block gauge jig 2. As shown in FIG. 5A, an insertion hole 10a is formed in the bottom portion 10 of the block gauge jig 2. The extrusion device 12 shown in FIG. 5B includes a rod-shaped protrusion 16 protruding upward from the flat plate-shaped base 14, a pair of guide walls 18 erected from both sides of the flat base 14, and a pair of guide walls 18. Is arranged.

The insertion holes 10a of the block gauge jig 2 and the protrusions 16 of the extrusion device 12 are formed in the same number and in shapes corresponding to the positions corresponding to each other. For example, the insertion hole 10a is formed in a circular shape or a polygonal shape, and the protrusion 16 is formed in a columnar shape or a polygonal columnar shape corresponding to the shape of the insertion hole 10a. At this time, the insertion hole 10a is formed to be larger than the cross-sectional shape of the protrusion 16.

The pair of guide walls 18 are formed so that the distance between them corresponds to the width of the block gauge jig 2 (distance between both side surfaces). Each of the pair of guide walls 18 is formed in such a size that each protrusion 16 is hidden by the guide wall 18 when the extrusion device 12 is viewed from the side.

For the extrusion device 12, for example, a material such as an acrylic resin or a fluororesin is used. The base 14, the protrusions 16, and the pair of guide walls 18 are integrally formed by, for example, injection molding or 3D printing. However, since a large force is applied to the protrusion 16, the protrusion 16 may be made of a high-strength material such as metal, and the protrusion 16 may be incorporated into the base 14 to make the extrusion device 12.

FIG. 6 is a perspective view schematically showing the removal of the block gauge 1 from the block gauge jig 2 using the extrusion device 12. The block gauge jig 2 is positioned above the push-out device 12 with the bottom 10 facing the base 14 of the push-out device 12. At this time, the insertion hole 10a is positioned above the protrusion 16 of the extrusion device 12. The pair of guide walls 18 assists in aligning the block gauge jig 2 in the width direction.

Next, the block gauge jig 2 is lowered toward the extrusion device 12. Then, the protrusion 16 is inserted into the insertion hole 10a, and the protrusion 16 hits the block gauge 1 housed in the block gauge jig 2 and supports the block gauge 1. Then, since the block gauge 1 is lowered while the block gauge 1 is lowered, the block gauge 1 is relatively pushed up and can be pushed out from the block gauge jig 2 and picked up.

Here, for example, when the extrusion device 12 does not have the guide wall 18, when the positions of the block gauge jig 2 and the extrusion device 12 are misaligned, the protrusion 16 has the extrusion device 12 A force directed in the width direction is applied, and the protrusion 16 may be damaged. On the other hand, in the extrusion device 12 having the guide wall 18, the guide wall 18 has the width on the protrusion 16 in order to align the position of the block gauge jig 2 and the extrusion device 12 in the width direction. No force is applied in the direction, and damage to the protrusion 16 can be suppressed.

In this way, when the extrusion device 12 is used, the block gauge 1 can be easily taken out from the block gauge jig 2.

The extrusion device 12 can be used for various types of block gauge jigs 2 that accommodate block gauges of different sizes. For example, as shown in FIG. 6, for a block gauge jig 2 accommodating a block gauge having a nominal size of an extrusion device (distance between surfaces used for calibration) of 50 mm, three protrusions 16 are used. Push out the block gauge. Further, for example, for a block gauge jig for accommodating a block gauge having a nominal size of 10 mm, the block gauge is pushed out using one of the three protrusions 16.

The present invention is not limited to the description of the above embodiment, and can be implemented with various modifications. For example, in the above embodiment, the length display 3 of the block gauge 1 can be visually recognized from the outside through the window portion 8 of the block gauge jig 2, but the present invention is not limited to this. For example, if the type of the block gauge to be accommodated in the block gauge jig 2 is determined in advance, it is not necessary to provide the window portion 8 in the block gauge jig 2, and in that case, the block gauge jig 2 The length display may be printed on the housing of 2.

Further, in the above embodiment, the surface of the block gauge used for calibration is divided into three regions by using two block gauge jigs having different cutout forming positions, and each region is exposed in order. An example of using a jig for a block gauge has been described. The present invention is not limited to this, and for example, the surface of the block gauge may be divided into five regions, and a block gauge jig may be used so that each region is exposed in order.

In this case, three block gauge jigs having different positions for forming the notch portions are prepared. That is, a block gauge jig having a notch that exposes the central region of the five regions, and a block gauge jig having a notch that exposes one region adjacent to the central region. , Prepare a jig for a block gauge having a notch that exposes the outermost region. Using three block gauge jigs, the five regions are exposed in order.

Similarly, four block gauge jigs may be prepared, the surface of the block gauge may be divided into seven regions, and the block gauge jig may be used so that each region is exposed in order. As described above, a plurality of block gauge jigs having different notched portions can be used in combination within a range in which the micrometer anvil and spindle can access the surface of the block gauge.

In addition, the structure, method, etc. according to the above-described embodiment can be appropriately modified and implemented as long as they do not deviate from the scope of the object of the present invention.

1 Block gauge 3 Length display 5 Digital micrometer 7 Anvil 9 Spindle 11 Display part 13 Frame 15 Rotating part 17 Ratchet stop 2,2a Block gauge jig 4 Opening 6, 6a Notch 8, 8a, 8b Window 10 Bottom 10a Insertion hole 12 Extruder 14 Base 16 Protrusion 18 Guide wall

Claims (3)

It is a jig for block gauges that defines the measurement points of block gauges used for calibrating length measuring instruments.
The block gauge jig includes a housing for accommodating the block gauge, an opening provided in the housing for allowing the block gauge to be taken in and out of the housing, and the block gauge housed in the housing. It is provided with a pair of notches formed by notching a part of the housing so as to define the measurement location of the housing.
A jig for a block gauge, characterized in that a pair of surfaces of the block gauge used for calibrating the length measuring instrument are each exposed from the pair of notches. The jig for a block gauge according to claim 1, further comprising a window portion for exposing the length display characters printed on the block gauge. An extrusion device for pushing out a block gauge housed in the block gauge jig according to the first and second aspects.
It is provided with a base and a protrusion protruding from the base.
The protrusion is pierced through an insertion hole formed on a surface of the block gauge jig facing the opening, so that the block gauge housed in the block gauge jig can be treated for the block gauge. An extruding device characterized by having a function of extruding from a tool.