JP4907431B2 - Inner diameter measurement nozzle - Google Patents

Description

  The present invention relates to an inner diameter measurement nozzle that ejects a fluid supplied from an air micrometer toward a measurement location.

  Conventionally, when measuring the inner diameter of the target hole, an air micrometer is used, and an inner diameter measuring nozzle 801 as shown in FIG. 3 is connected to the air micrometer.

  As shown in FIG. 3A, the inner diameter measurement nozzle 801 includes a connection portion 811 connected to the air micrometer, and a nozzle portion 812 extending from the connection portion 811. The nozzle portion 812 is configured to be inserted into the target hole.

  As shown in FIGS. 3A and 3B, a pair of jet outlets 814 and 814 for jetting the fluid supplied from the air micrometer are provided on the side surface 813 of the nozzle portion 812. The fluid ejected from the ejection ports 814 and 814 is ejected to the inner wall surface of the target hole, and the back pressure is measured by the air micrometer to determine the separation distance from the ejection ports 814 and 814 to the inner wall surface. It is comprised so that the internal diameter of the said object hole can be measured by measuring.

  On the side surface 813 of the nozzle portion 812, relief grooves 821,... Linearly extending in the axial direction are provided at four locations, and the side surface 813 of the nozzle portion 812 and the inner surface of the target hole The fluid ejected during the period is allowed to escape along the escape grooves 821,.

  However, in such an inner diameter measuring nozzle 801, relief grooves 821,... Extending linearly in the axial direction are formed at four positions on the side surface 813 of the nozzle portion 812.

  For this reason, in the circumferential direction of the nozzle portion 812, the region extending in the axial direction is divided into a place where the escape groove 821 is formed over the entire area and a place where the escape groove 821 is not present at all. The part 812 could not be centerless processed.

  In order to solve this problem, when the outer shape reference processing is performed on the nozzle portion 812, as shown in FIG. 3C, a temporary center 831 is provided at the tip of the nozzle portion 812. It was used for surface processing and centerless processing.

  For this reason, the temporary center 831 has to be removed after the outer shape reference processing of the nozzle portion 812, and there is a problem that it takes time.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an inner diameter measurement nozzle capable of increasing the processing efficiency.

In order to solve the above-mentioned problem, in the inner diameter measuring nozzle of the present invention, on the side face directed to the right side with respect to the central axis of the nozzle portion inserted into the target hole for measuring the inner diameter with an air micrometer , In an inner diameter measurement nozzle provided with an outlet for ejecting the supplied fluid toward a target location and an escape groove for releasing the fluid ejected from the outlet, the escape groove is formed on the side surface of the nozzle portion. It was formed in a spiral shape that advances in the axial direction while rotating in the circumferential direction.

  That is, a relief groove for escaping fluid ejected from the ejection port is formed on the side surface of the nozzle portion inserted into the target hole, and this relief groove rotates in the circumferential direction along the side surface of the nozzle portion. However, it is formed in a spiral shape that advances in the axial direction.

  For this reason, in the predetermined area | region extended in an axial direction, the site | part comprised that the whole area | region is the said escape groove can be eliminated.

  As described above, in the inner diameter measuring nozzle of the present invention, the relief groove formed on the side surface of the nozzle portion is formed in a spiral shape, so that the entire region of the predetermined region extending in the axial direction is the relief groove. The site | part comprised by can be eliminated.

  As a result, when the outer shape reference processing of the nozzle portion is performed, the tool can be brought into contact with any part of the side surface avoiding the escape groove in a predetermined region in the axial direction. It can be surely prevented.

  For this reason, when the outer shape reference processing is performed on the nozzle portion, the surface processing of the nozzle portion can be performed without providing a temporary center at the tip of the nozzle portion as in the prior art.

  Therefore, compared with the conventional case where a temporary center had to be provided at the tip of the nozzle portion, the trouble of removing the temporary center after the outer shape reference processing is unnecessary, and the number of man-hours during processing can be reduced. Processing efficiency can be increased.

  In addition, it is possible to simultaneously process a step, and the accuracy can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an inner diameter measuring nozzle 1 according to the present embodiment, and the inner diameter measuring nozzle 1 is used when measuring the inner diameter of a target hole.

  FIG. 1 shows a nozzle portion 11 of the inner diameter measuring nozzle 1, and a connection portion connected to, for example, an air micrometer is attached to the proximal end of the nozzle portion 11. Thereby, while receiving supply of the air as a fluid from the air micrometer connected to this connection part, the back pressure can be measured with the said air micrometer.

  The nozzle portion 11 is formed in a vertically long columnar shape, and a tapered portion 21 whose diameter decreases toward the tip is formed at the tip.

  Here, in the present embodiment, the inner diameter measuring nozzle 1 having the size shown in FIG. 1 will be described as an example. However, the length and outer dimensions are not limited to this, and are set according to the measurement target. Shall be.

  As shown in FIG. 2A, the nozzle portion 11 is formed with an air supply path 31 through which air is supplied, and the nozzle portion 11 is formed with the air supply path 31. The hollow portion 32 and the solid solid portion 33 constituting the tip end side thereof. The air supply path 31 is configured to open to the base end surface of the nozzle portion 11, and is configured to supply air from the air micrometer through the opening.

  The air supply path 31 extends to the vicinity of the tip of the nozzle portion 11, and at the tip thereof, as shown in FIG. A pair of spouts 42, 42 extending toward the end are connected. Both jet outlets 42, 42 are provided at symmetrical positions with the central axis 41 as the center, and open to the side surface 43 of the nozzle portion 11.

  As a result, the air supplied from the air micrometer via the air supply path 31 is ejected from the two outlets 42 and 42 toward the inner wall surface as the target portion of the target hole, and the back pressure is also increased. Is measured by the air micrometer so that the distance from each of the jet nozzles 42 and 42 to the inner wall surface can be measured, and the inner diameter of the target hole can be measured.

  As shown in FIG. 1 and FIG. 2 (b), the side surface 43 of the nozzle portion 11 has clearance grooves 51,... For escaping air ejected from the ejection ports 42, 42 at equal intervals. There are four recesses (shown as slanted in FIG. 1). Each of the escape grooves 51,... Is formed in a V-shaped cross section with its apex facing the central axis 41, and its angle is set to approximately 90 degrees.

  Further, as shown in FIG. 1, each escape groove 51,... Is formed in a spiral shape that advances in the axial direction while rotating in the circumferential direction along the side surface 43 of the nozzle portion 11. Thereby, the side surface 43 part between adjacent escape grooves 51 and 51 is formed in a spiral-shaped ridge shape, and the jet nozzle 42 is formed at the portion of the side surface 43 formed between the escape grooves 51 and 51. It has been established.

  Then, as shown in FIG. 2 (c), a step portion 62 that is one step lower than the general portion 61 is formed at a predetermined width dimension at the portion of the side surface 43 where the jet port 42 is formed. As shown in FIG. 1, the stepped portion 62 is connected to the escape grooves 51, 51 provided on both sides.

  As shown in FIG. 2C, V grooves 71 and 71 are formed on both side edges of the stepped portion 62, and the jet port 42 is formed between the paired V grooves 71 and 71. The center of the stepped portion 62 is disposed.

  Thereby, a jet portion 81 is formed on the side surface 43 of the nozzle portion 11 by the jet port 42, the stepped portion 62, and the V grooves 71, 71, and the nozzle portion 11 is inserted into the target hole. In this state, the air supplied between the stepped portion 62 and the inner wall surface of the target hole is passed through the stepped portion 62 and the V grooves 71, 71 to the relief grooves 51, 51 on both sides. While flowing in, it is comprised so that it can discharge | emit outside from the said object hole via each escape groove 51,51.

  In the present embodiment according to the above configuration, escape grooves 51,... For escaping the air ejected from the ejection ports 42, 42 are formed on the side surface 43 of the nozzle portion 11 inserted into the target hole. The escape grooves 51 are formed in a spiral shape that advances in the axial direction while rotating in the circumferential direction along the side surface 43 of the nozzle portion 11.

  For this reason, in the predetermined area | region extended in an axial direction, the site | part comprised in the whole area | region by the said escape grooves 51, ... can be eliminated. Thereby, when the outer shape reference processing of the nozzle part 11 is performed, the tool can be brought into contact with any part of the side surface 43 avoiding the escape grooves 51,... In a predetermined region in the axial direction. , Can be reliably prevented from falling into the escape grooves 51.

  For this reason, when performing the external shape reference processing on the nozzle portion 11, the surface processing of the nozzle portion 11 can be performed without providing a temporary center at the tip of the nozzle portion 11 as in the prior art.

  Therefore, as compared with the conventional case where a temporary center has to be provided at the tip of the nozzle portion 11, the labor of removing the temporary center after the outer shape reference processing is not required, and the number of man-hours during processing can be reduced. , Processing efficiency can be increased.

  In addition, the stepped portion 62 and the V-grooves 71 and 71 constituting the jet portion 81 can be simultaneously processed, and the accuracy can be improved.

It is a side view which shows one embodiment of this invention. (A) Sectional drawing which shows the principal part of the embodiment, (b) Sectional drawing along the AA line of FIG. 1, (c) Enlarged view showing the section of the jet outlet portion of the embodiment. . (A) Side view showing a conventional inner diameter measuring nozzle, (b) Cross-sectional view of the main part of the conventional example, (c) Cross-sectional view showing a state where a temporary center is provided in the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner diameter measurement nozzle 11 Nozzle part 41 Central axis 42 Jet nozzle 43 Side surface 51 Escape groove

Claims (1)

An ejection port for ejecting the supplied fluid toward the target location on the side surface directed to the side perpendicular to the central axis of the nozzle portion inserted into the target hole for measuring the inner diameter with an air micrometer, and the jet In the inner diameter measuring nozzle provided with a relief groove for escaping the fluid ejected from the outlet,
The inner diameter measuring nozzle, wherein the escape groove is formed in a spiral shape that advances in the axial direction while rotating in the circumferential direction along the side surface of the nozzle portion.

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