JP5033672B2 - Male screw measuring device and judging device - Google Patents

Description

  The present invention relates to a male screw measuring device for measuring the helical shape of a screw portion of a male screw, and a male screw determining device for determining whether or not the screw portion conforms to a standard.

  Conventionally, in the inspection for determining whether or not the screw portion of the male screw conforms to the standard, the spiral shape of the screw portion is measured. In this inspection, a screw gauge having a shape conforming to the standard is brought into contact with the side peripheral surface of the screw portion of the screw to be measured along the axial direction of the screw portion, so that the spiral shape matches the screw gauge shape. Whether or not was measured visually.

  However, in such an inspection, a large number of screw gauges are prepared in advance according to the standard, the necessary screw gauges are selected at the time of measurement, and it must be performed manually, and the measurement is troublesome. . In addition, since the measurement is performed with the screw gauge repeatedly contacting the outer surface of the male screw, the measurement is likely to be worn and inaccurate. It was difficult to measure and inspect many male screws.

  Patent Document 1 below proposes a screw discrimination device that can measure the shape of a male screw automatically in a non-contact state.

In this screw discrimination device, laser light is irradiated, the outer diameter and pitch of the screw part are measured from the projected image, a lead is obtained by calculation based on the measurement result, and the measurement part is angled according to the lead angle. The spiral shape data is obtained by measuring the shape of the screw portion along the lead angle.
Japanese Patent Laid-Open No. 6-147834

  However, in such a conventional device capable of automatic measurement, in order to measure the spiral shape, the measurement unit must be inclined according to the lead angle, the structure of the measurement device is complicated, and the measurement takes a long time. It was easy.

  Accordingly, an object of the present invention is to provide a male screw measuring device capable of measuring the helical shape of the screw portion in a non-contact state with a simple structure in a short time, and also using this measuring device. It is another object to provide a pass / fail judgment device.

  The male screw measuring device according to claim 1, wherein the male screw measuring device measures the shape of the screw portion with projection light obtained by irradiating the screw portion of the male screw with measurement light. A support portion that supports the male screw in a state in which the screw portion protrudes, an irradiation portion that can irradiate the measurement light from one side of the screw portion, and an axis of the screw portion obtained by the measurement light And calculating the vertical distance between the detection position of the screw portion corresponding to the outer edge and the axis of the screw portion by calculating the vertical distance between the detection portion and the axis of the screw portion. And a processing unit for obtaining a radius of the spiral shape of the unit.

  The male screw measuring device according to claim 2 is the configuration according to claim 1, wherein the processing unit includes a first radius of a first detection position of the outer edge, and the first detection position. Finds the second radius of the second detection position shifted by half rotation and n + 0.5 (n is an integer), and adds the first radius and the second radius to the screw. The diameter of the spiral shape of the part is obtained.

  The male screw measuring device according to a third aspect of the present invention has the configuration according to the second aspect, wherein the first detection position and the second detection position are a top part of a screw thread of the screw part and / or It is the bottom of the screw groove.

  According to a fourth aspect of the present invention, in the male screw measuring device, in addition to the configuration according to any one of the first to third aspects, the processing unit averages the vertical distances of the plurality of detection positions to calculate the radius. Alternatively, an average of diameters is obtained.

  A male screw determination device according to a fifth aspect includes the male screw portion measurement device according to any one of the first to fourth aspects, wherein the determination data stored in a storage unit and the radius of the spiral shape or A determination unit that compares the diameter and determines pass / fail is provided.

  According to the first aspect of the present invention, the detection position of the screw part is detected by the outer edge of the projection image having the maximum cross-sectional shape along the axis of the screw part obtained by the measurement light, and the detection position and the axis of the screw part are detected. Since the radius is determined by the vertical distance between them, the radius of the spiral shape can be measured in a non-contact state with the screw portion, and since the radius is measured, it is easy without being affected by the lead existing in the screw portion. With this configuration, the spiral shape of the screw portion can be measured in a short time.

  According to the second aspect of the present invention, the first radius of the first detection position of the outer edge and the first detection position are shifted from each other by a half rotation and shifted by n + 0.5 (n is an integer) pitch. Since the second radius of the second detection position is obtained, the first detection position and the second detection position can be measured from the same direction by the irradiation unit and the detection unit without rotating the screw portion. The helical shape of the screw part can be measured. In addition, since the first radius and the second radius are added to obtain the spiral shape diameter of the screw portion, the spiral shape of the screw portion can be obtained with a simple configuration without being affected by the lead existing in the screw portion. Diameter can be measured.

  According to the invention of claim 3, since the first detection position and the second detection position are the top of the screw thread of the screw part or the bottom of the screw groove of the screw part, the first detection position is detected in the detection part. It is easy to clearly identify the position and the second detection position, and to measure accurately.

  According to the invention described in claim 4, since the radius or diameter is obtained by averaging the vertical distances of the plurality of detection positions, the measurement result can be stabilized and easily compared.

  According to the male screw determination device of the fifth aspect, since the male screw portion measuring device according to any one of the first to fifth aspects is used to calculate the spiral radius or diameter of the screw portion. The spiral shape of the screw portion can be measured in a short time with a simple structure, and the measurement result is compared with the determination data stored in the storage unit to determine pass / fail. From measurement to pass / fail judgment can be performed automatically.

  [Embodiment 1]

  Embodiments of the present invention will be described below.

  FIG. 1 shows a main part of a male screw measuring device provided with the measuring device of this embodiment.

  The measuring device 20 of the male screw 10 is disposed on the base portion 22, a support portion 21 that can support the male screw 10 with the screw portion 13 protruding, and the male screw 10 supported by the support portion 21. And a measuring unit 30 for measuring the helical shape of the screw part 13.

  First, as shown in FIG. 2, the male screw 10 to be measured is a variety of screws such as screws and bolts in which a screw thread 15 and a screw groove 16 are formed in a spiral shape, and has a head. You do not have to. Preferably, the line connecting the tops of the plurality of screw threads 15 and the bottoms of the plurality of screw grooves 16 is parallel to the axis L of the screw part 13. This is because the axis L can be easily grasped.

  The support portion 21 includes a support portion 23 fixed directly or indirectly to the base portion 22 and a chuck portion 25 provided on the support portion 23, and a support piece that can be opened and closed in the radial direction provided on the chuck portion 25. 27, the head 11 of the male screw 10 can be fixed and opened.

  The support portion 21 is configured such that when the chuck portion 25 supports the head portion 11 of the male screw 10, the axis L of the screw portion 13 is arranged in parallel with the axis of the base portion 22. Here, the axis L is oriented in a predetermined direction by supporting the end surface on the screw portion 13 side of the head 11 of the male screw 10 by the step portion 27 a on the end portion side of the support piece 27.

  The measurement unit 30 receives an irradiation unit 31 that can irradiate the screw part 13 of the male screw 10 supported by the support unit 21 with measurement light, and projection light of the screw part 13 formed by the measurement light from the irradiation unit 31. And a detecting unit 35 for performing the above operation.

  The irradiation unit 31 emits measurement light such as a belt-shaped laser beam in response to a signal from a signal line 33 from a control unit (not shown), and is in a direction orthogonal to the axis L from one side surface side of the screw unit 13. In this way, the measurement light can be irradiated.

  In the band-shaped measuring light, the band thickness is sufficiently thinner than the screw thread 15 and the screw groove 16 of the screw part 13. The width of the band is preferably wider than the height of each screw thread 15. When the screw thread 15 and the screw groove 16 are continuously measured by moving the screw part 13 and the measurement part 30 relative to each other, the measurement part 30 intersects the axis L according to the shape of the screw thread 15 and the screw groove 16. This is because it is not necessary to move in the direction of movement, and the accuracy can be easily improved. In this embodiment, the band width is larger than the maximum spiral diameter of the screw portion 13 so that the screw threads 15 on both sides can be measured.

  The detection unit 35 receives a projection image formed by a part of the measurement light in the width direction being shielded by the screw part 13 and the remaining part passing through the side of the screw part 13, and detects the shielded part. The outer edge of the projected image can be detected by the boundary with the part that reaches the unit 35 as projection light. Here, since the measurement light is irradiated from one side of the screw portion 13, the projection image has a maximum cross-sectional shape with respect to the measurement light of the screw portion, that is, a cross-sectional shape including the axis L of the screw portion 13. Yes.

  The detection unit 35 detects the outer edge of the projection image formed in a state where the arbitrary detection position of the screw part 13 is the edge of the maximum cross-sectional shape, so that the outer edge corresponding to the detection position is detected. Detection data indicating the position is generated. This detection data is, for example, a current or the like when the detection unit 35 is composed of a photoelectric conversion element.

  Detection data detected by the detection unit 35 is configured to be transmitted to a processing unit (not shown) via a signal line 37.

  The irradiation unit 31 and the detection unit 35 need to be aligned so as to oppose each other with high accuracy. In the measurement apparatus 20, the irradiation unit 31 and the detection unit 35 change relative positions of each other. It can be moved relative to the screw part 13 without being moved. Specifically, it can move up and down on a movable member (not shown) that can move in parallel with the axis of the base part 22 and the axis L of the screw part 13. It is fixed and installed.

  Next, a method for measuring the helical shape of the male screw 10 with such a measuring device 20 will be described.

  First, the head portion 11 of the male screw 10 is fixed to the chuck portion 25 of the support portion 21. At this time, the stepped portion 27a of the support piece 27 is engaged with the end surface of the head portion 11 of the male screw 10 on the screw portion 13 side so that the axis L of the screw portion 13 is parallel to the axis of the base portion 22. Fix it. In order to make the axis L accurately parallel to the axis, it may be fixed using, for example, a centering jig.

  Next, by irradiating the detection position of the screw portion 13 with the band-shaped measurement light from the irradiation unit 31, a projection image having the maximum cross-sectional shape of the screw portion 13 is formed, and the detection light is received by the detection unit 35. Here, the detection position refers to various parts such as the top part of the screw thread 15, the bottom part of the screw groove 16, and the inclined surface of the screw groove 16 that require machining accuracy and the like in the screw part 13. In order to detect the detection position as the outer edge of the projection image, the measurement light may be irradiated with the screw portion 13 supported by the support portion 21 so that the detection portion is the edge of the maximum cross-sectional shape. Since the screw part 13 has the same spiral shape in the circumferential direction, the side peripheral surface of the screw part 13 has no directionality, and therefore measurement is performed with the male screw 10 supported by the support part 21 in an arbitrary direction. Each position corresponding to the outer edge of the projection image formed by light can be adopted as the detection position.

  When the projection light is received by the detection unit 35, the position of the outer edge of the projection image corresponding to the detection position of the screw unit 13 is detected by the detection unit 35 as a boundary due to the presence or absence of the projection light, and based on this, the current, etc. Detection data is generated. Since the measurement light consists of light that does not substantially diffuse and the various distances in the screw portion 13 and the various distances in the projection image coincide with each other, the position detected by the detection data is precisely the same as each detection position of the screw portion 13. It corresponds.

  The detection data generated in this way is transmitted to a processing unit (not shown) via the signal line 37.

  In the first embodiment, since the measurement unit 30 is configured to be movable along the axis of the base unit 22 and the axis L of the screw unit 13, the measurement unit 30 emits measurement light and the detection unit 35 emits measurement light. By continuously moving the measuring unit 30 over the entire length of the screw portion 13 while receiving light, it is possible to detect a large number of detection positions, whereby the entire length along the axis L of the outer edge of the screw portion 13 can be detected. The shape can be detected continuously.

  Thereafter, another detection position shifted by a half rotation in the circumferential direction with respect to each detected detection position, that is, a detection position on the opposite side across the axis L of the screw portion 13 is similarly detected. At this time, when only a part of the detection positions is detected in the previous detection, a position shifted by a half rotation in the circumferential direction and shifted by n + 0.5 (n is an integer) along the axis L is detected. . Here, the reason why the position is shifted by n + 0.5 pitch is that the detection position having the same shape as the detection position detected earlier by the continuous spiral shape is arranged.

  If the band width of the measurement light in the shape of a band of the measurement light is wider than the maximum width of the screw portion 13, detection of one detection position and detection of a detection position shifted by a half rotation can be performed simultaneously. It is.

  Then, along with or after detection of each detection position, the processing unit executes data processing based on each detection data. Here, based on the detection data and the position data of the axis L of the screw portion 13, the vertical distance between each detection position and the axis L of the screw portion 13 is calculated, and the radius of each position of the spiral shape of the screw portion is calculated. For example, the radius of the top of the screw thread 15, the radius of the bottom of the screw groove 16, the radius of the inclined surface of the screw groove 16 at the same pitch, and the like are obtained. Furthermore, in this embodiment, the diameter of each part is also obtained based on these radii.

  Here, the position data of the axis L may be set in the processing unit in advance based on the axis of the chuck unit 25 and the measuring device 20, and in this case, the measuring unit 30 determines each position with reference to the axis L. Since it is detected, data processing becomes easy. Further, before the detection of each detection position, the male screw 10 is supported by the chuck portion 25, and then the center line is obtained by the measuring unit 30 based on the entire length of the screw portion 13 or the projected images at both ends, and the screw portion 13 is obtained. It is also possible to set it as the position data of the axis L. In that case, when the male screw 10 is supported by the support portion 21, the radius can be accurately measured even if there is a slight deviation between the axis L and the axis of the measuring device.

  Then, using the position data of the axis L of the screw portion 13 as described above, the vertical distance is calculated by adding or subtracting the position data and each detection data, and the radius is obtained. Since this radius is a value that can be obtained immediately by measuring only one point of the detection position of the screw portion 13, it can be easily measured without being affected by the lead of the screw portion 13 at all.

  Specifically, for example, in order to obtain the radius of the top of the screw thread 15, the detection data of the top P1 as the first detection position and the apex P1 of the axis L of the screw 13 are obtained as shown in FIG. The vertical distance rm1 can be obtained as the radius by adding / subtracting the position data of the perpendicular intersection P2.

  Further, in order to obtain the diameter of the top portion of the screw thread 15, the detection data of the top portion P3 as the second detection position that is shifted from the top portion P1 by a half rotation in the circumferential direction and shifted by 0.5 pitch in the axis L direction, and the screw The vertical distance rm2 can be obtained as the radius rm2 of the vertex P3 by adding and subtracting the position data of the intersection point P4 of the perpendicular from the vertex P3 of the axis L of the part 13. Then, by adding the radius rm1 of the vertex P1 and the radius rm2 of the vertex P2, the diameter of the top portion of the screw thread 15 can be obtained.

  Further, in order to obtain the radius of the bottom of the screw groove 16, the detection data of the bottom P5 as the first detection position and the position data of the intersection P6 of the perpendicular from the bottom P5 of the axis L of the screw part 13 are added / subtracted. For example, the vertical distance rv1 can be obtained as the radius.

  Further, in order to obtain the diameter of the bottom portion of the screw groove 16, the detection data of the bottom portion P7 as the second detection position shifted from the bottom portion P5 by a half rotation in the circumferential direction and shifted by 0.5 pitch in the axis L direction, and the screw The vertical distance rv2 can be obtained as the radius rv2 of the bottom portion P7 by adding and subtracting the position data of the intersection point P8 of the perpendicular from the bottom portion P7 of the axis L of the portion 13. Then, the diameter of the bottom portion of the screw groove 16 can be obtained by adding the radius rv1 of the bottom portion P5 and the radius rv2 of the bottom portion P7.

  When measuring the diameter of the screw thread 15 or the screw groove 16, the position is shifted by a half rotation in the circumferential direction and is n + 0.5 (n is 1) along the axis L of the screw portion 13 in the axial direction. It is also possible to obtain by combining the radii of arbitrary two points which are shifted (an integer above), and further at a position shifted by an arbitrary rotation angle in the circumferential direction and shifted by a pitch corresponding to the rotation angle in the axial direction. It is possible to obtain by combining radii of arbitrary two points. However, in this embodiment, by adding the radii of the detection positions closest to each other to obtain the diameter, it is possible to easily measure an error that varies depending on the axial position of the screw portion 13.

  Then, the measurement of the radius and the diameter is completed by executing the same processing for all the screw threads 15 and the screw grooves 16 obtained by the projection image over the entire length along the axis L of the screw portion 13 in this way. To do.

  The results obtained by these measurements can be displayed as numerical values and figures on a monitor (not shown). Further, it can be stored as a record of each male screw 10 or used for control of other devices.

  Instead of obtaining the radii from the vertical distance from the axis L of the detection position such as the top of the plurality of screw threads 15 or the bottom of the screw groove 16, the radius is calculated by averaging the plurality of vertical distances. You may ask for it.

  According to the measuring apparatus 20 as described above, the detection position of the screw portion 13 is detected by the outer edge of the projection image having the maximum cross-sectional shape along the axis L of the screw portion 13 obtained by the measurement light, and this detection position and the screw portion 13 are detected. Therefore, the radius of the spiral shape can be measured in a non-contact state with the screw portion 13. Moreover, since the radius is measured, the radius can be obtained by detecting only one point at each detection position without being affected by the lead existing in the screw portion 13, and the screw portion 13 can be obtained with a simple configuration. It is possible to measure the spiral shape in a short time.

  Further, the first radius of the first detection position of the outer edge and the second radius of the second detection position shifted from the first detection position by a half rotation and shifted by n + 0.5 (n is an integer). Therefore, the irradiation unit 31 and the detection unit 35 can measure the first detection position and the second detection position from the same direction, and the helical shape of the screw part 13 without rotating the screw part 13. Can be measured. In addition, the first radius and the second radius are added to obtain the helical diameter of the screw portion 13, so that the screw portion 13 can be simply configured without being influenced by the lead existing in the screw portion 13. The diameter of the spiral shape can be measured.

  Further, since the first detection position and the second detection position are the top of the screw thread 15 of the screw part 13 or the bottom of the screw groove 16 of the screw part 13, the first detection position and the second detection point 35 are detected in the detection part 35. It is easy to clearly identify the detection position, and to measure accurately.

  Further, when the radius or diameter is obtained by averaging the vertical distances of a plurality of detection positions, the measurement result can be stabilized and easily compared.

  The above embodiment can be appropriately changed within the scope of the present invention. For example, in the above description, the support portion 21 has been described in which the male screw 10 is fixed and supported. However, the support portion 21 is not particularly limited, and the support portion 21 is configured to be rotatable about the axis L of the screw portion 13. It may be what was done. In that case, after measuring the radius of the outer edge at an arbitrary detection position, the arbitrary rotation amount is rotated, and the measurement unit 30 is moved along the axis L of the screw portion 13 by a multiple of the pitch corresponding to the rotation amount. It is also possible to detect the radius of each of the predetermined moved portions of the outer edge of the screw portion 13. In this way, the diameter of the outer edge of the screw portion 13 can be measured at a finer position.

Further, in this case, if the position rotated by 180 ° and shifted by (n + 0.5) is measured, the light of the measurement light emitted from the irradiation unit 31 is smaller than the maximum width of the screw unit 13. Even so, in order to measure the outer edge formed at a position symmetrical to the axis L of the screw portion 13, it is not necessary to move the measuring unit 30 in the direction orthogonal to the axis L, and the configuration of the apparatus can be simplified. Is possible.
[Embodiment 2]

  FIG. 3 shows the second embodiment. The second embodiment is an example of a male screw acceptance / rejection determination device using the measurement device of the first embodiment.

  This male screw acceptance / rejection determination device stores control data for controlling the operation of the measuring device 20 according to the first embodiment, and determination data including standard dimensions and allowable errors of the screw portions 13 of the various male screws 10. Storage unit 45 is provided, and after the diameter or radius of each detection position of the spiral shape is obtained in the data processing unit 43 of the measurement apparatus 20, whether or not the diameter or radius conforms to the standard is determined. The data processing unit 43 can make a determination.

  A monitor 47 for displaying the radius or diameter of each helical detection position of the screw portion 13 obtained by the data processing unit 43 is provided. Here, the diameter or radius of each measurement result is displayed together with the projection image of the maximum orthogonal cross section along the axis L of the screw portion 13.

  Next, the operation of the male screw acceptance / rejection determination device will be described.

  First, the male screw 10 is supported on the support portion 21 of the measuring device 20 and the axis L is accurately mounted along the axis of the base portion 22 and the determination process is started. At this time, the position of the axis L of the screw portion 13 is accurately set in the data processing unit 43.

  The setting of the axis L can be manually input, or the male screw 10 may be supported by the support unit 21 with the measuring device 20 in which the position of the axis L is specified in advance. Further, the position of the axis L is obtained from the position of the outer edge of the screw portion 13 by measuring the entire length of the screw portion 13 and the projected images of both ends by the signal from the drive control unit 41. Also good.

  In the determination process, first, the vertical distance between the outer edge of the screw portion 13 and the axis L is measured by the measurement unit 30 by the signal from the drive control unit 41 as in the first embodiment, and the detected data is processed by data processing. Is transmitted to the unit 43.

  Next, the data processing unit 43 calculates the diameter or radius based on the detection data.

  Thereafter, in the determination unit provided in the data processing unit 43, the determination data stored in the storage unit 45 is read, and the obtained diameter or radius is compared with the determination data. It is determined whether it is within. If the diameter or radius is within the allowable error range, it is determined to be acceptable. At this time, the determination data is selected from a plurality of types of determination data according to the diameter and type of the male screw 10 and used. The selection of the determination data may be performed manually in advance, and can be automatically selected and used as long as it can be automatically selected based on the measurement result of the measurement unit 30.

  Then, the determination result is transmitted to the monitor 47 and displayed together with the radius and diameter values. Based on this determination result, the determination process can be completed by recognizing the pass / fail of the measured male screw 10 and manually selecting the male screw 10 into a pass product and a reject product, for example.

  In order to perform pass / fail judgment with higher accuracy, the radius or diameter of a large number of screw portions 13, more preferably all screw threads 15, screw grooves 16, and inclined surfaces of screw grooves 16 are measured, and all values are specified. It is particularly preferable to determine whether it is within the range or outside the range.

  According to the determination device for the male screw 10 as described above, the spiral shape radius or diameter of the screw portion 10 is calculated using the measurement device 20 of the male screw 10 as in the first embodiment. The spiral shape of the screw part 13 can be measured in a short time, and the measurement result is compared with the determination data stored in the storage unit 45 in the determination unit provided in the data processing unit 43 to determine pass / fail. Therefore, it is possible to automatically perform from the measurement of the spiral shape of the screw portion 13 to the pass / fail determination of whether or not the screw portion 13 is within the standard range.

  In particular, when the pass / fail determination of the male screw 10 is performed using the radius of each detection position, the radius is immediately obtained by measuring only one point of the detection position of the screw portion 13, and the pass / fail determination can be performed. . Therefore, even if there is a lead in the screw portion 13, it is possible to perform the determination very quickly and easily without being affected by the lead at all.

Further, even when the pass / fail determination of the male screw 10 is performed using the diameter of each detection position, since the diameter is obtained after obtaining the radius of the detection position, the radius is obtained at one detection position, If one point at another detection position is measured, the diameter can be obtained immediately by obtaining the radius of this position and adding it to the previously obtained radius. Therefore, even if there is a lead in the screw portion 13, it is possible to make a determination very quickly and easily without being affected by the lead.
[Embodiment 3]

  FIG. 4 shows the third embodiment. The third embodiment is an example in which the determination device for the male screw 10 as in the second embodiment is provided in the male screw conveyance line.

  In the determination device for the male screw 10, for example, the male screw 10 that has been transported in the primary-side transport unit 51, for example, after the screw manufacturing step, is automatically supported by the support unit 21 of the measuring device 20 by a signal from the drive control unit 41. The diameter or radius of the spiral shape of the screw portion 13 is measured in the same manner as in the first embodiment, and after the pass / fail judgment is made in comparison with the judgment data and the allowable error in the same manner as in the second embodiment, the secondary side conveyance is performed. It is carried out to the part 53, and the acceptable product is accommodated in the acceptable product stocker 55, and the rejected product is accommodated in the rejected product stocker 57.

  According to such a determination device for the male screw 10, the loading, fixing, measurement, determination, and unloading of the male screw 10 can be performed automatically, and can be provided in the conveying line of the male screw 10, so that a large number of male screws 10 can be provided. It is easy to determine the screw portion 13 of the screw 10, and it is possible to inspect all the male screws 10.

It is a top view of the principal part of the measuring apparatus of the external thread of Embodiment 1 of this invention. It is a front view which shows the male screw of the measuring object of the measuring device of the male screw of Embodiment 1 of this invention. It is a block diagram which shows the pass / fail determination apparatus of Embodiment 2 of this invention. It is a block diagram which shows the pass / fail determination apparatus of Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Male screw 13 Screw part 15 Screw thread 16 Screw groove 20 Measuring apparatus 21 Support part 30 Measuring part 31 Irradiation part 35 Detection part 41 Drive control part 43 Data processing part 45 Storage part

Claims (5)

In the male screw measuring device for measuring the shape of the screw portion by projection light obtained by irradiating the screw portion of the male screw with measurement light,
A support portion for supporting the male screw in a state in which the screw portion is protruded;
An irradiation unit capable of irradiating the measurement light from one side of the screw unit;
A detection unit for detecting a detection position of the screw part corresponding to the outer edge by an outer edge of a projection image having a maximum cross-sectional shape along the axis of the screw part obtained by the measurement light;
An apparatus for measuring a male screw, comprising: a processing unit that obtains a spiral radius of the screw part by calculating a vertical distance between the detection position and the axis of the screw part.   The processing unit is configured to shift a first radius of the first detection position of the outer edge from the first detection position by a half rotation and a second detection position shifted by n + 0.5 (n is an integer) pitch. 2. The male screw measurement according to claim 1, wherein the second radius of the screw portion is obtained, and the first radius and the second radius are added to obtain a helical shape diameter of the screw portion. apparatus.   The male screw measuring device according to claim 2, wherein the first detection position and the second detection position are a top of a screw thread and / or a bottom of a screw groove of the screw part.   4. The male screw measuring device according to claim 1, wherein the processing unit obtains an average of the radius or diameter by averaging the vertical distances of the plurality of detection positions. 5. The male screw part measuring device according to any one of claims 1 to 4, comprising:
An apparatus for determining a male screw, comprising: a determination unit that compares determination data stored in a storage unit with a radius or a diameter of the spiral shape to determine pass / fail.

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