Inspection device and inspection method

Abstract

To accurately measure the positional accuracy of the workpiece. [Solution] The workpiece is provided with a first machining hole extending in the axial direction and a second machining hole extending in the radial direction. The inspection device includes a first insertion gauge inserted into the first machining hole and a second insertion gauge inserted into the second machining hole. The first insertion gauge has a through hole that penetrates in the direction of the opening of the second machining hole at a position that overlaps with the second machining hole when viewed from the radial direction of the central axis when the first insertion gauge is inserted into the first machining hole for a specified length. The second insertion gauge has an insertion portion with an outer diameter that matches the inner diameter of the second machining hole and a gauge portion that penetrates the through hole and can contact the inner circumference of the first machining hole. The through hole has a portion with an inner diameter that matches the outer diameter of the contact portion, and the outer circumference of the insertion portion is provided with a mark that allows the insertion length of the gauge portion into the second machining hole to be visually confirmed.

Description

Technical Field

[0001] The present invention relates to an inspection apparatus and an inspection method.

Background Art

[0002] Patent Document 1 discloses an inspection apparatus for inspecting the positional accuracy (positional tolerance) of holes formed in a workpiece.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] This Patent Document 1 discloses a technique for easily inspecting the positional accuracy of holes machined in a workpiece without using a three - dimensional measuring instrument, by means of a plug gauge.

Problems to be Solved by the Invention

[0005] This technique can satisfactorily measure the positional accuracy of holes machined in the same direction at a portion protruding in a flange shape from the outer periphery of the inspection object. For example, in a shaft of a transmission, there are oil holes machined in the axial direction and oil holes communicating with the oil holes from the radial direction. In the case of a workpiece having such intersecting oil holes, it may not be possible to appropriately measure the positional accuracy of the oil holes. Therefore, it is required to be able to appropriately measure the positional accuracy of the machined holes in a workpiece having intersecting oil holes (machined holes).

Means for Solving the Problems

[0006] One aspect of the present invention is an inspection apparatus used for inspecting the positional accuracy of machined holes provided in a workpiece, wherein in the workpiece, A first machining hole extends through the interior of the workpiece along a central axis that is aligned with the longitudinal direction of the workpiece, and opens at least one of the two ends of the workpiece in the longitudinal direction, The workpiece is provided with a second machining hole that extends radially in the direction of the central axis and connects the first machining hole with the outer circumference of the workpiece. The inspection device, A first insertion gauge inserted into the aforementioned machined hole, The device comprises a second insertion gauge inserted into the second machining hole, The first insertion gauge is provided with a through hole that penetrates the opening direction of the second machining hole at a position that overlaps with the second machining hole when viewed from the radial direction of the central axis when the first insertion gauge is inserted into the first machining hole for a specified length. The second insertion gauge is, An insertion portion having an outer diameter that matches the inner diameter of the second machined hole, The gauge portion has a contact portion that has a smaller outer diameter than the insertion portion and is able to penetrate the through hole and contact the inner circumference of the first machining hole, and these contact portions are connected in series on the same axis. The through hole is formed with an inner diameter that matches the outer diameter of the contact portion. The inspection device is configured such that the outer circumference of the insertion portion is provided with a mark that allows the insertion length of the gauge portion into the second machined hole to be visually confirmed. [Effects of the Invention]

[0007] According to one aspect of the present invention, the positional accuracy of a machined hole can be appropriately measured. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a diagram illustrating the inspection process using an inspection device. [Figure 2] Figure 2 is a diagram illustrating the workpiece. [Figure 3] Figure 3 is a diagram illustrating the workpiece. [Figure 4] Figure 4 is a diagram illustrating the workpiece. [Figure 5] FIG. 5 is a diagram for explaining the inspection apparatus. [Figure 6] FIG. 6 is a diagram for explaining the inspection apparatus. [Figure 7] FIG. 7 is a diagram for explaining the inspection apparatus. [Figure 8] FIG. 8 is a diagram for explaining the inspection apparatus. [Figure 9] FIG. 9 is a diagram for explaining the inspection apparatus. [Figure 10] FIG. 10 is a diagram for explaining the inspection apparatus. [Figure 11] FIG. 11 is a diagram for explaining the inspection apparatus. [Figure 12] FIG. 12 is a diagram for explaining the inspection apparatus. [Figure 13] FIG. 13 is a diagram for explaining the inspection apparatus. [Figure 14] FIG. 14 is a diagram for explaining the inspection apparatus. [Figure 15] FIG. 15 is a diagram for explaining the inspection apparatus. [Figure 16] FIG. 16 is a diagram for explaining the gauge holder and the first insertion gauge. [Figure 17] FIG. 17 is a diagram for explaining the gauge holder. [Figure 18] FIG. 18 is a diagram for explaining the first insertion gauge. [Figure 19] FIG. 19 is a diagram for explaining the second insertion gauge. [Figure 20] FIG. 20 is a diagram for explaining the positional relationship between the through hole of the first insertion gauge inserted into the first processing hole of the workpiece and the second processing hole. [Figure 21] FIG. 二十一 is a diagram for explaining the operation of the second insertion gauge. [Figure 22] FIG. 二十二 is a diagram for explaining the operation of the second insertion gauge. [Figure 23] FIG. 二十三 is a diagram for explaining the operation of the second insertion gauge. [Figure 24] FIG. 24 is a diagram for explaining the role of the turntable.

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described using the example of an inspection device 1 used for inspecting the positional accuracy of a machined hole provided in a workpiece 9. Figure 1 is a diagram illustrating the inspection process by the inspection device 1. In Figure 1(a), the inspection device 1 is schematically shown in cross-section with the workpiece 9 before the workpiece 9 is set. In Figure 1(b), the inspection device 1 is schematically shown in cross-section with the workpiece 9 set. In Figure 1(c), the state in which the first insertion gauge 7 of the inspection device 1 is inserted into the first machined hole 91 of the workpiece 9 is schematically shown in cross-section. In Figure 1(d), the state in which the second insertion gauge 8 of the inspection device 1 is inserted into the second machined hole 92 of the workpiece 9 is schematically shown in cross-section.

[0010] Figures 2 to 4 illustrate workpiece 9. Figure 2 schematically shows a cross-section of workpiece 9 cut along line AA in Figure 1(a). Figure 3(a) schematically shows a cross-section of workpiece 9 cut along line BB in Figure 1(c). Figure 3(b) schematically shows a cross-section of workpiece 9 cut along line CC in Figure 1(c). Figure 3(c) schematically shows a cross-section of workpiece 9 cut along line DD in Figure 1(d). Figure 4(a) schematically shows a cross-section of workpiece 9 cut along line ACB in Figure 2. Figure 4(b) schematically shows a cross-section of workpiece 9 cut along line ACD in Figure 2.

[0011] In the following explanation, when describing the components of the inspection device 1, the positional relationships of each component may be described using the symbols "X", "Y", and "Z", as well as the terms "upper side" and "lower side", and "front side" and "rear side" in Figure 1. The X direction corresponds to the width direction (front-to-back direction in Figure 1) when the inspection device 1 is viewed from the front. The Y direction corresponds to the depth direction (left-to-right direction in Figure 1) when the inspection device 1 is viewed from the front. The Z direction corresponds to the vertical direction (up-down direction in Figure 1) when the inspection device 1 is installed on the installation surface Fr. The upper side refers to the upper side in the Z direction (vertical direction) in Figure 1, and the lower side refers to the lower side in the Z direction in Figure 1. The front side refers to one side in the Y direction (horizontal direction) in Figure 2, and the rear side refers to the other side in the Y direction in Figure 2.

[0012] As shown in Figure 1, the inspection device 1 is used by being placed on the mounting surface Fr. In the inspection device 1, the workpiece 9 is set from the front of the inspection device 1, and the positional accuracy of the machined holes in the workpiece 9 is inspected using the first insertion gauge 7 and the second insertion gauge 8.

[0013] As shown in Figure 1(a), the workpiece 9, which is the object to be inspected by the inspection device 1, has a first machining hole 91 extending in the axial direction and a second machining hole 92 extending in the radial direction inside the cylindrical base 90 (see Figure 1(b)). The inspection device 1 is used to inspect whether the first machined hole 91 and the second machined hole 92 machined in the workpiece 9 have been properly machined.

[0014] An example of an object to be inspected by inspection device 1 is the shaft of a transmission. As shown in Figure 4, the workpiece 9 in the case of a transmission shaft is a rod-shaped member having multiple first machined holes 91 (91A, 91B, 91C) machined in the axial direction (direction of the central axis C) and multiple second machined holes 92 (92A, 92B, 92C, 92D) that communicate with the first machined holes 91 (91A, 91B, 91C) from the radial direction (radial direction of the central axis C). In the following explanation, the first machining holes 91A, 91B, and 91C and the second machining holes 92A, 92B, 92C, and 92D may be simply referred to as the first machining hole 91 and the second machining hole 92, respectively, unless otherwise specified.

[0015] As shown in Figure 2, the workpiece 9 has three first machining holes 91 (91A, 91B, 91C) inside the cylindrical base 90. In the base portion 90, the first machining holes 91 (91A, 91B, 91C) are provided at 120° intervals in the circumferential direction around the central axis C of the base portion 90. The center C91 of each first machining hole 91 (91A, 91B, 91C) is located on a virtual circle Im1 centered on the central axis C.

[0016] As shown in Figure 4, the three first machined holes 91 (91A, 91B, 91C) are blind holes opening at one end 9a of the base 90. The first machined holes 91 (91A, 91B, 91C) have different lengths La, Lb, and Lc in the direction of the central axis C of the workpiece 9 (La > Lb > Lc). The tip 91a side of the first machined hole 91 (91A, 91B, 91C) is connected to the second machined hole 92 (92A, 92B, 92C), which extends radially along the central axis C. The second machining holes 92 (92A, 92B, 92C) are located at a position offset by a predetermined length Lz from the tip 91a of the first machining hole 91 (91A, 91B, 91C). The second machining hole 92D is located at a position significantly separated from the second machining hole 92C, on one end 9a side (upper side in the figure) of the base 90.

[0017] As shown in Figure 3(a), the second machining hole 92A is provided in a direction along the diameter line L90A of the base 90. The second machining hole 92A connects the outer circumference of the workpiece 9 (base 90) with the first machining hole 91A. As shown in Figures 3(b) and 3(c), the other second machining holes 92B and 92C are also provided in a direction along the diameter lines L90B and L90C. The second machining holes 92B and 92C also connect the outer circumference of the workpiece 9 (base 90) with the first machining holes 91B and 91C. The second machining holes 92 (92A, 92B, 92C) open in different directions in the circumferential direction around the central axis C of the workpiece 9. As shown in Figure 4, the second machining holes 92 (92A, 92B, 92C) in the base 90 are located at different positions in the axial direction of the central axis C. Furthermore, the second machining hole 92D opens in the same direction as the second machining hole 92C.

[0018] A larger diameter portion 96, with a larger outer diameter than the base portion 90, is provided at the other end 9b of the base portion 90. The larger diameter portion 96 is provided around the entire circumference in the circumferential direction about the central axis C. Teeth (not shown) are provided on the outer circumference of the larger diameter portion 96. A concave contact groove 95 is provided on one end 9a (upper side in the figure) when viewed from the large diameter portion 96. The contact groove 95 is provided around the entire circumference in the circumferential direction around the central axis C.

[0019] Figures 5 to 7 illustrate the inspection device 1. Figure 5 schematically shows the inspection device 1 as viewed from the front. Figure 6 schematically shows a cross-section of the inspection device 1 cut along line AA in Figure 5. Figure 7 schematically shows a cross-section of the inspection device 1 cut along line AA in Figure 6.

[0020] In the inspection device 1, the following steps are performed in order: (a) a preparation step in which the inspection device 1 supports the workpiece 9 in an orientation along the Z direction (see Figure 1(b)); (b) a first insertion step in which the first insertion gauge 7 is inserted into the first machined hole 91 of the workpiece 9 from the Z direction (see Figure 1(c)); and (c) a second insertion step in which the second insertion gauge 8 is inserted into the second machined hole 92 of the workpiece 9 from the radial direction (see Figure 1(d)). Then, during the second insertion process, by checking which of the multiple markers MK1 to Mk3 provided on the second insertion gauge 8 is located outside the workpiece 9 (confirmation process), it is confirmed whether the two intersecting machined holes (first machined hole 91, second machined hole 92) have been machined properly.

[0021] The configuration of inspection device 1 will be described in detail below. As shown in Figure 5, the inspection device 1 has a base portion 20 that is placed on the mounting surface Fr. As shown in Figure 7, the base portion 20 has a roughly rectangular shape when viewed from the Z direction. A turntable 21 is installed in the center of the base portion 20. As shown in Figure 6, the turntable 21 has a fixed part 211 fixed to the base part 20, a movable part 212 rotatably supported by the fixed part 211, and a mounting part 213 fixed to the upper part of the movable part 212. The mounting part 213, the movable part 212, and the fixed part 211 are arranged concentrically on the central axis Z1. The central axis Z1 is a reference axis that passes through the rotation axes of the movable part 212 and the mounting part 213 and extends in the Z direction. The mounting part 213 and the movable part 212 are rotatable around the central axis Z1.

[0022] As shown in Figure 7, the mounting portion 213 is circular in shape when viewed from above. On the outer circumference 213a of the mounting portion 213, gripping handles 214 are provided at 90° intervals in the circumferential direction around the central axis Z1 of the mounting portion 213.

[0023] In the mounting section 213, support columns 3 are provided at positions that intersect with the central axis Z1. The support columns 3 extend linearly in the Z direction along the central axis Z1. The support columns 3 are positioned so that the central axis Z1 is located not in the center in the thickness direction (left-right direction in Figure 7), but closer to one of the surfaces 3c in the thickness direction (Y direction). A groove 301 is provided on one surface 3c in the thickness direction of the base 30 of the support column 3. A guide rail 31 is fitted into and fixed to the groove 301 from the Y direction.

[0024] As shown in Figure 6, an intermediate holder 33 is provided on the support column 3 at a position approximately midway along the Z direction. The groove 301 is provided in the range from the upper end 3a of the support column 3 to the intermediate holder 33.

[0025] As shown in Figure 7, the slider 4 is provided with connecting arms 401, 401 for the guide rail 31 at the base end 40b on one side (right side in the figure) of the plate-shaped base 40 in the Y direction. The slider 4 is mounted so as to be movable in the Z direction, with its detachment from the guide rail 31 restricted by the engagement of the connecting arms 401, 401 on both sides of the guide rail 31 in the X direction. At the base 40 of the slider 4, a support hole 410 for the gauge holder 6, which will be described later, is provided at a position away from the base end 40b towards the tip 40a side (left side in the figure). The support hole 410 penetrates the base 40 in the thickness direction (Z direction) (see Figure 8).

[0026] Figures 8 to 10 illustrate the inspection device 1. In Figure 8, the area on the upper end 3a side of the support column 3 in Figure 6 is schematically shown in an enlarged view. In Figure 9, the area on the upper end 3a side of the support column 3 in Figure 5 is schematically shown in an enlarged view. In Figure 10, the cross-section along line AA in Figure 6 is schematically shown.

[0027] As shown in Figures 8 and 9, a pulley holder 32 is fixed to the upper end 3a of the support column 3. As shown in Figure 9, the pulley holder 32 has a base portion 321 fixed to the upper end 3a of the support column 3, and a support portion 322 extending upward from approximately the center of the base portion 321 in the width direction (X direction). Viewed from the Y direction, the base portion 321 is a plate-shaped part positioned perpendicular to the central axis Z1. Viewed from the Y direction, the support portion 322 extends upward along the central axis Z1 at a position offset from the central axis Z1 in the X direction (left direction in Figure 9). A pulley 323 is positioned on the central axis Z1 side (right side in Figure 9) of the support portion 322. Viewed from the X direction, the pulley 323 is positioned at a location that intersects the central axis Z1.

[0028] As shown in Figure 8, a pair of pulleys 323, 323 are provided on the support portion 322 when viewed from the X direction. The pair of pulleys 323, 323 on the support portion 322 are spaced apart in the Y direction. When viewed from the X direction, the pulleys 323, 323 are located on one side (left in the figure) and the other side (right in the figure) of the support column 3 in the Y direction, respectively. When viewed from the X direction, the pulleys 323, 323 are aligned in the Z direction. The pulleys 323 are rotatable around pivot axes Y323, Y323 along the Y direction.

[0029] Viewed from the X direction, one end 321a of the base 321 is provided crossing the front pulley 323 in the Y direction (left direction in the figure). The other end 321b of the base 321 is provided flush with the rear surface 3d of the support column 3. A wire guide 324 is provided on one end 321a of the base portion 321. The wire guide 324 has a wire insertion hole 324a that penetrates in the Z direction. A wire insertion hole 321c is also provided in the base portion 321 at a position corresponding to the insertion hole 324a, and it penetrates in the Z direction.

[0030] One end of wire W passes through the insertion holes 324a and 321c in the Z direction. One end of wire W is secured to the upper surface of slider 4 below the base 321. The portion of wire W that is pulled upward from wire guide 324 is wrapped around a pair of pulleys 323, 323. The other end of wire W is pulled downward in the Z direction along support column 3 and then secured to weight Wt (see Figure 6). Slider 4 and weight Wt are connected via pulleys 323 and wire W wrapped around 323. Slider 4 and weight Wt are relative to each other in the Z direction. In support column 3, when slider 4, located at the front in the Y direction, moves upward in the Z direction, weight Wt, located at the rear, moves downward in the Z direction. When slider 4 moves downward in the Z direction, weight Wt moves upward in the Z direction.

[0031] As shown in Figure 5, the support column 3 is provided with a pair of ball plungers 10 at the top and bottom of the area where the guide rail 31 is installed. The ball plungers 10 are provided for positioning the slider 4 which moves in the Z direction along the guide rail 31.

[0032] As shown in Figure 7, holders 35, 35 that support the ball plunger 10 are provided at the top of the support column 3. The holders 35, 35 are fixed to both sides of the support column 3 (base 30) in the X direction with bolts (not shown). The holder 35 has a fixing portion 351 that is fixed to the side surface of the support column 3 (base portion 30), and an extension portion 352 that extends in the Y direction from the fixing portion. When viewed from the Z direction, the extension portions 352, 352 extend on both sides of the area where the slider 4 (base portion 40) supported by the guide rail 31 is located, in a direction away from the base portion 30 (to the left in the figure). The tips 35a, 35a of the extensions 352, 352 extend to the sides of the region where the support hole 410 of the slider 4 is provided. The extensions 352, 352 are provided in a symmetrical positional relationship with respect to the region where the slider 4 (base 40) is located. Through holes 353, 353 are provided on the tip 35a side of the extensions 352, penetrating in the X direction. The ball plunger 10 is screwed into the through holes 353, 353 from the outside in the X direction. The ball Ba of the ball plunger 10 is designed to resiliently engage with the grooves 402a provided on both sides of the slider 4 when the slider 4 reaches the same height position as the holders 35, 35 in the Z direction. The slider 4 is positioned in the Z direction when the ball Ba of the ball plunger 10 engages with the grooves 402a provided on both sides in the X direction.

[0033] As shown in Figure 10, the holders 36, 36 are also fixed to both sides of the support column 3 (base 30) in the X direction with bolts (not shown). The holder 36 has a fixing portion 361 fixed to the side of the base portion 30 and an extension portion 362 extending in the Y direction from the fixing portion. When viewed from the Z direction, the extension portions 362, 362 extend away from the base portion 30 on both sides of the slider 4 (base portion 40) supported by the guide rail 31. Through holes 363, 363 are provided at the tip 362a side of the extension portion 362, penetrating in the X direction. A ball plunger 10 is screwed into the through holes 363, 363 from the outside in the X direction. The ball Ba of the ball plunger 10 is designed to resiliently engage with grooves 402a provided on both sides of the slider 4 when the slider 4 reaches the same height position as the holders 36, 36 in the Z direction. In this embodiment, when the first insertion gauge 7, described later, is inserted to a predetermined length into the first machining hole 91 on the workpiece 9 side, the ball Ba of the ball plunger 10 engages with the groove 402a on the slider 4 side, thereby positioning the slider 4 (first insertion gauge 7) at a predetermined position for inspecting positional accuracy.

[0034] As shown in Figure 5, connecting cylinders 49, 49 are provided on one side (right side in the figure) of the slider 4 in the X direction. The connecting cylinders 49, 49 are arranged vertically in the Z direction. The support frame 391 of the operating handle 39 is fixed to the tip of the connecting cylinders 49, 49 by bolts B, B. The support frame 391 is oriented along the central axis Z1. The support frame 391 extends downward toward the base portion 20 along the central axis Z1. The operating handle 39 is fixed to the lower end region of the support frame 391. The operating handle 39 is oriented along the X direction and extends away from the support column 3. In the inspection device 1, when an operator grips the operating handle 39 and moves the operating handle 39 in the Z direction, the slider 4 moves along the guide rail 31 in the Z direction.

[0035] Figures 11 to 13 illustrate the inspection apparatus 1. Figure 11 shows a magnified and schematic representation of the area around the intermediate holder 33 in Figure 6. Figure 12 schematically shows a cross-section along line AA in Figure 11. Figure 13 schematically shows a cross-section along line BB in Figure 11. As shown in Figure 11, the intermediate holder 33 is a plate-shaped member provided in a direction perpendicular to the support column 3. The base end 33b of the intermediate holder 33 is fitted into a concave fitting portion 305 provided on the front surface 3c of the support column 3. The intermediate holder 33 extends linearly along the Y direction, away from the support column 3. A support hole 330 for the workpiece holder 34 is provided at the tip 33a side of the intermediate holder 33. The support hole 330 penetrates the base 331 of the intermediate holder 33 in the thickness direction (vertical direction in Figure 11). The support hole 330 is formed by connecting a small diameter portion 330a and a large diameter portion 330b, which has a larger inner diameter than the small diameter portion 330a, in series. In the Z direction, the small diameter portion 330a is located below the large diameter portion 330b. The small diameter portion 330a and the large diameter portion 330b are arranged concentrically.

[0036] The shaft portion 341 of the work holder 34 is inserted into the support hole 330 from below. A disc-shaped stopper 343 is fixed to the upper end of the shaft portion 341. A fitting portion 342 with a larger diameter than the shaft portion 341 is provided at the lower part of the shaft portion 341. At the lower end 342a of the fitting portion 342, A concave fitting recess 342b is open. One end 9a (upper end) of the workpiece 9 is fitted into and supported by the fitting recess 342b from the Z direction.

[0037] A spring Sp is externally fitted to the shaft portion 341. One end of the spring Sp abuts against the fitting portion 342 from the Z direction. The other end of the spring Sp abuts against the periphery of the support hole 330 in the intermediate holder 33. The work holder 34 is biased downward by the biasing force of the spring Sp. In this state, the stopper 343 of the work holder 34 is engaged at the boundary between the small diameter portion 330a and the large diameter portion 330b in the support hole 330, preventing the work holder 34 from falling out of the support hole 330. The work holder 34 is elastically displaceable in the Z direction and is configured to hold one end 9a of the workpiece 9 while biasing the workpiece 9 downwards.

[0038] As shown in Figure 13, when viewed from the Z direction, the work holder 34 is provided with insertion holes 345, 345, 345 for the first insertion gauge 7 at a position that overlaps with the first machining hole 91 of the workpiece 9. In this embodiment, when the slider 4 is positioned by the upper ball plungers 10, 10 in the inspection device 1, at least two of the first insertion gauges 7A, 7B of the first insertion gauges 7 (7A, 7B, 7C) are held in a position where the tip side with the gauge hole 71 is inserted into the insertion holes 345, 345.

[0039] As shown in Figure 12, the tip 33a of the intermediate holder 33 has a width W33a in the X direction that is narrower than the width W331 of the base 331 in the X direction. Between the tip 33a and the base 331, there is a narrowed width section 332 where the width in the X direction narrows as it moves away from the tip towards the base 331. The side surface 332a of the reduced width portion 332 is an inclined surface that is tilted with respect to the center line C33 of the base portion 331. Guide members 51, 51 having grooves 510 are fixed to the side surfaces 332a, 332a.

[0040] As shown in Figure 5, the guide members 51, 51 are provided in a direction along the central axis Z1. As shown in Figure 9, the upper ends 51a of the guide members 51, 51 are fixed to the base 40 of the slider 4. The groove 510 in the guide member 51 extends upward toward the slider 4 along the Z direction. As shown in Figure 13, the shaft portion N1 of the screw N is screwed into the fitting portion 342 of the work holder 34, through the groove 510 of the guide members 51, 51.

[0041] As described above, the work holder 34 is supported by an intermediate holder 33 fixed to the support column 3 (see Figure 11). Therefore, when the slider 4 to which the guide members 51, 51 are fixed moves in the Z direction along the guide rail 31, the screws N, N screwed into the fitting portion 342 move within the grooves 510, 510 of the guide members 51, 51. As a result, the movement of the guide members 51, 51 in the Z direction, which is accompanied by the movement of the slider 4 in the Z direction, is guided by the screws N that pass through the grooves 510 of the guide members 51.

[0042] As shown in Figure 5, the lower side of the intermediate holder 33 is provided with a restricting portion 37 for restricting the rotation of the workpiece 9 and a locking portion 38 for the workpiece 9. Figures 14 and 15 illustrate the inspection device 1. Figure 14 schematically shows a cross-section of the area where the regulating part 37 of the inspection device 1 is provided, cut along line BB in Figure 6. Figure 15 schematically shows a cross-section of the area where the locking part 38 of the inspection device 1 is provided, cut along line CC in Figure 6.

[0043] As shown in Figure 14, the restricting portion 37 has a fixing portion 371 that is fixed to the base portion 30 of the support column 3. The fixing portion 371 is fixed to the base portion 30 by a bolt B that passes through the fixing portion 371 in the Y direction. Adjacent to the fixing portion 371 in the X direction, a leg portion 372 is provided that extends in a direction perpendicular to the surface 3c on one side (left side in the figure) of the base portion 30. The leg portion 372 is bent toward the bolt B side (upper side in the figure) at a position away from the base portion 30. The region of the leg portion 372 beyond the bent portion 372a serves as the support portion 373 for the positioning screw 375. A screw hole 373a is provided in the support portion 373, penetrating in the thickness direction. The screw 375 is screwed into the screw hole 373a from the bolt B side (upper side in the figure). The tip 376 of the screw 375 protrudes beyond the screw hole 373a.

[0044] When setting the workpiece 9 into the inspection device 1, the tip 376 of the screw 375 presses against the contact groove 95 of the workpiece 9 from the radial direction of the central axis C of the workpiece 9, thereby restricting the rotation of the workpiece 9 around the central axis C. For example, in Figure 14, the tip 376 of the screw 375 is shown as being pressed against the contact groove 95 provided on the outer circumference of the workpiece 9, but the tip 376 of the screw 375 may also be inserted into the second machined hole 92D that opens on the outer circumference of the workpiece 9 to restrict the rotation of the workpiece 9 around the central axis C.

[0045] As shown in Figure 15, the locking portion 38 has a fixing portion 381 that is fixed to the base portion 30 of the support column 3. The base portion 30 is provided with a fitting groove 306 for the fixing portion 381. The fixing portion 381 is fixed to the base portion 30 by a bolt B that passes through the base portion 30 while fitted into the fitting groove 306 from the Y direction. The base portion 30 is fixed on both sides in the X direction with bolts B. Between the bolts B, B on the base portion 30, a support portion 382 is provided that extends in a direction perpendicular to one surface 3c of the base portion 30. The support portion 382 has a width W38 in the X direction. The tip 38a of the support portion 382 is located beyond the central axis C in the Y direction. A recess 383 is provided on the tip 38a side of the support portion 382, ​​recessed toward the fixing portion 381 side. The recess 383 has a width in the X direction that matches the outer diameter D90 of the base 90 of the workpiece 9. The recess 383 extends toward the fixing portion 381 side (right side in the figure) along the center line C38 of the support portion 382. The region 383a of the recess 383 toward the fixing portion 831 side (right side in the figure) of the central axis C has an arc shape that follows the outer circumference of the base 90 of the workpiece 9. In the support portion 382, ​​both sides of the recess 383 in the X direction are locking portions 384, 384 that engage with the large diameter portion 96 of the workpiece 9.

[0046] When setting the workpiece 9 in the inspection device 1, the workpiece 9 is supported by the support column 3 through the following procedure. (a) One end 9a of the base 90 of the workpiece 9 is fitted into the fitting portion 342 of the workpiece holder 34 from below in the Z direction, and then the workpiece 9 is lifted to compress the spring Sp in the direction of the central axis C (see Figure 11). (b) The area of ​​the base 90 of the workpiece 9 below the large diameter portion 96 (the other end 9b side) is inserted into the recess 383 of the locking portion 38 (see Figure 15) from the Y direction. (c) The biasing force of the spring Sp presses the large diameter portion 96 of the workpiece 9 against the peripheral edge of the recess 383 of the locking portion 38 (see Figure 15). (d) The screw 375 of the restricting portion 37 is screwed into the support portion 373, and the tip 376 of the screw 375 is pressed against the contact groove 95 of the workpiece 9 from the radial direction of the central axis C (see Figure 14).

[0047] As a result, the workpiece 9 is supported by the inspection device 1 with its large-diameter portion 96 pressed against the locking portion 38 by the biasing force of the spring Sp acting via the workpiece holder 34. In this state, the workpiece 9 is positioned such that its central axis C is aligned with the central axis Z1 of the inspection device 1 (see Figure 1(b)). Furthermore, the rotation of the workpiece 9 around its central axis C is restricted by the tip 376 of the screw 375, which is pressed against the contact groove 95 (see Figure 14). Alternatively, the tip 376 of the screw 375 may be inserted into a second machined hole 92D that opens on the outer circumference of the workpiece 9 to restrict the rotation of the workpiece 9 around its central axis C.

[0048] Figure 16 illustrates the gauge holder 6 and the first insertion gauges 7 (7A, 7B, 7C). Figure 17 illustrates the gauge holder 6. Figure 17 schematically shows a cross-section of the gauge holder 6 cut along line AA in Figure 16. Figure 18 illustrates the first insertion gauges. Figure 18(a) schematically shows a cross-section of the first insertion gauges 7 cut along line BB in Figure 16. Figure 18(b) schematically shows a cross-section of the first insertion gauges 7 cut along line CC in Figure 16.

[0049] In the inspection device 1, when inspecting the positional accuracy (machining precision) of the machined holes (first machined hole 91, second machined hole 92) of the workpiece 9, the first insertion gauges 7 (7A, 7B, 7C) are inserted from the Z direction into the first machined holes 91 (91A, 91B, 91C) of the workpiece 9, which is supported by the support column 3. As shown in Figure 16, the first insertion gauges 7 (7A, 7B, 7C) are supported on the slider 4 via a common gauge holder 6. The slider 4 is movably mounted in the Z direction on the aforementioned guide rail 31 (see Figures 1(a), (b), and (c)).

[0050] The gauge holder 6 has a gauge support portion 61 having a cylindrical shaft portion 611, and a plate portion 62 fixed to one end 611a of the shaft portion 611 with a bolt V. The gauge holder 6 has a flange portion 612 with a larger diameter than the shaft portion 611 at the end opposite to the end 611a. Viewed from the Z direction, the flange portion 612 is formed with an outer diameter larger than the outer diameter D611 of the shaft portion 611. The plate portion 62 is a disc-shaped member with an outer diameter that matches that of the flange portion 612. As shown in Figure 8, bearings B are provided between the plate portion 62 of the gauge holder 6 and the base portion 40 of the slider 4, and between the flange portion 612 of the gauge holder 6 and the base portion 40 of the slider 4. The gauge holder 6 is mounted so as to be rotatable relative to the slider 4, with its detachment from the slider 4 being restricted by the plate portion 62.

[0051] As shown in Figure 17, the gauge support portion 61 is provided with insertion holes 63 (63A, 63B, 63C) for the first insertion gauges 7 (7A, 7B, 7C). The insertion holes 63 (63A, 63B, 63C) are provided in three locations at 120° intervals in the circumferential direction around the central axis C of the gauge support portion 61. The insertion holes 63 (63A, 63B, 63C) open at the lower end 612b of the flange portion 612 (see Figure 16) and extend linearly along the central axis C inside the shaft portion 611. As shown in Figure 16, each of the insertion holes 63 (63A, 63B, 63C) has a length L63 in the Z direction. As shown in Figure 17, the flange portion 612 is provided with communication holes 613a, 613b, and 613c that communicate with the insertion holes 63 (63A, 63B, 63C) from the radial direction of the central axis C. As shown in Figure 17, the communication holes 613a, 613b, and 613c extend linearly in the radial direction of the central axis C. The communication holes 613a, 613b, and 613c connect the insertion holes 63 (63A, 63B, 63C) with the outer circumference 612a of the flange portion 612.

[0052] A first insertion gauge 7 (7A, 7B, 7C) is inserted into each of the insertion holes 63 (63A, 63B, 63C). As shown in Figure 16, the first insertion gauges 7 (7A, 7B, 7C) have a cylindrical base 70. A through hole 72 is provided at the base end of the base portion 70, penetrating the base portion 70 in the thickness direction. As shown in Figures 17 and 18, the region of the base portion 70 where the through hole 72 is provided has a width W72 that is smaller than the inner diameter D613 of the communication hole 613. Positioning pins 65 are inserted into the insertion holes 63 (63A, 63B, 63C). The positioning pins 65 have a head 650 and a shaft portion 651 extending from the head 650. The shaft portion 651 has a large diameter portion 652 and a small diameter portion 653. The large diameter portion 652 has an outer diameter that matches the inner diameter D613 of the aforementioned communication hole 613. The small diameter portion 653 has an outer diameter that matches the width W72 of the aforementioned through hole 72. The large diameter portion 652 and the small diameter portion 653 are arranged coaxially. When the positioning pin 65 is inserted into the communication hole 613 from the radial direction of the central axis C, the small diameter portion 653 engages with the through hole 72 on the first insertion gauge 7 side. As a result, the first insertion gauges 7 (7A, 7B, 7C) are supported by the gauge holder 6 in a state where they cannot fall out of the gauge holder 6 or rotate. Furthermore, since the first insertion gauges 7 (7A, 7B, 7C) are detachable from the gauge holder 6, if the first insertion gauges 7 (7A, 7B, 7C) become worn or damaged, they can be replaced with first insertion gauges 7 of a different length.

[0053] As shown in Figure 16, the first insertion gauges 7 (7A, 7B, 7C) have different lengths L7A, L7B, and L7C. A gauge hole 71 is provided at the tip end of the base 70. The gauge hole 71 penetrates the base 70 in a direction perpendicular to it. The gauge hole 71 is an elongated hole with a length L71 in the longitudinal direction of the base 70 (see Figure 18).

[0054] The first insertion gauges 7 (7A, 7B, 7C) are supported by a common gauge holder 6. The gauge holder 6 moves in the Z direction along the guide rail 31 in conjunction with the slider 4. Therefore, when the slider 4 is moved downward in the Z direction, the first insertion gauges 7 (7A, 7B, 7C) supported by the gauge holder 6 are inserted into the first machined holes 91 (91A, 91B, 91C) of the workpiece 9, which is the object to be inspected.

[0055] When the first insertion gauges 7 (7A, 7B, 7C) are inserted into the first machining holes 91 (91A, 91B, 91C) of the workpiece 9, the gauge holes 71 of the first insertion gauges 7 (7A, 7B, 7C) are positioned opposite the corresponding second machining holes 92 (92A, 92B, 92C) (see Figure 3).

[0056] Figure 19 is a diagram illustrating the second insertion gauge 8. Figure 20 illustrates the positional relationship between the gauge hole 71 of the first insertion gauge 7 inserted into the first machining hole 91 of the workpiece 9 and the second machining hole 92. Figure 20(a) schematically shows a cross-section of the workpiece 9 into which the first insertion gauge 7 is inserted, cut along line EE in Figure 1. In Figure 20(a), the position of the second machining hole 92 when viewed from the opening direction of the second machining hole 92 is indicated by a dashed line. Figure 20(b) schematically shows a cross-section along line AA in Figure 20(a). Figure 20(c) schematically shows a cross-section along line BB in Figure 20(b). Figures 21 to 23 illustrate the operation of the second insertion gauge 8. In (b) of Figures 21 to 23, the cross-section along line AA in (a) is schematically shown.

[0057] As shown in Figure 19, the second insertion gauge 8 has a gauge portion 82 at the tip of a rod-shaped gripping portion 81. The gauge portion 82 includes a connection portion 83 with the gripping portion 81, an insertion portion 84 with an outer diameter that matches the inner diameter of the second machining hole 92, and a contact portion 85 having an outer diameter smaller than the insertion portion 84. The connecting portion 83, the insertion portion 84, and the contact portion 85 are cylindrical in shape. The connecting portion 83, the insertion portion 84, and the contact portion 85 are arranged in series on the central axis C81 of the gripping portion 81. The connecting portion 83, the insertion portion 84, the contact portion 85, and the gripping portion 81 are arranged concentrically. The contact portion 85 has an outer diameter D85 that matches the width W71 (see Figure 18) of the gauge hole 71 of the first insertion gauge 7. The area on the tip 85a side of the contact portion 85 is subjected to hardening treatment such as heat treatment (see Figure 20(c)). The contact portion 85 of the second insertion gauge 8 collides with the inner circumference of the first machined hole 91 each time the positional accuracy is checked, so the hardening treatment is applied to prevent wear of the contact portion 85.

[0058] When measuring the machining accuracy (positional accuracy) of the first machining hole 91 and the second machining hole 92, the second insertion gauge 8 is inserted into the second machining hole 92 from the opening direction of the second machining hole 92. When the first insertion gauge 7 is inserted into the first machining hole 91, the gauge hole 71 of the first insertion gauge 7 is positioned opposite the second machining hole 92 (see Figures 20(a) and (b)). In this state, the gauge hole 71 of the first insertion gauge 7 is positioned facing the opening direction of the second machining hole 92 (see Figure 20(c)).

[0059] Here, as shown in Figure 20(c), the width W71 of the gauge hole 71 in the direction perpendicular to the central axis C (the vertical direction in Figure 20(c)) is set to a width that matches the outer diameter D85 of the contact portion 85 on the second insertion gauge 8 side. Therefore, when the second insertion gauge 8 is inserted into the second machining hole 92, if the first machining hole 91 and the second machining hole 92 are formed with good machining accuracy, the contact portion 85 of the first insertion gauge 7 will pass through the gauge hole 71 of the first insertion gauge 7 and contact the inner circumference of the first machining hole 91 (see Figure 21).

[0060] Specifically, when the first machining hole 91 and the second machining hole 92 are appropriately positioned so that they overlap each other when viewed from the opening direction of the second machining hole 92 (see Figure 21(a)), the contact portion 85 of the second insertion gauge 8 enters the gauge hole 71 of the first insertion gauge 7 and contacts the inner circumference of the first machining hole 91 (see Figure 21(b)).

[0061] On the other hand, when viewed from the opening direction of the second machining hole 92, if the first machining hole 91 and the second machining hole 92 are formed with a misalignment in a direction perpendicular to the formation direction of the first machining hole 91 (left-right direction in the figure) (see Figure 22(a)), then the contact portion 85 of the second insertion gauge 8 and the gauge hole 71 of the first insertion gauge 7 are not coaxially arranged on the central axis C81 of the second insertion gauge 8. Therefore, the contact portion 85 of the second insertion gauge 8 comes into contact with the peripheral edge of the gauge hole 71 of the first insertion gauge 7, resulting in a shorter insertion length of the insertion portion 84 into the second machining hole 92 (see Figure 22(b)).

[0062] Furthermore, if the first machining hole 91, which is intended to be formed parallel to the central axis C, is formed at an angle to the central axis C, then even if the first machining hole 91 and the second machining hole 92 are properly positioned so that they overlap each other when viewed from the opening direction of the second machining hole 92 (see Figure 23(a)), the distance from the outer circumference of the base 90 to the first machining hole 91 may differ from the intended distance (see Figure 23(b)). For example, if the first machined hole 91 is misaligned toward the central axis C (left side in the figure), the insertion length of the insertion part 84 into the second machined hole 92 will increase (see Figure 23(b)). Furthermore, if the first machined hole 91 is misaligned toward the side away from the central axis C (to the right in the figure), the insertion length of the insertion portion 84 into the second machined hole 92 will be shortened.

[0063] In the second insertion gauge 8 of this embodiment, a plurality of markers MK1 to MK3 are provided on the outer circumference of the insertion portion 84. The plurality of markers MK1 to MK3 are provided at intervals in the direction of the central axis C81 of the second insertion gauge 8. Markers MK1 to MK3 are strip-shaped markers having a predetermined length in the circumferential direction of the insertion portion 84 and in the insertion direction of the second insertion gauge 8.

[0064] The positions of the markers MK1 to MK3 in the insertion section 84 are set to satisfy the following conditions. (a) When the first machining hole 91 and the second machining hole 92 are formed as planned, the contact portion 85 of the second insertion gauge 8 contacts the inner circumference of the first machining hole 91, and a mark MK3 is provided in the region of the insertion portion 84 located outside the second machining hole 92. (b) When the first machining hole 91 and the second machining hole 92 are formed as planned, and the contact portion 85 of the second insertion gauge 8 contacts the inner circumference of the first machining hole 91, markers MK1 and MK2 are provided in the region located inside the second machining hole 92. (c) When the first machining hole 91 and the second machining hole 92 are formed with a radial misalignment of the central axis, and the contact portion 85 of the second insertion gauge 8 interferes with the periphery of the gauge hole 71 of the first insertion gauge 7, markers MK2 and MK3 are provided in the region located outside the second machining hole 92. (d) When the first machining hole 91 is formed at an angle with respect to the central axis and the first machining hole 91 is displaced toward the central axis C, the contact portion 85 of the second insertion gauge 8 contacts the inner circumference of the first machining hole 91, and markers MK1, MK2, and MK3 are provided in the region located inside the second machining hole 92. (e) When the first machining hole 91 is formed at an angle with respect to the central axis and the first machining hole 91 is displaced away from the central axis C, the contact portion 85 of the second insertion gauge 8 contacts the inner circumference of the first machining hole 91, and markers MK1, MK2, and MK3 are provided in the region located outside the second machining hole 92. In this embodiment, the markers MK1, MK2, and MK3 are provided in this order from the contact portion 85 side of the insertion portion 84.

[0065] As shown in Figure 21(a), for example, if the first machining hole 91 and the second machining hole 92 are appropriately positioned so that they overlap each other when viewed from the opening direction of the second machining hole 92, the contact portion 85 of the second insertion gauge 8 will pass through the gauge hole 71 and contact the inner circumference of the first machining hole 91. In this state, of the marks provided on the outer circumference of the insertion portion 84, only the mark MK3 that is furthest from the contact portion 85 will be visible.

[0066] On the other hand, as shown in Figure 22(a), if, for example, the first machining hole 91 and the second machining hole 92 are offset from each other when viewed from the opening direction of the second machining hole 92, the contact portion 85 of the second insertion gauge 8 will interfere with the first insertion gauge 7. In this state, of the marks provided on the outer circumference of the insertion portion 84, only the mark MK2, which is located in the middle in the direction of the central axis C81 of the second insertion gauge 8, and the mark MK3, which is furthest from the contact portion 85, are visible.

[0067] Furthermore, as shown in Figures 23(a) and (b), for example, if the first machining hole 91 is formed at an angle with respect to the central axis and the first machining hole 91 is shifted toward the central axis C, when the contact portion 85 of the second insertion gauge 8 penetrates the gauge hole 71 and contacts the inner circumference of the first machining hole 91, the marker MK3 furthest from the contact portion 85 also becomes invisible, just like the other markers MK1 and MK2.

[0068] In this case, if the first machining hole 91 is displaced away from the central axis C, the contact portion 85 of the second insertion gauge 8 will pass through the gauge hole 71 and come into contact with the inner circumference of the first machining hole 91. At this point, the marker MK1 closest to the contact portion 85 will also become visible, just like the other markers MK2 and MK3.

[0069] Therefore, after performing a first insertion step (see Figure 1(c)) in which the first insertion gauge 7 is inserted into the first machining hole 91 of the workpiece 9 from the Y direction, a second insertion step (see Figure 1(d)) is performed in which the second insertion gauge 8 is inserted into the second machining hole 92 of the workpiece 9 from the radial direction. By checking which of the multiple marks MK1 to MK3 provided on the second insertion gauge 8 is located on the outside of the workpiece 9, it is possible to confirm whether the two intersecting machining holes (first machining hole 91 and second machining hole 92) have been machined appropriately. The confirmation of the marker (MK) can be done visually by the worker, or it can be done using software by processing images captured by a camera or other device.

[0070] Figure 24 is a diagram illustrating the role of the turntable 21. Figure 24 schematically shows the positional relationship between the workpiece 9 and the turntable 21. As described above, the workpiece 9 is provided with three first machining holes 91A, 91B, and 91C. Each of the first machining holes 91A, 91B, and 91C is connected in a one-to-one relationship to the second machining holes 92A, 92B, and 92C.

[0071] First, with the second machining hole 92A positioned so that its opening faces left in the diagram, the second insertion gauge 8 is inserted into the second machining hole 92A to confirm the machining accuracy between the second machining hole 92A and the first machining hole 91A (see Figure 24(a)).

[0072] Once the insertion of the second insertion gauge 8 into the second machining hole 92A and the confirmation of machining accuracy are complete, the turntable 21 is rotated counterclockwise (CCW) to move the second machining hole 92B to the front of the second insertion gauge 8. As a result, with the second machining hole 92B positioned so that its opening faces left in the figure, the second insertion gauge 8 is inserted into the second machining hole 92B, and the machining accuracy between the second machining hole 92B and the first machining hole 91B is confirmed (see Figure 24(b)).

[0073] Once the insertion of the second insertion gauge 8 into the second machining hole 92B and the confirmation of machining accuracy are complete, the turntable 21 is rotated clockwise (CW) to move the second machining hole 92C to the front of the second insertion gauge 8. As a result, with the second machining hole 92C positioned so that its opening faces left in the figure, the second insertion gauge 8 is inserted into the second machining hole 92C, and the machining accuracy between the second machining hole 92C and the first machining hole 91C is confirmed (see Figure 24(c)).

[0074] In the inspection device 1, the support column 3 that supports the workpiece 9 is fixed to the turntable 21. Therefore, the orientation of the second machining hole 92 that opens on the outer circumference of the workpiece 9 can be changed simply by rotating the turntable 21. As a result, even if the multiple second machining holes 92 (92A, 92B, 92C) into which the second insertion gauge 8 is inserted open in different directions, the turntable 21 can be rotated to position the desired second machining hole 92 (92A, 92B, 92C) toward the side into which the second insertion gauge 8 is inserted. There is no need to change the orientation of the workpiece 9 supported by the support column 3 each time an inspection is performed. Therefore, the positional accuracy of the first machining hole 91 and the second machining hole 92 can be checked smoothly.

[0075] In the above-described embodiment, an example was given of a workpiece 9 in which a first machined hole 91 is opened at one end 9a in the longitudinal direction. The workpiece 9 can be any workpiece in which a second machined hole 92 is opened at at least one end (one end 9a, the other end 9b) in the longitudinal direction. Furthermore, although we have illustrated the case of a workpiece 9 in which one first machining hole 91 is connected to one second machining hole 92, a workpiece in which one first machining hole 91 is connected to multiple second machining holes 92 is also possible. The total number of first machining holes 91 can also be determined as appropriate.

[0076] As described above, the inspection device 1 according to the embodiment has the following configuration. (1) The inspection device 1 is used to inspect the positional accuracy of the machined holes (first machined hole 91, second machined hole 92) provided in the workpiece 9. Work 9 includes: A first machining hole 91 (91A, 91B, 91C) extends through the interior of the workpiece 9 along the central axis C that runs along the longitudinal direction of the workpiece 9, and opens at at least one of the longitudinal ends 9a and 9b of the workpiece 9, The workpiece 9 is provided with second machining holes 92 (92A, 92B, 92C) that extend radially along the central axis C and connect the first machining hole 91 with the outer circumference of the workpiece 9. Inspection device 1 is, A first insertion gauge 7 is inserted into the first machining hole 91, It includes a second insertion gauge 8 which is inserted into the second machining hole 92. The first insertion gauge 7 is provided with a gauge hole 71 (through hole) that penetrates in the direction of the opening of the second machining hole 92, at a position that overlaps with the second machining hole 92 when viewed from the radial direction of the central axis C when the first insertion gauge 7 is inserted into the first machining hole 91 for a specified length. At the tip of the second insertion gauge 8, An insertion portion 84 having an outer diameter that matches the inner diameter of the second machined hole 92, A gauge portion 82 is provided, which has an outer diameter smaller than the insertion portion 84 and a contact portion 85 that penetrates the gauge hole 71 and can contact the inner circumference of the first machining hole 91, and these contact portions are arranged in series on the same axis. The gauge hole 71 is formed with an inner diameter portion (side edge 711, 711) that matches the outer diameter of the contact portion 85. Markers MK1 to MK3 are provided on the outer circumference of the insertion portion 84 to allow visual confirmation of the insertion length of the gauge portion 82 into the second machining hole 92.

[0077] According to the embodiment, when viewed from the opening direction of the second machining hole 92, if the first machining hole 91 and the second machining hole 92 are machined with good positional accuracy (machined with a predetermined positional degree in the radial direction of the central axis C), the contact portion 85 of the second insertion gauge 8 penetrates the gauge hole 71 of the first insertion gauge 7 and contacts the inner circumference of the first machining hole 91 (see Figure 21). On the other hand, if the first machining hole 91 and the second machining hole 92 are machined with a radial displacement of the central axis C when viewed from the opening direction of the second machining hole 92, the contact portion 85 of the second insertion gauge 8 will interfere with the first insertion gauge 7 and will not be able to penetrate the gauge hole 71 (see Figure 22). Therefore, the insertion length of the gauge portion 82 (contact portion 85) into the second machined hole 92 will differ depending on whether the first machined hole 91 and the second machined hole 92 are machined with good positional accuracy. When the first machined hole 91 and the second machined hole 92 are machined with good positional accuracy, by marking the boundary between the area inserted into the second machined hole 92 and the area not inserted in the insertion part 84, it is possible to confirm whether the first machined hole 91 and the second machined hole 92 are machined with good positional accuracy simply by looking at the mark. Therefore, according to this embodiment, the positional accuracy can be appropriately confirmed in a workpiece 9 having intersecting oil holes (machined holes).

[0078] (2) The gauge hole 71 is an elongated hole with length in the direction of the central axis C (see Figure 18). When viewed from the opening direction of the second machining hole 92, the width W71 of the gauge hole 71 in the direction perpendicular to the opening direction of the first machining hole 91 and the opening direction of the second machining hole 92 is narrower than the inner diameter D92 of the second machining hole 92 (see Figure 20).

[0079] According to the embodiment, when viewed from the opening direction of the second machined hole 92, it is possible to appropriately check whether or not there is a misalignment in the radial direction (left-right direction in Figure 21(a) and Figure 22(a)) of the central axis C between the first machined hole 91 and the second machined hole 92. If the workpiece 9 is a transmission shaft, high precision is required for the radial positional accuracy of the central axis C between the first machined hole 91 and the second machined hole 92. On the other hand, the positional accuracy of the central axis C between the first machined hole 91 and the second machined hole 92 has a lower priority than the radial positional accuracy of the central axis C. By configuring the system as described above, even if there is some misalignment in the direction of the central axis C, the radial positional accuracy of the central axis C can be measured appropriately. This ensures the required positional accuracy while suppressing a decrease in yield for workpieces 9 that have intersecting machined holes.

[0080] (3) The workpiece 9 is provided with multiple first machining holes 91 (91A, 91B, 91C). Each of the first machining holes 91 (91A, 91B, 91C) is connected to at least one second machining hole 92 (92A, 92B, 92C). The first insertion gauges 7 are provided in the same number as the first machining holes 91. Multiple first insertion gauges 7 (7A, 7B, 7C) are supported by a common gauge holder 6.

[0081] According to this embodiment, by moving the common gauge holder 6 in the direction of the central axis C, the first insertion gauges 7 (7A, 7B, 7C) can be inserted into each of the first machining holes 91 (91A, 91B, 91C). Compared to the method of sequentially inserting a single first insertion gauge 7 into each of the first machined holes 91 (91A, 91B, 91C) to inspect the positional accuracy between the first machined hole 91 and the second machined hole 92, this method is expected to reduce the time required for inspection and the labor costs associated with the inspection.

[0082] (I) Markers MK1 to MK3 are provided in multiple locations at intervals in the insertion direction of the second insertion gauge 8 (direction of the central axis C81).

[0083] If there is only one marker, and the marker is located inside the second machining hole 92 and cannot be seen, the inspector must insert and remove the second insertion gauge 8 to confirm whether the marker is inside the second machining hole 92. For example, even if marker MK2 is located inside the second machining hole 92, by positioning another marker MK3 outside the second machining hole 92, it is possible to confirm that marker MK2 is located inside the second machining hole 92 by visualizing the other marker MK3, even if marker MK2 is not visible. This eliminates the need for the inspector to insert and remove the second insertion gauge 8, effectively preventing the inspection time from being extended by the time required for insertion and removal. This is expected to reduce the labor costs required for inspection.

[0084] (II) Markers MK1 to MK3 are strip-shaped markers having a predetermined length in the circumferential direction of the insertion section 84 and in the insertion direction of the second insertion gauge 8 (left-right direction in Figure 19).

[0085] According to this embodiment, the markers MK1 to MK3 are formed over a circumferential range around an axis (central axis C81) that is aligned with the insertion direction of the second insertion gauge 8 into the second machining hole 92 (the opening direction of the second machining hole 92). This allows for the insertion of the second insertion gauge 8 into the second machining hole 92 without having to worry about its circumferential orientation around the central axis C81. By simply inserting the second insertion gauge 8 into the second machining hole 92, a visible mark can be confirmed after insertion. If the marker is, for example, a point with a narrow circumferential range, and the marker cannot be visually identified, it is necessary to rotate the second insertion gauge 8 in the circumferential direction around the central axis C81. As described above, since the markers are formed over a circumferential range around the central axis C81, the operator performing the inspection does not need to rotate the second insertion gauge 8, thus effectively preventing an increase in the inspection time. This is expected to reduce the labor costs required for inspection.

[0086] (4) The inspection device 1 has a support column 3 on which the gauge holder 6 is movably mounted. The support column 3 is oriented along the central axis Z1 (rotation axis) of the turntable 21. The support column 3 has a locking portion 38 into which the workpiece 9, which is positioned along the central axis Z1, is locked, The device includes a workpiece holder 34 that elastically engages with one end 9a of the workpiece 9 in the longitudinal direction from the direction of the central axis C. When viewed from the direction of the central axis Z1, the work holder 34 is provided with an insertion hole 345 for the first insertion gauge 7 at a position that overlaps with the first machining hole 91 of the workpiece 9.

[0087] According to this embodiment, the locking portion 38 and the work holder 34 allow the workpiece 9 to be held in an orientation aligned with the central axis Z1 of the inspection device 1. Furthermore, because the work holder 34 is equipped with an insertion hole 345 for the first insertion gauge 7, when the slider 4 is moved in the direction of the central axis Z1, the first insertion gauges 7 (7A, 7B, 7C) can be smoothly inserted into the corresponding first machining holes 91 (91A, 91B, 91C). This effectively prevents delays in the inspection process caused by difficulties in inserting the first insertion gauge 7 into the first machining hole 91. Therefore, a reduction in the labor costs required for inspection can be expected.

[0088] (III) In the inspection device 1, a restricting section 37 is provided on the support column 3. The restricting portion 37 has a support portion for a positioning screw 375. The tip 376 of the screw 375 contacts the outer circumference (contact groove 95) of the workpiece 9 from the radial direction of the central axis C, or is inserted into the second machined hole 92D, thereby restricting the rotation of the workpiece 9.

[0089] The rotation of the workpiece 9 held by the inspection device 1 can be restricted. In particular, by having the tip 376 of the screw 375 contact the contact groove 95 provided on the outer circumference of the workpiece 9 from the radial direction, both the axial displacement and circumferential rotation of the workpiece 9 can be effectively restricted.

[0090] (IV) In the gauge holder 6, the first insertion gauge 7 is cantilevered at one end in the longitudinal direction. The first insertion gauge 7 has a gauge hole 71 at the other end in the longitudinal direction.

[0091] By inserting the first insertion gauge 7 into the insertion holes 63 (63A, 63B, 63C) provided in the gauge holder 6, and supporting a predetermined range on one end of the first insertion gauge 7 with the gauge holder 6, the swinging of the other end of the first insertion gauge 7, which is cantilevered by the gauge holder 6, can be suppressed. This allows the first insertion gauges 7 (7A, 7B, 7C) to be smoothly inserted into their respective first machining holes 91 (91A, 91B, 91C). This effectively prevents delays in the inspection process caused by the difficulty in inserting the first insertion gauges 7 (7A, 7B, 7C) into the first machining holes 91 (91A, 91B, 91C). Therefore, a reduction in the labor costs required for inspection can be expected.

[0092] (V) The first insertion gauge 7 is provided with a through hole 72 in the area to be inserted into the insertion holes 63 (63A, 63B, 63C). The gauge holder 6 is provided with a communication hole 613 that communicates radially with the insertion holes 63 (63A, 63B, 63C). A positioning pin 65 inserted into the communication hole 613 engages with the through hole 72, thereby preventing the first insertion gauge 7 from falling out of the communication hole 613 and restricting the rotation of the first insertion gauge 7.

[0093] With this configuration, by preparing multiple first insertion gauges 7 of different lengths, the appropriate first insertion gauge 7 can be selected and attached to the gauge holder 6 according to the length of the first machined hole 91 in the workpiece 9 to be inspected. If the first insertion gauge 7 were fixed to the gauge holder 6, it would be necessary to prepare a gauge holder 6 with a first insertion gauge 7 for each workpiece 9 to be inspected. However, because the first insertion gauge 7 is interchangeable, it is possible to handle multiple types of workpieces 9 simply by preparing first insertion gauges 7 of different lengths. This reduces the total number of accessories for the inspection device 1 and suppresses the increase in the manufacturing cost of the inspection device 1.

[0094] (5) The inspection device 1 includes a slider 4 that supports the gauge holder 6 and a guide rail 31 that engages with the slider 4 so as to be movable in the direction of the central axis Z1. In the support column 3, the guide rail 31 is installed in a direction aligned with the central axis Z1. In slider 4, the gauge holder 6 is provided so as to be rotatable around an axis along the central axis Z1.

[0095] When multiple first insertion gauges 7 are supported by the gauge holder 6, there may be a misalignment in the positional relationship between each of the first insertion gauges 7 and the corresponding first machining hole 91 on the workpiece 9 when viewed from the Z direction. If the gauge holder 6 is fixed to the slider 4, it is necessary to temporarily remove the gauge holder 6 from the slider 4 and adjust the misalignment in the positional relationship. Here, as viewed from the Z direction, multiple first machining holes 91 are provided at intervals in the circumferential direction around the central axis C. By providing the gauge holder 6 in the slider 4 so as to be rotatable around an axis along the Z direction, the positional relationship between each of the first insertion gauges 7 and the corresponding first machining holes 91 on the workpiece 9 side can be adjusted simply by rotating the gauge holder 6. This effectively prevents delays in inspection time caused by difficulties in attaching the gauge holder 6 to the slider 4. Therefore, a reduction in the labor costs required for inspection can be expected.

[0096] (VI) In the support column 3, ball plungers 10, 10 are provided at intervals in the Z direction, which function as stoppers that define the range of movement of the slider 4 in the Z direction.

[0097] With this configuration, the ball plungers 10, 10, which function as stoppers, can control the insertion length of the first insertion gauge 7 into the first machining hole 91. This allows the first insertion gauge 7, once inserted into the first machining hole 91, to always be positioned at a predetermined location in the direction of the central axis C, so that, when viewed from the opening direction of the second machining hole 92, the gauge hole 71 of the first insertion gauge 7 and the second machining hole 92 overlap. This enables smooth inspection of the positional accuracy of the second machining hole 92 and the first machining hole 91.

[0098] (VII) The support column 3 is mounted on a turntable 21 that is rotatable around a central axis Z1 along the Z direction.

[0099] If the transmission shaft is the workpiece 9 being inspected, then multiple second machined holes 92 may be formed in the workpiece 9 at different phases in the circumferential direction around the central axis C. In such cases, the orientation of the workpiece 9 supported by the support column 3 can be adjusted simply by rotating the turntable 21, without having to remove the workpiece 9. This effectively prevents delays in the inspection process. Therefore, a reduction in the labor costs associated with the inspection can be expected.

[0100] According to this embodiment, it can also be specified as an inspection method for inspecting the positional accuracy of machined holes provided in a workpiece 9 using the inspection device 1. (6) The testing method is: The steps include: positioning the workpiece 9 in an orientation aligned with the central axis Z1 of the inspection device 1 using the workpiece holder 34 and the locking portion 38 (preparation step); The process involves moving the gauge holder 6 in the direction of the central axis Z1 to insert multiple first insertion gauges 7 (7A, 7B, 7C) into the corresponding first machining holes 91 (91A, 91B, 91C) and positioning them in the specified locations (first insertion step), and The process involves inserting the gauge portion 82 of the second insertion gauge 8 into one of the multiple second machining holes 92 (92A, 92B, 92C) from the opening direction of the second machining hole 92 (92A, 92B, 92C) (second insertion step), The method includes a step (confirmation step) of confirming the positional accuracy of the first machining hole 91 and the second machining hole 92 based on the mark MK1 to MK3 located outside the second machining hole 92, among the marks MK1 to MK3 provided on the insertion portion 84 of the second insertion gauge 8. The steps of inserting the gauge portion 82 of the second insertion gauge 8 (second insertion step) and confirming the positional accuracy of the first machining hole 91 and the second machining hole 92 (confirmation step) are performed sequentially for all second machining holes 92.

[0101] According to this embodiment, the inspection device 1 sequentially performs the following steps: a preparation step (see Figure 1(b)), a first insertion step (see Figure 1(c)), a second insertion step (see Figure 1(d)), and a verification step. Then, when the second insertion process is performed, by checking which of the multiple markers MK1 to MK3 provided on the second insertion gauge 8 is located on the outside of the workpiece 9, it is possible to confirm whether the two intersecting machined holes (first machined hole 91 and second machined hole 92) have been machined properly. By simply checking the markings on the second insertion gauge 8, it is possible to confirm whether the first machining hole 91 and the second machining hole 92 have been machined with good positional accuracy. Therefore, according to this embodiment, the positional accuracy can be appropriately confirmed in a workpiece 9 having intersecting oil holes (machined holes).

[0102] Although embodiments of the present invention have been described above, these embodiments are merely examples of how the present invention can be applied, and are not intended to limit the technical scope of the present invention to the specific configurations of these embodiments. Modifications can be made as appropriate within the scope of the technical idea of ​​the invention. [Explanation of Symbols]

[0103] 1: Inspection device, 3: Support column, 34: Work holder, 345: Through hole, 38: Locking part, 6: Gauge holder, 7 (7A, 7B, 7C): First insertion gauge, 8: Second insertion gauge, 82: Gauge part, 81: Gauge hole (through hole), 84: Insertion part, 85: Contact part, 9: Workpiece, 91 (91A, 91B, 91C): First machining hole (machining hole), 92 (92A, 92B, 92C): Second machining hole (machining hole), C: Central axis, MK (MK1, MK2, MK3): Marker

Claims

1. An inspection device used for inspecting the positional accuracy of machined holes in a workpiece, The aforementioned workpiece includes, A first machined hole extends through the interior of the workpiece along a central axis that is aligned with the longitudinal direction of the workpiece, and opens at least one of the two ends of the workpiece in the longitudinal direction, The workpiece is provided with a second machining hole that extends radially in the direction of the central axis and connects the first machining hole with the outer circumference of the workpiece. The inspection device, A first insertion gauge inserted into the first machining hole, The device comprises a second insertion gauge inserted into the second machining hole, The first insertion gauge is provided with a through hole that penetrates the opening direction of the second machining hole at a position that overlaps with the second machining hole when viewed from the radial direction of the central axis when the first insertion gauge is inserted into the first machining hole for a specified length. The second insertion gauge is, An insertion portion having an outer diameter that matches the inner diameter of the second machined hole, The gauge portion has an outer diameter smaller than the insertion portion and a contact portion that penetrates the through hole and can contact the inner circumference of the first machined hole, and these contact portions are connected in series on the same axis. The through hole is formed with an inner diameter that matches the outer diameter of the contact portion. An inspection device wherein the outer circumference of the insertion portion is provided with a mark that allows the insertion length of the gauge portion into the second machined hole to be visually confirmed.

2. In claim 1, The through hole is an elongated hole having a length in the direction of the central axis, An inspection device in which, when viewed from the opening direction of the second processed hole, the width of the through hole in the direction perpendicular to the opening direction of the first processed hole and the opening direction of the second processed hole is narrower than the inner diameter of the second processed hole.

3. In claim 1 or claim 2, The workpiece is provided with a plurality of the first machining holes, Each of the first machined holes is connected to at least one of the second machined holes. The first insertion gauges are provided in the same number as the first machining holes. An inspection device in which the plurality of first insertion gauges are supported by a common gauge holder.

4. In claim 3, A support column that supports the gauge holder so as to be movable in the central axis direction, A locking portion is provided which a workpiece, supported by the aforementioned support column and positioned along the central axis, is locked, The workpiece holder is supported by the aforementioned support column and elastically engages with one end of the workpiece in the longitudinal direction from the central axis direction, An inspection device wherein, when viewed from the direction of the central axis, the work holder is provided with an insertion hole for the first insertion gauge at a position that overlaps with the first machining hole of the workpiece.

5. In claim 4, The gauge holder is supported by a slider that is supported by the support column so as to be movable in the central axis direction, An inspection device in which the gauge holder in the slider is provided to be rotatable around an axis along the central axis.

6. An inspection method for inspecting the positional accuracy of a machined hole provided in a workpiece using the inspection device described in claim 4, The steps include: positioning the workpiece in an orientation along the central axis using the locking portion and the engaging portion; The steps include moving the gauge holder in the central axis direction to insert the multiple first insertion gauges into the corresponding first machining holes and position them in a predetermined location, The method includes the step of inserting the gauge portion of the second insertion gauge into one of the multiple second machining holes from the opening direction of the second machining hole, and confirming the positional accuracy of the first machining hole and the second machining hole based on the position of the mark provided on the insertion portion. An inspection method in which the step of confirming the positional accuracy of the first machined hole and the second machined hole is performed sequentially for all second machined holes.

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