Inner diameter measurement system and inner diameter measurement method

Abstract

To provide an inner diameter measurement system and an inner diameter measurement method capable of measuring a measurement hole without using an inner diameter guide.SOLUTION: An inner diameter measurement system IDMS includes: a chuck device 20 having a plurality of pawl parts 21 aligned and arranged around an axial circumference of a first central axis (central axis Ck); and an inner diameter measurement device 10 configured to cause a contact piece to contact with an inner diameter surface 110 of a measurement hole 100 of a work piece W held by the chuck device 20 to measure an inner diameter of the measurement hole 100. The chuck device 20 holds the work piece W in a state where the first central axis and a second central axis being a central axis Cw of the measurement hole 100 are aligned, through moving the plurality of pawl parts 21 inward in a radial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inner diameter measurement system and an inner diameter measurement method. [Background technology]

[0002] There is known an inner diameter measurement device that measures the inner diameter of a measurement hole in a workpiece by bringing a contactor into contact with the inner diameter surface of the measurement hole (see, for example, Patent Document 1). This inner diameter measurement device includes an inner diameter guide that protects the inner diameter of the measurement hole, and a pair of linear measurement arms housed in the inner diameter guide. A contactor is attached to the tip of the measurement arm. When measuring the inner diameter of the measurement hole, first, the inner diameter guide is inserted into the measurement hole. Then, with the inner diameter guide inserted in the measurement hole, the pair of measurement arms are opened to bring the contactor into contact with the inner diameter surface of the measurement hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-201704 Summary of the Invention [Problem to be solved by the invention]

[0004] With the above-mentioned inner diameter measurement device, an inner diameter guide must be inserted into the measurement hole to measure the inner diameter of the measurement hole. Therefore, every time the size of the measurement hole changes, the inner diameter guide must be changed to match the measurement hole, which is time-consuming.

[0005] An object of the present invention is to provide an inner diameter measurement system and an inner diameter measurement method that can measure a measurement hole without using an inner diameter guide. [Means for solving the problem]

[0006] An inner diameter measurement system according to an aspect of the present invention includes a chuck device having a plurality of jaws arranged in a line around a first central axis, and an inner diameter measurement device that measures the inner diameter of a measurement hole by bringing a contactor into contact with the inner diameter surface of the measurement hole of a workpiece held by the chuck device, and the chuck device holds the workpiece in a state where the first central axis and a second central axis, which is the central axis of the measurement hole, are aligned by moving the plurality of jaws radially inward. The contact is provided so that it is inserted into the measurement hole when the workpiece is held by the chuck device. .

[0007] An inner diameter measurement method according to an aspect of the present invention is an inner diameter measurement method for measuring the inner diameter of a measurement hole in a workpiece, and includes: holding the workpiece in a state in which a first central axis, which is the central axis of the chuck device, is aligned with a second central axis, which is the central axis of the measurement hole, by moving multiple jaws of a chuck device radially inward; and measuring the inner diameter of the measurement hole by bringing a contact into contact with the inner diameter surface of the measurement hole in the workpiece held by the chuck device. When the workpiece is held by the chuck device, the contact is inserted into the measurement hole. . [Effects of the Invention]

[0008] An inner diameter measurement system according to one aspect of the present invention includes a chuck device having multiple jaws arranged in a row around a first central axis, and an inner diameter measurement device that measures the inner diameter of a measurement hole in a workpiece held by the chuck device by contacting a contact with the inner diameter surface of the measurement hole. The chuck device holds the workpiece while aligning the first central axis with a second central axis, which is the center axis of the measurement hole, by moving the multiple jaws radially inward. An inner diameter measurement method according to another aspect of the present invention includes: holding the workpiece while aligning the first central axis, which is the center axis of the chuck device, with the second central axis, which is the center axis of the measurement hole, by moving the multiple jaws of the chuck device radially inward; and measuring the inner diameter of the measurement hole by contacting a contact with the inner diameter surface of the measurement hole in the workpiece held by the chuck device. This configuration allows the inner diameter of the measurement hole to be measured without using an inner diameter guide, eliminating the need to replace the inner diameter guide. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view of the inner diameter measurement system IDMS according to the present embodiment. [Figure 2] FIG. 2 is a side cross-sectional view of the inner diameter measurement system IDMS according to the present embodiment. [Figure 3] FIG. 2 is a diagram showing an inner diameter measurement device in an initial state according to the present embodiment. [Figure 4] 1 is a diagram showing a state in which a workpiece is inserted into a chuck device according to the present embodiment. FIG. [Figure 5] FIG. 1 is a diagram showing how the chuck device according to the present embodiment holds a workpiece in a centered manner. [Figure 6] FIG. 2 is a diagram showing a closed state according to the present embodiment. [Figure 7] FIG. 10 is a diagram illustrating an open state according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described below through embodiments, but the following embodiments do not limit the scope of the invention. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In the drawings, identical or similar parts may be designated by the same reference numerals, and redundant explanations may be omitted. Furthermore, the shapes and sizes of elements in the drawings may be exaggerated for clarity, and may differ in shape and size from the actual product.

[0011] In Figure 1, the directions in the figure may be explained using the XYZ coordinate system. In the XYZ coordinate system, a plane parallel to the horizontal plane is the XY plane. One direction in this XY plane is referred to as the X direction, and the direction perpendicular to the X direction is referred to as the Y direction. Furthermore, the direction perpendicular to the XY plane is referred to as the Z direction.

[0012] Fig. 1 is a plan view of the inner diameter measurement system IDMS according to this embodiment. Fig. 2 is a side cross-sectional view of the inner diameter measurement system IDMS according to this embodiment. The inner diameter measurement system IDMS includes an inner diameter measurement device (bore gauge) 10 and a chuck device 20.

[0013] The inner diameter measuring device 10 measures the inner diameter of a hole formed in a workpiece W. In the example shown in Figs. 1 and 2, the workpiece W has a cylindrical shape, but it may have a shape other than cylindrical. The inner diameter measuring device 10 is fixed to, for example, a machine tool. Hereinafter, the hole whose inner diameter is measured by the inner diameter measuring device 10 may be referred to as the "measurement hole 100."

[0014] The inner diameter measurement device 10 comprises a pair of measuring arms 11 and a measuring head 12. When distinguishing between the pair of measuring arms 11, one measuring arm 11 will be referred to as "measuring arm 11a" and the other measuring arm 11 will be referred to as "measuring arm 11b." In addition, in order to distinguish between multiple components of the same type, the letter "a" may be added to the end of the reference numeral for each component of measuring arm 11a, and the letter "b" may be added to the end of the reference numeral for each component of measuring arm 11b.

[0015] The measuring arm 11 includes a first portion 30 extending in a first direction, a second portion 35 extending in a second direction different from the first direction, and a contactor 40 provided on the second portion 35.

[0016] The first portion 30 extends in a first direction. In the example shown in Fig. 1 and Fig. 2, the first direction is the X direction. A first end of the first portion 30 is pivotally supported by the measurement head 12. In the example shown in Fig. 1, the first end of the first portion 30 is pivotally supported so as to be rotatable about an axis parallel to the Z direction.

[0017] The second portion 35 extends from the second end of the first portion 30 while bending in a second direction. The second direction is a direction intersecting the first direction. In the example shown in FIGS. 1 and 2, the second direction is a direction perpendicular to the first direction. That is, the measuring arm 11 shown in FIGS. 1 and 2 is bent in an L-shape. The second direction shown in the drawings is the Z direction.

[0018] 1 and 2, when the first portion 30 is viewed so that the first direction is parallel to the X direction, the second portion 35 is bent in the +Z direction from the second end of the first portion 30. The second portion 35 may be a separate member from the first portion 30, or may be a member integral with the first portion 30. The shape of the measuring arm 11 does not necessarily have to be L-shaped. In other words, the second direction is not limited to a direction perpendicular to the first direction, but may be any direction that intersects with the first direction.

[0019] The contactor 40 is provided at the tip of the second portion 35. The tip means a portion including a certain range from the tip (top end) of the second portion 35 in the axial direction of the second portion 35 (the −Z direction shown in FIG. 1 ).

[0020] The contactor 40 is attached to the tip of the second portion 35 so as to be perpendicular to the axial direction of the second portion 35. In the example shown in FIG. 1, the contactor 40 is attached so as to be perpendicular to the Y direction side of the axial direction of the second portion 35. Specifically, the contactor 40a of the measuring arm 11a is attached on the +Y direction side, and the contactor of the measuring arm 11b is attached on the -Y direction side. However, the contactor 40 may be attached at an angle to the axial direction of the second portion 35. The shape of the contactor 40 is not particularly limited, but in the example shown in FIG. 1, it is formed in a hemispherical shape.

[0021] The measurement head 12 rotatably supports the first ends of the pair of measurement arms 11a and 11b. The measurement head 12 measures the inner diameter of the measurement hole 100. For example, the measurement head 12 has a sensor that detects the displacement of the two contacts 40a and 40b, and measures the inner diameter of the measurement hole 100 based on the detection result of the sensor.

[0022] When the inner diameter measurement device 10 measures the inner diameter of the measurement hole 100 of the workpiece W held by the chuck device 20, the measurement arm 11a and the measurement arm 11, which are in a closed state, are rotated to bring the contacts 40a and 40b into contact with the inner diameter surface 110 of the measurement hole 100. Hereinafter, the measurement arm 11a and the measurement arm 11 in a closed state may be referred to as the "closed state." Also, the state in which the contacts 40a and 40b are in contact with the inner diameter surface 110 of the measurement hole 100 may be referred to as the "open state."

[0023] The displacement of contacts 40a and 40b from the closed state to the open state corresponds to the inner diameter of measurement hole 100. Therefore, inner diameter measurement device 10 measures the inner diameter of measurement hole 100 by detecting the displacement of contacts 40a and 40b from the closed state to the open state using one or more sensors. Note that measurement head 12 only needs to be able to directly or indirectly detect the displacement of contacts 40a and 40b, and the type of sensor and the detection method are not particularly limited. For example, when contacts 40a and 40b come into contact with inner diameter surface 110 of measurement hole 100, measurement head 12 may output a signal corresponding to the displacement of contacts 40a and 40b to the outside as the inner diameter of measurement hole 100.

[0024] The chuck device 20 holds the workpiece W. The chuck device 20 has, for example, three jaws 21 for gripping the workpiece W and a main body 22 that holds the workpiece W movably in a radial direction relative to a central axis Ck of the chuck device 20. The central axis Ck shown in the figure is an axis parallel to the Z direction. The three jaws 21 are provided at equal intervals along a predetermined circumferential direction centered on the central axis Ck.

[0025] The claws 21 are arranged side by side around the central axis Ck. Each claw 21 moves forward and backward between an open position and a closed position along the radial direction. When each claw 21 is in the open position, a space K (FIG. 3) into which the workpiece W can be inserted is formed inside the three claws 21. After the workpiece W is inserted into the space K, when each claw 21 is moved radially inward (toward the closed position), the workpiece W is held immovably by the three claws 21.

[0026] Here, when the workpiece W is held by the chuck device 20, the central axis Cw of the workpiece W and the central axis Ck of the chuck device 20 coincide with each other. In other words, the chuck device 20 is a so-called centering type chuck that holds the workpiece W in a state in which the central axis Cw of the workpiece W (measurement hole 100) coincides with the central axis Ck of the chuck device 20. Note that the act of aligning the central axis Cw of the workpiece W (measurement hole 100) with the central axis Ck of the chuck device 20 is sometimes referred to as "centrifugation."

[0027] The inner diameter measurement method according to this embodiment will be described below with reference to FIGS.

[0028] Fig. 3 is a diagram showing the initial state of the inner diameter measurement device 10. As shown in Fig. 3, in the initial state, the inner diameter measurement device 10 is arranged with the pair of measuring arms 11a and 11b closed (closed state).

[0029] Specifically, each first portion 30 is disposed above the main body 22 of the chuck device 20 and at a position lower than each of the claw portions 21, so as to extend along the first direction, that is, the Z direction. Each first portion 30 is inserted between two of the claw portions 21 and does not interfere with the claw portions 21. When viewed from the Y direction, each first portion 30 extends in the +X direction until the second end of the first portion 30 is positioned on the central axis Ck.

[0030] In the initial state, each second portion 35 extends along the +Z direction within the space K. Furthermore, in the initial state, the center position CP (FIG. 6) between the axes of each second portion 35 in the closed state is located on the central axis Cw.

[0031] When the inner diameter measurement device 10 is in an initial state, an operator or a loader device inserts a workpiece W into the space K of the chuck device 20 (FIG. 4). When the workpiece W is inserted into the space K, the chuck device 20 moves each of the jaws 21 radially inward to center and hold the workpiece W (FIG. 5). In other words, when the chuck device 20 holds the workpiece W, the workpiece W is fixed in place with the central axis Cw of the workpiece W and the central axis Ck of the chuck device 20 aligned.

[0032] When the workpiece W is held by the chuck device 20, the pair of contacts 40a, 40b are disposed inside the workpiece W. That is, the contacts 40a, 40b are inserted into the measurement hole 100 of the workpiece W. In this state, the contacts 40a, 40b are positioned above the lower end of the inner diameter surface 110, and therefore, when the measurement arms 11a, 11b rotate on a horizontal plane, the contacts 40a, 40b come into contact with the inner diameter surface 110 of the measurement hole 100.

[0033] In this way, as shown in Figure 6, the chuck device 20 aligns the central axis Ck, which passes through the center position CP between the axes of the pair of second parts 35 and is parallel to the second direction, with the central axis Cw of the measurement hole 100, and holds the workpiece W so that the pair of contacts 40a, 40b are positioned inside the workpiece W.

[0034] With the workpiece W held by the chuck device 20 (FIG. 6), the inner diameter measurement device 10 transitions the pair of measurement arms 11a, 11b from a closed state to an open state (FIG. 7). Specifically, as shown in FIG. 7, the inner diameter measurement device 10 opens the pair of measurement arms 11a, 11b until the contacts 40a, 40b contact the inner peripheral surface. Opening the pair of measurement arms 11a, 11b means, for example, rotating them in a first rotation direction and rotating the measurement arm 11b in a second rotation direction opposite to the first rotation direction. The inner diameter measurement device 10 measures the amount of displacement of the contacts 40a and 40b from the closed state to the open state as the inner diameter of the measurement hole 100.

[0035] In this way, the inner diameter measurement device 10 according to this embodiment can measure the hole diameter of the measurement hole 100 without using an inner diameter guide. With this configuration, there is no need to insert an inner diameter guide into the measurement hole 100, so even if the size of the measurement hole 100 changes, there is no need to take the time to replace the inner diameter guide. Furthermore, because the inner diameter measurement device 10 according to this embodiment does not use an inner diameter guide, it is possible to measure even smaller measurement holes 100. Therefore, even if the size of the measurement hole 100 changes, the inner diameter measurement device 10 can continue to be used, reducing the time required to replace it with an inner diameter measurement device that matches the size of the measurement hole 100.

[0036] In conventional inner diameter measurement devices using an inner diameter guide, the size of the inner diameter guide is made as large as possible to ensure sufficient space for the measuring arm to open and close. However, when the size of the inner diameter guide is increased, the clearance between the inner diameter surface 110 of the measurement hole 100 and the inner diameter guide becomes very narrow. As a result, when the inner diameter guide is inserted into the measurement hole 100, the inner diameter guide may damage the inner diameter surface 110 of the measurement hole 100. The inner diameter measurement device 10 according to this embodiment can measure the diameter of the measurement hole 100 without using an inner diameter guide, so that when the loader device places the workpiece W on the chuck device 20 and inserts the measuring arm 11 into the measurement hole 100, the inner diameter guide can prevent damage to the inner diameter surface 110 of the measurement hole 100 by the inner diameter guide.

[0037] The above embodiment discloses the following configuration. (Configuration 1) An inner diameter measurement device (10) that measures the inner diameter of a measurement hole (100) in a workpiece (W) by bringing a contact (40) into contact with an inner diameter surface (110) of the measurement hole (100), A pair of openable and closable measuring arms 11 is provided. Each measuring arm 11 is a first portion 30 extending in a first direction; a second portion 35 that bends and extends from an end of the first portion 30 in a second direction that intersects with the first direction, The inner diameter measurement device 10 has a contactor 40 provided at the tip of the second portion 35. (Configuration 2) The second direction is a direction perpendicular to the first direction. The inner diameter measurement device 10 according to configuration 1. (Configuration 3) A measuring head 12 is provided which rotatably supports a pair of measuring arms 11, The first portion 30 has a first end portion pivotably supported on the measurement head, and extends and protrudes from the measurement head 12 in a first direction; The second portion 35 extends in a second direction from the second end of the first portion 30. The inner diameter measurement device 10 according to the first or second aspect. (Configuration 4) a chuck device 20 having a plurality of jaws 21 arranged side by side around a first central axis (central axis Ck); an inner diameter measurement device (10) that measures the inner diameter of the measurement hole (100) by bringing a contactor into contact with the inner diameter surface (110) of the measurement hole (100) of the workpiece (W) held by the chuck device (20); The chuck device 20 holds the workpiece W in a state where the first central axis and the second central axis, which is the central axis Cw of the measurement hole 100, are aligned by moving the multiple jaws 21 radially inward. The inner diameter measurement device 10 has a pair of openable and closable measurement arms 11, Each measuring arm 11 is a first portion 30 extending in a first direction; a second portion 35 that bends and extends from an end of the first portion 30 in a second direction that intersects with the first direction, An inner diameter measurement system IDMS in which a contactor 40 is provided at the tip of the second portion 35. (Configuration 5) The inner diameter measurement device 10 or inner diameter measurement system IDMS according to any one of configurations 1 to 4, wherein the second direction is a direction perpendicular to the first direction and parallel to the axial direction of the first central axis. (Configuration 6) The chuck device 20 has a main body 22 that holds a plurality of jaws 21 so as to be movable in the radial direction, The first portion 30 extends in the first direction at a position higher than the main body 22 and lower than the plurality of claws 21. The second portion 35 extends vertically upward from the end of the first portion 30, An inner diameter measurement device 10 or inner diameter measurement system IDMS described in any one of configurations 1 to 5, wherein when the workpiece W is held by the chuck device 20, the tip of the second part 35 is inserted into the measurement hole 100 from below the workpiece W.

[0038] One or more of the requirements described in the above-described embodiments may be omitted. Furthermore, the requirements described in the above-described embodiments may be combined as appropriate. Furthermore, the execution order of each procedure shown in this embodiment may be realized in any order, as long as the results of a previous procedure are not used in a subsequent procedure. Furthermore, even if the operations in the above-described embodiments are described using terms such as "first," "next," and "followed" for convenience, it is not essential that they be performed in this order. [Explanation of symbols]

[0039] 10....Inner diameter measuring device, 11....Measuring arm, 20....Chuck device, 30....First part, 35....Second part, 40....Contactor, IDMS...Inner diameter measuring system

Claims

1. a chuck device having a plurality of jaw portions arranged side by side around a first central axis; an inner diameter measurement device that measures the inner diameter of the measurement hole by bringing a contactor into contact with the inner diameter surface of the measurement hole of the workpiece held by the chuck device, The chuck device holds the workpiece in a state where the first central axis and a second central axis, which is the central axis of the measurement hole, are aligned by moving the plurality of jaw portions radially inward, An inner diameter measurement system, wherein the contactor is arranged so as to be inserted into the measurement hole when the workpiece is held by the chuck device.

2. An inner diameter measurement method for measuring the inner diameter of a measurement hole in a workpiece, comprising: a plurality of jaws of a chuck device move radially inward, thereby holding the workpiece in a state in which a first central axis, which is a central axis of the chuck device, and a second central axis, which is a central axis of the measurement hole, are aligned; measuring the inner diameter of the measurement hole by bringing a contactor into contact with an inner diameter surface of the measurement hole of the workpiece held by the chuck device; Including, The inner diameter measurement method further includes inserting the contact into the measurement hole when the workpiece is held by the chuck device.

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