Inspection device, inspection method, and method for manufacturing disc brake plate

Abstract

To provide an inspection device capable of inspecting the center of gravity of a tabular inspection object and capable of detecting the moment that is acting and the center of gravity coordinate.SOLUTION: An inspection device (1) is an inspection device for inspecting the center of gravity of a tabular inspection object (400). The inspection device (1) comprises: a support part (10) that supports the inspection object (400) by a top end (101); and a force sensor (20) fastened to a lower end (102) of the support part (10), which detects a force in the direction of gravity acting on the support part (10) from the inspection object (400) in a non-rotating state and a moment around an axis orthogonal to the direction of gravity.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an inspection device and an inspection method for inspecting the center of gravity of a plate-shaped inspection object, and a manufacturing method of a disc brake plate. [Background technology]

[0002] There is known a brake disc mounting state inspection device that inspects whether or not a brake disc is fixed perpendicularly to an axle. For example, the brake disc mounting state inspection device disclosed in Patent Document 1 includes a fixing means that is detachably fixed to a bolt or nut fastened to a non-rotating part that rotatably supports the brake disc, a brake disc contact member made of an elastic body that can abut against a side surface of the brake disc, a connecting means that supports the brake disc contact member on the fixing means so that the position can be adjusted, a strain gauge provided on a flexible part of the brake disc contact member, and a mounting state determination means that determines the mounting state of the brake disc based on the output of the strain gauge.

[0003] By the way, there is a known technique for measuring the center of gravity of a plate-shaped manufactured product such as a brake disk and inspecting whether the measured center of gravity position coincides with the center of gravity position of a normal product. A static balance inspection machine is known as a type of inspection device capable of performing such inspection. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-323352 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional static balance testers do not know the applied moments and center of gravity coordinates.

[0006] One aspect of the present invention aims to provide an inspection device, an inspection method, and a manufacturing method for a disc brake plate that are capable of inspecting the center of gravity of a plate-shaped inspection object and detecting the applied moment and center of gravity coordinates. [Means for solving the problem]

[0007] In order to solve the above problems, an inspection device according to one embodiment of the present invention is an inspection device for inspecting the center of gravity of a plate-shaped inspection object, and includes a support part that supports the inspection object at an upper end, and a force sensor fastened to the lower end of the support part, which detects a force in the direction of gravity acting on the support part from the inspection object in a non-rotating state, and a moment around an axis perpendicular to the direction of gravity.

[0008] In order to solve the above problems, an inspection method according to one embodiment of the present invention is an inspection method for inspecting the center of gravity of a plate-shaped inspection object using the above-mentioned inspection device, and includes a supporting step of supporting the inspection object on the upper end of the support part, and a detection step of detecting, by the force sensor, a force in the direction of gravity acting on the support part from the inspection object supported by the supporting step, and a moment around an axis perpendicular to the direction of gravity.

[0009] In order to solve the above problems, a manufacturing method of a disc brake plate according to one embodiment of the present invention includes a turning process for turning a plate-shaped inspection object that serves as a base material for the disc brake plate, and an inspection process for inspecting the center of gravity of the plate-shaped inspection object turned by the turning process using the above-mentioned inspection device. Effect of the Invention

[0010] According to one aspect of the present invention, it is possible to realize an inspection device, an inspection method, and a manufacturing method for a disc brake plate that are capable of inspecting the center of gravity of a plate-shaped inspection object and detecting the applied moment and center of gravity coordinates. [Brief description of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of an inspection device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a configuration of the inspection device shown in FIG. [Diagram 3] 2 is a perspective view of a force sensor provided in the inspection device shown in FIG. 1. [Figure 4] 2 shows an example of a screen display showing the inspection results of the inspection device shown in FIG. 1 . [Diagram 5] FIG. 2 is a flow diagram illustrating the process steps of an inspection method according to an embodiment of the present invention. [Figure 6] FIG. 2 is a flow diagram illustrating the process steps of a manufacturing method according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Inspection equipment configuration> An inspection device 1 according to an embodiment of the present invention will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a cross-sectional view of the inspection device 1. Fig. 2 is a block diagram showing the configuration of the inspection device 1. For convenience of explanation, Fig. 1 shows a cross-sectional view of a portion of the configuration.

[0013] The inspection device 1 is an inspection device that inspects the center of gravity of a plate-shaped inspection object 400. Here, the inspection object 400 is, as an example, a disk-shaped casting having a draft angle after turning, which is the base material of a disk brake plate. The inspection object 400 can also be said to be a disk brake plate that has been turned. However, the inspection object 400 is not limited to a disk brake plate that has been turned. For example, a disk-shaped structure, a planar rectangular structure, etc. can be the inspection object 400. These plate-shaped inspection objects do not have to be symmetrical.

[0014] The inspection device 1 includes a support 10 and a force sensor 20. The support 10 is a columnar structure having a central axis in the vertical direction. In this embodiment, the vertical direction is defined as the Z-axis. The drawings also show an XYZ three-dimensional coordinate system in which a plane perpendicular to the Z-axis is defined as the XY plane, and the X-axis and Y-axis directions are defined.

[0015] The support portion 10 includes an upper end portion 101 located at the tip end on the positive side of the Z axis, a lower end portion 102 corresponding to the end end on the negative side of the Z axis, and an intermediate portion 103 connecting the upper end portion 101 and the lower end portion 102. An inspection object 400 is placed on the upper end portion 101. When the inspection object 400 is a disc brake plate that has been subjected to the above-mentioned lathe machining, the upper end portion 101 is configured to fit into a recess (fitted portion 401 in FIG. 1) having a draft angle provided in the center portion of the disc brake plate. The upper end portion 101 has a structure having a tapered tip so that it can be satisfactorily fitted into the fitted portion of each inspection object even if the type of the inspection object is changed. The upper end portion 101 supports the inspection object 400 in this manner.

[0016] The intermediate portion 103 is a columnar body with a small diameter, with the upper end portion 101 fixed to one end and the lower end portion 102 fixed to the other end. There is no particular limit to the small diameter as long as it is smaller than the diameter of the object to be inspected. There is also no particular limit to the length in the Z-axis direction as long as it is long enough to realize a state in which the object to be inspected is supported only by the upper end portion 101.

[0017] The lower end 102 constitutes the end of the support part 10 on the negative Z-axis direction side. The force sensor 20 is fastened to the lower surface (surface facing the negative Z-axis direction) of the lower end 102. The lower end 102 has a flange portion that protrudes in the radially expanding direction beyond the outer circumferential surface of the intermediate part 103. In other words, the lower end 102 has a flange shape and protrudes in the radially expanding direction beyond the outer circumferential surface of the intermediate part 103. Because the lower end 102 (flange portion) protrudes in the radially expanding direction, a wide connection area with the force sensor 20 can be secured.

[0018] The force sensor 20 is fastened to the lower end 102 of the support part 10, and detects the force in the direction of gravity acting on the support part 10 from the inspection object 400 in a non-rotating state, and the moment around an axis perpendicular to the direction of gravity. The force sensor 20 is a six-axis force sensor, but may be a three-axis force sensor. The force sensor 20, which is a six-axis force sensor, will be described below with reference to FIG. 3.

[0019] FIG. 3 is a perspective view of the force sensor 20, which is a six-axis force sensor. As shown in FIG. 4, the force sensor 20 includes a strain sensor 11 and a group of six strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2. The six-axis force sensor is a force sensor capable of detecting the X-axis component, the Y-axis component, the Z-axis component, the moment component around the X-axis, the moment component around the Y-axis, and the moment component around the Z-axis of an external force. The strain sensor 11 is disposed so that its two main surfaces are parallel to the XY plane. Of the pair of main surfaces of the strain sensor 11, one of the main surfaces on the negative Z-axis side is called the main surface 11a, and the other main surface on the negative Z-axis side is called the main surface 11b.

[0020] The force sensor 20 is an example, and may be another existing force sensor. For example, the configuration of the force sensor may be applied to the force sensor described in Figures 1 and 2 of Japanese Patent Application No. 2019-068598.

[0021] In addition, the force sensor 20 includes a plurality of resistance elements and a plurality of bridge circuits in addition to the strain body 11 and the strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2. However, in this embodiment, the strain body 11 and the strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2 will be described, and the description of the plurality of resistance elements and the plurality of bridge circuits will be omitted. The configuration of the plurality of resistance elements and the plurality of bridge circuits can be applied to the configuration of an existing force sensor (for example, the force sensor described in FIG. 1 and FIG. 2 of Japanese Patent Application No. 2019-068598).

[0022] The flexure body 11 is a plate-like member made of a material having spring properties. As shown in Fig. 3, the flexure body 11 includes a core portion 111, a frame portion 112 surrounding the core portion 111, and arm portions 113a to 113c connecting the core portion 111 and the frame portion 112. Examples of materials for the flexure body 11 include conductors such as aluminum alloys, alloy steels, and stainless steels, and dielectrics such as ceramics, resins, and glass. In this embodiment, the flexure body 11 is made of ceramics, which is an example of a dielectric material.

[0023] Moreover, as a method for processing the strain body 11, a substrate that is a single plate-like member with a uniform thickness may be machined. One example of the machining is cutting. For cutting, NC (Numerical Control) processing may be suitably used. When an external force acts on the core portion 111 with the frame portion 112 fixed, distortion corresponding to the external force is generated in the arm portions 113a to 113c. For this reason, the core portion 111 may be called the "force receiving portion" and the frame portion 112 may be called the "fixed portion."

[0024] In the force sensor 20, one of the pair of principal surfaces of the strain body 11, that is, the principal surface 11a on the Z-axis positive side, faces the lower surface of the lower end portion 102 (flange portion) of the support portion 10 shown in FIG. 1, and the lower surface and the core portion 111 are fastened to each other. The lower end portion 102 (flange portion) of the support portion 10 has a size that allows the lower end portion 102 (flange portion) to be fastened to the core portion 111. The central axis of the intermediate portion 103 of the support portion 10 is located above the central point of the strain body 11. With this configuration, the force sensor 20 is configured such that an external force, that is, a force acting on the support portion 10 from the inspection object 400 in a non-rotating state, acts on the core portion 111. The force sensor 20 detects the Z-axis component of this force. This corresponds to the "force in the gravity direction acting on the support portion 10 from the inspection object 400 in a non-rotating state." Furthermore, the force sensor 20 detects the moment component of this force about the X-axis and the moment component about the Y-axis. This corresponds to the "moment about an axis perpendicular to the direction of gravity."

[0025] The shape of the core portion 111 is not particularly limited, but in this embodiment, the shape of the core portion 111 is a column shape with a substantially triangular bottom (i.e., a substantially triangular column shape). The shape of the frame portion 112 is not particularly limited, but in this embodiment, the shape of the frame portion 112 is a ring shape. The outer peripheral portion and the inner peripheral portion of the frame portion 112 are both substantially circular and are configured to be concentric with each other. As described above, the strain body 11 is formed by processing one base material having a uniform thickness. Therefore, the thickness of the core portion 111 and the thickness of the frame portion 112 are substantially equal (equal in this embodiment). The core portion 111 is accommodated inside the inner peripheral portion of the frame portion 112 so that the center of the ring-shaped frame portion 112 and the center of gravity of the core portion 111 coincide with each other.

[0026] In this embodiment, the arm portions 113a to 113c have a shape of a column (i.e., a substantially rectangular column shape) that has a substantially rectangular cross section and extends in one direction. The number of the arm portions 113a to 113c is not particularly limited, but in this embodiment, the number of the arm portions 113a to 113c is three. The arm portion 113a extends from the core portion 111 in the negative Y-axis direction and connects the core portion 111 to the frame portion 112. The arm portion 113b extends in the direction of -120° (120° clockwise) from the negative Y-axis direction in the XY plane and connects the core portion 111 to the frame portion 112. The arm portion 113c extends from the core portion 111 in the direction of +120° (120° counterclockwise) from the negative Y-axis direction in the XY plane and connects the core portion 111 to the frame portion 112.

[0027] However, the shapes of the core portion 111, the frame portion 112, and the arms 113a to 113c are not limited to the above shapes. For example, the core portion 111, the frame portion 112, and the arms 113a to 113c may have a shape as shown in FIG. 1 of Japanese Patent Application No. 2019-068598.

[0028] As shown in FIG. 2, the inspection device 1 further includes a control unit 30 (identification unit) capable of controlling each component. The control unit 30 acquires an output signal from the force sensor 20. The control unit 30 acquires a signal indicating a force in the gravity direction (negative direction of the Z axis) acting on the support unit 10 from the inspection object 400 in a non-rotating state and a moment around an axis perpendicular to the gravity direction, which are detected by the force sensor 20. The control unit 30 then identifies the center of gravity of the inspection object 400. The fact that the force sensor 20 detects a moment component around the X axis and a moment component around the Y axis means that the center of gravity is shifted. Therefore, since the weight can be calculated from the above-mentioned Z axis direction component, the control unit 30 can determine the position shifted from the center position, that is, the center of gravity position, by dividing the value of the moment component around the X axis (or the moment component around the Y axis) by the weight.

[0029] The control unit 30 further specifies whether or not the identified center of gravity is at the position of the center of gravity that the inspection object 400 should have. To this end, the control unit 30 uses information on the position of the center of gravity that the inspection object 400 should have and information on the center of gravity identified based on the output signal of the force sensor 20. That is, information on the inspection object 400 is registered or input in advance to the control unit 30, and the control unit 30 acquires information on the center of gravity that the inspection object 400 should have, for example, via a server. Note that the information on the center of gravity that the inspection object 400 should have may be held by the control unit 30 itself.

[0030] Here, the information regarding the center of gravity that the inspection target 400 should have is information indicating the position coordinates of the center of gravity that the inspection target 400 should have. Note that the position coordinates of the center of gravity that the inspection target 400 should have may include coordinates indicating a predetermined allowable range when the position of the center of gravity that the inspection target 400 should have is within the range.

[0031] The control unit 30 compares the position coordinates of the center of gravity identified based on the output signal of the force sensor 20 (hereinafter, this may be referred to as the "identified center of gravity") with the position coordinates of the center of gravity that the inspection target 400 should have (hereinafter, this may be referred to as the "center of gravity of a normal product"). Then, the control unit 30 identifies whether the identified center of gravity is located at the center of gravity of a normal product (whether it is located within an allowable range that can be considered as a normal product). One of the reasons why the identified center of gravity is located at a position coordinate different from the center of gravity of a normal product may be a structural defect of the inspection target 400 itself. Examples of structural defects of the inspection target 400 itself include deformation or chipping, as well as defects associated with casting or defects in the turning process when the inspection target 400 is a disk-shaped casting that has been turned and is to be the base material of a disc brake plate.

[0032] Here, based on the identified coordinates of the center of gravity and the coordinates of the center of gravity of the normal product, the control unit 30 also identifies the argument (unit: deg) when the position of the center of gravity of the inspection target object 400 is expressed in polar coordinates with the position of the center of gravity of the normal product as the origin, and the moment (unit: Ncm) around an axis perpendicular to the direction of gravity. Note that the control unit may identify at least one of these.

[0033] As shown in Fig. 2, the inspection device 1 includes an output unit 40 that outputs the result identified by the control unit 30. The output unit 40 outputs the result identified by the control unit 30, that is, information indicating whether or not the identified center of gravity is a center of gravity of a normal product (a center of gravity located within an allowable range). When the output unit 40 includes a display device, there may be a mode in which an image showing the identified center of gravity and an image showing the center of gravity of a normal product (a center of gravity located within an allowable range) are combined with an image showing a schematic plan view of the inspection target 400 on the display screen of the display device. This will be described with reference to Fig. 4.

[0034] FIG. 4 is an example of an image 500 displayed on a display screen of a display device included in the output unit 40. The image 500 includes an image 501 that shows a schematic plan view of the inspection target 400, an image 502 that shows the identified center of gravity, an image 503 that shows the center of gravity of a normal product, and an image 504 that shows the allowable range of the center of gravity. The right side of the image 500 also includes an image 505 that shows the position coordinates of the identified center of gravity described above, the deflection angle (θ shown in FIG. 4 for convenience of explanation), and the calculated value of the moment (unit: Ncm). In this way, by having a function of displaying and notifying, a worker at the inspection site or the manufacturing site that manufactures the inspection target can know the center of gravity of the inspection target 400 and can know whether the inspection target is a normal product (a product or a structure that is a base material of the product).

[0035] In addition to the above-mentioned images 501 to 505, the image 500 in FIG. 4 may display the measurement data by the force sensor 20 as an image in the form of a graph, for example. In addition, instead of the above-mentioned images 501 to 505, the image 500 in FIG. 4 may display a determination result of whether or not the inspection object 400 is a normal product having a center of gravity (center of gravity within an allowable range) that a normal product has. For example, if the inspection object 400 is a normal product, the word "OK" may be displayed, and if the inspection object 400 is not a normal product, the word "NG" may be displayed. The above-mentioned display device may be installed not only at the lathe work site, but also in a control room away from the lathe work site.

[0036] As described above, according to the inspection device 1 of this embodiment, the force sensor 20 fastened to the lower end 102 of the support part 10 can detect the force in the direction of gravity acting on the support part 10 from the plate-like inspection object 400 in a non-rotating state, and the moment around an axis perpendicular to the direction of gravity. This makes it possible to statically identify the position of the center of gravity of the inspection object 400. In other words, the inspection device 1 of this embodiment is a static balance inspection device. Furthermore, according to the above-mentioned configuration, it is possible to identify whether or not there is a deviation from the position of the center of gravity of a normal product, and therefore it is possible to identify whether or not the inspection object 400 is a normal product.

[0037] Furthermore, according to the inspection device 1 of this embodiment, the position of the center of gravity of the object to be inspected can be statically identified using one force sensor 20, making control simple and enabling calibration to be performed in a short time.

[0038] As described above, the lower end 102 of the support part 10 has a flange part that protrudes in the radial direction beyond the outer circumferential surface of the intermediate part 103. This makes it easier for the force sensor to detect the force in the direction of gravity acting on the support part from the inspection object and the moment around the axis perpendicular to the direction of gravity.

[0039] The inspection device 1 is also capable of measuring the weight of the inspection target 400 supported by the support portion 10 using the force sensor 20.

[0040] <Testing method> 5 is a flow diagram showing the process of an inspection method for inspecting the center of gravity of a plate-shaped inspection object using the inspection device 1 of the present embodiment 1. The inspection method (S10) includes a supporting step (S11) and a detecting step (S12).

[0041] The supporting step S11 is a step of supporting the inspection target 400 on the upper end portion 101 of the support portion 10.

[0042] In the detection step S12, the force in the direction of gravity acting on the support 10 from the inspection object 400 supported on the upper end portion 101 in the supporting step S11 and the moment around an axis perpendicular to the direction of gravity are detected by the force sensor 20.

[0043] In the detection step S12, the force in the direction of gravity acting from the inspection object 400 to the support part 10 and the moment around an axis perpendicular to the direction of gravity are detected by the force sensor 20, so that the center of gravity of the inspection object 400 can be identified. Detection by the force sensor 20 has been described above, but in the detection step S12, the Z-axis direction component of the force in the pressing direction detected by the force sensor 20, the moment component around the X-axis, and the moment component around the Y-axis are detected, and these detection results are acquired as output signals by the control part 30, and the control part 30 identifies at least one of the position coordinates of the center of gravity of the inspection object 400, the above-mentioned deflection angle, and the moment of the inspection object. This makes it possible to inspect the center of gravity of the inspection object 400.

[0044] The detection step S12 may include a step of reporting by the output unit 40 (FIG. 2) described above.

[0045] According to the above-described inspection method S10, the position of the center of gravity of the inspection object can be identified by detection by the force sensor 20. This makes it possible to identify whether or not there is a deviation from the center of gravity position of a normal product, and therefore to identify whether or not the inspection object is a normal product.

[0046] <Product manufacturing method> In the above-mentioned inspection method, a turning process for turning a plate-shaped inspection object that is the base material of a product (e.g., a disc brake plate) and an inspection process for inspecting the center of gravity of the plate-shaped inspection object after the turning process can be incorporated into a manufacturing method of the product. Hereinafter, one embodiment of the manufacturing method of the product will be described with reference to FIG. 6. FIG. 6 is a flow diagram showing the steps of the manufacturing method of the product in this embodiment. As shown in FIG. 6, the manufacturing method of the product (S20) includes an inspection process (S21), a determination process (S22), and a subsequent processing process (S23).

[0047] The inspection step S21 includes the supporting step S11 and the detection step S12 in Fig. 5. Note that a turning process step of turning a plate-shaped inspection object may be included as a pre-step of the inspection step S21 (supporting step S11).

[0048] In the determination step S22, it is determined whether or not the center of gravity of the inspection object 400 identified based on the force in the gravity direction acting on the support unit 10 from the inspection object 400 detected by the force sensor 20 in the detection step S12 and the moment about an axis perpendicular to the gravity direction is within an allowable range. The determination step S22 is performed by the control unit 30 described above. If the result of the determination is that the center of gravity of the inspection object 400 is within the allowable range, proceed to YES in Fig. 6 and perform the subsequent processing step (S23). Here, if the inspection object 400 is a turned disc brake plate that is to be the base material of the disc brake plate, shipping is performed as an example.

[0049] On the other hand, if the result of the determination is that the identified center of gravity of the inspection object 400 is outside the allowable range, the process proceeds to NO in FIG. 6, and the subsequent processing steps are not performed.

[0050] According to the above manufacturing method S20, it is possible to identify the object 400 to be inspected whose center of gravity is located at the center of gravity position of a normal product, and only the identified object 400 to be inspected can be transferred to the subsequent processing step. This contributes to the manufacturing of products with high accuracy. Such an effect also contributes to the achievement of, for example, Goal 9 of the Sustainable Development Goals (SDGs) advocated by the United Nations, "Build resilient infrastructure and promote innovation (infrastructure, systems, etc.)."

[0051] 〔summary〕 An inspection device according to a first aspect of the present invention is an inspection device for inspecting the center of gravity of a plate-shaped inspection object, and comprises a support part that supports the inspection object at its upper end, and a force sensor fastened to the lower end of the support part, which detects a force in the direction of gravity acting on the support part from the inspection object in a non-rotating state, and a moment around an axis perpendicular to the direction of gravity.

[0052] According to the first aspect, the position of the center of gravity of the inspection object can be statically identified by detection using the force sensor, which makes it possible to identify whether the center of gravity is displaced from the position of the center of gravity of a normal product, and therefore to identify whether the inspection object is a normal product.

[0053] An inspection device according to a second aspect of the present invention, in addition to the configuration of the inspection device according to the first aspect described above, further comprises an identification unit that identifies at least one of the position of the center of gravity of the inspection object, the deflection angle when the position of the center of gravity of the inspection object is expressed in polar coordinates with the position of the center of gravity of a normal product as the origin, and the moment around an axis perpendicular to the direction of gravity, based on the detection results detected by the force sensor.

[0054] According to the second aspect, by having a specifying part, it is possible to know whether the inspection object is a normal product or not.

[0055] An inspection device according to a third aspect of the present invention has the same configuration as the inspection device according to the first or second aspect described above, and further, the object to be inspected may be disk-shaped.

[0056] An inspection method according to a fourth aspect of the present invention is an inspection method for inspecting the center of gravity of a plate-shaped inspection object using an inspection device described in any one of the first to third aspects, and includes a supporting step of supporting the inspection object on the upper end of the support part, and a detection step of detecting, by the force sensor, a force in the direction of gravity acting on the support part from the inspection object supported by the supporting step, and a moment around an axis perpendicular to the direction of gravity.

[0057] According to the fourth aspect, the position of the center of gravity of the inspection object can be identified by detection using the force sensor, which makes it possible to identify whether the center of gravity of the inspection object is displaced from that of a normal product, and therefore to identify whether the inspection object is a normal product.

[0058] A method for manufacturing a disc brake plate according to a fifth aspect of the present invention includes a turning process for turning a plate-shaped inspection object that serves as a base material for the disc brake plate, and an inspection process for inspecting the center of gravity of the inspection object turned by the turning process using an inspection device described in any one of the first to third aspects.

[0059] According to the fifth aspect, the inspection step makes it possible to specify a plate-shaped inspection object whose center of gravity is located at the center of gravity position of a normal product, thereby making it possible to manufacture a desired disc brake plate.

[0060] [Additional Notes] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0061] 1: inspection device, 10: support part, 20: force sensor, 30: control part, 40: output part, 101: upper end part, 103: middle part, 400: inspection object

Claims

1. An inspection device for inspecting the center of gravity of a plate-shaped inspection object, comprising: A support portion that supports the inspection object at an upper end portion; a force sensor fastened to a lower end of the support portion, the force sensor detecting a force in a gravity direction acting on the support portion from the inspection object in a non-rotating state and a moment about an axis perpendicular to the gravity direction; Equipped with Inspection equipment.

2. Based on the detection result detected by the force sensor, the position of the center of gravity of the inspection object; The deviation angle when the position of the center of gravity of the inspection object is expressed in polar coordinates with the position of the center of gravity of a normal product as the origin, and Moment around an axis perpendicular to the direction of gravity Further comprising a determination unit for determining at least one of the following:

2. The inspection device according to claim 1.

3. The test object is disc-shaped.

3. The inspection device according to claim 1 or 2.

4. 2. An inspection method for inspecting a center of gravity of a plate-shaped inspection object using the inspection device according to claim 1, comprising the steps of: a supporting step of supporting the inspection object on the upper end of the support part; a detection step of detecting, by the force sensor, a force in the direction of gravity acting on the support part from the inspection object supported by the supporting step and a moment around an axis perpendicular to the direction of gravity; Including, Testing method.

5. a turning process for turning a plate-shaped inspection object that is a base material for a disc brake plate; an inspection step of inspecting the center of gravity of the inspection object after the turning step by using the inspection device according to claim 1; Including, A method for manufacturing a disc brake plate.

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