Inspection system and inspection method

Abstract

The present invention provides an inspection system and inspection method that can easily and quickly inspect all items being inspected without destroying them. [Solution] The inspection system 1 of this disclosure is an inspection system for inspecting whether there are any defects in the joining of a workpiece 100, which has a nozzle portion 110 (opening) and an internal space, and further has a first joining portion 120 (joint) in which parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other. The inspection system 1 comprises a compressor 10 (pressurizing means) that pressurizes the internal space of the workpiece 100 by introducing fluid into the internal space of the workpiece 100 through the nozzle portion 110, connecting members 21 and 22 that connect the compressor 10 and the nozzle portion 110 of the workpiece 100, and a contact-type displacement sensor that detects whether there is a change in the thickness direction of the first joining portion 120 in response to the pressurization of the internal space of the workpiece 100 by the compressor 10.

Description

Technical Field

[0001] The present disclosure relates to an inspection system and an inspection method.

Background Art

[0002] There is known an inspection method for spot welds that can nondestructively and accurately quantitatively grasp internal cracks in spot welds by an inspection method using X-ray CT scanning (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the inspection by X-ray CT scanning, it takes time to inspect each inspection target, making it difficult to inspect many inspection targets, and also incurring a great cost for maintaining and operating the inspection equipment. Therefore, a method that can easily inspect welding defects (joint defects) of inspection targets is desired. [[ID=3,7]]

[0005] The present disclosure has been made to solve such problems, and an object thereof is to provide an inspection system and an inspection method that can easily perform inspections on all inspection targets in a short time without destroying the inspection targets.

Means for Solving the Problems

[0006] The inspection system of the present disclosure is [[ID=<<47>>]] an inspection system for inspecting the presence or absence of joint defects of an inspection target having an opening and an internal space, and further having a joint portion in which a part of the surfaces facing each other in the thickness direction of the internal space are joined to each other, A pressurizing means for pressurizing the internal space of the object to be inspected by introducing fluid into the internal space through the opening, A connecting member that connects the pressurizing means and the opening of the object to be inspected, Displacement detection means for detecting whether or not there is a change in the thickness direction of the joint in response to the pressure applied to the internal space of the object to be inspected by the pressurizing means, It is equipped with these features.

[0007] The inspection method described in this disclosure is: An inspection method for inspecting whether there are any defects in the joints of an object to be inspected, which has an opening and an internal space, and further has joints where parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other, The inspection target is placed on a plate-shaped jig in a placement step, A pressurizing step involves introducing fluid into the internal space of the object to be inspected through the opening, thereby pressurizing the internal space. A displacement measurement step that detects whether or not there is a change in the thickness direction of the joint in response to the pressure applied to the internal space of the object to be inspected in the pressurizing step, It includes. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide an inspection system and inspection method that can easily and quickly inspect all of the objects to be inspected without destroying them. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram illustrating the subject of the examination in this disclosure. [Figure 2] This diagram illustrates the method for preparing the test object shown in Figure 1. [Figure 3] This is a diagram showing the configuration of the inspection system according to Embodiment 1. [Figure 4] This is a cross-sectional view showing an example of inspection results obtained by the inspection system according to Embodiment 1. [Figure 5] This is a diagram showing the configuration of the inspection system according to Embodiment 2. [Figure 6] This is a cross-sectional view showing an example of inspection results obtained by the inspection system according to Embodiment 2. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. However, the invention claimed is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential for solving the problem. For clarity of explanation, the following descriptions and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are denoted by the same reference numerals, and redundant explanations have been omitted where necessary.

[0011] The inspection system and inspection method described herein will be explained below with reference to the drawings. First, the object to be inspected by the inspection system and inspection method of this disclosure (hereinafter also referred to as "inspection target" or "workpiece") will be explained with reference to Figures 1 and 2. Figure 1 is a diagram illustrating the inspection target (workpiece) of this disclosure. Figure 2 is a diagram illustrating the method for manufacturing the inspection target shown in Figure 1.

[0012] The workpiece 100, which is the object of inspection in the inspection system of this disclosure, is a bag-shaped object (a bag-shaped part) having an internal space inside and is equipped with a joint. As shown in Figure 1, the workpiece 100 is equipped with two mouth portions 110, a first joint portion 120, and a second joint portion 130. The mouth portions 110 serve as inlets for introducing fluid into the internal space when inspecting for the presence or absence of joint defects in the inspection system and inspection method described later. In this way, the internal space of the workpiece 100 can become a flow path.

[0013] The first joint portion 120 is a joint portion where a part of the surfaces facing each other in the thickness direction of the internal space of the workpiece 100 are partially joined to each other. The inspection system and inspection method of the present disclosure inspect the presence or absence of a defective joint (in the case where the joint is by welding, a defective weld) in this first joint portion 120.

[0014] The second joint portion 130 is an outer peripheral (peripheral) portion of the bag-shaped object that is joined to form a bag-shaped object during the production of the inspection target to be described later using FIG. 2. Note that the workpiece 100 may be in any form as long as it is a bag-shaped object. For example, the workpiece 100 may be in a form of integral molding by machining or the like. In this case, the workpiece 100 will not have the second joint portion 130.

[0015] Here, for example, in order to inspect the presence or absence of a defective joint in the second joint portion 130 of the workpiece 100, it is common to perform a leak test in which a liquid (for example, water) is put into the internal space and it is inspected whether there is leakage from the second joint portion 130. However, in the workpiece 100 having a joint portion (here, the first joint portion 120) inside rather than on the outer peripheral portion, even if there is a defective joint in the first joint portion 120, the liquid will not leak to the outside of the workpiece 100. Therefore, in such a workpiece 100, it is not possible to determine the presence or absence of a defective joint by a leak test.

[0016] For such reasons, for a workpiece having a joint portion inside a bag-shaped object, a destructive test in which the workpiece is actually broken to inspect whether the joint portion is firmly joined or an inspection by X-ray CT scan as described in Patent Document 1 has been used.

[0017] However, in the destructive test, there is a problem that it is not possible to inspect all of the workpieces 100, and in the inspection by X-ray CT scan, although all inspection is possible, there are problems that the equipment cost is high and the determination takes time. Hereinafter, an inspection system and inspection method that can solve such problems will be described.

[0018] The workpiece 100 shown in Figure 1 may also be manufactured using the manufacturing method shown in Figure 2. In this manufacturing method, first, two members, namely the upper member 101 and the lower member 102, are overlapped so as to form a bag-shaped internal space, and the outer periphery of these members is welded to form the second joint 130. Then, the recessed portion inside the bag-shaped object is welded to form the first joint 120. In this way, the workpiece 100 shown in Figure 1 may be manufactured.

[0019] (Embodiment 1) The inspection system and inspection method according to Embodiment 1 will be described below with reference to Figures 3 and 4.

[0020] <Configuration of the inspection system> First, the configuration of the inspection system according to this embodiment will be described. Figure 3 is a diagram showing the configuration of the inspection system according to Embodiment 1. The inspection system 1 of this embodiment is a system for inspecting whether or not there are any defects in the first joint portion 120 of the workpiece 100 described above. As shown in Figure 3, the inspection system 1 includes a compressor 10 as a pressurizing means, connecting members 21 and 22, and a contact-type displacement sensor 30 as a displacement detection means.

[0021] The compressor 10 is a device that takes in air, compresses it, and flows the compressed air into the internal space of the workpiece 100 through the connecting members 21 and 22 and the nozzle portion 110 of the workpiece 100. In this way, the compressor 10 pressurizes the internal space of the workpiece 100. The air pressure from the compressor 10 is not particularly limited, but should be adjusted appropriately according to the shape of the workpiece 100, etc., so that the inspection can be performed. Note that the pressurizing means in this disclosure is not limited to the compressor 10, as long as it can pressurize the internal space of the workpiece 100 to an appropriate pressure.

[0022] As described above, the connecting members 21 and 22 are members for connecting the compressor 10 and the nozzle portion 110 of the workpiece 100, and their tips are configured to be connectable to the nozzle portion 110 of the workpiece 100. Each connecting member 21 and 22 includes, for example, a pressure-resistant hose or an O-ring.

[0023] The contact-type displacement sensor 30 is a sensor that detects whether or not there is a change in the thickness direction of the first joint 120 in response to the pressure applied to the internal space of the workpiece 100 by the compressor 10. When the internal space of a workpiece 100 with a joint defect near the first joint 120 is pressurized by the compressor 10, the joint of the first joint 120 may peel off, and the two surfaces of the workpiece 100 may change (displace) in a direction that separates them. During inspection for joint defects, the contact-type displacement sensor 30 is in contact with the surface of the first joint 120, so it can detect such displacement of the first joint 120.

[0024] Furthermore, the displacement detection means is not limited to a contact-type displacement sensor 30, as long as it can detect the displacement of the first joint 120. For example, it may be composed of a laser displacement meter that uses laser light. In this case, the laser displacement meter will detect the amount of displacement of the first joint 120. The system can determine that there is a joint defect in the workpiece 100 by detecting a displacement amount that the laser displacement meter can detect, or by determining that this displacement amount is above a predetermined threshold.

[0025] Although not shown in the diagram, the inspection system 1 includes a determination means for determining whether or not there is a joint defect in the first joint 120 of the workpiece 100. The detection result from the contact-type displacement sensor 30 is output to the determination means, and the determination means can then determine whether or not there is a joint defect in the first joint 120 of the workpiece 100 based on the detection result.

[0026] Here, we illustrate the inspection results obtained by the inspection system 1 of this embodiment. Figure 4 is a cross-sectional view showing an example of the inspection results obtained by the inspection system 1 according to Embodiment 1. This cross-sectional view is a cross-sectional view cut along the cutting line IV-IV in Figure 1. Figure 4(a) shows the state before pressurization by the compressor 10. Figure 4(b) shows the state in which the first joint 120 has not been displaced (deformed) by pressurization by the compressor 10. In this way, if the joint of the first joint 120 is good, deformation of the first joint 120 will not occur, and the contact-type displacement sensor 30 will not detect any change in the thickness direction of the first joint 120.

[0027] On the other hand, Figure 4(c) shows an example of the state in which the first joint 120 is displaced (deformed) due to pressurization by the compressor 10. As shown in Figure 4(c), if the joint of the first joint 120 is faulty, the joint will peel off and the first joint 120 will deform by bulging outwards. The contact-type displacement sensor 30 will then detect the change in the thickness direction of the first joint 120.

[0028] A determination means (not shown) can determine whether the joint of the first joint 120 is good or bad based on whether there is a change in the thickness direction of the first joint 120, that is, based on the detection result of the contact-type displacement sensor 30.

[0029] <Operation of the inspection system> Next, the operation of the inspection system 1 according to this embodiment will be described. Note that the operation of the inspection system 1 will be briefly explained without illustration.

[0030] First, the workpiece 100 to be inspected is placed on a plate-shaped jig (not shown). Next, the internal space of the workpiece 100 is pressurized by introducing air into the internal space of the workpiece 100 through the connecting members 21, 22 and the nozzle portion 110 of the workpiece 100 using a compressor 10. Then, the presence or absence of a change (displacement) in the thickness direction of the first joint 120 is detected in response to the pressurization of the internal space of the workpiece 100. Finally, the presence or absence of a joint defect in the first joint 120 is determined based on the change in the thickness direction of the first joint 120.

[0031] As described above, the inspection system 1 according to this embodiment is an inspection system for inspecting whether there are any defects in the joining of a workpiece 100, which has a nozzle portion 110 (opening) and an internal space, and further has a first joint portion 120 (joint portion) in which parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other. This inspection system 1 includes a compressor 10 (pressurizing means) that pressurizes the internal space of the workpiece 100 by introducing air into the internal space of the workpiece 100 through the nozzle portion 110, connecting members 21 and 22 that connect the compressor 10 and the nozzle portion 110 of the workpiece 100, and a contact-type displacement sensor 30 (displacement detection means) that detects whether there is a change in the thickness direction of the first joint portion 120 in response to the pressurization of the internal space of the workpiece 100 by the compressor 10. By configuring the inspection system 1 according to this embodiment in this way, it is possible to easily and quickly inspect all of the workpieces 100 without damaging the workpieces 100, using a simple configuration and few components. According to the inspection system 1 of this embodiment, in particular, the inspection performed by the inspection system 1 can achieve a unique effect in that the accuracy of the inspection is improved when the thickness of the workpiece 100 is thin and the internal pressure during inspection is high.

[0032] Furthermore, the inspection method according to this embodiment is an inspection method for checking whether there are any defects in the joining of a workpiece 100, which has a mouth portion 110 (opening) and an internal space, and further has a first joining portion 120 (joint) in which parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other. This inspection method includes a placement step of placing the workpiece 100 on a plate-shaped jig, a pressurizing step of pressurizing the internal space of the workpiece 100 by introducing fluid into the internal space of the workpiece 100 through the mouth portion 110, and a displacement measuring step of detecting whether there is any change (displacement) in the thickness direction of the first joining portion 120 in response to the pressurization of the internal space of the workpiece 100 in the pressurizing step. By configuring the inspection method according to this embodiment in this way, the same effects as the inspection system 1 can be achieved.

[0033] (Embodiment 2) <Configuration of the inspection system> The inspection system and inspection method according to Embodiment 2 will be described below with reference to Figures 5 and 6.

[0034] <Configuration of the inspection system> First, the configuration of the inspection system according to this embodiment will be described. Figure 5 is a diagram showing the configuration of the inspection system according to Embodiment 2. The inspection system 2 of this embodiment is a system for inspecting whether or not there are any defects in the first joint portion 120 of the workpiece 100, similar to the inspection system 1. The inspection system 2 differs from the inspection system 1 of Embodiment 1 in that it is equipped with a hydraulic pump 40 and an ON / OFF switch 50 instead of a compressor 10 and a contact-type displacement sensor 30.

[0035] The hydraulic pump 40, as a pressurizing means, is a device that takes in water, compresses it, and causes the compressed water to flow into the internal space of the workpiece 100 through the connecting members 21, 22 and the nozzle portion 110 of the workpiece 100. In this way, the hydraulic pump 40 pressurizes the internal space of the workpiece 100. Note that the pressurizing means in this disclosure is not limited to the hydraulic pump 40, but may also be a hydraulic pump that introduces oil into the internal space of the workpiece 100.

[0036] The ON / OFF switch 50, used as a displacement detection means, is a switch that detects whether or not there is a change in the thickness direction of the first joint 120 in response to the pressurization of the internal space of the workpiece 100 by the hydraulic pump 40. When the internal space of a workpiece 100 with a joint defect near the first joint 120 is pressurized by the hydraulic pump 40, the joint of the first joint 120 peels apart, and the two surfaces of the workpiece 100 change (displace) in a direction that separates them. The ON / OFF switch 50 detects this displacement, turns on, and can detect the displacement of the first joint 120. In this way, by using the ON / OFF switch 50, the inspection result for joint defects can be easily obtained simply by turning the switch on or off.

[0037] Here, we will illustrate the inspection results obtained by the inspection system 2 of this embodiment. Figure 6 is a cross-sectional view showing an example of the inspection results obtained by the inspection system 2 according to Embodiment 2. This cross-sectional view, like Figure 4, is a cross-sectional view cut along the cutting line IV-IV in Figure 1. Figure 6(a) shows the state before pressurization by the hydraulic pump 40. Figure 6(b) shows an example of the state in which the first joint 120 is displaced (deformed) by pressurization by the hydraulic pump 40. In this way, if the joint of the first joint 120 is defective, the joint of the first joint 120 will peel off and deform to bulge outward, as shown in the example in Figure 6(b). Then, the ON / OFF switch 50 will be turned ON.

[0038] Similar to Embodiment 1, the determination means (not shown) can determine whether the joint of the first joint 120 is good or bad based on whether there is a change in the thickness direction of the first joint 120, that is, based on the detection result (state) of the ON / OFF switch 50.

[0039] Since the operation of inspection system 2 according to this embodiment is substantially the same as the operation of inspection system 1, a detailed explanation thereof will be omitted.

[0040] As described above, the inspection system 2 according to this embodiment is an inspection system for inspecting whether there are any defects in the joining of a workpiece 100, which has a nozzle portion 110 (opening) and an internal space, and further has a first joining portion 120 (joint) in which parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other. This inspection system 2 includes a hydraulic pump 40 (pressurizing means) that pressurizes the internal space of the workpiece 100 by introducing water into the internal space of the workpiece 100 through the nozzle portion 110, connecting members 21 and 22 that connect the hydraulic pump 40 and the nozzle portion 110 of the workpiece 100, and an ON / OFF switch 50 (displacement detection means) that detects whether there is a change in the thickness direction of the first joining portion 120 in response to the pressurization of the internal space of the workpiece 100 by the hydraulic pump 40. By configuring the inspection system 2 according to this embodiment in this way, the same effects as the inspection system 1 according to Embodiment 1 can be achieved.

[0041] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. In other words, the above description has been omitted and simplified as appropriate for the sake of clarity, and those skilled in the art can easily change, add, and modify each element of the embodiments within the scope of the present invention. [Explanation of Symbols]

[0042] 1, 2 Inspection Systems 10 Compressor (means of pressurization) 21, 22 Connecting members 30. Contact-type displacement sensor (displacement detection means) 40. Water pressure pump (means of pressurization) 50 ON / OFF switch (displacement detection means) 100 items to be inspected (workpieces) 110 Mouthpiece 120 1st joint 130 Second joint

Claims

1. An inspection system for inspecting whether there are any defects in the joints of an object to be inspected, which has an opening and an internal space, and further has joints where parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other, A pressurizing means for pressurizing the internal space of the object to be inspected by introducing fluid into the internal space through the opening, A connecting member that connects the pressurizing means and the opening of the object to be inspected, Displacement detection means for detecting whether or not there is a change in the thickness direction of the joint in response to the pressure applied to the internal space of the object to be inspected by the pressurizing means, Equipped with, Inspection system.

2. The pressurizing means consists of a compressor for introducing air, a water pump for introducing water, or a hydraulic pump for introducing oil. The inspection system according to claim 1.

3. The displacement detection means is a contact-type displacement sensor or a laser displacement meter. The system further includes a determination means for determining that there is a joint defect in the joint of the object being inspected, in response to the detection of a displacement of a predetermined value or more by the contact-type displacement sensor or the laser displacement meter. The inspection system according to claim 1 or 2.

4. The displacement detection means is an ON / OFF switch. The system further includes a determination means for determining whether there is a faulty joint in the joint to be inspected, in response to the ON / OFF switch being turned ON. The inspection system according to claim 1 or 2.

5. An inspection method for inspecting whether there are any defects in the joints of an object to be inspected, which has an opening and an internal space, and further has joints where parts of the surfaces facing each other in the thickness direction of the internal space are joined to each other, The inspection target is placed on a plate-shaped jig in a placement step, A pressurizing step involves introducing fluid into the internal space of the object to be inspected through the opening, thereby pressurizing the internal space. A displacement measurement step that detects whether or not there is a change in the thickness direction of the joint in response to the pressure applied to the internal space of the object to be inspected in the pressurizing step, including, Testing method.

Images