A device and method for detecting a tapered hole of an automobile door panel

Abstract

The application discloses a kind of automobile door sheet metal part conical hole detection device and detection method, belong to automobile technical field, including ontology, aperture gauge, gasket, detection block and sliding sleeve;The aperture gauge is installed in the mounting hole of the conical face end of ontology, and is fastened by screw plug, the sliding sleeve is sleeved from the other end of the conical face of ontology, and the anti-rotation pin fastens the sliding sleeve on ontology, sliding sleeve and ontology clearance fit, and sliding sleeve can slide along ontology axial direction, and the anti-rotation pin limits the rotation of sliding sleeve along ontology radial direction;The detection block is fixed in the non-conical face end of ontology, and the gasket structure is arranged between the detection block and the non-conical face end of ontology.In production process, door lock installation conical hole face size variation can be found in time, to avoid the quality problem of subsequent process caused by size change, reduce production process cost.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically relating to a device and method for detecting tapered holes in automotive door sheet metal parts. Background Technology

[0002] In automotive component design and manufacturing, the door assembly is a crucial component of the vehicle body assembly. The inner door panel serves both a vital function—installing door locks and power window systems—and a visual aesthetic function. In product structural design, many door lock mounting holes on the inner door panel utilize tapered holes to facilitate installation. To enhance the reliability of door lock installation, a reinforcing plate is added inside the inner door panel to prevent significant deformation during installation and use, which could lead to door malfunction. This necessitates that the shape and dimensions of the door lock area on the inner door panel conform to product design requirements and be effectively controlled during production. Typically, there are three tapered holes on the inner door panel arranged in a triangle. The forming depth and coaxiality of the tapered hole surfaces affect the stability of the door lock installation. In existing models, during the testing and mass production stages, substandard tapered hole depth and coaxiality frequently cause internal stress on the door lock mounting surface, resulting in localized paint cracking. This affects the door's appearance and, in severe cases, reduces the corrosion resistance of the door sheet metal, shortening the door's lifespan.

[0003] The tapered surface of the door lock mounting hole is a critical condition for door lock installation. Ensuring the tapered surface conforms to the product design precision is a key focus during mold debugging. During the process design phase, springback is considered during forming, and the tapered surface undergoes springback compensation. The degree of tapered hole forming is controlled by the fit between the punch and die and the sheet metal during mold debugging. However, in actual production, variations in sheet metal thickness, equipment worktable, and wear of the punch and die can lead to insufficient tapered hole forming, resulting in fluctuations in the depth and coaxiality of the tapered hole. Ultimately, this causes stress changes within the door lock mounting area, leading to quality problems. Currently, the control of the tapered hole dimensions still relies on mold precision and feedback from subsequent processes, lacking proactive identification methods.

[0004] Therefore, to enhance the control of actively identifying the dimensions of the conical hole surface, real-time detection of the conical hole surface dimensions is required to evaluate the forming degree of the conical hole in the actual sample. However, on the one hand, due to the influence of the product structure, the actual sample door lock mounting hole has a conical hole surface, which cannot be detected online in real time. It needs to be sent to the testing room for coordinate measuring machine (CMM) inspection after production. By the time the inspection results are available, the part has already been manufactured, and only a suitable judgment can be made, without the ability to predict and resolve issues beforehand. On the other hand, online real-time inspection lacks suitable inspection tools, making it impossible to accurately judge the forming degree of the conical hole surface.

[0005] Therefore, there is an urgent need to develop a method for detecting tapered holes in automotive door sheet metal parts. Summary of the Invention

[0006] To address the problem of the inability to detect the dimensions of the tapered hole surface for door lock installation on the inner panel of automotive doors in real time in existing technologies, this invention provides a tapered hole detection device and method for automotive door sheet metal parts. This solves the problem that real-time detection of the dimensions of the tapered hole surface for door lock on the inner panel of automotive doors is difficult to achieve on the production line due to the influence of the shape of the parts, requiring a matching measuring tool for the tapered hole surface.

[0007] This invention is achieved through the following technical solution:

[0008] A device for detecting tapered holes in automotive door sheet metal parts includes a body 1, a bore gauge 2, a gasket 3, a detection block 4, and a sliding sleeve 5. The bore gauge 2 is installed in a mounting hole at the tapered end of the body 1 and is secured by a screw plug 7. The sliding sleeve 5 is inserted from the other end of the tapered surface of the body 1, and an anti-rotation pin 9 secures the sliding sleeve 5 to the body 1. The sliding sleeve 5 has a clearance fit with the body 1 and can slide along the axial direction of the body 1. The anti-rotation pin 9 restricts the sliding sleeve from rotating radially along the body. The detection block 4 is fixed to the non-tapered end of the body 1, and a gasket structure 3 is provided between the detection block 4 and the non-tapered end of the body 1.

[0009] Furthermore, the body 1 is a rotating body composed of three stepped shafts and a conical surface. There is a round hole at the end of the conical surface. The stepped shaft surface connected to the conical surface is machined with a threaded hole for the screw plug 7 to pass through. A keyway is machined on the second stepped shaft for fastening the locking screw 8. A threaded hole is machined at 90° to the keyway for the anti-rotation pin 9 to pass through. A screw hole is machined at the end of the third stepped shaft for the fastening screw 6 to pass through.

[0010] Furthermore, the sliding sleeve 5 is provided with a limiting elongated hole, the anti-rotation pin 9 passes through the limiting elongated hole on the sliding sleeve 5 and is fastened to the body 1, and the anti-rotation pin 9 controls the sliding range of the sliding sleeve 5 through the limiting elongated hole on the sliding sleeve 5.

[0011] Furthermore, the detection block 4 and the gasket structure 3 are fixed to the non-conical end of the body 1 by fastening screws 6.

[0012] Furthermore, when the positioning end of the sliding sleeve 5 contacts the workpiece 10, the sliding sleeve 5 is fastened to the body 1 by the locking screw 8, so that the sliding sleeve 5 cannot slide along the axial direction of the body 1, thereby maintaining a stable and measurable distance between the measuring end face of the sliding sleeve 5 and the detection block 4.

[0013] Furthermore, the gasket structure 3 is composed of multiple gaskets. By adjusting the number of gasket structures 3, the initial B0 value can be kept as an integer to facilitate calculation.

[0014] On the other hand, the present invention also provides a detection method for a tapered hole detection device for automotive door sheet metal parts, specifically including the following steps:

[0015] a) Place the inner door panel to be inspected with the tapered hole facing upwards;

[0016] b) Loosen the locking screws of the detection device;

[0017] c) Place the conical surface of the main body against the conical hole surface of the inner panel of the door, and rotate the test block left and right by hand with the axis of the main body as the axis to ensure that the conical surface of the main body is completely against the conical hole surface of the inner panel of the door.

[0018] d) Slide the sliding sleeve up and down to make the end face of the sliding sleeve fully contact the plane around the tapered hole of the inner panel of the door, and tighten the locking screw to prevent the sliding sleeve from continuing to slide on the body.

[0019] e) Remove the testing device, use a vernier caliper to check the distance B between the lower end face of the testing block and the upper end face of the sliding sleeve, and record the value and the distance B0 of the gasket structure;

[0020] f) The difference between B and B0 is used as the depth deviation value of the tapered hole surface. The forming depth of the tapered hole in the mold is evaluated based on the deviation value.

[0021] Furthermore, a positive value of B-B0 indicates that the conical hole surface is deeper, while a negative value indicates that the conical hole surface is shallower. If the difference between B-B0 is within the specified range, the depth of the conical hole surface is qualified; otherwise, it is unqualified, and the forming depth of the conical hole in the mold needs to be adjusted.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] This invention provides a device and method for detecting tapered holes in automotive door sheet metal parts. During the production process, it can promptly detect changes in the dimensions of the tapered holes for door lock installation, preventing quality problems in subsequent processes caused by dimensional changes and reducing production costs. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the structure of a tapered hole detection device for automotive door sheet metal parts according to the present invention;

[0026] Figure 2This is an operational schematic diagram of a tapered hole detection device for automotive door sheet metal parts according to the present invention;

[0027] In the diagram: 1. Body, 2. Bore gauge, 3. Gasket structure, 4. Detection block, 5. Sliding sleeve, 6. Fastening screw, 7. Plug, 8. Locking screw, 9. Anti-rotation pin. Detailed Implementation

[0028] To clearly and completely describe the technical solution and its specific working process of the present invention, the specific embodiments of the present invention are as follows, in conjunction with the accompanying drawings:

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] Example 1

[0033] like Figure 1The diagram shows a schematic of a tapered hole detection device for automotive door sheet metal parts according to this embodiment. The detection device consists of a body 1, a bore gauge 2, a gasket structure 3, a detection block 4, a sliding sleeve 5, a fastening screw 6, a screw plug 7, a locking screw 8, and an anti-rotation pin 9. The bore gauge 2 is installed in the mounting hole at the tapered end of the body 1 and is fastened by the screw plug 7. The sliding sleeve 5 is inserted from the other end of the tapered surface of the body 1. The anti-rotation pin 9 fastens the sliding sleeve 5 to the body 1 with a clearance fit, and the sliding sleeve 5 can slide along the axial direction of the body 1. The anti-rotation pin 9 restricts the sliding sleeve from rotating radially along the body. The detection block 4 is fixed to the non-tapered end of the body 1, and a gasket structure 3 is provided between the detection block 4 and the non-tapered end of the body 1.

[0034] In this embodiment, the body 1 is a rotating body composed of three stepped shafts and a conical surface. There is a round hole at the end of the conical surface. The stepped shaft surface connected to the conical surface is machined with a threaded hole for the screw plug 7 to pass through. A keyway is machined on the second stepped shaft for fastening the locking screw 8. A threaded hole is machined at 90° to the keyway for the anti-rotation pin 9 to pass through. A screw hole is machined at the end of the third stepped shaft for the fastening screw 6 to pass through.

[0035] The sliding sleeve 5 is provided with a limiting elongated hole. The anti-rotation pin 9 passes through the limiting elongated hole on the sliding sleeve 5 and is fastened to the body 1. The anti-rotation pin 9 controls the sliding range of the sliding sleeve 5 through the limiting elongated hole on the sliding sleeve 5.

[0036] The detection block 4 and the gasket structure 3 are fixed to the non-conical end of the body 1 by fastening screws 6.

[0037] When the positioning end of the sliding sleeve 5 contacts the workpiece 10, the sliding sleeve 5 is fastened to the body 1 by the locking screw 8, so that the sliding sleeve 5 cannot slide along the axial direction of the body 1, thereby keeping the distance between the measuring end face of the sliding sleeve 5 and the detection block 4 stable and measurable.

[0038] The gasket structure 3 consists of multiple gaskets. By adjusting the number of gasket structures 3, the initial B0 value can be kept as an integer to facilitate calculation.

[0039] There are six sizes of tapered holes in the inner door panels of existing models. There are two types of tapered hole surfaces and four types of through holes on the tapered hole surfaces. The actual parameters for tapered hole testing are the forming depth of the tapered hole surface, the diameter of the through hole on the tapered hole surface, and the coaxiality between the through hole on the tapered hole surface and the tapered hole surface.

[0040] To meet the inspection requirements of the existing tapered bore surface of the door inner panel, the main body 1 of this device needs to be manufactured in two specifications, and the bore gauge 2 needs to be manufactured in four specifications. Depending on the inspection needs, dedicated measuring tools can be equipped according to the vehicle model, or the measurement requirements of multiple vehicle models can be met by replacing the bore gauge 2.

[0041] Example 2

[0042] like Figure 2 As shown in the figure, this embodiment also provides a detection method for a tapered hole detection device for automotive door sheet metal parts, which specifically includes the following steps:

[0043] a) Place the inner door panel to be inspected with the tapered hole facing upwards;

[0044] b) Loosen the locking screws of the detection device;

[0045] c) Place the conical surface of the main body against the conical hole surface of the inner panel of the door, and rotate the test block left and right by hand with the axis of the main body as the axis to ensure that the conical surface of the main body is completely against the conical hole surface of the inner panel of the door.

[0046] d) Slide the sliding sleeve up and down to make the end face of the sliding sleeve fully contact the plane around the tapered hole of the inner panel of the door, and tighten the locking screw to prevent the sliding sleeve from continuing to slide on the body.

[0047] e) Loosen the fastening screw 6 and remove the detection block 4. Adjust the thickness of the shim structure 3 so that the value of B0 is an integer, such as B0 = 5mm or 10mm. Use a vernier caliper to check the distance B between the lower end face of the detection block and the upper end face of the sliding sleeve and record the value and the distance B0 of the shim structure.

[0048] f) The difference between B and B0 is used as the depth deviation value of the tapered hole surface. The forming depth of the tapered hole in the mold is evaluated based on the deviation value.

[0049] A positive value of B-B0 indicates that the tapered hole surface is deeper, while a negative value indicates that the tapered hole surface is shallower. If the difference between B-B0 is within the specified range, the tapered hole surface depth is qualified; otherwise, it is unqualified, and the forming depth of the tapered hole in the mold needs to be adjusted.

[0050] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0052] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A device for detecting conical holes in automotive door sheet metal parts, characterized in that, The system includes a body (1), a bore gauge (2), a gasket (3), a detection block (4), and a sliding sleeve (5). The bore gauge (2) is installed in the mounting hole at the tapered end of the body (1) and is fastened by a screw plug (7). The sliding sleeve (5) is inserted from the other end of the tapered surface of the body (1). An anti-rotation pin (9) fastens the sliding sleeve (5) to the body (1). The sliding sleeve (5) is clearance-fitted with the body (1) and can slide along the axial direction of the body (1). The anti-rotation pin (9) restricts the sliding sleeve from rotating radially along the body. The detection block (4) is fixed to the non-tapered end of the body (1). A gasket structure (3) is provided between the detection block (4) and the non-tapered end of the body (1). The body (1) is a rotating body consisting of three stepped shafts and a conical surface. There is a round hole at the end of the conical surface. The stepped shaft surface connected to the conical surface is machined with a threaded hole for passing through the screw plug (7). A keyway is machined on the second stepped shaft for fastening the locking screw (8). A threaded hole is machined at 90° with the keyway for passing through the anti-rotation pin (9). A screw hole is machined at the end of the third stepped shaft for passing through the fastening screw (6). The sliding sleeve (5) is provided with a limiting long hole. The anti-rotation pin (9) passes through the limiting long hole on the sliding sleeve (5) and is fastened to the body (1). The anti-rotation pin (9) controls the sliding range of the sliding sleeve (5) through the limiting long hole on the sliding sleeve (5). The detection block (4) and the gasket structure (3) are fixed to the non-conical end of the body (1) by fastening screws (6); When the positioning end of the sliding sleeve (5) contacts the workpiece (10), the sliding sleeve (5) is fastened to the body (1) by the locking screw (8) so that the sliding sleeve (5) cannot slide along the axial direction of the body (1) so as to keep the distance between the measuring end face of the sliding sleeve (5) and the detection block (4) stable and measurable. The gasket structure (3) consists of multiple gaskets. By adjusting the number of gasket structures (3), the initial B0 value can be kept as an integer to facilitate calculation.

2. The detection method of the tapered hole detection device for automotive door sheet metal parts as described in claim 1, characterized in that, Specifically, the steps include the following: a) Place the inner door panel to be inspected with the tapered hole facing upwards; b) Loosen the locking screws of the detection device; c) Place the conical surface of the main body against the conical hole surface of the inner panel of the door, and rotate the test block left and right by hand with the axis of the main body as the axis to ensure that the conical surface of the main body is completely against the conical hole surface of the inner panel of the door. d) Slide the sliding sleeve up and down to make the end face of the sliding sleeve fully contact the plane around the tapered hole of the inner panel of the door, and tighten the locking screw to prevent the sliding sleeve from continuing to slide on the body. e) Remove the testing device, use a vernier caliper to check the distance B between the lower end face of the testing block and the upper end face of the sliding sleeve, and record the value and the distance B0 of the gasket structure; f) The difference between B and B0 is used as the depth deviation value of the tapered hole surface. The deviation value is used to evaluate whether the forming depth of the tapered hole in the mold is qualified.

3. The detection method of the tapered hole detection device for automotive door sheet metal parts as described in claim 2, characterized in that, A positive value of B-B0 indicates that the tapered hole surface is deeper, while a negative value indicates that the tapered hole surface is shallower. If the difference between B-B0 is within the specified range, the tapered hole surface depth is acceptable; otherwise, it is unacceptable and the forming depth of the tapered hole in the mold needs to be adjusted.

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