Keyway detection measuring tool

Abstract

The utility model provides a keyway detection measuring tool, which comprises a tool bottom plate, a supporting mechanism, a standard part and a measuring tool, the supporting mechanism is arranged on the tool bottom plate and is used for supporting and limiting the standard part or a workpiece to be detected, the standard part is matched with the workpiece to be detected in appearance, a detection part corresponding to a keyway on the workpiece to be detected is arranged on the standard part, and the measuring tool is used for measuring the keyway on the workpiece to be detected. The detection part is a plane corresponding to a size to be measured, the measuring tool is arranged above the tool bottom plate, and a telescopic measuring head is arranged on the measuring tool. The measuring tool provided by the utility model is simple and small in structure, realizes on-line measurement, improves the detection efficiency, and meets the requirements of mass production.

Description

Technical Field

[0001] This utility model relates to the field of grinding technology, and in particular to a keyway inspection gauge. Background Technology

[0002] Diesel high-pressure common rail injection technology is currently the most advanced engine technology in the world. Its low fuel consumption and low exhaust emissions are of great significance for improving the current air quality. However, because the internal pressure of its pump reaches 1800 kg, the requirements for the machining and inspection of parts are extremely stringent, with the machining and inspection of the camshaft, a key component, being particularly important.

[0003] Camshafts, as common rail components, are characterized by their small size and high precision requirements. The distance from the end face of the arc-shaped keyway on the camshaft to B (i.e., the distance from the bottom of the keyway to the center of the camshaft shaft) is significant. Figure 1 As shown, this dimension (requiring high precision) is the dimension that needs to be inspected during the post-grinding machining process of the keyway. Due to the characteristic shape of this keyway, online inspection of the keyway end face distance is difficult. It is necessary to go to the inspection department and use a special inspection measuring instrument: a coordinate measuring machine combined with a shape measuring device for inspection. During inspection, it is necessary to travel back and forth between the inspection department and the machining tool, which results in long inspection time and low inspection efficiency, thus leading to low machining efficiency. Utility Model Content

[0004] The present invention aims to provide a keyway inspection gauge to overcome the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a keyway inspection measuring tool, including a tooling base plate, a support mechanism, a standard part, and a measuring tool. The support mechanism is disposed on the tooling base plate and is used to support and limit the standard part or the workpiece to be measured. The standard part is adapted to the shape of the workpiece to be measured, and the standard part is provided with a detection part corresponding to the keyway on the workpiece to be measured. The detection part is a plane corresponding to the dimension to be measured. The measuring tool is disposed above the tooling base plate and is provided with a telescopic measuring head.

[0006] Furthermore, in the aforementioned keyway testing gauge, the support mechanism includes a support block one and a support block two. The support block one and the support block two are arranged along the axial direction of the standard part or the workpiece to be tested, and both of them are provided with a V-shaped support at their upper ends.

[0007] Furthermore, in the aforementioned keyway testing gauge, the support block is positioned near the testing part of the standard part, and one side of the support block is a limiting side. The limiting side cooperates with a step on the standard part or the workpiece to be tested to limit the axial position of the standard part or the workpiece to be tested.

[0008] Furthermore, in the aforementioned keyway inspection gauge, the measuring tool is mounted on the tooling base plate via a mounting base. A limiting step is provided on one side of the tooling base plate, and the side of the mounting base near the support mechanism abuts against the limiting step.

[0009] Furthermore, in the aforementioned keyway inspection gauge, the upper end of the mounting base is provided with a mounting through hole, the fixed end of the measuring tool is inserted into the mounting through hole, and is fixedly connected to the mounting base by a limiting member located at the top of the mounting through hole. The measuring head is connected to the telescopic end of the measuring tool and is located on the side of the mounting base near the support mechanism.

[0010] Furthermore, in the aforementioned keyway detection gauge, the fixed end of the measuring tool is fitted with a bushing, the bushing is inserted into the mounting through hole, the outer side of the bushing is provided with an axially arranged opening groove, and the outer side of the bushing is also provided with at least one limiting plane that cooperates with the limiting member.

[0011] Furthermore, the bottom of the tooling base plate of the aforementioned keyway inspection gauge is also provided with a groove.

[0012] Furthermore, in the aforementioned keyway testing gauge, the mounting base is provided in multiple locations and is arranged along the axial direction of the workpiece to be tested.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the measuring tool of this utility model has a simple and compact structure, realizes online measurement, and the operator can directly use the measuring tool to detect the depth of the arc keyway. The shape measuring device can be used for random inspection. It is convenient to use, improves the detection efficiency, and meets the needs of mass production. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the workpiece to be tested for the keyway testing gauge of this utility model;

[0016] Figure 2 This is a schematic diagram of the standard part measurement of the keyway testing gauge of this utility model;

[0017] Figure 3 This is a top view of the keyway testing gauge of this utility model;

[0018] Figure 4 This is a side view of the keyway testing gauge of this utility model;

[0019] Figure 5 This is a schematic cross-sectional view of the tooling base plate of the keyway testing gauge of this utility model;

[0020] Figure 6 This is a schematic diagram of the bushing of the keyway testing gauge of this utility model;

[0021] Figure 7 This is a schematic diagram of multi-position measurement of the keyway testing gauge of this utility model;

[0022] In the diagram: 1. Tooling base plate; 11. Limiting step; 12. Groove;

[0023] 2. Support mechanism; 21. Support block one; 211. Limiting side; 22. Support block two;

[0024] 3. Standard parts; 31. Inspection department;

[0025] 4. Measuring tools; 41. Measuring head;

[0026] 5. The workpiece to be tested;

[0027] 6. Mounting base; 61. Mounting through hole;

[0028] 7. Limiting component; 8. Bushing; 81. Limiting plane. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example

[0031] like Figure 1-7As shown, a keyway inspection gauge includes a fixture base plate 1, a support mechanism 2, a standard part 3, and a measuring tool 4. The support mechanism 2 is mounted on the fixture base plate 1 and is used to support and limit the standard part 3 or the workpiece 5 to be measured. The standard part 3 is adapted to the shape of the workpiece 5, and the standard part 3 is provided with a detection part 31 corresponding to the keyway on the workpiece 5. The detection part 31 is a plane corresponding to the dimension to be measured (end face distance B). Since the keyway is arc-shaped, it is not convenient to inspect. Making the detection part 31 a plane makes it easier to calibrate the reference. The measuring tool 4 is located above the fixture base plate 1 and is provided with a telescopic measuring head 41. The keyway inspection gauge of this utility model has a simple and compact structure and can be directly mounted on the machining tool for processing the workpiece (camshaft) to be measured, or on the worktable near the machining tool, etc., to achieve online monitoring, making inspection more convenient and improving inspection efficiency.

[0032] Among them, such as Figure 5 As shown, the bottom of the tooling base plate 1 is also provided with a groove 12. The groove 12 is a groove that is slightly smaller than the bottom surface of the tooling base plate 1, which can prevent the inspection tool from adhering to the mounting surface and facilitate disassembly and assembly.

[0033] like Figure 1-4 As shown, the support mechanism 2 includes a support block 1 21 and a support block 22. The support block 1 21 and the support block 22 are arranged along the axial direction of the standard part 3 or the workpiece 5 to be tested, and both of them are provided with a V-shaped support at their upper ends.

[0034] In the above structure, the support block 21 is located near the detection part 31 of the standard part 3. One side of the support block 21 is a limiting side 211. The limiting side 211 cooperates with a step on the standard part 31 or the workpiece 5 to limit the axial position of the standard part 3 or the workpiece 5 to be tested. When the step abuts against the limiting side 211, the detection part 31 is aligned with the measuring head 41, or the keyway is basically aligned with the measuring head 41.

[0035] like Figure 4-5 As shown, the measuring tool 4 is mounted on the tooling base plate 1 via a mounting base 6. A limiting step 11 is provided on one side of the tooling base plate 1, and the side of the mounting base 6 closest to the support mechanism 2 abuts against the limiting step 11. The limiting step 11 is right-angled and fits the lower corner of the mounting base 6. This right-angled limiting step ensures the horizontality and verticality of the measuring tool, guaranteeing the accuracy of the inspection.

[0036] like Figure 4 As shown, the upper end of the mounting base 6 is provided with a mounting through hole 61. The fixed end of the measuring tool 4 is inserted into the mounting through hole 61 and is fixedly connected to the mounting base 6 by a limiting member 7 located at the top of the mounting through hole 61. The measuring head 41 is connected to the telescopic end of the measuring tool 4 and is located on the side of the mounting base 6 near the support mechanism 2.

[0037] In the above structure, such as Figure 6 As shown, the measuring tool 4 has a bushing 8 on its fixed end. The bushing 8 is inserted into the mounting through hole 61. The bushing 8 has an axially oriented opening groove on its outer side, which facilitates the installation of the bushing 8. The bushing 8 also has at least one limiting plane 81 that cooperates with the limiting member 7 to ensure that the measuring tool is installed securely.

[0038] In addition, such as Figure 7 As shown, multiple mounting bases 6 are provided and arranged along the axial direction of the workpiece 5 to be measured. The measuring tool of this invention can also measure other radial dimensions on the workpiece, such as the dimensions of ordinary flat keys and keyways. The mounting base is correspondingly set at the measurement position on the camshaft, and the measuring tool on the mounting base can then measure the corresponding dimensions on the camshaft. This invention is also applicable to the measurement of radial dimensions on the exterior of other shaft-type parts.

[0039] The measurement method of this utility model is as follows: First, the standard part 3 is placed on the support mechanism 2, and the detection part 31 of the standard part is aligned with the measuring head 41. The design dimensions are calibrated using the standard part 3. After calibration, the measuring tool 4 is zeroed. Then, the actual dimensions of the part to be measured 5 are measured based on this zeroing position. The operator places the workpiece to be measured on the support mechanism 2, with the keyway to be measured facing the measuring head. The measuring head 41 is gently pushed into the keyway of the workpiece to be measured, and the measuring head 41 abuts against the bottom surface of the keyway. The workpiece to be measured is moved axially in a small amplitude to find the lowest point of the keyway. At this time, the value displayed on the measuring tool is the difference between the actual size and the reference value (design size). The processing is judged based on the size of the difference.

[0040] This invention provides a measuring tool that enables online measurement. Operators can directly use this measuring instrument to measure the depth of arc-shaped keyways, while a shape measuring device can perform random checks. It is convenient to use, improves inspection efficiency, and meets the needs of mass production. Furthermore, this measuring instrument can also be used to measure other types of outer diameter end face dimensions. Verification by a coordinate measuring machine and shape measuring device shows a 100% pass rate.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A keyway detection gauge, characterized by: The fixture includes a base plate, a support mechanism, standard parts, and measuring tools. The support mechanism is mounted on the base plate and is used to support and limit the standard parts or the workpiece to be measured. The standard parts are adapted to the shape of the workpiece to be measured, and the standard parts are provided with a detection part corresponding to the keyway on the workpiece to be measured. The detection part is a plane corresponding to the dimension to be measured. The measuring tools are located above the base plate and are provided with a telescopic measuring head.

2. The keyway inspection gauge of claim 1, wherein: The support mechanism includes support block one and support block two. Support block one and support block two are arranged along the axial direction of the standard part or the workpiece to be tested, and both of them are provided with V-shaped support parts at their upper ends.

3. The keyway inspection gauge of claim 2, wherein: The support block is positioned near the detection part of the standard part. One side of the support block is a limiting side, which cooperates with a step on the standard part or the workpiece to be tested to limit the axial position of the standard part or the workpiece to be tested.

4. The keyway inspection gauge of claim 1, wherein: The measuring tool is mounted on the tooling base plate via a mounting base. A limiting step is provided on one side of the tooling base plate, and the side of the mounting base near the support mechanism abuts against the limiting step.

5. The keyway inspection gauge of claim 4, wherein: The upper end of the mounting base is provided with a mounting through hole. The fixed end of the measuring tool is inserted into the mounting through hole and is fixedly connected to the mounting base by a limiting member located at the top of the mounting through hole. The measuring head is connected to the telescopic end of the measuring tool and is located on the side of the mounting base near the support mechanism.

6. The keyway inspection gauge of claim 5, wherein: The measuring tool has a bushing fitted on its fixed end. The bushing is inserted into the mounting through hole. The bushing has an axially oriented opening groove on its outer side, and at least one limiting plane that cooperates with the limiting member is also provided on the outer side of the bushing.

7. The keyway inspection gauge of claim 1, wherein: The bottom of the tooling base plate is also provided with a groove.

8. The keyway inspection gauge of any of claims 4-6, wherein: Multiple mounting bases are provided and arranged along the axial direction of the workpiece to be tested.

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