Conical shaft size measuring tool

Abstract

The utility model discloses a cone shaft size measuring tool which comprises a calibration gauge and a measuring gauge. One end of the calibration gauge is provided with a measuring surface, the measuring surface is provided with taper, one end of the measuring gauge is provided with a first reference surface and a second reference surface, a step is arranged between the first reference surface and the second reference surface, the step is provided with a through hole along the axial direction of the measuring gauge, and the inner side of the through hole is a working surface. The working face is provided with taper, and the measuring face is matched with the working face. The measuring tool provided by the utility model is simple in structure and principle, flexible and convenient to operate and low in cost, is a comprehensive inspection tool, and can inspect the taper of the measured cone shaft and the diameter of the measured cone shaft. The device is suitable for the measurement of the detected cone shaft with high precision requirements, is accurate in detection result and high in detection efficiency, can be used for large-scale detection, and has good popularization and application values.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical measuring tools, and in particular to a tapered shaft dimension measuring tool. Background Technology

[0002] Inspecting the taper and length of tapered shafts is a crucial step in machining and quality control. However, accurately measuring these parameters is not easy. Commonly used measuring tools, such as vernier calipers and micrometers, are often insufficient for accurate and comprehensive measurement of the taper and length of tapered shafts due to limitations in their measurement principles and accuracy. Taper, as a vital geometric parameter describing the angle between the generatrix and axis of the cone, directly affects the fit and performance of tapered shaft parts. Accurate diameter measurement is fundamental to ensuring that the dimensions of the parts meet design requirements.

[0003] Currently, while optical measuring devices like projectors can be used in industry to inspect the taper and length of tapered shafts, improving measurement accuracy to some extent, their high cost is a burden that many small and medium-sized enterprises cannot afford. Furthermore, projectors have relatively low measurement efficiency, especially when facing large-volume inspection tasks, where this inefficient method can severely impact production schedules. More importantly, for shorter tapered shaft sections, due to factors such as projection magnification and light refraction, projector measurement results are often inaccurate and cannot meet the demands of high-precision machining and quality control.

[0004] Therefore, exploring more efficient, accurate, and cost-effective methods for inspecting the dimensions of tapered shafts has become an urgent problem to be solved in the field of machining and quality control. Summary of the Invention

[0005] The purpose of this invention is to provide a tapered shaft dimension measuring tool to solve the problems of low measurement accuracy and efficiency in existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tapered shaft dimensional measuring tool, comprising a calibration gauge and a measuring gauge;

[0008] One end of the calibration gauge is provided with a measuring surface, and the measuring surface is provided with a taper. One end of the measuring gauge is provided with a first reference surface and a second reference surface. A step is provided between the first reference surface and the second reference surface. A through hole is opened along the axial direction of the measuring gauge at the step. The inside of the through hole is a working surface, and the working surface is provided with a taper. The measuring surface mates with the working surface.

[0009] Furthermore, both the measuring surface and the working surface are made of GCr15 material.

[0010] Furthermore, the other end of the calibration gauge is provided with a handle, and the handle is provided with knurling.

[0011] Furthermore, the measuring surface of the calibration gauge is connected to the handle via a neck.

[0012] Furthermore, the height of the first reference plane is greater than the height of the second reference plane.

[0013] Furthermore, the roughness of both the measuring surface and the working surface is Ra0.8.

[0014] Furthermore, the outer surface of the measuring gauge is knurled.

[0015] Furthermore, the taper of both the measuring surface and the working surface is consistent with the taper of the measured cone axis.

[0016] Furthermore, the length of the measuring surface is 3 to 4 times the length of the cone surface of the measured cone shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention provides a tapered shaft dimension measuring tool, comprising a calibration gauge and a measuring gauge, which are used in conjunction. A measuring surface with a taper is provided at one end of the calibration gauge, while a first reference surface and a second reference surface are provided at one end of the measuring gauge. A step is provided between the first and second reference surfaces, and a through hole is formed along the axial direction of the measuring gauge at the step. The working surface inside the through hole has a taper, allowing the measuring surface to mate with the working surface. The measuring surface of the calibration gauge is first used to calibrate the accuracy of the working surface of the measuring gauge. After passing the calibration, the measuring gauge is used to measure the tapered shaft being tested. This invention's measuring tool has a simple structure and principle, is flexible and convenient to operate, and is low in cost. It is a comprehensive inspection tool that can inspect both the taper and diameter of the tapered shaft being tested. It is suitable for measuring tapered shafts with high precision requirements, providing accurate results and high efficiency. It can be used for large-scale testing and has good application value.

[0019] Furthermore, both the measuring surface and the working surface are made of GCr15 material, which has high hardness and wear resistance, high contact fatigue strength and wear resistance, which makes the measuring device maintain its accuracy well and extends its service life. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the tapered shaft dimension measurement process of this utility model.

[0022] Figure 2 This is a schematic diagram of the calibration gauge structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the measuring gauge structure of the present invention, wherein (a) is a cross-sectional view of the measuring gauge and (b) is a top view of the measuring gauge.

[0024] Wherein: 1-calibration gauge, 2-measuring gauge, 3-measuring surface, 4-neck, 5-handle, 6-working surface, 7-first reference surface, 8-second reference surface, 9-step, 10-measured cone shaft. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings:

[0032] See Figures 1 to 3 This utility model provides a tapered shaft dimension measuring tool, including a calibration gauge 1 and a measuring gauge 2. The calibration gauge 1 and the measuring gauge 2 are used together. After the calibration gauge 1 calibrates the measuring gauge 2, the measuring gauge 2 is used to measure the taper and diameter of the tapered shaft 10 to be measured.

[0033] like Figure 2 As shown, the calibration gauge 1 includes a measuring surface 3, a neck 4, and a handle 5. The measuring surface 3, located at one end of the calibration gauge 1, is made of GCr15 material and precision-polished, possessing high hardness and wear resistance. The measuring surface 3 has a taper, directly contacting the measuring gauge 2. The surface roughness of the working surface 3 reaches Ra0.8, and the taper is consistent with the measured tapered shaft 10, ensuring tight contact with the measuring gauge 2. The measuring surface 3 is inserted into the working surface 6 to determine whether the measuring gauge 2 is qualified. The length of the measuring surface 3 is 3 to 4 times the tapered surface length of the measured tapered shaft 10, resulting in more accurate calibration of the measuring gauge 2. The handle 5 is located at the other end of the calibration gauge 1. The handle 5 has knurled edges, conforming to ergonomics for easy handholding and force application. The measuring surface 3 and the handle 5 are connected by the neck 4, a pre-reserved slot in lathe machining, particularly during machining, to facilitate tool removal and machining to the bottom of the blank. This design not only simplifies the machining process but also improves machining efficiency.

[0034] like Figure 3As shown, the measuring gauge 2 includes a working surface 6, a first reference surface 7, a second reference surface 8, and a step 9. The first reference surface 7 and the second reference surface 8 are located at one end of the measuring gauge 2. A step 9 is provided between the first reference surface 7 and the second reference surface 8, making the height of the first reference surface 7 greater than the height of the second reference surface 8, used to determine whether the measured conical shaft 10 is qualified. A through hole is provided along the axial direction of the measuring gauge 2 at the step 9. The inner side of the through hole is the working surface 6, which is the main body of the measuring gauge 2. It is made of GCr15 material and precision polished to a surface roughness of Ra0.8, exhibiting high hardness and wear resistance. The working surface 6 has a taper. After the measuring surface 3 is aligned and calibrated with the working surface 6, it directly contacts the measured conical shaft 10. The outer surface of the measuring gauge 2 is knurled to increase friction and provide anti-slip properties. The outer surface mainly supports and fixes the measuring gauge 2 and does not participate in the measurement process, facilitating handheld operation and rotation by the operator.

[0035] The taper of measuring surface 3 and working surface 6 is consistent with the taper of the tapered shaft 10 being measured, ensuring that working surface 6 is in close contact with the tapered shaft 10. The tapered shaft 10 is then inserted into working surface 6, and its taper and diameter are measured. Figure 1 As shown, after the tapered shaft 10 to be measured is inserted into the working surface 6 of the measuring gauge 2, the small end face of the tapered shaft 10 to be measured is located at the position of step 9. The diameter of the position of step 9 can respectively limit the minimum and maximum diameter of the small end face of the tapered shaft 10 to be measured. It is not higher than the first reference surface 7, and not lower than the second reference surface 8. That is, the tapered shaft 10 to be measured is considered to be qualified.

[0036] The manufacturing method of the tapered shaft dimension measuring tool of this utility model:

[0037] Calibration gauge 1 and measurement gauge 2 are made of high-quality rolling bearing steel GCr15. The intermediate process involves heat treatment quenching and low-temperature tempering to give the material high hardness and wear resistance, high contact fatigue strength and wear resistance, thereby improving the service life of the measuring tools.

[0038] Calibration gauge 1 and measurement gauge 2 are precision measuring tools. Before precision manufacturing, they undergo cold treatment at -60~-80℃ to reduce the amount of residual austenite inside the material, stabilize the internal structure, and ensure that the geometric accuracy of the measuring tools is not affected by external factors during later use, so that the accuracy remains unchanged over a long period of time.

[0039] Manufactured using an ultra-high precision CNC universal grinding machine, calibration gauge 1 and measuring gauge 2 are positioned using double centers with central holes at both ends and a precision chuck. The geometric angular errors of the taper of calibration gauge 1 and measuring gauge 2 are strictly controlled by a precision servo motor directly driving the grinding wheel head to rotate. Precision servo motors, linear hydrostatic guides, and lead screws drive the grinding wheel for longitudinal grinding, strictly controlling the straightness, roundness, contour errors, surface quality, and diameter dimensions of the taper generatrix of calibration gauge 1 and measuring gauge 2, ensuring that the measuring tool achieves an IT5 level of measurement accuracy.

[0040] The measurement method of the tapered shaft dimension measuring tool of this utility model:

[0041] This invention uses a coloring method to check taper, which can simultaneously check the diameter of the large and small ends of the measured cone shaft 10. The operation method is simple, and the measurement is similar to the usage situation, making it a comprehensive measurement. The coloring method for checking taper is strictly performed in accordance with the provisions of the "Verification Procedure for Conical Gauges" (JJG177-1997).

[0042] Apply red lead powder to the conical surface of measuring gauge 2, evenly applying three lines in three equal parts of the circumference, with a coating thickness of 2-4 μm. Place the cone shaft 10 to be measured vertically and fix it in place. Holding measuring gauge 2, slowly and vertically insert it onto the cone shaft 10 from top to bottom, ensuring tight contact between the conical surfaces. Manually rotate measuring gauge 2 several times around the center of the cone shaft 10, with each rotation angle greater than 30°. Then, holding measuring gauge 2, remove it from the cone shaft 10 from bottom to top. Observe the tightness of the contact between the two conical surfaces. A tight fit is considered acceptable when the contact area of ​​measuring gauge 2 reaches 80% of its area after rotation, indicating that the taper shape profile of the cone shaft 10 is acceptable. When the cone shaft 10 is inserted into measuring gauge 2, if the small end face of the taper of the cone shaft 10 is located at step 9, not higher than the first reference surface 7, and not lower than the second reference surface 8, then the diameter of the cone shaft 10 is considered acceptable.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tapered shaft dimensional measuring tool, characterized in that, Including calibration gauge (1) and measurement gauge (2); The calibration gauge (1) has a measuring surface (3) at one end, and the measuring surface (3) has a taper. The measuring gauge (2) has a first reference surface (7) and a second reference surface (8) at one end, and a step (9) is provided between the first reference surface (7) and the second reference surface (8). A through hole is provided at the step (9) along the axial direction of the measuring gauge (2). The inside of the through hole is a working surface (6), and the working surface (6) has a taper. The measuring surface (3) and the working surface (6) cooperate.

2. The tapered shaft dimensional measuring tool according to claim 1, characterized in that, The measuring surface (3) and the working surface (6) are both made of GCr15 material.

3. The tapered shaft dimension measuring tool according to claim 1, characterized in that, The other end of the calibration gauge (1) is provided with a handle (5), and the handle (5) is provided with knurling.

4. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The measuring surface (3) of the calibration gauge (1) is connected to the handle (5) via a neck (4).

5. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The height of the first reference plane (7) is greater than the height of the second reference plane (8).

6. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The roughness of both the measuring surface (3) and the working surface (6) is Ra0.

8.

7. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The outer surface of the measuring gauge (2) is knurled.

8. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The taper of the measuring surface (3) and the working surface (6) are both consistent with the taper of the measured cone shaft (10).

9. A tapered shaft dimension measuring tool according to claim 1, characterized in that, The length of the measuring surface (3) is 3 to 4 times the length of the cone surface of the measured cone shaft (10).

Images