Measuring tool and method for testing the distance from the cross section to the end face at the inner cone surface of an annular part

Abstract

The present invention discloses a measuring tool for testing the distance from the cross section to the end face at the inner conical surface of a ring part, including a positioning mechanism and a measuring mechanism. The measuring mechanism is detachably mounted on the positioning mechanism. The positioning mechanism is used to contact the end face of a workpiece and position the measuring mechanism to a specified position. The measuring mechanism includes a measuring unit and a measuring seat. The measuring unit is provided with a measuring end and a detection end. The end face of the measuring end contacts the inner conical surface to be measured of the workpiece. The measuring seat is provided with a mounting hole opened along the central axis direction. The measuring unit is slidably mounted in the mounting hole. The end face of the measuring seat away from the measuring end is also provided with a step surface formed by two planes with different surface heights. The positional relationship between the end face of the detection end and the two step surfaces is used to determine whether the distance from the cross section to the end face at the inner conical surface of the ring part is qualified. The present invention also discloses an inspection method including the above-mentioned measuring tool. The present invention can solve the technical problems of low efficiency, high cost and low accuracy of novice detection in the existing detection methods.

Description

Technical Field

[0001] The present invention relates to the technical field of inspection of annular workpieces of aircraft engines with inner conical surfaces, and in particular, to an inspection tool for the distance from the cross section to the end face at the inner conical surface of an annular part. In addition, the present invention also relates to an inspection method comprising the inspection tool for the distance from the cross section to the end face at the inner conical surface of an annular part. Background Art

[0002] The bearing seat of an aircraft engine is one of the important components of the engine transmission. Although the external structure of the bearing seat is annular, the internal structure of the bearing seat is relatively complex, especially the inspection of the inner conical surface of the bearing seat. The inner conical surface is located in the area between two annular flanges arranged at an angle in the inner cavity of the bearing seat. The inspection of the inner conical surface of the bearing seat is often to detect whether the distance between the cross section and the end face of the inner conical surface at the specified diameter φA is within the tolerance range, which is easily hindered by the two annular flanges during inspection.

[0003] The existing detection of the inner conical surface of the bearing seat generally includes the following two methods: (1) three-coordinate measuring machine measurement: first use the three-coordinate measuring machine to sample at least 16 points on the end face of the workpiece to form a surface; take this surface as the reference and then sample 16 points on two different sections of the inner conical surface of the workpiece to form two different circular sections, and then simulate the conical surface of the workpiece; calculate and analyze the results through the three-coordinate built-in software; (2) measurement by comparison method: first make a special tooling and a special table frame to compare the size structure of the table and the workpiece Similar, and measure the true value of the cross-section circle φC at the end face distance H3. The table frame can be extended and retracted when measuring the diameter, and can avoid interference. The measuring head of the table frame can measure to the height H3 of the inner cone; according to φA, H1 and H2, when converted to L, the maximum and minimum values ​​of φC; first use the table frame to place it on the table to zero the table, then put the table frame on the workpiece, record the value of the indicator on the table frame, the value of the indicator table plus the true value of φC, and then compare it with the maximum and minimum values ​​of φC to determine whether the workpiece is qualified. The above two detection methods have the following problems: the three-coordinate measuring instrument measurement is inefficient, and at least 64 points are required to measure the required value, which takes at least 20 minutes; and there are restrictions on the use of the site, and it cannot be used when the workpiece is still installed on the machine tool; the comparison method measurement cost is relatively high, especially the retractable and large-range diameter measuring table frame, which is at least tens of thousands; and the user's skills are too high, and it is difficult for novice workers to measure accurately. Summary of the invention

[0004] The invention provides a measuring tool and method for inspecting the distance from a cross section to an end face at an inner conical surface of an annular part, so as to solve the technical problems of low efficiency, high cost and low detection accuracy in the existing detection methods.

[0005] According to one aspect of the present invention, a measuring tool for inspecting the distance from the cross section to the end face at the inner conical surface of an annular part is provided, which is used for inspecting the distance from the cross section to the end face of an annular workpiece containing an inner conical surface inside at a specified diameter, wherein the specified diameter cross section is a cross section located at the inner conical surface to be measured, and the inner conical surface refers to the conical surface area between two annular flanges arranged at an angle in the inner cavity of the annular workpiece, including a positioning mechanism and a measuring mechanism, wherein the measuring mechanism is detachably mounted on the positioning mechanism, wherein the positioning mechanism is used to contact the end face of the workpiece and position the measuring mechanism to a specified position, wherein the measuring mechanism includes a measuring unit and a measuring seat, wherein the central axis of the measuring seat is arranged at an angle to the positioning mechanism, wherein a measuring end and a detection end are provided on the measuring unit, wherein the end face of the measuring end is used to abut against the inner conical surface to be measured of the workpiece, wherein a mounting hole is provided on the measuring seat along the direction of its central axis, wherein the measuring unit is slidably mounted in the mounting hole, wherein a reference hole is further provided on the measuring seat, wherein the center line of the reference hole intersects the center line of the workpiece perpendicularly,

[0006] The end face of the measuring seat away from the measuring end is also provided with a step surface formed by two planes with different surface heights. The positional relationship between the end face of the detection end and the two step surfaces is used to determine whether the distance from the cross section to the end face at the inner cone surface of the annular part is qualified.

[0007] Furthermore, the positioning mechanism includes a positioning plate and a positioning pin arranged on the positioning plate for contacting the outer circle of the workpiece, the positioning plate is provided with a mounting groove, the measuring seat is detachably mounted on the mounting groove, and the measuring end and the detection end of the measuring unit are respectively located on both sides of the mounting groove.

[0008] Furthermore, the positioning plate is a polygonal plate, the number of the positioning pins is two, the two positioning pins are respectively arranged at the two ends of the positioning plate in the length direction, the positioning pins and the mounting grooves are respectively arranged at the two ends of the positioning plate in the width direction, and the longitudinal distance E from the center of the positioning pin to the reference hole is ((B+D) 2 / 4-F 2 ) 1 / 2 , where B is the outer diameter of the workpiece, D is the diameter of the locating pin, and F is the distance between the center line of the installation slot in the length direction and the two locating pins. The three dimensions E, F, and D are used to ensure that the center line intersects with the center line of the workpiece and thus ensure that the detection end of the measuring unit can contact the central section of the workpiece.

[0009] Furthermore, the positioning mechanism is provided with an operating portion for positioning the positioning mechanism and installing it on the workpiece.

[0010] Furthermore, the measuring unit includes a measuring pin slidably installed in the mounting hole and a control part that controls the sliding of the measuring pin in the mounting hole. The measuring seat is provided with a control hole for the movement of the control part. One end of the control part is fixed to the measuring pin, and the other end of the control part passes through the measuring seat from the control hole.

[0011] Furthermore, the measuring pin includes a ball head end that contacts the measured inner conical surface of the workpiece and a judgment end used to judge whether the workpiece is qualified. The ball head end is the measuring end of the measuring unit, and the judgment end is the detection end of the measuring unit. The end face of the ball head end is a spherical structure, and the end face of the judgment end is a plane structure. The end face of the judgment end is parallel to the two planes of the step surface.

[0012] Furthermore, the height difference of the step surface is equal to L2-L1, where L2=(G+H2)*cosα+(A / 2)*sinα, L1=(G+H1)*cosα+(A / 2)*sinα, in the above formulas: G is the distance value from the reference hole to the support surface formed by the contact between the positioning mechanism and the end face of the workpiece, H1 is the minimum value from the specified diameter section of the workpiece to the end face of the workpiece, H2 is the maximum value from the specified diameter section of the workpiece to the end face of the workpiece, A is the diameter value at the specified diameter, and α is equal to 90° minus the slope value of the measured inner cone surface of the workpiece.

[0013] Furthermore, a center line connecting the measuring end and the detecting end of the measuring unit intersects with the outer circular axis of the workpiece, and an angle between the two is equal to α.

[0014] Furthermore, the radial dimension of the measuring end of the measuring unit gradually decreases from the middle to the end. According to another aspect of the present invention, a method for inspecting the distance from the cross section to the end face at the inner conical surface of an annular component is provided, which comprises the above-mentioned measuring tool for inspecting the distance from the cross section to the end face at the inner conical surface of an annular component, and comprises the following steps:

[0015] S1. Place the positioning mechanism close to the end face of the workpiece, and make the end face of the measuring end of the measuring unit contact with the measured inner conical surface of the workpiece, and observe the relative position between the detection end of the measuring unit and the step surface;

[0016] S2. If the detection end of the measuring unit is between the step surfaces, the workpiece is qualified; if the detection end of the measuring unit extends out of the step surface or does not reach the step surface, the workpiece is unqualified.

[0017] Furthermore, the workpiece is always mounted on the machine tool during inspection.

[0018] The present invention has the following beneficial effects:

[0019] (1) The measuring tool for inspecting the distance from the cross section to the end face at the inner conical surface of an annular part of the present invention is a tool for inspecting the distance from the cross section to the end face at a specified diameter of an annular workpiece containing an inner conical surface. The measuring tool is fixed at the position to be measured of the workpiece by a positioning mechanism, and then the measuring unit of the measuring mechanism slides in the mounting hole so that the measuring end of the measuring unit contacts the inner conical surface to be measured. The positional relationship between the end face of the inspection end and the two step surfaces is used to determine whether the distance from the cross section to the end face at the inner conical surface of the annular part is qualified. If the inspection end of the measuring unit is located between the step surfaces, the workpiece is qualified; if the inspection end of the measuring unit extends out of the step surface or does not reach the step surface, the workpiece is unqualified, which can ensure The detection of the qualified rate of workpieces takes a short time and is highly efficient. Moreover, since the determination is made by using a measuring tool, it is only required that the operator can use the measuring tool, and the technical requirements for the operator are greatly reduced, and a novice can also achieve a high detection accuracy rate. In addition, the measuring tool of the present invention only includes two structures, a positioning mechanism and a measuring mechanism, and the measuring mechanism also only includes two structures, a measuring seat and a measuring unit. The structure is relatively simple, the operation process is relatively simple, and the manufacturing cost and the inspection cost are relatively low. At the same time, the present invention is small in size and light, and can be used in a variety of occasions. Moreover, by changing the position and shape of the measuring unit, it can be applied to annular workpieces with more complex structures containing inner cones, and has a wide range of applications.

[0020] (2) The inspection process of the method for inspecting the distance from the cross section to the end face at the inner conical surface of the annular part of the present invention is very simple. The measuring tool is fixed at the position to be measured of the workpiece by a positioning mechanism, and then the measuring unit of the measuring mechanism slides in the mounting hole so that the measuring end of the measuring unit contacts the inner conical surface to be measured. The positional relationship between the end face of the inspection end and the two step surfaces is used to judge whether the distance from the cross section to the end face at the inner conical surface of the annular part is qualified. If the position of the inspection end of the measuring unit is between the step surfaces, the workpiece is qualified; if the inspection end of the measuring unit extends out of the step surface or does not reach the step surface, the workpiece is unqualified, which can ensure that the inspection time for the qualified rate of the workpiece is short. It takes no more than 10 seconds to inspect whether a workpiece is qualified, and the inspection efficiency is high. In addition, since the inspection tool is used for judgment, it is only required that the operator can use the measuring tool, and the technical requirements for the operator are greatly reduced. Novices can also achieve a high inspection accuracy. The method of the present invention has been used in our company for many years and has been applied to many similar workpieces. It is efficient and has a very stable structure.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the structure of a measuring tool for testing the distance from the cross section to the end face at the inner conical surface of a ring member according to a preferred embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a distance testing tool from a cross section to an end face of an annular member in a preferred embodiment of the present invention in a testing state;

[0025] Figure 3 Figure 2 Left view of

[0026] Figure 4 It is a schematic diagram of the principle structure of the conversion relationship between the distance from the cross section to the end surface at the inner cone surface of the annular member of the preferred embodiment of the present invention and the height difference of the step surface.

[0027] Legend:

[0028] 1. Positioning mechanism; 11. Positioning plate; 111. Mounting groove; 12. Positioning pin; 13. Operating unit; 2. Measuring unit; 21. Measuring unit; 211. Measuring pin; 212. Control unit; 22. Measuring seat; 221. Mounting hole; 222. Step surface; 223. Reference hole; 224. Control hole; 3. Workpiece. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0030] like Figure 1-4 As shown, the measuring tool for testing the distance from the section to the end face at the inner conical surface of the annular part of this embodiment is used to test the distance from the section to the end face of the annular workpiece containing the inner conical surface inside at a specified diameter. The specified diameter section is the section located at the inner conical surface to be measured. The inner conical surface refers to the conical surface area between two annular flanges arranged at an angle in the inner cavity of the annular workpiece, that is, Figure 4The cross section at ΦA in the middle comprises a positioning mechanism 1 and a measuring mechanism 2, the measuring mechanism 2 is detachably mounted on the positioning mechanism 1, the positioning mechanism 1 is used to contact the end face of the workpiece 3 and position the measuring mechanism 2 to a specified position, the measuring mechanism 2 comprises a measuring unit 21 and a measuring seat 22, the central axis of the measuring seat 22 is arranged at an angle to the positioning mechanism 1, the measuring seat 22 is fixed to the positioning mechanism 1 by a combination of screws and pins, a measuring end and a detection end are provided on the measuring unit 21, the end face of the measuring end is used to abut and contact with the measured inner conical surface of the workpiece 3, a mounting hole 221 is provided on the measuring seat 22 along the direction of its central axis, the measuring unit 21 is slidably mounted in the mounting hole 221, a reference hole 223 is further provided on the measuring seat 22, the center line of the reference hole 223 intersects the center line of the workpiece 3 perpendicularly, and a step surface 222 formed by two planes with different surface heights is further provided on the end face of the measuring seat 22 away from the measuring end, and whether the distance from the cross section to the end face at the inner conical surface of the annular member is qualified is judged by the positional relationship between the end face of the detection end and the two step surfaces 222.

[0031] The measuring tool for inspecting the distance from the cross section to the end face at the inner conical surface of the annular part of the present embodiment is a tool for inspecting the distance from the cross section to the end face at a specified diameter of an annular workpiece containing an inner conical surface inside. The measuring tool is fixed at the position to be measured of the workpiece through a positioning mechanism 1, and then the measuring unit 21 of the measuring mechanism 2 slides in the mounting hole 221 so that the measuring end of the measuring unit 21 contacts the inner conical surface to be measured. By observing the position of the detection end of the measuring unit 21 in the mounting hole 221 and the relative position relationship with the orifice of the mounting hole 221, it can be quickly judged whether the workpiece 3 is qualified. If the position of the detection end of the measuring unit 21 is between the step surfaces 222, the workpiece 3 is qualified; if the detection end of the measuring unit 21 extends out of the step surface 222 or does not reach the step surface 2 22, the workpiece 3 is unqualified, which can ensure that the detection time of the qualified rate of the workpiece 3 is short and the efficiency is high. Moreover, since the measuring tool is used for judgment, it is only required that the operator can use the measuring tool, and the technical requirements for the operator are greatly reduced, and novices can also achieve a high detection accuracy. In addition, the measuring tool of this embodiment only includes two parts, the positioning mechanism 1 and the measuring mechanism 2, and the measuring mechanism 2 also includes only two parts, the measuring seat 22 and the measuring unit 21. The structure is relatively simple, the operation process is also relatively simple, and the manufacturing cost and the inspection cost are both low. At the same time, the present invention is small in size and light, and can be used in a variety of occasions. Moreover, by changing the position and shape of the measuring unit 2, it can be applied to annular workpieces with more complex structures containing inner cones, and has a wide range of applications.

[0032] In this embodiment, the positioning mechanism 1 includes a positioning plate 11 and a positioning pin 12 disposed on the positioning plate 11 for contacting the outer circle of the workpiece 3. The positioning pin 12 is mounted on the positioning plate 11 through a positioning hole and a screw. The positioning plate 11 is provided with a mounting groove 111. The measuring seat 22 is detachably mounted on the mounting groove 111. The measuring end and the detection end of the measuring unit 21 are respectively located on both sides of the mounting groove 111. The structure of the positioning mechanism 1 is very simple, and it is relatively time-saving to manufacture, and the manufacturing cost is also low.

[0033] In this embodiment, the positioning plate 11 is a square plate, the number of the positioning pins 12 is two, the two positioning pins 12 are respectively arranged at the two ends of the positioning plate 11 in the length direction, the positioning pin 12 and the mounting groove 111 are respectively arranged at the two ends of the positioning plate 11 in the width direction, and the longitudinal distance E from the center of the positioning pin 12 to the reference hole 223 is equal to ((B+D) 2 / 4-F 2 ) 1 / 2 , where B is the outer diameter of the workpiece, D is the diameter of the positioning pin 12, and F is the distance between the center line of the installation slot 111 in the length direction and the two positioning pins 12. The three dimensions E, F, and D are used to ensure that the center line intersects with the center line of the workpiece 3 and thus ensure that the detection end of the measuring unit 21 can contact the central section of the workpiece 3. The above formula provides requirements and guidance for the design dimensions of the positioning plate 11 and the positioning pin 12, so that the manufactured positioning plate 11 meets the inspection requirements of the measuring tool.

[0034] In this embodiment, the positioning mechanism 1 is provided with an operating part 13 for operating the positioning mechanism 1 to position and install it on the workpiece. The operating part 13 can be an operating hole set on the positioning plate 11. The finger can be inserted into the operating hole to pick up the positioning mechanism 1 to the specified position, and the position of the positioning mechanism 1 can be further stabilized through the operating hole. The operating hole can also play a role in weight reduction, which can reduce the weight of the positioning mechanism 1 and reduce the load when using the positioning mechanism 1. The operating part 13 can also be an operating block or an operating armrest or other similar structures. The existence of the operating part 13 is mainly to facilitate the taking of the positioning mechanism 1.

[0035] In this embodiment, the measuring unit 21 includes a measuring pin 211 slidably installed in the mounting hole 221 and a control part 212 for controlling the sliding of the measuring pin 211 in the mounting hole. A control hole 224 is provided on the measuring seat 22 for the control part 212 to move. The outer diameter of the measuring pin 211 is clearance-matched with the mounting hole 221. One end of the control part 212 is fixed to the measuring pin 211, and the other end of the control part 212 passes through the measuring seat 22 from the control hole 224. The measuring unit 21 with the above structure has a simple structure and is easy to operate. Only by turning the control part 212 can the measuring pin 211 slide in the mounting hole 221. It is easy to operate and very time-saving.

[0036] As shown in Figure 1, in this embodiment, the measuring seat 22 can be a frame body similar to an X-shaped structure, wherein the first side of the X-shaped structure is a straight structure, which is fixed to the edge of the width direction of the surface of one side of the positioning plate 11 by a combination of screws and pins along the length direction of the positioning plate 11, the second side of the X-shaped structure passes through the mounting groove 111, and the two ends are respectively located on two opposite sides of the positioning plate 11, the mounting hole 221 is located in the second side, the first side of the X-shaped structure and one end of the second side are located on the same side, and the end of the second side on the same side as the first side includes three turning surfaces, wherein the step surface 222 is located on one of the turning surfaces, the control unit 212 is located on another turning surface, and the remaining turning surface is perpendicular to the first side, and the turning surface where the step surface 222 is located is adjacent to the turning surface where the control unit 212 is located, so that the relative position between the end face of the detection end of the measuring pin 211 and the step surface 222 can be observed after the control unit 212 contacts the measured inner cone surface of the workpiece 3 to judge whether the workpiece is qualified. The measuring seat structure of this embodiment has high balance and high reliability.

[0037] In this embodiment, the measuring pin 211 includes a ball head end that contacts the measured inner conical surface of the workpiece 3 and a judgment end for judging whether the workpiece 3 is qualified. The ball head end is the measuring end of the measuring unit 21, and the judgment end is the detection end of the measuring unit 21. The end face of the ball head end is a spherical structure, and the spherical structure can better contact the measured inner conical surface of the workpiece 3 to ensure high detection accuracy. The end face of the judgment end is a plane structure, and the end face of the judgment end is parallel to the two planes of the step surface 222, which is convenient for judging whether the end face of the judgment end is at the step surface 222, which is conducive to reducing judgment errors.

[0038] like Figure 2 and Figure 4 In this embodiment, the height difference of the step surface 222 is equal to L2-L1, where L2=(G+H2)*cosα+(A / 2)*sinα, L1=(G+H1)*cosα+(A / 2)*sinα, in the above formulas: G is the distance value from the reference hole 223 to the support surface formed by the contact between the positioning mechanism 1 and the end face of the workpiece 3, H1 is the minimum value from the specified diameter section of the workpiece 3 to the end face of the workpiece 3, H2 is the maximum value from the specified diameter section of the workpiece 3 (the section at ΦA) to the end face of the workpiece 3, A is the diameter value at the specified diameter, α is equal to 90° minus the slope value of the measured inner cone surface of the workpiece 3, and the above-mentioned values ​​of G and J can be adjusted according to the specific structural interference conditions of the workpiece 3. The allowable range value of the distance from the specified diameter section of the workpiece 3 to the end face of the workpiece 3 is converted into the height difference of the step surface 222. Through the conversion, the distance from the specified diameter section of the workpiece 3 to the end face of the workpiece 3, which is inconvenient to measure, can be turned into a range value that can be judged by the naked eye, which can greatly reduce the inspection difficulty of the workpiece 3 and help improve the inspection accuracy.

[0039] In this embodiment, the center line of the measuring end and the detection end of the measuring unit 21 intersects with the outer circle axis of the workpiece 3, and the angle between the two is equal to α, which is also equal to 90° minus the slope value of the measured inner cone surface of the workpiece 3, ensuring that the accuracy of the workpiece inspection by the measuring unit 21 is high.

[0040] In this embodiment, the radial dimension of the measuring end of the measuring unit 21 gradually decreases from the middle to the end, so that the measuring end of the measuring unit 21 can penetrate into the workpiece 3 to reach the diameter section.

[0041] The method for inspecting the distance from the cross section to the end face at the inner conical surface of the annular component of the present embodiment comprises the distance inspection tool from the cross section to the end face at the inner conical surface of the annular component of claims 1 to 8, and comprises the following steps:

[0042] S1, place the positioning mechanism 1 close to the end surface of the workpiece 3, and make the end surface of the measuring end of the measuring unit 21 contact with the measured inner conical surface of the workpiece 3, and observe the relative position between the detection end of the measuring unit 21 and the step surface 222;

[0043] S2. If the detection end of the measuring unit 21 is between the step surfaces 222, the workpiece is qualified; if the detection end of the measuring unit 21 extends out of the step surface 222 or does not reach the step surface 222, the workpiece is unqualified.

[0044] The inspection process of the distance from the cross section to the end face of the inner conical surface of the ring part of this embodiment is very simple. The measuring tool is fixed at the position to be measured of the workpiece by the positioning mechanism 1, and then the measuring unit 21 of the measuring mechanism 2 slides in the mounting hole 221, so that the measuring end of the measuring unit 21 contacts the inner conical surface to be measured. By observing the position of the detection end of the measuring unit 21 in the mounting hole 221 and the relative position relationship between the detection end and the orifice of the mounting hole 221, it can be quickly judged whether the workpiece is qualified. If the detection end of the measuring unit 21 is located between the step surfaces 222, the workpiece is qualified. If the detection end of the measuring unit 21 extends out of the step surface 222 or does not reach the step surface 222, the workpiece 3 is unqualified, which can ensure that the detection time of the qualified rate of the workpiece 3 is short, and it takes no more than 10 seconds to detect whether a workpiece 3 is qualified. The detection efficiency is high, and because the measuring tool is used for judgment, it is only required that the operator can use the measuring tool, and the technical requirements for the operator are greatly reduced. A novice can also achieve a high detection accuracy rate. The method of the present invention has been used in our company for many years and has been applied to multiple similar workpieces. It has high efficiency and a very stable structure.

[0045] In this embodiment, the workpiece 3 is always installed on the machine tool during inspection, and there is no need to remove the workpiece 3 from the machine tool, which can further save inspection time, reduce inspection procedures, and help improve inspection efficiency.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A measuring tool for testing the distance from the cross section to the end face at the inner conical surface of a ring part, which is used to test the distance from the cross section to the end face of a ring workpiece containing an inner conical surface at a specified diameter, wherein the inner conical surface refers to the conical surface area between two annular flanges arranged at an angle in the inner cavity of the ring workpiece, and the specified diameter cross section is the cross section located at the inner conical surface to be measured, characterized in that: The invention comprises a positioning mechanism (1) and a measuring mechanism (2), wherein the measuring mechanism (2) is detachably mounted on the positioning mechanism (1), and the positioning mechanism (1) is used to contact the end surface of a workpiece (3) and position the measuring mechanism (2) at a specified position. The measuring mechanism (2) comprises a measuring unit (21) and a measuring seat (22), wherein the central axis of the measuring seat (22) is arranged at an angle to the positioning mechanism (1), and the measuring unit (21) is provided with a measuring end and a detection end, wherein the end face of the measuring end is used to abut against the measured inner conical surface of the workpiece (3). The measuring seat (22) is provided with a mounting hole (221) opened along the central axis direction thereof, the measuring unit (21) is slidably mounted in the mounting hole (221), and the measuring seat (22) is also provided with a reference hole (223), the center line of the reference hole (223) intersecting the center line of the workpiece (3) perpendicularly. The end surface of the measuring seat (22) away from the measuring end is also provided with two stepped surfaces (222) formed by planes with different surface heights, and the positional relationship between the end surface of the detection end and the two stepped surfaces (222) is used to judge whether the distance from the cross section to the end surface at the inner conical surface of the annular part is qualified; The positioning mechanism (1) comprises a positioning plate (11) and a positioning pin (12) arranged on the positioning plate (11) for contacting the outer circle of a workpiece (3); the positioning plate (11) is provided with a mounting groove (111); the measuring seat (22) is detachably mounted on the mounting groove (111); and the measuring end and the detection end of the measuring unit (21) are respectively located on two sides of the mounting groove (111); The positioning plate (11) is a polygonal plate. The number of the positioning pins (12) is two. The two positioning pins (12) are respectively arranged at two ends of the positioning plate (11) in the length direction. The positioning pins (12) and the mounting grooves (111) are respectively arranged at two ends of the positioning plate (11) in the width direction. The longitudinal distance E from the center of the positioning pin (12) to the reference hole (223) is (B+D) 2 / 4-F 2 ) 1 / 2 , wherein B is the outer diameter of the workpiece, D is the diameter of the positioning pin (12), and F is the lateral distance from the center of the positioning pin to the center line of the mounting hole (221). The three dimensions E, F, and D are used to ensure that the center line of the measuring unit (21) intersects with the center line of the workpiece (3) and thus ensure that the detection end can contact the central cross section of the workpiece (3); The measuring unit (21) comprises a measuring pin (211) slidably mounted in a mounting hole (221) and a control portion (212) for controlling the sliding movement of the measuring pin (211) in the mounting hole; the measuring seat (22) is provided with a control hole (224) for the control portion (212) to move; one end of the control portion (212) is fixed to the measuring pin (211), and the other end of the control portion (212) passes through the control hole (224) and out of the measuring seat (22); The height difference of the step surface (222) is equal to L2-L1, where L2=(G+H2) cosα+(A / 2) sinα,L1=(G+H1) cosα+(A / 2) sinα, in the above formula: G is the distance value from the reference hole (223) to the supporting surface formed by the contact between the positioning mechanism (1) and the end face of the workpiece (3), H1 is the minimum value from the specified diameter section of the workpiece (3) to the end face of the workpiece (3), H2 is the maximum value from the specified diameter section of the workpiece (3) to the end face of the workpiece (3), A is the diameter value at the specified diameter, and α is equal to 90° minus the slope value of the measured inner cone surface of the workpiece (3).

2. The measuring tool for testing the distance from the cross section to the end face of the inner conical surface of the ring according to claim 1, characterized in that: The positioning mechanism (1) is provided with an operating portion (13) used for positioning the positioning mechanism (1) and installing it on a workpiece.

3. The distance testing tool from the cross section to the end face of the inner conical surface of the ring according to claim 2, characterized in that: The measuring pin (211) comprises a ball head end that contacts the measured inner conical surface of the workpiece (3) and a judging end that is used to judge whether the workpiece (3) is qualified, the ball head end being the measuring end of the measuring unit (21), the judging end being the detection end of the measuring unit (21), the end face of the ball head end being a spherical structure, the end face of the judging end being a plane structure, and the end face of the judging end being parallel to two planes of the step surface (222).

4. The measuring tool for testing the distance from the cross section to the end face of the inner conical surface of the ring according to claim 2, characterized in that: The center line connecting the measuring end and the detection end of the measuring unit (21) intersects with the outer circular axis of the workpiece (3), and the angle between the two is equal to α.

5. A measuring tool for testing the distance from the cross section to the end face of the inner conical surface of a ring member according to any one of claims 1 to 4, characterized in that: The radial dimension of the measuring end of the measuring unit (21) gradually decreases from the middle to the end.

6. A method for inspecting the distance from the cross section to the end face at the inner conical surface of a ring part, characterized in that: The method comprises using a measuring tool for testing the distance from the cross section to the end face of the inner conical surface of a ring member according to any one of claims 1 to 5, and comprising the following steps: S1, placing the positioning mechanism (1) in close contact with the end face of the workpiece (3), and making the end face of the measuring end of the measuring unit (21) contact the measured inner conical surface of the workpiece (3), and observing the relative position between the detection end of the measuring unit (21) and the step surface (222); S2. If the detection end of the measuring unit (21) is between the step surfaces (222), the workpiece is qualified; if the detection end of the measuring unit (21) extends out of the step surface (222) or does not reach the step surface (222), the workpiece is unqualified.

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