Inner circular groove diameter measuring device and method

Abstract

The invention relates to a device and method for measuring the diameter of an inner circular groove, the device comprises a base, a fixed measuring rod, a movable measuring rod, an elastic adjusting mechanism, a measuring meter and a meter locking mechanism, the fixed measuring rod is fixedly installed on the base, and the fixed measuring rod comprises a fixed measuring head used for extending into the inner circular groove; the movable measuring rod is mounted on the base in a linear moving manner and comprises a movable measuring head used for extending into the inner circular groove; the elastic adjusting mechanism is installed on the base and connected with the fixed measuring rod, the elastic adjusting mechanism can adjust linear movement of the movable measuring rod to enable the movable measuring rod to be close to or far away from the fixed measuring rod, the elastic adjusting mechanism is provided with an elastic structure, and the elastic structure provides elastic force for driving the movable measuring rod to be far away from the fixed measuring rod; the measuring meter is mounted on the base, and a contact measuring head on a meter rod of the measuring meter is in direct or indirect contact with the movable measuring rod, so that the linear displacement of the movable measuring rod can be measured; and the meter locking mechanism is used for locking and fixing the measuring meter on the base.

Description

Technical Field

[0001] The present invention relates to the technical field of precision measuring devices for aviation parts, and in particular to a device and method for measuring the diameter of an inner circular groove, especially for measuring the diameter of an inner circular groove of a turbine seal honeycomb of an aviation engine. Background Art

[0002] In aircraft engines, annular honeycomb parts are mass-produced in large batches, with high processing frequency, large quantity and high dimensional accuracy. The honeycomb needs to be fine-machined after vacuum brazing. Precision machining is performed on a honeycomb grinder. Currently, a coaxial inner groove is provided on the inner surface of the honeycomb. See the attached Figure 6 and attached Figure 7 As shown, the method for measuring the diameter of the inner circular groove mainly adopts a special elbow caliper. However, due to the special structure of the inner circular groove on the inner circular surface, the caliper accuracy is not high, the probe is often misplaced, the measurement is difficult and the error is large, the measurement is inaccurate, and it is only suitable for measuring large tolerance dimensions. If you want to measure a precise dimension with an accuracy of less than 0.1mm, you need to measure it on a three-coordinate scale to ensure accurate dimension measurement. However, the three-coordinate point sampling and programming process is long, and it is necessary to be equipped with expensive special probes, resulting in low measurement efficiency and huge costs. At the same time, the three-coordinate measurement cannot be measured on the machine tool, which affects the operator's adjustment of the cutting allowance and the feed and retract, affecting the efficiency of processing to the optimal size of the part. Therefore, in order to improve the quality and efficiency of the parts, it is necessary to develop a device and method for high-precision diameter measurement of the inner circular groove of parts such as ring-type honeycombs to solve the problems of large measurement errors of special calipers, high efficiency and low cost of three-coordinate measurement, and inability to measure on a machine tool. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an inner circular groove diameter measuring device and method, which can conveniently, quickly and accurately measure the inner circular groove diameter indirectly, thereby improving measurement accuracy and work efficiency.

[0004] To achieve the above-mentioned objectives, the present invention provides an internal circular groove diameter measuring device, comprising a base, a fixed measuring rod, a movable measuring rod, an elastic adjustment mechanism, a measuring gauge and a gauge locking mechanism, wherein the fixed measuring rod is fixedly mounted on the base, the fixed measuring rod comprises a fixed measuring head for extending into the internal circular groove, and the fixed measuring head has a fixed measuring surface for contacting the bottom surface of the internal circular groove; the movable measuring rod is linearly movably mounted on the base, the movable measuring rod comprises a movable measuring head for extending into the internal circular groove, and the movable measuring head has a movable measuring surface for contacting the bottom surface of the internal circular groove; the elastic adjustment mechanism is mounted on the base and connected to the fixed measuring rod, the elastic adjustment mechanism can adjust the linear movement of the movable measuring rod so that the movable measuring rod approaches or moves away from the fixed measuring rod, the elastic adjustment mechanism has an elastic structure, and the elastic structure provides an elastic force that drives the movable measuring rod away from the fixed measuring rod; the measuring gauge is mounted on the base, and the contact measuring head on its gauge rod directly or indirectly contacts the movable measuring rod, and can measure the linear displacement of the movable measuring rod; the gauge locking mechanism is used to lock the measuring gauge to the base.

[0005] Furthermore, the elastic adjustment mechanism includes a slide plate that can be linearly movably installed on the base, the elastic structure includes a spring connecting the slide plate and the base, the movable measuring rod is fixedly connected to the slide plate, and when the slide plate moves linearly toward the movable measuring rod, the spring is in an elastic energy storage state, and its elastic force drives the slide plate away from the fixed measuring rod; the contact probe of the measuring meter contacts the slide plate.

[0006] Furthermore, it also includes a guide mechanism, which includes guide rails respectively arranged on both sides of the slide along a direction perpendicular to the linear movement direction of the slide, and balls arranged between the guide rails and the slide.

[0007] Furthermore, the position of the guide rail on at least one side of the slide is adjustable in a direction perpendicular to the linear moving direction of the slide.

[0008] Furthermore, a strip groove extending linearly along the linear moving direction of the movable measuring rod is provided on the base, and the fixed measuring rod is located in the strip groove and fixed to the base by a locking nut.

[0009] Furthermore, the base includes a meter mounting block, a through hole is provided in the meter mounting block, the meter rod of the measuring meter is installed in the through hole of the meter mounting block, and the meter locking mechanism includes a locking bolt screwed to the meter mounting block, one end of the locking bolt extends into the through hole and abuts against the meter rod.

[0010] Furthermore, the measuring gauge is a dial gauge.

[0011] The present invention also provides a method for measuring the diameter of an inner circular groove, which is performed using the inner circular groove diameter measuring device described above and comprises the following steps:

[0012] S1. Calibration measurement benchmark:

[0013] S11, manufacturing a surface alignment member, wherein the surface alignment member has two opposing surfaces, and the distance between the two surfaces is equal to the designed diameter D of the inner circular groove to be measured;

[0014] S12. Assemble and adjust the inner groove diameter measuring device according to the counter surface of the counter component; bring the fixed measuring surface on the fixed measuring rod and the movable measuring surface on the movable measuring rod into contact with the two counter surfaces, respectively, and ensure that the elastic structure is in an elastic energy storage state; after the contact probe of the measuring instrument directly or indirectly contacts the movable measuring rod, record the reading a.

[0015] S2. Measurement work:

[0016] S21. Mounting an internal groove diameter measuring device on the part to be measured, moving a movable measuring rod of the internal groove diameter measuring device so that the distance between the movable measuring surface and the fixed measuring surface of the fixed measuring rod is less than the diameter of the internal surface of the part to be measured where the internal groove to be measured is located; then extending the movable and fixed measuring heads into the internal surface, inserting the fixed measuring head into the internal groove to be measured, releasing the movable measuring rod, and allowing the elastic adjustment mechanism to push the movable measuring rod, allowing the movable measuring head to enter the internal groove;

[0017] S22. After the movable measuring surface and the fixed measuring surface are in contact with two opposite locations of the inner circular groove to be measured, read the degree b of the measuring table; based on the readings a and b, determine the difference △ between the diameter of the inner circular groove to be measured and the design diameter D, and determine the diameter of the inner circular groove to be measured.

[0018] Furthermore, in step S12, the inner groove diameter measuring device is moved to perform multiple calibrations, and the reading a is recorded after the error is no more than 0.002 mm.

[0019] Furthermore, in step S12, when the elastic structure of the elastic adjustment mechanism is in a natural state, the difference between the distance between the fixed measuring surface and the movable measuring surface and the designed diameter D is X, and X is 0.08-0.12 mm.

[0020] As described above, the inner groove diameter measuring device and method according to the present invention have the following beneficial effects:

[0021] After precise measurement and alignment on a standard-sized alignment part, the size of the measured object can be indirectly calculated. The measurement work is convenient, and the diameter value of the inner circular groove can be obtained quickly, intuitively, and accurately. It can measure the actual situation of various ring parts of multiple models, eliminating the waiting time during the measurement process, which can significantly improve measurement efficiency and production progress. Because the measuring device can measure on machine tools and can measure multiple points of annular groove products, the product's first-time processing pass rate can be increased, effectively improving the product's pass rate and quality. The inner circular groove diameter measuring device has a simple structure and is easy to use. The spring can ensure that the movable probe and the fixed probe are in close contact with the inner circular groove at two opposite points, ensuring measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the inner circular groove diameter measuring device of the present invention.

[0023] Figure 2 It is a side view schematic diagram of the inner groove diameter measuring device of the present invention.

[0024] Figure 3 It is a schematic top view of the inner groove diameter measuring device of the present invention.

[0025] Figure 4 It is a partial cross-sectional view of the guide mechanism in the present invention.

[0026] Figure 5 It is a structural diagram of the watch element in the present invention.

[0027] Figure 6 It is a structural schematic diagram of the tested part in the present invention.

[0028] Figure 7 for Figure 6 AA section view in.

[0029] Figure 8 The figure is a schematic diagram of the inner groove diameter measuring device of the present invention for calibrating the measurement reference on a counterpiece.

[0030] Figure 9 The figure is a schematic diagram of the working process of the inner groove diameter measuring device of the present invention for measuring an inner groove.

[0031] Explanation of Figure Numbers

[0032] 1 base

[0033] 11 strip slots

[0034] 12-meter mounting block

[0035] 121 through hole

[0036] 13 side panels

[0037] 14 Limit bolt

[0038] 2 Fix the measuring rod

[0039] 21 Fixed probe

[0040] 211 Fixed measuring surface

[0041] 3 movable measuring rod

[0042] 31 movable probe

[0043] 311 Active measuring surface

[0044] 4 Elastic adjustment mechanism

[0045] 41 Skateboard

[0046] 42 Spring

[0047] 43 Toggle nut

[0048] 5. Guide mechanism

[0049] 51 guide rails

[0050] 52 Ball

[0051] 53 Adjusting the support plate

[0052] 54 Guide rail adjustment bolt

[0053] 6 Measuring table

[0054] 61 meter rod

[0055] 62 contact probe

[0056] 7 Locking bolt

[0057] 8 Lock nut

[0058] 9 pairs of watches

[0059] 91 pairs of surfaces

[0060] 10 Parts under test

[0061] 101 Honeycomb

[0062] 102 inner groove DETAILED DESCRIPTION

[0063] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0065] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0066] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0067] like Figures 1 to 9As shown, the present invention provides an inner groove diameter measuring device, comprising a base 1, a fixed measuring rod 2, a movable measuring rod 3, an elastic adjustment mechanism 4, a measuring gauge 6 and a gauge locking mechanism, wherein the fixed measuring rod 2 is fixedly mounted on the base 1, and the fixed measuring rod 2 includes a fixed measuring head 21 for extending into the inner groove 102, and the fixed measuring head 21 has a fixed measuring surface 211 for contacting the bottom surface of the inner groove 102; the movable measuring rod 3 is linearly movably mounted on the base 1, and the movable measuring rod 3 includes a movable measuring head 31 for extending into the inner groove 102, and the movable measuring head 31 has a fixed measuring surface 211 for contacting the bottom surface of the inner groove 102. 2. The bottom surface of the groove contacts the movable measuring surface 311; the elastic adjustment mechanism 4 is installed on the base 1 and is connected to the fixed measuring rod 2. The elastic adjustment mechanism 4 can adjust the linear movement of the movable measuring rod 3 so that the movable measuring rod 3 is close to or away from the fixed measuring rod 2. The elastic adjustment mechanism 4 has an elastic structure, and the elastic structure provides an elastic force to drive the movable measuring rod 3 away from the fixed measuring rod 2; the measuring meter 6 is installed on the base 1, and the contact probe 62 on its meter rod 61 is in direct or indirect contact with the movable measuring rod 3, and can measure the linear displacement of the movable measuring rod 3; the meter locking mechanism is used to lock the measuring meter 6 to the base 1.

[0068] The internal groove diameter measuring device of the present invention is used to extend the fixed measuring rod 2 and the movable measuring rod 3 into the inner circular hole of the inner circular groove 102 of the measured part 10. Since the position of the movable measuring rod 3 is adjustable, the elastic adjustment mechanism 4 is used to move the movable measuring rod 3 closer to the fixed measuring rod 2 before entering. Specifically, the distance L between the movable measuring surface 311 and the fixed measuring surface 211 is made smaller than the diameter d of the inner circular hole. Figure 2 、 Figure 7 and Figure 9 As shown, at this time, the elastic structure of the elastic adjustment mechanism 4 is in an elastic energy storage state, providing corresponding elastic recovery ability. After the fixed probe 21 is inserted into the inner circular groove 102, the movable measuring rod 3 is released. Under the elastic force of the elastic structure, the elastic adjustment mechanism 4 drives the movable measuring rod 3 to move linearly until it is inserted into the inner circular groove 102, and under the action of the elastic force, it can ensure that the fixed measuring surface 211 and the movable measuring surface can stably contact the inner circular groove 102 at two relative points about its center, and then measure the displacement of the movable measuring rod 3 through the measuring table 6. Then, by comparing with the standard parts, the diameter of the inner circular groove 102 can be measured.

[0069] like Figures 1 to 9 As shown, the inner groove diameter measuring device of the present invention is further described below with a specific embodiment:

[0070] In this embodiment, if Figure 1 、 Figure 2 and Figure 3As shown, as a preferred design, the fixed stylus 21 of the fixed stylus rod 2 and the movable stylus 31 of the movable stylus rod 3 are both cylindrical, with a thickness K less than the width of the inner circular groove 102, to ensure smooth insertion into the inner circular groove 102. A portion of the cylindrical surface of the movable stylus 31 constitutes a movable measuring surface 311, whose diameter is much smaller than the diameter of the inner circular groove 102 to be measured, and the two are in linear contact. In addition, the dimension of the movable stylus 31 extending from the rod (i.e., the difference between the radius of the movable stylus 31 and the radius of the rod) is greater than the depth of the inner circular groove 102, thereby ensuring that the movable measuring surface 311 can smoothly and stably contact the bottom surface of the inner circular groove 102 without interference. A portion of the cylindrical surface of the fixed probe 21 forms a fixed measuring surface 211, whose diameter is also much smaller than the diameter of the inner circular groove 102 to be measured. Furthermore, the length of the fixed probe 21 extending beyond the rod (i.e., the difference between the radius of the fixed probe 21 and the radius of the rod) is greater than the depth of the inner circular groove 102, thereby ensuring that the fixed measuring surface 211 can smoothly and stably contact the bottom surface of the inner circular groove 102. The distance H between the fixed probe 21 and the movable probe 31 and the bottom surface of the base 1 is greater than the distance h between the inner circular groove 102 and the end surface of the inner circular hole in which they are located, ensuring that the fixed probe 21 and the movable probe 31 can smoothly extend from the end surface of the inner circular hole into the inner circular groove 102. In addition, when the part 10 to be measured is a ring-shaped honeycomb component, the inner circular groove 102 is located in the honeycomb 101. At this time, the thickness of the fixed probe 21 and the movable probe 31 should be greater than the size of a single honeycomb 101 hole, approximately equal to twice the size of the honeycomb 101 hole, so that the probe contacts the edge of the honeycomb 101 hole, which can prevent the probe from sinking into the honeycomb 101 hole and causing measurement errors.

[0071] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, as a preferred design, a positioning plane is provided on the bottom surface of the base 1. The linear movement direction of the slide 41 and the movable measuring rod 3 is parallel to the positioning plane. When in use, the inner groove diameter measuring device is placed on the end surface of the inner circular surface where the inner circular groove 102 is located, and the positioning plane on the bottom of the base 1 is pressed against the end surface of the inner circular surface to ensure stability. After the base 1 is positioned, the movable measuring rod 3 moves radially along the inner circular groove 102. The movable measuring rod 3 is parallel to the fixed measuring rod 2.

[0072] In this embodiment, if Figure 1 、 Figure 2 and Figure 3As shown, as a preferred design, the elastic adjustment mechanism 4 includes a slide plate 41 that is linearly movable and mounted on the base 1. The elastic structure includes a spring 42 connecting the slide plate 41 and the base 1, wherein the spring 42 is a compression spring. The movable measuring rod 3 is fixedly connected to the slide plate 41. When the slide plate 41 moves linearly toward the fixed measuring rod 2, the spring 42 is compressed and is in an elastic energy storage state. Its elastic force drives the slide plate 41 away from the fixed measuring rod 2. The contact probe 62 of the measuring table 6 contacts the slide plate 41 and indirectly contacts the movable measuring rod 3 through the slide plate 41, thereby indirectly obtaining the displacement of the movable measuring rod 3. Furthermore, the upper end of the movable measuring rod 3 passes through the slide plate 41, and a toggle nut 43 is screwed onto it. The toggle nut 43 presses the movable measuring rod 3 to the slide plate 41. The toggle nut 43 also facilitates the movement of the slide plate 41 and the movable measuring rod 3. In other embodiments, the elastic adjustment mechanism 4 can also adopt other suitable structures as long as they can achieve the above functions.

[0073] In this embodiment, if Figure 1 、 Figure 3 and Figure 4 As shown, further, the inner groove diameter measuring device also includes a guide mechanism 5 for stably guiding the linear movement of the slide 41. The guide mechanism 5 includes guide rails 51 respectively arranged on both sides of the slide 41 along a direction perpendicular to the linear movement direction of the slide 41, and balls 52 arranged between the guide rails 51 and the slide 41. V-grooves are provided on the sides of the guide rails 51 and the slide 41. The balls 52 are located in the V-grooves, and friction can be reduced by the rolling of the balls 52. Furthermore, the guide rail 51 on one side of the slide 41 is fixedly mounted on the base 1, and the guide rail 51 on the other side is adjustable in position along a direction perpendicular to the linear movement direction of the slide 41, and an adjustment support plate 53 and a guide rail adjustment bolt 54 are provided to adjust and fix the movable guide rail 51. The adjustment support plate 53 is fixed to the base 1, and the guide rail adjustment bolt 54 is screwed to the adjustment support plate 53, and its inner end is screwed to the outer side surface of the movable guide rail 51. By rotating the guide rail adjustment bolt 54, the tightness gap between the guide rail 51 and the slide 41 can be adjusted to ensure that the slide 41 can move freely without excess gap. The guide rail 51 and the slide 41 are both made of CrWMn material, which requires heat treatment to HRC58-62 to improve wear resistance. Through this guide mechanism 5, the movement friction can be effectively reduced, it is easy to use, the structural stability is high, and the measurement accuracy and reliability are effectively improved. In other embodiments, the guide mechanism 5 can also adopt other existing suitable structures.

[0074] In this embodiment, if Figure 1 、 Figure 2 and Figure 3As shown, as a preferred design, base 1 is provided with a strip groove 11 extending in the linear direction of movement of movable measuring rod 3. Fixed measuring rod 2 is positioned within strip groove 11 and secured to base 1 via a locking nut 8. Specifically, locking nut 8 is threaded onto fixed measuring rod 2 and presses against the upper end surface of base 1. The rod portion of fixed measuring rod 2 is provided with a stepped surface that abuts against the lower end surface of base 1. After loosening locking nut 8, the position of fixed measuring rod 2 within strip groove 11 can be adjusted, and then locking nut 8 can be tightened again, allowing the position of fixed measuring rod 2 to be flexibly adjusted as needed.

[0075] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, as a preferred design, the base 1 includes a side plate 13, in which a limiting bolt 14 is screwed. One end of the limiting bolt 14 abuts against the slide 41, and the limiting bolt 14 can limit the position of the slide 41 when it moves toward the fixed measuring rod 2.

[0076] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, as a preferred design, the base 1 includes a meter mounting block 12, which is provided with a through hole 121. The meter rod 61 of the measuring meter 6 is mounted in the through hole 121 of the meter mounting block 12. The meter locking mechanism includes a locking bolt 7 screwed to the meter mounting block 12. One end of the locking bolt 7 extends into the through hole 121 and abuts against the meter rod 61. The through hole 121 is preferably further provided with a linear bearing, and the meter rod 61 is mounted in the linear bearing to ensure its stable linear movement.

[0077] In this embodiment, if Figure 1 、 Figure 2 and Figure 3 As shown, as a preferred design, the measuring gauge 6 adopts a micrometer. Under other accuracy requirements, a dial indicator or other measuring gauges 6 can also be used.

[0078] The present invention also provides a method for measuring the diameter of an inner circular groove, which is performed using the inner circular groove diameter measuring device of the present invention, and includes the following steps:

[0079] S1. Calibration measurement benchmark:

[0080] S11 , manufacturing a counter-measurement member 9 , wherein the counter-measurement member 9 has two counter-measurement surfaces 91 arranged opposite to each other, and a distance between the two counter-measurement surfaces 91 is equal to a designed diameter D of the inner circular groove 102 to be measured.

[0081] Specifically, the design standard of the watch 9 is as follows Figure 5As shown, the two counter surfaces 91 can be parallel planes separated by a distance equal to the design diameter D. Alternatively, the two counter surfaces 91 can be localized regions on the same annular surface, that is, arc-shaped surfaces. During use, the diameter of the two arc-shaped counter surfaces 91 is D. The points of contact between the arc-shaped counter surfaces 91 and the inner groove diameter measuring device are always symmetrical about the center of the circle, so the distance between them is equal to diameter D. Precision grinding and other processes are used to fine-tune the counter surface 91, ensuring high-precision form and position tolerances of 0.005° for the spacing dimension "D," 0.005° for perpendicularity, and 0.003° for parallelism, thereby reducing alignment errors. Furthermore, imported precision three-dimensional coordinate measuring equipment can be used to accurately measure the spacing dimension "D" 100% of the time, and the measured value is printed on a prominent location on the counter surface 9 for easy viewing. The counter surface 91 of the comparison piece is made of CrWMn and requires heat treatment to HRC58-62 for improved wear resistance. Preferably, the positions of the two opposing surfaces 91 are adjustable, and the distance between the two opposing surfaces 91 is adjusted according to actual measurement needs.

[0082] S12. Assemble and adjust the inner groove diameter measuring device according to the counter surface 91 of the counter watch 9; make the fixed measuring surface 211 on the fixed measuring rod 2 and the movable measuring surface 311 on the movable measuring rod 3 contact the opposite sides of the watch ring surface respectively, and ensure that the elastic structure is in an elastic energy storage state at this time; after the contact probe 62 of the measuring watch 6 directly or indirectly contacts the movable measuring rod 3, record its reading a.

[0083] Specifically in this embodiment, Figure 5As shown, by adjusting the position of fixed measuring rod 2 so that, when movable measuring head 31 is not moved (i.e., spring 42 is naturally extended), the difference between the distance L between fixed measuring surface 211 and movable measuring surface 311 and the designed diameter D of inner groove 102 of measured part 10 is X, where X = LD, and the value of X is preferably in the range of 0.08 to 0.10 mm. Tighten locknut 8 to secure fixed measuring rod 2. Then, install measuring gauge 6, release its contact probe 62 from slide 41, and ensure that the dial indicator pointer is pressed in approximately 0.5-1 turn to obtain an appropriate reading. Then manually push the toggle nut 43 to drive the slide 41 and the movable probe 31 to move backward as a whole and approach the movable measuring rod 3, until the distance L between the fixed measuring surface 211 and the movable measuring surface 311 is of appropriate size, and the fixed probe 21 and the movable probe 31 can be placed in the two opposing surfaces 91. After loosening the fluctuation nut, under the elastic force of the spring 42, the fixed measuring surface 211 and the movable measuring surface 311 are respectively in contact with the two opposing surfaces 91, and attention is paid to the close fit of the contact surfaces. When a feeler gauge of ≤0.01mm is used for detection at the contact surface, it should not pass, so as to ensure the fit and reduce the measurement error. Repeat many times to reach the same position, repeat the adjustment so that the reading error of the measuring table 6 is not greater than 0.002mm, and record the reading of the measuring table 6 at this time. At this time, it is preferably set to zero for the measuring table 6, that is, the reading a is zero at this time.

[0084] S2. Measurement work:

[0085] S21. Install the inner groove diameter measuring device on the part to be measured 10, move the movable measuring rod 3 of the inner groove diameter measuring device so that the distance between the movable measuring surface 311 and the fixed measuring surface 211 of the fixed measuring rod 2 is smaller than the diameter of the inner circular surface of the inner circular groove 102 to be measured in the part to be measured 10; then extend the movable measuring head 31 and the fixed measuring head 21 into the inner circular surface, insert the fixed measuring head 21 into the inner circular groove 102 to be measured, loosen the movable measuring rod 3, and the elastic adjustment mechanism 4 pushes the movable measuring rod 3 so that the movable measuring head 31 enters the inner circular groove 102.

[0086] Specifically in this embodiment, Figure 9 As shown, the part 10 to be measured is a ring-type honeycomb component in an aircraft engine, wherein the inner circular groove 102 to be measured is located in the honeycomb 101. When in use, the inner circular groove diameter measuring device is placed on the end face of the inner circular surface where the inner circular groove 102 is located, and the positioning plane at the bottom of the base 1 can be pressed against the end face of the inner circular surface to ensure stability.

[0087] S22, after the movable measuring surface 311 and the fixed measuring surface 211 are respectively in contact with two opposite points of the inner circular groove 102 to be measured, the degree b of the measuring gauge 6 is read; based on the readings a and b, the difference △ between the diameter of the inner circular groove 102 to be measured and the design diameter D is determined, and the diameter of the inner circular groove 102 to be measured is determined, that is, the diameter of the inner circular groove 102 of the measured part 10 = D (actual measured value of the standard counter gauge 9) + Δ (micrometer reading value), and the required size value is indirectly obtained through calculation.

[0088] When measuring the inner groove 102 of the measured part 10, the inner groove diameter measuring device can be used to perform multiple measurements to measure the diameter values ​​at different positions of the inner groove 102 to improve work efficiency and measurement accuracy.

[0089] The internal groove diameter measurement device and method of the present invention are universally applicable for measuring the precision internal groove diameters (102) of a variety of large-diameter annular metal parts, particularly annular honeycomb components used in aircraft engines. After cutting these components on a machine tool, the internal groove diameters (102) can be measured directly on the machine tool. The probe ensures that the measurement is not collapsed and parallel to the radial dimension, and measurements can be performed without disassembly on the machine tool, facilitating accurate measurement and adjustment of the required cutting depth.

[0090] The inner groove diameter measuring device and method of the present invention have the following beneficial effects:

[0091] After accurate measurement on the standard-sized alignment piece 9, the size of the measured object can be indirectly calculated. The measurement work is convenient, and the diameter value of the inner circular groove 102 can be obtained quickly, intuitively, and accurately. It can measure the actual situation of various ring-type parts of multiple models, eliminating the need to wait for the measurement process, and can significantly improve measurement efficiency and production progress. Because the measuring device can be used for measurement on machine tools and can measure multiple points of annular groove products, the product's one-time processing pass rate can be increased, effectively improving the product's pass rate and quality. The inner circular groove diameter measuring device has a simple structure and is easy to use. The spring 42 can ensure that the movable probe 31 and the fixed probe 21 are in close contact with the inner circular groove 102 at two relative locations, ensuring measurement accuracy.

[0092] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0093] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An inner groove diameter measuring device, characterized in that: The invention comprises a base (1), a fixed measuring rod (2), a movable measuring rod (3), an elastic adjustment mechanism (4), a measuring gauge (6) and a gauge locking mechanism, wherein the fixed measuring rod (2) is fixedly mounted on the base (1), the fixed measuring rod (2) comprises a fixed measuring head (21) for extending into the inner circular groove (102), and the fixed measuring head (21) has a fixed measuring surface (211) for contacting the bottom surface of the inner circular groove (102); the movable measuring rod (3) is linearly movably mounted on the base (1), the movable measuring rod (3) comprises a movable measuring head (31) for extending into the inner circular groove (102), and the movable measuring head (31) has a movable measuring surface (211) for contacting the bottom surface of the inner circular groove (102). The measuring surface (311) is provided with a measuring table (6) mounted on the base (1) and connected to the fixed measuring rod (2). The elastic adjustment mechanism (4) is capable of adjusting the linear movement of the movable measuring rod (3) so that the movable measuring rod (3) is close to or away from the fixed measuring rod (2). The elastic adjustment mechanism (4) has an elastic structure, and the elastic structure provides an elastic force for driving the movable measuring rod (3) away from the fixed measuring rod (2). The measuring table (6) is mounted on the base (1), and the contact probe (62) on the table rod (61) thereof is in direct or indirect contact with the movable measuring rod (3), so as to measure the linear displacement of the movable measuring rod (3). The table locking mechanism is used for locking and fixing the measuring table (6) to the base (1).

2. The inner groove diameter measuring device according to claim 1, characterized in that: The elastic adjustment mechanism (4) comprises a slide plate (41) which is linearly movable and mounted on the base (1); the elastic structure comprises a spring (42) connecting the slide plate (41) and the base (1); the movable measuring rod (3) is fixedly connected to the slide plate (41); when the slide plate (41) moves linearly toward the movable measuring rod (3), the spring (42) is in an elastic energy storage state, and its elastic force drives the slide plate (41) away from the fixed measuring rod (2); The contact probe (62) of the measuring table (6) contacts the slide plate (41).

3. The inner groove diameter measuring device according to claim 2, characterized in that: The invention also comprises a guide mechanism (5), wherein the guide mechanism (5) comprises guide rails (51) respectively arranged on both sides of the slide plate (41) along a direction perpendicular to the linear movement direction of the slide plate (41), and a ball bearing (52) arranged between the guide rails (51) and the slide plate (41).

4. The inner groove diameter measuring device according to claim 3, characterized in that: The position of the guide rail (51) on at least one side of the slide plate (41) is adjustable in a direction perpendicular to the linear moving direction of the slide plate (41).

5. The inner groove diameter measuring device according to claim 1, characterized in that: The base (1) is provided with a strip groove (11) extending in a straight line along the straight moving direction of the movable measuring rod (3); the fixed measuring rod (2) is located in the strip groove (11) and is fixed to the base (1) by a locking nut (8).

6. The inner groove diameter measuring device according to claim 1, characterized in that: The base (1) comprises a meter mounting block (12), a through hole (121) is provided in the meter mounting block (12), a meter rod (61) of the measuring meter (6) is mounted in the through hole (121) of the meter mounting block (12), and the meter locking mechanism comprises a locking bolt (7) screwed to the meter mounting block (12), one end of the locking bolt (7) extends into the through hole (121) and abuts against the meter rod (61).

7. The inner groove diameter measuring device according to claim 1, characterized in that: The measuring gauge (6) is a micrometer.

8. A method for measuring the diameter of an inner circular groove, characterized in that: The inner groove diameter measuring device according to any one of claims 1 to 5 is used, comprising the following steps: S1. Calibration measurement benchmark: S11, manufacturing a counter-measurement member (9), wherein the counter-measurement member (9) has two counter-measurement surfaces (91) arranged opposite to each other, and the distance between the two counter-measurement surfaces (91) is equal to the designed diameter D of the inner circular groove (102) to be measured; S12, assembling and adjusting the inner groove diameter measuring device according to the counter surface (91) of the counter gauge (9); bringing the fixed measuring surface (211) on the fixed measuring rod (2) and the movable measuring surface (311) on the movable measuring rod (3) into contact with the two counter surfaces (91) respectively, and ensuring that the elastic structure is in an elastic energy storage state at this time; after the contact probe (62) of the measuring gauge (6) is in direct or indirect contact with the movable measuring rod (3), recording the reading a; S2. Measurement work: S21, installing an inner groove diameter measuring device on a part (10) to be measured, moving a movable measuring rod (3) of the inner groove diameter measuring device so that the distance between the movable measuring surface (311) and the fixed measuring surface (211) of the fixed measuring rod (2) is smaller than the diameter of the inner surface of the inner groove (102) to be measured in the part (10) to be measured; then extending the movable measuring head (31) and the fixed measuring head (21) into the inner surface, inserting the fixed measuring rod (2) into the inner groove (102) to be measured, releasing the movable measuring rod (3), and pushing the movable measuring rod (3) with the elastic adjustment mechanism (4) so ​​that the movable measuring head (31) enters the inner groove (102); S22, after the movable measuring surface (311) and the fixed measuring surface (211) are respectively in contact with two opposite locations of the inner circular groove (102) to be measured, the degree b of the measuring meter (6) is read; based on the readings a and b, the difference △ between the diameter of the inner circular groove (102) to be measured and the designed diameter D is determined, and the diameter of the inner circular groove (102) to be measured is determined.

9. The method for measuring the inner groove diameter according to claim 8, characterized in that: In step S12, the inner groove diameter measuring device is moved to perform multiple calibrations, and the reading a is recorded after the error is no greater than 0.002 mm.

10. The method for measuring the inner groove diameter according to claim 8, characterized in that: In the step S12, when the elastic structure of the elastic adjustment mechanism (4) is in a natural state, the difference between the distance between the fixed measuring surface (211) and the movable measuring surface (311) and the designed diameter D is X, and X is 0.08-0.12 mm.

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