Orifice chamfer opening taper size measuring clamp and measuring method

Abstract

The invention discloses an orifice chamfer opening taper size measuring clamp and a measuring method, the orifice chamfer opening taper size measuring clamp comprises a measuring sleeve, a measuring rod is slidably arranged in the measuring sleeve, the measuring end of the measuring rod extends to the outside of the measuring sleeve and is coaxially provided with a measuring plug gauge, and the acting end of the measuring rod is located in the measuring sleeve. A dial indicator is arranged at the end, away from the measuring plug gauge, of the measuring sleeve, a measuring top of the dial indicator extends into the measuring sleeve, a reading amplifying device is arranged between the acting end of the measuring rod and the measuring top of the dial indicator, one end of the reading amplifying device abuts against the acting end of the measuring rod, and the other end of the reading amplifying device abuts against the measuring plug gauge. The other end of the reading amplification device abuts against the measuring top of the dial indicator. When the measuring plug gauge is inserted into the orifice, the moving stroke of the measuring rod can be amplified and displayed on the dial indicator, the accuracy of stroke reading is ensured, and the accuracy of a final orifice chamfer size calculation result is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe fixtures, and relates to a fixture and a method for measuring the taper size of a chamfered hole. Background Art

[0002] In order to ensure the quality, service life and assembly requirements of parts, more and more parts have made extremely strict requirements on the size difference of the chamfer of the hole. For example, the chamfer of the hole at the bearing mounting hole requires that the size difference of the chamfer at both ends be controlled within 0.05. Whether the chamfer size is qualified will directly affect whether the bearing can be effectively closed after assembly, thereby reducing the overall performance and service life of the product.

[0003] At present, various measuring instruments and equipment can accurately measure the actual value of the chamfer size, such as three-coordinate measuring instruments, imagers, through-and-stop plug gauges, etc., but these measurement methods cannot efficiently or accurately measure the actual value of the chamfer size. Although the three-coordinate measuring equipment can accurately measure the actual value of the chamfer size, in actual production, if the chamfer size of each part is measured by three-coordinate measuring, it will occupy a large amount of three-coordinate resources and delay the inspection time of other parts; at the same time, when the three-coordinate equipment is inspected, the part needs to be removed from the machine tool. If the chamfer size is detected to be unqualified, the part will be processed again. Repeated positioning will increase the risk of scrapping the part processing, and will also delay a lot of production time. There may even be clamping deviations, and the tool cannot be fed according to the original tool path. There may even be excessive tool marks, resulting in scrapped parts and increased production costs. The imager can also detect the actual value of the chamfer size of the hole, but when measuring, the burrs at the chamfer of the hole have a greater impact on the measured value, resulting in inaccurate measurement results. If the burrs at the chamfer are removed before measurement, the chamfer tip will be too smooth, affecting people's visual judgment, requiring high technical requirements for measurement personnel, inaccurate measurement results, and low measurement efficiency. At the same time, as the measurement time goes by, it will cause the measurement personnel to be tired, resulting in increasing volatility in the measurement results, which may cause qualified parts to be judged as unqualified and unqualified parts to be judged as qualified. More seriously, after the parts are assembled into products, the performance and life of the product will be greatly reduced. However, using the through-end plug gauge to measure can only ensure whether the chamfers at each location are qualified, but it cannot measure the actual value of the chamfer size and cannot compare the difference in the chamfer size at both ends. Although some products do not require the difference in the chamfer size at both ends, if this method is used for measurement, in actual use, due to the asymmetry of the chamfer, the wear of the two ends of the part hole may be different, affecting the product life and causing double losses in economy and reputation.

[0004] There are also structures in the prior art that measure the chamfer size by using a plug gauge and a dial indicator, but due to the small size of the chamfer, the final reading on the dial indicator is very small. When the chamfer size accuracy is required to be high, the accuracy of the chamfer size reading read by the traditional plug gauge and dial indicator is insufficient, resulting in errors in the final chamfer size calculation result.

[0005] Therefore, in view of the above-mentioned problems existing in the existing chamfering measuring devices, the present invention discloses a hole chamfering opening taper dimension measuring fixture and a measuring method. Summary of the invention

[0006] The purpose of the present invention is to provide a hole chamfer opening taper size measuring fixture and measuring method, which can magnify the moving stroke of the measuring rod and display it on the dial indicator when the measuring plug gauge is inserted into the hole, so as to ensure the accuracy of the stroke reading, and further ensure the accuracy of the final hole chamfer size calculation result.

[0007] The present invention is achieved through the following technical solutions:

[0008] A fixture for measuring the taper size of a chamfered hole, comprising a measuring sleeve, a measuring rod slidably arranged inside the measuring sleeve, a measuring end of the measuring rod extending to the outside of the measuring sleeve and coaxially arranged with a measuring plug gauge, an active end of the measuring rod located inside the measuring sleeve, a dial indicator arranged at the end of the measuring sleeve away from the measuring plug gauge, a measuring pin of the dial indicator extending to the inside of the measuring sleeve, a reading amplification device arranged between the active end of the measuring rod and the measuring pin of the dial indicator, one end of the reading amplification device abutting against the active end of the measuring rod, and the other end of the reading amplification device abutting against the measuring pin of the dial indicator.

[0009] Insert the measuring plug gauge into the orifice to be measured. At this time, the orifice chamfer acts on the measuring plug gauge, and then the measuring rod is driven to move through the measuring plug gauge. The stroke of the measuring rod acts on one end of the reading amplifying device, and the stroke is amplified by the reading amplifying device and acts on the measuring push rod of the dial indicator, and then the stroke can be amplified and displayed on the dial indicator. The actual stroke of the measuring plug gauge and the measuring rod can be calculated through the degree of the dial indicator and the stroke magnification of the reading amplifying device. The size value of the orifice chamfer can be calculated through the trigonometric relationship between the actual stroke and the angle of the orifice chamfer.

[0010] In order to better realize the present invention, further, the reading amplification device includes a first piston and a second piston, the first piston and the second piston are slidably arranged inside the measuring sleeve, the first piston abuts against the working end of the measuring rod, the second piston abuts against the measuring head of the dial indicator, and a flow channel is arranged between the first piston and the second piston, and the inner diameter of the flow channel is less than the diameter of the second piston and less than the diameter of the first piston.

[0011] In order to better realize the present invention, further, an adapter inner sleeve is provided inside the measuring sleeve, a first piston chamber is provided at one end of the adapter inner sleeve close to the measuring rod, a second piston chamber is provided at one end of the adapter inner sleeve close to the dial indicator, a first piston is slidably provided inside the first piston chamber, a second piston is slidably provided inside the second piston chamber, and the first piston chamber and the second piston chamber are connected through a flow channel.

[0012] In order to better implement the present invention, further, a first return spring is arranged between the first piston and an end of the first piston chamber away from the connecting rod, and a second return spring is arranged between the second piston and an end of the second piston chamber close to the dial indicator.

[0013] In order to better implement the present invention, further, a radial locking piece is provided on the side wall of the measuring sleeve at one end close to the dial indicator, and one end of the radial locking piece extends into the interior of the measuring sleeve and tightens and fixes the measuring head of the dial indicator.

[0014] In order to better implement the present invention, further, a bushing is provided between the outer side of the measuring head of the dial gauge and the inner wall of the measuring sleeve, and the end of the radial locking piece abuts against the outer side surface of the bushing.

[0015] In order to better implement the present invention, further, a measuring rod locking piece is provided on the side wall between the two ends of the measuring sleeve, and one end of the measuring rod locking piece extends into the interior of the measuring sleeve and abuts against the outer side surface of the measuring rod.

[0016] In order to better implement the present invention, further, a positioning plate is provided at one end of the measuring sleeve close to the measuring plug gauge, and a positioning end face is provided at one side of the positioning plate close to the measuring plug gauge, and the positioning end face is perpendicular to the axis of the measuring sleeve.

[0017] A method for measuring the taper size of an orifice chamfer opening is implemented based on a fixture for measuring the taper size of an orifice chamfer opening, and comprises the following steps:

[0018] Step 1: prepare a standard test block, on which a standard hole with a chamfer angle and a hole diameter of known standard values ​​is opened, insert a measuring plug gauge into the standard hole, read the degree of the dial indicator at this time, and adjust the dial indicator reading to zero;

[0019] Step 2: Insert the measuring plug gauge into the hole to be measured, and make the end face of the measuring sleeve tightly contact the end face of the hole. At this time, the chamfered conical surface of the hole to be measured acts on the measuring plug gauge and drives the measuring plug gauge and the measuring rod to move;

[0020] Step 3, the action end of the measuring rod moves to act on the reading amplification device, and the reading amplification device amplifies the travel of the measuring rod by a calibrated multiple and then acts on the measuring head of the dial indicator;

[0021] Step 4: Read the dial indicator reading at this time, which is the axial stroke of the measuring rod after the calibration multiple is magnified. The chamfer opening size can be calculated through the trigonometric relationship between the axial stroke, the chamfer angle of the orifice, and the orifice diameter.

[0022] In order to better implement the present invention, further, the calculation formula of the chamfer opening size is as follows:

[0023] Dx=D+2tanα·X;

[0024] Where: Dx represents the chamfer opening size; D represents the orifice diameter; X represents the actual axial stroke of the measuring rod; α represents the angle of the orifice chamfer.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] The present invention provides a reading amplification device between the measuring rod and the measuring head of the dial indicator. Through the cooperation of the first piston, the second piston and the flow channel in the reading amplification device, the moving stroke of the measuring rod can be amplified to the stroke of the second piston by a certain multiple, thereby amplifying the degree on the final dial indicator, which is equivalent to amplifying the tiny stroke of the measuring rod, ensuring that the degree can be performed more accurately, and finally ensuring the accuracy of the calculation of the chamfer size of the orifice. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the structural diagram of the measuring fixture;

[0028] Figure 2 It is a structural schematic diagram of a reading amplification device;

[0029] Figure 3 Schematic diagram of the installation of the first return spring and the second return spring;

[0030] Figure 4 This is a schematic diagram for calculating the chamfer size of the orifice.

[0031] Among them: 1-measuring sleeve; 2-measuring rod; 3-measuring plug gauge; 4-dial indicator; 5-reading amplification device; 6-radial locking piece; 7-bushing; 8-measuring rod locking piece; 9-positioning plate; 51-first piston; 52-second piston; 53-flow channel; 54-adapter inner sleeve; 100-first piston chamber; 200-second piston chamber; 111-first return spring; 222-second return spring. DETAILED DESCRIPTION

[0032] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the present invention explicitly states otherwise, singular forms are also intended to include plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] Embodiment 1:

[0037] A hole chamfer opening taper size measuring fixture of this embodiment, such as Figure 1-Figure 3 As shown, it includes a measuring sleeve 1, a measuring rod 2 is slidably arranged inside the measuring sleeve 1, the measuring end of the measuring rod 2 extends to the outside of the measuring sleeve 1 and is coaxially provided with a measuring plug gauge 3, the active end of the measuring rod 2 is located inside the measuring sleeve 1, a dial indicator 4 is arranged at the end of the measuring sleeve 1 away from the measuring plug gauge 3, the measuring head of the dial indicator 4 extends to the inside of the measuring sleeve 1, a reading amplification device 5 is arranged between the active end of the measuring rod 2 and the measuring head of the dial indicator 4, one end of the reading amplification device 5 abuts against the active end of the measuring rod 2, and the other end of the reading amplification device 5 abuts against the measuring head of the dial indicator 4.

[0038] The specific measurement steps are as follows:

[0039] Step 1, prepare a standard test block, on which a standard hole with a chamfer angle and a hole diameter of known standard values ​​is opened, insert the measuring plug gauge 3 into the inside of the standard hole, and read the degree of the dial indicator 4 at this time, and adjust the reading of the dial indicator 4 to zero;

[0040] Step 2, insert the measuring plug gauge 3 into the hole to be measured, and make the end face of the measuring sleeve 1 tightly contact with the end face of the hole opening, at this time, the chamfered conical surface of the hole to be measured acts on the measuring plug gauge 3 and drives the measuring plug gauge 3 and the measuring rod 2 to move;

[0041] Step 3, the action end of the measuring rod 2 moves to act on the reading amplifying device 5, and the reading amplifying device 5 amplifies the travel of the measuring rod 2 by a calibrated multiple and then acts on the measuring head of the dial indicator 4;

[0042] Step 4, read the reading of the dial indicator 4 at this time, which is the axial stroke of the measuring rod 2 after the calibration multiple is magnified. The trigonometric relationship between the axial stroke, the angle of the orifice chamfer, and the orifice diameter is as follows: Figure 4 As shown, the chamfer opening size can be calculated.

[0043] The specific solution formula is as follows:

[0044] Dx=D+2tanα·X;

[0045] Where: Dx represents the chamfer opening size; D represents the orifice diameter; X represents the actual axial stroke of the measuring rod; α represents the angle of the orifice chamfer.

[0046] Embodiment 2:

[0047] A hole chamfer opening taper size measuring fixture, improved on the basis of embodiment 1, such as Figure 2 and Figure 3 As shown, the reading amplification device 5 includes a first piston 51 and a second piston 52. The first piston 51 and the second piston 52 are slidably arranged inside the measuring sleeve 1. The first piston 51 abuts against the working end of the measuring rod 2, and the second piston 52 abuts against the measuring head of the dial indicator 4. A flow channel 53 is arranged between the first piston 51 and the second piston 52, and the inner diameter of the flow channel 53 is less than the diameter of the second piston 52 and less than the diameter of the first piston 51.

[0048] When the connecting rod 2 moves axially driven by the measuring plug gauge 3, the active end of the connecting rod 2 contacts the first piston 51 and drives the first piston 51 to move. The flow channel 53 is filled with hydraulic oil. When the first piston 51 moves, the hydraulic oil is squeezed, so that the hydraulic oil acts on the second piston 52 through the flow channel 53. Since the inner diameter of the flow channel 53 is less than the diameter of the second piston 52 and less than the diameter of the first piston 51, the moving stroke of the first piston 51 will be magnified to the moving stroke of the second piston 52. When the second piston 52 moves, it acts on the measuring head of the dial indicator 4, thereby amplifying the reading of the dial indicator 4, making it easier to read the stroke value more clearly and accurately.

[0049] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0050] Embodiment 3:

[0051] A hole chamfer opening taper size measuring fixture, improved on the basis of embodiment 1 or 2, such as Figure 2 and Figure 3 As shown, the measuring sleeve 1 is provided with an adapter inner sleeve 54 inside, the adapter inner sleeve 54 is provided with a first piston chamber 100 at one end close to the measuring rod 2, the adapter inner sleeve 54 is provided with a second piston chamber 200 at one end close to the dial indicator 4, the first piston chamber 100 is provided with a first piston 51 slidingly inside, the second piston chamber 200 is provided with a second piston 52 slidingly inside, and the first piston chamber 100 and the second piston chamber 200 are connected via a flow channel 53.

[0052] The first piston chamber 100, the second piston chamber 200 and the flow channel 53 are filled with hydraulic oil. When the first piston 51 moves driven by the measuring rod 2, the hydraulic pressure in the first piston chamber 100 and the flow channel 53 is squeezed to enter the second piston chamber 200. Since the inner diameter of the flow channel 53 is less than the diameter of the second piston 52 and less than the diameter of the first piston 51, the hydraulic oil discharged from the first piston chamber 100 will drive the second piston 52 to move a larger stroke. The second piston 52 acts on the measuring head of the dial indicator 4 to display the enlarged stroke of the measuring rod 2 on the dial indicator 4.

[0053] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0054] Embodiment 4:

[0055] A fixture for measuring the taper size of a chamfered hole opening is improved on the basis of any one of embodiments 1-3, such as Figure 3As shown, a first return spring 111 is provided between the first piston 51 and the end of the first piston chamber 100 away from the connecting rod 2, and a second return spring 222 is provided between the second piston 52 and the end of the second piston chamber 200 close to the dial indicator 4. When the first piston 51 moves, it squeezes the first return spring 111, and when the second piston 52 moves, it stretches the second return spring 222. After the external force is removed, the first piston 51 and the second piston 52 are driven back to the initial balanced position by the rebound action of the first return spring 111 and the second return spring 222, so as to wait for the next measurement.

[0056] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0057] Embodiment 5:

[0058] A fixture for measuring the taper size of a chamfered hole opening is improved on the basis of any one of embodiments 1-4, such as Figure 1 As shown, a radial locking piece 6 is provided on the side wall of the measuring sleeve 1 at one end close to the dial indicator 4, and one end of the radial locking piece 6 extends into the interior of the measuring sleeve 1 and tightens and fixes the measuring head of the dial indicator 4.

[0059] When the measuring plug gauge 3 acts on the standard hole on the standard test block, after the degree of the dial indicator 4 is adjusted to zero, the measuring head of the dial indicator 4 is tightened and fixed by the radial locking piece 6, so that the dial indicator 4 is fixed at the zero position.

[0060] Furthermore, a bushing 7 is provided between the outer side of the measuring plug of the dial gauge 4 and the inner wall of the measuring sleeve 1, and the end of the radial locking member 6 abuts against the outer side of the bushing 7. By providing the bushing 7, the radial locking member 6 acts on the outside of the bushing 7, so that the radial locking member 6 is prevented from directly acting on the outside of the measuring plug of the dial gauge 4, thereby preventing the measuring plug of the dial gauge 4 from being damaged.

[0061] Furthermore, the radial locking member 6 is a locking screw threadedly assembled on the side wall of the measuring sleeve 1 .

[0062] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they are not described again.

[0063] Embodiment 6:

[0064] A fixture for measuring the taper size of a chamfered hole opening is improved on the basis of any one of embodiments 1-5, such as Figure 1 As shown, a measuring rod locking piece 8 is provided on the side wall between the two ends of the measuring sleeve 1 , and one end of the measuring rod locking piece 8 extends into the interior of the measuring sleeve 1 and abuts against the outer side surface of the measuring rod 2 .

[0065] After the measuring plug gauge 3 is inserted into the hole and in place, the side of the measuring rod 2 can be tightened and fixed by the measuring rod locking piece 8 to prevent the measuring rod 2 from moving during the subsequent reading process and causing the reading of the dial indicator 4 to fluctuate, and at the same time, it can also prevent the measuring rod 2 from escaping from the measuring sleeve 1.

[0066] The other parts of this embodiment are the same as any one of Embodiments 1-5, so they are not described again.

[0067] Embodiment 7:

[0068] A fixture for measuring the taper size of a chamfered hole opening is improved on the basis of any one of embodiments 1-6, such as Figure 1 As shown, a positioning plate 9 is provided at one end of the measuring sleeve 1 close to the measuring plug gauge 3 , and a positioning end surface is provided at one side of the positioning plate 9 close to the measuring plug gauge 3 , and the positioning end surface is perpendicular to the axis of the measuring sleeve 1 .

[0069] When measuring, the positioning end face of the positioning disk 9 is fitted with the end face of the hole, thereby ensuring that the axis of the measuring sleeve 1 is perpendicular to the end face of the hole, thereby ensuring the accuracy of subsequent measurements.

[0070] The other parts of this embodiment are the same as any one of Embodiments 1-6, so they are not described again.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A fixture for measuring the taper size of a chamfered hole, comprising a measuring sleeve (1), wherein a measuring rod (2) is slidably arranged inside the measuring sleeve (1), characterized in that: The measuring end of the measuring rod (2) extends to the outside of the measuring sleeve (1) and is coaxially provided with a measuring plug gauge (3); the active end of the measuring rod (2) is located inside the measuring sleeve (1); a dial indicator (4) is provided at one end of the measuring sleeve (1) away from the measuring plug gauge (3); the measuring head of the dial indicator (4) extends to the inside of the measuring sleeve (1); a reading amplification device (5) is provided between the active end of the measuring rod (2) and the measuring head of the dial indicator (4); one end of the reading amplification device (5) abuts against the active end of the measuring rod (2), and the other end of the reading amplification device (5) abuts against the measuring head of the dial indicator (4).

2. A hole chamfer opening taper size measuring fixture according to claim 1, characterized in that: The reading amplification device (5) comprises a first piston (51) and a second piston (52). The first piston (51) and the second piston (52) are slidably arranged inside the measuring sleeve (1). The first piston (51) abuts against the action end of the measuring rod (2), and the second piston (52) abuts against the measuring head of the dial gauge (4). A flow channel (53) is arranged between the first piston (51) and the second piston (52). The inner diameter of the flow channel (53) is smaller than the diameter of the second piston (52) and smaller than the diameter of the first piston (51).

3. A hole chamfer opening taper size measuring fixture according to claim 2, characterized in that: The measuring sleeve (1) is provided with an adapter inner sleeve (54) inside, a first piston chamber (100) is provided at one end of the adapter inner sleeve (54) close to the measuring rod (2), a second piston chamber (200) is provided at one end of the adapter inner sleeve (54) close to the dial indicator (4), a first piston (51) is slidably provided inside the first piston chamber (100), a second piston (52) is slidably provided inside the second piston chamber (200), and the first piston chamber (100) and the second piston chamber (200) are connected via a flow channel (53).

4. A hole chamfer opening taper size measuring fixture according to claim 3, characterized in that: A first return spring (111) is arranged between the first piston (51) and an end of the first piston chamber (100) away from the connecting rod (2), and a second return spring (222) is arranged between the second piston (52) and an end of the second piston chamber (200) close to the dial indicator (4).

5. A fixture for measuring the taper size of a chamfered hole according to any one of claims 1 to 4, characterized in that: A radial locking piece (6) is provided on the side wall of the measuring sleeve (1) at one end close to the dial gauge (4); one end of the radial locking piece (6) extends into the interior of the measuring sleeve (1) and tightens and fixes the measuring head of the dial gauge (4).

6. A hole chamfer opening taper dimension measuring fixture according to claim 5, characterized in that: A bushing (7) is arranged between the outer side of the measuring head of the dial gauge (4) and the inner wall of the measuring sleeve (1), and the end of the radial locking piece (6) abuts against the outer side surface of the bushing (7).

7. A fixture for measuring the taper size of a chamfered hole according to any one of claims 1 to 4, characterized in that: A measuring rod locking piece (8) is provided on the side wall between the two ends of the measuring sleeve (1), and one end of the measuring rod locking piece (8) extends into the interior of the measuring sleeve (1) and abuts against the outer side surface of the measuring rod (2).

8. A fixture for measuring the taper size of a chamfered hole according to any one of claims 1 to 4, characterized in that: A positioning plate (9) is provided at one end of the measuring sleeve (1) close to the measuring plug gauge (3), and a positioning end face is provided at one side of the positioning plate (9) close to the measuring plug gauge (3), wherein the positioning end face is perpendicular to the axis of the measuring sleeve (1).

9. A method for measuring the taper size of a chamfered hole, based on the fixture for measuring the taper size of a chamfered hole according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, prepare a standard test block, on which a standard hole with a chamfer angle and a hole diameter of known standard values ​​is opened, insert a measuring plug gauge (3) into the standard hole, read the degree of the dial indicator (4) at this time, and adjust the reading of the dial indicator (4) to zero; Step 2, insert the measuring plug gauge (3) into the hole to be measured, and make the end face of the measuring sleeve (1) tightly contact with the end face of the hole opening, at this time, the chamfered conical surface of the hole to be measured acts on the measuring plug gauge (3) and drives the measuring plug gauge (3) and the measuring rod (2) to move; Step 3, the action end of the measuring rod (2) moves to act on the reading amplification device (5), and the reading amplification device (5) amplifies the travel of the measuring rod (2) by a calibrated multiple and then acts on the measuring head of the dial indicator (4); Step 4, read the reading of the dial indicator (4) at this time, which is the axial stroke of the measuring rod (2) after the calibration multiple is magnified. The chamfer opening size is calculated through the trigonometric relationship between the axial stroke, the angle of the orifice chamfer, and the orifice diameter.

10. A method for measuring the taper size of a chamfered hole according to claim 9, characterized in that: The calculation formula for the chamfer opening size is as follows: Dx=D+2tanα·X; Where: Dx represents the chamfer opening size; D represents the orifice diameter; X represents the actual axial stroke of the measuring rod; α represents the angle of the orifice chamfer.

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