An aero-engine deep hole reference alignment device and method

Abstract

This invention relates to the technical field of aero-engine machining, and more specifically, to a deep-hole reference alignment device and method for aero-engines. The device includes a fixed rod, an angle connecting rod, and a dial indicator with a probe mounted on it. The angle connecting rod is hinged to one end of the fixed rod, and the dial indicator is mounted on the angle connecting rod. It also includes bolts and a fine-tuning nut. The fixed rod has a fine-tuning groove that divides it into a fine-tuning section and a base section. The end of the fine-tuning section near the angle connecting rod is connected to the base section. One end of the bolt passes sequentially through the base section and the other end of the fine-tuning section and is threadedly connected to the fine-tuning nut. By adjusting the fine-tuning nut, the probe pressure can be finely adjusted without the operator needing to insert their hand into the deep hole, avoiding force errors caused by manual tapping. Furthermore, since only the fixed rod and the angle connecting rod are hinged, stability is high. The probe and the spindle centerline are located in the same plane, reducing system errors and improving alignment accuracy.

Description

Technical Field

[0001] This invention relates to the technical field of aero-engine machining, and more specifically, to an aero-engine deep hole reference alignment device and alignment method. Background Technology

[0002] In the field of aero-engine manufacturing, the large and complex air intake casing is one of the core components. Its internal structure is precise and complex, typically featuring bearing holes and multiple stepped holes. Among these, the bearing holes serve as a critical design datum, directly determining the machining accuracy of each stepped hole. Extremely high coaxiality and runout accuracy are required between each stepped hole and the bearing hole. To ensure that the positional accuracy of each hole system meets design standards during subsequent CNC machining, the datum of the air intake casing must be precisely aligned before machining.

[0003] Currently, the industry commonly uses a combined tooling solution of an extended fixing rod, a universal bracket, and a lever dial indicator for deep hole datum alignment. First, the universal bracket and lever dial indicator are assembled and fixed to the extended fixing rod. Then, the other end of the fixing rod is clamped onto the spindle tool holder. Next, the spindle position is adjusted, and after the initial measurement range of the lever dial indicator is set, the operator gently taps the dial indicator area with their finger to fine-tune the contact pressure between the probe and the datum hole wall. Then, the spindle is rotated, and the reading of the lever dial indicator is observed simultaneously. The probe pressure and spindle position are repeatedly adjusted based on the reading until the runout value displayed by the dial indicator meets the requirement of ≤0.005mm. Finally, this point is set as the origin of the machining coordinates, completing the datum alignment.

[0004] However, the aforementioned existing technical solutions have significant drawbacks in practical applications, specifically: First, the narrow internal space of the reference hole necessitates the operator to insert their palm into the hole to tap the dial indicator when fine-tuning the probe pressure. This can easily cause interference between the palm and the casing parts, leading to inconvenience and significantly extending the alignment time. Second, the palm inserted into the hole obstructs the operator's view, making it difficult to clearly read the dial indicator reading and easily causing observation errors. Third, the adjustment of probe pressure depends on the force and direction of the tapping, and the randomness of manual force application makes it impossible to precisely control the probe pressure, resulting in alignment errors and affecting machining accuracy. Fourth, for some holes with excessively small diameters, excessive depths, or deep holes where there is interference between parts and equipment, the operator's palm cannot be inserted into the hole to complete the tapping adjustment operation.

[0005] Existing technology discloses a multi-directional adjustable connection device for a dial indicator, comprising a fixed rod, a connecting rod, a rotary adjusting rod, and an angle adjusting rod installed sequentially from top to bottom, enabling adjustment of the lever dial indicator in any direction and angle. However, the existing method uses a combination of the fixed rod, connecting rod, rotary adjusting rod, and angle adjusting rod to form an alignment fixture, which has two connecting structures. These structures are prone to loosening over time, affecting alignment accuracy. Furthermore, the existing technology uses two connecting structures with different angular directions, enabling six degrees of freedom feed control. However, this is a drawback in deep hole alignment, as excessive degrees of freedom make it difficult for the pointer of the alignment indicator to coincide with the spindle centerline, introducing systematic errors during actual alignment. This negatively impacts high-precision alignment, rendering the existing technology unable to meet the benchmark alignment requirements for deep holes in aero-engines. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a deep hole reference alignment device and alignment method for aero-engines, improve the convenience and efficiency of probe pressure adjustment, avoid the force error caused by manual tapping and the impact on reading, improve the accuracy of probe pressure control, and achieve high-precision alignment.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a deep hole reference alignment device for aero-engines is provided, including a fixed rod, an angle connecting rod, and a dial indicator with a probe installed. The angle connecting rod is installed at one end of the fixed rod, and the dial indicator is hinged to the angle connecting rod. It also includes a bolt and a fine-tuning nut. The fixed rod has a fine-tuning groove, which divides the fixed rod into a fine-tuning part and a base part. The end of the fine-tuning part near the angle connecting rod is connected to the base part. One end of the bolt passes through the other end of the base part and the fine-tuning part in sequence and is threadedly connected to the fine-tuning nut.

[0008] The deep hole reference alignment device for aero-engines of this invention involves mounting a fixed rod on a main shaft. By creating a fine-tuning groove on the fixed rod and dividing it into a fine-tuning section and a base section, and using a threaded connection structure of bolts and fine-tuning nuts, the probe pressure can be finely adjusted without the operator needing to insert their hand into the deep hole. This effectively avoids the problems of hand interference with parts and obstruction of vision in existing technologies. Furthermore, the precise adjustment characteristics of the threaded transmission avoid force errors caused by manual tapping, significantly improving the accuracy of probe pressure control. It is also suitable for deep holes with small diameters and great depths, expanding the device's applicability. Additionally, the device is only hinged between the fixed rod and the angle connecting rod, resulting in a simple structure and high stability. Controlling the two degrees of freedom in rotational directions through the main shaft and one hinge ensures that the probe is always in the same plane as the centerline of the main shaft, reducing system errors and improving alignment accuracy.

[0009] Furthermore, the base portion has a first through hole, and the other end of the fine-tuning portion has a second through hole corresponding to the first through hole. The bolt passes through the first through hole and the second through hole. This ensures uniform force during bolt insertion, making the displacement of the fine-tuning portion stable and controllable. It avoids fine-tuning failure or decreased adjustment accuracy due to installation deviation, further improving the reliability and stability of the probe pressure adjustment.

[0010] Furthermore, the dial indicator is a digital dial indicator. Compared to traditional lever dial indicators, the readings are more intuitive and accurate, eliminating the need for manual judgment of pointer deviation, effectively reducing visual observation errors, and facilitating rapid reading of fluctuation data. This shortens the data confirmation time during the alignment process and improves the efficiency and accuracy of deep hole benchmark alignment.

[0011] Furthermore, the dial indicator is equipped with a wireless communication module for communicating with external devices. This enables wireless transmission of fluctuation data to external devices, allowing operators to acquire test data in real time without having to approach the deep hole opening. This completely solves the problem of inconvenient data reading caused by obstructed vision inside deep holes, while also facilitating real-time data recording and traceability, further improving operational convenience and the traceability of the alignment process.

[0012] Furthermore, the dial indicator is connected to the angle connecting rod via a first connector and secured with a fastening nut. This achieves a stable connection between the dial indicator and the angle connecting rod, facilitating easy installation and disassembly, maintenance, and replacement of the dial indicator. It also effectively prevents the dial indicator from loosening or shifting during spindle rotation or pressure fine-tuning, ensuring the stability and accuracy of the test data.

[0013] Furthermore, one end of the angle connecting rod is detachably connected to the fixing rod, and the other end of the angle connecting rod is provided with a second connector, the first connector is inserted into the second connector, and the fastening nut is sleeved on the outer periphery of the second connector.

[0014] Furthermore, the second connector has a socket, and an adjustment groove communicating with the socket is formed on the outer periphery of the second connector. The first connector is inserted into the socket. By designing the angle connecting rod as a detachable structure at both ends, and through the plug-in engagement of the second connector and the first connector and the fixing method of the fastening nut, the device can quickly replace the appropriate angle connecting rod according to the different diameters of the hole to be aligned, significantly improving the versatility of the device. At the same time, the plug-in structure facilitates precise adjustment of the dial indicator's installation angle, ensuring that the contact state between the probe and the hole wall meets the testing requirements.

[0015] This invention also provides a method for calibrating a deep hole reference in an aero-engine, comprising the following steps: S1: Select an angle connecting rod according to the diameter of the hole to be aligned, select a fixing rod with a fine-tuning nut according to the depth of the hole to be aligned, and assemble it with a dial indicator to form the above-mentioned deep hole reference alignment device for aero-engines. S2: Adjust the rotation radius of the probe so that it is 1~2mm smaller than the diameter of the alignment hole; S3: Adjust the spindle to the hole to be aligned, and install the end of the fixing rod away from the angle connecting rod onto the spindle tool holder; S4: Adjust the spindle coordinate values, move the probe to the depth of the hole to be aligned, and rotate the fine-tuning nut to move the dial indicator and probe to adjust the probe pressure. S5: Start spindle rotation and read the dial indicator's fluctuation data; S6: Determine whether the dial indicator reading fluctuates by more than 0.005mm. If yes, return to step S4; otherwise, set the current point as the origin of the machining coordinates and complete the benchmark alignment.

[0016] The deep hole datum alignment method for aero-engines of the present invention first selects an appropriate angle connecting rod and fixing rod according to the diameter and depth of the deep hole, and then forms a set of highly adaptable and standardized deep hole datum alignment procedures by precisely adjusting the probe rotation radius and probe pressure, combined with real-time monitoring and cyclic calibration of runout data. This effectively solves the defects of existing technologies such as inconvenient operation, large error and narrow applicability, and significantly improves the efficiency and accuracy of deep hole alignment, providing a reliable guarantee for the high-precision machining of aero-engine casings.

[0017] Preferably, in step S2, the rotation radius of the probe is adjusted using a tool setter and / or a tool setter block. By explicitly using a tool setter and / or a tool setter block to adjust the probe rotation radius, compared to manual estimation or adjustment with simple tools, this method can precisely control the difference between the probe rotation radius and the diameter of the alignment hole, avoiding excessive pressure or poor contact between the probe and the hole wall, ensuring the effectiveness of probe pressure adjustment and the accuracy of the test data, and further improving the stability of the alignment process.

[0018] Preferably, the dial indicator is a digital dial indicator equipped with a wireless communication module for communicating with external devices. Combining the digital display function with the wireless communication module leverages the advantages of the digital dial indicator's accurate and intuitive readings while enabling real-time, long-distance data acquisition via wireless transmission. This dual optimization of the data reading experience completely eliminates errors and operational inconveniences caused by close-range manual observation. Furthermore, it allows operators to quickly respond to fluctuating data changes and adjust the probe pressure promptly, further improving the efficiency and accuracy of deep hole benchmark alignment.

[0019] Compared with the prior art, the beneficial effects of this invention are: improving the convenience and efficiency of stylus pressure adjustment, avoiding the force error and impact on reading caused by manual tapping, improving the accuracy of stylus pressure control, and achieving high-precision alignment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the deep hole reference alignment device for aero-engines in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A in the middle; Figure 3 This is a schematic diagram showing the connection between the dial indicator and the angle connecting rod. Figure 4 This is a flowchart of the deep hole reference alignment method for aero-engines in Embodiment 3 of the present invention.

[0021] In the attached diagram: 1-Fixing rod; 11-Base part; 12-Fine adjustment part; 13-Fine adjustment groove; 2-Bolt; 3-Fine adjustment nut; 4-Angle connecting rod; 41-Second connector; 42-Insertion hole; 43-Adjustment groove; 5-Dial indicator; 51-First connector; 52-Probe; 6-Fastening nut. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Example 1 A deep hole reference alignment device for aero-engines, such as Figure 1 , Figure 3As shown, the device includes a fixed rod 1, an angle connecting rod 4, and a dial indicator 5 with a probe 52 installed. The angle connecting rod 4 is hinged to one end of the fixed rod 1, and the dial indicator 5 is installed on the angle connecting rod 4. It also includes a bolt 2 and a fine-tuning nut 3. The fixed rod 1 has a fine-tuning groove 13, which divides the fixed rod 1 into a fine-tuning part 12 and a base part 11. The end of the fine-tuning part 12 near the angle connecting rod 4 is connected to the base part 11. One end of the bolt 2 passes through the other end of the base part 11 and the fine-tuning part 12 in sequence and is threadedly connected to the fine-tuning nut 3.

[0025] The aforementioned deep hole reference alignment device for aero-engines, when in use, has a fixed rod 1 mounted on the main shaft. By creating a fine-tuning groove 13 on the fixed rod 1 and dividing it into a fine-tuning section 12 and a base section 11, and using a threaded connection structure between the bolt 2 and the fine-tuning nut 3, the pressure of the probe 52 can be finely adjusted without the operator having to insert their palm into the deep hole. This effectively avoids the problems of hand interference with parts and obstruction of vision in existing technologies. At the same time, the precise adjustment characteristics of the threaded transmission avoid the force error caused by manual tapping, significantly improving the accuracy of probe 52 pressure control. It is also suitable for deep hole scenarios with small diameters and deep depths, expanding the applicability of the device. In addition, the device is only hinged between the fixed rod 1 and the angle connecting rod 4, resulting in a simple structure and high stability. Furthermore, by controlling the two degrees of freedom in the rotation direction through the main shaft and one hinge, the probe 52 is always located in the same plane as the centerline of the main shaft, reducing system errors and improving alignment accuracy.

[0026] like Figure 1 , Figure 2 As shown, the base portion 11 has a first through hole, and the other end of the fine-tuning portion 12 has a second through hole corresponding to the first through hole. The bolt 2 passes through the first and second through holes. By providing corresponding first and second through holes in the base portion 11 and the fine-tuning portion 12 respectively, precise installation guidance is provided for the bolt 2, ensuring uniform force during bolt 2 insertion, and making the displacement of the fine-tuning portion 12 stable and controllable. This avoids fine-tuning failure or decreased adjustment accuracy due to installation deviation, further improving the reliability and stability of the pressure adjustment of the probe 52.

[0027] Specifically, the distance along the axial direction of the fixed rod 1 between the hinge center line of the angle connecting rod 4 and the fixed rod 1 and the fine-tuning groove 13 is: The length of the fine-tuning groove 13 along the axial direction of the fixed rod 1 is set to , The fine-tuning nut 3 is a hexagonal nut with a pitch of 1mm, so that the operator can intuitively control the fine-tuning size of the nut during operation. When the fine-tuning nut 3 is rotated 1 / 6 turn, the probe 52 moves a distance of 1.5mm~2mm.

[0028] The dial indicator 5 is a digital dial indicator. Compared with traditional lever dial indicators, the readings are more intuitive and accurate, eliminating the need for manual judgment of pointer deviation, effectively reducing visual observation errors. It also facilitates quick reading of fluctuation data, shortening the data confirmation time during the alignment process and improving the efficiency and accuracy of deep hole benchmark alignment.

[0029] The dial indicator 5 is equipped with a wireless communication module for communicating with external devices. This enables wireless transmission of fluctuation data to external devices, allowing operators to obtain test data in real time without having to approach the deep hole opening. This completely solves the problem of inconvenient data reading caused by obstructed vision inside deep holes, while also facilitating real-time data recording and traceability, further improving operational convenience and the traceability of the alignment process.

[0030] Example 2 This embodiment is similar to Embodiment 1, except that, as Figure 1 , Figure 3 As shown, the dial indicator 5 is connected to the angle connecting rod 4 via the first connector 51 and secured by the fastening nut 6. The mating structure of the first connector 51 and the fastening nut 6 ensures a stable connection between the dial indicator 5 and the angle connecting rod 4. This not only facilitates easy installation and disassembly, making maintenance and replacement of the dial indicator 5 convenient, but also effectively prevents loosening or displacement of the dial indicator 5 during spindle rotation or pressure fine-tuning, ensuring the stability and accuracy of the test data.

[0031] like Figure 1 , Figure 3 As shown, one end of the angle connecting rod 4 is detachably connected to the fixed rod 1, and the other end of the angle connecting rod 4 is provided with a second connector 41. A first connector 51 is inserted into the second connector 41, and a fastening nut 6 is sleeved on the outer periphery of the second connector 41. In implementation, angle connecting rods 4 of different lengths can be selected according to the actual scenario, and the installation angle of the angle connecting rod 4 can be adjusted to suit different deep hole alignments and improve versatility.

[0032] like Figure 3 As shown, the second connector 41 has a socket 42, and an adjustment groove 43 communicating with the socket 42 is formed on the outer periphery of the second connector 41. The first connector 51 is inserted into the socket 42. During assembly, the first connector 51 passes through the fastening nut 6 and is inserted into the socket 42. Then, the fastening nut 6 is fitted onto the outer periphery of the second connector 41. Due to the design of the adjustment groove 43, the second connector 41 can be pressed to make the end of the second connector 41 close and clamp the first connector 51, and facilitate the insertion of the fastening nut 6. After releasing the pressure on the second connector 41, the fastening nut 6 is used to constrain the second connector 41.

[0033] In this embodiment, the device can quickly replace the appropriate angle connecting rod 4 and adjust the installation angle of the angle connecting rod 4 according to the different hole diameters of the hole to be aligned, which significantly improves the versatility of the device. At the same time, the plug-in structure facilitates precise adjustment of the installation angle of the dial indicator 5, ensuring that the contact state between the probe 52 and the hole wall meets the detection requirements.

[0034] Example 3 A method for calibrating deep holes in aero engines, such as Figure 4 As shown, it includes the following steps: S1: Select the angle connecting rod 4 according to the diameter of the hole to be aligned, select the fixing rod 1 with the fine adjustment nut 3 installed according to the depth of the hole to be aligned, and assemble it with the dial indicator 5 to form the aero-engine deep hole reference alignment device of Embodiment 1 or Embodiment 2. S2: Adjust the rotation radius of probe 52 so that the rotation radius is 1~2mm smaller than the diameter of the alignment hole; S3: Adjust the spindle to the alignment hole, and install the end of the fixing rod 1 away from the angle connecting rod 4 onto the spindle tool holder; S4: Adjust the spindle coordinate values, move the probe 52 to the depth of the hole to be aligned, and rotate the fine-tuning nut 3 to drive the dial indicator 5 and the probe 52 to move, thereby adjusting the pressure of the probe 52; S5: Start spindle rotation and read the runout data of dial indicator 5; S6: Determine whether the reading of dial indicator 5 fluctuates by more than 0.005mm. If yes, return to step S4; otherwise, set the current point as the origin of the machining coordinates and complete the benchmark alignment.

[0035] The aforementioned deep hole datum alignment method for aero-engines first selects the appropriate angle connecting rod 4 and fixing rod 1 based on the diameter and depth of the deep hole. Then, by precisely adjusting the rotation radius and pressure of the probe 52, combined with real-time monitoring and cyclic calibration of the runout data, a set of highly adaptable and standardized deep hole datum alignment procedures is formed. This effectively solves the defects of existing technologies, such as inconvenient operation, large errors, and narrow applicability, and significantly improves the efficiency and accuracy of deep hole alignment, providing a reliable guarantee for the high-precision machining of aero-engine casings.

[0036] In step S2, the rotation radius of the probe 52 is adjusted using a tool setter and / or a tool setter block. By explicitly using a tool setter and / or a tool setter block to adjust the rotation radius of the probe 52, compared to manual estimation or adjustment with simple tools, this method can precisely control the difference between the rotation radius of the probe 52 and the diameter of the alignment hole. This avoids excessive pressure or poor contact between the probe 52 and the hole wall, ensuring the effectiveness of the probe 52 pressure adjustment and the accuracy of the detection data, further improving the stability of the alignment process.

[0037] The dial indicator 5 is a digital dial indicator equipped with a wireless communication module for communicating with external devices. The combination of digital display and wireless communication leverages the advantages of the digital dial indicator 5—precise and intuitive readings—while also enabling real-time, long-distance data acquisition via wireless transmission. This dual optimization of the data reading experience completely eliminates errors and operational inconveniences caused by close-range manual observation. Furthermore, it allows operators to quickly respond to fluctuating data and promptly adjust the pressure of the probe 52, further improving the efficiency and accuracy of deep hole benchmark alignment.

[0038] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An aero-engine deep hole reference alignment device, comprising a fixed rod (1), an angle connecting rod (4) and a micrometer (5) provided with a measuring needle (52), the angle connecting rod (4) is hinged to one end of the fixed rod (1), and the micrometer (5) is installed on the angle connecting rod (4); characterized in that, It also includes a bolt (2) and a fine-tuning nut (3). The fixing rod (1) has a fine-tuning groove (13), which divides the fixing rod (1) into a fine-tuning part (12) and a base part (11). The end of the fine-tuning part (12) near the angle connecting rod (4) is connected to the base part (11). One end of the bolt (2) passes through the base part (11) and the other end of the fine-tuning part (12) in sequence and is threadedly connected to the fine-tuning nut (3).

2. The aero-engine deep hole reference alignment device of claim 1, wherein, The base part (11) has a first through hole, and the other end of the fine adjustment part (12) has a second through hole corresponding to the first through hole. The bolt (2) passes through the first through hole and the second through hole.

3. The aero-engine deep hole reference alignment device of claim 1, wherein, The dial indicator (5) is a digital dial indicator.

4. The deep hole reference alignment device for aero-engines according to claim 1, characterized in that, The dial indicator (5) is equipped with a wireless communication module for communicating with external devices.

5. The deep hole reference alignment device for aero-engines according to claim 1, characterized in that, The dial indicator (5) is connected to the angle connecting rod (4) via the first connector (51) and fixed by the fastening nut (6).

6. The aero-engine deep hole reference alignment device according to claim 5, characterized in that, One end of the angle connecting rod (4) is detachably connected to the fixed rod (1), and the other end of the angle connecting rod (4) is provided with a second connector (41). The first connector (51) is inserted into the second connector (41), and the fastening nut (6) is sleeved on the outer periphery of the second connector (41).

7. The aero-engine deep hole reference alignment device according to claim 6, characterized in that, The second connector (41) has a socket (42), and the outer periphery of the second connector (41) has an adjustment groove (43) that communicates with the socket (42). The first connector (51) is inserted into the socket (42).

8. A method for calibrating a deep hole reference in an aero-engine, characterized in that, Includes the following steps: S1: Select an angle connecting rod (4) according to the diameter of the hole to be aligned, select a fixing rod (1) with a fine-tuning nut (3) installed according to the depth of the hole to be aligned, and assemble it with a dial indicator (5) to form the deep hole reference alignment device for aero-engines as described in any one of claims 1 to 7. S2: Adjust the rotation radius of the probe (52) so that the rotation radius is 1~2mm smaller than the diameter of the alignment hole; S3: Adjust the spindle to the hole to be aligned, and install the end of the fixing rod (1) away from the angle connecting rod (4) onto the spindle tool holder; S4: Adjust the spindle coordinate value, move the probe (52) to the depth of the hole to be aligned, and rotate the fine adjustment nut (3) to drive the dial indicator (5) and the probe (52) to move, thereby adjusting the pressure of the probe (52); S5: Start the spindle rotation and read the runout data of the dial indicator (5); S6: Determine whether the reading of the dial indicator (5) fluctuates by more than 0.005 mm. If yes, return to step S4; if no, set the current position as the origin of the machining coordinates and complete the benchmark alignment.

9. The method for calibrating deep holes in aero-engines according to claim 8, characterized in that, In step S2, the rotation radius of the probe (52) is adjusted by the tool setter and / or the tool setter block.

10. The method for aligning deep holes in aero-engines according to claim 8, characterized in that, The dial indicator (5) is a digital dial indicator equipped with a wireless communication module for communicating with external devices.

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