A positioning method and processing method for portable boring machine

Abstract

The application relates to a boring machining method, and discloses a positioning method and a machining method for a portable boring machine. The portable boring machine comprises a machine base, a movable machine body, a rotating shaft and a boring tool, and is used for machining a flange hole of a flange plate. The positioning method comprises the following steps: extending the rotating shaft into the flange hole, measuring the relative position of the machine base and the flange plate through a short ruler, and making the axis of the rotating shaft coincide with the axis of the flange hole; distributing two first dial gauges on the left and right sides of the machine base; making the measuring heads respectively abut against the corresponding side surfaces of the machine body; adjusting the relative position of the machine body and the machine base, reading and comparing the readings of the two first dial gauges; applying a pre-tightening force to the bolts on the left and right sides of the machine base; and fastening all the bolts. The machining method comprises the following steps: before each feeding, placing a fourth dial gauge between the flange plate and the boring tool; knocking the boring tool, reading and judging whether the reading of the fourth dial gauge is in a preset feeding range, fixing the boring tool on the rotating shaft, and completing the feeding preparation. The precision loss caused by the positioning error is reduced.

Description

Technical Field

[0001] This application relates to boring operations, and more particularly to a positioning method and a machining method for a portable boring machine. Background Technology

[0002] Currently, in shipbuilding and maintenance, the alignment and boring of the double-sided flanges of the propeller shaft and intermediate shaft is a critical process to ensure the operation of the propulsion system. Due to the constraints of the shipboard working environment and equipment conditions, traditional lathes cannot be used, and only portable boring machines can be employed for machining.

[0003] Compared to lathe machining, portable boring machines face numerous challenges when operating on ships. Ships are characterized by confined spaces, high vibration levels, and complex environments, making equipment installation and debugging difficult and demanding high levels of operator skill. Furthermore, the propeller shaft and intermediate shaft have different bore diameters, requiring boring to be performed using the intermediate shaft bore as a reference, and the limited bore allowance further complicates the machining process.

[0004] Therefore, how to accurately position and process portable boring machines has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem this application aims to solve is: how to improve the positioning and machining accuracy of portable boring machines.

[0006] To address the aforementioned technical problems, this application provides a positioning method and a processing method for a portable boring machine.

[0007] The first aspect of this application provides a positioning method for a portable boring machine. The portable boring machine includes a base, a movable body, a rotating shaft, and a boring tool for machining flange holes in a flange. The positioning method includes: inserting the rotating shaft into the flange hole; measuring the relative position of the base and the flange using a short ruler to ensure that the axis of the rotating shaft coincides with the axis of the flange hole; placing the heads of two dial indicators on the base, with the two dial indicators distributed on the left and right sides of the base; contacting the measuring heads of the dial indicators with the corresponding sides of the body; adjusting the relative position of the body and the base by 0.1 mm each time; reading and comparing the readings of the two dial indicators until the difference between the readings of the two dial indicators is less than or equal to 0.02 mm; applying preload to the bolts on the left and right sides of the base; and tightening all bolts.

[0008] In one embodiment, after the step of applying preload to the bolts on the left and right sides of the machine base and before the step of tightening all the bolts, the positioning method further includes: placing the dial indicator head on the rotating shaft and contacting the measuring head of the second dial indicator with the flange face of the flange; rotating the rotating shaft and adjusting the bolts on the front and rear sides of the machine base until the change in the reading of the second dial indicator during one revolution is less than or equal to 0.03 mm; and applying preload to the bolts on the front and rear sides of the machine base.

[0009] In one embodiment, after the step of applying pre-tightening force to the bolts on the front and rear sides of the machine base and before the step of tightening all the bolts, the positioning method further includes: placing the dial indicator head on the rotating shaft, and contacting the measuring head of the third dial indicator with the inner wall of the flange hole of the flange; rotating the rotating shaft and adjusting the bolts on the left and right sides of the machine body until the change in the reading of the third dial indicator during one revolution is less than or equal to 0.03 mm; and applying pre-tightening force to the bolts on the left and right sides of the machine body.

[0010] In one embodiment, before tightening all the bolts, after applying preload to the bolts on the left and right sides of the base, the bolts on the front and rear sides of the base, and the bolts on the left and right sides of the body, the positioning method further includes: repeatedly reading and confirming the readings of the first dial indicator, the second dial indicator, and the third dial indicator.

[0011] The second aspect of this application provides a machining method for a portable boring machine. Before performing the machining method, the portable boring machine is positioned using the positioning method provided in the first aspect of this application. The machining method includes: before each feed, placing the head of a fourth dial indicator on the outer circle of a flange, and making the measuring head of the fourth dial indicator contact with the boring tool of the portable boring machine in a vertical direction; tapping the boring tool and reading the reading of the fourth dial indicator; if the reading of the fourth dial indicator exceeds the preset feed range, adjusting the relative position of the boring tool and the shaft of the portable boring machine until the reading of the fourth dial indicator is within the preset feed range; if the reading of the fourth dial indicator is within the preset feed range, fixing the boring tool on the shaft to complete the preparation for a single feed.

[0012] In one embodiment, the preset feed range is 1 mm to 3 mm.

[0013] In one embodiment, if the reading of the fourth dial indicator exceeds the preset feed range, the step of adjusting the relative position of the boring tool and the shaft of the portable boring machine includes: if the reading of the fourth dial indicator exceeds the upper limit of the preset feed range, moving the boring tool away from the flange; if the reading of the fourth dial indicator is lower than the lower limit of the preset feed range, moving the boring tool closer to the flange.

[0014] In one embodiment, the step of fixing the boring bar to the rotating shaft includes: applying a preload to the bolt between the boring bar and the rotating shaft; and tightening the bolt between the boring bar and the rotating shaft using a torque wrench.

[0015] In one embodiment, after each feed is completed, the machining method further includes: repeating the feed preparation step until the target machining size is reached.

[0016] In one embodiment, after all feeds are completed, the machining method further includes: removing the boring bar and installing the floating tool onto the spindle; adjusting the radial position and axial angle of the floating tool so that the cutting edge of the floating tool contacts the inner wall of the flange hole of the flange; controlling the rotational speed and feed rate of the spindle to perform floating tool finishing on the inner wall of the flange hole of the flange until the target machining accuracy is achieved.

[0017] Compared with the prior art, the positioning and processing methods for a portable boring machine according to the embodiments of this application have the following advantages: This embodiment of the application uses a combination of "short ruler coarse positioning and dual dial indicator fine adjustment." First, the short ruler is used to quickly calibrate the alignment of the shaft and the flange hole. Then, the first dial indicator on both sides of the machine base is used to adjust the machine body position with an accuracy of 0.1 mm, controlling the left and right deviations within 0.02 mm. This significantly improves the coaxiality of the portable boring machine installation and avoids the loss of machining accuracy caused by initial positioning errors. The pre-tightening and tightening of bolts further eliminates installation stress and vibration hazards, providing a stable reference for subsequent processing, which can significantly improve the positioning and machining accuracy of the portable boring machine. Attached Figure Description

[0018] Figure 1 This is an exemplary embodiment of the present application showing the installation diagram of a dial indicator for a portable boring machine.

[0019] Figure 2 This is a partial structural schematic diagram of a portable boring machine, as exemplarily shown in an embodiment of this application.

[0020] Figure 3 This is a top view of a portable boring machine, as exemplarily shown in an embodiment of this application.

[0021] Figure 4 This is a flowchart illustrating an exemplary embodiment of a positioning method for a portable boring machine.

[0022] Figure 5 This is a flowchart illustrating a processing method for a portable boring machine, as exemplarily shown in an embodiment of this application.

[0023] Figure label: 1. Portable boring machine; 2. Flange; 11. Machine base; 12. Machine body; 13. Rotary shaft; 14. Boring tool; 21. Flange hole; 31. First dial indicator; 32. Second dial indicator; 33. Third dial indicator; 34. Fourth dial indicator; 41. Bolts on the left and right sides of the machine base; 42. Bolts on the front and rear sides of the machine base; 43. Bolts distributed on the left and right sides of the machine body. Detailed Implementation

[0024] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0025] In the construction and maintenance of ships, the reliable connection between the propeller shaft and the intermediate shaft is a crucial link in ensuring the stable operation of the ship's propulsion system. Double-sided flange centering boring is the core process of this connection, and its machining quality directly affects the coaxiality, force transmission performance, and sealing effect of the shaft system. Currently, due to the limitations of the ship's operating environment and equipment conditions, this type of machining often needs to be performed on board and cannot be done using traditional lathes; instead, portable boring machines are used.

[0026] Compared to lathe machining, portable boring machines face significant challenges when operating on ships. Firstly, the confined space, high vibration levels, and complex operating environment on board greatly increase the difficulty of equipment installation and commissioning, demanding extremely high skill levels from operators. Secondly, due to the difference in bore diameters between the propeller shaft and the intermediate shaft, boring operations must be performed using the intermediate shaft bore as a reference, and the limited bore allowance further exacerbates the machining difficulty. Furthermore, the operating conditions on ships place extremely stringent precision requirements on the shafting system, and portable boring machines, lacking high-precision positioning and feed control, are highly prone to causing shaft bolt hole dimensions to exceed the drawing tolerances, failing to meet technical specifications and consequently affecting the ship's navigation safety and service life.

[0027] How to achieve high-precision boring of the flange with different diameters between the propeller shaft and intermediate shaft using a portable boring machine in the complex environment of a ship, especially the problem of accurately controlling the size of the shaft bolt holes, has become a technical bottleneck that urgently needs to be overcome in the field of shipbuilding and maintenance.

[0028] Therefore, a preferred embodiment of this application provides a positioning method for a portable boring machine 1, such as... Figure 1-3 As shown, the portable boring machine 1 may include a base 11, a movable body 12, a rotating shaft 13 and a boring tool 14, for machining the flange hole 21 of the flange 2.

[0029] Based on this, such as Figure 4 As shown, the positioning method may include: S101. Insert the rotating shaft 13 into the flange hole 21, and measure the relative position of the machine base 11 and the flange 2 with a short ruler to make the axis of the rotating shaft 13 coincide with the axis of the flange hole 21.

[0030] S102. Place the heads of the two first dial indicators 31 on the base 11, so that the two first dial indicators 31 are distributed on the left and right sides of the base 11.

[0031] S103. The measuring head of the first dial indicator 31 is brought into contact with the corresponding side of the body 12.

[0032] S104. Adjust the relative position of the body 12 and the base 11 by 0.1 mm each time. Read and compare the readings of the two dial gauges 31 until the difference between the readings of the two dial gauges 31 is less than or equal to 0.02 mm.

[0033] S105. Apply preload to the bolts 41 on both sides of the machine base.

[0034] S106. Tighten all bolts.

[0035] It is understood that in this application, the short ruler can be a steel ruler or a short-range vernier caliper.

[0036] The above method allows for the rapid adjustment of the shaft 13 by measuring the relative position of the base 11 and the flange 2 with a short ruler, aligning its axis with the axis of the flange hole 21. This provides a coarse positioning for determining the reference axis, reducing the workload of subsequent dial indicator fine-tuning, and avoiding adjustment failures due to excessive initial deviation, thus ensuring the basic accuracy of the equipment installation direction.

[0037] Based on this, two dial indicators 31 are distributed on the left and right sides of the base 11, and the measuring head is in contact with the side of the body 12, thus constructing a deviation monitoring system in the left and right directions. This transforms minute offsets that are difficult to detect with the naked eye into intuitive readings, allowing the adjustment results produced in 0.1 mm adjustment steps to be observed. By comparing the readings of the left and right dial indicators, the difference is controlled within 0.02 mm, achieving high-precision fine-tuning of the position of the body 12.

[0038] Pre-tightening force is applied to the bolts on both sides of the base 11 to maintain the fine-tuned position and prevent displacement of the machine body 12 during subsequent operations. The step-by-step pre-tightening strategy avoids twisting or displacement of the machine body 12 caused by tightening the bolts all at once, ensuring that the high-precision position after adjustment is stably maintained and providing a reliable intermediate state for final tightening.

[0039] Furthermore, in this application, after step S105, applying preload to the bolts 41 on both sides of the machine base, and before step S106, tightening all bolts, the positioning method may further include: placing the head of the second dial indicator 32 on the rotating shaft 13, and bringing the measuring head of the second dial indicator 32 into contact with the flange face of the flange 2. Rotating the rotating shaft 13 and adjusting the bolts 42 on both sides of the machine base until the change in the reading of the second dial indicator 32 during one revolution is less than or equal to 0.03 mm. Applying preload to the bolts 42 on both sides of the machine base.

[0040] The dial indicator 32 is placed on the rotating shaft 13, with the measuring head in contact with the flange face. By rotating the shaft 13 and monitoring the change in the dial indicator reading, the perpendicularity of the shaft 13 axis to the flange face can be accurately detected. When the reading changes by ≤0.03 mm in one revolution, it ensures that the boring bar is strictly perpendicular to the flange face in the vertical direction, avoiding defects such as tilting or taper in the machined flange hole 21 due to perpendicularity deviation, and ensuring the sealing and uniform force transmission during shaft connection.

[0041] This step complements the left-right coaxiality adjustment (S104) in terms of spatial dimension. The former controls the horizontal offset, while the latter corrects the vertical deviation, together constructing a three-dimensional error compensation system.

[0042] Based on this, after step S105, applying pre-tightening force to the bolts 42 on both sides of the machine base, and before step S106, tightening all the bolts, the positioning method may further include: placing the head of the third dial indicator 33 on the rotating shaft 13, and contacting the measuring head of the third dial indicator 33 with the inner wall of the flange hole 21 of the flange 2; rotating the rotating shaft 13 and adjusting the bolts 43 distributed on the left and right sides of the machine body until the change in the reading of the third dial indicator 33 during one rotation is less than or equal to 0.03 mm; and applying pre-tightening force to the bolts 43 distributed on the left and right sides of the machine body.

[0043] By measuring the concentricity of the inner wall of flange hole 21 and rotating shaft 13 using dial indicator 33 and controlling the reading variation within ≤0.03mm, the coincidence of the boring bar axis and the theoretical axis of flange hole 21 can be ensured. This effectively eliminates misalignment problems caused by initial installation deviations or hull structure deformation, avoids defects such as eccentricity and excessive ellipticity in the machined flange hole 21, and significantly improves the matching accuracy of shaft system docking.

[0044] By combining the left and right coaxiality adjustment of the first dial gauge 31 and the verticality adjustment of the second dial gauge 32, a three-dimensional error closed-loop control system of "horizontal coaxiality → verticality → inner wall coaxiality" is formed.

[0045] This system corrects positioning errors layer by layer from different dimensions, ensuring that the boring bar meets high precision requirements in three spatial directions, and fully meets the stringent geometric precision standards for machining flange hole 21 in ship shafting.

[0046] Furthermore, before tightening all the bolts, after applying preload to the bolts 41 on the left and right sides of the base, the bolts 42 on the front and rear sides of the base, and the bolts 43 distributed on the left and right sides of the machine body, the positioning method may also include: repeatedly reading and confirming the readings of the first dial indicator 31, the second dial indicator 32, and the third dial indicator 33.

[0047] That is, after the pre-tightening is completed and before it is fully tightened, repeat step S103.

[0048] Repeatedly reading dial indicator readings offers multiple benefits: It eliminates cumulative errors, allowing for timely detection of minor deviations caused by uneven bolt preload or equipment deformation, preventing error propagation. It verifies adjustment effectiveness, serving as the final check in the positioning process; out-of-tolerance adjustments can be made immediately, avoiding rework. It enhances structural stability, forming a closed loop with bolt preload to prevent tightening stress from disrupting the calibration position. It improves machining consistency, providing a stable benchmark for boring, ensuring component machining accuracy, and meeting the requirements of ship shafting assembly.

[0049] Not only that, such as Figure 5 As shown, this application also provides a corresponding processing method for a portable boring machine 1. Before performing the processing method, the portable boring machine 1 is positioned using the positioning method provided in any embodiment of this application. The processing method may include: S201. Before each feed, place the head of the fourth dial indicator 34 on the outer circle of the flange 2, and make the measuring head of the fourth dial indicator 34 contact the boring tool 14 of the portable boring machine 1 in the vertical direction.

[0050] S202, strike the boring bar 14 and read the reading of the fourth dial indicator 34.

[0051] S203. If the reading of the fourth dial indicator 34 exceeds the preset feed range, adjust the relative position of the boring bar 14 and the rotating shaft 13 of the portable boring machine 1 until the reading of the fourth dial indicator 34 is within the preset feed range.

[0052] S204. If the reading of the fourth dial indicator 34 is within the preset feed range, fix the boring tool 14 on the rotating shaft 13 to complete the preparation for a single feed.

[0053] The feed rate is strictly limited to a preset range (e.g., 1-3 mm), and a closed-loop control system is formed by feedback from dial indicator readings. Compared with the inefficient traditional method of "excessive feed rate in a single operation → hole diameter out of tolerance → repeated corrections," this method achieves precise control of the feed rate, significantly reducing the risk of hole diameter out of tolerance due to excessive feed.

[0054] The processing method described in this application, by introducing dynamic measurement and closed-loop control, transforms the traditional extensive processing that relies on manual experience into data-driven precision manufacturing, which shows significant advantages, especially in the complex environment of ships.

[0055] It is understood that since the processing methods in this application are all based on the positioning methods in this application, the embodiments and beneficial effects of the positioning methods are applicable to the processing methods in this application.

[0056] Specifically, in any embodiment of this application, the preset feed range can be from 1 mm to 3 mm.

[0057] Furthermore, if the reading of the fourth dial indicator 34 exceeds the preset feed range, step S203, adjusting the relative position of the boring bar 14 and the rotating shaft 13 of the portable boring machine 1, may include: if the reading of the fourth dial indicator 34 exceeds the upper limit of the preset feed range, moving the boring bar 14 away from the flange 2; if the reading of the fourth dial indicator 34 is lower than the lower limit of the preset feed range, moving the boring bar 14 closer to the flange 2.

[0058] By strictly corresponding the out-of-tolerance direction (upper limit / lower limit) with the adjustment direction (away from / nearer), a direct error reverse compensation mechanism is established.

[0059] The combination of a clearly defined adjustment threshold (preset feed range) and a gradual adjustment method (fine-tuning each time) effectively avoids the "overcorrection" problem commonly found in traditional machining.

[0060] This strategy transforms complex feed rate control into simple "exceed upper limit, move outward; exceed lower limit, move inward" rules. Operators only need to follow the instructions, eliminating the need for extensive experience and judgment. This allows ordinary technicians to complete high-precision machining tasks, alleviating the reliance on highly skilled workers in ship repair sites.

[0061] In one embodiment, step S204, fixing the boring bar 14 to the rotating shaft 13, may include: applying a preload to the bolt between the boring bar 14 and the rotating shaft 13; and using a torque wrench to tighten the bolt between the boring bar 14 and the rotating shaft 13.

[0062] The step-by-step operation of "applying preload + tightening with a torque wrench" avoids the positional displacement or deformation of the boring bar 14 caused by a single strong tightening. Applying preload allows the boring bar 14 to initially fit with the rotating shaft 13, eliminating gaps between components; the torque wrench then completes the final fixation with a precise torque value. By setting a standard torque value, problems such as over-tightening (damaging threads, increasing tool stress) or over-loosening (tool displacement during machining) caused by improper human force application are avoided.

[0063] After each feed is completed, the machining method may also include: repeating the feed preparation steps until the target machining dimension is reached.

[0064] After each feed, the feed preparation steps are repeated. Through real-time monitoring and dynamic error correction, the system adapts to the complex operating environment of ships, ensuring high-precision machining consistency, while reducing rework rates, simplifying processes, facilitating quality traceability, and effectively improving machining efficiency and reducing costs.

[0065] In one embodiment, after all feeds are completed, the machining method may further include: removing the boring bar 14 and installing the floating tool onto the rotating shaft 13; adjusting the radial position and axial angle of the floating tool so that the cutting edge of the floating tool contacts the inner wall of the flange hole 21 of the flange 2; controlling the rotational speed and feed rate of the rotating shaft 13 to perform floating tool finishing on the inner wall of the flange hole 21 of the flange 2 until the target machining accuracy is achieved.

[0066] By replacing the floating tool after all feeds are completed and precisely adjusting its radial and axial positions, combined with optimized speed and feed parameters, and utilizing the floating tool's elastic floating characteristic to automatically compensate for errors such as equipment vibration and spindle runout, high-precision finishing of the inner wall of flange hole 21 can be achieved. For example, the hole diameter error can be controlled within ±0.01 mm, and the surface roughness Ra value can be reduced to 0.8 to 1.6 micrometers. This not only significantly improves machining accuracy and surface quality, meeting the stringent requirements of ship shafting connections, but also reduces tool rigidity impact, extends tool life, and effectively adapts to complex working conditions on ship sites, ensuring machining stability and consistency.

[0067] The positioning and processing methods for a portable boring machine 1 according to embodiments of the present invention have the following advantages compared with the prior art: Regarding the positioning method, a combination of "short ruler coarse positioning + dual dial indicator fine adjustment" is used. First, the short ruler is used to quickly calibrate the alignment of the axis of the rotating shaft 13 and the flange hole 21. Then, the first dial indicator 31 on both sides of the machine base 11 is used to adjust the position of the machine body 12 with an accuracy of 0.1 mm, controlling the left and right deviations within 0.02 mm. This significantly improves the coaxiality of the portable boring machine 1 and avoids the loss of machining accuracy caused by the initial positioning error. Multi-level bolt pre-tightening and step-by-step measurement (perpendicularity, coaxiality, end face runout, etc.) further eliminate the hidden dangers of installation stress and vibration, providing a stable benchmark for subsequent processing.

[0068] In terms of machining methods, a dial indicator is used to monitor and precisely control the feed rate in real time before each feed, combined with a single feed range of 1 to 3 mm, effectively avoiding dimensional deviations and tool damage caused by excessive feed rate. In the floating tool finishing stage, spindle runout is compensated for elastically and adaptively. Combined with specific speed and feed parameters, the roundness, cylindricity, and surface roughness of the flange hole 21 can be improved to levels that are difficult to achieve with traditional methods. The overall technical solution systematically solves the problems of difficult positioning and low machining accuracy of the portable boring machine 1 on board, ensuring the machining quality of the flange hole 21 between the propeller shaft and intermediate shaft, and significantly improving the reliability and stability of the ship's shafting connection.

[0069] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A positioning method for a portable boring machine (1), characterized in that, The portable boring machine (1) includes a base (11), a movable body (12), a rotating shaft (13), and a boring bar (14) for machining the flange hole (21) of the flange (2). The positioning method includes: Insert the rotating shaft (13) into the flange hole (21), and measure the relative position of the machine base (11) and the flange (2) with a short ruler so that the axis of the rotating shaft (13) coincides with the axis of the flange hole (21); Place the heads of the two first dial gauges (31) on the base (11) so that the two first dial gauges (31) are distributed on the left and right sides of the base (11); The measuring head of the first dial indicator (31) is brought into contact with the corresponding side of the body (12); Adjust the relative position of the body (12) and the base (11) by 0.1 mm each time, read and compare the readings of the two first dial gauges (31) until the difference between the readings of the two first dial gauges (31) is less than or equal to 0.02 mm; Apply preload to the bolts (41) on both sides of the machine base; Place the head of the second dial indicator (32) on the rotating shaft (13) and bring the measuring head of the second dial indicator (32) into contact with the flange face of the flange (2); Rotate the shaft (13) and adjust the bolts (42) on the front and rear sides of the base until the reading of the second dial indicator (32) changes by less than or equal to 0.03 mm during one rotation; Apply preload to the bolts (42) on the front and rear sides of the base; After the step of applying preload to the bolts (42) on the front and rear sides of the base and before the step of tightening all the bolts, the positioning method further includes: Place the head of the third dial indicator (33) on the rotating shaft (13) and bring the measuring head of the third dial indicator (33) into contact with the inner wall of the flange hole (21) of the flange (2); Rotate the shaft (13) and adjust the bolts (43) distributed on the left and right sides of the machine body until the reading of the third dial indicator (33) changes by less than or equal to 0.03 mm when rotating one revolution; Apply preload to the bolts (43) distributed on the left and right sides of the fuselage; Tighten all bolts.

2. The positioning method according to claim 1, characterized in that, Before tightening all bolts, after applying preload to the bolts (41) on the left and right sides of the base, the bolts (42) on the front and rear sides of the base, and the bolts (43) distributed on the left and right sides of the fuselage, the positioning method further includes: Repeatedly read and confirm the readings of the first percentage gauge (31), the second percentage gauge (32), and the third percentage gauge (33).

3. A processing method for a portable boring machine (1), characterized in that, Before performing the processing method, the portable boring machine (1) is positioned by the positioning method according to any one of claims 1-2, the processing method comprising: Before each cut, place the head of the fourth dial indicator (34) on the outer circle of the flange (2) and make the measuring head of the fourth dial indicator (34) contact the boring tool (14) of the portable boring machine (1) in the vertical direction. Tap the boring bar (14) and read the reading of the fourth dial indicator (34); If the reading of the fourth dial indicator (34) exceeds the preset feed range, adjust the relative position of the boring bar (14) and the shaft (13) of the portable boring machine (1) until the reading of the fourth dial indicator (34) is within the preset feed range; If the reading of the fourth dial indicator (34) is within the preset feed range, the boring tool (14) is fixed on the rotating shaft (13) to complete the preparation for a single feed.

4. The processing method according to claim 3, characterized in that, The preset feed range is 1 mm to 3 mm.

5. The processing method according to claim 3, characterized in that, If the reading of the fourth dial indicator (34) exceeds the preset feed range, the step of adjusting the relative position of the boring bar (14) and the shaft (13) of the portable boring machine (1) includes: If the reading of the fourth dial indicator (34) exceeds the upper limit of the preset feed range, the boring tool (14) is moved away from the flange (2); If the reading of the fourth dial indicator (34) is lower than the lower limit of the preset feed range, the boring tool (14) is moved closer to the flange (2).

6. The processing method according to claim 3, characterized in that, The step of fixing the boring bar (14) to the rotating shaft (13) includes: Apply a preload to the bolt between the boring bar (14) and the rotating shaft (13); The bolts between the boring bar (14) and the rotating shaft (13) are tightened using a torque wrench.

7. The processing method according to claim 3, characterized in that, After each feed, the machining method further includes: Repeat the tool preparation steps until the target machining dimension is reached.

8. The processing method according to claim 3, characterized in that, After all feeds are completed, the machining method further includes: Remove the boring bar (14) and install the floating tool onto the rotating shaft (13). Adjust the radial position and axial angle of the floating blade so that the cutting edge of the floating blade contacts the inner wall of the flange hole (21) of the flange (2); Control the rotational speed and feed rate of the rotating shaft (13) to perform floating tool finishing on the inner wall of the flange hole (21) of the flange (2) until the target machining accuracy is achieved.

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