Machining methods for the inner holes of irregularly shaped parts

Abstract

This disclosure provides a method for machining the inner hole of an irregularly shaped part, belonging to the field of machining technology. The machining method includes: determining the target eccentric torque when the irregularly shaped part rotates about the theoretical inner hole center, based on the target weight of the irregularly shaped part, the position of its theoretical center of gravity, and the position of its theoretical inner hole center; designing a counterweight based on the target eccentric torque; mounting the counterweight and the irregularly shaped part on a worktable; and machining the inner hole on the irregularly shaped part. This disclosure can improve the machining accuracy of the inner hole.

Description

Technical Field

[0001] This disclosure belongs to the field of machining technology, and specifically relates to a method for machining the inner hole of an irregularly shaped part. Background Technology

[0002] Irregularly shaped parts refer to parts whose center of gravity does not coincide with the center of their inner bore. Various irregularly shaped parts are frequently encountered in offshore cranes, such as irregularly shaped frames used to support rollers. An irregularly shaped frame consists of a central cylinder and two outriggers. The tops of the two outriggers are connected to the two ends of the central cylinder, and the bottoms of the outriggers are used for support on the ground. The central cylinder has an inner bore. Due to production requirements, the dimensional requirements for the central cylinder after machining are extremely high. These dimensional requirements include the diameter tolerance and roundness requirements of its inner bore, the straightness of the inner bore axis, and the perpendicularity of the inner bore axis to the end face of the central cylinder.

[0003] In related technologies, to ensure that the inner hole of the intermediate cylinder meets the requirements after machining, it is often machined on a vertical lathe. Specifically, a custom-shaped machine frame is mounted on the horizontal rotary table of the vertical lathe, allowing the intermediate cylinder to rotate. Then, a milling cutter directly mills the interior of the rotating intermediate cylinder, creating the inner hole.

[0004] However, because the center of gravity of the irregularly shaped machine stand does not coincide with the center of the inner hole, the irregularly shaped machine stand on the worktable will experience centrifugal motion during the inner hole turning process, resulting in the roundness of the inner hole failing to meet the requirements. Moreover, because the center of gravity of the irregularly shaped machine stand does not coincide with the center of the inner hole, the horizontally rotating worktable will also tilt during the inner hole turning process, causing the perpendicularity of the inner hole axis to the end face of the intermediate cylinder to also fail to meet the requirements, ultimately resulting in low machining accuracy of the inner hole. Summary of the Invention

[0005] This disclosure provides a method for machining the inner hole of an irregularly shaped part, which can improve the machining accuracy of the inner hole. The technical solution is as follows:

[0006] This disclosure provides a method for machining the inner hole of an irregularly shaped part. The method includes: determining the target eccentric torque when the irregularly shaped part rotates about the theoretical inner hole center based on the target weight of the irregularly shaped part, the position of the theoretical center of gravity of the irregularly shaped part, and the position of the theoretical inner hole center; designing a counterweight based on the target eccentric torque; mounting the counterweight and the irregularly shaped part on a worktable respectively; and machining the inner hole on the irregularly shaped part.

[0007] In another implementation of this disclosure, determining the target eccentric torque when the irregularly shaped part rotates about the center of the inner hole based on the target weight of the irregularly shaped part, the position of the theoretical center of gravity of the irregularly shaped part, and the position of the theoretical inner hole center includes: drawing a three-dimensional model of the irregularly shaped part; determining the position of the model's center of gravity and the position of the model's inner hole center in the three-dimensional model, and obtaining a first eccentricity distance between the position of the model's center of gravity and the position of the model's inner hole center; and obtaining a first eccentric torque based on the first eccentricity distance and the target weight of the irregularly shaped part.

[0008] Based on the three-dimensional model drawing, the position of the theoretical center of gravity and the position of the theoretical inner hole center are determined in the irregular part, and a second eccentricity is determined between the position of the theoretical center of gravity and the position of the theoretical inner hole center; based on the second eccentricity and the target weight of the irregular part, a second eccentric torque is obtained; the larger of the first eccentric torque and the second eccentric torque is taken as the target eccentric torque.

[0009] In another implementation of this disclosure, the step of designing the counterweight according to the target eccentric torque includes: determining the weight of the counterweight and its installation position on the workbench according to the target eccentric torque.

[0010] In another implementation of this disclosure, determining the weight of the counterweight and its installation position on the workbench based on the target eccentric torque includes: the product of the weight of the counterweight and the distance from the center of gravity of the counterweight to the center of the theoretical inner hole is equal to the target eccentric torque.

[0011] In another implementation of this disclosure, the step of mounting the counterweight and the irregular part on the workbench includes: clamping the irregular part on the workbench, wherein the rotation center of the workbench coincides with the theoretical inner hole center; clamping the counterweight on the workbench, wherein the center of gravity of the counterweight, the theoretical center of gravity, and the rotation center of the workbench are located on the same straight line, and the center of gravity of the counterweight and the theoretical center of gravity are located on opposite sides of the rotation center.

[0012] In another implementation of this disclosure, the processing method further includes: detecting the flatness of the worktable on which the counterweight and the irregular part are clamped; and determining whether to adjust the counterweight based on the flatness.

[0013] In another implementation of this disclosure, the method further includes: if the flatness is greater than a threshold, the workbench is tilted and the counterweight is adjusted.

[0014] In another implementation of this disclosure, adjusting the counterweight includes: adjusting the installation position and / or weight of the counterweight; and fixing the adjusted counterweight to the workbench.

[0015] In another implementation of this disclosure, machining the inner hole on the irregular part includes: sequentially performing test runs, rough machining, and semi-finishing on the irregular part, and detecting the roundness of the machined part at the initial stage of each of the test runs, rough machining, and semi-finishing; adjusting the counterweight according to the roundness of the machined part; installing the adjusted counterweight on the worktable and continuing to detect the roundness of the machined part so that the roundness of the machined part meets the requirements after the counterweight is adjusted; and finishing the irregular part.

[0016] In another implementation of this disclosure, the processing method further includes: detecting the inner diameter, roundness, cylindricity, and perpendicularity of the inner hole axis to the end face of the irregular part.

[0017] The beneficial effects of the technical solutions provided in this disclosure are:

[0018] When machining the inner hole of an irregularly shaped part using the machining method provided in this embodiment, the method first determines the target eccentric torque when the irregularly shaped part rotates around the theoretical inner hole center based on its target weight, theoretical center of gravity, and theoretical inner hole center. Then, a counterweight is designed based on this target eccentric torque, and the designed counterweight is assembled with the irregularly shaped part onto a (horizontally rotating) worktable. This counterweight countersupplementation of the worktable after the irregularly shaped part is assembled, ensuring that the rotation center of the worktable coincides with the theoretical inner hole center, preventing the worktable from tilting. During inner hole machining, this compensates for the worktable tilting caused by the misalignment of the theoretical center of gravity and the theoretical inner hole center, thereby improving the machining accuracy of the inner hole.

[0019] In other words, the machining method for inner holes provided in this embodiment improves the machining accuracy of inner holes by pre-designing a counterweight and connecting the counterweight and the irregular part together on the worktable during machining. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the irregularly shaped part provided in the embodiments of this disclosure;

[0022] Figure 2 This is a schematic diagram of the internal hole structure provided in an embodiment of this disclosure;

[0023] Figure 3 This is a flowchart of a method for machining the inner hole of an irregularly shaped part according to an embodiment of this disclosure;

[0024] Figure 4 This is a flowchart of another method for machining the inner hole of an irregularly shaped part according to an embodiment of this disclosure;

[0025] Figure 5 This is a schematic diagram of the irregularly shaped parts and counterweights provided in the embodiments of this disclosure assembled on the workbench;

[0026] Figure 6 This is a schematic diagram of the measuring tool used to detect the flatness of the worktable according to an embodiment of this disclosure.

[0027] The symbols in the diagram represent the following meanings:

[0028] 100. Irregularly shaped frame; 101. Intermediate cylinder; 102. Support leg; 1010. Inner hole;

[0029] 200, counterweight; 300, worktable; 400, measuring tool; 500, vertical milling machine. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0031] Irregularly shaped parts refer to parts whose center of gravity does not coincide with the center of their inner hole. Various irregularly shaped parts are frequently encountered in offshore cranes, such as irregularly shaped frames used to support rollers.

[0032] Figure 1 This is a structural schematic diagram of the irregularly shaped part provided in the embodiments of this disclosure, such as... Figure 1 As shown, the irregular frame 100 includes a central cylinder 101 and two support legs 102. The two support legs 102 are symmetrically located on opposite sides of the central cylinder 101, and the top of each support leg 102 is connected to the outer periphery of the central cylinder 101. The bottom of each support leg 102 is used to support itself on the ground.

[0033] The intermediate cylinder 101 has an inner hole 1010. The inner hole 1010 of the intermediate cylinder 101 requires extremely high precision after machining, especially the diameter tolerance and roundness requirements, as well as the straightness of the inner hole axis and the perpendicularity of the inner hole axis to the end face of the intermediate cylinder. Therefore, this disclosure provides a method for machining the inner hole of an irregularly shaped part. The inner hole of the above-mentioned part can be machined using the inner hole machining method provided in this disclosure to meet the precision requirements of the inner hole.

[0034] In this embodiment, the irregularly shaped part is an irregularly shaped frame 100. Before machining the irregularly shaped frame 100, the intermediate cylinder 101 in the irregularly shaped frame 100 has a through hole extending through both ends. In this embodiment, machining the inner hole refers to machining based on the existing through hole of the irregularly shaped frame 100, that is, milling the through hole to obtain an inner hole 1010 that meets the shape and size requirements. In other examples, the irregularly shaped part may also be other irregularly shaped parts.

[0035] Figure 2 This is a schematic diagram of the internal hole structure provided in an embodiment of this disclosure. See also... Figure 2 In this embodiment, the inner hole 1010 obtained after processing is a stepped hole.

[0036] This disclosure provides a method for machining the inner hole of an irregularly shaped part, such as... Figure 3 As shown, the processing method includes:

[0037] S301: Based on the target weight of the irregular part, the position of the theoretical center of gravity of the irregular part, and the position of the theoretical center of the inner hole, determine the target eccentric torque when the irregular part rotates about the center of the inner hole.

[0038] S302: Design the counterweight according to the target eccentric moment.

[0039] S303: Install the counterweight and irregularly shaped parts separately on the worktable.

[0040] S304: Machining internal holes on irregularly shaped parts.

[0041] When machining the inner hole of an irregularly shaped part using the machining method provided in this embodiment, the above machining method first determines the target eccentric torque when the irregularly shaped part rotates around the theoretical inner hole center based on the target weight of the irregularly shaped part, the position of the theoretical center of gravity of the irregularly shaped part, and the theoretical inner hole center. Then, a counterweight is designed based on the target eccentric torque, and the designed counterweight is assembled together with the irregularly shaped part on the (horizontally rotating) worktable. In this way, by adding the counterweight, the imbalance of the worktable after the irregularly shaped part is assembled on the worktable can be offset, so that the rotation center of the worktable can coincide with the theoretical inner hole center, and the worktable will not tilt. In this way, when machining the inner hole, the problem of worktable tilt caused by the misalignment of the theoretical center of gravity of the irregularly shaped part and the theoretical inner hole center can be compensated, thereby improving the machining accuracy of the inner hole.

[0042] In other words, the machining method for inner holes provided in this embodiment improves the machining accuracy of inner holes by pre-designing a counterweight and connecting the counterweight and the irregular part together on the worktable during machining.

[0043] This disclosure also provides another method for machining the inner hole of an irregularly shaped part, such as... Figure 4 As shown, the processing method includes:

[0044] S401: Based on the target weight of the irregular part, the position of the theoretical center of gravity of the irregular part, and the position of the theoretical inner hole center, determine the target eccentric torque when the irregular part rotates about the theoretical inner hole center as an axis.

[0045] The target weight of an irregularly shaped part is the theoretical weight required during the design of the irregularly shaped part.

[0046] In this embodiment, to improve the design efficiency of the counterweight, when determining the target eccentric moment, both the first eccentric moment obtained from the 3D model drawing and the second eccentric moment obtained from the actual irregular part are considered. In other words, the target eccentric moment is determined based on the first and second eccentric moments.

[0047] Optionally, step S401 is implemented in the following way:

[0048] 4011: Draw a 3D model of an irregularly shaped part.

[0049] In this embodiment, a three-dimensional model of the irregularly shaped part is first drawn using computer software.

[0050] 4012: Determine the positions of the model's centroid and the center of its inner hole in the 3D model drawing, and obtain the first eccentricity between the centroid and the center of the inner hole. The centroid's position corresponds to the theoretical centroid in the 3D model drawing. The center of the inner hole's position corresponds to the theoretical inner hole's position in the 3D model drawing.

[0051] In the 3D model drawing, determine the position of the center of gravity of the irregular part and the position of the center of the inner hole of the model, and measure the distance from the position of the center of gravity of the model to the position of the center of the inner hole of the model on the 3D model drawing, which is the first eccentricity.

[0052] 4013: Based on the first eccentricity and the target weight of the irregular part, the first eccentric torque is obtained.

[0053] Based on the first eccentricity obtained in step 4012 and the target weight of the irregular part, the first eccentric moment can be calculated. The first eccentric moment is equal to the product of the first eccentricity and the target weight of the irregular part.

[0054] 4014: Based on the 3D model drawing, determine the position of the theoretical center of gravity and the position of the theoretical inner hole center in the irregular part, and determine the second eccentricity of the position of the theoretical center of gravity from the position of the theoretical inner hole center.

[0055] Based on the 3D model drawing, the positions of the theoretical center of gravity and the theoretical inner hole center are determined in the irregular part, and the distance between the positions of the theoretical center of gravity and the theoretical inner hole center is measured to obtain the second eccentricity.

[0056] 4015: The second eccentric torque is obtained based on the second eccentricity and the target weight of the irregular part.

[0057] The second eccentric moment can be calculated based on the second eccentricity and the target weight of the irregular part.

[0058] The second eccentric moment is equal to the product of the target weight of the irregular part and the second eccentricity.

[0059] 4016: Take the larger of the first eccentric moment and the second eccentric moment as the target eccentric moment.

[0060] Since there will be dimensional discrepancies between the 3D model drawing and the actual irregular part, the larger of the first eccentric moment and the second eccentric moment is taken as the target eccentric moment. This ensures that the designed counterweight can eliminate the eccentric moment caused by the misalignment between the theoretical center of gravity and the theoretical inner hole center of the irregular part, thereby improving the design efficiency of the counterweight.

[0061] In other examples, either the first eccentric moment or the second eccentric moment can be used as the target eccentric moment.

[0062] S402: Design the counterweight according to the target eccentric moment.

[0063] Based on the target eccentric moment, determine the weight of the counterweight and its installation position on the worktable.

[0064] Based on the determined target eccentric moment, the weight of the counterweight and its installation position on the workbench can be preliminarily estimated.

[0065] That is, the product of the weight of the counterweight and the distance from the center of gravity of the counterweight to the theoretical center of the inner hole is equal to the target eccentric torque.

[0066] S403: Install the counterweight and irregularly shaped parts separately on the worktable.

[0067] Optionally, step S403 can be implemented in the following way:

[0068] 4031: The irregularly shaped part is clamped on the worktable, and the rotation center of the worktable coincides with the theoretical inner hole center.

[0069] Using the theoretical inner hole center of the irregularly shaped part as a reference, the axis of the theoretical inner hole of the part is aligned with the rotation center of the machine tool's horizontal rotary table. This allows the irregularly shaped part to rotate synchronously and coaxially with the table, facilitating machining.

[0070] 4032: The counterweight is clamped on the worktable, with the center of gravity of the counterweight, the theoretical center of gravity, and the rotation center of the worktable on the same straight line, and the center of gravity of the counterweight and the theoretical center of gravity on opposite sides of the rotation center.

[0071] Since the purpose of setting up counterweights is to counteract the tilting problem caused by irregularly shaped parts on the worktable, in order to keep the worktable balanced, the center of gravity of the counterweights, the theoretical center of gravity of the irregularly shaped parts, and the rotation center of the worktable are on the same straight line, and the center of gravity of the counterweights and the theoretical center of gravity of the irregularly shaped parts are located on opposite sides of the rotation center.

[0072] Figure 5 This is a schematic diagram of the irregularly shaped parts and counterweights provided in this embodiment being assembled on a workbench, as shown below. Figure 5As shown, when the irregularly shaped frame 100 to be processed is mounted on the worktable 300, the theoretical inner hole center of the irregularly shaped frame 100 is used as a reference, and the irregularly shaped frame 100 is clamped on the worktable 300 so that the rotation center of the worktable 300 coincides with the theoretical inner hole center. When the counterweight 200 is fixed on the worktable 300, it can be located on one side of the rotation center, and the theoretical center of gravity of the irregularly shaped part is located on the other side of the rotation center of the worktable 300.

[0073] S404: Inspect the flatness of a worktable that has counterweights and irregularly shaped parts clamped on it.

[0074] Alternatively, S404 can be implemented in the following ways:

[0075] First, with the worktable stationary, use measuring tools to measure the flatness of the horizontal worktable of the vertical lathe at different points.

[0076] Figure 6 This is a schematic diagram of the measuring tool used to detect the flatness of the worktable according to an embodiment of this disclosure, as shown below. Figure 6 As shown, during testing, the measuring instrument 400 is placed on the surface of the worktable 300.

[0077] Then, control the rotation of the worktable so that the measuring instrument detects the flatness corresponding to one rotation.

[0078] By controlling the vertical milling machine 500, the worktable 300 is changed from stationary to rotating, and the flatness of the circumference of the measuring tool in the worktable is obtained after the worktable 300 rotates one revolution.

[0079] Next, move the measuring tool 400 radially along the worktable and re-inspect to obtain the flatness of another circumference where the measuring tool is located. By moving the measuring tool again, the flatness of multiple circumferences where the measuring tool is located can be obtained, and thus the flatness of the entire worktable surface can be obtained.

[0080] The measuring tools mentioned above can be one of the following: dial indicator, micrometer, level, universal height gauge, etc.

[0081] 4042: Determine whether to adjust the counterweight based on the flatness.

[0082] If the flatness does not exceed the threshold (e.g., 0.02mm), it means that the flatness of the worktable meets the requirements, that is, the worktable is not eccentric or tilted. The rotation center of the worktable coincides with the theoretical inner hole center.

[0083] S405: If the flatness is greater than the threshold, the worktable will tilt, then adjust the counterweight.

[0084] In this embodiment, if the flatness does not meet the requirements, i.e., the flatness exceeds the threshold, it indicates that the worktable is eccentric. The rotation center of the worktable does not coincide with its center of gravity. The rotation center of the worktable does not coincide with the theoretical inner hole center. The worktable is tilted.

[0085] Alternatively, S405 can be implemented as follows:

[0086] 4051: Adjust the installation position and / or weight of the counterweight.

[0087] When adjusting the counterweight, you can keep the counterweight's installation position unchanged and adjust its weight. Alternatively, you can keep the counterweight's weight unchanged and adjust its installation position. Or, you can adjust both the counterweight's installation position and its weight simultaneously.

[0088] In other words, during adjustment, the counterweight can be kept in a fixed position while adjusting its weight, such as by adding or removing weight, to make the counterweight eccentric torque equal to the target eccentric torque.

[0089] Alternatively, while keeping the weight of the counterweight constant, the installation position of the counterweight can be adjusted, such as moving it closer to (or further away from) the theoretical inner hole center, to make the counterweight eccentric torque equal to the target eccentric torque.

[0090] 4052: Fix the adjusted counterweight to the workbench and check the flatness of the workbench again.

[0091] After installing the adjusted configuration block on the worktable, the flatness of the worktable is checked in exactly the same way as in step S404, so it will not be repeated here.

[0092] S406: Repeat steps S403-S405 to ensure that the flatness of the worktable meets the requirements.

[0093] The counterweights were continuously adjusted, and the flatness of the workbench was re-tested until it was below the threshold and met the requirements.

[0094] S407: Machining internal holes on irregularly shaped parts.

[0095] Alternatively, S407 can be implemented in the following manner:

[0096] 4071: For irregularly shaped parts, perform trial runs, rough machining, and semi-finishing in sequence, and check the roundness of the machined parts at the initial stage of each of the trial runs, rough machining, and semi-finishing.

[0097] When machining the inner hole, the process can be carried out in the order of trial run, rough machining, and semi-finishing. However, at the beginning of each machining process, the roundness of the machined part needs to be checked. If the roundness meets the requirements, the corresponding machining process continues; if the roundness does not meet the requirements, the counterweight needs to be adjusted according to step S405.

[0098] In other words, during the trial run, the roundness of the machined product is first checked. If the roundness meets the requirements, the trial run continues, followed by rough machining. During rough machining, the roundness of the machined product is checked again. If the roundness meets the requirements, rough machining continues, followed by semi-finishing. During semi-finishing, the roundness of the machined product is checked again. If the roundness meets the requirements, semi-finishing continues, followed by finishing.

[0099] 4072: Adjust the counterweight according to the roundness of the machined part.

[0100] If the roundness of the machined part does not meet the requirements, the counterweight needs to be readjusted.

[0101] During the trial run, the roundness of the machined parts is checked first. If the roundness does not meet the requirements, the trial run is stopped, and the counterweight is adjusted. After the counterweight is adjusted, the flatness of the worktable is checked, and the trial run is resumed only after the flatness meets the requirements. After the trial run, the roundness of the machined parts is checked again, and the above process is repeated until the trial run is completed, at which point rough machining begins.

[0102] During rough machining, the roundness of the machined parts is checked first. If the roundness does not meet the requirements, rough machining is stopped, the counterweight is adjusted, and the flatness of the worktable is checked after the counterweight adjustment. Rough machining continues only after the flatness meets the requirements. The roundness of the machined parts is checked again during rough machining, and the above process is repeated until rough machining is completed and semi-finishing begins.

[0103] During semi-finishing, the roundness of the machined parts is first checked. If the roundness does not meet the requirements, semi-finishing is stopped. The counterweight is adjusted, and after adjustment, the flatness of the worktable is checked. Semi-finishing continues only after the flatness meets the requirements. During semi-finishing, the roundness of the machined parts is checked again, and the above process is repeated until semi-finishing is completed, at which point finishing begins.

[0104] 4073: Precision machining of irregularly shaped parts.

[0105] The irregularly shaped parts are precision machined to ensure that the machined inner holes meet the requirements.

[0106] The specific steps for processing are as follows:

[0107] (1) Trial run. Using the center of the inner hole of the irregular part to be processed as the reference, make the axis of the inner hole of the irregular part to be processed coincide with the center of the horizontal rotary table of the machine tool. After aligning and clamping the irregular part, rotate the table horizontally and let the cutting tool run a few revolutions in the inner hole of the irregular part.

[0108] (2) Inspection. Use a dial indicator to check the roundness of the machined inner hole of the irregular part. If the measured roundness is out of tolerance, return to step S405 and readjust the weight and installation position of the counterweight. After adjustment, perform a test run and inspection again until the roundness meets the requirements.

[0109] (3) Rough turning. Using the center of the inner hole of the irregular part to be machined as a reference, align the axis of the inner hole of the irregular part with the center of the horizontally rotating worktable. After aligning and clamping the irregular part, rotate the worktable of the vertical lathe horizontally to rough turn the inner walls of each stepped hole and the stepped surfaces (such as...) of the irregular part's inner hole. Figure 2 As shown), leave a 2mm machining allowance.

[0110] (4) Inspection. Use a dial indicator to check the roundness of each stepped hole in the inner hole of the irregular part after rough machining. If the measured roundness is out of tolerance, return to step S405 and readjust the weight and installation position of the counterweight. Then perform trial machining and inspection again until the roundness meets the requirements.

[0111] (5) Semi-finish turning. Using the center of the inner hole of the irregular part to be machined as a reference, align the axis of the inner hole of the irregular part with the center of the horizontal rotary table. After aligning and clamping the irregular part, rotate the table of the vertical lathe horizontally to rough turn the inner walls of each stepped hole and the stepped surfaces of the inner hole of the irregular part (e.g., Figure 2 As shown), leave a machining allowance of 0.5mm.

[0112] (6) Inspection. Use a dial indicator to check the roundness of each stepped hole in the inner hole of the irregular part after semi-finish machining. If the measured roundness is out of tolerance, return to step S405 and readjust the weight and installation position of the counterweight. Then perform trial runs and inspections again until the roundness meets the requirements.

[0113] (7) Finish turning. Using the center of the inner hole of the irregular part to be machined as the reference, make the axis of the inner hole of the irregular part to be machined coincide with the center of the horizontal rotary table. After aligning and clamping the irregular part, rotate the table of the vertical lathe horizontally to finish turning the inner wall of each step hole and the step surface of the inner hole of the intermediate cylinder of the irregular part to the design requirements of the drawing.

[0114] S408: Inspect the inner diameter, roundness, cylindricity of the inner hole, and the perpendicularity of the inner hole axis to the end face of the irregular part.

[0115] Inspect the diameter, roundness, cylindricity of each stepped hole in the inner bore of irregularly shaped parts after precision machining, and the perpendicularity of the axis of the inner bore between the irregularly shaped parts and the end face of the irregularly shaped parts.

[0116] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for machining the inner hole of an irregularly shaped part, characterized in that, The processing method includes: Based on the target weight of the irregular part, the position of the theoretical center of gravity of the irregular part, and the position of the theoretical inner hole center, determine the target eccentric torque when the irregular part rotates about the theoretical inner hole center as an axis. Design a counterweight based on the target eccentric moment; The counterweight and the irregularly shaped part are respectively installed on the workbench; The inner hole is machined into the irregularly shaped part; The step of determining the target eccentric torque when the irregularly shaped part rotates about the center of the inner hole, based on the target weight of the irregularly shaped part, the position of the theoretical center of gravity of the irregularly shaped part, and the position of the theoretical center of the inner hole, includes: Draw a three-dimensional model of the irregularly shaped part; In the three-dimensional model drawing, the position of the model's center of gravity and the position of the center of the model's inner hole are determined, and the first eccentricity distance between the position of the model's center of gravity and the position of the center of the model's inner hole is obtained; The first eccentric torque is obtained based on the first eccentricity and the target weight of the irregular part; Based on the three-dimensional model drawing, the position of the theoretical center of gravity and the position of the theoretical inner hole center are determined in the irregular part, and a second eccentricity is determined between the position of the theoretical center of gravity and the position of the theoretical inner hole center. The second eccentric torque is obtained based on the second eccentricity and the target weight of the irregular part; The larger of the first eccentric moment and the second eccentric moment is taken as the target eccentric moment.

2. The processing method according to claim 1, characterized in that, The step of designing a counterweight based on the target eccentric moment includes: The weight of the counterweight and its installation position on the workbench are determined based on the target eccentric torque.

3. The processing method according to claim 2, characterized in that, The product of the weight of the counterweight and the distance from the center of gravity of the counterweight to the center of the theoretical inner hole is equal to the target eccentric moment.

4. The processing method according to any one of claims 1-3, characterized in that, The step of mounting the counterweight and the irregularly shaped part onto the workbench includes: The irregularly shaped part is clamped on the worktable, and the rotation center of the worktable coincides with the center of the theoretical inner hole; The counterweight is clamped on the workbench, with the center of gravity of the counterweight, the theoretical center of gravity, and the rotation center of the workbench on the same straight line, and the center of gravity of the counterweight and the theoretical center of gravity located on opposite sides of the rotation center.

5. The processing method according to any one of claims 1-3, characterized in that, The processing method further includes: The flatness of the worktable, in which the counterweight and the irregular part are clamped, is inspected; Based on the flatness, determine whether to adjust the counterweight.

6. The processing method according to claim 5, characterized in that, The method further includes: If the flatness is greater than the threshold, the workbench is tilted and the counterweight is adjusted.

7. The processing method according to claim 6, characterized in that, The adjustment of the counterweight includes: Adjust the installation position and / or weight of the counterweight; The adjusted counterweight is fixed on the workbench.

8. The processing method according to any one of claims 1-3, characterized in that, The process of machining the inner hole on the irregularly shaped part includes: The irregularly shaped parts are subjected to trial runs, rough machining, and semi-finishing in sequence, and the roundness of the machined parts is detected at the initial stage of each of the trial runs, rough machining, and semi-finishing. The counterweight is adjusted according to the roundness of the processed part; The adjusted counterweight is installed on the workbench, and the roundness of the machined part is continuously checked to ensure that the roundness of the machined part meets the requirements after the counterweight is adjusted. The irregularly shaped parts are precision machined.

9. The processing method according to any one of claims 1-3, characterized in that, The processing method further includes: The inner diameter, roundness, cylindricity, and perpendicularity of the inner hole axis to the end face of the irregular part are detected.

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