Machining method for drilling inclined oil hole in engine cylinder cover

Abstract

The invention discloses a machining method for drilling an inclined oil hole in an engine cylinder cover, and relates to the technical field of engine production. And through precise analysis and adjustment of various parameters, the deviation in the machining process can be corrected in time, the machining precision and consistency are improved, and the parameters such as the feeding speed, the rotating speed and the cutting depth of the drill bit can be monitored in real time. And abnormal conditions in the machining process can be found in time through real-time monitoring, a basis is provided for subsequent adjustment, and the stability of the machining process is guaranteed. Through precise analysis and adjustment of various parameters, deviation in the machining process can be corrected in time, the machining precision and consistency are improved, and parameters such as the feeding speed, the rotating speed and the cutting depth of the drill bit can be monitored in real time. And abnormal conditions in the machining process can be found in time through real-time monitoring, a basis is provided for subsequent adjustment, and the stability of the machining process is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of engine manufacturing technology, specifically a method for drilling oblique oil holes in engine cylinder heads. Background Technology

[0002] For example, the method for machining oblique oil holes in engine cylinder heads, as disclosed in patent publication number CN105345519A, includes a clamping process. The clamping process uses a special fixture and includes the following steps: fixing the fixture on a machine tool; using a positioning mechanism on the fixture to position the cylinder head; and using a clamping mechanism on the fixture to fix the cylinder head, thus completing the clamping. The use of a special fixture in the cylinder head clamping process ensures that the oblique oil hole at the cylinder head installation position is aligned with the direction of the CNC machine tool drill bit. This allows the cylinder head to be directly machined on the CNC machine tool after clamping, greatly reducing the troublesome angle adjustment problem encountered by workers when machining with a radial drilling machine, facilitating worker operation, and improving the machining efficiency of oblique oil holes.

[0003] However, in the process of using the above and similar technical solutions, since the drill bit needs to penetrate deep into the cylinder head for processing, when the drill bit malfunctions, it cannot be detected in time, leading to a series of abnormalities such as drill bit breakage. Therefore, in order to address this situation, we propose a more convenient and practical method for machining inclined oil holes to meet the usage requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a method for drilling oblique oil holes in engine cylinder heads to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for drilling oblique oil holes in an engine cylinder head, comprising the following steps:

[0006] Data acquisition: Based on big data and real-time engine cylinder head shape data from sensors, engine cylinder head shape data is obtained.

[0007] Drilling path planning: Based on the engine cylinder head shape data, a CNC machine tool is used as the machining tool to plan the drilling path of the inclined oil hole and obtain the drilling path;

[0008] Real-time monitoring: Based on the drilling path, the engine cylinder head is fixed in the CNC machining tool, and the feed rate, rotation speed and cutting depth of the drill bit are monitored in real time during the CNC machining process to obtain real-time monitoring data;

[0009] Feedback adjustment, based on real-time monitoring data, optimizes and adjusts the parameters of the CNC machine tool, adjusting the feed rate, rotation speed and depth of cut of the drill bit during the CNC machine tool machining process, and obtains the adjustment results;

[0010] Drilling is performed by inputting the adjusted CNC machine tool parameters into the CNC machine tool based on the adjustment results, and modifying the drilling parameters to complete the machining of the inclined oil hole.

[0011] Quality verification involves using a coordinate measuring machine to inspect the dimensional accuracy, shape accuracy, and positional accuracy of the inclined oil hole, and comparing the inspection results with the design requirements.

[0012] Furthermore, the drilling path planning includes the following steps:

[0013] L1. Path planning: Based on the engine cylinder head shape data, the position and angle of the inclined oil hole, the optimal drilling path is calculated to obtain the initial path data.

[0014] L2, Path optimization: Based on the initial path data, the drilling path is optimized and adjusted to obtain the optimized path data;

[0015] L3, Path Verification: Based on the optimized path data, the rationality and effectiveness of the path are verified through simulation to obtain the drilling path.

[0016] Furthermore, the feedback adjustment includes the following steps:

[0017] A1. Data comparison and analysis: Based on real-time monitoring data, collect various parameters of the drill bit during CNC machine tool processing and compare them with preset processing parameters to obtain comparison results. Analyze whether there are deviations or abnormalities in the processing parameters, identify the parameters that need to be adjusted, and obtain analysis results.

[0018] A2. Deviation assessment: Based on the comparison and analysis results, assess the degree of deviation and its impact on the processing effect, and determine whether the drilling path deviates from the target position to obtain the assessment result;

[0019] A3. Adjustment strategy generation: Based on the evaluation results, an adjustment strategy is generated.

[0020] A4. Adjustment execution: Based on the adjustment strategy, adjust the feed rate, rotation speed and machining parameters of the drill bit in real time during the CNC machine tool machining process to obtain adjustment parameter data;

[0021] A5. Feedback verification: Based on the adjusted parameter data, real-time monitoring is conducted to verify whether the adjusted processing meets expectations and to obtain the adjustment results.

[0022] Furthermore, the adjustment strategy generation includes the following steps:

[0023] S1. Drill bit feed rate adjustment: Based on the evaluation results and engine cylinder head shape data, the drill bit feed rate is recalculated to obtain the drill bit feed rate adjustment result.

[0024] S2. Drill bit speed adjustment: Based on the drill bit feed rate adjustment result, the drill bit speed is dynamically adjusted according to the material, weight and shape of the engine cylinder head to obtain the drill bit speed adjustment result;

[0025] S3. Cutting depth adjustment: Based on real-time monitoring data, adjust the cutting depth of the drill bit to obtain the cutting depth adjustment result.

[0026] Furthermore, the system employs multi-sensor fusion technology to collect data in real time, including the morphological features of the engine cylinder head, hole coordinates, and machining reference surface data. The collected data is then processed for noise reduction and feature extraction.

[0027] Furthermore, the drilling process employs a dedicated high-precision deep-hole drilling tool, combined with a high-pressure internal cooling system to cool and remove chips from the cutting area.

[0028] Furthermore, the quality verification includes the following steps:

[0029] M1. Dimensional accuracy inspection: A coordinate measuring machine is used to scan the cross-section of the inner wall of the inclined oil hole to obtain diameter and roundness data, which are then compared with the design tolerance zone to determine whether there are any errors.

[0030] M2, Shape accuracy inspection, evaluates taper error and straightness deviation by measuring the fit between the axis of the inclined oil hole and the theoretical curved surface;

[0031] M3, Position accuracy detection, based on the cylinder head reference coordinate system, calculates the spatial deviation between the center point of the inclined oil hole inlet and the design coordinates;

[0032] M4. Surface quality assessment: Use an optical microscope to check the surface roughness of the hole wall for microcracks and burr defects.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] This method for drilling angled oil holes in engine cylinder heads, through precise analysis and adjustment of various parameters, can promptly correct deviations during the machining process, improving machining accuracy and consistency. It also allows for real-time monitoring of parameters such as drill bit feed rate, rotational speed, and depth of cut. Real-time monitoring can promptly detect anomalies during machining, providing a basis for subsequent adjustments and ensuring the stability of the machining process. This method is highly practical and suitable for widespread adoption.

[0035] Simultaneously, the optimal drilling path is calculated using engine cylinder head shape data, the location and angle of the inclined oil hole. By comprehensively considering the cylinder head shape and the specific requirements of the inclined oil hole, the planned path can minimize interference and errors during the machining process, thereby improving machining efficiency and quality. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the overall process of the present invention;

[0037] Figure 2 This is a schematic diagram of the drilling path planning process of the present invention;

[0038] Figure 3 This is a schematic diagram of the feedback adjustment process of the present invention;

[0039] Figure 4 This is a schematic diagram of the adjustment strategy generation process of the present invention;

[0040] Figure 5 This is a schematic diagram illustrating the overall process principle of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the engine manufacturing process, a method for machining oblique oil holes is required. The oblique oil hole machining method provided by this invention is specifically designed for machining oblique oil holes in the cylinder head during engine manufacturing. When using this method, it is necessary to ensure that all equipment is in good working condition, check the wear of the cutting tools, and ensure that the coolant is sufficient. Before machining the oblique oil holes, it is necessary to accurately measure the shape data of the cylinder head and the position and angle of the oblique oil holes to ensure the accuracy of the data. Based on the measurement data, an algorithm is used to plan the drilling path precisely to reduce interference and errors during the machining process. During the machining process, it is necessary to monitor the machining status in real time, such as the wear of the cutting tools and the flow rate of the coolant, and adjust the machining parameters in a timely manner to ensure the machining quality.

[0043] like Figures 1-5As shown, this invention provides a technical solution: a method for machining oblique oil holes in an engine cylinder head, comprising the following steps: data acquisition, obtaining engine cylinder head shape data based on big data and real-time engine cylinder head shape data from sensors; drilling path planning, planning the oblique oil hole drilling path based on the engine cylinder head shape data, using a CNC machine tool as the machining tool; real-time monitoring, fixing the engine cylinder head in the CNC machine tool based on the drilling path, and monitoring the drill bit's feed rate, rotational speed, and depth of cut in real time during the CNC machine tool machining process, obtaining real-time monitoring data; feedback adjustment, optimizing and adjusting the CNC machine tool parameters based on the real-time monitoring data, and adjusting the CNC machine tool's... During the drilling process, the drill bit's feed rate, rotational speed, and depth of cut are adjusted. For drilling execution, based on the adjustments, the adjusted CNC machine tool parameters are input into the CNC machine tool, and the drilling parameters are modified to complete the machining of the inclined oil hole. For quality verification, a coordinate measuring machine is used to inspect the dimensional accuracy, shape accuracy, and positional accuracy of the inclined oil hole. The inspection results are compared with the design requirements. Multi-sensor fusion technology is used for data acquisition, real-time collection of the engine cylinder head's morphological features, hole coordinates, and machining reference surface data. The collected data undergoes noise reduction and feature extraction. During drilling execution, a dedicated high-precision deep-hole drill bit is used, combined with a high-pressure internal cooling system to cool the cutting area and remove chips.

[0044] It is important to note that by employing big data and sensor technology to capture the shape information of the engine cylinder head in real time, the collected physical signals are converted into digital signals. After data processing and analysis, based on the shape data of the engine cylinder head, the drilling path is planned using the programming system built into the CNC machine tool or professional CAM (Computer-Aided Manufacturing) software. The CNC machine tool is equipped with an adaptive control system that can automatically generate instructions. After the engine cylinder head is firmly fixed in the CNC machining tool, various sensors installed on the CNC machine tool monitor the feed rate, rotation speed, and depth of cut of the drill bit in real time. The control system of the CNC machine tool will optimize and adjust the machining parameters. The adjusted CNC machine tool parameters are input into the control system of the CNC machine tool. The control system controls the moving parts of the drilling machine according to these parameters, driving the drill bit to perform drilling according to the planned drilling path. A coordinate measuring machine is used to detect the dimensional accuracy, shape accuracy, and positional accuracy of the machined inclined oil hole.

[0045] like Figure 2 As shown, the drilling path planning includes the following steps: path planning, which calculates the optimal drilling path based on the engine cylinder head shape data, the position and angle of the inclined oil hole, and obtains the initial path data; path optimization, which optimizes and adjusts the drilling path based on the initial path data to obtain the optimized path data; and path verification, which verifies the rationality and effectiveness of the path through simulation based on the optimized path data to obtain the drilling path.

[0046] It is important to note that during use, the engine cylinder head shape data includes the overall geometric information of the cylinder head, such as the curvature and thickness variations of each surface. The position and angle of the inclined oil hole clearly define the specific spatial location and tilt direction of the inclined oil hole to be machined on the cylinder head. Using specific algorithms (such as the shortest path algorithm and obstacle avoidance algorithm), the optimal drilling path from the drilling start point to the target point is calculated. The initial path data is then analyzed in depth to check for factors that may cause machining problems. The initial path is optimized and adjusted by comprehensively considering multiple factors. Finally, the drilling process is reproduced in a computer simulation environment. By calculating the optimal path and optimizing and adjusting the path, drilling path planning reduces the idle stroke and unnecessary movement of the drill bit, thus shortening the machining time.

[0047] like Figure 3 As shown, the feedback adjustment includes the following steps: Data comparison and analysis: Based on real-time monitoring data, various parameters of the drill bit during CNC machine tool machining are collected and compared with preset machining parameters to obtain comparison results. The analysis is performed to determine if there are any deviations or anomalies in the machining parameters, identify the parameters that need adjustment, and obtain analysis results. Deviation assessment: Based on the comparison and analysis results, the degree of deviation and its impact on the machining effect are assessed, and it is determined whether the drilling path deviates from the target position, obtaining assessment results. Adjustment strategy generation: Based on the assessment results, an adjustment strategy is generated. Adjustment execution: Based on the adjustment strategy, the feed rate, rotational speed, and machining parameters of the drill bit during CNC machine tool machining are adjusted in real time, obtaining adjustment parameter data. Feedback verification: Based on the adjustment parameter data, real-time monitoring is performed to verify whether the adjusted machining meets expectations, obtaining adjustment results.

[0048] It is important to note that various sensors monitor parameters such as drill bit feed rate, rotation speed, and depth of cut in real time, and transmit this data to the CNC machine tool control system. The system compares the real-time collected parameters with the pre-set machining parameters one by one. By comparing, it analyzes whether there are any deviations or anomalies in the machining parameters. At the same time, by monitoring the drill bit's movement trajectory and position information, it determines whether the drilling path deviates from the target position. Based on the deviation assessment results, the system generates adjustment strategies according to preset rules and algorithms. The system adjusts the drill bit feed rate, rotation speed, and machining parameters in real time during the CNC machine tool machining process. Through real-time monitoring and comparative analysis, deviations in machining parameters can be detected and adjusted in a timely manner, effectively avoiding machining errors caused by parameter deviations, thereby improving the dimensional accuracy, shape accuracy, and positional accuracy of the inclined oil hole.

[0049] like Figure 4As shown, the adjustment strategy generation includes the following steps: drill bit feed rate adjustment, based on the evaluation results and engine cylinder head shape data, the drill bit feed rate is recalculated to obtain the drill bit feed rate adjustment result; drill bit speed adjustment, based on the drill bit feed rate adjustment result, the drill bit speed is dynamically adjusted according to the material, weight and shape of the engine cylinder head to obtain the drill bit speed adjustment result; and depth of cut adjustment, based on real-time monitoring data, the drill bit depth of cut is adjusted to obtain the depth of cut adjustment result.

[0050] It is important to note that, firstly, based on the results of the deviation assessment, the problem with the current drill bit feed rate should be identified. For example, is it too fast, leading to a rough surface finish, or too slow, affecting machining efficiency? Based on the drill bit feed rate adjustment results, factors such as the material, weight, and shape of the engine cylinder head should be fully considered. The drill bit speed should be dynamically adjusted according to these factors to obtain the final drill bit speed adjustment result. Furthermore, it should be determined whether the current depth of cut is appropriate, better adapting to the machining requirements of different parts, avoiding machining errors caused by improper feed rate, and improving the dimensional accuracy and surface quality of the inclined oil hole.

[0051] Quality verification includes the following steps: dimensional accuracy inspection, using a coordinate measuring machine to scan the cross-section of the inner wall of the inclined oil hole, obtaining diameter and roundness data, comparing them with the design tolerance zone, and determining whether there are errors; shape accuracy inspection, by measuring the fit between the axis of the inclined oil hole and the theoretical curved surface, evaluating the taper error and straightness deviation; positional accuracy inspection, based on the cylinder head reference coordinate system, calculating the spatial deviation between the center point of the inclined oil hole inlet and the design coordinates; and surface quality assessment, using an optical microscope to inspect the surface roughness of the hole wall for microcracks and burr defects.

[0052] It is important to note that the coordinate measuring machine (CMM) scans the inner wall cross-section of the inclined oil hole along a preset trajectory using a probe. During the scanning process, the probe accurately records the spatial coordinates of multiple points on the cross-section. By processing and analyzing the data from these points, the diameter and roundness of the inclined oil hole on that cross-section are calculated. The measured diameter and roundness data are compared with the design tolerance zone. By selecting multiple feature points on the inner wall of the inclined oil hole, a mathematical algorithm is used to fit the axis of the inclined oil hole. Through analysis and calculation of the measurement data, the specific values ​​of taper error and straightness deviation are obtained, thereby determining whether the shape accuracy meets the design requirements. This allows for a comprehensive and accurate detection of problems such as dimensional deviations, shape errors, positional offsets, and surface defects in the inclined oil hole.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A method for drilling oblique oil holes in an engine cylinder head, characterized in that: Includes the following steps: Data acquisition: Based on big data and real-time engine cylinder head shape data from sensors, engine cylinder head shape data is obtained. Drilling path planning: Based on the engine cylinder head shape data, a CNC machine tool is used as the machining tool to plan the drilling path of the inclined oil hole and obtain the drilling path; Real-time monitoring: Based on the drilling path, the engine cylinder head is fixed in the CNC machining tool, and the feed rate, rotation speed and cutting depth of the drill bit are monitored in real time during the CNC machining process to obtain real-time monitoring data; Feedback adjustment, based on real-time monitoring data, optimizes and adjusts the parameters of the CNC machine tool, adjusting the feed rate, rotation speed and depth of cut of the drill bit during the CNC machine tool machining process, and obtains the adjustment results; Drilling is performed by inputting the adjusted CNC machine tool parameters into the CNC machine tool based on the adjustment results, and modifying the drilling parameters to complete the machining of the inclined oil hole. Quality verification involves using a coordinate measuring machine to inspect the dimensional accuracy, shape accuracy, and positional accuracy of the inclined oil hole, and comparing the inspection results with the design requirements.

2. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The borehole path planning includes the following steps: L1. Path planning: Based on the engine cylinder head shape data, the position and angle of the inclined oil hole, the optimal drilling path is calculated to obtain the initial path data. L2, Path optimization: Based on the initial path data, the drilling path is optimized and adjusted to obtain the optimized path data; L3, Path Verification: Based on the optimized path data, the rationality and effectiveness of the path are verified through simulation to obtain the drilling path.

3. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The feedback adjustment includes the following steps: A1. Data comparison and analysis: Based on real-time monitoring data, collect various parameters of the drill bit during CNC machine tool processing and compare them with preset processing parameters to obtain comparison results. Analyze whether there are deviations or abnormalities in the processing parameters, identify the parameters that need to be adjusted, and obtain analysis results. A2. Deviation assessment: Based on the comparison and analysis results, assess the degree of deviation and its impact on the processing effect, and determine whether the drilling path deviates from the target position to obtain the assessment result; A3. Adjustment strategy generation: Based on the evaluation results, an adjustment strategy is generated. A4. Adjustment execution: Based on the adjustment strategy, adjust the feed rate, rotation speed and machining parameters of the drill bit in real time during the CNC machine tool machining process to obtain adjustment parameter data; A5. Feedback verification: Based on the adjusted parameter data, real-time monitoring is conducted to verify whether the adjusted processing meets expectations and to obtain the adjustment results.

4. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The adjustment strategy generation includes the following steps: S1. Drill bit feed rate adjustment: Based on the evaluation results and engine cylinder head shape data, the drill bit feed rate is recalculated to obtain the drill bit feed rate adjustment result. S2. Drill bit speed adjustment: Based on the drill bit feed rate adjustment result, the drill bit speed is dynamically adjusted according to the material, weight and shape of the engine cylinder head to obtain the drill bit speed adjustment result; S3. Cutting depth adjustment: Based on real-time monitoring data, adjust the cutting depth of the drill bit to obtain the cutting depth adjustment result.

5. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The system employs multi-sensor fusion technology to collect data in real time, including the morphological features of the engine cylinder head, hole coordinates, and machining reference surface data. The collected data is then processed for noise reduction and feature extraction.

6. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The drilling process employs a dedicated high-precision deep hole drilling tool, combined with a high-pressure internal cooling system to cool and remove chips from the cutting area.

7. The method for drilling oblique oil holes in an engine cylinder head according to claim 1, characterized in that: The quality verification includes the following steps: M1. Dimensional accuracy inspection: A coordinate measuring machine is used to scan the cross-section of the inner wall of the inclined oil hole to obtain diameter and roundness data, which are then compared with the design tolerance zone to determine whether there are any errors. M2, Shape accuracy inspection, evaluates taper error and straightness deviation by measuring the fit between the axis of the inclined oil hole and the theoretical curved surface; M3, Position accuracy detection, based on the cylinder head reference coordinate system, calculates the spatial deviation between the center point of the inclined oil hole inlet and the design coordinates; M4. Surface quality assessment: Use an optical microscope to check the surface roughness of the hole wall for microcracks and burr defects.

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