Method for improving honing cylindricity of connecting rod

Abstract

The invention belongs to the technical field of connecting rod machining, and discloses a method for improving the honing machining cylindricity of a connecting rod, and the method comprises the following steps: S1, optimizing honing machining parameters; s2, a workpiece clamping mode is improved; s3, selecting an improved honing tool; s4, enhancing the control of the cooling liquid system; s5, monitoring and real-time feedback in the machining process are enhanced; s6, earlier-stage treatment of the workpiece is enhanced; and S7, adopting a dynamic compensation technology. A special flexible clamp and supporting points in reasonable layout are adopted for clamping and supporting the workpiece, the stability of the workpiece is greatly enhanced, the deformation problem in the machining process is avoided, meanwhile, a high-performance honing stone and an optimized cooling liquid system are selected, the grinding effect and the heat management capacity are further improved, and the machining efficiency is improved. By means of the method, powerful guarantee is provided for high-precision machining, by means of implementation of the comprehensive measures, the machining quality of the connecting rod is greatly improved, and the controllability and stability of the production process are remarkably enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of connecting rod processing, and in particular relates to a method for improving the cylindricity of connecting rod honing processing. Background Art

[0002] Connecting rod honing is a high-precision machining process, mainly used for final machining of connecting rod big head holes and other parts to obtain high-quality machined surfaces. Honing (also known as boring) is a finishing process of the finished surface using an oilstone (also known as a honing bar) embedded in the honing head. During the honing process, the main shaft of the honing machine drives the honing head to rotate, and the crank-connecting rod mechanism on the machine tool drives the honing head to reciprocate. Therefore, the main motion of honing is the spiral motion of the honing bar.

[0003] However, in the process of connecting rod honing, the control of cylindricity is a key issue. During the honing process, due to factors such as the contact between the tool and the workpiece, processing parameters (such as feed rate, speed, etc.) and wear of the honing stone, processing errors are likely to occur. During the processing of the connecting rod, especially after honing, thermal deformation, mechanical deformation or insufficient rigidity may occur. The honing stone is a key tool in the honing process, but as the use time increases, the honing stone may wear, and uneven wear will lead to uneven processing. The cylindricity deviation of the connecting rod may have been rough-machined or have certain machining traces before honing. These differences in initial states (such as uneven surface or uneven diameter) may affect the cylindricity control during honing. The flow, temperature and cleanliness of the coolant will also affect the cylindricity error generated during the honing process. The parameters in the honing process, such as feed speed, working pressure, type and particle size of the honing stone, will affect the cylindricity. The above processes will affect the cylindricity of the connecting rod during honing, and improvements are urgently needed. Summary of the invention

[0004] The object of the present invention is to provide a method for improving the cylindricity of a connecting rod during honing, so as to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a method for improving the cylindricity of a connecting rod by honing, comprising the following steps:

[0006] S1: Optimize honing processing parameters;

[0007] S2: Improve the workpiece clamping method;

[0008] S3: Improve honing tool selection;

[0009] S4: Enhanced control of the coolant system;

[0010] S5: Strengthen monitoring and real-time feedback during processing;

[0011] S6: Strengthen the preliminary processing of workpieces;

[0012] S7: Adopts dynamic compensation technology;

[0013] The optimized honing processing parameters include feed speed and speed setting, cutting depth control, and honing pressure setting; the improved workpiece clamping method includes fixture selection and adding workpiece support points; the improved honing tool selection includes honing stone selection, honing stone shape and size; the enhanced coolant system control includes coolant flow setting, coolant temperature, and coolant selection; the enhanced monitoring and real-time feedback during the processing includes online cylindricity detection and automated feedback control; the enhanced workpiece pre-processing includes rough machining quality control; and the use of dynamic compensation technology includes a dynamic compensation device.

[0014] As a further technical solution of the present invention, the feed speed and rotation speed setting include setting the feed speed to 0.3 mm per minute, and according to the material and specifications of the connecting rod, reasonably adjusting the feed speed to ensure the uniformity of the processing, the rotation speed is set to 500 revolutions per minute, and the cutting depth control includes setting the initial cutting depth to 0.05 mm to avoid deformation of the workpiece caused by excessive cutting force, and reducing the subsequent cutting depth by 0.02 mm each time, gradually reducing the cutting depth to ensure a gradual improvement in the processing accuracy, and the honing pressure is set to 0.5 MPa to ensure that the cutting force is evenly distributed to avoid deformation of the workpiece or poor surface quality caused by excessive or insufficient pressure.

[0015] As a further technical solution of the present invention, the fixture selection includes using a special flexible fixture to fix the connecting rod through three support points to ensure that no unnecessary deformation occurs during the honing process. The fixture material is 20CrMnTi to ensure that the fixture does not deform under high pressure. The increase in workpiece support points includes using at least 4 support points to ensure stability based on the length and diameter of the connecting rod. The support point spacing is set to 1 / 4 of the workpiece length to avoid bending moment.

[0016] As a further technical solution of the present invention, the honing stone selection includes selecting a high-density ceramic honing stone with a particle size of 100-120 mesh to ensure high-precision grinding and a hardness of HRC60-65. The shape and size of the honing stone are cylindrical honing stones to ensure uniform grinding. The honing stone size is 40 mm in diameter and 80 mm in length.

[0017] As a further technical solution of the present invention, the coolant flow setting includes setting it to 10 liters per minute to ensure that sufficient coolant flows into the processing area during the processing to avoid overheating affecting the processing accuracy. The coolant temperature is maintained within the range of 18°C±2°C to avoid thermal deformation of the workpiece due to excessively high or low coolant temperature. The coolant type selects an emulsified water-based coolant, which has good cooling performance and can effectively remove chips.

[0018] As a further technical solution of the present invention, the online cylindricity detection includes selecting a laser cylindricity measuring instrument with an accuracy of 0.001mm, monitoring the cylindricity changes of the workpiece in real time, performing cylindricity detection once every 1 minute, and adjusting the processing parameters according to the detection results. The automatic feedback control includes using a PLC-based automatic feedback system to automatically adjust the feed speed or honing pressure when it is detected that the cylindricity exceeds a predetermined range. When it is detected that the cylindricity deviation is greater than 0.005mm, the system automatically adjusts the feed speed or honing pressure to a change range of ±0.05mm / min.

[0019] As a further technical solution of the present invention, the rough machining quality control includes requiring the surface roughness of the workpiece after rough machining to be Ra≤1.6μm, controlling the dimensional tolerance within ±0.05mm, and using aging treatment or low-temperature heat treatment to remove internal stress to ensure that the workpiece does not deform during subsequent honing processing.

[0020] As a further technical solution of the present invention, the dynamic compensation device includes a dynamic compensation system that uses a high-precision linear displacement sensor combined with a servo motor system, and monitors the change in the cylindricity of the workpiece in real time during the honing process, and compensates based on the real-time data, controlling the deviation range to not exceed 0.003mm.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The present invention significantly improves the processing accuracy and efficiency by comprehensively optimizing each link of the connecting rod honing process. In terms of processing parameters, the feed speed, rotation speed, cutting depth and honing pressure are finely controlled to ensure the smoothness and efficiency of the processing process and effectively reduce the processing errors caused by improper parameters. In terms of workpiece clamping and support, special flexible clamps and reasonably arranged support points are used to greatly enhance the stability of the workpiece and avoid deformation problems during processing. At the same time, the selection of high-performance honing stones and optimized coolant systems further enhances the grinding effect and thermal management capabilities, providing a strong guarantee for high-precision processing. The implementation of these comprehensive measures not only greatly improves the processing quality of the connecting rod, but also significantly enhances the controllability and stability of the production process.

[0023] (2) The present invention further improves the intelligence and automation level of connecting rod honing by introducing advanced online monitoring and automated feedback control technology, strengthening the pre-processing of workpieces and adopting dynamic compensation devices. The combination of online cylindricity detection and PLC automated feedback system realizes real-time monitoring and intelligent adjustment of processing quality, effectively prevents the accumulation of processing deviations, and ensures the continuous stability of processing accuracy. At the same time, through strict rough processing quality control and the application of dynamic compensation technology, the initial state difference of the workpiece and the deviation during the processing are further eliminated, thereby improving the cylindricity consistency of the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall process flow of the present invention;

[0025] Figure 2 A schematic diagram of a process for optimizing honing processing parameters according to the present invention;

[0026] Figure 3 A schematic diagram of the process of improving the workpiece clamping method of the present invention;

[0027] Figure 4 A schematic diagram of the process for improving the selection of honing tools according to the present invention;

[0028] Figure 5 A schematic diagram of a flow chart for enhancing the control of a coolant system according to the present invention;

[0029] Figure 6 A schematic diagram of a process for enhancing monitoring and real-time feedback during the processing of the present invention;

[0030] Figure 7 A schematic diagram of the process of strengthening the preliminary processing of the workpiece according to the present invention;

[0031] Figure 8 This is a schematic diagram of the process of using the dynamic compensation technology in the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 8 As shown, in an embodiment of the present invention, a method for improving the cylindricity of a connecting rod during honing comprises the following steps:

[0034] S1: Optimize honing processing parameters;

[0035] S2: Improve the workpiece clamping method;

[0036] S3: Improve honing tool selection;

[0037] S4: Enhanced control of the coolant system;

[0038] S5: Strengthen monitoring and real-time feedback during processing;

[0039] S6: Strengthen the preliminary processing of workpieces;

[0040] S7: Adopts dynamic compensation technology;

[0041] Optimize the honing processing parameters including feed speed and speed setting, cutting depth control, and honing pressure setting; improve the workpiece clamping method including fixture selection and adding workpiece support points; improve the honing tool selection including honing stone selection, honing stone shape and size; enhance the control of the coolant system including coolant flow setting, coolant temperature, and coolant selection; strengthen the monitoring and real-time feedback during the processing including online cylindricity detection and automated feedback control; strengthen the preliminary processing of the workpiece including rough machining quality control; and adopt dynamic compensation technology including dynamic compensation device.

[0042] By optimizing honing parameters, improving clamping and tool selection, the stability and accuracy of the processing process are ensured; enhancing the control of the coolant system effectively improves the cooling and lubrication effects and reduces thermal deformation; strengthening monitoring and real-time feedback realizes online detection and timely adjustment of processing quality; combining pre-processing with dynamic compensation technology further improves the consistency and accuracy of processing. The comprehensive application of these methods can not only improve the processing quality of connecting rods, but also improve production efficiency and reduce scrap rate.

[0043] like Figure 2 As shown, the feed speed and rotation speed settings include setting the feed speed to 0.3 mm per minute, and according to the material and specifications of the connecting rod, reasonably adjusting the feed speed to ensure the uniformity of the processing, the rotation speed is set to 500 revolutions per minute, and the cutting depth control includes setting the initial cutting depth to 0.05 mm to avoid deformation of the workpiece caused by excessive cutting force, and reducing the subsequent cutting depth by 0.02 mm each time, gradually reducing the cutting depth to ensure a gradual improvement in processing accuracy, and setting the honing pressure to 0.5 MPa to ensure that the cutting force is evenly distributed to avoid deformation of the workpiece or poor surface quality caused by excessive or insufficient pressure.

[0044] By finely setting the honing processing parameters such as feed speed, rotation speed, cutting depth and honing pressure, this method significantly improves the accuracy and efficiency of connecting rod processing. The matching of feed speed and rotation speed ensures smooth and uniform processing and avoids quality problems caused by improper parameters. The gradually decreasing cutting depth strategy not only protects the workpiece from damage caused by excessive cutting force, but also promotes the steady improvement of processing accuracy. Reasonable honing pressure setting ensures the uniform application of cutting force and prevents workpiece deformation and surface defects.

[0045] like Figure 3 As shown, the fixture selection includes the use of a special flexible fixture to fix the connecting rod through three support points to ensure that it does not undergo any unnecessary deformation during the honing process. The fixture material is 20CrMnTi to ensure that the fixture does not deform under high pressure. Increasing the workpiece support points includes using at least 4 support points to ensure stability based on the length and diameter of the connecting rod. The support point spacing is set to 1 / 4 of the workpiece length to avoid bending moment.

[0046] By enhancing the stability and precision of the connecting rod during honing, the application of special flexible clamps and high-strength materials ensures that the clamp is stable and does not deform under high loads, providing reliable support for the connecting rod. By increasing the number of support points and reasonably setting the support point spacing, the stress concentration during processing is effectively dispersed, avoiding deformation of the connecting rod due to bending moment. These improvement measures work together to not only improve the processing quality of the connecting rod, but also extend the service life of the clamp.

[0047] like Figure 4 As shown, the honing stone selection includes selecting a high-density ceramic honing stone with a particle size of 100-120 mesh to ensure high-precision grinding and a hardness of HRC60-65. The shape and size of the honing stone are cylindrical honing stones to ensure uniform grinding. The honing stone size is 40mm in diameter and 80mm in length.

[0048] The high-density ceramic material ensures the high wear resistance and high-precision grinding ability of the honing stone, the appropriate particle size and hardness ensure the fine and uniform grinding effect, and the selection of cylindrical honing stone and its reasonable size further promotes the uniformity and stability of grinding and avoids uneven wear during processing. The combined effect of these optimization measures not only improves the surface finish and cylindricity of the connecting rod, but also extends the service life of the honing stone.

[0049] like Figure 5As shown, the coolant flow setting includes setting it to 10 liters per minute to ensure that there is enough coolant flowing into the processing area during the processing to avoid overheating affecting the processing accuracy. The coolant temperature is maintained in the range of 18℃±2℃ to avoid thermal deformation of the workpiece due to excessively high or low coolant temperature. The coolant type is an emulsified water-based coolant, which has good cooling performance and can effectively remove chips.

[0050] By carefully setting the coolant flow, temperature and type, this method effectively improves the thermal management and chip removal capabilities of the connecting rod honing process. Adequate coolant flow ensures sufficient cooling of the processing area, avoiding the reduction of processing accuracy caused by overheating. The appropriate coolant temperature range effectively prevents the deformation of the workpiece due to thermal stress and ensures processing stability. The selection of emulsified water-based coolant not only provides efficient cooling effect, but also promotes the smooth discharge of chips and reduces friction and wear during processing.

[0051] like Figure 6 As shown, the online cylindricity detection includes selecting a laser cylindricity measuring instrument with an accuracy of 0.001mm, monitoring the cylindricity changes of the workpiece in real time, performing cylindricity detection once every 1 minute, and adjusting the processing parameters according to the detection results. The automated feedback control includes using a PLC-based automated feedback system to automatically adjust the feed speed or honing pressure when it is detected that the cylindricity exceeds a predetermined range. When it is detected that the cylindricity deviation is greater than 0.005mm, the system automatically adjusts the feed speed or honing pressure to a change range of ±0.05mm / min.

[0052] The real-time application of high-precision laser cylindricity measuring instruments ensures accurate monitoring and timely feedback of workpiece cylindricity, effectively preventing the accumulation of processing deviations. The introduction of the PLC automated feedback system enables intelligent adjustment of processing parameters, especially when cylindricity anomalies are detected. It can respond quickly and optimize the feed speed or honing pressure to ensure continuous and stable processing quality.

[0053] like Figure 7 As shown, the rough machining quality control includes the surface roughness requirement of the workpiece after rough machining Ra≤1.6μm, the dimensional tolerance is controlled within ±0.05mm, and aging treatment or low-temperature heat treatment is used to remove internal stress to ensure that the workpiece does not deform during subsequent honing processing.

[0054] By strengthening the quality control of rough machining, this method lays a solid foundation for the connecting rod honing process. The strict surface roughness and dimensional tolerance requirements ensure that the workpiece has good basic conditions before entering the honing stage, reducing the difficulty and error accumulation of subsequent processing. The implementation of aging treatment or low-temperature heat treatment effectively eliminates the internal stress of the workpiece, prevents machining deformation caused by stress release, and improves the dimensional stability and machining adaptability of the workpiece.

[0055] like Figure 8 As shown, the dynamic compensation device includes a dynamic compensation system that uses a high-precision linear displacement sensor combined with a servo motor system. During the honing process, the cylindricity change of the workpiece is monitored in real time, and compensation is performed based on the real-time data, with the control deviation range not exceeding 0.003mm.

[0056] Through the combination of high-precision linear displacement sensors and servo motor systems, real-time monitoring and precise compensation of workpiece cylindricity changes are achieved, effectively reducing the accumulation of deviations during the machining process. The control deviation range is strictly set within 0.003mm, ensuring the continued high precision of machining quality.

[0057] By comprehensively optimizing each link of the connecting rod honing process, the processing accuracy and efficiency have been significantly improved. In terms of processing parameters, the feed speed, rotation speed, cutting depth and honing pressure are finely controlled to ensure the smooth and efficient processing process and effectively reduce the processing errors caused by improper parameters. In terms of workpiece clamping and support, the use of special flexible fixtures and reasonably arranged support points greatly enhances the stability of the workpiece and avoids deformation problems during processing. At the same time, the selection of high-performance honing stones and optimized coolant systems further improves the grinding effect and thermal management capabilities, providing a strong guarantee for high-precision processing. The implementation of these comprehensive measures not only greatly improves the processing quality of the connecting rod, but also significantly enhances the controllability and stability of the production process.

[0058] By introducing advanced online monitoring and automated feedback control technology, strengthening the pre-processing of workpieces and adopting dynamic compensation devices, the intelligence and automation level of connecting rod honing processing has been further improved. The combination of online cylindricity detection and PLC automated feedback system has realized real-time monitoring and intelligent adjustment of processing quality, effectively preventing the accumulation of processing deviations and ensuring the continuous stability of processing accuracy. At the same time, through strict rough processing quality control and the application of dynamic compensation technology, the initial state differences of the workpieces and the deviations during the processing are further eliminated, and the cylindricity consistency of the connecting rod is improved.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for improving the cylindricity of a connecting rod during honing, characterized in that: The following steps are involved: S1: Optimize honing process parameters; S2: Improve the workpiece clamping method; S3: Improve honing tool selection; S4: Enhanced control of the coolant system; S5: Strengthen monitoring and real-time feedback during processing; S6: Strengthen the preliminary processing of workpieces; S7: Adopts dynamic compensation technology; The optimized honing processing parameters include feed speed and speed setting, cutting depth control, and honing pressure setting; the improved workpiece clamping method includes fixture selection and adding workpiece support points; the improved honing tool selection includes honing stone selection, honing stone shape and size; the enhanced coolant system control includes coolant flow setting, coolant temperature, and coolant selection; the enhanced monitoring and real-time feedback during the processing includes online cylindricity detection and automated feedback control; the enhanced workpiece pre-processing includes rough machining quality control; and the use of dynamic compensation technology includes a dynamic compensation device.

2. A method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The feed speed and rotation speed settings include setting the feed speed to 0.3 mm per minute, and reasonably adjusting the feed speed according to the material and specifications of the connecting rod to ensure the uniformity of the processing. The rotation speed is set to 500 revolutions per minute. The cutting depth control includes setting the initial cutting depth to 0.05 mm to avoid deformation of the workpiece caused by excessive cutting force. The subsequent cutting depth is reduced by 0.02 mm each time, and the cutting depth is gradually reduced to ensure a gradual improvement in the processing accuracy. The honing pressure is set to 0.5 MPa to ensure that the cutting force is evenly distributed to avoid deformation of the workpiece or poor surface quality caused by excessive or insufficient pressure.

3. A method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The fixture selection includes using a special flexible fixture to fix the connecting rod through three support points to ensure that it does not undergo any unnecessary deformation during the honing process. The fixture material is 20CrMnTi to ensure that the fixture does not deform under high pressure. The increase in workpiece support points includes using at least 4 support points to ensure stability based on the length and diameter of the connecting rod. The support point spacing is set to 1 / 4 of the workpiece length to avoid bending moment.

4. A method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The honing stone selection includes selecting a high-density ceramic honing stone with a particle size of 100-120 mesh to ensure high-precision grinding and a hardness of HRC60-65. The shape and size of the honing stone are cylindrical honing stones to ensure uniform grinding. The honing stone size is 40mm in diameter and 80mm in length.

5. The method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The coolant flow setting includes setting it to 10 liters per minute to ensure that sufficient coolant flows into the processing area during the processing to avoid overheating affecting the processing accuracy. The coolant temperature is maintained in the range of 18°C±2°C to avoid thermal deformation of the workpiece due to excessively high or low coolant temperature. The coolant type is an emulsified water-based coolant, which has good cooling performance and can effectively remove chips.

6. A method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The online cylindricity detection includes selecting a laser cylindricity measuring instrument with an accuracy of 0.001mm, monitoring the cylindricity changes of the workpiece in real time, performing cylindricity detection once every 1 minute, and adjusting the processing parameters according to the detection results. The automatic feedback control includes using a PLC-based automatic feedback system to automatically adjust the feed speed or honing pressure when the cylindricity is detected to be out of a predetermined range. When the cylindricity deviation is detected to be greater than 0.005mm, the system automatically adjusts the feed speed or honing pressure to a change range of ±0.05mm / min.

7. A method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The rough machining quality control includes the surface roughness requirement of the workpiece after rough machining Ra≤1.6μm, the dimensional tolerance is controlled within ±0.05mm, and aging treatment or low-temperature heat treatment is used to remove internal stress to ensure that the workpiece does not deform during subsequent honing processing.

8. The method for improving the cylindricity of a connecting rod during honing according to claim 1, characterized in that: The dynamic compensation device includes a dynamic compensation system that uses a high-precision linear displacement sensor combined with a servo motor system, and monitors the change in the cylindricity of the workpiece in real time during the honing process, and performs compensation based on the real-time data, with the control deviation range not exceeding 0.003mm.

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