Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology最新文献

英文中文

Dynamic balancing of a flexure-based Watt’s linkage horological oscillator

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-17 DOI: 10.1016/j.precisioneng.2025.02.009

H. Schneegans, F. Cosandier, S. Henein

Mechanical watches are generally regulated by a balance and a spring constituting a harmonic oscillator. This mechanism is intrinsically force-balanced, which makes it essentially insensitive to gravity as well as to the linear accelerations of the watch. Nevertheless, this mechanism is not dynamically balanced, i.e., its motion is affected by the angular accelerations of the watch around axes parallel to the pivoting axis of the balance. This phenomenon degrades the chronometric precision of the watch when worn on the wrist. This article presents a novel dynamically-balanced oscillator mechanism dedicated to mechanical watches, which solves this issue: a 1-DOF mechanism relying on a flexure-based Watt’s linkage equipped with two balances rotating in opposite directions. The use of flexures brings additional advantages: absence of friction, no need for lubrication, increased quality factor, and monolithic design. The mechanism is presented with its Pseudo-Rigid-Body-Model and the numerical model used to predict force and dynamic-balancing residual defects: this includes sag and frequency variations under in-plane gravitational loads and pose sensitivity to in-plane angular accelerations. Experimental results from a 2:1 scale titanium prototype, compared to a watch-scale prototype, validated both the analytical and numerical models for large force and dynamic-balancing defects. An iterative tuning method achieved a sag variation below

5 μ m

, a daily rate variation of less than 18 seconds per day for all in-plane gravity orientations, and sensitivity to angular accelerations 250 times lower than its single-balance version.

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引用次数: 0

Design of a novel Z-shaped flexure hinge and a 2DOF XY precision positioning platform

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-07 DOI: 10.1016/j.precisioneng.2025.01.026

Jinqiang Gan , Wenlong Xie , Wenjian Yang , Shihe Lei , Bo Lei

To solve the problem of inadequate amplification ratio within the precision positioning platforms, a novel Z-shaped flexure hinge (ZFH) is proposed firstly in this paper. Meanwhile, a 2DOF XY precision positioning platform which realizes secondary amplification with bridge-shaped mechanisms and novel ZFHs is designed. The novel ZFH and the platform are analyzed by static modeling with compliance matrix method and the principle of force equilibrium. The simulation results show that the errors in both stiffness and amplification ratios of the platform are within 7%, and the performance of novel ZFH is improved by 50.70%. Finally, A prototype of the platform is fabricated for performance testing. The experimental results well validate the superior performance of the platform and novel ZFH.

引用次数: 0

Numerical and experimental study of material removal characteristics for magnetorheological micro-jet polishing

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-07 DOI: 10.1016/j.precisioneng.2025.02.008

Dunlan Song , Wenze Wang , Jieqiong Lin , Lingwei Qiu , Hang Cui , Xiaoqin Zhou

Magnetorheological micro jet polishing (MMJP) technology has great potential for polishing components with complex surfaces, cavities, and microstructures. However, there is a lack of in-depth and systematic research on the material removal characteristics of MMJP under different processing parameters, which hinders its engineering application. This study developed a numerical model for MMJP using the Volume of Fluid (VOF) multiphase flow model and the K-W turbulence model, which was used to analyze the interaction between the flow field and the workpiece during the polishing process. To clarify the material removal process, the material removal mechanism of MMJP was investigated. The forces acting on individual abrasives in the flow field were analyzed, and a material removal model for MMJP was established based on the Preston equation. Additionally, a combined approach of simulation and experimentation was used to study the effects of different processing parameters on material removal and polishing performance. The experimental results were consistent with the numerical predictions, demonstrating the reliability of the CFD model. Finally, an orthogonal optimization experiment was designed to determine the influence hierarchy of various process factors on the polishing results. Using the optimal process parameter combination, aluminum alloy workpieces were polished, with the surface roughness reduced from 355 nm to 253 nm. This study provides theoretical support and processing guidance for the industrial application of MMJP.

{"title":"Numerical and experimental study of material removal characteristics for magnetorheological micro-jet polishing","authors":"Dunlan Song , Wenze Wang , Jieqiong Lin , Lingwei Qiu , Hang Cui , Xiaoqin Zhou","doi":"10.1016/j.precisioneng.2025.02.008","DOIUrl":"10.1016/j.precisioneng.2025.02.008","url":null,"abstract":"<div><div>Magnetorheological micro jet polishing (MMJP) technology has great potential for polishing components with complex surfaces, cavities, and microstructures. However, there is a lack of in-depth and systematic research on the material removal characteristics of MMJP under different processing parameters, which hinders its engineering application. This study developed a numerical model for MMJP using the Volume of Fluid (VOF) multiphase flow model and the K-W turbulence model, which was used to analyze the interaction between the flow field and the workpiece during the polishing process. To clarify the material removal process, the material removal mechanism of MMJP was investigated. The forces acting on individual abrasives in the flow field were analyzed, and a material removal model for MMJP was established based on the Preston equation. Additionally, a combined approach of simulation and experimentation was used to study the effects of different processing parameters on material removal and polishing performance. The experimental results were consistent with the numerical predictions, demonstrating the reliability of the CFD model. Finally, an orthogonal optimization experiment was designed to determine the influence hierarchy of various process factors on the polishing results. Using the optimal process parameter combination, aluminum alloy workpieces were polished, with the surface roughness reduced from 355 nm to 253 nm. This study provides theoretical support and processing guidance for the industrial application of MMJP.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 497-514"},"PeriodicalIF":3.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the machining mechanism and surface integrity in ultrasonic elliptical vibration cutting of Al-Si alloys

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-07 DOI: 10.1016/j.precisioneng.2025.02.007

Dachuan Chen , Zhengding Zheng , DongXu Wu , Chong Zeng , Yikai Zang , Zhongdi She , Jianguo Zhang , Xiao Chen , Jianfeng Xu

The incorporation of reinforcing particles makes the high-quality machining of particle-reinforced metal matrix composites, exemplified by Al-Si alloys, extremely difficult. Ultrasonic elliptical vibration cutting (UEVC) has been proven potentially advantageous in Al-Si alloys machining. Within this article, by combining finite element (FE) and experimental analysis, the machining mechanism and surface integrity of Al-Si alloys under traditional cutting (TC) and UEVC are discussed. The influence of the relative position of particle and cutting path on the coordinated deformation behavior of particle and matrix was investigated. Then, further analysis was conducted on the cutting force, chip formation, surface residual stress, and tool wear mechanism. Finally, the influence of different process parameters on surface integrity was studied in detail. The results indicated that the intermittent disengagement of the tool from the workpiece in UEVC avoids continuous tool-workpiece compression. Additionally, the elliptical trajectory induces friction reversal and facilitates chip removal, suppressing the damage formation. With the characteristics above, UEVC can significantly enhance surface integrity and suppress tool wear. It can also increase surface residual compressive stress and reduce both the mean cutting force and surface roughness. Current findings provide novel insights and practical guidance for high-quality machining of Al-Si alloys by UEVC.

{"title":"Investigation on the machining mechanism and surface integrity in ultrasonic elliptical vibration cutting of Al-Si alloys","authors":"Dachuan Chen , Zhengding Zheng , DongXu Wu , Chong Zeng , Yikai Zang , Zhongdi She , Jianguo Zhang , Xiao Chen , Jianfeng Xu","doi":"10.1016/j.precisioneng.2025.02.007","DOIUrl":"10.1016/j.precisioneng.2025.02.007","url":null,"abstract":"<div><div>The incorporation of reinforcing particles makes the high-quality machining of particle-reinforced metal matrix composites, exemplified by Al-Si alloys, extremely difficult. Ultrasonic elliptical vibration cutting (UEVC) has been proven potentially advantageous in Al-Si alloys machining. Within this article, by combining finite element (FE) and experimental analysis, the machining mechanism and surface integrity of Al-Si alloys under traditional cutting (TC) and UEVC are discussed. The influence of the relative position of particle and cutting path on the coordinated deformation behavior of particle and matrix was investigated. Then, further analysis was conducted on the cutting force, chip formation, surface residual stress, and tool wear mechanism. Finally, the influence of different process parameters on surface integrity was studied in detail. The results indicated that the intermittent disengagement of the tool from the workpiece in UEVC avoids continuous tool-workpiece compression. Additionally, the elliptical trajectory induces friction reversal and facilitates chip removal, suppressing the damage formation. With the characteristics above, UEVC can significantly enhance surface integrity and suppress tool wear. It can also increase surface residual compressive stress and reduce both the mean cutting force and surface roughness. Current findings provide novel insights and practical guidance for high-quality machining of Al-Si alloys by UEVC.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 559-575"},"PeriodicalIF":3.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time delay compensation in high-speed diamond turning of freeform surface using independent fast tool servo with a long stroke

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-06 DOI: 10.1016/j.precisioneng.2025.02.006

Takeshi Hashimoto, Jiwang Yan

The demand for wearable device applications has continuously grown in recent years, especially with the significant rise of augmented and virtual reality technologies. Freeform optics plays a crucial role in these devices by enhancing optical performance, shortening the light path, and reducing the weight, all while allowing for smaller, lighter systems with higher efficiency. The independent fast tool servo (FTS)-based diamond-turning method stands out as a highly effective technique for fabricating freeform shapes with high accuracy and productivity. However, microsecond-order time delays occur within the system, significantly impacting form accuracy as machining speeds increase. This study explores the sources of form errors in freeform surface fabrication associated with the FTS diamond-turning process, with particular attention to the effects of clocking angle errors caused by the time delay. These errors were found to greatly affect form accuracy, especially at higher machining speeds. The FTS position data were analyzed, and time delays under various operational conditions due to servo control were confirmed. To precisely identify the extent of the time delay, a cylindrical surface was machined under high-speed conditions, and the clocking angle error was measured using a non-contact chromatic probe. Results showed that time delays originating from the machine platform had a significant effect on form accuracy. By accurately identifying and compensating for these time delays, the clocking angle error was eliminated. To validate the effectiveness of the time-delay compensation strategy, a cylindrical freeform surface was machined after the compensation, and the clocking angle error was minimized down to 0.00014° evaluated by on-machine measurement. The form accuracy of the freeform machining result after compensation was achieved at 0.85 μm PV. This study establishes a methodology for identifying and compensating for time delays in an independent FTS system, contributing to improved form accuracy in freeform optics fabrication.

{"title":"Time delay compensation in high-speed diamond turning of freeform surface using independent fast tool servo with a long stroke","authors":"Takeshi Hashimoto, Jiwang Yan","doi":"10.1016/j.precisioneng.2025.02.006","DOIUrl":"10.1016/j.precisioneng.2025.02.006","url":null,"abstract":"<div><div>The demand for wearable device applications has continuously grown in recent years, especially with the significant rise of augmented and virtual reality technologies. Freeform optics plays a crucial role in these devices by enhancing optical performance, shortening the light path, and reducing the weight, all while allowing for smaller, lighter systems with higher efficiency. The independent fast tool servo (FTS)-based diamond-turning method stands out as a highly effective technique for fabricating freeform shapes with high accuracy and productivity. However, microsecond-order time delays occur within the system, significantly impacting form accuracy as machining speeds increase. This study explores the sources of form errors in freeform surface fabrication associated with the FTS diamond-turning process, with particular attention to the effects of clocking angle errors caused by the time delay. These errors were found to greatly affect form accuracy, especially at higher machining speeds. The FTS position data were analyzed, and time delays under various operational conditions due to servo control were confirmed. To precisely identify the extent of the time delay, a cylindrical surface was machined under high-speed conditions, and the clocking angle error was measured using a non-contact chromatic probe. Results showed that time delays originating from the machine platform had a significant effect on form accuracy. By accurately identifying and compensating for these time delays, the clocking angle error was eliminated. To validate the effectiveness of the time-delay compensation strategy, a cylindrical freeform surface was machined after the compensation, and the clocking angle error was minimized down to 0.00014° evaluated by on-machine measurement. The form accuracy of the freeform machining result after compensation was achieved at 0.85 μm PV. This study establishes a methodology for identifying and compensating for time delays in an independent FTS system, contributing to improved form accuracy in freeform optics fabrication.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 515-527"},"PeriodicalIF":3.5,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Avoid the influence of error point cloud registration homogenization on the evaluation of blade machining allowance distribution

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-06 DOI: 10.1016/j.precisioneng.2025.01.024

Xingzhao Wang , Xu Zhang , Limin Zhu

The homogenization or abandonment of local machining error point cloud in machining allowance evaluation will bring negative effects. Therefore, a regional unilateral control point cloud registration algorithm based on directed distance function is proposed. The rapid extraction and classification of errors are realized by hierarchical identification with the change rate of distance value as the parameter. According to the error type, the error region is expanded to achieve in the solution: the non-error region is the minimum iterative value selection interval and the fixed maximum error region is the maximum iterative value selection interval. The simulation results show that the distribution of machining allowance in the non-error region obtained by the proposed method is close to the ideal value. The blade measurement test shows that compared with the standard method and the removal point method, the new method can ensure the distribution of blade machining allowance is more reasonable.

{"title":"Avoid the influence of error point cloud registration homogenization on the evaluation of blade machining allowance distribution","authors":"Xingzhao Wang , Xu Zhang , Limin Zhu","doi":"10.1016/j.precisioneng.2025.01.024","DOIUrl":"10.1016/j.precisioneng.2025.01.024","url":null,"abstract":"<div><div>The homogenization or abandonment of local machining error point cloud in machining allowance evaluation will bring negative effects. Therefore, a regional unilateral control point cloud registration algorithm based on directed distance function is proposed. The rapid extraction and classification of errors are realized by hierarchical identification with the change rate of distance value as the parameter. According to the error type, the error region is expanded to achieve in the solution: the non-error region is the minimum iterative value selection interval and the fixed maximum error region is the maximum iterative value selection interval. The simulation results show that the distribution of machining allowance in the non-error region obtained by the proposed method is close to the ideal value. The blade measurement test shows that compared with the standard method and the removal point method, the new method can ensure the distribution of blade machining allowance is more reasonable.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 470-480"},"PeriodicalIF":3.5,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combining laser texturing and remelting for reducing friction and corrosive wear in Ti-based amorphous alloys

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-04 DOI: 10.1016/j.precisioneng.2025.02.001

Kunpeng Guan, Jing Yu, Fengtao Wang, Xiulin Ji

Ti-based amorphous alloys are known for their high strength, hardness, and excellent corrosion resistance, but generally limited tribological performance. To reduce the coefficient of friction (COF) and mitigate corrosive wear, laser surface texturing and remelting were applied. Three distinct groove textures were fabricated: an asymmetric double-depth groove (AG), a remelting-formed dense low-depth groove (DLDG), and a combination of both textures (DLDG + AG). The tribocorrosion behavior were evaluated using reciprocating sliding tests against a Si₃N₄ ball in a 3.5 % NaCl solution. The AG sample demonstrated a 21.5 % reduction in COF and a 27.4 % reduction in wear rate. Due to remelting-induced oxidation and partial crystallization, the DLDG sample increased the COF but significantly enhanced wear resistance, improving it by approximately 40.6 times. Furthermore, the DLDG + AG sample effectively combined the advantages of laser texturing and remelting, reducing the COF by 26.9 % and enhancing wear resistance by 15.5 times. Regarding the corrosion without sliding, the DLDG sample exhibited the best corrosion resistance, while the AG sample showed deteriorated corrosion resistance. However, the DLDG + AG sample demonstrated the best corrosion resistance under sliding conditions with about 96.6 % reduction in corrosion current density. In conclusion, the combination of laser surface texturing and remelting offers a promising strategy to improve the tribocorrosion performance of Ti-based amorphous alloys by simultaneously reducing COF, enhancing wear resistance, and improving corrosion resistance.

{"title":"Combining laser texturing and remelting for reducing friction and corrosive wear in Ti-based amorphous alloys","authors":"Kunpeng Guan, Jing Yu, Fengtao Wang, Xiulin Ji","doi":"10.1016/j.precisioneng.2025.02.001","DOIUrl":"10.1016/j.precisioneng.2025.02.001","url":null,"abstract":"<div><div>Ti-based amorphous alloys are known for their high strength, hardness, and excellent corrosion resistance, but generally limited tribological performance. To reduce the coefficient of friction (COF) and mitigate corrosive wear, laser surface texturing and remelting were applied. Three distinct groove textures were fabricated: an asymmetric double-depth groove (AG), a remelting-formed dense low-depth groove (DLDG), and a combination of both textures (DLDG + AG). The tribocorrosion behavior were evaluated using reciprocating sliding tests against a Si<sub>3</sub>N<sub>4</sub> ball in a 3.5 % NaCl solution. The AG sample demonstrated a 21.5 % reduction in COF and a 27.4 % reduction in wear rate. Due to remelting-induced oxidation and partial crystallization, the DLDG sample increased the COF but significantly enhanced wear resistance, improving it by approximately 40.6 times. Furthermore, the DLDG + AG sample effectively combined the advantages of laser texturing and remelting, reducing the COF by 26.9 % and enhancing wear resistance by 15.5 times. Regarding the corrosion without sliding, the DLDG sample exhibited the best corrosion resistance, while the AG sample showed deteriorated corrosion resistance. However, the DLDG + AG sample demonstrated the best corrosion resistance under sliding conditions with about 96.6 % reduction in corrosion current density. In conclusion, the combination of laser surface texturing and remelting offers a promising strategy to improve the tribocorrosion performance of Ti-based amorphous alloys by simultaneously reducing COF, enhancing wear resistance, and improving corrosion resistance.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 417-424"},"PeriodicalIF":3.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Piecewise system identification and trajectory acceleration reallocating for diamond turning of microlens arrays

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-04 DOI: 10.1016/j.precisioneng.2025.02.005

Zhiyue Wang , Zhenhua Jiang , Hao Wu , Yangqin Yu , Limin Zhu , Xinquan Zhang

The use of microlens arrays (MLAs) manufactured through slow tool servo (STS) machining is becoming increasingly common in the field of complex surface optics. However, the current STS technique presents a significant challenge in balancing machining efficiency and surface profile accuracy, mainly due to the rapid variations in the spatial frequency of the microlenses. To address this challenge, this study proposes a piecewise system identification method along with trajectory acceleration reallocating. Specifically, the proposed method models the machine lathe Z-axis as a dynamic system piecewise, segmented by different trajectory acceleration intervals, to accurately approximate the nonlinear dynamic response of Z-axis. Tracking error prediction and trajectory acceleration reallocating are developed based on the piecewise system identification. To validate the proposed approach, diamond turning experiments were conducted on an ultraprecision machine lathe. The proposed approach significantly enhances the surface form accuracy while marginally improving the machining efficiency.

{"title":"Piecewise system identification and trajectory acceleration reallocating for diamond turning of microlens arrays","authors":"Zhiyue Wang , Zhenhua Jiang , Hao Wu , Yangqin Yu , Limin Zhu , Xinquan Zhang","doi":"10.1016/j.precisioneng.2025.02.005","DOIUrl":"10.1016/j.precisioneng.2025.02.005","url":null,"abstract":"<div><div>The use of microlens arrays (MLAs) manufactured through slow tool servo (STS) machining is becoming increasingly common in the field of complex surface optics. However, the current STS technique presents a significant challenge in balancing machining efficiency and surface profile accuracy, mainly due to the rapid variations in the spatial frequency of the microlenses. To address this challenge, this study proposes a piecewise system identification method along with trajectory acceleration reallocating. Specifically, the proposed method models the machine lathe Z-axis as a dynamic system piecewise, segmented by different trajectory acceleration intervals, to accurately approximate the nonlinear dynamic response of Z-axis. Tracking error prediction and trajectory acceleration reallocating are developed based on the piecewise system identification. To validate the proposed approach, diamond turning experiments were conducted on an ultraprecision machine lathe. The proposed approach significantly enhances the surface form accuracy while marginally improving the machining efficiency.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 425-436"},"PeriodicalIF":3.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A selection method of key temperature points for thermal error modeling of machine tools featuring multiple heat sources

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-03 DOI: 10.1016/j.precisioneng.2025.01.021

Lei Cao , Gyungho Khim , Seung Guk Baek , Sung-Chong Chung , Chun-Hong Park

A method that integrates grey relational and thermal sensitivity analyses, and fuzzy c-means clustering, called GTF method, is proposed to select key temperature points for thermal error modeling of machine tools featuring multiple heat sources. A two-dimensional temperature-error index is employed to prevent candidate temperature points with high correlations from being excluded when selecting the temperature points to improve thermal error compensation. To verify the method effectiveness and versatility, prediction accuracies were estimated for a vertical machining center and a floor-type boring machine with multiple heat sources. The root mean square error average reduction rates of the GTF method were approximately 28.0 % and 25.8 % in comparison with the conventional method for the two machine tools, respectively. From the results, it was confirmed that the proposed GTF method ensures accurate thermal predictions for machine tools with multiple heat sources, and is versatile.

{"title":"A selection method of key temperature points for thermal error modeling of machine tools featuring multiple heat sources","authors":"Lei Cao , Gyungho Khim , Seung Guk Baek , Sung-Chong Chung , Chun-Hong Park","doi":"10.1016/j.precisioneng.2025.01.021","DOIUrl":"10.1016/j.precisioneng.2025.01.021","url":null,"abstract":"<div><div>A method that integrates grey relational and thermal sensitivity analyses, and fuzzy c-means clustering, called GTF method, is proposed to select key temperature points for thermal error modeling of machine tools featuring multiple heat sources. A two-dimensional temperature-error index is employed to prevent candidate temperature points with high correlations from being excluded when selecting the temperature points to improve thermal error compensation. To verify the method effectiveness and versatility, prediction accuracies were estimated for a vertical machining center and a floor-type boring machine with multiple heat sources. The root mean square error average reduction rates of the GTF method were approximately 28.0 % and 25.8 % in comparison with the conventional method for the two machine tools, respectively. From the results, it was confirmed that the proposed GTF method ensures accurate thermal predictions for machine tools with multiple heat sources, and is versatile.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 528-539"},"PeriodicalIF":3.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a novel self-locking-at-rest piezoelectric inchworm motor with high switching frequency driving ability

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology

Pub Date : 2025-02-03 DOI: 10.1016/j.precisioneng.2025.01.027

Sandip Jana , Sofiane Ghenna , Saikat Kumar Shome , Yves Bernard , Arup Kumar Nandi , Laurent Daniel

In this paper, a novel piezoelectric actuator-based inchworm motor and its driving mechanism has been proposed for high speed linear application. Three high voltage positive square pulses with appropriate phase sequence amongst them have been applied to the two clamps and one extender of IM to achieve the desired linear translation. Isolated mosfet-based switching and oscillation circuits have been designed to operate the motor at high switching frequencies by dynamically reducing the capacitive reactance of the piezoelectric stack actuators. Consequently, experiments on the characterization of the piezo-actuators have been performed to identify the pre stress on the motor rail. Geometric model of the system has been developed using finite element analysis to determine displacement distribution in Clamping Mechanism and Extending Mechanism before physically fabricating the motor prototype to verify the driving mechanism. Performance evaluation has been carried out under varying duty cycles, switching frequencies and loads. The motor is observed to achieve a maximum no load speed of 60 mm/s under the 80–90 V positive square pulse at a frequency of 3 kHz with a 20 % duty cycle. A relatively high electrical driver efficiency of 42 % is experimentally achieved which makes the proposed mechatronic system highly suitable for low-size, high torque industrial applications.

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