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

{"title":"Glass-glass molding of concave-convex double-sided microlens arrays with high alignment accuracy","authors":"Zihao Zeng ,&nbsp;Tianfeng Zhou ,&nbsp;Zhikang Zhou ,&nbsp;Gang Wang ,&nbsp;Xiuwen Sun ,&nbsp;Qian Yu ,&nbsp;Jia Zhou ,&nbsp;Yubing Guo","doi":"10.1016/j.precisioneng.2025.02.014","DOIUrl":"10.1016/j.precisioneng.2025.02.014","url":null,"abstract":"<div><div>The utilization of a double-sided microlens array (DSMLA) eliminates optical energy loss, eliminates assembly errors, simplifies the optical system's structure, and enhances overall performance efficiency. Precision glass molding (PGM) has been applied to fabricate DSMLAs, and the accuracy of aligning the molded DSMLAs significantly impacts optical performance. This study delves into the thermal deformation mechanisms of glass to present a novel approach: utilizing a metal mold core for manufacturing a high transition temperature (<em>T</em>_g) glass microlens array (MLA). Subsequently, this high-<em>T</em>_g glass MLA is combined with the metal mold core, serving as upper and lower cores, to manufacture low-<em>T</em>_g glass concave-convex DSMLAs. The study scrutinizes the impact of optical energy loss rate and alignment errors in concave-convex DSMLAs on optical performance. Moreover, a method to control alignment errors in concave-convex DSMLAs is proposed to boost lens alignment accuracy. A finite element simulation model was established to evaluate the forming speed and stress distribution of the concave-convex DSMLAs. Experimental findings demonstrate that high-<em>T</em>_g glass as a mold core facilitates high-precision shape transfer, resulting in concave-convex DSMLAs with high alignment accuracy. Optical measurements reveal that the DSMLAs exhibit excellent beam shaping effects with spot uniformity at 97.23 %. The method provides a strategy for creating concave-convex DSMLAs with high alignment accuracy.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"94 ","pages":"Pages 80-90"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526652","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}

{"title":"Dynamic balancing of a flexure-based Watt’s linkage horological oscillator","authors":"H. Schneegans,&nbsp;F. Cosandier,&nbsp;S. Henein","doi":"10.1016/j.precisioneng.2025.02.009","DOIUrl":"10.1016/j.precisioneng.2025.02.009","url":null,"abstract":"<div><div>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 <span><math><mrow><mn>5</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>, 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.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 576-586"},"PeriodicalIF":3.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428773","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}

{"title":"A novel error compensation method for a redundant parallel mechanism based on adaptive differential evolution algorithm and RBF neural network","authors":"Chen-dong Zeng,&nbsp;Zhi-cheng Qiu,&nbsp;Fen-hua Zhang,&nbsp;Xian-min Zhang","doi":"10.1016/j.precisioneng.2025.02.013","DOIUrl":"10.1016/j.precisioneng.2025.02.013","url":null,"abstract":"<div><div>Accuracy plays an important role in the advanced industrial application of parallel mechanisms, and the related research is valuable. Taking a (6 + 3)-DOF kinematic redundant parallel mechanism (KRPM) as an example, a novel error compensation method is proposed. Firstly, the error model of the KRPM is established based on vector method. Secondly, adaptive differential evolution (ADE) algorithm and radial basis function neural network (RBFNN) are introduced, and they are combined as a novel error compensation method. Numerical simulation is carried out based on three cases, and compared with typical error compensation method, which verifies the effectiveness of the proposed method. Finally, the experiments are conducted based on laser tracker to verify the proposed method. Under the proposed method, the average effect of error prediction can reach 90.2 %, which is better than the typical error compensation method. After error compensation, the pose error of the KRPM is significantly reduced.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"94 ","pages":"Pages 26-42"},"PeriodicalIF":3.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487619","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}

{"title":"Microwave plasma modification-assisted shear-thickening polishing of single-crystal silicon carbide","authors":"Mengmeng Shen ,&nbsp;Min Wei ,&nbsp;Lingwei Wu ,&nbsp;Binbin Hong ,&nbsp;Jiahao Ye ,&nbsp;Hongyu Chen ,&nbsp;Julong Yuan ,&nbsp;Binghai Lyu ,&nbsp;Chuansheng Wang ,&nbsp;Hui Deng ,&nbsp;Wei Hang","doi":"10.1016/j.precisioneng.2025.02.010","DOIUrl":"10.1016/j.precisioneng.2025.02.010","url":null,"abstract":"<div><div>This study addressed existing limitations on the efficiency and efficacy of SiC processing by introducing an innovative microwave plasma modification-assisted shear-thickening polishing (MPM-STP) technology. First, the modification mechanism and effects of microwave plasma irradiation on the surface of a single-crystal SiC workpiece were explored. The formation of SiO₂ product by plasma modification was confirmed by X-ray photoelectron spectroscopy, and nanoindentation testing indicated an accompanying significant reduction in the hardness and elastic modulus of the SiC from 37.04 GPa to 4.71 GPa and from 504.57 GPa to 68.96 GPa, respectively, enhancing its processability. A systematic investigation of the changes in workpiece surface morphology under various microwave irradiation times, power levels, and distances revealed that a longer irradiation time and higher power level intensified the surface modification effect, and the irradiation distance had a crucial influence on the uniformity of the modified film, which could be optimized through precise adjustment of the irradiation parameters. Next, plasma-modified SiC workpieces were subjected to shear-thickening polishing using a CeO₂ abrasive, resulting in the complete removal of the modified film within 15 min and a substantial reduction in surface roughness <em>R</em>_a from 9.74 nm to 0.31 nm, indicating significantly improved surface quality. Finally, the results of nanoscratch experiments conducted on the surfaces of SiC workpieces before and after plasma modification indicated the transformation of the material removal mode from brittle fracture to plastic removal, which is crucial for improving processing efficiency and surface quality. The successful construction of a surface modification model for single-crystal SiC processed by MPM-STP in this study opens a new path for the high-precision machining of SiC materials.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"94 ","pages":"Pages 13-25"},"PeriodicalIF":3.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479218","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}

{"title":"Study on ultrasonic-assisted scratching and mirror grinding of silicon carbide based on truncated coarse diamond wheel","authors":"Yanjun Lu ,&nbsp;Xiaobu Liu ,&nbsp;Jiaxuan Du ,&nbsp;Xiaoshuang Rao","doi":"10.1016/j.precisioneng.2025.02.012","DOIUrl":"10.1016/j.precisioneng.2025.02.012","url":null,"abstract":"<div><div>Ultrasonic vibration-assisted grinding (UVAG) has been proven to be an effective method for processing hard and brittle materials such as silicon carbide (SiC). However, most UVAG processes use fine-grained diamond grinding wheels to achieve higher accuracy, which brings about the problems of heavy wear and frequent dressing, and lower material removal rates. Therefore, a new UVAG method based on coarse-grained diamond grinding wheel was proposed to realize mirror grinding of SiC. In this paper, the effects of ultrasonic power on the critical depth and grinding force were investigated during the brittle-ductile transition of SiC material removal. The effects of grinding process parameters and ultrasonic power on the ground surface quality were also analyzed and compared. The results show that the ductile removal region and the critical depth of brittle-ductile transition increase while the critical scratching force decreases when the ultrasonic power increase in a certain range. When the ultrasonic power is 40 % (ultrasonic amplitude of 2.36 μm), the longest ductile domain length, the largest critical brittle-ductile transition depth and the least critical scratching force of the scratched SiC surface reached 257.49 μm, 0.608 μm and 4.47 N, respectively. This indicates a significant positive impact of ultrasonic vibration on grinding of SiC. Compared with traditional mechanical grinding, coarse diamond grinding wheels assisted by ultrasonic vibration can achieve better surface quality, reducing the surface roughness of SiC by approximately 65.38 %. The surface roughness reaches the minimum value of 36 nm at the wheel speed of 12000 r/min, feed rate of 20 mm/min, grinding depth of 2 μm, and ultrasonic power of 40 %, resulting in a mirror-like macroscopic surface.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 587-603"},"PeriodicalIF":3.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474679","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}

{"title":"Design of a novel Z-shaped flexure hinge and a 2DOF XY precision positioning platform","authors":"Jinqiang Gan ,&nbsp;Wenlong Xie ,&nbsp;Wenjian Yang ,&nbsp;Shihe Lei ,&nbsp;Bo Lei","doi":"10.1016/j.precisioneng.2025.01.026","DOIUrl":"10.1016/j.precisioneng.2025.01.026","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"93 ","pages":"Pages 459-469"},"PeriodicalIF":3.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376732","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}

{"title":"Numerical and experimental study of material removal characteristics for magnetorheological micro-jet polishing","authors":"Dunlan Song ,&nbsp;Wenze Wang ,&nbsp;Jieqiong Lin ,&nbsp;Lingwei Qiu ,&nbsp;Hang Cui ,&nbsp;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}

{"title":"Investigation on the machining mechanism and surface integrity in ultrasonic elliptical vibration cutting of Al-Si alloys","authors":"Dachuan Chen ,&nbsp;Zhengding Zheng ,&nbsp;DongXu Wu ,&nbsp;Chong Zeng ,&nbsp;Yikai Zang ,&nbsp;Zhongdi She ,&nbsp;Jianguo Zhang ,&nbsp;Xiao Chen ,&nbsp;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}

{"title":"Time delay compensation in high-speed diamond turning of freeform surface using independent fast tool servo with a long stroke","authors":"Takeshi Hashimoto,&nbsp;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}

{"title":"Avoid the influence of error point cloud registration homogenization on the evaluation of blade machining allowance distribution","authors":"Xingzhao Wang ,&nbsp;Xu Zhang ,&nbsp;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}