Effect of speed parameters of reduction on the resulting pipe profile accuracy

2021 ◽  
pp. 35-39
Author(s):  
Yu. L. Bobarikin ◽  
Ya. I. Radkin ◽  
Yu. V. Martyanov ◽  
A. V. Strelchenko
Keyword(s):  
Profile Accuracy

scholarly journals Evaluation of Different Tools of Precision Finishing for Cold Extruded Sun Gear With Internal-External Tooth Shapes

2021 ◽  
Author(s):  
Zuofa Liu ◽  
Xi Wang ◽  
Wenjie Feng ◽  
Jie Zhou ◽  
Zhiyuan Qu ◽  
...  
Keyword(s):  
Finite Element ◽  
Metal Flow ◽  
Commercial Production ◽  
Cold Extrusion ◽  
Forming Load ◽  
Tool Stress ◽  
Distribution Laws ◽  
Profile Accuracy ◽  
Precision Finishing ◽  
Prediction Strategy

Abstract Due to the complex metal flow in the cold extrusion of sun gear, the teeth accuracy of formed sun gear is poor. In order to improve the accuracy of the extruded sun gear, a novel precision finishing method with different tools was proposed in this study. Finite element simulations were performed using DEFORM, and a new finite element (FE) prediction strategy was developed to obtain an in-depth understanding of the deviation distribution laws of the finished sun gear. Then, the influences of different finishing tools on tooth deformation, tool stress, forming load and tooth accuracy were examined. The investigation results show that the profile accuracy of external gear can be improved from ninth to seventh class, lead accuracy can be enhanced from tenth to eighth class, and total M value deviation of internal spline is reduced to 72.3 μm by the precision finishing method with interference mandrel. Therefore, the interference mandrel is recommended as the optimal reshaping tool for commercial production of sun gears. The simulation results are well agreed with the experimental results, which verifies the feasibility of the precision finishing method and the reliability of the FE prediction strategy.

Influence of the road profile accuracy on disturbance compensation in active suspension systems

2021 ◽  
Vol 69 (6) ◽  
pp. 485-498
Author(s):  
Felix Anhalt ◽  
Boris Lohmann
Keyword(s):  
Ride Comfort ◽  
Feedforward Control ◽  
Active Suspension ◽  
Disturbance Compensation ◽  
Critical Factors ◽  
The Road ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Road Profile ◽  
Profile Accuracy

Abstract By applying disturbance feedforward control in active suspension systems, knowledge of the road profile can be used to increase ride comfort and safety. As the assumed road profile will never match the real one perfectly, we examine the performance of different disturbance compensators under various deteriorations of the assumed road profile using both synthetic and measured profiles and two quarter vehicle models of different complexity. While a generally valid statement on the maximum tolerable deterioration cannot be made, we identify particularly critical factors and derive recommendations for practical use.

Analysis on profile accuracy for ultrasonic machining of alumina ceramics

2012 ◽  
Vol 67 (5-8) ◽  
pp. 1683-1691 ◽  
Author(s):  
H. Lalchhuanvela ◽  
B. Doloi ◽  
B. Bhattacharyya
Keyword(s):  
Ultrasonic Machining ◽  
Alumina Ceramics ◽  
Profile Accuracy

Analytical Study on Tooth Profile of Non-Circular Gear Based on Hobbing Process Simulation

2019 ◽  
Author(s):  
Jiang Han ◽  
Dazhu Li ◽  
Lian Xia ◽  
Xiaoqing Tian
Keyword(s):  
Process Simulation ◽  
Analytical Study ◽  
Profile Analysis ◽  
Tooth Profile ◽  
Feature Points ◽  
Analysis Method ◽  
High Convergence Rate ◽  
Envelope Method ◽  
Profile Accuracy ◽  
Uniform Accuracy

Abstract Based on the hobbing process simulation of non-circular gears, a method for obtaining the precise tooth profile and evaluating the undercutting characteristics according to the profile generated after the finite number of envelop is proposed. The profile points formed by different hobbing strategies are compared, then the envelope method with uniform accuracy for all teeth is selected. The formation rule of tooth profile morphology is analyzed, and the pickup method with high convergence rate is proposed. The influences of the envelope number and gear parameters on the tooth profile accuracy are analyzed inductively, and the reasonable number of envelopes for expected accuracy is given. The results show that the tooth profile analysis method based on the hobbing process simulation can accurately acquire all feature points of the tooth profile and analysis the undercutting phenomenon.

scholarly journals Design and Fabrication of Wafer-Level Microlens Array with Moth-Eye Antireflective Nanostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 747 ◽  
Author(s):  
Shuping Xie ◽  
Xinjun Wan ◽  
Bo Yang ◽  
Wei Zhang ◽  
Xiaoxiao Wei ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Production Efficiency ◽  
Low Cost ◽  
Microlens Array ◽  
Wafer Level ◽  
Lens Array ◽  
Wafer Level Packaging ◽  
High Production ◽  
Aspherical Lenses ◽  
Profile Accuracy

Wafer-level packaging (WLP) based camera module production has attracted widespread industrial interest because it offers high production efficiency and compact modules. However, suppressing the surface Fresnel reflection losses is challenging for wafer-level microlens arrays. Traditional dielectric antireflection (AR) coatings can cause wafer warpage and coating fractures during wafer lens coating and reflow. In this paper, we present the fabrication of a multiscale functional structure-based wafer-level lens array incorporating moth-eye nanostructures for AR effects, hundred-micrometer-level aspherical lenses for camera imaging, and a wafer-level substrate for wafer assembly. The proposed fabrication process includes manufacturing a wafer lens array metal mold using ultraprecise machining, chemically generating a nanopore array layer, and replicating the multiscale wafer lens array using ultraviolet nanoimprint lithography. A 50-mm-diameter wafer lens array is fabricated containing 437 accurate aspherical microlenses with diameters of 1.0 mm; each lens surface possesses nanostructures with an average period of ~120 nm. The microlens quality is sufficient for imaging in terms of profile accuracy and roughness. Compared to lenses without AR nanostructures, the transmittance of the fabricated multiscale lens is increased by ~3% under wavelengths of 400–750 nm. This research provides a foundation for the high-throughput and low-cost industrial application of wafer-level arrays with AR nanostructures.

Development of New Device for Form-Grinding and Research on the Profile-Accuracy

2005 ◽  
Vol 291-292 ◽  
pp. 3-8
Author(s):  
Qiu Sheng Yan ◽  
Ling Ye Kong ◽  
N.Q. Wu ◽  
Shao Bo Chen ◽  
Zi Qiang Zhang ◽  
...  
Keyword(s):  
Error Compensation ◽  
Grinding Process ◽  
Cross Sectional ◽  
Abrasive Wheel ◽  
New Device ◽  
Form Grinding ◽  
Key Points ◽  
Grinding Machine ◽  
External Cylindrical Grinding ◽  
Profile Accuracy

The profile accuracy of the workpiece is mainly determined by the accuracy of abrasive wheel in the form-grinding process. Thus, the shaped wheel dressing becomes one of the key points in the form-grinding process. In order to grind the revolving curved surfaces grooves whose cross-sectional profiles are steep and smooth, a new NC dresser with three NC axes is developed by adding a swing axis on the basis of NC external cylindrical grinding machine. A wheel of any desired convex profile can be dressed when using the Diaform single-diamond dresser and the possible geometrical interference between the single-diamond dresser and wheel can be eliminated. By analyzing the influence of installation accuracy on the profile accuracy, a method of comprehensive error compensation is presented. The comprehensive errors can be diminished greatly to improve the profile accuracy by means of error compensation. It is proved in the experiments that the precision requirements of grinding the formed surfaces grooves can be met.

A Fundamental Investigation on Ultrasonic Assisted Fixed Abrasive CMP (UF-CMP) of Silicon Wafer

2014 ◽  
Vol 983 ◽  
pp. 208-213 ◽  
Author(s):  
Yong Bo Wu ◽  
Li Jun Wang
Keyword(s):  
Surface Quality ◽  
Silicon Wafer ◽  
Removal Rate ◽  
High Profile ◽  
Work Surface ◽  
Ultrasonic Assisted ◽  
Polishing Efficiency ◽  
Profile Accuracy ◽  
Abrasive Process ◽  
Fixed Abrasive

Chemical mechanical polishing (CMP) is often employed to obtain a super smooth work-surface of a silicon wafer. However, as a conventional CMP is a loose abrasive process, it is hard to achieve the high profile accuracy and lots of slurry must be supplied during CMP operations. As an alternate solution, a fixed abrasive CMP process can offer better geometrical accuracy and discharges less waste disposal. In this paper, in order to enhance the polishing efficiency and improve the work-surface quality, a novel ultrasonic assisted fixed abrasive CMP (UF-CMP) is proposed and the fundamental machining characteristics of the UF-CMP of a silicon wafer is investigated experimentally. The results show that with the ultrasonic assistance, the material removal rate (MRR) is increased, and the surface quality is improved.

Research on Path of Contact Wheel for Ruled Blade Grinding

2014 ◽  
Vol 536-537 ◽  
pp. 1343-1346
Author(s):  
Da Qi Li ◽  
Lei Zhang ◽  
Wei Dong Ye ◽  
Hai Ying Zu
Keyword(s):  
Belt Grinding ◽  
High Profile ◽  
Wind Generators ◽  
Aero Engine ◽  
Wrap Angle ◽  
Two Sides ◽  
Profile Accuracy ◽  
Grinding System ◽  
Selection Of

Blade is one of the important components in aero-engine, turbine, and wind generators. The quality of the blades has big influence on the performance of the machine. So high profile accuracy and low surface roughness were put forward. Ruled blade is just one of the blades of aero-engine, which has simple profile and little distort. This blade was grinded by two sides together in the paper. Therefore, in this thesis, the main objects are as fallow: firstly, according to the characteristics of the abrasive belt grinding, analysis the selection of grinding distance for the blade. Secondly, established the model of contact wheel compare grinding system, derived the range of wrap angle of contact wheel, and then two region were make out, one is the region can be directly grinding, and another region which may lead to wheel interference. At last the grinding path of the center of the contact wheel was obtained by calculated the blade model.

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