scholarly journals Research on multi-sensor measurement system and evaluation method for roundness and straightness errors of deep-hole parts

2021 ◽  
Author(s):  
Ci Song ◽  
Xibin Wang ◽  
zhibing Liu ◽  
Hui Chen
Keyword(s):  
Evaluation Method ◽  
Solution Process ◽  
Displacement Sensor ◽  
Shape Error ◽  
Deep Hole ◽  
Error Evaluation ◽  
Angle Sensor ◽  
Measuring Device ◽  
Machining Quality ◽  
Shape Errors

Abstract Precision deep-hole parts are widely used in various fields of industrial production and their machining quality has a great impact on fatigue limit, geometric accuracy, and stability of products. Since roundness and straightness errors are essential technical indexes to evaluate the machining quality of deep-hole parts, accurate measurement and effective evaluation of them are of great significance to ensure the performance of related products. A multi-sensor integrated device that can measure two kinds of shape errors simultaneously was developed based on laser displacement sensor, two-dimensional position-sensitive detector, angle sensor, and laser distance sensor. Aiming at the problem of roundness error evaluation, the solution process of the control points of the minimum zone circle was optimized by calculating the distance between points and searching according to the polygon removal rule. Besides, the rotating projection method was used to evaluate the straightness error effectively. Eventually, the effectiveness of the measuring device and the shape error evaluation method was verified by experimental research.

The shape error evaluation methods of the foils for a multi-leaf foil bearing

2018 ◽  
Vol 233 (2) ◽  
pp. 504-513 ◽  
Author(s):  
Yuan Yu ◽  
Cheng Ren ◽  
Yanhua Sun
Keyword(s):  
Evaluation Method ◽  
Least Square ◽  
Shape Error ◽  
Pressing Pressure ◽  
Error Evaluation ◽  
Profile Error ◽  
Roundness Error ◽  
Manufacturing Method ◽  
Foil Bearing ◽  
Curve Profile

The geometric parameters of the elastic foil bearing are important basis for designing the foil bearing. Whether the main shape indices of the pressed foils meet the design requirements is the key to evaluate a manufacturing method. The inconsistent curvature radii of the top foils, the inconsistent bump heights of the bumps on the bump foil, the roundness error of the top foil, and the curve profile error of the bump foil may cause the pre-tightening assembly difference and different bearing capacity of each bearing shell. Aiming at the shape error evaluations of the foils for a multi-leaf foil bearing, first, the algorithm of geometric area optimization for circle roundness error is introduced and an evaluation method of arc roundness error is put forward according to the minimum zone principle in this paper. This method can be used to calculate the roundness error of the top foil for a multi-leaf foil bearing. The results show that the corresponding roundness error of the top foil decreases with the increasing of the pressing pressure. The relative roundness error is small (less than 7%), which changes a little with different pressing pressures. For the measurement of a bottom bump foil, the method of matching feature points is used in pre-location and then fine-positioning for the measured curve is implemented based on the least square method in order to eliminate the position error between the measured curve and the design curve. Thus, the curve profile error evaluation of the bottom bump foil for a multi-leaf foil bearing is implemented and the profile error of each bump can be obtained. According to the shape error evaluation values of the top foil and the bump foil, the quality control strategy and the error compensation by improving the mold structure can be further researched.

Shape error evaluation method of free-form surfaces

1999 ◽  
Vol 31 (8) ◽  
pp. 495-505 ◽  
Author(s):  
K. Kase ◽  
A. Makinouchi ◽  
T. Nakagawa ◽  
H. Suzuki ◽  
F. Kimura
Keyword(s):  
Evaluation Method ◽  
Free Form ◽  
Shape Error ◽  
Error Evaluation ◽  
Free Form Surfaces

The minimum zone fitting and error evaluation for the logarithmic curve based on geometry optimization approximation algorithm

2019 ◽  
Vol 41 (15) ◽  
pp. 4380-4386
Author(s):  
Tu Xianping ◽  
Lei Xianqing ◽  
Ma Wensuo ◽  
Wang Xiaoyi ◽  
Hu Luqing ◽  
...  
Keyword(s):  
Approximation Algorithm ◽  
Evaluation Method ◽  
Geometry Optimization ◽  
Reference Points ◽  
Approximation Technique ◽  
Error Evaluation ◽  
Iterative Approximation ◽  
Logarithmic Curve ◽  
Normal Distance ◽  
Minimum Zone

The minimum zone fitting and error evaluation for the logarithmic curve has important applications. Based on geometry optimization approximation algorithm whilst considering geometric characteristics of logarithmic curves, a new fitting and error evaluation method for the logarithmic curve is presented. To this end, two feature points, to serve as reference, are chosen either from those located on the least squares logarithmic curve or from amongst measurement points. Four auxiliary points surrounding each of the two reference points are then arranged to resemble vertices of a square. Subsequently, based on these auxiliary points, a series of auxiliary logarithmic curves (16 curves) are constructed, and the normal distance and corresponding range of values between each measurement point and all auxiliary logarithmic curves are calculated. Finally, by means of an iterative approximation technique consisting of comparing, evaluating, and changing reference points; determining new auxiliary points; and constructing corresponding auxiliary logarithmic curves, minimum zone fitting and evaluation of logarithmic curve profile errors are implemented. The example results show that the logarithmic curve can be fitted, and its profile error can be evaluated effectively and precisely using the presented method.

Research on Deep-hole Drilling Quality of High-strength Steel With Slender Gun Drill

2021 ◽  
Author(s):  
Jiabin Liang ◽  
Li Jiao ◽  
Pei Yan ◽  
Minghui Cheng ◽  
Tianyang Qiu ◽  
...  
Keyword(s):  
Cutting Force ◽  
High Strength Steel ◽  
Fluid Pressure ◽  
Cutting Speed ◽  
High Strength ◽  
Feed Speed ◽  
Machining Parameters ◽  
Deep Hole ◽  
Machining Quality ◽  
Gun Drill

Abstract There are a lot of problems exist in the processing of long and thin deep hole gun drilling of high strength steel, such as insufficient of the machining mechanism and characteristics of gun drilling, difficulty in selecting machining parameters, unknown influence mechanism of machining parameters on drilling force, drilling temperature and machining quality. In this paper, 42CrMo high strength steel is selected as the workpiece material. A numerical model of cutting force is established based on the mechanism of gun drill, and then the finite element simulation and processing test are carried out. The results show that the cutting force decreases with the increase of cutting speed, and increases with the increase of feed speed; the error between the theoretical and actual value is less than 10%. Cutting speed and feed speed have a great influence on machining quality, and the cutting fluid pressure mainly affects the surface roughness.

scholarly journals Corrosion Detection in PSC Bridge Tendons Using Kernel PCA Denoising of Measured MFL Signals

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5984
Author(s):  
Chang Kook Oh ◽  
Changbin Joh ◽  
Jung Woo Lee ◽  
Kwang-Yeun Park
Keyword(s):  
Prestressed Concrete ◽  
Evaluation Method ◽  
Principal Component ◽  
Concrete Bridges ◽  
Kernel Principal Component Analysis ◽  
Cross Sectional ◽  
Measuring Device ◽  
Prestressed Concrete Bridges ◽  
Significant Damage ◽  
Non Destructive

The construction of prestressed concrete bridges has witnessed a steep increase for the past 50 years worldwide. The constructed bridges exposed to various environmental conditions deteriorate all along their service life. One such degradation is corrosion, which can cause significant damage if it occurs on the main structural components, such as prestressing tendons. In this study, a novel non-destructive evaluation method to incorporate a movable yoke system with denoising algorithm based on kernel principal component analysis is developed and applied to identify the loss of cross-sectional area in corroded external prestressing tendons. The proposed method using denoised output voltage signals obtained from the measuring device appears to be a reliable and precise monitoring system to detect corrosion with less than 3% sectional loss.

Simulation Model for the Shape Error Estimation During Machining With Flat Lapping Kinematics

2010 ◽  
Author(s):  
Mariusz Deja
Keyword(s):  
Simulation Model ◽  
Error Estimation ◽  
Average Distance ◽  
Active Surface ◽  
Shape Error ◽  
Shape Accuracy ◽  
Machined Parts ◽  
Shape Errors ◽  
Tool Shape ◽  
High Degree

The selection of a finishing process for a particular application depends on part shape and size, ease of fixturing, requirements concerning the acceptable shape errors. Lapping is the basic flattening process which allows for achieving a high degree of flatness and parallelism of machined parts. It is still one of the most common processes to flatten the sliced silicon wafers. Grinding or wire-sawing induced waviness can be effectively removed or reduced by lapping. A required high degree of the tool flatness is not maintained permanently. The active surface of the tool used for machining with lapping kinematics has some shape errors of concavity or convexity due to the wear. This in turn influences the shape accuracy of the workpiece and the tool flatness must be checked after machining of some workpiece batches. Depending on the tool shape error either the facing operations are carried out to flatten the active surface of the tool or proper kinematical parameters are applied which allow for obtaining required workpiece flatness. Computer simulations can be useful to make o proper decision about achievable accuracy for actual tool shape error. Simulation model for the shape error estimation based on the kinematics of lapping and local shape errors of the tool is presented in the paper. The movement of the workpiece is analyzed and the average distance from the workpiece surface, represented by discrete points, to the tool surface is calculated. Proposed model can be applied for lapping or grinding with single or double discs lapping kinematics. Geometrical and kinematical relations with some simulations are presented in the work.

High Precision Online Measurement Technology to Large Diameter

2013 ◽  
Vol 303-306 ◽  
pp. 376-381
Author(s):  
Wang Biao ◽  
Xiao Fen Yu ◽  
Cong Yu Xu ◽  
Jia Wen Hu
Keyword(s):  
High Precision ◽  
Large Diameter ◽  
Displacement Sensor ◽  
Measurement Technology ◽  
Online Measurement ◽  
Shape Error ◽  
Diameter Measurement ◽  
Compression Deformation ◽  
Extended Uncertainty ◽  
Rolling Wheel

Because of the large diameter’s big volume, heavy weight, high thermal capacity and bad measurement environment, the workpiece’s diameter can only be detected in the processing locale. Though the rolling-wheel method can realize the large diameter online measurement, it can not achieve the diameter high precision measurement influenced by rolling-wheel skidding, compression deformation and temperature distribution. Focusing on the above problem, a new multi function rolling-wheel large diameter measurement system is designed. The designed system mainly researches the main error resource’s distinguish and amendment methods, such as the round grating graduator error, rolling-wheel shape error, rolling-wheel compression deformation, skidding of rolling-wheel to measured axis workpiece and its non-uniform temperature etc. The system can obtain the measured axis’s diameter and roundness real time while getting the needed information of error amendment by integrating multi opto-electronic switch, round grating, reference grating, micro-displacement sensor, temperature sensor etc. The system can realize diameter measurement extended uncertainty 5Dμm(D:1m～10m) and roundness measurement extended uncertainty 1.5Dμm.

Sign in / Sign up

Export Citation Format

Share Document