Research on NC Point-Grinding of the Curve Based on Normal Tracing

2006 ◽  
Vol 304-305 ◽  
pp. 488-491 ◽  
Author(s):  
Q.J. Wu ◽  
De Jin Hu
Keyword(s):  
New Technology ◽  
Point Contact ◽  
Mathematic Model ◽  
Grinding Wheel ◽  
Work Piece ◽  
Normal Vector ◽  
Nc Programming ◽  
Kinematic Relationship ◽  
New Type ◽  
Profile Accuracy

This paper presents a new technology, which is the normal tracing, for NC point-grinding of the curve. The development of the technology is based on the simultaneous three-axis machining. By controlling the superposition between the rotary surface of the grinding wheel and the normal vector of the curve, point contact between them is realized. So grinding just like turning, the abrasive machining of the complex curve is easy to be realized. The main advantage of the technology is the fact that it can not only reduce the deformation of the grinding wheel and simplify the NC programming, but also improve surface quality and profile accuracy. This paper builds the mathematic model of the normal tracing by analyzing the geometric property and the kinematic relationship between the wheel and the work piece. Then the control algorithm of the normal tracing is given and used in a new-type digital curve grinder successfully, MD9040 developed by ourselves.

Study on Non-Interference Normal Tracking Algorithm for NC Quick-Point Grinding of the Curve Parts

2006 ◽  
Vol 532-533 ◽  
pp. 885-888
Author(s):  
Yu Mei Luo ◽  
Qi Wu ◽  
De Jin Hu
Keyword(s):  
New Technology ◽  
Mathematic Model ◽  
Normal Direction ◽  
Tracking Algorithm ◽  
Grinding Wheel ◽  
Normal Vector ◽  
Grinding Process ◽  
Machining Precision ◽  
New Type ◽  
Digital Curve

In traditional NC curve grinding, the grinding wheel’s rotary surface is generally not on the grinding point’s normal direction, which will bring the distortion of grinding wheel and decrease the machining precision. This paper presents a new technology, which is called the non-interference normal tracking for NC curve grinding process. By controlling the worktable to rotate in the x-y plane, the superposition between the rotary surface of the grinding wheel and the normal vector of the workpiece’s contour is realized, and the interference between the wheel’s body and the workpiece could be avoided at the same time. A mathematic model is established and an algorithm to calculate the worktable’s rotary angle is proposed. Finally, the algorithm is applied in a new-type digital curve grinder successfully. The results show that the method is reliable and effective.

scholarly journals Hacia una caracterización lingüística de las interacciones en WhatsApp

Triangle ◽  
2020 ◽  
pp. 69
Author(s):  
Marina Silva Alcántara
Keyword(s):  
Nonverbal Communication ◽  
New Technology ◽  
Computer Mediated Communication ◽  
Written Language ◽  
Mediated Communication ◽  
Computer Mediated ◽  
Technological Context ◽  
New Type ◽  
Linguistic Level

The emergence of new communicative contexts and new forms of interaction has led to changes in the ways of communicating. Some authors speak of a new communicative paradigm caused by a new level of interaction arisen in the technological context. In this article, we focus on a new technology that can be included in the so-called computer mediated communication: WhatsApp. The aim of this work is to study WhatsApp interactions understood as a particular type of computer-mediated talks. Specifically we will: 1) Characterize the language used in WhatsApp interactions at every linguistic level, from phonetics to pragmatics, through morphology, vocabulary and syntax. 2) Analyze how the absence of nonverbal communication (paralanguage and kinesics) in such interactions is managed. 3) Determine whether WhatsApp interactions are manifestations of spoken or written language, or, on the contrary, they are a new type of language that cannot be classified as oral or written. And 4) determine whether WhatsApp interactions can be qualified as conversational.

Study on Effect of Grinding Fluid Supply Parameters on Surface Integrity in Quick-Point Grinding for Green Manufacturing

2008 ◽  
Vol 53-54 ◽  
pp. 209-214 ◽  
Author(s):  
Shi Chao Xiu ◽  
Ya Dong Gong ◽  
Guang Qi Cai
Keyword(s):  
Surface Integrity ◽  
High Speed ◽  
Point Contact ◽  
Green Manufacturing ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Fluid ◽  
Fluid Supply ◽  
High Speed Grinding ◽  
Grinding Power

In high and super-high speed grinding process, there is an airflow layer with high speed around the circle edge of the grinding wheel that hinders the grinding fluid into contact layer, namely, the air barrier effect. The speed of airflow layer is directly proportional to the square of the wheel speed. Quick-point grinding is a new type of high and super-high speed grinding process with a point contact zone and less grinding power. The edge effect of the air barrier is weakened because the thin CBN wheel is applied in the process. By the analysis of dynamic pressure and velocity distributions in the airflow layer around the wheel edge, the mathematic models of the flow and jet pressure of grinding fluid for effective supply in the process were established and the process of optimization calculation of the jet nozzle diameter for green manufacturing was also analyzed based on the thermodynamics and the technical character of quick-point grinding process. The quick-point grinding experiment for surface integrity influenced by grinding fluid supply parameters was performed.

Development on Micro Precision Truing Method of ELID-Grinding Wheel (2nd Report: Application to Edge Sharpening of Large Wheel)

2005 ◽  
Vol 291-292 ◽  
pp. 213-220 ◽  
Author(s):  
Shao Hui Yin ◽  
Wei Min Lin ◽  
Yoshihiro Uehara ◽  
Shinya MORITA ◽  
Hitoshi Ohmori ◽  
...  
Keyword(s):  
Surface Quality ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Elid Grinding ◽  
Diamond Grinding ◽  
Grinding Performance ◽  
Profile Accuracy ◽  
Large Wheel ◽  
Edge Sharpening

In V-groove ELID grinding process, to achieve optimal grinding performance and satisfactory surface quality and profile accuracy, metal bonded diamond grinding wheels need to be carefully sharpened. In this paper, we applied the proposed new micro-truing method consisting of electro-discharge truing and electrolysis-assisted mechanical truing to sharpen the edge of large grinding wheels. The minimum wheel tip radiuses of 6.3 and 8.5µm were achieved for the #4000 and #20000 grinding wheels. The truing mechanisms and sharpening performance are also discussed.

Development of Reduced Rolling Process for Steel Plate

2012 ◽  
Vol 706-709 ◽  
pp. 2101-2106
Author(s):  
Xiu Hua Gao ◽  
Hui Fang Lan ◽  
Lin Xiu Du ◽  
Chun Lin Qiu
Keyword(s):  
Low Cost ◽  
New Technology ◽  
Rolling Process ◽  
Steel Plates ◽  
High Rate ◽  
Iron And Steel Industry ◽  
Iron And Steel ◽  
Heavy Plate ◽  
New Type ◽  
Microstructure And Mechanical Property

The low cost Q460 and Q550 steel plates were produced in the 4200mm wide and heavy plate mill using Normal Hot Rolling and High Rate Cooling (NHR+HRC) process. The effect of both rolling processes on microstructure and mechanical property was studied. The results indicate that new type process can realize the good match between microstructure and mechanical properties. Meanwhile the new technology can short rolling time, reduce alloying addition, and improve the output of mill, it is also promote iron and steel industry developing continuously.

Study on Design and Innovation of New-Type Environment-Friendly Landscape Environmental Sanitation Facilities

2011 ◽  
Vol 393-395 ◽  
pp. 1451-1455
Author(s):  
Jun Xu ◽  
Chun Mei Gao
Keyword(s):  
Urban Landscape ◽  
New Technology ◽  
Real Life ◽  
Current Status ◽  
Environment Friendly ◽  
Environmental Sanitation ◽  
Life Patterns ◽  
Advanced Technologies ◽  
Innovative Idea ◽  
New Type

Focusing on the current urban environmental sanitation facilities, this paper analyzes the current status of environmental sanitation facilities. Combining with various objects and life patterns in daily life, it discusses about the wide application of landscape environmental sanitation facilities in real life and particularly studies the landscape property of garbage containers. The advanced technologies are employed in the garbage disposal containers to design the environment-friendly, green and energy-saving new-type landscape environmental sanitation facilities. Moreover, it points out the significance of creating new technology and new concept in the urban landscape facilities, and adopts the innovative idea and new concept to realize the harmonious and wonderful human settlement.

EHD Lubrication Characteristics of a New Type of Ground Cylindrical Worm Gearing

1997 ◽  
Vol 119 (1) ◽  
pp. 101-107 ◽  
Author(s):  
V. Simon
Keyword(s):  
Density Variation ◽  
Grinding Wheel ◽  
Oil Viscosity ◽  
Circular Arcs ◽  
Ehd Lubrication ◽  
Highly Nonlinear ◽  
Load Carrying ◽  
Worm Gearing ◽  
New Type ◽  
Lubrication Characteristics

A full thermal elastohydrodynamic analysis of lubrication of a new type of cylindrical worm gearing with concave worm profile, ground by a grinding wheel whose profile consists of two circular arcs, is presented. The EHD lubrication analysis is based on the simultaneous solution of the Reynolds, elasticity, energy, and Laplace’s equations. The oil viscosity variation with respect to pressure and temperature and the density variation with respect to pressure are included. The finite difference method and numerical integration have been used to get the solution of the highly nonlinear integrodifferential system of governing equations. By using a computer program, the influence of design and operating parameters of the new type of worm gearing on EHD lubrication characteristics has been investigated. Also, the comparison of the EHD load carrying capacity and of the power losses in the oil film of the new type and of the commonly used cylindrical worm gearings has been carried out.

Wear of Diamond Grinding Wheel during Low Speed Dressing by Alumina

2015 ◽  
Vol 658 ◽  
pp. 120-124
Author(s):  
Tachai Luangvaranunt ◽  
Natthawat Tangkaratanakul ◽  
Patchanok Sakultantimetha
Keyword(s):  
High Hardness ◽  
Large Mass ◽  
Diamond Wheel ◽  
Grinding Wheel ◽  
Work Piece ◽  
Wheel Wear ◽  
Diamond Grinding Wheel ◽  
Diamond Grinding ◽  
Dressing Tool ◽  
Pin On Disk

Diamond grinding wheel is used in high precision grinding process, when work piece has a very high hardness. For a specific grinding interval, the wheel must be properly dressed, in order to remove swarf, sharpen the worn diamond grits, open up new diamond protrusions, and recondition the bond material. Dressing of diamond grinding wheel by alumina dressing tool has been simulated in a pin-on-disk machine in the research. Sharpening of the wheel is indicated by the increase of its roughness value, and surface microstructure with protruding sharp diamond grits. It was found that increasing of sliding distant from 100 to 500 m will increase the roughness of the wheel. The increase of contact load from 10 to 20 N will also increase roughness of the wheel, and the severity of wheel wear, indicated by high values of friction coefficient. A proper dressing of this nickel bonded SD1200 diamond wheel is by sliding against alumina dressing tool for at least 300 m under 10 N load. Sliding velocity has minimal effect to the results. A too large sliding distant and load will cause severe damage to wheel surface, and severe wheel wear, indicated by its large mass loss.

The Application of Enhanced Cooling Technology to Grinding Process

2013 ◽  
Vol 442 ◽  
pp. 36-39
Author(s):  
Ke Ma
Keyword(s):  
Heat Transfer ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Surface Burning ◽  
New Type ◽  
Cooling Technology ◽  
The Comparative Study

An experimental study was performed to analyze the feasibility of heat pipe cooling in creep feed grinding applications. A new type of grinding wheel is developed to enhance the heat transfer of the grinding contact zone then decrease the grinding temperature. The performance of the new type grinding wheel was evaluated by measuring the grinding temperature when it was creep feed grinding the Ti-6Al-4V Alloy and the experimental results were compared with an ordinary grinding wheel. Results of the comparative study indicated that the use of enhanced cooling technology in a grinding wheel can decrease the grinding temperature significantly thus avoid the surface burning in grinding.

A New Gears Profile Having Zero Relative Curvature at Many Contact Points (LogiX Tooth Profile)

1990 ◽  
Vol 112 (3) ◽  
pp. 430-436 ◽  
Author(s):  
T. Komori ◽  
Y. Ariga ◽  
S. Nagata
Keyword(s):  
Point Contact ◽  
Spur Gear ◽  
Tooth Profile ◽  
Spur Gears ◽  
New Era ◽  
Contact Points ◽  
History Of ◽  
Surface Durability ◽  
New Type ◽  
Zero Values

We have successfully developed a tooth profile which enables a spur gear having zero relative curvature at contact points under the engagement through the concave/convex pattern of contact and further enables a single flank of the tooth profile to have the infinite number of points where the relative curvature and specific sliding are zero values. We have given a name of “LogiX” to this tooth profile. A W-N (Wildhaber-Novikov) tooth profi¨le has been known as that having the concave/convex pattern of contact. The tooth profile, however, is applied only to a helical gear due to its feature of a point contact. While, on the LogiX tooth profile, an improvement has been made so that a pair of spur gears having the tooth profile may contact each other through the concave/convex pattern of a line-contact which cannot be achieved by the W-N tooth profile. Therefore, the LogiX tooth profile has realized a spur gear whose surface durability is as high as that of the W-N tooth profile. Since the results of durability tests show slightly higher than an involute one, it is expected that a new type heavy duty gear of this tooth profile puts into practical use. Furthermore, the tooth profile will have the possibility of creating the new era in the history of tooth profile theory.

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