scholarly journals The Improvement of the Precision of the Archimedean Spiral Toothline Gear Cutting Mill

2021 ◽  
Vol 14 (1) ◽  
pp. 23-29
Author(s):  
Hunor András Gyéresi ◽  
Luciana Cristea ◽  
Márton Máté
Keyword(s):  
Spatial Extent ◽  
Tooth Surface ◽  
Major Influence ◽  
Grinding Wheel ◽  
Secondary Effect ◽  
Profile Error ◽  
Archimedean Spiral ◽  
Theoretical Profile ◽  
Cylindrical Gears

Abstract The precision of gears has a major influence on the quality of the transmission. If the gear cannot be finished by grinding, the precision of the generating tool becomes essential. Archimedean spiral toothline cylindrical gears are obtained by reciprocate meshing using a milling cutter built up by individual cutters, organized in groups. The profiles of edges must be realized with a minimal profile error. In order to ensure the quality and the precision of the meshed tooth surface, and also the profile constancy after re-sharpening, relief faces must be realized by a grinding relieving operation. A secondary effect of the kinematics of relieving end the spatial extent of the grinding wheel a post undercut results and this produces an inevitable profile error. The present paper discusses a possible grinding wheel setting that produces a maximum theoretical profile error under 1μm along the whole re-sharpening reserve of the cutter. The proposed setting can be realized on a classical relieving lathe.

scholarly journals Grinding burns in the technological surface of the gear teeth of the cylindrical gears

Mechanik ◽  
2017 ◽  
Vol 90 (10) ◽  
pp. 882-884
Author(s):  
Tadeusz Zaborowski ◽  
Ryszard Ochenduszko
Keyword(s):  
Grain Size ◽  
Tooth Surface ◽  
Grinding Wheel ◽  
Gear Teeth ◽  
Cylindrical Gears ◽  
Number Of Teeth ◽  
Heat Effects ◽  
Cutting Zone

The article presents the results of research on the grinding of the technological grinding of the tooth surface of toothed wheel cylinders. The toothed teeth with straight teeth, modules m = 2÷6 mm, bore width b = 26÷94 mm, number of teeth with z = 12÷48 made of 40H and 12H2N4A steel with a hardness of 60 HRC. For grinding, T1Q grinding wheel has the following parameters: D = 350 mm, H = 25 mm, δ = 140°, grains 99A, grain size 60, hardness H, structure 5, binder V. The results of tests show the dependence of grinding scales on the parameters used machining and thickness of the sliced layer and this means the heat effects in the cutting zone.

Research on Simulation of Rotary Burrs NC Grinding

2008 ◽  
Vol 392-394 ◽  
pp. 487-492
Author(s):  
Guan Wei Zhang ◽  
S.C. Zhang ◽  
Yu Tian Lin
Keyword(s):  
Simulation Analysis ◽  
Tooth Surface ◽  
Grinding Wheel ◽  
Tool Shape ◽  
Tool Trajectory ◽  
Security Region ◽  
Rotational Part ◽  
Grinding Machine ◽  
Nc Grinding

A 3D rotary burrs grinding simulation system is described. By analyzing the structure of rotary burrs 4-axis NC grinding machine tool, rotary burrs grinding motion model is established. The method of axis direction decomposition based on 3D modeling is provided, which includes decomposing rotational part into simple primitive cells by using Visual C++ and OpenGL as the developing tools, and implementing the boolean operation between the part model and a tool sweeping solid dependent on the tool shape and tool trajectory for each tool movement. To use grinding machining simulation analysis of the interference resulted in grinding, main factors range is determined. Security region is identified in order to avoid interference between grinding wheel and the tooth surface, which can be used for guiding production of rotary burrs and improving the quality of grinding.

Administrasi Hubungan Sekolah dan Masyarakat

2020 ◽  
Author(s):  
Fisma Janusuri
Keyword(s):  
Community Participation ◽  
Community Empowerment ◽  
Major Influence ◽  
Learning Achievement ◽  
Quality Of Learning ◽  
Good Schools ◽  
Education Process

Community empowerment in education is needed especially to support the implementation of good schools. The level of community participation in the education process in this school seems to have a major influence on the progress of the school, the quality of learning services in schools which will ultimately affect the progress and learning achievement of children in school.

Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

2007 ◽  
Vol 24-25 ◽  
pp. 229-232
Author(s):  
S.L. Ma ◽  
Wei Li ◽  
Cong Rong Zhu ◽  
J. Zhang ◽  
H.C. Ye
Keyword(s):  
Grain Size ◽  
Cast Iron ◽  
Tungsten Carbide ◽  
Surface Quality ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Different Grain Size ◽  
Grinding Efficiency ◽  
Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

Algicidal and Bactericidal Effect of Potassium Monopersulfate Compound on Eutrophic Water

2014 ◽  
Vol 707 ◽  
pp. 259-262 ◽  
Author(s):  
Ming Song Wu ◽  
Xin Yang Xu ◽  
Xun Xu ◽  
Yue Ting Zeng ◽  
Jing Nan Zhang ◽  
...  
Keyword(s):  
Contact Time ◽  
Influence Factors ◽  
Bactericidal Effect ◽  
Major Influence ◽  
Treatment Efficiency ◽  
Compound A ◽  
Eutrophic Water ◽  
Landscape Water ◽  
Algae And Bacteria

Algae and bacteria blooms in eutrophication in summer have made the quality of landscape water degradation. Treatment efficiency of potassium monopersulfate compound, a new kind of oxidation reagent, on killing algae and bacteria has been valued and the effect of influence factors, such as dosage, contact time and temperature are also discussed. The results indicated that potassium monopersulfate is appropriate for killing algae and bacteria in landscape water, dosage and contact time are the major influence factors. The contact time should be longer than 20min and the algicidal rate is higher when the temperature is above 20°C.

Computation of Parameters of a Form Grinding Wheel for Grinding of Shaving Cutter for Plunge Shaving of Topologically Modified Involute Pinion

2005 ◽  
Vol 127 (4) ◽  
pp. 819-828 ◽  
Author(s):  
Stephen P. Radzevich
Keyword(s):  
Transmission Error ◽  
Low Noise ◽  
Tooth Surface ◽  
Grinding Wheel ◽  
Cnc Machine ◽  
Surface Machining ◽  
Form Grinding ◽  
Novel Approach ◽  
Light Trucks ◽  
Part Surface

The paper is targeting on the finishing of precision gears for low-noise/noiseless transmission for cars and light trucks. Transmission error is the predominant cause of gear noise. The application of a topologically modified pinion results in reduction of transmission error up to two times. The required modification of the pinion tooth surface is provided on a plunge shaving operation with application of a shaving cutter of an appropriate design. A novel approach for computation of parameters of a form grinding wheel for grinding of the shaving cutter for plunge shaving of a precision involute pinion with topologically modified tooth surface is reported in the paper. The developed approach for computation of parameters of the form grinding wheel is focused on application of the shaving cutter grinder with a lack of CNC articulation. The problem under consideration is solved using the DG/K-based approach of part surface machining earlier developed by the author. (The DG/K-approach is based on fundamental results obtained in differential geometry of surfaces, and in kinematics of multi-parametric motion of a rigid body in E3 space (See Radzevich, S.P., Sculptured Surface Machining on Multi-Axis CNC Machine. Monograph, 1991, Vishcha Shkola Publishers, Kiev (in Russian). See also Radzevich, S.P., 2001, Fundamentals of Surface Machining. Monograph, Rastan, Kiev (in Russian).) An analytical solution to the problem is discussed in the paper. The solution has been used for developing software for the Mitsubishi ZA30CNC shaving cutter grinder for the needs of the automotive industry. Computer simulation reveals high accuracy of the ground shaving cutter.

Einfluss der Abrichtgrößen beim Schleifen*/Influence of dressing parameters on the grinding process - Systematic research of dressing parameters on workpiece roughness and surface integrity

2016 ◽  
Vol 106 (01-02) ◽  
pp. 44-50
Author(s):  
T. Lierse ◽  
B. Karpuschewski ◽  
T. R. Kaul
Keyword(s):  
Aluminum Oxide ◽  
Surface Integrity ◽  
Cvd Diamond ◽  
Grinding Wheel ◽  
Systematic Research ◽  
Grinding Process ◽  
Wheel Topography ◽  
Grinding Wheel Topography

Dieser Beitrag zeigt, dass die durch die Abrichtparameter erzeugte Schleifscheibentopographie nicht nur die Oberflächengüte des Werkstücks, sondern auch dessen Eigenspannungszustand in der Werkstückrandzone in weiten Grenzen verändert. Die Untersuchungen zum Abrichten von Korundschleifscheiben mit einer CVD-Diamantformrolle stellen den Zusammenhang zwischen dem Abrichten unterschiedlicher Schleifscheiben zur Bauteilqualität in Form der Oberflächenrautiefe und randzonennahen Eigenspannungen her.   The quality of the workpiece rim is changed by every grinding process. The grinding wheel topography created by the dressing process has not only influence on the workpiece roughness but also on the surface integrity. The pointed research using aluminum oxide abrasive wheels dressed by CVD diamond dressing discs shows a correlation between the dressing parameters, the workpiece roughness and the surface integrity.

New Active Online Balancing Method for Grinding Wheel Using Liquid Injection and Free Dripping

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Xining Zhang ◽  
Xu Liu ◽  
Huan Zhao
Keyword(s):  
Grinding Wheel ◽  
Time Varying ◽  
Residual Liquid ◽  
Grinding Wheels ◽  
Abrasive Particles ◽  
Balance Condition ◽  
Liquid Injection ◽  
Grinding Machines ◽  
The Relationship

Grinding is a vital method in machining techniques and an effective way to process materials such as hardened steels and silicon wafers. However, as the running time increases, the unbalance of grinding wheels produce a severe vibration and noise of grinding machines because of the uneven shedding of abrasive particles and the uneven adsorption of coolant, which has a severe and direct impact on the accuracy and quality of parts. Online balancing is an important and necessary technique to reduce the unbalance causing by these factors and adjust the time-varying balance condition of the grinding wheel. A new active online balancing method using liquid injection and free dripping is proposed in this paper. The proposed online balancing method possesses a continuous balancing ability and the problem of losing balancing ability for the active online balancing method using liquid injection is solved effectively because some chambers are full of liquid. The residual liquid contained in the balancing chambers is utilized as a compensation mass for reducing rotor unbalance, where the rotor phase is proposed herein as a target for determining the machine unbalance. A new balancing device with a controllable injection and free dripping structure is successfully designed. The relationship between the mass of liquid in the balancing chamber and the centrifugal force produced by liquid is identified. The performance of the proposed method is verified by the balancing experiments and the results of these experiments show that the vibration of unbalance response is reduced by 87.3% at 2700 r/min.

scholarly journals EVALUASI IMPLEMENTASI KEBIJAKAN SISTEM PENYULUHAN PERTANIAN DI KABUPATEN BEKASI

2016 ◽  
Vol 17 (02) ◽  
pp. 62-75
Author(s):  
Rasminto Rasminto
Keyword(s):  
Human Resource Development ◽  
Local Governments ◽  
Agricultural Extension ◽  
Major Influence ◽  
Department Of Agriculture ◽  
Optimal Function ◽  
Technical Extension ◽  
Executive Agency ◽  
Limited Motion

Bekasi regency as one of the mainstays of agriculture of West Java province is one area that can not escape from the problems of human resource development of agriculture that should get attention by local governments, the private sector and local communities. Many factors that cause deterioration of agriculture in Bekasi Regency, among others; not optimal function of the institution / organization of Agricultural Extension, operational techniques ranging from counseling; extension of distribution, identification of potential areas of extension, aspects of planning and implementation. The purpose of this study was to evaluate the implementation of agricultural extension in Bekasi based aspects of the functions of institutions / organizations and operational technical extension further identify potential areas of agricultural extension.The method used in this study is a qualitative method, ie by observation, interviews and observations documents.The results showed that: (1) Institutions / organizations that form the Executive Agency of Agricultural Extension as an institution is still limited motion in terms of both quantity and quality of personnel, bergaining institutions still sometimes overlaps with the Department of Agriculture. (2) There are still required the addition and improvement of facilities / infrastructure of agricultural extension services so as to improve the quantity and quality of the target areas. (3) Implementation of outreach are still many obstacles execution as their major influence on the political Pilkades, information outreach activities that still have not been absorbed by the farmer that still few farmers who take part in counseling, technology transfer and transfer of regeneration as a target of the main actors, and the synergy between the authorities village extension workers are not optimal.

scholarly journals Alternative solid fuels combustion in small heat source

2018 ◽  
Vol 168 ◽  
pp. 08002 ◽  
Author(s):  
Michal Holubčík ◽  
Nikola Kantová ◽  
Jozef Jandačka ◽  
Zuzana Kolková
Keyword(s):  
Heat Source ◽  
Alternative Fuels ◽  
Beech Wood ◽  
Major Influence ◽  
Heat Output ◽  
Heat Sources ◽  
Gaseous Emissions ◽  
Output Efficiency ◽  
Negative Factors

Air quality is related to the using of solid fuel based heat sources in which the human factor has a major influence on the quality of combustion, which can lead to higher emissions into the air. One of the negative factors is the use of alternative fuels in heat sources. The article deals with the combustion of various alternative fuels, on a waste basis, in small heat sources. There were tested 4 types of fuels: beech wood pieces, 2 types of solid alternative fuel on the base of municipal waste and wood waste. In the experiment, it was tested the influence of used fuel in the fireplace on the heat output, efficiency, production of gaseous emissions and particulate matter. The results confirmed that combustion of fuels not recommended by the heat source manufacturer reduces the efficiency of combustion and significantly increases all monitored emissions.

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