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 INVESTIGATION OF THE PROCESS OF DOUBLE-SIDED GRINDING OF TORCHES OF PUSHERS WITH DIFFERENT DIAMETRERS

2018 ◽  
pp. 86-93
Author(s):  
Oleksandr Lytvyn ◽  
Kalchenko Dmytro Kalchenko
Keyword(s):  
Large Scale ◽  
Maximum Diameter ◽  
Grinding Wheel ◽  
Universal Method ◽  
Grinding Wheels ◽  
Processing Efficiency ◽  
Agricultural Engineering ◽  
Grinding Machines ◽  
Precision Of Processing ◽  
Different Diameters

Urgency of the research. In machine tools, automotive, agricultural engineering, manufacturing, where it is necessary to ensure high accuracy of surfaces of parts with different diameters of faces, it is required to adhere to high requirements for the quality of geometric sizes, roughness and accuracy of molding. Target setting. Grinding of end surfaces of parts with different diameters of faces, is carried out on two-sided end-grinding machines. The specific gravity of grinding in the total complexity of mechanical processing is constantly increasing and at the present stage it is about 30 % in the machine tool industry, in the automotive industry more than 38% of the total complexity of processing. Actual scientific researches and issues analysis. On the two-sided end-grinding machines of the Saturn company (Germany) the processing of round ends of parts is done with a circular feed to the processing area. Abrasive wheels are used without calibrating plots, which requires a lot of processing to obtain the required precision, which reduces the productivity of grinding. The disadvantage of the method is that the processing of parts with different face diameters is not considered. Uninvestigated parts of general matters defining. It is necessary to improve the processing efficiency of parts by developing the methods of two-sided polishing of the ends of pushers with different diameters oriented grinding wheels with and with-out calibrating sections, and also the rotation or without rotation of the workpiece on the calibration section, at least one revo-lution. The research objective. Improving the accuracy of finishing the end surfaces of parts of various diameters with grinding wheels, is achieved by the fact that the shaping of the ends of the smaller diameter is performed by the maximum diameter of the flat end of one circle, and the shaping of the end face of a larger diameter – the calibration section of the second circle, the length of which is equal to the diameter of the larger end and filled with diamond pencil, which moves along a radius, which coincides with the radius of the location of the axes of the parts in the feed drum. The statement of basic materials. In order to ensure the processing of parts in one pass and the necessary precision of processing, in large-scale and mass production, a grinding method oriented circles with calibrated sections with one-sided arrangement of ends of one diameter is used. The calibration sections are then made of different lengths, depending on the diameter, respectively, larger and smaller. Conclusions. The universal method of practical application of model of accuracy of shaping of ends of parts of different diameters, oriented grinding circles with and without calibration plots has been suggested. The presented method simplifies the grinding of the grinding wheel. It does not require special editing and allows to use regular editing.

Effect of the Coolant Lubricant Type and Dress Parameters on CBN Grinding Wheels Performance

2009 ◽  
Vol 76-78 ◽  
pp. 163-168 ◽  
Author(s):  
Taghi Tawakoli ◽  
Abdolreza Rasifard ◽  
Alireza Vesali
Keyword(s):  
Grinding Wheel ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Workpiece Surface ◽  
Vitrified Cbn

The efficiency of using of CBN grinding wheels highly depends on the dressing process as well as on the coolant lubricant used. The Institute of Grinding and Precision Technology (KSF) investigated the performance of vitrified CBN grinding wheels -being dressed using different parameters- while using two different grinding oils and two different water-miscible coolant lubricants. The obtained results show that the performance of the vitrified CBN grinding wheels regarding the quality of the workpiece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the dressing conditions and the type of the coolant lubricant used. Compared to the water-miscible coolant lubricants, the grinding oils show better results.

Effect of the Grinding Oil Type on CBN Grinding Wheels Performance

2009 ◽  
Author(s):  
Taghi Tawakoli ◽  
Abdolreza Rasifard ◽  
Alireza Vesali
Keyword(s):  
Heat Resistance ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Work Piece ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Vitrified Cbn ◽  
Oil Type

The efficiency of the grinding process highly depends on the coolant lubricant used. In grinding with CBN grinding wheels grinding oils are used increasingly. In the last decade new grinding oils based on different oil types are brought into the market, whose effect on the CBN grinding wheels performance until now not sufficiently been investigated. The Institute of Grinding and Precision Technology (KSF) investigated the influence of four different grinding oils on the performance of vitrified CBN grinding while grinding of 100Cr6 (M.-No. 1.3505), which is a heat-treatable steel with a very good grindability, and Nimonic A80, which is a difficult to grind heat-resistance superalloy. The obtained results show that the performance of the vitrified CBN grinding wheels—while using grinding oil as coolant lubricant—regarding the quality of the work piece surface, the grinding forces as well as the wear of the grinding wheel, highly depend on the viscosity of the grinding oil. Moreover, the results show that the surface quality and the grinding forces while using different grinding oils depend significantly on the work piece material.

scholarly journals New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding

10.14311/1598 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Ondrej Jusko
Keyword(s):  
Surface Quality ◽  
Bearing Steel ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Abrasive Material ◽  
Abrasive Grains ◽  
Measurement Results ◽  
New Type

This paper focuses on the influence of various types of abrasive grains on cutting properties during the grinding process for bearing steel. In this experiment, not only conventional super-hard abrasive materials but also a new type of abrasive material were employed in grinding wheels. The measurement results were compared, and an evaluation was made of the cutting properties of the new abrasive material. The options were then evaluated for their practical applicability. The measurement results indicated that a grinding wheel with Abral and SG grains is the most suitable for grinding hardened bearing steel in order to achieve the best roughness and geometrical accuracy.

The Influence of Electric Parameters on the Surface Quality of Ceramic in Internal Grinding Using the Ultrasonic and ELID Composite Grinding

2014 ◽  
Vol 596 ◽  
pp. 47-51 ◽  
Author(s):  
You Yi Zheng ◽  
Hao Pang ◽  
Qi You ◽  
Xiao Feng Jia
Keyword(s):  
Oxide Film ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Electrical Parameters ◽  
Diamond Grinding Wheel ◽  
Internal Grinding ◽  
Electric Parameters ◽  
The Relationship ◽  
Selection Of

Analyzed the relationship between electrical parameters of the ultrasonic and electrolytic in-process dressing (ELID) composite grinding and the surface quality of the ceramic through the experiment. The value of the voltage and the current were recored by labview and the surface quality of the ceramic was tested using Talysurf CCI 6000 In the experiment. The results show that the selection of electrical parameters affects the electrolysis speed of diamond grinding wheel and the speed of the oxide film formed and the quality of the oxide film, and then affects the grinding performance of the grinding wheel and the grinding quality of workpiece.

scholarly journals Research of working capacity of grinding wheels

2018 ◽  
Vol 224 ◽  
pp. 01005
Author(s):  
Tatyana N. Ivanova
Keyword(s):  
Temperature Field ◽  
Operation Mode ◽  
Grinding Wheel ◽  
Abrasive Tool ◽  
Working Capacity ◽  
Grinding Wheels ◽  
Temperature Stresses ◽  
Heating And Cooling ◽  
Abrasive Grain

The processing of materials by cutting with abrasive tool is carried out by means of thousands of grains bonded together as a single whole. The quality of abrasive tool is defined by cutting properties of abrasive grains and depends on features of spreading of temperature field in time and in abrasive grain volume. Grains are exposed to heating and cooling during work. It leads to undesired effects such as decrease of durability of grain retention in the binder, hardness, intensification of diffusion and oxidation processes between the binder and grain, the occurrence of considerable temperature stresses in the grain itself. Obtained equation which allows calculation of temperature field of grain for one rotation of grinding wheel shows that the temperature of the wheel depends on grinding modes and thermophysical properties of abrasive material. Recommendations for working capacity of grinding wheels in each operation mode and with a transition from one mode to another are given. As a result of research different dependencies were determined. They include dependencies governing the extent of influence of granularity, difference in height and concentration of grains, geometry parameters of detail to be machined and grinding wheel on machining modes and the thickness of layer cutoff by one grain.

scholarly journals Calculating the profile of intermittent grinding wheel for the sharpening teeth of the broach

2018 ◽  
Vol 224 ◽  
pp. 01003
Author(s):  
Vladimir Bogutsky ◽  
Yurij Novoselov ◽  
Leonid Shron
Keyword(s):  
Metal Cutting ◽  
Cutting Tools ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Discontinuous Surface ◽  
Thermodynamic Conditions ◽  
Cutting Zone ◽  
Grinding Operations ◽  
Process Productivity

The article shows that during the grinding of complex profile blades of metal cutting tools from tool steels, unfavorable thermodynamic conditions are created in the cutting zone and, as a result, grinding burns and cracks occur on the surface of the polished workpiece. One of the methods of controlling the temperature in the cutting zone at the final grinding operations is the use of grinding wheels with a discontinuous surface. The method of calculating the profile of the discontinuous surface of the grinding wheel presented in the article makes it possible to determine its geometric parameters taking into account the wear resistance of the grinding wheel and the heat stress of the process of treatment. The results of the verification of the proposed technique in the production conditions are given which showed that the treatment of the teeth of the broaches with a grinding wheel with a discontinuous profile, in comparison with the machining of broaches according to the traditional technology, provides a higher quality of blade surfaces, while the process productivity, compared with the factory technology, increased by 20...26%.

scholarly journals ПІДВИЩЕННЯ ТОЧНОСТІ ТА ПРОДУКТИВНОСТІ ОБРОБКИ ТОРЦІВ РОЛИКІВ ПІДШИПНИКІВ КОЧЕННЯ

2019 ◽  
pp. 9-17
Author(s):  
Volodymyr Kalchenko ◽  
Dmytro Kalchenko ◽  
Volodymyr Venzhega ◽  
Sergiy Ryabov
Keyword(s):  
High Performance ◽  
High Accuracy ◽  
Machining Process ◽  
Grinding Wheels ◽  
Treatment Area ◽  
Rolling Bearings ◽  
High Productivity ◽  
Roller Bearings ◽  
Grinding Machines

Urgency of the research. High-precision and productive machining of the ends of the rollers of the roller bearings is an urgent and important scientific and practical task, the solution of which will allow both to prolong the life of the bearings and to reduce their production, and therefore to increase the level of competitiveness of production. Target setting. The main requirements relating to the rollers of the rolling bearings are to ensure the high accuracy of size, shape, quality of end surfaces with high productivity of the machining process. Actual scientific researches and issues analysis. The main directions of improving the accuracy and productivity of two-sided grinding are to increase the rigidity of the machine-tool-tool-part system, to reduce the thermal impact, to improve the kinematic characteristics of the workpiece movement in the treatment area, to optimize the design and characteristics of grinding wheels. Uninvestigated parts of general matters defining. One of the most promising areas for improving the accuracy and productivity of the double-sided grinding process is to use the effect of crossing axes of grinding wheels and billets with special tool profiling. The purpose of the article. To analyze the factors that affect the accuracy and productivity of machining the end surfaces of parts on two-sided grinding machines and to develop a new high-performance method of processing the end surfaces of the rollers of the roller bearings, which would provide the possibility of assembly between the rolling bodies and the rings, not by a selective method. The presentation of the main material. The combined editing of the two planes of grinding wheels on two-sided grinding machines enables to obtain a larger diameter of the calibration section. In this case, the entire allowance is cut off in the area adjacent to the gauge. The calibration section at the inlet of the parts in the treatment area does not participate in cutting off the seam allowance, has high stability and at the outlet forms the final accuracy of the end surfaces. Conclusions and suggestions. The paper proposes a new high-performance method of single-pass machining of the end surfaces of the rollers of the roller bearings on two-sided grinding machines with oriented grinding wheels, which have a calibration section, which ensures high accuracy of processing. This method allows to reduce the scattering range of sizes and to go to the method of complete interchangeability when assembling the bearing units.

The Characteristic of Organic Bond Grinding Wheel

2007 ◽  
Vol 359-360 ◽  
pp. 63-67
Author(s):  
Mei Wei Chen ◽  
Ju Long Yuan ◽  
Yi Yang ◽  
Dong Qiang Yu
Keyword(s):  
Literature Review ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Abrasive Grains ◽  
Organic Bond

The bond in a grinding wheel cements the abrasive grains together, Among other factors, the bond plays a predominant part in the grinding wheel performances and on the quality of grinding results. This paper presents a literature review on organic bond grinding wheels. It discusses the characteristic of the bond and the grinding performances of the two mainly types of organic bond [1] grinding wheels: the resin bond grinding wheel and the soft-elastic grinding wheel. This paper provide a conclusion of the studying state of organic grinding wheel, which new studying can draw lesson from.

ON THE INFLUENCE OF OPERATING CHARACTERISTICS OF GRINDED WHEELS ON THE QUALITY INDICATORS OF GRINDED PARTS

2020 ◽  
pp. 86-92
Author(s):  
Марчук І. В. ◽  
Марчук В.І. ◽  
Джугурян Т.Г. ◽  
Гринюк С.В. ◽  
Карпюк В.О.
Keyword(s):  
Roller Bearing ◽  
Correct Choice ◽  
Stable Operation ◽  
Abrasive Tool ◽  
Operating Characteristics ◽  
Grinding Wheels ◽  
Grinding Machines ◽  
Quality Surface ◽  
Selection Of

The quality of the surfaces of roller bearing parts is formed in the process of interaction of the cutting tool with the surfaces to be treated. In addition to technological factors, a significant place in providing a quality surface layer is occupied by the correct choice of grinding wheels. The abrasive tool has different properties depending on its characteristics. When choosing an abrasive tool, it is necessary to take into account its characteristics and their suitability for a particular type of work. Stable operation of abrasive wheels depends on the correct choice of their size, characteristics and modes of operation. The selection of grinding wheels depends on the type and properties of machined materials, power of grinding machines, spindle speed, grinding mode, requirements for accuracy and surface cleanliness and other factors that apply to the workpieces. Depending on the accuracy requirements for machining parts made of different materials, the characteristics of abrasive wheels are selected, the main of which are hardness, grain size, bond, structure, shape, size and allowable speed.

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