scholarly journals OPTIMUM WORKHOLDING CONDITIONS FOR PRECISION CYLINDRICAL GRINDING OPERATIONS

10.6036/10160 ◽  
2021 ◽  
Vol 96 (6) ◽  
pp. 627-632
Author(s):  
LEIRE GODINO FERNANDEZ ◽  
JORGE ALVAREZ RUIZ ◽  
JOSU CASAS GAYUBO ◽  
JOSE ANTONIO SANCHEZ GALINDEZ
Keyword(s):  
Critical Issue ◽  
Grinding Process ◽  
Important Process ◽  
Cylindrical Grinding ◽  
Safety Coefficient ◽  
Resistance Torque ◽  
Cylindrical Workpiece ◽  
Grinding Operations ◽  
Non Destructive ◽  
Correct Design

Grinding process is a very important process in machining industry being one of the most popular processes when high quality parts must be manufacture. Likewise, workholding is a critical issue on cylindrical grinding. The use of the driving dog is common when the workpiece is held between centers. However, one of the handicaps of this workholding is that the cylindrical workpiece cannot be ground along the complete length. In order to tackle this issue, in the present work the workpiece is held between centers avoiding the use of the driving dog. To this end, a methodology to obtain the grinding limit parameters that ensure that the transmitted torque is higher that the resistance torque is presented, being the aim of these tests is to avoid the sliding between the point and the workpiece. Finally, non-destructive tests are designed, which, using a safety coefficient of about 0.77, the tests allow the correct design of each specific grinding process. Keywords: cylindrical grinding, workholding, driving dog, sliding

scholarly journals Measuring strain during a cylindrical grinding process using embedded sensors in a workpiece

2017 ◽  
Vol 6 (2) ◽  
pp. 331-340 ◽  
Author(s):  
Mridusmita Sarma ◽  
Florian Borchers ◽  
Gerrit Dumstorff ◽  
Carsten Heinzel ◽  
Walter Lang
Keyword(s):  
High Performance ◽  
Epoxy Adhesive ◽  
Embedded Sensors ◽  
Manufacturing Processes ◽  
Outer Diameter ◽  
Grinding Process ◽  
Cylindrical Grinding ◽  
Cylindrical Workpiece ◽  
Grinding Machine

Abstract. This paper presents the results of using a sensor-integrated workpiece for in situ measurement of strain during an outer-diameter cylindrical grinding process. The motivation of this work is to measure in situ process parameters using integrated sensors in a workpiece in order to characterize the manufacturing process. Resistive sensors that operate on the same principle as conventional strain gauges were fabricated on wafers made of steel using standard microtechnology and later the wafers were diced to form unique sensor-integrated steel components (sensor inlays). These inlays are embedded into a groove on the top surface of a cylindrical workpiece using epoxy adhesive. The workpiece is also made of the same steel as the sensor wafers and has similar properties due to a heat treatment process, thereby maintaining the homogeneity of the material over the whole contact area. The sensor-integrated workpiece was used to perform experiments in a Studer S41 high-performance cylindrical grinding machine. The sensor response to the internal strain was recorded during every grinding step starting from a depth of 1 mm down to 2 mm from the top surface. Such an application of sensor integration in materials for in situ process monitoring can be used in other manufacturing processes as well and this can help to observe internal loads (mechanical or thermal) in manufacturing processes.

Study on Edge Contact Area and Surface Integrity of Workpiece in Point Grinding Process

2009 ◽  
Vol 407-408 ◽  
pp. 577-581
Author(s):  
Shi Chao Xiu ◽  
Zhi Jie Geng ◽  
Guang Qi Cai
Keyword(s):  
Surface Integrity ◽  
Contact Area ◽  
High Speed ◽  
Ground Surface ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Edge Contact ◽  
Cylindrical Grinding ◽  
Theoretic Foundations

During cylindrical grinding process, the geometric configuration and size of the edge contact area between the grinding wheel and workpiece have the heavy effects on the workpiece surface integrity. In consideration of the differences between the point grinding and the conventional high speed cylindrical grinding, the geometric and mathematic models of the edge contact area in point grinding were established. Based on the models, the numerical simulation for the edge contact area was performed. By means of the point grinding experiment, the effect mechanism of the edge contact area on the ground surface integrity was investigated. These will offer the applied theoretic foundations for optimizing the point grinding angles, depth of cut, wheel and workpiece speed, geometrical configuration and size of CBN wheel and some other grinding parameters in point grinding process.

A Computer Program Design for Optimization of a Cylindrical Traverse Grinding Operations

2009 ◽  
Vol 147-149 ◽  
pp. 387-392
Author(s):  
Andrejus Henrikas Marcinkevičius
Keyword(s):  
Computer Program ◽  
Program Design ◽  
Task Complexity ◽  
Process Plan ◽  
Cylindrical Grinding ◽  
Grinding Operations ◽  
Manual Calculation ◽  
Traverse Grinding

Traverse cylindrical grinding productivity and accuracy depend on many factors of rough, fine and spark out grinding. Evaluation of all these factors at manual calculation of the process plan is impossible, for that reason the engineer technologist selects the cutting rates approximately, and they are far from optimal. We have deduced equations for calculation of optimal cutting rates for that purpose. Because of task complexity the computer program was designed for calculations which is described in this paper.

Recycling Oriented Fasteners: A Critical Evaluation of VDI 2243’s Selection Table

1994 ◽  
Author(s):  
Zachary VerGow ◽  
Bert Bras
Keyword(s):  
Critical Evaluation ◽  
Critical Issue ◽  
Environmentally Benign ◽  
Material Recycling ◽  
Life Cycle Design ◽  
German Standard ◽  
Product Recycling ◽  
Technical Products ◽  
Non Destructive ◽  
Selection Of

Abstract A growing concern about the environment, and especially about waste and landfill, has spurred research into the design of more environmentally benign products. A dramatic reduction in environmental impact can be made by recycling. A critical issue in recycling is the separation of joints in the disassembly process. In product recycling (also referred to as reuse) non-destructive disassembly is desired, whereas in material recycling destructive disassembly is allowed (e.g., shredding). This has an impact on the selection of fasteners. In this paper, we provide an overview of the issues involved and specifically we evaluate the selection of fasteners in the context of product recycling, material recycling, and technical aspects as documented in the new German standard VDI 2243, “Designing Technical Products for Ease of Recycling – Fundamentals and Rules for Design”. The results of this evaluation provide insight in future areas of research and fastener selection models for life cycle design.

scholarly journals Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2506
Author(s):  
Seweryn Kieraś ◽  
Marek Jakubowski ◽  
Krzysztof Nadolny
Keyword(s):  
Coolant Flow ◽  
Grinding Wheel ◽  
Geometrical Parameters ◽  
Grinding Process ◽  
Simulation Studies ◽  
Cylindrical Grinding ◽  
Supply Line ◽  
Air Gun ◽  
Internal Cylindrical Grinding ◽  
Cooling And Lubrication

This paper describes simulation studies regarding the application of the centrifugal minimum quantity lubrication (MQL) method simultaneously with the delivery of a compressed cooled air (CCA) stream in the internal cylindrical grinding process. The idea of a new hybrid cooling and lubrication method connecting centrifugal (through a grinding wheel) lubrication by MQL with a CCA stream is described. The methodology of computational fluid dynamics (CFD) simulation studies, as well as the results of numerical simulations, are presented in detail. The aim of the simulations was to determine the most favourable geometrical and kinematic parameters of the system in the context of air-oil aerosol and CCA flow, as well as heat exchange. In the simulation, the variables were the grinding arbor geometrical parameters, the angle of CCA supply line outlets, and the grinding wheel and workpiece peripheral speed. As a result of the simulation studies, the most favourable geometrical parameters were designated, determining the orientation of the ends of the two CCA supply line outlets before and after the grinding zone, the number of openings in the drilled-out grinding arbor, and the influence of the grinding speed on the parameters of the coolant flow and temperature of objects in the grinding zone. In addition, the results of simulation tests made it possible to visualise the velocity vectors of the two-phase coolant flow in a complex system of air-oil aerosol delivery centrifugally through an open structure of a very fast rotating porous layer (grinding wheel), with an additional supply of CCA using an external cold air gun (CAG).

A study on the vibrations in the external cylindrical grinding process of the alloy steels

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040150 ◽  
Author(s):  
Tuan-Linh Nguyen ◽  
Nhu-Tung Nguyen ◽  
Long Hoang
Keyword(s):  
Grinding Process ◽  
Cooling Mode ◽  
Workpiece Material ◽  
Cylindrical Grinding ◽  
Technology System ◽  
Machining Conditions ◽  
Material Hardness ◽  
Alloy Steels ◽  
External Cylindrical Grinding

The vibration during external cylindrical grinding is caused by many factors such as the rigidity of the technology system, machining modes, machining materials, cooling mode, etc. This paper employed a Taguchi method to design experiments and evaluate the influence of machining mode parameters and workpiece material hardness on the vibrations when machining some types of alloy steel in external cylindrical grinding process. The influence of machining conditions on the vibrations was investigated. Besides, the mathematical models of vibration amplitudes were also modeled. The achieved results can be used to control the vibrations through machining conditions to improve the surface quality of the product.

Optimization and Application of Laser-Dressed cBN Grinding Wheels

2016 ◽  
Vol 1136 ◽  
pp. 90-96 ◽  
Author(s):  
Ali Zahedi ◽  
Bahman Azarhoushang ◽  
Javad Akbari
Keyword(s):  
Environmental Concerns ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Average Roughness ◽  
Cylindrical Grinding ◽  
Laser Dressing ◽  
Dressing Tool ◽  
Cbn Grinding Wheel ◽  
Spindle Power

Laser-dressing has been shown to be a promising method for overcoming some shortcomings of the conventional methods such as high wear of the dressing tool and its environmental concerns, high induced damage to the grinding wheel, low form flexibility and low speed. In this study, a resin bonded cBN grinding wheel has been dressed with a picosecond Yb:YAG laser. The efficiency of the laser-dressed grinding wheels has been compared with the conventionally dressed and sharpened grinding wheels through execution of cylindrical grinding tests on a steel workpiece (100Cr6). The conventional dressing and sharpening processes have been performed by using a vitrified SiC wheel and vitrified alumina blocks, respectively. By recording the spindle power values along with the surface topography measurements of the ground workpieces and the extraction of two roughness parameters (the average roughness Ra and the average roughness depth Rz), it is possible to provide an assessment of the cylindrical grinding process with different dressing conditions i.e. laser-dressing and conventional dressing. Accordingly, a strategy will be proposed to optimize the cylindrical grinding process with laser-dressed wheels regarding the forces and roughness values.

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