Grinding System Reducing the Influence of Thermal Deformation of Workpiece in Cylindrical Grinding

2013 ◽  
Vol 797 ◽  
pp. 609-612 ◽  
Author(s):  
Takashi Onishi ◽  
Moriaki Sakakura ◽  
Naoki Sato ◽  
Takuya Kodani ◽  
Kazuhito Ohashi ◽  
...  
Keyword(s):  
Thermal Deformation ◽  
Grinding Process ◽  
Dimensional Error ◽  
Cylindrical Grinding ◽  
Grinding Machine ◽  
Stock Removal ◽  
Grinding System

In cylindrical grinding, a sizing device is generally used to obtain the required dimension. However, the dimensional error can be caused by the thermal deformation of the workpiece even if grinding machine is controlled with the sizing device. To solve this problem, it is necessary to develop the grinding system that can consider the thermal deformation of the workpiece during grinding process. In this study, an advanced grinding system was developed, which can predict the net stock removal of ground workpiece immediately. The grinding experiment is carried out to verify the developed system.

scholarly journals Producing Optimum Quality Grinding Spindle using Hardened AISI 4340 Steel through a Cylindrical Grinding Process

2019 ◽  
Vol 9 (2) ◽  
pp. 447-454
Keyword(s):  
Surface Roughness ◽  
Grinding Process ◽  
Rough Machining ◽  
Aisi 4340 Steel ◽  
Cylindrical Grinding ◽  
4340 Steel ◽  
Grinding Machine ◽  
Experimental Runs ◽  
The Ideal ◽  
Aisi 4340

The intent of this study is to produce optimum quality grinding spindle using hardened AISI 4340 steel through the cylindrical grinding process. Primarily the AISI 4340 steel specimens are cut according to the product specification and subjected to rough machining. Then the steel specimens are subjected to a heat-treatment process to enhance the mechanical property hardness so that the specimen becomes wear-resistant. The experimental runs are planned depending on Taguchi’s L27(37) array and conducted in a cylindrical grinding machine (Toyoda G32 cylindrical grinding machine). The surface roughness of the machined specimens is measured using a calibrated surface roughness tester. A prediction model is created through regression analysis for the outcome. The significance of the selected grinding factors and their levels on surface roughness is found by analysis of variance (ANOVA) and F-test and finally. An affirmation test is directed to produce the ideal components.

Development of intelligent cylindrical grinding system considering thermal deformation of workpiece

2017 ◽  
Vol 2017.9 (0) ◽  
pp. 143 ◽  
Author(s):  
Takashi Onishi ◽  
Moriaki Sakakura ◽  
Takuo Okanoue ◽  
Yasuhiro Fujiyama ◽  
Kazuhito Ohashi
Keyword(s):  
Thermal Deformation ◽  
Cylindrical Grinding ◽  
Grinding System

Thermal Deformation Analysis of an Orbital Grinding System Grinding Process

2016 ◽  
Vol 33 (7) ◽  
pp. 595-600 ◽  
Author(s):  
Hyeon Min Lee ◽  
Woo Chun Choi ◽  
Chang Rae Cho ◽  
Soon Ju Cho
Keyword(s):  
Thermal Deformation ◽  
Deformation Analysis ◽  
Grinding Process ◽  
Grinding System

scholarly journals The Design of an Infeed Cylindrical Grinding Cycle

Inventions ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 46 ◽  
Author(s):  
Fukuo Hashimoto
Keyword(s):  
Process Parameters ◽  
Removal Rate ◽  
Block Diagram ◽  
Critical Factor ◽  
Total System ◽  
Cylindrical Grinding ◽  
Grinding Mechanism ◽  
Centerless Grinding ◽  
Grinding Machine ◽  
Grinding System

This paper synthesizes the design of an infeed cylindrical grinding system into a total system composed of the grinding mechanism and the grinding machine characteristics. The causalities between the grinding parameters and the machine structures are discussed, and the infeed grinding processes are analyzed as outputs that represent responses to the inputs. These relationships are integrated into a block diagram with closed-loop feedback. A novel model exhibiting practical parameters such as grinding speed, infeed rate and MRR (Material Removal Rate) is proposed. The analysis of the grinding system derived a critical factor, the “grinding time contact,” which governs the transient behaviors of process parameters such as forces and machine deflection. The process parameters during the infeed cycle including spark-out grinding were investigated, and the formulas required for the cycle design are presented. Furthermore, to improve accuracy and productivity, the features of the cycle design are described and procedures for controlling size error and roundness are discussed. Finally, the model was verified with infeed grinding tests applied to both the chuck-type cylindrical and centerless grinding methods.

scholarly journals The Effects of Cylindrical Grinding Factors in the Production of Grinding Spindle using Hardened EN353 Steel

2019 ◽  
Vol 8 (4) ◽  
pp. 10640-10649
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Treatment Process ◽  
Grinding Process ◽  
Heat Treatment Process ◽  
Rough Machining ◽  
Cylindrical Grinding ◽  
Grinding Machine ◽  
Experimental Runs ◽  
Product Specification

The objective of this study is to produce the best possible grinding spindle using hardened EN 353 steel through the cylindrical grinding process. Primarily the EN 353 steel specimens are cut according to the product specification and subjected to rough machining. Then the steel specimens are subjected to a heat-treatment process to enhance the mechanical property hardness so that the specimen becomes wear-resistant. The experimental runs are planned based on Taguchi’s L27(37 ) array and conducted in a cylindrical grinding machine (Toyoda G32 cylindrical grinding machine). The surface roughness of the machined specimens is measured using a calibrated surface roughness tester. A prediction model is created through regression analysis for the outcome. The significance of the selected grinding factors and their levels on surface roughness is found by analysis of variance (ANOVA) and F-test and finally, a affirmation test is conducted to confirm the optimum factors.

Estimation of the Grinding Time by Means of the Grinding Process Model

2012 ◽  
Vol 565 ◽  
pp. 52-57 ◽  
Author(s):  
Takazo Yamada ◽  
Hwa Soo Lee ◽  
Kohichi Miura
Keyword(s):  
Process Model ◽  
The Other ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Elastic Deformations ◽  
Residual Stock ◽  
Grinding Machine ◽  
Stock Removal ◽  
Grinding Time

In grinding operation, elastic deformations of the grinding machine and the grinding wheel induce a residual stock removal of workpiece. On the other hand, thermal expansions of the workpiece and the grinding wheel increase the depth of cut. Therefore, calculation of a ground depth of cut and/or the grinding time has to be considered by the elastic deformations and the thermal expansions. From such a viewpoint, in this study, grinding process model taking into account the elastic deformations and the thermal expansions was proposed. This paper aims to estimate the grinding time by means of the proposed grinding process model.

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.

scholarly journals Modeling and experimental analysis of wheel-work interface in the cylindrical plunge grinding process

2014 ◽  
Vol 3 (4) ◽  
pp. 484
Author(s):  
Tarik Tawfeek
Keyword(s):  
Contact Stiffness ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Plunge Grinding ◽  
Workpiece Surface ◽  
Roundness Error ◽  
Cylindrical Grinding ◽  
Grinding Processes ◽  
Proposed Model ◽  
Grinding Machine

This paper presents a study of grinding wheel-workpiece interference in external cylindrical plunge grinding processes. This is to study the effect of workpiece surface memory on the workpiece roundness error after grinding. The study has been carried out theoretically on a model simulating cylindrical grinding process. The model takes contact stiffness, grinding wheel and workpiece wear into consideration. The proposed model was sued to predict the normal grinding forces in cylindrical grinding as a function of the previous height and number of waves of the initial profile.The new model has been validated by conducting experiments on a cylindrical grinding machine. Results indicate that the proposed model shows a good agreement with the experimental data obtained.The results of experiments indicate that the proposed modeling method is both feasible and reliable. The results showed that the theoretical model was effective studying the output of cylindrical grinding process. Normal grinding force, vibration level, and roundness error in cylindrical plunge grinding processes are dependent on the workpiece surface memory. Keywords: Plunge Grinding, Modeling, Roundness Error, Surface Memory.

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