Influence of Grinding Parameters and Chamfer Size on the Grinding-Hardened Layer'S Depth

Based on the orthogonal experiment, this paper studied the combined effect of grinding parameters and chamfer size on grinding-hardened layers depth formed in grinding-hardening machine. The results show that, while the workpiece was chamfered, the grinding-hardened layers depth would lessen owing to the decreasing of metal removal in per unit time. On this experimental condition, the effect orders of grinding parameters and chamfer size on the average value of grinding-hardened layers depth are as follow, grinding parametersavchamfer degree α and chamfer heighth. In actual application, it should adopt suitable combinations of grinding parameters and chamfer size according to the requirements of the grinding-hardened layers depth to minimize the burrs size and maximize the productivity of grinding-hardening machine.

Download Full-text

Orthogonal Experimental Study on the Grinding-Hardened Layer’s Depth and its Uniformity of 45 Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.668.898 ◽

2013 ◽

Vol 668 ◽

pp. 898-901 ◽

Cited By ~ 2

Author(s):

Wei Yuan ◽

Ju Dong Liu ◽

Zhi Long Xu

Keyword(s):

Orthogonal Experiment ◽

Hardened Layer ◽

Depth Of Cut ◽

Average Value ◽

Actual Application ◽

Grinding Method ◽

Grinding Conditions ◽

Grinding Hardening ◽

Table Speed

Based on the orthogonal experiment of grinding-hardening machine, this paper studied the influence of depth of cut ap, table speed vw and grinding method gm on the grinding-hardened layer’s depth and its uniformity of 45 steel. The results show that, depth of cut ap is the significant factor affected the average value of grinding-hardened layer’s depth, but the influence of grinding conditions on the uniformity are very limited. In actual application, it should adopt ap=0.6mm, vw=0.4m/min and up-down grinding method to enhance the quality of grinding-hardened layer.

Download Full-text

Study on the Two-Side Direction Burr in Grinding-Hardening Machine Based on Orthogonal Experimental Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.217-219.1869 ◽

2012 ◽

Vol 217-219 ◽

pp. 1869-1873 ◽

Cited By ~ 2

Author(s):

Ju Dong Liu ◽

Wei Yuan ◽

Jin Kui Xiong ◽

Zhi Long Xu ◽

Song Wei Huang

Keyword(s):

Coupling Effect ◽

Orthogonal Experiment ◽

Depth Of Cut ◽

Actual Application ◽

Grinding Method ◽

Force Coupling ◽

Grinding Hardening ◽

Table Speed ◽

Significant Factors

Based on the orthogonal experiment, this paper studied the influences of depth of cut ap, table speed vw and grinding method gm on the two-side direction burr in grinding-hardening machine. The results show that, with thermal-force coupling effect induced in the grinding-hardening machine, the metal in the workpiece’s surface flowed to two-side direction of the workpiece that without any constraint and leaded to the burr’s formation. The depth of cut ap and grinding method gm are significant factors that affected the size of two-side direction burr, and the significant order are as follows: depth of cut ap> grinding method gm > table speed vw>interaction av. With the increasing of depth of cut ap or the grinding trip, the max size of the two-side direction burr increased gradually; and with the raising of table speed vw, the max size decreased firstly and then increased. In actual application, it should adopted the grinding parameters ap＝0.2mm，vw＝0.6m/min and up-down grinding to improve the quality of grinding-hardening and reduce the size of the burr.

Download Full-text

Influence of Grinding Parameters on the Depth and Uniformity of Cylindrical Grinding-Hardened Layer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.102-104.733 ◽

2010 ◽

Vol 102-104 ◽

pp. 733-737

Author(s):

Ju Dong Liu ◽

Jie Zhen Zhuang ◽

Xi Lin Zhang ◽

Zhi Long Xu

Keyword(s):

Hardened Layer ◽

Depth Of Cut ◽

Grinding Wheel ◽

Feed Speed ◽

Practical Application ◽

Cylindrical Grinding ◽

Grinding Parameters ◽

Grinding Hardening ◽

Surface Hardened Layer

On the basis of the cylindrical grinding-hardening test, the influences of the grinding parameters on surface hardened layer were studied. The result shows that when ap≤0.2mm, there is an unhardened area exist in cylindrical grinding hardened workpiece. When ap＞0.2mm, there is a tempered area exist in cylindrical grinding hardened workpiece due to the action of grinding heat during cut-in and cut-out of grinding wheel. When depth of cut increases, or feed speed decreases, the hardened layer depth increases accordingly. In the practical application, the satisfactory quality of the cylindrical grinding hardened layer can be obtained through reasonable combination of ap and vw.

Download Full-text

Optimization of Architectural Form for Thermal Comfort in Naturally Ventilated Gymnasium at Hot and Humid Climate by Orthogonal Experiment

Energies ◽

10.3390/en14113228 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3228

Author(s):

Xiaodan Huang ◽

Qingyuan Zhang ◽

Ineko Tanaka

Keyword(s):

Thermal Comfort ◽

Thermal Sensation ◽

Orthogonal Experiment ◽

Range Analysis ◽

Humid Climate ◽

Architectural Form ◽

Healthy Environment ◽

Average Value ◽

Indoor Thermal Comfort ◽

Hot And Humid Climate

As the gymnasiums in subtropical region with hot and humid climate are naturally ventilated during non-competition periods, occupants exercising indoors often feel uncomfortable, especially in summer. In order to provide thermally comfortable and healthy environment for the occupants, the design on architectural form is found to be an effective solution on improving indoor thermal comfort of naturally ventilated gymnasiums. Therefore, a new perspective regarding optimization of naturally ventilated gymnasiums is proposed in the aspect of the architectural form. This paper presents the optimization of architectural form in naturally ventilated gymnasiums in which simulation and orthogonal experiment methods are combined. Through numerical simulation with FlowDesigner software, the significance of architectural form affecting indoor thermal comfort has been given, and the optimal architectural forms of naturally ventilated gymnasium are determined. The results show that the roof insulation type is the most significant factor influencing indoor thermal comfort; thus, it should be considered primarily in optimization. Moreover, the range analysis and variance analysis reveal the rankings of the factors for the gymnasium thermal comfort. In addition, it is demonstrated that the optimal gymnasium model, when compared with the initial gymnasium model, has a satisfactory effect on improving the indoor thermal comfort, as the average value of Predicted Thermal Sensation (PTS) in August decreased from 1.11 (Slightly hot) to 0.86 (Comfortable). This study provides a new insight for the designers in optimizing the architectural form of gymnasiums for achieving the indoor thermal comfort at hot and humid climate.

Download Full-text

Process Parameters Optimization of Wet Shot Peening for Paint Cleaning

Sustainability ◽

10.3390/su132212915 ◽

2021 ◽

Vol 13 (22) ◽

pp. 12915

Author(s):

Shuangshuang Wu ◽

Xiujie Jia ◽

Sheng Xiong ◽

Fangyi Li ◽

Mingliang Ma ◽

...

Keyword(s):

Process Parameters ◽

Shot Peening ◽

High Efficiency ◽

Orthogonal Experiment ◽

Development Trend ◽

Parameters Optimization ◽

Cleaning Efficiency ◽

Substrate Removal ◽

Actual Application ◽

Cleaning Technology

Wet shot peening (WSP) cleaning technology has the advantages of being green, having a high efficiency, and producing almost no pollution to the environment. Under the development trend of green environmental protection, WSP is more and more desired by the public. However, in the study of WSP cleaning paint, there is little research on process parameter optimization. Accordingly, this article uses an orthogonal experiment, taking the cleaning efficiency and the substrate removal mass as objectives, to optimize the parameters of pressure, stand-off distance, traverse rate, and cleaning times. The experimental results show that the cleaning efficiency is improved by increasing the pressure, stand-off distance, and traverse rate or decreasing the cleaning times within the scope of this experiment. The pressure and cleaning times are positively correlated with the substrate removal mass, whereas the traverse rate is negatively correlated. As the stand-off distance increases, the substrate removal mass initially increases and then decreases. The traverse rate has a significant influence on the cleaning efficiency and the substrate removal mass. The optimal process parameters based on the cleaning efficiency are 0.45 MPa pressure, 140 mm stand-off distance, 5 mm/s traverse rate, and one-time cleaning. Besides, the cleaning efficiency at such conditions is 64.23 %/min. Additionally, the substrate removal mass is optimized under 0.25 MPa pressure, 60 mm (or 140 mm) stand-off distance, 5 mm/s traverse rate, and one-time cleaning to give a substrate removal mass of approximately zero. The analysis of parameters provides a reference for selecting the parameters in the actual application of WSP cleaning.

Download Full-text

Influence of Chamfer Size on the Two-Side Direction Burr Formed in Grinding-Hardening Machine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.645.392 ◽

2013 ◽

Vol 645 ◽

pp. 392-395 ◽

Cited By ~ 1

Author(s):

Ju Dong Liu ◽

Wei Yuan ◽

Jin Kui Xiong ◽

Zhi Long Xu

Keyword(s):

Orthogonal Experiment ◽

Grinding Hardening

Based on the orthogonal experiment, this paper studied the influences of chamfer size on the two-side direction burr in grinding-hardening machine. The results show that: chamfer height size affected the two-side direction burr’s size significantly and the influence of chamfer degree α is general. On this experimental condition, it should adopted grinding parameter ap＝0.2mm,vw＝0.2m/min, the chamfer height h=1.0mm and chamfer degree α=20 o to reduce the two-side direction burr’s size effectively and decrease the workload of removing burr.

Download Full-text

Influence of Workpiece's Size on the Structure and Performance of Grinding-Hardened Layer

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.579-580.56 ◽

2013 ◽

Vol 579-580 ◽

pp. 56-60 ◽

Cited By ~ 1

Author(s):

Ju Dong Liu ◽

Wei Yuan ◽

Meng Chen

Keyword(s):

Hardened Layer ◽

Substantial Influence ◽

Micro Hardness ◽

Average Value ◽

Hardened Zone ◽

Saddle Type ◽

And Performance ◽

Grinding Hardening

Based on the experiment of two-way plane grinding-hardening machine, this paper studied the influence of workpieces height size and grinding parameter on the microstructure, micro-hardness and hardening depth of grinding-hardened layer. The results show that under this experimental condition, workpieces height size has no substantial influence on grinding-hardening, but while the height size increased, the micro-hardness and hardening depths average value of completely hardened zone presents trend of "saddle type". The workpieces quality of grinding-hardening can be improved by adopting reasonable workpieces height size.

Download Full-text