Influence of grinding parameters on surface temperature and burn behaviors of grinding rail

Jiang

et al. 2020

Mater. Res. Express

In this paper, seven copper-zirconia toughened alumina (Cu-ZTA) cermets were prepared by vacuum hot pressing sintering (VHP). The effects of different binder content and different particle size of ZTA particles on the mechanical properties of Cu-ZTA cermets were investigated. The microstructure of the composites was studied by x-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The hardness of the material was measured by micro Vickers hardness tester. The results show that the solid solution strengthening occurs in the hot pressing sintering process, the formation of copper-based solid solution increases the hardness of the matrix, the highest is192.04 HV 0.1 . The ZTA particles are uniformly distributed in the matrix, and the surface of the ZTA particles is surrounded by a continuous coppermatrix and second phase. Two interfaces are formed between ZTA particles and Cu matrix. One is the ZTA/Cu interface formed by the substitution of Cu atoms for Ni atoms, it is a mechanical meshing interface which extends the service life of cermet under mechanical stress and thermal stress. The other interface is the reaction bonding interface of Cu 3 Ti 3 O and TiO x . The friction and wear test results show that the use of low-diameter ZTA particles and increasing the content of Cu binder will improve the friction and wear properties of Cu-ZTAcermet. Under the action of stress, the fracture occurs at the interface of Cu/ZTA, and the wear, fracture and extraction of ZTA ceramics cause the failure of Cu-ZTA cermet.

Section: Grinding Behavior Of Cu-zta Cermetsmentioning

confidence: 99%

Microstructure and mechanical properties of Cu-ZTA cermet prepared by vacuum hot pressing sintering

Jiang

et al. 2020

Mater. Res. Express

“…Therefore, the mechanical grinding path planning is of great significance. Before the mechanical grinding path planning, the following basic concepts related to the tool path need to be clarified [15]: -Grinding point curve: Refers to the curve formed by the grinding point during the machining process. Grinding point curves are the basic elements of generating tool trajectories, either explicitly defined on the surface of the workpiece or implicitly defined to meet certain conditions.…”

Section: Path Planningmentioning

confidence: 99%

Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

2020

THERM SCI

Aiming at the shortcomings of traditional elliptic contour grinding methods, such as large grinding roughness and poor contour accuracy, a multi-axis mechanical grinding method based on algebraic geometry is proposed. This method studies the first attempt of elliptic contour. The process includes selecting suitable multi-axis grinding tools and selecting appropriate grinding methods according to grinding process. Using specific workpieces, grinding path planning, motion attitude determination and error compensation based on algebraic geometry for multi-axis mechanical grinding are carried out. The results show that compared with the traditional grinding method, the device has the smallest surface roughness, the contour radian is closer to the expected results, and has higher performance, which solves the grinding defects.

“…It changes the surface hardness and reduces the fatigue resistance which brings great damage to work-piece [1,2]. Grinding burn is widespread in the field of cylindrical grinding, rail grinding, bearing rings grinding, and so on [3][4][5]. Therefore, the detection and monitoring of grinding burn is of great importance to guarantee the high quality of mechanical components.…”

Section: Introductionmentioning

confidence: 99%

Grinding Burn Detection Based on Cross Wavelet and Wavelet Coherence Analysis by Acoustic Emission Signal

Gao

Lin

Wang

et al. 2019

Chin. J. Mech. Eng.

Grinding burn monitoring is of great importance to guarantee the surface integrity of the workpiece. Existing methods monitor overall signal variation. However, the signals produced by metal burn are always weak. Therefore, the detection rate of grinding burn still needs to be improved. The paper presents a novel grinding burn detection method basing on acoustic emission (AE) signals. It is achieved by establishing the coherence relationship of pure metal burn and grinding burn signals. Firstly, laser and grinding experiments were carried out to produce pure metal burn signals and grinding burn signals. No-burn and burn surfaces were generated and AE signals were captured separately. Then, the cross wavelet transform (XWT) and wavelet coherence (WTC) were applied to reveal the coherence relationship of the pure metal burn signal and grinding burn signal. The methods can reduce unwanted AE sources and background noise. Novel parameters based on XWT and WTC are proposed to quantify the degree of coherence and monitor the grinding burn. The grinding burn signals were recognized successfully by the proposed indexes under same grinding condition. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.