Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Advances in Science and Technology. Research Journal

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Shaping the Topography of the Active Surface of a Ceramic Grinding Wheel with a Stationary Multi-Point Diamond Dresser

Dębkowski Ryszard, Gołąbczak Marcin

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 2

266--283

The paper presents issues related to shaping the topography of the grinding wheel as a result of the impact of a stationary multipoint diamond dresser. The result of the dressing process with diamond multipoint dressers is influenced by the dressing feed, the effective width of the individual diamonds and the distance between the diamonds measured along the dressing feed direction. The paper presents simulation results the influence of these parameters on the multiplicity of contact between generatrix of the flat grinding wheel type 1 and the dressing diamonds. The results of the simulation showed that, depending on these parameters, areas with no contact with diamonds and areas with different multiplicity of contact may form on the surface of the grinding wheel. This means that the active surface roughness of the grinding wheel may not be uniform. Two indexes were proposed to enable supervision of the dressing process using stationary multi-point dressers. The first index (k1) characterizes the average multiplicity of contact between the diamonds and the grinding wheel along its generatrix, and the second (k2) the possibility of forming a spiral ridge on the grinding wheel surface due to the lack of contact between this part of the grinding wheel and the diamonds. The work analyzes the changes in the indexes values as a function of the dressing feed rate and the active width of diamonds for two basic types of diamond distribution on the working surface of the dresser, i.e. uniform and irregular spacing. The study presented the results of evaluating the topography of the flat aluminum oxide vitrified grinding wheel type 1 subjected to dressing with various values of indices k1 and k2. The assessment was carried out on the basis two-sample Kolmogorov-Smirnov test and statistical analysis of parameters for evaluating the microgeometry of the grinding wheel circumferential profile, i.e. the depth of active cutting edges and the undeformed chips thickness. The analysis confirmed the lack of homogeneity of the surface topography of the grinding wheel formed with a stationary multipoint dresser and the purposefulness of using the k1 and k2 indexes.

Evaluation of the Influence of the Cooling Method Used During Grinding on the Operating Properties of Ceramic Grinding Wheels Made with Different Abrasives

Stachurski Wojciech, Dębkowski Ryszard, Rosik Radosław, Święcik Robert, Pawłowski Witold

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 3

1--18

This article presents the results of a study of the performance characteristics of ceramic grinding wheels during peripheral grinding of flat surfaces carried out using different methods of supplying cooling and lubricating fluid (coolant). In the study, T1 type grinding wheels were used, differing in the type of abrasive used in their construction. The abrasive consisted of mixtures with different volume percentages of: 1) grains of conventional white electro-corundum, 2) grains of submicrocrystalline sintered corundum produced by sol-gel technology, 3) microcrystalline sintered ceramic grains with RECERAMAX™ RT microclasters from RECKEL. Specimens made of 145Cr6 tool steel (60±1 HRC) were ground using coolant feeding by flood method and MQL (Minimum Quantity Lubrication) method. During the study, the components of grinding force (Fn, Ft), radial loss of the grinding wheel and roughness of the ground surface were measured, which made it possible to determine the volumetric wear of the grinding wheel Vs, the total grinding power P, and then calculate the grinding indicators G and Ks. The obtained values of the G index indicate that, regardless of the type of grinding wheel used, a higher relative grinding efficiency was obtained during grinding with the delivery of coolant by the MQL method. The highest values of this index were obtained in the case of the grinding process carried out with a grinding wheel containing RECERAMAX™ RT abrasive. The Ks index confirmed the best performance of the mentioned grinding wheel. Since its value also depends on the total grinding power P and the surface roughness parameter Ra, the grinding process carried out with this grinding wheel is additionally characterized by a better quality of the obtained surface and lower energy consumption.