With concentrated juice of mulberry as raw material, the influence of type and dosage of dry aid, the inlet air tempera- ture, inlet flow rate, and rotating speed on spray drying was studied. The spray drying processi...With concentrated juice of mulberry as raw material, the influence of type and dosage of dry aid, the inlet air tempera- ture, inlet flow rate, and rotating speed on spray drying was studied. The spray drying processing conditions of mulberry pow- der were optimized by the L9 （3^4） orthogonal test on the basis of single factor experiment. The results showed that optimum technical parameters to produce mulberry powder were： lS-cyclodextrin as dry aids with dosage of 30%, inlet air temperature of 180 ℃, rotating speed of 18 000 r/min and inlet flow rate of 30 mL/min. The mulberry powder under this optimum process conditions had a loose structure and bright color, fruity flavor was rich, the anthocyanin content for 54.67 mg/g, moisture content for 5.6% and sensory scores for 83.展开更多
In the optimization of the process of steel valve plate grinding, it is necessary to take into consideration different processing parameters. This paper is going to describe the production of a steel valve plate with ...In the optimization of the process of steel valve plate grinding, it is necessary to take into consideration different processing parameters. This paper is going to describe the production of a steel valve plate with the focus on flat-grinding. It is also going to present the method of choosing grinding wheels and parameters, as well as their impact on the processing quality parameters （roughness, surface flatness and seat width）. The optimization of the grinding process ensures acceptable quality of the final product applying the smallest possible changes in parameters at non-uniform quality levels of the tools. Here we have to make sure that the machining process is acceptable in terms of processing cost as weIl. We are going to use the G-factor as the efficiency indicator for different tools.展开更多
The main objective of the present work was to determine the influence of the most important technological variables of CMTP （cyclical mechanic-thermal processing） on the strain hardening in the surface layers of ste...The main objective of the present work was to determine the influence of the most important technological variables of CMTP （cyclical mechanic-thermal processing） on the strain hardening in the surface layers of steel parts. For this, it was designed a full factorial plan at two levels of five independent variables that include the whole processing in two and three cycles, the cold-forming degree and force during the plastic deformation （burnishing）, and the temperature and time at the given temperature during the aging. Each cycle is composed of plastic deformation at room temperature plus aging. As dependent variables, the degree and penetration depth of strain hardening were evaluated. Based on the appropriately used set of experimental data, it had been fitted an exponential model for each dependent variables and also a two-degree polynomial fitting of in-depth evolution of microhardness profile was obtained. The amount of cycles and the cold-forming degree are the technological variables of CMTP that influence the most on strain hardening, although other variables also are significant. The microhardness profile highlights that during the CMTP, the strain hardening decreases from the outer bound to the transition zone of the surface layers, where it disappears.展开更多
文摘With concentrated juice of mulberry as raw material, the influence of type and dosage of dry aid, the inlet air tempera- ture, inlet flow rate, and rotating speed on spray drying was studied. The spray drying processing conditions of mulberry pow- der were optimized by the L9 （3^4） orthogonal test on the basis of single factor experiment. The results showed that optimum technical parameters to produce mulberry powder were： lS-cyclodextrin as dry aids with dosage of 30%, inlet air temperature of 180 ℃, rotating speed of 18 000 r/min and inlet flow rate of 30 mL/min. The mulberry powder under this optimum process conditions had a loose structure and bright color, fruity flavor was rich, the anthocyanin content for 54.67 mg/g, moisture content for 5.6% and sensory scores for 83.
文摘In the optimization of the process of steel valve plate grinding, it is necessary to take into consideration different processing parameters. This paper is going to describe the production of a steel valve plate with the focus on flat-grinding. It is also going to present the method of choosing grinding wheels and parameters, as well as their impact on the processing quality parameters （roughness, surface flatness and seat width）. The optimization of the grinding process ensures acceptable quality of the final product applying the smallest possible changes in parameters at non-uniform quality levels of the tools. Here we have to make sure that the machining process is acceptable in terms of processing cost as weIl. We are going to use the G-factor as the efficiency indicator for different tools.
文摘The main objective of the present work was to determine the influence of the most important technological variables of CMTP （cyclical mechanic-thermal processing） on the strain hardening in the surface layers of steel parts. For this, it was designed a full factorial plan at two levels of five independent variables that include the whole processing in two and three cycles, the cold-forming degree and force during the plastic deformation （burnishing）, and the temperature and time at the given temperature during the aging. Each cycle is composed of plastic deformation at room temperature plus aging. As dependent variables, the degree and penetration depth of strain hardening were evaluated. Based on the appropriately used set of experimental data, it had been fitted an exponential model for each dependent variables and also a two-degree polynomial fitting of in-depth evolution of microhardness profile was obtained. The amount of cycles and the cold-forming degree are the technological variables of CMTP that influence the most on strain hardening, although other variables also are significant. The microhardness profile highlights that during the CMTP, the strain hardening decreases from the outer bound to the transition zone of the surface layers, where it disappears.
