Leather,which is regularly tanned from whole hides of up to 5 m 2,needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes,furniture and car interiors....Leather,which is regularly tanned from whole hides of up to 5 m 2,needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes,furniture and car interiors.Precise adjustment of the thickness is achieved by shaving.On an industrial scale,rotating knife rollers are used to remove chips from the flesh side of semi-finished leathers whereby adjusting the specified thickness and generating a smooth surface.Care must be taken to prevent the temperature from rising above the denaturation temperature of the leather during shaving in order to avoid any loss of quality.Beside this,temperature rise is always a sign of friction showing avoidable energy expenditure.In order to localize the source of friction during shaving,actual temperature development at the roller knife is studied.Different measuring methods are used to evaluate the temperature increase at the blade roll of the shaving machine.The finite element method is used to thermally simulate the process.Measured temperatures,the geometry of the blade roll and process data are taken into account for modelling the temperature development close to the blade edge.The obtained results enhance the understanding of temperature generating processes during machine operation and allow conclusions about potential improvements in the design of the machine and blades.展开更多
The cutting machine is an important tobacco equipment, in which the sharpening system is an important part of the cutting machine, which is mainly responsible for the real-time grinding of the blades on the cutter rol...The cutting machine is an important tobacco equipment, in which the sharpening system is an important part of the cutting machine, which is mainly responsible for the real-time grinding of the blades on the cutter roller parts of the shredding machine. The quality of the blade grinding is directly related to the size of the cutting force, the cutting edge of tobacco shreds and the breaking rate, etc. Therefore, it is necessary to study the relationship between surface roughness and relevant parameters such as cutter roller speed, grinding wheel reciprocating speed, grinding wheel grinding radius and grinding wheel abrasive grain size.展开更多
基金This work is funded by the German Federal Ministry for Economic Affairs and Energy within the Central Innovation Program for small and medium-sized enterprises.
文摘Leather,which is regularly tanned from whole hides of up to 5 m 2,needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes,furniture and car interiors.Precise adjustment of the thickness is achieved by shaving.On an industrial scale,rotating knife rollers are used to remove chips from the flesh side of semi-finished leathers whereby adjusting the specified thickness and generating a smooth surface.Care must be taken to prevent the temperature from rising above the denaturation temperature of the leather during shaving in order to avoid any loss of quality.Beside this,temperature rise is always a sign of friction showing avoidable energy expenditure.In order to localize the source of friction during shaving,actual temperature development at the roller knife is studied.Different measuring methods are used to evaluate the temperature increase at the blade roll of the shaving machine.The finite element method is used to thermally simulate the process.Measured temperatures,the geometry of the blade roll and process data are taken into account for modelling the temperature development close to the blade edge.The obtained results enhance the understanding of temperature generating processes during machine operation and allow conclusions about potential improvements in the design of the machine and blades.
文摘The cutting machine is an important tobacco equipment, in which the sharpening system is an important part of the cutting machine, which is mainly responsible for the real-time grinding of the blades on the cutter roller parts of the shredding machine. The quality of the blade grinding is directly related to the size of the cutting force, the cutting edge of tobacco shreds and the breaking rate, etc. Therefore, it is necessary to study the relationship between surface roughness and relevant parameters such as cutter roller speed, grinding wheel reciprocating speed, grinding wheel grinding radius and grinding wheel abrasive grain size.
