Research of Technological Process Operations for Manufacturing Shredder Knives on Screw Spirals

Screw working bodies with shredder knives and blade elements have been used in various industries, such as construction, food and processing, mining and agriculture. The advantages of such screws are the combination of the movement of agricultural and other materials with various technological operations of their processing, in particular, crushing and mixing. Such augers are widely used in the production of materials, compound feeds and other agricultural feeds for feeding animals and poultry, when mixing loose materials and grinding root crops. Therefore, technological support for the manufacture of shredder knives on screw spirals in medium-volume production is an important task. The purpose of the work is experimental research and practical implementation of the operations of the technological process of manufacturing shredder knives on screw spirals. The research and practical implementation of the main operations of the technological process of manufacturing shredder knives on screw spirals are presented, including grinding and sharpening the outer edge of the screw spiral, cutting the outer edge of the screw spiral to obtain blanks for shredder knives, and bending them. To perform the above operations, special technological equipment and tools were designed and manufactured. A special mandrel was designed and manufactured for clamping, basing and machining the screw spiral, a special tool for sharpening the screw edge and a roller for bending the knives of the shredders. Experimental studies were conducted to determine the patterns of the relationship between the design parameters of the knives of screw crushers, in particular the angle of bending of the screw sector, the angular value of the segment sector, the thickness of the screw material with the bending force of the screw segment. Statistical processing of experimental research results was carried out to obtain regression equations in coded and natural values of the dependence of the bending force of the screw segment on its constructive independent variable parameters, as well as checking the adequacy of the obtained equations using application software. The maximum value of the bending force of the screw segment was 1484 N, and the minimum was 496 N. An increase in the bending angle of the screw sector from 40 degrees to 80 degrees leads to an increase in the bending force of the screw segment by 1.26 times.