| 摘要 |
PURPOSE: A method for manufacturing sheave and pulley for hoist is provided to increase production efficiency by adopting hot forming rolling, that is, spin rolling, and obtain high quality products by improving mechanical properties of a finished product. CONSTITUTION: The method for manufacturing sheave and pulley for hoist comprises the processes of inserting a material for manufacturing sheave and pulley into a hole formed on a rotational surface plate installed on the upper part of a driving spindle shaft(10) instead of a spin rolling equipment, that is, a hot forming rolling equipment; installing a high frequency heating coil at heating positions of a sheave material(30) in such a manner that an A-type high frequency heating device for preheating inner diameter of the sheave material and a B-type high frequency heating device for preheating the outer circumferential surface of the sheave material are installed at the heating positions, wherein the preheating temperature simultaneously heated is ranging from 300 to 1200 deg.C; moving downward a fixed spindle shaft on the upper part of the spindle shaft to clamp the sheave material(30) after the preheating process, thereby closely adhering the top surface of the sheave material(30) by a set pressure; completing set-up of working tools by controlling sequence circuits of an oil pressure gauge as a jig transfer function for determining processing positions of a guide roller(51) and a cam roller in the state that clamping is completed; proceeding pressing process of tool row numbers 1, 2, 3 and 4(60) of a form roller tool set in the state that set-up of the guide roller(51) and cam roller is completed, thereby forming grooves having respective shapes of the row numbers 1, 2, 3 and 4(60) of the form roller tool set on the outer circumferential surface of the sheave or pulley; and producing a final product in hot rolling pressing method using metal and nonmetal after the cam roller set-up in the inner diameter of the sheave or pulley receives power from a cam roller driving shaft so as to apply outer pressure onto the circumferential surface of the inner diameter of the roller sheave.
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