旋转拉伸弯曲的经济方程涉及机器、工具、操作员、材料和润滑的变量及其对弯管质量的影响，以及对弯曲操作的经济影响。每个变量都是相互依赖的，必须在这个整体背景下理解。机器和控制装置构成初始投资，在选择机器时需要考虑相同的制造问题。机器的速度、可靠性、可靠性和适应性等因素综合了经济弯管操作的方程式。

THE ECONOMIC EQUATION FOR ROTARY DRAW BENDING RELATES THE VARIABLES OF MACHINE, TOOLS, OPERATOR, MATERIAL, AND LUBRICATION AND THEIR EFFECT OF THE QUALITY OF THE BENT TUBE AS WELL AS THE ECONOMIC IMPACT ON THE BENDING OPERATION. EACH VARIABLE IS INTERDEPENDENT ON THE OTHERS AND MUST BE UNDERSTOOD IN THIS OVERALL CONTEXT. THE MACHINE AND CONTROL MAKE UP THE INITIAL INVESTMENT AND THE SAME MANUFACTURING CONCERN NEEDS TO BE APPLIED IN SELECTING THE MACHINE. THE MACHINE FACTORS OF SPEED, RELIABILITY, DEPENDABILITY, AND ADAPTABILITY ROUND-OUT THE EQUATION FOR AN ECONOMICAL TUBE BENDING OPERATION.