The part has an angle between the profile of the part and the mounting plates at both ends, and the origin of the coordinate system of the profile line in the design drawing is not on the axis of the part, but at the intersection of the exhaust edge and the tangent of the back arc, Offset to the axis, that is, the origin of the part coordinate system is converted to the origin of the machine coordinate system in the three-dimensional space. If the order of rotation and translation is different, the results are different. After practice, it is concluded that: After the three-step rotation is completed, the translation command is executed to the origin position of the part machining coordinate system, and finally the three axes are rotated by a right angle to achieve uniformity with the machine coordinate system direction. Tool determination Because the part allowance is too large, according to the actual machining center, the company's 60-bar diameter milling cutter can accept strong cutting and meet the processing requirements. The choice of machining drive surface In the selection of machining parameters, the surface drive mode is selected, and the back arc profile is extended along the tangential line at the intake side, and then the command in the surface function is used to extend the guide string along two same curvatures. The back arc is stretched and the curved surface is formed as the driving geometry of the back arc. The purpose of this selection is because it is considered that the machining range of the generated tool path program must be larger than the part, so that the center of the tool can be pulled out along the tangent line, and the tool track marks of the processed parts are smoother, and there is no card when measuring on the measuring tool. point. Determination of the safety surface Since the CNC machine tool for machining the guide vanes is a four-axis linkage milling machine, the spindle cannot be rotated during machining. In the case where the angle between the tool and the part cannot be changed at the beginning of the machining, only one-way cutting can be considered. That is, after one pass is completed, the spindle is lifted and returned to the intake side of the part, and the safety surface needs to be defined. It is to determine the direction and height of the lifting knife. Make the processing time the shortest and not overcut. Blue-green indicates the center of the knife, gray dotted line indicates the lifting knife, red dotted line indicates the safety surface, and yellow dotted line indicates the falling knife, milling from the inlet side of the part to the exhaust side of the part. Since the curvature of the back arc inlet side of the guide vane is small and even extends to form a hook shape, if only the C program of other parts is programmed, and the margin control is adjusted by the method of raising or lowering the knife, it will be generated. Cut, and the margin of the part is indeed too large, and finally decided to program two programs, the processing allowance of a program is 6AA, after calculation, the maximum lifting knife 7AA is allowed, it will not be overcut, and the other program will be processed after the allowance. It is 425 to meet the finishing requirements. After adjusting and groping, finally finished the qualified parts, and obtained satisfactory results, achieving mass production. Using the powerful modeling function of 3D software such as DE, the 3D model of the very complex parts is built, and then the shape characteristics of the 3D model are analyzed. Combined with the processing characteristics and precision of the CNC machine tool, the parts with very complicated shapes are processed. At present, this approach is a hot spot to study the processing of complex shape parts, and will be widely used in the field. (Finish)
Henan Qianli Machinery CO. Ltd is a profession manufacture of Farm Tractor, rice machine, reaper machine, Power Tiller, garden machine and other farm implements. Our factory was established in 1987 and has more than 30 years of production and sales experience. We focus on providing customers with high-quality products and excellent services.
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