The shape of the taper twin screw has two types: straight and involute. b, c, and d show the axial cross-section of the conical twin-screw, and b shows the straight-toothed shape. It is an involute tooth profile. The biggest advantage of the straight profile is that the machining is simple, but in operation, the meshing clearance varies from one tooth to the entire meshing process. In the conventional machining, the self-sharpening cone is used. The cutter is used to form a straight profile; while the involute threaded pair of screws can ensure equal clearance engagement during the engagement of one tooth and the cutting engagement, but such a tooth profile is extremely difficult to machine.
Based on the in-depth analysis of the geometry and meshing characteristics of the conical twin-screw, this paper proposes a new method for machining the spiral groove of the conical twin-screw rotor. This new method is simple and standard by using a more complicated five-axis CNC screw milling machine. Cylindrical rod milling cutters are used to achieve this. The five control axes are shown as b. The tool makes three mutually perpendicular linear motions and B-direction rotations with respect to the workpiece in the X, Y, and Z directions, and the workpiece rotates in the C direction. In this more complicated machine, only a simple cylindrical standard rod milling cutter is used, and the swing of the tool and the displacement of the Y-axis are made by the B-axis of the machine tool to make the tool and the workpiece spiral surface tangent in the axial section. The processing of the conical spiral surface is formed by the linkage of X, Z, and C. It can be seen that the method uses only a small number of standard rod milling cutters, and the left and right sides of the straight profile groove can be milled by the rotation of the B axis of the machine tool. The rotation angle of the B axis is equal to the cone cutter in the conventional method. The half cone angle (as in equation (2)). It is also easy to process a screw that simplifies the involute profile. In this processing method, advanced technologies such as modern machine tools, multi-axis CNC and compensation calculations are comprehensively applied to greatly reduce tool specifications and tool change times, improve the flexibility of the machine tool, and greatly improve the manufacturing of the workpiece. Accuracy, interchangeability and manufacturing efficiency. This is the advantage of this new type of cone-screw CNC manufacturing technology proposed in this paper.
Cone twin-screw NC machining automatic programming system Because the spiral twin-screw rotor has a complex spiral surface profile, the trajectory of the milling process with a rod milling cutter is computationally intensive, involving workpiece geometric parameter input, tool parameter selection, tool path calculation, and tool interference determination. A lot of complicated work, such as repeated calculation of tool nose error compensation, these tasks are difficult to implement manually, and are easy to make mistakes, and are easy to use computer-aided completion. In order to make the user easy and convenient to master these complicated work, this paper developed a cone-twist rotor spiral surface CNC milling automatic programming system, in addition to workpiece geometry input, spiral surface profile modeling, tool milling track calculation, tool In addition to various computer-aided manufacturing CAM (programming CAPP) functions such as interference determination, process parameter selection, and numerical control program generation, the screw meshing simulation function is also available, so that the design parameters of the meshing sub-profile and the gap can be checked.
Conclusion The essence of the new technology of cone twin-screw CNC milling proposed in this paper is to use modern higher level machine tool design and numerical control technology, combined with a large number of cumbersome computer-aided manufacturing work, so as to improve the manufacturing precision and manufacturing efficiency of cone twin-screw and reduce the use. The purpose of the specification of the tool is to simplify the shape of the tool by increasing the movement of the machine tool. This is also an important direction for the development of modern manufacturing, which will certainly promote the technological progress of the screw extruder industry.
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