The economic NC machine tool is a simple numerical control machine. The NC machining control program needs to be compiled according to the contour line of the wheel profile. It can not only meet the technical requirements of the drawing, but also the production cost is low. Therefore, it is necessary to reformulate a reasonable processing route according to the structural characteristics of the machine tool, and to design the fixture, tool and process program adapted to it. The special fixture designed must satisfy the established processing route and be able to automatically centering to reduce the auxiliary time needed in the whole process. The following is a brief introduction of the advantages and attentions of the economic lathe.
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First, the advantages of economic machine tool processing
(1) the holes and grooves on the axis of the two pairs of claw are evenly spaced, and the rotation working table should be used on the boring machine to divide the wheel in one time, so that the wheel load is balanced and the clamping is reliable.
(2) the axis diameter required for the wheel processing should be determined by the diameter of the inner hole that needs the machining wheel, and the two pairs of claw which match the inner hole size should be selected, and the claw is installed on the actual machining position, the top wire is fixed on the axis and the other end of the claw is turned into the inner hole of the wheel on the machine tool. The size is fitted to fit the wheels easily, and the clamping force of the clamp is large enough.
(3) in order to ensure that the whole fixture has sufficient rigidity and interchangeability, the mandrel and the base should be threaded and the large pitch trapezoidal thread should be used. The economic CNC machine tool is a CNC machine tool and the servo feed system under control. It can make the tool move in the space according to any given trajectory. In the process of the execution of the control program, the tool path does not change because the blade is transposition and the new blade is replaced. The tip position change should be small enough. Therefore, it is necessary to use interchangeable cutting tools.
Two. Attention to the processing of economic lathe
(1) to avoid the curvature interference between the tool and the wheel profile, the radius of curvature of the tool must be less than the curvature radius of each part of the wheel.
(2) the profile of the wheel often has edges and corners, and the coordinates of the tool center should be offset.
(3) knife complement is the same point, a certain number knife relative to the reference knife in two aspects of the deviation, the reference knife does not have a knife to fill, if set up a knife supplement is also convenient for self tuning.
(4) the temperature of the general workpiece will rise quickly in the process of the lathe processing, and the special cutting oil must be used to cool the workpiece. Otherwise, the precision of the workpiece will be reduced and the precision of the tool will be reduced, so a large amount of cost will be put into the tool.
(5) the origin of the program can be any point on the standard axis, but in order to facilitate programming and tool setting, the center of rotation of the right end of the wheel is often selected at the origin of the program.
(6) the tool point is also arbitrary, but in order to reduce the tool space and increase the productivity, the position of the wheel is generally chosen, but the distance between the wheel and the tool holder is to ensure that the tool holder has enough space for rotating the knife.
(7) the coordinates of the direction in programming are programmed in terms of diameter.
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