Skip the car at the rig, and after the other dimensions are fixed, re-attach the rack. There are two ways to connect the frame. One is to use the program to control the right center frame. The right center frame and the upper road are connected to the right center frame. The left center frame is loosened. The left center frame of the car is leveled with the upper road. . This method is because the center frame is always supported when the frame diameter is used, the rigidity of the workpiece is not good, and vibration is generated. Therefore, the surface roughness value at the frame diameter is large, and the wrong tooth is easily generated (the wrong tooth is inside). Because there is still a grind, it can be used in this small batch production in this way. If mass production is carried out, the cones can be fixed in size, and the two center frames are manually placed to the right to the original rack position, and placed on the tapered surface behind the finished car. Good dimensional accuracy and surface roughness are achieved, and no wrong teeth are produced. Selecting the tool When roughing the test, select the semi-finished blade with the nose radius of % and the left turning tool. If the radius of the tool tip is too large, the resistance is large, and the workpiece vibrates. If the radius of the tool tip is too small, the blade is easily worn and the service life is short. For finishing, select the finishing blade with a tool nose radius of 0, the left turning tool (to ensure the machining accuracy and surface quality of the workpiece. The blade selects the coated carbide inserts from Kenneth, the blade material), and the material is hard. The alloy is used for ultra-finishing and semi-finishing of steel parts, and has the property of resisting plastic deformation and high hardness, and can achieve high economic efficiency and productivity under high-speed cutting conditions. Practice has proved that other general blade machining, one workpiece, the blade must be worn out and replaced, and the Kenner blade can be used for machining, and the workpiece is cost-effective.
When selecting the cutting parameters, in order to obtain better surface quality, theoretically increase the rotation speed and reduce the feed rate. According to the large aspect ratio of such products, the rotation speed is too high, the workpiece generates vibration, and the surface is corrugated. If the rotation speed is too low, the surface roughness value is large. According to the characteristics of the multi-cone surface of this product, the constant cutting speed is selected, and the spindle rotation speed changes with the current machining workpiece diameter, so that the cutting speed programmed at the cutting point of the tool is always constant (the spindle rotation speed 4 diameter 5 constant). Initially select a constant line speed of 7. According to the formula, when the workpiece is machined from large diameter to small diameter, the spindle speed may be increased very much. In the program, the command has the tool nose radius compensation function (ie 80/left compensation and 80-right compensation function). Program according to the contour shape of the part. When programming, it can be assumed that the tool radius is zero. Before the NC machining, the tool radius value must be entered in the corresponding tool compensation number on the CNC machine. During the machining process, the numerical control system automatically calculates the imaginary tool nose trajectory according to the machining program and the tool arc radius, and performs the tool radius radius compensation to complete the machining of the parts. When the tool radius changes, you do not need to modify the machining program, just modify the corresponding tool number compensation number and tool arc radius value. It should be noted that in addition to the input corner radius, the position of the imaginary tool tip relative to the center of the ball cutter should be entered. This is because the tool nose positions of the inner and outer turning tools or the left and right knives are different. When the CNC system of the CNC lathe has a tool length compensator, it can be programmed directly according to the contour shape of the part. Before the machining, input the above values ​​in the tool length compensator of the machine tool, and call the compensation number of the corresponding tool during machining.
(Finish)
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