Comparison of spherical type CNC body cutting type operation mode

When moving the circular arc of the method, in addition to the above method of rounding, there is also a method of moving the circle. The shifting method is different from the rounding method in that it keeps the radius of the turning arc constant, and by moving the position of the center of the circle, the desired circular arc is finally released [2]. See 2, the center of the circle from D through C, B, A to O, you can drive out the required arc. For example, the blank is "100mm, L=150mm, the outer turning tool with 2 positions. For the turning, see the arc shown in 3.

The car cone method is to first turn the blank into a cone and then in the arc of the car. This method should pay attention to the determination of the starting point and the end point of the car cone. If it is determined to be bad, it may damage the surface of the arc, and may also leave the margin too large. Connect the OC intersection arc to D, and pass the D point as the tangent AB of the arc. Since OC=2R, CD=2R-R=0.414R. From the relationship between R and â–³ABC, AC=BC=0.586R. When turning the cone, the machining path cannot exceed the AB line, otherwise the arc will be damaged. When R is not too large, AC=BC=0.5R. The numerical calculation of this method is cumbersome, but the tool goes to a shorter route, so for the turning of more complicated arcs, the car cone method is more complicated, and the car circle method is simpler.

For example, the workpiece shown in Figure 5 is machined with a blank diameter of 46. The No. 1 tool 900 is used as the knives, the No. 2 knives are the grooving knives, and the No. 3 knives are the 900 reverse knives. The process route is as follows: (1) The left end of the workpiece is clamped by a three-jaw self-centering chuck, and the bar material extends 82 mm from the workpiece. (2) Use the No. 1 900 forward-biased cutter to the right end of the workpiece, and the outer diameter of the vehicle is 45mm × 76mm. (3) Rough the right hemisphere with the car cone method. (4) Call the No. 2 grooving knife, and cut 20mm × 30mm from right to left by the cutting method, and leave a margin of 0.3mm for 20mm diameter. (5) Fine car 20mm × 30mm. (6) Replace the No. 3 900 reverse-biased knife, and the rough left-handed hemisphere (roughing by the car cone method). (7) Fine car left hemisphere. (8) Replace the No. 1 900 forward-biased knife and finish the right hemisphere. When turning the workpiece by the car cone method, the positive and negative knives must be very accurate to the knives, otherwise an obvious seam line will be produced in the middle of the ball. To avoid seams, a round turning tool can be used. Right hemisphere and left hemisphere.

Concluding remarks (1) Because the cutting ability of the external turning tool is stronger than that of the circular turning tool, the external turning tool should be used as much as possible without interference; (2) When the interference is serious, the turning head can be completed twice. The method of arc machining. However, the accuracy of the Z-axis calibration should be guaranteed at this time. From the three common methods of the above-mentioned ball arc CNC turning, it can be seen that the ball arc machining on the CNC lathe is much more convenient than on the ordinary lathe. The general method of machining a spherical surface on a conventional lathe is to use a two-hand rush method and a forming tool method. In the machining of spherical workpieces on CNC lathes, as long as one of the above methods is selected, and the corresponding circular interpolation program is written according to the format requirements of the numerical control system programming, the spherical workpieces meeting the requirements can be processed.

(Finish)

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