Archive for September, 2016

Influence of Precision of NC Machine Tool on Machining

Here are some examples to illustrate the actual error in the machine is too large may encounter problems:
Case 1: influence factors: machine tool axis and Z axis axis parallel to the direction of the error is too large, or machine tool axis and X, Y axis perpendicular to the direction of motion error is too large, resulting in the spindle axis of rotation on the work table vertical error Big.
1, with the dial indicator to find the workpiece center hole, the establishment of the workpiece coordinate system, the processing disk workers
Ring-shaped pieces of holes, holes and hole center position error is too large.
2, with a large end milling cutter plane, the workpiece center was concave; to table as a benchmark,
End milling workpiece on the surface, the workpiece was ramp.
3, after boring, the hole of the axial bus and the base surface is not perpendicular to the workpiece pitch error is too large. 4, with a new milling cutter weeks milling parts, the workpiece was processed surface was ramp. 5, drilling after processing, the test was oval. 6, the end milling plane, then take knife knife mark uneven.
Case 2: Influencing factors: axial movement of the spindle is too large.
Resulting in: 1,
Pitch error occurs when thread is machined.
2, lathe turning, the end will be processed parts (end jump error) error. 3, the depth direction of the size of the processing error. 4, then knife marks uneven.
Case 3: Influencing factors: Spindle taper bore radial runout.
1, in the boring process, the spindle has pure radial runout error, then the boring out of the hole will be oval, the error is roundness error.
2, for turning, spindle runout mainly affects the workpiece coaxial error.
Case 4: Factors: Machine movement Cutting, the machine tool guide reverse gap is too large.
Result: 1, circular milling, resulting in over cutter marks. 2, weeks milling workpiece, the workpiece is not parallel to the two sides.

Case 5: lathe processing disk end surface, sometimes appear conical surface (convex or concave) or end cam-like shape, such as the spiral surface.
Factors: 1, the end of convex or concave in the main reason is that the cross-feed turret rails and spindle axis of rotation is not vertical, or transverse rail in the horizontal plane caused by not straight. 3,
The main reason for the cam-like end surface is the axial axial movement of the spindle or the horizontal guide rail is not straight.

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