CNC machining surface parts, surface tool is very suitable for CNC machining center processing of the type of workpiece.Curved parts are also widely used in industrial fields, such as turbine blades, ship propellers, industrial products with cylindrical conical surfaces and so on.In the processing of curved surface, the general way of milling will be used.What should be paid attention to in milling surfaces?What should a complete surface machining process look like?
CNC machining surface parts also follow the processing rules of CNC machining center, namely rough machining (open rough) – semi-finishing – finishing – detail processing.The free-form curve and surface cannot be clearly expressed by geometric drawing and mechanical drawing.
Open rough CNC processing
In order to improve the milling efficiency, in the preliminary processing of the rough pieces of CNC machining curved surface parts, the vertical milling cutter can be used to milling layer by layer according to the allowance given by the processed curved surface.After rough milling, the shape of the surface will appear hierarchical distribution, step height depends on the accuracy of rough milling.Rough machining, because the machining allowance and cutting consumption are large, so in the cutting process generated a lot of cutting heat, easy to make the tool quickly wear, at this time should reduce the cutting area temperature, cutting fluid should be used in this stage, play a role of lubrication and cooling.
Half rough CNC machining
CNC machining semi-rough machining is essential, which is an important stage from roughing to finishing, the purpose of which is to mill out the excess parts left in the rough milling steps.Semi-finishing milling should be used ball head milling cutter, the row spacing and step spacing should be larger than the finishing milling, want to learn UG programming can add QQ group 304214709 to receive learning materials and courses, it should be noted that semi-finishing milling should be behind the finishing milling process set aside about 0.5 mm machining margin.After this process, the shape of the processed surface is close to the theoretical surface.
Finishing is the process of finishing a theoretical surface.Ball – head milling cutters are preferred for finishing cutting, usually by line cutting.In programming, we should pay attention to the choice of turning point and the determination of feed speed.For parts with better open, the turning point should be selected in the outside of the curve, that is to say, when programming, the surface should be appropriately extended to some.
For the parts with poor open property, the cutting speed will change during the reentry process, and it is easy to leave knife marks generated by pause and vibration on the CNC machining surface and the blocking surface. Therefore, the programming method just described is not applicable.The turning point should be positioned away from the blocking surface and the feed speed should be reduced during the turning.The intersecting line of the curved surface and the blocking surface should be processed separately in a root-clearing procedure, so as to ensure the smooth connection between the processed curved surface and the blocking surface and avoid obvious knife marks.
The main tool for machining curved surface workpiece is ball milling cutter
Ball end milling cutter
CNC machining ball head milling cutter material is mostly high speed steel, because of the structure and movement mode, ball head milling cutter cutting speed at the tip is very low.When a ball head milling cutter is used that is perpendicular to a relatively flat surface, the surface quality is poor.Therefore, should not be cut as far as possible, but also should appropriately increase the spindle speed.
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