Cutting amount selection for bearing sleeve machining
April 18, 2019
(1) The choice of backing the amount of knife
In roughing, in the case of process system rigidity and machine power allowable, take a larger amount of backing knife as much as possible to reduce the number of feeds; during finishing, to ensure the machining accuracy and surface roughness of the parts. According to the quality requirements of the machined surface, tool material, workpiece material and machine tool performance, refer to the cutting amount manual or related data selection: rough outer contour αp=2mm, semi-finish outer contour αp=0.75mm, fine car αp=0.4mm; Rough αp=1mm, fine αp=0.3mm.
(2) Selection of feed rate
When roughing, according to the processing material, the size of the tool bar, the diameter of the workpiece and the determined amount of backing knife, refer to the cutting amount manual or related materials and combined with the machine manual, select: rough car f=0.2mm/r, rough f =0.15mm/r; semi-finishing and finishing, according to the surface roughness requirements, according to the workpiece material, the radius of the tool nose and the cutting speed, select: semi-finished car f = 0.15mm / r, fine car f = 0.1 Mm / r, fine 镗 f = 0.1mm / r.
(3) Selection of spindle speed
According to the determined back-feeding amount, feed amount and workpiece and tool material durability, refer to the cutting amount manual or related materials, check the table to select the cutting speed Vc, rough car Vc=120m/min, semi-finished vehicle Vc=130m/ Min, fine car Vc=140m/min, rough Vc=60m/min, fine 镗Vc=70m/min, then use the formula (2-5) to calculate the spindle speed.
Vc = πdn/1000 (2-5)
Where: n is the speed of the workpiece or tool (r/min)
Vc is the cutting speed (m/min)
d is the turning diameter (mm) of the workpiece or tool corresponding to the selected point of the cutting edge
Combined with practical experience, the final spindle speed is: rough machining n=600 r/min, semi-finished car n=800 r/min, fine car n=1000 r/min, fine boring n=700 r/min, thread n = 500 r / min.
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