C620 lathe spindle front end bearing
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The transformation of 1 headstock 1 front end bearing hole
The headstock 1 processing front end bearing holes into ? 150K6. In order to facilitate loading and unloading in bearing, bearing hole is processed ? 151mm, 55mm long hole. In addition to drill ? 16mm hole, to facilitate the operation of the fastening screws 5.
Schematic diagram of C620 lathe spindle front bearing improved
1 2 3 spindle headstock adjusting nut 4 nut stopping pad 5 fastening screws
6.3182120 bearing 7, bearing cap pressure ring 8 bearing cap
The transformation of 3 2 spindle
According to size and position shown in the spindle machining threads M100 * 1.5mm 3, 2, and the configuration adjusting nut nut stopping pad 4 and a fastening screw 5. ② according to size and position shown in the main processing 1:12 taper and bearing 6 inner cone hole match 3.
Processing of 3 bearing cover 8, bearing cap pressure ring 7
The original sliding bearing adjusting nut internal thread processing into bearing the car, as shown in Figure 8 (not cover size dimensions is the original parts available). The size of the original bearing cap pressure ring machined bearing as shown in the cap pressure ring 7.
4 spindle 3 axial, radial clearance adjustment
The spindle axial momentum with the adjusting nut adjusting the back end of the main shaft, the movement should be 0.015mm support the measured shaft shoulder. The spindle radial runout of the centring journal, by adjusting nut 2 adjustment, the bearing radial clearance of 6 trace, radial shaft centering shaft runout should be 0.02mm.
The modified machine accuracy are as follows:
Radial axis centering shaft runout is 0.01 ~ 0.03mm;
Spindle axial momentum 0.015mm;
Axis of spindle and slide mobile parallelism in the 300mm length is 0.02mm (in the vertical to the horizontal plane);
Cross frame lateral movement of the spindle axis lines of production in 3000mm for 0.02mm (concave);
The head and the tail seat two top height deviation is 0.03mm;
In 300mm long axis precision turning round measured: roundness cylindricity for 0.02mm, for 0.03mm;
In a 300mm diameter on the finishing surface flatness is 0.02mm (concave);
The surface roughness of Ra6.3 ~ 3.2mm.
The above data with JB2670 - 82 "metal cutting machine tool accuracy inspection rules". The quality of the products are improved obviously than no transformation of spindle bearing of machine tool.
234407BM 234706BM 234406BM 517/2860V/YA 5610/2500 517/1720X1V 527/1181M 510/1180M 517/930 510/670 590/560 510/500 52780 59080 517/368M 51760U 517/238 6207-2ZN 6206-2ZN 6205-2ZN 6204-2ZN 6203-RZ 6203-2ZN 6202N 6202-2ZN 6201-2ZN 6200ZZ 6200-2ZN 62/32-ZN 62/32-Z 62/32N 62/32-2Z 62/32-2RZ 62/32-2RS 62/28-2RZ 62/22-2RZ 61996 61992 61988 61984
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In the past C620 lathe spindle front-end old-fashioned, low installation is sliding bearing, while the sliding bearing has the advantages of simple structure, convenient manufacture, low cost, stable operation, to the shock and vibration insensitive, but it has been far can not meet the requirement of modern high speed cutting machine, high precision, high efficiency requirements, but wear very difficult repair parts processing, surface roughness and precision, productivity is very low. Therefore, on the front of the sliding bearing C620 lathe spindle was modified, the specific steps are as follows (see Figure)The transformation of 1 headstock 1 front end bearing hole
The headstock 1 processing front end bearing holes into ? 150K6. In order to facilitate loading and unloading in bearing, bearing hole is processed ? 151mm, 55mm long hole. In addition to drill ? 16mm hole, to facilitate the operation of the fastening screws 5.
Schematic diagram of C620 lathe spindle front bearing improved
1 2 3 spindle headstock adjusting nut 4 nut stopping pad 5 fastening screws
6.3182120 bearing 7, bearing cap pressure ring 8 bearing cap
The transformation of 3 2 spindle
According to size and position shown in the spindle machining threads M100 * 1.5mm 3, 2, and the configuration adjusting nut nut stopping pad 4 and a fastening screw 5. ② according to size and position shown in the main processing 1:12 taper and bearing 6 inner cone hole match 3.
Processing of 3 bearing cover 8, bearing cap pressure ring 7
The original sliding bearing adjusting nut internal thread processing into bearing the car, as shown in Figure 8 (not cover size dimensions is the original parts available). The size of the original bearing cap pressure ring machined bearing as shown in the cap pressure ring 7.
4 spindle 3 axial, radial clearance adjustment
The spindle axial momentum with the adjusting nut adjusting the back end of the main shaft, the movement should be 0.015mm support the measured shaft shoulder. The spindle radial runout of the centring journal, by adjusting nut 2 adjustment, the bearing radial clearance of 6 trace, radial shaft centering shaft runout should be 0.02mm.
The modified machine accuracy are as follows:
Radial axis centering shaft runout is 0.01 ~ 0.03mm;
Spindle axial momentum 0.015mm;
Axis of spindle and slide mobile parallelism in the 300mm length is 0.02mm (in the vertical to the horizontal plane);
Cross frame lateral movement of the spindle axis lines of production in 3000mm for 0.02mm (concave);
The head and the tail seat two top height deviation is 0.03mm;
In 300mm long axis precision turning round measured: roundness cylindricity for 0.02mm, for 0.03mm;
In a 300mm diameter on the finishing surface flatness is 0.02mm (concave);
The surface roughness of Ra6.3 ~ 3.2mm.
The above data with JB2670 - 82 "metal cutting machine tool accuracy inspection rules". The quality of the products are improved obviously than no transformation of spindle bearing of machine tool.
