课件参考成果5.ball

1、Ball screws applicationsOctober 30, 2007 SKF Group Slide 1 1Miniature rolled ball screws(6-16mm)October 30, 2007 SKF Group Slide 2 Portable plumber toolThe ball screw is fitted in the portable tool used by plumbers for cutting, riveting and forming plastic pipes.The ball screw is working beyond the

2、standard load capacities (20 kN whereas the dynamic capacity is 11,8 kN).To fit the reduced space required by the customer, and in agreement with him, we tested a screw with performance inferior to the one to be selected normally for such an application. Tests have been largely positive and therefor

3、e we gain the market. Miniature ball screw SD 16 x 5 with special nut (5 ball circuits) total screw length 122 mmOctober 30, 2007 SKF Group Slide 3 Electrical shearsA motor drives a highly efficient SD 10 x 2 ball screw through a planetary gear. This gives very fine control with the finger and also

4、the power to cut a broom handle.Accumulators give 6 hours of independence for pruning vines and fruit trees.October 30, 2007 SKF Group Slide 4 Small lathes for educationThese machining lathes are used to learn the numerical control principle.The ball screws SD 12 x 5 control the movement of the diff

5、erent axes:Moving the table (X axis)Moving the milling head (Y and Z axes)Three ball screws per machines, with a special nut (wiper and lubrication hole)October 30, 2007 SKF Group Slide 5 Dental restauration3 miniature ball screws replace sliding screws in computed-aided dental crown milling machine

6、.The SD 8 x 2,5 using a spring preload, meets the high precision customer requirements.9.000 screws/yearOctober 30, 2007 SKF Group Slide 6 Reeducation deviceThis machine is made to re-educate leg after accident or surgery. It helps the patient to recover the amplitude of his movements. The customer

7、has created this concept of rehabilitation, which divided by 2 time of “usual“ re-education, by a repetitive mechanical movement of the limb. Reversible screw enable the patient to declutch motor if too much load applied. Rolled screw and LBBR gives them very good value for money including reliabili

8、ty and qualitySH 16 x 5 R G91 per machineLBBR 12 4 per machineShaft D 12.2 per machineOctober 30, 2007 SKF Group Slide 7 Mammography X-rayTo ensure the patient safety SH-ball nuts on C-arm are equipped with safety rings. Compression of the breast is done by SD 8 x 2,5 and 12 x 4 ball screws, guided

9、by LBBR. The C-arm is guided by LBCF 25. The lifting of the main pillar as well as rotation of the C-arm is made with two Hanning 220V actuators.October 30, 2007 SKF Group Slide 8 Lens grindingIn order to prepare and adjust in short time the lenses on the spectacles, the opticians have in their shop

10、 an edging equipment. This machine prepares the lenses in the outer dimensions of the spectacles. (grinding process)Accuracy required: 0,1 mmThe rocking and guiding movements of the grinding head are driven by 2 SD miniature ball screws, which guarantee a right axial movement all along the glass. “W

11、e need a very reliable product, because this edging machine is delivered in all countries. We are not sure that the maintenance will be done in a proper way SKF choosed the SD screws 16 x 5 (2 screws per machine) for several thousands of pieces per year.October 30, 2007 SKF Group Slide 9 Aircraft pa

12、ssenger seatA passenger has an electronic card which memorizes the seats ideal position for him. He can then immediately adjust it when he arrives in the aircraft.Passenger safety is assured by an adjustable automatic return stroke. Actuators can be electrically checked very quickly and replaced in

13、5 minutes.Every linear actuator uses a ball screw and potentiometer. Each seat has up to 14 actuators which recline, move the foot, leg and head rests as well as back support. 8 x 2,5 is used in the headrest. SD 8 x 2,5 R with total length varying from 107 to 250 mmSD 12 x 4 R with total length vary

14、ing from 117 to 330 mmOctober 30, 2007 SKF Group Slide 10 Actuator for the Boeing 787, FranceThe minimum ballscrew SD 12 x 5 is fitted in an actuator which stimulates a force return in the joystick.3 actuators per joystick1 only uses a ball screw2 joysticks per aircraftThe weight is a critical selec

15、tion factor, which explains that the screw is a holed shaft. For the same reason, length & diameter of the nut have been minimised. Weight of the assembly: 124 gOctober 30, 2007 SKF Group Slide 11 Missile flap controlMissile fin actuation, three or four flaps per missile, screws are used to turn fla

16、p and guide the missile. Quality systems, clean assembly, vacuum packing, test rigs and SPC control have been built up over the years.SH 5 x 2,54, 8 x 2,5, 12,7 x 12,7SD 6 x 1,25, 10 x 2, 10 x 2,5, 12 x 3Stainless steel + decontaminationNuts with trunnions ; shaft thread rolled or groundOctober 30,

17、2007 SKF Group Slide 12 Windshield wiperThe A400M is a polyvalent military aircraft developed by Airbus; 400 aircrafts are already ordered, which represents a potential of 800 screws. Already delivered 30 pieces.2 ball screws, type SD 12,2 x 2 drive the windshield wipers.Usually, the windshields are

18、 driven by cam motors (only one rotation possibility).Falgayras offered a linear actuator, using a servomotor rotating clockwise and anti-cwCustomer benefits: More precise movement (+/- 2e angle) Better speed control Compact solutionOctober 30, 2007 SKF Group Slide 13 New project development: improv

19、e the ball screw design using the same type of the actuator.Windshield wiperAdvantage sought: costs reduce Reviewing the complete ball screw design Integration of the anti- function Transition to rolled screwEstimated potential: 3000 aircrafts equipped by this technology 6000 ball screws / 20 years.

20、 C-Series - Bombardier MRJ - Mitsubishi.October 30, 2007 SKF Group Slide 14 2Large rolled ball screws(16-63mm)October 30, 2007 SKF Group Slide 15 Railway point changingADTranz market the point machine worldwide.Design changed from gear wheel and rack:Easier connections to the railLess space neededHi

21、gher reliabilityBall screw used: SX 25 x 10 R, phosphated and greasedOctober 30, 2007 SKF Group Slide 16 Italian railwaysThis order came through a distributor. Final customer, based in Firenza, manufactures rail point changes used in Italy and in Tibet.Potential is high: 2,000 pcs per year, spliited

22、 in two suppliers.The screw is a 25 x 5, 6 starts, with a customized nut. It is supplied with a special device, working as a dog stop, for case the limit switch does not work properly.October 30, 2007 SKF Group Slide 17 Knitting machines, GermanyThis customer manufactures 4,000 machs per year. 80% a

23、re exported to China. Each machine is equiped with a ball screw 25 x 5 length 300 mmThe ball screw is used for moving a table where hundreds of knitting needles are located.October 30, 2007 SKF Group Slide 18 Textile machines, FranceThe SX ball screws: SX 50 x 10 with FLRBU thrust bearings units, ra

24、ise the wire coils.The FLRBU thrust bearings, usually sold with roller screws, are adapted to the application requiring higher load capacity.October 30, 2007 SKF Group Slide 19 Woodworking equipmentLong lead rolled ball screws move the 3 machines axes:SL 40 x 40 for the X axis, high speedSN 32 x 10

25、for the Z axisSL 32 x 20 for Y axisIn some woodworking applications, the rotating nut assembly offers higher speed and less inertiaOctober 30, 2007 SKF Group Slide 20 Machine toolBall screw technology was designed in, for following reasons:Mechanical stiffnessRobustness/machine longevityCompactnessS

26、N ball screws 63 x 10 in various lengths have been usedOctober 30, 2007 SKF Group Slide 21 Foam cuttingBall screws and profile rails are used to load and unload the big foam pieces.The machine should be very flexible to the demand of the end user, which is often the automotive industry.Good support

27、to the technical questions, good service even if with higher prices. Lower noise level and better sealing of ball screws result in better machine performances. Product information: Long lead ball screws, SL 40 x 40 Different types of profile railsOctober 30, 2007 SKF Group Slide 22 Flexographic prin

28、ting machinesThe preloaded ball screws have to position the printing rollers, which are guided by both profile rail guides and precision rail guides.Characteristics of the application:High stiffness requestedHigh vibrationDirty environmentThe key success factor of this business has been the good tec

29、hnical relationship between SKF and the customer who was buying screws and rail guides from NSK.Products: PN 32 x 5 ball screws LLBHC 25R and LWRPV/MOctober 30, 2007 SKF Group Slide 23 Press brakesIn each press brake, we deliver the two horizontal ball screws to move the rear stops (click on the bel

30、ow picture to see the movement).The preloaded ball screws: BN 25 x 5 adjust the rear stops.The precision rolled ball screws, in some cases, have a special customized nutType of assembly:SNT 25 x 5R total length 380 mmLead precision G7October 30, 2007 SKF Group Slide 24 E.D.MEach EDM machine is equip

31、ed with 5 ball screws, BN 25 x 5.They are used to manage the relative position between the piece to be eroded and the wire.Our ball screws are appreciated for their smoothness at very low speed.Moreover, we have tested and mended a special lubricant for these non standard working conditionsOctober 3

32、0, 2007 SKF Group Slide 25 Cardboard machinesBall screws serve to position the knives for cutting and preparing the corrugated board for bending.Product:SL 32 x 40R 2620/2727 G5OrSN 40 x 5 et SN 25 x 5October 30, 2007 SKF Group Slide 26 Quarz & silica forming/processingHealthway design and manufactu

33、re a range of horizontal forming machines for the production of tubing, from quartz or silica. The machine is like a lathe used to prepare optical fibre silica preforms. The screws move a saddle with a flame to heat treat the material.TN 25 screws with thrust bearings and Gamfior PGFE 50.Also some P

34、RGs LLBNS 15 TRHealthway have user rolled thread screws for years without any quality issues. They are confident with SKF and like trouble free supply. We have to be competitive with a reliable delivery performance. We maintain good service contact and are responsive to their needs.October 30, 2007

35、SKF Group Slide 27 X-Y glass cutting sawLinear guiding and drive of X and Y axes of a cutting wheel. The machine cuts glass, e.g. television tubes. Application in highly polluted environment (glass dust).Product information:Drive with ball screws:BN4WH + K 32 x 5R 813/952 G7BN4WH + K 32 x 5R 921/106

36、0 G7BN4WH + K 32 x 5R 461/600 G7Guiding with profile rail guides:LBHS 35 TA 2 T1 1080 P3 W2LBHS 35 TA 2 T1 1200 P3 W2LBHS 35 TA 2 T1 640 P3 W2October 30, 2007 SKF Group Slide 28 Rubber injection for tyresRubber injection machine to manufacture tyres with 10 axes (moulding segments). In each axis, there are 1 ball screw, 1 flanged bearing unit (FLBU), 2 shock absorbers + accessoriesFor each machine (100 machines/5 years), we have: 10 SX 25 x 10 R 408/510 G9 L-Z WPR 10 FLBU 25 KMT3 10 shock absorbers SA