G-1 SLIDE GUIDE STROKE BALL SPLINE ROTARY BALL SPLINE BALL SPLINE TOPBALL PRODUCTS SLIDE BUSH SLIDE UNIT SLIDEROTARYBUSH STROKE BUSH SLIDE SHAFT

Transkript

1 ROTARY STROKE G1

2 Advanced Machining Technology: NB will perform a wide variety of highly accurate machining processes to provide custom shafting from relatively simple machining, such as tapping and shaft stepping to the more demanding highspeed rotating shafts and spindles. NB can also perform special grinding and bore machining requirements. Excellent Wear Resistance: High wear resistant carbonchromium bearing steel (SUJ2) and Martensite stainless steel (equivalent to SUS440C) materials are most coonly used. These materials are annealed and tempered to achieve a reliably uniform hardened layer in both the circumferential and axial directions. A crosssectional photograph illustrating the hardened layer depth of the NB slide shaft is shown below. The NB slide shaft is used with bearings such as a slide bush in order to obtain highly accurate linear motion. When used in combination with a slide bush, the shaft performs as the inner race of the bearing system. The quality and accuracy of the shaft directly affect the performance of the slide bush. NB slide shaft is manufactured with an emphasis on quality and accuracy to ensure stable functionality under many operating conditions. Superior performance is guaranteed for both rotational motion and combined rotation and linear motion. ADVANTAGES Surface Roughness: Precision grinding results in a surface roughness of less than 0.4 Ra. Wide Selection of Shaft Types: SN type SNS type SNT type Tapped shaft type (SNB/SNSB type) SNW/SNWS(Inch type) SNWPD/SNWSPD(Inch type predrilled shaft) Special requirements: NB will provide slide shafts meeting special requirements (including special shapes and materials). G2

3 TYPES SN/SNS/SNT Type (NB Shaft) P.G,7,8 SNB/SNSB (NB CenterLined Tapped Shaft) P.G9 SNW/SNWS Type P.G10,11 NB's SN/SNS slide shaft is a highprecision, straight, machined shaft series that may be used with a slide bush or as material in other applications. Table G1 SN/SNS Specifications type SN Type SNS Type SNT Type material SUJ2 equivalent to SUS440C SUJ2 outer diameter tolerance g or to be specified hardness 0HRC or more 5HRC or more 0HRC or more surface roughness less than 0.4Ra page page G page G7 page G8 The SNT pipe shaft may be used to reduce weight without reducing the material's rigidity. It may also be used for channeling electrical wires, hydraulic, or pneumatic sources. Table G2 SNB/SNSB Specifications type material outer diameter tolerance hardness surface roughness page SNB type SNSB type SUJ2 equivalent to SUS440C g or to be specified 0 HRC or more 5 HRC or more less than 0.4Ra page G9 The SNW series are inch dimension shafts with the same quality level as SN/SNS type. PD (centerlined tapped hole) type is available for relatively long shafts. PD type can be used with WA shaft support rail (page E4) for better performance. SNW/SNWS type SNWPD/SNWSPD type ROTARY STROKE G3

4 CALCULATION OF DEFLECTION AND DEFLECTION ANGLE The following formulas can be used to obtain the deflection and its angle of a linear slide shaft. Some typical conditions are listed in Table G3. Table G3 Formulas for Calculating Deflection and Deflection Angle support method specification formula for deflection formula for deflection angle 1 support support 2 3 support support uniformly distributed load 4 uniformly distributed load 5 support support 7 8 uniformly distributed load 9 support support 10 1:deflection when load is applied()max:maximum deflection()i 1:deflection angle when load is applied(rad)i 2:deflection angle at the support(rad)mo:moment(n)p:concentrated load(n)p:uniformly distributed load(n/)a,b:loading point distance:span() l:geometrical moment of inertia( 4 )E:modulus of direct elasticity (N/ 2 )C:1/48El(1/N 2 ) G4

5 The Geometrical moment of inertia (I) is obtained using the following formula: For solid shaft For hollow shaft D 4 I = I = (D 4 d 4 ) 4 4 I : geometrical moment of inertia ( 4 ) D : outer dia. () d : inner dia. () The values of the geometrical moment of inertia and C (=1/48 I) for NB slide shafts are listed in Table G4 and G5. Calculation Examples: 1. Calculate the maximum deformation of a shaft with an outer diameter of 30 and a span of 500 when a concentrated load of 980 N is applied at the midpoint of the shaft (neglecting the weight of the shaft). supportsupport : From the given conditions, P is 980 N and is 500 From Table G4, C for an outer diameter of 30 is 2.54 x (1/N 2 ). Substituting these values into the corresponding formula in Table G3, max = P 3 C = : Substituting the values into the corresponding formula given in Table G3, 1 max = P 3 C = 0.08 () 4 2. Calculate the maximum deformation of a shaft with an outer diameter of 0, an inner diameter of 32, and a span of 0 due to its own weight. From Table G5, C for an outer diameter of 0 is C = 1.73x10 13 (1/N 2 ) The mass per unit length of a shaft with an outer diameter of 0 and an inner diameter of 32 is 15.9 kg/m. Therefore, a uniformly distributed load of 0.15 N/ is applied. Substituting these values into the most appropriate formula for your application given in Table G3. 5 max = p 4 C = 0.27 (). 8 G5 Table G4 Geometrical moment of inertia and C for NB Slide Shafts outer diameter D() Geometrical moment of inertia l( 4 ) C=1/48El (1/N 2 ) Table G5 Geometrical moment of inertia and C for NB Pipe Shafts outer diameter D() inner diameter d() Geometrical moment of inertia l( 4 ) C=1/48El (1/N 2 ) ROTARY STROKE

6 SN TYPE NB Shaft part number structure example SN 20 h5 57 SN type outer diameter (D) length (L) outer diameter tolerance g when blank straight machined (example) part number SN 3 SN 4 SN 5 SN SN 8 SN 10 SN 12 SN 13 SN 15 SN 1 SN 20 SN 25 SN 30 SN 35 SN 40 SN 50 SN 0 SN 80 SN SN120 SN150 outer diameter D tolerance g* 3 2/ /39 length L material: highcarbon chromium bearing steel(suj2) hardness: HV97 (0HRC) or more Tolerances other than *g are available upon request. mass kg/m G

7 SNS TYPE NB Stainless Steel Shaft ROTARY STROKE part number structure example SNS 20 SNS type outer diameter (D) straight h5 57 length (L) outer diameter tolerance g when blank machined (example) part number SNS 3 SNS 4 SNS 5 SNS SNS 8 SNS 10 SNS 12 SNS 13 SNS 1 SNS 20 SNS 25 SNS 30 SNS 35 SNS 40 SNS 50 SNS 0 SNS 80 SNS outer diameter D tolerance g* 3 2/ / material: Martensite stainless steel (equivalent to SUS440C) hardness: HV13 (5HRC) or more The length of hardening is up to 4500 for shafts with diameter over 80. Tolerances other than *g are available upon request. G7 length L mass kg/m

8 SNT TYPE NB Pipe Shaft part number structure example SNT 25 h5 57 SNT type outer diameter (D) length (L) outer diameter tolerance g when blank straight machined (example) outer diameter part number D tolerance *g m SNT 4/12 SNT SNT SNT SNT SNT 1 1 SNT SNT SNT SNT SNT SNT SNT SNT SNT 12/34 inner diameter d length L material: highcarbon chromium bearing steel (SUJ2)hardness: HV97 (0HRC) or more Tolerances other than *g are available upon request mass kg/m G8

9 NB CENTERLINED TAPPED SHAFT A larger diameter shaft can overcome problems in maintaining precision functionality when a high or unbalanced load is applied. The application of the centerlined tapped shaft together with the SA type support base is ideal in such cases (see SA dimensional table on pages E32 and E33). The centerlined tapped shaft is standardized to simplify selection. part number structure example SNSB material SNB SUJ2 equivalent to SNSB SUS440C length (L) outer diameter (D) ROTARY STROKE N: LKP 2 K: number of pitches NB CenterLined Tapped Shaft outer diameter pitch part D tolerance number g* P m SNB /14 SNB12 12 SNB SNB SNB SNB SNB30 30 SNB SNB SNB50 50 bolt size M M 4 M 4 M 4 M 5 M M M 8 M 8 M 8 M10 tap depth material: highcarbon chromium bearing steel (SUJ2) hardness: HV97 (0HRC) or more *g is standard tolerance for the outer diameter. maximum length Lmax 1,500 1,800 2,000 2,000 3,000 4,000 4,500 5,000,000,000 G9 NB CenterLined Stainless Tapped Shaft outer diameter pitch bolt part D tolerance size number g* P M m SNSB1 1 / M 5 SNSB M 7 SNSB25 25 M 20 SNSB30 30 M 8 SNSB35 35 M 8 9 SNSB40 40 M 8 25 SNSB50 50 M10 tap depth maximum length Lmax 2,000 3,000 4,000 4,500 5,000,000,000 material: Martensite stainless steel (equivalent to SUS440C) hardness: HV13 (5HRC) or more *g is standard tolerance for the outer diameter.

10 SNW TYPE NB Inch Shaft part number structure example SNW 24 h5 0 SNW type size length (L) outer diameter tolerance g when blank straight machined (example) 1in 1in part number SNW 4 SNW SNW 8 SNW10 SNW12 SNW1 SNW20 SNW24 SNW32 SNW40 SNW48 SNW4 outer diameter D tolerance inch g* inch/m 1/ / / / / / / / / /34 length L inch materialhighcarbon chromium bearing steelsuj2 hardnesshv 970HRC or more Tolerances other than *g are available upon request Longer lengths are also available mass bs/inch kg/m kg 2.205bs G10

11 SNWS TYPE NB Inch Stainless Steel Shaft part number structure example SNWS type size straight SNWS 24 1in h5 0 length (L) outer diameter tolerance g when blank machined (example) 1in ROTARY STROKE part number SNWS 4 SNWS SNWS 8 SNWS10 SNWS12 SNWS1 SNWS20 SNWS24 SNWS32 outer diameter D tolerance inch g* inch/m 1/ / / / / / / / /29 materialmartensite stainless steelequivalent to SUS440C hardnesshv 135HRC or more Tolerances other than *g are available upon request Longer lengths are also available length L inch G11 mass bs/inch kg/m kg 2.205bs

12 SNWPD NB Inch PreDrilled Shaft part number structure example SNW 20 h5 72 inch PD SNW type predrilled shaft length (L) size outer diameter tolerance g when blank 1in part number SNW 8PD SNW10PD outer diameter D tolerance inch g* inch/m 1/ / pitch P inch/ bolt size M tapped hole depth Dp inch/ maximum length L inch/ SNW12PD SNW1PD 3/ / ,828.8 SNW20PD SNW24PD 11/ / /118 3/ SNW32PD / / / material : highcarbon chromium beering steelsuj2. hardness : HV 970HRC or more Tolerances other than *g are available upon request Longer lengths are also available 1kg 2.205bs G12

13 SNWSPD NB Inch PreDrilled Stainless Steel Shaft part number structure example SNWS 24 SNWS type size h5 72 inch PD predrilled shaft length (L) outer diameter tolerance g when blank 1in ROTARY STROKE part number SNWS12PD SNWS1PD outer diameter D tolerance inch g* inch/m 3/4 19, , pitch P inch/ bolt size M /420 tapped hole depth Dp inch/ maximum length L inch/ SNWS20PD SNWS24PD SNWS32PD 11/4 31,750 11/2 38, 2 50, / / /118 3/81 1/ ,828.8 material : Martensite stainless steelequivalent to SUS440C hardness : HV135HRC or more Tolerances other than *g are available upon request Longer lengths are also available G13

14 THERMALSPRAYING CERAMICCOATING SPECIFICATION ADVANTAGES: Parts that require wear and corrosion resistance may be thermalsprayed with a ceramic material per NB's ceramiccoating specifications. Material so treated may be used in a wide variety of applications. The pores in the coated layer result in good lubrication characteristics and can be sealed to achieve high corrosion resistance. APPLICATION EXAMPLES: Application of a ceramic coating to oilsealing parts, rollers, and shafts results in good lubrication and high wear/corrosion resistance characteristics. Note: Ceramic coated surface cannot be used as the inner race for a slide bush. REFERENCE: Standard Coated Materials Highcarbon chromium bearing steel (SUJ2) Chrome molybdenum steel (SCM415, 435) Carbon steel for machinery (S45C) Martensite stainless steel (equivalent to SUS440C) Austenite stainless steel (SUS303, 304) Steel alloy for tools (SKS3, SK4) Proper heat treatment is done on your request.thermalspraying ceramiccoating is also available to be applied to other materials. Standard Ceramic for MeltSpray main component specific gravity TiO2 titanium dioxide 4.7 hardness 0HRC characteristics max. temp. 540color: blackwear resistant fine coating fine surface finish thermalspraying layer thickness : Other types of ceramic materials can be thermalsprayed. Contact NB for more information. Example of Ceramic Coating G14

15 MACHINING EXAMPLE NB can fabricate shafts to fit specific customer requirements. Machining/Grinding: Shafts can be machined or ground up to a diameter of and a length of 000. Internal Surface Grinding: The straight/tapered portion of the inner spindle can be ground. Deep Hole Machining: Nonstandard holes can be machined using a gun drill and BT machining methods. (Ref. to Table G.) Table G Deep Hole Machining Range gun drill machining BT machining hole diameter 2 30 Contact NB for maximum length versus hole diameter information. Machining of up to twice the maximum length listed above for doubleside machining. Gun Drill Machining SPECIAL REQUIREMENTS Screw Machining: Triangular and trapezoidal screws can be handled. Compatible Parts: Special nuts compatible with a given shaft may be machined. The inner surface and outer diameter of the tapered portion can be ground. Material and Heat Treatment: NonNB material and nonnb shape parts can be heat treated. Please specify the heat treatment method and hardness. maximum length 850(singleside machining) 0(singleside machining) unit/ ROTARY STROKE G15