LM Guide SR High-Rigidity Radial Type

Transcription

1 BERG AB Тел. (49)2222, ф. (49)221 LM Guide SR HighRigidity Radial Type Japanese Patent Nos. 1421, 111, and 1921 Utility model registration No LM block End plate Grease nipple End seal LM rail Ball Retainer plate Side seal (optional) Fig. 1 Construction of Model SRW Cross section Construction and Features Balls roll in four rows of a preciselyground raceway on an LM rail and an LM block. The end plate attached to the LM block causes the trains of balls to circulate. As the balls are held in place by the retainer plate, they do Compact and heavyloadbearing Due to its lowprofile, compact design and the 9 ball contact angle in respect to the radial direction, LM Guide SR is best suited for horizontal guideways. Simple establishment of mounting accuracy A selfadjusting type capable of compensating for errors in parallelism between two axes and levelness, SR ensures precision and smooth, lively linear motion. not fall off if the LM block is removed from the rail. The low profile of the assembly and the high rigidity of the LM block combine to provide stable linear motion with a high degree of accuracy. High durability Free from differential slip even under preload or uneven load, the balls roll smoothly. This results in high wear resistance and excellent longterm precision. Stainless steel type available Upon request, we can provide stainless steel LM blocks, rails, and balls. Low noise The guideway on the end plate installed at each end of the LM block ensures the smooth circulation of the trains of balls at turning corners. As a result, the rolling balls generate little noise. A14

2 BERG AB Тел. (49)2222, ф. (49)221 Types and Features Type SRW Type SRV AIV Lowprofile, compact, and strong against radial loads. One of the representative models of the LM Guide. Type SRW modified by shortening the LM blocks; therefore spacesaving Type SRTB Type SRSB Of the same height as type SRW. The LM blocks can be attached to a table from below. Type SRTB modified by shortening the LM blocks; therefore spacesaving A1

3 BERG AB Тел. (49)2222, ф. (49)221 Characteristics of Type SR Compared with a guide with a 4 contact design, type SR features the superior characteristics specified below. By taking advantage of those characteristics, we can produce machines and equipment of higher precision and rigidity. Differences in Load Rating and Service Life Type SR is constructed so as to provide a 9 ballcontact angle. Compared with a 4 contact angle, use of a 9 contact angle results in a different load rating and service life. Compared with products of the same ball diameter, under the same radial load specified below, with type SR the balls are subjected to only % of the load they receive with the 4 contact design. As a result of this difference, the service life is nearly doubled. Contact design of type SR Ball diameter and nominal service life (when number of balls Z = 24) Contact design of type HSR 9 contact design Nominal service life 4 contact design Ball diameter Ball Diameter and Nominal Service Life Fig. 2 Difference in Accuracy Machining (grinding) errors that occur in an LM rail or block affect running accuracy. A grinding error ³ on a raceway results in an error in the radial direction 1.4 times greater in the 4 contact design than in type SR, which features a 9 contact design. In the horizontal direction as well, the error with the 4 design is 1.22 times that with the contact design. Grinding error Grinding error Grinding error Error in the radial direction Grinding error Error in the horizontal direction Top groove side Bottom groove side Contact Design of Type SR Radial direction error Error in the horizontal direction Top groove side Bottom groove side Contact Design of Type HSR Fig. Machining Error and Precision A1

4 BERG AB Тел. (49)2222, ф. (49)221 Difference in Rigidity The 9 contact design applied to type SR differs in rigidity from the 4 design. Under the same radial load P, the deflection in the radial direction with type SR is only % of that with the 4 design. The diagrams below show the differences in radial load and deflection. Therefore, when it is necessary to ensure rigidity in the radial direction, type SR has an advantage over other types. AIV Deflection Deflection in the radial direction Deflection Deflection in the radial direction Fig. 4 Deflection under Radial Load Load and deflection (Da =. mm) for different contact angles (Deflection per ball) Contact angle: 4 Deflection Contact angle: 9 Applied load (N) Fig. Radial Load and Deflection Summary As illustrated above, type SR is best suited for places where the radial load is the main load, radial rigidity is required, and it is necessary to ensure running accuracy in both the horizontal and vertical directions. However, where a large reverseradial or lateral load or a great moment is exerted, we recommend use of a fourway equalload type such as HSR. A1

5 BERG AB Тел. (49)2222, ф. (49)221 Load Rating and Permissible Moment in Various Directions Load rating Reverseradial direction Lateral directions Fig. Radial direction Lateral directions Type SR can bear loads in all four directions: radial, reverseradial, and the two lateral directions. The basic load ratings of type SR is in the radial direction indicated in Fig.. The values are presented in the corresponding dimension tables. Values in the reverseradial and lateral directions can be obtained from Table 1. Equivalent load An equivalent load for type SR when reverseradial and lateral loads are exerted on its LM block simultaneously can be obtained using the following equation: P E = X P L + Y P T where P E : equivalent load (N) In the reverseradial direction In the lateral directions P L : reverseradial load (N) P T : lateral load (N) X and Y : equivalent factor (see Table 2) SR 1 SR 1 Table 2 TypeSR Equivalent Factor P E X Y Equivalent load in the reverseradial direction Equivalent load in the lateral directions Equivalent load in the reverseradial direction Equivalent load in the lateral directions SR 1 SR 1 Table 1 Type SR Basic Load Ratings in Various Directions Direction Radial direction Reverseradial direction Lateral directions Radial direction Reverseradial direction Lateral directions Basic dynamicload rating C C L =.2C C T =.C C C L =.C C T =.4C Basic staticload rating C O C OL =.C O C OT =.4C O C O C OL =.1C O C OT =.C O A1

6 BERG AB Тел. (49)2222, ф. (49)221 Permissible moment In type SR, a single LM block can bear moments in all directions. Table presents the permissible moments in directions M A, M B, and M C for a single LM block and double LM blocks laid over one another (no data for direction M C ). Table TypeSR Static Permissible Moment Direction SR 1V,SB SR 1W,TB SR 2V,SB SR 2W,TB SR 2V,SB SR 2W,TB SR V,SB SR W,TB SR V,SB SR W,TB SR 4W,TB SR W,TB SR T SR T SR1T SRT SR1T Single block M A M B M C Double block Single block Double block Unit: kn m Single block AIV Fig. A19

7 BERG AB Тел. (49)2222, ф. (49)221 Modelnumber coding SR W 2 UU C M + L P M II No. of axes LMrail material (stainless steel in this example) Accuracy grade LMrail length (in mm) LMblock material (stainless steel in this example) Radial clearance Provision of end seals (attached to both end faces in this example; for end seal + side seal, this becomes SS ) No. of LM blocks combined on a single axis Classification of the LM block Note: This coding is based on the assumption of one set of code for a oneaxis unit. (A configuration of two axes installed in parallel is given at least two sets of code.) Radial clearance Table 4 presents the radial clearances of types SR. Table 4 Type SR Radial Clearances Clearance symbol SR 1 SR 2 SR 2 SR SR SR 4 SR SR SR SR 1 SR SR 1 Normal No symbol Under a light preload C Unit : µm Medium preload C Accuracy Standards The accuracy of type SR is divided into five grades, normal, high, precision, superprecision, and ultraprecision, in accordance with the model numbers shown in Table. Fig. Normal grade LMRail length (mm) Fig. 9 Relationship Between LMRail Length and Running Parallelism A1

8 BERG AB Тел. (49)2222, ф. (49)221 SR 1 SR 2 Accuracy standard Item Tolerance for height M Tolerance for the height M difference among LM blocks Tolerance for railtoblock lateral distance W2 Tolerance for railtoblock lateral distance W2 difference among LM blocks Running Parallelism of surface C with surface A Table Type SR Accuracy Standard Normal No symbol ±.1.2 ±.1.2 High H ±..1 ±..1 Precision.... Superprecision P SP UP C (as per Fig. 9) Ultraprecision.... AIV Running parallelism of surface D with surface B D (as per Fig. 9) SR 2 SR SR Tolerance for height M Tolerance for the height M difference among LM blocks Tolerance for railtoblock lateral distance W2 Tolerance for railtoblock lateral distance W2 difference among LM blocks Running Parallelism of surface C with surface A ±.1.2 ±.1. ±.4.1 ± C (as per Fig. 9) Running parallelism of surface D with surface B D (as per Fig. 9) SR 4 SR Tolerance for height M Tolerance for the height M difference among LM blocks Tolerance for railtoblock lateral distance W2 Tolerance for railtoblock lateral distance W2 difference among LM blocks Running Parallelism of surface C with surface A ±.1. ±.1. ±..1 ± C (as per Fig. 9) Running parallelism of surface D with surface B D (as per Fig. 9) SR SR SR 1 SR SR 1 Tolerance for height M Tolerance for the height M difference among LM blocks Tolerance for railtoblock lateral distance W2 Tolerance for railtoblock lateral distance W2 difference among LM blocks Running Parallelism of surface C with surface A ±.1. ±.1. ±..2 ± C (as per Fig. 9).... Running parallelism of surface D with surface B D (as per Fig. 9) A11

9 BERG AB Тел. (49)2222, ф. (49)221 Contamination Protection Types SR is provided with end and side seals as standard contaminationprotection accessories. Scraper Removes spatters and similar large foreign matter. End seal Standard accessory End seal Spacer End seal Fig. 1 Double seal Use two end seals to enhance the contaminationprotection capacity. Fig. Side seal Prevents contaminants from entering an LM block from below. End seal Spacer End seal Side seal Fig. 1 Fig. 11 Inner seal Installed in a LM block. Applicable model Nos.: SR4 and Inner seal Fig. 14 A12

10 BERG AB Тел. (49)2222, ф. (49)221 Contaminationprotectionaccessory symbol Where a contamination accessory is required, specify so using the symbols shown below. Some models do not accept contaminationprotection accessories. Confirm which parts are applicable by referring to Table. Attaching a contaminationprotection accessory to an LM block changes the block overall length. Add to dimension L the increment specified in the corresponding dimension table. Table Contaminationprotection accessory End seal (on both end faces) End seal + side seal End seal + side seal + scraper Double seals + side seal Double seals + side seal + scraper End seal (low seal resistance) LL seal + side seal Symbol UU SS ZZ DD KK LL RR Seal resistance value For the maximum value of seal resistance of seals type SR...UU per LM block, in which grease is applied, see Table. Table Maximum Resistance Value of Seals to Type SR Unit : N Seal resistance value SR 1 2. SR 2.4 SR SR. SR 11. SR 4. SR 1. SR 19. SR SR 1 SR SR 1 AIV Model. No. SR 1 SR 2 SR 2 SR SR SR 4 SR SR SR SR1 SR SR1 Table Applicability of Seals to Type SR, and the Increment to Be Added to the Block Overall Length No symbol UU SS DD ZZ KK LL RR Note: = Applicable = Inapplicable = Applicable, but a grease nipple cannot be attached; contact us A1

11 BERG AB Тел. (49)2222, ф. (49)221 Dedicated Bellows JS for LMGuide Type SR Shown below are the dimensions of dedicated bellows JS for type SR. When ordering the bellows, specify the relevant model number shown in the table below. Boundary dimensions Mounting W H H 1 P b 1 t 1 b 2 t 2 t t 4 bolt a b W/V TB/SB type type A Lmax Lmin Applicable LMGuide model JS M.1. SR1 JS M.1 4. SR2 JS M SR2 JS M4.1 SR JS M.1 1. SR JS M.1 SR4 JS JS M M SR SR Note 1: The expansion ratios in installation directions other than horizontal, e.g., vertical and wallhung, differ from those specified in this table (guidelines: A 1.). When ordering bellows, please specify your installation direction. Note 2: If bellows are attached to both ends of an LM block, a grease nipple cannot be installed there. In such a case, contact us. Modelnumber coding JS /4 Bellows dimensions length when compressed ( length when expanded ) (bellows for type SR in this example) Note: A bellows length can be calculated as shown below. S Lmin = (A 1) Lmax = Lmin A S: stroke length in (mm) A: expansion ratio A14

12 BERG AB Тел. (49)2222, ф. (49)221 DS Bellows Designed for Type SR For types SR1, SR2, and SR2, a bellowstype DS with the features specified below is available. When placing an order, specify model numbers, which are shown below. AIV Features 1. The width and height are smaller than those of conventional bellows. As a result, type DS does not protrude over the top surface of an LM block. The expansion ratio is equal to or greater than that of a conventional bellows. 2. Each ridge of the bellows has a partition plate to prevent the bellows from lifting. As a result, type DS can be used in the vertical, wallhung, and tilted positions.. Excellent highspeed operation, up to as high as m/min. 4. Can be equipped with Velcro, enabling use at any desired length, either by cutting a regularlength product into short sections or by joining more multiple pieces using an adhesive.. As with conventional types, type DS can also be fastened using screws. When doing so, hold the plate (1. mm in thickness) between the LM block and the bellows. Velcro Velcro Partition plate Bonded or screwed DS 1 Boundary dimensions b W H P b 1 t 1 t t W/V 4 d a TB/SB type type max 1 min 2. Expansion ratio A E 2 Factor k 1. Applicable LMGuide model SR1 DS SR2 DS SR2 Note : If bellows are attached to both ends of an LM block, a grease nipple cannot be installed there. In such a case, contact us. Modelnumber coding DS2 /2 Length when compressed / length when expanded (bellows for type SR2 in this example) Maximum length (regular length) as a separate part Lmax (Lmin) = lmax x (lmin) x 2 Calculation example of bellows dimensions When SR1 stroke ls = mm: s Lmin = = (A 1) 4 Lmax = A Lmin = 1 = Hence, the number of crests required is as follows: Lmax n = = = P k 1 1. Lmin = n min + E = = 12 (E = plate thickness; 2 in the present example) Thus, the bellows to be used are DS112/. A1

13 BERG AB Тел. (49)2222, ф. (49)221 LM Cover TPS Designed for Type SR The dimensions of typesrdedicated LM cover type TPS are as shown below. When placing an order, specify by the following model numbers. Table 11 TappedHole Rail Dimensions Effective tapped thread S 1 length 1 SR1 SR2 SR2 SR SR M. M M M M W Boundary dimensions D max H b 1 t 1 b 2 t 2 t t 4 Mounting bolt S Applicable LMGuide model TPS M.1 SR2 TPS M4.1 SR TPS M.1 SR TPS M.1 SR4 TPS M SR No. of sectors min L max Stroke No. of sectors min L max Stroke 2 9 TPS TPS TPS TPS TPS Modelnumber coding 1 Note : If bellows are attached to both ends of an LM block, a grease nipple cannot be installed there. In such a case, contact us. TPS 4/14 Lmax (cover length when expanded) Lmin (cover length when compressed) Model number (for SR) A1

14 BERG AB Тел. (49)2222, ф. (49)221 Precautions on Use MountingSurface Height and Corner Profile Normally, mounting surfaces for LM blocks and rails have lateral reference surfaces to aid in positioning rails and blocks with a high degree of accuracy. For the referencesurface shoulder height, see Table 9. Furthermore, provide enough space to the corner profile of a mounting surface so that the corner does not interfere with chamfers made on the LM blocks or rails, or provide the corner with a radius smaller than corner radius r specified in Table 9. Fig. 1 Table 9 MountingSurface Shoulder Height and Corner Radius SR 1 SR 2 SR 2 SR SR SR 4 SR SR SR SR 1 SR SR 1 Corner radius r (max.) LMrail shoulder height H LMblock shoulder max. height H E AIV A1

15 BERG AB Тел. (49)2222, ф. (49)221 LMRail Standard and Maximum Lengths Table 1 presents the standard and maximum lengths of LM rails for type SR. If your maximum length is not within the range of this table, we offer special LM rails intended for connected use. For dimension G when a special length is specified, we recommend those listed in Table 1. A large dimension G tends to reduce stability at the shaft ends, which may degrade accuracy. For connected use, we offer LM rails that ensure the elimination of level differences at joints. Therefore, when placing an order, please specify the overall length of the LM rails you require. LMrail standard length (L) Standard pitch F G Max. length A1 Table 1 TypeSR LMRail Standard and Maximum Lengths SR1 SR2 SR2 SR SR SR4 SR SR (4) (14) (22) (22) (22) Notes: In special cases in which connected use is impossible but one of the maximum lengths specified here is required, contact us. Model numbers SRT and above are semistandard. If any of these products are required, contact us. The maximum length differs by accuracy grade. Contact us for details Numbers in parentheses indicate the maximum lengths of stainless steel types.

16 BERG AB Тел. (49)2222, ф. (49)221 TappedHole Rail Models of Type SR Type SR includes models with rails that do not have mounting bolt holes, and are instead provided with tapped holes drilled into the rail bodies from below. These models are useful where rails are to be bolted from below the base, and enhance the effect of contamination protection. AIV Clearance Table 11 TappedHole Rail Dimensions Effective tapped thread S 1 length 1 SR1 SR2 SR2 SR SR SR4 SR M. M M M M M M Tappedhole rail models of type SR are produced only at the highaccuracy grade or below. 2. Set a bolt length that leaves a clearance of 2 to mm at the tip of each bolt when the bolt is tightened over the full length of the effective tapped thread (diagram shown above).. Modelnumber coding SR W2UU + 1LH K Tap type symbol 4. For the standard tapping pitch (F), see Table 1 on page A1. A19

17 BERG AB Тел. (49)2222, ф. (49)221 SRW and SRWM Type SRV and SRVM Type Standard type Stainlesssteel type SR W Type (Heavyload type) SR V Type (Mediumload type) Height M External dimensions Width W Length L LMblock dimensions B C S L 1 T K N E *SR 1 W/WM *SR 1 V/ VM M *SR 2 W/WM *SR 2 V / VM M *SR 2 WY/WMY *SR 2 V Y/ VMY 4 M *SR W/WM *SR V / VM M *SR W/WM *SR V / VM M SR 4 W M SR W 1 1 M SR T SR T SR 1 T M1 2 M SR T M SR 1 T M Notes: An M in a model number indicates that the corresponding LM blocks, rails, and balls are made of stainless steel and are therefore corrosion and environmentresistant. For products marked with a *, stainlesssteel end plates are available in cases in which they are to be used at C or higher. Model numbers SRT and above are semistandard. If any of these products are required, contact us. For permissible static moments M A, M B, and M C, see page A19. A19

18 BERG AB Тел. (49)2222, ф. (49)221 (E) AIV SR W Type (Heavyload type) SR V Type (Mediumload type) Grease nipple Width Height W 1 W ±. 2 M 1 PB1B BMF BMF BMF BMF LMrail dimensions Basic load rating Mass Pitch F d 1 d 2 h C kn C kn LM block kg LM rail kg/m BPT1/ BPT1/ BPT1/ APT1/ APT1/ BPT1/ BPT1/ For standard LMrail lengths, see page A1. For modelnumber coding, see page A1. SRT and SR1T are provided with a grease nipple on the sides of their LM blocks. A191

19 BERG AB Тел. (49)2222, ф. (49)221 SRTB and SRTBM Type SRSB and SRSBM Type Standard type Stainlesssteel type SR TB Type (Heavyload type) SR SB Type (Mediumload type) *SR 1 TB/TBM *SR 1 SB/SBM *SR 2 TB/TBM *SR 2 SB/SBM *SR 2 TBY/TBMY *SR 2 SBY/SBMY *SR TB/TBM *SR SB/SBM *SR TB/TBM *SR SB/SBM SR 4 TB Height M External dimensions Width W Length L LMblock dimensions B C S L 1 T K N E SR TB Notes: An M in a model number indicates that the corresponding LM blocks, rails, and balls are made of stainless steel and are therefore corrosion and environmentresistant. For products marked with a *, stainlesssteel end plates are available in cases in which they are to be used at C or higher. For permissible static moments M A, M B, and M C, see page A19. A192

20 BERG AB Тел. (49)2222, ф. (49)221 (E) AIV through through SR TB Type (Heavyload type) SR SB Type (Mediumload type) Grease nipple PB1B Width W 1 ±. 1 W 2 1. LMrail dimensions Basic load rating Mass Height M 1. Pitch F d 1 d 2 h. 4. C kn C kn LM block kg.2.1 LM rail kg/m 1.2 B MF B MF BMF BMF BPT1/ BPT1/ For standard LMrail lengths, see page A1. For modelnumber coding, see page A1. A19

21 BERG AB Тел. (49)2222, ф. (49)221 A194