xez super precision bearing

WUXI No.2 BEARING CO.,LTD ADD: No.1 LIJIANG ROAD, NEW DISTRICT,WUXI,214028 CHINA TEL:+86(510)68937980 Mobile：+86-15961897823 FAX:+86(510)85217940 www.xezchina.com

XEZ bearing with ultra-precision, ultra-high speed performance,widely used in machine tool spindle, electric spindle, ball screw, and other precision machines.

Features: High precision, high speed,low temperature rise,low noise, long life. Recommended type: 70 series(H70),72 series high-speed angular contact bearing Such as: 7002C 2RZ P4 HQ1 XEZ, 7205C 2RZ P4 HQ1 XEZ

Features: High precision, high speed,low temperature rise,low noise, long life. Recommended type: 70 series,72 series high-speed angular contact bearing Such as: H7005C 2RZ P4 HQ1 XEZ.

Features: High precision,low temperature rise,long life. Recommended type: 70 series,72 series,719 series high-speed angular contact bearing, NN30 series cylindrical roller bearing. Such as: 7012C TYNSUL P4 XEZ,7014A5 TYN SUL P4 XEZ.

Features: Carrying heavy Axial loads,high accuracy. Recommended type: BS series,760 series,TAC series ball screw bearings Such as:30TAC62B SUC 10PN7B XEZ, BSB040090 TN1 P4 GB.

Features: Simultaneously acting radial and axial loads,medium load carrying capacity. Recommended type: 72 series angular contact ball bearing with AC or B angle. Such as: 7201AC DF P5 XEZ,7204AC DF P5 XEZ

Features: High load carrying capacity，medium speed,long life. Recommended type: 72 series,73 series angular contact ball bearing with AC or B angle. Such as: 7213B DFB P5 XEZ,7314BECBM P5 XEZ.

Features: High speed,high precision,High Temperature Resistance,High Durability. Recommended type: 70,72,73 series,60 series,BN17,BN25 bearings of chemical fiber textile machinery. Such as: 7205CTPA/P4,BN25-10TVV/P43

Standard type: 718 series, 719 series, 70 series, 72 series

Features: �Contact Angle: 15°, 25°; �Cage Material: Phenolic(T), Polyamide(TN); �Ball Material: Steels or Silicon Nitride Ceramic; �External design:Open,Sealed; �Accuracy: P5,P4,P2; �Matched bearings:SU&GA,DT&DB and any matching

Features: �Contact Angle: mainly provide high speed bearing with C angle(15°), �Cage Material: Phenolic(T), Polyamide(TN) �Ball Material: Steels or Silicon Nitride Ceramic �External design:Open,Sealed �Accuracy: P5,P4,P2 �Matched bearings:SU&GA, DT&DB and any matching.

High-speed type: H719 series,H70 Series

Improved Type:B70 series Features: �Contact Angle: mainly provide improved high-speed bearing with C angle(15°). �Cage Material: Phenolic(T). �Ball Material: Steels or Silicon Nitride Ceramic. �External design: mainly Open �Accuracy: P4,P2 �Matched bearings:SU&GA DT&DB and any matching.

BAR& BTR series

Features: �High-speed Angular Contact Thrust Ball Bearing ; Contact Angle:BAR series is 30°,BTR series is 40° �Cage Material:Polyamide(TN) �Ball Material: Steels or Silicon Nitride Ceramic �External design:Opened �Accuracy: P4 �Matched bearings: provide SUL,DBL,DBBL.

Features: �Standard Angular Contact Thrust Ball Bearing ; �Contact Angle:40° �Cage Material:Polyamide(TN),Brass(M) �Ball Material: Steels or Silicon Nitride Ceramic �External design:mainly Opened,Sealed is available; �Accuracy: P5,P4 �Matched bearings: provide GB,DB,DT,DF.

7200 B series, 7300 B series

Features: �Loads: mainly acting radial loads; �Rolling element: short Cylinder; �Bores: Cylindrical,Tapered(K); �Lubrication hole in the outer ring can be provided(W33); �Cage Material:Mainly Brass(M),also provide Polyamide(TN); �Accuracy: P5,SP,P4;

Ball Screw Support Bearing series3.1 760 series; 3.2 BSB&TAC series Features: �Used in standard ball screw bearings; �Contact angle:60°; �External design:mainly Opened,Sealed is available; �Cage Material:Polyamide(TN); �Accuracy: P5, P4; �Matched bearings: provide GB universaland any matching;

NN30**K/W33 series

Designation System

Precision angular contact ball bearing-718 series(Standard) a=15º，25º

Structure

Bearing Type

Designation of size series

Inner Diameter

Contact Angle

Cage Material code

Preload

Matching

Precision

Rolling element Material

Seals

ID：10-150mm

TypeDimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min) Sealed

Grease Oil Grease Oil

Structure

Bearing Type

Size series

Inner diameter

Contact angle

Cage Material

Seals

Rolling element

Precision

Matching

Preload

Remarks

-:Standard high-speed; B:Improved high-speed; H:ultra-high speed

7: Single row angular contact ball bearing

18:18 series;19: 19 series; 0:10 series; 2:02 series

ID:under 03: 00:10mm; 01:12mm; 02:15mm; 03:17mm; ID equal to or more than 04=ID code x 5(mm)

C:15°;AC:25° T: Polymer cage, guided by the outer ring; TN:Polyamide cage, guided by the rolling elements

- : Open;2RZ: non-contact rubber seals

- :Steel(GCr15); HQ1:Silicon Nitride Ceramic(Si3N4); SQ: Stainless Steel(9Cr18)

P2: ISO2 class; P4:ISO class; P5:ISO5;P4Y:Size Accuracy ISO4, rotating accuracy ISO2

G:Universal; DU:Two universal bearings as a set;DB: back-to-back;DF: face-to-face;

A:Light preload;B:Medium preload;C:Heavy preload; CA:Light clearance;CB:Medium clearance; CC:Heavy clearance

Precision angular contact ball bearing-719 series(Standard) a=15º,25º


18


ID:10-150mm

TypeDimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)

Sealed

18

TypeDimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)

SealedGrease Oil Grease Oil

ID:6-150mm

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min) SealedGrease Oil OilGrease

Grease Oil Grease Oil Grease Oil Grease Oil


Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)Sealed Type

Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min) SealedGrease Oil Grease Oil

ID:10-150mm


TypeDiemensions（mm） Load Rating(KN) Limited Speed(r/min)Ceramic ball(r/min) Sealed


Precision angular contact ball bearing-H719 series(Ultra-high Speed) a=15º,25º

Precision angular contact ball bearing-H70 series(Ultra-high Speed) a=15º,25º

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min)Ceramic ball(r/min) SealedGrease Oil Grease Oil



1818

ID:10-130mm

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)

Grease Oil Grease OilSealed

ID:6-130mm

Precision angular contact ball bearing-B70 series(Improved：used in fog lubrication) a=15º

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)Sealed


28000

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min) SealedGrease Oil Grease Oil

ID:10-60mm

TypeDimensions(mm) Load Rating(KN) Limited Speed(r/min) Sealed

Grease Oil

Designation system

Angular Contact Thrust Ball Bearing- BAR BTR Series BAR Angle: 30º, BTR Angle: 40º

Bore diameter

Bearing Type


Materials Symbol

Preload

Matching

Precision

Cage Material

Bore diameter Bore diameter(mm)

Bearing Type BAR:angle 30º; BTR:angle 40º Size series 10:10 Series except width diameter

Materials Symbol

SymbolMaterials

Material of inner and outer rings Material of Rolling elements

Cage Material M: Brass;TYN:Polyamide 46；TN:Polyamide 66, guided by the rolling elements

Precision P2A: P2 tolerance except OD; P4A: P4 tolerance except OD;

Matching G:Universal;DU:Two universal bearings;DB:Back-to-back;DF:Face-to-face; DT:Tandem

Pre-load EL:Slight preload;L:Light preload; CP: Special clearance of pre-load;CA: Special axial clearance;

Remark

ID:50-150mm

Type Dimensions(mm) Load Rating(KN)

Coa Ca

Max axial Loading (KN)

Acting Position a(mm)

Weight (Kg)

Limited Speed(r/min)

Grease Oil

Angular Contact Thrust Ball Bearing- 7200B 7300B Series a=40º

105

Type Dimensions(mm) Load Rating（KN）

Coa Ca

Max axial Loading (KN)

Acting Position a(mm)

Weight（Kg）

Limited Speed(r/min)

Grease Oil

Bearing Type


Bore diameter

Contact Angle

Seals

Pre-load

Matching

Precision

Cage

01:12mm;

Bearing Type

Size Series

Bore diameter

Contact Angle

Seals Cage

Precision

Matching

Pre-load Remark

7:Single row angular contact ball bearing

18:18 series; 19:19 series; 0:01 series ;2:02 series; 3:03 series

ID:under 03: 00:10mm; 01:12mm; 02:15mm; 03:17mm; ID equal to or more than 04=ID code x 5(mm)

B:40º

-: Open ; 2RZ: non-contact rubber seals; 2RS: Contact rubber seals

TN: Polyamide cage, guided by the rolling elements ; M: Brass cage

P2:ISO2; P4:ISO4; P5: ISO5

G:Universal; DU:Two universal bearings as a set;DB: Back-to-back;DF: Face-to-face;

A:Light preload;B:Medium preload;C:Heavy preload; CA:Light clearance;CB:Medium clearance; CC:Heavy clearance

ID: 10-150mm

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min)

Grease Oil

Designation System

52

TypeDimensions(mm) Load Rating(KN) Limited Speed(r/min)

Grease Oil

Bearing type


Bore Diameter

Seals

Pre-load

Matching

Precision

Cage

Bearing Type

Size series

Bore diameter

Seals

Cage

PrecisionMatching

Pre-load

76: Angular Contact Thrust Ball Bearing with 60°contact angle

02:Size series 02; 03:Size series 03

025: ID �25mm

-: Open ; 2RZ: non-contact rubber seals; 2RS: Contact rubber seals

TN:Rolling element riding Polyamide cage

P2:ISO2; P4:ISO4; P5: ISO5G:Universal; DU:Two universal bearings;DB:Back-to-back;DF: Face-to-face;

A:Light preload;B:Medium preload;C:Heavy preload;

Remarks

Ball Screw Support Bearing 760 Series a=60°

Designation System

Ball Screw Support Bearing BSB Series a=60°

ID:12-100mm

TypeCorresponding Code

Dimensions(mm) Load Rating(KN) Limited Speed(r/min)

Sealed

Bearing Type


Bore Diameter

Seals

Pre-load

Matching

Precision

Cage

Bearing TypeSize series

Bore DiameterSeals

CagePrecision

MatchingPre-load

BSB:Angular contact thrust ball bearings(60°contact angle) for ball screw

025: ID �25mm

062: OD �62mm-: Open ; 2RZ: non-contact rubber seals on both sides; 2RS:seals on both sides

TN:Polyamide cage, guided by the rolling elements

P2:ISO2; P4:ISO4; P5: ISO5

G:Universal; DU:Two universal bearings;DB:Back-to-back;DF:Face-to-face; A:Light preload;B:Medium preload;C:Heavy preload;

Remarks

ID:15-100mm

Type NSK CodeDimensions(mm) Load Rating(KN) Limited

Speed(r/min) Sealed

Designation System

Double Row Cylindrical Roller Bearing NN30 Series

Bearing Type


Bore Diameter

Tapered Hole Code

Precision

Radial Clearance

Oil hole

Cage

Bearing Type

Size series

Bore Diameter Tapered Hole Code

CageOil hole

Radial Clearance

PrecisionRemarks

NN: Double Row Cylindrical Roller Bearing(Inner Ring with Ribs)

30: 30 Series ID=Bore diameter code x 5(mm)

- : Cylindrical Bore ; K: Bearing with tapered bore, taper 1:12

TN:Polyamide cage, guided by the rolling elements ; M: Brass cage

- : No hole; W33: oil groove and lubrication holes in the outer ring

C1:Less than C2;C2:Less than normal;CN:greater than normal;C3: greater than C3;

SP: standard precision; UP: super precision

ID: 35-150mm

Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) WeightGrease Oil

Our company specializes in develope and produce special bearings for chemical fiber and textile machinery, with high-speed, precision, high reliability, long life. Maintain and replace bearing for chemical fiber equipment, high-speed spinning winder, texturing, winder, Twister, silk machines, weaving, printing machine, and supply standard and non-standard special bearings for equipment manufacturers.

Special Bearings:It's developed and designed according to the installation and work condition of chemical fiber textile machinery; Speed:12000r/min-2400r/min; Working life: Continuous running more than 9000 hours; Features: High speeds, super precision,high reliability,heat-resistant, Fatigue resistance;

TypeDimensions(mm)

ID OD WApplications Bearing&Structure Installation

postion

TypeDimensions(mm)

ID OD WApplications Bearing&Structure Installation

position

参考表格8

To prevent dust and rust during the transport and stored, the bearing surfaces will be coated with anti-rust oil before shipment. Please remove the oil and clean bearing after unpacking.

◆Check shaft and Housing. Shaft and housing should be cleaned. It's not allowed to scratch, burr, burrs, etc on the surfaces of bearings and spacers. Check the shaft and bearing sizes, make sure compliance with the bearing inner diameter tolerances Measuring should be done in constant temperature room, using a micrometer or dial bore gauge to measure when the temperature of the measured object in a steady state(Multi-point measurement and check whether there is a size out-of-tolerance obviously)

The method of mounting rolling bearings strongly affects their accuracy, life, and performance, so their mounting deserves careful attention. Their characteristics should first be thoroughly studied, and then they should be mounted in the proper manner. Bearing mounting methods depend on the bearing type and type of fit. As bearings are usually used on rotating shafts, the inner rings require a tight fit. Bearings with cylindrical bores are usually mounted heating them to expand their diameter, the temperature 38°to 45°C . Bearings are usually mounted in housings with a loose fit. However, in cases where the outer ring has an interference fit, a press may be used. Bearings can be interference-fitted by cooling them before mounting using dry ice. In this case, a rust preventive treatment must be applied to the bearing because moisture in the air condenses on its surface. 1.Press Fits Fitting with a press is widely used for small bearings. A mounting tool is placed on the inner ring as shown in Fig, and the bearing is slowly pressed on the shaft with a press until the side of the inner ring rests against the shoulder of the shaft. The mounting tool must not be placed on the outer ring for press mounting, since the bearing may be damaged. Before mounting, applying oil to the fitted shaft surface is recommended for smooth insertion. The mounting method using a hammer should not be used. 2.Shrink Fits Since press fitting large bearings requires a large force, a shrink fit is widely used. The bearings are first heated in oil to expand them before mounting. This method prevents an excessive force from being imposed on the bearings and allows mounting them in a short time.

Because of the structure of Angular contact bearings, single bearings only can carry loads in one direction,so the external load is applied to only this side when mounted to the shaft and housing, rather than the other side. When install combined bearings into shaft and housing,the installed sequence for DT&DB is different. It is important to note. In the high speed and precision spindle, To prevent imbalance due to nut tilt and thread gap when using nut tightening, shaft sleeve fixed method will be applied. It's fixed by the interference between shaft and inner diameter of sleeve. But if use this methods, the bearing is easier to loose in continuous operation, it must be checked periodically. Placed a wide spacer between the combination of angular contact ball bearings,if the nut tightening force is too large, will cause deformation of the inner ring spacer, resulting preload is greater than the set value. So they should be mounted in the proper preload.

The filling sequence of grease after cleaning. Lubricant filling is importance for the performance of bearing，it affects temperature rise,initial run-in period,even causes burns. So using the appropriate grease and quantity to fill in correct manner Therefore, according to the operating conditions, bearings are filled with the appropriate grease and quantity in correct manner. The following filling methods are recommended: ◆Check requirements before filling. Ensure no dirt in the bearing. For the high speed spindle bearing, we suggest that, clean and degrease at first, then fill grease. for others applications, also must to clean the anti-rust oil in bearing. ◆The grease quantity. Angular contact ball bearing for high speed spindle — 15% ±2% of the free space in the bearing. Cylindrical roller bearing for high speed spindle — 10% ±2% of the free space in the bearing. ◆Filling for Angular contact ball bearing (1) Fill the grease evenly between each ball. If for the bearing with Bakelite cages,should coated with a thin layer of grease on rolling surface of cage. (2)In order to the grease to be evenly distributed within the bearing, should rotate the bearing by hands. ◆Filling for Cylindrical roller bearing. (1) Coated with 80% grease on rolling surface of rollers, here, shouldn't fill too much grease on the inside of cage. That's because the grease will be difficult to spread, resulting in the rising of temperature will rise and increasing of the running-in time. (2) The grease on rolling surface will spread into the end of rolling, the contact surface between cage and rolling and the entrance of hole, the grease would to be evenly distributed within the bearing. (3)Evenly Coated with remaining 20% grease on outer ring raceway surface of housing.

◆Check the spacer Spacer Parallelism of spacer on spindle should be controlled within 0.003mm(3�m),poor parallelism will cause bearing tilt, resulting in poor precision, noise and other problems.

Cleaning The Bearings And Related Parts

Cleaning Dimension of Related Parts

Mounting Procesures

Precautions For Mounting

Procedure For Packing Grease After Cleaning Bearings

◆Running Accuracy In order to improve the precision of spindle. On the basis of precision of parts, must improve the precision of operation. ①The axial runout of outer ring end face Lightly tap the outer ring side face, controlled in 0.002mm ②Perpendicularity of bearing Control the inclination of shaft in 0.005mm by adjust the nuts. ③Concentricity of housing. Be Controlled in 0.010mm If can't reach above accuracy,must dismounting to recheck the precision of parts.

Powered operation should be started slowly without load and the operation should be observed carefully until it is determined that no abnormalities exist, then gradually increase the speed, load, etc. to their normal levels. Items to be checked during the test operation include the existence of abnormal noise, excessive rise of bearing temperature, leakage and contamination of lubricants, etc. If any abnormality is found during the test operation, it must be stopped immediately and the machine should be inspected. If necessary, the bearing should be dismounted for examination. Although the bearing temperature can generally be estimated by the temperature of the outside surface of the housing, it is more desirable to directly measure the temperature of the outer ring using oil holes for access. The bearing temperature should rise gradually to the steady state level within one to two hours after the operation starts. If the bearing or its mounting is improper, the bearing temperature may increase rapidly and become abnormally high. The cause of this abnormal temperature may be an excessive amount of lubricant, insufficient bearing clearance, incorrect mounting, or excessive friction of the seals. In the case of high speed operation, an incorrect selection of bearing type or lubricating method may also cause an abnormal temperature rise. The sound of a bearing may be checked with a noise locater or other instruments. Abnormal conditions are indicated by a loud metallic sound, or other irregular noise, and the possible cause may include incorrect lubrication, poor alignment of the shaft and housing, or the entry of foreign matter into the bearing. The possible causes and countermeasures for irregularities are listed in following Table.

◆Control of Preload after Mounting of Bearings If the preload of rolling bearing is set larger, the rigidity of bearing is increased, but heat generation is also increased, and in extreme cases, seizure may occur. Therefore, it is necessary to control optimum preload carefully in response to operating condition.

After the mounting has been completed, a running test should be conducted to determine if the bearing has been mounted correctly. Small machines may be manually operated to assure that they rotate smoothly. Items to be checked include sticking due to foreign matter or visible flaws, uneven torque caused by improper mounting or an improper mounting surface, and excessive torque caused by an inadequate clearance, mounting error, or seal friction. If there are no abnormalities, powered operation may be started.

Irregularities Possible cause Countermeasures

Noise

Loud metallic sound

Abnormal load

Incorrect mounting

Insufficient or improper lubricant

Contact of rotating parts Dents generated by foreign matters,corrosion,flaws,or scratches on raceways Brinelling

Flaking on raceway

Excessive clearance

Penetration of foreign particles

Flaws or flaking on balls

Improve the fit,internal clearance, preload, position of housing shoulder,etc. Improve the machining accuracy,alignment of shaft&housing,accuracy of mounting method. Replenish the lubricant or select another one.

Modify the labyrinth seal,etc.

Replace or clean the bearing,improve the seals,and use clean lubricant. Loud regular

sound

Irregular sound

Replace the bearing,and use care when handling Replace the bearing.

Improve the fit,clearance,and preload.

Replace or clean the bearing,improve the seals,and use clean lubricant.

Abnormal temperature rise

Insufficient or improper lubricant

Abnormal load

Incorrect mounting

Creep on fitted surface, excessiveseal friction

Replenish lubricant or select a better one. Improve the fit,internal clearance,preload,or position of housing shoulder.

Improve the machining accuracy and alignment of the shaft and housing, accu-racy of mounting,or mounting method. Correct the seals,replace the bearing,or correct the fitting or mounting.

Replace the bearing.

Vibration (Radial runout of shaft)

Brinelling

Flaking

Incorrect mounting

Penetration of foreign particles

Replace the bearing and use care when handling bearing. Replace the bearing. Correct the squareness between the shaft and housing shoulder or side of spacer.

Replace or clean the bearing,improve the seals.

Leakage or discoloration of lubricant

Too much lubricant. Penetration by foreign matter or abrasion chips

Reduce the amount of lubricant,select a stiffer grease.Replace the bearing or lubricant.Clean the housing and adjacent parts.

Inspection After Mounting

Operation Inspection

Items Type XEZ code SKF NSK FAG SNFA

Triple:

Double:

Quadruple:

Series

Precision

Contact Angle

Matching

Pre-load

Ultra light series

Super light series

High-speed Super light seriesLight Series

High-speed Light Series

Standard Series

15°

25°

Universally Matchable

Light

Medium

Heavy

xez super precision bearing

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