fvt infosheets

Dimensioning aids

Where a bearing allows of a low bearing play as regards usage kinematics, the use of our MangaDur®SEAMLESS plain bearings is especially advisable. Due to load changes, the play very quickly causes an increase of the hardness of the bearing surfaces. However, the material surfaces are also hardened in the case of pulsating loads.

For a fi rst rough dimensioning of bearings to be equipped with MangaDur®SEAMLESS plain bearings, some values are provided below. In a particular case, please send us information about your installation situation for an assess-ment:

Properties / requirements:

Design: Homogeneous cross-section, stress zone increases hardness automatically

Admissible load (N/mm²): Stat.: 300 dyn.: 65

Operating temperature (°C): Max. 250

Coeffi cient of friction, unlubricated: Approx. 0.15

Stick-slip effect: Negligible for applications as per the above description

Wearing surface thickness: In principle any, depending on the residual cross-section of the component which is required for structural reasons

Lubrication: Usually no lubrication. If desired, tool life is further extended by keeping away abrasive interburden.

Edge load: Not critical at values in the range specifi ed above; bushing front faces are deformed.Therefore, the design must provide for an appropriate clearance!

Recommendation: For each front face about 0.25 times the bushing wall thickness

Alternating load: Desired to achieve hardness increase

Use in case of longitudinal movement: Use as for slewing bearings

Housing tolerance: Depends on the type of fastening

Counterpart:

Initial bearing play: Approx. 1% of the bolt diameter

Material of the counterface: Quenched and tempered steel

Hardness of the counter-material: > 52 HRc

Surface of the counterface: Of minor importance to the joint function, machine accuracy is suffi cient (approx. 100 µRa).

Together we will work out an individual and fast solution to your technical problems. Often our specialists are involved in projects from the fi rst technical discussion to delivery.

We hope that we could give you a fi rst overview of our competencies. Since we have already satisfi ed the require-ments of many national and international companies, your demands are a challenge we love to face.

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FRIESISCHE VERSCHLEISSTECHNIK GmbH & Co. KG


Am Industriepark 16 · 26670 Uplengen · Tel.: +49 4956 4067- 0 · Fax: +49 4956 4067-19 · [email protected]

www.fvt-gmbh.de WE FORGE QUALITY Made in Germany

MangaDur®SEAMLESS –

THE PLAIN BEARING FOR HEAVY-DUTY ENVIRONMENTS

Direct delivery by manufacturer:

• Recrystallised, fi ne-grained austenitic manganese steel forged structure

(X120Mn12; Hadfi eld Steel; 1.3401)

• Tempered, fi ne-grained forged structure of various quenched and tempered steels such as

1.6582 (34CrNiMo6), 1.7225 (42CrMo4) and 1.8159 (50CrV4)

Other grades available on request.

• Flexible and short delivery times

• Economic advantage

• Bolt shapes

• Round-head bolts

• Square-head bolts

• Horseshoe-head bolts

• Headless bolts, shafts with or without locking devices

• The standard design is with forged, heat-treated and machine-fi nished bolts.

• Different variants of thread ends and cotter pin holes for

different application areas

• Special variants:

• With lubricating holes and

greasing nipples

• Closer tolerances

• Other qualities on request

Your advantage:

• Dimensions as specifi ed by customer

• Accessories such as nuts, cotter pins, locking devices etc. available as kits

• No further processing required after installation

• Many years of manufacturing and design experience

■ BOLTS and SHAFTS

for rotating and oscillating movements

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• Recrystallised, fi ne-grained austenitic manganese steel forged structure

(X120Mn12; Hadfi eld Steel; 1.3401)



• Bushing shapes:

• The standard design of the bushings is rolled, calibrated and austenitised, chamfered on the

outer side and with the ends abutted in parallel to one another:

• Different groove shapes for different application areas

• Special designs:

• With lubricating holes

• Additional inside and outside chamfers

• Closer tolerances

• Other grades on request

Advantage:

• Maintenance-free

• Almost 100% breaking strength

• Dimensions as specifi ed by customer

• Installation preparation as specifi ed by customer

• No processing required after installation


■ CHAIN LINK BUSHINGS (DIN 22267 sheet 5, TGL 4104,

TGL 100-3026) – Plain bearings for very heavy-duty rotating

and oscillating bearing movements

Groove bushing Nose bushing

Spline bushing Bar bushing

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Groove design Locking device Examples of applications

Parallel closed Press-in force New boring Fit H9 - H11Parallel open Press-in force Slightly worn boring, fi tting plate is inserted if necessaryParallel open Press-in force Severely worn boring, fi tting plate is inserted if necessaryParallel open Clamping force New boring provided by material Clamp bushings to DIN 1498Wedge open Clamping force provided Severely worn boringshaped by driven-in wedge Construction site installationParallel closed Nose or distinct bar New boring with groove Fit H9 - H11Parallel open Nose or distinct bar Slightly worn boring with groove, fi tting plate is inserted if necessary


• All intermediate dimensions possible

• Special designs up to 25 mm wall thickness

• Various materials available.

• Optimised to particular application case

• Various strengths due to own heat treatment



• Special types possible:

• Press fi t

• Locking devices (cams, studs, bars)

• Lubrication grooves

• Crowning

• Arrow groove

• Bevel groove

• Beading

• Collar bushings

• Eccentric bushings

Your advantage:

• Bushing automatically retensions if hole widens.

• Easy installation

• Low press-in forces



■CLAMP BUSHINGS (DIN 1498) Plain bearings for

rotating and oscillating bearing movements

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■ MangaDur®SEAMLESS –

THE PLAIN BEARING FOR HEAVY-DUTY ENVIRONMENTS


• Very even recrystallised, fine-grained, carbide-free austenitic manganese

steel forged structure (X120Mn12; Hadfield Steel; 1.3401)

• Cold work hardening results in higher original hardness (approx. 850 to 950 N/mm²)



• Special types:

• Bushing with collar

• Crowned surfaces

• Lubrication grooves

• Lubricating holes

• Flat bearings

• …

Your advantage:

• Maintenance-free

• Eco-friendly as they can be used without lubricant

• Almost 100% breaking strength

• Can be used in dusty, wet and abrasive environments

• Dimensions as specified by customer

• Installation preparation as specified by customer

• Installation by means of shrinking (subcoolable) or pressing


• Low-temperature resistant


The special property of this very ductile material is that its surface hardness is increased due to the operating load and in this way it forms a protective layer against wear. The hardness values that can be achieved are equal to or higher than that of case-hardened or quenched and tempered steel but with a substantially higher ductility.

As a consequence, the excellent properties of the MangaDur®SEAMLESS plain bearing show to advantage with a comparably high service life and extremely long maintenance intervals – usually, no maintenance is necessary at all! If abrasive wear due to hard interburdens occurs during use (e.g. due to dirt, sand with quartz fractions etc. in the surrounding medium), then the hardness increase is renewed again and again due to the load and provided at the currently used surface! So-called friction martensite is created. Despite this, the core below the hardened layer remains ductile!

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• Diameter and length of the bushing/plain bearing as specifi ed by you or

standard dimensions



Your advantage:

• No expensive restoration of the receiving boring to original dimensions

but just one-time reworking of the receiving boring

Process in the past:

• Spindle milling

• Welding (detrimental heat application to steel structure)

• Spindle milling (heavy and diffi cult metal cutting in inhomogeneous weld metal)

• Installation of the bushing / plain bearing with original dimensions

Process in the future:

• Determination and information of the new dimensions to:

[email protected] or telephone +49 4956 / 40 67-0

• Reworking of the receiving boring

• Installation of the bushing / plain bearing with oversize

Many users and manufacturers worldwide are successfully using

MangaDur®SEAMLESS bushings.

■ INDIVIDUAL OVERSIZE BUSHING made of

MangaDur®SEAMLESS for jaw and cylinder pivot points

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fvt infosheets

Documents

bearing surfaces

low bearing play

initial bearing play

machine nished bolts

edge load

load changes

tempered steels

hardness increaseuse