Tugas Presentasi PBP

8/10/2019 Tugas Presentasi PBP

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BEARING

Teguh Maulana Hardi1210912042


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Component Definition

Bearing is a component that serves toreduce the angular friction between twoobjects moving relative to each other thatthe shaft with the axis of rotation and pusheach other.


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Component Picture

Bearing


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Work ConditionResistant to high frictionCan accept a maximum loadof 4 KN (SF = 5, then the

maximum load of 20 KN)Maximum wheel rotation6000 rpmHigh temperature resistantResistant to corrosionThe surface of the balls, theouter race and the innerrace are smooth


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Material RequirementsWear ResistantHigh StrengthHigh HardnessCorrosion ResistantHigh Temperature Resistant


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Kind of Material that can be usedto Make a Bearing

Low Alloy Steels AISI 1340 AISI E52100 STEEL SUS440C STEINLESS STELL


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Information & Characteristic ofMaterial

Low Alloy Steels AISI 1340

Information of Material:

Tensile Strength 862-1140MPaHardness 450 BHNComposition 0,38-0,43%C,

1,60-1,90%Mn, 0,040%P,0,040%S, 0,20-0,35%Si

Coefficient of thermalexpansion 7,9x10 -6 (0-

1200oF/

oF)

Characteristic of Material:

1. Good Strength2. Good Hardness3. Good Wear Resistant4. Less Corrosion Resistant5. Good High Temperature

Resistant


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AISI E52100 STEEL

Information of Material : Tensile Strength

2240,79MPa

Hardness 550 BHNComposition 0,98-1,10%C,

0,25-0,45%Mn, 0,025%P,0,025%S, 0,15-0,35%Si

Coefficient of thermalexpansion 9x10 -6 (0-2800 oF/ oF)

Characteristic of Material :1. Very Good Strength2. Very Good Hardness3. Very Good Wear

Resistant4. Less Corrosion Resistant5.

Good High TemperatureResistant


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SUS440C STEINLESS STELL

Information of Material : Tensile Strength 1970 MPaHardness 500 BHNComposition 0,95-1,20%C,

1,00%Mn, 0,04%P,0,03%S, 1,00%Si

Coefficient of thermalexpansion 8x10 -6 (0-2500 oF/ oF)

Characteristic of Material :1. Good Strength2. Good Hardness3. Good Wear Hardness4. Very Good Corrosion

Resistant5.

Good High TemperatureResistance


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Comparison the Three ofMaterials

Material TensileStrength

Hardness Coefficientof thermalexpansion

Low Alloy

Steels AISI1340

1140 MPa 450 BHN 1200 oF

AISIE52100

STEEL

2240,79MPa

550 BHN 2800 oF

SUS440CSTEINLESS

STELL

1970 MPa 500 BHN 2500 oF


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Conclusion

After comparing the three of materials,

so the suitable material that can beused to make a bearing is a AISIE52100 STEEL.


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Question :

How can you get the safety factor is 5?

Are you use the same material for allpart of bearing?


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Answer :I find this SF in my literature, so I cantexplain how SF comes. But in machineelement course we can get safety factor ofany part if we know sigma ultimate, sigmayield, or taw ultimate, depends on what safetytheory do you use. In this case, I cant explainhow SF comes because there is no sigmavalue or taw value.

According to my opinion, for bearing we use

same material because galvanic corrosionwill occurs if we use different material. Wecan use a different material with a smalldifferent number of volta series. So, thismaterial is hard to get galvanic corrosion.


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