Comparative Study of Wearing for Titanium Coated Combine Harvester Blades

8/12/2019 Comparative Study of Wearing for Titanium Coated Combine Harvester Blades

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BYDRAGO PARASCHIV, EUGEN ENCULESCU,

ION ANTONESCU, SORIN POPA,

SILVIU LUNGU, CONSTANTIN ROTARIU


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DREVAARC

400


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The functional elementsaffecting the wear condition of

a cutting tool can be divided infour major groups:

1. The stalk plant physicalproperties,2. The interface conditions,3. The cutting tool parameters,4. The dynamic characteristics of

the agricultural machine.


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The main causes of tool wear are: Hard particle wear (abrasive wear). Adhesive wear.

Diffusion wear. Chemical corrosion. Microbiological corrosion. Fracture wear.


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The result is a variety of wearpatterns and scars which can befound at a closer look at the blades

facet and on the flanks of the teeth: Crater wear; Flank wear; Notch wear; Chipping; Ultimate failure.


7/21CUTTING BLADES


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SEM MACHINE


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THE SOLID MODEL OF THE BLADE


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The blade was considered stiff restrained on the inner surface of the rivet holes

THE RESTRAINTS FOR THE FINITE ELEMENT ANALYSIS


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The model of the blade was subjected to two hypothesis of charge in thecontact zone of the blades teeth with the stalk of the plant:

Normal reaction at the median plane. Normal reaction to the teeth facets.

THE LOADS FOR THE FINITE ELEMENT ANALYSIS


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THE RESULTS OF THE FINITE ELEMENT SIMULATION FORRAPESEED HARVESTING

The predicted stress and strain distribution of the blade model:

For the normal reaction at the median plane.

For the normal reaction to the teeth facets.


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THE WEAR PATTERN OF A TYPICAL BLADE AFTER A SIX MONTHSHARVESTING CAMPAIGN


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COMPARISON BETWEEN UNCOATED BLADES AND(TIN) COATED BLADES

Uncoated blades. (TiN) coated blades.

The new blades before mounting on the combine harvester

The same blades after a six months period harvesting campaign

Uncoated blades. (TiN) coated blades.


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We have measured the wear along the edges of the blades usinga photometric scheme .

The recorded patterns of wear for the two sets of blades

Uncoated blades (TiN) coated blades


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The wear height diagrams along the right edges for the two sets of blades

Uncoated blades

(TiN) coated blades


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THE MAXIMUM HEIGHTS OF THE WEAR

Uncoated blades [mm] (TiN) coated blades [mm]

3.111 1.2293.480 1.3334.090 2.1694.941 2.5565.303 5.8603.111 1.229

Medium max. height: 2.629 Medium max. height: 4.185

0

1

2

3

4

5

6

7

1 2 3 4 5

h max [mm]

h med. [mm]

0

1

2

3

4

5

6

1 2 3 4 5

h max [mm]

h med. [mm]

Uncoated blades (TiN) coated blades


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CONCLUSIONS We can observe a certain degree of accordance between the finite

element simulation of stress and strain fields on the solid model of theblade and the wear pattern of blades recorded along a six months periodharvesting campaign.

Both of the zones in which the maximum stresses and strains wereindicated considering the reaction normal to the median plane of theblade (contact zone of the teeth with the stem) and the reaction normal tothe teeth facets (the zone of the ending teeth and of the rivet holes)presented a higher wear rate recorded along a six months periodharvesting campaign.

We have also noticed from the comparative wear study between thetwo sets of five uncoated blades and five (TiN) coated blades mounted on

the same combine harvester along a six month period harvestingcampaign, that the (TiN) coating increases the durability of the blades withalmost 63%.

We have also noticed that the wear pattern of (TiN) coated blades ismuch smoother and the occurrence of catastrophic ruptures is muchreduced then in the case of the uncoated blades.

Documents

Comparative Study of Wearing for Titanium Coated Combine Harvester Blades