Please click for content. - Orhan Holding
Please click for content. - Orhan Holding
Please click for content. - Orhan Holding
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Euro 5 changement and hot pin applications<br />
The effects of environmental pollution and global warming<br />
are seen through the eyes in recent years and<br />
environmental consciousness is getting more and more<br />
importance day by day.With the acceptance of Kyoto<br />
protocol which focuses on global warming and climate<br />
cahnges , each country and each sector had to have<br />
responsibilities on environment.<br />
Considering that more than one billion vehicles on road<br />
every day; exhaust gases has very large impact on<br />
environmental pollution .When fuel is conbusted <strong>for</strong> an<br />
engine; nitrogen oxides (NOx), Carbon oxides (COx),<br />
Hydrocarbons (HC) and particle materials are released<br />
with in the exhaust gas<br />
• Nitrogen Oxide (NOx): is the result of high temperature<br />
combustion, mixed with water and turns into acid rain.<br />
• Carbon Monoxide (CO): is released as a result of<br />
inefficient conbustion. It is colorless, odorless and not toxic<br />
irritant gas.But it has much more powerfull greenhouse<br />
effect.<br />
• Hidro Karbon: It is released with unburned fuel.<br />
• Particle materials (PM): are smaller than 2,5 μm, and<br />
filled bronchus.<br />
Because of that automotive sector is started to work<br />
towards raducing emisyon gases with Euro 1 (1993) and<br />
continue job by stages.<br />
As Nobel Automotive , our products are fuel lines and<br />
surely we have to develope our products com<strong>for</strong>ming to<br />
Euro normes.<br />
For the Euro5 changement, our serial raw materials PA11,<br />
PA12 replaced by harder, lower permeability and high<br />
per<strong>for</strong>mance material MLT 4300, MLT4540, EVX which<br />
includies EVOH .<br />
Banu YILMAZ<br />
Project Engineer<br />
21<br />
But this new raw material has been brought new quality<br />
risks.Different type of cracks has been detected after<br />
assembly process. After all analysis EVOH layer has been<br />
determied as a reason of this type of deffects.<br />
Becuse of we needed to improve our assembly process.<br />
Most important improvement is called as Hot Pin<br />
application.<br />
Simply hot pin application is a attached speciality <strong>for</strong> flaring<br />
operation. Flaring operation must be done by two steps.<br />
First tube must be pre-heated on the pin by contact. This<br />
step prepares the material to be elongated by reducing<br />
EVOH layer stiffness and breakability. Time <strong>for</strong> this step<br />
can be very short, because heat conduction is very fast by<br />
contact (necessary to be defined) .<br />
In a second time, flaring and penetration of the pin can<br />
begin.If the pin moves back between the two steps, due to<br />
cinematic choice of conception, speed limitation must be<br />
applicated just be<strong>for</strong>e contact to reduce the shock between<br />
tube and pin..<br />
We had good quality results with this type of flaring<br />
operation and we keep continue working to improve this<br />
heating system and efficienty.<br />
Hot pin assembly unit<br />
First<br />
level<br />
Second<br />
level