Wednesday, August 26, 2015

Nickel sleeve by electro forming

Here we introduce how our nickel sleeves are made.

First we prepare for a mother roll.

This mother roll is placed in basin so that Nickel ions are accumulated by electrolytic deposition on a mother roll surface.  When accumulation reaches the required thickness, this Nickel sleeve is taken out from the mother roll.

Nickel sleeve-fomed process:
Mother roll → Electrolytic deposition → Detached and separated

 This is completely seamless and a cylinder almost same as the mother roll.  These are unique features of Nickel sleeves that welded endless belts cannot compete.  Electrolytic deposition is being improved and heat restiveness is better than the conventional ones and  sometimes we do no find surface defects.
Nicke sleeves manufactured by electrolytic deposition


Wednesday, August 19, 2015

Steel belt, metal belt tracking by crown pulley

Today we further refer to tracking by crown pulleys.

Fig. 1 Crown pulley for steel belt, metal belt

As shown in Fig. 1 , crowning process is done on pulleys when steel belt is used.  'Crown' is a circular arc of curvature radius.  Due to this arc tracking is done.
We often receive questions like 'how much curvature radius is required for a metal belt?'
We reply R=W2/(8×h)
where W is belt width and h= crown height.
Then how can we describe curvature radius like this?
This is led by the Pythagorean theorem.
Please refer to a crown pulley in Fig. 2.
Here a half of W (belt width) is applied to a triangular on the right.

This is deformed to

h2 is much smaller than R.
R is several meters to several hundreds meters, while h is just 1mm or less.
So h2 is described as h2≒0
Then, h=W2/(8×R)

Curvature R is found here.
But how much is the value of h?

In case of plastic belts and rubber belts, pulley d\crown height is set to 0.3mm to several millimeters, depending on belt width and belt thickness.
However, this h is quite limited, quite low in case of steel belts.
It is just 100~200μm when belt with is 500mm.  Curvature radius here is 150 meters!  It requires sophisticated level of process.

However this crowning does not secure tracking.  Sometimes this crown pulley cannot control tracking of metal belts.  This is the very point that metal belt users find difficulty in controlling tracking.
In such cases Dymco listens how the belt is used and present recommendation to each case.
So be free to contact us.

Wednesday, August 12, 2015

Steel belt, metal belt, takt drive conveyor

Stainless steel takt drive conveyor realizes positioning precison tolerance of 50 micron meters.  This tolerance may vary depending on conveyor length.  Howeve it is clear that this order of precision is realized by features of stainless stell belts.  They do not elongate under room temperature.  Thickness and surface smoothness is uniform in the entire belt.

Steel belt, metal belt type intermittent conveyor


Wednesday, August 5, 2015

Functional Film 2015 at Osaka, Japan

Dymco exhibited this film show held on July 28 at Osaka, the western area of Japan as shown in this picture.
Thank you very much for your coming to this show.
DYMCO booth at Functiona Film Show 2015 at Osaka
Displayed are suction or vacum conveyor, intermittent drive conveyor, regular stainless steel belt conveyor (left) and stainless steel seamless sleeve (front)