Friday, August 17, 2012

On Steel Belt No.14 Welded Endless Belt #4

Above is a figure of stress (S) against the number of cycles to failure (N).
This curve begins to get flat at over one million bendings and becomes flat at over ten million bendings.
Pulley diameter = Belt thickness x 700

Coefficient 700 is set to make the same stress as the one in the chart above so that the belt endures 10 million bendings.

When bendings are not so many,
700 can be 600 or 500
This is to be discussed and adjusted when we decide belt specifications.

Tuesday, August 14, 2012

On Steel Belt No.13 Welded Endless Belt #3

Below is shown relationship between tensile load and elongation.
Steel belts are made by tensile stainless steel.
Tensile metals are stronger than Copper and Low-carbon steel.

But welded area is weak due to heat during welding.

Sunday, August 12, 2012

On Steel Belt No.12 Welded Endless Belt #2

When we try steel belts, we set pulley diameter first.
Pulley diameter = Belt thickness x 700
For instance,
when belt thickness is 0.1mm,
pulley diameter is 70mm.
This is a norm.
Depending on applications,
It may be x 800, or x600, or x400.
The picture below, in our standard conveyor,
Pulley diameter 50mm=Belt thickness 0.15mm x about 350.

Tuesday, August 7, 2012

On Steel Belt No.11 Welded Endless Belt #1

DYMCO employs plasma welding mainly,
which is appropriate for thin stainless steel,
rather than TIG and laser welding.
The picture below is cross section of the welded area in a 0.3mm-thick belt. Half-round stripe areas are melted by welding heat, while Diamond-shaped black points are positions where hardness was checked. In this way we know hardness and other characteristics in steel grades and welding conditions.

Thursday, August 2, 2012

On Steel Belt No.10 Ring-Rolled Endless Belt: Advantage#3

Standard thickness 0.04mm and more is extremely thin for steel belts.  
This enables to use small pulleys in compact design. 
The picture below is an example of 2-stage reducer.