snoozed
Mechanical
- Aug 20, 2021
- 2
Hello all,
I have a steel helical springs with constant pitch. The spring is a tension spring with closed ends. These springs are to be used inside a tank, in a wall scraper assembly to ensure the Teflon scrapers are in contact with the wall due to a constant force acting on it.
The spring after showing peculiar behavior was horizontally stretched between two fixed supports. The surprising part was that the deflection per one coil was not same throughout the spring. That is, the spring with 20 coils, the difference was that one coil had opened 2.3mm but another coil had opened only 1mm at the same force.
Initial thought was that inconsistent heat treatment may be the cause but that only effects the strength, not stiffness of the wire and since it was tested well within the elastic limit of the wire, this idea did not fit.
Upon extensive research that lead nowhere, i am forced to look to you all for guidance
I have a steel helical springs with constant pitch. The spring is a tension spring with closed ends. These springs are to be used inside a tank, in a wall scraper assembly to ensure the Teflon scrapers are in contact with the wall due to a constant force acting on it.
The spring after showing peculiar behavior was horizontally stretched between two fixed supports. The surprising part was that the deflection per one coil was not same throughout the spring. That is, the spring with 20 coils, the difference was that one coil had opened 2.3mm but another coil had opened only 1mm at the same force.
Initial thought was that inconsistent heat treatment may be the cause but that only effects the strength, not stiffness of the wire and since it was tested well within the elastic limit of the wire, this idea did not fit.
Upon extensive research that lead nowhere, i am forced to look to you all for guidance
