Hei.
jeg husker for en ti års tid siden så var dette noe som man bare måtte gjøre for å være kongen på haugen hvis man bygde custom rifler med maks presisjon. etter denne perioden på 1990 tallet så har dette mer eller mindre gått i glemmeboken og er ikke diskutert i det hele tatt i dag. var dette bare en mote ting eller kan man merke noen forbedring av presisjonen med slik behandling?
er dette først og fremst noe man bør vurdere på rifler som har ett presisjonsproblem eller er det noe som alle bør gjøre med riflene sine? kansje spesiellt for match og 5 klasse skyttere i DFS?
hva er kostnadene for å gjøre dette med en rifle?
Håper det er noen med fagkompetanse som kan gi en orientering om emnet.
jeg fant dette på nettet:
Cryogenics is the study of how materials react at very low temperatures - usually bellow -180 C. This figure was chosen as a dividing line since the boiling points of 'permanent gases' such as helium, hydrogen, neon, nitrogen and oxygen, are all below -180 C, while the boiling points of the Freon refrigerants are above -180 C.
The History of Cryogenic Stress Relief
One of the most important breakthroughs in the field of cryogenics occurred in 1945, when scientists discovered that materials frozen to very low temperatures showed more resistance to long term wear. This discovery lead to the founding of the CryoTech company, who specialized in cryogenic processing by Ed Bush, in 1966.
Cryogenic Processing and Stress Relief
Cryogenic stress relief is very effective in relieving stress from parts before, during, and after machining. This stress relief process is very thorough, assuming that the warm up process is very slow and deliberate. If you rush the process, you end up re-introducing residual stress back in to the parts.
Metal parts, castings, forging, plastica, and composite materials all respond well to cryogenic processing. It is a non-destructive process, which does not affect the carbon content of steel, and leaves any surfaces clean and free of oxides. Unlike heat stress relief, there is no discoloration. The process essentially deadens the stress in welded or machined components, and can make a big difference to the durability of parts requiring intricate machine processing.
Aluminum can benefit from cryogenic stress relief, as can non-ferrous metals. They become stronger and tougher as a result of the densification of their molecular structure, making them as close to stress-dead as possible.
Changes in Molecular Structure
One of the main practical questions is what can be done to relieve the stresses before machining? Advances in cryogenics have revealed that when parts are treated to temperatures of around -300 F, at a controlled time / temperature cycle, all internal stresses are revealed. This is because of the alignment of the molecular structure that was distorted during the process. When parts that have been through cryogenic stress relief are machined, there will be no distortion on the machined surface. If there is any distortion, it will be due to improper machining, or dull tools.
Cryogenics is still a relatively new science, and it is one that has a bright and promising future.
Darlyn Burkle writes about various kinds of stress and stress related issues. Avoid stress related illnesses in your family by finding out how stress management helps illness Sign up for our FREE newsletter and make stress and health management a priority in your family.