Guest pvtkary Posted September 6, 2002 Share Posted September 6, 2002 Ok guys, I need some more help. When prepaining to build a motor some prudent steps are to polish, and radius the components to reduce stress risers. shot peening compacts the outer layer of the metal to produce a compressive stress gradient. criogenic freezing sets the molucles into an ordered cristaline lattice instead of a polycrystiline lattice. My question is freezing before shot peening or after? I think that the two methods may not compliment each other. It would be cool if they do. Quote Link to comment Share on other sites More sharing options...
Phantom Posted September 6, 2002 Share Posted September 6, 2002 What are you trying to do - and why? Both processes have specific applications for specific shapes. The cryogenic process is an excellent process for eliminating deep stresses in a large shape - like your engine block. It will keep it from changing shape as it heats up. Shot peening would be more useful for like connecting rods - non "bearing" surfaces. You would not use them together but separately for different applications. Quote Link to comment Share on other sites More sharing options...
Guest pvtkary Posted September 7, 2002 Share Posted September 7, 2002 phantom I think that I understand the science behind both processes. I dont have experience with mixing them. In my minds eye the cryo would help me to orginaze the molecular cristiline lattice of the metal. The shot peening is simlar to tempering glass. I was hoping that I could combine both processes to engine components to make them lighter, and stronger. The rub is that cryo people say that it should be the last step. I think that shot peening would screw up this crio effect on the surface of the metal. I also think that cryo would screw up the tempering effects of shot peening. I think It would be cool if I could exploit both. Thank you for the insight, and I would greatly appreaciate more. Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted September 8, 2002 Share Posted September 8, 2002 Don't forget Metalaxing which is a vibration based treatment. Quote Link to comment Share on other sites More sharing options...
Guest pvtkary Posted September 8, 2002 Share Posted September 8, 2002 metalaxing? sounds like muffler bearings to me. can you please describe the process. Quote Link to comment Share on other sites More sharing options...
Guest 1fastz Posted September 8, 2002 Share Posted September 8, 2002 metalaxing is the process of useing vibration to stress relieve materials. the parts are atached to a vibration device wich then vibrates the molecules in the material causieng them to shift and releave stresses and settle into a more oderly latice. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 8, 2002 Share Posted September 8, 2002 cryo should always be done last, as shot peening can effectively mess up the natural crystalline lattice by compressing it. cryo would restore this lattice in the shot-peened shape. cryo is always helpful, no matter what application it is used for. it may not help a whole lot all the time, but better safe than sorry. My sister has nylons that she had cryogenically frozen 3 years ago. THREE YEARS AGO. she still uses em. Quote Link to comment Share on other sites More sharing options...
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