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PLSHY
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Yes, four-stage stretch forming, and I also tinned it
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Microtek
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And some trumpet shaped cones as well I see. How big are they?
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PLSHY
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11cm diameter
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Microtek
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I can see why you need such large amounts of HE then. I think you should go for plasticized PETN rather than the ETN/PETN melt we are discussing in
the other thread.
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PLSHY
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Electroformed medicine cover, but it produced spiral patterns! Very strange! Can someone tell me how this spiral pattern is produced? Is it caused
by the mold rotating too fast? My mold speed is 120 rpm
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Tsjerk
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Do you have a link to the process you used?
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PLSHY
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My process is as follows:
Electrolyte: {150 g copper sulfate (anhydrous), 50 g sulfuric acid, 20 mg thiourea}/per liter.
Current density 3A/square decimeter.
The cathode rotation speed is 120 rpm.
The area of the anode is twice that of the cathode.
The distance between anode and cathode is 6cm.
Temperature constant 30 degrees
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PLSHY
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Found the reason! The current density is too high! After electroforming for 24 hours at a current density of 3A, it was removed and the effect was
very poor
[Edited on 18-10-2023 by PLSHY]
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PLSHY
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Then I lowered the current density and re-electroformed it using a current of 1.5A. This time the effect was much better. You can see the surface and
even reached a partially reflective level without polishing. This means that the grains are very So thin!（photo）
Finally, it can be found that there are still some imperfect structures on his surface, so I decided to repeat the electroforming again using a
current density of 1A. (In the photo, the medicine-shaped mask has undergone stress relief treatment at 200 degrees Celsius for one hour, so there is
some discoloration)
 
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PLSHY
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1A
  
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PLSHY
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I tried modern electroforming additives again, and the effect was very powerful! It can be completely reflective as soon as it is electroformed!
 
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Microtek
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I think the spiraling striations look as if they might reduce performance of the charge. Similar to the known fact that spinning conical liners on a
lathe introduces spin to the jet when the charge is fired. This defocuses the jet, and reduces performance.
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PLSHY
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Quote: Originally posted by Microtek  | | I think the spiraling striations look as if they might reduce performance of the charge. Similar to the known fact that spinning conical liners on a
lathe introduces spin to the jet when the charge is fired. This defocuses the jet, and reduces performance. |
It's true that surface swirl patterns can have undesirable consequences, but the spiral arrangement of the internal crystal
structure is beneficial. Just like the Spin processing cover is similar to stamping in the static armor breaking state, but it is much higher than
stamping in the rotating state. However, considering that I mostly conduct static armor-breaking experiments, I thought about reducing the spiral
patterns on the surface as much as possible, or eliminating the spiral patterns through polishing.
[Edited on 2-11-2023 by PLSHY]
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Microtek
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I don't understand what you are trying to say here. What cover are you talking about? What do you mean by "stamping". What do you mean by "static
armor breaking state"? Your non-standard terminology is really throwing me off.
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PLSHY
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| Quote: Originally posted by Microtek | | I don't understand what you are trying to say here. What cover are you talking about? What do you mean by "stamping". What do you mean by "static
armor breaking state"? Your non-standard terminology is really throwing me off. |
"Stamping" means the same as
"deep drawing" you mentioned before, and they both belong to the same processing method. Static armor piercing is to test the warhead without
rotation or initial speed. I'm sorry for my bad English. I'm working hard to learn English
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