The patent doesn't explicitly state what the process targets beyond 'quality', though it's reasonable to assume electrical performance is part of the equation because it's wire. Certainly it's not presented as a process patent to save cost or simplify manufacturing. What is your understanding of its value?
Sure it does.
It is generally known that if a metallic material is subjected to cold working, such as rolling or drawing, it hardens and is eventually likely to fracture or crack at a primary crystal grain boundary which is formed in the casting process. Therefore, it is highly desirable to use a metallic material having a structure free from any such grain boundary in order to make a wire, sheet or foil which is extremely small in diameter or thickness.
My understanding of its value is what they state is the value, as quoted above, i.e. a process by which cracking or fracturing when being worked is less likely than with other processes as it relates to producing very fine wires or thin foils.
se
RDF you have to say micro-crack, or something more scientific. I will try to find some acceptable terms.
Who cares?
🙂
A pretty good illustration how reliable audio memory is:
Audio illusion. [VIDEO]
(for comparing those burned in to non burned in)
🙂
A pretty good illustration how reliable audio memory is:
Audio illusion. [VIDEO]
(for comparing those burned in to non burned in)
That doesn't set limits on the patent approval process, and the preamble was pretty clear it addresses end-user needs. Is the intent to prevent fine-wire catastrophic mechanical failure in the field?
That's so cool I hate to point this out..... but in this case the ear is only deceived by the short time between plays. If doesn't work if you don't 'switch to the next play' immediately. After a bar or two the ear learns to hear it properly again.
I'll go cycling now. 😀
That's not really a revelation. I'll point out that what you've noticed reinforces the idea - time passes (relatively short amount of time though somewhat longer than a bar or two) and your audio memory is off track again.
Imagine the same problem in the visual realm - a sequence of numbers is displayed, 1 to 20 and the next time through they "appear" to be 21 to 40. And so on.
After a few minutes break you look again to "see" the sequence go from 2 to 21. That would qualify as unreliable.
I think that 'grain boundary defects' might be a pretty good general term for the micro-gaps in pure copper and virtually any other metal.
It's rather clear to me that it's to address concerns on the part of those producing the wire, not the end user. And more specifically, producing smaller wire than usual.
With its rapid growth, the electronic industry has incessantly been calling for still smaller and more precise machines and devices. They require metallic materials which are still smaller in thickness or diameter, and which are still better in quality. More specifically, they require thinner wires, sheets and foils formed from a material having a unidirectionally solidified structure, and which is free from any cavity or blowhole, and any grain boundary where impurities are likely to gather.
It is generally known that if a metallic material is subjected to cold working, such as rolling or drawing, it hardens and is eventually likely to fracture or crack at a primary crystal grain boundary which is formed in the casting process. Therefore, it is highly desirable to use a metallic material having a structure free from any such grain boundary in order to make a wire, sheet or foil which is extremely small in diameter or thickness.
se
It appears to be virtually impossible to make a defect free piece of copper, aluminum, or gold, from proven measurements that I have in textbooks, and no matter how carefully you handle it, problems still occur, caused by temperature differentials, sonic vibration, etc.
My partial apologies Andre, I found a paper that claimed the rods can be pulled as a single crystal at 50mm/min. I also found the same graphic on another cable makers site. The rods are only starting material for pulling wire which does make for some defects. I still can't find a wire manufacturer with single crystal wire.
BTW excess noise from a resistor made of the wires should be a measure of the effects of all this.
BTW excess noise from a resistor made of the wires should be a measure of the effects of all this.
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We experience it differently. After three or four repetitions I learned to hear it as 1, 2, 3....20, 21, 2, 3...... A clear (and illusory) downshift in pitch occurs after the repeat first bar. The illusion is an artifact of fast switching ABX-style. Wait three or four seconds between repeats and adjust your expectations to anticipate a slightly higher pitched first bar and the illusion evaporates. At least for me.
Thanks se, it's an intellectual exercise without relevance to the electronic industry call in the first line of your quote, that has no relevance to mechanical integrity or electrical properties of the wire. Tough sell for poor Ohno.
Great. Now show that it's of any consequence other than a simple increase in the wire's resistance and that this resistance isn't completely swamped by the wire's thermal resistance.
se
Which is?
Well they claim conductivity has been increased by between 2 and 10%.
If there were any significant fractures or cracks, maybe, but anyone who has just a minimum of experience shaping metals, will know that in particular a material like copper, can almost be "raped", and still have the same properties afterwards.
If any of the "crack & fracture" theory would hold true, what do you think would happen in a larger scale?
Let's take an example:
A 15 x 50mm copper bar is bent 90 degrees. Do the math, and you'll see that this is way beyond drawing wire.
Such bars are bent like that, on regular basis, and used to conduct kA. If they would be damaged by being shaped, you could count on that the error would not pass unheard 😀
Magura 🙂
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