carbide micro fracturing is a bitch...so is titanium (inconel isn't too fabulous either). The ONLY cool thing I like is the magnesium-esque fire/burning properties
@@jasonaldenhaley1 I've never set any on fire -- even grinding it a little. A machinist friend said someone at his shop set one on fire with a milling machine and it was just impossible to put out. Burned up a lot of expensive equipment before it burnt itself out. I do know that grinding in on a regular home shop type grinding wheel produces the longest and brightest white sparks I've ever seen.
@@luke_skywanker7643 I'd purposely take a super light cut for that 'S.O.S.' pad chip ball and then she'd light up SUN-BRIGHT and no, not puttin that out. I couldn't imagine surviving a plane crash just to...omg, don't even wanna think of that stuff burning a person!!! Million degree burns right there... hopefully get out AS SOON AS POSSIBLE!!
@@jasonaldenhaley1 True. Magnesium and aluminum are pretty bright and hot when they catch fire -- but nothing like titanium. Titanium is also supposed to be "water reactive" when it gets to about 1,300f. It breaks down the water, absorbing the oxygen and releasing the hydrogen, causing an explosion.
we wont ever know.. All cos they wouldnt use lubre they kept wearing the cutting inserts and replacing them eventually going bankrupt.. there not cheap to replace those inserts
I can’t believe that such a large milling machine like that doesn’t have a coolant system to keep the cutting inserts from getting very hot and apparently wearing out in short time period!
@@lukewarmwater6412 i think these actually aren't very expensive the guy who runs the Chanel mentioned somewhere that they are like 1.5€ a piece. But yeah coolant would help massively here. But i think it's just the age of this mashine.
Yes they will ignite. Not to mention, you really should t intermittently dowse inserts with coolant. They will thermal crack. Just throwing it out there. I’ve cut tons and tons of ti in all grades. Best way to cut is with steady coolant or cutting oil.
The grinding dust is what you really have to be careful of. I worked for a company that centerless ground titanium rods and once the guy operating it started it before flooding it with coolant and youd swear it was gunpowder igniting. Not easy to extinguish either
Exactly my thought... Also, it would prevent the risk of those red-hot chips catching fire - extinguishing which is next to impossible AFAIK. And then the intermittent cooling of hot carbide tips - wouldn't they crack from it?
@@kingofl337 Work hardening is triggered by deformation, not by heat. Cooling could perhaps make a small difference by prolonging tool life, since dull cutting edges tend to smear more, but that's only a guess on my part.
@@oliviercoen446 There are basically 3 different mechanisms by which metals and alloys accommodate deformation. Dislocations, twinning or phase transformation. Which one applies is determined by chemical composition. Ductile metals and alloys deform through formation of dislocations. Think of those as atom stacking faults which can move around. A high local deformation increases the dislocation density to a point where the stacking faults get in the way of each other. If dislocations have a harder time moving around, the metal cannot allow the deformation as easily. The strength increases because of plastic deformation.
Manually pouring coolant on the tool head will wear the inserts out. Either steady cool or not but intermittent cooling by manually pour coolant on a extremely hot cutting tool is not good I’d assume right??
Alot of US companies have privacy rules about it. At least my company does. We are not allowed to even have our cell phones on the shop floor let alone try to take a picture or video.
The thermal shock introduced by coolant to such a meaty interrupted cut would likely kill the inserts quicker. Coolant in a turning op, like you say, may have some benefit since it's uninterrupted.
I have to imagine this was the guy's first day on the job. I've never seen a machinist watch his drill head turn orange from heat and either not turn it off or realize he'd forgot the coolant
Nah he knows what he’s doing. Not to be rude but it just shows how much you know by calling it a “drill head” lol. It’s a given that on the raw rough surface of forged titanium, especially such a massive piece, inserts are going to be wore out so once that happens it doesn’t matter if he goes a bit longer and gets them more dull because they are already finished. Plus they are a disposable and replaceable part of the tool. Also the tool itself isn’t getting red hot, that’s the chips. If you want to see another crazy example of this look up ceramic endmill cutting nickel based allow like inconnel 625 or something
The old masters told me that titanium is best cooled with plain water. They say that coolant for some reason contributes to the rapid wear of the tool and high heating, and with water it is cut much better.
SomeSay: Waterbased coolants are what your “old masters” meant. You add 50:50 coolant concentrate to water, but need to filter and clean the sump or it sticks up quickly.
Probably a silly question as I am not a machinist but why do you not use coolant for cutting this titanium... I would love have thought a mist coolant spray would be better than a drink bottle of coolant
@@diegoceballos6871 lol stop acting like you have a clue. There are several ways to cool/lube that depend on the application and design parameters. Go make a rake.
Thermally induced micro-fractures.. the heat from the contact during the cut and the subsequent and immediate cooling of the carbide insert cause fracturing of said insert and then the insert almost explodes.. it's better to keep the heat in the chip that is being removed.. that being said, there is a balance between tool life and material removal when it comes to profit margins.. machining is a fickle business.. not easy to make money without the proper tools and knowledge.
All the negative comments , he blasted that Titanium without damage ! Job shops that deal with super alloys don’t worry about insert cost they spend the money for development!
The temperature is the enemy number 1 of the cutting tools. If that milling has a constant fluid of cooling on the cutting tool they last the entire process and more.
I am often confused as to why fluids are not used in the cutting process so often. Cutting fluid as a coolant actually improves the cutting speeds as well as tool life.
@@thomasstuart6861 No, not necessarily... in Turning and Holemaking coolant is essential for the tool-life. But when milling structural and tool steel it is often counterproductive. Modern coatings on carbide tools need the heat to work; thermal shock is cracking the coating when milling with coolant; the stick-slip-effect is important when milling with negative tools and/or large overhangs. Mostly tools die and wear of poor chip evacuation when machining without coolant. An airblast nozzle will work wonders. When it comes to HRSA or martensitic/stainless steels you will need coolant because of the bad thermal conductivity and stickyness of those workpiece materials. Certain modern and expensive coatings with smoothening surface treatments however can work on those workpiece materials without coolant.
@@thomasstuart6861 idk about that handbook. Is it that special american book? Heard lot of good things about it. I am trained as an optimizer for machining. I do read a lot of articles und publications but since im from Germany mostly in german. That is why my english is not exactly good. 🙈
@@timhoppmann3938 The Machinery handbook has been the definitive authority of engineering, manufacturing and machine technology for a hundred years of more but my copies are old. As an optimizer I would expect you could write a book on speeds/feeds and tooling. I have always been impressed with the new machinery techniques that from my perspective seem almost magical. However, I have recently watched a test on the use of an assortment of cutting fluids and poor quality drills. The results were astounding and not intuitive at all. I have always been disappointed by the failure rates in drill and tapping 4-40 threads and the type of cutting fluids make so much of a difference it is more of an occult science than logic.
To all the coolant junkies is said: This is a open machine. No housing. Flood cooling impossible. Cooling means the operator is standing in the coolant rain. It`s my job, I know what I`m talking about.
If a mirror finish is needed, you can remove 7 of the 8 tips and run the millhead with one tip only. Slow down the feed rate and speed up the spindle rotation, cutting depth 0,05 - 0,1 mm only.
0.05 cut depth with an insert that probably has a bigger radius then 0.1 is not going to give a good finish at all. I havent looked at the inserts in the finishing tool, but the first inserts had a huge radius on them. Those want a big chip or they wil not work wel.
The thumbnail made me think this was a rolling machine that rolled a big thick piece for a tank or something. Like half a bus in size. Then noticed the sides are cut. So then thought it was a solid chunk. LIKE WHAT WAS THAT GONNA BE USED FOR. Then watched the video :)
No coolant will create alpha case and the material will be brittle with alot of micro cracks. It will reduce the performance of the metal and it´s fatigue properties.
@@jackmclane1826 That's just the oxide "crust" on the outside of the part. Watch some videos of the forging process, you'll see this crust being formed and crushed in the high heat process.
Processed later down, we have bigger pieces than that at my work. We forge it down to 172mm. After that it will be used fore diffrent things, like pipes fore nuclear powerplants.
Pretty much guaranteed the end isn't perpendicular to the axis, but that doesnt matter. The forging is pretty uneven. You can see flat spots, dents, and cracks in the surface that all need to be milled away. The end he just cut just has to be close enough, then the rest of the part will be milled true to the end.
If you run the feed the other direction and use coolant continuously you'll not be seeing them little red fingers of death or chips on them when the come out.
This is the worst approach to do this...how many inserts you go through? Taking 10mm depth of cut isn't going to dull the inserts like that cause of the surface scale, that's more from no proper coolant delivery and running back over chips.