To All:
Here's an informative metalworking site (Shopswarf), I ran across while searching for something else. I've listed the address and Index below.
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To All:
Here's an informative metalworking site (Shopswarf), I ran across while searching for something else. I've listed the address and Index below.
=======================================================
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Good stuff, thx BB Fer grins I looked at Titanium milling -------------- blank.......hehehe. guess your not suppose to? Better tell my boss.
Gil:
I think the two following lines after the blank one relate to machining titanium. One says "Under Rc 30" and the other says "Rc
30-40". BUT, the data seems old since they mention using HSS and Cobalt as the end mill cutting tool materials for all their data. So I don't know how useful that particular chart would be now-a-days with the widespread use of solid and inserted carbide end mills as well as PVD diamond and some ceramic inserts.
Gil:
Ya know, I've done some Ti over the years. In fact I remember posting an article about it. The title was something like "Take a bite out of titanium". Let me see if I can find it.....
Here it is. It was a post from 2006. I'm surprised I got the title even close since I can barely remember what I had for breakfast yesterday.
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As a result of the normal cutting process, titanium alloys tend to workharden. This is especially true when an inappropriate tool is applied. Instead of cutting the part, the wrong tool "pushes" it, straining the alloy. As the material moves away from the cutting edge it deforms plastically rather than elastically. Plastic deformation increases the material's strength - and, unfortunately, its hardness - at the point of cut. As the alloy reaches a higher level of hardness and strength, cutting speeds that were appropriate at the start of the cut become excessive, and the tool wears dramatically.
Milling titanium alloys requires high chip loads, resulting in high torque being generated. That makes it essential to break chips into smaller pieces, especially when making heavy roughing cuts. Using roughing end mills and various types of chipbreakers considerably reduces cutting-edge pressure.
The "phobia" about using titanium nitride(TiN)-coated tools to cut titanium alloys seems unfounded. There is a fear that chemical reactions eventually will occur between the titanium elements. Experience doesn't bear this out. In fact, TiN coatings have provided some small improvements in certain applications. But in most cases, TiN-coated HSS tools don't perform any better than uncoated ones when machining titanium.
Titanium alloys respond best to heavy cuts generating thick, well-defined chips. There are limits, though, because of the high torque generated. As a general rule, width of cut should be no more than 30 percent of tool diameter.
Cut titanium alloys at continuous feed rates. Never allow the tool to "dwell" in the workpiece. =====================================================================
nd Cobalt as the
emember posting
I got the title
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So, does that mean that if I use a dull tool for the final finish pass, at a very small DOC it will give me a "Forged" part?
Obligatory (grin)
HN:
Weeeell, you know it might not end up being officially "forged" but the surface hardness would probably go up. I wonder if any experiments have been done with this. Perhaps something like roller burnishing on side walls, or the like.
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