Skärhastighet
Skärhastighet är hastigheten eller periferihastigheten på det skärande verktyget vid skärande bearbetning. Skärhastigheten mäts i meter per minut (m/min).
Formeln
Formeln för skärhastigheten lyder: π ∙ d ∙ v och gäller för alla material.
- π ≈ 3,14
- d = ämnets diameter i meter om det gäller svarvning. Vid fräsning är det diametern på verktyget.
- v = spindelvarv per minut
Exempel: Du skall svarva en detalj som är 75 mm i diameter = 0,075 meter
- Spindelvarvet = 100 varv per minut
- 3,14 ∙ 0,075 ∙ 100 = 23,55 meter/minut.
Notera att skärdjupet aldrig har med skärhastigheten att göra.
Källor
- Formel från http://hem.passagen.se/kjellihbg, hämtad 061023
Media som används på denna webbplats
Speeds and feeds 0001.png
Författare/Upphovsman: Three-quarter-ten, Licens: CC BY-SA 3.0
A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. The angular velocity of the workpiece (rev/min) is called the "spindle speed" (light blue) by machinists. Its tangential linear equivalent at the tool-cutter interface (m/min or sfm) is called the "cutting speed", "surface speed", or simply the "speed" (dark blue) by machinists. The "feeds" may be for the X-axis (purple) or the Z-axis (pink) (typically mm/rev or inch/rev for lathe work; sometimes measured as mm/min or inch/min). Notice that as the tool plunges closer to the workpiece's center, the same spindle speed will yield a decreasing surface (cutting) speed (because each rev represents a smaller circumferential distance, but takes the same amount of time). Most CNC lathes have CSS to counteract that natural decrease, which speeds up the spindle as the tool plunges in.
Författare/Upphovsman: Three-quarter-ten, Licens: CC BY-SA 3.0
A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. The angular velocity of the workpiece (rev/min) is called the "spindle speed" (light blue) by machinists. Its tangential linear equivalent at the tool-cutter interface (m/min or sfm) is called the "cutting speed", "surface speed", or simply the "speed" (dark blue) by machinists. The "feeds" may be for the X-axis (purple) or the Z-axis (pink) (typically mm/rev or inch/rev for lathe work; sometimes measured as mm/min or inch/min). Notice that as the tool plunges closer to the workpiece's center, the same spindle speed will yield a decreasing surface (cutting) speed (because each rev represents a smaller circumferential distance, but takes the same amount of time). Most CNC lathes have CSS to counteract that natural decrease, which speeds up the spindle as the tool plunges in.
StimUmfangsfraesen2B.png
Författare/Upphovsman:
Milling cutter paused after taking a cut. Arrows show the vectors of various velocities collectively known as speeds and feeds. Circular arrow represents angular velocity of the spindle in rev/min, called the "spindle speed" by machinists. The tangential arrow represents the tangential linear velocity (m/min or sfm) at the outer diameter of the cutter, called the "cutting speed", "surface speed", or simply the "speed" by machinists. The arrow colinear with the slot that has been milled represents the linear velocity at which the cutter is advanced laterally (usually mm/min or inch/min for milling; may also be measured as mm/rev or inch/rev). This velocity is called the "feed" by machinists.
Författare/Upphovsman:
- StimUmfangsfraesen2.jpg: User:ZM2010-LWL-BBW-Soest
- derivative work: — ¾-10
Milling cutter paused after taking a cut. Arrows show the vectors of various velocities collectively known as speeds and feeds. Circular arrow represents angular velocity of the spindle in rev/min, called the "spindle speed" by machinists. The tangential arrow represents the tangential linear velocity (m/min or sfm) at the outer diameter of the cutter, called the "cutting speed", "surface speed", or simply the "speed" by machinists. The arrow colinear with the slot that has been milled represents the linear velocity at which the cutter is advanced laterally (usually mm/min or inch/min for milling; may also be measured as mm/rev or inch/rev). This velocity is called the "feed" by machinists.