Multidiameter cutting tool having balanced minimum quantity lubrication flow and method of manufacturing a multidiameter cutting tool
AssigneeFord Motor Company
InventorsEthan Hughey, David Stephenson
Life of this patent
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Abstract
A cutting tool and method of manufacturing a tool including determining desired flowrates to cutting edges. The method includes calculating pressure drop and passage dimensions for each of an nth-number of passages to the cutting edges based on In=(Pn*Ann)/(ρn*Ln), wherein In is nth-passage flow rate, Pn is nth-passage pressure drop, Ann is nth-passage cross-sectional area raised to a power n, the power n being equal to 1 or 0.5, ρn is nth-passage resistivity, and Ln is nth-passage length. The method includes forming the nth-passages in the tool open to each cutting edge based on the nth-passage dimensions.
Claims10
A method of manufacturing a tool disposed about an axis and having a plurality of cutting edges at a plurality of diameters, the method comprising:
- determining a desired flowrate to a corresponding one of the plurality of cutting edges at the plurality of diameters for each nth-passage of nth-passages, the nth-passages extending from a central bore to the cutting edges;
- calculating a pressure drop, a cross-sectional area, and a length for each of the nth-passages based on In=(Pn*Ann)/(ρn*Ln), wherein In is the flowrate of the nth-passage, Pn is the pressure drop of the nth-passage, Ann is the cross-sectional area of the nth-passage raised to a power n, the power n being equal to 0.5, ρn is an nth-passage resistivity, and Ln is the length of the nth-passage, wherein one of the nth-passages has one end open to the central bore and an opposite end open through a terminal end-most surface of the tool;
- and
- forming the nth-passages and the central bore in the tool such that each of the nth-passages is open to the central bore and open to the corresponding one of the cutting edges, wherein each of the nth-passages is formed edge based on the calculated Ann and Ln for the nth-passage.
A method of manufacturing a cutting tool disposed about an axis, the cutting tool configured to have a first cutting face at a first diameter and a second cutting face at a second diameter, the method comprising:
- determining a desired flowrate of lubricant to the first cutting face and a desired flowrate of lubricant to the second cutting face;
- forming a main bore in the cutting tool, the main bore being disposed about the axis and configured to receive input lubricant;
- forming a first passage in the cutting tool, the first passage having a first end and a second end, the first end of the first passage being in fluid communication with the main bore, the second end of the first passage being configured to provide lubricant to the first cutting face, a cross-sectional area of the first passage and a length of the first passage being calculated according to:
- A1n/L1=I1*ρ1/P1, wherein Aan is the cross-sectional area of the first passage raised to a power n, the power n being equal to 0.5, L1 is the length of the first passage, Ii1 is the desired flowrate of lubricant to the first cutting face, p1 is a resistivity of the first passage, and Pi is a pressure of lubricant at the first end of the first passage;
- forming a second passage in the cutting tool, the second passage having a first end and a second end, the first end of the second passage being in fluid communication with the main bore, the second end of the second passage being configured to provide lubricant to the second cutting face, a cross-sectional area of the second passage and a length of the second passage being calculated according to:
- A2n/L2=I2*ρ2/P2, wherein A2n is the cross-sectional area of the second passage raised to the power n, L2 is the length of the second passage, 12 is the desired flowrate to the second cutting face, ρ2 is a resistivity of the second passage, and P2 is a pressure of lubricant at the first end of the second passage;
- and
- forming a distal passage in the cutting tool, the distal passage having a first end open to and configured to receive lubricant from the main bore and a second end open through a terminal end-most surface of the too.
Dependencies are inferred from the claim text.