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.
Claims19
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 desired flowrates to cutting edges;
- 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;
- and
- forming the nth-passages in the tool open to each cutting edge based on the nth-passage dimensions.
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;
- and
- 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 A1n is the cross-sectional area of the first passage raised to a power n, the power n being 1 or 0.5, L1 is the length of the first passage, I1 is the desired flowrate of lubricant to the first cutting face, ρ1 is a resistivity of the first passage, and P1 is a pressure of the 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, I2 is the desired flowrate to the second cutting face, ρ2 is a resistivity of the second passage, and P2 is a pressure of the lubricant at the first end of the second passage.
A cutting tool comprising:
- a tool head disposed about an axis, the tool head defining:
- a main bore disposed about the axis and open at a proximal end of the tool head, the proximal end being configured to receive a lubricant into the main bore;
- a first passage in fluid communication with the main bore and open to an exterior of the tool head at a first location that is a first radial distance from the axis, wherein a length of the first passage is related to a cross-sectional area of the first passage according to:
- A1n/L1=I1*ρ1/P1, wherein A1n is the cross-sectional area of the first passage raised to a power n, the power n being equal to 1 or 0.5, L1 is the length of the first passage, I1 is a flowrate of the lubricant from the first passage, ρ1 is a resistivity of the first passage, and P1 is a pressure of the lubricant at an end of the first passage proximate to the main bore;
- and
- a second passage in fluid communication with the main bore and open to an exterior of the tool head at a second location that is a second radial distance from the axis, the second radial distance being greater than the first radial distance, wherein a length of the second passage is related to a cross-sectional area of the second passage according to:
- A2n/L2=I2*ρ2/P2, wherein A2 is the cross-sectional area of the second passage raised to the power n, L2 is the length of the second passage, I2 is a flowrate of the lubricant from the second passage, ρ2 is a resistivity of the second passage, and P2 is a pressure of the lubricant at an end of the second passage proximate to the main bore;
- a first cutting edge fixedly coupled to the tool head at the first location;
- and
- a second cutting edge fixedly coupled to the tool head at the second location.
Dependencies are inferred from the claim text.