Drilling tool for machine tools and method for the production thereof
AssigneeKomet Group GmbH
InventorsHendrik Nitzsche, Gerhard Stolz, Hans Haidinger, Benno Spors
Life of this patent
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Abstract
The invention relates to a drilling tool for machine tools. The drilling tool comprises a drill body, a cutting head arranged on the front face of said drill body and a shaft arranged at the end thereof, wherein the drill body has two chip flutes, which are delimited at their flanks by ribs and a first chip flute of which is spirally curved. A special feature of the invention is that a second chip flute is not spiraled or is spirally curved with a pitch differing from the first chip flute, preferably running in the same direction of rotation.
Claims29
1-33. (canceled)
A method for producing drilling tools, comprising a drill body (14) having an end cutting head (16) and an end shank (12), in which
- a base material body is turned by machining to a drilling body contour forming a rotationally symmetrical first blank (38),
- at least two chip flutes (24, 26) are milled into a cylindrical section of the blank (38),
- wherein a first of the chip flutes (26) is first of all milled into the blank (38) in the form of a non-helical groove,
- and the blank which has been prefabricated in this way is heated to a predetermined temperature at clamping-in points (42, 44), which are arranged at an axial distance from one another, in a zone which is located between the clamping-in points, and has a coaxial torsional moment applied to it at the clamping-in points (42, 44) and in the process is plastically twisted in helical shape through a predetermined angle,
- characterized in that a second chip flute (24) in the form of a helical groove is milled into the prefabricated blank such that a rib (28, 36) remains between each of the chip flutes (24, 26), the profile of which ribs (28, 36) has a variable width along the drill body (14).
A method for producing drilling tools, comprising a drill body (14) having an end cutting head (16) and an end shank (12), in which
- a base material body is turned by machining to a drilling body contour forming a rotationally symmetrical first blank (38),
- at least two chip flutes (24, 26) are milled into a cylindrical section of the blank (38),
- wherein a first of the chip flutes is milled into the blank at first in the form of a non-helical straight longitudinal groove,
- and the blank which has been prefabricated in this way is heated to a predetermined temperature at clamping-in points (42, 44), which are arranged at an axial distance from one another, in a zone which is located between the clamping-in points, and has a coaxial torsional moment applied to it at the clamping-in points (42, 44) and in the process is plastically twisted in helical shape through a predetermined angle,
- characterized in that the blank is first of all provided with a first straight longitudinal groove (24), is then heated and is initially twisted through a first rotation angle, in that a second groove (26) is then milled into the initially twisted blank, and in that the blank is then twisted through a second rotation angle, in the heated state.
A method for producing drilling tools, comprising a drill body (14) having an end cutting head (16) and an end shank (12), in which
- a base material body is turned by machining to a drilling body contour forming a rotationally symmetrical first blank (38),
- at least two chip flutes (24, 26) are milled into a cylindrical section of the blank (38), wherein one of the chip flutes (24) is milled into the blank in the form of a straight or helical groove,
- and the blank which has been prefabricated in this way is heated to a predetermined temperature at clamping-in points (42, 44), which are arranged at an axial distance from one another, in a zone which is located between the clamping-in points, and has a coaxial torsional moment applied to it at the clamping-in points (42, 44) and in the process is plastically twisted in helical shape through a predetermined angle,
- characterized in that the second chip flute (26) is milled in helically with a pitch which is not the same as the pitch of the first chip flute (24), before the blank is twisted to a helical shape.
A method for producing a drilling tool, comprising a drill body (14) having an end cutting head (16) and an end shank (12), in which
- a base material body is turned by machining to a drilling body contour forming a rotationally symmetrical blank (38),
- two deep-hole bores (32′, 34′) are incorporated in the first blank, are arranged at a distance from one another and extend from points which are arranged eccentrically with respect to a center axis on the end face of the cutting-head-end blank end, in the direction of its shank (12),
- the second blank which has been prefabricated in this manner is heated to a predetermined temperature at clamping-in points (42, 44), which are arranged at an axial distance from one another, in a zone which is located between them, and is twisted plastically in a helical shape through a predetermined angle,
- characterized in that on of the deep-hole bores (32′) runs obliquely with respect to the other deep-hole bore (34′) and with respect to the central axis of the first blank, and in that two chip flutes (24, 26) are milled straight and/or in a helical shape in the twisted third blank such that the coolant channels (32, 34) which are formed during twisting run within ribs (28, 30) which remain between adjacent flanks of the chip flutes (24, 26).
A drilling tool for machine tools having a drill body (14), a cutting head (16) which is arranged thereon at the end, and a shank (12) which is arranged thereon at the end, wherein the drill body (14) has two chip flutes (24, 26), which are bounded on their flanks by ribs (28, 30), of which a first chip flute (28) is curved in a helical shape, and a second chip flute (30) is not helical or is curved in a helical shape with a pitch which differs from that of the first chip flute (28), and preferably runs in the same rotation direction, wherein a first coolant channel (34) is provided in a rib (28) of the drill body (14), extends from the shank end to the cutting-head end of the drill body (14), and has an outlet opening at the cutting-head end,
- characterized in that a further coolant channel (32) is formed in a further rib (30) and extends from the shank end to the cutting-head end of the drill body (14), wherein the coolant channels (32, 34) which are arranged in the various ribs (28, 30) have a differently helical profile.
Dependencies are inferred from the claim text.