Gear cutting – milling – or planing – Milling – Process
Patent
1996-12-09
1999-03-02
Pitts, A. L.
Gear cutting, milling, or planing
Milling
Process
408110, 408236, 409178, 409179, 409199, 409201, B23C 900
Patent
active
058761616
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for making an elongated hole in a pipe by means of a rotating conical tool. One implementation of the method is commenced such that, in a first sequence, a conical tool is used for drilling through the wall of a pipe by pushing the conical tool in the direction of its rotating axis to a desired depth, which determines the width of a finished hole.
When a pipe is provided with a hole in view of pulling up the hole edges as a collar, the edges of said collar can be brought closer to level if the hole is made elongated in the longitudinal direction of the pipe. It is prior known to operate a conical tool such that the hole edges are defined according to an intersecting line between the conical surface and the cylindrical surface, the hole having a degree of ellipticity which depends on the ratio between the diameter of the pipe and the minor diameter of the hole.
An object of the invention is to provide an improved method and apparatus which enable the selection of a ratio between the length and width of a hole more freely than before by means of a simple mechanism. A further benefit offered by the method is the adaptability to various wall thicknesses and pipe materials.
The characterizing features of the method are set forth in the annexed claim 1. The characterizing features of the apparatus are disclosed in claim 6. The non-independent claims disclose characterizing features for preferred embodiments of the invention.
A method and apparatus of the invention will now be described in more detail with reference made to the accompanying drawings, in which
FIGS. 1A, B and C depict the implementation of a first sequence of the method from various aspects;
FIGS. 2A and B depict the implementation of a second sequence of the method;
FIGS. 3A and B depict the implementation of a third sequence of the method:
FIGS. 4A and B show an apparatus according to a first embodiment of the invention for controlling the actions of a conical drill;
FIGS. 5A and B show an apparatus according to a second embodiment of the invention for controlling the actions of a conical drill and
FIG. 6 illustrates the actions of a conical drill in an alternative method of the invention.
First, a method according to the first embodiment of the invention will be described with reference to FIGS. 1-3.
The method is carried out with a conically shaped tool 1, having a conical surface which is provided with bits 1a on diametrally opposite sides thereof. The conical drill 1 is rotated around a centre axis 2. The rotating axis 2 extends through a pipe centre axis 6.
In the first sequence of the method, the conical drill 1 is used to drill through the wall of a pipe P to a desired depth. This results in a hole 3, having a width which corresponds to that of a finished hole. Thus, the drilling depth determines the width of a hole. In this drilling sequence, the conical bit 1 is pushed in the direction of the rotating axis 2.
In the second sequence, the conical bit 1 is tilted relative to a pivot point 5a located above the top pipe surface. The pivot point 5a is offset from a mid-line 4 in the direction of tilting. Upon tilting, the conical drill 1 rises upward and moves forward in the longitudinal direction of a pipe. Thus, the rotating conical drill 1 mills one end 3.1 of an elliptical hole into the shape shown in FIG. 2. The adjustment of an angle of inclination .alpha. of the drill 1 can be used for determining the length of a finished hole in relation to the width thereof.
For the third sequence of the method, the conical drill 1 is first returned to an initial position corresponding to FIG. 1, wherein the axis 2 coincides with the mid-line 4. This is followed by effecting a corresponding lift and concurrent tilting about a pivot point 5b in the opposite direction, the conical drill 1 milling the other end 3.2 of the elliptical hole.
The same tool can be used for making holes of varying sizes and degrees of ellipticity since the first-sequence drilling depth and the second- and third-sequence angle of incli
REFERENCES:
patent: 1886082 (1932-11-01), Chapman
patent: 2499842 (1950-03-01), Armitage
patent: 2823591 (1958-02-01), Craddock et al.
patent: 2969000 (1961-01-01), Grobecker
patent: 3241405 (1966-03-01), Davis
patent: 3596558 (1971-08-01), Rydell
patent: 3699828 (1972-10-01), Piatek et al.
patent: 4425059 (1984-01-01), Colas et al.
patent: 4729698 (1988-03-01), Haddon
patent: 4743149 (1988-05-01), Geise
patent: 5046903 (1991-09-01), Nagayoshi et al.
patent: 5201618 (1993-04-01), Malarz et al.
patent: 5238340 (1993-08-01), Ochiai et al.
patent: 5312211 (1994-05-01), Rodriguez
patent: 5368423 (1994-11-01), Hanna
Ikola Juha
Saari Timo
Kirkman Christopher
Pitts A. L.
T-Drill Oy
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