Gear cutting – milling – or planing – Milling – Including means to infeed rotary cutter toward work
Patent
1994-10-12
1996-06-11
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
Including means to infeed rotary cutter toward work
82164, 409199, 409219, B23C 308
Patent
active
055250173
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a work support device of a camshaft miller used for mill-machining a camshaft of an internal combustion engine.
TECHNICAL BACKGROUND
A conventional camshaft miller of this kind is provided with a work support device for supporting an intermediate portion of a work (camshaft) to be machined having both ends clamped for enabling the mill-machining with high accuracy.
The conventional work support device of the character described above includes, as shown in FIG. 1 and FIG. 2 being a sectional view taken along the line II--II in FIG. 1, respectively two supporting portions d for supporting, from a lower side thereof and a direction reverse to a milling direction, a plurality of journal portions c being at intermediate portions of a work b which is clamped at its both ends by chucks a, thereby preventing the work b from being deformed and vibrated by the milling reaction force during the milling operation.
The conventional camshaft support device of the above kind is disposed to be movable along an axial direction of the work b rested on a bed, not shown, to adjust an axial height (which means a distance from the supporting surface of the supporting portion d to the center of the work b, and the adjustment thereof is performed by changing the height of the supporting portion) in conformity with a diameter, of a portion having a smaller error within tolerance, of the journal portion c. For this reason, in a case where the work b on a side of the journal portion having a larger error within the tolerance of the journal portion c is clamped between the chucks a and a, certain supporting portions d, for example, those on both end sides, lift upward the work b, and accordingly, the work b is deformed as shown in FIG. 1 and a gap e is formed as shown in FIG. 2 between the journal portion c and the supporting surface of the supporting portion d at the central portion of the camshaft. As a result, there causes a case where the work b is not supported at the central portion of the camshaft, resulting in generation of vibration and noises during the machining and hence degrading the machining accuracy, thus being inconvenient.
Therefore, an object of the present invention is to provide a work support device of a camshaft miller capable of supporting a work without being effected by a difference in an error within tolerance of a diameter of a journal portion of a camshaft and hence being capable of preventing vibrations and noises from being generated during a machining operation to thereby prevent the lowering of the machining accuracy.
DISCLOSURE OF THE INVENTION
In order to achieve the above and other objects, according to a first structure of the present invention, there is provided a work support device of a camshaft miller in which a plurality of journal portions of a work to be machined are supported by a plurality of supporting portions from a lower side and a side reverse to a work milling direction, and which is characterized in that supporting surfaces of the supporting portions supporting the work from the lower side thereof are inclined towards the other supporting portions supporting the work from the side reverse to the milling direction and in that a clamp mechanism having clamp arms for pressing the work from the upper side thereof is disposed above the supporting portions.
According to this structure, the work can be supported without being effected by the difference in largeness of an error within the tolerance of the diameter of the journal portion, hence preventing the vibrations and noises from being generated and preventing the lowering of the machining accuracy.
Further, in the above structure, the inclination angle of the supporting surface of the supporting portion for supporting the work from the lower side will be preferred to be within a range of 10.degree. to 20.degree., more preferably of 15.degree..
According to a second structure of the present invention, there is provided a work support device as defined above, in which a roller abutting a
REFERENCES:
patent: 2577277 (1951-12-01), Schuly et al.
patent: 3736114 (1973-05-01), Okada
patent: 4276723 (1981-07-01), Tournier
patent: 4346535 (1982-08-01), Asano et al.
PCT Notification of Transmittal of Copies of Translation of International Preliminary Examination Report.
Howell Daniel W.
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
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