Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1981-01-30
1983-08-02
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
408159, 408172, 408182, B23B 4700, B23B 4718
Patent
active
043963200
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a boring unit with a rotatably driven bored tool spindle for exchangeably receiving a boring tool in a tool carrier tiltable perpendicularly to the axis of the tool spindle, which is supported by a support arm on a slightly oblique wedge surface of an adjustment member axially slidable in the tool spindle by means of a connecting rod.
In a known boring unit of such type (DE-OS No. 2,040,020), the boring tool is screwed and centered on the face of the tool support which simultaneously serves for tool receiving. For an exchange, the boring tool must be unscrewed from the tool support. A faster or even fully automatic tool exchange is not possible with same.
In known fully automatic tool exchange devices, the tool is provided with a taper which is held in a taper socket by a headbolt mounted on the taper. Balls arranged in a ring-shaped array, which are movable by a chucking cage axially along an oblique surface disposed in the spindle bore, pull the headbolt inwardly when the chucking cage is pulled back by the action of a tension spring. In order to loosen this chucking of the headbolt, the chucking cage is moved forward by means of a connecting rod arranged in the bored spindle until the balls release the headbolt.
In this known headbolt chucking the space available in the spindle bore is required for the parts of the headbolt chucking; in the known boring unit mentioned at the outset, the spindle bore is required for receiving the support arm, the axially slidable adjustment member and the connecting rod connected with same, in order to provide for the desired tilting motion of the boring tool. Only the face is available for the exchangeable attachment of the boring tool to the tool support.
Thus, it is an object of the invention to so structure a boring unit of the type mentioned at the outset, that a fully automatic tool exchange can follow without impairing the tilting motion of the boring tool or necessitating an engagement at the forward end of the spindle for release or chucking of the tool.
According to the invention, this object is so solved that the boring tool is arranged for being chucked in the tool support by means of a headbolt chucking through balls, which are movable along an oblique surface by a chucking cage axially slidable in a bore of the supporting arm, and that the connecting rod, tilting at the end of its axial stroke, the adjusting member and the tool support, enters into engagement, over a stop means, with the chucking cage maintained in its chucked position by tension springs, and axially shifts same for release of the headbolt.
The parts of the headbolt chucking are thus accommodated in the interior of the supporting arm. For the actuating of the headbolt chucking, the connecting rod is used which also axially shifts the adjustment member provided with the wedge surface. At the end of its adjustment stroke, the connecting rod can be brought over a stop means, into engagement with the chucking cage of the headbolt chucking in order to release the headbolt chucking. When this engagement is again released, the headbolt is again chucked. In this way, a fully automatic tool exchange can be achieved even in a boring unit with a boring tool tiltable sidewise for radial adjustment of the cutting edge, whereby even a separate actuating device for the release of the tool is not necessary. No engagement at the forward spindle end is required for the process of the chucking or releasing of the boring tool, which would be time consuming and complicated. At the forward spindle end only the boring tool to be exchanged is gripped and withdrawn and another boring tool inserted.
Due to the very small space requirement of the parts required for the tool chucking according to the invention, it is possible in a structurally very simple way to provide in the connecting rod and in further parts attached to the boring tool a central coolant conduit.
Further embodiments of the inventive concept are the subject of dependent claims.
In the following, the invention will be explain
REFERENCES:
patent: 3120765 (1964-02-01), Briney et al.
patent: 3583280 (1971-06-01), Hart
patent: 3744924 (1973-07-01), Levosinski et al.
patent: 3749508 (1973-07-01), Schukrafft
patent: 3753624 (1973-08-01), Walker et al.
Bellmann Bernhard G.
Horsch Wilfried
Wolf Wilhelm
Briggs William R.
Kline Thomas M.
Santrade Ltd.
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