Turning – Lathe – With work feeder or remover
Patent
1988-06-03
1991-06-04
Schmidt, Frederick R.
Turning
Lathe
With work feeder or remover
82129, B23Q 704
Patent
active
050204025
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for machining both sides of workpieces, in which the workpieces are successively clamped in first and second spindles on a first or a second side, respectively, on a spindle drum comprising several spindles, in particular, with spindle axes which are parallel to each other and are arranged at equal angular spacings around a drum axis, and in which raw workpieces are fed to the first spindles, finished workpieces are removed from the second spindles, and half-finished workpieces are changed over from the first to the second spindles, with clamping of the workpieces being simultaneously changed from the first to the second side. The invention further relates to a multiple-spindle automatic lathe for machining both sides of workpieces with a spindle drum which comprises several spindles and on which successive first and second spindles are provided for clamping the workpieces on a first or second side, respectively, with a feeding means for raw workpieces, with a conveying away means for finished workpieces, with a workpiece gripping device and with a workpiece holding device which is associated with the workpiece gripping device and which together with the workpiece gripping device forms a handling unit for changing over the half-finished workpiece from the first to the second spindle, with the clamping of the workpiece being simultaneously changed from the first to the second side.
The machining of a turned part on a first and a second side, i.e., in particular, a front and a rear side, in a machining cycle is already known in multiple-spindle automatic lathes.
The Gildemeister publication GM 030 3 Bu 1076 d describes on page 40 a six-spindle automatic lathe with a spindle drum in which three successive spindle positions are used for machining the front side of a chucked part and three further successive spindle positions for machining a rear side. Herein the machining of the chucked parts is to be carried out in such a way that the chucked parts are inserted in one spindle position into the spindle drum, then first pass through the three spindle positions for machining the front side, are subsequently changed over prior to machining of the rear side, then pass through the three spindle positions for machining the rear side and finally after completion of machining of the rear side are conveyed away as finished parts.
Herein the feeding means for raw workpieces is associated with the first spindle position for machining the front side of the chucked parts so raw workpieces are always inserted into the spindles standing in this spindle position and are clamped by these spindles on their first side. By indexing spindle drum one spindle position or one step, in each case, the inserted raw workpieces with the spindles clamping them pass through all three spindle positions for machining the front side. Prior to machining the rear side, the workpieces are to be changed over in such a way that they are clamped on the second side. This is possible either in the last spindle position for machining the front side or in the first spindle position for machining the rear side. To this end, the workpieces are removed from the spindle clamping them on their rear side, reversed and put back into the same spindle which must now clamp the workpieces on their front side which has already been machined After passing through the three spindle positions for machining the rear side, the finished workpieces are transferred in the last spindle position for machining the rear side to the conveying away means for the finished workpieces.
In this apparatus described above, the spindles can only be equipped with such clamping means as allow simultaneous clamping of the chucked parts on the front and on the rear side. This may cause difficulties even with conventional parts as it is not always possible to clamp a part both on the first side and on the second side with the same clamping means.
Also, there is only a small number of spindle positions available for machining the workpieces since one spindle
REFERENCES:
patent: 4061060 (1977-12-01), Trautmann
patent: 4457193 (1984-07-01), Matthey
patent: 4612832 (1986-09-01), Ushigoe et al.
Article from "Konstruktion" 32 (1980), vol. 9, pp. 345-349.
Article from "Werkstatt und Betrieb" 114 (1981), vol. 4, pp. 241-245.
Link Helmut F.
Trautmann Gunther
Index-Werke KG
Schmidt Frederick R.
Shideler Blynn
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