Turning – Process of turning
Patent
1986-01-02
1987-06-16
Godici, Nicholas P.
Turning
Process of turning
82 30, 279 4, 414 17, B23B 1302, B23B 1312
Patent
active
046728694
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a guiding and feeding device for a work bar in a lathe, comprising a hollow spindle which includes a chuck at one end and behind the same and spaced from each other at least two guide sleeves for the work bar, and a stock feeder for advancing the work bar in a direction toward the chuck.
With known guiding devices of this kind (journal "tz fur Metallbearbeitung" no. 5/83 and no. 6/83) there are three guide sleeves stationarily arranged within the spindle, the first one directly behind the chuck and the other two at uniform spacings behind the same. The guide sleeves have an inner diameter closely adapted to the outer diameter of the work bar to be processed. A bar material magazine is arranged behind the spindle and comprises a plurality of roller sets between which the work bar is rotatably supported. A telescopic stock feeder is coordinated with the bar material magazine and disposed coaxially with the work bar behind the latter. It comprises an axially displaceable tubular outer feeder as well as a rod-like inner feeder guided for axial displacement in the outer feeder. The diameter of the inner feeder is smaller than the diameter of the work bar.
When a new work bar is introduced from behind into the spindle and its guide sleeves as well as the chuck, with this known arrangement, the rear end of the work bar is supported and held centered at the front end of the outer feeder. During operation of the lathe the work bar is fed step by step by the stock feeder, the outer and inner feeders moving in common until the front end of the outer feeder has reached a position at a small distance behind the rearmost guide sleeve of the spindle. Further forward movement of the outer feeder is impossible since its outer diameter is larger than the inner diameter of the guide sleeves. The further advance of the work bar is taken care of by the inner feeder which now is being pushed forward with respect to the outer feeder, penetrating the guide sleeves one after the other and finally the chuck until the work bar has been used up and any possible remainder has been ejected by the inner feeder in forward direction through the chuck.
The guide sleeves are exchangeable so that in each case guide sleeves can be used whose inner diameter is closely adapted to the diameter of the work bar. Yet the stock feeder, particularly the inner feeder is used unchanged for work bars of different diameters because it would be too expensive to restructure the stock feeder for each change of stock diameter. For this reason normally the outer diameter of the inner feeder cannot be adapted closely to the inner diameter of the guide sleeves in the spindle. Consequently there is more or less great radial clearance for the inner feeder in the guide sleeves. The same applies in the event that the stock feeder is not of telescopic design but instead includes a single rod only of slender configuration to be slipped into the guide sleeves.
In both cases guide sleeves adapted to the diameter of the bar material cannot guide the stock feeder at the same small radial clearance as the work bar. Thus the front portion of the stock feeder which has entered the guide sleeves tends to become somewhat eccentric within the spindle and, as a result, it causes vibrations in operation. In certain rotational speed ranges to be passed by the spindle, these vibrations may become so strong that they impair the quality of the workpiece processing.
On the other hand, if one or more rear guide sleeves for the work bars are dispensed with so as to provide room for a sturdier stock feeder instead, this entails the risk that small diameter work bars will buckle inside the spindle.
It is the object of the invention to remove as far as possible the causes for such vibrations of the stock feeder and the risk of buckling of the work bar within the spindle of a guiding device of the kind specified initially.
This object is met, in accordance with the invention, in that the rear guide sleeve most remote from the chuck has an abutment face remote from
REFERENCES:
patent: 1356311 (1920-10-01), Reilly et al.
patent: 2639494 (1953-05-01), Belshaw
patent: 3933061 (1976-01-01), Link
patent: 4130289 (1978-12-01), Zajac et al.
Gawronski Seweryn
Hasslauer Heinz
Godici Nicholas P.
Kearns Jerry
Traub GmbH
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