Metal working – Plural diverse manufacturing apparatus including means for... – With turret mechanism
Patent
1990-11-21
1992-09-15
Bilinsky, Z. R.
Metal working
Plural diverse manufacturing apparatus including means for...
With turret mechanism
408 35, 409211, 74826, B23B 3920
Patent
active
051466635
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a revolving head for machine-tool including one fixed frame, one spindle-bearer turret movable in rotation with respect to this frame, at least two tool-bearer spindles fitted to said turred, rotation devices of said spindles and automatic driving devices to rotate said turret, in which the turret includes a first element secured to said frame and a second element movable with respect to first element and in which said automatic driving devices include an axial piston and a rotary piston to move respectively axially and in rotation said second element of turret with respect to said first element.
Already known are several types of revolving head, manually or automatically driven, which generally are not satisfactory on machining units of classical type or with numerical control, especially those which are described in the FR-A-2 080 951 french patent application and in the U.S. Pat. No. 2,915,922. It should be noticed that both systems are quite different from the present invention in their principle and in their construction.
As a matter of fact, in revolving heads of previous design, tools are fixed, so that machining requires driving of part to be machined. In design of invention, tools are in rotation and parts are fixed. Thus the known devices can not carry out works carried out by revolving head of invention and do not have same flexibility of use and same reliability.
The present invention palliates said disadvantages by offering a revolving head of above mentioned type, characterized by the fact that frame axis forms a 45.degree. angle with turret axis.
According to a preferred embodiment, the axial piston has a rod integral with the turret first element and said fixed frame, and a cap integral with said turred second element and displaceable axially and in rotation with respect to said rod.
According to this preferred embodiment, the revolving head as per invention has a compression spring fitted between the piston basis and the turret second element, this spring being designed to bring said second element back against the first element of the turret after a relative axial displacement of both elements.
The spring is preferably, fitted partly in a first ring-shaped cavity made at the piston basis and partly in a second ring-shaped cavity made in the turret said second element, both these cavities being located co-axially with respect to said rod, one in prolongation of the other.
It is advantageously made of a stacking of Belleville washers.
According to a particularly advantageous construction, the rotary piston is fitted to the rod tip and is moused inside a cylinder chamber.
The axial piston can have at least one hollow, the turret of said second element having at lest one pin designed to take place into said hollow, and these devices being designed to make integral said axial piston, itself secured to the rod, with turret said second element when turret is axially displaced with respect to said first element.
Driving devices of spindles include preferably a driving gear secured to a driving shaft, this gear having a cylindrical piece and a trunk-conical piece, and a driving gear secured to a driving shaft of a spindle which is always engaged at least with the trunk-conical piece of the driving gear of the driving shaft.
Under this shape of construction, the generating lines of said trunk-conical piece form with the gear axis a 45.degree. angle, and are parallel to the rod axis.
The trunk-conical and cylindrical pieces of driving gear are advantageously pressed one against the other by a spring to be coupled. This spring is preferably made of a stacking of Belleville washers.
According to another advantageous construction, revolving head has a multicontactor housed in a cavity made in the frame, this multicontactor being designed to control electrical functions of this head, and at least two operating rods corresponding respectively to said tool-bearer spindles, and connected to operating pins corresponding respectively to each spindle and designed to actuate said
REFERENCES:
patent: 2915922 (1959-12-01), Treer
patent: 2956454 (1960-10-01), Hansen
patent: 3717417 (1973-02-01), Aubrier
patent: 4887345 (1989-12-01), Saito et al.
Bilinsky Z. R.
Somex Mulhouse S.A.
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