Guide-bar device for automatic lathe and method of fabrication thereof

Guide-bar device for receiving and guiding bar stocks of different diameters and/or profiles to be machined in an automatic lathe, comprising:

• a cylindrical body having a length at least equal to the length of the bars to be machined with a longitudinal axis running the length thereof;
• a plurality of tubular members forming tubular cavities of different diameters for receiving and guiding the bars to be machined, said tubular cavities being arranged in said cylindrical body parallel to the longitudinal axis of said cylindrical body, and said tubular cavities being capable of comprising on their whole length oil distribution channels for dipping said bars to be machined;
• said cylindrical body including a peripheral ring connected by reinforcing ribs to each of said tubular members, each of said tubular members being further connected by reinforcing ribs to adjacent tubular members, said reinforcing ribs enhancing the moment of inertia and hence the rigidity and the stability of said cylindrical body;
• and
• said cylindrical body also including a plurality of cavities of substantially triangular shape formed by said peripheral ring and each pair of adjacent tubular members connected by said reinforcing ribs, and said plurality of cavities being capable of comprising on their whole length oil return channels.

Guide-bar device for receiving and guiding bar stocks of different diameters and/or profiles to be machined in an automobile lathe, comprising:

• a cylindrical body having a length at least equal to the length of the bars to be machined with a longitudinal axis running the length thereof;
• a plurality of tubular members forming tubular cavities of different diameters for receiving and guiding the bars to be machined, said tubular cavities being arranged in said cylindrical body parallel to the longitudinal axis of said cylindrical body, and said tubular cavities being capable of comprising on their whole length oil distribution channels for dipping said bars to be machined;
• said cylindrical body including a peripheral ring connected by reinforcing ribs to each of said tubular members, each of said tubular members being further connected by reinforcing ribs to adjacent tubular members, said reinforcing ribs enhancing the moment of inertia and hence the rigidity and the stability of said cylindrical body;
• and
• oil distributing means for distributing oil being located at a rear part of said cylindrical body, an oil collector located at a front part of said cylindrical body and means permitting a return of the oil to a hydraulic group feeding said device with the oil under pressure in a closed circuit.

Guide-bar device for receiving and guiding bar stocks of different diameters and/or profiles to be machined in an automatic lathe, comprising:

• a cylindrical body having a length at least equal to the length of the bars to be machined with a longitudinal axis running the length thereof;
• a plurality of tubular members forming tubular cavities of different diameters for receiving and guiding the bars to be machined, said tubular cavities being arranged in said cylindrical body parallel to the longitudinal axis of said cylindrical body, and said tubular cavities being capable of comprising on their whole length oil distribution channels for dipping said bars to be machined;
• said cylindrical body including a plurality of reinforcing ribs connecting each of said tubular members to adjacent tubular members, said reinforcing ribs enhancing the moment of inertia and hence the rigidity and the stability of said cylindrical body;
• said cylindrical body including means for angularly positioning which permit in cooperation with fixed external means a precise indexing of said cylindrical body;
• and
• oil distributing means for distributing oil including a cap being located at a rear part of the cylindrical body, an oil collector located at a front part of the cylindrical body and means permitting a return of an oil to a hydraulic group feeding said device with said oil under pressure in a closed circuit.