Abstract: The invention concerns a very high-speed machining machine-tool (M) consisting of a parallel structure including link bars (100) whereof one first end (110) is linked to a mobile member (200) supporting at least a tool and whereof the second end (120) is linked to at least means (300) setting it in motion relative to a frame (B). The said machine-tool is characterized in that the linkages (400) to the ends (100 [sic, should be 110. -Translation Editor) and 120) of the said bars (100) consist in an association of fictitious pivots (410, 420, 430) so as to form a joint whereof the degrees of freedom enable the parallel structure to be set in motion. The said feature enables to avoid all drawbacks related to ball linkages. The invention is applicable to high-speed machining.

Abstract: A device for using a parallel structure designed for positioning and displacing a mobile member including at least a fixed element and at least three actuators each including a fixed part and a mobile part, the mobile member including a support-sheath of a tool spindle. The device includes a balancing assembly which, enabling the support-sheath to move in rectilinear manner along axes X, Y and Z, maintains the support-sheath such that the weight of the support-sheath is not transferred to the parallel structure.

Abstract: A method for lengthening the machining travel of a machine-tool operating at a very high speed, including a tool-carrying ram mobile on three axes. The method combines with the machining movements of the tool-carrying ram along one or several axes, one or several rectilinear movements of the part to be machined by parametering and digitizing the relative travels and speeds of the part to be machined with respect to the tool-carrying ram. The invention also concerns the device for implementing this method and the machine-tool using such a device.

Abstract: A machining machine-tool having a fixed frame with a closed structure. The machining zone is delimited by the fixed frame internal surfaces and includes a machining head supporting the driving unit of a machine-tool. The machine-tool fixed frame has a C-shaped profile, and ends of branches of the C are linked to the machine-tool machining head. The ergonomic arrangement of the machine-tool functional parts is also considered.

Abstract: The invention concerns a method for machining crankshaft comprising the following main operations: determining starting points; machining the ends, bearings and crank pins; producing lubricating oil holes; finishing the ends, bearings and crank pins, dynamic measurement and optionally removing material for balancing purposes. The method is characterized in that it consists in carrying out dynamic mass measurements and eliminating material for balancing purposes, before the finishing operations. The invention also concerns a device for implementing said method. The invention is applicable to production lines machining and balancing crankshafts.

Abstract: A high speed machining machine tool (M) of the type that allows the independent setting into motion along at least three axis of two tool carrying slide (100 and 100′). This machine tool implements said motions of each slide by linear motors.

Abstract: A protection device (D) for the driving mechanism of a mobile element (O) against the cuttings of a machine tool includes a driving section (P1) and a machining zone (P2) separated by a protection wall. The protection wall is constituted by a plate (100) having a free translational motion on a disk (200) rotating freely with respect to the wall. A first displacement window (210) in the disk (200), and a second displacement window (310) in the wall are provided wherein both displacement windows (210 and 310) are arranged with respect to each other in such a way that the translational displacement of the plate (100) and the rotation of the disk (200) occlude the opening of both displacement windows (210 and 310).

Abstract: A tool storage and tool exchange device of a high speed machining machine-tool having a horizontal ram that receives a tool. The exchange device includes a tool storage module that has a multiplicity of housings receiving the tools, a handling module that loads or unloads at least one tool from a housing and transports the tool from the housing toward an exchange zone with a transfer module, and a transfer module that transports a tool present in the ram from an exchange zone with the ram toward the exchange zone with the handling nodule and vice-versa. The multiple modules allow simultaneous execution of different operations by a tool storage and tool exchange device.

Abstract: A method for machine a V crankshaft. A measurement is made of the dynamic mass and the centering points are drilled. The reference surfaces are preset by machining the raw crankshaft reference surfaces before the dynamic mass measurement.