摘要:
A fixed carrier for machine tool parts includes a table frame and a table having a first face That can hold a first part to be machined, the first face being fixed above a machining device and the first part being stationary during the machining process. The table also has a second face for holding steady a second part to be machined.
摘要:
A machining device has a machine head capable of displacement along at least three translation axes X, Y, Z for machining an immobile part fixed above the machining head. The machining head is maintained in a constant orientation by at least three articulated connecting rods. Two connecting rods define together with the machining head and with a first Y carriage, on which they are articulated, an deformable articulated parallelogram in the XZ plane. Another connecting rod is articulated on the machining head and on a second Y carriage and the second Y carriage is capable of displacement along Y on a second X carriage capable of displacement along X. The relative movement along X of the Y carriages results in a displacement in the Z direction. Several devices can be positioned in a plurality of tunnels, these tunnels being arranged so as to share several things.
摘要:
The charge of the invention comprises a plate placed between the explosive charge and the liner. The diameter of the plate is equal to the internal diameter of the casing of the charge. The material used for the plate must be such that its density is lower than or equal to that of the material used for the liner and must have a volumetric compressibility modulus greater than or equal to 100 GPa, with the thickness of the plate greater than or equal to that of the liner at any point of a central area surrounding the axis of the charge, so as to ensure that upon initiation of the charge the centripetal deformation of the plate will be less than that of the liner.
摘要:
The invention relates to the manufacture of a composite material part by shaping a fibrous reinforcement texture and densifying the texture by chemical vapor infiltration of the material constituting the matrix of the composite through the porosity of the texture. Before densification, the texture is separated from an adjacent structure, such as an adjacent surface of a tool (12, 14) inside which the texture is held, or another texture, by means of an inserted layer (10) of fabric produced in a refractory material having a thermal expansion coefficient different from that of the constituent material of the texture.
摘要:
Sintered ceramic elements are associated to at least one composite material layer having a fibrous reinforcement arrangement and a ceramic matrix located behind the sintered ceramic elements.
摘要:
The disc consists of a core (1), being a hub (3) surrounded by spokes (2), and friction pads in the form of annular sectors (8) having recesses (15, 16) in their inside backs (10) to cooperate with the spokes (2) in providing radial guidance and angular locking. Elastic means are provided for removably axially mounting the sectors on the core (1), which elastic means (19, 6) also serve to removably radially mount the sectors on the core.
摘要:
A device enabling the ignition of at least two explosive charges using a single detonator, device wherein it comprises at least a first pyrotechnic booster that is ignited by the detonator, a first booster that firstly ignites a first explosive charge by projecting a casing onto it and which is secondly connected to a second explosive charge by at least one detonation wave transmission booster.
摘要:
The invention relates to a wall (2)-protection device (1), notably for a vehicle wall, against attack by a projectile. This device comprises at least one explosive charge (3) able to project at least one metallic block (7) in the direction of the projectile. The device is characterized in that the block or blocks (7) are in the shape of elongated bars, that is which have a maximal length greater than or equal to 10 times their smallest crosswise dimension, the explosive charge (3) being position opposite a longitudinal surface of the bar (7).
摘要:
A vehicle bumper with shock-absorbers, including a rigid support attached to a vehicle onto which a bumper shell is fitted, the shock-absorbers including at least two pyrotechnic actuators linking the rigid support to the vehicle, the actuators being connected for activation by a control system including an impact or deceleration sensor, and each pyrotechnic actuator including at least two gas-generating powder tablets to be primed individually by the control system.
摘要:
A fibrous preform (10) of the component to be manufactured is conformed in the desired shape with the desired degree of compacting, prior to densification by chemical vapor deposition. The conformation is achieved by linking the preform (10) onto a rigid shaping device (12) by threads (30) that traverse the preform (10) and pass through holes (14) in the shaping device. The linking threads (30) are made of carbon or ceramic. Prior to the linking, a covering layer (16) may be arranged on the face of the preform (10) opposite to the one turned towards the shaping device.