Reivindicaciones

1. A measurement installation for the lathing parameters of a railway section of the type permitting high precision measurement of the rolling parameters in wheels (R) fitted on railway vehicles, before and after the lathing process, performing said measurement over a pit lathe or a unit for machining profiles, while the wheel is supported without rotating on the pit lathe or in said machine and being included among said rolling parameters, measurements of the wheel flange thickness and height, the factor qR of the wheel and the distances between driving faces and the internal faces of opposite wheels (R), characterized in that it comprises, for each wheel (R) to be measured, a measurement probe (3) fitted on a support block (1) joined to a tool slide (7) of the lathe; a feeler or probing head (4) incorporated in the measurement probe (3) and destined to enter in contact with the wheel (R) to be measured; an activation cylinder (2) destined to vertically displace the probe (3) together with the feeler (4) until a suitable measurement position; a supply and data output cable (5) joining the probe (3) to the numerical control (NC) of the pit lathe and which receives the data obtained by the feeler (4), this being displayed on the screen of the numerical control (NC) and transmitted to a computer (C) to be ordered and filed by the latter according to a protocol and afterwards, the protocolized data being sent to an external maintenance system; and a cowling (6) arranged on the lower part of the support block (1) to protect the sensitive parts of the measuring equipment. 2. An installation according to claim 1, characterized in that the cylinder (2) is a pneumatic cylinder. 3. An installation according to claim 1, characterized in that the cylinder (2) is an hydraulic cylinder. 4. An installation according to claims 1 to 3, characterized in that the computer (C) is a personal computer (PC). 5. A measurement process for the lathing parameters of a railway section, wherein the installation is used according to the preceding claims 1 to 4, characterized in that it comprises the steps of setting the numerical control (NC) in the "measurement" operation mode; activating the measurement probe (3) to caube it and the feeler (4) to be displaced by the cylinder (2) to a suitable measurement position; activating a "measurement sub-programme" to make the feeler (4) touch the wheel (R) section at several points to be measured and send the coordinates obtained with the X and Z axis coders of the tool slide (7) to the numerical control (NC) by means of the electric connection cable (5); indicating the data obtained on the screen of the numerical control (NC) and transmitting it to the computer (C) to order and file it according to a protocol; and, optionally, sending the protocolized measurement data to an external maintenance system.