SAPHIR, Signal Physique et Intrumentation

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LabVIEW correct the valve seats on machines SERDI

The application made under LabVIEW can drive the 5.0 S machine via a CAN communication card and a data acquisition card

J-F Berger (Machines SERDI) and D. Caiola (SAPHIR)

The goal: drive a machine to machine valve seats boring and valve guides, and any equivalent operation: drilling, lamage.

The solution: use a PC, LabVIEW, CAN hardware and data acquisition to achieve the implementation steering.

SERDI machines, based in Annecy, the world leader in construction machinery repair of cylinder heads and more particularly grinding valve seats. Saphir, Grenoble services company, partner of National Instruments has made the development of an implementation steering SERD.

The Serdi 5.0, the newest machines SERD, is the first of this range to offer a semi-automatic mode. At a cost of 350 kF, it is used by manufacturers of small series, preparers engine competition and grinder. It has a manufacturing capacity of 14 to 120 mm and uses a patented triple air cushion to ensure a perfect centering of the tool before machining. S 5.0 works by learning: it is to record and analyze the actions of the operator during the processing of the first seat to reproduce in semi-automatic mode on all other seats. This mode of operation ensures the quality of workmanship (concentricity, surface, depth of seat) with excellent repeatability, while reducing cycle time for machining a cylinder head and s'affranchissant of any programming.

System implementation
To develop semi-automatic mode, many mechanical innovations were necessary, but also for the first time, a PC and application steering are integrated into the machine. The PC running Windows 98 driver two screens with two different visuals. The first screen, touch, is manipulated by the operator and centralize the functions of piloting the machine. Another screen to indicate the name of manufacturer, type of breech ... to populate an Access database. These data are then forwarded to the software LabVIEW graphical programming and the machine is ready for use.

"We are pleased with the application and particularly appreciate the flexibility of software. When we installed the application in the United States, Ford EMDO, they wanted to use the correction, which was not set up to origin. The changes were implemented immediately by SAPHIR. An hour later, it was completed and functional: the client was delighted. "

A PCI-CAN is leading a National Instruments Moog brushless motor via the CAN protocol, to control the movements of the working-spindle. A data acquisition card PCI-1200 multifunction National Instruments two pilot valves for blocking / unblocking of the machining head at the center of the tool and a drive manager SIEMENS speed of rotation of the spindle. The digital and analog inputs of the card lets you, among other things, air pressure, the actions of the operator on the engine and the speed of rotation of the spindle.

The application was made by SAPHIR in two months and gives complete satisfaction. SERD machines are mainly sold abroad, a multilingual application was sought. SAPHIR has developed a technique where all texts are translated and centralized classified into a text file. The customer can easily add additional languages. The application also adapts to different measurement units (millimeters, inches ...).

The CAN protocol and LabVIEW were chosen because they are standard in the automotive world. Today, all machines are sold S 5.0 with the application that is distributed as an executable. This ensures that the operator will not modify the software. In the future, we plan to develop the application in controlling a second axis.

For more information, please contact
Didier Caiola
SAPHIR
BARRAUX 38530, France
Tel. : 04 38 92 15 50
E-mail: info@saphir.fr
November 1999

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