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Automation Technologies 2/2015

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Automation Technologies 2/2015


SENSORS AND MEASUREMENT previous page 02 Light sensors with background suppression detect the currently inserted product and the correct assembly is of type AS Tronic 2 or TraXon EL 40. On the “lower level”, two BOS Q08M laser through-beam sensors check whether the two pins or sleeves are correctly inserted; another sensor checks whether the roller bearing is inserted and a fourth checks whether the case is of type TraXon EL 40. If this is the case, an additional detector is necessary, since the bearing shells of the TraXon EL 40 transmission have a small pin as anti-twist protection. To prevent shearing of the pin during the pressing process, the worker must insert the bearing with the correct radial alignment. An inductive sensor, also from Balluff, then checks whether the pin is in the intended opening and, thus, whether the bearing is correctly inserted. If this is the case, the bearing pushes up a small pin which actuates an inductive sensor. Only after this sensor switches does the release for the pressing operation occur. After the start button is pressed, the safety guard lowers. Indexing moves down and secures the case. A lifting unit lifts the case. At the same time, the roller belt lowers and a lateral support is extended. The spindle moves the upper part of the press downward at fast speed, stopping 3 mm before the lower position. AUTOMATION TECHNOLOGIES 2/2015

To simplify the pressing operation, the two bearing shell seats on the top side are automatically coated with an oil mist. The upper part of the press then moves downward with a force stroke and fully presses the two tapered bearing shells into the case. During this process, a spring-loaded and hydraulically clamped counter holder supports the case from above. Here, a hydraulic-pneumatic torque multiplier generates a hydraulic pressure of 200 bar that activates the hydraulic clamping sleeves in the counter holder. The upper part of the press with the pressing tool then moves upward to allow the lateral supports to retract. It then moves downward again to 3 mm before the start point of the pressing operation. The lower bearing shell and the two pins/sleeves are now pressed into the case. An intelligent equalizer compensates for potential component tolerances in real time. Following the pressing operations, the press returns to the home position; the roller belt and indexing move upward. Once the entire press is in the home position, the protective guard opens. The case can be pressed out of the press to the stop bar at the end of the roller belt. Photoelectric multi-talents With the BOS 23K, a light sensor with red light LED and HGA, the design engineers at NMH have chosen a powerful sensor with a scanning range of up to 1.2 meters. “Its particular strength,” according to Andreas Hummler, design engineer at NMH, “is the reliable detection of objects with various surfaces from a long distance. It is the ideal choice for this, as it functions even with shiny or dark objects against highly reflective backgrounds, such as the bearing shells, pins and sleeves in the system.” Handling of the sensor, which has gray value shift of just 3 % at a scanning range of 800 mm, is simple and practical. Thanks to its highly visible and well-defined light About Company name: Balluff GmbH Established: 1921 Headquarters: Neuhausen a.d.F., Germany Turnover: € 335 m (2013) Employees: more than 2750 Products: Sensors, Industrial RFID systems, IO-Link, … spot, it is also easy to align in daylight. The desired scanning range is set via an 18-turn potentiometer with easy-to-use display window. The sensor, whose output can optionally be changed between an output and break contact (N.C.), is ideally suited for use in rough environments, such as in the universal press. In addition, it is equipped with a robust, fiberglass-reinforced plastic housing in enclosure rating IP 67 and IP 69K. A lateral optics guard also prevents possible damage to the Fresnel lenses. Considerably smaller than the light sensors with HGA are the laser through-beam sensors of Balluff series BOS Q08M in robust, cubic metal housing of protection class IP 67, which NMH uses for object detection in the lower level. These are particularly compact miniature sensors. They convince not only with their very compact design of just 44 x 8 x 8 mm, but also with their high precision. With their sharply focused laser beam, they detect even parts as small as 0.28 mm with a switching frequency of 400 Hz. “We use them everywhere,“ says Wahl, „where components with low space requirements, low weight and high switching precision for repeated positioning are needed.” Photographs: teaser and background fotolia AUTOMATION TECHNOLOGIES 2/2015


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