We were able to customize the design of the function block to achieve the same type of functionality and performance compared to a stand-alone controller.” Other machines will control motion with a motion controller, a dedicated controller for servo-controls and positioning. “We provided a set of function blocks that gave R&B the position control with a PLC. “R&B is using a standard Siemens S-7 PLC to control these positioning motions,” says David Chin, a technician with NDC Technologies, a Siemens strategic partner in the controls upgrade. Clamp motions open and close the molds, blow pins move up and down, and carriages, which hold the clamps, move underneath the parison head, and then out to the blow station. It has two shuttles, two molds and two blow pins.
One particular R&B blow molding machine has nine axes of servo-hydraulics - three are for parison control and six are for motion control. Additionally, it offers machinery audits, machinery installation/removal, reconditioning, and metal cutting machinery services. The company also designs and builds custom equipment for various processing requirements and provides precision built blow mold and trim tooling products.
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It offers programmable controllers, touch screen operator interfaces, independent parison controls, inclined or horizontal machines, free standing platens with mold face compensation, in-machine trimming, single screw extruders, and trimmers and deflashers. In conjunction with Siemens Energy & Automation, Inc., R&B has successfully integrated the motion control functionality of its blow molding machines, including parison control, into off-the-shelf PLCs, and in the process increased productivity, reduced machine cycle times and cut costs by reducing the amount of components required.įounded in 1980 and is based in Saline, Michigan, R&B provides solutions for plastics machinery, molds, tooling, and trimming systems. However, recently the company decided it would be more efficient to control these hydraulic motions directly from its PLCs rather than having to use dedicated motion control cards. Its machines had been using closed-loop hydraulic motions with dedicated motion control cards, which are not only expensive, but also somewhat difficult to coordinate with programming. Like most blow molding original equipment manufacturers, R&B Plastics Machinery, LLC (R&B) has to coordinate different machine motions very closely. The PLC handles control functionality with built-in integration of parison control, synchronized camming of blow pins with carriages, linear positioning of shuttles and 30 zones of heat control.
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