JVH Engineering Inc., a systems integrator that retrofits Allen-Bradley control systems onto injection molding machines, said it has rebuilt a 700-ton, 1986 Milacron press by integrating an AB unit and Rexroth Bosch Corp.'s DPQ-2X for clamp injection and part ejection, and DPC for clamp control.
The hydraulic system of the press was upgraded with a 4WRTE-type proportional valve.
Grandville, Mich.-based VH retained the existing valves for the clamp cylinder and ejector cylinder, which are 4WRZ open-loop, proportional valves.
Pilot valves were replaced on the existing valves with a newer, integrated-electronics version. The change made the older valves adequate for closed-loop control of the clamp and ejector cylinders.
JVH found the rebuilt Milacron press performed well on hydraulic response, speed linearity, load compression, clamp repeatability, ejector repeatability and other parameters.
Tel. (616) 531-9861, (616) 531-7763.