Parker Hannifin has published a catalogue detailing the features and specifications of its range of HMI/HMD cylinders. Parker’s compact HMI/HMD cylinders are designed to move, position or clamp tools or work-pieces in a variety of applications, ranging from automation and machine tool systems, to presses, injection moulding and die cast machines, and are available with bore sizes of between 25mm and 200mm.
As well as this functional flexibility, the cylinders offer exceptionally long service life due to number of features. The piston rods used are manufactured from precision ground, high tensile carbon alloy steel, and induction case hardened to Rockwell C54 minimum, before being hard chrome plated and polished to a maximum of 0.2µm, resulting in a tough, dent-resistant surface. Likewise, each cylinder body is precision manufactured to minimise internal friction and prolong seal life. The life of the glands and seals is also extended by efficient double lip sealing, preventing the ingress of dirt into the cylinder, with the lipseals being manufactured from enhanced polyurethane, giving efficient retention of pressurised fluid and a service life of up to five times that of traditional seal materials.
Parker’s HMI/HMD cylinders are of exceptionally robust construction. They are able to withstand working pressures of up to 210 bar, due to their proven and reliable tie rod design that imposes a compressive force on the cylinder tube, which counters the tensile forces generated by system pressure. The extensive HMI range meets the requirements of ISO 6020/2, with the HMD range of cylinders also satisfying the DIN 24 554 standard.