Custom Hydraulic Cylinders for Metallurgical & Heavy Machinery

For the plastics and rubber processing industry, Tianjin Uranus Hydraulic Machinery Co., Ltd. designs custom hydraulic cylinders that provide precise, repeatable force and speed control for injection molding machines, blow molding machines, and rubber presses. As a national high-tech enterprise with over 30 years of experience, we understand the critical requirements of these applications: high cycle rates, low maintenance, clean operation, and integration with machine control systems. Our custom cylinders for injection molding machines are typically double-acting, with bore sizes from 50 mm to 400 mm and strokes from 200 mm to 1,500 mm. They feature low-friction seals, precision-ground rods, and optimized porting to achieve fast response times. We offer cylinders with integrated pressure transducers for cavity pressure control, as well as position sensors for closed-loop control of injection and clamping movements. For a German injection molding machine manufacturer, we developed a custom injection cylinder with a special coating on the rod to resist wear from abrasive fillers such as glass fibers. The cylinder also features a double-seal arrangement on the piston to prevent cross-port leakage, ensuring consistent shot weight. After extensive testing, this cylinder demonstrated a service life of over 10 million cycles. In blow molding, our custom cylinders are used for parison programming, mold closing, and bottom blowing. These cylinders must operate at high speeds with extreme precision. We offer cylinders with integrated servo valves and high-resolution position feedback for the parison programming function. For an Italian blow molding machine builder, we supplied a set of mold closing cylinders with mechanical synchronization to ensure even clamping force across large molds. The cylinders are equipped with cartridge-type seals for easy replacement, reducing downtime. For rubber presses, our custom cylinders are designed to withstand high temperatures from heated platens. We use high-temperature seals made from Viton or Kalrez, and we incorporate heat shields and water-cooling passages when necessary. For a Japanese tire manufacturer, we provided custom cylinders for a tire curing press, with a bore of 500 mm and a stroke of 800 mm. The cylinders operate at 250 bar and 180°C ambient temperature, and they have been in service for over seven years with only routine seal replacements. Our design process includes simulation of the cylinder's thermal expansion and seal compression to ensure proper function at operating temperature. We also offer custom machining of mounting surfaces to fit specific platen dimensions. All cylinders are tested on our dedicated test stands, including full-stroke cycling under pressure. We provide a detailed test report and a two-year warranty. For a custom cylinder solution for your plastics or rubber processing equipment and a quote, please contact our engineering team.