Product Overview When designing molds with sliding cores, the mold designer is often faced with the challenge of fitting all traditional components in as small a mold base as possible. There are different methods of actuating a sliding core, the most common of which uses horn or angle pins (Fig. 1) to move the slide when the mold opens or closes. Heel blocks are normally used behind the sliding core to withstand injection pressure acting on the sliding core. Not only do these components use up precious mold space, but they are tied to the movement of the platen. Some molded parts also require that the sliding core be moved prior to opening a mold. While it is possible to use standard cylinders (Fig. 2) to actuate the sliding core or heel block, typical designs require additional mold design and machining, and waste mold space. HYDRAULIC LOCKING CORE PULL CYLINDERS Benefits, Cost Savings and Product Overview
HYDRAULIC LOCKING CORE PULL CYLINDERS The HLCP Cylinder Advantage
Cylinder Bore
The Hydraulic Locking Core Pull (HLCP) Cylinder replaces traditional slides and heel blocks, enabling independent movement of the sliding core while eliminating the need for a heel block. By using a segmented ring that presses into an internal groove inside the cylinder assembly while in closed position, the injection pressure from the part cavity acts against the cross section of the segmented ring, eliminating the need for heel blocks. Eliminating separate heel blocks or additional cylinders can result in a smaller mold base size, simplifying mold designs and increasing cost savings! The HLCP Cylinder is a robust, compact design. Available in seven sizes, each size has two available standard strokes. Due to the modular design of the HLCP Cylinder, special strokes are available upon request with quick delivery. The cylinder is constructed of hardened steel for extra long service life. Because of the cylinder’s special design and breadth of assembly sizes available, a wide range of holding forces are possible with a hydraulic holding pressure of only 870 PSI minimum.
Rod
NOTES:........................................................................................... Special stroke lengths are available upon request. Shown with required spacer used for setting preload when shutting off on core face.
Fig. 1. Slide Movement example using an angle pin and locking with a heel block (wedge).
Fig. 2. Slide Movement example using a
hydraulic cylinder to actuate slide, and a separate cylinder to actuate the heel block.
Fig. 3. Slide Movement example using the Hydraulic Locking Core Pull Cylinder.
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