Page 28 - MetalForming September 2017

Hydraulic
Presses:
Frame Selection
There’s a variety of press frames, and each offers advantages depending on the application. Here’s a rundown.
For some hydraulic press users, knowledge of press-frame styles and the applications they are best suited for may be limited to whatever press is on the shop floor. However, there are many available hydraulic- press-frame styles and familiarity with their characteristics will help guide metalformers in deciding which is best for their needs. With that in mind, here’s a rundown of the various frame styles.
Monolithic
• High stiffness and torsional rigidity for improved off-center-loading capa- bility and low deflection
• Precision machining of frame due to lack of build-up tolerances associ- ated with machining multiple frame components separately
• Adjustable eight-point gib or tem- perature-compensated guiding
• Low field-assembly costs because of single-piece frame
• Accessibility to all four press sides for material flow, die change and maintenance
• Suitable for single frame weights to 80 tons
Jeremy Neil is vice president of opera- tions for Macrodyne Technologies Inc., Concord, Ontario, Canada; 800/336- 0944, www.macrodynepress.com.
BY JEREMY NEIL
Monolithic press frame with rolling bolster
• Suitable for presses in capacities to 2500 tons, depending on bed size
• Practical bed sizes as large as 120 by 96 in., depending on tonnage
• Suitable for single-acting, single- acting-with-cushion, double-acting or triple-acting metalforming applications
• Accommodates front-to-back or left-to-right rolling bolsters
Housing
• High stiffness and torsional rigidity for improved off-center-loading capa- bility and low deflection
• Frame components (bed, slide, crosshead and housings) are pre- stressed together with tie rods and pre- stressing nuts
• Accessibility to all four press sides
• Adjustable eight-point gib or tem- perature-compensated guiding
• Suitable for individual frame-com- ponent weights to 150 tons (depending on the press manufacturer’s capabili- ties)
• Allows for larger bed sizes, in excess of 300 in. left-to-right
• Suitable for single-acting, single- acting-with-cushion, double-acting or triple-acting metalforming applications
• Can incorporate front-to-back or left-to-right rolling bolsters
• Ability to dismantle frame allows
26 MetalForming/September 2017
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Housing press frame with rolling bolster