Manufacturer: Polygon

Polygon

The fluid power industry is driven by performance and value, two areas in which the composite industry thrives. For years, aluminum and other similar metallic materials have dominated cylinder product applications. Today, Polygon's POLYSLIDE™ products are challenging this metallic paradigm with advanced composite cylinder tubing materials.

polygon cylinder

Introduction

POLYSLIDE™ cylinder tubing offers many unique features to the Fluid Power Industry including pneumatic and low-pressure hydraulic applications. By providing a more versatile cylinder material than the traditional metallic cylinder tubing, POLYSLIDE™ cylinders can be a direct replacement in current applications. Opening new design opportunities by eliminating limitations that are common to metal cylinders. POLYSLIDE™ is available in various ways, from a simple cylinder tube cut to length for customer assembly, to a completely designed cylinder system according to customer specifications. Polygon has the technology to assist cylinder manufacturers in the use of POLYSLIDE™ cylinders, this includes our internal testing facilities to validate designs to match our customers' specifications. Polygon's in-house capabilities range from cycle testing, burst pressure chamber testing with video analysis of failure mechanisms, to in-use frictional analysis.

polygon tubes

The patent pending bore surface of the POLYSLIDE™ cylinder is designed to reduce the common causes of seal wear. Friction is the primary cause of seal wear. There are two types of friction that tend to oppose each other in the design of the bore surface. These are adhesion and interlocking friction. Adhesion Friction is the physical attraction of two smooth surfaces brought into close contact with each other. As the contact area increases so does the adhesion between the surfaces. A smooth surface reduces the gap between the surfaces resulting in higher adhesion. Adhesion acts as a frictional force when the one object slides against the other. The friction between O-ring seals and bore surfaces increases significantly as the surface finish of the bore is reduced from 16 Ra to 6 Ra. Therefore, a higher Ra bore surface finish will reduce the seal adhesion friction and thereby extending seal life. Interlocking Friction is the result of shear forces encountered from the interlocking of irregularities between contacting surfaces during sliding motion. By the nature of machining surfaces, such as boring or honing of metallic cylinders, microscopic rough edges exist that tend to penetrate and shear the softer seal material, thereby reducing seal life. Obviously, for metallic cylinders a lower Ra bore finish specification (smoother surface) is desirable in reducing the interlocking friction resulting in extended seal life. Typically, the means of achieving the optimum Ra finishes for the two types of frictional conditions oppose each other. Historically, users of metal cylinder tubing must compromise their specification of the Ra value in an attempt to create an ideal bore finish. One of the unique features of the POLYSLIDE™ bore surface is that it is not formed by a machining process, but by a molding process. Another feature is that the wear resistant material at the bore surface is microscopically round in nature. Taken together, these features allow the seal to naturally slide over the bore surface contour. These two features minimize interlocking and adhesion friction.

Since interlocking friction is not a significant issue with the POLYSLIDE™ bore surface, the Ra finish does not play the same role as in conventional metals. POLYSLIDE™ cylinder contact surfaces are rounded and cylindrical.

The topographic advantages of the POLYSLIDE™ bore surface, is the actual material composition of the sliding surface itself. Lubricants are incorporated within the bore surface material for the purpose of lowering the surface tension at the bore surface with respect to the seal material. Also, wear resistant additives are incorporated within the bore surface material that results in a very hard wear surface with a Rockwell hardness of 50°C to 60°C.

Products

Literature

Cylinder_catalog
Cylinder Catalog
Manufacturer: Polygon
Literature
[ Download ] (6261kb)
 
© 2017 Air-Oil Systems, Inc.
All Rights Reserved.