Parkway-Kew Advanced Thermal Spray Coatings

Thermal Spray HVOF Coatings for the Wire Industry

 

Learn About The Parkway-Kew Difference
Parkway-Kew Corp. is a full service supplier of hardsurfaced wire drawing blocks or capstans and is recognized as the world leader in this field. The cutting edge HVOF, plasma, metallizing and submerged arc coating technologies are used to improve the wear and corrosion resistance of many process parts. Tuner rolls, sheaves, step cones and various guide devices are prime candidates for hard coating to minimize the down time associated with frequent change out.

In the 1950's Parkway-Kew Corp. pioneered the use of submerged arc welding for the rebuilding and hardsurfacing of wire drawing blocks. Submerged arc welding is still considered the premier method and most cost effective method for hardsurfacing wire drawing blocks. PK-503 with its characteristic cracked appearance caused by heat checking of the super hard alloy. In some cases, the cracked surface may be detrimental to the quality of the wire. In these instances, PK-200 which is a sub arc alloy of the same hardness, but lesser chemistry is used on steel sleeves or steel blocks because it will deposit virtually crack free.

Later, Parkway-Kew Corp. introduced the use of fuse welding for wire drawing rings used to draw copper and aluminum. PK-920, PK-700, and PK-800 are the industry standards in this field. They offer a viable lower cost alternative to solid ceramics without the potential breakage or slippage problems inherent in solid ceramics.

In the early 80's, Parkway-Kew Corp. added the metallizing capability at the request of some of its customers. The primary alloys used with this method of hardsurfacing are PK-400 and PK-475. Both alloys are very forgiving and provide the highest quality surface finish to the wire being drawn. These alloys are not the most wear-resistant alloys, but can be the most practical and in the case of very large wire, they are the only successful type of hardsurfacing.

In 1989, Parkway-Kew Corp. introduced the first HVOF (high velocity oxygen fuel) coating for a wire drawing block. HVOF is a hardsurfacing process where the alloy powder is expelled from a spray gun at speeds that can exceed Mach 6 and the powder impinges on the substrate and then builds up on itself. It forms a hard dense coating, which is imperfection free that then can be ground to specifications. A wide variety of alloys can be applied with the HVOF system; the two primary alloys for wire drawing blocks are PK-700 and PK-920. PK-700 is a tungsten carbide alloy and PK-920 is a nickel, chrome, and boron alloy.

In the late 90's, Parkway-Kew Corp. introduced the plasma sprayed ceramic coated block. This method has proven very cost effective for high speed and high slip, ferrous wire drawing applications, especially for small high quality or plated wires. PK-1500 is the most wear resistant ceramic utilized for wire drawing blocks.
Vaughn Capstan Hardsurfaced with PK-503 Direct to Cast Iron with Submerged Arc
14" Vaughn intermediate block hardsurfaced with PK-503
Capstan salvaged by equipping with a PK-503 hardurfaced steel sleeve
22" Macbee stripper block hardsurfaced with PK-503
Wire Drawing Sheaves
Blocks
Regrinding
Tuner and Guide Rolls
Restore and Grind
Block Maintenance
Step Cones
Grit Blasting and Aluminizing
High Wear Green Plastic
Multi Groove Sheaves
Urethane Coated Grippers
Urethane Coated Tensioning Wheel
Wire Drawing Sheaves
Rings and Capstans
Packaging
Guide Rolls
Annealer Contact Rolls
Step Cones
Solid Ceramic Step Cones
Air Wipe
High Wear Green Plastic
Multi Groove Sheaves
Urethane Coated Grippers
Urethane Coated Tensioning Wheel

 



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