Plasti-Quip

Contact: Sales Manager

Unknown
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U.S.

Phone: 800-626-4180
Fax: 800-820-3872

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Screws Repair and Rebuilding The amount of screw and/or barrel wear that is tolerable varies widely depending on material being processed, color, type of part, degree of part quality required, and other factors. What is acceptable to one molder, or even to one machine, may not be acceptable to another and visa versa. The following chart is merely a guide to assist you in determining the appropriate time to purchase a new screw, rework the old one and/or consider barrel re-lining. STANDARD REBUILD Rebuild Flites and Rear Bearing - Grind Flite O.D. undersize; Build-Up with Base Material, Colmonoy or Stellite; Grind and Polish. Repair Washed-Out Roots - Grind Root Area undersize; Build-Up with Weld; Grind and Polish Straighten Screw - Check Screw for Straightness; Straighten when necessary Repair Check Ring Thread & Seat Area - Remove broken Check Ring; Repair Thread when necessary; Grind Check Ring Seat Area to ensure proper seating Clean and Polish - Entire Screw. Looks and works like New! OTHER REPAIR SERVICES AVAILABLE Nitriding - Nitride to Depth of 0.015" for added Wear Resistance Chrome Plating - 0.003" to 0.005" thickness. Strip Old Chrome if present Cracked or Broken Screws - Can usually be repaired, whether entire Screw is broken or just a section Change Compression Ratio - Change Compression Ratio to your requirement Many Other - Repairs and/or Modifications also available New Injection Screws 4140 Flame Hardened - Basic General Purpose Screw hardened to 48-55 R/C. For non-demanding applications. Often faced with Stellite #6 or Stellite #12 for better Wear Resistance in non-corrosive environments; with Colmonoy #56 or Colmonoy #83 for even better Wear Resistance and some Corrosion Resistance. Chrome Plating will improve Material Flow characteristics and provide some protection against Corrosion. 135M Nitralloy - A Cost Effective alternative for Moderately Abrasive Filled Resins with Low Glass Content or Soft Fillers. Nitriding provides 63-70 R/C Hardness CPM9V or CPM10V - Excellent where High Abrasion Resistance is needed. For applications where Flites are subjected to highly Abrasive Materials or Fills. Generally not cost effective for Screws over 50mm or 2” diameter. Not rebuildable. D2 and Others - D2 (at 58-60 R/C), PH hardened Stainless Steel, Nickel-Chrome Alloys and other materials available depending on your particular needs. BASE MATERIAL WEAR CHARACTERISTICS Material Hard Facing  Treatment Hardness Abrasion Resistance Corrosion Resistance 4140   Flame Hardened 48-55 R/C Modest Poor 4140 Chrome Plated   60-65 R/C Good Modest 4140 Colmonoy   48-55 R/C Good Modest 135-M Nitralloy Nitrided 63-70 R/C Good Poor CPM9v or CPM10V Heat Treated 54-56 R/C Excellent Poor D-2 Tool Steel Heat Treated 58-60 R/C Good Modest 17-4 PH Stainless Steel Precipitation Hardened 41-43 R/C Modest Goo HARD FACING Stellite #6 or #12 Hard Facing - For General Purpose Non-Filled Resins. A traditional Cobalt-Chrome Alloy added to Flite Surfaces. Increases wear resistance. Not as durable as Colmonoy Colmonoy #56 or #83 Hard Facing - Also for General Purpose Non-Filled Resins. Nickel Based material added to Flite Surfaces. Increases both Wear and Corrosion Resistance. Good compatibility with Bimetallic and Tungsten Carbide Composite Barrels. And Others - Such as Tungsten Carbide Composite Hard Facings for greater Wear and Corrosion Resistance, or Nickel Alloy with virtually no Iron Content for use in extremely Corrosive Situations SURFACE TREATMENT Chrome Plating - 0.003"-0.005" Thickness provides moderate protection when molding Unfilled Resins. Material flows more smoothly, particularly in Root Area Nitriding - Provides 60+ R/C Surface Hardness (very hard). A good choice for moderately abrasive Filled Resins  Barrel Relining and Repair NOTE: Re-Lining includes Boring, Sleeving, Honing and Polishing Barrel. Ready to be put back into service. This can be done for Sleeve Lengths 3-4 times the Screw Diameter (ie: a 2" diameter Screw would have a 6"-8" long Sleeve). This is generally the "Wear Length" and is suitable for many Re-Sleeving jobs. Full length liners are also available, but often cost up to 65% as much as a new barrel. Your Barrel will be inspected upon receipt and recommendations made. D-2 (Not Nitrided) A Through Hardened High Chrome Content Tool Steel with Moderate Abrasion Resistance when molding Glass or Mineral Filled materials. Mild Corrosion Resistant properties also. D-2 (Nitrided) Most popular. Same as D-2 above but with extremely Hard Surface to depth of 0.015". Improves Wear Resistance over Non-Nitrided D-2 CPM10V Very High Wear Resistance. For continuous molding of Glass, Ceramic, Mineral or Metal Filled Resins. High Vanadium Content CPM-T440V Where Corrosion is a problem. High Chrome and Vanadium content Stainless Steel with high Wear Resistance for such resins as Glass Filled PVC Bimetallic Many types available. Call for further data and prices Barrel End Caps Barrel End Caps are available of Heat Treated 4140, Nitrided Nitralloy 135M, Wear Resistant D-2 Steel, 17-4PH Stainless Steel and other materials depending on customer needs. Optional surface treatments include Chrome Plating, Armalloy, Tin and others. When Relining or Repairing your Barrel it often is wise to consider replacing the End Cap. Prices are not listed here due to the wide range of makes, models and materials. Call 800-626-4180 for pricing. Since End Cap dimensions often vary widely, even for the same make and model machine, we suggest that when ordering or requesting a quote you fill in dimensions or send a sample.