Bonding Of Pintle Sleeves
Common Defects
Problems experienced during traditional shrink fit methods. Bi Metallic corrosion causing vibration and wear.
Preparation
All work should be carried out in strict accordance with the relevant ThistleBond Technical Data Sheet.
Large shafts or sleeves should be pre heated to ensure a substrate temperature minimum of 10°C (50°F), in order that the product will flow evenly through the annular space between the components. There may be, therefore a requirement for space heating equipment. Pre fabricate a suitable sleeve ensuring an inner diameter of ½” – 1/6”
Larger than the pintle diameter. Then pre drill the sleeve and tap at a minimum of three locations around the circumference at each end, to allow ¼” in diameter and spaced at no more than 24” centres equidistant around the circumference of the sleeve.
Surface Preparation
a). Wash all surfaces to be treated with UPS TAC 883 Universal Cleaner in order to remove all dirt and grease. Grit Blast all surface to be treated using an angular abrasive to give a surface finish of Swedish Std Sa2½ ensuring a profile of 75 microns minimum.
b). Alternatively, machine the outer surface of the pintle and the inner surface of the sleeve to produce a rough thread profile. On completion of all preparation and before the application of the product wash down all surfaces with UPS TAC 883 Universal Cleaner.
Application Technique
Place the sleeve on the pintle and use the jacking screw, pre coated with UPS TAC 872 Release Agent to prevent bonding, to correctly locate and centralise the assembly.
Mix appropriate amount of UPS 19065 RG Rapid Grade Metal Repair Paste (TR19065) and apply a fillet of this material to seal the annular gap at each end of the sleeve. As soon as this sealing material is dimensionally stable, mix the UPS 205 FG Fluid Grade Ceramic (TR205) product and load it into the disposable injection cartridges. Using suitable pneumatic Equipment, immediately inject the material starting from the lowest point and working towards the highest in order to ensure that the annular space is completely filled.
As general rule, material should be injected at one point until material appears at the surrounding ports. The first port should then be sealed with a suitable bung and injection recommenced at one of the surrounding ports. This process is then continued until all voids are filled and material is seen to exude from the highest ports.
Following the relevant cure time, remove all jacking screws and mix a suitable grade of UPS 105 EG Metal Repair Paste (TR105) and fill the jacking screws. If necessary the sleeve can now be machined to final dimensions.
Recommended Equipment
Mixing and application tools are included in each pack of ThistleBond Product. Prior to carrying out the repair however, it is important that all necessary tools and equipment are available on site.
These could include the following – Grit Blasting equipment, UPS TAC 883 Universal Cleaner, UPS TAC 872 Release Agent, Protective Clothing, Polyethylene Tenting, Suitable centralising Jig or Template. New Pintle.
