Monaghan Tooling Group introduces their Mechanical Joining Tools which join tubing to flanges and fittings, creating secure, leak-proof joints that withstand up to 20,000 lb of hydrostatic pressure. Superior to welded, brazed or crimped joints, mechanically joined parts will not leak, pull apart, or loosen due to pressure, vibration, or temperature changes. This proven method allows joints to be rolled to a torque or diameter spec.
Rolling to a torque ensures consistent results, regardless of tolerance and variations of the tube OD, wall thickness and component ID. Rolling to a consistent diameter guarantees a consistent ID of the tube, which makes it possible to “iron out” and round up the ID of the tube. Virtually any annealed or ductile product can be mechanically joined, including mild steel, stainless steel, aluminum, titanium, copper, cupronickel, Inconel and more. Monaghan Mechanical Joining Tool (MJT) is suitable for applications where joints loosen due to changes in temperature, altitude changes, vibration, and where high pressure is present, including those common in the automotive, fluid power, and the aerospace industries.
How it works
A tube is inserted into the flange, then a mechanical joining tool is inserted into the tube. A generous chamfer or radius should be provided on the backside of the flange. The opposing end should include a shoulder that the tube can bottom out against to ensure proper position. Flange grooves with sharp corners at the top edge and the bottom of the groove are required. The width of the groove can be 0.062 to 0.375-in. (1.6 to 9.5mm), with depths from 0.005 to 0.0320-in. (0.13 to 0.81 mm) — both dimensions are dependent on flange width, thickness, and hardness of tube.
When the tube has been rolled to about 25% of total MJT expansion required, it makes metal-to-metal contact with the flange.
At approximately 50% MJT expansion, the tube metal begins to flow into the grooved serrations of the flange.
When the Mechanical Joining Tool is completely expanded, grooved serrations are now filled to the predetermined groove fill percentage of the tool. (Groove fill percentages vary by industry as well as applications.) Once the correct joint has been completed, the rotation of the tool is reversed so that it can be extracted from the assembly and the cycle can be repeated with new components.
Monaghan MJT is suitable for a variety of applications including hydraulic fittings, fitting and block assemblies for hydraulic components, hydraulic lines, tube installation into transmissions, differentials on large equipment, and all types of fluid lines in aircraft. Monaghan engineers are available to assist with tooling selection and other aspects of the mechanical joining process.
Monaghan Tooling Group provides engineered tooling and services, including application-related consulting, to solve machining challenges. They have partnered with standard and custom tooling manufacturers including Elliott Tool Technologies, Diatool, UC Tools, RE-AL, MK-Tools, Reamtec, and Axis to address the challenges of precision metal finishing and high-performance cutting.
Monaghan Tooling Group