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Disc brake, Multi-disc brake, Brake, Clutch, Rotary union
Text version of the page
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| Airflex Drum and Disc Materials | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Drum and Disc Materials Gray iron is used as an interface in the majority of Airflex clutch and brake applications. Other materials used for structural or thermal reasons include ductile iron, carbon steel and copper alloys. For applications where little or no thermal energy is generated due to slippage, material selection is based upon their mechanical properties and cost. Cast gray iron castings are inexpensive and patterns are available for all standard drums and disks. Castings of ductile iron provides additional strength and ductility that may be needed in high speed applications and those that must endure shock or impact loads. Plain carbon steel fabrications can provide the additional strength and ductility without the need for a casting pattern. Fabrications may offer a price advantage when only one or two parts are involved and may be more readily obtainable than cast parts. The use of copper alloys is generally limited to applica- | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ductile iron has a lower thermal conductivity and higher modulus of elasticity. This results in higher surface temperatures, lining fade and accelerated wear under extreme conditions. Surface stresses are higher and prone to heat checking. Carbon steel has a thermal conductivity similar to that of gray iron and a modulus of elasticity similar to ductile iron. Therefore, it will yield low surface temperature, but will be somewhat prone to heat checking. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| tions requiring high thermal conductivity and where high first cost is not prohibitive. In applications where a significant amount of heat is generated, the thermal properties of the materials are more significant. Their pertinent properties are shown in the table, below. Copper alloys have thermal properties which are best exploited by using forced-convection - usually, water cooling; however, special non-aggressive friction material is required to provide an acceptable wear rate of the alloy. The thermal conductivity of gray iron combined with its low modulus of elasticity results in lower temperature and stresses at its sliding surface. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Copyright Eaton Corporation, 1995, All rights reserved. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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