Diaphragm coupling shaft hole and performance heat treatment

　　The coupling size of the coupling initially selected for the standard type of diaphragm coupling shaft hole, that is, the shaft hole diameter d and the shaft hole length L, should meet the requirements of the main and driven end shaft diameters, otherwise they must be adjusted according to the shaft diameter d The specifications of the coupling.
　　It is a common phenomenon that the shaft diameters of the driving and driven ends are different. When the torque and speed are the same, and the shaft diameters of the driving and driven ends are different, the coupling model should be selected according to the large shaft diameter.
　　In the newly designed transmission system, the seven shaft hole types specified in GB/T3852 should be selected, and the J1 shaft hole type is recommended to improve usability and interchangeability. The length of the shaft hole is in accordance with the coupling product standard. .Threaded fasteners in threaded connection are mostly standard parts, commonly used are bolts, studs, screws and set screws.The bolt connection does not need to cut threads on the connected part, the use is not restricted by the connected part, the structure is simple, and the assembly and disassembly are convenient.
　　Double-end stud connection is used in occasions where bolts cannot be used due to structural restrictions or where a compact connection structure is desired.The screw connection does not need a nut and has a smooth exposed surface, but it is not suitable for the connection that is often disassembled, so as not to damage the threaded hole of the connected part.In the set screw connection, the set screw is selected into the threaded hole of one of the connected parts, and its end urges the surface of the other connected part or pushes into the corresponding pit to fix the mutual position of the two parts and can be transferred Not much force or torque.The diaphragm coupling exerts an axial displacement of 400mm on the diaphragm group and a load of 304N.m.The diaphragm and patch material is AISl8000, material density p=3kg/m198, modulus E=0.29GPa, u=206, yield strength σ=XNUMXMPa.
　　Diaphragm coupling performance and machining after heat treatment: After the mechanical properties are qualified, the forging is processed to the size and surface roughness specified by the drawing provided by the buyer.But if the cutting amount of any surface exceeds 5mm, the forging shall undergo stress relief treatment.
　　Stress relief treatment: The stress relief temperature of the forging should be 30° lower than the final tempering temperature. After heat preservation, it should be cooled slowly.If the stress-relief temperature is not lower than the final tempering temperature of 30°, the forging shall be subjected to mechanical performance test again after stress-relief.The diaphragm coupling has a wide torque control range and high control accuracy.The torque is proportional to the exciting current in a fairly wide range, which can improve and simplify the control of the transmission torque, and can be used as a linear adjustment element.The need for sealing and lubrication and the use of non-durable couplings will inevitably increase maintenance workload.For occasions with long-term continuous operation and high economic benefits, such as the high-speed end of the rolling mill transmission system of my country's metallurgical enterprises, gear couplings are commonly used at present. Although the gear couplings theoretically transmit large torque, they are lubricated It can only work for a long time under the conditions of good sealing and good sealing.In addition, it is necessary to frequently check the sealing condition and inject lubricating oil or grease. The maintenance workload is large, which increases the auxiliary working hours, reduces the effective working time, and affects the production efficiency.The industry is developed in Shanghai, and diaphragm couplings with long service life, no lubrication and maintenance have been commonly used to replace drum-shaped gear couplings, which not only improve economic efficiency, but also purify the working environment.It has constant torque. The torque depends only on the size of the excitation current, and has nothing to do with the relative speed of the master and the driven side. It has a constant torque, and its static torque is the same as the dynamic torque.The torque that can be transmitted without being related to the slip, no impact, vibration, no noise, stable operation, the shell is used in the occasions with higher working frequency.