Use and maintenance of coupling on planer

　　There are many diaphragm couplings currently in use, and there are many types of couplings on the market.So, what is the purpose and installation of the diaphragm coupling? Now let us introduce it in detail.

　　Use and installation of diaphragm

　　The diaphragm coupling is driven by an elastic element and a metal diaphragm to transmit torque.Because the bolts, diaphragms and half couplings rub against each other, it is necessary to quench and temper the coupling to ensure the use of the coupling.The quenching and tempering treatment of the coupling needs to harden the entire part of the workpiece, so that the workpiece is obtained by finely stacked quenched martensite.By tempering at high temperature, a microstructure mainly composed of uniform tempered sorbite is obtained.It is impossible for small factories to conduct metallographic analysis of every furnace.Usually, it is only used for hardness testing.In other words, the hardness after quenching must reach the quenching hardness of the material, and the hardness after tempering should be checked according to the requirements of the drawings.

　　(1) Considering loads such as bolt pre-tightening force, torque, centrifugal force, etc., a calculation model of the diaphragm coupling is established.Through contact finite element analysis, the influence of installation error on the mechanical properties of the diaphragm coupling is studied.

　　(2) The equivalent stress value of each diaphragm is quite different. The stress of the two diaphragms and the middle diaphragm decrease in order, and the distribution is uniform.Centrifugal force has a significant effect on the stress of the diaphragm.

　　(3) Axial deviation, radial deviation and angular deviation have a greater impact on the comprehensive displacement and equivalent stress of the diaphragm group. Among them, the angle error should be strictly controlled during the installation process.

　　How to buy a diaphragm:

　　1. The diaphragm coupling consists of at least one diaphragm and two bushings.The diaphragm is fixed on the bushing and usually does not loosen or cause a gap between the diaphragm and the bushing.Some manufacturers provide two diaphragms, but there are also three diaphragms with one or two rigid elements in between, and the two sides are connected to the sleeve.

　　2.Diaphragm couplings are a bit like bellows couplings.In fact, the way the coupling transmits torque is almost the same.The diaphragm itself is very thin, easy to bend under the action of relative displacement load, can withstand up to 1.5 degrees of deviation, and produce lower bearing load in the servo system.

　　Diaphragm coupling is often used in servo systems.The diaphragm has good torque stiffness, but it is slightly lower than the bellows.

　　4. Choosing the right coupling is the key to rational use of the coupling.In the design stage, we must consider which type of coupling to choose.

　　On the other hand, the diaphragm is very fragile and can be easily damaged if it is not installed correctly or in use.Therefore, it is very necessary to ensure the deviation of the bearing range in the normal operation of the coupling.

　　6. Rated torque (Nm).

　　Inspection and Repair of Planer Coupling

　　Use external gear coupling for mapping and processing.The inner hole size of the external gear coupling should be determined according to the shaft diameter d and the excess amount of the heat sleeve.The main drive shaft and the main reduction mechanism of the planer are generally coupled by internal and external teeth.The connection between the main drive shaft and the external gear coupling usually adopts a spline or a symmetrical flat key connection.Because the shaft diameter here is small, the connection strength is low, and it often fails after long-term use or overload, which affects normal production.The simple repair method is to replace the main drive shaft and the external gear coupling, but it requires tens of thousands of dollars.In order to save money, our company has been using repair methods, and has achieved obvious results.Use external gear coupling for mapping and processing.The inner hole size of the external gear coupling should be determined according to the shaft diameter d and the excess amount of the heat sleeve.According to the large torque to be transmitted and the shaft diameter size, the excess u can be calculated from the following formula.In the formula: 2mk-large transmission torque, f-static friction coefficient of n·mm is between the contact surfaces of the parts, generally 0.15d-nominal diameter surface, mm z-matching length, mm e1, e2- are respectively The elastic modulus of the sealing material and the wrapping material, mpa calculates the temperature of the heat jacket.The temperature t required by the heating jacket is calculated according to the following formula.In the formula t=k(u+δ)/(βd)(3): t-heat temperature of the copy of the package, °ck-considering the heat loss coefficient from the heater to the assembly completion time, summer k=1.1 To 1.2, winter k=1.15 to 1.5u-the actual excess millimeter δ at room temperature-the small gap required for free assembly.Mm β linear expansion coefficient d-nominal diameter of the fitting surface of the part.It can be seen from formula (3) that the larger the diameter d, the lower the heating temperature required.The external gear is coupled and heated to the calculated temperature d, and then installed on the main drive shaft and cooled to room temperature naturally, so that the main drive shaft and the external gear are coupled as a whole.On a planer with a flat key connection between the main drive shaft and the external gear coupling, the failure of flat key or key groove broken and flat key fracture often occurs.At this time, as long as the key is replaced, the deformation of the key groove on the main drive shaft after welding can be repaired by rotating the key groove by 90°.However, at the coupling between the main drive shaft and the external gear, the following methods are often used to repair the serious failure of the main drive shaft.

　　The above is the content of the diaphragm coupling. If interested partners want to learn more about related shaft couplings, please pay attention to our official website!