MK2-5-25-5-8 coupling Germany R+W model MK2-5-25-5-8 price

MK2-5-25-5-8 coupling is a torsionally rigid coupling with zero backlash even under load. Even when misalignment generates load, the rigid coupling transmits torque rigidly. Lightweight, ultra-low inertia and high sensitivity. Maintenance-free, excellent oil resistance and corrosion resistance. Aluminum alloy and stainless steel materials. Set screw type, clamping type and split type are available. Models with different bore sizes at both ends are also in stock.

MK2-5-25-5-8 coupling introduction

If there is any misalignment in the system, it will lead to premature damage of the shaft, bearing or coupling, which means it cannot be used in high-speed environments because it cannot compensate for the relative displacement between shafts caused by high temperature generated during high-speed operation. Of course, if the relative displacement can be successfully controlled, rigid couplings can also perform excellently in servo system applications. Especially small-sized rigid couplings have the superior performance of light weight, ultra-low inertia and high sensitivity, and in practical applications, rigid couplings have the advantages of maintenance-free, strong oil resistance and corrosion resistance. Although people in the past did not approve of using rigid couplings in servo drives, due to their high torque capacity, rigidity and zero-backlash performance, small-sized aluminum alloy rigid couplings are increasingly used in motion control fields.

MK2-5-25-5-8 coupling classification

Rigid couplings are divided into flange couplings, radial key flange couplings, sleeve couplings, clamp shell couplings and parallel shaft couplings. Flange coupling: A coupling that connects two half-coupling flanges with bolts to achieve shaft connection. Radial key flange coupling: A coupling that connects two half-couplings with radial keys and ordinary bolts. Sleeve coupling: A coupling that connects two shafts in some way using a common sleeve. Clamp shell coupling: A coupling that achieves shaft connection by clamping two axially split clamp shells in some way. Parallel shaft coupling: A coupling that achieves connection of two parallel shafts through pin shafts using an intermediate disc.

MK2-5-25-5-8 coupling mechanical properties

The heating temperature for rigid couplings is usually 560~600℃, and the hardness requirement is HRC22~34. Since the purpose of quenching and tempering is to obtain comprehensive mechanical properties, the hardness range is relatively wide. However, if the drawing has hardness requirements, the tempering temperature must be adjusted according to the drawing requirements to ensure hardness. For example, some shaft parts require high strength, so the hardness requirement is high; while some gears and shaft parts with keyways require lower hardness because milling and broaching processes are performed after quenching and tempering. Regarding the tempering holding time, it depends on the hardness requirement and workpiece size. We believe that the hardness after tempering depends on the tempering temperature and has little relationship with the tempering time, but it must be thoroughly tempered. Generally, the tempering holding time for workpieces is more than one hour. Cr can increase the hardenability of rigid couplings, improve the strength and tempering stability of steel, and has excellent mechanical properties. For large cross-section or important quenched and tempered workpieces, Cr steel should be used. However, Cr steel has the second type of temper brittleness. From the perspective of foreign development trends, new generations of CNC machine tools are developing towards ultra-high speed to improve production efficiency, using new functional components (electric spindles, linear motors, etc.) to achieve ultra-high speed machining. The electric spindles and linear motors required for rigid couplings directly connect the motor and the main shaft through expansion tightening coupling sleeves, eliminating intermediate mechanisms such as gearboxes to achieve ultra-high speed. A CNC machine tool requires at least five or six sets of couplings, and up to fifty or sixty sets. It can be seen that this is a huge market. The German R+W rigid coupling industry is becoming increasingly popular. Coupled with factors such as corporate management, we will analyze what trend the coupling industry will present in the near future.

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