For the conversion of rotary into longitudinal movements or vice versa supplies Misumi different versions of Ball screws. They consist of a threaded spindle, a ball screw nut in which the balls are integrated, as well as the ball return. This is available in application-specific variants.
Ball screws are the most commonly used threaded spindles in industrial and precision machines. The components used as drive and feed elements are characterized by low-friction and precise running. With high accuracy the mechanical efficiency is up to 98% compared to a maximum of 48% for the trapezoidal screw drive, the inverse efficiency when converting a longitudinal movement into a rotational movement up to 85%. Ball screws also require a low drive torque. The low-wear rolling friction of the spherical rolling elements results in a long service life, low self-heating and low lubricant requirement. Even the often unwanted stick-slip effect in technical applications can be ruled out due to the low static and dynamic friction coefficients.
The Schwalbacher supply ball screws with rolled and ground spindles with various thread diameters and pitches for various feed, positioning and transport tasks as well as connection and ambient components such as fixed and floating bearings, spacer rings and plates for floating bearings and bearing blocks, supports and stops for ball screws. Rolled ball screws with the precision classes C10 and C7 are a cheaper option; On the other hand, ground surfaces enable a higher degree of precision - versions in the C7, C5 and C3 classes are available here. The provider offers the application-specific shaft end version with the "Configurable components" feature. Whether offset, offset ring groove / tapped hole / wrench flats, single or double-sided - Users can choose from a wide range of freely combinable shapes, which can be adapted to the respective application exactly to measure. In the main catalog, users will find special options for shaft end design with corresponding detail drawings for the individual components.
For applications requiring special corrosion protection, certain spindle types are available with Low Temperature Black Chrome Plating. The LTBC coating technology, with layer thicknesses in the μm range, which are applied after machining the shaft, the component geometries remain unchanged and the original properties of the material are completely preserved. LTBC-coated components are characterized by an optimized relation between hardness and elasticity; they are crack-resistant on the surface and highly resistant to bending. The layer is permanently connected to the surface by a diffusion process. Optimized anti-rust properties are guaranteed over 10 years.
A question of leadership style
Ball screw nut systems enable linear motion along the spindle with rolling elements running in the thread profile of the shaft. For this purpose, the nut bodies are equipped with incorporated ball recirculation and recirculation. They are classified according to the ball deflection with different advantages in terms of design and performance in different types:
- With a return sleeve fixed on the outside of the nut housing or a return tube method made of steel, the most frequently used, relatively economical variant. Also due to the simple assembly, it is suitable for use in mass production or mass production. The tube forms together with the ball channel between the nut and spindle a closed circuit for the rolling balls.
- The version with guide piece (guide plate method) is the slightly more compact version. The guide plate performs a similar function as the deflection tube, this type of ball return but allows some small dimensions of the nut.
- The deflector type (flop-over method) with two shorter rows of balls is the most compact type of nut. Here, the balls roll over the groove of the spindle and are returned via a deflector deflection integrated in the master cylinder.
- The End Cap Redirector is most common for high pitch, high speed, high speed nuts in higher speed applications. Through the groove of the spindle, the balls roll off until they are returned through holes in the end caps in their original position and the track groove again fed.
The current main catalog is valid until the end of 2010.