Item Description
Large rigidity, sealed, standard use.
Drive method: ball screw 16mm + 20mm solitary rail.
Repetitive positioning precision quality C ±0.02mm & precision grade P ±0.008mm
Horizontal load: 30kg.
Motor mounting type: immediate and indirect optional.
Specifying a Ball Screw
When you want a large-top quality ball screw, it is essential to pick 1 with the proper dimensions and technical specs. When you are hunting for the greatest solution, you must take into account characteristics these kinds of as preloading, surface area complete, and interior return program. You can discover more about these characteristics in this post. If you happen to be uncertain which type of ball screw to choose, get in touch with a reputable supplier for additional assistance. To uncover the very best item for your wants, click below!
Brinelling
When specifying a Brinelling ball screw, it is vital to know how much axial load it can safely and securely bear. The static load ability, which is provided in the catalogue, applies only to pure axial loading, and any radial load that is scaled-down than 5% of the axial load will not likely pose a dilemma. For much more info, speak to a CZPT engineer. Brinelling ball screw support daily life calculation ought to be done employing the adhering to knowledge:
Preload: The amount of load a ball screw can deal with throughout a single revolution. Preload is the load utilized just before the ball screw begins moving, and the load is normally amongst five and ten percent of the dynamic ability. However, a ball screw that is matter to vibration will experience higher preload, necessitating far more repeated lubrication. The resulting mechanical stress may possibly lead to the ball screw to buckle, or result in the nut to re-flow into the balls.
Essential ball speed: The maximum pace at which the ball can move through the ball nut is known as the crucial ball speed. In contrast, managing the ball screw at its critical shaft speed can guide to too much vibrations, major to untimely failure of the conclude assistance bearings and brinelling of the ball observe. Thus, it is suggested to run a ball screw at a lower speed than the crucial ball speed to stop brinelling and plastic deformation of the balls.
Bogus brinelling: Fake brinelling is a form of Fretting. False brinelling happens when the bearings are not rotating. The motion will result in depressions or wear marks in the bearing raceway. This will cause sounds, wear, and eventual fatigue. If these situations persist, a newer ball screw ought to be used to take a look at the method. The device must be run for many several hours and examined prior to replacing the bearing.
Preloading
The approach of preloading ball screws minimizes backlash by implementing stress to the threads in the opposite direction of the screw's path of rotation. It stops any movement of the screw relative to the nut. Various techniques are used for preloading. A common 1 is to use outsized balls within the ball nut. A double nut technique might also be employed. Each strategies are similarly successful. Irrespective of the method employed, the end outcome is the exact same - small backlash and improved effectiveness.
In the standard technique of preloading ball screws, the motors function at the same time in reverse instructions, triggering them to have a relative movement of roughly equal magnitudes. This lowers the frictional resistance of the system, resulting in quick traverse. The program is capable to work with small backlash during a hundred and ten inches of vacation, decreasing the warmth created by the push nuts and the issues associated with ball screw heating. Furthermore, this technique can be utilized in a wide range of apps.
One more method of preloading ball screws is identified as the ball-select method. This approach consists of the use of in excess of-sized balls that pressure the balls into far more contacts with the screw and nut than a typical ball screw. The edge of this approach is that it minimizes backlash due to the fact the balls are not machined to high tolerances. The downside of this strategy is that the ball screw will value a lot more to manufacture than a regular ball screw and nut.
A conventional layout involves a mechanical system that utilizes a collection of balls to rotate a shaft. The issue of backlash is exacerbated by the mass of the shaft. The mechanical technique is much more sophisticated than essential and often needs a whole lot of work. The current invention eradicates these troubles by providing an improved technique and equipment for driving ball screws. This technique gives a more efficient preload drive that is dynamically adjustable even though the system is functioning. The strategy can also enhance friction and dress in.
Inner return method
There are two distinct kinds of ball screws. The initial variety is exterior and the second is inside. The external kind makes use of return tubes that protrude from the ball nut and lengthen above and about the outside of the screw. The inside kind uses a solitary tube that spans the ball observe, although the far more common style uses multiple tubes spanning 1.5 to 3.5 ball tracks. The inner method entails a single return tube and several pickup fingers that guidebook the balls into the tubes.
The external return tube style is an easier, considerably less costly choice. The exterior ball return technique has minimal place but can deal with a broad selection of shaft diameters and prospects. Nevertheless, its actual physical dimensions can make it incompatible with a lot of substantial-pace programs. For that reason, careful consideration ought to be given to the mounting possibilities. Interior ball return methods are ideal suited for modest leads and ball sizes. Individuals that need to have a high speed will most likely benefit from the exterior ball return system.
Inner ball screw technologies has also held speed with the calls for of linear travel systems. Ball screw technology is now more durable than at any time. Robust internal ball return programs flow into ball bearings through a reliable pickup pin. These deflectors support the balls return to the screw in the correct area. They are crucial components in computer-managed motion manage techniques and wire bonding. If you might be fascinated in the most recent improvements in linear screw engineering, make contact with us these days.
Ball screws are exceptional to lead screws in numerous methods. Ball screws are far more efficient than lead screws, converting 90% of rotational motion into linear motion. As a end result, they are far more pricey than lead screws and acme screws. They also supply a smoother movement above the complete journey selection. Additionally, they need significantly less energy for the exact same performance. It truly is no question that the ball screw is so well-known in many different programs.
Surface area complete
The floor finish of a ball screw is a single of the key variables in deciding the functionality of the system. A ball screw with a excellent floor finish has outstanding performance in rolling resistance, backlash, and put on traits. Nonetheless, it is critical to improve the surface complete of a ball screw to attain precision movement, lower put on, and reduced sound. To obtain this, unique wire brushes will be utilized to polish precision-floor shafts.
For a ball screw to execute properly, it must be hard, have a smooth floor, and retain lubricant. The floor end of a ball screw must be easy, totally free of cracks, and keep the lubricant nicely. Cracks and annealing are both unwanted during the manufacturing procedure, so a quality device ought to be used for its area finish. For the duration of the generation method, a CBN chopping insert with total round or gothic arch profile can be utilised to attain a large-top quality floor complete.
Another ending operation utilized in the manufacture of ball screws is lapping. Lapping increases surface quality and travel variation. It requires sophisticated relative actions of abrasive particulates with the workpiece. This removes a skinny layer of content from the workpiece, enhancing its floor top quality and dimensional accuracy. The lapping approach can be carried out below reduced-stress problems. It also improves the friction torque and lubrication.
In lapping experiments, friction torque has the premier impact on journey variation and floor roughness. A friction torque of about a single N x m is ideal. In addition, rotational speed has only a minimal result. The best mix of these parameters is 1-1.5 N x m and 30 rpm. The least area finish of a ball screw is around 800 mesh. The smallest variation in vacation is noticed at about 50 percent-way through the travel.
Lubrication
Appropriate lubrication of ball screw assemblies is crucial to keep optimum performance and lifestyle. Ball screw assemblies ought to be lubricated with grease, which is released directly into the ball nut. The lubrication port can be found at a variety of locations on the product, which includes on the flange or in the external threads of the ball nut. Some ball nuts also feature a zerk fitting for less complicated lubrication.
The lubrication of ball screws is essential in the situation of working circumstances over 100oC. The minimum load for a ball screw is normally understood with a preload force. The lubricant is conveyed by way of the slim lubrication gap because of to the relative motion of the two surfaces. The increased viscosity of the lubricant permits separation of the get in touch with surfaces. To avoid over-lubrication, it is critical to check the lubricant level routinely.
The oil utilized in lubrication of ball screw assemblies can be either mineral or artificial. The oil is composed of mineral or artificial oil, additives, and a thickening agent, this sort of as lithium or bentonite. Other thickening brokers consist of lithium, barium complexes, or aluminum. The lubricant quality NLGI is a widely employed classification for lubricating greases. It is not adequate to pick a distinct type of lubricant for a particular application, but it gives a qualitative evaluate.
Despite currently being essential to the overall performance of a ball screw, lubrication is also essential to its lifespan. Different kinds of lubricant provide corrosion protection. Ahead of utilizing a lubricant, make confident to thoroughly clean and dry the ball screw. If there is any buildup of grime, it might harm the screw. To stop this from taking place, you can use a solvent or lint-free fabric. Lubrication of ball screw assemblies can greatly extend the daily life of the assembly.
