Item Description
Substantial rigidity, sealed, standard use.
Push mode: ball screw 20mm + 15mm double rails.
Repetitive positioning precision quality C ±0.02mm & precision grade P ±0.008mm
Horizontal load: 60kg.
Motor mounting style: immediate and indirect optional.
Specifying a Ball Screw
When you require a high-good quality ball screw, it is important to select a single with the proper proportions and specifications. When you are searching for the ideal item, you must take into account attributes this sort of as preloading, area complete, and inner return method. You can discover far more about these functions in this post. If you might be doubtful which kind of ball screw to select, speak to a reputable provider for further direction. To uncover the best product for your needs, click listed here!
Brinelling
When specifying a Brinelling ball screw, it is critical to know how considerably axial load it can properly bear. The static load capability, which is offered 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 pose a issue. For far more information, speak to a CZPT engineer. Brinelling ball screw support life calculation need to be done employing the pursuing knowledge:
Preload: The amount of load a ball screw can take care of in the course of a solitary revolution. Preload is the load applied prior to the ball screw starts relocating, and the load is typically between five and 10 % of the dynamic capability. However, a ball screw that is subject to vibration will experience larger preload, requiring far more frequent lubrication. The ensuing mechanical tension may possibly lead to the ball screw to buckle, or lead to the nut to re-circulate the balls.
Crucial ball speed: The greatest velocity at which the ball can transfer through the ball nut is called the essential ball velocity. In contrast, running the ball screw at its crucial shaft pace can guide to abnormal vibrations, top to premature failure of the finish assistance bearings and brinelling of the ball track. Hence, it is advised to operate a ball screw at a decrease pace than the vital ball pace to avoid brinelling and plastic deformation of the balls.
False brinelling: Fake brinelling is a sort of Fretting. Bogus brinelling takes place when the bearings are not rotating. The movement will consequence in depressions or dress in marks in the bearing raceway. This will cause sounds, dress in, and eventual exhaustion. If these problems persist, a newer ball screw need to be used to check the program. The machine ought to be operate for several hrs and examined just before replacing the bearing.
Preloading
The process of preloading ball screws minimizes backlash by making use of stress to the threads in the opposite route of the screw's route of rotation. It prevents any movement of the screw relative to the nut. Different approaches are employed for preloading. A widespread one is to use oversized balls inside the ball nut. A double nut method might also be utilized. Both strategies are similarly efficient. Regardless of the strategy utilized, the end outcome is the very same - small backlash and elevated effectiveness.
In the traditional technique of preloading ball screws, the motors work simultaneously in opposite directions, leading to them to have a relative motion of about equal magnitudes. This reduces the frictional resistance of the system, resulting in fast traverse. The method is able to function with small backlash in the course of one hundred ten inches of vacation, reducing the heat developed by the travel nuts and the issues connected with ball screw heating. Moreover, this approach can be used in a extensive selection of purposes.
One more method of preloading ball screws is identified as the ball-decide on approach. This strategy includes the use of more than-sized balls that power the balls into a lot more contacts with the screw and nut than a standard ball screw. The benefit of this strategy is that it minimizes backlash due to the fact the balls are not machined to substantial tolerances. The drawback of this strategy is that the ball screw will value more to manufacture than a normal ball screw and nut.
A traditional design includes a mechanical mechanism that uses a series of balls to rotate a shaft. The difficulty of backlash is exacerbated by the mass of the shaft. The mechanical technique is much more intricate than required and frequently demands a good deal of work. The existing creation gets rid of these difficulties by offering an enhanced method and equipment for driving ball screws. This technique provides a more efficient preload power that is dynamically adjustable while the mechanism is running. The strategy can also boost friction and wear.
Interior return system
There are two diverse kinds of ball screws. The first sort is external and the second is interior. The exterior kind makes use of return tubes that protrude from the ball nut and increase above and around the outdoors of the screw. The inside variety makes use of a solitary tube that spans the ball observe, whilst the more common layout employs several tubes spanning 1.5 to 3.5 ball tracks. The inside technique requires a one return tube and several pickup fingers that guide the balls into the tubes.
The external return tube design and style is an simpler, less pricey option. The external ball return method has constrained area but can take care of a broad range of shaft diameters and sales opportunities. Nevertheless, its bodily dimension can make it incompatible with several substantial-velocity purposes. For that reason, watchful thing to consider should be provided to the mounting choices. Interior ball return methods are best suited for tiny qualified prospects and ball dimensions. These that want a higher velocity will most likely advantage from the external ball return method.
Inner ball screw engineering has also retained tempo with the needs of linear drive methods. Ball screw engineering is now more tough than at any time. Sturdy inside ball return methods circulate ball bearings through a sound pickup pin. These deflectors help the balls return to the screw in the proper place. They are vital elements in personal computer-controlled motion control programs and wire bonding. If you are intrigued in the latest developments in linear screw technologies, make contact with us right now.
Ball screws are superior to lead screws in numerous approaches. Ball screws are much more effective than direct screws, changing 90% of rotational motion into linear movement. As a consequence, they are more high-priced than direct screws and acme screws. They also provide a smoother motion above the total travel variety. Furthermore, they require much less electricity for the same overall performance. It truly is no question that the ball screw is so common in numerous distinct purposes.
Surface area complete
The surface area end of a ball screw is 1 of the important elements in identifying the overall performance of the system. A ball screw with a very good surface area finish has outstanding performance in rolling resistance, backlash, and use characteristics. However, it is critical to increase the surface complete of a ball screw to obtain precision movement, low wear, and reduced noise. To obtain this, particular wire brushes will be utilized to polish precision-floor shafts.
For a ball screw to perform well, it must be hard, have a clean area, and retain lubricant. The surface complete of a ball screw need to be smooth, totally free of cracks, and retain the lubricant effectively. Cracks and annealing are the two unwanted for the duration of the manufacturing method, so a top quality machine need to be utilised for its floor end. During the manufacturing approach, a CBN chopping insert with entire spherical or gothic arch profile can be utilized to obtain a high-high quality surface area end.
An additional finishing procedure utilised in the manufacture of ball screws is lapping. Lapping improves surface area high quality and vacation variation. It entails complicated relative actions of abrasive particulates with the workpiece. This eliminates a slim layer of materials from the workpiece, bettering its surface area good quality and dimensional accuracy. The lapping procedure can be carried out under low-stress situations. It also boosts the friction torque and lubrication.
In lapping experiments, friction torque has the largest influence on travel variation and surface roughness. A friction torque of about one N x m is the best possible. In addition, rotational speed has only a minimal impact. The very best combination of these parameters is 1-1.5 N x m and 30 rpm. The bare minimum floor end of a ball screw is about 800 mesh. The smallest variation in journey is observed at about 50 %-way by way of the journey.
Lubrication
Suitable lubrication of ball screw assemblies is vital to sustain optimum efficiency and lifestyle. Ball screw assemblies should be lubricated with grease, which is launched immediately into the ball nut. The lubrication port can be located at a variety of areas on the solution, including on the flange or in the exterior threads of the ball nut. Some ball nuts also feature a zerk fitting for simpler lubrication.
The lubrication of ball screws is essential in the scenario of running circumstances above 100oC. The minimal load for a ball screw is typically realized with a preload force. The lubricant is conveyed by means of the narrow lubrication hole thanks to the relative movement of the two surfaces. The improved viscosity of the lubricant enables separation of the make contact with surfaces. To keep away from above-lubrication, it is essential to check the lubricant amount regularly.
The oil employed in lubrication of ball screw assemblies can be both mineral or synthetic. 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 extensively employed classification for lubricating greases. It is not ample to pick a specific kind of lubricant for a particular software, but it provides a qualitative measure.
In spite of currently being essential to the functionality of a ball screw, lubrication is also essential to its lifespan. Distinct types of lubricant provide corrosion security. Just before making use of a lubricant, make sure to completely clean and dry the ball screw. If there is any buildup of dust, it could harm the screw. To stop this from taking place, you can use a solvent or lint-totally free cloth. Lubrication of ball screw assemblies can significantly increase the existence of the assembly.
