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By Michael Boudreau, P.Eng., Utility Engineering Supervisor, Rollvis SA
You might not be conversant in curler screws, however these compact, high-efficiency screw drives are an vital know-how within the manufacturing of on a regular basis units and merchandise. In truth, there have been most likely greater than 20 curler screws concerned within the manufacture and meeting of your automobile – performing capabilities comparable to punching, tube bending, and riveting.
However curler screws aren’t only for automotive purposes and heavy industries comparable to injection molding and machining. Quite the opposite – curler screws can produce the smallest displacements (actions) of any screw know-how whereas sustaining extraordinarily quiet and easy operation, making them superb for purposes in all kinds of robotic fields.
What robots want: Excessive effectivity, compact dimension
In relation to precision screw applied sciences, there are three primary selections: lead screws, ball screws, and curler screws. Lead screws are versatile of their design and materials choices, however they undergo from comparatively poor effectivity and cargo capability. Ball screws have good effectivity, however when the appliance requires a small screw diameter and low lead, load capability suffers as a result of the load-carrying balls should even be very small. Curler screws, however, have good thrust drive capabilities in a compact general dimension, together with glorious effectivity – one of the best of all worlds. Working example: When evaluating the load capability and effectivity values for various screw applied sciences of comparable diameters, all with a 1 mm lead, a curler screw has 4 instances the load capability of a ball screw with effectivity that’s twice as excessive as that of a lead screw.
A curler screw with a 1 mm lead has 4 instances the load capability of a equally sized ball screw and twice the effectivity of a equally sized lead screw.
This mix of efficiency and design traits makes curler screws a great answer for a lot of robotic and robot-related purposes. For instance, robots that use linear activation for joint linkages (just like the way in which your bicep muscle controls the motion of your forearm) profit from the upper load score and decrease weight of curler screw actuators.
In robotic gripper purposes, curler screws can present the extraordinarily excessive ranges of holding drive which might be required for safe clamping – and may accomplish that with a minimal torque enter. The important thing to this mixture of excessive drive and low enter torque is to make use of a screw with a really small lead, such because the Rollvis RVR sort recirculating curler screw, which will be manufactured with leads all the way down to 0.5 mm and even 0.25 mm
Curler screws may also be utilized in robotic finish of arm tooling. In these purposes, the curler screw’s capacity to supply excessive thrust in a small package deal gives a bonus over different options. It is because protecting weight (mass) low is critically vital for parts that sit on the finish of a robotic arm. Heavy masses positioned on the finish of the robotic arm create important inertia, making exact management of the robotic’s motion tougher and, in some instances, requiring bigger motors and different drivetrain parts. This glorious power-to-weight ratio is a key motive why robotic spot welders and auto riveters overwhelmingly use curler screws for actuation.
Developments in robotics and cell purposes
Fashionable computing, manufacturing strategies and battery know-how have led to fast developments in automation and electrification, creating a bunch of latest robotics and cell purposes that weren’t attainable only a few years in the past. One instance is the event of energetic prostheses (prosthetics which might be powered by motors), which vastly enhance perform and use for amputees.
Not like giant industrial robots, by which every joint makes use of its personal motor and gearbox, many energetic prosthetics use screw-driven linear actuation, which permits for a smaller, lighter, and stronger design. Whereas numerous kinds of screws can be utilized in energetic prostheses, curler screws supply an vital profit over different applied sciences – an unmatched performance-to-size ratio. For instance, a curler screw with a diameter of simply 3.5 mm – sufficiently small to slot in the palm of your hand – can push masses as much as 500 lb and execute actions within the micron and sub-micron vary, to higher mimic human joints and fingers.
The adoption of powered prostheses and powered exoskeletons relies upon largely on developments that make these units smaller, lighter-weight, and extra user-friendly. Curler screws contribute to all three of those goals by offering actuation capabilities within the micron and sub-micron vary, for actions that higher replicate human joints and fingers. Picture courtesy of T. Lenzi, College of Utah
Powered exoskeletons are one other rapidly-growing robotic know-how. In truth, the exoskeleton market is projected to develop by greater than 46 % from 2021 to 2026, with powered exoskeletons making up the bigger share of this progress (as in comparison with passive exoskeletons)1.
Though we’d love to have the ability to program robots to tackle any handbook process that’s too heavy or dangerous for people, there are simply too many variables for this to be sensible for a lot of purposes, comparable to trimming branches from bushes in residential yards. The answer is a human-driven (exoskeleton) or actively managed robotic. This answer combines human resolution making with decrease danger, fewer accidents, and elevated lifting capability. And like prostheses, exoskeletons face design constraints associated to weight, dimension, and complexity. Right here, too, the extraordinarily excessive force-to-size and force-to-weight ratio, make curler screws a great answer.
And the smaller and extra cell a robotic software turns into, the extra that attributes comparable to energy consumption, dimension, and weight change into constraining elements. Whether or not or not it’s drones, autonomous underwater autos (AUVs), or space-based rovers, the calls for are comparable: excessive effectivity, power, and reliability within the smallest attainable footprint. Regardless of the dimension, kind issue, or software, Rollvis provides a curler screw design that may present the best mixture of thrust drive, dimension, weight, and effectivity to enhance efficiency and reliability.
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