Torque ball bushings and shafts
Always keep your distance
A recirculating chain system that feeds and removes workpieces to and from the machining center in a synchronized and position-oriented manner should be able to transport components of different sizes. For this purpose, the distance between the two profile strands on which the components lie can be changed via an adjustment unit. Torque ball bushes and shafts from Dr. Tretter enable this adjustment to be made in parallel and smoothly.
"What makes us so competitive?" Sabine Eßer doesn't think twice: "With the modules and components for profile and conveyor technology, we meet almost all of our customers' requirements. In conveyor technology, for example, we supply the complete interlinking right up to the processing machine, and we do so in high quality - despite the price pressure that prevails in the industry." The automation expert is Group Leader at Maschinenbau Kitz.
The company in Troisdorf, North Rhine-Westphalia, acts as the parent company of the mk Technology Group, which includes branches in Gera, Spain, the Netherlands, Austria, Switzerland and the USA. Of the group's 460 employees, 264 work in Troisdorf alone. The conveyor systems are used, for example, for internal transportation in automotive production, mechanical engineering, electrical engineering and in the food, pharmaceutical and packaging industries. The systems are assembled and commissioned at the Troisdorf site. In addition to in-house production, suppliers play an important role for the machine manufacturer. "We attach great importance to reliability, price, adherence to delivery dates and rapid delivery when it comes to our partners," explains Eßer. One of the selected suppliers is Dr. Tretter from the Swabian town of Rechberghausen. "We are particularly impressed by the high quality of the components. This includes the high-performance torque ball bushings and shafts," says the group manager.
Solutions from the modular system
"With the extensive modular system of profile and conveyor technology, we can customize our standard solutions," says Eßer. The machine manufacturer produces around 4,000 to 6,000 functional modules a year, with an export quota of just under 20 percent. One of the latest developments is the TKU 2040 chain conveyor system, which is particularly suitable for the machine tool and plastics industries as well as the automotive sector. In use, for example, a handling unit, a robot or an employee supplies the recirculating chain system with the workpieces. The conveyor feeds them to or from the machining center in a defined and position-oriented manner. "The cycle is based on a fixed cycle that the user can configure individually," explains Eßer. "We also supply the fixed interlinking to the various machining stations for this solution."
The belt body consists of two chain conveyors - the profile strands. In addition, there are sliding guides for the double roller chain as the transport medium. Plastic or brass prisms or workpiece carriers can be attached to the conveyor chain as workpiece holders. The chain is safely guided by wheels in the deflection. "The important thing about this system is that the user can convey workpieces of different sizes," explains Eßer. To this end, the designers have screwed the conveyor body onto an adjustment unit.
If a component change is required, an employee can move the profile strand both manually and automatically and change the distance accordingly using a handwheel. The design challenge is that both profile sections are coupled together. The motor therefore not only drives one strand, but also the other. "This means that parallel adjustment on the shaft is absolutely essential," explains Eßer. "If the strand to be moved is tilted, smooth operation is no longer guaranteed and there is also considerable wear."
In the past, splined shafts or shafts with long keyways were used for the adjustment movement in comparable systems. "Before delivery, we had of course adjusted each system accordingly and tested its function," says Eßer. "However, the settings could become loose during transportation on the loading areas of the trucks, and the adjustment units often no longer functioned when used by the customer. There were always complaints."
Compact and high-quality machine elements
In their search for a solution for the new chain recirculation systems, the mechanical engineers came across the torque ball bushings from Dr. Tretter. They are installed in the deflection rollers and transfer the drive torque to the profile strand. "These high-precision longitudinal guidance systems for torque transmission enable smooth parallel adjustment of the profile sections in any position without them tilting. This is ensured by the rolling element ball," explains Detlef Stracke. He is a sales representative for Dr. Tretter and also supported Maschinenbau Kitz with this project.
The torque ball bushing only experiences a transverse force. During transmission, the bushings fulfill the function of a splined shaft. The special feature is that no stick-slip effect occurs due to the rolling element. The translation movement is almost jerk-free. In torque ball bushings, the ball runs in ground grooves. This means that these machine elements are significantly less prone to wear than splined shafts. This is due to the geometry of the contacting bodies. The concave circular arc groove fits snugly against the convex ball. The engineers at Maschinenbau Kitz also have the advantage of being able to realize very compact designs with the torque ball bushings.
"Even if the machine elements are a little more expensive, in the end we get the cheaper solution," summarizes Eßer. "If we need components such as the torque ball bushings, we simply send the drawing with the relevant dimensions to Dr. Tretter. We then receive the complete component with the matching shaft and just have to install it." am
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