Research on the Formation Mechanism of Surface Morphology in Three-Excitation Ultrasonic Spatial Vibration-Assisted Turning

To improve the machining performance of different processing materials, a three-excitation ultrasonic spatial vibration-assisted turning system is proposed, which realizes the non-unity of the plane where the cutting trajectory of the tool is located. The influence and formation law of three-excitation ultrasonic spatial vibration-assisted turning on the surface roughness of the workpiece under different vibration parameters (amplitude) and machining parameters (cutting speed, cutting depth, and feed) were analyzed by response surface methodology. The results show that in terms of vibration parameters, the influence of ultrasonic vibration applied in the horizontal direction on surface roughness is significantly greater than that of ultrasonic vibration applied in the vertical direction, while the feed has the greatest influence on surface roughness, followed by cutting speed. The surface roughness of common turning, one-dimensional ultrasonic vibration-assisted turning, ultrasonic elliptical vibration-assisted turning, and three-excitation ultrasonic spatial vibration-assisted turning were theoretically analyzed and experimentally compared. The results show that compared with the other three turning methods, the three-excitation ultrasonic spatial vibration-assisted turning can obtain a lower surface roughness and have good machinability.

Sheet Turning System Design and Prototype Manufacturing Suitable for Line Systems

In the sectors where sheet metal processing machines are used, especially in line systems where punch, shears and panel bender machines are used together, sometimes it is necessary to rotate the sheet materials coming out of the punch machine before bending when they are automatically fed into the panel bender machine. In fully automatic bending lines, an automatic sheet turning system was needed in order to perform the rotation process independently of the operator. With the turning system, which is the subject of the project, it is activated in cases where materials such as stainless steel with a film coated on one side need to be rotated after cutting, and the sheet material is safely transmitted to the bending area. The system, whose prototype production has been completed, is also used together with punch, laser and shear combinations of panel bending machines, which are used in sectors such as elevator manufacturing, steel door manufacturing, panel manufacturing, kiosk and control panel manufacturing, cabinet and case manufacturing, industrial cooling systems, industrial kitchen manufacturing.

Concept of high mobility wheelchair with hydrostatic drive system

The article presents the concept of a high mobility wheelchair with a hydrostatic drive system .It presents existing solutions of manually driven wheelchair and external powered solutions. It was proposed original drive system, suspension system and turning system unheard in wheelchairs. It was analyzed the distribution of required components. On this basis there was created dynamic model. It was subjected to tests determining the driver's comfort and the load on the structure. The strength analysis of the proposed structure was carried out. As the result, it was created an innovative concept of the high mobility wheelchair capable to moving everywhere where other people can do.