Large rotary workpiece positioning jig design, not of metal

Large rotary workpiece positioning jig design 2018 -, not of metal 07 - 19 xiaofei ( Qiqihar second machine tool group co. , LTD design institute, heilongjiang 161005). With the development of modern industrial technology, large non-metal rotary workpiece applications in aerospace, energy, and textile industries more and more widely. Such artifacts, their strength is weak, because of the large dimension cause clamping process become the key problem. As shown in figure 1, the company development and production of Q2/5 & times; 20 large non-metal CNC milling machine, the shape of workpiece size up to 20 m to 5 m, length, diameter and machining to the end, Spherical cap side) And cylindrical, when processing, rotary motion artifacts, rotary motion artifacts in the need for axial positioning, the traditional positioning jig for using the technology of ring forming ring rail structure, the way the workpiece clamping is not convenient, cost is high, so need a new positioning jig, in order to quickly solve this kind of workpiece clamping positioning problem. 1 workpiece processing route for four axis machine tool control, arbitrary three linkage. Machine installed with cylindrical workpiece bus parallel side, in the process of workpieces, move through the head, the tool rest Angle, cutting tool machine tool feed linkage, implementation of cylinder spiral milling processing. Processing range is 1/8 of a cylinder is 45 & deg; In the process, after 1/8, the workpiece rotation in turn 45 & deg; Processing the remaining part respectively, and 8 finished in time. To make the machine tool has a good cost performance, the machine tool of X to the trip ( The maximum length of machining of cylindrical surface) Design of 9500 mm, need two complete when processing, processing after the half, will lift the reversing the clamping workpiece, then processing and the other half. This does not affect the processing efficiency, because the ball crown surface processing, end also need to adjust after the completion of surface machining. In machining process, to ensure the thickness of cylinder processing requirements, using capacitance sensors installed in the numerical control machine tool slide nose, real-time detection on the surface of the cylindrical geometry size and feedback to the control system, the real-time control tool feed, realize the thickness of cylinder is processing. Work-piece processing route for: spraying foam & rarr; Workpiece installation, dividing positioning & rarr; After grinding geometry data detection & rarr; Data preprocessing & rarr; Machining surface geometric modelling & rarr; Process design & rarr; CNC programming and simulation & rarr; Artifacts secondary loading card & rarr; The numerical control actual contour processing. 2 the workpiece positioning jig structure artifacts ( See figure 2) The positioning of the tooling as shown in figure 3. Workpiece ring after the installation process, through the disc spring group to provide clamping force bearing, squeezing process ring to the positioning bearing ( A total of two working point, the two sets of device) Process, make the workpiece rotates ring abuts on the locating bearing all the time, the purpose of implementation artifacts axial positioning. Specific implementation plan: as shown in figure 4, workpiece ring after the installation process, the technology of ring placed between two bearing, rotating the long handle, piston fixed at this time, the plug rod along the direction key 14 axial movement, To the right) 。 18 when bearing and bearing 20 near the close process, continue to spin long handle, and the piston along the guide key 8 with stopper rod 15 do reverse direction ( To the left) 。 Generated by spacer compressed disc spring group, clamping force, clamping force by pointer, according to the bearing of 18 and 20 bearing ring compression process at the same time two ends, complete ring axial positioning process. 3 conclusion this positioning jig has practical application in my company development and production of Q2/5 & times; 20 large non-metal CNC milling machine. Proved by practice that this tooling clamping, convenient, low cost, to overcome the large non-metal rotary type of workpiece rotary movement, its own strength weak because of the large dimension and its deformation caused by the processing error, solved the large non-metal rotary axial positioning problem in machining the outer class. Source: the metal processing ( Cold working) Magazine,