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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Axial flow compressor and expansion turbine blade hub all processing programming technology Machining Programming Technology for Axial Compressor and Expanded Turbine Blade Hub
I. Introduction Axial compressors and axial-flow swells are widely used in metallurgy, petrochemical, air separation, high-restriction acid, etc. The rotor intermediate part blades are selected from the airfoil type to be distorted and shaped. Usually, the blade type root processing and the spindle groove processing are used to assemble the rotor parts, so that the assembly precision makes the blade root and the spindle groove cooperation precision become the weak link of the rotor strength. For the disposal of this problem, the fluid machinery industry has chosen the eucalyptus tree. A variety of blade root methods, such as type, dovetail type, and æˆ type 礅 coarse clamping type; for the progress of cooperation precision, the aviation industry has chosen the method of grooving and root grinding, but the processing cost is very expensive. The precedent of milling all the blades and the hub is used to deal with this problem well; the middle of this problem is the mathematical modeling and programming of the ternary flow impeller for the treatment of the free surface.| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
2. Overview of the whole CNC machining of the ternary impeller, the current stage is established on the base of the linear element, that is, the uniformly distributed blade on the impeller is processed, and the blade and impeller on the free surface (Fig. 1) are compared. There are few studies, especially the axial flow type ternary blade wheel, which has no precedent in China. Therefore, the meaning here is to explore a numerical control programming method suitable for the space free surface impeller. Prove in theory.
Third, Camand software and three-way impeller introduction 1. Camand is a professional CAM software developer. A general-purpose CAM software package developed by CAMAX in the United States contains seven detailed software packages:
(1) CamandPartmaker is suitable for 2.5-axis milling programming, and can provide 4th or 5th positioning function, including wire frame shape, graphic transformation, drawing, marking and other fundamental external methods, as well as fundamental curve processing and drilling. , cavity and shape processing functions;
(2) In addition to all the functions of CamandPartmaker, CamandNC can support 3-axis linkage NC programming, together with basic surface modeling and modification functions;
(3) CamandModeler is used to establish and modify any messy three-dimensional parts model;
(4) CamandMachinist contains the full functions of CamandNC and CamandModeler, the software actively handles the dry and view of the tool, the toolholder and the tool holder;
(5) CamandMultax, in addition to all functions of CamandMachinist, its common 5-axis linkage machining programming function is the essence of Camand software. It can supply more than 10 kinds of 5-axis machining methods. Users can investigate machine tools, parts and tools on the computer. Linkage to facilitate program verification;
(6) CamandWireEDM 2 ~ 5 axis cutting programming software package;
(7) CamandLathe is used to generate tool position rails for 2-axis to 4-axis CNC turning. With the strong support of these software packages, Camand has a strong programming and non-uniform rational B-spline (NURBS) surface shape function. The actual machine tool motion simulation function, perfect post-disposal and rich software interface equipment. It can actively generate 2-axis to 5-axis linkage tool position track of chaotic surface. It can be widely used in aviation, aerospace, electronics, mold, automobile, etc. Industrial category.
2. The ternary impeller is drawn according to the ternary activity inside the fluid machine, which can greatly reduce energy consumption and improve power. The processing of the semi-open three-element impeller refers to the whole milling process of the hub and the blade on a whole blank. Instead of selecting the blade with the blade root to be machined and assembled to the hub with the corresponding groove in the circumferential direction, the blade is evenly distributed on the impeller to distort the blade, and the space between the two blades is small. (The minimum straight line spacing between the two blades in the above figure is 7. 1mm, the maximum is 34mm), so it is very difficult to process.
Programming of four or three yuan impellers. Impeller mathematical modeling The condition of Camand programming of the three-element impeller is its appearance. Firstly, the various profile data of the blade is written into a text file (usually used in dat or .txt format), and the spline is formed by the file transformation instruction in the software. Curve → Lifting surface → Forming the blade surface → Forming the impeller with the good shape of the wheel.
2. Impeller roughing (1) Equipment and workpiece clamping: The workpiece is leveled on the inner hole and the bottom surface, and then placed on the fixture, find and concentric with the counter, and compact. Use CincinnatiH5- 800XT5 axis linkage horizontal machining for cutting in the middle.
(2) Determination of the processing plan: Before the entire impeller is processed, it is faced with an entire cylindrical blank. It can be seen from the appearance that the impeller is axisymmetric and center-symmetric. To process the blade, only one airflow channel needs to be considered. Machining, including the bottom flow path processing; the inner arc surface of the blade and the inner arc surface of the adjacent blade and the root fillet processing. Most of the contents are processed. In the theoretical processing, the multi-coordinate multi-free motion of the CNC machine tool is used for repetition. 3. Processing the above three parts constitutes the desired impeller.
(3) Selection of cutting tools: 5-axis simultaneous machining of parts, the selection of reasonable tool parameters is a very important part, according to the workpiece raw materials, the tool samples are supplied by the supplier to determine the tool raw materials (high-speed steel, hard alloy and coating) Etc.), roughing tools should try to use large diameter, short flat bottom milling cutter, many, large pass to remove the margin; finishing processing according to the line trend is determined as ball end mill or ball end taper end mill.
(4) Flow path roughing: Aligning the ternary impeller is mainly composed of cluttered combined curved surface, the weight of the blank is large, the machining allowance is uneven, and the rough machining workload is large. The layered section method is used, and the diameter is different. The cutting tool efficiently and quickly cuts off the primary margin of the blank, and slots the airflow channel. In the programming method, the Tilt method in the 5-axis linkage processing supplied by Camand is used to divide the bottom surface of the processing target flow path into red. Adjacent blade profiles and bottom surfaces serve as dry and viewing surfaces, and each of them is processed by Tilt method. Thus, the selected programming target surface area is relatively small, and it is easier to manipulate the tool position under the condition of selecting the largest tool. Vector and tool position track, can easily complete the flow channel slotting process.
3. Leaf type finishing In the leaf type finishing, from the two aspects of processing power and drawing demand accuracy, if the leaf type is very fierce, it can be processed differently for the back arc surface and the inner arc surface of the blade. It can be processed by the Tilt method with the groove of the front flow channel. The tool only needs to adjust the viewpoint between the tool position vector and the curved surface to ensure that the tool and the inner arc surface and the individual (back arc surface) are not dry. As for the inner arc surface, Because it is a concave surface, the tool is difficult to enter the bottom surface. In this case, using the Interp method to process, the tool position vector of 4 corner points can be selected accurately and accurately, and the leaf type finishing can be completed smoothly.
4. CNC machines with different post-treatments often use different instruction methods. The difference between them can be very large. Camand is a general-purpose software package. The NC program written with it has universality and can be used on any machine tool. In the NC programming, the pre-disposal and the post-disposal are separated. The above-mentioned all are pre-disposal, firstly the tool coordinate data conversion and swing angle accounting, etc. On this basis, the Camand post-disposal procedure for the machine tool is drawn. At the end, the tool track and various machining control information are transformed into a command pattern that meets the requirements of the machine tool. The following is a section of the Cincinnati H5-800XT machining intermediate A2100 CNC system:
N2G90G71G80G40G17M09N3M06T01N4S1000M03N5G00Z675. 68N6X0. Y20. A0. B0. M08N7X. 878Y17. 12Z675. 668A. 439B-. 168N8X9.372Y-37.018Z675.643N9X9.428Z695.007N10G01Y-36.673Z650.009F127. N11X9. 517Y-36. 787Z650.006A. 437B-. 32N12X9. 528Y-36. 311Z650.009A. 358B-. 406N13X9. 475Y-36. 512Z650. 01A. 375B-. 475N14X9. 278Y-39. 839Z649.986A. 819B-. 63
V. Summary Using the above programming methods, the free-form surface impeller programming can be completed and verified by theory. The following guidelines should be followed in processing.
(1) In the calculation of the tool position orbit, the requirements of the “drag†processing must be followed to avoid the appearance of the knife.
(2) The best finishing of the leaf type is carried out together with the root processing to ensure the roughness of the blade.
(3) In the case of segmental processing, in order to ensure that the junction is in conformity, the two sections of the surface can be covered with each other. Under the condition of conditional agreement, the arc infeed and the arc retraction are selected.
(4) When layering along the length of the leaf, it must be considered that the profile is distorted, and it is not possible to simply promote the original underside to avoid overcutting.
(5) After the rough machining of the bottom surface of the runner, the finishing cutter is selected according to the theoretical situation. Since the machining allowance of the profile is not uniform at the moment, the experimental method of the whole machining method is successful, and the fluid machine of such layout is applied. Theoretical production has laid the foundation for a new way to improve the processing of leaf roots and its resistance to fatigue.
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Machining Programming Technology for Axial Compressor and Expanded Turbine Blade Hub
Source: China Bearing Network Time: 2018-01-01