Yao Nan Cheng

Research on Heating Density Function and Temperature Field Mathematical Model for Milling Insert with 3D Complex Groove

Based on the milling temperature experiments and researches, we established the milling temperature mathematical model using dimension analytic method,and the heat density function and superficial heat density function of the flat milling insert and the waved-edge milling insert, whose rake face is wave curve plane and created by the authors using the diathermanous theory. We describe the mathematic model of the instantaneous temperature field by the theory of the finite moving planar sources of heat. At last, a program was done to calculate the heat density function and the milling temperature field. According to the calculated results and plotted graph, it is proven that the highest temperature is not on the knifepoint and host edge, in fact, it is offset from the host edge a certain space. So we can make the conclusion that the waved-edge milling insert’s cutting capability is higher than the flat milling insert’s which is consistent with the experimental result. All the studies above are the foundation for accurately describing the 3-D temperature field and optimizing groove.

Tool Path Planning of 5-Axis Finishing Milling Machining for Closed Blisk

To solve the difficult problem of NC machining of closed blisk, the paper combines with the structure characteristics of processing surface and the characteristics of Channel processing, and at the same time to study the technology of processing impeller channel tool path planning. By planning different processing methods of tool axis control for different processing parts, take outer arc processing as an example, tool path planning method is analyzed. By the method to generate the ruled envelope surfaces in view of blade offset surfaces, to put forward new methods of dividing plunging region. The method of surface offset was applied to determine the safety space of tool axis movement. To determine the range of tool axis angle by the relationship between the boundary curves and division the processing area by the tangent method. Finally, The results of tool path planning were verified by using five-axis processing, which proved the reasonability and feasibility of the scheme.

Experimental Study of Element Diffusion between the Material of Heavy-Duty Cemented Carbide Insert and the Material of Large Cylinder

Aiming at the problem of bonding breakage of cemented carbide insert in the process of heavy-duty cutting large cylinder, the experimental study of element diffusion between workpiece and insert material is done. Firstly, the conditions of insert bonding breakage are analyzed according to the heavy-duty cutting conditions of large cylinder and the material characteristics of workpiece and insert. And then, the experimental scheme of element diffusion is proposed. The element diffusion experiment is done, and the diffusion elements in the diffusion section of specimens are analyzed. At last, the species, distance and concentration of diffusion elements are analyzed. This provides a basis for further research of tool bonding breakage.

Experimental Study on Machinability of 2.25Cr-1Mo-0.25V Steel and Heavy Cutting Tool Life

2.25Cr-1Mo-0.25V steel is the material of key parts of major equipment in petroleum and chemical field. Aiming at its unworkability and low heavy cutting tool life, at first, the tool life comparative experiment of cutting 42CrMo steel, 2.25Cr-1Mo-0.25Vsteel and 45 steel was carried out. It was found that process ability of 2.25Cr-1Mo-0.25Vsteel was the worst, the second was 42CrMo steel. And the tool life of cutting 45 steel was 2 times more than that of 2.25Cr-1Mo-0.25Vsteel. Then the comparative experiment of different tool life of cutting 2.25Cr-1Mo-0.25Vsteel was made under the condition of heavy cutting. The service life of heavy cutting tool XF8 was significantly higher than that of YT15. At last, the factors affecting the service life of heavy cutting tool were analyzed, in order to provide basis for improving heavy cutting tool life of 2.25Cr-1Mo-0.25V steel.

The Tool Path Planning and Simulation Analysis of Surface Flank Milling for Titanium Impeller Blade

The impeller is an important typical part of machinery and equipment industry, and is widely used in energy and power, aerospace, petrochemical, metallurgy and other fields. However, due to the complex shape of the impeller blades, forming more difficult. Flank milling have many advantages, such as forming good accuracy, high efficiency. Therefore, in the paper will choose flank milling for impeller milling. Based on the properties of titanium alloy material and the external characteristics of the impeller blades, proposed control method for machining distortion of impeller blades. Using three offset method to calculate the initial tool position of cylindrical cutter flank milling undevelopable ruled surface, then calculate the initial tool position of cone ball cutter to plan tool path of milling. Through the VERICUT software to simulate the whole process of the impeller flank milling, in order to verify the tool path planning and determine the interference between the tool and the workpiece, the tool and the workpiece does not occur. Finally, through experiments to verify the feasibility of planning algorithm. The trajectory planning and simulation of flank milling titanium impeller blades are foundation of improvement the processing efficiency of the impeller blades and better surface quality.

Cutting Tool CAD / CAE Integrating System Modeling

Targeting the current status of cutting tool design long cycle and inefficient, this research presents an integrating system of cutting tool design (CAD) and simulation (CAE). First, the paper proposes the system architecture and analyzes the process. And then based on the architecture, the system prototype integrating SIEMENS NX and ANSYS is developed on the Visual Studio 2008 platform. The prototype can generate cutting tool 3D model on SIEMENS NX and continue to simulate on ANSYS based on the information from users. Finally, a kind of ball end mill is presented to certificate this system.

Study Chip Breaking Experimental and Optimal Design of Tool for Machining Cylindrical Shell Material

Large cylindrical shells are widely used in many areas of aerospace, petroleum chemical industry and nuclear power, etc. The main material of large cylindrical shells is 2.25Cr-1Mo-0.25V. In the process of heavy-duty cutting cylindrical shell material, the removal rate is high, and machine condition is rough, because the viscosity of big cylindrical shell material, the large chips not easy to be broken, and the tool and workpiece often entangled affect the machining efficiency. Researh and development to apply heavy cutting under the condition of high performance cutting tool has great practical significance, because of at the same time for heavy cutting tool is less in china. This paper uses the cutting performance experiment aiming to cylindrical shell material used in different three-dimensional groove blades and studies the range of different blades broken chips and the influence of three-dimensional groove on breaking effect. The chips form of cutting cylindrical shell material is summarized. And chip-breaking groove of the best performance is optimized. The paper designs of the new heavy-duty vehicles blade well and vertfies the good effect of the new heavy-duty cutting the breaker by the results of 3 d finite element simulation. The paper provides basis for designing heavy-duty cutting.

Process Parameters Optimization and Tool Performance Analysis for Flank Milling Titanium Blisk

In this paper, titanium as the research object, which is usually used as the aerospace engine blisk manufacturing materials, as a typical difficult-to-machine materials, on the basis of its machinability is analysis, research process bisk processing of the main types of flank milling, flank milling fundamental experiments of titanium was carried out, the cutting force of the processing is collected and analyzed in order to optimize the process parameters; Studying ball end mill for the stress analysis and modal analysis in order to obtain the stress, strain and distribution of vibrations in the flank milling titanium, which can provide a reference for future flank milling process parameters titanium blisk, and provide theoretical basis for efficient, stable and safe cutting and optimization tool design.

Experiment Research on Chips Flying Characteristics for Heavy-duty Milling

In the process of cutting, the problem of flying chips seriously affect the processor’s life safety and the processing environment of workshop. In order to study the characteristics of the chips flying, the authors selected five different kinds of commonly used milling insert, and use these milling insert in the dry milling experiments to study the process of cutting chips flying. In the paper, firstly, carried out flying track analysis on the chips, and concluded the chips flying theory, and then design the cutting experiment, through the statistical analysis of experiments data, to understand the influence of different insert groove chip and cutting parameters to chip flying, and puts forward suggestions on groove development of heavy-duty cutting inserts.

Digital Rapid Modeling Design of Heavy-Duty Cutting Blade Based on Solidworks

Heavy machinery processing industry has its own disadvantages, that is, the large size and heavy weight of workpieces. Some of them may even weigh hundreds of tons. When processing horizontal lathe, the turning diameter of it can be as long as six meters and the vertical lathe can reach ten meters. Heavy duty cutting mainly concerns about how to improve the processing efficiency, enhance the equipment utilization and to reduce energy consumption. Therefore, this proposes a higher requirement to heavy cutting tool, especially the design of the blade is of great importance. Based on the analysis of heavy cutting blade’s structure, this dissertation uses the method of parametric design which is suitable for Solidworks, with the combination of OLE and COM technology. It also utilizes Visual Basic on the Solidworks platform for secondary development and design, and develops the fast digital modeling software design. The software can not only realize the rapid modeling of heavy cutting blade, but also shorten the design cycle and improve the efficiency of the cutting tool which benefited from the convenient design of the heavy blade, which has a significantly practical application value.