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Fracture design is a new method for separating material, the idea is to Yuduan body by manufacturing defects active and appropriate load applied thereto, to achieve rapid and low-energy Yuduan body separation. Compared with the traditional cutting methods, breaking cutting method has low energy consumption, high efficiency, saving raw materials and tool consumption and other advantages. Currently, brittle metal material for feed off the device has been some research, but widespread: complex structure, requires a lot of accompanied (eg grooving institutions, etc.), the processing cycle is long and complex process (requires pre-cut) and other shortcomings . Therefore, the design of a new feeding device off, to avoid the disadvantages of the device, so that with a simple process (not pre-cut), the structure is simple, short processing time, etc., and for a virtual development. To solve these problems, the main topic for some of the following tasks: (1) matrix crack formed human half V-shaped notch made, this paper studies the process of drawing matrix cracking idea, according to the semi-V-shaped notch at the edge of the cross-sectional area change rate greater than the V-shaped notch, so that the axial stress and the cutout notch root stress increases more significant. Therefore, crack formation of the matrix made of artificial semi V-notch concept of the brittle material so that the design of machine and then reduced snapping notch on the basis of this procedure, reducing the energy required similar bar, that bar After snapping, snapping machine vibration corresponding weakened. (2) to determine the magnitude of the load bar snapping under the compound is a key issue, this article on the stress state bar snapping were analyzed using three-point bending state matrix cracking stress intensity factor formula, derived φ30mm brittle bar snapping force required. (3) brittle materials snapping machine design in the design process: Based Stress Fracture of thought, according to the bar snapping mechanical model, drawing on the matrix crack fracture theory, the use of force closure clamping bar method, brittle material design snapping machine structure. Then, depending on the size range of machining the bar, the strength of parts designed especially critical components, to avoid stress failure of parts brought bar snapping accuracy loss. Finally, in part to meet strength requirements, the development of the size of parts. (4) virtual development: First, the use of virtual simulation technology to build brittle materials snapping machine virtual model, virtual assembly, verify that the structure is reasonable. Then, the kinematic, dynamic analysis, according to results of displacement, velocity, acceleration and other parameters of its feasibility.
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