Based on the analysis of two axis linkage gear cutting motion and the key structure design of gear cutting machine tool, the two axis linkage gear cutting machine tool of spiral bevel gear is simplified, and its three-dimensional model is established under the working environment of VERICUT. The component tree of the model of the new spiral bevel gear cutting machine tool is built.
According to the needs of the new method of two axis linkage tooth cutting of spiral bevel gear, z-axis assembly and y-axis assembly are added to the column assembly and horizontal base assembly respectively. The tool spindle is added to the z-axis assembly, and the x-axis, c-axis, b-axis and a-axis are added to the y-axis assembly in sequence, and finally the gear blank fixture assembly is added to the a-axis assembly. According to the established machine tool component tree, the corresponding simplified model of machine tool structure is added to each component, and finally the simplified model of spherical involute spiral bevel gear processing machine tool based on the new method of two-axis linkage gear cutting is established, as shown in the figure.
According to the motion analysis of two axis linkage gear cutting and the simplified model of spiral bevel gear cutting machine tool in Figure 6.2, the machine tool is a six axis two linkage gear cutting machine tool. The six moving axes are three moving axes (x-axis, Y-axis and Z-axis) and three rotating axes (a-axis, b-axis and c-axis). The a-axis and X-axis are the linkage axes in the process of gear cutting, and the c-axis is the rotating axis fed from the tooth top to the tooth root. The initial machining position must be adjusted before gear cutting: first, install the gear blank of spiral bevel gear to be machined on the fixture and clamp it. Then manually adjust the rotation of the tilting rotary table in the b-axis direction so that the base cone of the gear blank is tangent to the horizontal plane. Then manually adjust the position of the tilting rotary table on the connecting plate so that the base cone apex of the gear blank is located on the rotary axis – C axis of the horizontal rotary table. Finally, the tool spindle box is controlled to move in the Z direction so that the plane of the blade end is located in the tangent horizontal plane of the tooth blank base cone; Control the movement of c-axis, x-axis and y-axis so that the blade is in the initial feed position. On the basis of the above work, the rotation of gear blank can be realized by programming NC program to control the rotation of a-axis and the movement of x-axis at the same time ω 1 and the linkage cutting movement between the movement V of the gear blank along the boundary line between the adjustment area and the cutting area.