tailieunhanh - Kinematic Geometry of Surface Machinin Episode Episode 8

Tham khảo tài liệu 'kinematic geometry of surface machinin episode episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 220 Kinematic Geometry of Surface Machining which the surface Cs passes through the computed cutting edge of the formcutting tool. Third the configuration of the defined clearance surface Cs of the form-cutting tool must be of the sort for which the surface Cs makes the optimal clearance angle a with the generating surface T of the form-cutting tool at a given point of the cutting edge. It is easy to see that clearance surfaces of the cutting tool cannot always be shaped in the form that is convenient for manufacturing the cutting tool. The cutting edge of a precision form-cutting tool can be considered as a line of intersection of the three surfaces say of the generating surface T of the cutting tool of the rake surface Rs and of the clearance surface Cs. This requirement is compliant with three surfaces T Rs and Cs being the surfaces through the common line say through the cutting edge of the cutting tool that could impose strong constraints on the actual shape of the clearance surface of the cutting tool. Under such restrictions the clearance surface Cs usually cannot allow sliding over itself. However the desired surface Cs can be approximated by a surface that allows sliding over itself thus the approximation could be more convenient for design and manufacture of the form-cutting tool. This means that in certain cases of implementation of the first method approximation of the desired clearance surface Cs with a surface that features another geometry can be unavoidable. The approximation of the desired surface Cs results in the surface P being generated not with the precise surface T but with an approximated surface Tg of the cutting tool. The approximated surface Tg deviates from the desired surface T. The deviation 0T is measuring along the unit normal vector n T to the surface T at a corresponding surface point. Application of the form-cutting tool having approximated the generated surface is allowed if and only if the resultant deviation ST is within the .