a级面介绍（Level a presentation）.docVIP

a级面介绍（Level a presentation） G0 continuous One end of a contact terminal 1. a curve and a curve, we can think: two curves at the point of connection in G0 continuous state. A condition 2. a surface boundary with another surface, we can think: two surface in this boundary are connected with continuous state G0. 3. if the continuity between the two is not up to the G0 we call error, this error is an absolute error in millimeters or inches for a distance measuring unit value. G1 continuous The 1. curve at a point in a G0 continuous state, and the two normal curve in a point of the same, at this point the tangent angle is zero, we say that the two curves are G1 continuous. 2. if the surface is in a continuous curve in the G0 state, a in the surface of the B curve at any point in the surface normal direction and B curve of B the same point of the normal direction of the same, we call the two surfaces in G1. 3. if the continuity between the two is not up to the G1 we call the G1 error, this error is an absolute error, with DEG or rad as a unit of measurement value angle. G2 continuous The 1. curve at a point in a G1 continuous state vector two curves in the curvature of this point, if the two curves (vector direction and the same absolute value), we say that the two curves are G2 continuous. 2. when the surface is in a continuous state in G1 curve of A, A in the surface of any point of the A curve method and B curve in the amount of surface B the same point method with the same amount, we say that the two surfaces are G2 continuous. 3. if the continuity between the two is not up to the G2 we call the G2 error, this error is a relative error The car class a surface The car class a surface In the whole process of automobile development, a project called Class A Engineering, the key is in line with the class a surface in determining the quality of the surface can be required. The definition of the so-called class a surface, must meet the gap between adjacent surfaces below 0.