Need guidance and help in understanding and interpretation of some data regarding the components forces that we get from the dynamometer after the side milling (up and down) operation. After the side milling operation we get three force components from the dynamometer i.e. Fx, Fy and Fz. The VMC workbench/machine table moves only in the Y direction. The spindle hub with the tool can move in two directions i.e. x-direction and z-direction.
For the Down milling operation the tool feeds in the forward (+y) direction. So we consider Fy as the feed force as it is parallel to the direction of the feed. In addition to this, we take Fx as the tangential cutting force as it is perpendicular to feed direction (y direction).
For the Up milling operation the tool feeds in the backward (-y) direction. So we consider the Fy as the feed force and Fx as the tangential cutting force.
The Fx, Fy and Fz values obtained from the dynamometer after the milling operation are given below:
For Down-Milling operation:
Fx = 543 N, Fy = 375 N, Fz = 65 N.
For Up-Milling operation:
Fx = 334 N, Fy = 608 N, Fz = 89 N.
When we calculate the Friction Coefficient of both the operation (up milling and down milling). We find that the COF value for the down milling operation is around 0.8975 but the value of the COF for the up milling operation is exceeding 1. Please let us know if we are making any mistake in selection of the tangential cutting force (Fc) and feed force (Ff). And if we are selecting the right component forces then how the value in the case of up milling exceeds 1.
For calculating the COF we use the attached equation and the machine setup with the axis (x,y&z) details. In addition to this the Dynamometer analysis is also attached with the mail. Please find the attachment.
Possible, this phenomena may be explained by the failure process during cycle of milling.
Alexey Gavrilin нет, сэр, мы не изменяем ни один из параметров, таких как скорость резания, подача, геометрия инструмента, материал заготовки, а также смазка. Все вышеперечисленное остается неизменным как для процесса фрезерования вверх, так и для фрезерования вниз.
Также ни в одном из процессов не сообщается о сбоях.
net, ser, my ne izmenyayem ni odin iz parametrov, takikh kak skorost' rezaniya, podacha, geometriya instrumenta, material zagotovki, a takzhe smazka. Vse vysheperechislennoye ostayetsya neizmennym kak dlya protsessa frezerovaniya vverkh, tak i dlya frezerovaniya vniz. Takzhe ni v odnom iz protsessov ne soobshchayetsya o sboyakh.
Serge V. Shil’ko
Dear sir we have also done the post analysis of the tool as well as the milling process but no failure is been reported. we have repeated this test thrice but the result remain the same for all three studies. For upmilling process the COF come more that is true but how can it exceed the 1.
попробуйте составить 3-х или 5 факторного план эксперимента и реализовать его
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