In this article, we will discuss the factors that affect the quality of the milling machine milling plane and the points of attention during the steel milling process.
1. Factors affecting flatness
①The cylindricity error of circular milling cutter in circular milling; the verticality of spindle axis and feed direction of mill machine in end milling.
②The deformation of the workpiece under the influence of clamping force and milling force; the internal stress of the workpiece causes the deformation of the part after milling; the milling heat causes the thermal deformation of the workpiece.
③Mill machine table feed linearity error; mill machine tool spindle bearing axial and radial clearance.
④When milling, the width of the circular cutter or face milling cutter diameter is less than the width of the workpiece and then knife, resulting in knife marks.
2. Factors affecting surface roughness
①The milling cutter wears and the tool edge becomes dull.
②Feed rate and cutting thickness are too large.
③Milling cutter geometry parameter is not proper; milling vibration is too large; milling has the phenomenon of knife dragging.
④When milling, the choice of cutting fluid is not good. When milling, there is the accumulation of chips or the phenomenon of chip sticking.
⑤In milling, the feed stop causes the milling cutter to sink and cut out the pit on the machined surface of the workpiece.
3.Matters needing attention
(1)Milling before milling cutter, milling head, workpiece clamping is solid, the installation location is correct.
(2)Before starting to pay attention to whether the cutter head and the workpiece with the workpiece, flat pliers hit.
(3)After the cutter is rotated, check whether the direction of rotation of the cutter is correct.
(4) You should be turned on the knife to adjust the amount of knife; if the handle over the head, to eliminate the screw and nut gap, so as not to milling the wrong size.
(5)Milling is not allowed to touch the workpiece and milling cutter, are not allowed to measure the workpiece, not allowed to change the feed.
(6)Milling is not allowed to stop the cutter rotation and automatic feeding table, so as not to damage the tool, gnawing the workpiece.
(7)After the feeding is completed, the workpiece can not be immediately returned under the rotating cutter. Should first drop the milling machine table, and then exit the workpiece.
(8)Not use the feed mechanism should be tightened, after work and then release.
(9)When use flat mouth clamp clamp workpiece, it should be removed in the flat wrench and then automatically feed the workpiece.
(10)Chip should fly to the side of the milling machine bed, so as not to burn the operator.
(11)Knife test cut, adjust the installation of the cutter head, be careful not to damage the blade edge.
(12)Such as the use of four milling head, the head can be installed into a stepped cutting workpiece.