How to mill the inclined plane of mechanical parts? What are the methods of milling the inclined plane

An inclined plane is a plane on a part that is inclined at any angle to the datum plane. The degree of inclination of the inclined plane relative to the reference plane is mainly measured by the inclination. In the processing and production of parts, milling is one of the main methods to process the inclined surface of parts. There are three methods of milling inclined plane on milling machine: workpiece inclined milling inclined plane, milling cutter inclined milling inclined plane and milling inclined plane with angle milling cutter.
The need of inclined plane has certain requirements for the relationship between workpiece, machine tool and tool. Generally, the following two conditions need to be met: first, the slope of the workpiece should be parallel to the feeding direction of the milling machine workbench; Second, the slope of the workpiece should coincide with the cutting position of the milling cutter, that is, when milling with a circular edge milling cutter, the slope is tangent to the outer cylindrical surface of the milling cutter; When milling with an end edge milling cutter, the inclined plane coincides with the end face of the milling cutter.

1、 Tilt the workpiece to the required angle and install the milling slope
When milling an inclined plane on a horizontal milling machine or a vertical milling machine whose end milling head cannot rotate at an angle, the workpiece can be installed at the required angle to mill the inclined plane. The following methods are commonly used:
1. Milling the inclined plane of the workpiece according to the scoring: during single piece production, first draw the processing line of the inclined plane on the workpiece, then use flat tongs to clamp the workpiece, use the scoring disc to correct that the processing line drawn on the workpiece is parallel to the feeding direction of the workbench, and mill the inclined plane with a cylindrical milling cutter or end milling cutter.
2. Turn the angle of the jaw body of the flat tongs to clamp the workpiece milling inclined plane: install the flat tongs, first correct that the fixed jaw is vertical or parallel to the spindle axis of the milling machine, and then turn the jaw body to the required angle through the scribed line on the base of the flat tongs, clamp the workpiece, and mill the required inclined plane.
3. Use the inclined sizing block to clamp the workpiece and mill the inclined plane: use the inclined sizing block to tilt the workpiece datum plane, use the flat tongs to clamp the workpiece and mill the inclined plane. The inclination of the sizing block used shall be the same as that of the inclined plane, and the width of the sizing block shall be less than the width of the workpiece. This method is convenient for milling inclined planes, clamping and correcting workpieces, easy to manufacture inclined sizing blocks, and when milling a batch of workpieces, the milling depth does not need to be readjusted with the replacement of workpieces, so it is suitable for small batch production. In mass production, special fixtures are often used to clamp the workpiece and mill the inclined plane.

2、 Tilt the milling cutter to the required angle and then mill the inclined plane
On the vertical milling machine with the rotation angle of the spindle of the end milling head, install the end milling cutter or end milling cutter, and clamp the workpiece with flat tongs or pressing plates to mill the required inclined plane. When clamping workpieces with flat tongs, there are two common methods:
1. The reference plane of the workpiece is parallel to the worktable to clamp the workpiece.
2. The reference plane of the workpiece is perpendicular to the worktable top to clamp the workpiece.
3、 Milling inclined plane with angle milling cutter
The inclined plane with narrow width can be milled with angle milling cutter. The angle of the angle milling cutter shall be selected according to the angle of the workpiece slope, and the width of the milled slope shall be less than the blade width of the angle milling cutter. When milling symmetrical double inclined planes, two angle milling cutters with the same diameter and angle and opposite cutting edges should be selected for milling at the same time. When installing the milling cutters, the cutting edges and teeth of the two milling cutters should be staggered to reduce milling force and vibration.

Because the strength of the cutter teeth of the angle milling cutter is weak, the arrangement of the cutter teeth is dense, and it is difficult to remove chips during milling, so when using the angle milling cutter for milling, the selected milling amount should be about 20% lower than that of the cylindrical milling cutter, especially the feed per tooth should be appropriately reduced. When milling carbon steel and other workpieces, sufficient cutting fluid should be applied.