Milling amount is very important for using milling machines. Today let us talk about it.
1. The basic movement of milling
When using milling machine processing, the relative movement of the workpiece and the milling cutter is called milling movement. It includes the main movement and feed movement. The main movement is the rotation of the milling cutter; the feed movement is the movement of the workpiece or the rotation of the cutter.
2. Milling amount
The main elements of the milling amount are milling speed vc, feed speed vf, back cutting depth ap and side cutting depth ae, as shown in the figure.
(1) Milling speed
Milling speed is the speed of the selected point on the milling tool relative to the main movement of the workpiece. The milling speed is related to the cutter diameter and the cutter speed. When milling, according to the milling of the workpiece material, milling cutter material and other factors determine the milling speed, and then according to the mill cutter specifications (diameter) to calculate and determine the mill machine spindle speed.
(2) Feed motion parameters
According to the specific circumstances, there are three ways of expressing and measuring the amount of feed in milling.
①Each turn feed f. The amount of movement of the cutter relative to the workpiece in the direction of the feed movement per revolution.
②Each tooth into the amount of fz. Each turn of the milling cutter, a cutter tooth moves relative to the workpiece in the direction of the feed motion.
③Feeding speed vf. The amount of movement of the cutter relative to the workpiece in each direction of the feed 1min in the direction of feed motion.
In the formula, n is the milling cutter or milling machine spindle speed; Z is the number of milling cutter teeth.
At the time of milling, the feed rate fz is determined according to the machining properties. Then, the feed rate vf is calculated based on the number of teeth Z of the milling cutter and the rotational speed n of the milling cutter, and the milling machine feed rate is adjusted accordingly.
(3) Back cutting depth
Refers to the size of the milling layer measured parallel to the axis of the milling cutter.
(4) Side cutting depth
Refers to the size of the milling layer measured in the direction perpendicular to the axis of the milling cutter.