What are the cutting parameters of a milling machine?

The cutting parameters of the milling machine mainly include the following aspects:

I. Primary Cutting Parameters

1. Cutting Speed (Vc)

• Definition: The primary cutting speed of the cutting edge relative to the workpiece, typically expressed in meters per minute (m/min).
• Impact: Cutting speed directly affects cutting heat, cutting force, and surface roughness. Excessive cutting speed can lead to increased cutting heat, workpiece deformation, and reduced surface quality; conversely, insufficient cutting speed may lower processing efficiency.

1. Feeding Speed (F)

• Definition: The feed rate of a tool relative to the workpiece per unit of time, typically expressed in millimeters per minute (mm/min) or millimeters per revolution (mm/r).
• Feed rate affects the thickness of the cutting layer and the magnitude of cutting force. Excessive feed rate can lead to increased cutting force and reduced surface quality of the workpiece; on the other hand, a slow feed rate may extend the processing time.

1. Cutting Depth (ap)

• Definition: The size of the cutting layer perpendicular to the cutting edge, usually expressed in millimeters (mm).
• Impact: The cutting depth determines the contact area between the cutting edge and the workpiece, as well as the magnitude of the cutting force. Excessive cutting depth may lead to increased surface roughness on the workpiece, even causing cracks; conversely, insufficient cutting depth may reduce processing efficiency.

Section 2: Other Relevant Parameters

1. Feed Per Tooth (af or fz)

• Definition: The relative displacement of the workpiece and milling cutter per tooth rotation, typically expressed in millimeters per tooth (mm/z).
• The effect: The feed rate per tooth directly impacts cutting force and heat. An excessively high feed rate per tooth can lead to a dramatic increase in cutting force, exacerbating tool wear; conversely, a too low feed rate per tooth may reduce processing efficiency.

1. Spindle Speed (n)

• Definition: The rotational speed of the milling spindle, typically expressed in revolutions per minute (r/min).
• The spindle speed is closely related to the cutting speed, affecting cutting heat, cutting force, and surface roughness. Both excessively high or low spindle speeds can adversely impact the quality of the machining.

1. Tool Diameter (dd)

• Definition: The diameter size of a milling cutter, typically expressed in millimeters (mm).
• The impact: The diameter of the tool affects the contact area between the cutting edge and the workpiece, as well as the magnitude of the cutting force. Selecting the appropriate tool diameter helps to improve processing efficiency and surface quality.

III. Principle of Parameter Selection

1. Select Materials Based on CharacteristicsDifferent materials exhibit varying properties such as hardness, toughness, and thermal conductivity, necessitating the selection of appropriate cutting parameters to ensure machining quality and efficiency.
2. Selecting Machining Centers Based on PerformanceMachine tool power, rigidity, and precision limitations dictate the range of cutting parameters that can be selected. When choosing cutting parameters, it is essential to ensure that the machine tool can withstand the load of the selected parameters.
3. Select according to processing requirementsDifferent requirements for processing precision, surface roughness, and efficiency necessitate selecting appropriate cutting parameters to meet processing needs.

In summary, the cutting parameters of the milling machine include cutting speed, feed rate, cutting depth, feed per tooth, spindle speed, and tool diameter, among others. When selecting these parameters, it's essential to consider factors such as material properties, machine performance, and processing requirements.