In the planning of the workpiece processing route, attention should be paid to the arrangement of the processing sequence, the structure of the parts and the condition of the blank, as well as the positioning, installation and clamping. There are mainly the following principles:
(1) The processing of the previous process does not affect the positioning and clamping of the next process.
(2) The processing steps are gradually carried out from coarse to fine, and the machining allowance is from large to small.
(3) The inner cavity is processed first, and then the outer shape is processed.
The processing technology and processing method planning is the detailed design of the implementation of the processing route. Specifically include:
(1) Select a suitable tool for different machining areas and machining processes.
(2) Select a reasonable tool path for different processing areas, processing types, and machining processes.
(3) Determine the error link and error control parameters related to programming to ensure the accuracy of CNC machining and the actual machining accuracy.
(4) Cutting process control (including backfeeding amount, feed rate, spindle speed), machining allowance control and advance and retract knife control.
(5) Safety control includes safety height and avoidance area.
The parameter setting is the specific implementation of the process. We will not repeat them here. The following is an example of the PROE/CAM application.
Figure 4
A simplified view of the part is shown in Figure 4. Through analysis: We decided to process the six elements on the ordinary machine tool, and then process the various elements on the CNC milling machine. First create a three-dimensional model (Figure 5).
Figure 5
Process analysis and planning: (1) Processing object: elliptical spherical surface, Φ160mm hole, 4 elliptical holes.
(2) Tool setting: Φ40mm ball milling cutter is used for ellipsoidal spherical processing, Φ40mm vertical milling cutter is used for Φ160mm hole, and Φ20mm end milling cutter is used for 4 elliptical holes.
(3) Processing sequence: elliptical spherical surface → Φ160mm hole → 4 elliptical holes, which are divided into roughing and finishing.
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