Part drawing dimensions should be easy to program.
In actual production, component drawing dimensions have a significant impact on the process, so different requirements should be put forward for component design drawings.
2. Analyze the deformation of parts to ensure necessary machining accuracy
The cutting force generated during the processing of thin substrates and ribs and the elastic retreat of the thin plate make the vibration of the processing surface very large, so it is difficult to ensure the thickness and dimensional tolerance of the thin plate, and the surface roughness increases. In CNC machining, the deformation of parts not only affects the machining quality, but also prevents further machining when the deformation is large.
Preventive measures:
(1) Improve clamping methods for wide sheet metal parts, using appropriate machining steps and tools.
(2) Use appropriate heat treatment methods: steel quenching and tempering, aluminum casting annealing
(3) In order to reduce or eliminate deformation effects, rough machining is separated and symmetrically removed.
3. Try to unify the relevant dimensions of circular arcs in the shape of parts
(1) Within the profile, the arc radius r always limits the diameter of the tool.
In components, the numerical consistency of concave arc radius is crucial to the technological performance of CNC. In order to reduce the number of tool changes, it is best to use a uniform geometric type and size for the shape and groove of the part.
Generally speaking, even if complete unification is not required, it is necessary to group circular arc radii with similar values to achieve partial unification, minimize the specification of end mills and tool replacement times, and prevent frequent tool replacement from increasing the number of shipments and surface quality degradation on the machined surface of parts.
(2) Effect of converting arc radius values
The radius of the converted arc is large, and using a larger finger finishing milling tool can improve efficiency, improve the quality of the machined surface, and thus improve process efficiency.
The larger the fillet radius r of the groove bottom fillet or the intersection of the bottom plate and the rib of the milling surface, the poorer the function of the milling tool in milling the plane, and the lower the efficiency. When r reaches a certain level, it must be processed with a ball end mill.
If the bottom surface area milled is large and the bottom arc r is also large, only two end milling cutter parts with different r can be cut.
4. Ensure the principle of uniform standards
Although some parts must be reinstalled during machining, the CNC cannot pick up the tool, so the tool often does not contact when reinstalling parts. In this case, it is best to use a uniform reference position, so the part must contain appropriate holes as reference holes. If the part does not have a reference hole, you can also set the processing hole as the reference, especially the reference.