Will the CNC machining precision requirements be relatively high? The thinner the better?

How can the surface roughness of cnc-processed aluminum alloy reach 0.8?

Use a milling cutter with a larger diameter, and the rotational speed should be as high as possible, but the machine tool should not vibrate. Leave 0.3-0.5mm allowance for rough milling before finishing, whether it can reach the linear speed of the milling cutter. Enough or not, the blade is sharp or not. The larger diameter of the milling cutter head is to easily achieve high linear speed, and it is not good to increase the rotation speed without increasing the diameter of the milling cutter head. In general, the roughness of 0.8 can be achieved in this way. In addition, a sufficient amount of cutting fluid should be added during fine milling.

What is the surface roughness of CNC machining?

Generally, ordinary machine tools are processed with a finish of about 3.2, and high-speed machines can reach a finish of 1.6; pay attention to the tools and cutting parameters used in processing.

Is the smaller the surface roughness value of the part, the finer it is?

1. About the profiler and the roughness meter The profiler and the roughness meter are not the same product. The main function of the profiler is to measure the contour shape of the surface of the part.

For example: groove depth, groove width, chamfering (including chamfering position, chamfering size, angle, etc.) of grooves in automobile parts, straightness of cylindrical surface element lines and other parameters. In short, the profiler reflects the macro profile of the part.

2. The function of the roughness meter is to measure the surface processing quality of the grinding/finishing process of the surface of the part. In layman's terms, it means that the surface of the part is not polished (the old national standard for roughness is called smoothness). , that is, the roughness reflects the microscopic condition of the machined surface of the part.

CNC precision machining is still involved in a wide range of industries. Why do you say this? In fact, we can see it in our daily life. It has obvious effects and is used in some mechanical equipment. There will be more. You must know that the precision machining requirements of CNC precision parts processing are also high. Why, because customers are demanding quality, and the advantages of this CNC precision parts processing itself are great, so we must do better and make more Customers trust that this is what CNC precision machining needs to do.

1. The feed path of CNC lathe milling plane parts

When milling plane parts, the side edge of end mill is usually used for cutting. In order to reduce tool marks and ensure the surface quality of parts, the cutting-in and cutting-out procedures of the tool need to be carefully designed.

When milling the outline of the outer surface, the entry and exit points of the milling cutter should cut into and out of the surface of the part along the extension line of the outline curve of the part, and should not directly cut into the part along the normal direction to avoid machining. Scratches on the surface ensure that parts are fully lubricated.

When milling the closed inner surface, if the inner curve is allowed to extend, it should be cut in and out along the tangent direction. If the inner outline curve does not allow extension, the tool can only cut in and out along the normal direction of the inner outline curve, and select the cut-in and cut-out points at the intersection of the two geometric elements of the part outline. When the inner geometric elements are tangent and have no intersection, in order to avoid leaving a notch at the general corner when the tool compensation is canceled, the cutting point of the cutting tool should be far away from the corner.

It shows the tool path when milling the outer circle with the circular interpolation method. When the full circle machining is over, do not retract the tool at the tangent point, but let the tool move for a longer distance in the tangential direction to avoid the CNC lathe tool colliding with the surface of the workpiece when the tool compensation is canceled, which will constitute the workpiece invalidation. When milling the inner arc, it is also necessary to follow the principle of cutting in from the tangential direction.

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