Introduce the processing difficulties of the wrong tooth profile in the face milling cutter

by:Ronix Tools     2021-05-27
The three-sided edge milling cutter has good performance and is widely used in the milling and cutting of grooves, planes, bevels, and step surfaces. However, because the two kinds of teeth in the left and right directions of the tool are staggered on the circumferential surface, the manufacturing process is cumbersome and the processing is difficult. When milling right-hand teeth, it is easy to mill the left-hand teeth, and vice versa; at the same time, because of the machining of the tool When using the through-mandrel for batch processing, the loss is greater when scrap occurs; in the past, because scientific calculation methods were not used, only a few experienced masters or professionals can be qualified for the milling of the tool, so the processing cost is high. In response to this problem, this article proposes to replace the past empirical processing with scientific calculation methods, and derives the corresponding calculation formula as well as the methods and techniques of using the formula.  The main difficulty in the manufacture of the wrong tooth profile of the three-face milling cutter is the milling of the cylindrical tooth. Because the left and right spiral teeth are arranged staggered on the cylindrical surface, the left spiral teeth must be milled after all the right spiral teeth are milled during machining. Therefore, the left spiral teeth must be reserved when milling right spiral teeth. If the reserved position is insufficient, the complete tooth profile cannot be milled when milling the left-handed tooth, resulting in waste; if the reserved position is too large, the tooth groove width is too narrow and the chip tolerance coefficient is insufficient, which is easy to cut or reduce the use life. In fact, the size of this position is controlled by the width of the tooth slot, and the width of the tooth slot is usually not given on the design drawings, so the left-hand tooth position reserved when milling right-handed teeth is difficult to control in advance. It is found that the position is wrong only when the other kind of rotation is milled backwards, but at this time it has caused a lot of waste.  The choice of the base surface of the three-face milling cutter:   1. The surface with the smallest machining allowance should be selected as the rough reference. This can ensure that the surface has sufficient machining allowance.  2. As far as possible, a flat, smooth, and sufficiently large surface should be selected as a rough reference to ensure accurate positioning and reliable clamping. Surfaces with gates, risers, flashes, and burrs should not be selected as rough benchmarks, and preliminary processing is required if necessary.  3. The rough standard should be selected based on the machined surface, in order to achieve uniform wall thickness, symmetrical appearance, and less clamping.   4. Select the important surface with uniform machining allowance as the rough reference. In this way, a small margin can be removed uniformly, and a fine structure of the surface layer can be retained to increase abrasion resistance.   5. The rough reference should avoid repeated use, because the surface of the rough reference is mostly rough and irregular. It is difficult to ensure the position accuracy between the surfaces after repeated use.
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