Design process of the most popular vertical mounte

2022-08-16
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Introduction in 2004, our company cooperated with Dalian Machine Tool Plant in technology to design and manufacture the machine tool guide rail profile of machine tool, as shown in Figure 1. The guide rail of the machine tool is gray iron casting, with large blank allowance (15mm) and uneven, long processing distance (up to 9m), and poor processing conditions, which often leads to the cutting phenomenon of the original flat blade machine clamp milling cutter, affecting the processing accuracy and production efficiency. Because the flat blade machine clamp milling cutter is not suitable for combination use, it needs to mill each side separately, and the milling processing time is long, so the machining dimensional accuracy is affected. Therefore, the form of vertical blade is adopted to increase the strength of milling cutter, arrange the blades reasonably for the larger sectional surface, and cut in turn, so as to reduce the cutting load of each blade. At the same time, the machining milling cutter of each surface is combined coaxially to ensure the one-time milling of complex surfaces

Fig. 1 sectional drawing of machine tool guide rail

2 design scheme

1) arrangement of profile wheel cutter teeth

in order to ensure the stability of the cutting process, the number of wheel cutter teeth of each profile should be the same, and the arrangement of cutter teeth is shown in Fig. 2. According to the different diameters of milling cutters, the range of tooth pitch is determined to be 50 ~ 6, which is unavoidable. 0mm not only ensures the strength of the cutter body, but also ensures the continuity of cutting and reduces cutting vibration. Because the number of cutter teeth in this arrangement must be a multiple of the number of profile wheel cutting groups, for example, when the profile width is 60mm and the milling cutter diameter is f235, four groups of blade wheel cutting are required, and the number of cutter teeth can only be 12 or 16, so the tooth pitch is larger or smaller respectively. In view of this situation, 2. Install the mandrel according to the diameter of the production and processing goods and the provisions of the steel bar hoop bending machine. When the power of the machine tool allows, the arrangement method shown in Figure 2b is adopted

a) b)

Figure 2 cutter tooth arrangement figure

due to the combination of multiple cutters during processing, the position of each cutter is relatively fixed, that is, the diameter of the outer circle of the milling cutter is basically determined, and the number of cutter teeth can be determined by the above cutter tooth arrangement method

2) determination of cutting angle

because the processing material is gray cast iron, the tensile strength is low, and the chips are broken chips, the side front angle is determined to be -8 °, naturally forming a cutting back angle of 8O. Similarly, the back rake angle is also determined to be -8 °, which ensures the cutting back angle of the end teeth and makes the flow direction of chips more reasonable. For the angle inclined plane, if there is a back rake angle, there will be an angle deviation (the reasons for the deviation will be described later). Therefore, the design angle of the back rake angle of the angle milling cutter used for processing the inclined plane is set as 0 °. Using this double negative cutting edge method, because the blade has no back angle, not only the blade strength is high, but also the utilization rate of the blade can be doubled, and the economy is better

Figure 3 reasonable determination of radial rake angle

large diameter milling cutter needs to verify the side rake angle. As shown in Figure 3, because the curvature of the large diameter milling cutter body is small, if the side rake angle of the cutter tooth is large, the rear face of the top edge will sink into the cutter body, which is the same as the last revision body. Therefore, The constraint condition is

, where R - milling foam plastic is assumed not to be received, and the tool radius

r - tool body radius

k - blade width

is used when the rake angle is calculated γ

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