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Shanks of solid carbide milling cutters
Release time:
Jan 10,2022
The shank of the whole carbide milling cutter is mainly a straight shank of a complete cylinder and a cylindrical shank with a cutting plane (commonly known as "side-fixed" or "side-fixed shank").
The shank of the whole carbide milling cutter is mainly a straight shank with a complete cylinder (see Figure 3-35) and a cylindrical shank with a cutting plane (commonly known as "side solid" or "side solid handle").
■ Straight handle
The shank of the straight shank milling cutter is a complete cylinder, so this kind of tool shank from the handle itself, the accuracy and clamping of the neutral is very good. By straight shank, it is not meant that the shank diameter dimension d1 and the working portion diameter dimension Dc are the same basic dimension. Sometimes, the working part diameter dimension Dc will be larger than the shank diameter dimension d1(Dc>d1), which is called "diameter reduction"; In another case, the working part diameter dimension Dc will be smaller than the shank diameter dimension d1(Dc When clamping a straight handle with a general clamping method (such as a spring chuck), it mainly depends on friction, so sometimes the clamping force is not enough. If a straight shank structure is used in a large helix angle milling cutter with a large axial force, it is easier to be pulled out of the chuck, especially when the "overcut" phenomenon as shown in Figure 3-5a occurs. Therefore, if a large helix angle cutter is used for side milling/groove milling, a safer chuck should be used, such as a powerful chuck or a chuck with a safe lock (Safe Lock), or a cylindrical shank with a cutting plane as described below. ■Cylindrical shank with shaved plane The other main shank structure of the solid carbide end mill is the cylindrical shank with a cutting plane (see Figure 3-37). The drive of the milling cutter with cutting plane does not rely on friction, it relies on the forced driving force of the cutting plane, so it does not produce slipping. At the same time, the cutting plane is also limited to the milling cutter in the axial direction, and the phenomenon of "cutting off" will not occur when retreating. This structure can be different according to the diameter of the shank, as shown in Figure 3-37, with only one cutting plane, or it can be a larger size with two cutting planes. These two types are not two standards, but two types of standard tool handles in different size segments. However, because the two cutting plane structure is used when the shank diameter is greater than or equal to 25mm, the milling cutter of 20mm and below is basically a single cutting plane structure.
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