RU179047U1 - END MILL - Google Patents

Abstract

ABSTRACT (57) The end mill refers to the field of metalworking, namely, to end mills and can be used for machining parts, including those having curved surface sections. In the end milling cutter, made of cermet and containing a shank (1), cutting a part (2) with helical teeth (3), separated by grooves (4) for chip evacuation, an end face (5) of a cutting part having a shape consisting of an undercut (6) and an angular radius (7). The value of the front angle of the peripheral teeth (8) of the cutting part is -10º. The value of the rake angle (9) of the front teeth of the cutting part is 0º. The technical results of the proposed solution are to increase the strength of the cutter while reducing the likelihood of a chipping of the cutting edge, increase the service life of the cutter, provide processing at higher speeds, 2 zpf, 4 Ill. Referent: Goncharuk M.V.

Description

B23C5 / 10

END MILL

The proposed device relates to the field of metalworking, namely, to end mills and can be used for processing parts, including those having curved surface sections.

 The prior art keyway mill for machining with a large feed and a shallow depth of passage and a method for milling a part with a specified mill. The cutter contains a carbide rod extended along the axis of rotation, and a ceramic head that is soldered to one end of the rod and contains teeth evenly spaced around the axis of the cutter and separated from each other by a chip cavity [RU 2475340, B23C 5/10, 10.03. 2010]. A disadvantage of the known solution is the manufacture of a cutter in two parts, since during the machining the torsional forces experienced by the cutting tool lead to the formation of significant shear forces at the weld site, which can reduce its strength, lead to the separation of the cutter head and damage the workpiece. This decision was made on the nearest equivalent. The technical problem of the proposed utility model is the creation of a reliable, rigid design of the cutter with an extended service life and with strength characteristics that allow to increase the processing speed.

        The technical results of the proposed solution are to increase the strength of the cutter while reducing the likelihood of chipping of the cutting edge, increasing the life of the cutter, providing the possibility of processing at high speeds.

The specified result is achieved by the fact that in the end milling cutter containing the shank and the cutting part with helical teeth separated by grooves for chip evacuation, according to the claimed utility model, the milling cutter is made of mineral-ceramic, the value of the front angle of the peripheral teeth of the cutting part is -10º, and the value the front angle of the end teeth of the cutting part is 0º. In the mill, the end angle of the helix and the pitch of the helical teeth can be made variable. The combination of the geometric characteristics of the end mill with the implementation of its monolithic of mineral ceramics provides the claimed technical results. The implementation of the end milling cutter of mineral ceramics provides a more rigid and durable structure due to the absence of soldered joints. In addition, this design allows processing at higher speeds, allowing an increase in temperature in the cutting zone. It is known that sharp corners of the cutting part cause chipping of the cutting edge and failure of tools; obtuse angles cause overheating and stacking of chips in pockets as a result of increased cutting forces, which can lead to breakage of the end mill (Yashcheritsyn P.I., Feldstein E.E., Kornievich M.A. Cutting Theory Textbook. - 2nd ed. , rev. and add. - Mn .: New knowledge, 2006. - 512 pp.: ill. - (Technical education); Yascheritsyn P.I. Fundamentals of material cutting and cutting tools. Textbook for Engineering Specialized Universities / P. I. Yashcheritsyn, M. L. Eremenko, N. I. Zhigalko. - 2nd ed., Additional and revised. - Mn .: Higher school, 1981. - 560 c.). The use of the claimed combination of the values of the front angle of the peripheral teeth of the cutting part and the front angle of the front teeth of the cutting part reduces the likelihood of chipping of the cutting edge (which is important, including for the operation of brittle cermets), ensures the strength of the cutter, the increase in its service life and the possibility of processing at higher speeds . The values of these angles are selected experimentally. The research results are presented in Table 1. Performing the helix angle and pitch of the helical teeth with variables reduces the likelihood of resonance and the level of vibration as a whole, which also reduces the likelihood of chipping of the cutting edge and provides the claimed technical results. The end mill is illustrated by drawings, in which Fig. 1 is a general view of the end mill, in Fig. 2 is a view A of Fig. 1, in Fig. 3 is a cross-section OO in Fig. 1, and Fig. 4 is a section CC in Fig. 2.

The end mill is made of monolithic ceramics and contains a shank 1 (Fig. 1), a cutting part 2 with helical teeth 3, separated by grooves 4 for chip evacuation. The end face 5 of the cutting part 2 has a shape consisting of an undercut 6, which prevents friction between the end 5 and the workpiece surface, and the angular radius 7. The value of the front angle of the peripheral teeth 8 of the cutting part (Fig. 3) is -10º. The value of the rake angle 9 of the end teeth of the cutting part (figure 4) is 0º. The angle of inclination of the spiral 10 is less than the angle of inclination of the spiral 11. The pitch of the helical teeth 3 is made variable (not shown in the figure).

The end mill works as follows. The working stroke is performed by the line method, the end mill is moved along the line along the surface of the workpiece. When the end mill rotates, the surface treatment of the workpiece is carried out by the surface of the helical teeth 3 of the cutting part 2 of the end mill and the surface of the end face 5.

A distinctive feature of the use of mineral ceramics as a tool material is its ability to maintain its physical and mechanical properties at such temperatures at which softening of the processed material occurs — a heat-resistant alloy based on nickel (after 800 ° C). At the same time, it becomes possible to significantly accelerate the cutting speed, reaching values of 800 m / min or more, which is not achievable when using a tool made of high speed steel or hard alloy. The implementation of the end milling cutter of mineral ceramics provides a more rigid and durable structure due to the absence of soldered joints.

Based on the studies conducted by the applicant, a new profile of the processing tool was designed and experimentally verified, namely, the end milling cutter was declared.

Claims (3)

1. The end mill, containing a shank and a cutting part with helical teeth separated by grooves for chip evacuation, characterized in that it is made of a ceramic made of mineral ceramics, while the value of the front angle of the peripheral teeth of the cutting part is -10 °, and the value of the front angle of the front teeth of the cutting parts is 0 °. 2. The mill according to claim 1, characterized in that the angle of inclination of the helical spiral teeth is made variable. 3. The mill according to claim 1, characterized in that the pitch of the helical teeth is made variable.

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