JPH0539818U - Throwaway tip for milling - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to provide a highly efficient cutting tool for a high rake throwaway end mill that is capable of free cutting and simultaneously obtaining a good finished surface. [Structure] The throw-away tip of the present invention has a clearance angle θ.
By maintaining a certain value, wear of the secondary cutting edge is reduced,
A high-quality cutting surface is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a milling cutter, particularly a high rake cutter having a large rake angle, and more particularly to a throw-away tip used for the cutter.

[0002]

[Prior Art]

 High rake cutters are used for reducing cutting resistance and highly efficient cutting, and have been put to practical use in a variety of applications. Especially when coated tips are used, long-life and highly efficient cutting is possible. However, since it is a high rake, chipping and chipping due to insufficient strength of the chip itself are prevented or reduced.Therefore, along with high rake, various measures have been taken such as softening the impact when the chip contacts the work material. There is. Further, in the conventional cutter, when the axial rake is mounted at a regular angle, the clearance angle θ at the tip end decreases as the cutting edge ridge line goes down from the leading end to the trailing end. Therefore, the radial rake is set to a large negative angle or the clearance of the tip is gradually changed to secure the clearance angle θ. (As an example, actual fair number 01-18095) Also, regarding the insert, the relief angle of the sub cutting edge portion is made larger than the relief angle of the main cutting edge portion. (As an example, Jikken 01-35777)

[0003]

[Problems to be solved by the device]

 However, the clearance angle θ of the sub cutting edge is smaller than that when the chip clearance angle of 15 degrees or 11 degrees is used due to the use of high rake and the clearance angle of 20 degrees. is the current situation. Therefore, when used for cutting such as refining steel where cutting edge retreat occurs, abrasion of the auxiliary cutting edge part makes it impossible to obtain the required surface roughness, etc. Problems such as shortened life are pointed out.

[0004]

[Means for solving the problem]

 In order to achieve the above object, the present invention has the following configuration. The effect of the relief angle θ of the sub cutting edge on the wear due to the retreat of the cutting edge due to cutting is calculated. When the relief angle θ is 5.5 °, the wear amount is 0. Corresponding to a wear amount of 0.22 mm at a retreat of the cutting edge of 0.03 mm, when the clearance angle is 7.5 °. In addition, since there is a large difference in the contact area of the sub cutting edge, it also has a great influence on the wear of the sub cutting edge and the quality of the cut surface of the work material. If this angle is large, it is advantageous in terms of wear, but on the other hand, it becomes too sharp, so it was set to 7 ° to 12 °.

[0005]

【Example】

 The present invention will be described in detail below based on embodiments. FIG. 1 shows an example of a throw-away tip according to the present invention, and FIG. 2 shows a front view of a throw-away end mill with a blade diameter of φ62. When the tip of FIG. 1 is set in a high rake end mill, the clearance angle θ is 7.5 °, which is more advantageous than 5 ° when the clearance angle is the same as the tip clearance angle. In addition, increasing the clearance angle of the main cutting edge of the chip corner is not preferable when the clearance angle of the chip itself is large.

[0006]

[Effect of the device]

 As described above, by using the throw-away insert for milling cutter of the present invention, the clearance angle θ of the auxiliary cutting edge is sufficiently secured, so the wear amount of the auxiliary cutting edge is reduced and the quality of the cutting surface is improved. It can be improved and the chip life can be stabilized.

[Brief description of drawings]

FIG. 1 shows a chip according to an embodiment of the present invention.

FIG. 2 shows an example of a throw-away end mill equipped with a tip according to the present invention.

[Explanation of symbols]

 1 Tip 2 Main cutting edge 3 Sub cutting edge 4 Tip clearance angle θ Clearance angle θ

Claims (3)

[Scope of utility model registration request] 1. A throw-away tip used for a throw-away face milling machine having an axial rake angle of 15 ° to 30 ° and having a top face serving as a rake face, a ridge line serving as a peripheral cutting edge, and each corner portion serving as a sub-cutting edge. The milling machine according to claim 1, wherein an angle between the flank including the auxiliary cutting edge near the corner and the work material (hereinafter referred to as a clearance angle θ) is 7 ° to 12 °. Throw-away tip. 2. The throw-away insert for milling cutter according to claim 1, wherein the flank of the throw-away tip has a convex curve or the inclination of a straight line on the cutting edge side is 15 ° or more with respect to the vertical line of the tip upper surface. Chips. 3. The throw-away tip for milling cutter according to claim 1, wherein the flank of the throw-away tip is stepped.