JPH0529622U - Rotary tool for cutting - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce abnormal vibration during high-speed cutting. [Structure] A rotary tool for cutting comprises a tool main body 2 and a shank 3 connected to the tool main body 2, and a tip end portion of the tool main body 2 is provided with a cutting blade tip 4 constituting a single blade.
The shank 3 is formed with balance cut portions 5 and 5 in consideration of the dynamic balance loss caused by the removal of the tip portion of the tool body 2 and the balance loss. These balance cut parts 5, 5 are
It is a substantially symmetrical position, occupies a vertical position in the axial direction, and is formed by a straight groove, an arc groove, a chamfer, or the like. As a result, the dynamic balance during high-speed cutting of the rotary tool is improved, and abnormal vibration is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary tool for cutting that is used at high speed rotation, and is particularly designed to reduce abnormal vibration.

[0002]

[Prior Art]

 Conventionally, as a rotary tool for cutting of this kind, for example, there is a small-diameter end mill having one blade. This single-blade small-diameter end mill is applied to high-speed cutting of aluminum.

[0003]

[Problems to be solved by the device]

 However, there has been a problem that when the rotational speed of the tool is increased, the dynamic balance is lost, and as a result, abnormal vibration occurs.

Therefore, the present invention is intended to reduce abnormal vibration without reducing tool rigidity.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above points, and a balance cut portion occupying a substantially symmetrical position in the circumferential direction and a vertical position in the axial direction is formed on the shank so as to be balanced with the tip removed portion of the tool body. It was made to be done.

[0006]

[Action]

 Since the rotary tool for cutting in the present invention has the balance cut portion formed on the shank, the loss of the dynamic balance due to the presence of the tip removed portion of the tool body is reduced, and the abnormal vibration of the tool is reduced accordingly. To do. Therefore, it is suitable for high-speed cutting and enables high-precision machining.

[0007]

【Example】

 An embodiment of a rotary tool for cutting according to the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a single-blade end mill composed of a round bar-shaped tool main body 2 and a shank 3 continuously provided to the tool main body 2, and a tip end portion of the tool main body 2 is In the cross section, approximately half of the cross section is removed, and the cutting blade tip 4 is attached to the remaining semicircular portion. In this case, for the cutting edge tip 4, an ultrahigh pressure sintered body of cemented carbide, cermet, ceramics or diamond, cubic boron nitride, etc. is applied.

The end mill 1 may generate abnormal vibration when it is rotated at high speed in cutting aluminum or the like. This is because the dynamic balance collapses as the tip portion of the tool body 2 is removed. Therefore, if the deviation of the dynamic balance is reduced, the abnormal vibration described above is also reduced.

For this reason, the shank 3 of the end mill 1 has a balance cut portion 5, 5. In this case, the balance cut portions 5 and 5 are formed on the shank 3 so as not to reduce the tool rigidity. The balance cut portions 5 and 5 occupy substantially symmetrical positions with respect to the circumferential direction, and occupy upper and lower positions with respect to the axial direction. As for the shapes of the balance cut portions 5 and 5, straight grooves shown by solid lines and dotted lines in FIG. 1 and arcuate grooves shown by imaginary lines can be applied. Further, balance cut portions 5 and 5 by chamfering as shown in FIG. 5 are also possible. In this case, FIG. 5 shows two pairs of chamfers.

Further, although the present embodiment is applied to the end mill 1, the present invention is not limited to this, and as shown in FIGS. 6 and 7, a single-blade drill 11 and a boring in which the same portions are denoted by the same reference numerals. It can also be applied to a rotary tool for cutting such as the cutting tool 21. Furthermore, if the above-mentioned balance cut portions 5 and 5 are to be scratched by the ridgelines during chucking, R chamfering, resin injection, etc. may be taken into consideration.

[0012]

[Effect of the device]

 As described above, according to the present invention, since the shank 3 has the predetermined balance cut portions 5 and 5, the dynamic balance between the shank 3 and the tip removed portion of the tool body 2 is good. This has the advantage of reducing the occurrence of abnormal vibration during high speed rotation. In addition, since the balance cut portions 5 and 5 do not reduce the tool rigidity, high precision machining can be expected.

[Brief description of drawings]

FIG. 1 is a front view of a one-flute end mill showing an embodiment of a rotary tool for cutting of the present invention,

[Figure 2] Left side view,

FIG. 3 is a right side view,

FIG. 4 is a partial bottom view of FIG. 2,

FIG. 5 is a partial front view of a shank portion showing another embodiment,

FIG. 6 is a partial front view of the present invention suitable for a drill,

FIG. 7 is a partial front view of the present invention applied to a boring bar.

[Explanation of symbols]

 1 End Mill 2 Tool Body 3 Shank 4 Cutting Edge Tip 5 Balance Cut Part 11 Drill 21 Boring Bit

Claims (1)

[Scope of utility model registration request] 1. A tool main body 2 and a shank 3 connected to the tool main body 2. The tip of the tool main body 2 has a transverse cross section of which approximately half is removed, and a blade is attached to the remaining portion. In a rotary tool for cutting, which is provided with a cutting edge tip 4 which constitutes the balance cutting parts 5 which occupy substantially symmetrical positions in the circumferential direction and vertical positions in the axial direction, are formed on the shank 3. A rotary tool for cutting, which is characterized by that.