JPH0742568Y2 - Rolling tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rolling tool having a CBN chip fixed to the tip of a tool body and used for cutting steel or cast iron. .

[Prior Art] A cutting tool using a CBN chip as a cutting edge may be used for cutting a work material made of steel, cast iron or the like depending on cutting conditions and the like.

FIG. 3 and FIG. 4 show an end mill which is a kind of conventional rolling tool of this kind. This end mill 1 is composed of a substantially cylindrical tool body 2 integrally formed of steel or cemented carbide. The chip 3 made of CBN is fixed to the outer periphery of the tip portion by direct brazing with the cutting blades 4 and 5 located on the tip side and the outer periphery side of the tool body 2.

5 and 6 show another conventional end mill. The end mill 6 is provided on the outer periphery of the tip of a tool body 7 made of steel or cemented carbide, and on a base 8 made of cemented carbide. A throwaway chip 10 to which a CBN chip 9 serving as a cutting edge is fixed is detachably fixed by a clamp piece 11.

In these conventional end mills 1 and 6, the base end portions of the tool bodies 2 and 7 are gripped by a drive device (not shown) and are rotated around the axis O while being fed in the axis O or a direction orthogonal to the axis O, Grooves are machined in the work material by the cutting edges 4, 5, 12, 13 of the CBN chips 3, 9.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional end mills 1 and 6, since the tool bodies 2 and 7 are integrally formed of steel or cemented carbide, they are made of steel, for example. In some cases, if the protruding amount of the cutting blades 4, 5, 12, 13 is large, the cutting resistance causes bending and chattering easily. On the other hand, if the cutting blades are made of cemented carbide, vibration resistance is excellent, but with intermittent cutting Since the generated impact cannot be alleviated, there is a problem that the cutting edges 4, 5, 12, 13 of the chips 3, 9 made of CBN, which are brittle materials, are likely to be chipped.

The present invention aims to solve the above problems.

[Means for Solving the Problems] In the end mill of the present invention, the tool body has a substantially columnar steel tip portion to which a CBN chip is fixed,
It is formed by a base end portion made of cemented carbide which is connected to the tip end portion and is gripped by the driving device.

[Operation] In the end mill having the above-described configuration, since the base end portion of the tool body has high rigidity, it is possible to prevent bending and chattering due to cutting resistance. In addition, since the tip part where the CBN chip is attached is excellent in elasticity, even if a cutting load is applied due to the intermittent cutting, the elastic deformation can reduce the impact. The chipping of the blade is prevented.

[Embodiment] FIG. 1 shows an end mill which is one embodiment of the rolling tool of the present invention, and the portions common to those shown in FIG. 3 and FIG. The description is omitted.

In FIG. 1, in this end mill 20, a tool main body 21 is made of a substantially cylindrical steel tip portion 22 to which the CBN chip 3 is fixed, and a cemented carbide alloy gripped by a drive unit. The base end portion (indicated by diagonal lines in the figure) 23 is formed. The tip end portion 22 and the base end portion 23 are integrally fixed (connected) by brazing.

According to the end mill 20 having the above configuration, even when the protruding amounts of the cutting edges 4 and 5 of the CBN chip 3 are large, the base end portion 23 of the tool body 21 is formed of cemented carbide, resulting in high rigidity. Since it is excellent, it does not bend and chatter due to cutting resistance.

Further, since the tip end portion 22 to which the CBN chip 3 is attached is made of steel having excellent elasticity, even if a cutting load is shocked by the intermittent cutting, the elastic deformation deforms the shock. Therefore, the cutting edges 4 and 5 of the CBN chip 3 are not chipped.

[Other Embodiments] FIG. 2 shows another example in which the rolling tool of the present invention is applied to an end mill.

Also in the end mill 30 of this example, the tool body 31 is
The tip 3 made of steel and having a substantially cylindrical shape, to which the chip 3 made of metal is fixed, and the base end portion (shown by diagonal lines in the figure) 33 made of cemented carbide that is held by the drive unit. . In the end mill 30, the tip end portion 32 and the base end portion 33 are detachably connected by a known mechanical connection mechanism 34.

In the end mill of this example, the same action and effect as those shown in FIG. 1 can be obtained, and furthermore, since the tip end portion 32 and the base end portion 33 are detachably connected, one end is worn. Alternatively, if it is damaged, only the relevant part needs to be replaced, which is economical.

In the above examples, brazing
The end mills 20 and 30 in which the CBN chip 3 is fixed to the tool bodies 21 and 31 have been described, but the present invention is not limited to this, and has a CBN chip 9 as shown in FIGS. 5 and 6, for example. The throwaway chip 10 may be applied to those fixed by a clamp piece.

Further, the tool to be applied is not limited to the end mills 20 and 30, and the same action and effect can be obtained even if it is used for other rolling tools such as a drill and a milling cutter.

[Advantage of Invention] As described above, according to the rolling tool of the present invention, since the base end portion of the tool body 21 is formed of cemented carbide having excellent rigidity, the bending of the entire tool due to cutting resistance is caused. The tool body can be pressed to prevent chattering and the tip part of the tool body is made of steel with excellent elasticity, so the impact generated on the cutting edge is mitigated by elastic deformation of the tip part to prevent cutting edge damage. , The cutting edge life can be extended.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment in which the rolling tool of the present invention is applied to an end mill, FIG. 2 is a front view showing another embodiment of the present invention, and FIGS. 3 and 4 are conventional end mills. FIG. 3 is a front view, FIG. 4 is a side view, FIGS. 5 and 6 are other conventional end mills, FIG. 5 is a front view, and FIG. 6 is a side view. Is. 3,9 …… CBN chip, 20,30 …… End mill (rolling tool), 21,31 …… Tool body, 22,32 …… Tip part, 23,33
...... The base part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 59-193631 (JP, U) Shown 60-109809 (JP, U) Shown 58-17916 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A rolling tool comprising a CBN chip, which is a cutting edge, fixed to the tip of a tool body having a substantially columnar shape. The tool body is fixed to the CBN chip. A rolling tool formed by a steel-made tip end portion having a substantially columnar shape and a cemented carbide base end portion connected to the tip end portion and gripped by a drive device.