JP5675524B2 - Cutting tool - Google Patents

Description

  The present invention relates to a cutting tool for performing cutting.

  Conventionally, as a cutting tool, for example, it is used when finishing a hole formed in a workpiece, and after being inserted into the hole, the cutting edge provided in the blade portion is used to insert the inner part in the hole. Reamers that cut wall surfaces are known.

  In such a reamer, as disclosed in Patent Document 1, one having two or more cutting edges along the axial direction is known, and the first cutting edge portion provided on the tip side has a hole. Then, the hole is cut by a second cutting edge portion which is provided on the rear end side of the first cutting edge portion and has a diameter larger than that of the first cutting edge portion, thereby expanding the diameter. That is, a plurality of cutting blade portions are provided in a stepped shape from the front end of the reamer toward the rear end side.

JP 2004-195572 A

  In the cutting tool having the stepped cutting edge as described above, the chips discharged when cutting with the first cutting edge at the tip are formed in a spiral shape along the axial direction. Although it is discharged to the rear end side along the discharge groove, the chip is discharged to the rear end side because the discharge groove of the second cutting edge portion communicates with the discharge groove of the first cutting edge portion. As a result, there is a problem that when the cutting is performed with the second cutting edge portion, it remains between the inner wall surface of the hole and the processing accuracy of the hole by the second cutting edge portion is lowered.

  The present invention has been made in consideration of the above problems, and even in a configuration having a plurality of cutting blade portions along the axial direction, cutting is not affected by the chips generated at the blade portion on the distal end side. An object of the present invention is to provide a cutting tool that can be performed with high accuracy and can improve machining accuracy.

In order to achieve the above object, the present invention provides a cutting tool that has two or more reamer blades along the axial direction of the body and performs cutting with the reamer blades.
A drill blade provided at the tip of the body;
A drill discharge groove for discharging chips cut by the drill blade;
A first reamer blade provided on the tip side of the body;
A second reamer blade provided on the base end side of the first reamer blade in the body;
A first reamer discharge groove for discharging chips cut by the first reamer blade;
A second reamer discharge groove for discharging chips cut by the second reamer blade;
With
The first reamer discharge groove and the drill discharge groove are formed so as to be separated from each other by a predetermined angle along the circumferential direction of the body on the distal end side of the body, and the first reamer discharge groove formed in a spiral shape, respectively. grooves and the drill flutes approaches gradually toward the base end side of said body, said first merges with the drill flute in the base end side of the reamer discharge groove integrally connected with Rutotomoni, the second reamer discharge groove, characterized in that it is formed independently without merging with respect to each of the first reamer discharge groove and the drill flutes.

  According to the present invention, a drill blade and a first reamer blade are provided at the distal end portion of the body, and a second reamer blade is provided at the proximal end side of the first reamer blade, and cutting is performed with the first reamer blade. The first reamer discharge groove for discharging the cut chips is communicated with the drill discharge groove for discharging the chips cut by the drill blade. The second reamer discharge groove for discharging chips cut by the second reamer blade is not in communication with the first reamer discharge groove and the drill discharge groove.

  Therefore, chips discharged when a hole such as a workpiece is cut with the first reamer blade is discharged from the first reamer discharge groove to the drill discharge groove and does not move to the second reamer discharge groove. Therefore, the chips discharged by the first reamer blade are reliably prevented from being discharged to the second reamer blade side provided on the base end side of the first reamer blade, and the second reamer When cutting a hole with a blade, it is avoided that chips discharged through the first reamer discharge groove enter. As a result, the hole can be cut with high accuracy by the second reamer blade, and the machining accuracy can be improved.

  Further, the first reamer blade is set so that the torsion angle gradually changes from the front end of the body toward the base end side, and the torsion angle of the drill blade is set to be constant along the axial direction of the body. Good.

  According to the present invention, the following effects can be obtained.

  That is, the first reamer discharge groove for discharging chips cut by the first reamer blade communicates with the drill discharge groove for discharging chips cut by the drill blade, and the chips cut by the second reamer blade Chips discharged when a hole such as a workpiece is cut with the first reamer blade by disabling the second reamer discharge groove that discharges the first reamer discharge groove and the drill discharge groove. Can be discharged from the first reamer discharge groove to the drill discharge groove, so that the chips are reliably prevented from being discharged to the second reamer blade side. As a result, the hole can be cut with high accuracy by the second reamer blade, and accordingly, the processing accuracy can be improved.

It is a principal part perspective view of the tool for cutting which concerns on embodiment of this invention. 2A is a sectional view taken along line IIA-IIA in FIG. 1, FIG. 2B is a sectional view taken along line IIB-IIB in FIG. 1, and FIG. 2C is taken along line IIC-IIC in FIG. 2D is a cross-sectional view taken along the line IID-IID in FIG. 1.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a cutting tool according to the present invention will be given and described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a main part of a drill reamer 10 as a cutting tool according to the present invention.

  As shown in FIGS. 1 and 2, the drill reamer 10 includes a drill portion 14 (see FIGS. 2A to 2C) formed at the tip (in the direction of arrow A) of the body 12 having a shank, and the drill portion 14. On the other hand, it includes a reamer portion 16 (see FIG. 2D) formed on the base end side (arrow B direction).

As shown in FIGS. 2A to 2C, the drill portion 14 includes two drill blade portions (drill blades) 18 a and 18 c that are separated from each other by about 180 ° in the circumferential direction, and one drill blade portion 18 a. and between the other drill blade portion 18 c, the drill flutes 20a Nijo recessed radially inwardly of the body 12, 20b is formed. Helix angle of the drill bit 18a, 18 c, for example, while being set to 15 °, the drill bit 18a, 18 c and drill flutes 20a, 20b, the axial of the body 12 (arrow A, B direction ) Spirally extending along.

The reamer unit 16 includes two first reamer blades (first reamer blades) 22a and 22b that are separated from each other by about 180 ° in the circumferential direction of the body 12, and proximal ends of the first reamer blades 22a and 22b. It includes two second reamer blade portions (second reamer blades) 24a and 24b that are formed and have a larger diameter than the first reamer blade portions 22a and 22b. The first reamer blade portion 22a, 22b are formed to protrude radially outwardly relative to the drill bit 18a, 18 c, and is formed in approximately 45 ° spaced locations along the circumferential direction of the body 12.

  Further, first reamer discharge grooves 26a and 26b are formed between one first reamer blade portion 22a and the other first reamer blade portion 22b, respectively. The first reamer discharge grooves 26a and 26b extend in a spiral shape along the axial direction of the body 12 (directions of arrows A and B).

The first reamer blade portion 22a, the helix angle of 22b, for example, while being set in the same manner as 15 ° with the first drill bit 18a, 18 c at the tip of the body 12, the base end side (arrow B direction) The angle gradually increases and is set to 35 ° on the base end side (in the direction of arrow B). That is, the first reamer blade portions 22a and 22b are set so that the torsion angle increases so as to gradually approach the drill blade portions 18a and 18c toward the base end side (arrow B direction). blade portion 18a, 18 c and the first reamer blade portion 22a, the first reamer discharge groove 26a at the base end side of 22b (arrow B direction), 26b merge drill flute 20a, 20b and.

  As shown in FIG. 1 and FIG. 2D, the second reamer blade portions 24a and 24b are provided at a distance of about 180 ° in the circumferential direction, like the first reamer blade portions 22a and 22b. Second reamer discharge grooves 28a and 28b are formed between the two reamer blade portions 24a and the other second reamer blade portion 24b, respectively. The second reamer discharge grooves 28a and 28b extend spirally along the axial direction (arrows A and B directions), and communicate with the first reamer discharge grooves 26a and 26b and the drill discharge grooves 20a and 20b. There is no.

  In other words, the base end side (arrow B direction) ends of the first reamer discharge grooves 26a and 26b and the drill discharge grooves 20a and 20b are on the tip end side (arrow A direction) of the second reamer discharge grooves 28a and 28b. The end portion and the body 12 are arranged so as to be offset by a predetermined angle in the circumferential direction.

  The drill reamer 10 as a cutting tool according to an embodiment of the present invention is basically configured as described above. Next, a case where a hole is cut in a workpiece or the like will be described.

  First, after holding the body 12 of the drill reamer 10 on a rotary holder of a cutting apparatus (not shown), the drill reamer 10 is rotated by rotating the rotary holder.

Next, move the Dorirurima 10 from the distal end (direction of arrow A) so as to be substantially perpendicular toward the workpiece, the hole of a predetermined diameter is formed by the drill bit 18a, 18 c abuts on the workpiece. In the workpiece, chips generated as the inner wall surface of the hole is cut are discharged along the drill discharge grooves 20a and 20b toward the base end (in the direction of arrow B).

Also, the hole formed by the drill bit 18a, 18 c, said drill bit 18a, 18 first reamer blade portion 22a projecting radially outwardly relative to c, the inner wall surface by 22b is desired diameter, and Further, cutting is performed so as to obtain surface roughness, and chips generated by the cutting are discharged along the first reamer discharge grooves 26a and 26b to the base end side (in the direction of arrow B). Then, the chips discharged through the first reamer discharge grooves 26a and 26b merge into the drill discharge grooves 20a and 20b and are discharged to the outside of the holes.

  At this time, since the end portions of the first reamer discharge grooves 26a and 26b and the drill discharge grooves 20a and 20b do not communicate with the second reamer discharge grooves 28a and 28b, the chips are not connected to the second reamer discharge grooves 28a and 28b. There is no entry into.

  Further, by inserting the drill reamer 10 into the hole by a cutting device, the second reamer blade portions 24a and 24b cut the large-diameter hole whose diameter is larger than that of the hole. The large-diameter hole is formed coaxially with the hole and has a larger diameter than the hole.

  At this time, the chips discharged along with the cutting of the inner wall surface of the large-diameter hole move to the base end side (in the direction of arrow B) through the second reamer discharge grooves 28a and 28b, and to the outside of the large-diameter hole. Discharged.

As described above, in this embodiment, the distal end of the body 12 constituting the Dorirurima 10, drill bit 18a, 18 c and the first reamer blade portion 22a, and 22b provided, the drill bit 18a, 18 c Drill discharge grooves 20a, 20b from which chips are discharged when cutting is performed, and first reamer discharge grooves 26a, 26b from which chips are discharged when cutting is performed by the first reamer blade portions 22a, 22b, and Are joined at the base end side (in the direction of arrow B) of the body 12. On the other hand, the second reamer discharge grooves 28a, 28b are formed so as not to communicate with the drill discharge grooves 20a, 20b and the first reamer discharge grooves 26a, 26b.

  Thereby, the chips discharged during the cutting of the first reamer blade portions 22a and 22b are discharged from the first reamer discharge grooves 26a and 26b to the drill discharge grooves 20a and 20b, and to the second reamer discharge grooves 28a and 28b. Since it does not move, it is possible to reliably prevent discharge to the second reamer blade portions 24a, 24b provided on the base end sides (arrow B direction) of the first reamer blade portions 22a, 22b. It becomes possible.

  As a result, when the inner wall surface of the hole is cut by the second reamer blade portions 24a, 24b, it is avoided that chips discharged through the first reamer discharge grooves 26a, 26b enter, and the second reamer blade The inner wall surfaces can be cut with high accuracy by the portions 24a and 24b. That is, the inner wall surface of the hole can be cut with a desired surface roughness.

  In addition, the cutting tool according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

10 ... Dorirurima 12 ... body 14 ... drill part 16 ... reamer section 18a, 18 c ... drill bit 20a, 20b ... drill flutes 22a, 22b ... first reamer blade portion 24a, 24b ... second reamer blade portion 26a, 26b ... 1st reamer discharge groove 28a, 28b ... 2nd reamer discharge groove

Claims (2)

In a cutting tool having two or more reamer blades along the axial direction of the body and performing cutting with the reamer blades,
A drill blade provided at the tip of the body;
A drill discharge groove for discharging chips cut by the drill blade;
A first reamer blade provided on the tip side of the body;
A second reamer blade provided on the base end side of the first reamer blade in the body;
A first reamer discharge groove for discharging chips cut by the first reamer blade;
A second reamer discharge groove for discharging chips cut by the second reamer blade;
With
The first reamer discharge groove and the drill discharge groove are formed so as to be separated from each other by a predetermined angle along the circumferential direction of the body on the distal end side of the body, and the first reamer discharge groove formed in a spiral shape, respectively. grooves and the drill flutes approaches gradually toward the base end side of said body, said first merges with the drill flute in the base end side of the reamer discharge groove integrally connected with Rutotomoni, the second reamer flute is, the first reamer discharge groove and cutting tool, characterized in that it is formed independently without merging for each of the drill flutes. The cutting tool according to claim 1,
The first reamer blade is set such that a torsion angle gradually changes from the distal end of the body toward the proximal end side, and the torsion angle of the drill blade is set to be constant along the axial direction of the body. A cutting tool characterized by being made.

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