JP2016155178A - Rotary tool and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool capable of forming a long hole or the like in a workpiece and efficiently processing a workpiece by a single rotary tool, and easily manufactured.SOLUTION: A rotary tool 10 rotates around a rotational axis R to process a workpiece. The rotary tool 10 has its tip angle set to 105° to 135°. The rotary tool 10 has four helical grooves 22 on its side face, and a cutting edge 26 is formed in one edge of each of the four side parts 24 held among the four helical grooves 22. In the cutting edges 26 formed in the four side parts 24, thinnings 32 are continuously formed on the tip sides of every other cutting edges 26, and chip discharge parts 34 are continuously formed on the tip sides of the remaining cutting edges 26.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary tool and a method for manufacturing a rotary tool.

  Conventionally, in order to form a long hole, square hole, round hole, polygonal hole, etc. in a work piece, a work piece is first drilled with a drill, and then an end mill is inserted into the formed hole. A hole is cut and widened by an end mill. In this processing method, since a drill and an end mill are used to form a long hole or the like, the rotary tool attached to the spindle or the like is changed during the work, or a plurality of spindles or the like are used. Need to do work. On the other hand, a rotating tool capable of continuously performing drilling and opening of holes has been proposed particularly when a thin plate having a thickness shorter than the tool diameter and the tool blade length is processed. When a plurality of machining operations can be performed using a single rotary tool as in the rotary tool described in Patent Document 1, the labor of replacing the rotary tool by the operator is eliminated, and the time required for the cutting process is reduced. Therefore, the cutting process can be easily considered.

JP 2005-153125 A

  The three-blade rotary tool described in Patent Document 1 can increase the rigidity by increasing the thickness of the core. However, since the groove between the blades for discharging the chips is small, the chips are easily clogged during drilling. In general, a drill having three bottom blades is difficult to perform thinning polishing, and it is difficult to manufacture a rotary tool with high accuracy.

  The present invention has been made in view of the above problems, and can form a long hole or the like in a workpiece by a single rotary tool, and can efficiently process the workpiece and easily manufacture it. It is an object to provide a rotating tool.

The rotary tool of the present invention is a rotary tool that rotates around a rotation axis to process a workpiece. This rotary tool has a tip angle of 105 ° to 135 °. Further, the rotating tool has four spiral grooves formed on the side surface, and a cutting blade is formed on one edge of each of the even number of side surfaces sandwiched between the four spiral grooves. The cutting blades formed on the four side surfaces are continuously thinned on the leading edge side of every other cutting blade, and the chip discharge portion is continuously formed on the leading edge side of the remaining cutting blades. ing.
According to such a rotary tool, the workpiece can be drilled by thinning formed at the tip portion, and the hole can be expanded by the cutting blade formed at the side surface. Moreover, since thinning and a chip | tip discharge | emission part are formed every other tip at the front-end | tip of a cutting blade, a perforation process can be performed efficiently.

Further, the side surface portion may be formed in an uneven shape with a wavefront perpendicular to the rotation axis of the rotary tool.
If it carries out like this, the cutting capability of a cutting blade can be improved.

The manufacturing method of the rotary tool of the present invention is a cylinder as a whole, and four spiral grooves are formed on the side surface, and a cutting edge is formed on one edge of each of the four side surfaces sandwiched between the four spiral grooves. Preparing the prepared member, and making the prepared member a tip angle of 105 ° to 135 °, and continuously to the tip side of every other cutting blade among the cutting blades formed on the four side surfaces. Forming thinning and continuously forming a chip discharge portion on the front end side of the remaining cutting blade.
According to this method of manufacturing a rotary tool, the above-described rotary tool according to the present invention can be easily manufactured.

It is a front view which shows the rotary tool of this embodiment. It is a side view which shows the rotary tool of this embodiment. It is the figure which looked at the rotary tool of this embodiment from the front end side. It is AA view seen from the AA direction in FIG. It is a figure which shows an example of the member for manufacturing a rotary tool.

  Hereinafter, a rotary tool according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a front view and a side view showing a rotary tool 10 according to an embodiment of the present invention, and FIG. 3 is a view showing the rotary tool 10 as viewed from the tip side. As shown in FIGS. 1-3, the rotary tool 10 is formed in the elongate column shape which makes the rotating shaft R an axis center as a whole. The rotary tool 10 is formed as a shank portion 12 while the rear end side (lower side in FIGS. 1 and 2) is cylindrical, and the front end side (upper side in FIGS. 1 and 2) is formed as a processing portion 14. ing.

  The shank portion 12 is held by a spindle that is rotationally driven by a driving source (not shown) such as a machining center, a milling machine, or an electric tool. Thereby, the rotary tool 10 rotates around the rotation axis R integrally with the spindle, and the workpiece 14 is machined by contacting the workpiece with the workpiece 14. As the spindle to which the rotary tool 10 is attached, a known configuration can be adopted, and any type may be used.

  The processing part 14 is continuously formed on the tip side of the shank part 12, and a blade for processing a workpiece is formed. In the present embodiment, the rotary tool 10 is formed as a right-twist left-turn tool. However, the rotary tool 10 may be formed as a left-handed and right-turned tool. The processing unit 14 includes an end mill unit 20 formed on the side surface of the rotary tool 10 and a drill unit 30 formed on the tip of the rotary tool 10.

  The end mill part 20 is continuously formed on the front end side of the shank part 12 and the rear end side of the drill part 30. In the end mill portion 20, four spiral grooves 22 are formed so that four cutting blades (outer peripheral blades) 26 are formed in a spiral shape. In other words, four spiral grooves 22 are formed in the end mill part 20, and four side surface parts (regions in which the spiral grooves 22 are not formed) 24 sandwiched between the four spiral grooves 22 are spirally formed. A cutting edge 26 is formed on one edge with the groove 22 (the right edge in FIGS. 1 and 2). FIG. 4 is an AA view seen from the AA direction in FIG. In FIG. 4, the cross section of the rotary tool 10 is hatched. As shown in FIG. 4, in the present embodiment, the four spiral grooves 22 are formed at equal intervals along the circumferential direction of the rotary tool 10. However, the spiral grooves 22 are not limited to those formed at equal intervals in the circumferential direction, and may have different sizes or different sizes.

  Each of the side surface parts 24 sandwiched between the spiral grooves 22 is formed in an uneven shape (unevenness 25) including the cutting edge 26. The unevenness 25 is formed in a waveform that is a wavefront perpendicular to the rotation axis R. In other words, the unevenness 25 is formed in a wave shape in which the traveling direction of the wave is along the rotation axis R. Thus, by forming the unevenness 25 on the side surface portion 24 and the cutting edge 26, the processing capability of the end mill portion 20 can be improved.

  The drill part 30 is formed continuously at the tip of the end mill part 20. The drill part 30 is formed in a shape with a sharp tip. The tip angle A of the drill unit 30 is such that when the workpiece is drilled by the drill unit 30, the force applied to the drill unit 30 from the workpiece or the like is in the direction of the rotation axis R and the direction perpendicular to the direction of the rotation axis R. It is preferable that the angles are substantially equal. Specifically, the tip angle of the drill portion 30 is preferably 105 ° to 135 °, more preferably 105 ° to 120 °, and still more preferably 118 °. In the present embodiment, the tip angle A of the drill part 30 is about 105 °.

  In the drill part 30, a thinning (bottom edge) 32 for drilling is formed continuously from the cutting edge 26 of the end mill part 20. As shown in FIG. 3, two thinnings 32 are formed in succession to two cutting blades 26 that are every other one of the four cutting blades 26 of the end mill portion 20. That is, the thinning 32 is formed every 180 degrees. The thinning 32 is preferably an X-shaped thinning surface as shown in FIG. 3, but may have a shape other than the X shape, such as an S shape, an XS shape, or a notch shape. A flank 33 is formed on the rear side of the thinning 32 in the rotational direction (clockwise in FIG. 3).

  On the tip end side of the remaining cutting edge 26 of the end mill portion 20, an inclined portion (chip discharge portion) 34 for discharging chips associated with the drilling process is formed. That is, in the drill portion 30, the thinning 32 is continuously formed on every other cutting edge 26 of the four cutting edges 26 of the end mill portion 20, and the chip discharging portion 34 is continuously formed on the remaining tip side. ing. Here, the chip discharge part 34 continues to the rake face of the adjacent thinning 32, the edge of the thinning 32 stands out, and the chip scraped by the thinning 32 is on the end mill part 30 side (lower side in FIG. 1). In order to discharge properly, it is formed by being cut out in an inclined shape. The rear end side (lower side in FIG. 1) of the chip discharge portion 34 is continuous with the cutting edge 26 and the spiral groove 22 of the end mill portion 30.

  When manufacturing the rotary tool 10 according to the present embodiment, as an example, first, a member 40 as shown in FIG. 5 is prepared. In FIG. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals. As shown in FIG. 5, the member 40 is formed so that the end mill portion 20 is continuous to the tip side (upper side in FIG. 5). As the member 40, for example, a known end mill in which four cutting edges are formed on the side surface can be used. In addition, the end mill part 20 (cutting blade 26) does not need to be formed to the front end of the member 40. For example, the front end part that becomes the drill part 30 may have a cylindrical shape without the cutting edge 26 or the like being formed. Good.

  And the front end side is processed with respect to the prepared member 40, and it is set as the front-end | tip angle of 105 degrees-135 degrees, and it continues to the cutting blade 26 of every other front end side among the four cutting blades 26. A thinning 32 is formed, and a chip discharge portion 34 is formed continuously with the remaining cutting edge 26 on the front end side. At this time, since the thinning 32 may be formed every 180 degrees, thinning polishing can be easily performed, and the thinning 32 continuous with the cutting edge 26 can be formed with high accuracy. Further, the remaining cutting blade (cutting blade in which the thinning 32 is not continuous) 26 is shaved on the tip side of the cutting blade 26 so that chips (chips) are suitably excluded in the drilling process, and a chip discharge portion (pocket). 34 is formed. Thus, by preparing the member 40 and forming the rotary tool 10, the rotary tool 10 concerning this embodiment can be manufactured easily. Such a manufacturing method of the rotary tool 10 can be applied even when the tip of the rotary tool 10 is damaged due to wear or the like. The thinning 32 and the chip discharge portion 34 are re-polished as long as the cutting edge 26 is as long as possible. The rotary tool 10 can be used.

  Here, as a comparative example with the rotary tool 10 of the present embodiment, a radius end mill whose end mill has a rounded tip is moved with a certain degree of inclination (for example, 40 degrees) with respect to the rotation axis. You can also However, the radius end mill cannot perform drilling along the rotation axis direction, and the object to be processed is limited. On the other hand, since the rotary tool 10 of this embodiment has the drill part 30 in which the thinning 32 was formed, the drilling process along the rotation-axis R direction is possible, and it drills in various process target (workpiece | work). Processing and hole expansion processing can be performed. And the drill part 30 in which the thinning 32 was formed is a shape completely different from the front-end | tip part of a radius end mill, and durability of the blade of a front-end | tip is remarkably improved compared with a radius end mill. In addition, it is preferable that the rotary tool 10 of this embodiment is used for the workpiece | work whose thickness is below a rotary tool diameter.

  In general, as the number of bottom blades increases, the thickness of the drill can be increased by increasing the thickness of the core, but the groove between the blades for discharging the chips becomes smaller and the chips are more easily clogged during drilling. . On the other hand, since the two thinnings 32 and the chip discharge | emission part 34 (pocket) are formed in the drill part 30, the rotary tool 10 of this embodiment can implement | achieve high drilling capability.

  In the rotary tool 10 of the present embodiment described above, the tip angle of the drill part 30 is formed to be about 105 °, the four spiral grooves 22 are formed on the side surface of the end mill part 20, and the four cutting edges 26 are formed. Yes. A thinning 32 is continuously formed on every other cutting edge 26 of the four cutting edges 26, and a chip discharge portion 34 is formed continuously on the leading edge side of the remaining cutting edges 26. Thereby, while using the single rotary tool 10, a drilling process can be performed by the drill part 30, and a hole expanding process can be performed by the end mill part 20. Moreover, since the thinning 32 and the chip | tip discharge | emission part 34 are formed in the drill part 30 every other cutting blade 26, the discharge | emission of the chip | tip accompanying a process can be performed suitably and drilling can be performed efficiently. it can. And since the four cutting blades 26 are formed in the end mill part 20, a hole expansion process can be performed with high processing capability.

  Further, in the rotary tool 10 of the present embodiment, since the drill part 30 is formed in a two-blade having two thinnings 32, thinning polishing for forming the thinnings 32 can be easily performed with high accuracy. . By forming the thinning 32 in the drill portion 30, it is possible to reduce the thrust value at the time of machining using the rotary tool 10 and reduce the wear and chipping of the tip, and to improve the durability of the rotary tool 10. it can. In addition, the rotary tool 10 of the present embodiment prepares a member 40 in which four spiral grooves 22 are formed and four cutting blades 26 are formed. The thinning 32 is continuously formed on the distal end side of the stationary cutting blade, and the chip discharging portion 34 is continuously formed on the distal end side of the remaining cutting blade, so that it can be easily manufactured.

  In the above embodiment, the side surface 24 of the rotary tool 10 is provided with the wavefront irregularities 25 perpendicular to the rotation axis R. However, the wavefront irregularities inclined with respect to the rotation axis R are formed. May be. Further, the waveform may be a sine wave shape, or may be formed in an uneven shape such as a rectangular wave shape or a triangular wave shape. Further, only a part of the side surface portion 24 may be formed in an uneven shape, and the side surface portion 24 and the cutting edge 26 may not be uneven.

  Although the embodiments of the present invention have been described above, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. In addition, any combination of the embodiment and the modified example is possible within a range where at least a part of the above-described problems can be solved or a range where at least a part of the effect can be achieved, and is described in the claims and the specification. Any combination or omission of each component is possible.

DESCRIPTION OF SYMBOLS 10 Rotating tool 12 Shank part 14 Processing part 20 End mill part 22 Spiral groove 24 Side face part 25 Concavity and convexity 26 Cutting edge 30 Drill part 32 Thinning 34 Chip discharge part 40 Member

Claims (3)

A rotary tool that rotates around a rotation axis to process a workpiece,
The tip angle is 105 ° to 135 °,
Four spiral grooves are formed on the side,
A cutting blade is formed on one edge of each of the four side surfaces sandwiched between the four spiral grooves,
The cutting blades formed on the four side surfaces are formed with thinning continuously on the tip side of every other cutting blade, and a chip discharge portion is formed continuously on the tip side of the remaining cutting blades. Yes,
Rotary tool. The rotary tool according to claim 1,
The side surface portion is formed in an uneven shape of a wavefront perpendicular to the rotation axis.
Rotary tool. A method for producing the rotary tool according to claim 1,
A step of preparing a member that is a cylinder as a whole, has four spiral grooves formed on a side surface, and each of four side surfaces sandwiched between the four spiral grooves has a cutting edge on one edge;
The prepared member has a tip angle of 105 ° to 135 °, and a thinning is continuously formed on the tip side of every other cutting blade among the four cutting blades formed on the four side surfaces, Forming a chip discharge part continuously on the tip side of the cutting blade; and
The manufacturing method of the rotary tool containing this.

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