JPH0551511U - Bowling bar - Google Patents

Abstract

(57) [Abstract] [Purpose] A holder with a specified outer diameter does not have insufficient strength, and a cutting oil passage can be sufficiently supplied to the cutting edge of the insert, and chips do not wrap around. The purpose is to provide a bowling bar. [Structure] A spiral groove extending from the tip to the rear is engraved on the outer circumference of the holder, a chip is attached to one groove surface of the spiral groove tip, a cutting oil passage is provided in the axial direction of the holder, and the other groove near the chip is provided. The boring bar is formed by opening a supply port of a cutting oil passage toward the cutting edge portion of the chip on the surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bowling bar.

[0002]

[Prior Art]

 The boring bar is used for boring, and cutting oil is supplied to the cutting edge of the insert. As shown in FIGS. 7 and 8, a conventional boring bar is supplied with cutting oil by forming a mounting plane 102 at the tip of a holder 101, providing a tip 103 on the mounting plane 102, and arranging a tip 103 at the end of the mounting plane 102. The supply port 105 of the cutting oil passage 104 formed in the axial portion of the holder 101 is opened on the wall surface to be formed, and is directed toward the cutting edge portion 106 of the tip 103 to supply the cutting oil.

Further, as shown in FIG. 9, a mounting plane 202 is formed at the tip of the holder 201, a chip 203 is provided on the mounting plane 202, and an axial portion of the holder 201 is attached to a wall surface formed at the end side of the mounting plane 202. The supply port 205 of the cutting oil passage 204 formed in the opening is opened, and a nozzle 207 is projectingly provided on the supply port 205 so as to face the cutting edge portion 206 of the tip 203 to supply the cutting oil.

[0004]

[Problems to be solved by the device]

 In any conventional boring bar, since the mounting planes 102 and 202 are formed at the tips of the holders 101 and 201 in any case, the cross-sectional area of the tips of the holders 101 and 201 is small, and the length is considerably long. Since the chips 103 and 203 are projected and the tips 103 and 203 are attached to the tips thereof, the strength tends to be insufficient, and in order to obtain sufficient strength, it was necessary to use holders 101 and 201 having a considerably large diameter.

Further, in the boring bar shown in FIG. 9, since the nozzle 207 is projectingly provided on the wall surface, there is a problem that chips are wrapped around.

[0006]

[Means for Solving the Problems]

 Therefore, in view of the above circumstances, the present invention is capable of sufficiently supplying cutting oil to the cutting edge portion of the tip without insufficient strength with a holder having a predetermined outer diameter, and moreover, such that chips are wrapped around. In order to provide a unique boring bar, a spiral groove extending from the tip to the rear is engraved on the outer periphery of the holder, a chip is attached to one groove surface of the tip of the spiral groove, and a cutting oil passage is provided in the axial direction of the holder. The cutting oil passage is provided on the other groove surface in the vicinity of the tip and opens toward the cutting edge portion of the tip.

[0007]

[Action]

 The cutting oil jetted from the supply port of the cutting oil passage is supplied to the cutting edge portion of the tip. The chip is attached to one groove surface of the spiral groove, and the supply port for the cutting oil passage is provided on the other groove surface, so that the strength of the holder is not insufficient and the chips are not wrapped around.

[0008]

【Example】

 The present invention will be described in detail below based on a specific embodiment shown in the accompanying drawings. As shown in FIGS. 1 and 2, a spiral groove 2 is formed on the outer circumference of the holder 1 for discharging chips from the tip toward the rear. The chip 4 can be attached to one groove surface 3 of the spiral groove 2. Further, the cutting oil passage 5 is provided in the axial direction of the holder 1. The supply port 8 of the cutting oil passage 5 toward the cutting edge portion 7 of the chip 3 is opened in the other groove surface 6 in the vicinity of the chip 4, and the injection direction of the supply port 8 is determined as follows.

The cutting oil jetted from the supply port 8 sets the orientation of the cutting oil passage 9 on the supply port 8 side so as to be directed to the cutting edge portion 7 of the tip 4. The plane inclination angle θ ₁ that is the inclination in the plane direction of the cutting oil passage 9 on the supply port 8 side is shown in FIG. 2, and the front inclination angle that is the inclination in the front direction of the cutting oil passage 9 on the supply port 8 side. θ ₂ is illustrated as in FIG.

By setting the plane inclination angle θ ₁ to 0 to 45 ° and the front inclination angle θ ₂ to 0 to 45 °, it is possible to enhance the chip discharging effect and the cooling effect. That is, when the front inclination angle θ ₁ is smaller than 0 °, it is impossible to secure the cutting oil passage 9. When the plane inclination angle θ ₁ is 0 to 45 °, as shown in FIG. 4, the cutting oil is formed on the cutting end face 12 of the work material 11 and on the step formed by the cutting face 13 as shown by an arrow A. Since the reflection direction is closer to the inlet side of the work material 11 than the cutting edge portion 7, chips are not caught in the cutting edge portion 7.

When the plane inclination angle θ ₁ is larger than 45 °, the cutting oil is reflected by the cutting end surface 12 and the cutting surface 13 of the work material 11 as shown by an arrow B as shown in FIG. However, since the reflection direction is on the far side of the work material 11 from the cutting edge portion 7, the chips are pushed further inward by the cutting oil, the chip discharge performance is poor, and the chips are caught in the cutting edge portion 7. It is easy to get crowded.

Further, as shown in FIG. 6, cutting oil is injected from the supply port 8 to the cutting edge portion 7 as shown by an arrow C. If the front inclination angle θ ₂ is smaller than 0 °, it is impossible to secure the cutting oil passage 9. Even if the front inclination angle θ ₂ is larger than 45 °, it is impossible to secure the cutting oil passage 9.

[0013]

[Effect of the device]

 According to the present invention, a spiral groove extending from the tip to the rear is engraved on the outer circumference of the holder, a chip is attached to one groove surface at the tip of the spiral groove, a cutting oil passage is provided in the axial direction of the holder, and a groove near the tip is provided. Since it is a boring bar that opens the supply port of the cutting oil path toward the cutting edge of the tip on the other groove surface, the holder with the specified outer diameter does not lack strength and is therefore highly accurate without being deformed during cutting. Can be cut into

Further, sufficient cutting oil can be supplied to the cutting edge portion of the tip, and moreover, chips do not wrap around. Further, in the present invention, the direction of the cutting oil passage on the supply port side is set to a plane inclination angle of 0 to 45 ° and a front inclination angle of 0 to 45 ° to enhance the chip discharging effect and the cooling effect. Can also be increased.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a main part of a boring bar according to a specific embodiment of the present invention.

FIG. 2 is a plan view of a specific embodiment of the present invention.

FIG. 3 is a front view of a specific embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing the flow of the cutting oil passage when the plane inclination angle is 0 to 45 ° in the present invention.

FIG. 5 is a vertical cross-sectional view showing the flow of the cutting oil passage when the plane inclination angle is larger than 45 °.

FIG. 6 is a front view showing the flow of the cutting oil 6 when the front inclination angle is 0 to 45 ° in the present invention.

FIG. 7 is a plan view of a conventional boring bar.

FIG. 8 is a side view of FIG.

FIG. 9 is a vertical cross-sectional view of another conventional boring bar.

[Explanation of symbols]

 1 ... Holder 2 ... Spiral groove 3 ... One groove surface 5 ... Cutting oil passage 4 ... Tip 6 ... Other groove surface 7 ... Cutting edge portion 8 ... Supply port 9 ... Supply port side cutting oil passage

Claims (1)

[Scope of utility model registration request] 1. A holder is provided with a spiral groove extending from the tip toward the rear, a tip is attached to one groove surface of the tip of the spiral groove, a cutting oil passage is provided in the axial direction of the holder, and the other is provided near the tip. Boring bar with a supply port of the cutting oil path toward the cutting edge of the chip opened in the groove surface.