JPH0731206U - Boring bar with oil hole - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively cool and lubricate the cutting edge of a cutting tool. A rear end portion of a shaft portion 3 provided with a cutting tool 2 at a tip end thereof is provided with a fitting portion 4 which is fitted to a main spindle end of a machine via a shank or the like, and the fitting portion 4 is fitted to the shaft portion 3. A boring bar 1 having an oil hole 5 communicating from the end 4A to the cutting tool 2 side of the tip, and a sphere 7 having an oil injection hole 8 in the tip opening 5 of the oil hole 5 is rotatable. Then, a rod-shaped turning tool is inserted into the injection hole 8 and the spherical body 7 is inserted.
Is forced to rotate so that the oil injection direction can be changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boring bar with an oil hole for boring cutting with a machine tool.

[0002]

[Prior art]

 Conventionally, in boring processing with a machine tool, that is, in boring processing in which a hole already drilled in a workpiece is cut into a desired size with a cutting tool, as shown in FIG. A boring bar 1 having a fitting portion 4 on which a shank 12 or a spacer or the like is mounted is used at a rear end portion of a shaft portion 3 having a cutting tool 11 detachably mounted.

The shaft portion 3 of the boring bar 1 is provided with an oil hole 5 communicating from the end of the fitting portion 4 to the cutting bite 11 side of the tip end, and an oil supply passage 5 ′ provided in the shank 12 is provided. The oil hole 5 is communicated with the oil hole 5, and oil (cutting oil) is injected from the tip opening of the oil hole 5 toward the cutting bit 11 (see, for example, Japanese Utility Model Publication No. 2-26604).

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned prior art, since the oil hole opening provided at the tip of the boring bar 1 is oriented in a fixed direction, when the boring diameter changes and the tip position of the cutting bit 11 fluctuates, the cutting bit 11 No oil is sprayed on the tip of the blade, and the blade edge cannot be cooled and lubricated effectively. Therefore, there is a problem that the service life of the cutting tool 11 cannot be extended and the finished surface for boring cannot be improved.

The present invention has been made in view of the above problems, and an object thereof is to provide a boring bar with an oil hole, which can effectively cool and lubricate the cutting edge of a cutting tool. To provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following technical means. That is, the present invention relates to a boring bar having a fitting portion, which is fitted to a main shaft end of a machine via a shank or the like, at a rear end portion of a shaft portion having a cutting tool at the tip portion thereof, Is provided with an oil hole communicating from the end of the fitting portion to the cutting tool blade edge side of the middle portion or the tip portion, and a spherical body having an oil injection hole is rotatably fitted in the tip end opening of the oil hole. Is characterized by.

[0007]

[Action]

 According to the present invention, in order to ensure that the oil hits the cutting edge of the cutting tool adjusted according to the boring diameter of the workpiece, oil injection of a spherical body fitted to the opening of the oil hole tip is performed. By inserting a rod into the hole and forcibly rotating the sphere, the direction of the oil injection hole (injection direction) can be freely changed. Therefore, even if there is a large difference in the size of the boring diameter, it is possible to adjust the direction of the oil injection hole easily and appropriately.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, in which a boring bar 1 is made of steel, and a shank having a cutting tool 2 obliquely with respect to a shaft core at a tip end thereof has a reduced diameter at a rear end part thereof. The fitting portion 4 is attached to the main shaft end (not shown) of the machine via a shank (see reference numeral 12 in FIG. 7) or the like.

Then, an oil hole 5 having an opening 5A on the mounting surface 3A of the cutting tool 2, that is, on the cutting edge side is provided in a penetrating manner on the shaft core portion of the shaft portion 3 from the rear end surface 4A of the fitting portion 4 through the intermediate portion. The diameter of the opening 5A is enlarged, and the spherical body 7 is rotatably fitted through the sleeve 6. An oil injection hole 8 is provided in the spherical body 7 in a penetrating manner, and by inserting the rod-shaped turning tool 9 shown in FIG. The direction of the injection hole 8 can be freely changed by freely rotating.

Further, on the outer periphery of the shaft fitting portion 4, there is provided a fixing tool fitting locking taper hole 10 for fixing the boring bar 1 to a shank or the like. The cutting tool 2 is a conventionally known one, and comprises a cartridge 12 having a cutting tool (throwaway tip) 11 attached to the tip thereof in a replaceable manner, a dial ring 13, a holding ring 14, etc., and a fixing screw. The cartridge 12 is fixed to the shaft portion 3 by 15. Then, the diameter of the boring hole is changed by loosening the fixing screw 15 and rotating the dial ring 13 to move the cartridge 12 in the direction shown by the arrow (a) in FIG. .

In the above-described first embodiment, when the position of the cutting edge 11A is changed by the withdrawal of the cutting tool 11, the tip of the rotating tool 9 shown in FIG. 3 is inserted into the oil injection hole 8 of the spherical body 7. 3, the sphere 7 is rotated in the directions indicated by arrows (b) and (c) in FIG. 3, and the direction of the oil injection hole 8 (injection direction) is directed toward the blade tip portion 11A and jetted from the injection hole 8. By making sure that the oil flow hits the cutting edge 11A, the cutting edge 11A of the cutting bit 11 is effectively cooled and well lubricated to finish the cutting surface accurately and cleanly. The life of the cutting tool 11 can be extended.

FIG. 4 shows a second embodiment of the present invention, which is different from the first embodiment in that a cutting tool mounting surface 3A parallel to the shaft center is formed at the tip of the shaft portion 3 of the boring bar 1. An oil hole opening 5A is provided on the curved surface 3B (that is, on the cutting edge side) following this, and the same effect as that of the first embodiment is obtained. Therefore, the same reference numerals as those in FIG. 1 are given and detailed description thereof is omitted.

FIG. 5 and FIG. 6 show a third embodiment of the present invention, which is different from the first embodiment in that the boring bar 1 is composed of a bar body 1A and a head 1B, and the bar body shaft center and the head shaft are arranged. The axis of the part 3 is collinear, the cutting tool 11 is provided at the tip of the bar body 1A, the bar body 1A is movable in the radial direction with respect to the head 1B, and the dial ring 13 is attached to the shaft part 3 of the head 1B. The head 1B and the shaft portion 3 have the same structure because they are mounted.

The third embodiment is suitable for boring holes having a relatively small diameter (φ3 to 50 mm), and can expect the same effects as the first embodiment. Therefore, the same structures as those in the first embodiment are designated by the same reference numerals as those in FIG. The present invention is not limited to the above-mentioned embodiment, and the design can be changed appropriately.

[0015]

[Effect of device]

 As described above, the present invention provides a boring bar having a fitting portion that is fitted to the main spindle end of a machine via a shank or the like at the rear end portion of a shaft portion having a cutting tool at the tip end thereof, An oil hole is provided on the shaft portion from the end of the fitting portion to the cutting tool cutting edge side of the middle portion or the tip portion, and a spherical body having an oil injection hole is rotatably fitted to the tip end opening of the oil hole. Therefore, it is possible to supply oil to the blade edge accurately according to the moving position of the blade edge due to the change of the boring diameter, and to cool and lubricate the blade edge effectively. It is possible to improve the durability of the cutting tool and the accuracy of boring finish.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a view showing an arrow A in FIG.

FIG. 3 is an enlarged view of part B in FIG.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a partially cutaway front view showing a third embodiment of the present invention.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is a front view showing a conventional example.

[Explanation of symbols]

 1 Boring Bar 2 Cutting Tool 3 Shaft Part 4 Fitting Part 4A Fitting Part End 5 Oil Hole 5A Tip Opening 7 Sphere 8 Oil Injection Hole 11 Cutting Bit 11A Cutting Edge Part

Claims (1)

[Scope of utility model registration request] 1. A boring bar having a fitting portion, which is fitted to a main spindle end of a machine via a shank or the like, at a rear end portion of a shaft portion having a cutting tool at a front end portion thereof, wherein An oil hole communicating from the end of the fitting portion to the cutting tool blade edge side of the middle portion or the tip portion is provided, and a spherical body having an oil injection hole is rotatably fitted to the tip end opening of the oil hole. A boring bar with an oil hole.