JPH0657502U - Cutting tools - Google Patents

Abstract

(57) [Summary] [Structure] A cutting tool having at least one ring groove provided in at least one position on the outer periphery of a shank for fitting an O-ring made of an elastic body. [Effect] A ring groove is provided in at least one or more locations on the outer circumference of the shank of the cutting tool to fit an O-ring made of an elastic body, so that a joint can be attached from the rear end surface of the shank to the vicinity of the intake hole of the supply path. It was not necessary to form an internal thread, and the amount of protrusion of the cutting tool could be further increased.

Description

[Detailed description of the device]

The present invention relates to a cutting tool for machining an inner diameter.

[0002]

[Prior art]

 Generally, when cutting a metal material, a cutting tool with a cutting tip (hereinafter referred to as "tip") clamped is used. However, since large friction heat is generated between the cutting edge of this tip and the cutting surface of the workpiece, this part Cutting oil is supplied to prevent seizure and damage to the chip surface and the cutting surface of the workpiece. It is possible to supply cutting oil from the outside of the workpiece in outer diameter machining, etc., but in the inner diameter machining, the chips enter the inside of the workpiece, so the cutting oil supply path (hereinafter, A supply path is abbreviated) to supply cutting oil.

Conventionally, as a cutting tool for machining the inner diameter, as shown in FIG. 7, a rear end surface 2b of the shank 2 is provided with an intake hole 5a, and a blade portion 4 for clamping the tip 3 at the tip is provided with an ejection hole 5b. The cutting tool T having the supply path 5 formed therein was used. As shown in FIG. 8, when the shank 2 is fixed in the fitting hole 11 of the tool fixing sleeve (hereinafter, referred to as sleeve) 10 as shown in FIG. Since a gap S is formed between the notch surface 2a formed for fixing by the above and the inner wall 11a of the fitting hole 11, it is necessary to supply the cutting oil directly into the supply passage 5 from the oil pipe 40. Therefore, a joint J for connecting the supply passage 5 and the oil pipe 40 is used, and in order to screw the joint J, from the rear end face 2b of the shank 2 near the intake hole 5a of the supply passage 5 described above. It had an internal screw formed on it.

Further, FIG. 9 shows another embodiment of a cutting tool R described in Japanese Utility Model Laid-Open No. 1125103, in which the cutting tool R has a cutout surface 2a from the rear end surface 2b of the shank 2 to a shank. The cutout surface 2a is formed only halfway, and an intake port 5a and a supply path 5 having an ejection hole 5b on the surface of the blade portion 4 are bored in the cutout surface 2a. The space S formed by the inner wall surface 11 a of the fitting hole 11 is utilized as a part of the supply path 5.

[0005]

[Problems of the prior art]

 However, the above-mentioned conventional technique has the following problems.

First, in a cutting tool in which an intake port of a supply passage is formed on the rear end face of a shank, and an internal thread is formed near the intake port in the supply passage to screw a joint for connecting an oil pipe, After appropriately cutting the rear end of the shank made of steel that has been hardened to adjust the length of the cutting tool according to the type of machine, etc., form an internal screw from the rear end of the shank near the intake hole in the supply path. It had to be done, and it was a lot of work. Further, in the cutting tool in which the cutout surface is formed only from the rear end surface of the shank to the middle of the shank, and the intake of the supply path is formed in the cutout surface 2a, it is necessary to form the inner screw as described above. However, if the cutout surface is exposed to the outside of the sleeve, oil will leak from it, so the amount of protrusion of the cutting tool must be adjusted on the part of the shank 2 where the cutout surface 2a is not formed. There was a problem that it could only be done within the range of the length (longitudinal direction), and therefore the amount of protrusion of the cutting tool could not be increased.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention fits an O-ring in a ring groove formed on the outer circumference of the shank.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cutting tool 1 according to an embodiment of the present invention used for machining an inner diameter, and 2 is a rod-shaped shank having a plurality of notched surfaces 2a in the longitudinal direction on its outer periphery. The ring groove 2c is formed in at least one or more places to fit the O-ring 20 made of an elastic material such as nitrile rubber shown in FIG. 2, and one of the ring grooves 2c is formed. The O-ring is fitted. Further, a blade portion 4 having a mechanism for clamping and unclamping the tip 3 is formed at the tip of the shank 2. Further, the cutting tool 1 is provided with a supply passage 5 having an intake hole 5a on the rear end surface 2b of the shank 2 and an ejection hole 5b on the surface of the blade portion 4.

As shown in FIG. 3, the shank 2 has a shape that can be fitted into the fitting hole 11 of the sleeve 10, and one of the ring grooves 2 c formed on the outer periphery of the sleeve 2 has the O-shape. The ring 20 is fitted, and the shank 2 is press-fitted into the fitting hole 11, and the bolt 30 is screwed into the sleeve 10 through the bolt hole 12 formed in the sleeve 10. The tip of the bolt 30 is located in the fitting hole 11. The shank 2 is fixed in the fitting hole 11 of the sleeve 10 by being pressed against the cutout surface 2a of the shank 2. Then, by mounting the sleeve 10 on the machine body (not shown), the cutting tool 1 is fixed to the machine body, and further, the rear end face 13 of the sleeve 10 is formed into a cylindrical shape and the fitting hole 11 is formed. An oil pipe 40 is inserted around the convex portion 14 having a through hole 14a communicating with the above, and cutting oil is supplied into the fitting hole 11.

As described above, in the sleeve 10 in which the cutting tool 1 is fixed to the machine body and the cutting oil is supplied into the fitting hole 11, the sleeve 10 is fitted into the ring groove 2c of the shank 2 and fitted. The cutting oil supplied into the fitting hole 11 by the O-ring 20 in pressure contact with the inner wall surface 11a of the dowel hole 11 is the O-ring in the space S between the outer periphery of the shank 2 and the inner wall surface 11a of the fitting hole 11. Since it does not leak to the part S ₁ in front of 20, the supplied cutting oil flows into the supply passage 5 through the intake hole 5a formed in the rear end face 2b of the shank, and is jetted out in the blade portion 4. It is supplied to the chip 3 through the hole 5b. Therefore, the cutting tool 1 does not need to use a joint for connecting the oil pipe 40, and therefore, the inner screw for attaching the joint from the rear end surface 2b of the shank 2 to the vicinity of the intake hole 5a of the supply path 5. Need not be formed.

Further, according to the above cutting tool 1, as long as the O-ring 20 is in the fitting hole of the sleeve 10, the cutting oil does not come out from a place other than the ejection hole 5b of the supply passage 5. Therefore, the amount of protrusion of the cutting tool 1 can be increased by forming the ring groove 2c as close as possible to the rear end surface 2b of the shank 2.

The ring groove 2c formed on the outer periphery of the shank 2 is provided at a plurality of locations in case the rear end portion of the shank 2 is cut off and the length of the shank 2 is adjusted according to the machine. Good.

The O-ring 20 is preferably made of nitrile rubber, styrene butadiene rubber, ethylene propylene rubber, silicon rubber, fluororubber, or the like, which is specified in Japanese Industrial Standard B2 401.

The supply passage 5 is not limited to the one having the intake hole 5b in the rear end surface 2b of the shank 2, and as shown in FIG. It may have an intake hole 5b.

Further, in FIG. 5, a ring groove 2c for fitting the O-ring 20 is formed in the front side portion of the shank 2, as far as the necessary amount of protrusion of the cutting tool 1 can be secured, and further. FIG. 6 shows a cutting tool 1 in which an intake hole 5a for the supply path 5 is formed in the cutout surface 2a immediately behind the O-ring 20 fitted in the ring groove 2c. Further, there is shown a cutting tool 1 in which the supply passage 5 at the front portion of the O-ring 20 is formed as a groove having a semicircular cross section. The cutting tool 1 as described above has an effect that the supply path 5 may be short and it does not take time to pierce the supply path 5.

[0017]

[Effect of device]

 According to the present invention, since the O-ring is fitted in the ring groove formed on the outer periphery of the shank, it is not necessary to form an inner screw for attaching the joint in the vicinity of the intake hole of the supply passage from the rear end surface of the shank. Furthermore, the amount of protrusion of the cutting tool can be increased.

[Brief description of drawings]

FIG. 1 is a side view of a cutting tool according to an embodiment of the present invention.

FIG. 2 is a perspective view of an O-ring fitted in a ring groove formed in the shank of the cutting tool according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a cutting tool and a tool fixing sleeve according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a cutting tool and a tool fixing sleeve according to an embodiment of the present invention in which an intake hole for a supply path is formed in a cutout surface of the sleeve.

FIG. 5 is a perspective view of a cutting tool according to an embodiment of the present invention in which a ring groove is formed in the front side portion of the shank as far as possible to shorten the length of the supply path.

FIG. 6 is a perspective view of a cutting tool similar to the cutting tool of FIG. 5, but with a supply path having a semicircular cross-section.

FIG. 7 is a side view of a conventional cutting tool in which an intake hole for a supply path is formed on a rear end surface of a shank.

FIG. 8 is a cross-sectional view of essential parts showing the cutting tool and the tool fixing sleeve of FIG.

FIG. 9 is a cross-sectional view of essential parts showing a conventional cutting tool and a tool fixing sleeve in which a notch surface is formed only from the rear end surface of the shank to the middle of the shank.

[Explanation of symbols]

 1 Cutting Tool 2 Shank 3 Cutting Tip 4 Blade 5 Cutting Oil Supply Channel 10 Tool Fixing Sleeve 11 Fitting Hole 12 Bolt Hole 20 O-ring 30 Bolt 40 Oil Pipe S Space

Claims (1)

[Scope of utility model registration request] 1. A shank is provided with a blade at its tip, a hole for ejecting cutting oil is bored on the surface of the blade, and a cutting oil supply path communicating with the hole is provided on the shank and the outer periphery of the shank is provided. A cutting tool that fits an O-ring into the formed ring groove.