JPH0717411U - Cutting tool with oil hole - Google Patents

Abstract

(57) [Summary] [Structure] A concave cavity portion 15 is provided at the rear end of the shank portion 13, and an annular end face 31 is formed around the concave cavity portion, and an oil hole is formed in the concave cavity portion 15. 30a and 30b are opened. [Effect] The cutting oil supplied into the oil supply passage on the tool holder side flows into the concave space at the rear end of the shank portion of the cutting tool without leaking to the outside, and the oil hole that opens in the concave space is provided. It is surely guided to the tip of the tool via.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting tool with an oil hole.

[0002]

[Prior art]

 When a cutting tool with an oil hole is set in an oil-supplied tool holder, the cutting oil supplied to the tool holder must be introduced into the oil hole of the cutting tool without leaking outside from the chuck. As a measure to prevent cutting oil leakage in this type of holder, the clearance between the inner peripheral surface of the holder central hole and the outer peripheral surface of the tool shank inserted in the central hole is defined by the inner peripheral surface of the central hole. Known are the shank outer circumference sealing method that seals with a ring-shaped oil seal such as an O-ring that is fitted to the collet, and the collet sealing method that uses a special collet such as a collet with an oil seal elastic material sandwiched in the collet slit. ing.

[0003]

[Problems to be solved by the device]

 In the former shank outer circumference sealing method, each time a cutting tool with a different shank outer diameter is used, the ring-shaped oil seal material such as the O-ring is replaced with one with an inner diameter that matches the shank outer diameter, or the chuck body However, the latter collet sealing method has a drawback that not only is it difficult to perform the chucking operation for reducing the diameter of the collet, but also the collet cost becomes very high.

An object of the present invention is to provide a cutting tool with an oil hole that solves the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned conventional problems, the present invention comprises a tool body 25a and a shank portion 25, and a concave cavity portion 15 is provided at the rear end of the shank portion 13 and the concave cavity portion 15 is provided. A cutting tool with an oil hole is adopted in which the periphery of the recessed portion 15 is formed into an annular end surface 31, and oil holes 30a and 30b are opened in the recessed cavity portion 15.

[0006]

[Action]

 Insert the shank part of the cutting tool with oil hole into the collet chuck, and operate the collet chuck with the rear end annular end face of the shank part pressed against the tool rear end receiving surface, that is, the surface of the elastic sealing material. , Fix the cutting tool to the holder. At this time, the tool also moves integrally in the same direction as the chuck or collet slightly moves inward as the diameter of the chuck or collet decreases. It is pressed against the tool rear end receiving surface (surface of the elastic sealing material), and the periphery of the concave space at the rear end of the tool shank is completely sealed. Therefore, the cutting oil supplied into the oil supply passage on the tool holder side flows into the concave space at the rear end of the shank of the cutting tool without leaking to the outside, and the oil that opens in the concave space is opened. It is surely guided to the tip of the tool via the hole. However, since the annular end surface of the rear end of the tool shank contacts the tool receiving surface (surface of the elastic sealing material) on the tool holder side, a portion that contacts the annular end surface of the elastic sealing material forming the tool receiving surface. The pressing force is concentrated on, and the seal around the rear end recess of the tool shank is strongly and reliably performed.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a cylindrical holder body, and a collet chuck 2 is provided at an outer end portion thereof, An adjusting screw 24 is screwed into the shaft so as to be movable in the axial direction. The collet chuck 2 described above is well known in the art, and includes a collet 5 that fits on an outer taper surface 4 formed on the inner circumference of the tip of the holder body 1 and a male screw formed on the outer circumference of the holder body 1. The collet operating nut 7 is screwed into the portion 6 and engages with the tip of the collet 5.

An annular elastic sealing material 26 is attached to the front end of the adjusting screw 24 so as to surround the oil supply passage 11 opening in the center, and the surface of the elastic sealing material 26 forms a tool receiving surface 27. ing. Numeral 28 is a hexagonal hole portion for rotational operation formed in the oil supply passage 11, and 29 is a concave portion for rotational operation formed at the rear end of the adjusting screw 24. On one cutting tool 25, a recessed cavity 15 is formed at the rear end of the shank portion 13 except for the periphery 31, and two oil holes 30a are formed so as to open in the recessed cavity 15. 30b is provided so as to penetrate the tool body and the shank portion 13. The two oil holes 30a and 30b are formed by being twisted along the drill flute, and the other end is opened at the tip of the cutting tool 25.

A plastic brake ring 17 is embedded and fixed at an intermediate position of the male screw portion 9, and a male screw groove is formed on the outer peripheral surface of the brake ring 17, so that a female screw portion on the holder body 1 side is formed. The frictional resistance between the thrust screw 24 and the shaft 8 is increased so that the thrust screw 24 does not rotate unexpectedly.

However, a tool such as a screwdriver is inserted into the rotated operation recess 29 formed at the rear end of the adjusting screw 24, and the adjusting screw 24 is rotated in any forward or reverse direction, so that the adjusting screw 24 is held in the holder main body. It can be moved in the axial direction with respect to 1.

By thus moving the adjusting screw 24 in and out in the axial direction, the position of the tool receiving surface 27 of the adjusting screw 24 is changed in the axial direction, and the protruding length of the cutting tool 25 with respect to the holder body 1 is changed. If the adjustment is made as specified, the nut 5 of the collet chuck 2 is rotated while the end surface of the tool shank 13 and the tool receiving surface 27 of the adjusting screw 24 are in contact with each other to remove the collet 5. When the collet 5 is moved inward, the collet 5 is reduced in diameter by the outwardly widening tapered surface 4 and clamps and fixes the shank portion 13 of the penetrating tool 25. As the tool 25 moves inward, the tool 25 also tries to move inward in the axial direction. As a result, the ring-shaped end surface 31, which is the end surface of the shank portion of the tool 25, is strongly pressed against the tool receiving surface 27 (the surface of the elastic sealing member 26) of the adjusting screw 24 and comes into close contact with the concave space portion 15 between them. Sealing is performed at the annular end surface 31 around the circumference of the. At this time, the two oil holes 30a and 30b on the cutting tool 25 side that are opened in the concave space 15 of the tool shank 13 and the oil supply passage 11 on the adjust screw 24 side that is opened on the tool receiving surface 27 of the adjust screw 24. Will communicate with each other via the space in the concave cavity 15 whose periphery is sealed by the annular end face 31 as described above. Therefore, the cutting oil supplied into the holder body 1 does not leak from the anastomotic surface between the tool receiving surface 27 of the adjusting screw 24 and the tool shank end surface 31, and the cutting oil is supplied from the oil supply passage 11 of the adjusting screw 24 to the tool 25. The oil is introduced into the two oil holes 30a and 30b and is ejected from the tip of the tool 25.

When cutting oil leaks from the screw fitting portion between the adjusting screw 24 and the holder body 1 to the collet chuck 2 side, avoiding the female screw portion 8 and the male screw portion 9, the holder body is avoided. An oil seal can be interposed between the inner peripheral surface of No. 1 and the outer peripheral surface of the adjusting screw 24. The plastic brake ring 17 can also serve as an oil seal means.

Both the oil holes 30a and 30b and the one oil supply passage 11 on the adjusting screw 24 side communicate with each other through a space inside the recessed hollow portion 15 which is hermetically sealed in a use state. Then, the cutting oil supplied from the oil supply passage 11 is distributed to the tool-side oil holes 30a and 30b in the closed space inside the concave cavity 15.

Although the tool holder in which the adjusting screw 24 is incorporated in order to adjust the position of the tool receiving surface 27 in the axial direction is shown, the present invention is also applicable to a tool holder in which the tool receiving surface is fixed at a fixed position. The device can be implemented.

The holder body 1 has a shank portion to be attached directly or via a relay shank to a rotary spindle of a machine tool. Various types of shank portions are known and The invention can be applied to a holder body having any shank portion. Further, the method of supplying the cutting oil to the inside of the holder body is not particularly limited.

[0016]

[Effect of device]

 As described above, according to the configuration of the present invention, the cutting oil supplied into the oil supply passage on the tool holder side flows into the concave cavity at the rear end of the shank of the cutting tool without leaking to the outside, It is reliably guided to the tip of the tool via an oil hole that opens in the concave space. Of course, even if the outer diameter of the shank portion of the cutting tool used changes, the desired oil seal effect can be reliably obtained as long as it is within the range that can be clamped by the chuck provided. In addition, since a special collet is not necessary, it can be implemented at a relatively low cost. Moreover, as the tool is tightened by the chuck, the rear end surface of the tool shank automatically comes into pressure contact with the elastic seal material that forms the tool receiving surface on the tool holder side. Combined with the above, a strong and reliable oil seal effect can be obtained even though no special operation is required.

Further, in the present invention, since the oil hole opened at the rear end of the tool shank is opened in the concave space, both of the oil hole on the tool side and the oil supply passage on the tool holder side have the concave shape. It suffices that the opening is provided only in the region corresponding to the void portion, and high positional accuracy is not required, so that the oil hole and the oil supply passage can be easily processed. In other words, various cutting tools with different numbers of oil holes can be used for a common tool holder.

Moreover, since the recessed cavity is provided at the rear end of the cutting tool, as compared with the case where the recessed cavity is formed on the tool receiving surface side made of the elastic seal material, The elastic seal material around the oil supply passage can have a sufficient width, and even if the supply pressure of cutting oil is high, there is no risk of the elastic seal material deforming and causing oil leakage.

[Brief description of drawings]

FIG. 1 is a vertical side view.

FIG. 2 is an exploded perspective view of the same main part.

[Explanation of symbols]

 25 Cutting Tool 25a Tool Main Body 13 Tool Shank Part 31 Annular End Face 15 Concave Space 30a Oil Hole 30b Oil Hole

Claims (1)

[Scope of utility model registration request] 1. A cutting tool with an oil hole, which comprises a tool body and a shank portion, and through which an oil hole is formed so as to penetrate therethrough, wherein a recessed cavity portion is provided at the rear end of the shank portion, and this recessed portion The periphery of the void is formed into an annular end surface,
A cutting tool with an oil hole formed by opening an oil hole in the concave space.