JPH09183002A - Internally lubricated cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internally lubricated cutting tool which can effectively supply cutting oil to the flank of a cutting blade without using any special cutting blade chips. SOLUTION: A holder 2 is diagonally cut off at the corner of its end to form a space 7 with a large front clearance, where a nozzle 8 is attached to the holder. The nozzle 8 is provided with an oil spit hole 8a open to the flank, and an oil supply passage 6 leading to the nozzle 8 is provided inside the holder 2 so that cutting oil supplied through the oil supply passage is ejected directly to the flank from the oil spit hole 8a in the nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used for turning, and more particularly to an internal oil supply type cutting tool capable of effectively supplying cutting oil to the flank of a cutting edge tip through the inside of a holder.

[0002]

2. Description of the Related Art In wet cutting, cutting is performed while supplying cutting oil to a cutting portion. When supplied to the rake face side of the cutting edge tip, this cutting oil is effective in improving chip disposability and effective in suppressing flank wear, and when supplied to the flank side of the cutting edge tip, effective in suppressing flank wear. There is. Therefore, it is desirable to supply to both the rake face and the flank face. Further, since the tool life is largely affected by flank wear, it is also effective to supply only to the flank side.

However, the general supply of cutting oil in turning is performed from a hose, a nozzle or the like through a turret of a machine tool so that the supply of cutting oil can be performed in synchronization with the feeding of a tool. Does not effectively supply cutting oil.

Therefore, several techniques have been proposed to solve the problem. For example, in Japanese Utility Model Laid-Open No. 56-11003, a recess is provided in a seat surface formed on a floor plate or a holder, cutting oil enters the recess through an oil supply passage in the holder, and is opened on the flank side of the chip. What is ejected from the ejection port of the recessed end to the cutting portion and its surroundings is disclosed, and in JP-A-5-23776, a recess is provided on the flank of the cutting edge tip, and the holder is provided. There is disclosed a technique in which a coolant duct and an outlet hole communicating with the duct from the duct to the lower end of the recess are provided so that the cutting oil travels through the recess and concentrates in the wear region of the flank.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the technique disclosed in Japanese Patent No. 1003, since the ejection port at the recess end is opened laterally in front of the tool, the cutting oil once hits the rotating work piece and is reflected there, so that part of the oil is To the flank. Therefore, the cooling and lubrication of the flank cannot always be said to be sufficient.

In the technique disclosed in Japanese Patent Laid-Open No. 23776/1993, the cutting oil can be supplied to the flank well, but on the other hand, a special special chip is required and a standard general-purpose chip cannot be used, which is economical. Inferior. Moreover, it is not easy to deal with the case where the outlet hole of the duct is blocked by a foreign substance.

Therefore, an object of the present invention is to make it possible to effectively supply the cutting oil to the flank without making the cutting edge tip special.

[0008]

In order to solve the above problems, in the present invention, in the cutting tool, a portion having a large front relief amount is formed in the front relief portion of the holder, and the cutting portion is provided at the portion. The nozzle with the oil ejection port opened toward the flank of the blade tip was installed with the amount of protrusion from the holder within the space of the front relief, and an oil supply passage communicating with the nozzle was provided inside the holder. Of.

The nozzle is preferably attached by screwing. There are two methods of screwing: a method of directly screwing the nozzle itself by providing a screw part on the nozzle and a method of retaining the nozzle with a separate set screw. In the former method, the nozzle holder It is preferable to provide a rotation operation portion on the protruding portion.

The cutting tool of the present invention may be either one in which the cutting blade tip is detachably attached to the holder, or one which is attached by brazing to the holder.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a cutting tool of the present invention. This bit consists of a cutting blade tip (in the figure, a throw-away tip) 1, a holder 2, and a supporting seat 3 (in the drawing, a seat using a floor plate 4) provided at an upper corner of the holder tip. And a clamp mechanism 5 for mounting. A holder 2 in which the space 7 is large by cutting off the corner portion of the holder tip of this bite obliquely to create a front escape
The nozzle 8 is attached to the lower part of the. The space 7 has diagonal cut-off corners, and the cut-off surface has an inclination of 45 ° with respect to the longitudinal direction of the holder 2, and FIG.
Also in the A direction view (see FIG. 1D), it is generated so that the front clearance angle of γ is added.

The nozzle 8 is mounted so that the protruding portion from the holder 2 is accommodated in the space 7, and therefore there is no fear that the nozzle 8 interferes with the workpiece. The nozzle 8 has an oil ejection port 8a that is drawn from the center to the outer peripheral surface, and is attached to the holder 2 by adjusting the direction so that the ejection port 8a opens toward the flank of the cutting edge tip 1. Has been. This spout 8a has a central hole 8b (see FIG. 1 (b)).
It is connected to. In addition, the inlet of the center hole 8b is the holder 2
The cutting oil introduced from the rear end of the holder reaches the nozzle 8 through the oil supply passage 6 and is ejected from the ejection port 8a to the flank of the cutting blade tip 1 through the oil supply passage 6. To be done.

The cutting tool shown in FIG. 1 has a front clearance angle γ (see FIG.
(D)) is set to 7 °, and the holder 2 has a so-called jaw shape in order to obtain a sufficiently large space 7 at this angle. However, if the angle γ is increased, a space of a required size can be obtained even for a holder without a jaw. Can give rise to 7. If the value of γ is too large, the strength of the holder decreases, so the range of 3 ° to 45 ° is preferable.

A similar space can be obtained by a structure in which the front clearance of the holder 2 is changed in two steps as shown in FIG. 2 or a structure in which it is gently changed by a curve as shown in FIG.

Further, as shown in FIG. 4, when the front relief surface attached to the tip corner of the holder 2 is formed into a concavely curved surface,
Diffusion of the jetted cutting oil can be prevented, and the cutting edge flank can be cooled and lubricated more effectively by the cutting oil.

5 and 6 show modified examples of the nozzle 8. The nozzle of FIG. 1 is fixed to the holder by press fitting or the like, but the nozzle cannot be attached or detached by this method. Therefore, in the nozzle 8 of FIG. 5, a flattened portion 9 is provided on a protruding portion from the holder 2 so that the tip side has a non-circular cross section, and a screw portion 10 integrally formed on the rear portion is used as a rotary operation portion. The structure is such that it is screwed into the screw hole provided in. The tip of the nozzle 8 of FIG. 6 is bent in an L shape, and the screw portion 10 at the rear is screwed into the screw hole on the holder side by using this as a rotation operation portion. Since the nozzles shown in FIGS. 5 and 6 can be easily removed and replaced, even if the tool is damaged by long-term use or the internal hole is clogged with foreign matter, the continued use of the holder is not hindered.

As shown in FIG. 7, the nozzle 8 is attached to the set screw 1
The same effect can be expected for the one that is prevented from slipping off. Since this type does not require threading the nozzle, it is advantageous when the nozzle 8 is made of a material that is difficult or impossible to thread, for example, cemented carbide or ceramics having good wear resistance.

In addition, although the holders 2 are all provided with jaws, it is not essential that they are provided with jaws. Further, the holder with jaws may be configured by combining a holder without jaws and a jaw portion processed separately from the holder. In this case, the existing jawless holder can be converted into the bite of the present invention by additional machining of the oil supply passage and additional attachment of the jaw portion.

[0019]

As described above, since the cutting tool of the present invention can effectively supply the cutting oil to the flank without making the cutting edge tip special, even if it is a general-purpose cutting tool. It is possible to extend the tool life by reducing the flank wear that affects the blade life.

Further, in the case where the nozzle is detachably attached by screwing, the nozzle which is damaged or has a hole clogging can be replaced to restore the cutting oil supply function.

In addition, the nozzle provided with the rotary operation portion directly screwed into the holder can easily replace the nozzle.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment of a cutting tool of the present invention. FIG. 1B is a perspective view of a nozzle used in the cutting tool of the same. FIG. 1C is a plan view of a main part of the cutting tool of the same. ) A direction arrow view

FIG. 2 is a diagonal side view of another embodiment.

FIG. 3 is an oblique side view of still another embodiment.

FIG. 4 is an oblique side view of still another embodiment.

FIG. 5 is a perspective view showing a modified example of the nozzle.

FIG. 6 is a perspective view showing a modified example of the nozzle.

FIG. 7 is a perspective view showing another mode of screwing the nozzle.

[Explanation of symbols]

 1 Cutting Edge Chip 2 Holder 3 Support Seat 4 Laying Plate 5 Clamping Mechanism 6 Oil Supply Path 7 Space 8 Nozzle 8a Oil Jet 8b Center Hole 9 Flat Face 10 Screw Part 11 Set Screw γ Front Clearance Angle

Claims (3)

[Claims] 1. In a cutting tool constituted by mounting a cutting edge tip on a support seat at the tip of a holder, a portion having a large front relief amount is formed in a front relief portion of the holder, and at that portion,
Attach the nozzle with the oil ejection port opened toward the flank of the cutting edge tip so that the amount of protrusion from the holder is within the space of the front relief, and further, inside the holder, provide the oil supply passage leading to the nozzle. An internal refueling type bite that is provided. 2. The internal oil-filling tool according to claim 1, wherein the nozzle is detachably attached to the holder by screwing. 3. The internal oil supply type bite according to claim 2, wherein a rotation operation portion is provided on a protruding portion of the nozzle from the holder.