JPH0636750U - Tool holder - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a holder which has a simple structure and can efficiently supply the cutting fluid to the machining position regardless of the presence or absence of the oil supply hole of the tool. A through hole 7 penetrating the tool insertion hole 6 is provided inside the holder body 1, and a hollow hole 16 'provided around the tool insertion hole 6 is communicated with the through hole 7. In this structure, when the tool has no oil supply hole, the cutting fluid is supplied through the through hole 7 and the hollow hole 16 '. On the other hand, when the tool has an oil supply hole, the straight collet 22 is removed and the tool is attached, and the cutting fluid is directly fed from the through hole 7 to the oil supply hole of the tool.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a holder for holding a rotating tool on a machine tool, and more particularly to an oil supply structure for supplying cutting fluid to the tool.

[0002]

[Prior art]

 Rotating tools such as end mills and drills are required to have a structure in which cutting fluid is supplied through the inside of the tool or through a holder in order to process chips and cool the cutting edge.

Conventionally, there is a holder proposed by Japanese Patent Publication No. 1-34723 as a holder for supplying cutting fluid to such a rotating tool. The holder of this proposal rotatably attaches an oil supply device to a chuck body that is attached to and detached from the spindle of a machine tool, and provides a plurality of hollow holes around the tool insertion hole at the tip of the chuck body. The oil supply holes are connected to allow the cutting fluid supplied from the outside into the oil supply device to be introduced into the machining position through the hollow holes.

[0004]

[Problems to be solved by the device]

 However, in the holder proposed above, it is necessary to mount an oil supply device on the outer circumference of the chuck body via a bearing, sealant, etc., which complicates the structure and increases the outer diameter dimension, which increases the price and increases the holder cost. There is a problem that deteriorates the maneuverability of.

Further, since the oil passage is bent inside the oil supply device or at the connecting portion between the oil supply device and the hollow hole, the cutting fluid supplied from the outside receives a large resistance while passing through a plurality of bent oil passages. However, there is a problem that the pressure drops and a large amount of cutting fluid cannot be supplied.

Further, some end mills, drills, etc. have an oil supply hole penetrating the inside of the tool so that the cutting fluid can be directly sent to the cutting blade through the inside of the tool. Since the cutting oil can be supplied only from the hollow holes provided around the holes, there is also a problem that the tool having such oil supply holes cannot effectively exert its own oil supply performance of the main body.

Therefore, the present invention solves the above problems and efficiently cuts both a tool having a lubrication hole and a tool having no lubrication hole with a simple structure and a low flow path resistance to cutting fluid. It is an object of the present invention to provide a tool holder that can supply liquid.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a tool insertion hole at the tip of the holder main body, a shank to be attached to and detached from the spindle of a machine tool at the rear end, and a tool insertion hole at the outer periphery of the tip of the holder main body. Attach a fastener that deforms in the radial direction, and provide a plurality of hollow holes that open in the tip of the holder body and extend in the axial direction around the insertion hole of the tool. By providing a through hole that penetrates from the rear end of the holder main body to the insertion hole of the tool, the through hole and the part of the hollow hole are communicated with each other.

[0009]

[Action]

 With the above structure, when the cutting fluid is supplied from the spindle to the through hole of the holder body with the holder body attached to the spindle of the machine tool, the cutting fluid is sent from the through hole to the tool insertion hole and hollow hole. . In this case, if a tool without an oil supply hole is inserted into the tool insertion hole, the tool insertion hole is blocked by the tool, so the cutting fluid is sent to the hollow hole and discharged from around the tool insertion hole. When a tool having an oil supply hole is inserted in the tool insertion hole, the cutting fluid in the through hole enters the oil supply hole inside the tool and is discharged through the inside of the tool.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the holder body 1 is provided with a tapered shank 2 which is detachably attached to a spindle of a machine tool at a rear end thereof, and a key groove 4 is provided on a tip side of the shank 2. The provided flange portion 3 is provided.

The tip of the holder body 1 is a cylindrical portion 5, and a tool insertion hole 6 is formed inside the cylindrical portion 5. Further, inside the holder body 1, a through hole 7 is formed along the axis thereof so as to penetrate from the rear end surface of the shank 2 to the tool insertion hole 6. The through hole 7 is formed with a threaded portion 8 of a pull tod bolt (not shown) for pulling the shank 2 into the main shaft at the rear end portion, and a threaded portion 9 into which a hollow stopper bolt 10 is screwed in is formed in the central portion. Has been formed. The stopper bolt 10 comes into contact with the rear end surface of the tool to adjust the mounting length of the tool, and a cutout groove 11 for engaging a rotating tool such as a screwdriver is formed at the end thereof. Has been done.

On the other hand, a fastening tool 12 having a dustproof cover 13 is attached to the outer peripheral surface of the cylindrical portion 5 at the tip of the holder body. This tightening tool 12 is composed of a rotating ring 14 that is rotatably held and a plurality of needle rollers 15 that are installed between the rotating ring 14 and the cylindrical portion 5, and the axis of each needle roller 15 is It is held so as to have an inclination with respect to the axis of the cylindrical portion 5. In this tightening tool 12, when the rotating ring 14 is rotated, a radial force is applied to the cylindrical portion 5 via the needle roller 15 to enlarge or reduce the diameter of the tool insertion hole 6 to attach or detach the tool.

Further, a plurality of hollow holes 16 and 17 are formed inside the cylindrical portion 5 so as to surround the tool insertion hole 6 in order to facilitate the radial deformation thereof. The hollow holes 16 and 17 are opened in the tip end surface of the cylindrical portion 5 and extend in the axial direction. One of the hollow holes 16 is formed to have substantially the same length as the tool insertion hole 6 and the other hollow hole. 17 is shorter than that.

In addition, some of the holes (four hollow holes 16 ′ in this embodiment) in the hollow hole 16 are formed to be longer in the axial direction than other holes, and the inner part of the hollow hole 16 ′ is deep. The side end portion communicates with the through hole 7 through the annular groove 18.

Further, as shown in FIG. 5, a ball-shaped nozzle 20 is rotatably attached to the ends of the four hollow holes 16 ′ through a coil spring 19, and an oil hole is provided inside the nozzle 20. 21 is formed. The nozzle 20 can hold its posture in any direction by the elastic force of the coil spring 19, and the discharge direction of the cutting fluid passing through the oil hole 21 can be freely adjusted.

The tool holder of this embodiment has the above-described structure, and FIG. 1 shows an example in which the tool A having no oil supply hole is attached to the tool insertion hole 6 by using the straight collet 22. The straight collet 22 is composed of a collet 23 vertically divided by a plurality of slits and a stopper bolt 25 attached to the end of the collet 23 via a nut 24. The collet 23 is inserted into the tool insertion hole 6. When the tool insertion hole 6 is deformed by the tightening tool 12 in this state, the collet 23 contracts and grips the tool A.

In the structure shown in FIG. 1, when the cutting fluid is supplied to the through hole 7 of the holder body 1 from the oil passage provided on the spindle of the machine tool, the tool insertion hole 6 is moved by the straight collet 22 and the tool A. Since it is blocked, the cutting fluid in the through hole 7 flows into the hollow hole 16 ′ through the inside of the stopper bolt 10 and is discharged to the processing position through the oil hole 21 of the nozzle 20.

On the other hand, FIG. 6 shows an example in which a tool B having an oil supply hole C inside is mounted. In this case, the straight collet 22 is not used, the rear end surface of the tool B is brought into contact with the stopper bolt 10 inside the holder body 1, and the tool B is directly attached to the peripheral surface of the tool insertion hole 6 by tightening the tightening tool 12. Is clamped and gripped.

In this structure, the cutting fluid supplied to the through hole 7 flows into the oil supply hole C of the tool B through the inside of the stopper bolt 10 and is sent to the machining position through the inside of the tool B.

In the structure shown in FIG. 6, the tool A having no oil supply hole may be directly attached to the tool insertion hole 6. In that case, the cutting fluid entering the inside of the stopper bolt 10 through the through hole 7 flows from the notch groove 11 at the end of the stopper bolt 10 into the annular groove 18, and is sent to the machining position through the hollow hole 16 '. Become.

[0021]

【effect】

 As described above, according to the present invention, the through hole that serves as a passage for the cutting fluid is provided inside the holder body, and the oil supply device is not required, so that the structure can be simplified and the outer diameter of the holder can be reduced. Thus, it is possible to provide a holder that is low in price and has good maneuverability.

Further, since the cutting fluid is made to flow from the through hole penetrating the holder main body in the axial direction to the tool insertion hole and the hollow hole extending in the axial direction, it is possible to reduce the bending in the flow path of the cutting fluid. This has the advantage that a smooth cutting fluid with low resistance can be supplied.

Further, since the cutting fluid can be sent from the through hole to both the tool insertion hole and the hollow hole, it is possible to supply the cutting fluid to the tool having the oil supply hole by utilizing the oil supply hole. There is an effect that can be used effectively.

[Brief description of drawings]

FIG. 1 is a sectional view showing a tool holder of an embodiment.

FIG. 2 is a partially longitudinal front view of the same.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a cross-sectional view showing a mounting portion of the above nozzle.

FIG. 6 is a cross-sectional view showing another usage example of the embodiment.

[Explanation of symbols]

 1 Holder Main Body 2 Shank 6 Tool Insertion Hole 7 Through Hole 10 Stopper Bolt 12 Tightening Tool 16, 16 ', 17 Hollow Hole

Claims (1)

[Scope of utility model registration request] 1. A tightening tool for providing a tool insertion hole at a tip of a holder main body and a shank at a rear end for attachment / detachment to a spindle of a machine tool, and for radially deforming the tool insertion hole at an outer periphery of a tip of the holder main body. A holder for a tool provided with a plurality of hollow holes that are open at the tip of the holder body and extend in the axial direction around the insertion hole of the tool, inside the holder body, along the axis of the holder body. A tool holder, characterized in that a through-hole is provided from the rear end to penetrate the tool insertion hole, and the through-hole and the part of the hollow hole are communicated with each other.