JPS6212527Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a cutting device configured to supply cutting fluid directly into a tool holder attached to the main spindle of a machine tool through the inside of the main spindle. The present invention relates to a drug supply device.

2. Description of the Related Art In a machining center or the like in which a tool is removable, machining is sometimes performed by supplying a cutting agent from a cutting edge through a tool provided with an oil hole.
Conventionally, in such cases, the tool holder supporting the tool has used a cutting agent supply device that supplies the cutting agent from the outside to the tool holder side without passing through the spindle. However, there was a problem of interference between the workpiece and the cutting fluid supply device, and a complicated structure was required for the connection part with the cutting fluid supply piping when the tool holder was mounted on the spindle.

[Purpose of the invention] The present invention provides a cutting agent supply device configured to supply cutting agent directly into the tool holder mounted on the main spindle of a machine tool through the main spindle. There is a particular thing.

[Structure of the invention] A main shaft of a machine tool in which a tool holder of a taper shank with a tool attached to the front and a pull stud provided at the rear can be attached and detached, the main spindle of the machine tool having a taper shank on which the tool holder is attached. A large diameter hole and a small diameter hole are formed in the rear part connected to the tapered hole, and the pull stud and a detachable collet are inserted into the large diameter hole and the small diameter through hole, and the small diameter through hole is inserted into the large diameter hole and the small diameter through hole. In the spindle structure of a machine tool, a drawbar fixed to the collet is disposed in the hole, and the tool holder is attached to and removed from the spindle by moving the drawbar forward by an advance/retreat mechanism, wherein the drawbar is moved in the axial direction of the drawbar. A conduction hole through which cutting fluid passes is bored in the drawbar, and a guide cylinder is fixed to the drawbar tip, and the guide cylinder has a hole formed in the collet with a small diameter on the tip side and a large diameter on the drawbar side. The tip of the guide cylinder has a tapered surface.
A piston is provided with a through hole drilled in the axial direction so that it can be engaged with and detached from the rear end surface of the pull stud, and a groove is formed in the tapered surface of the piston and a sealing member is inserted into the through hole of the drawbar. and a cutting agent supply device, characterized in that the cutting agent is supplied to the through hole of the tool holder via the conduction hole of the piston.

[Example] An embodiment of the present invention will be described below.

In the figure, the tool holder 11 is detachable from the tapered hole 20a of the spindle 20, has a pull stud 12 fixed to the rear part, a tool 13 (partially not shown) attached to the front part, and has a tapered shank part 1 in the center part.
1a is formed. A through hole 11b is provided in the axial direction of the holder 11 and the pull stud 12, and the tool 1 is inserted through an oil hole drilled in the tool 13.
Cutting fluid is discharged from the cutting edge of No. 3.

The main shaft 20 of the machine tool is provided with a small-diameter through hole 22 of a large-diameter portion 21 on the same axis, and a tapered hole 20a is provided on the front end side. are configured to fit together. Small diameter hole 22 in main shaft 20
A drawbar 23 that is slidable in the axial direction is arranged inside, and the drawbar 23 can be moved forward and backward in the axial direction by a forward and backward movement mechanism (not shown). The tool holder 11 is attached to the spindle 2
0, the tip of the collet 24 is advanced to the position of the large diameter portion 21 by the advance/retreat mechanism of the drawbar, and the collet 24 is opened. In this state, insert the tool holder 11 into the taper hole 2 of the spindle 20.
0a and when the drawbar 23 is retracted, the collet 24 is contracted along the small diameter hole 22, and when the pull stud 12 is gripped and the tool holder 11 is pulled rearward, the tool holder 11 is fixed to the main shaft 20.

Next, drawbar 2 is supplied from a cutting fluid supply source (not shown).
The cutting agent is guided to the conduction hole 23a in the drawbar 23 through a rotary joint (not shown) provided at the rear end of the drawbar 23.

When the cutting agent is supplied to the pressure chamber A consisting of the large diameter portion of the piston 26, the guide cylinder 25, and the drawbar 23, the end of the piston 26 is pressurized by internal pressure, so that the tapered portion 26d is inserted into the taper hole of the pull stud 12. When pressed, the piston 26 and the pull stud 12 are connected via the O-ring 27, and the cutting agent passes through the through hole 11b from the through hole 26c, and is discharged from the cutting edge of the tool 13 to be used for cutting.

When the machining with the tool 13 is completed, the drawbar 23 is advanced by the advance/retreat mechanism and the collet 2 is moved forward.
4 expands at the large diameter portion 21 within the main shaft 20, and when the pull stud 12 is released from the grip, the supply of cutting fluid is automatically stopped.

[Effects of the invention] As described above, the present invention is configured to supply cutting fluid directly into the tool holder attached to the main spindle of a machine tool through the inside of the main spindle, which is different from the conventional method. The problem of interference between the workpiece and the cutting fluid supply device and the complicated structure of the tool holder can be solved.

[Brief explanation of drawings]

The figure is a partial sectional view of the cutting fluid supply device provided in the main shaft of the present invention. 11... Tool holder, 11a... Taper shank, 11b... Through hole, 12... Pull stud,
23... Drawbar, 24... Collection, 25...
Guide cylinder, 26...piston.

Claims (1)

[Scope of Claim for Utility Model Registration] A main spindle of a machine tool in which a tool holder of a tapered shank with a tool attached to the front part and a pull stud provided at the rear part is removable, the main shaft of the machine tool having the tool holder attached thereto. A tapered hole for mounting is provided, a large diameter hole and a small diameter hole are formed in the rear part connected to the tapered hole, and the pull stud and a removable collet are inserted into the large diameter hole and the small diameter through hole, In the spindle structure of the machine tool, a drawbar fixed to the collet is disposed in the small diameter through hole, and the tool holder is attached to and removed from the spindle by moving the drawbar forward by an advance/retreat mechanism, wherein the drawbar is a drawbar. A conductive hole is formed in the axial direction of the drawbar through which the cutting fluid passes, and a guide cylinder is fixed to the drawbar tip portion, the guide cylinder having a hole portion having a small diameter on the tip side and a large diameter on the drawbar side in the collet. It can be slid into the guide cylinder, and the tip has a tapered surface inside the guide cylinder.
A piston is provided with a through hole drilled in the axial direction so that it can be engaged with and detached from the rear end surface of the pull stud, and a groove is formed in the tapered surface of the piston and a sealing member is inserted into the through hole of the drawbar. and a cutting agent supply device, characterized in that the cutting agent is supplied to the through hole of the tool holder through the conduction hole of the piston.