JPS628987Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a tool holder that supplies cutting fluid from a cutting fluid supply source through a rotary joint to a tool and tool holder equipped with an oil hole through the axis of a freely rotatable spindle. Relating to a gripping device.

In machining centers equipped with automatic tool changers, various tools are sequentially supplied to the main spindle and machining is performed, but each tool has a different diameter and length, and during machining, the direction of the nozzle placed near the main spindle must be adjusted. It was reworked and fed to the cutting surface. In addition, if the amount of cutting agent is insufficient to supply it with a single nozzle, a specially made nozzle that discharges cutting agent over a wide area is used. The former method is unsuitable for unmanned operation, and the latter method has the disadvantage that cutting fluid is often scattered and efficiency is poor. For this reason, tools having oil holes in themselves have been developed and put into practical use. However, conventional machine tools are of the turret type, and piping is connected from the outside to the tool adapter attached to each spindle, and cutting fluid is applied to the tool from the direction perpendicular to the axis of the tool via the adapter. Because it is a supplied product, there was the inconvenience of having to redo the piping every time the tool was changed.

This invention was developed to solve the problems of conventional machine tools, and supplies cutting fluid to a tool with an oil hole from the direction of the main axis of the machine tool, through the main spindle, and through the tool holder. An object of the present invention is to provide a tool holder gripping device.

FIG. 1 shows a sectional view of a main shaft incorporating the tool holder gripping device of the present invention. 1 is a drill which is a tool having an oil hole, 2 is a tool holder having a tapered shank that supports the drill 1 and has a through hole 2a in the axial direction, and 3 is a small diameter through hole 3a continuous with the through hole 2a. and a pull stud shaft provided with a large diameter through hole 3b and screwed onto the shaft end of the tool holder 2; 4 is a check valve disposed in the through hole 3b;
The check valve 4 is attached to the pull stud shaft 3 on the holder 2 side.
A through hole 3a is provided with a spring receiver 4a screwed onto the spring support 4a.
Steel ball 4b and spring receiver 4a enclosed within
The spring 4c is press-fitted between the steel ball 4b and the steel ball 4b. Reference numeral 5 denotes a rotatably supported spindle, and a tapered hole portion 5 in which a tool holder is mounted near one end of the spindle as a common axis with the spindle axis.
a, a through hole 5b penetrating from the hole portion 5a in the axial direction of the spindle 5; cutting agent recovery chambers 5c and 5d having a diameter larger than the through hole 5b for collecting cutting agent; and recovery chamber 5;
A cutting agent recovery path 5e is connected to the main shafts 5c and 5d, is inclined in the direction of the tip of the main shaft 5, and is shaped so as to be collected into a cutting agent tank (not shown). 6 is a collection chuck that is gripped from the outside of the pull stud shaft, 7
is inserted into the inner cylindrical surface of the collector chuck 6 by screwing one side thereof, and the bolt 7a tightens the collector chuck 6.
Hollow cylindrical part 7 provided on the pull stud side.
b and a flow path 7c extending in the axial direction following the hollow cylindrical portion 7b. It can be carried out. 8 has a conical portion 8a at the shaft end that can be closely attached to the conical surface provided on the end surface of the pull stud shaft, and a key groove 8 in the axial direction on the outer cylinder surface.
9 is a main shaft 5, a collection chuck 6,
A key 10 that engages with the key groove 8b of the spool 8
is a check valve, the handle 10b is loosely fitted in the hollow cylindrical part 8d, the outer periphery is provided with a cutout groove 10a through which cutting fluid can pass, the handle 10b can be connected to the pull stud shaft 3, and the spool is disposed on the side opposite to the tool. It consists of a conical valve 10c that can be engaged with the end of the flow path of 8. Reference numeral 11 is a cup-shaped spring retainer having a hole 11a in the cup passage portion and inserted into the hollow cylindrical portion 7b of the drawbar 7. Reference numeral 12 is a spring interposed in contact with the spring retainers 11 and 10c. Reference numeral 13 is a hollow part of the drawbar. This is a spring interposed in contact with the bottom of the cylindrical portion 7b and the spring presser 11.

Next, the operation of the tool holder gripping device of the present invention will be explained.

Now...the spool 8 is pushed backward by the pull stud shaft 3, which is mounted on the tool holder 2 with the drill 1 mounted in the hole 5a of the main shaft 5, and the check valve is pressed against the springs 12 and 13. 1
0 moves rearward, and the conical end of the pull stud shaft 3 comes into close contact with the conical part 8a of the spool 8. next,
When the drawbar mechanism (not shown) draws the drawbar 7 to the right in the drawing, the tip of the collection chuck 6 located near the collection chamber 5c comes into contact with the shoulder of the hole 5a of the main shaft 5, and the inner cylinder of the hole 5a Pull the pull stud shaft 3 backward while being guided by the
Furthermore, the close contact between the spool 8 and the pull stud shaft 3 is strengthened. Also, due to the engagement between the pull stud shaft 3 and the spool 8, the check valve 10 is also opened by the spring 12.
The valve 10c is pushed toward the right in the drawing against the pressure, and the valve 10c opens.

Therefore, the cutting fluid under pressure from the cutting fluid supply source passes through the rotary joint (not shown) to the flow path 7.
c, hollow cylindrical portion 7b, hole 11a of spring retainer 11, hollow conical portion 8d of spool 8 passing through valve 10c of check valve 10, notch groove 1 of check valve
0a to the small diameter through hole 3a of the pull stud shaft 3. Here, push the spring 4c that supports the steel ball 4b, and pass through the through hole 3b of the tool holder 2.
Cutting fluid is supplied to the drill 1 provided with an oil hole through a.

Note that when removing the tool holder 2 from the spindle 5,
The drawbar 7 is moved by the drawbar moving mechanism (not shown).
By pushing out the tool in the same direction as the cutting fluid flow, the collector chuck 6 releases the clamp on the pull stud shaft 3, and when the tool is removed, the spring 12
The check valve 10 is closed by the action of the spool 8.
This prevents cutting fluid from entering into the hollow cylindrical portion 8d. The cutting fluid leaking from the spool 8 and the pull stud shaft 3 when the tool is removed is collected in the collection chambers 5c and 5d, and is collected in the cutting fluid tank via the cutting fluid collection path 5e.

Furthermore, when the spindle 5 is rotated with a new tool attached, the cutting agent remaining in the recovery chambers 5c, 5d and the cutting agent recovery path 5e is shaken off by the salt center force and can be recovered in the cutting agent tank.

As described above, the present invention has a cutting fluid flow path provided in the main shaft of a machine tool and a check valve 4 provided on the tool holder side to prevent cutting fluid from leaking when the tool holder is removed from the main shaft. By using the check valve 10 provided in the main shaft, it has become possible to reliably discharge cutting fluid from a tool having an oil hole.

Therefore, it is possible to eliminate the trouble of changing the piping for supplying the cutting agent in conjunction with the conversion of the tool holder as in the past, and it is possible to efficiently pour the cutting agent to the machining location, thereby improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the tool holder gripping device of the present invention, Fig. 2 is a diagram showing the state when the tool holder is attached and removed, and Fig. 3 is a state in which the drawbar is pushed out and no tool holder is attached to the main shaft. FIG. 4 is a diagram showing the initial state of the machine. 1... Tool, 2... Tool holder, 8... Spool, 10... Check valve, 11... Spring holder, 12... First spring, 13... Second spring.

Claims (1)

[Claim for Utility Model Registration] A taper shank tool holder with a pull stud shaft fixed at the rear and a tool mounted at the front, the tool holder having a cutting agent passage in the axial direction through the pull stud. A tool gripping device for a tool holder configured to be able to discharge cutting fluid from near the cutting edge of the tool through the cutting fluid passage, the tool gripping device comprising: (a) a tip of the spindle for fitting a taper shank of the tool holder; (b) a through-hole in the spindle that is continuous with the tapered hole and is formed along the axial direction of the spindle; (c) a through-hole in the spindle that is movable in the axial direction within the spindle through-hole; (d) A drawbar provided on the drawbar, the outer end of which is reduced in diameter by engaging with a shoulder formed in the through hole in the main shaft, and the inner end of which is engaged with the enlarged part of the end of the pull stud. (e) A through-hole in the drawbar that is provided in the drawbar and communicates with a cutting fluid supply source; (f) A hollow cylinder that is slidably and tightly housed in the through-hole in the drawbar; (g) a conical surface provided on the tool-side end surface of the spool and tightly engaging the end surface of the pull stud to communicate the hollow portion of the spool with the cutting agent passage of the pull stud; (h) the spool; A check valve having a handle which is fitted into a hollow part and has a cutout groove through which cutting fluid can pass, and a conical valve which is provided on the side of the handle opposite to the tool and closes the hollow part of the spool from the side opposite to the tool. (i) A first spring that is located on the opposite side of the spool and is slidably housed in the through hole in the drawbar, and that includes the conical valve and a first spring that urges the conical valve toward the tool side. A tool holder gripping device comprising: a cup-shaped spring holder that accommodates the spring holder and has a flow port formed at its bottom; (j) a second spring that biases the spring holder toward the tool side.