KR100416487B1 - Collet air supplying device of main spindle with a serial connecting motor - Google Patents

Abstract

The present invention relates to a collet air supply device capable of supplying clean air to the collet side when the automatic tool is changed from the spindle by using a direct type motor to a machining center. The present invention relates to a spindle 12 of a machining center. An apparatus for removing foreign matters attached to the collet by injecting air during automatic tool change through the draw bar 18 through the draw bar 18 directly connected to the side drive motor 14, the rear end of the spindle 16 And a connector 20 connected between the output end of the driving motor 14 and the connector 20 having a connection passage 21 connected to the air supply passage 18a of the draw bar 18. Forming; Air injection valve means 30 is installed on the headstock 12 side to be connected to the pneumatic line at a predetermined stroke interval with the inlet of the connecting passage 21 to inject air into the connecting passage 21 of the connector 20. The air injection valve means 30 is moved by an operation stroke when the tool change operation is performed while the spindle 16 is stopped at the correct position, thereby connecting the connection passage 21 of the connector 20. It is characterized in that the air is configured to be supplied to. Therefore, the present invention can be coupled to the spindle of the general-purpose motor, which is relatively inexpensive compared to the built-in motor or through-type motor to the spindle, while supplying and spraying the air for cleaning the collet into the spindle, the production cost of the machine tool Can be lowered.

Description

Collet air supplying device of main spindle with a serial connecting motor}

The present invention relates to a collet air supply device installed on a main shaft of a horizontal / vertical machining center, to eject foreign matters stuck to a tool by injecting air to the collet side when a tool is exchanged. The present invention relates to a collet air supply device for motor-directed main spindles that can supply clean air to the collet side when the automatic tool change is performed in the spindle using a type motor.

A common machine tool uses a parallel spindle drive motor using a gear or a belt to increase spindle torque and perform powerful cutting.

4 shows a collet air supply device to which a parallel spindle drive motor is applied. In FIG. 4, the draw bar 18 is mounted inside the spindle 16 so as to be operated forward and backward by the piston 2, and the spindle 16 is connected to the drive motors G1, G2, and G3 by a driving motor ( It is driven to rotate by receiving power through 3). And the rear end of the draw bar 18 is connected to the connecting port (6) connected to the pneumatic line, the air supplied to the connecting port (6) is the spindle 16 through the air supply passage (18a) of the draw bar 18 It is supplied to the taper side of the tool at the time of tool change and injected into the collet.

However, in recent years, the need for high speed cutting is increasing as much as strong cutting. Therefore, for high speed cutting, the use of a direct spindle drive motor capable of speeding up and removing gears and belts that cause serious problems in noise and balancing at high speed is increasing. Direct type drive motor has a built-in (BUILT-IN) motor and a general type motor separately.

The built-in type of the direct-type motor is no different from the case of the collet air supply system in which the collet air supply device is installed, but the price is higher, the delivery time is low, and the maintenance is lower than that of the general market motor.

In the case of the general motor, there is a disadvantage in that the configuration of the collet air supply device also occurs. Recently, a through-type motor has been developed among general motors and is applied as shown in FIG. 4.

However, the use of a through-type motor has a disadvantage in that it is expensive and disadvantageous in price competition of machine tools.

On the other hand, the configuration of the spindle through cutting oil (TSC) line is as important as the collet air supply. If TSC's demand is required, expensive through-type motors will be available, but TSC's requirements are not common and are usually optional, while collet air is a must. Thus, there is a need for a collet air supply device that can be easily applied to a general motor considering cost advantages and maintainability without requiring TSC.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a collet air supply device of motor direct type main spindles to easily supply collet air while taking advantage of the direct type drive motor.

Specific means of the present invention for achieving the above object,

A device for removing foreign matter attached to the collet by injecting air during automatic tool exchange through a draw bar into the spindle directly connected to the driving motor of the machining center.A connector between the rear end of the spindle and the output end of the driving motor. It is connected to the mounting, the connector to form a connection passage in communication with the air supply passage of the draw bar;

And an air injection valve means connected to the pneumatic line at a predetermined stroke interval with the inlet of the connection passage and installed on the main shaft side to inject air into the connection passage of the connector, wherein the air injection valve means has the spindle in the correct position. When the tool change operation is performed in the stopped state to move the operation stroke is characterized in that the air is supplied to the connection passage of the connector.

According to the above means, when a tool change call is made and the spindle stops rotating at the correct position, the piston of the air injection valve means is sequentially operated to be connected to the connection passage of the connector, and the air pressurized through the supply line is connected to the piston, It is sprayed on the collet through which the tool is exchanged through the passage and the draw bar to effectively remove the foreign matter.

When the tool change operation is completed, the piston on the air injection valve means returns to its original position, and the spindle becomes rotatable again.

The present invention operated as described above has the advantage of supplying air to the collet side while using a general motor as a direct type, and can use a general motor which is relatively inexpensive compared to using a through-type motor, a built-in motor or a parallel motor. It can be advantageously economically lower production costs.

1 is a front sectional view showing a collet air supply apparatus of a motor direct type main spindle according to an embodiment of the present invention;

2 is a partial plan view of FIG. 1;

3 is an enlarged cross-sectional view of portion A of FIG.

4 is a configuration diagram of a collet air supply apparatus when a conventional parallel spindle drive motor is used.

<Explanation of symbols for the main parts of the drawings>

20: connector 21: connection path

30: air injection valve device 32: piston housing

34: piston 34a: air supply passage

36: compression spring 52: proximity switch

54 dog 62 stretch member

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front sectional view showing a collet air supply apparatus of main spindles according to an embodiment of the present invention, FIG. 3 is a partial plan view of FIG. 1, and FIG. 3 is an enlarged sectional view of part “A” of FIG. 1.

As shown in FIGS. 1 to 3, air is supplied during automatic tool change through the draw bar 18 into the spindle 16 directly connected to the driving motor 14 on the spindle 12 of the machining center. A device for removing foreign matter attached to a collet, the connector 20 is attached to the rear end of the spindle 16, the rotary shaft 14a of the drive motor 14 and the connector 20 A pair of couplings 13A and 13B are coupled to each other.

The connector 20 is provided with a connecting passage 21 penetrating horizontally and vertically. The connecting passage 21 has one inlet 21a disposed radially and the other outlet 21b having the draw bar. It is in linear communication with the air supply passage 18a penetrated by 18.

A flange 19 is inserted into the rear end of the draw bar 18, and the flange 19 is mounted between the spindle 16 and the connector 20.

Accordingly, the rotational force of the drive motor 14 is transmitted to the spindle 16 via the couplings 13A and 13B, the connector 20 and the flange 19, and the spindle 16 rotates or draws. Even when the bar 18 operates forward and backward, the air supply passage 18a formed in the draw bar 18 and the connection passage 21 formed in the connector 20 are always in communication.

Reference numeral 30 is connected to a pneumatic line (not shown) at regular intervals (S) from the inlet 21a of the connector 20 side connecting passage 21 to supply air to the connecting passage 21 of the connector 20. It is an air injection valve device installed on the headstock 12 side to inject.

Here, the pneumatic line is an air supply line connected to the pneumatic pump (not shown) of the machining center. The pneumatic pump cools the ball screw in the machining center, forms an air curtain in front of the spindle, or ATC. (Automatic tool changer) Used as a pneumatic source when stopping.

As shown in FIG. 2, the air injection valve device 30 moves by an operating stroke S when the tool change operation ATC is performed while the spindle 16 is stopped at a fixed position. It is configured to supply air to the connecting passage (21).

The air injection valve device 30 is mounted on the main shaft 12 side bracket 31 to be fixed to the connector 20 and is fixed to the piston housing 32 having a hydraulic oil supply port 32a, and A piston 34 slidably coupled to the piston housing 32 and having a piston air supply passage 34a connected to the pneumatic line of the machining center through the center thereof, and air pressure to the piston 34; It is provided with a compression spring (36) interposed between the piston (34) and the housing (32) to return it to its original position when pressure is interrupted.

Reference numerals 38 and 39 are connection ports respectively connected to the hydraulic oil supply port 32a and the air supply passage 34.

In this embodiment, the end of the air supply passage (34a) of the piston 34 has a hole (62a) in communication with the air supply passage (34a) in series with the connection passage 21 of the connector (20) Further, when the hole 62a is connected to the inlet 21a of the connecting passage 21, an expansion and contraction member 62 is further mounted to cushion and maintain airtightness. The stretchable member 62 may be made of general rubber, silicone rubber, or urethane resin.

In addition, the inlet 21a of the connector 20 is chamfered to the flat surface 20a so that the bottom surface of the elastic member 62 is in close contact with the inlet 21a side of the connecting passage 21 of the connector 20. .

The compression spring 36 is an elastic member from the inlet 21a of the connection passage 21 of the connector 20 by pushing the piston 34 to one side by the elastic force before the working pressure is formed in the hydraulic oil supply port (32a) The underside of 62 is separated by the stroke S of the piston 34.

The piston housing 32 is formed with an air hole 32b that allows the suction and discharge of air when the piston 34 reciprocates the moving section S. FIG.

The directional control valves (not shown) are connected to the pneumatic lines connected to the hydraulic oil supply port 32a and the piston air supply passage 34a, respectively, and the air pressure acts according to the electrical control directions of the directional control valves. .

And the supply line portion connected to the piston air supply passage 34a of the piston 34 is made of a flexible material to enable the reciprocating operation of the piston 34.

The operation of this embodiment configured as described above will be described.

When the spindle 16 is rotated by the drive motor 14, the piston 34 is moved by the elastic restoring force of the compression spring 36 without pneumatic pressure acting on the hydraulic oil supply port 32a. Ascending by), the hole 62a between the connecting passage 21 of the connector 20 and the elastic member 62 on the piston 34 side is spaced apart from each other by a stroke S.

In this state, when the command of tool change is released by the control of the machining program, the spindle 16 stops at the correct position, and the tool bar mounted on the spindle 16 advances the draw bar 18 in which the cylinder is operated in a well-known cylinder manner. It is moved to an unclamped state and removed by an automatic tool changer (ATC). At this time, even when the draw bar 18 moves forward, the air supply passage 18a of the draw bar 18 and the connection passage 21 of the connector 20 communicate with each other.

When a tool not shown is removed, pneumatic pressure acts on the hydraulic oil supply port 32a of the air supply valve device 30, and air is supplied to the air supply passage 34a of the piston 34.

With the pneumatic pressure flowing into the hydraulic oil supply port 32a, the piston 34 overcomes the compression spring 36 force and descends, and the elastic member 62 attached to the piston 34 is cut out on the connector 20. ), And at the same time, the hole 62a of the elastic member 62 is connected to the inlet 21a of the connecting passage 21 of the connector 20.

Accordingly, the air introduced into the air supply passage 34a on the piston 34 side is tapered at the tip end side of the spindle 16 along the connection passage 21 of the connector 20 and the air supply passage 18a of the draw bar 18. Sprayed to the negative.

The injection air injected from the spindle 16 cleans the tool and the collet to be exchanged in the ATC, including the tapered portion to which the collet is clamped.

When the ATC continuously replaces the tool and clamps the spindle 16 again, the air supply to the piston 34 is stopped, and the hydraulic pressure applied to the hydraulic oil supply port 32a on the piston housing 32 is no longer applied. I never do that.

Therefore, the piston 34 again rises to the original position by the elastic restoring force of the compression spring 36, and the air injection valve device 30 again maintains the air injection standby state.

As described above, the present invention can effectively perform collet cleaning during tool change using the air injection valve device 30 even if a general type motor, not a built-in motor, a through-type motor, or a parallel motor structure is used.

Therefore, since the price of the general type motor is relatively low, the manufacturing cost of the machining center can be lowered at low cost.

On the other hand, the present invention may be further added to the valve operation detecting means for confirming the operation of the air injection valve device 30 as shown in FIG.

The valve operation detecting means 50 is fixed to the proximity switch 52 in the vicinity of one side of the piston 34, by attaching a dog 54 to the piston 34 to correspond to the proximity switch 52 It is made up. In this case, the proximity switch 52 is installed to face the dog 54 at a predetermined sensing interval when the piston 34 is in an up position before operation, and the electrical signal from the proximity switch 52 is, for example, ATC call. Signal or spindle stop call signal to detect normality or malfunction of the piston 34, and if the malfunction of the piston 34 occurs, the proximity switch 52 does not detect the dog 54 and is electrically not shown. It can be connected to a lamp or warning speaker to inform the operator of normal and defective operation.

On the other hand, the present invention is not limited to the above embodiment in the structure connecting the piston 34 and the air flow paths 34a and 21a of the connector 20.

For example, the connection structure between the lower end of the piston 34 and the hole 21a of the connection passage 21 of the connector 20 may be configured as a conical tapered insertion structure.

In addition, although the method of operating the piston 34 by pneumatic pressure is used, of course, it can be operated hydraulically. In this case, an additional oil recovery line will be added.

As described above, according to the collet air supply apparatus of the motor direct type spindle of the present invention, a general type motor which is relatively inexpensive compared to a built-in motor, a through type motor, or a parallel type motor can be coupled to the spindle in a direct connection method. Air can be injected and sprayed to clean the collet internally, thereby lowering the manufacturing cost of the machine tool.

That is, the present invention has the effect of excellent supply of the collet air while taking advantage of the low cost of the direct type motor.

Claims (4)

In the apparatus for removing foreign matter attached to the collet by injecting air during automatic tool change through the draw bar 18 into the spindle 16 directly connected to the drive motor 14 on the spindle 12 of the machining center. In The connector 20 is connected and mounted between the rear end of the spindle 16 and the output end of the drive motor 14. The connector 20 communicates with the air supply passage 18a of the draw bar 18. A connection passage 21 formed therein; It is connected to the pneumatic line at a predetermined stroke interval with the inlet of the connecting passage 21, when the tool change operation is performed in the state in which the spindle 16 is stopped in the correct position is moved by the operation stroke of the connector 20 Collet air supply device for a motor-directed main shaft, characterized in that it comprises an air injection valve means (30) installed on the headstock 12 to inject air into the connecting passage (21). The method of claim 1, The air injection valve means 30, A piston housing (32) fixedly disposed close to the connector (20) and having a hydraulic oil supply port (32a); A piston 34 slidably coupled to the piston housing 32 in a predetermined section and having a piston air supply passage 34a penetrated in the center thereof; When the air pressure is stopped in the piston (34) of the motor direct connection main shaft, characterized in that it comprises a compression spring (36) interposed between the piston (34) and the housing (32) Collet air supply. The method of claim 2, The air injection valve means 30, And a valve operation detecting means (50) for detecting an operation stroke section of the piston (34) to check the state of the air injection. The method of claim 2, A hole (62a) formed at an end of the air supply passage (34a) of the piston (34) in communication with the air supply passage (34a) and connected to the connection passage (21) of the connector (20); Collet air supply device for a motor-directed main shaft, characterized in that the expansion and contraction member 62 is added to the buffer (62a) when the opening (62a) is connected to the inlet of the connecting passage (21).