JPH09207048A - Machine too having rotary seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool to eliminate a need for a hose for a coolant communicated with a rotor seal device, facilitate an change work, and set an interaxis distance to a low value. SOLUTION: A rotary seal device 7 comprises a rotation part 11 and a fixed part 12, the rotary part 11 is integrally attached to the rear end of a main spindle 4, and a fixed part 12 separated away from the rotary part 11 is directly attached to the rear wall 5 of a gang head body. The slide contact member 19 of the rotary part 11 and the slide contact member 38 of the fixed part 12 are brought into relative rotatable and liquidtight pressure contact on the same axis. This constitution eliminates a need for a bearing, and feeds a coolant from a ear wall 5 to the main spindle 4 through the rotary seal device 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool having a rotor seal device attached to the rear of a spindle for supplying a coolant to the spindle.

[0002]

2. Description of the Related Art In a conventional machine tool, a main shaft is provided with a rotor seal device. This rotor seal device is composed of a rotating portion and a fixed portion, and the rotating portion has a seal member (sliding member) at its rear end. ) Is provided, the tip part is integrally attached to the rear end of the main shaft so as to rotate together with the main shaft, and the fixed part is pressed against the housing in which the bearing is fitted and the seal member provided on the rotating part. It consists of an end cap to which a seal member (sliding contact member) is attached. The rear part of the rotating part is pressed as much as possible and the rear part of the rotating part is covered by the housing of the fixed part, and a coolant flow path is provided on the same axis of the rotating part and the fixed part. The flow path of the rotor seal device communicates with the flow path of the main shaft of the machine tool, and a hose that supplies coolant to the rotor seal device is connected to the end cap of the fixed part, and the coolant is fixed. It is adapted to be supplied to the main shaft from the part through the rotating part. In the machine tool equipped with this rotor seal device, the worn seal member of the rotor seal device can be replaced by
Remove the bolt that connects the housing and the end cap,
It is designed such that the end cap is removed from the housing.

[0003]

In a machine tool provided with the rotor seal device, a hose for coolant is pipe-connected to a fixed portion of the rotor seal device. Therefore, in a machine tool having a large number of spindles, a large number of hoses are used. As a result of the piping of the hose, there is a problem that the handling of the hose is extremely troublesome and the hose hinders the replacement of the rotor seal device itself. Further, in a machine tool in which a rotary main shaft and a rotary shaft of a machine tool are arranged in parallel, there is a problem that the distance between the shafts is limited by the outer diameter of the rotor seal device and cannot be arranged close to each other. The object of the present invention is to
It is to obtain a structure capable of eliminating the coolant hose to the rotor seal device. Still another object of the present application is to provide a machine tool in which a coolant is supplied to a main shaft, in which an axial distance between the rotary shaft and another rotary shaft can be set narrower than that of a conventional machine tool.

[0004]

Means for Solving the Problems To solve the above problems,
In the present application, the coolant is directly supplied from the coolant passage provided in the main body of the machine tool to the rotor seal device, and the piping hose to each rotor seal device is eliminated. Also, the fixed part is fixed to the main body, the rotating part is completely separated from this fixed part so that it is not rotatably supported by the fixed part, and both are liquid-tightly pressed to supply the coolant to the main shaft via the rotor seal device. A machine tool that can be configured with a rotor seal device that has a large outer diameter and does not require a bearing that has a large outer diameter is applied to the rotating main shaft to reduce the axial distance from other rotating shafts. did.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a machine tool in which a main shaft and an input shaft for transmitting a driving force to the main shaft are juxtaposed with each other. The fixed part is integrally attached to the end, and the fixed part is provided on the main body on which the main shaft is supported on the same axis as the rotating part and separately behind the rotating part. A rotor seal device that pressurizes liquid-tightly relative to a sliding contact member so that it can rotate relative to the main shaft, and supplies the coolant supplied to the fixed part to the main shaft via the rotating part, and the fixed part is fixed to the main body provided with the fixed part. A coolant channel communicating with the above is provided.

[0006]

EXAMPLE An example of the rotor seal device of the present application will be described with reference to FIGS. The gang head 1 shown in FIG. 1 is attached to a turret device (not shown),
The gang head 1 has a main body 2 of the gang head 1 on which a plurality of main shafts 4 each having a cutting tool 3 are rotatably supported by bearings. Also, the rear wall 5 of the main body 2
A coolant channel 6 is provided in the. A rotor seal device 7, which will be described later, is interposed between the rear wall 5 of the main body 2 and the rear end of the main shaft 4. The main body 2 also has an input shaft 8 juxtaposed to the main shaft 4 and connected to a drive motor (not shown). The input shaft 8 projects rearward from the rear wall 5 of the main body 2. The input shaft 8 transmits the rotational force of the drive motor to each main shaft 4 via an appropriate gear train to rotate the main shaft 4. Reference numeral 9 is a guide bar device having a bush 10 for positioning and guiding the cutting tool 3 during machining of the work, and moves the bush 10 back and forth relative to the main body 2.

The rotor seal device 7 is composed of a rotating portion 11 and a fixed portion 12, as shown in FIG. FIG.
As shown in FIG. 5, the rotating portion 11 has a screw portion 13 formed by screwing a screw on the outer periphery of the front portion. A wrench grip surface 14 is provided on the outer periphery of the rear portion so as to face the wrench grip portion 1.
5 are formed. A stepped hole 16 is formed in the rotating portion 11, and a large diameter hole 17 of the stepped hole 16 is formed.
A ring-shaped sliding contact member 19 made of ceramic, which is a material having good wear resistance, is fitted and protrudes from the rear end surface 21 of the rotating portion, and the inner peripheral surface 20 of the sliding contact member 19 and the stepped hole 16 are The coolant passage 22 is configured with the small diameter hole 18.

As shown in FIG. 4, the fixed portion 12 is composed of a fixed member 23 and a biasing member 24. Fixed member 2
3, an insertion hole 26 into which a spring 25 for urging the urging member 24 is inserted is formed in the front surface, and a projecting portion 27 projects from the rear end surface 46. The longitudinal center of the outer peripheral surface of the fixing member 23 is notched on both sides to accommodate the head of the bolt 28 in the recess 29.
Is formed, and an insertion groove 30 through which the bolt 28 is inserted is provided at the rear end portion, and the recess 29 and the insertion groove 30 form a bolt attachment portion 31. Further, the fixing member 23 is provided with a stepped hole 32. The urging member 24 has a shape in which a disc is vertically integrally formed on the outer periphery of a cylinder,
A sliding contact member 38 similar to the sliding contact member 19 is fitted into the large diameter hole 36 of the stepped hole 35 formed in the biasing member 24 and protrudes from the biasing member distal end surface 40. Rear part 4 of the biasing member 24
1 is inserted into the large diameter hole 33 of the stepped hole 32 so as to be movable in the axial direction, a bolt 43 is inserted through the vertical wall 42, and the bolt 43 is screwed into the insertion hole 26.
The spring 25 is interposed between the insertion hole 26 and the vertical wall 42. The bolt 43 guides the biasing member 24 in the front-back direction,
The biasing member 24 is prevented from rotating around the fixing member 23. The inner peripheral surface 39 of the sliding contact member 38, the small diameter hole 37 of the stepped hole 35, and the stepped hole 32 form a coolant passage 44 of the fixed portion 12.

The rotating part 11 is provided on the rear part of the main shaft 4 by the rotating part 1.
The wrench grip portion 15 of No. 1 is screwed in until it comes into contact with the rear end of the main shaft 4 and attached integrally, and the coolant passage 22 of the rotating portion and the coolant passage 45 of the main shaft 4 are continuous. In the fixed portion 12, the rear end surface 46 of the fixed portion 12 abuts on the rear wall 5 of the main body 2 of the gang head 1, and the protrusion 27 is fitted into the rear wall 5 so that the coolant channel 6 in the rear wall 5 is formed. The coolant passage 44 of the fixed portion 12 is attached so as to be continuous with each other, and is fixed by the bolt 28 attached to the bolt attachment portion 31. The sliding contact member 38 provided at the tip of the fixed portion 12 is urged forward and pressed against the sliding contact member 19 at the rear end of the rotating portion 11 on the same axis in a liquid-tight manner so as to be rotatable relative to each other, and the coolant passage 22 is formed. And the coolant flow passage 44 are continuous, and the coolant flow passage 6 of the rear wall 5 to the coolant flow passage 45 of the main spindle 4 are communicated with each other, so that the coolant is supplied to the cutting tool 3 at the tip of the main spindle 4. It becomes possible to lubricate the cutting edge with a shaft center. When the sliding contact members 19 and 38 are worn, the bolt 28 is removed, the biasing member 24 is pressed against the fixed member 23 side, the protruding portion 27 is pulled out from the rear wall 5, the fixed portion 12 is removed, and the rotating portion 11 is removed from the main shaft 4. , Replace with a new one.

Since the rotor seal device having no bearing is provided between the main body of the machine tool and the spindle, the life of the rotor seal device is extended without being restricted by the bearing life as in the conventional device, so that the rotor seal device Exchanges can be reduced and running costs are reduced.
Also, by using a rotor seal device without bearings, the protruding length of the rotating part to the rear of the main shaft can be made shorter than before, and vibrations due to rotation of the rotating part can be suppressed. As it disappears, assembly work becomes easier.

[0011]

As described above, according to the present invention, since the coolant is supplied to the rotor seal device from the passage provided in the main body, it is possible to eliminate the direct hose piping to the rotor seal device. There is no need to worry about handling the hose, and replacement work of the rotor seal device becomes easy.

Further, since the rotor seal device having no bearing is applied to the rear of the main shaft, the outer diameter of the rotor seal device is small, so that the main shaft and other rotary shafts (driving shaft, other rotary main shaft) are The inter-axis distance can be made narrower than in the past, and it is possible to machine a machining hole closer to the conventional hole in a machined work.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a main body to which a spindle is attached.

FIG. 2 is a plan view of a rotor seal device.

FIG. 3 is a sectional front view of a rotating portion.

FIG. 4 is a sectional front view of a fixed portion.

FIG. 5 is a V view of FIG. 4;

[Explanation of symbols]

2 Main body 4 Main shaft 6 Coolant flow path 7 Rotor seal device 8 Input shaft 11 Rotating part 12 Fixed part 25
Spring

Claims (1)

[Claims] 1. In a machine tool in which a main shaft and an input shaft for transmitting a driving force to the main shaft are arranged in parallel, a rotary part of a rotor seal device including a rotary part and a fixed part is integrally attached to a rear end of the main shaft, The fixed portion is provided on the main body on which the main shaft is supported on the same axis as the rotating portion and separately behind the rotating portion, and the sliding contact member at the rear end of the rotating portion and the sliding contact member at the front end of the fixed portion are liquified. It constitutes a rotor seal device that presses closely and relatively rotatably and supplies the coolant supplied to the fixed part to the main shaft via the rotating part, and the coolant flow for communicating with the fixed part to the main body provided with the fixed part. A machine tool having a rotor seal device characterized by having a passage.