JP2506979Y2 - Electric rotary processing unit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rotating machining unit for smoothly moving an electric rotating tool equipped with a rotating tool such as a drill, a tap, a brush and a grindstone.

[0002]

2. Description of the Related Art Conventionally, an electric rotary machining unit has a rotary drive unit for rotating a rotary tool such as a drill, and an advancing / retreating drive unit having an air cylinder. The rotary drive unit has a motor inside. The rotating tool is rotated, and the advancing / retreating drive means is configured to advance / retreat the rotational drive means in the axial direction. However, in the conventional electric rotary machining unit, since the advancing / retreating drive unit advances / retreats the rotary drive unit by the air cylinder, there are variations in the feed of the rotary drive unit depending on the surrounding conditions, air pressure, etc. Since it is difficult to position the rotating tool with respect to the workpiece, it takes time to position the rotating tool with respect to the workpiece. Therefore, an air cylinder is not used as the advancing / retreating driving means, for example, the actual open sho 61-1918.
No. 45, the first rotor and the first rotor of the motor 27.
A quill feed type spindle unit has been proposed in which the quill spindle is rotationally driven by the stator and the second rotor of the motor 36 and the second stator feed the quill spindle in the axial direction.

[0003]

However, since the spline shaft portion of the quill spindle is supported by the ball spline bush, there is a gap between the ball spline bush and the spline shaft portion, and when the quill spindle is rotated, runout occurs. There is also a problem in that the rotating tool that is mounted on the device also shakes. Also, because of the runout of the quill spindle,
There is also a problem that the stator may come into contact and be damaged. Furthermore, since the ball screw shaft of the quill spindle is rotated by the ball screw nut, there is a problem that the device becomes large. Further, it has a structure in which only the quill spindle is advanced and retracted, and when the quill spindle is advanced, it moves away from the bearing support point, so it is necessary to increase the diameter of the quill spindle in order to provide strength, and the entire device There is a problem that it is heavy and upsized. The present invention has been made in view of such circumstances, and the rotating tool does not swing, and the size is reduced.
It is an object of the present invention to provide an electric rotary processing unit that can be reduced in weight.

[0004]

A method according to the above-mentioned object.
The electric rotary processing unit described in the above is a rotary drive unit internally provided with a first electric motor for rotating a rotating tool such as a drill, a tap, a brush, a grindstone to be mounted, and one side capable of moving the rotary drive unit forward and backward. And a forward / backward drive means mounted on the other side of the tubular case to move the rotary drive section back and forth, and the rotary drive section and the forward / backward drive section are provided on the same axis. In the arranged electric rotation processing unit, the rotation drive unit includes a motor frame slidably mounted inside the tubular case, a stator fixed inside the motor frame, and an inside of the stator. A rotor fixed to the rotor, a spindle fixed to the rotor, and bearings on both sides for rotatably supporting the spindle on the motor frame. Mounted on the second electric motor, a ball screw shaft connected to the second electric motor via a coupling, and a ball socket screwed to the ball screw shaft. When,
The ball socket and the rotary drive unit are connected to each other, and a connecting member having a clearance hole into which the ball screw shaft fits inwardly is provided in the center, and a ball socket guide bar arranged parallel to the ball screw shaft. Moreover, the wiring of the first electric motor is spirally wired in the gap between the tubular case and the connecting member, and is connected to a power connector arranged in an outer intermediate portion of the tubular case, Further, upper and lower limit switches, which are connected to the ball socket and are actuated by a projection, a part of which protrudes outside the cylindrical case, are attached to the outside of the cylindrical case.

[0005]

According to the first aspect of the present invention, in the electric rotary machining unit, the rotary drive unit having the first electric motor for rotating the rotating tool such as the drill, tap, brush, or grindstone mounted therein has the tubular shape. The stator is fixed inside the motor frame that is slidably mounted inside the case, the rotor is arranged inside the stator, the spindle is fixed to the rotor, and the spindle is free to rotate on the motor frame by bearings on both sides. Mounted, and the rotator is attached to its spindle via a chuck. For this reason,
The position of the spindle is precisely determined and the distance between the rotor and the stator is kept to a minimum, which results in a strong rotational torque. Further, since the spindle is supported by the bearing, the rotation drive section has rigidity and the rotating tool does not shake even when the rotor is rotated. Further, since the rotary drive unit moves back and forth, the spindle does not protrude significantly, and a large bending moment is not applied to the spindle. Therefore, the diameter of the spindle may be small. The advancing / retreating driving means has a ball screw shaft connected to a second electric motor serving as a feed motor via a coupling,
For a pair of ball sockets, in which the ball socket is screwed to the ball screw shaft, and the ball socket and the rotary drive unit are connected by a connecting member having a clearance hole at the center into which the ball screw shaft is fitted, and which is arranged parallel to the ball screw shaft. Since it has a guide bar, when the second electric motor rotates, the ball screw shaft rotates, the ball socket moves back and forth along the ball socket guide bar, and the connecting member moves back and forth together with the ball socket. Move the rotary drive back and forth. At this time, the upper and lower limit switches are actuated by the projection connected to the ball socket, a part of which projects outside the tubular case, to control the range of movement of the ball socket. In this case, since the escape hole into which the ball screw shaft is fitted is formed in the connecting member, the size is reduced, and the second
Since the ball screw shaft is rotated by the electric motor, the size is further reduced. In addition, the projection connected to the ball socket by projecting a part of it to the outside of the cylindrical case, by changing the mounting position from the outside and changing the distance that hits the upper and lower limit switches,
It is also possible to adjust the forward limit and the backward limit of the rotating tool. The wiring of the first electric motor is spirally laid in the gap between the tubular case and the connecting member, and is connected to the power supply connector arranged in the outer middle portion of the tubular case, so that the rotating rotation The wiring of the drive unit is connected to the power connector.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a sectional view of an essential part of an electric rotary machining unit according to an embodiment of the present invention. As shown in FIG. 1, an electric rotary machining unit 10 according to an embodiment of the present invention includes an outer cylindrical case 11, a rotary drive unit 12 mounted on one side of the cylindrical case 11 so as to be movable back and forth, and a cylinder. On the other side of the case 11, there is provided an advancing / retreating drive means 13 which is mounted on the same axis as the rotary drive section 12 and moves the rotary drive section 12 back and forth. These will be described in detail below.

A bush 15 is provided at one end of the outer casing 11a of the tubular case 11, and the rotary drive unit 12 slides along the inside of the bush 15 and the outer casing 11a. Further, a power supply connector 25 is provided at an outer intermediate portion of the cylindrical case 11, and the first electric motor 1
Eight lead wires 24 are connected.

The rotary drive unit 12 is provided in the cylindrical case 1.
A motor frame 16 is slidably attached to one of the inner sides of the first electric motor 1, and a stator 16 a of the first electric motor 18 is fixed to the inner side of the motor frame 16. Stator 16
The rotor 16b is arranged inside a and the rotor 16b
A spindle 21 is fixed to the spindle 21, and front and rear ends of the spindle 21 are supported by respective bearings 19 and 20, and a mounting seat 30a for connecting the connecting member 30 is provided on the bearing 20 side. In this case, since the spindle 21 is directly fixed to the rotor 16b, the spindle 2
1 cannot be shaken. Further, a drill blade 23, which is an example of a rotating tool, is attached to the tip of the spindle 21 via a chuck 22, and the lead wire 24 of the first electric motor 18 is
Spiral wiring is provided in the gap between the cylindrical case 11 and the connecting member 30 of the advancing / retreating drive means 13, and the spiral case is connected to the power supply connector 25 arranged at the outer middle portion of the cylindrical case 11. Then, the rotation drive unit 12 is moved back and forth by pushing and pulling from the mounting seat 30a side by the forward and backward drive means 13. As described above, since the rotation drive unit 12 is moved back and forth, the rotation drive unit 12 has rigidity, and it is not necessary to increase the diameter of the spindle 21 in order to have strength.

The advance / retreat driving means 13 includes a cylindrical case 1
A second electric motor 26, which is a stepping motor that constitutes a feed motor, is provided on the other side of 1, and a base portion 27a of a ball screw shaft 27 is connected to a shaft 36 of the second electric motor 26 via a coupling 35. ing. The base 27a side of the ball screw shaft 27 is supported by a bearing 34 attached to the support member 17, and a flange 37 acting as a guide is provided at the tip of the ball screw shaft 27.
A ball socket 28 is screwed onto the ball screw shaft 27,
The through holes 38 and 39 of the ball socket 28 are respectively inserted into ball socket guide bars 31 and 32 which are parallel to the ball screw shaft 27 which is a pair on both sides, and a part of which is projected to the outside of the cylindrical case 11 on one side. Two protrusions 40, 40
a is provided. The projections 40 and 40a are provided on the support member 41 outside the cylindrical case 11 when the ball socket 28 moves back and forth along the ball socket guide bars 31 and 32.
The upper limit switch 42 and the lower limit switch 43, which are provided on both sides of, respectively, come into contact with each other. The ball socket guide bar 31,
One of the two 32 is screwed to the mounting portion 33 a, and the other is held by the support plate 33. Further, the ball socket 28 has a clearance hole 4 into which the ball screw shaft 27 is fitted.
It is connected to the mounting seat 30 a of the rotary drive unit 12 via the connecting member 30 having the number 4. Then, when the second electric motor 26 rotates, the ball screw shaft 27 rotates, and the ball socket 28 becomes the ball socket guide bars 31, 32.
The connecting member 30 moves back and forth together with the ball socket 28 to move the rotary drive unit 12 forward and backward. The electric rotary machining unit 10 is
Since the rotation drive unit 12 and the advancing / retreating drive unit 13 are arranged on the same axis, the size and weight can be reduced.

Next, a method of using the electric rotary machining unit 10 according to the embodiment of the present invention will be described with reference to FIG. The electric rotary machining unit 10 is attached to a part of the machine tool via a support member. First, the second electric motor 26 is energized and driven, the ball screw shaft 27 is rotated to advance the ball socket 28 along the ball socket guide bars 31 and 32, and the rotary drive unit 12 is advanced to advance the drill blade. 23 is moved to a predetermined position. In this way, the drill blade 23 can be easily positioned at a desired position on the workpiece.
Then, after positioning, the first electric motor 18 is energized while being fed by the second electric motor 26 to rotate the drill blade 23 and cut the object to be processed. When the cutting process is completed, the second electric motor 26 is reversely rotated to retract the rotary drive unit 12, and when the retract is completed, the first and second electric motors 18 and 26 are stopped. The rotation drive unit 12
When moving forward in all strokes of the ball socket 2
The protrusion 40 connected to 8 contacts the lower limit switch 43 to prevent unnecessary forward movement, and further, the protrusion 40a connected to the ball socket 28 when the rotary drive unit 12 retracts.
Contact with the upper limit switch 42 to prevent unnecessary retreat, so that the working operation can be performed safely. As described above, the electric rotary processing unit 10 rotates the ball screw shaft 27 by the second electric motor 26, advances the ball socket 28 screwed to the ball screw shaft 27, and advances the rotary drive unit 12. Therefore, it is possible to smoothly advance the rotation drive unit 12, and the positioning of the drill blade 23 with respect to the object to be processed is also accurate.

If necessary, the rotary drive unit 12 is advanced to a predetermined position and stopped, and the electric rotary machining unit 10 is stopped.
It is also possible to move the object in the horizontal direction and cut the object to be processed with the rotating drill blade 23. Further, although a drill blade is used as an example of the rotating tool, various rotating tools such as a tap, a brush, and a grindstone can be used as required. Although the stepping motor is used as the second electric motor, a servo motor having a rotary encoder or the like may be used.

[0012]

As is apparent from the above description, in the electric rotary machining unit according to the first aspect of the present invention, since the spindle for mounting the rotating tool is fixed to the rotor of the first electric motor, strong rotation is achieved. An electric motor having a torque can be formed, and the rotating tool is less likely to swing, which improves the processing accuracy. Furthermore, since the spindle does not swing, the stator and rotor do not come into contact with each other and are damaged as in the conventional case. Also, since the rotation drive unit is moved back and forth, there is no need to increase the diameter of the quill spindle as in the conventional case, and the connecting member of the drive unit is formed with an escape hole into which the ball screw shaft is fitted. Since the ball screw shaft is rotated by the second electric motor, it can be made smaller and lighter than the conventional one. The protrusion, a part of which protrudes to the outside of the cylindrical case and is connected to the ball socket, activates the upper and lower limit switches attached to the outside of the cylindrical case. Can be adjusted. The wiring of the first electric motor is
Since the wiring is spirally provided in the gap between the cylindrical case and the connecting member and is connected to the power supply connector arranged in the outer middle portion of the cylindrical case, the wiring of the rotary drive section that slides is connected to the power supply connector. It can be connected so that it can expand and contract without being exposed to the outside.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electric rotary machining unit according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric rotation processing unit 11 Cylindrical case 11a Outer cylinder 12 Rotational drive part 13 Rotation drive part 13 Forward / backward drive means 15 Bush 16 Motor frame 16a Stator 16b Rotor 17 Support member 18 1st electric motor 19 Bearing 20 Bearing 21 Spindle 22 Chuck 23 Drill blade 24 Lead wire 25 Power connector 26 Second electric motor 27 Ball screw shaft 27a Base portion 28 Ball socket 30 Connecting member 30a Mounting seat 31 Guide bar 32 Guide bar 33 Support plate 33a Mounting portion 34 Bearing 35 Coupling 36 Shaft 37 Collar 38 Through hole 39 Through hole 40 Protrusion 40a Protrusion 41 Support member 42 Upper limit switch 43 Lower limit switch 44 Relief hole

Claims (1)

(57) [Scope of utility model registration request] 1. A rotary drive unit internally provided with a first electric motor for rotating a rotary tool such as a drill, a tap, a brush and a grindstone to be mounted, and the rotary drive unit mounted on one side so as to be able to move forward and backward. An electric motor having a tubular case and an advancing / retreating drive unit mounted on the other side of the tubular case to move the rotational drive unit back and forth, and the rotational drive unit and the advancing / retreating drive unit are arranged on the same axis In the rotation processing unit, the rotation drive unit is disposed inside the tubular case so as to be slidable, a stator fixed to the inside of the motor frame, and arranged inside the stator. A rotor, a spindle fixed to the rotor, and bearings on both sides that rotatably support the spindle on the motor frame, and the rotating tool is mounted on the spindle via a chuck. The advancing / retreating drive means includes a second electric motor serving as a feed motor, a ball screw shaft connected to the second electric motor via a coupling, a ball socket screwed to the ball screw shaft, and the ball socket. And a connection member that connects the rotation drive unit and has a clearance hole at the center where the ball screw shaft is fitted inward,
A ball socket guide bar arranged parallel to the ball screw axis, and the wiring of the first electric motor is spirally wired in a gap between the tubular case and the connecting member, Upper and lower limits that are connected to a power connector arranged at an outer middle portion of the cylindrical case, are further connected to the ball socket, and are operated by a protrusion partially protruding outside the cylindrical case. An electric rotary machining unit, wherein a switch is attached to the outside of the cylindrical case.