KR101892174B1 - Drill processing apparatus using torque control - Google Patents

Abstract

To a drill machining apparatus using a torque control system. The drilling apparatus includes a jig unit, a Y-axis moving unit, at least one or more drill units, an X-axis moving unit, a torque sensor, and a controller. The jig unit fixes the workpiece. The Y-axis moving unit horizontally moves the jig unit in the Y-axis direction. The drill unit includes a drill bit for drilling the workpiece of the jig unit according to rotation operation while being vertically erected vertically from the upper side of the jig unit, a drill bit support mechanism for supporting the drill bit, And a drill bit elevation drive mechanism for moving the drill bit in the Z-axis direction by moving the drill bit rotation drive mechanism in the Z-axis direction. The X-axis moving unit horizontally moves the drill unit in the X-axis direction. The torque sensor measures the torque applied to the drill bit during drilling of the workpiece. The controller controls the drill bit rotation drive mechanism based on the torque measured from the torque sensor.

Description

[0001] The present invention relates to a drill processing apparatus using a torque control method,

The present invention relates to an apparatus for drilling an inner core of a vehicle part or the like.

Generally, a mount device for a vehicle transmission includes an inner core which is bonded to an insulator and joined to a frame of a vehicle body. The inner core can be fastened to the frame of the vehicle body by bolts. Therefore, the fastening holes for fastening the bolts are machined into the inner core.

In the process of drilling a hole or a tab into a workpiece such as an inner core of such a vehicle part, a defect in the machining dimension and a decrease in the productivity are caused by the fact that a cutting chip generated during drilling by the drilling machine smoothly One of the causes is the lack of emissions.

In this way, when the chip is not smoothly discharged from the workpiece and remains on the workpiece, the drill tool may be damaged, and the drive unit driving the drill tool may be overloaded, resulting in motor burnout of the drive unit. Therefore, the drill processing device needs to be configured to control the torque of the driving part by detecting an abnormal situation due to chip ejection failure during drilling.

A problem to be solved by the present invention is to provide a drill machining apparatus capable of preventing a trouble from occurring and preventing a defect of a workpiece.

In order to achieve the above object, a drilling apparatus according to the present invention includes a jig unit, a Y-axis moving unit, at least one or more drill units, an X-axis moving unit, a torque sensor, and a controller. The jig unit fixes the workpiece. The Y-axis moving unit horizontally moves the jig unit in the Y-axis direction. The drill unit includes a drill bit for drilling the workpiece of the jig unit according to rotation operation while being vertically erected vertically from the upper side of the jig unit, a drill bit support mechanism for supporting the drill bit, And a drill bit elevation drive mechanism for moving the drill bit in the Z-axis direction by moving the drill bit rotation drive mechanism in the Z-axis direction. The X-axis moving unit horizontally moves the drill unit in the X-axis direction. The torque sensor measures the torque applied to the drill bit during drilling of the workpiece. The controller controls the drill bit rotation drive mechanism based on the torque measured from the torque sensor.

According to the present invention, by measuring and controlling the load state applied to the drill bit due to a defect of chip discharge or an abnormality of a drill bit or the like during drilling of a workpiece by a torque sensor, And the defects of the workpiece can be prevented.

Further, according to the present invention, when a plurality of drill units are provided, two or more workpieces can be simultaneously drilled, and different types of drilling operations can be performed, thereby improving workability and production efficiency.

1 is a front view of a drilling apparatus according to an embodiment of the present invention.
Fig. 2 is a side view of Fig. 1. Fig.
Fig. 3 is a front view of the drill unit shown in Fig. 1; Fig.
Fig. 4 and Fig. 5 are views for explaining the operation of the replacement mechanism in Fig.

The present invention will now be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and a detailed description of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

1 is a front view of a drilling apparatus according to an embodiment of the present invention. Fig. 2 is a side view of Fig. 1. Fig. Fig. 3 is a front view of the drill unit shown in Fig. 1; Fig.

1 to 3, the drilling apparatus 100 includes a jig unit 110, a Y-axis moving unit 116, a drill unit 120, an X-axis moving unit 126, (130), and a controller (140).

The jig unit 110 fixes the workpiece. Here, the work piece may correspond to an inner core of a vehicle part such as a mount for a vehicle transmission. For example, the jig unit 110 includes a jig base 111, a jig block 112 mounted on the jig base 111 to seat the work, and a workpiece that is seated on the jig block 112, The clamper 113 may be provided with a plurality of protrusions. The clamper 113 may be configured to fix or unlock the workpiece to or from the jig block 112 as the clamping member is moved toward or away from the workpiece by the actuator for the clamper.

The Y-axis moving unit 116 horizontally moves the jig unit 110 in the Y-axis direction. For example, the Y-axis moving unit 116 may include a table 117, a Y-axis linear guide 118, and a Y-axis linear actuator 119.

The table 117 may be equipped with caster wheels 117a for movement at the lower end thereof. The Y-axis linear guide 118 guides the movement of the jig base 111 in the Y-axis direction on the table 117. The Y-axis linear guide 118 may include sliders fixed to the lower surface of the jig base 111 and linear rails fixed to the upper surface of the table 117 to guide the sliders movably in the Y-axis direction .

The Y-axis linear actuator 119 may include a rotary motor, a ball screw, and a Y-axis moving block. The rotary motor can be composed of a servo motor. The ball screws are arranged side by side in the Y-axis direction and fixed coaxially to the drive shaft of the rotary motor. The Y-axis moving block is screwed to the ball screw and fixed to the lower surface of the jig base 111. As the ball screw is rotated forward and backward by the rotation motor, the Y-axis moving block reciprocates in the Y-axis direction. Accordingly, as the jig base 111 moves in the Y-axis direction by the Y-axis moving block, the jig unit 110 can move in the Y-axis direction.

At least one drill unit 120 may be provided. The drill unit 120 includes a drill bit 121, a drill bit support mechanism 122, a drill bit rotation drive mechanism 123, and a drill bit lift mechanism 124. The drill bit 121 drills the workpiece of the jig unit 110 as the drill bit 121 rotates in a state where the tip of the drill bit 110 stands vertically with its tip end directed downward. The drill bit 121 is made of a drill bit and can process holes in the workpiece. Alternatively, the drill bit 121 may consist of a tab drill bit, which may thread the threaded tab within the hole of the workpiece.

The drill bit support mechanism 122 supports the drill bit 121. For example, the drill bit support mechanism 122 may include a spindle shaft 1221, a spindle housing 1222, and a chuck arbor 1223.

The spindle shaft 1221 is rotated by the drill bit rotation driving mechanism 123. The spindle shaft 1221 can rotate the drill bit 121 around the Z axis as it rotates about the Z axis. The spindle housing 1222 surrounds the spindle shaft 1221 and supports the rotation of the spindle shaft 1221. The spindle housing 1222 may be formed so as to surround the periphery of the spindle shaft 1221 with the upper and lower ends of the spindle shaft 1221 exposed. The spindle housing 1222 houses the bearings and can support the spindle shaft 1221 in a rotational manner. The chuck arbor 1223 is mounted to the spindle shaft 1221 through the lower end and fixes the drill bit 121. The chuck arbor 1223 is configured to attach and detach the drill bit 121, thereby facilitating the replacement of the drill bit 121.

The drill bit rotation drive mechanism 123 rotates the drill bit support mechanism 122. For example, the drill bit rotation drive mechanism 123 may include a rotary motor 1231, a drive pulley 1232, a driven pulley 1233, and a belt 1234.

The rotation motor 1231 may be a servo motor. The drive pulley 1232 is coaxially fixed to the drive shaft of the rotation motor 1231, and is rotationally driven by the rotation of the drive shaft. The driven pulley 1233 is disposed coaxially with the drill bit 121 and is fixed to the drill bit support mechanism 123. The driven pulley 1233 may be coaxially disposed with the spindle shaft 1221 and fixed to the upper end of the spindle shaft 1221. Belt 1234 transfers the rotational force of drive pulley 1232 to driven pulley 1233. Therefore, when the drive pulley 1232 is rotated by the rotation motor 1231, the driven pulley 1233 is rotated by receiving the rotational force of the drive pulley 1232 by the belt 1234. As a result, as the spindle shaft 1221 rotates, the drill bit 121 of the chuck arbor 1223 becomes rotatable.

The drill bit elevation drive mechanism 124 moves the drill bit 121 in the Z-axis direction as it moves the drill bit rotation driving mechanism 123 in the Z-axis direction. For example, the drill bit lifting and lowering drive mechanism 124 may include a post 1241, a Z-axis linear guide 1242, and a Z-axis linear actuator 1243.

The post 1241 may be fixed on the table 117. The Z-axis linear guide 1242 guides the movement of the drill bit rotation driving mechanism 123 in the Z-axis direction with respect to the post 1241. The Z-axis linear guide 1242 may include sliders fixed to the drill bit rotation driving mechanism 123 and linear rails fixed to the posts to guide the sliders movably in the Z-axis direction. The Z-axis linear actuator 1243 may include a rotary motor such as a servo motor, a ball screw, and a Z-axis moving block to move the drill bit rotation driving mechanism 123 in the Z-axis direction. The Z-axis linear actuator 1243 may be configured to transmit the driving force of the rotating motor to the ball screw by the pulleys and the belt, but may also directly transmit the driving force of the rotating motor to the ball screw.

The X-axis moving unit 126 horizontally moves the drill unit 120 in the X-axis direction. For example, the X-axis movement unit 126 may include a support bracket 1261, an X-axis movement bracket 1262, an X-axis linear guide 1263, and an X- The support bracket 1261 is fixed to the Z-axis moving block of the drill bit lift driving mechanism 124. The X-axis movement bracket 1262 is fixed to the spindle housing 1222. The X-axis linear guide 1263 may include sliders fixed to the support bracket 1261 and linear rails fixed to the X-axis movement bracket 1262 to guide the sliders so as to be movable in the X-axis direction.

The X-axis linear actuator 1264 can move the X-axis moving bracket 1262 in the X-axis direction, including a rotary motor such as a servo motor, a ball screw, and an X-axis moving block. As a result, as the X-axis moving bracket 1262 moves in the X-axis direction, the drill unit 120 can move in the X-axis direction. As another example, the rotation handle may be fixed to the ball screw instead of the servo motor, and the drill unit 120 may be moved in the X-axis direction as the operator manually rotates the handle.

The torque sensor 130 measures the torque applied to the drill bit 121 during drilling of the workpiece. For example, the torque sensor 130 is installed between the drive shaft of the rotary motor 1231 of the drill bit rotation driving mechanism 123 and the drive pulley 1232 to measure the torque of the drive pulley 1232 and provide it to the controller 140 can do. The torque sensor 130 may be a rotary torque sensor. In this case, the torque sensor 130 is coaxially fixed to the drive pulley 1232, and the torque can be measured by the strain gauge. Needless to say, the torque sensor 130 may be composed of various known torque sensors.

The controller 140 controls the drill bit rotation driving mechanism 123 on the basis of the torque measured from the torque sensor 130. For example, based on the torque measured from the torque sensor 130, the controller 140 determines whether or not a load applied to the drill bit 121 due to a defect in chip discharge or an abnormality in a drill bit, It is possible to stop the drill bit rotation drive mechanism 123 and notify the operator of the drill bit rotation driving mechanism 123 by an alarm or the like. Therefore, it is possible to prevent the occurrence of a trouble in the drilling apparatus 100 and to prevent the defect of the workpiece.

Meanwhile, the drill units 120 may be formed as a pair. The X-axis moving unit 126 can move the drill units 120 together in the X-axis direction. As another example, the X-axis moving unit 126 may move the drill units 120 individually.

The pair of drill units 120 can be moved up and down together in the Z-axis direction by the two drill bits 121 by one drill bit lifting and lowering mechanism 124. Of course, the drill units 120 may each include a drill bit lifting and lowering driving mechanism 124 so that each drill bit 121 can be independently lifted and lowered in the Z-axis direction.

The above-described drill units 120 can simultaneously drill two workpieces. Further, when drilling two workpieces, one drill unit 120 processes the holes in the workpiece and the other drill unit 120 processes the screw taps in the workpiece, Different types of drilling operations can be performed. Therefore, convenience of operation and productivity can be improved.

On the other hand, the drill bit support mechanism 122 may include a replacement mechanism 1224 that allows the chuck arbor 1223 to be interchangeable with respect to the spindle shaft 1221. For example, the replacement mechanism 1224 may include a pusher 1225, an arbor holding shaft 1226, an elastic member 1227, and an arbor holding clamp 1228. The pusher 1225 pushes down the arbor holding shaft 1226. The pusher 1225 may be configured to include an air cylinder. The air cylinder is arranged so that the cylinder rod ascends and descends with respect to the cylinder body. The air cylinder can press the arbor holding shaft 1226 down when the cylinder rod is lowered.

The arbor holding shaft 1226 is inserted into the spindle shaft 1221 through the upper end thereof and guided by the elevation shaft. The elastic member 1227 elastically biases the arbor holding shaft 1226 upward so that the arbor holding shaft 1226 returns to the original position when the pressing state is released from the pusher 1225. [ The elastic member 1227 is composed of a tension coil spring, and one end thereof may be fixed to the arbor holding shaft 1226 and the other end thereof may be fixed to the spindle shaft 1221.

The arbor holding clamp 1228 fixes the chuck arbor 1223 in a state where the arbor holding shaft 1226 is released from the pusher 1225 and retracted to the home position and the arbor holding shaft 1226 is lowered by the pusher 1225 The chuck arbor 1223 is released.

For example, the arbor holding shaft 1226 has a lower end stop 1226a. The chuck arbor 1223 has a top latching protrusion 1223a. The spindle shaft 1221 has a release groove 1221a on its inner wall. The release groove 1221a of the spindle shaft 1221 is disposed below the upper latching protrusion 1223a of the chuck arbor 1223 on the basis of the position where the chuck arbor 1223 is mounted.

The arbor holding clamp 1228 has an upper clamping protrusion 1228a and a lower clamping protrusion 1228b. The upper clamping protrusion 1228a is retained in the lower stopping hook 1226a of the arbor holding shaft 1226. [ The upper clamping protrusion 1228a is protruded so that the inner portion thereof is caught by the lower stopping jaw 1226a of the arbor holding shaft 1226. [ In addition, the upper clamping protrusion 1228a may have an inclined surface from the upper end toward the inner wall of the spindle shaft 1221. [ The lower clamping protrusion 1228b can be moved away from the release groove 1221a of the spindle shaft 1221 and smoothly rotated and inserted between the upper latching protrusion 1223a of the chuck arbor 1223 and the inner wall of the spindle shaft 1221 .

The lower clamping protrusion 1228b is caught by the upper latching protrusion 1223a of the chuck arbor 1223 in a state in which the arbor holding shaft 1226 is raised to the home position, and the chuck arbor 1223 is fixed, The chuck arbor 1223 is released from the upper latching protrusion 1223a of the chuck arbor 1223 to the release groove 1221a in the spindle shaft 1221 in the state of being lowered by the latch 1225. [

The lower clamping protrusion 1228b is formed such that the inner portion thereof is caught by the upper latching protrusion 1223a of the chuck arbor 1223. The lower clamping protrusion 1228b may be formed such that the outer portion of the spindle shaft 1221 toward the inner wall of the spindle shaft 1221 protrudes more than the central portion of the arbor holding clamp 1228. [ When the lower clamping protrusion 1228b moves upward from the release groove 1221a of the spindle shaft 1221 and the outer portion abuts the inner wall of the spindle shaft 1221, And can be rotated by the upper locking protrusion 1223a. The arbor holding clamp 1228 may be divided into a plurality and arranged along the circumference of the arbor holding shaft 1226. [

An example of the operation of the above-described replacement mechanism 1224 will be described with reference to FIGS. 4 and 5. FIG.

When the chuck arbor 1223 is to be mounted on the spindle shaft 1221, the arbor holding shaft 1226 is lowered by the pusher 1225 as shown in Fig. Then, the arbor holding clamp 1228 is lowered together with the arbor holding shaft 1226 since the upper clamping protrusion 1228a is caught by the arbor holding shaft 1226. [ At this time, the arbor holding clamp 1228 waits while the lower clamping protrusion 1228b is rotated to the release groove 1221a of the spindle shaft 1221. [ In this state, the chuck arbor 123 is inserted into the spindle shaft 1221 through the lower end. At this time, the upper latching protrusion 1223a of the chuck arbor 1223 is positioned above the lower clamping protrusion 1228b.

Then, the pressing state of the arbor holding shaft 1226 by the pusher 1225 is released. Then, as shown in Fig. 5, the arbor holding shaft 1226 raises the arbor holding clamp 1228 while returning to the home position by the elastic member 1227. [ At this time, the lower clamping protrusion 1228b is engaged with the upper latching protrusion 1223a of the chuck arbor 1223 to move the chuck arbor 1223 to the mounting position and at the same time, is released from the release groove 1221a of the spindle shaft 1221 It is possible to fix the chuck arbor 1223 at the mounting position by being sandwiched between the upper latching protrusion 1223a of the chuck arbor 1223 and the inner wall of the spindle shaft 1221. [

When the chuck arbor 1223 is to be separated from the spindle shaft 1221, the arbor holding shaft 1226 is lowered by the pusher 1225 as shown in Fig. Then, the chuck arbor 1223 is released from the state fixed to the arbor holding clamp 1226, and can be pushed down by the arbor holding shaft 1226 to be separated.

As described above, the chuck arbor 1223 can be replaced by the replacement mechanism 1224, so that when the type of drilling is changed, or when the drill bit 121 is worn or damaged, the drill bit 121 can be easily replaced So that the convenience of operation can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

110 .. jig unit 116 .. Y axis moving unit
120 .. Drill unit 121 .. Drill bit
122 .. Drill bit support mechanism 123 .. Drill bit rotation drive mechanism
124. Drill bit elevation drive mechanism 126..X axis movement unit
130 .. Torque sensor 140 .. Controller
1221 .. Spindle shaft 1222 .. Spindle housing
1223 .. Chuck Arbor 1224 .. Replacement Mechanism
1225 .. Pusher 1226 .. Arbor Holding Shaft
1227 .. Elastic member 1228 .. Arbor holding clamp
1231 .. Rotary Motor 1232 .. Drive Pulley

Claims (5)

A jig unit for fixing the workpiece;
A Y-axis moving unit for horizontally moving the jig unit in the Y-axis direction;
A drill bit for drilling the workpiece of the jig unit as the tip of the jig unit is rotated vertically with its tip end directed downward, a drill bit support mechanism for supporting the drill bit, And a pair of drill bit drive mechanisms for rotating the tool, and a drill bit lift driving mechanism for moving the drill bit in the Z-axis direction by moving the drill bit rotation driving mechanism in the Z- field;
An X-axis moving unit for horizontally moving the drill units in the X-axis direction;
A torque sensor for measuring a torque applied to the drill bit when drilling the workpiece; And
And a controller for controlling the drill bit rotation driving mechanism based on the torque measured from the torque sensor,
The jig unit includes:
A jig block for seating the workpiece, and
And a clamper for fixing or releasing the workpiece to or from the jig block as the clamping member is moved toward or away from the workpiece by the actuator for clamper,
The drill bit support mechanism includes:
A spindle shaft rotated by the drill bit rotation driving mechanism,
A spindle housing which surrounds the spindle shaft and supports the rotation of the spindle shaft;
A chuck arbor mounted to the spindle shaft via a lower end and fixing the drill bit,
And a replacement mechanism that allows the chuck arbor to be interchangeable with respect to the spindle shaft,
The X-axis moving unit includes:
A support bracket fixed to a Z-axis moving block of the drill bit lift driving mechanism,
An X-axis moving bracket fixed to the spindle housing,
And an X-axis linear actuator which moves the X-axis moving bracket in the X-axis direction under the guidance of the X-axis linear guide,
The drill bit rotation driving mechanism includes:
A rotation motor,
A drive pulley coaxially fixed to a drive shaft of the rotary motor,
A driven pulley coaxially disposed with the drill bit and fixed to the spindle shaft,
And a belt for transmitting rotational force of the drive pulley to the driven pulley;
Wherein the torque sensor is installed between a drive shaft of the rotary motor and a drive pulley, the shaft being coaxially fixed to the drive pulley and measuring a torque of the drive pulley by a strain gauge;
Wherein the controller stops the rotation motor and informs the operator by an alarm when it is determined that the load applied to the drill bit exceeds a set value based on the torque measured from the torque sensor. Used drilling machine. delete delete delete The method according to claim 1,
The replacement mechanism includes:
An arbor holding shaft which is inserted into the spindle shaft through an upper end thereof and is guided by an elevator,
A pusher for pushing down the arbor holding shaft,
An elastic member elastically biasing the arbor holding shaft upward so that the arbor holding shaft returns to the original position in a state in which the pressurized state is released from the pusher;
And an arbor holding clamp for fixing the chuck arbor in a state where the arbor holding shaft is released from the pusher and retracted to an original position and releasing the chuck arbor in a state in which the arbor holding shaft is lowered by the pusher Drill machining system using torque control method.

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