JPH11347873A - Work machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent failure of a work machining device when electric power supplied to a linear motor, a lifting/driving means of a ram, is cut off. SOLUTION: A work machining device is provided with a ram holding body 15 provided for a base substance, a ram 25 which is liftably provided for the ram holding body and rotatably holds a tool 28 for machining a work 6, a linear motor 39 placed between the ram holding body and the ram 25 and lifts the ram, an energizing means 29 placed between the ram and the ram holding body and energizes the ram upward, a cylinder device 42 provided on the ram holding body and connected with the ram and fluid 46 flowing in/out according to lifting of the ram, and a normally-closed solenoid valve 43 for stopping the flow of the fluid during shutdown of the linear motor. Therefore, when power supply of the linear motor 39 is cut off, the solenoid valve is closed to disturb the flow of the fluid, the cylinder device becomes in an un-operation condition, and lifting of the ram is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a biasing means for biasing a ram for rotatably holding a tool upward, and performs machining on a workpiece while moving the ram downward against the biasing means. The present invention relates to a work processing device for performing the work.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a cross section of a part of a conventional printed circuit board processing apparatus, which is an example of a work processing apparatus.

The bed 1 has a pair of linear guides 2 (one is not shown). The motor 3 is also fixed to the bed 1. The ball screw 4 is rotatably supported by the bed 1, and one end of the ball screw 4 is connected to the motor 3. The table 5 is supported movably in the x direction on the bed 1 by the linear guide 2, and a nut (not shown) is screwed to the ball screw 4 and connected to the ball screw 4. A printed circuit board (hereinafter, referred to as a board) 6 as a work includes:
It is fixed on the table 5.

[0004] The column 11 is erected vertically on the bed 1. The column 11 and the bed 1 are integrated into a base 10
Is formed. The column 11 and the bed 1 form a base. The pair of linear guides 12 is fixed to the column 11 laterally. The motor 13 is attached to the column 11. The ball screw 14 is rotatably supported by the column 11, and one end of the ball screw is connected to the motor 13. Saddle 15 as ram holder
Is supported on the column 11 by a linear guide 12 so as to be movable in the y direction, and a nut (not shown) is screwed to the ball screw 14 and connected to the ball screw 14.

A pair of linear guides 22 (one of which is not shown) is fixed to the saddle 15. The motor 23 is also fixed to the saddle 15. The ball screw 24 is rotatably supported by the saddle 15, and one end of the ball screw 24 is connected to the motor 23. Housing 25 which is a ram
Is provided on the saddle 15 so as to be movable in the z direction by a linear guide 22, and a nut 26 fixed to the back surface is screwed to the ball screw 24 and connected to the ball screw 24. The spindle 27 is fixed to the housing 25. The drill 28 is held at the tip of a main shaft (not shown) rotatably supported by the spindle 27 via a chuck. A spring 29, which is an urging means, urges the housing 25 upward to balance the weight of the housing 25 and supports the housing 25. The NC device 30 is a device that controls the motors 3, 13, 23, and the like, and is connected to a power supply having a voltage C shown in FIG.

Next, the operation of the conventional printed circuit board processing apparatus will be described.

The NC device 30 operates the motors 3 and 13 in accordance with a processing program input in advance, and first causes the drill 28 to face a predetermined position on the substrate 6. Thereafter, the motor 23 is operated to lower the housing 25 to a predetermined position against the spring 29. After drilling a hole in the substrate 6 with the drill 28, the housing 25 is raised.
The housing 25 is urged by the spring 29 and rises quickly to improve the working speed. Also, the housing 25
Is pushed up by the spring 29, the driving force of the motor 23 for raising the housing 25 can be reduced accordingly, and the motor 23 can be downsized.

[0008]

However, in recent years, it has been desired to further improve the drilling speed.

For this reason, a linear motor whose frictional resistance is so small as to be negligible is used instead of the ball screw 24 driven by the motor 23 as the means for vertically moving the housing 25. When a linear motor is used, the moving speed of the drill 28 in the z direction can be further increased.

In the case of the ball screw 24, the housing 25 does not move up or down due to screwing unless the screw is rotated. For this reason, even if the power is turned off, it is held at that position. However, in the case of the linear motor, since the linear motor can move up and down, when the power supply to the coil is cut off due to a power failure or the like, the housing 25 is pushed up by the spring 29 and collides with the saddle 15 to damage the spindle 27 or the saddle 15. There is fear.

An object of the present invention is to provide a work processing apparatus capable of preventing damage to the apparatus itself even when the power supplied to the ram lifting / lowering drive means is cut off.

[0012]

The above object is achieved by the following work processing apparatus.

A ram holder (1) provided on a base (10)
5), a ram (25) provided on the ram holder (15) so as to be able to move up and down and rotatably holding a tool (28) for processing a work, the ram holder (15) and the ram ( Lifting drive means for raising and lowering the ram (25) interposed between the ram (25) and the ram (25) upwardly interposed between the ram (25) and the ram holder (15). And a biasing means (29) for biasing, the lifting drive means is a linear motor (39), provided on the ram holder (15), and
5) a cylinder device (42) which is connected to the ram (25) and in which a fluid (46) flows in and out in response to the raising and lowering of the ram (25);
A normally closed solenoid valve (43) for stopping the flow of the fluid (46)
And characterized in that:

A ram holder (1) provided on a base (10)
5), a ram (25) provided on the ram holder (15) so as to be able to move up and down and rotatably holding a tool (28) for processing a work, the ram holder (15) and the ram ( E.g., a raising / lowering driving means interposed between the ram (25) and the ram (25), a control means (30) for controlling the raising / lowering driving means, the ram (25) and the ram holder (1).
5) a biasing means (29) for biasing the ram (25) upward by interposing the ram (25) upward, wherein the lifting drive means is a linear motor (39);
The ram (25) provided on the ram holder (15)
And the fluid (4) according to the elevation of the ram (25).
6) The fluid (46) while at least one of the power supplies M and C of the cylinder device (42) into and out of which the linear motor (39) and the control means (30) are off. And a normally closed solenoid valve (43) for stopping the flow of air.

(Operation) The operation of the former work processing apparatus.

The ram (25) is lowered or raised by the linear motor (39) against or accordingly to the biasing means (29). The linear motor (39) is a control means (30)
Stop and ascend / descend. The ram (25) is quickly moved up and down by the linear motor (39). For this reason, the work processing apparatus efficiently processes the work (6) by using the tool (28). When the ram (25) moves up and down, the cylinder device (42) connected to the ram (25) is operated, and fluid flows into and out of the cylinder device (42). As long as the power of the linear motor is not turned off, the solenoid valve (43) is open, and the fluid flows into the cylinder device (42).
Can flow in and out freely. Therefore, the cylinder device (42) does not prevent the ram (25) from moving up and down.

When the power supply M of the linear motor (39) is turned off, the solenoid valve (43) is closed. Therefore, the flow of the fluid (46) is stopped, and the cylinder device (42)
Cannot operate and restrain the ram (25) from moving up and down.

When the power of the linear motor (39) is turned off, the linear motor (39) does not control the movement (elevation) of the ram (25), and the ram (25) is controlled by the urging means (29). Try to be raised and lowered. However, the ram (25) is moved by the cylinder device (42).
Since the vertical movement is restricted, there is no possibility that the vertical movement is caused by the urging means (29).

Therefore, even if the power supply M of the linear motor (39) is turned off, the ram (25) will not be raised by the urging means and will collide with the ram holder (15). There is no. The ram (25) is restrained from moving up and down while the power of the linear motor (39) is off.

Operation of the latter work processing device.

Only the operation different from the operation of the former work processing apparatus will be described.

The linear motor (39) is controlled by the control means (3
0) to stop and move up and down to control the ram (25)
Up and down.

Linear motor (39) and control means (30)
When at least one of the power supplies M and C is turned off,
The solenoid valve (43) is closed.

Therefore, when either the power supply M of the linear motor (39) or the power supply C of the control means (30) is off, the ram (25) is opposed to the urging means (39). It is held in place (current position).

The symbols in the parentheses are given for comparison with the drawings, and do not limit the configuration of the present invention.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view of a main part of a printed circuit board processing apparatus according to an embodiment of the present invention. Also, FIG.
3 is different from the conventional printed circuit board processing apparatus shown in FIG. 3, other parts are omitted, and the same parts are denoted by the same reference numerals, and the description of the parts is omitted.

The coil 40 of the linear motor 39 is fixed to the back of the housing 25 and is connected to a power supply of a voltage M (hereinafter referred to as a power supply M). The magnet 41 of the linear motor 39 is fixed in a concave portion 15 a formed in the saddle 15 so as to face the coil 40. The cylinder device 42 includes a cylinder 42a and a piston rod 42b. The cylinder 42a is fixed to the upper part of the saddle 15, and the piston rod 42b is connected to the upper surface of the housing 25 through a hole 15b formed in the saddle 15.

One connection port of the normally closed two-way solenoid valve 43 is connected to a chamber A in a cylinder device 42 by a pipe 44.
The other connection port is connected to a chamber B in the cylinder device by a pipe 45. The coil 43a of the solenoid valve 43 is connected to a power source of a voltage S described below (hereinafter, referred to as a power source S). And chambers A and B,
The pipes 44 and 45 and the solenoid valve 43 are filled with pressure oil 46 as a fluid. The spring 43b shuts off the flow path in the solenoid valve 43 when the power supply S is off. The annular cushion 47 extends through the piston rod 42b and
It is attached to the upper and lower surfaces.

FIG. 2 is a wiring diagram of each electric component for each of the power supplies M, C, and S.

In FIG. 2A, a power source M includes a coil 40 of a linear motor 39 and a power switch 5 for the power source M.
2 are connected in series, and the coil 51 of the relay is connected to the coil 4
0 in parallel.

In FIG. 2B, the power supply C is connected to the NC device 30 and a power switch 54 for the power supply C in series, and the NC device 30 is connected to a relay coil 53 in parallel.

In FIG. 2C, a power source S
Power switch 56 and coil 43a of solenoid valve 43
The normally open contact switches 51a, 53a opened and closed by the relay coils 51, 53, and the coil 43a of the solenoid valve 43 are connected in series, and the relay coil 55 is connected in parallel to the coil 43a. ing. Coil 5
5, a not-shown contact connected to the control unit of the NC device 30 is connected.

Next, the operation will be described.

The power is not supplied to the coil 40 while the switch 52 is open and the power supply M is in the off state, so that the linear motor 39 exerts no force against the magnet 41. Therefore, the housing 25 is movable up and down, and is urged by the spring 29 to move upward. However, since the switch 56 and the contact 51a are open, the solenoid valve 43 is closed, and the flow of the pressure oil 46 is stopped. For this reason, the cylinder device 42 cannot be operated, and the housing 25 is stopped without moving up.

When the switch 54 is closed while the switch 52 is kept open, the NC device 30 is activated. In this state, the solenoid valve 43 is still closed, and the housing 25 is stopped.

Next, when the switch 52 is closed and power is supplied to the coil 40 of the linear motor 39, the NC device 30 controls the housing 25 so as to hold the housing 25 at the current position. In this state, the switches 51a and 53a are closed, but the switch 56 is open. Therefore, the solenoid valve 43
No current flows through the coil 43a, and the solenoid valve 43 stops the flow of the pressure oil in the closed state. Since the flow of the pressurized oil is stopped, the cylinder device 42 does not operate and restrains the housing 25 in the stopped state.

Next, when the switch 56 is closed, the solenoid valve 4 is closed.
A current flows through the third coil 43a, the electromagnetic valve 43 opens, and the pressure oil 46 can move, that is, the housing 25 can move in the vertical direction. The NC device 30 includes the coil 5
5, the state of a contact (not shown) operated by the controller 5 is monitored, and while the contact is closed, it is determined that the solenoid valve 43 is open, that is, the housing 25 is in a state capable of moving in the vertical direction. And stop control at a certain position.

The switches 52, 54, and 56 may be sequentially opened and closed manually, or may be automatically opened and closed sequentially.

After that, as in the conventional case, the drill 28 and the substrate 6 are relatively moved in the xy directions according to the machining program input in advance by the control of the NC device 30, and then the housing 25 is moved to the position z. 6 is processed.

When any one of the power sources M, S, and C is cut off due to a power failure or a break in the power cable, the solenoid valve 43 is immediately closed, and the housing 25 is held at that position.

After the operation is completed, the housing 25 is positioned at a predetermined position, and the switch 56 is opened. Then, the solenoid valve 4
3 closes and the pressure oil 46 cannot move. Even if the spring 29 urges the housing 25 upward, the housing 25 does not move.

As described above, in the present embodiment, the relay coils 51 and 53 and the switch 56 are provided, and the power supply M
Even if either S or C is cut off, the solenoid valve 43 is closed, the flow of the pressure oil 46 is stopped, and the housing 25 can be held at that position. Therefore, even when the linear motor is used as the lifting drive means of the housing 25, the housing 25 is not pushed up by the spring 29 and collides with the saddle 15. Solenoid valve 43 and cylinder device 4
2 is a safety device for the housing 25, so to speak. Further, since the relay 55 is provided, even if the coil 43a is damaged, it can be promptly restored.

When the force of the spring 29 is weak, the pressure oil 4
Air may be used as a fluid instead of 6. Further, the relay 55 does not always need to be provided.

Further, in the cylinder device 42, the piston rod 42b may be connected to the saddle 15, and the cylinder 42a may be provided in the housing 25.

The table 5 of the above-described printed circuit board processing apparatus is configured to move in the x direction, the saddle 15 is moved in the y direction, and the ram 25 is moved in the z direction. However, the present invention is not limited to this. , One of the table 5 and the saddle 15 is fixed, and the other is capable of moving in both the x direction and the y direction.

Further, in the above description, the printed circuit board processing apparatus has been described. However, the present invention is not limited to this, and includes a processing apparatus capable of processing another work.

[0048]

According to the work machining apparatus of the present invention, when the power of the linear motor or the power of the control means is turned off, the flow of the fluid is stopped by the normally closed solenoid valve, and the cylinder device is operated. Since the lifting and lowering of the ram is restricted so as not to be performed, the ram is prevented from being pushed upward by the urging means and colliding with the ram holder.

Therefore, it is possible to prevent the work processing apparatus, particularly the ram holder and the ram from being damaged.

[Brief description of the drawings]

FIG. 1 is a side view of a printed circuit board processing apparatus according to an embodiment of the present invention.

FIG. 2A is a wiring diagram for a power supply of a coil of a linear motor. (B) is a wiring diagram for the power supply of the NC device. (C) Wiring diagram for the power supply of the valve coil.

FIG. 3 is a perspective view showing a cross section of a part of a conventional printed circuit board processing apparatus.

[Explanation of symbols]

 C power supply (power supply of control means) M voltage, power supply (power supply of linear motor) S power supply 1 bed 5 table 6 printed circuit board (work) 10 base body 11 column 15 saddle (ram holder) 25 housing (ram) 28 drill (tool) 29) Spring (biasing means) 30 NC device (control means) 39 Linear motor (elevation drive means) 42 Cylinder device 42a Cylinder 42b Piston rod 43 Solenoid valve 43a Coil 43b Spring 44 Piping 45 Piping 46 Piping 46 Pressure oil (fluid)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16P 7/00 B23Q 1/08 Z

Claims (2)

[Claims] 1. A ram holder provided on a base, a ram rotatably provided on the ram holder and capable of rotatably holding a tool for processing a work, the ram holder being provided on the ram holder. A lifting / lowering drive unit interposed between the ram and the ram holding body, and a biasing unit for biasing the ram upward between the ram and the ram holding body; The lifting drive means is a linear motor, a cylinder device provided on the ram holder and connected to the ram, and a fluid inflow and outflow in response to the lifting and lowering of the ram; and a power supply of the linear motor is turned off. And a normally closed solenoid valve for stopping the flow of the fluid during the operation. 2. A ram holding body provided on a base, a ram rotatably provided on the ram holding body, the ram holding a tool for processing a work, and a ram holding body and the ram. Elevating drive means for elevating the ram interposed therebetween, control means for controlling the elevating drive means, and urging for urging the ram upward interposed between the ram and the ram holder And a cylinder device, wherein the lifting drive means is a linear motor, which is provided on the ram holder, is connected to the ram, and in which fluid flows in and out in response to the raising and lowering of the ram. And a normally closed solenoid valve for stopping the flow of the fluid while at least one of the power source of the linear motor and the control unit is in an off state.