JP2002187010A - Control unit for work end part operating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence of an accident that a revolving cutting tool collides with a work end part at a high speed, in a work end part operating machine operating an end part of a work W with a revolving cutting tool 4A capable of moving to and away from the work end part. SOLUTION: As a cutting operation speed at which the revolving cutting tool 4A is advanced from a zero return position P1 during cycle operation to the work end part, an advancing high speed, an advancing low speed and cutting speed are set. During the cutting operation of the tool 4A for a first work W, the tool 4A is advanced at the advancing low speed until a speed switching-over position P2 adjacent to the work end part, and then advanced until a cutting completion position P3 at the cutting speed switched-over. During the cutting operation of the tool 4A for a work W after that, the tool 4A is advanced at an advancing high speed until the speed switching-over position P2, then advanced until the cutting completion position P3 at the cutting speed VC switched-over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work end processing machine for processing an end of a work held in a fixed position by a rotary cutting tool capable of moving forward and backward with respect to the work end. The present invention relates to a control device for moving a cutting tool forward and backward.

[0002]

2. Description of the Related Art This type of work end processing machine is used for performing a chamfering process on a peripheral edge of a rod-shaped work cut to a predetermined length in a preceding stage cutting machine or a cutting finishing process of the end surface itself. used. In such a work end processing machine, generally, a clamp means for clamping an outer periphery of a work and holding the work in a fixed position is provided, and the work is clamped at both ends of the work to fix the work. A robot hand for automatic setting is installed in the clamp means.However, the robot hand for carrying in the workpiece and the rotary cutting tool at the origin return position during the machining cycle do not interfere with the end of the workpiece held by the clamp means. The origin return position of the rotary cutting tool is set at a position separated by a sufficient margin from the section.

[0003] Therefore, in this type of work end processing machine,
When the rotary cutting tool is moved forward from the home position for machining the end of the work, the home return is performed at a forward speed of the rotary cutting tool when actually cutting the work end, that is, at a low cutting speed. Moving the rotary cutting tool forward from the position to the cutting end position for the workpiece end requires a very long time while the rotary cutting tool moves in the idle (air cut) section until it reaches the workpiece end. Time becomes very long. Therefore, the forward speed of the rotary cutting tool is increased to a high speed from the home position to the position just before the end of the work, and thereafter, the rotary cutting tool is controlled to move forward at the cutting speed to perform cutting. I have.

[0004]

However, when the setting of the finished length of the work to be handled is erroneously set short, or when the actual length of the work to be carried in is much longer than an assumed value, or Due to a change in the setup of the rotary cutting tool, etc., the rotary cutting tool, which is moving forward from the home position at a high forward speed, collides with the end of the workpiece before being switched to the cutting speed, and the workpiece is clamped by the collision energy. Or a rotary cutting tool, and as a result, there is a fear that a fatal accident may occur, such as misalignment of the workpiece in a subsequent machining cycle.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control device for a work edge processing machine which can solve the above-mentioned conventional problems. In reference to the reference numerals of the embodiment, the end of the work W held at the fixed position P is processed by the rotary cutting tools 4A and 4B capable of moving back and forth with respect to the work end. The rotary cutting tools 4A, 4
A control device 10 for moving the rotary cutting tool B back and forth, and as a cutting process speed for moving the rotary cutting tools 4A and 4B forward from the home position P1 during the machining cycle toward the end of the work, a high forward speed VH. And low forward speed VL
And the cutting speed VC are set, and in the cutting process of the rotary cutting tools 4A and 4B for the first work W after the start of the machining cycle, the rotary cutting tools 4A and 4B are moved forward at a low forward speed VL until immediately before the end of the work. After that, the speed is switched to the cutting speed VC and is moved forward to the cutting completion position P3.
In the subsequent cutting process of the rotary cutting tools 4A and 4B for the workpiece W, the rotary cutting tools 4A and 4B are moved forward at a high forward speed VH until just before the end of the workpiece, and then switched to the cutting speed VC to complete the cutting. It is configured to perform control so as to move forward to the position P3.

More specifically, the control device of the present invention is implemented by changing the work finishing length WL and the cutting section length for moving the rotary cutting tools 4A and 4B forward to the cutting completion position P3 at the cutting speed VC. The corresponding cutting amount CL is set, and the rotary cutting tools 4A, 4A, and 4C in the cutting process are set on the basis of the set work finish length WL, the cutting amount CL, and the home position P1 during the machining cycle.
The speed switching position P2 for switching the forward speed of 4B to the cutting speed VC and the cutting completion position P3 can be configured to be calculated and determined. Further, in this case, a configuration may be adopted in which a correction value Cδ for correcting the cutting completion position P3 back and forth can be set.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a clamping means for clamping an outer central portion of a rod-shaped workpiece W in an axial direction. The reference vice jaw 2 has a fixed position, and the moving vice jaw 3 moves toward and away from the reference vice jaw 2 in the horizontal direction. 4A, 4B
Is a set of rotary cutting tools, front and rear, which are located on both front and rear sides of the workpiece W to be clamped by the clamping means 1.
One set of movable bases 5 supported movably in the axial direction of
A and 5B are detachably mounted on tool drive shafts 6A and 6B supported concentrically with the work W, and the work W
And chamfering of the end face and cutting and finishing of the end face.
The tool drive shafts 6A and 6B are rotationally driven at predetermined cutting speeds by rotational drive motors 7A and 7B mounted on the movable tables 5A and 5B. The two movable tables 5A and 5B are driven forward and backward in synchronization with each other at a predetermined speed by forward and backward drive feed screw means 9A and 9B driven forward and backward by motors 8A and 8B, respectively.

A control device 10 comprising a microcomputer, a programmable controller and the like includes a controller 11 of the clamping means 1,
Controllers 12A, 12B for rotary drive motors 7A, 7B of A, 4B, and controllers 13A, 1 for forward / backward drive motors 9A, 9B of movable tables 5A, 5B.
3B and the like, in addition to various setting data input from the operation panel 14, for example, pulse encoders 15A and 15B interlocked with the forward and backward drive motors 8A and 8B of the movable tables 5A and 5B.
B, etc., the current position information of each of the rotary cutting tools 4A, 4B (movable tables 5A, 5B) and, for example, incorporated in the controllers 12A, 12B of the rotary drive motors 7A, 7B of each rotary cutting tool 4A, 4B. There is provided storage means having a control program for performing automatic control based on overload detection signals obtained from the overload detection meter relays 16A, 16B and the like.

In FIG. 2, P is a fixed position corresponding to the center position in the axial direction of the work W clamped by the outer diameter by the clamping means 1, and P0 is a pair of rotary cutting tools 4 in front and rear.
A, 4B is the retreat limit standby position, and the movable tables 5A, 5B
Corresponds to the retreat limit position. P1 is the origin return position of each of the rotary cutting tools 4A and 4B at the time of the machining cycle, and the robot hand which grips both ends of the work W and carries the work W into the clamp means 1 is positioned at the position of the clamp means 1. When the W is released, it is set so as not to interfere with the rotary cutting tools 4A and 4B. Of course, this origin return position P
1 can be configured to be changeable according to the situation.

On the other hand, the length before processing WL + α of the work W carried into the work end processing machine is slightly longer than the finished length WL after the end is cut by the work end processing machine. Therefore, half α / 2 of the difference between the lengths is the actual machining allowance for both ends of the work W. In the cutting step in which the rotary cutting tools 4A and 4B move forward toward the workpiece W while the workpiece W is held at the fixed position P, the rotary cutting tools 4A and 4B The cutting speed is switched to a predetermined cutting speed at a position P2 which is slightly away from the end face of W by a clearance allowance x. Thereafter, each of the rotary cutting tools 4A and 4B cuts the cutting speed to a cutting completion position P3 at which the work W is finished to the finished length WL. To move forward.

As described above, each rotary cutting tool 4
The home position P1 of A and 4B is set in advance, the distance L between the home position P1 and the fixed position P is obvious, and the finished length WL of the work W and the length of the work W before machining are processed. Since WL + α can also be known in advance, if the escape margin x to be secured from the speed switching position P2 to the end face of the workpiece W is arbitrarily determined, the idling from the origin return position P1 to the speed switching position P2 (air The cut) section L1 can be obtained by an arithmetic expression L1 = L− (WL / 2) −x. The cutting section from the speed switching position P2 to the cutting completion position P3, that is, the cutting amount CL is calculated by the arithmetic expression CL = α / 2 + x, and the cutting process length LT of each of the rotary cutting tools 4A and 4B from the origin return position P1 to the cutting completion position P3 is L1 + CL.

When the target workpiece W for edge machining is determined,
Prior to starting the end processing of the work W, necessary data is input from the operation panel 14. Among the input setting data, setting data necessary in the system of the present invention is exemplified. The rotary cutting tools 4A, 4B in the cutting section from the workpiece finish length WL, the speed switching position P2 to the cutting completion position P3. Cutting speed VC, cutting amount CL corresponding to the length of the cutting section, and each rotary cutting tool 4A, 4B
High-speed forward speed V as the forward speed of the rotary cutting tools 4A and 4B during the machining cycle.
H (for example, 24 m / min) and the low forward speed VL (for example, 2 m / min) are set in the control device 10 in advance. Needless to say, any of these speeds VH and VL may be set to an arbitrary value from the operation panel 14, similarly to the cutting speed VC.

Before the actual machining cycle is started, each of the rotary cutting tools 4A and 4B is set to the retreat limit standby position P0.
Is moved forward to the origin return position P1, and waits at the origin return position P1. Hereinafter, the control procedure in the machining cycle will be described based on the flowchart of FIG.
The switching of the forward moving speed (high forward speed VH, low forward speed VL, cutting speed VC) of each rotary cutting tool 4A, 4B is performed by the control device 10 by driving the movable tables 5A, 5B forward and backward through the controllers 13A, 13B. Motors 8A, 8
B is performed by controlling the speed, and the timing of the speed switching is controlled by the pulse encoder 15A, which is linked with the forward / reverse drive motors 8A, 8B of the movable tables 5A, 5B.
Rotary cutting tools 4A, 4B obtained by 15B etc.
(Movable platform 5A, 5B) current position information and each position P1 to P
3 is determined by a comparison operation with the set position information corresponding to each of the three.

As described above, the work finish length WL, which is one of the known data which can be known in advance, the cutting amount CL which can be calculated from the known data, the material of the work W and the rotational cutting. When a cutting speed VC or the like, which can be determined based on empirical rules based on the characteristics and the like of the tools 4A and 4B, is input from the operation panel 14 (S1) and a setting end operation is performed, the speed switching position is calculated based on the above-described arithmetic expression. Each rotary cutting tool 4 in which P2 and the cutting completion position P3 are detected in real time based on the pulse encoders 15A, 15B and the like.
Computed and set as set position information that can be compared with the current position information (data) of A, 4B (movable stands 5A, 5B) (S2).

Next, when a machining cycle starting operation is performed on the operation panel 14 or the like (S3), the first work W is supplied to the clamp means 1 by the robot hand, and the clamp means 1 clamps the work W. When a series of work settings until the robot hand is held at the home position P and the robot hand retreats to the predetermined position is completed (S4), the rotary cutting tools 4A and 4B waiting at the origin return position P1 move the low-speed forward speed VL. To start the forward movement (S5). That is,
The movable tables 5A, 5B are driven by the forward and backward driving motors 8A, 8B.
B is driven forward at the low forward speed VL. Of course, each rotary cutting tool 4A, 4B is provided with a rotary drive motor 7A, 7B.
And is driven to rotate at a predetermined speed.

Each of the rotary cutting tools 4A and 4B has an arithmetic expression L1
= L− (WL / 2) −x, and when it reaches the speed switching position P2 after moving forward by the idle rotation (air cut) section L1 (S6), the forward moving speed of the rotary cutting tools 4A and 4B is low. The forward speed VL is switched to the cutting speed VC (S7). That is, the forward and backward drive motor 8A,
8B is speed-controlled, and the movable tables 5A and 5B are set at the cutting speed VC.
And the forward movement is continued. As a result, after moving forward from the speed switching position P2 by the clearance allowance x, each of the rotary cutting tools 4A and 4B starts cutting both ends of the work W held at the fixed position P by the clamping means 1.

Each of the rotary cutting tools 4A and 4B moves forward from the speed switching position P2 by the cutting amount CL at the cutting speed VC and arrives at the cutting completion position P3 (S8). / 2 cutting, length WL
The pre-processing work W of + α is finished into a work W (product) having a length WL. The rotary cutting tools 4A and 4B that have reached the cutting completion position P3 stop once and are switched to the backward movement, and return to the origin return position P1 at a predetermined backward movement speed (S9). That is, the forward and backward drive motor 8A,
8B is switched to the reverse rotation, and the movable tables 5A and 5B are driven backward at a predetermined backward moving speed until the rotary cutting tools 4A and 4B arrive at the home position P1.

One machining cycle for the first workpiece W is completed as described above, except for the case where the total number of machining cycles has been completed (the case where the processing of the predetermined number of works W has been completed) (S10). When a series of settings for the next work W is completed (S11), each of the rotary cutting tools 4A and 4B waiting at the home position P1 starts moving forward at a high speed forward speed VH (S12). That is, the movable platform 5 is driven by the forward / backward drive motors 8A and 8B.
A and 5B are driven forward at the high forward speed VH.

Thereafter, when each of the rotary cutting tools 4A, 4B moves forward by the idle rotation (air cut) section L1 and arrives at the speed switching position P2 (S6), each of the rotary cutting tools 4A, 4B.
The forward moving speed of B is changed from the high speed forward speed VH to the cutting speed VC.
(S7), and thereafter, the same control as that of the first work W described above is performed, and both ends of the second and subsequent works W are sequentially and automatically processed.
Then, when the processing of the predetermined number of works W is completed, that is, when the total number of processing cycles is completed (S10), a series of automatic control ends. At this time, it is also possible to control to automatically return the rotary cutting tools 4A and 4B from the home position return position P1 to the retreat limit standby position P0.

In the above control, the rotary cutting tool 4 which is moving forward to execute the end processing of the first work W due to a mistake in setting the finish length WL of the work W or the like.
Even if a situation occurs in which A and 4B collide with the end of the workpiece W before the cutting speed is switched to the cutting speed VC (before reaching the speed switching position P2), the rotary cutting tools 4A and 4B can
Since the workpiece W moves at a low speed forward speed VL lower than the high speed forward speed VH before the speed switching position P2 at the time of the end processing of the second and subsequent workpieces W, it is possible to prevent a fatal accident. Thus, when the rotary cutting tools 4A, 4B moving forward at the low forward speed VL collide with the end of the workpiece W, the motors 7A, 7B for rotating the rotary cutting tools 4A, 4B are overloaded. The overload state is detected by, for example, the meter relays 16A and 16B of the controllers 12A and 12B, and the motors 8A and 8B for driving the rotary cutting tools 4A and 4B (movable tables 5A and 5B) forward and backward are automatically stopped. The rotation driving motors 7A and 7B of the rotary cutting tools 4A and 4B can be automatically stopped after an appropriate time lag.

As described above, when a collision accident occurs between the rotary cutting tools 4A and 4B and the workpiece W during the end machining of the first workpiece W in the machining cycle, the input finishing length WL of the workpiece W is determined. Check and correct if there is an error. If there is no error, it means that the set value of the escape margin x entered during the calculation of the cutting amount CL is insufficient. Then, the cutting amount CL may be calculated again and the cutting amount CL may be input again. If the size of the rotary cutting tools 4A and 4B is considered to be the cause, the origin return position P1 is changed to adjust the distance L between the fixed position P of the work W (the clamp means 1) and the origin return position P1. Just do it.

Incidentally, as a result of actually executing the machining cycle,
The length of the obtained processed work W (product) and the end surface processing state are inspected. If the inspection result indicates that the processing allowance for the end of the work W is insufficient, a correction value + Cδ is input, and the processing allowance is excessive. , The correction value −Cδ is input. The correction value + Cδ is for negatively correcting the finish length WL of the work W input first, and the correction value −Cδ.
Is to positively correct the finish length WL of the work W input first. This correction value Cδ is
May be used as a correction machining allowance for the entire length of the rotary cutting tool 4A and 4B, so that a correction value for the rotary cutting tool 4A and a correction value for the rotary cutting tool 4A can be input separately. It is desirable. In this case, due to the characteristics of the robot hand that carries the work W into the clamp means 1, the problem caused by the axial center of the work W clamped to the outer diameter by the clamp means 1 being shifted from the fixed position P to the right or left is solved. Yes, or both rotary cutting tools 4A, 4
Due to the defect of the physical symmetry of B or the synchronism at the time of forward movement, it is possible to solve the problem that the positions of the processed both end faces become asymmetrical with respect to the fixed position P.

[0023]

The control device for a work edge processing machine according to the present invention can be implemented and used as described above. According to the control device according to the present invention, a preset low speed As long as the forward speed is set to a speed that does not lead to a fatal accident even if the rotary cutting tool collides with the end of the work at that speed, due to a mistake in setting the finished length of the work W, etc. When the rotary cutting tool reaches the speed switching position and switches to the cutting speed, an accident such as collision of the first edge of the workpiece occurs first. Since the tool is moved forward to the speed switching position, even if the above-mentioned collision accident occurs, the collision energy is small, and there is a possibility that the workpiece will be misaligned in a subsequent machining cycle. Specific not become an accident, it can be automatically stopped without any problem by overload automatic stop function or the like that are built conventionally.

In addition, when machining the second and subsequent workpieces, the rotary cutting tool is moved forward at a high speed to the speed switching position, so that the time required for moving in the idling (air cut) section can be shortened. As a result, the processing cycle time per work can be shortened, and the processing efficiency can be increased.

According to the second aspect of the present invention, the control of the present invention can be easily and easily executed, and according to the third aspect of the present invention, a workpiece whose end is actually processed. Even if there is an excess or deficiency in the end machining allowance, it is possible to easily and easily eliminate the excess or deficiency in the end machining allowance by inputting a correction value and obtain a desired processed product.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a work end processing machine and a block diagram illustrating a control system thereof.

FIG. 2 is a diagram illustrating a positional relationship between a workpiece held at a fixed position and a rotary cutting tool for edge processing, and control positions of the rotary cutting tool.

FIG. 3 is a flowchart illustrating a control procedure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Clamping means 4A, 4B Rotary cutting tool 5A, 5B Movable table 7A, 7B Motor for rotating drive of rotary cutting tool 8A, 8B Motor for moving forward / backward of movable table 10 Controller 14 Operation panel P Work holding fixed position P0 Rotary cutting Retreat limit standby position of tool P1 Home position return position of rotary cutting tool P2 Speed switching position of rotary cutting tool P3 Cutting completion position of rotary cutting tool CL Cutting amount (speed switching position P2 to cutting completion position P
3) L1 Idling section from the home position return position P1 to the speed switching position P2 VH High speed forward speed VL Low speed forward speed VC Cutting speed W Work WL + α Work length before machining WL Work finish length

Claims (3)

[Claims] In a work end processing machine for processing an end of a work held in a fixed position by a rotary cutting tool capable of moving back and forth with respect to the work end, the rotary cutting tool is moved forward and backward. A control device for moving, wherein a high-speed forward speed, a low-speed forward speed, and a cutting speed are set as a cutting process speed for moving the rotary cutting tool forward from a home position at a machining cycle toward a work end. In the cutting process of the rotary cutting tool for the first work after the start of the machining cycle, the rotary cutting tool is moved forward at a low forward speed until just before the end of the work, then switched to the cutting speed and moved forward to the cutting completion position. In the subsequent cutting process of the rotary cutting tool for the workpiece, the rotary cutting tool is moved forward at a high forward speed until just before the end of the workpiece, and then moved to the cutting speed. Rikae and to control so as to move forward to the cutting ending position Te, control device of a work end processing machine. 2. A work finishing length and a cutting amount corresponding to a cutting section length in which a rotary cutting tool is moved forward to a cutting completion position at a cutting speed are set. The speed change position at which the forward speed of the rotary cutting tool in the cutting process is switched to the cutting speed and the cutting completion position are calculated and determined based on the amount and the home position at the time of the machining cycle.
3. The control device for a work end processing machine according to claim 1. 3. The control device for a work edge processing machine according to claim 2, wherein a correction value for correcting the cutting completion position back and forth can be set.