JP2725782B2 - Work cutting method in sawing machine and sawing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for cutting a workpiece on a sawing machine and a sawing machine.

(Prior Art) Conventionally, a band saw blade provided on a band saw machine as a sawing machine is performing a cutting process on a work. A method of correcting the bending of the band saw blade when the bending of the band saw blade occurs during the cutting process. The following method is known.

In other words, the saw blade guide for guiding the band saw blade is inclined in the opposite direction to the bending of the band saw blade to correct the bending of the band saw blade, or the bending of the band saw blade is corrected by increasing the tension of the band saw blade. There is known a method, or a method of correcting the bending of the band saw blade by dulling a set blade on the bent side of the band saw blade.

(Problems to be Solved by the Invention) By the way, the cause of the bending of the band saw blade during the cutting processing of cutting the work by the band saw blade is as follows.
There are various things. In particular, when the cutting speed (either the saw speed or the cutting speed) is too high, when the hardness of the work is partially high, or when the band saw blade wears and the sharpness becomes dull. However, since the cutting conditions are too large, even if the above-described conventional bending correction method is employed, the bending of the band saw blade cannot be corrected.

Therefore, if the cutting of the workpiece is continued, a large bending occurs, and the cutting must be stopped.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned conventional problem of children, and the invention according to claim 1 is a method for cutting a workpiece by a saw blade provided on a sawing machine. Detecting the amount of bending of the saw blade and comparing the detected amount of bending with a preset set value, if the detected amount of bending is greater, the cutting speed of the saw blade with respect to the workpiece; Alternatively, it is a method of cutting a workpiece in a sawing machine in which at least one of the sawing speeds is reduced to continue cutting the workpiece, and the cutting is interrupted when the turning time reaches a set time.

According to a second aspect of the present invention, there is provided a bend detecting device that detects a bend of the saw blade during cutting of a workpiece by a saw blade in a sawing machine, and a detection value detected by the bend detect device is set in advance. When the detected value is compared with the set value and the detected value is larger than the set value, it functions to reduce at least one of the cutting speed or the saw speed of the saw blade with respect to the workpiece, and the turning time is set to the set time. And a comparator functioning to interrupt the cutting process when the cutting time is reached.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a horizontal band sawing machine 1 as an example of a sawing machine includes a box-shaped base 3 and a housing 5 of a saw blade which can be moved up and down with respect to the base 3. The saw blade housing 5 is pivotally supported on the base 3 by a hinge shaft 7 so as to be freely rotatable in the vertical direction. However, the configuration in which the saw blade housing 5 is mounted on the base 3 so as to be able to move up and down is not limited to the illustrated embodiment. A guide post is erected on the base 3 and the saw blade housing 5 is moved along the guide post. Can be raised and lowered.

The saw blade housing 5 is raised and lowered by the operation of a lifting cylinder 9 interposed between the base 3 and the saw blade housing 5. In the saw blade housing 5,
A drive wheel 11 and a driven wheel 13 around which an endless band saw blade B is wound are rotatably supported on rotating shafts 15 and 17, respectively.
19. When driven by a drive motor 23 such as a servo motor interlocked via a speed reducer 21, the band saw blade B is driven to perform a cutting operation.

The portion where the band saw blade B is located in the cutting action area (cutting portion) in the horizontal band saw machine 1 is slid by a pair of drive side guide members 25 and driven side guide members 27 as guide members so that the tooth tips point vertically downward. It is movably guided. The pair of drive-side guide members 25 and driven-side guide members 27 are appropriately mounted on the lower ends of the support arms 29 and 31, respectively, and the support arms 29 and 31 are located at the upper positions of the saw blade housing 5. It is supported by a fixed beam member 33 so that its position can be adjusted.

Further, in a portion of the cutting action region of the base 3, with the work table 35 are mounted for placing the workpiece W to be cut, a fixed vise for clamping fixing the workpiece W jaw 37 _f and the movable vise jaw 37 A vice device 37 having _m is mounted.

Therefore, when the saw blade housing 5 is lowered from the raised position, the band saw blade B running and driven by the drive wheel 11 cuts into the work W fixed on the work table 35 by the vice device 37. Becomes
The work W can be cut. Work W
The cutting speed of the band saw blade B with respect to
Can be controlled by appropriately controlling the lowering speed of the saw blade housing 5.

On one side of the driving guide member 25, a bending detecting device 39 including a displacement detector for detecting a displacement such as a twist or a bending of the band saw blade B is provided. The bending detecting device 39 is not limited to the displacement detector, but may be a non-contact bending detecting device using a proximity switch, and the mounting position may be provided on the driven-side guide member 27. Further, instead of detecting the twist of the band saw blade B, the bending detection device 39 may be configured to directly detect the bending state of the cut surface of the work W using a wire, a feeler, or the like.

The tip of the piston rod 41 of the lifting cylinder 9 is attached to the lower end of the saw blade housing 5. One end of a pipe 43 is connected to the cylinder chamber of the elevating cylinder 9, and the other end of the pipe 43 is a check valve.
It is connected to the B port of the electromagnetic directional control valve 47 at the 4-port 3-position through the 45. Solenoid for solenoid directional control valve 47
SOL ₁ and SOL ₂ are provided. One end of a pipe 49 is connected to the P port of the electromagnetic direction switching valve 47, and the other end of the pipe 49 is connected to the hydraulic pump 51. A drive motor 53 for operating the hydraulic pump 51 is operatively connected to the hydraulic pump 51.

One end of a pipe 55 is connected to the hydraulic pump 51, and the other end of the pipe 55 is connected to a filter 57. The filter 57 is connected to a tank 59.

The T port of the electromagnetic directional control valve 47 is connected to a tank 59 via a pipe 61. Further, one end of a pipe 63 is connected to a branch from the middle of the pipe 43, and a pressure control valve 67 having a spring 65 is connected to the other end of the pipe 63. One end of a pipe 69 is connected to the pressure control valve 67, and a flow control valve 73 having a flow control valve orifice shaft 71 is connected to the other end of the pipe 69. This flow control valve 73 has piping
One end of the pipe 75 is connected, and the other end of the pipe 75 is connected to the pipe 43.
Connected in the middle of.

With the above configuration, the hydraulic pump is driven by driving the drive motor 53.
Actuates solenoid 51 and solenoid of directional control valve 47
When SOL ₂ is activated, the pressure oil from the tank 59 is filtered by the filter 57,
The pressure oil flows to the pipe 43 via the pipes 55 and 49, and the pressure oil is supplied to the cylinder chamber of the lifting cylinder 9 via the check valve 45.

When the piston rod 41 of the lifting cylinder 9 is raised, the band saw blade B is raised via the saw blade housing 5.

When the solenoid SOL ₂ of the solenoid valve 47 is switched from the solenoid SOL ₂ to the solenoid SOL ₁ , the pressure oil in the cylinder chamber of the elevating cylinder 9 flows through the pipes 43 and 63, the pressure control valve 67, the flow control valve 73, and the pipe 75. It flows from the port to the T port, and is returned to the tank 59 via the pipe 61. When the piston rod 41 descends, the band saw blade B descends via the saw blade housing 5 and the work W is cut by the band saw blade B.

As shown in FIG. 2, the pressure control valve 67 and the flow rate control valve 73 drive a drive motor 77 such as a servomotor to thereby form a gear 79 connected to the drive motor 77 and a gear 79.
Are simultaneously controlled by the gear 81 meshed with. In addition,
As described above, the pressure control valve 67 and the flow control valve 73 may not only be controlled simultaneously, but also may be controlled separately by individual drive motors.

The saw speed and the cutting speed of the band saw blade B are controlled by the drive motor 2.
It is controlled by controlling 3,77 by respective control units. Moreover, the drive motors 23 and 77 are
3 is connected to the comparator 83, and the bending detecting device 39 is connected to the comparator 83.

To the comparator 83, the allowable bending amount C _S and the set time T _S as the set values are input in advance. The set time T _S is not the time from when the actual bend amount is detected by the bend detecting device 39 to when a signal is output, but the amount of bend detected during cutting is larger than the set value. This is the time from when the operation of the horizontal band saw machine 1 is stopped.

When cutting the work W with the band saw blade B, first,
Determining the cutting conditions, to set the cutting speed of the saw speed V _B and the feed speed V _C of the band saw blade B. The cutting process is started, and the actual bending amount is detected by the bending detecting device 39. The time interval of this bending detection is, for example, 10 seconds, and the set time T _S input in advance to the comparator 83 is 30 seconds.

Next, based on the flowchart of FIG.
The operation of the cutting method according to the above will be described.

In FIG. 3, in step S1, the sawing speed V _B and the cutting speed are set.
Set V _C, permissible switching curve amount of the set value in step S2
C _S and the set time T _S are input to the comparator 83 and set. Then
In step S3, the horizontal band saw machine 1 is operated, and cutting of the workpiece W is started by the freely movable band saw blade B.

In step S4, while the workpiece W is being cut by the band saw blade B, the bending amount C of the band saw blade B is detected by the bending detecting device 39. The turning amount C as the detected value is taken into the comparator 83, and the detected value C and the set value are inputted to the comparator 83.
It is compared with the C _S. If the actual bending amount C does not exceed the allowable bending amount C _S (C <C _S ), the process proceeds to step S5, where it is determined whether or not the cutting is completed, and it is determined that the cutting is not completed. Then, the process returns to the step before step S3, and if it is determined that the cutting process has been completed, the cutting process ends as it is.

If it is determined in step S4 that the actual bending amount C exceeds the allowable bending amount C _S (C> C _S ), the process proceeds to step S4.
Go to S6. In step S6, the cutting speed (one of the sawing speed V _B and the cutting speed V _C ) is reduced by, for example, 20% from before the detection of the bend, and the cutting process is continued in step S7.

As mentioned above, from the point when the cutting speed is reduced by, for example, 20%
After lapse of 10 seconds, again to detect the actual switching curve amount C in step S8, again compared with the set value C _S and the detected value by the comparator 83. If the amount of bending is not corrected (C>
C _S ), the turning time T as the elapsed time from the time when the cutting speed was first reduced in step S9 is compared with the set time T _S, and the turning time T has reached the set time T _S, for example, 30 seconds. If not, the process returns to the step S6, the cutting speed is reduced again by 20% in the step S6, and the cutting is performed in the step S7. After a lapse of 10 seconds from the point at which the cutting speed was again reduced by 20%, the detection value repeatedly detected in step S8 is repeatedly compared with the set value, and if it is determined that the bending is not corrected, step S9 is performed.
Then, the turning time T is compared with the set time T _{S. If} T = T _S , the horizontal band saw machine 1 is stopped in step S10 to interrupt the cutting.

If it is determined in step S8 that the bending amount has been corrected, the process returns to step S3, and the same processing is performed thereafter.

After the straightening, the cutting process is continued, and when the bending is performed again, the straightening of the bending is performed based on the above flowchart.

The saw speed V _B and the feed speed V _C of the cutting speed is not always necessary to change at the same rate may be changed only one of the saw speed V _B and the feed speed V _C.

As described above, during the cutting process in which the workpiece W is cut by the band saw blade B, the bending amount C is detected by the bending detecting device 39, and the actual bending amount C is determined by the comparator 83 to be the allowable bending amount. if it is determined that exceeds the amount C _S, switching bend can be corrected automatically by controlling so allowed to decrease the saw speed V _B is a cutting speed, at least one of the feed speed V _C, Can respond to unmanned operations.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. Although the present embodiment has been described using the horizontal band saw machine 1 as an example, the present invention can also be applied to a rigid band saw machine that moves by a frame or a table. Although the cutting speed has been described with reference to the cutting speed of the band saw blade (frame moving type), the cutting speed can also be adjusted to the work feeding speed (table moving type).

Further, after the straightening, if there is no bend for a predetermined time, the cutting speed can be increased to perform the cutting. Further, in order to correct the bending, when the cutting speed is reduced and the cutting process is completed, the cutting process can be performed by lowering the cutting speed from the beginning in the next cutting process.

[Effect of the Invention] As can be understood from the above description of the embodiment, the invention according to claim 1 detects the amount of bending of the saw blade during cutting of a workpiece by the saw blade provided on the sawing machine. Then, when the detected bending amount is larger than the detected bending amount by comparing the detected bending amount with a preset set value, at least one of the cutting speed or the saw speed of the saw blade with respect to the workpiece is set to This is a method of cutting a workpiece in a sawing machine in which cutting of a workpiece is repeated at a low speed, and the cutting is interrupted when a turning time reaches a set time.

According to a second aspect of the present invention, there is provided a bending detecting device (39) for detecting the bending of the saw blade during cutting of a workpiece by a saw blade in a sawing machine, and a detection detected by the bending detecting device (39). A value is compared with a preset set value, and when the detected value is larger than the set value, it functions to lower at least one of the cutting speed or the saw speed of the saw blade with respect to the workpiece, and the cutting function. Comparator (83) that functions to interrupt cutting when the bending time reaches the set time
And is provided.

As is apparent from the above configuration, in the present invention, the amount of bending of the saw blade is detected during the cutting of the workpiece, and the detected value is compared with a preset value. This is a configuration in which the cutting is continued by setting at least one of the cutting speed and the saw speed of the blade to a low speed, and the cutting is interrupted when the cutting time reaches a set time.

That is, according to the present invention, when the amount of bending of the saw blade during the cutting process is larger than the set value, the cutting process is not immediately stopped, and at least one of the cutting speed or the saw speed of the saw blade is reduced. Since the cutting process is continued, the cutting process is performed under loose cutting conditions, and the bending tends to be corrected naturally.

As described above, the cutting is not corrected even if the cutting operation is continued several times by reducing at least one of the cutting speed and the saw speed of the saw blade, and the cutting is not performed when the cutting time reaches the set time. It will be interrupted.

That is, the present invention, when detecting the bending of the saw blade larger than the set value, repeatedly reduce the cutting speed or the saw speed of the saw blade to correct the bending, if the bending time continues for the set time The cutting is interrupted, the working efficiency can be improved, and if the bending is not corrected, a large bending can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a horizontal band saw machine as a band saw machine according to an embodiment of the present invention, FIG. 2 is a schematic diagram of controlling a pressure control valve and a flow control valve by one drive motor, and FIG. FIG. 4 is a flowchart illustrating the operation of the present invention. 1 ... horizontal band saw machine, 5 ... saw blade housing 23 ... drive motor, 25 ... drive side guide member 39 ... bending detection device, 67 ... pressure control valve 73 ... flow control valve, 77 ... Drive motor 83 ... Comparator, B ... Band saw blade

Claims (2)

(57) [Claims] 1. A cutting edge of a saw blade is detected by a saw blade provided on a sawing machine during a cutting process of a workpiece, and the detected bending amount is detected by comparing it with a preset set value. When the amount of bending is greater, the cutting time of the workpiece is repeatedly set to at least one of the cutting speed or the sawing speed of the saw blade with respect to the workpiece and the workpiece is continuously cut to reach the set time. A method for cutting a workpiece on a sawing machine, wherein the cutting process is interrupted in some cases. 2. A bend detecting device (3) for detecting the bend of the saw blade during cutting of a workpiece by a saw blade in a saw machine.
9) and comparing the detected value detected by the bending detecting device (39) with a preset set value, and when the detected value is larger than the set value, the cutting speed of the saw blade with respect to the workpiece or the sawing speed. And a comparator (83) that functions to reduce at least one of the speeds and to stop cutting when the turning time reaches a set time. Sawing machine.