JPH0255167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting control method for a saw machine, and more specifically, detects the occurrence of overload cutting during cutting by a saw machine, inputs it to a computer, and separates the saw blade from the cutting part. Return the saw blade a certain distance, adjust cutting conditions to avoid overload, and re-cut. If overload cutting cannot be avoided even after performing the above re-cutting a certain number of times, move the saw blade away from the cutting part and issue an alarm. It concerns how to stop.

Conventional saw machines have a built-in computer that inputs and stores the conditions of the material to be cut, such as its material, shape, and dimensions, in advance, and then automatically adjusts the saw blade for each cutting length that changes depending on the saw blade traveling position during cutting. A saw machine has been devised that automatically controls the cutting operation by specifying either the moving speed or the cutting speed to prevent the cutting from bending.

However, even if the material to be cut is the same as described above, there is naturally a difference in hardness within the allowable limit, and the cutting performance of the saw blade itself gradually deteriorates due to wear etc. At high cutting speeds, overload cutting may occur.

The saw blade is a unique cutting tool with a thin thickness, and when overloaded cutting occurs, the saw blade tilts away from the direction of the cut, no matter how strong the tension is on both sides across the workpiece, and the end point of the cut is specified when the cut is completed. This resulted in the inconvenience of producing defective products with different lengths and shorter dimensions.

The present invention has been made to overcome the above-mentioned drawbacks, and preferred embodiments thereof will be described in detail with reference to the drawings.

FIG. 1 is a diagram illustrating an embodiment of the present invention regarding a so-called vertically descending type horizontal band saw machine 1. Band saw blades 5, which are wound around the left and right wheels 3, are circulated by an electric motor 7 to hold the wheels 3. The housing 9 is driven by a hydraulic cylinder 11 to move the band saw blade 5 toward and away from the material 13 to be cut, thereby performing cutting work.

The band saw machine of this embodiment has a drive device 1 surrounded by a broken line.
5, cutting speed control device 17, and computer 1
9.

The drive device 15 switches the pressure oil from the pump 21 using the electromagnetic switching valve 23 to cause the housing 9 of the bandsaw machine to assume three states: upward movement, rapid downward movement, and stop.

The cutting speed control device 17 includes a flow rate control valve 25 that can be adjusted according to a command from a computer and an electromagnetic switching valve 27. When the drive device 15 is in a stopped state, the electromagnetic switching valve 27 is opened. band saw blade 5
The cutting speed can be set.

The computer 19 has a function of counting the number of repetitions of re-cutting and determining whether or not a preset number of times has been reached. The input device 29 is a device for inputting the material, shape, dimensions, and allowable number of recutting repetitions of the material to be cut 13, and the storage device 31 is a device for storing and accumulating these input data.

The comparison/judgment device 33 receives load information from a device 37 that detects the amount of load based on the back pressure or displacement of the band saw blade 5, and compares it with the load corresponding to the standard cutting speed from the storage device 33 described above. Based on the judgment of the comparison judgment device 33 described above, the command device 35 increases the moving speed of the saw blade, reduces the flow rate by tightening the flow control valve 25, or performs overload cutting. This is a device that issues a command to the drive device 15 to raise the housing by 20 mm, for example.

As explained above, in the embodiment of the saw machine adopting the method of the present invention, the saw blade is moved away from the cutting part by a predetermined distance, such as 20 mm, based on overload information detected during cutting. By increasing or decreasing at least one of the moving speed of the saw blade and the descending speed (cutting speed) of the housing to avoid overload and perform re-cutting, bending of the cut can be prevented. For example, if the cutting cycle is repeated three times and a fourth overload is detected, the 20mm saw blade will be raised and stopped as described above, and an alarm will be issued at the same time. To prevent the occurrence of defective products due to cut bending by automatically responding flexibly to the situation even when the saw blade has abnormally high hardness or the cutting performance has deteriorated due to wear of the saw blade. This makes it possible to overcome the disadvantages of conventional methods.

In the above-described embodiment, the housing 9 is raised and lowered by the hydraulic cylinder 11, but a screw feed may also be used. Alternatively, it is obvious that it is possible to detect an abnormal increase in the current consumption of the electric motor 7 for driving the saw blade, in addition to detecting the amount of position that takes a detour.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the method of the present invention. Explanation of symbols representing main parts in the drawings, 1...
Horizontal bandsaw machine, 15... Drive device, 17... Cut speed control device, 19... Computer, 29... Input device, 31... Storage device, 33... Comparison/judgment device, 35... Command device, 37 ...Overload detection device.

Claims (1)

[Claims] 1. During cutting at the cutting speed specified by the computer, the occurrence of overload cutting is detected and inputted to the computer, and the cutting is interrupted and the saw blade is moved away from the cutting part and returned a certain distance, and at least the saw blade is Perform re-cutting by adjusting either increasing the moving speed or decreasing the cutting speed, and after repeating the above-mentioned re-cutting a specified number of times during one cutting, the above-mentioned fixed distance will be returned. A saw machine cutting control method characterized by stopping cutting work.