JPS5937014A - Method and device for controlling cutting operation of sawing machine - Google Patents

Abstract

PURPOSE:To obtain a satisfactory cutting condition, by detecting the dorsal component of cutting resistance which generates in the dorsal part of a saw blade, and by controlling the descending speed of the saw blade in accordance with a formula formulated from this dorsal component. CONSTITUTION:After a culculating formula for calculating the descending speed of a saw blade housing 2 is previously formulated from a dorsal component by means of a selector switch 21 in consideration with the material, shape, etc. of a work 15, the working is started so that the saw blade housing 2 descends. The descending speed of the saw blade housing 2 is controlled by the amount of working fluid discharged into a tank T3. In order to control the descending speed, a micro-computer 49 computes a descending speed of the saw blade housing 2, which is optimum for the working from the calculating formula previously selected in view of the dorsal component detected by a dorsal component detecting means 11, and an instruction control device 53 controls the drive of a second motor 37 for controlling a valve 39.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cutting control method for a saw machine that allows a good cutting state to be obtained regardless of the material, shape, etc. of the workpiece.
:Related to equipment.

Conventionally, for example, in a horizontal bandsaw machine, a medium-acting cylinder is used as the hydraulic cylinder that raises and lowers the housing that holds the band saw blade. There was.

For this reason, the cutting pressure may be too high due to differences in the grinding power, shape, etc. of the workpiece.To prevent the band saw blade from warping significantly, the material of the workpiece must be covered.

1 (It is necessary to stop or slow down the descending speed of the housing and adjust the cutting pressure)
゛Ah, this adjustment is troublesome.
A bending control valve is installed in the saw blade guide section, and the oil 11 control valve is controlled in proportion to the increase in cutting pressure regardless of the shape, etc. of the workpiece. The lowering speed of the housing is F
A method has been devised to prevent the band saw blade from cutting 1 (1) by keeping the depth of cut of the band saw blade within a certain value. There is something like the published application No. 52-64993.

However, since the detection of the cutting pressure in the invention described above uses hydraulic pressure, there is a risk of oil leakage and a slow response to changes in the cutting pressure. With the development of the microcomputer, complex control is now possible. By stopping or slowing down the descending speed and adjusting the cutting pressure, a good cutting condition can be achieved.
! There is a growing demand for control that allows for

In view of the above, this invention has been developed to provide cutting control for a saw machine that can obtain a cutting state that is 1) regardless of shape, etc. A method a3 and apparatus are provided.

In order to achieve the above object, the present invention provides a cutting resistance force detecting means for detecting the cutting force force generated at the back of the saw blade during cutting by the saw blade. a setting means for setting a change in the descending amount of the saw blade according to a mathematical formula, and a descending speed of the saw blade is determined based on the mathematical formula set from the detected cutting resistance thrust force to determine the descending speed of the saw blade. Control n
The main point is that the system has a configuration in which a calculation control means is installed.

Embodiments of the present invention will be explained below using the reference numeral -C1. Fig. 1 shows an embodiment in which the present invention is applied to a band saw machine, 1 is a band saw machine, 2 is a saw blade housing, 3 is a drive wheel of the band saw ff1l1; 5 is a band saw blade; 7 is a drive wheel of the band saw blade 5, which can be positioned on both sides of the cutting area, respectively.
A guide piece 1-, 111, 1 is provided with a guide piece 9 at its dry end for guiding and supporting the kerbed band saw blade 5. When cutting, the guide piece 9 is provided with a step t on the back of the band saw blade 5. Ushiriru Cutting Resistance Back JJ
The interval between the built-in magnetic generator (Lf in the figure) and the magnetic detection part (f in the figure) changes depending on
Cutting resistance that detects the 11-component force ￥2
(In the above, (back force detection 1st stage 1st name, S-), 13 is the saw blade housing 2 when cutting the liquid added I- object 15.
A hydraulic cylinder 17 rotates downwardly in the 10F direction, and a hydraulic cylinder 17 supplies and discharges operating fluid into the 11-horn chamber 13-a of the hydraulic cylinder 13, and expands and contracts the screw 1-rod 13-b to remove the saw blade. An oil L circuit 19 for rotating the housing 2 calculates the descending speed of the band saw blade 5 based on a formula selected with a selection switch 21 that covers the signal from the back force detection means. It is an arithmetic control means that controls the descending speed of the saw blade housing 2, and its special feature is to calculate one from a plurality of mathematical formulas showing changes in the descending speed of the band saw blade with respect to the spine horn. The purpose is to select the method by taking into consideration the structure, shape, etc. of the object, and to control the speed of the band saw blade by exclusively using the detected cutting speed of the band saw blade.

The hydraulic circuit 17 connects the hydraulic cylinder 1330 [h chamber 1
3-a and the first t-evening 23. Variable volume suspended oil 1■ Pump 25 (J: l) 4 to 1 to 3 to oil path 28 connecting the pressure source 27 consisting of pump J and oil pump 25 (J: l) and tank T1. Position solenoid switching valve 29 (hereinafter referred to as “first
A branch path 31 branching from the oil path 28 is connected to the tank 12 via a sequence valve 33.-h, oil/f circuit'
l, 7 iJ, the pressure chamber 133 a, etc., the throttle valve 35
．． Proportional electromagnetic flow control valve 39 (hereinafter referred to as 1 control valve 1 in A) A3J, whose C flow is controlled by the second valve 37;
A second switching valve 45 is provided in an oil passage 43 that connects the 11 sigma tanks 1-3 to a drop source 41. , a3, the tank 14 is operated like the tank chamber 13-a.
1 extraction system yU means 1, which is a tank of fluid 1-1 oil waste
9 is a Δ/D conversion path /I7 that indicates the thrust force outputted from the thrust force detection means 11 and converts the analog signal 1-1 into a digital signal, and a Yogi liquid addition 1
- Several mathematical formulas showing the change in thrust force with respect to the cutting speed of the bandsaw blade with differences in the material, shape, etc. as parameters are shown in Figure 2 ([)] Based on the mathematical program selected by the selection switch 21 as shown in Figure 7, the cutting speed is calculated from the signal without indicating the thrust force input from the conversion path 47 (, Δ7/1) = l A digital signal indicating the cutting speed supplied from the input coater 49 and the microphone 21) is displayed.
'Convert to Nolog Shinzuki 1] / Δ conversion path 51, Abu [
] Based on the signal, the second
A command control unit 5 outputs a control signal to control the rotation of the motor 37 and adjust the descending speed of the saw blade housing 2.
3.

Next, the operation of this embodiment will be explained.

The selection switch 2 is selected in consideration of the material, shape, etc. of the workpiece 15.
In step 1, a calculation formula for calculating the descending speed of the saw blade housing 2 from the backward force is set in advance, and then #II I is started.

If the saw blade housing 2 is to be raised to the b position of the hydraulic circuit 17 as described above, the first switching valve 29 is switched to the upper R side 29-a and the operating pressure fluid is supplied from the C pressure supply source 27. 11 in the pressure chamber 13-a of the cylinder 13, or to avoid descending, the first switching valve 29 is switched to the descending side 2.
9-b, and transfer the working pressure fluid in the C pressure chamber 1ζ3-a to the weight of the saw blade housing 2 by a predetermined amount in the tank.
``At 4, the second switching valve 45
C1 is discharged into the tank 1-3 while controlling the flow rate with the throttle valve 35J3 and three control valves.

When the liquid additive 1 (unoh1-do-V) is started, the saw blade housing 2 descends, but the descending speed at , C will be controlled, and this control will be performed by the thrust force detection means 1.
1'c From the detected thrust force, the optimum descending speed of the saw blade housing 2 for J9 is determined by the preset equation 51, and the calculation result is calculated. Based on this, the command control unit 53 controls the flow rate of the control valve 39 and controls the drive of the second motor 37.

4T. In this embodiment, the means for detecting the thrust force is electrically connected to the guide piece 9, but the method is not limited to this method. For example, as shown in FIG. Detection level Pressure detector 1) 5 is installed -U:IJ,L.

In addition, in FIG. 3, J3 having the same reference numeral as in FIG. 1 indicates the same thing.

In addition, regarding the descending speed control of the saw blade housing 2 shown in Figures 1 and 3, the hydraulic cylinder 1 is used.
3, there are 6 lines (although this method is not limited to this method, for example, as shown in Figure S5/1, the rotation of the lead scrico 5) 7 which is pivotally supported on the rotation axis of the pulse (needle 1) 6, The lead screw F) 7 j-k, the foot 1 to the foot 59 that are provided move up and down.
The saw blade housing 2- also has the same part 59 as -1-
By adopting a configuration in which it moves downward, the driving of the pulse 56 can be controlled by the pulse. 41. In Figure 4, the same numbers as in Figures 1 and 33 refer to the same items.

Therefore, according to the present invention, the cutting resistance back force generated on the back of the saw blade during cutting is detected, and from the back force, a preset value is determined in consideration of the abrasiveness, shape, etc. of the workpiece. The cutting speed is calculated based on a mathematical formula that shows the change in the cutting speed of the saw blade with respect to the thrust force of the cutting resistance, and the cutting speed of the band saw blade is controlled based on the calculated result. As a result, the cutting pressure may be too low due to differences in the grinding speed, shape, etc. of the workpiece (in addition to preventing the bandsaw blade from cutting,
A suitable addition to the shape, etc.? -j'c>C, and thus a good cutting condition can be obtained. In addition, the cutting resistance force is detected as an electric signal, and control is performed based on the electrical signal. Good response speed.

[Brief explanation of the drawing]

Fig. 1 shows an example of the present invention, Fig. 2 (a) shows an example of changes in the speed of a band saw blade that is applied to the back force, Fig. 2 (b)
) L, L selection switch example, Figure 3 is an example of changing the method of detection of cutting resistance thrust force, Figure 4 is an example of changing the upward movement method to - of the saw blade housing. (Main 41 parts of the drawing shown and explanation of symbols) 5...Band saw blade °11...Backward force detection means 21...
Selection switch J 717...Δ/1) converter/I9・
...Mike f"-"mpi", -ta51...D/△change49! 5:3...Command control device 55...Pressure detector Fig. 2 (a) "nlT/m1n", Fig. 2 (b)

Claims (2)

[Claims] (1) Detect the cutting resistance force generated on the back of the saw blade when cutting with the saw blade, and calculate the amount of force of the saw blade against the preset cutting resistance force based on the cutting resistance force. A cutting control method for a saw machine, characterized in that the descending speed of the saw blade is controlled by controlling the descending speed of the saw blade based on a mathematical formula indicating a change in suspension. (2) R1 on the back of the saw blade when cutting
A cutting resistance force detection means for detecting cutting resistance force, and a 1-stage setting that sets the change of 1:1 per hour of the saw blade in response to the cutting resistance force using a mathematical formula. The cutting force of the saw blade is characterized by comprising a performance control means for calculating the descending speed of the saw blade and controlling the descending speed of the saw blade based on a mathematical formula set from the cutting resistance angle. control 211
Device.