JPS5820729B2 - Saw machine cutting control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting control method in a saw machine, and more specifically, to controlling the descending speed of a band saw blade from the descending start position to just before cutting into a workpiece M, and during cutting. controls the cutting position or cutting speed of the bandsaw blade to keep the cutting rate constant,
Furthermore, the present invention relates to a method of controlling the depth of cut in a saw machine, which performs control to raise the band saw blade at a predetermined speed to a predetermined position on a rigid material by sequence control after cutting is completed.

The purpose of this invention is to
During cutting, the band saw blade's cutting position or cutting speed is controlled to keep the cutting rate constant, and after cutting, the band saw blade is lowered onto the rigid material. The present invention provides a cutting control method for a saw machine, which performs control to raise the saw blade to a predetermined position at a predetermined speed by sequence control, and significantly improves cutting efficiency.

Another object of the present invention is to provide a cutting control method for a saw machine that can improve work safety and perform cutting work with high precision because all series of controls are performed by sequence control. It is.

Furthermore, another object of the present invention is to provide cutting control in a saw machine that allows cutting to be performed at a constant cutting rate by sequentially controlling the cutting position or cutting speed of a saw blade relative to a rigid material. The present invention provides a method.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 shows a general horizontal bandsaw machine, in which a rectangular base 1 has a workpiece support stand 3 for supporting a workpiece M, and a workpiece M is placed and supported on the workpiece support stand 3. A vice mechanism 5 comprising a fixed vice jaw 5f and a movable vice jaw 5m for clamping and fixing the workpiece M is attached.

Further, on the base 1, a C-shaped saw blade housing 7 is supported via a hinge pin 9 so as to be freely rotatable in the vertical direction.

A drive wheel 13 is rotatably housed inside one housing part 11 of the saw blade housing 7 via a drive shaft 15, and the other housing part 17 has a drive wheel 13 rotatably mounted therein.
A driven wheel 21 is rotatably installed inside via a rotating shaft 19.

A loop-shaped band saw blade 23 is wound around the drive wheel 13 and the driven wheel 21.

Note that in the saw blade housing 1, the housing portion 11.
The guide member 2γ provided on the beam member 25 that connects and supports the vicinity of the upper part of the band saw blade 23 has guide pieces 29 and 31 at its lower end for guiding and supporting the band saw blade 23 on both sides of the cutting area of the band saw blade 23. The provided arm members 33, 35 are each mounted to be adjustable in position.

In the horizontal bandsaw machine having the above configuration, a rotary drive device such as a motor (not shown) is interlocked with the drive shaft 15.
The drive wheel 13 is driven to rotate, and the band saw blade 23, which is wound around the drive wheel 13 and the driven wheel 21, is driven to travel and cut the workpiece M.

Note that in order to vertically rotate the saw blade housing 7 about the hinge pin 9 when cutting the workpiece M, the tip of the piston rod 37 is pivotally connected to an appropriate position of the saw blade housing 7. This is due to the operation of a lift cylinder 39 whose base is pivotally supported by the base 1.

That is, the saw blade housing 7 is rotated upward by supplying pressure oil into the lift cylinder 39 and causing the piston rod 37 to protrude.

Thereafter, the saw blade housing 7 is rotated downward by switching the oil passage and discharging the pressure oil in the shift cylinder 39 due to the weight of the saw blade housing.

Next, an outline of the cutting position control method according to the present invention for a horizontal bandsaw machine will be explained based on FIGS. 2, 3, and 4.

In FIG. 2, it is assumed that the band saw blade 23 descends to cut the workpiece M while remaining horizontal.

Then, the cutting length of the workpiece M at a certain time t is determined as L=L(y) as a function of the position y of the band saw blade 23 once the shape and two dimensions of the workpiece M are determined.

By the way, what is the cutting rate on a saw machine? Cutting area Cutting length x depth of cut Cutting rate 2□2□ time time = Cutting length x cutting speed is defined as

Therefore, the cutting rate η is calculated by: Cutting rate η2 Cutting length x Depth of cut VtHere, for ease of understanding, consider the case where the cutting rate η is controlled to be constant, and assume that the cutting rate η is constant. , If we integrate both sides of this equation (2), we get f L(y)dy ”ηt+C(C2 integral constant ・
...(4) When 1=0, y=Q, and in this case, the cutting surface, that is, at a certain time t, the saw blade position is changed so that the saw blade position y or the above equation (6) is satisfied. If , the cutting rate η becomes constant.

Further, FIG. 3 shows the relationship between the saw blade position y and the cutting length, and FIG. 4 is an explanatory diagram showing the function of equation (6).

Next, at a certain time t, the apparatus of the present invention for controlling the saw blade position y, satisfying the above equation (6) and keeping the cutting rate η constant, is applied to the workpiece M using the saw blade housing. A column type saw machine in which the saw blade 7 moves up and down in the vertical direction and a hinge pin type saw machine in which the saw blade rotates in the vertical direction using the hinge pin 9 as a fulcrum will be explained.

First, FIG. 5 shows a first embodiment of this invention.
This is a positioning device that uses a column-type saw to perform positioning in the Y direction, that is, in the cutting direction with respect to the workpiece M.

In this positioning device, a positioning rod 41 is suspended from the lower surface of the saw blade housing T, and a positioning control device 43 for controlling the vertical position of the saw blade housing 7 is provided at the lower end of the positioning rod 41.

An arm member 4 is provided at the upper center of the positioning rod 41.
A digital position detecting scale 47 (position detecting device 47) is integrally attached to the position detecting device 47 via the arithmetic processing device 49. A detection head 47a for output is attached.

The arithmetic processing unit 49 stores the cutting length L(
The saw blade position y to give the desired cutting rate η
(cutting position) and its cutting time di, the above-mentioned formula (3) % Formula % Then, the saw blade position y determined by this arithmetic processing device 49
A position command value y1 of (cutting position) is output to the positioning control device 43, and the positioning control device 43 controls the vertical position of the saw blade housing 7 so that a desired cutting rate η is achieved. It is.

That is, the position of the saw blade housing 7 in the Y direction, that is, the band saw blade 23
The depth of cut is controlled by a positioning control device 43 in the Y direction, and this positioning control device 43 controls the position command value y1.
The positioning is performed by this method.

By the way, the method of giving the position command value y1 is as follows.

(a) At time t, the saw blade position is y, and the cutting length at this time is L.

(b) Assuming that the band saw blade 23 makes a cty cut by a future time (t+at1) after time dt1, the cutting length is assumed to be constant within the minute time dt.

) From the above formula (3), d t1 =: L(y) d y
...(The force becomes η.

(c) As a result, after time dt1, position command value (y
t+dy) to the positioning control device 43 in the Y direction, the saw blade housing 1 moves by the depth of cut ciy, and therefore the cutting area L(y)dy is cut in the time dt1. (7) Formula (a tl--L(y)d
y), cutting is performed at the desired cutting rate ηη.

Next, FIG. 6 is a graph explanatory diagram showing the relationship between saw blade position y and cutting time t in the apparatus of the first embodiment.

In this graph explanatory diagram, the bandsaw blade 23 is ygy+d
ytsuy+2dy! The stationary cutting time dt1, dt2, dt3, etc. at y+3dy cutting angle, etc. is long, so it seems that cutting is performed at a high cutting rate during the short time when moving between them, but the depth of cut cty If the value of is made sufficiently small, the cutting rate η will actually be averaged out due to the deflection of the saw blade, etc.

(d) Although the above is an example in which the depth of cut cty is constant and the time di is varied, one or both of the formula (3) may be varied.

In addition, as the above-mentioned Y direction positioning control device 43,
For example, hydraulic lift cylinders or metering valves are used.

Next, FIG. 7 shows a second embodiment of the present invention in a column-type saw machine.
7, the saw blade position y of the saw blade housing 7 is detected.

Then, the saw blade position y outputted through the current position register 51 and data on the shape and dimensions of the workpiece M are respectively provided to the arithmetic processing unit 49 to determine the cutting length L (y).

Next, a combination of values of cty and ctt is created based on the formula (7) (−L(y)ay for at), and the Y position command value y1 is set in the command position register at each di time. Give to 53.

The output P1 from the command position register 53 is given to a positioning control device 43 enclosed by a dashed line in FIG. 7, and this positioning control device 43 controls the cutting position of the saw blade housing 7.

The positioning control device 43 is a combination of known devices using a servo valve 55, and is configured as follows.

A comparison device 59 that compares the output P1 from the command position register 53 and the y-position corresponding output voltage P2 from the linear potentiometer 57 provided integrally with the position detection device 47, and a command from the comparison device 59. On the basis of the,
a servo valve control device 61 that controls the servo valve 55;
It is comprised of a lift cylinder 63 that raises and lowers the saw blade housing T based on pressure oil supplied and discharged from the servo valve 55 and performs positioning.

Therefore, based on the position command from the comparison device 59, the servo valve control device 61 is controlled, and the position of the saw blade housing 7 in the Y direction is adjusted to the desired cutting rate η via the servo valve 55 and the lift cylinder 63. It is controlled so that the

In this second embodiment, the same components as those in the fourth embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

Next, FIG. 8 shows a third embodiment of the present invention in a column-type saw machine, and in this embodiment, as in the second embodiment, the position detection device 47 detects the position of the saw blade in the saw blade housing 7. Detect the blade position y.

Then, the saw blade position y outputted through the current position register 51 and data on the shape and dimensions of the workpiece M are respectively provided to the arithmetic processing unit 49 to determine the cutting length L (y).

■ Next, create a combination of values of dy and dt based on the formula (7) (d t1 = -L(y)dy), and for each di time,
The Y position command value y1 is given to the command position register 53.

The process up to this point is the same as the second embodiment, and next, the value P1. which is output from the current position register 51 and the command position register 53. P2 is applied to the comparator 59.

If the value compared by the comparator 59 is greater than the value in the command position register 53.

A rotation command is given to the motor command control device 65, and the motor M1
is driven to discharge the hydraulic oil in the lift cylinder 63 by the metering valve 67, and the saw blade housing 7 is lowered.

Note that the metering valve 67 here refers to the motor M1.
This is a valve that changes the discharge amount and discharge amount of hydraulic oil according to the rotation speed of the hydraulic oil.

As the saw blade housing T descends, the value of the current position register 51 increases, and when it reaches the value of the command position register 53, the comparison device 59 gives a stop command to the motor command control device 65, and the motor M1 and metering Valve 67 is stopped.

As a result, the oil drained from the lift cylinder 63 is almost completely exhausted, the lowering of the saw blade housing T is stopped, and the saw blade housing 7 is positioned at the position indicated by the Y position command.

In this third embodiment as well, the same components as those in the first and second embodiments will be described with the same reference numerals.

Next, how to determine the cutting length L(V) for various shapes of workpieces M in the column-type saw machine as described above will be explained.

First, when calculating the cutting length L(y) of an equilateral triangular workpiece M as shown in Fig. 9, if the length of one side of the workpiece M is U, then the cutting length at the height y. L (y) is determined by the following equation.

When this equation (a) is substituted into the above equation (6), the following is obtained.

Next, in the case of the workpiece M, or a pipe as shown in Fig. 10,
In Fig. 10, the cutting length L(y) is determined by the following equation: O< y <, r1r2? r1+r2≦y
The cutting length Ly in the range of ≦2r1 is as follows.

Next, FIG. 11 shows a fourth embodiment in which the present invention is implemented in a hinge-type saw machine that rotates vertically about a hinge pin 9. The difference from the column-type saw machine described above is that an encoder 69 for detecting the angle of the saw blade housing 7 is provided in place of the scale 47 for detecting the position.

That is, the configuration of this embodiment includes a drive shaft 71 connected to the hinge pin 9 of the saw blade housing 1, a gear 73, and a reducer 75.
, and drive motors γγ are provided, and the gear 73 is meshed with a gear 79 that interlocks with an angle detection encoder 69.

In the case of this embodiment, the angular position θ of the saw blade housing 7 is first detected by the angle detection encoder 69.

After inputting this angular position θ into the current position register 81, the angular position θ of the saw blade housing 7, data on the shape and desired cutting rate η of the workpiece M, and data on the shape and desired cutting rate η of the workpiece M are input. The height H of the workpiece determined by the height detection scale 83 and the width l of the workpiece M determined by the material width detection scale 85 are provided to the arithmetic processing device 49, respectively;
Find the cutting length Lθ.

By the way, a general formula for determining the cutting length Lθ of a hinge-type saw machine can be expressed as follows.

Note that the cutting length is expressed as L(θ) as a function of the inclination θ, and the two dimensions of the workpiece M and the shape of the saw machine are shown in FIG.

In FIG. 12, a straight line Z (corresponding to saw blade light) is a straight line passing through a point P (J H sin θ, H (1-oos θ)) and having an inclination of −tan θ.

If we set y knee tanθ・x+C, it passes through point P, so H(
1-oosθ) = tanθ(J-Hs in +C +”e C=H(1-oosθ)+tanθ(J-H
The equation of the straight line Z determined by sin is
(J −Hsinθ) −(f) Also, the equation for the outer diameter of the workpiece M is (x+r)2+(y r)2=r2 ・”(g
) The cutting length Lθ is the distance between two intersections between the inside of the workpiece and the saw blade straight line y.

Next, find the intersection between the inside of the workpiece and the straight line of the saw blade.

In the above formula (f), H(1-oosθ) tanθ(J-
If Hsin is set as ψ, then y tan θ°x + cp
= (11) Substituting this equation (h) into the above equation (g), (X0r) 2+ (-tanθx+ψ-r)2”
r2(1+tan2θ) X2+2 (tanθ(r
-9))+rlx+(r9))2=0
”(i) In the range where the saw blade straight line y intersects within the work material,
The above formula (i) has a real root.

The root of y=ax2+2b'x+CO is b/± b”-aC X2□ If X 1 > X 2 , then becomes.

Next, using the general formula for determining the cutting length L (θ) of the hinge type saw machine, for example, the depth of cut cty and cutting rate of the workpiece M with a round cross section and the workpiece M with a rectangular cross section are calculated. How to obtain η will be explained.

, Fig. 13 shows the cutting length L (
θ) is shown, and the depth of cut dy of this workpiece M is determined by the depth of cut dy on the side closer to the hinge pin 9 and the side farther from the hinge pin 9 within the range of θ). For example, if we adopt the value of the midpoint of the cutting length L (θ), the X coordinate of the midpoint is the distance between the midpoint and point P, and the depth of cut dy is the displacement in the direction perpendicular to the sawtooth. Therefore, the depth of cut (η) is as follows.

Note that the combination of cty and at (or dθ and old) corresponds to the value of (y) or (θ) and can be calculated, so the calculation should be performed before cutting, not during cutting. , (y) or (θ) to obtain a combination of dy and dt or dθ and dt.

And during cutting, di corresponding to the value of (y) or (θ)
It is also possible to extract and use a combination of and dt, or dθ and dt.

Furthermore, the above explanation has been detailed on the assumption that the cutting rate η is controlled to be constant, but in actual cutting, if the cutting rate η is constant, the cutting length and θ) are short. Under such conditions, the cutting rate may not be completely constant, and the cutting rate may be reduced where the cutting length is short. It is possible to arbitrarily set the relationship between the length L(θ) and the cutting rate η.

FIG. 14 shows an explanatory diagram for determining the cutting length L (θ) of a workpiece M with a rectangular cross section, and the straight line Z (corresponding to a sawtooth) is
It is a straight line with an inclination -tanθ passing through the point P (J −Hsinθp H(1-oos).

If we set y-" tanθ・x + c, it passes through point P, so H(1-oosθ) = -tanθ(J-Hsin
θ) 10C,', C2H(1-oosθ) + tan
The equation of the straight line Z obtained from θ (J − H sin θ) is y” tan θ・x+H (+tan of 1−oos・
(Equation (1) of work material M of J-Hs in) Cutting length QQ' (1
i) The cutting length qq' can be determined when the sawtooth is below the R point.

The above is an example of how to calculate the cutting length θ using a hinge type saw. ,dθ,d
A combination of values of t is created and a y position command is given to the command angle position register 87 every dt time.

Then, the output signal from the command angular position register 87 is input to a comparison device 89, and after being compared with the angular position θ from the current position register 81, this comparison data is output to the motor control device 91.

The motor control device 91 controls the drive motor 77 to control the angular position θ of the saw blade housing T, thereby controlling the cutting rate to a desired cutting rate η.

In FIG. 11, the saw blade frame angle positioning device 93 surrounded by a dashed line is an appropriate device.

As described above, in the above embodiment, the depth of cut position is adjusted so that the cutting rate η becomes a desired value based on the relationship between a certain time t and the cutting length L(y) (or L(θ)) at that time. In this method of controlling the position of the saw blade housing, next, at a certain time t
The cutting speed Vt is adjusted so that the cutting rate η becomes a desired value based on the relationship between the cutting length L(y) and the cutting depth cty at that time.
An example of a speed control method for controlling the speed will be described.

Note that this speed control method also has a configuration in which the cutting length L(y) is determined by a column-type saw, and a configuration in which the cutting length L (y) is determined by a hinge-type saw.
Since the configuration required for (θ) is slightly different, in the following explanation, the column type and hinge type will be explained separately.

Further, in the following embodiments, the same components as those in the embodiment of the position control method described above are given the same reference numerals, and the explanation thereof will be omitted.

Furthermore, the general formula for determining the cutting rate η at a certain time t is:
This is exactly the same as equation (6) explained in the above position control method.

First, FIG. 15 shows a fifth embodiment of the present invention using a speed control method in a column-type saw machine. In this embodiment, the cutting speed V of the saw blade housing 7 in the y direction
t is controlled by a speed control device 95.

In this embodiment, the method of giving the speed command is as follows:
Do it as follows.

(a) Let the saw blade position be y at a certain time t, and let the cutting length at this time be L(y).

(b) And the time after di time (t-1-a t
), the position (y+dt) of the saw blade housing 7 is detected by the position detection device 47 and the detection head 47a.

(c) Then, within the minute time dt1, the cutting length L
If (y) is assumed to be constant, then

y (d) In the above formula (2) (L(y), I I-η),
If the desired cutting rate η is given, the desired cutting speed ■t' can be determined.

(e) Then, the arithmetic processing unit 49 compares the actual cutting speed Vt and the desired cutting speed Vt', and issues a speed command to the speed control device 95 so that the two speeds approach or match. give.

The speed control device 95 controls the cutting speed of the saw blade housing 7 to a desired cutting rate η.

FIG. 16 shows a sixth embodiment of the present invention in which a speed control method is used in a column-type saw machine. Detect the cutting position y and the cutting position y
The amount of change cty is detected.

Then, the arithmetic processing unit 49 determines the actual cutting speed ty Find Vt=-.

dt The cutting length L(y) is calculated and determined based on the two dimensions of the shape of the workpiece M and the cutting position y detected by the position detecting device 47.

Then, the desired cutting rate η is inputted into the calculation device 49, and along with the cutting length L(y) obtained above, the above-mentioned (2)
The desired cutting speed Vt' is determined by the formula.

Next, this desired cutting speed Vt' and the actual cutting speed Vt are compared by a comparison device 59, and when the actual cutting speed Vt is large, the speed command is decreased, and when both speeds are equal, the speed command is decreased. ,
Keep the speed command as it is, and further increase the actual cutting speed Vt.
When is small, the speed command is output to the servo valve control device 61 to increase the speed command.

Note that the actual cutting speed Vt is determined by the rack 97 provided integrally with the arm member 45 that supports the position detection device 47.
, a pinion 99 and a speed generator 101 that mesh with this
It is detected by

Then, the speed generator 101 outputs a signal of the actual cutting speed Vt to the comparison device 59.

The speed command controlled by the servo valve control device 61 controls the servo valve 55 to control the cutting speed of the saw blade housing 7 via the lift cylinder 63.

In addition, in Fig. 16, the part surrounded by the dashed line is
A speed control device 95 is shown, but the present invention is not limited to this embodiment, and a known device may be used.

Further, the above-mentioned control order is not limited to supply, and it is possible to change the control order within a range where necessary control is performed.

Furthermore, in the above embodiment, the cutting position y was sampled at a fixed time interval di, but the cutting position may also be sampled at a fixed cutting position interval dt and input to the arithmetic processing unit 49. Alternatively, sampling may be performed at intervals where both dy and dt change.

FIG. 17 shows a seventh embodiment of the present invention using a speed control method in a column-type saw machine, and this embodiment is almost the same as the sixth embodiment described in FIG. The difference is that the device that controls the cutting speed of the saw blade housing 7 is a motor command control device 65 that inputs the speed control command output from the comparison device 59, and a control signal from this motor command control device 65. It is comprised of a drive motor 77 that is rotationally driven, and a flow control valve 103 that controls the discharge flow rate of hydraulic oil in the lift cylinder 63 by driving the drive motor 77.

Therefore, in the speed control method, the actual cutting speed Vt detected by the speed generator 101 and the desired cutting speed Vt' are compared by the comparing device 59, and the actual cutting speed Vt' is compared with the desired cutting speed Vt'. When the input speed Vt is large, the speed command is made small, when it is equal, it is left as is, and when it is even smaller, the speed command is controlled to a larger value.

Based on these speed commands, the drive motor γ7 is controlled via the motor color control device 65, and the flow rate control valve 1 is controlled.
The amount of oil discharged from the lift cylinder 63 is controlled by adjusting the opening degree of the lift cylinder 63, and the cutting speed Vt is made to follow the speed command.

FIG. 18 shows an eighth embodiment of the present invention using a speed control method in a column-type saw machine, and this embodiment has almost the same configuration as the third embodiment described in FIG. The difference is that the motor command control device 65 has
The speed command obtained by the arithmetic processing unit 49 is input, and the motor command control unit 65 controls the rotational speed of the motor M1 to control the amount of oil discharged from the metering valve 67.

Further, since the flow rate per unit time is proportional to the rotational speed of the motor M1, the metering valve 67 is connected to the motor M1.
If the rotational speed of the saw blade housing 7 is made to correspond to the command speed, the moving speed of the saw blade housing 7 in the y direction, that is, the cutting speed Vt, corresponds to the speed command.

FIG. 19 shows a ninth embodiment of the present invention using a speed control method in a hinge type saw machine.
Similar to the fourth embodiment shown in the figure, gears 73a, 73 are connected to the drive shaft 71 connected to the hinge pin 9 of the saw blade housing 7.
b, a reduction gear 75, and a drive motor 77 are provided, and the gear 73a is provided with a gear? An encoder 69a for detecting the angle of the saw blade housing 7 is provided through the gear 9a, and a speed generator 69b for detecting the cutting angle θ of the saw blade housing and the angular velocity of the drive motor 77 is provided on the gear 73b.

Then, the angle detection encoder 69a samples the saw blade housing cutting angle θ at fixed time intervals dt, and outputs the sample to the arithmetic processing unit 49 via the current position register 81.

Then, the saw blade housing cutting angle θ detected by the angle detection encoder 69a and the height detection scale 8
3 and the two dimensions of the shape of the workpiece M determined using the scale 85 for detecting the vise width, etc., the arithmetic processing unit 49 determines the cutting length L (θ).

Furthermore, the desired cutting rate η is input to the arithmetic processing unit 49, and the desired cutting angular velocity ■t' is determined based on the calculated cutting length Lθ.

Then, the desired cutting angular velocity Vt' obtained by the arithmetic processing unit 49 and the actual cutting angular velocity Vt detected by the speed generator 69b are compared by the comparator 89, and this compared value is used as the motor command. Output to control device 105.

When the actual cutting angular velocity Vt is larger than the desired cutting angular velocity t', the angular velocity command is made smaller; when it is equal, the angular velocity command is left unchanged; and when the actual cutting angular velocity Vt is smaller, the angular velocity command is Make it bigger.

In this way, the motor command control device 105 controls the angular velocity of the drive motor 77 in accordance with the given angular velocity command.

The above are examples of the cutting speed control method, and in this control method, the cutting length L (y
) or L(θ) is exactly the same as the above-mentioned cutting position control method, so a detailed explanation will be omitted.

Next, FIG. 20 shows a tenth embodiment of the present invention, and this embodiment combines the position control method (first to fourth embodiments) and the cutting speed control method (fifth embodiment). This is a quick approach device for a saw machine that can be implemented in common with the embodiments to the ninth embodiment.

So, the quick approach device of the saw machine is the band saw blade 23.
However, the band saw blade 23 performs rapid feed until just before cutting into the workpiece M, and when the band saw blade 23 approaches a predetermined positional relationship with the workpiece M, the device switches from the rapid feed to feed for cutting.

For example, when this embodiment is implemented in the above-mentioned column-type saw machine, a position detection scale 47 is attached to a positioning rod 41 vertically installed on the lower surface of the saw blade housing 7.
and a lift cylinder 63, and the lift cylinder 63 is provided with a flow rate adjustment valve 109 whose amount of oil discharge is controlled by a sequence control circuit 107 of the saw machine, which will be described later.

On the other hand, the shape and dimensions of the workpiece M are detected in advance using a scale 83 for detecting the height of the material and a scale 85 for detecting the width of the material.

Then, the saw blade position is determined to give a desired cutting rate η to the distance between the workpiece M detected by the position detection scale 47 and the band saw blade 23 and the cutting length L(y) at a certain time t. y (cutting position) and further the shape 9 dimensions of the workpiece M are given to the arithmetic processing device 49.

However, in the case of this embodiment, since cutting is performed by quick approach as described above, the band saw blade 23 is
The dimensions of the workpiece M are given in advance to the arithmetic processing unit 49 as a value larger than the actual outer diameter of the workpiece M, and the calculation is performed so as to temporarily stop immediately before the cutting process.

The value calculated by the arithmetic processing device 49 is output to the sequence control circuit 107, and the amount of oil discharged from the lift cylinder 63 is controlled based on the control signal output from the sequence control circuit 107. .

That is, the positional relationship between the workpiece M and the band saw blade 23 calculated by the arithmetic processing unit 49 is output to the sequence control circuit 107, and according to a command from the sequence control circuit 107,
The lowering speed of the band saw blade 23 is increased from the lowering start position to the position just before cutting into the workpiece M, and the band saw blade 23 cuts into the workpiece M.
After approaching a predetermined position, the workpiece M is cut while controlling the cutting position of the saw blade to keep the cutting rate η constant. The band saw blade 23 is raised at a desired speed to the detached position, and the band saw blade 23 is
Sequence control is performed so that the band saw blade 23 is stopped when it rises to a predetermined position on the workpiece M.

Therefore, since the cutting process is controlled by sequence control, cutting efficiency can be improved.

In addition, in the said cutting process, although the whole process is performed by sequence control, only a part of process may be performed by sequence control.

Furthermore, in this example, the shape of the workpiece M.

The dimensions are detected by a height detection scale 83 and a scale 85 for detecting the width of the workpiece M, and are output to the arithmetic processing unit 49. However, the numerical value may be input to the arithmetic processing unit 49.

Also, by using the quick approach method of this example,
For example, when cutting a circular workpiece M, the equation of the material circle is (x + r) 2 + (y r) 2 = (r + a) 2 as explained for the hinge type saw in Fig. 12. Equation of the straight line Z of the saw blade % Formula % () Increase the cutting speed by quick approach, which is the time until it touches the heavy plate, and substitute the above equation (f) into the equation of the material circle. The end point of the quick approach is when the discriminant of the root of the quadratic equation obtained by b2-4ac=0.

Moreover, when the shape of the workpiece M is a rectangular cross section.

When the height of the workpiece M is H, the value of the straight line Z is x=Q
When y='h+β, the quick approach ends.

Although the above embodiments have been described with respect to the quick approach method for a hinge type saw machine, it goes without saying that the quick approach method can also be implemented for a column type saw machine.

Note that this invention is not limited to the various embodiments described above,
It is also possible to implement other embodiments.

As described above, this invention controls the descending speed of the band saw blade from its starting position to just before cutting into the workpiece M, and during cutting, the cutting position of the band saw blade in order to keep the cutting rate constant; Alternatively, control of the cutting speed and, after cutting is completed, control of raising the band saw blade to a predetermined position on the workpiece at a predetermined speed are performed by the arithmetic processing unit and the sequence control device. It has the following excellent effects.

(2) A series of steps from the start of the lowering of the band saw blade 23 to the end of cutting the workpiece M and the start of the next cutting are all performed by sequence control, so that work efficiency can be significantly improved.

(2) Also, for the same reasons as mentioned above, work safety can be significantly improved and cutting can be performed with high precision.

(2) Furthermore, by computationally controlling the cutting position or cutting speed of the saw blade relative to the workpiece material, there is an effect that cutting can always be performed at a constant cutting rate.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of a general horizontal bandsaw machine, Figures 2 to 4
The figure is an explanatory diagram showing a general method for determining the cutting rate in a band saw machine. Figures 5 to 14 show an embodiment using the position control method of the present invention. Explanatory diagram showing the first embodiment when implemented on a board, No. 6
The figure is a graph explanatory diagram showing the relationship between the cut position of the bandsaw blade and time in the first embodiment, and FIGS. 7 and 8 show the second and third embodiments of a column-type saw machine. 9 is an explanatory diagram for determining the cutting length of an equilateral triangular workpiece M on a saw machine with column-shaped waves, and FIG. 10 is an explanatory diagram for determining the cutting length of a tubular cross-section workpiece M. An explanatory diagram, Fig. 11 is an explanatory diagram showing a fourth embodiment of the present invention in a hinge type saw machine, and Fig. 12 is an explanatory diagram of an equation for calculating a general cutting rate in a hinge type saw machine. , Fig. 13 is an explanatory diagram for determining the cutting length of a workpiece with a circular cross section using a hinge type saw machine, and Fig. 14 is an explanatory diagram of calculating the cutting length of a workpiece with a rectangular cross section using a hinge type saw machine. 15 to 19 are explanatory diagrams showing an embodiment using the speed control method of the present invention, and FIG. 15 is an explanatory diagram showing a fifth embodiment of the present invention in a column-type saw machine. Fig. 16 is an explanatory diagram showing a sixth embodiment of the present invention in a column type saw machine, Fig. 17 is an explanatory diagram showing a seventh embodiment of the invention, and Fig. 18 is an explanatory diagram showing an eighth embodiment of the invention. FIG. 19 is an explanatory diagram showing a ninth embodiment of the present invention in a hinge type saw machine, and FIG. 20 is an explanatory diagram showing a tenth embodiment of the cutting control method by sequence control of a saw machine in the present invention. It is an explanatory diagram. Explanation of main symbols shown in the drawings, M...
Work material, 23... band saw blade, η... cutting rate, 49... arithmetic processing unit, 107...
・Sequence control circuit.

Claims (1)

[Claims] 1. The position of the saw blade with respect to the workpiece M and the two dimensions of the shape of the workpiece N are input to the arithmetic processing device 49, and the arithmetic processing device 4
The positional relationship between the workpiece M and the band saw blade 23 calculated in step 9 is output to the sequence control circuit 107, and the band saw blade 23 is moved from its lowering start position to the workpiece N by a command from the sequence control circuit 107. Sequence control is performed so that the band saw blade 23 is rapidly forwarded to the position immediately before cutting, then the workpiece M is cut at a desired cutting rate η, and after the cutting process is completed, the band saw blade 23 is raised and returned to a predetermined position where it separates from the workpiece M. A method of controlling the cutting depth of a saw machine. 2. The cutting control method for a saw machine according to claim 1, wherein the band saw blade 23 is rapidly moved from a lowering start position to a position immediately before cutting into the workpiece M by sequence control. 3. The cutting control method for a saw machine according to claim 1, wherein after the cutting process by the band saw blade 23 is completed, the band saw blade 23 is raised and returned to a predetermined position where it separates from the workpiece M by sequence control. 4. Input the position of the saw blade with respect to the workpiece M and the two dimensions of the shape of the workpiece M to the arithmetic processing device 49;
The positional relationship between the workpiece M and the band saw blade 23 calculated in step 9 is output to the sequence control circuit 107, and the band saw blade 23 is moved from its lowering start position to the workpiece M according to a command from the sequence control circuit 107. After the bandsaw blade 23 approaches the predetermined position of the workpiece M by fast forwarding to the position just before cutting, the workpiece M is cut while controlling the cutting position of the saw blade to keep the cutting rate η constant. After completing the cutting process of the material M to be sawed, the band saw blade 23 is raised at a desired speed to a position where it is detached from the workpiece M, and the band saw blade 23 is raised to a predetermined position on the material M to be sawed. A cutting control method for a saw machine that performs sequence control so as to stop the band saw blade 23 when cutting. 5. The cutting control method for a saw machine according to claim 4, wherein rapid forwarding of the band saw blade 23 from a lowering start position to a position immediately before cutting into the workpiece M is performed by sequence control. 6 After cutting the workpiece M, remove the band saw blade 2 from the workpiece M.
3 at a desired speed until the band saw blade 23 leaves the workpiece M, and when the band saw blade 23 has risen to a desired position on the workpiece M, sequence control is performed so that the band saw blade 23 is stopped. The method for controlling the cutting depth of a saw machine described in Section 1. 7 Input the saw blade position with respect to the workpiece M and the two dimensions of the shape of the workpiece M to the arithmetic processing device 49;
The positional relationship between the workpiece M and the band saw blade 23 calculated in step 9 is output to the sequence control circuit 107, and the band saw blade 23 is moved from the lowering start position to the workpiece M according to a command from the sequence control circuit 107. After the band saw blade 23 approaches a predetermined position on the workpiece M, the cutting speed of the saw blade is controlled to keep the cutting rate η constant. After cutting the workpiece M, the band saw blade 23 is raised at a desired speed to a position where it separates from the workpiece M, and the band saw blade 23 cuts a predetermined position on the workpiece M. A cutting control method for a saw machine that performs sequence control so as to stop the band saw blade 23 when the band saw blade 23 reaches a certain position. 8. The cutting control method for a saw machine according to claim 7, wherein rapid forwarding of the band saw blade 23 from a lowering start position to a position immediately before cutting into the workpiece M is performed by sequence control. 9 After cutting the workpiece M, remove the band saw blade 2 from the workpiece M.
Claim 7: Sequence control is performed to raise the band saw blade 23 at a desired speed to a position where the band saw blade 23 separates from the workpiece M, and to stop the band saw blade 23 when the band saw blade 23 has risen to a desired position on the workpiece M. The method for controlling the cutting depth of a saw machine described in Section 1.