JP2728255B2 - Cutting control device for band sawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a cutting control device in a band sawing machine for cutting various steel materials.

(Prior Art) Generally, a cutting condition index of a band sawing machine for cutting various steel materials is determined by a saw speed and a cutting rate. In addition, as a method of giving a cut to a work with a cutting tool, a constant cutting method and a constant load method are known, and a method of giving a cut to a work with a band saw blade in a band saw machine is the latter constant load method described above. Has adopted. At present, the depth of cut, that is, the cutting rate is not directly controlled.

(Problems to be Solved by the Invention) By the way, even if the above-mentioned cutting control in the band saw machine is directly performed, it is considered very difficult to match the cutting rate to a target value because of the constant load method.

Further, even if the target cutting rate is used, the target cutting rate is an average cutting rate for all the cross sections, so that there is a problem that partial overcutting is apt to occur.

Further, since no particular consideration is given to the wear of the band saw blade, an excessive back force is generated for the band saw blade with advanced wear, and it is easy to induce bending. In addition, there are various problems that it is impossible to know even if the cutting amount, the backing force and the cutting rate exceed the limit values.

An object of the present invention is to improve the above-described problems, while performing a cutting process on a workpiece with a band saw blade in a band saw machine, detect an actual pressure when the saw blade housing descends with a pressure sensor, Band saw that calculates the backing force based on the detected actual pressure, calculates the partial cutting rate from the backing force, and automatically performs the cutting control based on the partial cutting rate. An object of the present invention is to provide a cut control device for a board.

[Constitution of the Invention] (Means for Solving the Problems) The present invention has been made in view of the conventional problems as described above, and has a movable band saw blade and can swing up and down around a hinge pin. A saw blade housing, a hydraulic cylinder for vertically moving the saw blade housing, a pressure sensor for detecting a pressure of the hydraulic cylinder when the saw blade housing is lowered, and a hydraulic pressure for discharging pressure oil in the hydraulic cylinder. A flow control valve disposed in a circuit, an angle detector for detecting an inclination angle of the band saw blade, a saw blade motor for driving the band saw blade, and a control device for controlling the flow control valve A cutting control device for a band sawing machine comprising: a first calculation processing means for calculating a moment force of rotation of the saw blade housing when no load is applied; Based on the moment force calculated by the first processing means, the inclination angle of the band saw blade detected by the angle detector, the pressure detected by the pressure sensor, and the constant input from the setting input unit, A second arithmetic processing means for calculating a component force, an actual back force calculated by the second arithmetic processing means, a cutting constant previously input from the setting input unit, and a rotation of the saw blade motor. A third arithmetic processing unit for calculating an actual partial cutting rate based on the saw speed of the band saw blade, and a database; and an actual partial cutting rate calculated by the third arithmetic processing unit. By comparing the target cutting rate stored in the database with the target cutting rate, the opening degree or saw speed of the flow control valve is controlled so that the actual partial cutting rate becomes the target cutting rate.

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

Before describing the configuration of the present invention, the basic concept of achieving the present invention will be described with reference to FIG.

FIG. 2 shows a hinge type band sawing machine in which a work W such as a round material is cut by a band saw blade T, and shows a state in which moments are balanced during a cutting operation.

In FIG. 2, W: own weight of the saw blade housing F _H : back force F: force by the elevation correction spring R: reaction force of the swing hydraulic cylinder d: radius of a circle contacting the band saw blade T from the hinge pin l: center of the hinge pin from a distance of up is under its own weight W of the saw blade housing E: distance from the center of the hinge pin to is under the back component force F _H G: from the center of the hinge pin to is under the reaction force of the swing hydraulic cylinder Distance S: Angle formed between the contact point where band saw blade T is in contact with a circle having a radius d from the center of the hinge pin and the horizontal line after cutting work W with band saw blade T θ: Back force of band saw blade T is applied The angle between the straight line connecting the point and the center of the hinge pin and the band saw blade T.

In FIG. 2, if it is assumed that there is mutual contact during the cutting operation, the following equation is established.

W · lcos (S-θ) + FG = F _H · cos θ · E + RG
… (1) From formula (1), the back force F _H is Becomes

In equation (2), W · l is an unknown and
L is the moment force on the elbow axis of the saw blade housing.

The value of W · l is not always constant, but changes due to the movement of the blade guide, and changes due to a machine error due to the resistance of the hinge portion of the band sawing machine. Therefore, it is necessary to measure each time.

Therefore, in order to obtain W · l, measurement is performed once at no load when the back component force F _{H is} almost zero. The balance formula at that time is
In the above equation (1), by setting F _H ≒ 0, W · lcos (S ₀ −θ ₀ ) + F ₀ · G = R ₀ · G. Becomes

In the equation (3), since S ₀ , θ ₀ , R ₀ , F ₀ and G are predetermined values, they can be set to M ₀ because they are constant values.

Thus, the above equation (2) is Becomes

In the formula (4), assuming that the pressure receiving area of the swing hydraulic cylinder device is As and the primary pressure is P, Becomes

If R ₀ = As · P _{0 in the} above equation (3), equation (3) becomes Becomes

Accordingly, in the above (5), by detecting the internal pressure P of the swing hydraulic cylinder device, it is possible to arithmetically processing the back component force F _H. (Θ, E and F ₀ , F are obtained by measuring the descent angles.) The back force F _H and the partial cutting rate C are represented by the following equations.

However, V: saw speed, K: the cuts constant equation (7), when the cut constant K, the saw speed V is constant, partial cut rate C is proportional to the back force component F _H. Further, when performing the cutting control in which the cutting constant K is constant and the total back force is constant, the partial cutting rate C is proportional to the sawing speed V.

And Thus, it is possible to make the near-not a Keru control for the target cut rate by grasping the back component force F _H.

Next, FIG. 1 shows a block diagram of a configuration of a cutting control device in a band saw machine.

In FIG. 1, on the base 3 of the band saw machine 1,
The work W is placed, and the work W is clamped by the fixed vice 5 and the movable vise 7.

A vertically movable saw blade housing 9 for cutting the workpiece W is provided, and a rotatable drive wheel 11 and a driven wheel 13 are mounted on the saw blade housing 9. A band saw blade T is wound around the driving wheel 11 and the driven wheel 13. A saw blade motor 15 such as a servo motor having an encoder for driving the drive wheel 11 is connected to the drive wheel 11 in an interlocking manner.

By driving the saw blade motor 15 with the above configuration, the drive wheel 11 rotates in a certain direction as shown by the arrow, and the band saw blade T travels from left to right.

A bracket 17 is attached to the lower right end of the saw blade housing 9, and the bracket 17 is pivotally supported by hinge pins 19. Thus, the saw blade housing 9 is moved up and down with the hinge pin 19 as a fulcrum. Saw blade housing 9
In order to detect an angle S when the is moved up and down, a rotary encoder 21 as an angle detector is attached to the hinge pin 19.

In order to control the vertical movement of the saw blade housing 9, a hydraulic circuit 23 is provided in the saw blade housing 9. For example, a hydraulic cylinder 27 is provided on the lower right side of the saw blade housing 9 via a piston rod 25 as a cylinder device of the hydraulic circuit 23. One end of a pipe 29 is connected to, for example, a left side wall of the hydraulic cylinder 27, and the other end of the pipe 29 is connected to a hydraulic pump 31. A check valve 33 is provided in the middle of the pipe 29.

A motor 35 for operating the hydraulic pump 31 is linked to the hydraulic pump 31. One end of a pipe 37 is connected to the hydraulic pump 31, and the other end of the pipe 37 is connected to a filter 39. The filter 39 is provided in the tank 41.

One end of a pipe 43 is connected to a right side wall of the hydraulic cylinder 27, and a pressure sensor 45 such as an elastic body type for detecting a pressure in a hydraulic chamber 27A in the hydraulic cylinder 27 is connected to the other end of the pipe 43. Is connected. One end of a pipe 49 is connected to a branch point 47 in the middle of the pipe 43.
Is connected to the B port of the 4-port 3-position electromagnetic switching valve 51.

Solenoids SOL ₁ , SO
L ₂ is provided for each. One end of a pipe 53 is connected to the T port of the 4-port 3-position electromagnetic switching valve 51, and the other end of the pipe 53 is connected to the tank 41. Adjustable flow control valve as cutting control means in the middle of pipe 53
55 are provided.

With the above configuration, the motor 35 is driven and the hydraulic pump 31
Is activated, the oil in the tank 41 is filtered and the piping 37
And is discharged to the pipe 29. The oil discharged to the pipe 29 is supplied to the hydraulic chamber 27A of the hydraulic cylinder 27 and pushes up the piston rod 25, whereby the saw blade housing 9 is raised around the hinge pin 19 as a fulcrum.

When the motor 35 is stopped and the solenoid SOL ₁ of the 4-port 3-position electromagnetic switching valve 51 is excited, the B port and the T port communicate with each other, and pressure oil flows from the hydraulic chamber 27A of the hydraulic cylinder 27 to the pipe 43. The pressure oil flowing into the pipe 43 is returned to the tank 41 via the pipes 49 and 53 and the flow rate control valve 55, so that the saw blade housing 9 is lowered by its own weight. At this time, the lowering speed of the saw blade housing 9, that is, the amount of cut is controlled by adjusting the flow control valve 55.

The saw blade motor 15, rotary encoder 21, pressure sensor 45, and flow control valve 55 are connected to a central processing unit (hereinafter, referred to as CPU) 61 of a control device 59 via interfaces 57A, 57B, 57C, and 57D, respectively. ing.

A setting input unit 63 for inputting a preset setting value is connected to the CPU 61. Further, the CPU 61 uses the band saw machine 1 to perform a cutting process on the work W in advance with no load in which the backing force is almost zero, and to calculate a moment force M ₀ on the hinge pin 19 of the saw blade housing 9. Arithmetic processing means 65 is connected.

The CPU 61 has a second arithmetic processing means for arithmetically processing the actual back force F _H generated when the workpiece W is cut by the band saw blade T by lowering the saw blade housing 9 of the band saw machine 1. 67 connected, plus the actual back force
Third processing means 69 for processing the actual partial cut rate C and the F _H based on is connected.

The CPU61 is connected database 71 for storing a target cut rate data due to preset various steel material, and display such detected back component force F _H and partial cutting rate C is a display device 73 is connected.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

In FIG. 3, and inputs a preset value G at step S _1, As and the like from the setting input unit 63. Step S ₂ in determining whether to first cutting, it is determined to perform the cutting of the first, is a back component force F _H is approximately 0 in the work W by the band saw machine 1 at Step S ₃ No The first trial cutting is performed under load. As a result, the process proceeds to step S _4,
Θ ₀ F ₀ described with reference to FIG. 2 is measured based on the angle S ₀ detected by the rotary encoder 21. Also step S ₁
G and As are input in advance by the setting input unit 63. Note that As is a pressure receiving area in the hydraulic chamber 27A of the hydraulic cylinder 27. And Thus, these θ ₀ in step S _5,
The values of F ₀ , S ₀ , G and As are taken into the first arithmetic processing means 65. Further, the first arithmetic processing means 65 has a pressure sensor 45
In By it is taken sensed pressure P _0, moment force M ₀ to the first processing means 65 in the hinge pin 19 of the saw blade housing 9, Is calculated.

Then, back in front of the step S _2, is made a determination of the cutting in step S ₂ again, the process proceeds to step S _6. In step S ₆ in band saw 1 performs the actual cutting the workpiece W. In step S _7, the pressure P is detected by the pressure sensor 45 at the time of cutting. Also, by the rotary encoder 21,
Detects the angle S at that time, based on the value of the angle S, theta _0, F is obtained. Further, in step S _8, E being input from a preset input unit 63, G and
The value of As, the value of the detected angle S, θ and F measured based on the value of the angle S, the value of M ₀ calculated by the first calculation processing means 65, Each value of the obtained pressure P is taken into the second arithmetic processing means 67,
Actual back force F _H And can be detected.

Next, in step S _9, the actual and the back component force F _H, which is processing by the second processing means 67, and cutting the constant K that has been previously inputted from the setting input unit 63 includes the saw blade motor 15 The respective values of the saw speed V input by the input encoder are taken into the third arithmetic processing means 69, so that the actual partial cutting rate C becomes Is calculated.

The operators F _H and C computed by the second computation processing means 67 and the third computation processing means 69 are displayed on, for example, the display device 73, so that the operator can visually confirm them.

In step S _10, compared with the third actual partial cut rate C and the target cut rate data that is stored in the database 71 that is the arithmetic processing by the arithmetic processing unit 69. As a result, C ≒ if the target cut rate ended proceeds to step S _11, C ≒ actual partial cut rate in step S ₁₂ if the target cut rate C
In order to make the adjustment as close as possible to the target cutting rate, the command signal may be, for example, a flow control valve 55 as a cutting control.
To adjust the opening of the flow control valve 55 to control the cutting, or to adjust the sawing speed V, the command value is sent to the sawing speed motor 15 to adjust the rotation speed and Speed V
By performing control, again compared is performed back to the front of the step S _10.

Thus, it performed in advance once cutting in no-load, arithmetically processes moment force M ₀ for the hinge pin 19 of the saw blade housing 9. As a result, by detecting the pressure when the saw blade housing 9 descends without being affected by the fluctuation of the moment force of the saw blade housing 9 with respect to the hinge pin 19 and not influenced by the variation in the resistance of the hinge pin 19, the actual pressure is detected. The back force can be detected. Further, by calculating the actual partial cutting rate from the actual back force, the depth of cut can be controlled so that the actual partial cutting rate approaches the target cutting rate.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiment, in the present invention, the first arithmetic processing means for calculating the rotational moment force M ₀ of the saw blade housing 9 when there is no load.
65, the moment force M ₀ calculated by the first arithmetic processing means 65, the inclination angle S of the band saw blade T detected by the angle detector 21, the pressure detected by the pressure sensor 45, and input from the setting input unit 63. second arithmetic processing means 67 and, the second processing means 67 and the actual back force component F _H calculated by the setting input unit 63 for calculating the actual back component force F _H on the basis of which it is constant is Cutting constant K and saw blade motor previously input from
A third arithmetic processing means 69 for calculating the actual partial cutting rate C based on the saw speed V of the band saw blade T by 15 rotations, and a database 71 are provided. The calculated actual partial cutting rate C is compared with the target cutting rate stored in the database 71, and the opening degree or the saw speed of the flow control valve 55 is adjusted so that the actual partial cutting rate C becomes the target cutting rate. V is controlled, so that the band saw blade T
The cutting rate can be controlled at the time of cutting the work W. In other words, in which the actual back component force F _H is able to perform the cut control is controlled so as not to exceed the limit, it is possible to perform good cutting of efficiency without cause switching bend.

Further, according to the present invention, the moment force M ₀ of the rotation of the saw blade housing 9 at the time of no load is calculated, and the actual back force F _H is calculated.
Thus, the actual back force can be accurately detected without being affected by variations in the moment of the saw blade housing 9 with respect to the hinge pin, resistance of the hinge pin, and the like.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an embodiment embodying the present invention. FIG. 2 is an explanatory diagram showing a basic concept for carrying out the present invention. FIG. 3 is a flowchart for explaining the operation of this embodiment. DESCRIPTION OF SYMBOLS 1 ... Band saw machine, 15 ... Saw blade motor 19 ... Hinge pin, 21 ... Rotary encoder 23 ... Hydraulic circuit, 27 ... Hydraulic cylinder 45 ... Pressure sensor, 55 ... Flow control valve 59 ... Control device, 61 ... CPU 65 ... First Arithmetic processing means 67 ... second arithmetic processing means 69 ... third arithmetic processing means 71 ... database

Claims (1)

(57) [Claims] 1. A saw blade housing (9) having a freely movable band saw blade (T) and swingable up and down around a hinge pin (19), and a saw blade housing (9) for vertically moving the saw blade housing (9). A hydraulic cylinder (27), a pressure sensor (45) for detecting the pressure of the hydraulic cylinder (27) when the saw blade housing (9) is lowered, and a hydraulic pressure for discharging hydraulic oil in the hydraulic cylinder (27) Flow control valve (55) arranged in the circuit
An angle detector (21) for detecting an inclination angle (S) of the band saw blade (T); a saw blade motor (15) for driving the band saw blade (T); and the flow control valve ( 55) a cutting control device for a band sawing machine comprising a control device (59) for controlling a cutting force (M) of the saw blade housing (9) when no load is applied. ₀ ) first arithmetic processing means (65)
The moment force (M ₀ ) calculated by the first arithmetic processing means (65), the inclination angle (S) of the band saw blade (T) detected by the angle detector (21), and the pressure sensor ( The second arithmetic processing means (67) for calculating the actual back force (F _H ) based on the pressure detected by (45) and the constants (E, G, A _S ) inputted from the setting input section (63). ), The actual back force (F _H ) calculated by the second calculation processing means (67), the cutting constant (K) previously input from the setting input section (63), and the saw blade motor. The third arithmetic processing means (69) for calculating the actual partial cutting rate (C) based on the saw speed (V) of the band saw blade (T) by the rotation of (15), and the database (71) And the actual partial cutting rate (C) calculated by the third arithmetic processing means (69) and the database (71). It compares the target cut rate being the opening or Nokosoku the like real part cut rate (C) is the target cut rate flow control valve (55) (V)
A cutting control device for a band sawing machine, characterized in that the cutting device is configured to control the cutting force.