JPS6288545A - Method of controlling rotational speed of cutter in end facing machine - Google Patents

Abstract

PURPOSE:To make possible to cut a workpiece always at an optimum cutting speed to aim at prolonging the life of a tip, by detecting the conveying speed of a plate material and changes in fabricating margin thereon so that when the cutting margin is excessive and the conveying speed increases, the rotational speeds of cutters on the excessive side and both sides are increased, respectively. CONSTITUTION:A feed speed detector 11 attached to an end facing machine, and cutting margin detectors 12a, 12b arranged at both sides of a material to be cut 4 are wired to a controller 13, and therefore, their signals are delivered to the controller 13 which therefore, an optimum cutting speed, and which therefore delivers signals to right and left cutter drive motors 3, respectively, so that a milling cutter 2 is rotated at the calculated speed mentioned above. That is, the controller 13 has cutting speeds V and cutting thicknesses S set to optimum values, and calculates a cutter rotational speed or a cutting speed V which provides an optimum tip life < f in association with an input signal, and delivers an output signal to a cutter drive motor, thereby the milling cutter 2 may cut a workpiece satisfactorily in accordance with the signal from the controller 13. Accordingly, it is possible to prolong the life of the tip as long as possible.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for controlling the rotational speed of a cutter of an end face cutting machine that cuts the side edge of a plate material, and more specifically relates to a method for controlling the rotational speed of a cutter of an end face cutting machine that cuts the side edge portion of a plate material, and more specifically relates to a method for controlling the rotational speed of a cutter of an end face cutting machine that cuts the side edge portion of a plate material. The present invention relates to a method for controlling the rotational speed of a cutter of an end face cutting machine that cuts, ie, trims, the side edge of a steel plate being transferred in a production line.

<Prior art> As shown in FIG. 5, a typical conventional method for cutting the side edges of a plate material such as this type of steel plate involves cutting the workpiece 4 on the left side,
A right pair of cutting heads l is provided, a milling cutter 2 is placed on the cutting head, and cutting is performed by rotating the cutter using a coupling, a speed reducer (not shown), etc. using a cutter drive motor. At this time, the desired product finishing width is set between the left and right seven milling force cutters 2 by a width moving device (not shown), and the milling cutter 2 is rotated at the initially set rotation speed and sent in the direction of the arrow by the pinch roll. The work material 4 that comes is cut.

Normally, the feed speed of the workpiece 4 changes during cutting,
The machining allowance (tl) at the left and right ends may change to the shape shown in FIGS. 6 and 7, but even in this case, the rotational speed of the milling cutter remains fixed at the initially set value.

<Problems to be solved by the invention> However, when the work material is a steel strip, the coiled steel strip is unwound and the respective flange ends are welded and connected. The trailing edge and the leading edge of the trailing steel strip do not match well, or the material itself is bent or bulged, and as shown in Figures 6 and 7, the machining allowance ftl becomes too large and cutting becomes impossible. Chip (cutting edge) damage may occur. Furthermore, if the feed speed of the workpiece 4 increases, cutting may also become impossible.

As a solution to such problems, machining allowance ftl
If the cutter rotational speed is increased in advance on the assumption that the cutter rotational speed is large, the chip thickness (S) becomes too small when the machining allowance [tl] becomes small, which has the disadvantage of shortening the life of the insert.

The present invention provides a method for controlling the cutter rotational speed of an end face cutting machine that does not cause cutting failure or chip loss caused by changes in the feed speed of the workpiece and changes in the machining allowance in conventional end face cutting machines. That is.

Means for Solving the Problems> In order to achieve the above-mentioned object, a method for controlling the cutter rotational speed of an end face cutting machine according to the present invention includes: A pair of cutters are installed on each side of the plate, and changes in the transfer speed and machining allowance of the plate are detected. When the machining allowance is excessive, the rotation speed of the cutter on the side with the excessive machining allowance is increased, increasing the transfer speed of the plate. When this occurs, the rotational speed of the cutter is increased to cut the side edges of the plate at a cutting speed that maximizes the life of the cutter.

For this reason, in this invention, the end face cutting machine is equipped with a feed speed detection type, a machining allowance detector and a rotation speed controller on both sides of the plate material, and the machining allowance (tl) of the workpiece material is adjusted continuously or at a constant feed speed. By detecting each interval, calculating the cutter rotation speed that provides the best cutting conditions with the ° controller, and driving the cutter drive moke at that rotation speed,
This is to achieve the above-mentioned purpose.

(O') As the feed speed detector, a measuring roll rotation generator is connected, and as the coverage area detector, the image sensor 1 that is responsible for the calculation of the controller that converts the shaded area into an electric signal is a micro Computers etc. are used.

Function> In the above configuration, the feed speed detector detects the speed of the workpiece, and the machining allowance detectors are provided at both ends of the workpiece, and detect the machining allowance (tl) individually. (If 0 becomes excessive, the controller increases the cutting speed on the excessive side, that is, the cutter rotation speed, so the thickness of chips becomes smaller and cutting becomes possible.

Furthermore, when the feed speed is partially increased, cutting becomes possible by increasing the cutter rotation speed.

Note that these are always controlled so that the optimum chip thickness is obtained.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The figure is a plan view showing the mechanism, and Figure 2 shows the chip thickness (31-
Chip life (Lf,), relationship diagram. FIG. 3 is a diagram showing the relationship between cutting speed M and chip life (Lf2). Figure 4 shows the machining allowance (
1), Cutting speed M1 Chip thickness (31, Chip life (Lf
) is a relational table for the case of S ) 0.2. Figure 2 shows that the chip thickness (S) is 0 even within the machinable range.
．． The range from 2 mm to 08 mm is the chip life (L f ,
) is long, and it deteriorates rapidly below 02 nm and above 0.81 nm, and when it becomes even larger, it becomes impossible to cut. If the thickness is less than 0.2 mm, the thin tsuba skin will have to be shaved off. After one cut, the material will undergo work hardening, and the hardened area will have to be scraped off, shortening the life of the tip. If it is .8 mm or more, the depth of cut will increase.Furthermore, if the chip thickness fsl becomes thick, the tip will be overloaded, minute chipping will occur, it will be in a worn state, and the life of the tip will be shortened.

Furthermore, as shown in FIG. 3, when the cutting speed decreases, wear rapidly decreases and the tip life (L f 2) rapidly increases.

In this way, there is a certain relationship between chip life (Lf), chip thickness (Sl), and cutting speed M, and the following relational expression (1) is established between chip thickness (Sl) and cutting speed. It has been established.

Chip thickness (S), cutting speed M1 machining allowance (tl, feed speed (F), cutter diameter (Dl), and constant (q
As can be seen from this equation, there is a contradictory correlation in order to extend the chip life (Lf).

FIG. 4 shows the respective relationships when chip thickness: 3>0.2-.

When cutting the workpiece 4 at a constant feed speed (circle, constant cutter rotation), the machining allowance (tl) is large (
The chip thickness fsl becomes large, and if it becomes too large, the chip will break and the chip life (Lf) will become short.

To prevent chips from chipping, it is necessary to slow down the feed speed or increase the cutter cutting speed M, but the feed speed (F) is usually fixed from the line side and cannot be changed. Unable to do so, the rotational speed of the cutter drive motor 3 is increased and the cutting speed M is increased.As M is increased, the constant (Q is constant, so the chip thickness (S) becomes smaller, which is 0.2 as shown in Fig. 2). It falls into the chip long life range of 0.8 mm to 0.8 mm.

Here, the machining allowance (tl) is thick (
The situation has changed as the machining allowance +11 becomes smaller and the chip thickness (31 also becomes smaller and becomes 0.
If the thickness is less than 2 mm, the work-hardened layer described above will be cut and the chip life (Lf) will be shortened, so the cutting speed M is returned to its original value and reduced.

In this way, the present invention calculates the optimum cutter rotation speed using the above-mentioned formula (1), and performs the end face cutting process of the plate material based on this.The mechanism is as shown in Fig. 1. The cutting machine is equipped with a feed speed detector 11, and machining allowance detectors 12a and 12b are installed on both sides of the workpiece 4, and are connected to a controller 13 that is also installed by wiring. The signal is sent to the controller 13.

The controller 13 calculates the best cutting speed and sends signals to the left and right cutter drive motors 3 individually to rotate the milling cutter 2 at the calculated speed.

In the apparatus configured as described above, the controller 13 sets the cutting speed M and the chip thickness [31] to the optimum value [this value is calculated from the formula (1) by the feed speed fFl machining allowance ftl
depending on the input signal.
The cutter rotation speed, that is, the cutting speed M, at which the tip life (Lf) is the best is calculated, and the output signal is sent to the cutter drive motor 3 at full speed, so that the milling cutter 2 can perform the best cutting with the signal from the control 2313. reactor.

As another embodiment, the feed speed detector 11 for the workpiece material is
Even if it is not installed on this cutting machine, it can be substituted by receiving a signal from a separately installed work material feed speed control device.

<Effects of the Invention> As is clear from the above explanation, according to the control method of the end face cutting machine of the present invention, even if the machining stock becomes excessive, the cutting speed (that is, the cutter rotation speed) can be partially increased. This makes cutting possible. Even if the feed speed changes or the machining allowance changes, cutting is always performed at the optimal cutting speed, making it possible to dramatically extend the life of the insert.

[Brief explanation of drawings]

FIG. 1 is a plan view of an end face cutting machine used to carry out the method of controlling the rotational speed of the end face cutting machine of the present invention;
Figures 2 and 3 are characteristic diagrams showing the relationship between cutter cutting thickness and chip life and cutting speed and chip life, respectively, in the end face milling machine shown in Figure 1, and Figure 4 shows the machining allowance, cutting speed, chip thickness, and chip life. FIG. 5 is a plan view showing the configuration of a conventional end face cutting machine, and FIGS. 6 and 7 are sectional views of main parts showing the shape of the workpiece. In the drawing, 1. Cutting/\rad, 2... Milling cutter, 3 Cutter drive motor, 4 Work material, 11...
Feed speed detector, 12a, 12b - machining allowance detector, 13...controller. Patent applicant: Mitsubishi Heavy Industries, Ltd., acting agent

Claims (1)

[Claims] When cutting the side edges of the plate material to be transferred with a rotating cutter, a pair of cutters are provided on each side of the plate material, and changes in the transfer speed and machining allowance of the plate material are detected,
When the machining allowance is excessive, increase the rotation speed of the cutter on the side with the excessive machining allowance, and when the conveyance speed of the plate increases, increase the rotation speed of the cutter to cut the plate at a cutting speed that maximizes the life of the cutter. A method for controlling the cutter rotation speed of an end face cutting machine, which cuts a side edge.