JPH0255166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the depth of cut of a saw machine, and more specifically, the present invention relates to a method for controlling the cutting depth of a saw blade, and more particularly, various conditions related to cutting are stored in a built-in computer in advance, and the distance position of the saw blade in the cutting direction during cutting is controlled. This invention relates to a cutting control method for a saw machine that automatically controls the cutting speed according to the finger input from a computer obtained by inputting the following information.

In a saw machine that originally cuts a long material perpendicular to its longitudinal axis, it is rather rare for the saw blade to have the same cutting length from the start of cutting the material to the end of the cut.For example, when cutting a round bar, Even in the case of cutting, the cutting length is a point at the start of cutting, the cutting length gradually becomes longer, the cutting length becomes the longest while cutting the diameter part, and the cutting length gradually becomes shorter after the diameter part, until it becomes a point just before the cutting is completed. In most cases, the cutting length changes depending on the distance position of the blade in the cutting direction.

For example, the thick square pipe 1 shown in Fig. 1, the
In the case of H-shaped steel 3 as shown in the figure, since there is a hollow part, the cutting length (relaxation of the length of the line where the saw blade actually touches the material to be cut) is the height of the saw blade in the case shown in the figure. It varies greatly depending on location.

When the direction of movement of the saw blade is horizontal, the cutting length for the thick-walled rectangular pipe shown in Figure 1 is twice the wall thickness on the left and right sides, but if the cutting length is the upper and lower horizontal sides, then the dimensions of the material to be cut are In some cases, it can reach up to 10 times, and the same is true for the H-beam steel shown in Figure 2.

In order to avoid the large change in cutting length when moving the saw blade horizontally, if the diagonal cutting method shown in the figure is adopted, there is no sudden change, but the maximum and minimum cutting length during cutting There still existed multiples of the length.

Conventionally, in order to obtain efficient cutting even when the cutting length changes over time, for example, the current consumption of the saw blade drive motor and the cutting reaction force (reverse force) from the cutting surface corresponding to the cutting length of the saw blade have been A method has been devised in which the amount of upward displacement of the saw blade caused by force) is input into a computer and the cutting speed is adjusted to fully utilize the cutting ability of the saw blade, but this method is expensive and requires high-quality processing that can handle complex calculations. It required a large computer, and maintenance and inspection were not easy.

Moreover, with the conventional method, for example, when the saw blade comes into contact with the material to be cut for the first time after descending, no matter how fast the computer's reaction is, it will react quickly after contact, and the saw blade will react quickly after contact. There was an inconvenience in that it was not possible to prevent spills from occurring.

The present invention has been made to overcome the above-mentioned disadvantages, and preferred embodiments will be described in detail below based on the drawings.

FIGS. 1 and 2 illustrate a thick square pipe 1 and an H-beam 3 fixed to a main body vice bed 7 of a so-called horizontal bandsaw machine 5 of a vertical descent type as shown in FIG. 3. , a to f, and a' to i' indicate the traveling positions of the band saw blade 9.

In a, the band saw blade 9 is idle cutting and is nearing its end.
From this position, the descending speed must be slowed down.

b is the height position where the cutting length stops changing from the state where it had gradually increased after the start of cutting.

c is the height position that changes to the cutting length of only both side walls of the thick square pipe 1.

d is the height position when the horizontal thick part of the bottom surface is added to one side wall.

e indicates the height position of the bandsaw blade when the horizontal thick part of the one side wall and the bottom surface has a constant cutting length and does not change.

f indicates a state in which the cutting length becomes zero upon completion of cutting.

Since a' to i' are largely the same as above, we will not repeat their explanations, but as explained for thick-walled square pipe 1, the material (including processing method and heat treatment state), shape (round , square, hexagonal, section steel sections, etc.),
The cutting speed ( For example,
The computer stores a list such as mm/min from b, mmm/min from c, and nmm/min from c.

Now, referring to FIG. 3, as mentioned above, the so-called horizontal bandsaw machine 5 of the vertically descending type generates a general fluid pressure in the fluid pressure cylinder 13 while circulating the band saw blade 9 with its inherent downward slope to the left. Fluid from the supply device 15 is inserted to raise the housing 17, and fluid from the hydraulic cylinder 13 is discharged via a control valve 21 of the overall lowering drive 19.

The control valve 21 herein is different from a flow rate control valve using an orifice, and has a function similar to a measuring valve or pump that discharges a fixed amount of liquid with each revolution of the shaft. It means a valve.

The general computer 23 includes an input device 25 for inputting cutting conditions such as the material, shape, and dimensions of the material to be cut, grade of the saw blade, and running speed of the saw blade, and a storage device 27 for storing the input cutting conditions. , a comparison device 29, and a command device 31. The command device 31 instructs an electric motor 33, such as a pulse motor or a DC motor, which drives the shaft of the control valve 21, to discharge fluid at a desired rate per minute. Command the rotation speed corresponding to the amount.

A rack 37 is installed parallel to the piston rod 35 of the fluid pressure cylinder 13, and the pinion 4
The heights of a, b, c, etc. are determined by rotating the axis of the pulse oscillator (encoder) 37 through 1, and taking the point where the reference side main body vice back surface 11 intersects the main body vice bed 7 top surface in FIG. The current position of the bandsaw blade is input into the computer 23 from time to time.

According to the cutting depth control method of the present invention described in detail above, a large number of recommended cutting speeds are classified according to the material, shape, and size of the material to be cut, and the grade of the bandsaw blade, and are divided into lists according to the height position of the material. Since the information is pre-entered and memorized, even workers who are inexperienced in cutting with band saw blades can
By simply inputting the above-mentioned cutting conditions into a computer, retrieving the corresponding program, and starting it, the cutting feed rate is automatically selected each time the band saw blade reaches a change in cutting length, making it easy to perform efficient cutting work. The effect that can be achieved is obtained.

Furthermore, as mentioned above, the computer of the embodiment of the present invention is a relatively simple computer that automatically operates based on the only information that detects and notifies the height position of the band saw blade while it is descending. In terms of maintenance, we were also able to overcome the disadvantages of the conventional system.

Although this embodiment describes the raising and lowering of the housing using fluid pressure, it is also possible to raise and lower the housing by means of screw feed, and it is clear that it can be used not only for band saws but also for reciprocating saws. be.

Furthermore, it is clear that even if the cutting depth is in the horizontal direction, the height position of the saw blade can be read as the distance position in the cutting direction.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the method of the present invention when the material to be cut is a thick square pipe, Fig. 2 is an explanatory diagram of the method in the case of H-beam steel, and Fig. 3 is an explanatory diagram of an embodiment of the method of the present invention. It is an explanatory diagram. Explanation of the symbols representing the main parts of the drawing, 5...Horizontal bandsaw machine, 11...Back side of reference side vise, 19...
Lowering drive device, 21...control valve, 23...computer, 37...pulse oscillator (encoder).

Claims (1)

[Claims] 1. A method for controlling the cutting speed of a saw machine, depending on the material, shape, and dimensions of the material to be cut, and the running speed of the saw blade.
A standard cutting speed as a function of the cutting direction distance position of the saw blade during cutting is memorized, the above cutting conditions are input, and the numerical value of the cutting direction distance position of the saw blade during cutting is sent to the transmitting device. A method for controlling the cutting speed of a saw machine, characterized in that the cutting speed is automatically controlled by inputting the reference cutting speed value from a computer every moment through a computer.