JPS5853968B2 - Automatic band saw cutting method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for cutting objects made of metal or ferrous metal.
This invention relates to an improvement in a so-called automatic band saw cutting method and its device, in which a band saw made of a flexible endless belt of steel or the like is continuously forced to circulate between groove wheels and gradually lowered as a whole to perform a desired mechanical cut.

That is, as shown in FIG. 1, the guide tubes 3, 3 are fitted onto the guide columns 2, 2 erected on the base 1 so as to be able to rise and fall freely, and the housing 4 is held in the guide tubes 3, 3. The groove wheels 5 and 6 are supported at both ends of the housing 4, and the band saw 1 is wound endlessly between the two groove wheels.While the band saw 7 is forced to circulate, the housing 4 is moved as the hydraulic cylinder 8 contracts. In an automatic band saw device of the type that cuts the workpiece A on the mounting table 9 by gradually lowering the band saw at a constant speed, when the band saw γ is placed parallel to the top surface of the workpiece A and cut, the cutting When the width is relatively maximum, as the cutting operation progresses, chips generated in the cutting groove stick to and become trapped in the band saw blade (clogging).
Because of this, the sharp edges of the band saw blades that are continuously formed to protrude are connected in a straight line, and therefore each band saw blade cannot reliably bite into and cut the workpiece A, resulting in the required cutting. There were some drawbacks that made it less effective.

For this reason, in the past, the applicant of the present invention did not attach the housing 4 directly to the guide tube 3, but fixed the frame 10 horizontally to the bridge between the upper ends of the guide tubes 3 and 3 as shown in FIG. , the catch plates 12 and 13 are erected and fixed at three locations on both left and right end positions and the middle position of this frame 10, and the intermediate catch plate 1
2 rotatably supports the crank plate 14, and the intermediate catch 12
Both end catch seats 11, which are provided to protrude upward even larger than the above,
Suspension arms 16 and 17 are suspended from 13 via pivots 15 and 15, and the housing 4 is suspended from the suspension arms 16 and 17 via pivots 18 and 18, and the eccentric position of the crank plate 14 and The lower ends of the suspension arms 16 and 17 are pivotally connected by connecting rods 19 and 20, and during cutting operation, the crank plate 14 is rotated by a motor, and the rotational movement of the crank plate 14 is transferred to the connecting rods 19 and 20. They have devised and filed an application for a system in which the signal is transmitted to the suspension arms 16, 17 through the pendulum, causing the suspension arms 16, 17 to perform a pendulum motion, thereby regularly swinging and tilting the housing 4.

In this mechanism, the swinging body 21 including the four wheel pairs 5, 6, the band saw 1, and the housing 4 moves one side (the right end side in the drawing) from the conventional horizontal position to
After partially cutting the workpiece A by swinging and tilting while gradually deepening the angle from →@→O, the object A is reversed and placed in a horizontal position again, and then the other side (the left end side in the drawing) → Cross over ○ and make partial cuts by tilting the angle deeply in the same way,
Complete cutting of the object A is achieved by repeating the partial cutting of this left-right reciprocating oscillating and tilting motion.

By repeating the tilting movement between 0 and 6 in this way, even if the length of the band saw 1 protruding into the workpiece A increases as cutting progresses, the band saw T angle changes momentarily. Therefore, the length over which the band saw 7 cuts the object A is always kept short, and because of this partial cutting, the band saw 1 cuts the object A even if it is inside the object 7 before it becomes clogged. Complete cutting.

The cutting locus of the above device in the workpiece A is as shown in Figure 2. If cutting starts from point a, it reaches point b1 and reverses, reaches point 01, and then reverses toward point b2. As the cutting groove deepens.

As is clear from this cutting trajectory diagram, the amount that is cut while the swinging body 21 swings back and forth one time from side to side is shown by the diagonal line if we take the range from point b1 to point b2 via point b1, for example. Become.

As is clear from this figure, the cutting depth 11 on the reverse side of the 11 points is much smaller than the cutting depth 12 on the b2 point side, and it can be seen that the cutting depth varies from side to side.

This variation inevitably occurs because the amount of descent of the entire swinging body 21 on the c1 point side is small, whereas it is large on the b2 point side.

In view of this, the present invention equalizes the cutting depths on both the left and right sides to match the deeper cutting depth described above, thereby increasing the cutting amount during one reciprocating swinging and tilting of the swinging body, thereby increasing the cutting capacity. This makes it possible to cut the object A at high speed.

Hereinafter, the present invention will be explained using FIGS. 3 and 4. The upper ends of swing links 22 and 23 are supported by the guide tubes 3 and 3 via pivots 24 and 24, respectively. The lower end of .23 is supported by the bracket 26 of the swinging body 21' in a horizontal position via a pivot 25.25, and the housing 4 is mounted on the pedestal 21 that rigidly connects the left and right guide cylinders 3.
A bracket 29 is inserted through the elongated hole 28 and placed on top of the bracket 29, and a crank plate 30 connected to a motor 31 is pivotally supported by the bracket 29. A bracket 32 is also provided to protrude from the upper surface of the housing 4. The eccentric position of the crank plate 30 and the bracket 32 are pivotally connected by a connecting rod 33.

Further, the cam 34 is pivotally supported on the frame 2γ, and the cam 34 is interlocked with the rotating shaft of the crank plate 30 via the sprockets 35a to 35d and the chinos 36a to 36c, so that the crank plate 30 and the cam 34 are synchronously operated. A roller 38 is pivotally supported at the tip of the piston rod 3T in the hydraulic cylinder 8, and the swinging body 21' is weighted to the hydraulic cylinder 8 so that the cam 34 rests on the upper part of the roller 38. It is posted on.

The cam 34 is a circular cam plate as shown in FIG. 6, and has two recesses formed with an angular phase of 180 degrees. 39, 39 are provided with guide portions 40.degree. 40 for pulling out as the cam 34 rotates.

41 is a gripping member for the piston rod 31.

In addition, although the above-mentioned swing links 22 and 23 are installed on the front side of the guide tubes 3 and 3 in the drawing, they are also installed on the front side of the guide tubes 3 and 3.
A swing link is also provided on the back side of 3 in parallel with the swing links 22 and 23.

Furthermore, a shock absorber 42 is provided between the guide cylinder 3 and the swinging body 21 to smooth the movement of the swinging main body 21.
It shall absorb the shock during rocking.

In the above configuration, when the swinging body 21' is in a horizontal position as shown in FIG.
It is placed in contact with the center between 39 and 39.

When the crank plate 30 begins to rotate in the direction of the arrow in FIG. 3 from this state, the connecting rod 33 is pushed and the swinging body 21' begins to move to the right in the drawing, causing the swinging arms 22 and 23 to perform pendulum motion. The pendulum movement causes the right end of the swing body 21 to go down, the left end to begin to rise, and the swing body 21 to begin tilting.

Further, the contraction movement of the hydraulic cylinder 8 is added to this tilting movement, and the entire swinging body 21 starts to descend at a constant speed.

For this reason, the band saw 1 starts biting into the object A, and a
Cutting is performed from the point toward the b1 point.

When the crank plate rotates 90 degrees and advances to the zero cutting point, the oscillating body 21 reaches the maximum inclination angle as shown in FIG. When the rod 33 is pulled and the swinging body 21 is pulled back, it returns to the horizontal position again.

However, when the swinging body 21 reaches the maximum inclination angle, the cam 34 is rotating by the same <90 degrees in conjunction with the crank plate 30, so the roller 38 of the piston rod 3γ enters the concave portion 39 of the cam 34. We are now in a position to do so.

Therefore, apart from the constant speed lowering caused by the contraction of the hydraulic cylinder 8, the swinging body 21 can be lowered by its own weight by the depth of the recessed part 39, and the band saw γ can be deeply cut into the workpiece A by the dead weight of the swinging main body 21. Since the workpiece A is cut under the action of its own weight, the amount corresponding to the depth of the concave portion 39, that is, the fifth Cutting is performed from point b1 to point b1' in the figure, and then the roller 38 is moved from the recessed part 39 to the guide part 4.
0, the swinging body 21 moves into the concave portion 3.
The swinging body 21 is pushed up to a depth of 9, and the swinging body 21
Due to the rotation of , and the contraction of the hydraulic cylinder 8, it tilts in the opposite direction to that described above and descends, performing cutting from point b1' to point 01 in FIG.

When the point 11 is reached and the swinging body 21 begins to return to the horizontal position from the maximum inclination angle, the roller 38 reaches the position where it enters the recess 39 of the cam 34. The object to be cut A can be significantly cut from point 11 to point 017 by lowering its own weight.

Cutting is performed by repeating the above steps.

In the above embodiment, the weight drop of the swinging body 21 starts from the moment when the maximum swing tilting angle is reached, but even if the weight fall is completed just before that, the weight fall will still continue before and after the swinging body 21. may be performed.

Further, in the above embodiment, the cam 34 is used to control b of the swinging body 21.
1 to point b1', the piston rod 3γ was connected directly to the frame 21 without using the cam 34, and the contraction speed of the hydraulic cylinder 8 was varied to achieve the cutting trajectory shown in FIG. It may be possible to obtain it.

The present invention is as described above, and when cutting the material to be cut by adding a constant speed downward movement of the pedestal by the fluid pressure cylinder to the horizontal oscillating and tilting movement of the oscillating body by the crank mechanism, the oscillating body is subjected to maximum oscillation. The descending speed of the platform is kept at half speed for a certain period of time either before or after reaching the tilting angle, so that the swinging body moves to the left or right from the maximum swinging tilt angle at which it reaches the right or left direction. As is clear from the comparison between Fig. 2 and Fig. 5, the cutting depth at the part that reverses to the right is significantly deeper than that of the conventional method. The cutting depths in the directions are approximately uniform as shown by the diagonal lines in FIG. 5, thus increasing the cutting ability and making it possible to cut the workpiece at high speed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an automatic band saw cutting device for which the applicant of the present invention has filed an application in the past, FIG. 2 is a cutting locus diagram thereof, FIG. 3 is a schematic diagram showing an embodiment of the present invention, and FIG. The figure is a perspective view of the main part, FIG. 5 is a cutting locus diagram thereof, and FIG. 6 is an enlarged view of the main part. 1...Guide support erecting base, 2...Guide support, 7...Band saw, 8...Fluid pressure cylinder, 21...・Swinging body, 22, 23...
... Swinging member, 2γ ... Frame, 30.33
......Crank mechanism, 34...Cam, 3
1... Piston rod, 38... Roller, 39... Concave portion.

Claims (1)

[Claims] 1. A swinging body equipped with an endless band saw that circulates is held via a swinging member on a pedestal that moves up and down along a guide column, and the swinging member is interlocked and connected to a crank mechanism. , a fluid pressure cylinder is interposed between the pedestal and the guide column erecting base, so that the horizontal oscillating and tilting movement of the oscillating body by the crank mechanism is combined with the constant speed downward movement of the pedestal by the fluid pressure cylinder. In addition, while cutting the material directly below, the lowering speed of the gantry is set at half speed for a fixed period of time either before or after the time when the oscillating body reaches the maximum oscillating tilt angle, or before and after that time. An automatic band saw cutting method characterized by keeping the 2. A swinging body equipped with an endless band saw that circulates, a pedestal that holds this swinging body via a swinging member and moves up and down along a guide column, and a pendulum motion is imparted to the swinging member. a crank mechanism for swinging and tilting the swinging body from side to side, a circular cam driven in synchronization with the crank mechanism and having recessed portions at an angular phase of 180 degrees on its circumferential surface, and a guide. An automatic band saw cutting device including a hydraulic cylinder that stands upright on a support base and whose piston rond contacts the cam from below via a roller.