JPH0714571B2 - Cutting method and device for band saw machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a band saw machine, and more particularly to cutting of a band saw machine that performs cutting while keeping a product of a cutting amount and a cutting length of the band saw blade substantially constant. The present invention relates to a control method and device.

(Prior Art) Conventionally, in the cutting processing of a band saw machine, a control method is generally used in which a cutting back force generated on a saw blade is detected and a cutting depth is controlled so that the cutting back force does not exceed a certain value. Are known.

In these control methods, the depth of cut increases when the cutting length is short. When the cutting length is long, the depth of cut is small. Due to the above items and, the cutting can be efficiently performed without applying an excessive load to the saw blade.

However, if the cutting length is long, the gullet portion of the saw blade is filled with chips and an upper slip phenomenon occurs, and as the cutting depth becomes smaller, the tip of the saw blade scrapes the work hardened layer by cutting. As a result, there is a problem that cutting efficiency is poor and tooth tip wear is accelerated.

Therefore, in order to solve the above problems, Japanese Utility Model Publication No. 59-9781, Japanese Patent Publication No. 60-500327, etc. (hereinafter referred to as "prior example")
As can be seen from the above, there has been proposed a structure in which the band saw blade is oscillated like a seesaw to hold the cutting length at an appropriate cutting length for cutting.

(Problems to be Solved by the Invention) However, in the conventional seesaw-like swing cutting, the seesaw-like swing cycle of the band saw blade is simply caused by swinging the band saw blade up and down (cutting direction) like a seesaw. It does not adopt a means for linking the speed with the saw blade speed. Therefore, there remains a problem that an appropriate cutting process cannot be performed according to the material.

That is, in the case of a work piece (material that is difficult to cut) that is prone to work hardening, the cutting length is maintained at an appropriate cutting length, and cutting is performed in a state where the tip of the tooth hardens into the work hardening layer. As described above, the cutting is performed under the condition that the cutting amount of the saw blade with respect to the workpiece is increased and the speed of the saw blade is decreased so as not to increase the load.

In the case of a workpiece (material that is easy to cut) made of materials that are easy to cut,
In order to maintain the cutting length at an appropriate cutting length and improve the cutting efficiency, cutting is performed under the condition that the cutting depth is reduced and the saw blade speed is increased.

However, in the above-mentioned prior art, since the band saw blade or the housing is oscillated like a seesaw to perform the cutting regardless of the saw blade speed, for example, the cutting is performed under the condition that the cutting depth is increased and the saw blade speed is decreased. When the band saw blade or the seesaw-like swing cycle of the housing is short when trying to go,
When the band saw blade swings like a seesaw in the cutting direction with respect to the workpiece, when the band saw blade cuts into the workpiece on one side of the workpiece, separates from the workpiece on the other side This is not desirable because the mode becomes frequent and the saw blades are separated from each other before the workpiece is sufficiently cut, and the cutting amount of the band saw blade tends to be small. .

Conversely, when trying to perform cutting under conditions that reduce the depth of cut and increase the saw blade speed, if the seesaw-like rocking cycle of the band saw blade or the housing is long, the band saw blade is cut off at one side of the workpiece. When cutting into the work piece, the band saw blade separates from the work piece in the other side part of the work piece, but the cutting time of the one side part compared to the case where the seesaw-like swing cycle is short Since the cutting length is long, the cutting length tends to be longer compared to when the cycle is short, despite the fact that cutting on one side progresses and swings like a seesaw. It tends to increase. Therefore, the cutting length is maintained at an appropriate cutting length, the cutting resistance is suppressed to a certain degree, and the saw blade speed is increased to perform efficient seesaw-like oscillating cutting. Under the condition of increasing the blade speed, it is not desirable that the seesaw-like oscillation period is long.

Therefore, in order to cut the workpiece while swinging the band saw blade in the cutting direction like a seesaw, when changing the saw blade speed according to the material of the workpiece, It is desirable to change the seesaw-like oscillation cycle of the band saw blade.

Therefore, an object of the present invention is to perform a cutting process while keeping the cutting length at an appropriate cutting length by interlocking the seesaw-like rocking cycle of the band saw blade in the seesaw-like rocking cutting process with the saw blade speed. An object of the present invention is to provide a cutting control method and device for a band saw machine, which can perform an appropriate cutting process depending on a material.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method of the present invention comprises making a cut of a band saw blade on a work piece, and a seesaw in a direction in which the band saw blade cuts into the work piece. Of the seesaw in the direction of cutting into the workpiece, the cycle of which has an inversely proportional relationship with the saw blade speed of the band saw blade. The cutting control method is performed as described above, and the product of the cutting amount of the band saw blade with respect to the workpiece and the cutting length is controlled to be substantially constant.

Further, the apparatus of the present invention includes a saw blade guide portion that guides the band saw blade on both sides of the workpiece, as well as including a band saw blade that cuts into the workpiece, and
A cutting control device for a band saw machine, which is provided with a swing drive device for swinging the band saw blade in a sawtooth direction in a direction of cutting into the workpiece by alternately moving the saw blade guide portions on and off in the cutting direction. Then, in order to control the product of the cutting amount of the band saw blade with respect to the workpiece and the cutting length to be substantially constant, the saw blade speed of the band saw blade and the seesaw-like oscillation period of the band saw blade have an inverse proportional relationship. It is provided with a related actuating device for interlocking the operation control part of the swing drive device and the drive part of the band saw blade so as to hold and perform the related operation.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, an outline of a band saw machine to which the present invention is applied will be described.

FIG. 1 is a front view of a horizontal band saw machine showing an example of the band saw machine.

In FIG. 1, the horizontal band saw machine 1 is roughly composed of a box-shaped base 3 and a cutting head 5, and the cutting 5 is swingable in the vertical direction on the base 3 via a hinge pin 7. Is supported by. A work table 9 on which the work piece W to be cut is placed is provided on the base 3, and the work table 9 has a fixed vise jaw 11f and a movable vise jaw 11m that can clamp and hold the work piece W. The vice device 11 including the The cutting head 5 includes housing parts 13 and 15, and the housing parts 13 and 15 are integrally connected by a beam member 17.
A control box 19 is provided on the 17 side.

A drive wheel 21 and a driven wheel 23 are respectively provided in the housing parts 13 and 15 of the cutting head 5 for the shaft 2.
It is rotatably installed via 5,27. Drive wheel
In order to easily attach and detach the endless band saw blade 29 wound around the driven wheel 23 and the driven wheel 23, the driven wheel 23
Is provided so as to be movable and adjustable in a direction in which it approaches and separates from the drive wheel 21. Although not shown in detail, as is well known, the movement of the driven wheel 23 is adjusted by rotating the tension handle 31 rotatably mounted on the housing portion 15.

The band saw blade 29 is guided and held by the fixed guide arm 33 and the movable guide arm 35 so that the blade edge is directed vertically downward, so that in the cutting region of the horizontal band saw machine 1, between the guide arms 33, 35. A cut portion is formed. Both of the guide arms 33, 35 are supported by a guide member 37 fixed to the beam member 17, and a band saw blade guide device 39, 41 for vertically twisting and guiding the band saw blade 29 is provided at a lower end portion thereof. Are provided respectively. The fixed guide arm 33 is fixedly supported by the guide member 37, and the fixed guide arm 33 is movable.
The position of the reference numeral 35 is fixedly fixed in the direction toward and away from the fixed guide arm 33 in order to adjust the cut portion of the band saw blade 29 according to the size of the workpiece W to be cut.

The cutting head 5 cuts the band saw blade 29 with respect to the work piece W and separates the band saw blade 29 from the work piece W by actuation of a hydraulic cylinder 45 equipped with a piston rod 43. It is configured to swing around in the vertical direction. That is, when pressure oil is supplied to the hydraulic cylinder 45, the cutting head 5 moves up, and by draining the pressure oil from the hydraulic cylinder 45, the cutting head 5 moves down by its own weight.

By the way, for example, in a work-hardening work material, if the depth of cut is small, the tooth tip of the saw blade cuts the work-hardened portion and wear is remarkable. It is desirable to cut at a low saw blade speed so that the cutting amount is large with the tooth tip protruding to the side and the load does not become large. That is, the saw blade speed needs to be adjusted according to the material of the workpiece.

Further, as described above, when the seesaw-like rocking cycle of the band saw blade or the housing is short, the cutting amount of the saw blade tends to be small, and conversely, when the seesaw-like rocking cycle is long, the cutting length is long. The cutting resistance tends to increase sharply.
Therefore, as a cutting condition, it is necessary to adjust the seesaw-like oscillation period in accordance with the material of the workpiece.

In the case of difficult-to-cut materials, the cutting amount is increased and the saw blade speed is reduced, so it is desirable that the seesaw-like rocking cycle of the band saw blade is longer. Conversely, in the case of easy-to-cut materials, Since the cutting is performed under the condition that the depth of cut is reduced and the saw blade speed is increased, it is desirable that the seesaw-like oscillation cycle be short. That is, it is desirable that the seesaw-like oscillation period of the band saw blade and the saw blade speed have an inversely proportional relationship.

Therefore, in the present invention, the seesaw-like rocking cycle of the band saw blade is linked to the saw blade speed so as to keep the cutting length at an appropriate cutting length,
By controlling the "depth of cut x cutting length" to be almost constant, the saw blade speed was increased and the cutting rate was increased to facilitate cutting.

FIG. 2 is a schematic front view showing a main part of a horizontal band saw machine necessary for explaining the present invention.

Although the outline of the horizontal band saw plate has already been described in FIG. 1,
The same members as those used in the description are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, a band saw blade 29 is endlessly wound and mounted between a drive wheel 21 and a driven wheel 23 provided on both left and right sides of a housing 47. Housing 47
A back roller cylinder 49 as a swing drive device for swinging the band saw blade 29 in the direction of cutting into the workpiece W like a seesaw is attached to the fixed guide arm 33 attached to the back roller cylinder 49. A piston rod 51 connected to the piston is extended downward, and is fixed to a support plate 55 that supports two backup rollers 53 at the tip of the piston rod 51 as a saw blade guide portion.

A spring 73 is interposed between the piston and the lower portion of the back roller cylinder 49, and the spring 73 is attached so as to be constantly urged upward. On the other hand, to the movable guide arm 35 attached to the housing 47, a back roller cylinder 75 as an oscillating drive device, which is exactly the same as the back roller cylinder 49, is attached similarly to the fixed guide arm 33.

A piston rod 77 connected to the piston of the back roller cylinder 75 extends downward, and the tip of the piston rod 77 has two backup rollers 79 as saw blade guides.
Is fixed to a support plate 81 supporting the.

A spring 83 is provided between the piston and the lower portion of the back roller cylinder 75, and the spring 83 is attached so as to be constantly urged upward. Then, the two backup rollers 53, 79 move up and down in the cutting direction by the vertical movement of the piston rods 51, 77 of the back roller cylinders 49, 75.

The vertical movement of the two backup rollers 53, 79 pushes or separates the band saw blade. Piston rod 51,7
When 7 moves downward, it moves against the urging force of springs 73 and 83, and when piston rods 51 and 77 move upwards, the urging force of springs 73 and 83 works to encourage return. .

A piston rod 87 connected to the piston of the lifting cylinder 85 extends upward, and a tip end portion of the piston rod 87 is attached to a lower right end portion of the housing 47. When the housing 47 descends, the piston rod 87 is pushed down.

The back roller cylinders 49, 75 and the lifting cylinder 85 as the swing drive devices are the back roller cylinders 49, 7
They are connected via a switching valve 65 as an operation control unit for controlling the operation of 5 and pilot operated check valves 89, 91. When the piston rod 87 of the lifting cylinder 85 moves downward due to the lowering of the bow 47, the pressure oil in the lifting cylinder 85 is changed over to the switching valve.
It is guided to the lower portion of the back roller cylinder 49 and the upper portion of the back roller cylinder 75 via the check valve 89 and the check valve 89.

As a result, the piston rod 51 of the back roller cylinder 49
Moves upward, the two backup rollers 53 are raised and separated by the band saw blade 29. On the other hand, when the piston rod 77 of the back roller cylinder 75 moves downward, the two backup rollers 79 are pushed down to push the band saw blade 29.

The reason for interposing the check valve 89 is to prevent the saw blade from being suddenly pushed down, and the pressure oil is made to flow when a certain set pressure is reached.

Switching of the switching valve 65 is performed by rotation of the cam 67. The cam 67 is provided with a drive wheel 21 for operating the switching operation of the switching valve 65 and the saw blade speed of the band saw blade 29 in association with each other.
Therefore, the descending cycle of the housing 47 is controlled in accordance with the saw blade speed of the band saw blade 29.

By switching the switching valve 65, the check valve 91
The pressure oil is guided to the upper part of the back roller cylinder 49 and the lower part of the back roller cylinder 75 through the action of the reverse action of the above action, and the two backup rollers 53 are pushed down to push the band saw blade 29. Shikatsu 2 backup rollers
79 rises and is separated from the band saw blade 29.

Therefore, the two pieces are attached to the fixed guide arm 33 and the movable guide arm 35 in correspondence with the saw blade speed of the band saw blade 29.
The individual backup rollers 53, 79 can be cut by alternately pressing in the cutting direction and separating from the cutting direction.

The operation will be described. When the housing 47 descends, the piston rod 87 of the lifting cylinder 85 moves downward. As the piston rod 87 moves downward, the pressure oil in the lifting cylinder 85 is transferred to the switching valve.
It is guided to the lower portion of the back roller cylinder 49 and the upper portion of the back roller cylinder 75 via the check valve 89 and the check valve 89.

As a result, the two backup rollers 53 attached to the fixed guide arm 33 rise and are separated by the band saw blade 29, while the two backup rollers 79 attached to the movable guide arm 35 push down the band saw blade 29. To do.

Therefore, the band saw blade 29 is in a state of being inclined to the upper right in FIG.

Next, when the switching valve 65 is switched by the rotation of the cam 67 connected to the drive wheel 21, it flows into the upper part of the back roller cylinder 49 and the lower part of the back roller cylinder 75 via the check valve 91, and the two valves are transferred. The backup roller 53 is pushed down and the band saw blade 29 is pushed. On the other hand, the two backup rollers 79 rise and are separated from the band saw blade 29.

Therefore, the band saw blade 29 is inclined to the upper left in FIG.

That is, the band saw blade 29 oscillates like a seesaw in a manner inclined to the upper right and an aspect inclined to the upper left, and the seesaw oscillating cycle is controlled in relation to the rotational speed of the drive wheel 21. It is what is done.

As described above, the seesaw-like swing cycle of the band saw blade 29 is controlled in relation to the drive wheel 21, so that the cutting amount of the band saw blade 29 with respect to the workpiece is increased and the saw blade speed is reduced to perform the cutting. When performed, the seesaw-like oscillation cycle of the band saw blade 29 is inversely proportional to the saw blade speed and becomes longer.

When the cutting amount of the band saw blade 29 with respect to the workpiece is reduced and the saw blade speed is increased to perform the cutting, the seesaw-like swing cycle of the band saw blade 29 is shortened due to the inversely proportional relationship with the saw blade speed. Is.

Therefore, if the saw blade speed is adjusted according to the material of the work piece, the band saw blade speed will be adjusted according to the adjusted saw blade speed.
The seesaw-like oscillation cycle of 29 is inevitably determined, and it is not necessary to adjust the seesaw-like oscillation cycle of the band saw blade 29 again according to the material of the workpiece.

In the above-described embodiment, the cam is used as a means for interlocking the swing cycle of the band saw blade with the saw blade speed. However, the present invention is not limited to this cam, and other detectors may be used, and the solenoid valve may be switched by an electric signal. Absent.

Although a horizontal band saw blade is used as the band saw blade in the above description, a vertical band saw blade (the work may be fixed to move the frame or vice versa) may be used.

(Effect) As will be understood from the above description of the embodiment, in short, the method of the present invention is applied to the workpiece W with the band saw blade 29.
And the band saw blade 29 swings like a seesaw in the direction of cutting into the workpiece W to perform cutting of the workpiece W. The seesaw-like swinging is performed so that the cycle thereof is inversely proportional to the saw blade speed of the band saw blade 29, and the product of the cutting amount and the cutting length of the band saw blade 29 with respect to the workpiece W is made substantially constant. It is a cutting control method for controlling.

Further, the cutting control device includes a band saw blade 29 that cuts into the workpiece W, a saw blade guide portion that guides the band saw blade 29 on both sides of the workpiece W, and a saw blade guide portion on both sides. As a cutting control device for a band saw machine, in which a rocking drive device for rocking the band saw blade 29 in the direction of cutting into the workpiece W like a seesaw by alternately moving in and out in the cutting direction is provided. In order to control the cutting amount, the cutting length, and the product of the band saw blade 29 with respect to the piece W to be substantially constant, the saw blade speed of the band saw blade 29 and the seesaw-like swing cycle of the band saw blade 29 are held in an inversely proportional relationship. In order to perform the related operation, the related control device for interlocking the operation control part of the swing drive device and the drive part of the band saw blade (29) is provided.

As is apparent from the above configuration, in the cutting control method of the present invention, the seesaw-like swing of the band saw blade 29 in the direction of cutting into the workpiece W has an inversely proportional relationship with the saw blade speed of the band saw blade 29. It is performed so as to hold it.
That is, the higher the saw blade speed of the band saw blade 29, the shorter the seesaw-like swing cycle of the band saw blade in the cutting direction.

Further, the cutting control device of the present invention, in order to carry out the above cutting control method, a saw blade speed of the band saw blade 29 and a swing drive device that performs seesaw-like swing in the cutting direction of the band saw blade, The saw blade speed and the seesaw-like oscillating cycle are provided with associated actuating devices for performing associated operations so as to maintain an inversely proportional relationship.

That is, according to the present invention, when the saw blade speed is increased when cutting the workpiece of the easy-to-cut material, the seesaw-like swing cycle in the cutting direction of the band saw blade to the workpiece becomes shorter, and If the saw blade speed is reduced when cutting a workpiece that is likely to be hardened, the seesaw-like rocking cycle of the band saw blade in the direction of cutting into the workpiece becomes longer.

Therefore, the cutting amount of the band saw blade with respect to the workpiece is controlled to the maximum cutting amount that the band saw blade can tolerate, and the cutting length is
When the cutting is performed while maintaining the proper cutting length corresponding to the maximum cutting amount, the seesaw-like swinging cycle of the band saw blade in the cutting direction operates in relation to the saw blade speed.

That is, when the cutting amount is increased and the saw blade speed is reduced to perform the cutting, the seesaw-like swing cycle of the band saw blade in the cutting direction becomes long. Therefore, when the band saw blade swings like a seesaw, the number of movements of the band saw blade in the direction in which the band saw blade relatively separates from the workpiece is reduced, and it is possible to maintain the seesaw swing cutting with a large depth of cut. It is a thing.

Conversely, when cutting a workpiece with a small depth of cut and a high saw blade speed, the seesaw-like oscillation cycle of the band saw blade becomes shorter and the band saw blade moves away from the workpiece relatively. Will be moved frequently,
Cutting is maintained with a small cutting depth.

Therefore, according to the present invention, it is possible to perform appropriate seesaw-like oscillating cutting according to the material without causing the cut amount to gradually decrease during seesaw-like oscillating cutting with a large depth of cut, for example. It is a thing.

Further, according to the present invention, when the saw blade speed is adjusted in accordance with the material of the workpiece, the seesaw-like swing cycle of the band saw blade is also adjusted in relation to the saw blade speed, and the operation is easy.

[Brief description of drawings]

FIG. 1 is a front view of a horizontal band saw machine showing an example of a band saw machine to which the present invention is applied. FIG. 2 is a schematic front view showing a main part of a horizontal band saw machine necessary for explaining the present invention. 1 …… Horizontal band saw machine 5 …… Cutting head 29 …… Band saw blade 47 …… Housing 65 …… Switching valve 67 …… Cam 49,75 …… Back roller cylinder

Claims (2)

[Claims] 1. A band saw blade (29) for a workpiece (W).
And the band saw blade (29) swings like a seesaw in the direction of cutting into the workpiece (W) to cut the workpiece (W). The seesaw-like swinging in the direction of cutting into (W) is performed so that its cycle maintains an inversely proportional relationship with the saw blade speed of the band saw blade (29), and the band saw blade ( 29) A cutting control method for a band saw, which is characterized by controlling the product of the depth of cut and the cutting length to be substantially constant. 2. A workpiece (W) comprising a band saw blade (29) for making a cut in the workpiece (W).
A saw blade guide portion for guiding the band saw blade (29) on both sides of the workpiece, and the saw blade guide portions on both sides alternately move in and out in the cutting direction to move the band saw blade (29) to the workpiece (W). A cutting control device for a band saw machine provided with a swing drive device for swinging in a seesaw direction in the direction of cutting into the cutting direction, the product of the cutting amount of the band saw blade (29) with respect to the workpiece (W) and the cutting length. In order to control the speed of the band saw blade (29) almost constant, the saw blade speed (29) and the seesaw-like rocking cycle of the band saw blade (29) are inversely proportional to each other, and the rocking drive is performed so as to perform related operations. Device operation control and band saw blade (2
A cutting control device for a band saw, which is provided with an associated actuating device for interlocking with the driving unit of 9).