JPS5828050B2 - Cutting device for shaped steel - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting device for shaped steel, and more specifically,
The present invention relates to a cutting device for shaped steel that sets a maximum depth of cut in accordance with the shape of the shaped steel and cutting conditions (single cut, bundle cutting) when cutting the shaped steel.

Traditionally, cut materials come in a wide variety of shapes and sizes.
It has been difficult to uniformly set these cutting conditions.

For this reason, the setting of the above-mentioned depth of cut depended on the operator's experience, but the degree of hollowness of section steel differs depending on the shape, so if the setting is incorrect, a large depth of cut will occur instantaneously at the time of cutting. As a result, an overload is applied to the cutting edge of the saw blade, which may cause the cutting edge to break.Also, since the saw blade is an elastic body, there is a risk that the saw blade may warp and break.

Furthermore, in the case of bundle cutting of steel sections with a large degree of hollowness, the cutting length changes repeatedly, and the direction of cutting changes, especially for thin square pipes, resulting in problems such as tooth chipping.

Furthermore, since lip steel and the like cannot be reliably clamped as a cutting group, there is a problem in that it springs up during cutting, and as a result, a large load is applied to the saw blade, shortening the life of the saw blade.

This invention was devised in view of such conventional problems, and its purpose is to improve the setting of the maximum depth of cut, which conventionally relied on the experience of operators, by The present invention provides a cutting device for shaped steel that uses a display board classified by the following criteria to set the optimal maximum cutting depth of the saw blade, significantly reduces damage to the saw blade, and improves cutting efficiency. be.

Another object of the present invention is to provide a cutting device for shaped steel that is extremely easy to install and remove, and that allows easy setting and reading of the depth of cut.

Hereinafter, a preferred embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a schematic diagram showing a pressure reducing valve device 1 of the present invention implemented in a hydraulic control circuit 5 of a horizontal band saw machine 3 of a hinge type.

Generally, a hinge type horizontal bandsaw machine 3 has a rectangular base 7.
At the top, a material support stand 9 for supporting the material M, and a vice mechanism 11 including a fixed vice jaw 11f and a movable vice jaw 11M for clamping and fixing the material M placed and supported on the material support stand 9 are attached. It is.

Further, on the base 7, a saw blade housing 13 having a hollow C shape is supported via a hinge pin 15 so as to be freely rotatable in the vertical direction.

A drive wheel 19 is rotatably installed inside one housing portion 17 of the saw blade housing 13 via a drive shaft 21, and a drive wheel 19 is installed inside the other housing portion 23 via a rotating shaft 25. A driven wheel 27 is rotatably installed inside.

A loop-shaped band saw blade 29 is wound around the drive wheel 19 and the driven wheel 27.

Note that in the saw blade housing 13, the housing portion 17
．． The guide member 33 provided on the beam member 31 that connects and supports the vicinity of the upper part of the band saw blade 23 has guide pieces 35 and 37 at its lower end for guiding and supporting the band saw blade 29 on both sides of the cutting area of the band saw blade 29. Arm members 39, 41 provided with
are installed so that their positions can be adjusted freely.

In the horizontal band saw machine 3 configured in this way, a rotation drive device (such as a motor) interlocked with the drive shaft 21 (
(not shown) rotates the drive wheel 19,
The drive wheel 19 and the driven wheel 27 drive the rotated band saw blade 29 for one movement to cut the material M.

In addition, in order to vertically rotate the saw blade housing 13 about the hinge pin 15 when cutting the material M, a piston rod 43 is installed at an appropriate position of the saw blade housing 13.
The lift cylinder 45 is operated by a lift cylinder 45 whose distal end is pivotally connected and whose base is pivotally supported by the base 7.

That is, by supplying pressure oil from the hydraulic pump 47 of the hydraulic control circuit 5 into the lift cylinder 45 and operating the piston rod 43 to project, the saw blade housing 13 is rotated upward.

After that, the oil passage 49 of the hydraulic control circuit 5 is switched, and the weight of the saw blade housing 13 causes the pressure oil in the lift cylinder 45 to be discharged via the pressure reducing valve device 1 and the cutting flow rate control valve 51. 13 is something that rotates downward.

As shown in FIG. 2, the pressure reducing valve device 1 includes a casing 55.
One end of the pressure reducing passage 57 provided in the lift cylinder 45
A second pressure reduction passage 59 is connected to the primary pressure passage 53a of the drain oil passage 53 and is branched from this pressure reduction passage 57.
is connected to a secondary pressure passage 53b that is connected to the flow rate control valve 51.

A spool 61 is slidably installed inside the decompression passage 57, and one end of this spool 61 is connected to the secondary pressure passage 5.
3 a and is supported by a casing cover 63 attached to one side wall of the casing 55 .

The other end of the spool 61 is in contact with a pressure adjustment member 67 in a pressure adjustment chamber 65 formed on the other side of the casing 55, and the opening of the pressure adjustment chamber 65 is connected to the casing cover 6.
It is hermetically closed by 9.

Further, a communication passage 71 is formed in the center of one end of the spool 61 and communicates with the secondary pressure passage 53a.
It is connected to 3.

The annular passage 73 communicates with the secondary pressure passage 53b via the primary pressure passage 53a and the second pressure reduction passage 59 when the spool 61 moves to the pressure adjustment chamber 65 side.

In addition, a recess 77 is formed at the center of the other end of the spool 61, in which a ball member 75 is rotatably housed. Become.

The pressure adjustment member 67 provided in the pressure adjustment chamber 65 includes a piston member 81 that slides along the inner wall of the pressure adjustment chamber 65 via a seal member 79, and this piston member 81.
A ball member 7 is connected to the spool 61 through an elastic member 83 such as a spring, and is provided at the center of the other end of the spool 61.
5 and a spring seat plate 85 that comes into elastic contact with the spring seat plate 85.

The piston member 81 has a rod portion 87 that is connected to the pressure adjustment chamber 6.
is screwed onto a casing cover 69 that closes the opening of 5;
Therefore, by rotating the rod portion 87, the piston member 81 slides.

By adjusting the position of the piston member 81, the elastic force of the elastic member 83 that presses the spool 61 can be adjusted.

Further, the pressure adjustment chamber 65 is configured to communicate with the second pressure reduction passage 59 via a communication passage 89 formed in the casing 55.

As a result, the lift cylinder 45 contracts, increasing the pressure in the primary pressure passage 53a, and this pressure increases to the spool 61.
When the elastic force becomes larger than the elastic force of the elastic member 83 that presses the
The spool 61 gradually protrudes into the pressure adjustment chamber 65 while contracting the elastic member 83.

When the annular passage 73 formed in the spool 61 communicates with the secondary pressure passage 53b via the second pressure reduction passage 59, the pressure oil in the primary pressure passage 53a flows out to the secondary pressure passage 53b. The pressure decreases, and a portion of this leaked pressure oil flows into the pressure adjustment chamber 65 through the communication path 89.

Then, when the combined force of the pressure of the pressure oil flowing into the pressure adjustment chamber 65 and the elastic force of the elastic member 83 becomes greater than the pressure in the secondary pressure passage 53a that presses the spool 61,
The spool 61 is again pressed toward the primary pressure passage 53a, and communication between the primary pressure passage 53a and the secondary pressure passage 53b is cut off.

Further, when the spool 61 is pressed toward the primary pressure passage 53a via the elastic member 83, the spool 61 and the elastic member 8
3 is the spring seat plate 85 and the spool 61.
The center of the spool 61 is always pressed, and even if there is a manufacturing error in the elastic member 83, the spool 61 is always pressed with a constant pressing force. It is something that can be done.

Next, the cutting flow rate control valve 51 provided in the secondary pressure passage 53b downstream of the pressure reducing valve device 1, which is the gist of the present invention, is a first
The optimal cutting speed of the cutting group X is controlled by the horizontal band saw machine 3 shown in the figure.

That is, the cutting depth of the cutting flow rate control valve 51 is determined by setting the feedback rate for the material of the material M to be cut (setting the pressure reduction amount of the pressure reducing valve device 1), as well as setting the maximum cutting value depending on the shape of the material M. This allows the maximum depth of cut to be lowered for a group of cuts where instantaneous changes in cutting length are repeated, such as a bundle of thin-walled rectangular pipes, etc.
The maximum depth of cut is set high for a material M whose cutting length changes relatively slowly, such as when cutting a single section of steel.

In this way, the cutting flow rate control valve 51 sets the optimum cutting speed according to the material of the cutting group made by bundling the materials M. However, the shapes and sizes of the materials vary widely. It is difficult to uniformly set cutting conditions due to the variety of conditions.

For this reason, a display board 95 is attached to the flow rate adjustment dial 91 of the cutting flow rate control valve 51, displaying a plurality of cutting groups 93a, 93b, 93c, 93d according to the material, shape, size, cutting length, etc. The flow rate adjustment dial 9
The range S15 S2 of the dial scale 97 provided in 1.

S3. By matching S4 with the desired cutting groups 933 to 93d, a desired cutting depth of cut speed can be obtained.

A plurality of cutting groups 93a to 93 displayed on the display board 95
As shown in FIGS. 3 and 4, d is divided based on the following grounds.

(1) Cutting group 93a The cutting group 93a has a cutting length of 10rnrI1 or more (wall thickness of approximately 1
0mm or more), which allows for relatively reliable clamping of the workpiece.

For example, materials that can be cut in one piece, such as H-shaped steel or square pipes.

(2) Cutting group 93b The cutting group 93b is a bundle cut with a cutting length of 107rL71 or more, has a good clamping condition, and has relatively little saw blade vibration.

For example, in bundle cutting of H-shaped steel, the cutting limit is reached by saw blade vibration and cutting bending, depending on the workpiece rigidity, the number of interrupted cutting points, and the saw blade support span.

(3) Cutting group 93c The cutting group 93c is a bundle cut with a cutting length of 6 degrees or more, which has a poor clamping condition and is prone to saw blade vibration.

For example, when performing bundle cutting of material M such as ■-shaped steel or mountain shape.

(4) Cutting group 93d Cutting group 93d is a bundle cut with a cutting length of 6 mm or less, the clamping condition is poor, deformation due to the cutting resistance of the material M itself may occur, and furthermore, the above (1,), (2), (3) ) that cannot be fully controlled using the depth of cut control method described above and require a fixed depth of cut speed.

As mentioned above, the reasons for dividing the cutting results into four categories based on the cutting results of various materials are the optimum cutting speed limit when the material M is rigid, the rigidity, clamping condition, and the large number of cutting parts. This is because the cutting speed is affected by cutting limits due to vibration, cutting bending, etc.

Next, when controlling the cutting depth using the cutting flow rate control valve 51 as described above, first the back force (on the bandsaw blade 29
In the graph explanatory diagram showing the relationship between cutting reaction force in the vertical direction) and cutting speed, the characteristic diagram of the control circuit X1
and cutting resistance characteristic diagram Y.

Find the cutting speed from the intersection with

The characteristic diagram X1 of the control circuit is determined by the differential pressure of the pressure reducing valve device 1, the valve opening of the cutting flow rate control valve 51, and the distance from the hinge pin 15 to the cutting part in FIG. ¥1 is determined by the cutting length, the material of the material M, the distance from the hinge pin 15 to the cutting part, the saw speed, and the band saw blade 29.

As is clear from this graph explanatory diagram, the maximum thrust force is
The larger the pressure reducing valve differential pressure is, the larger the cutting speed becomes, and the larger the opening degree of the cutting flow rate control valve 51 is, the larger the maximum cutting speed becomes.

After the cutting speed is determined in this manner, the cutting speed displayed on the dial scale 97 is made to correspond to the desired cutting groups 93a to 93d.

In addition, Fig. 6 is a graph explanatory diagram showing the relationship between cutting rate and cutting length when thrust force is used as a parameter based on an experiment, and the majority of the materials of the section steel are SS material and SM material. .

In the practical cutting range, the cutting rate when the same thrust force is used is a cutting length of 100 mm, and below that, the cutting rate increases rapidly, and becomes an almost constant value between 100 mm and above.

Most of the cutting lengths of the target steel sections are 150 mm or less, and especially when the cutting length is 100 mm or less, the cutting rate must be gradually lowered as the cutting length becomes smaller than the cutting limit. It can be understood that this characteristic diagram corresponds to the control characteristics of the embodiment of the present invention.

In the above embodiment, the hinge-type horizontal bandsaw machine 3 in which the saw blade housing 13 swings about the hinge pin 15 has been described. Of course, this can also be done for horizontal band saws.

Further, the present invention is not limited to the above-mentioned embodiments, and may be implemented in other embodiments.

As mentioned above, the cutting groups 93a to 93 are divided and displayed according to the material, shape, size, cutting length, etc. of the cutting material.
Since the display plate 95 of d is attached to the flow rate adjustment dial 91 of the cut flow rate control valve 51 and taken over, the following excellent effects are achieved.

■ Anyone can easily and accurately set the maximum cutting depth of the saw blade without relying on the operator's experience.

■ Also, since the maximum depth of cut for the cutting material can be set within the optimal range, a large load is not applied to the saw blade during cutting, and problems such as damage to the saw blade do not occur, extending the life of the band saw blade. be able to.

(2) Moreover, for the reason (2) above, the cutting efficiency can be improved, and furthermore, the setting work can be performed extremely easily.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a pressure reducing valve device of the present invention implemented in a hydraulic control circuit of a horizontal bandsaw machine, Fig. 2 is an enlarged vertical sectional view of the pressure reducing valve device, and Figs. 3 and 4 are cutting flow rates. An explanatory diagram of the cutting group display board attached to the control valve, Fig. 5 is a graph explanatory diagram showing the relationship between back force and cutting speed, and Fig. 6 shows the cutting rate and cutting rate when the back force is used as a parameter. It is a graph explanatory diagram showing the relationship with cutting length. Explanation of main symbols shown in the drawings, 3...
Horizontal band saw machine, 45... Lift cylinder, 51.
... Cutting flow control valve, 91 ... Flow rate adjustment dial, 93a to 93d ... Cutting group, 95
...Display board.

Claims (1)

[Claims] 1. A cutting flow rate control valve 51 that controls the cutting speed of the horizontal bandsaw machine 3 is provided in a working fluid supply/discharge path connected to the lift cylinder 45 that raises and lowers the horizontal bandsaw machine 3, and the flow rate of this cutting flow rate control valve 51 is provided. Adjustment dial 91, cutting group 9
3a to 93d. A cutting device for shaped steel characterized by being provided with a display board 95 displaying cutting speeds corresponding to the materials, shapes, and sizes of 3a to 93d.