JP7308170B2 - Work support for thermal processing machine - Google Patents

Description

The present invention relates to a work support for a thermal processing machine.

Conventionally, the work support table of a thermal processing machine such as a laser processing machine or a plasma processing machine has a plurality of plate-shaped work supports (workpieces) as support members that support the sheet metal (work) to be processed from the bottom surface. support members) are provided. The plurality of work supports are arranged side by side at predetermined intervals on the work support table with their plate surfaces perpendicular to the floor surface.

By arranging the work supports at intervals, it is possible to suppress welding between the work and the work support due to thermal processing, and a gap is formed between them to escape the assist gas generated during thermal processing. can be ensured.

Japanese Unexamined Patent Application Publication No. 2001-314998

As described above, even if the work supports are arranged with a space therebetween, if the linear thermal processing that matches the upper side of any work support is performed, welding between the work and the work support does not occur. cannot be avoided, and the escape of the assist gas cannot be ensured, which may cause problems in processing.

In view of this, there is a work support in which continuous triangular projections are formed on the upper side of the work support. When the work supports thus formed are arranged on a work support table and a work to be machined is placed thereon, the protrusions on the upper end of each work support come into contact with the lower surface of the work, thereby point-supporting the work. be. By point-supporting the work, welding between the work and the work support due to thermal processing can be prevented with high precision, and an escape for the assist gas can be ensured.

However, the triangular projection formed on the upper side of the work support has a problem that the tip thereof is easily damaged by thermal processing, resulting in poor durability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work support for a heat processing machine which is excellent in durability and which can secure an escape for assist gas generated during heat processing while preventing welding with the work to be processed. .

The present invention is set on a work support table for supporting a work to be thermally processed, is formed of a carbon fiber plate-like member in a horizontally long shape, and has an upper side formed in a continuous wave shape, and the wave shape is a continuous structure in which a peak curve and a valley bottom curve are connected by a straight slope line, and is linearly extended from a connecting point of a predetermined valley bottom curve and a slope line connected thereto to the valley bottom curve. The wave height and tip curvature radius of the wave shape are set so that the angle formed by a tangent line that contacts the adjacent peak curve at a predetermined point of contact and the slope line connected to the predetermined valley bottom curve is 90° or more. To provide a work support for a thermal processing machine characterized by:
Further, according to the present invention, there is provided a work support table which is placed on a work support table for supporting a work to be thermally processed, is formed of a carbon fiber plate-shaped member in a horizontally long shape, and has a continuous wave shape on the upper side. The shape is such that when a small object falls to the top, the first end of the small object fits in the trough portion of the waveform, and the second end rises above the crest point of the waveform, the Provided is a work support for a thermal processing machine , characterized in that the height to the highest point of the second end is set to be smaller than the wave height.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a work support for a thermal processing machine which is excellent in durability and which is capable of securing an escape for assist gas generated during thermal processing while preventing welding with a work to be processed. .

1 is an external perspective view showing a laser processing machine using a work support of a thermal processing machine in one embodiment; FIG. 1 is a front view of a work support 30 in one embodiment; FIG. 3 is an enlarged view of the top of work support 30 in one embodiment. FIG. (a)-(e) are front views of work supports 30a-30e in one embodiment.

Hereinafter, a laser processing machine, which is a thermal processing machine, using a work support table on which a work support according to one embodiment is installed will be described with reference to the accompanying drawings.

A laser processing machine 1 according to the present embodiment performs cutting processing, and as shown in FIG. there is A plurality of work supports 30 for supporting the work W to be processed are arranged in the X direction on the work support table 3 . The material and shape of each work support 30 will be described later.

A laser processing machine 1 includes a gate-shaped frame 4 arranged to straddle a work support table 3 . The frame 4 has side frames 41 and 42 and an upper frame 43 .

A carriage 5 movable in the Y direction is provided in the upper frame 43 . A laser head 51 for emitting a laser is attached to the carriage 5 . The frame 4 is moved in the X direction by a dedicated drive system (not shown), and the carriage 5 is moved in the Y direction by a dedicated drive system (not shown). Above, it is configured to move arbitrarily in the X and Y directions.

An NC device 6 for controlling the laser processing machine 1 is attached to the frame 4 . The NC device 6 controls the laser processing machine 1 according to processing data (NC data) for processing the work W. The NC device 6 is a control device that controls the laser processing machine 1 .

The work W is cut by irradiating the work W with laser while the laser head 51 is moved in the X direction or the Y direction by the frame 4 and the carriage 5 under the control of the NC device 6 .

A work support 30 installed on the work support table 3 will be described. Each work support 30 is formed by cutting out a thin plate in which a string-like carbon fiber, for example, a carbon fiber reinforced carbon composite material (C/C composite material) is plain woven, into a long shape. Plain weave is a weaving method in which fibers are crossed vertically and horizontally one by one.

The carbon fiber has a melting point of 3550°C, which is much higher than the 1580°C melting point of a general metal workpiece W. In addition, carbon fibers are less likely to be alloyed with metals immediately or adhere to metals with changes in composition, as compared to conventional iron-based work supports. Therefore, by using carbon fiber as the material of the work support 30, it is possible to prevent welding between the work W and the work support 30 due to irradiation of the laser beam when the work W is cut. In addition, since the spatter scattered during the cutting process hardly adheres to the work support 30, it is difficult to deposit. In addition, since the C/C composite material is fiber reinforced by impregnating the woven carbon fibers with various substances, elasticity is generated by forming the material into a thin plate.

The shape of the work support 30 will be described with reference to FIG. The work support 30 is a horizontally long plate-like member, and the upper side thereof is formed in a continuous wave shape by the wave q. By forming the upper side of the work support 30 in such a wavy shape, a gap is formed between the work W and the work support 30, and an escape space for the assist gas generated during thermal processing can be secured. Moreover, the spatter scattered during the thermal processing is discharged from this gap, and the rebounding of the spatter to the workpiece W can be reduced. Even if the work support is made of carbon fiber, if the area in contact with the work is large, the escape of the assist gas cannot be secured. The portion where the carbon fiber has disappeared due to the laser beam becomes sharper, increasing the danger to the field worker. The waveform is the result of considering the merits and demerits described above.

Also, the waveform q on the upper side of the work support 30 has a wave height h lower than a predetermined value and a tip curvature radius r larger than a predetermined value. Formed by a gentle curve. Waveform q will be described in detail with reference to FIG.

FIG. 3 is an enlarged view of part of the upper side of the work support 30. As shown in FIG. The waveform q on the upper side of the work support 30 has a peak curve e1-e2 with a tip curvature radius r and a valley bottom curve e3-e4 connected by a straight inclined line e2-e3. The curve e5-e6 is connected by an inclined line e4-e5, the peak curve e5-e6 and the valley bottom curve e7-e8 are connected by an inclined line e6-e7, and these are continuously connected to form a pitch p and a wave height h. is formed by

At this time, the straight line extending straight from the connecting point e3 of the valley bottom curve e3-e4 and the slope line e2-e3 connected thereto and contacting the crest curve adjacent to the valley bottom curve e3-e4 is defined as the tangent line g. . A line obtained by extending the inclined line e2-e3 is assumed to be an extension line i. Here, the wave height h of the waveform q and the tip curvature radius r of each peak curve and valley bottom curve are set so that the angle θ on the peak side of the waveform q formed by the tangent line g and the extension line i is 90° or more. do.

By setting the wave height h and the tip curvature radius r of the waveform q in this manner, the upper side of the work support 30 is formed in a gentle wave shape, and the gap between the work W and the work support 30 is widened. This makes it easier to remove the spatter deposited on the work support 30 and prevents clogging of the upper part of the work support 30 due to the spatter. Further, by increasing the tip curvature radius r of the waveform q, the buckling strength of the upper portion of the work support 30 can be increased.

Also, by increasing the tip curvature radius r of the waveform q, the pitch p of the waveform q becomes wider. When the pitch p is widened, a small object such as a fragment of the work W falls to the top, the first end of which falls into the trough of the waveform q, and the second end of the small object falls into the trough of the waveform q. , the height from the summit point to the second end (hereinafter referred to as "rising height") can be reduced. As a result, it is possible to prevent a dropped small article from interfering with the laser head 51 .

The rising height of the small article dropped on the work support 30 will be described. When a small object falls onto the work support 30 having the shape described above, if the size of the small object is shorter than a predetermined range, the entire small object falls into the valley of the waveform q and no rising portion occurs. Also, if the dimension of the small article is longer than the predetermined range, the small article rotates about the contact f as a fulcrum, and the height of the small article is lowered, or becomes parallel to the floor surface and does not rise above the work support 30. .

On the other hand, if the size of the small article is within a predetermined range, the first end fits in the valley of the waveform q, the center touches the crest curve adjacent to the valley, and the second end is in the waveform. It stands above the path line L connecting the peak points of q. In particular, when it falls to a position overlapping the tangent line g and the first end fits the connection point e3, which is the upper end of the valley curve e3-e4, the rising height of the second end becomes the highest.

Here, draw a circle j with the contact point f as the center and the tangent line g (the contact point f-connection point e3) as the radius. When a small object of a predetermined length falls to a position where it overlaps the tangent line g and the extension line k, and its first end fits into the connection point e3, and the middle portion comes to rest with the contact point f, the maximum value of the size of the small object is , the length from the connection point e3, which is the diameter of the circle j, to the intersection point m. The height s of the second end of the small article when the small article having the maximum size falls to the position overlapping the tangent line g and the extension line k is the maximum rise height of the small article on the work support 30. Become. When the shape of the second end of the small article is configured to have portions with different heights, the rising height s of the small article is the highest point within the second end.

As a result, while the angle θ1 of the waveform q on the upper part of the work support 30 is maintained at 90° or more, the wave height h and the tip curvature radius r of the crest curve and the valley bottom curve are changed, thereby making the waveform q on the work support 30 The rising height s of the second end when a small article falls can be adjusted within a desired range. The range of the rising height s of the second end of the small article is set to a value smaller than the wave height h, for example.

When changing the tip curvature radius r, a straight line drawn perpendicular to the floor surface from the vertex f of the peak curve e1-e2 is defined as a straight line n. The value of the cutting edge angle θ2 may be adjusted as appropriate.

As specific examples of the work support 30 configured as described above, work supports 30a to 30e shown in FIGS. 4(a) to 4(e) will be described.

The work support 30a shown in FIG. 4A has a horizontally long shape of 375 mm wide and 50 mm long, and the upper side is formed in a wave shape with the waveform q1. The waveform q1 has a pitch p1 of 50 mm, a wave height h1 of 10 mm, a tip curvature radius r1 of 15 mm, and a tip angle of the crest curve of 59°. In this work support 30a, the maximum size of a small article u1 that has a raised portion when dropped is 50.3 mm. When a small object u1 of this size falls and one end of it fits into the valley of the waveform q1, the angle formed by the small object u1 and the pass line L is 20°, and the rising height s1 of the small object u1 is 7.7 mm. become. That is, the maximum height of the small article u1 on the work support 30a is 7.7 mm.

The work support 30b shown in FIG. 4(b) has a horizontally long shape with the same size as the work support 30a, and the upper side is formed in a wavy shape with the waveform q2. The waveform q2 has a pitch p2 of 30 mm, a wave height h2 of 5 mm, a tip curvature radius r2 of 10 mm, and a crest curve tip angle of 64°. In this work support 30b, the maximum size of a small object u2 that causes a rising portion when dropped is 32.2 mm. When a small object u2 of this size falls and one end of it fits into the valley of the waveform q2, the angle formed by the small object u2 and the pass line L is 15°, and the rising height s2 of the small object u2 is 3.8 mm. become. That is, the maximum height of the small object u2 on the work support 30b is 3.8 mm.

A work support 30c shown in FIG. 4(c) has a horizontally long shape of the same size as the work support 30a, and its upper side is formed in a wavy shape with a waveform q3. The waveform q3 has a pitch p3 of 50 mm, a wave height h3 of 5 mm, a tip curvature radius r3 of 30 mm, and a peak curve tip angle of cut of 72°. In this work support 30c, the maximum size of the small article u3 that causes a rising portion when dropped is 48.8 mm. When a small object u3 of this size falls and one end of it fits into the valley of the waveform q3, the angle formed by the small object u3 and the pass line L is 10°, and the rising height s3 of the small object u3 is 3.8 mm. become. That is, the maximum height of the small article u3 on the work support 30c is 3.8 mm.

A work support 30d shown in FIG. 4(d) has a horizontally long shape with the same size as the work support 30a, and its upper side is formed in a wavy shape with a waveform q4. The waveform q4 has a pitch p4 of 10 mm, a wave height h4 of 2 mm, a tip curvature radius r4 of 3 mm, and a tip angle of the tip of the crest curve of 59°. In this work support 30d, the maximum size of a small article u4 that causes a rising portion when dropped is 10.1 mm. When a small object u4 of this size falls and one end of it fits into the valley of the waveform q4, the angle formed by the small object u4 and the pass line L is 20°, and the rising height s4 of the small object u4 is 1.5 mm. become. That is, the maximum height of the small article u4 on the work support 30d is 1.5 mm.

The work support 30e shown in FIG. 4(e) has a horizontally long shape with the same size as the work support 30a, and the upper side is formed in a wavy shape with the waveform q5. The waveform q5 has a pitch p5 of 30 mm, a wave height h5 of 2 mm, a tip curvature radius r5 of 20 mm, and a tip angle of the crest curve of 80°. In this work support 30e, the maximum size of the small article u5 that causes a rising portion when dropped is 25.8 mm. When a small object u5 of this size falls and one end of it fits into the valley of the waveform q5, the angle formed by the small object u5 and the pass line L is 8°, and the rising height s5 of the small object u5 is 1.6 mm. become. That is, the maximum height of the small article u5 on the work support 30e is 1.6 mm.

In this way, by changing the wavy shape of the upper side of the work support 30, a small object falls onto the work support 30 according to the distance from the upper end of the work support 30 to the laser head 51 and the like. It is possible to appropriately adjust the maximum value of the rising height when the

Since the upper part of the work support configured as described above is formed in a gently wavy wave shape with a large radius of curvature at the tip, it is excellent in durability and prevents welding with the work to be processed. It is possible to secure an escape place for the assist gas to be used.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

1 laser processing machine 2 device base 3 work support table 4 frame 5 carriage 6 NC device 30, 30a, 30b, 30c, 30d, 30e work support 41, 42 side frame 43 upper frame 51 laser head h wave height p waveform Pitch q Waveform r Tip curvature radius

Claims (2)

Installed on the work support table to support the work to be thermally processed,
It is formed in a horizontally long shape with a carbon fiber plate-shaped member, and the upper side is formed in a continuous wave shape,
The wavy shape is continuously formed by connecting a crest curve and a trough curve with a straight slant line, and is linearly extended from a connection point between a predetermined trough curve and a slant line connected thereto. The wave height and tip radius of curvature of the wave shape are set so that an angle between a tangent line that contacts a peak curve adjacent to a valley bottom curve at a predetermined point of contact and an inclined line connected to the predetermined valley bottom curve is 90° or more. be done
A work support for a thermal processing machine, characterized by: Installed on the work support table to support the work to be thermally processed,
It is formed in a horizontally long shape with a carbon fiber plate-shaped member, and the upper side is formed in a continuous wave shape,
When a small object falls on the upper part of the waveform, the first end of the small object fits in the valley of the waveform, and the second end rises above the crest point of the waveform, the crest point to the highest point of the second end is set to be smaller than the wave height
A work support for a thermal processing machine , characterized by :

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