JP2021171782A - Workpiece support of thermal processing machine - Google Patents

Abstract

To provide a workpiece support of a thermal processing machine, which is excellent in durability and which can secure a release space for assist gas generated during thermal processing, while preventing deposition to a workpiece to be processed.SOLUTION: A workpiece support of a thermal processing machine, which is formed in a horizontally long shape from a plate-like member made of carbon fibers and the upside of which is formed in a continuous wave shape, is installed on a workpiece support table so as to support a workpiece to be thermally processed. In the workpiece support, the wave height h of the wave shape can also be set lower than a specified value, and a tip curvature radius r can also be set larger than a specified value.SELECTED DRAWING: Figure 2

Description

The present invention relates to a work support of a heat processing machine.

Conventionally, a work support table of a heat processing machine such as a laser processing machine or a plasma processing machine has a plurality of plate-shaped work supports (work) as a support member for supporting the sheet metal (work) to be processed from the lower surface. Support members) are provided. The plurality of work supports are arranged side by side at predetermined intervals on the work support table with the plate surface 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 allow the assist gas generated during thermal processing to escape. Can be secured.

Japanese Unexamined Patent Publication No. 2001-314998

As described above, even if the work supports are arranged at intervals, if a linear thermal process that matches the upper side of any of the work supports is performed, the work and the work support are welded together. However, it is not possible to secure an escape place for the assist gas, which may cause a problem in processing.

In view of this, some work supports have continuous triangular protrusions formed on the upper side. When the work supports formed in this way are arranged on the work support table and the work to be machined is placed on the work, the protrusions at the upper end of each work support come into contact with the lower surface of the work, and the work is point-supported. NS. Since the work is point-supported, welding between the work and the work support due to thermal processing can be accurately suppressed, and an escape place for the assist gas can be reliably secured.

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

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

The present invention is characterized in that it is installed on a work support table to support a work to be heat-processed, is formed into a horizontally long shape by a plate-like member of carbon fiber, and is formed into a continuous wavy shape on the upper side. Provide a work support.

According to the present invention, it is possible to provide a work support of a heat processing machine which has excellent durability and can secure an escape place for assist gas generated during heat processing while preventing welding with a work to be processed. ..

It is an external perspective view which shows the laser processing machine which uses the work support of the heat processing machine in one Embodiment. It is a front view of the work support 30 in one Embodiment. It is an enlarged view of the upper part of the work support 30 in one embodiment. (A) to (e) are front views of the work supports 30a to 30e in one embodiment.

Hereinafter, a laser processing machine, which is a heat 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 attached drawings.

The laser processing machine 1 according to the present embodiment performs cutting processing, and as shown in FIG. 1, a work support table 3 for installing a work W to be heat-processed is provided on the apparatus base 2. There is. On the work support table 3, a plurality of work supports 30 that support the work W to be machined are arranged in the X direction. The material and shape of each work support 30 will be described later.

The laser machine 1 includes a gate-shaped frame 4 arranged so as to straddle the 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 that emits a laser is attached to the carriage 5. The frame 4 moves in the X direction by a dedicated drive system (not shown), and the carriage 5 moves in the Y direction by a dedicated drive system (not shown), so that the laser head 51 moves in the Y direction of the work W. 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 the 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 a 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.

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

The melting point of carbon fiber is 3550 ° C., which is much higher than the melting point of 1580 ° C. of a general metal work W. Further, the possibility that the carbon fiber is immediately alloyed with the metal or the metal with the composition change is fixed is extremely low as compared with the conventional iron-based work support. Therefore, by using carbon fiber as the material of the work support 30, it is possible to prevent welding of the work W and the work support 30 due to irradiation of the laser beam when the work W is cut. Further, since the spatter scattered by the cutting process hardly welds to the work support 30, it becomes difficult to deposit, and even if it does, it easily peels off and the removal work becomes easy. Further, since the C / C composite material is reinforced by impregnating the woven carbon fibers with various substances, elasticity is generated by forming the C / C composite material into a thin plate shape.

The shape of the work support 30 will be described with reference to FIG. The work support 30 is a horizontally long plate-shaped member, and its upper side is formed in a continuous wave shape with a waveform 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 it is possible to secure an escape place for the assist gas generated during thermal processing. Further, the spatter scattered during the thermal processing is discharged from this gap, and the rebound of the spatter to the work W can be reduced. Even if the work support is made of carbon fiber, if the area in contact with the work is large, it will not be possible to secure an escape place for the assist gas. The part where the carbon fiber is lost by the laser beam becomes sharper, which increases the risk of the field worker. The waveform is the result of considering the above-mentioned merits and demerits.

Further, in the waveform q on the upper side of the work support 30, the interval (pitch) p between the vertices of the waveform q is wide, in which the wave height h is set to a value lower than a predetermined value and the tip curvature radius r is set to a value larger than a predetermined value. It is formed by a gentle curve. The waveform q will be described in detail with reference to FIG.

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

At this time, the straight line extending linearly from the connection point e3 between the valley bottom curve e3-e4 and the inclined line e2-e3 connected to the valley bottom curve e3-e4 and tangent to the peak curve adjacent to the valley bottom curve e3-e4 is defined as the tangent line g. .. Further, the line obtained by extending the inclined line e2-e3 is referred to as an extension line i. Here, the wave height h of the waveform q and the radius of curvature r at the tip of each peak curve and valley bottom curve are set so that the angle θ1 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 radius of curvature r of the waveform q in this way, the upper side of the work support 30 is formed into a gentle wave shape, and the gap between the work W and the work support 30 is formed wide. This facilitates the removal of spatter accumulated on the work support 30, and prevents clogging of the upper part of the work support 30 due to spatter. Further, by increasing the radius of curvature r at the tip of the waveform q, the buckling strength of the upper part of the work support 30 can be increased.

Further, by increasing the radius of curvature r at the tip of the waveform q, the pitch p of the waveform q becomes wider. When the pitch p becomes wide, small items such as fragments of the work W fall to the upper part, the first end portion which is one end thereof fits into the valley portion of the waveform q, and the second end portion which is the other end is the peak peak of the waveform q. It is possible to suppress the height from the top of the mountain to the second end (hereinafter, referred to as "rise height") when standing above. This makes it possible to prevent the dropped small items from interfering with the laser head 51.

The rising height of the small items that have fallen on the work support 30 will be described. When an accessory falls on the work support 30 having the above-mentioned shape, if the dimension of the accessory is shorter than a predetermined range, the entire accessory falls into the valley of the waveform q and no rising portion is generated. Further, if the size of the accessory is longer than the predetermined range, the accessory rotates around the contact point f as a fulcrum, and the rising height becomes low 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 accessory is within a predetermined range, the first end thereof fits into the valley portion of the waveform q, the central portion touches the mountaintop curve adjacent to the valley portion, and the second end portion has a waveform. It is in a state of standing above the path line L connecting the peaks of q. In particular, when it falls at a position overlapping the tangent line g and its first end fits into the connection point e3 which is the upper end of the valley bottom curve e3-e4, the rising height of the second end becomes the highest.

Here, a circle j is drawn with the contact point f as the center and the tangent line g (contact point f-connection point e3) as the radius, and the point where the extension line k of the tangent line g and the circle j intersect is defined as the intersection point m. When an accessory of a predetermined length falls at a position where it overlaps with the tangent line g and the extension line k, the first end portion thereof fits into the connection point e3, and the intermediate portion contacts the contact point f and stands still, the maximum value of the dimension of the accessory is , The length from the connection point e3, which is the diameter of the circle j, to the intersection m. The rising height s of the second end of the small item when the small item having the maximum dimension falls at a position overlapping the tangent line g and the extension line k is the maximum value of the rising height of the small item in the work support 30. Become. When the shape of the second end portion of the accessory is configured to have portions having different heights, the rising height s of the accessory is the highest point in the second end portion.

As a result, the waveform q on the upper part of the work support 30 is placed on the work support 30 by changing the wave height h and the tip curvature radius r of the peak curve and the valley bottom curve while maintaining the state where the angle θ1 is 90 ° or more. The rising height s of the second end portion when a small object is dropped can be adjusted within a desired range. The range of the rising height s of the second end of the accessory is set to a value smaller than, for example, the wave height h.

Further, when changing the tip curvature radius r, a straight line drawn from the apex f of the peak curve e1-e2 perpendicular to the floor surface is defined as a straight line n, and the peak curve e1-e2 formed by the straight line n and the extension line i. The value of the notch tip angle θ2 of the above may be adjusted as appropriate.

As a specific example of the work support 30 configured as described above, the work supports 30a to 30e shown in FIGS. 4A to 4E will be described.

The work support 30a shown in FIG. 4A has a horizontally long shape of 375 mm in width and 50 mm in length, and the upper side is formed in a wavy shape with a 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 notch tip angle of the summit curve of 59 °. In the work support 30a, the maximum dimension of the accessory u1 in which a rising portion is generated when dropped is 50.3 mm. When a small item u1 of this size falls and one end of the small item u1 fits in the valley of the waveform q1, the angle between the small item u1 and the pass line L is 20 °, and the rising height s1 of the small item u1 is 7.7 mm. become. That is, the maximum value of the rising height of the accessory u1 on the work support 30a is 7.7 mm.

The work support 30b shown in FIG. 4B has a horizontally long shape having the same size as the work support 30a, and the upper side is formed in a wavy shape with a 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 notch tip angle of the summit curve of 64 °. In this work support 30b, the maximum dimension of the accessory u2 in which a rising portion is generated when dropped is 32.2 mm. When a small item u2 of this size falls and one end of the small item u2 fits in the valley of the waveform q2, the angle between the small item u2 and the pass line L is 15 °, and the rising height s2 of the small item u2 is 3.8 mm. become. That is, the maximum value of the rising height of the accessory u2 on the work support 30b is 3.8 mm.

The work support 30c shown in FIG. 4C has a horizontally long shape having the same size as the work support 30a, and the 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 notch tip angle of the summit curve of 72 °. In this work support 30c, the maximum dimension of the accessory u3 in which a rising portion is generated when dropped is 48.8 mm. When a small item u3 of this size falls and one end of the small item u3 fits in the valley of the waveform q3, the angle between the small item u3 and the pass line L is 10 °, and the rising height s3 of the small item u3 is 3.8 mm. become. That is, the maximum value of the rising height of the accessory u3 on the work support 30c is 3.8 mm.

The work support 30d shown in FIG. 4D has a horizontally long shape having the same size as the work support 30a, and the 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 of h4 of 2 mm, a tip curvature radius of r4 of 3 mm, and a notch tip angle of the summit curve of 59 °. In this work support 30d, the maximum dimension of the accessory u4 in which a rising portion is generated when dropped is 10.1 mm. When a small item u4 of this size falls and one end of the small item u4 fits in the valley of the waveform q4, the angle between the small item u4 and the pass line L is 20 °, and the rising height s4 of the small item u4 is 1.5 mm. become. That is, the maximum value of the rising height of the accessory u4 on the work support 30d is 1.5 mm.

The work support 30e shown in FIG. 4E has a horizontally long shape having the same size as the work support 30a, and the upper side is formed in a wavy shape with a waveform q5. The waveform q5 has a pitch p5 of 30 mm, a wave height of h5 of 2 mm, a tip curvature radius of r5 of 20 mm, and a notch tip angle of the summit curve of 80 °. In this work support 30e, the maximum dimension of the accessory u5 in which a rising portion is generated when dropped is 25.8 mm. When a small item u5 of this size falls and one end of the small item u5 fits into the valley of the waveform q5, the angle between the small item u5 and the pass line L is 8 °, and the rising height s5 of the small item u5 is 1.6 mm. become. That is, the maximum value of the rising height of the accessory u5 on the work support 30e is 1.6 mm.

By changing the wave-shaped waveform on the upper side of the work support 30 in this way, small items fall on 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. The maximum value of the rising height can be adjusted as appropriate.

Since the upper part of the work support configured as described above is formed in a wavy shape with a large tip radius of curvature and a gentle waveform, it has excellent durability and is generated during thermal machining while preventing welding with the workpiece to be machined. It is possible to secure an escape place for the assist gas.

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

1 Laser Machining Machine 2 Equipment Base 3 Work Support Table 4 Frame 5 Carvature 6 NC Equipment 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 radius of curvature

Claims (3)

Installed on the work support table to support the work to be heat-processed
A work support of a heat processing machine characterized in that it is formed in a horizontally long shape by a plate-shaped member of carbon fiber and the upper side is formed in a continuous wavy shape. The wave shape is formed by connecting the peak curve and the valley bottom curve with a straight slope line, and is linearly extended from the connection point between the predetermined valley bottom curve and the slope line connected to the predetermined valley bottom curve. The wave height and tip curvature radius of the wave shape are set so that the angle between the tangent line tangent at the predetermined contact point of the mountaintop curve adjacent to the valley bottom curve and the inclined line connected to the predetermined valley bottom curve is 90 ° or more. The work support of the heat processing machine according to claim 1, wherein the work support is made. The wavy shape is such that when an accessory falls on the upper part, the first end of the accessory fits into the valley of the waveform, and the second end rises above the peak of the waveform, the peak The work support of the heat processing machine according to claim 1 or 2, wherein the height from the second end to the highest point is set to be smaller than the wave height.

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