CN111922539A - Honeycomb bottom plate suitable for laser cutting machine - Google Patents

Honeycomb bottom plate suitable for laser cutting machine Download PDF

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CN111922539A
CN111922539A CN202010798444.XA CN202010798444A CN111922539A CN 111922539 A CN111922539 A CN 111922539A CN 202010798444 A CN202010798444 A CN 202010798444A CN 111922539 A CN111922539 A CN 111922539A
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honeycomb
bottom plate
laser cutting
cutting machine
face
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CN111922539B (en
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杨振威
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Suzhou Chanxan Laser Technology Co ltd
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Suzhou Chanxan Laser Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention provides a honeycomb bottom plate suitable for a laser cutting machine, which consists of a plurality of bottom plate unit cells, wherein each bottom plate unit cell is formed by connecting and closing a certain amount of grid walls end to end, and adjacent bottom plate unit cells share one grid wall; the grid wall has a first end and a second end in a vertical direction; the first end part is a horizontal end surface connected with the cutting platform; the second end portion is close to the laser cutting device and comprises a first end face, a second end face and a third end face which are sequentially connected, wherein: the first end surface and the third end surface are inclined, symmetrically arranged at two sides of the second end surface and respectively form included angles A and A' with the upper surface of the honeycomb bottom plate. The invention improves the structure of the honeycomb base plate in a targeted manner, provides enough supporting force, reduces the processing difficulty of the honeycomb base plate and effectively reduces the secondary damage to the processed workpiece caused by the reflection of the base plate in the application process of industrial laser.

Description

Honeycomb bottom plate suitable for laser cutting machine
Technical Field
The invention relates to the field of industrial laser equipment, in particular to a honeycomb baseplate suitable for a laser cutting machine.
Background
At present, in industrial laser equipment such as a laser cutting machine, in order to avoid secondary loss of a workpiece caused by laser penetrating through the workpiece to reach a cutting platform and being reflected by the cutting platform, a honeycomb bottom plate is usually laid on the cutting platform, so that sufficient supporting force is provided and the area of a reflecting surface is reduced as much as possible.
However, in the processing process of the honeycomb base plate, when the base plate breadth is increased to a certain area, the cross section of the material forming the honeycomb grid is gradually widened due to the limitation of processing conditions and material characteristics, and the thickness of the grid wall of the finally formed honeycomb base plate is increased, namely the contact surface of the grid wall and the workpiece is larger. When the laser beam penetrates through the raw material, the laser beam can be irradiated and reflected on the cross section of the grid wall, and secondary damage can still be formed on the bottom surface of the processed material.
Disclosure of Invention
The invention aims to provide a honeycomb baseplate suitable for a laser cutting machine, which is subjected to targeted structural improvement, provides enough supporting force, reduces the processing difficulty of the honeycomb baseplate and effectively reduces the secondary damage to a processed workpiece caused by baseplate reflection in the application process of industrial laser.
In order to achieve the above purpose, with reference to fig. 1, the present invention provides a honeycomb substrate for a laser cutting machine, wherein the honeycomb substrate is horizontally laid on a cutting platform directly below a laser cutting device of the laser cutting machine;
the honeycomb bottom plate consists of a plurality of bottom plate unit cells, each bottom plate unit cell is formed by connecting and closing a certain amount of grid walls end to end, and adjacent bottom plate unit cells share one grid wall;
the grid wall has a first end and a second end in a vertical direction; the first end part is a horizontal end surface connected with the cutting platform; the second end portion is close to the laser cutting device and comprises a first end face, a second end face and a third end face which are sequentially connected, wherein:
the first end surface and the third end surface are inclined, symmetrically arranged at two sides of the second end surface and respectively form included angles A and A' with the upper surface of the honeycomb bottom plate.
Further, the length range of the honeycomb bottom plate is 4-12 meters.
Further, the thickness of the first end of the grid wall is 2-4 mm.
Furthermore, the second end face is a horizontal end face, and the width of the second end face is 0.2-0.4 mm.
Further, the second end face is an arc-shaped end face.
Furthermore, the value range of the included angles A and A' is 45-80 degrees.
Further, the calculation process of the values of the included angles a and a' includes:
setting the bottom plate unit cells to be square, and calculating to obtain values of included angles A and A' by combining the length-width ratio of the grid walls and the stress characteristics of the grid walls:
Figure BDA0002626477480000011
Figure BDA0002626477480000021
where h is the thickness of the cell walls, w is the width of the cell walls and the height of the honeycomb floor, l is the length of the cell walls and the side length of the floor cells, c is a scaling factor, influenced by the length to width ratio of the cell walls and the maximum horizontal force that the cell walls need to withstand, and F is the ratio of the cell walls to the maximum horizontal force that the cell walls need to withstandmaxIs the maximum horizontal force, F, that the wall of the grid needs to withstandmaxIs related to the own weight of the grid wall, the maximum friction force exerted on the grid wall by the workpiece to be machined.
Furthermore, N grooves are circumferentially arranged in the edge area of the honeycomb bottom plate, N supporting devices are circumferentially arranged on the side wall of the honeycomb bottom plate, and the supporting devices correspond to the grooves one to one;
the supporting device comprises a fixing mechanism, a supporting rod and a bearing platform;
the fixing mechanism is used for fixing the supporting rod on the side wall of the honeycomb bottom plate below the groove, the supporting rod is telescopically and vertically arranged outside the groove, the bearing platform is fixed at one end of the supporting rod, which is far away from the fixing mechanism, and is horizontally arranged right above the groove and matched with the groove in size; when the supporting rod extends, the bearing platform is positioned above the honeycomb bottom plate, so that a gap is formed between a workpiece to be processed positioned above the bearing platform and the upper surface of the honeycomb bottom plate; when the supporting rods shrink, the bearing platform carries the workpiece to be processed to vertically descend until the workpiece is connected with the honeycomb bottom plate; when the bracing piece further contracts, load-bearing platform and the work piece separation of treating processing continue to descend and accomodate to the recess in completely.
Further, the fixing mechanism comprises a base and a fastener;
the base passes through fastener fixed mounting on honeycomb bottom plate lateral wall, and its inside vertical rectangle through-hole that is provided with the guide rail along vertical direction on the rectangle through-hole inside wall, and the bracing piece passes the through-hole and installs on the guide rail, moves along the guide rail under the effect of external force.
Furthermore, the supporting device comprises (N-1) connecting rods, and the N supporting rods are fixedly connected together through the (N-1) connecting rods.
Compared with the prior art, the technical scheme of the invention has the following remarkable beneficial effects:
(1) the reflection cross section of the laser on the bottom plate after falling from the right top is reduced to the maximum extent, the secondary damage to the bottom surface of the processing material caused by the reflection of the laser is reduced, the defective rate is reduced, and the efficiency is increased.
(2) The workpiece is lifted by adopting the supporting device, the workpiece is vertically and slowly placed on the honeycomb bottom plate after the position of the workpiece is adjusted, and the damage to the honeycomb bottom plate caused by the movement of the workpiece is reduced, particularly in the stage of loading and unloading.
(3) The grooves for accommodating the bearing platform are formed in the periphery of the honeycomb bottom plate, so that structural interference between the supporting device and the honeycomb bottom plate is avoided.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a honeycomb substrate suitable for a laser cutting machine of the present invention.
Fig. 2 is a schematic view of the structure of a single cell wall of the present invention.
Fig. 3 is a schematic of the parameters of the cell walls of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
With reference to fig. 1 to 3, the present invention provides a honeycomb substrate for a laser cutting machine, which is horizontally laid on a cutting platform directly below a laser cutting device of the laser cutting machine.
The honeycomb bottom plate is composed of a plurality of bottom plate unit cells 10, each bottom plate unit cell 10 is formed by connecting and closing a certain amount of grid walls 20 end to end, and adjacent bottom plate unit cells 10 share one grid wall 20.
The mesh wall 20 has a first end and a second end in a vertical direction; the first end part is a horizontal end surface connected with the cutting platform; the second end portion is close to the laser cutting device and comprises a first end face 21, a second end face and a third end face 22 which are sequentially connected, wherein:
the first end face 21 and the third end face 22 are inclined, symmetrically arranged at two sides of the second end face, and respectively form included angles A and A' with the upper surface of the honeycomb baseplate.
With the further development of laser technology and the improvement of the requirements of the market on workpiece integration and integrity, the width and the length of a cutting platform of laser cutting equipment such as a laser cutting machine and a honeycomb bottom plate positioned above the cutting platform are also larger and larger, and are gradually increased from 3-4 meters to 7-8 meters, even more than 10 meters. Subject to processing conditions and material property limitations, the cross-section of the material comprising the honeycomb cells also widens (e.g., the thickness of cell walls 20 increases by about 1mm for every 2 meters increase in length of the floor). On the basis, the invention provides that the cross section of the honeycomb bottom plate grid wall is changed into a pointed cross section with a certain angle included angle from the traditional flat angle horizontal type, so that the reflection section of the laser falling from the right upper side on the bottom plate is reduced to the maximum extent, the secondary damage to the bottom surface of a processing material caused by laser reflection is reduced, the defective rate is reduced, the efficiency is increased, and the invention has obvious economic value.
In order to prevent the workpiece from being damaged by the pointed cross section, the second end part is formed by sequentially connecting a first end surface 21, a second end surface 23 and a third end surface 22, wherein the first end surface 21 and the third end surface 22 are inclined and symmetrically arranged at two sides of the second end surface 23 and form included angles A and A' with the upper surface of the honeycomb baseplate respectively. It should be understood that the floor cells 10 of the present invention are not limited to being square as in fig. 1, and other shapes such as hexagonal may be used.
Preferably, the second end surface 23 is a horizontal end surface, so as to increase the contact surface between the honeycomb substrate and the workpiece, and avoid scratching. Considering that the length of the grid wall 20 is typically greater than 1cm, i.e. the length of the second end surface 23 is typically greater than 1cm, the width of the second end surface 23 can be set smaller, for example, the width of the second end surface 23 is 0.2 mm.
More preferably, the second end face 23 is an arc-shaped end face, and the abrasion of the honeycomb bottom plate to the workpiece can also be effectively reduced by combining the set length of the mesh wall 20.
In some examples, the included angles A and A' range from 45 degrees to 80 degrees. Theoretically, when the included angle a is 45 °, the laser beam irradiated from right above is reflected to be a horizontal beam and is emitted to the opposite grid wall 20 on the other side, and then is reflected by the grid wall 20 on the other side and returns to the workpiece. The energy of the laser beam after the cutting of the workpiece, the air transmission and the two reflections is greatly attenuated, and the workpiece is difficult to be further damaged, so that the aim of protecting the workpiece is fulfilled.
Further, the values of the included angles a and a' are related to the following parameters:
setting the bottom plate unit cells to be square, and calculating to obtain values of included angles A and A' by combining the length-width ratio of the grid walls and the stress characteristics of the grid walls:
Figure BDA0002626477480000041
Figure BDA0002626477480000042
where h is the thickness of the cell walls, w is the width of the cell walls and the height of the honeycomb floor, l is the length of the cell walls and the side length of the floor cells (assuming that the floor cells have a cross-section in the shape of an equilateral rectangle), c is a scaling factor, influenced by the aspect ratio of the cell walls and the maximum horizontal force that the cell walls need to withstand, and F is the thickness of the cell walls, the width of the cell walls, and the height of the honeycomb floormaxIs the maximum horizontal force, F, that the wall of the grid needs to withstandmaxIs related to the own weight of the grid wall, the maximum friction force exerted on the grid wall by the workpiece to be machined.
Galvanized iron sheet (with the density of 7.86 g/cm) is usually selected at present for economic cost performance of enterprises3) Is a bottom plate material.
Assuming that the self-gravity to be borne by each grid wall is G, the thickness of the grid wall is 2-4 mm, and the length and the width are 1cm, G is 1X 0.4X 7.86X 9.8X 30N, or G is 1X 0.2X 7.86X 9.8X 15N. It follows that the dead weight of the cell walls and the dead weight of the honeycomb floor consisting of a large number of cell walls are not negligible.
In some examples, to simplify the calculation process and to sufficiently maintain the stability of the cell walls, in the case of a light workpiece to be processed (e.g., a workpiece to be processed whose weight is less than or equal to about the self-weight of the honeycomb base), the maximum horizontal force F that the cell walls may bear is set equal to the self-weight G, thereby simplifying the influencing parameter to the aspect ratio of the cell walls.
From the foregoing, the length, width and thickness of the mesh walls are balanced against one another. As a preferred example, the width of the mesh wall varies from one half of its length to the same length, and the tip portion of the mesh wall can be regarded as an isosceles triangle, and a' have the same included angle and are symmetrical in opposite directions. Practice proves that when the length and the width of the grid wall are equal, stress balance of the grid wall can be well maintained when the inclined edge of the isosceles triangle is equal to 3 times of the base, the base of the isosceles triangle is b, the difference value of the thickness h minus the length of the second end face is obtained, the inclined edge is 3b, cosA is 1/6, and angle a is 80 degrees. When the width of the grid wall is equal to one half of the length of the grid wall, the weight of the honeycomb bottom plate is reduced due to the increase of the side length of the unit grid, but the self-gravity to be born by the single grid wall is increased due to the great reduction of the arrangement density of the grid wall. In order to provide more supporting force, the value of the included angle needs to be reduced, the influence of the laser reflection angle is comprehensively considered, the inclined side of the isosceles triangle is set to be approximately equal to 0.7 of the base side, at the moment, cosA is 5/7, and angle a is approximately equal to 45 degrees.
In the case that the workpiece to be processed is heavy (for example, the weight of the workpiece to be processed is several times or ten times of the self weight of the honeycomb base plate) and the control on the laser reflection beam is more strict, the honeycomb base plate can be manufactured by the following method, which specifically comprises the following steps:
and S1, determining the size parameters of the honeycomb bottom plate according to the physical parameters of the workpiece to be processed.
And S2, determining the thickness of the iron sheet material for processing the honeycomb bottom plate and the size parameters of the grid walls including the width of the iron sheet for sharpening according to the size parameters of the honeycomb bottom plate and the processing technology.
And S3, calculating the maximum friction force possibly borne by the grid wall according to the gravity of the workpiece to be processed.
And S4, constructing a grid wall stress model, carrying out layering processing on the grid wall, and calculating stress data of each layer.
And S5, calculating the minimum thickness of each layer by combining the rigidity parameter and the deformation parameter of the iron sheet material.
And S6, calculating to obtain values of the included angles A and A ', if the value is greater than or equal to 45 degrees, taking the calculated value as the value of the final included angles A and A ', otherwise, taking 45 degrees as the value of the final included angles A and A ', and recalculating the thickness of the iron sheet material or the size parameter of the grid wall.
S7, selecting processing parameters of the iron sheet material and the honeycomb bottom plate, sharpening the iron sheet material according to the values of the final included angles A and A', enabling the thicknesses of the sharpened iron sheet material to be larger than or equal to the corresponding minimum thickness, and manufacturing the honeycomb bottom plate by adopting the processed iron sheet material.
In other examples, N grooves are circumferentially formed in the edge area of the honeycomb base plate, N supporting devices are circumferentially mounted on the side wall of the honeycomb base plate, and the supporting devices correspond to the grooves one to one.
The supporting device comprises a fixing mechanism, a supporting rod and a bearing platform.
The fixing mechanism is used for fixing the supporting rod on the side wall of the honeycomb bottom plate below the groove, the supporting rod is telescopically and vertically arranged outside the groove, the bearing platform is fixed at one end of the supporting rod far away from the fixing mechanism, and the bearing platform is horizontally arranged right above the groove and is matched with the groove in size.
Loading: firstly, extending the supporting rod to enable the bearing platform to be positioned above the honeycomb bottom plate, then moving the workpiece to be processed to the bearing platform, and jointly supporting the workpiece by the N bearing platforms, wherein a gap is formed between the workpiece to be processed and the upper surface of the honeycomb bottom plate and the workpiece is not contacted; after the position of the workpiece is adjusted, the supporting rod begins to retract, and when the supporting rod retracts, the bearing platform carries the workpiece to be processed to vertically descend until the workpiece is connected with the honeycomb bottom plate, and then the honeycomb bottom plate supports the workpiece; the bracing piece further contracts, makes bearing platform and the work piece separation of treating processing and continue to descend and accomodate to the recess in completely, accomplishes the process of going up.
The following process: and the supporting rod gradually extends, the bearing platform gradually rises until the bearing platform is connected with the processed workpiece, the workpiece is further lifted until the workpiece is separated from the honeycomb bottom plate, the bearing platform supports the weight of the workpiece, and the unloading mechanism of the laser cutting machine executes unloading operation, so that the honeycomb bottom plate is prevented from being abraded in the moving process of the workpiece. This approach is particularly useful for workpieces that are heavy or have a high coefficient of friction.
Preferably, the fixing mechanism comprises a base and a fastener.
The base passes through fastener fixed mounting on honeycomb bottom plate lateral wall, and its inside vertical rectangle through-hole that is provided with the guide rail along vertical direction on the rectangle through-hole inside wall, and the bracing piece passes the through-hole and installs on the guide rail, moves along the guide rail under the effect of external force. More preferably, the mounting position can be adjusted to fixed establishment to the work piece processing demand of adaptation difference, for example set up more than N recess on the honeycomb bottom plate lateral wall, fixed establishment can be according to actual demand adjustment self position, establishes corresponding relation with one of them recess.
In some examples, the supporting device comprises (N-1) connecting rods, and N supporting rods are fixedly connected together through the (N-1) connecting rods, so that synchronous lifting actions of all the supporting rods can be completed under the action of the same external force, and coordinated movement among the supporting rods is realized. The external force here can be realized by power devices such as a motor and a cylinder, and the details are not repeated here.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (10)

1. The honeycomb base plate suitable for the laser cutting machine is characterized in that the honeycomb base plate is horizontally laid on a cutting platform right below a laser cutting device of the laser cutting machine;
the honeycomb bottom plate consists of a plurality of bottom plate unit cells, each bottom plate unit cell is formed by connecting and closing a certain amount of grid walls end to end, and adjacent bottom plate unit cells share one grid wall;
the grid wall has a first end and a second end in a vertical direction; the first end part is a horizontal end surface connected with the cutting platform; the second end portion is close to the laser cutting device and comprises a first end face, a second end face and a third end face which are sequentially connected, wherein:
the first end surface and the third end surface are inclined, symmetrically arranged at two sides of the second end surface and respectively form included angles A and A' with the upper surface of the honeycomb bottom plate.
2. The honeycomb floor for a laser cutting machine according to claim 1, wherein the honeycomb floor has a length in the range of 4-12 meters.
3. The honeycomb substrate for a laser cutting machine according to claim 1, wherein the first end portion of the cell wall has a thickness of 2 to 4 mm.
4. The honeycomb substrate for a laser cutting machine according to claim 1, wherein the second end face is a horizontal end face, and the width of the second end face is 0.2 to 0.4 mm.
5. The honeycomb floor for a laser cutting machine according to claim 1, wherein the second end face is an arcuate end face.
6. The honeycomb substrate for the laser cutting machine according to claim 1, wherein the included angles a and a' range from 45 to 80 degrees.
7. The honeycomb base plate suitable for the laser cutting machine according to claim 1, wherein the base plate unit cells are square, and values of the included angles a and a' are calculated by combining the length-width ratio of the grid walls and the stress characteristics of the grid walls:
Figure FDA0002626477470000011
Figure FDA0002626477470000012
where h is the thickness of the cell walls, w is the width of the cell walls and the height of the honeycomb floor, l is the length of the cell walls and the side length of the floor cells, c is a scaling factor, influenced by the length to width ratio of the cell walls and the maximum horizontal force that the cell walls need to withstand, and F is the ratio of the cell walls to the maximum horizontal force that the cell walls need to withstandmaxIs the maximum horizontal force, F, that the wall of the grid needs to withstandmaxIs related to the own weight of the grid wall, the maximum friction force exerted on the grid wall by the workpiece to be machined.
8. The honeycomb base plate suitable for the laser cutting machine according to claim 1, wherein N grooves are circumferentially arranged in the edge area of the honeycomb base plate, N supporting devices are circumferentially arranged on the side wall of the honeycomb base plate, and the supporting devices correspond to the grooves one to one;
the supporting device comprises a fixing mechanism, a supporting rod and a bearing platform;
the fixing mechanism is used for fixing the supporting rod on the side wall of the honeycomb bottom plate below the groove, the supporting rod is telescopically and vertically arranged outside the groove, the bearing platform is fixed at one end of the supporting rod, which is far away from the fixing mechanism, and is horizontally arranged right above the groove and matched with the groove in size; when the supporting rod extends, the bearing platform is positioned above the honeycomb bottom plate, so that a gap is formed between a workpiece to be processed positioned above the bearing platform and the upper surface of the honeycomb bottom plate; when the supporting rods shrink, the bearing platform carries the workpiece to be processed to vertically descend until the workpiece is connected with the honeycomb bottom plate; when the bracing piece further contracts, load-bearing platform and the work piece separation of treating processing continue to descend and accomodate to the recess in completely.
9. The honeycomb panel for a laser cutting machine according to claim 8, wherein the fixing mechanism includes a base and a fastener;
the base passes through fastener fixed mounting on honeycomb bottom plate lateral wall, and its inside vertical rectangle through-hole that is provided with the guide rail along vertical direction on the rectangle through-hole inside wall, and the bracing piece passes the through-hole and installs on the guide rail, moves along the guide rail under the effect of external force.
10. The honeycomb base plate for a laser cutting machine according to claim 8, wherein the supporting means comprises (N-1) connecting rods, and the N supporting rods are fixedly connected together by the (N-1) connecting rods.
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