CN106891532B - Polymer sheet packaging correction tool and correction method based on laser welding technology - Google Patents
Polymer sheet packaging correction tool and correction method based on laser welding technology Download PDFInfo
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- CN106891532B CN106891532B CN201710098274.2A CN201710098274A CN106891532B CN 106891532 B CN106891532 B CN 106891532B CN 201710098274 A CN201710098274 A CN 201710098274A CN 106891532 B CN106891532 B CN 106891532B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
Abstract
The invention discloses a polymer sheet packaging correction tool and a correction method based on a laser welding technology. The correcting tool comprises a correcting cover plate and a correcting bottom plate; and during correction, two polymer sheets are placed between the correction cover plate and the correction bottom plate and packaged by adopting a laser welding technology. The two polymer sheets consist of a thick sheet and a thin sheet, and both the lower surface of the correcting cover plate and the upper surface of the correcting bottom plate can be cambered surfaces with the same concave-convex direction and the same radian. The lower surface of the correcting cover plate can also be an inclined plane forming an included angle with the polymer sheet to be welded, and the upper surface of the correcting bottom plate is parallel to the polymer sheet to be welded. The correcting method can accurately control the deformation of the welded sheet, the power of the semiconductor laser is adjusted in a matching manner during welding, the deformation of the welding fluid pipeline is ensured to be in a controllable range, the correcting tool is utilized to guide the residual stress of the welded base cover plates with different thicknesses to be orderly controllable, the welded sheet is smooth, and the welding is firm and has no gap.
Description
Technical Field
The invention relates to a polymer sheet packaging correction tool and a correction method based on a laser welding technology, and belongs to the technical field of fluid chamber sheet packaging.
Background
The polymer material mostly has good optical property, electrical insulation property and thermal property, has good chemical inertness, is especially known by the advantages of easy processing, high replication precision, high production efficiency and the like, is an excellent choice for realizing the large-scale production of polymer sheet packaging, and is also the best choice after considering the technology and the cost so far. In recent years, polymer sheet products are more and more widely applied to the fields of scientific research and production, but the polymer sheet packaging technology is a bottleneck problem which limits mass production, so that the development of packaging technology with low cost, high efficiency, high reliability and simple operation is urgent for the practicability and industrialization of products.
At present, the common polymer sheet packaging methods mainly include: hot-press bonding, surface modification bonding, adhesive film bonding, solvent bonding, ultrasonic bonding, laser welding and the like. Various bonding modes have advantages and disadvantages, for example, hot-press bonding does not need to introduce any other materials and solvents, can ensure the biocompatibility of the chip, but the surface structure of the sheet is easy to deform, and the processing difficulty is high; the surface modification bonding adaptability is narrow, and the method is only suitable for individual materials; adhesive film bonding generally requires a thin (deformable) cover sheet for smooth bonding; solvent bonding easily leaves a solvent in the channel and is difficult to volatilize, so that the biocompatibility of the product is influenced; the ultrasonic bonding must design the energy guiding rib, increase the design difficulty and make the difficulty; during laser welding, high-strength laser beams are radiated to the surface of a processed material, the material absorbs the laser and converts the laser into heat energy through the interaction of the laser and the material, so that the upper sheet and the lower sheet are locally melted, and the bonding of the sheets is completed after cooling. Laser welding has many advantages for polymer sheet packaging, first, laser welding is very efficient, requiring only 3-5 minutes to weld a pair of 20 x 80mm sheets; secondly, laser welding can generate precise, firm and sealed packaging, and the welding strength is far higher than that of most other welding modes; thirdly, in the welding process, if the power of the laser is well controlled by the high polymer material, the material degradation is less, the debris and residues generated in the processing process are less, and the method is very suitable for large-scale production. The conventional laser welding method is generally used only for connecting a plurality of metal material edges to form a whole, and the metal edges are in a hot melting state. The bonding during the packaging of the polymer sheet is surface-to-whole surface bonding, although the polymer material is locally hot-melted essentially, because the size of the pipeline of the surface structure of the sheet is more than micron level, the hot-melting amount in the XY direction and the Z direction needs to be controlled within 10 μm, and the polymer material is easy to deform during processing. The deformation of the polymer sheet can cause interference in optical test, influence on the flow of fluid substances and even be directly incapable of being installed in a device clamping groove in the using process, so that the laser welding technology can be possibly applied to the fields of scientific research and production by strictly controlling the deformation.
Disclosure of Invention
The invention aims to provide a polymer sheet packaging correction tool and a correction method based on a laser welding technology, wherein the correction tool and the correction method can resist deformation of a polymer sheet after laser welding, so that the deformation is orderly controllable, and the warping degree is controllable.
The invention aims to provide a polymer sheet packaging correction tool based on a laser welding technology.
The invention provides a polymer sheet packaging correction tool based on a laser welding technology, which comprises a correction cover plate and a correction bottom plate, wherein the correction cover plate is arranged on the correction bottom plate; and during correction, two polymer sheets are placed between the correction cover plate and the correction bottom plate and packaged by adopting a laser welding technology.
In the correcting tool, the thickness of the two polymer sheets is different; when the two polymer sheets consist of thick sheets and thin sheets, the lower surface of the correcting cover plate and the upper surface of the correcting bottom plate can be cambered surfaces with the same concave-convex directions and the same radians. The concave-convex directions are consistent, namely when the lower surface of the correcting cover plate is a convex arc surface, the upper surface of the correcting bottom plate is a concave arc surface corresponding to the lower surface of the correcting cover plate; on the contrary, when the lower surface of the correcting cover plate is a concave arc surface, the upper surface of the correcting bottom plate is a convex arc surface corresponding to the correcting bottom plate.
In the correcting tool, when the thick sheet and the thin sheet are arranged between the correcting cover plate and the correcting bottom plate, the thick sheet and the convex cambered surface in the correcting tool are arranged adjacently. Specifically, when the sheet is located above, the lower surface of the correcting cover plate is a concave arc surface, and the upper surface of the correcting base plate is a corresponding convex arc surface; on the contrary, when the thick sheet is positioned above the correcting cover plate, the lower surface of the correcting cover plate is a convex arc surface, and the upper surface of the correcting bottom plate is a corresponding concave arc surface.
In the correction tool, the shape of the arc surface can be determined according to the warping shape of the polymer sheet when the correction tool is not used, and the deformation of the polymer sheet after laser welding is resisted through the arrangement of the reverse arc. The radian of the cambered surface can be determined according to the warping degree of the polymer sheet when the correction tool is not used. In the embodiment of the invention, 10 pieces or more are prepared without using a correction tool, the warping degree is measured by using a feeler gauge, and then the measured value is averaged, and the value determines the arc of the reverse arc, namely the arc of the arc surface.
In the above-mentioned correction tool, no matter the two polymer sheets have the same or different thicknesses, the lower surface of the correction cover plate can be an inclined surface forming an included angle with the polymer sheet to be welded (such as a horizontal plane), and the upper surface of the correction bottom plate is parallel to the polymer sheet to be welded (such as a horizontal plane).
In the above-mentioned correction frock, the contained angle can be 2.3 ~ 2.9 degrees, specifically can be 2.3 degrees or 2.9 degrees. For example, when the package of various regular-shaped polymer sheets within 150 x 150mm is corrected, the starting end of the inclined plane can be 0.8-1 mm higher than the tail end.
In the correction tool, the inclined direction of the inclined plane is perpendicular to the laser welding path or the tangent line of the polymer sheet to be welded. The lower surface of the corrective cover plate and the upper surface of the corrective base plate may be square, rectangular, circular or any other shape. For example, the polymer sheet to be welded is square, and the laser welding path is a straight line; the bevel is located in a direction perpendicular to the laser welding path. Specifically, the square shape is a rectangle, the direction of the laser welding path is a long axis direction, and the inclination direction of the inclined plane is located in a short axis direction of the rectangle; the square is a square, the direction of the laser welding path is any side length direction, and the inclined direction of the inclined plane is located in the other side length direction of the square. For another example, the polymer sheet to be welded is a circle, and the laser welding path is a spiral line with the center of the circle as the center; the inclined plane is positioned in any diameter direction of the circle.
In the correcting tool, the two polymer sheets are arranged between the correcting cover plate and the correcting base plate, and the distance between the correcting cover plate and the correcting base plate is smaller than or equal to the sum of the thicknesses of the two polymer sheets.
In the correction tool, the correction cover plate and the correction bottom plate can be made of aluminum alloy or stainless steel.
The correcting tool can be particularly used for packaging chips, namely packaging two polymer sheets in the chips by adopting a laser welding technology.
The second purpose of the invention is to provide a method for correcting the polymer sheet by using the correcting tool.
The invention provides a method for correcting a polymer sheet by using the correcting tool, which comprises the following steps:
(1) spraying a welding agent on the surface of the polymer sheet to be welded; (2) and (2) after the polymer sheet processed in the step (1) is assembled, placing the assembled polymer sheet between a correction cover plate and a correction bottom plate of the correction tool to enable the polymer sheet, the correction cover plate and the correction bottom plate to be tightly attached and fixed, and performing laser welding on the fixed polymer sheet to realize correction.
In the above method, when the two polymer sheets to be welded are composed of a thick sheet and a thin sheet, in the step (1), the spraying is a step-type spraying, and the specific steps are as follows: spraying a welding agent on the whole thick sheet for the first time; and a second spraying step, namely, arranging the shielding tool on the upper surface of the polymer sheet subjected to the first spraying step, and spraying again after the two ends or the edge part of the sheet is exposed.
Specifically, the polymer sheet to be welded is square, and the second spraying pass is performed with both ends of the sheet exposed in the direction of the laser welding path. For example, when the polymer sheet is rectangular, both ends of the sheet are exposed along the long axis direction of the rectangle; when the polymer sheet is square, both ends of the sheet are exposed in a direction perpendicular to the side length of the laser welding path. The polymer sheet to be welded is circular and the second spraying pass is performed with the edge portions of the sheet exposed.
Preferably, the polymer sheet to be welded is square, and the exposed width is 1/5-1/10 of the length of the polymer sheet along the laser welding direction. For example, the length of the polymer sheet is 100cm along the laser welding direction, and the width of each end is 10-20 mm.
Preferably, the polymer sheet to be welded is circular, and the width of the exposed edge portion is 1/5-1/10 of the radius of the polymer sheet. For example, the radius of the polymer sheet is 100mm, and the width of the edge part can be 10-20 mm.
In the method, when the two polymer sheets to be welded are composed of a thick sheet and a thin sheet, in the step (2), in the attaching process, the thick sheet is placed adjacent to the convex cambered surface in the correcting tool. When the lower surface of the correcting cover plate is a concave arc surface and the upper surface of the correcting bottom plate is a corresponding convex arc surface, the sheet is positioned above the correcting cover plate; on the contrary, when the lower surface of the correcting cover plate is a convex arc surface and the upper surface of the correcting bottom plate is a corresponding concave arc surface, the thick plate is positioned above the correcting cover plate.
In the above correction method, the material of the polymer sheet may be any sheet that can be encapsulated by laser welding technology, at least one of the two polymer sheets can transmit most of the laser light with specific wavelength, most of the laser energy can reach the interface of the two sheets, and at the interface, the most of the laser energy is converted into heat energy to cause local melting of the material near the interface, thereby welding the two sheets together, including but not limited to: polymethyl methacrylate (PMMA), Polycarbonate (PC), cycloolefin polymer (COP), and Polystyrene (PS). The two sheets may be the same or different, but their melting point temperatures are not different too much.
The invention has the following beneficial effects:
the correction method can accurately control the deformation of the polymer sheet after welding, the power of the semiconductor laser is adjusted in a matching manner during welding, the deformation of the welding fluid pipeline is ensured to be in a controllable range, the wedge-shaped correction tool is utilized to guide the residual stress of the base cover plates with different thicknesses after welding to be orderly controllable, the welded sheet is smooth, the welding is firm and free of gaps, and the subsequent use is facilitated.
Drawings
Fig. 1 is a schematic structural view of a straightening tool with a rectangular cross section in example 1, and a welding path is a straight line along the long axis direction of the rectangle, wherein fig. 1(a) is a schematic longitudinal section (front view) of a sheet straightening cover plate in the straightening tool along the long axis direction of the rectangle; fig. 1(C) is a schematic longitudinal sectional view (front view) of the leveling base plate corresponding to the leveling cover plate in fig. 1 (a); fig. 1 (a') is a schematic longitudinal sectional view (front view) of a slab straightening cover plate in an upper straightening tool along the long axis direction of a rectangle; fig. 1(C ') is a schematic longitudinal sectional view (front view) of the corrective baseplate corresponding to fig. 1 (a').
Fig. 2 is a schematic view of staged spraying, where fig. 2(a) is a schematic view of a first full-wafer spraying, and fig. 2(B) is a schematic view of a second spraying after shielding by using a shielding tool.
Fig. 3 is a photograph of a polymer sheet after being sealed and straightened by the straightening tool of example 1, wherein fig. 3(a) is a side view and fig. 3(C) is a top view after being straightened.
Fig. 4 is a schematic structural view of a straightening tool having a rectangular cross section in example 2, wherein a welding path is a straight line along a long axis direction of the rectangle, and fig. 4(B) is a schematic longitudinal sectional view (side view) of a straightening cover plate in the straightening tool along a short axis direction of the rectangle; fig. 4(D) is a schematic longitudinal sectional view (side view) of the leveling base plate corresponding to fig. 4 (B).
Fig. 5 is a photograph of a polymer sheet after being sealed and straightened by the straightening tool of example 2, wherein fig. 5(B) is a side view after being straightened, and fig. 5(D) is a top view after being straightened.
Fig. 6 is a schematic structural view of the straightening tool with a circular cross section in embodiment 4, where a welding path is a spiral line with a circular center as a center, and fig. 6(a) is a schematic longitudinal section view (front view) of a straightening cover plate in the straightening tool with a thick plate on the straightening tool along a certain diameter direction; fig. 6(B) is a schematic longitudinal sectional view (side view) of the leveling cover plate in the leveling tool with the thick plate on top, along a diameter direction perpendicular to the diameter direction in fig. 6 (a); fig. 6(C) is a schematic longitudinal sectional view (front view) of the correcting base plate corresponding to fig. 6 (a).
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The invention provides a polymer sheet packaging correction tool based on a laser welding technology, which comprises a correction cover plate and a correction bottom plate; during correction, two polymer sheets are placed between a correction cover plate and a correction bottom plate and packaged by adopting a laser welding technology; the correcting cover plate is a flat plate I, and a bulge is arranged on the lower surface of the flat plate I; the correcting bottom plate is a flat plate II, and a groove matched with the bulge is formed in the upper surface of the flat plate II.
Preferably, when two polymer sheets comprise thick sheets and thin sheets, the lower surfaces of the protrusions and the upper surfaces of the grooves can be cambered surfaces with the same concave-convex directions and the same radians, and when the thick sheets and the thin sheets are placed between the correcting cover plate and the correcting bottom plate, the thick sheets are placed adjacent to the cambered surfaces of the protrusions in the correcting tool. When the sheet is positioned above the groove, the lower surface of the groove is a concave cambered surface, and the upper surface of the groove is a corresponding convex cambered surface; on the contrary, when the thick sheet is positioned above, the lower surface of the bulge is a convex cambered surface, and the upper surface of the correcting bottom plate is a corresponding concave cambered surface. The shape of cambered surface and the size of radian are by when not using the correction frock, and the shape of warping and warping degree of polymer sheet are decided, and the specific accessible does not use the correction frock earlier and prepares 10 and more, uses the clearance gauge to measure the degree of warping, then gets the average value with the numerical value that measures, and this numerical value decides the anti-arc radian.
Preferably, the lower surface of the protrusion can be an inclined surface forming an included angle of 2.3 to 2.9 degrees with the polymer sheet to be welded (such as a horizontal plane) regardless of whether the thicknesses of the two polymer sheets are the same or not, and the inclined direction of the inclined surface is perpendicular to the laser welding path of the polymer sheet to be welded or a tangent line thereof; the bottom surface of the groove is parallel to the polymer sheet to be welded (e.g., horizontal).
In the correction process, after the surface of the polymer sheet to be welded is sprayed with the welding agent, the two polymer sheets are placed in a cavity formed after the protrusion and the groove are matched; in the chamber, the distance between the lower surface of the protrusion and the bottom surface of the groove is less than or equal to the sum of the thicknesses of the two polymer sheets; the lower surface of the correcting cover plate, the polymer sheet and the upper surface of the correcting bottom plate are tightly attached and fixed through the buckles, and the fixed polymer sheet is subjected to laser welding, so that correction can be realized.
The method comprises the steps of designing correction tools with different shapes and structures according to the shape of a polymer sheet to be packaged, and correcting the polymer sheet by adopting a laser welding technology during packaging. The cross section of the lower surface of the correcting cover plate can be rectangular, square, round and any other shape. Hereinafter, the correction tool and the correction method for different shapes used when the thicknesses of two polymer sheets in a chip are different will be described in detail with reference to the drawings of the specification, but the present invention is not limited to the following embodiments.
Example 1 tool and method for correcting polymer sheet packaging based on laser welding technology (rectangular sheet)
First, correct frock
In this embodiment, the two polymer sheets to be welded are rectangular, 20 × 88mm in size, 1mm and 2mm in thickness, and are made of PMMA.
The polymer sheet of this example was a rectangular sheet and the laser welding path was the long axis direction of the rectangular polymer sheet. As shown in fig. 1, the correcting tool of the embodiment includes a correcting cover plate and a correcting base plate; during correction, two polymer sheets are placed between a correction cover plate and a correction bottom plate and packaged by adopting a laser welding technology; the correcting cover plate is a flat plate I, the lower surface of the flat plate I is provided with a protrusion (the area of a rectangular sheet is larger than or equal to that of the rectangular sheet) with a rectangular cross section, the correcting bottom plate is a flat plate II, and the upper surface of the flat plate II is provided with a groove matched with the protrusion. When the sheet is on, along the long axis direction of the rectangle, the lower surface of the protrusion is a concave arc surface formed by gradually bending outwards from the middle axis to two sides, as shown in fig. 1 (a); correspondingly, along the long axis direction of the rectangle, the lower surface of the groove is a convex cambered surface which is formed by gradually bending inwards from the middle axis to two sides, as shown in fig. 1 (C); when the slab is on, along the long axis direction of the rectangle, the lower surface of the protrusion is a convex arc surface formed by gradually bending inward from the middle axis to both sides, as shown in fig. 1 (a'). Accordingly, along the long axis direction of the rectangle, the upper surface of the groove is a concave arc surface formed by gradually bending outward from the middle axis to both sides, as shown in fig. 1 (C').
Second, correction method
The rectangular sheet is rectified as follows:
(1) staged spraying of polymer sheets
1) Spraying for the first time: the thicker sheet was sprayed with a mist of solder (the amount of solder varied depending on the size and shape of the product, 0.4ml for a rectangle of 20 x 88 mm) uniformly over the entire thickness, as shown in fig. 2 (a).
2) And (3) second spraying: the shielding tool is placed on the upper surface of the sheet material which is subjected to the first spraying, two edge portions of the chip in the long axis direction are exposed, two edges are respectively exposed by 1cm, and the shielded sheet material is sprayed again (the used welding agent and the spraying amount are the same as those in the first spraying), as shown in fig. 2 (B).
(2) Laser welding in arranging correction tool
The solder to be welded is completely volatilized (the solder contains ethanol solution, so the volatilization speed is very high), and the two sheets are placed in the correction tool in the embodiment after being assembled, and the specific steps are as follows: after being assembled, the two sheets are placed between the correction cover plate and the correction bottom plate to be tightly attached and fastened by a buckle. And packaging the polymer sheet by adopting a laser welding technology, controlling the linear shape of the laser to be linear stepping, controlling the direction to be along the long axis direction, and completing the packaging of the polymer sheet after the laser and the workpiece interface react to form local melting and cooling.
In the embodiment, in the second spraying process, the exposed widths of the two sides can be adjusted to be 8.8-17.6 mm.
As shown in fig. 3(a) and 3(C), it can be seen from the effect diagram of the packaged polymer sheet corrected by the correction tool and the correction method of the present embodiment that the leveling deformation is small and the dense deformation of the sheet welded after the welding of the polymer sheet corrected by the correction tool and the correction method of the present embodiment is controllable. And the polymer sheet which is not corrected deforms after welding, the warping degree is uncontrollable, and the deformation disorder of the sheet is uncontrollable.
Embodiment 2 correction tool and correction method for polymer sheet packaging based on laser welding technology (rectangular sheet)
First, correct frock
The two polymer sheets to be welded were the same as in example 1.
The correction tool is the same as the correction tool in the embodiment 1, and is different from the correction tool in that: along the minor axis of the rectangle, the lower surface of the protrusion is also a slope with an angle of 2.5 degrees with the polymer sheet to be welded (e.g. horizontal plane), as shown in fig. 4 (B); the bottom surface of the groove is parallel to the polymer sheet to be welded (e.g., horizontal) along the minor axis of the rectangle, as shown in fig. 4 (D).
Second, correction method
The correction method was the same as in example 1.
As shown in fig. 5(B) and 5(D), it can be seen from the effect diagram of the packaged polymer sheet corrected by the correction tool and the correction method of the present embodiment that the leveling deformation is very small and the dense deformation of the sheet welded after the welding of the polymer sheet corrected by the correction tool and the correction method of the present embodiment is controllable.
Example 3 correction tool and correction method for polymer sheet packaging based on laser welding technology (Square sheet)
First, correct frock
The polymer sheet of this example was a square sheet and the laser welding path was the side length direction of the square polymer sheet. The correcting tool comprises a correcting cover plate and a correcting bottom plate; during correction, two polymer sheets are placed between a correction cover plate and a correction bottom plate and packaged by adopting a laser welding technology; the correcting cover plate is a flat plate I, and a bulge with a square cross section (the square area is larger than or equal to the area of the sheet material) is arranged on the lower surface of the flat plate I; the correcting bottom plate is a flat plate II, and a groove matched with the bulge is formed in the upper surface of the flat plate II. Taking the thick sheet as an example, along the side length direction of the laser welding path, the lower surface of the correcting cover plate is a convex cambered surface formed by gradually bending inwards from the middle axis to two sides; along the side length direction vertical to the laser welding path, the lower surface of the bulge is an inclined surface which forms an included angle of 2.9 degrees with the polymer sheet to be welded (such as a horizontal plane); correspondingly, the upper surface of the correcting bottom plate is a concave arc surface which is formed by gradually bending outwards from the middle axis to the two sides; the bottom surface of the groove is parallel to the polymer sheet to be welded (e.g., horizontal) along a side length perpendicular to the laser welding path.
In this embodiment, the included angle of the inclined plane can be adjusted between 2.3 degrees and 2.9 degrees.
Second, correction method
The same as in example 1.
Example 4 correction tool and correction method for polymer sheet packaging based on laser welding technology (round sheet)
First, correct frock
The polymer sheet of this example is circular, and the laser welding path is a spiral line centered at the center of the circle of the circular polymer sheet. As shown in fig. 6, the correcting tool of the present embodiment includes a correcting cover plate and a correcting base plate; during correction, two polymer sheets are placed between a correction cover plate and a correction bottom plate and packaged by adopting a laser welding technology; the correcting cover plate is a flat plate I, and a bulge with a circular cross section (the circular area is larger than or equal to the area of the sheet material) is arranged on the lower surface of the flat plate I; the correcting bottom plate is a flat plate II, and the upper surface of the flat plate II is provided with a groove matched with the bulge; taking the thick sheet as an example, along the radius direction of the circle, the lower surface of the correction cover plate is a convex arc surface formed by gradually bending inwards from the center of the circle to the periphery, as shown in fig. 6 (a); along a certain diameter direction of the circle, the cross section of the diameter direction on the lower surface of the protrusion is also an inclined plane which forms an included angle of 2.3 degrees with the polymer sheet to be welded (such as a horizontal plane), as shown in fig. 6 (B); accordingly, along the radius direction of the center of the circle, the upper surface of the leveling base plate is a concave arc surface which is formed by gradually bending outward from the center of the circle to the periphery, and the cross section of the concave arc surface is parallel to the polymer sheets to be welded, as shown in fig. 6 (C).
In this embodiment, the included angle of the inclined plane can be adjusted between 2.3 degrees and 2.9 degrees.
Second, correction method
The round sheet is corrected according to the following steps:
as in example 1, the edges of the polymer sheet were exposed only during the second spray. And when in laser welding, the laser traveling line is controlled to be spirally stepped.
Claims (7)
1. The utility model provides a frock is corrected in polymer sheet encapsulation based on laser welding technique which characterized in that: it comprises a correction cover plate and a correction bottom plate; during correction, two polymer sheets are placed between the correction cover plate and the correction bottom plate and packaged by adopting a laser welding technology;
the two polymer sheets consist of a thick sheet and a thin sheet, and the lower surface of the correcting cover plate and the upper surface of the correcting bottom plate are both cambered surfaces with the same concave-convex direction and the same radian; when the sheet is positioned above the correcting cover plate, the lower surface of the correcting cover plate is a concave arc surface, and the upper surface of the correcting bottom plate is a corresponding convex arc surface; on the contrary, when the thick sheet is positioned above, the lower surface of the correcting cover plate is a convex arc surface, and the upper surface of the correcting bottom plate is a corresponding concave arc surface;
the lower surface of the correcting cover plate is an inclined plane forming an included angle with the polymer sheet to be welded, and the upper surface of the correcting bottom plate is parallel to the polymer sheet to be welded;
the slope of the ramp is oriented perpendicular to the laser welding path of the polymer sheets to be welded or a tangent thereto.
2. The correction tool of claim 1, wherein: when the thick sheet and the thin sheet are arranged between the correcting cover plate and the correcting bottom plate, the thick sheet and the convex cambered surface in the correcting tool are arranged adjacently.
3. The correction tool of claim 1, wherein: the included angle is 2.3-2.9 degrees.
4. The correction tool of claim 1, wherein: the polymer sheet to be welded is square, the laser welding path is a straight line, and the inclined plane is positioned in the direction perpendicular to the laser welding path; the polymer sheet to be welded is circular, the laser welding path is a spiral line taking the circle center of the circle as the center, and the inclined plane is located in any diameter direction of the circle.
5. A method for straightening a polymer sheet by using the straightening tool of any one of claims 1 to 4, comprising the following steps:
(1) spraying a welding agent on the surface of the polymer sheet to be welded; (2) and (2) after the polymer sheet processed in the step (1) is assembled, placing the assembled polymer sheet between a correction cover plate and a correction bottom plate of the correction tool to enable the polymer sheet, the correction cover plate and the correction bottom plate to be tightly attached and fixed, and performing laser welding on the fixed polymer sheet to realize correction.
6. The method of claim 5, wherein: the two polymer sheets to be welded are composed of thick sheets and thin sheets, and in the step (1), the spraying is stage spraying, and the specific steps are as follows: spraying a welding agent on the whole thick sheet for the first time; second spraying, namely placing a shielding tool on the upper surface of the polymer sheet subjected to the first spraying, and spraying again after two ends or edge parts of the sheet are exposed; and/or in the step (2), in the fitting process, the thick sheet is adjacent to the raised cambered surface in the correcting tool.
7. The method of claim 6, wherein: in the step (1), the polymer sheet to be welded is square, and the exposed width of the square is 1/5-1/10 of the length of the polymer sheet along the laser welding direction; the polymer sheet to be welded is circular, and the width of the exposed edge part is 1/5-1/10 of the radius of the polymer sheet.
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| CN201710098274.2A CN106891532B (en) | 2017-02-22 | 2017-02-22 | Polymer sheet packaging correction tool and correction method based on laser welding technology |
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| CN201710098274.2A CN106891532B (en) | 2017-02-22 | 2017-02-22 | Polymer sheet packaging correction tool and correction method based on laser welding technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266776A (en) * | 1999-01-28 | 2000-09-20 | 莱斯特加工技术公司 | Laser welding method and apparatus for welding plastic workpiece or plastics or other materials |
| CN1753160A (en) * | 2004-09-21 | 2006-03-29 | 中华映管股份有限公司 | Joining technology of chip-glass, hot press technology and its device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266776A (en) * | 1999-01-28 | 2000-09-20 | 莱斯特加工技术公司 | Laser welding method and apparatus for welding plastic workpiece or plastics or other materials |
| CN1753160A (en) * | 2004-09-21 | 2006-03-29 | 中华映管股份有限公司 | Joining technology of chip-glass, hot press technology and its device |
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