CN116811270A - Laser plastic welding method - Google Patents
Laser plastic welding method Download PDFInfo
- Publication number
- CN116811270A CN116811270A CN202310859416.8A CN202310859416A CN116811270A CN 116811270 A CN116811270 A CN 116811270A CN 202310859416 A CN202310859416 A CN 202310859416A CN 116811270 A CN116811270 A CN 116811270A
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- Prior art keywords
- welding
- plastic
- plastic part
- adhesive tape
- laser
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004023 plastic welding Methods 0.000 title claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 226
- 229920003023 plastic Polymers 0.000 claims abstract description 226
- 238000003466 welding Methods 0.000 claims abstract description 143
- 239000002390 adhesive tape Substances 0.000 claims abstract description 60
- 238000002844 melting Methods 0.000 claims abstract description 29
- 230000008018 melting Effects 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000007689 inspection Methods 0.000 claims abstract description 12
- 229920006352 transparent thermoplastic Polymers 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The application discloses a laser plastic welding method, which relates to the technical field of welding and comprises the following steps: arranging a welding adhesive tape on the welding surface of the first plastic part, and arranging a welding butt groove on the welding surface of the second plastic part; obtaining a first plastic part and a second plastic part to be welded and performing appearance inspection, wherein the first plastic part and the second plastic part are transparent thermoplastic plastics; overlapping the first plastic piece and the second plastic piece after appearance inspection, wherein the welding adhesive tape is abutted on the bottom wall of the welding abutting groove; projecting laser light to the first plastic part so that the temperature of the heating area is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape; after the welding adhesive tape is heated and melted, the temperature of the heating area is increased to be higher than the melting temperature of the second plastic part; and carrying out pressurization treatment on the first plastic piece and the second plastic piece so that the first plastic piece and the second plastic piece are tightly attached. The application has the effect of improving the connection tightness of the laser welding plastic.
Description
Technical Field
The application relates to the technical field of welding, in particular to a laser plastic welding method.
Background
The laser welding technology is a technology for welding two products by generating high-temperature dissolution through laser, and along with the development of novel material processing technology, plastic products are being widely applied to the fields of aviation, ships, automobiles, medical appliances, food packaging, daily chemical industry and the like due to the characteristics of light weight, corrosion resistance, good insulativity, excellent forming processability and the like of the plastic products, and the traditional materials such as metal, ceramic and the like are replaced in a large number.
The plastic laser welding technology is one kind of high efficiency and high precision plastic connecting technology and has great significance in the wide application of plastic product.
At present, common laser welding plastic is up-and-down stitch welding, wherein the upper plastic is a laser-transmitting material, the lower plastic is a laser-absorbing material, and the welding is realized by gradually heating and melting the lower plastic and adhering the lower plastic, but the welding strength of the mode is poor, and the improvement exists.
Disclosure of Invention
The present application is directed to a laser plastic welding method, which solves the problems set forth in the background art.
In order to achieve the above purpose, the present application provides the following technical solutions:
a laser plastic welding method comprising the steps of:
arranging a welding adhesive tape on the welding surface of the first plastic part, and arranging a welding butt groove on the welding surface of the second plastic part;
obtaining a first plastic part and a second plastic part to be welded and performing appearance inspection, wherein the first plastic part and the second plastic part are transparent thermoplastic plastics;
overlapping the first plastic piece and the second plastic piece after appearance inspection, wherein the welding adhesive tape is abutted on the bottom wall of the welding abutting groove;
projecting a laser beam onto the first plastic part such that the temperature of the heating region is below the melting temperature of the first plastic part and above the melting temperature of the welding strip;
after the welding adhesive tape is heated and melted, the temperature of the heating area is increased to be higher than the melting temperature of the second plastic part;
and carrying out pressurization treatment on the first plastic piece and the second plastic piece so that the first plastic piece and the second plastic piece are tightly attached.
Through adopting above-mentioned technical scheme, through setting up the welding adhesive tape at the welding face of first working of plastics, offer the welding butt groove at the welding face of second working of plastics, receive the laser beam to shine the back, the welding adhesive tape after melting produces earlier and melts, and the even shop of welding adhesive tape after melting covers in the welding butt inslot, and the rethread increases the temperature in heating area makes first working of plastics and second working of plastics closely laminate, has improved the compactness that first working of plastics and second working of plastics are connected.
Further, the step of arranging the welding adhesive tape on the welding surface of the first plastic part and arranging the welding butt groove on the welding surface of the second plastic part specifically comprises the following steps:
dust treatment is carried out on the welding surface of the first plastic part, and a welding adhesive tape is coated on the welding surface of the first plastic part;
adhering a welding adhesive tape to the edge and the center of the first plastic part, wherein the welding adhesive tape is a black opaque adhesive tape;
and welding abutting grooves are integrally formed on the welding surface of the second plastic part, and friction lines are formed at the bottoms of the welding abutting grooves.
Further, the step of obtaining the first plastic part and the second plastic part to be welded and performing appearance inspection specifically includes:
acquiring image data of a first plastic part and a second plastic part;
comparing the acquired image data with preset standard image data, and observing whether dust exists on the surfaces of the first plastic part and the second plastic part and burrs exist on the surfaces of the welding abutting grooves.
Further, the step of superposing the first plastic part and the second plastic part after appearance inspection, wherein the welding adhesive tape is abutted on the bottom wall of the welding abutting groove, specifically comprises the following steps:
placing the second plastic part on the operation table, and arranging the first plastic part above the second plastic part;
applying vertical pressure to the first plastic part to enable a welding adhesive tape arranged on the first plastic part to be abutted against the bottom of the welding abutting groove;
applying offset pressure to the first plastic part, wherein the offset pressure is smaller than the friction force between the welding adhesive tape and the bottom of the welding abutting groove, and detecting whether the first plastic part is offset;
if the first plastic piece deviates, observing whether the welding adhesive tape is attached to the bottom of the welding abutting groove.
Further, the step of projecting the laser beam onto the first plastic part so that the temperature of the heating area is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding strip specifically includes:
after the first plastic piece and the second plastic piece are overlapped, the contact area of the first plastic piece and the second plastic piece is a heating area;
projecting a laser beam to the first plastic part, wherein the temperature generated by the laser beam is gradually increased;
and when the laser is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape, observing whether the welding adhesive tape is melted, and stopping heating if the melting lasts for 5 seconds.
Further, an infrared laser or a semiconductor laser is used to project a laser beam onto the first plastic part.
Further, the area of the laser beam generated by the infrared laser or the semiconductor laser is larger than that of the first plastic piece, and the laser beam repeatedly moves above the first plastic piece along the center to the periphery.
Further, the step of pressurizing the first plastic part and the second plastic part to make the first plastic part and the second plastic part closely attached specifically includes:
an air pump is arranged below the second plastic part, an air outlet of the air pump is communicated with a pipe cover, and the second plastic part is covered on the pipe cover;
gradually increasing the air pressure of the air pump to enable the second plastic part to move along the direction approaching to the first plastic part under the action of the air pressure;
the method comprises the steps that a clamping plate is arranged on the peripheral side, where a first plastic piece and a second plastic piece are attached, of the clamping plate, an air inlet is formed in the clamping plate, and the air inlet and the peripheral side, where the first plastic piece and the second plastic piece are attached, are located on the same plane;
and (3) filling protective gas into the gas inlet to reduce the overheat oxidation of the plastic at the welding position.
Compared with the prior art, the application has the beneficial effects that: through setting up welding adhesive tape at the welding face of first working of plastics, offer welding butt groove at the welding face of second working of plastics, receive the laser beam to shine the back, welding adhesive tape produces earlier and melts, and the welding adhesive tape after melting evenly spreads in welding butt inslot, and the rethread raises the temperature of heating region makes first working of plastics and second working of plastics closely laminate, has improved the compactness that first working of plastics and second working of plastics are connected.
Drawings
FIG. 1 is a flow chart of steps of a method of welding laser plastic in accordance with the present application;
FIG. 2 is a flow chart of the sub-step of step S1;
FIG. 3 is a flow chart illustrating the sub-steps of step S2;
FIG. 4 is a flow chart illustrating the sub-steps of step S3;
FIG. 5 is a flow chart of the sub-step of step S4;
fig. 6 is a schematic flow chart of the substep of step S6.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1-3, the present application provides a technical solution: a laser plastic welding method comprising the steps of:
s1, arranging a welding adhesive tape on a welding surface of a first plastic part, and arranging a welding butt groove on a welding surface of a second plastic part. Specifically, referring to fig. 2, step S1 specifically includes the following sub-steps:
s101, carrying out dust treatment on the welding surface of the first plastic part, and coating a welding adhesive tape on the welding surface of the first plastic part. The first plastic piece is subjected to static electricity removing treatment to reduce residual dust on the welding surface.
S102, adhering the welding adhesive tape to the edge and the center of the first plastic piece, wherein the welding adhesive tape is a black opaque adhesive tape. The welding surface of the first plastic part is provided with an abutting lug in a forming mode, and the welding adhesive tape is arranged on the surface of the abutting lug. It should be noted that the welding strip is somewhat elastic and tacky and melts upon heating.
S103, integrally forming a welding abutting groove on the welding surface of the second plastic part, and forming friction lines on the groove bottom of the welding abutting groove.
S2, obtaining a first plastic part and a second plastic part to be welded and performing appearance inspection, wherein the first plastic part and the second plastic part are transparent thermoplastic plastics. Specifically, referring to fig. 3, step S2 includes the steps of:
s201, acquiring image data of a first plastic piece and a second plastic piece;
s202, comparing the acquired image data with preset standard image data, and observing whether dust exists on the surfaces of the first plastic part and the second plastic part and burrs exist on the surfaces of the welding abutting grooves
S3, overlapping the first plastic piece and the second plastic piece after appearance inspection, and abutting the welding adhesive tape on the bottom wall of the welding abutting groove. Referring to fig. 4, step S3 specifically includes the steps of:
s301, placing a second plastic part on an operation table, and arranging a first plastic part above the second plastic part;
s302, applying vertical pressure to the first plastic part, so that a welding adhesive tape arranged on the first plastic part is abutted to the bottom of a welding abutting groove;
s303, applying offset pressure to the first plastic part, wherein the offset pressure is smaller than the friction force between the welding adhesive tape and the bottom of the welding abutting groove, and detecting whether the first plastic part is offset;
s304, if the first plastic piece deviates, observing whether the welding adhesive tape is attached to the bottom of the welding abutting groove. In the above steps, the welding adhesive tape arranged on the first plastic part is abutted on the bottom of the welding abutting groove by applying vertical pressure to the first plastic part, and then offset pressure is applied to the first plastic part, wherein the offset pressure is smaller than the friction force between the welding adhesive tape and the bottom of the welding abutting groove, and when the friction force between the welding adhesive tape and the bottom of the welding abutting groove is at a normal value, namely the connection between the welding adhesive tape and the bottom of the welding abutting groove is relatively tight, the offset pressure is applied at the moment, and the first plastic part cannot be offset.
S4, projecting a laser beam to the first plastic part so that the temperature of the heating area is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape. Specifically, referring to fig. 5, step S4 specifically includes the following steps:
s401, after the first plastic piece and the second plastic piece are overlapped, a contact area of the first plastic piece and the second plastic piece is a heating area;
s402, projecting a laser beam to the first plastic piece, wherein the temperature generated by the laser beam is gradually increased. In the real-time example of the application, an infrared laser or a semiconductor laser is adopted to project a laser beam to the first plastic part, the area of the laser beam generated by the infrared laser or the semiconductor laser is larger than that of the first plastic part, and the laser beam repeatedly moves above the first plastic part along the center to the periphery.
S403, observing whether the welding adhesive tape is molten or not when the laser is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape, and stopping heating if the melting lasts for 5 seconds.
S5, after the adhesive tape to be welded is heated and melted, the temperature of the heating area is increased to be higher than the melting temperature of the second plastic piece.
S6, pressurizing the first plastic piece and the second plastic piece to enable the first plastic piece and the second plastic piece to be tightly attached. Specifically, referring to fig. 6, step S6 specifically includes the following sub-steps:
s601, arranging an air pump below the second plastic part, wherein an air outlet of the air pump is communicated with a pipe cover, and the second plastic part is covered on the pipe cover;
s602, gradually increasing the air pressure of the air pump, so that the second plastic piece moves in the direction approaching to the first plastic piece under the action of the air pressure;
s603, arranging clamping plates on the peripheral sides of the first plastic piece and the second plastic piece, wherein air inlets are formed in the clamping plates, and the air inlets are located on the same plane with the peripheral sides of the first plastic piece and the second plastic piece;
s604, filling protective gas into the air inlet to reduce the overheat oxidation of the plastic at the welding position. Wherein, the protective gas can adopt nitrogen or nitrogen.
Working principle: according to the application, the welding adhesive tape is arranged on the welding surface of the first plastic part, the welding abutting groove is arranged on the welding surface of the second plastic part, after being irradiated by the laser beam, the welding adhesive tape is melted, the melted welding adhesive tape is uniformly paved in the welding abutting groove, and then the temperature of the heating area is raised to enable the first plastic part and the second plastic part to be tightly attached, so that the connection compactness of the first plastic part and the second plastic part is improved.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A laser plastic welding method, comprising the steps of:
arranging a welding adhesive tape on the welding surface of the first plastic part, and arranging a welding butt groove on the welding surface of the second plastic part;
obtaining a first plastic part and a second plastic part to be welded and performing appearance inspection, wherein the first plastic part and the second plastic part are transparent thermoplastic plastics;
overlapping the first plastic piece and the second plastic piece after appearance inspection, wherein the welding adhesive tape is abutted on the bottom wall of the welding abutting groove;
projecting a laser beam onto the first plastic part such that the temperature of the heating region is below the melting temperature of the first plastic part and above the melting temperature of the welding strip;
after the welding adhesive tape is heated and melted, the temperature of the heating area is increased to be higher than the melting temperature of the second plastic part;
and carrying out pressurization treatment on the first plastic piece and the second plastic piece so that the first plastic piece and the second plastic piece are tightly attached.
2. A laser plastic welding method according to claim 1, characterized in that: the welding surface of the first plastic part is provided with a welding adhesive tape, and the welding surface of the second plastic part is provided with a welding butt groove, which comprises the following steps:
dust treatment is carried out on the welding surface of the first plastic part, and a welding adhesive tape is coated on the welding surface of the first plastic part;
adhering a welding adhesive tape to the edge and the center of the first plastic part, wherein the welding adhesive tape is a black opaque adhesive tape;
and welding abutting grooves are integrally formed on the welding surface of the second plastic part, and friction lines are formed at the bottoms of the welding abutting grooves.
3. A laser plastic welding method according to claim 1, characterized in that: the step of obtaining the first plastic part and the second plastic part to be welded and performing appearance inspection specifically comprises the following steps:
acquiring image data of a first plastic part and a second plastic part;
comparing the acquired image data with preset standard image data, and observing whether dust exists on the surfaces of the first plastic part and the second plastic part and burrs exist on the surfaces of the welding abutting grooves.
4. A laser plastic welding method according to claim 1, characterized in that: the step that will accomplish the first working of plastics and the second working of plastics after the outward appearance inspection coincide, welding adhesive tape butt is in welding butt groove bottom wall on the groove specifically includes:
placing the second plastic part on the operation table, and arranging the first plastic part above the second plastic part;
applying vertical pressure to the first plastic part to enable a welding adhesive tape arranged on the first plastic part to be abutted against the bottom of the welding abutting groove;
applying offset pressure to the first plastic part, wherein the offset pressure is smaller than the friction force between the welding adhesive tape and the bottom of the welding abutting groove, and detecting whether the first plastic part is offset;
if the first plastic piece deviates, observing whether the welding adhesive tape is attached to the bottom of the welding abutting groove.
5. A laser plastic welding method according to claim 1, characterized in that: the step of projecting the laser beam to the first plastic part to enable the temperature of the heating area to be lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape specifically comprises the following steps:
after the first plastic piece and the second plastic piece are overlapped, the contact area of the first plastic piece and the second plastic piece is a heating area;
projecting a laser beam to the first plastic part, wherein the temperature generated by the laser beam is gradually increased;
and when the laser is lower than the melting temperature of the first plastic part and higher than the melting temperature of the welding adhesive tape, observing whether the welding adhesive tape is melted, and stopping heating if the melting lasts for 5 seconds.
6. A laser plastic welding method according to claim 5, wherein: an infrared laser or a semiconductor laser is used to project a laser beam onto the first plastic part.
7. A laser plastic welding method according to claim 6, wherein: the laser beam area generated by the infrared laser or the semiconductor laser is larger than the area of the first plastic piece, and the laser beam repeatedly moves above the first plastic piece along the center to the periphery.
8. A laser plastic welding method according to claim 1, characterized in that: the step of pressurizing the first plastic part and the second plastic part to enable the first plastic part and the second plastic part to be closely attached specifically comprises the following steps:
an air pump is arranged below the second plastic part, an air outlet of the air pump is communicated with a pipe cover, and the second plastic part is covered on the pipe cover;
gradually increasing the air pressure of the air pump to enable the second plastic part to move along the direction approaching to the first plastic part under the action of the air pressure;
the method comprises the steps that a clamping plate is arranged on the peripheral side, where a first plastic piece and a second plastic piece are attached, of the clamping plate, an air inlet is formed in the clamping plate, and the air inlet and the peripheral side, where the first plastic piece and the second plastic piece are attached, are located on the same plane;
and (3) filling protective gas into the gas inlet to reduce the overheat oxidation of the plastic at the welding position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310859416.8A CN116811270A (en) | 2023-07-13 | 2023-07-13 | Laser plastic welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310859416.8A CN116811270A (en) | 2023-07-13 | 2023-07-13 | Laser plastic welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116811270A true CN116811270A (en) | 2023-09-29 |
Family
ID=88116634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310859416.8A Pending CN116811270A (en) | 2023-07-13 | 2023-07-13 | Laser plastic welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116811270A (en) |
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2023
- 2023-07-13 CN CN202310859416.8A patent/CN116811270A/en active Pending
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