CN114571737A - Laser welding method and device - Google Patents
Laser welding method and device Download PDFInfo
- Publication number
- CN114571737A CN114571737A CN202011383990.3A CN202011383990A CN114571737A CN 114571737 A CN114571737 A CN 114571737A CN 202011383990 A CN202011383990 A CN 202011383990A CN 114571737 A CN114571737 A CN 114571737A
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- Prior art keywords
- plastic
- welding
- laser
- circular
- pipes
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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
- B29C65/14—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
-
- 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
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7841—Holding or clamping means for handling purposes
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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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Laser Beam Processing (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to a laser welding method and a device, which are applied to welding between two circular plastic pipes, and the method comprises the following steps: enabling the two plastic circular pipes to be butted and in a state to be welded; and a laser welding head which emits welding laser along the axis of the plastic circular pipes is matched with a reflecting lens which can rotate around the axis, so that the welding laser irradiates the inner wall of the butt joint of the two plastic circular pipes, and the two plastic circular pipes are welded together. The laser welding method of the invention does not need rotary motion, reduces corresponding tool fixtures, only needs to rotate the reflection lens to enable the welding laser circumference to uniformly irradiate on the inner wall of the butt joint of the two plastic circular pipes, enables the two layers of plastics at the butt joint to be tightly melted together under the action of the pressing plate of the external clamping mechanism, forms effective welding seams after cooling, and also ensures the surface smoothness of the welded plastic circular pipes.
Description
Technical Field
The invention belongs to the technical field of laser plastic welding, and particularly relates to a laser welding method and device.
Background
The traditional plastic and plastic welding generally adopts an adhesive mode for connection, on one hand, glue is used as a consumable product, so that the connection cost is increased, on the other hand, the requirement of adhesion on the surface cleanliness is high, and the possibility of oxidation adhesion force reduction exists; the plastic and the plastic are connected to form interatomic combination, and the firm connection is realized only by the acting force between molecules. Nowadays, laser has been used as an industrial basic processing method in more and more industrial application fields. The connection of the plastic to the plastic is achieved by laser without the need for additional solid adhesives or assembly elements, and laser machining as a flexible machining method can achieve efficient automatic welding. Generally, laser is needed to be used for welding a plastic circular tube vertically on the surface of plastic, but the light transmittance of an upper layer material is greatly influenced by the welding mode, and the inner wall of the circular tube is not easily supported effectively, so that the welding strength and the appearance are poor.
Disclosure of Invention
The invention aims to at least solve the defects in the prior art to a certain extent and provides a laser welding method and a laser welding device.
In order to achieve the above object, an embodiment of the present invention provides a laser welding method applied to welding two circular plastic pipes, including the following steps:
s10, butting the two plastic circular pipes and enabling the two plastic circular pipes to be in a state to be welded;
and S20, matching a laser welding head which emits welding laser along the axis of the circular plastic pipes with a reflecting lens which can rotate around the axis, so that the welding laser irradiates on the inner wall of the butt joint of the two circular plastic pipes, and the two circular plastic pipes are welded together.
Preferably, the step S10 specifically includes a step of inserting the two circular plastic tubes into each other, and a step of clamping and fixing the two inserted circular plastic tubes by a clamping mechanism.
Preferably, step S10 is preceded by a step of performing decontamination treatment on a welding surface of the two circular plastic pipes during mutual insertion.
Preferably, the clamping mechanism comprises two opposite pressing plates and a driving cylinder for driving the two pressing plates to approach or separate from each other, and the opposite inner sides of the two pressing plates are cambered surfaces matched with the outer wall of the plastic circular tube;
the step of clamping and fixing the two plastic circular tubes specifically comprises the step of starting the driving cylinder to enable the two pressing plates to be close to each other so as to clamp the butt joint of the two plastic circular tubes.
Preferably, in step S20, the welding laser emitted by the laser welding head is a continuous light, and the mirror is disposed on the axis of the circular plastic tube in an inclined manner and rotates around the axis at a constant speed.
The invention also provides a laser welding device, which is applied to welding between two circular plastic pipes and comprises the following components:
the clamping mechanism is used for clamping and fixing two mutually butted plastic circular pipes and enabling the two mutually butted plastic circular pipes to be in a state to be welded;
the laser welding machine is provided with a laser welding head which emits welding laser along the axis of the plastic circular tubes, a reflecting lens which is arranged on the axis in an inclined mode and used for reflecting the welding laser to the inner wall of the joint of the two plastic circular tubes, and a rotating mechanism which drives the reflecting lens to rotate around the axis, so that the welding laser can complete welding work in the rotating process of the reflecting lens.
Preferably, the clamping mechanism comprises two opposite pressing plates and a driving cylinder for driving the two pressing plates to approach or separate from each other, and the opposite inner sides of the two pressing plates are cambered surfaces matched with the outer wall of the plastic circular tube.
Preferably, the pressing plate is of a semicircular structure.
Preferably, the rotating mechanism includes a rotating bracket for mounting the mirror plate, and a driving motor for driving the rotating bracket to rotate.
Preferably, a pitch adjusting component is further arranged between the reflecting mirror and the rotating bracket.
According to the laser welding method and the laser welding device, the plastic circular pipes and the corresponding tool fixtures do not need to be rotated, the circumference of the welding laser is uniformly irradiated on the inner wall of the butt joint of the two plastic circular pipes only by rotating the reflecting lens, the two layers of plastics at the butt joint are tightly melted together under the action of the pressing plate of the external clamping mechanism, an effective welding line is formed after cooling, and the surface smoothness of the welded plastic circular pipes is also ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic welding diagram of an embodiment of the laser welding apparatus of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
In order to solve the problems of welding strength and appearance of the plastic circular pipes, the invention provides a laser welding method, which is applied to welding between two plastic circular pipes and comprises the following steps:
s10, butting the two plastic circular pipes and enabling the two plastic circular pipes to be in a state to be welded;
and S20, matching a laser welding head which emits welding laser along the axis of the plastic circular tubes with a reflecting lens which can rotate around the axis, so that the welding laser irradiates on the inner wall of the joint of the two plastic circular tubes, thereby welding the two plastic circular tubes together.
The laser welding method is specifically described below with reference to specific examples. Referring to fig. 1, the laser welding method specifically includes the following steps:
and S110, inserting the two plastic circular tubes 1 into each other.
In this embodiment, still include before carrying out the grafting that two need the welding face of 1 weld ends of plastics pipe carry out the step of decontamination treatment, the welding face of a plastics pipe 1 is the medial surface promptly, and the welding face of another plastics pipe 1 is the medial surface, and accessible organic solvent washs the welding face is pegged graft after the washing again so that the welding face of two plastics pipes 1 laminates mutually to improve the fastness after two plastics pipes 1 weld each other. However, this desmear step can be omitted depending on the degree of cleanliness of the plastic round pipe 1 itself, the requirement for welding performance, and the like.
And S120, clamping and fixing the two inserted plastic circular pipes 1 through a clamping mechanism.
In this embodiment, the clamping mechanism includes two opposite pressing plates 2 and a driving cylinder for driving the two pressing plates 2 to approach or separate from each other, and the opposite inner sides of the two pressing plates 2 are cambered surfaces matched with the outer wall of the plastic circular tube 1; after two plastic circular tubes 1 after will pegging graft place between two clamp plates 2, start and drive actuating cylinder so that two clamp plates 2 are close to each other to carry out the centre gripping to the butt joint department of two plastic circular tubes 1.
Preferably, in order to ensure the sealing property of the welded plastic and the smoothness of the surface of the circular tube, the pressure plate 2 is approximately semicircular; two clamp plates 2 wrap up two plastic pipe 1's butt joint department completely after the centre gripping promptly for the centre gripping to two plastic pipe 1 is more reliable, is favorable to the laser welding in later stage simultaneously.
And S130, using a laser welding head 3 which emits welding laser 4 along the axis of the plastic circular tube 1 to match with a reflecting lens 5 which can rotate around the axis, so that the welding laser 4 irradiates on the inner wall of the butt joint of the two plastic circular tubes 1, and welding the two plastic circular tubes 1 together.
In the present embodiment, the mirror plate 5 is mounted on a rotation mechanism, and the rotation of the mirror plate 5 is controlled by the rotation mechanism; preferably, the rotating mechanism includes a rotating bracket for mounting the mirror plate 5, and a driving motor for driving the rotating bracket to rotate. Wherein, the driving motor is a servo motor, and other power sources can be adopted.
In the preferred embodiment, the welding laser 4 emitted by the laser welding head 3 is a continuous light, and the reflecting mirror 5 is obliquely arranged on the axis of the plastic round tube 1 and controlled by the rotating mechanism to rotate at a constant speed around the axis.
So, shine at the inner wall of 1 butt joint department of two plastics pipes (the internal surface of overlap portion promptly) through the lens reflection when welding laser 4, drive 5 at the uniform velocity rotations of speculum through servo motor simultaneously, so that 4 circumferences of welding laser evenly shine on 1 butt joint department inner wall of plastics pipe, thereby effectually weld a week, and under outside fixture's clamp plate 2 effect, make the inseparable melting of two-layer plastics of butt joint department together, form effective welding seam promptly after the cooling, the surfacing of welding back plastics pipe 1 has also been guaranteed.
In addition, the invention also provides a laser welding device which is applied to welding between two circular plastic pipes and mainly comprises a clamping mechanism and a laser welding machine, wherein:
the clamping mechanism is used for clamping and fixing two mutually butted plastic circular tubes 1 and enabling the plastic circular tubes to be in a state to be welded; specifically, fixture includes two relative clamp plates 2 that set up and drive the actuating cylinder that drives two clamp plates 2 and be close to each other or keep away from, and the relative inboard of two clamp plates 2 is the cambered surface with 1 outer wall looks adaptation of plastics pipe.
In order to ensure the sealing property of the welded plastic and the smoothness of the surface of the circular tube, the pressure plate 2 is approximately semicircular; two clamp plates 2 wrap up two plastic pipe 1's butt joint department completely after the centre gripping promptly for the centre gripping to two plastic pipe 1 is more reliable, is favorable to the laser welding in later stage simultaneously.
It should be noted that, in this embodiment, the two driving cylinders of the clamping mechanism are respectively connected to the two pressing plates 2, and during clamping, the two driving cylinders are synchronously started, so as to control the two pressing plates 2 to approach each other to clamp and fix the plastic circular tubes 1 that are inserted into each other, and the axes of the plastic circular tubes 1 that are clamped and fixed are on the same straight line with the welding laser 4 emitted by the laser welding machine.
Of course, in other embodiments, only one driving cylinder may be needed, that is, one pressing plate is fixedly disposed relative to the laser welding machine, the central axis of the inner side surface of the fixed pressing plate is aligned with the welding laser 4 emitted by the laser welding machine, the driving cylinder is connected to the other pressing plate, the driving cylinder drives the connected pressing plate to approach the direction of the fixed pressing plate so as to clamp and fix the plastic circular tubes 1 that are inserted into each other, and at this time, the axis of the plastic circular tube 1 clamped and fixed is aligned with the welding laser 4 emitted by the laser welding machine.
The laser welding machine is provided with a laser welding head 3 which emits welding laser 4 along the axis of the plastic circular tube 1, a reflecting lens 5 which is arranged on the axis in an inclined mode and used for reflecting the welding laser 4 to the inner wall of the joint of the two plastic circular tubes 1, and a rotating mechanism which drives the reflecting lens 5 to rotate around the axis, so that the welding laser 4 can complete welding work in the rotating process of the reflecting lens.
In the present embodiment, the rotation mechanism includes a rotation bracket for mounting the mirror plate 5, and a drive motor for driving the rotation bracket to rotate. Preferably, the driving motor is a servo motor, but other power sources can be adopted. It is rotatory through driving motor drive runing rest, can drive the reflector plate 5 and rotate around the fixed 1 axes of plastics pipe of centre gripping, thereby the welding laser 4 that sends laser welder head 3 reflects the inner wall to 1 butt joint of two plastics pipes (the internal surface of overlap portion promptly), after 5 rotatory a week of reflector plate, welding laser 4 can accomplish and weld a week to 1 overlap portion of two plastics pipes, and under outside fixture's clamp plate 2 effect, make the inseparable melting of two-layer plastics of butt joint together, form effective welding seam after the cooling, the surfacing of welding back plastics pipe 1 has also been guaranteed.
Further, a pitching adjusting component is arranged between the reflector 5 and the rotating bracket, and before welding is started, the pitching angle of the reflector 5 can be adjusted through the pitching adjusting component, so that the welding laser 4 can be reflected to the inner wall of the butt joint of the plastic circular tube 1; it should be noted that the laser welding machine may also be integrally disposed on a moving mechanism, and the moving mechanism may drive the laser welding machine to move along the axial direction of the circular plastic tube 1 to adjust the approximate falling point of the welding laser 4.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the technical solutions provided by the present invention, those skilled in the art will recognize that there may be variations in the technical solutions and the application ranges according to the concepts of the embodiments of the present invention, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. A laser welding method is applied to welding between two circular plastic pipes and is characterized by comprising the following steps:
s10, butting the two plastic circular pipes and enabling the two plastic circular pipes to be in a state to be welded;
and S20, matching a laser welding head which emits welding laser along the axis of the circular plastic pipes with a reflecting lens which can rotate around the axis, so that the welding laser irradiates on the inner wall of the butt joint of the two circular plastic pipes, and the two circular plastic pipes are welded together.
2. The laser welding method according to claim 1, wherein the step S10 specifically includes a step of inserting the two circular plastic tubes into each other, and a step of clamping and fixing the two inserted circular plastic tubes by a clamping mechanism.
3. The laser welding method according to claim 2, wherein the step S10 is preceded by a step of performing a desmear treatment on the welding surface of the two circular plastic pipes when they are inserted into each other.
4. The laser welding method according to claim 2, wherein the clamping mechanism comprises two opposite pressing plates and a driving cylinder for driving the two pressing plates to approach or separate from each other, and the opposite inner sides of the two pressing plates are cambered surfaces matched with the outer wall of the plastic circular tube;
the step of clamping and fixing the two plastic circular tubes specifically comprises the step of starting the driving cylinder to enable the two pressing plates to be close to each other so as to clamp the butt joint of the two plastic circular tubes.
5. The laser welding method as claimed in claim 1, wherein in step S20, the welding laser emitted from the laser welding head is a continuous light, and the mirror is disposed on an axis of the circular plastic tube and is tilted and rotated at a constant speed around the axis.
6. A laser welding device is applied to welding between two plastic circular pipes, and is characterized by comprising:
the clamping mechanism is used for clamping and fixing two mutually butted plastic circular pipes and enabling the two mutually butted plastic circular pipes to be in a state to be welded;
the laser welding machine is provided with a laser welding head which emits welding laser along the axis of the plastic circular tubes, a reflecting lens which is arranged on the axis in an inclined mode and used for reflecting the welding laser to the inner wall of the joint of the two plastic circular tubes, and a rotating mechanism which drives the reflecting lens to rotate around the axis, so that the welding laser can complete welding work in the rotating process of the reflecting lens.
7. The laser welding device according to claim 6, wherein the clamping mechanism comprises two opposite pressing plates and a driving cylinder for driving the two pressing plates to approach or separate from each other, and the opposite inner sides of the two pressing plates are cambered surfaces matched with the outer wall of the plastic circular tube.
8. The laser welding apparatus of claim 7, wherein the platen is a semi-circular structure.
9. The laser welding apparatus according to claim 6, wherein the rotating mechanism includes a rotating bracket for mounting the mirror plate, and a driving motor for driving the rotating bracket to rotate.
10. The laser welding apparatus as recited in claim 9, wherein a pitch adjustment assembly is further disposed between the mirror plate and the rotatable frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383990.3A CN114571737A (en) | 2020-12-01 | 2020-12-01 | Laser welding method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383990.3A CN114571737A (en) | 2020-12-01 | 2020-12-01 | Laser welding method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114571737A true CN114571737A (en) | 2022-06-03 |
Family
ID=81767029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011383990.3A Withdrawn CN114571737A (en) | 2020-12-01 | 2020-12-01 | Laser welding method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114571737A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4367017A (en) * | 1979-09-28 | 1983-01-04 | Hitachi, Ltd. | Laser beam reflection system |
| JPS6238787A (en) * | 1985-08-13 | 1987-02-19 | Mitsui Eng & Shipbuild Co Ltd | Inner bore welding method |
| CN107932919A (en) * | 2017-12-19 | 2018-04-20 | 长春亚大汽车零件制造有限公司 | A kind of laser welding apparatus of tubular structure |
-
2020
- 2020-12-01 CN CN202011383990.3A patent/CN114571737A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4367017A (en) * | 1979-09-28 | 1983-01-04 | Hitachi, Ltd. | Laser beam reflection system |
| JPS6238787A (en) * | 1985-08-13 | 1987-02-19 | Mitsui Eng & Shipbuild Co Ltd | Inner bore welding method |
| CN107932919A (en) * | 2017-12-19 | 2018-04-20 | 长春亚大汽车零件制造有限公司 | A kind of laser welding apparatus of tubular structure |
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Application publication date: 20220603 |