CN110154401B - Plastic shape correction laser welding process - Google Patents
Plastic shape correction laser welding process Download PDFInfo
- Publication number
- CN110154401B CN110154401B CN201910501787.2A CN201910501787A CN110154401B CN 110154401 B CN110154401 B CN 110154401B CN 201910501787 A CN201910501787 A CN 201910501787A CN 110154401 B CN110154401 B CN 110154401B
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- China
- Prior art keywords
- welding
- parts
- laser
- friction
- plastic
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Classifications
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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
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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
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1632—Laser beams characterised by the way of heating the interface direct heating the surfaces to be joined
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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
- B29C65/78—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
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
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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
- B29C65/78—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
- B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
- B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
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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
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of plastic welding, in particular to a plastic shape correction laser welding process, which comprises the steps of firstly, fully or partially contacting welding surfaces of two welding parts under certain pressure, correcting the shapes of the two welding parts, enabling the shapes of the two welding parts to be the same as the shapes of finished products except for a gap between the two welding parts after correction, then carrying out vibration friction on the welding surfaces at the frequency of vibration friction welding, reducing the gap between the welding surfaces between the two welding parts to be within a required range, enabling the partial or all welding surfaces to be reliably connected, and then carrying out laser welding on the welding surfaces by using a laser. The laser welding can be conveniently carried out, and the welding process can not be deformed.
Description
Technical Field
The invention relates to the technical field of plastic welding, in particular to a plastic shape correction laser welding process.
Background
Plastic is a material with good processability, and with the rapid development of high polymer materials, more and more products and parts are produced by adopting plastic, so that the plastic is widely applied, and correspondingly, the plastic welding technology is also widely applied.
At present, the plastic welding uses more ultrasonic welding, friction welding, vibration welding, laser welding, induction welding, high-frequency welding, hot air welding, hot plate welding and the like, and has advantages and defects. The laser welding has the advantages of non-contact, high efficiency, high precision, attractive welding line, good sealing performance and the like, resin degradation is less, scraps are less in the welding process, compared with other welding methods, the vibration stress and the thermal stress of a product are greatly reduced, the product with a complex appearance is adept to be welded, areas which are difficult to reach by other methods can be welded, the control is easy, the adaptability is good, and the development trend of plastic welding is gradually reached.
However, the requirement of laser welding on the dimensional accuracy of a welded part is high, and the dimensional error is generally required to be within 0.2mm, but in the forming process of plastics, due to reasons such as forming process, die and structural design, raw materials and machines, large dimensional error and even certain deformation may be generated on a welding surface, so that the product cannot be directly subjected to laser welding, the surface quality of part of the welding surface may not meet the requirement, and the laser welding is also hindered.
Disclosure of Invention
The invention aims to provide a plastic shape correction laser welding process aiming at the defects of the prior art, which is characterized in that the size precision and the shape of a welding part meet the requirements by preprocessing a welding surface, and then laser welding is carried out, so that the welding quality and the welding efficiency are improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a plastic shape correction laser welding process comprises the steps of firstly, fully or partially contacting welding faces of two welding parts under certain pressure, correcting shapes of the two welding parts, after correction, enabling the shapes of the two welding parts to be the same as those of a finished product except for a gap between the two welding parts, then carrying out vibration friction cutting on the welding faces at the frequency of vibration friction welding, enabling the welding faces which are contacted firstly to be cut and melted to be extruded out through the friction cutting, gradually reducing the gap between the two welding parts to a required range, enabling the partial or all welding faces to be reliably connected, and then carrying out laser welding on the welding faces by using a laser.
Preferably, the welding face is provided with a plurality of welding point, the welding point protrusion in the welding face, after the vibration friction welding, two welding piece pass through this welding point fixed connection.
Preferably, the welding point is 0.5mm higher than the welding surface.
Preferably, after the vibration friction welding, the clearance between all welding surfaces of the two welding parts is less than 0.2-0.3 mm.
Preferably, the two weldment are clamped using a die or clamp, respectively, which provides each weldment with a compressive force against the other weldment.
Preferably, the welding device is provided with a shape detection device for detecting whether the corrected shapes of the two welding parts are the same as the shape of the finished product, and the die or the clamp is provided with a plurality of pressure points for adjusting the pressure according to the corrected shapes of the two welding parts.
Preferably, the amplitude is 0.5mm to 1.2mm when the friction is vibrated.
Preferably, the vibration friction is linear electromagnetic vibration friction, track type electromagnetic vibration friction, mechanical track type vibration friction or tracking type friction welding.
The invention has the beneficial effects that: a laser welding technology for correcting the shape of plastic includes such steps as fully or partially contacting the welding surfaces of two welded parts under a certain pressure, correcting the shapes of two welded parts, vibrating the welding surfaces at the frequency of vibration friction welding to reduce the gap between two welded parts to a required range, connecting part or all of the welding surfaces reliably, and laser welding, and the welding process does not deform.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited thereto.
The plastic correction laser welding process of the embodiment comprises the steps of firstly, fully or partially contacting the welding surfaces of two welding parts under certain pressure, correcting the shapes of the two welding parts, after correction, enabling the shapes of the two welding parts to be the same as the shapes of finished products except for the gap between the two welding parts, then, carrying out vibration friction cutting on the welding surfaces at the frequency of vibration friction welding, enabling the welding surfaces which are firstly contacted to be cut, melted and extruded out by friction cutting, gradually reducing the gap between the two welding parts to a required range, enabling the partial or all welding surfaces to be reliably connected, and then, carrying out laser welding on the welding surfaces by using a laser device. After vibration and friction, the two welding parts are connected relatively firmly, so that laser welding is facilitated, and the welding process cannot deform.
Further, the vibration friction may be linear electromagnetic vibration friction, tracking electromagnetic vibration friction, mechanical tracking vibration friction, or tracking friction welding, or may not be limited to these several types.
The technical scheme needs to adjust certain process parameters during vibration friction, and specifically comprises the following steps: during vibration friction, the amplitude is 0.5mm-1.2mm, the pressure is 50-1000 kg, and the welding depth is 0.2mm-1.0 mm. When the friction welding is carried out, the welding amplitude is small, so that dust is prevented from being generated; the surface is subjected to friction cutting through vibration friction, and the uneven part of the welding surface is subjected to shape correction treatment, so that the welding surface can be well matched, and laser welding is facilitated; and when friction welding is carried out, the welding depth is shallow, and the two welding parts can be bonded preliminarily. The invention corrects the deformation of the welding part during injection molding in a standard mold cavity under the condition that the welding product is pressed, and performs primary bonding, the welding part is basically bonded after vibration and friction, the welding is not firm, but the whole three-dimensional size is fixed, so that the product is convenient for laser welding. The welding face causes welding contact surface to be greater than the welding face contact gap that laser plastics welding required owing to mould plastics or mould or other reasons, and the welding face contact surface is level and smooth inadequately, and after the vibration friction welding, the laminating is realized to two welding part or whole welding faces, has partly welded, but intensity is less than the welding requirement.
In order to fix the welding parts and clamp the welding parts during vibration friction, the invention respectively uses a mould or a clamp to clamp the two welding parts, the mould or the clamp provides pressing force for each welding part to the other welding part, and the welding parts are required to be prevented from being deformed due to uneven pressing force, so that a better mode is that a plurality of welding points are arranged on the welding surfaces, the welding points protrude out of the welding surfaces, after the vibration friction welding, the two welding parts are fixedly connected through the welding points, preferably, the welding points are 0.5mm higher than the welding surfaces, and after the vibration friction welding, the height of the welding points is reduced to be level with or slightly higher than the other welding surfaces.
After vibration friction welding, the clearance between all welding surfaces of the two welding parts is less than 0.2-0.3mm, preferably 0-0.1 mm.
The welding device is provided with a shape detection device for detecting whether the corrected shapes of the two welding parts are the same as the shape of a finished product, the die or the clamp is provided with a plurality of pressure points for adjusting the pressure according to the corrected shapes of the two welding parts, and whether the pressure of the pressure points needs to be adjusted can be determined through the detection device, so that the product deforms to meet the requirement under the pressure. Meanwhile, the shape detection device is also used for checking whether the product is qualified or not. The pressure of the pressure point should be set to a certain limit, so that the welding part is prevented from being damaged due to overlarge pressure.
According to the technical scheme, the method is different from the method for directly performing vibration friction welding on the welding parts, the welding surface is processed in a vibration friction mode, the shapes of the welding parts are adjusted, and the welding parts are locally connected and formed after vibration friction, so that the shapes of products during laser welding are ensured, and the products are prevented from deforming.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The plastic shape correction laser welding process is characterized in that: the method comprises the steps of firstly, fully or partially contacting welding surfaces of two welding parts under certain pressure, correcting the shapes of the two welding parts, enabling the shapes of the two welding parts to be the same as the shape of a finished product except for a gap between the two welding parts after correction, then carrying out vibration friction cutting on the welding surfaces by vibration friction welding, enabling the welding surfaces which are contacted firstly to be cut, melted and extruded by the friction cutting, gradually reducing the gap between the two welding parts to be within a required range, enabling the partial or all welding surfaces to be reliably connected, and then carrying out laser welding on the welding surfaces by using a laser.
2. The plastic sizing laser welding process of claim 1, wherein: the welding surface is provided with a plurality of welding points, the welding points protrude out of the welding surface, and after vibration friction welding, the two welding parts are fixedly connected through the welding points.
3. The plastic sizing laser welding process of claim 2, wherein: the welding point is higher than the welding surface by more than 0.5 mm.
4. The plastic sizing laser welding process of claim 1, wherein: after vibration friction welding, the clearance between all welding surfaces of the two welding parts is less than 0.2-0.3 mm.
5. The plastic sizing laser welding process of claim 1, wherein: the two weldment are clamped using a die or clamp, respectively, which provides each weldment with compressive force against the other.
6. The plastic sizing laser welding process of claim 5, wherein: the welding device is provided with a shape detection device for detecting whether the corrected shapes of the two welding parts are the same as the shape of a finished product, and the die or the clamp is provided with a plurality of pressure points for adjusting pressure according to the corrected shapes of the two welding parts.
7. The plastic sizing laser welding process of claim 1, wherein: the amplitude is 0.5mm-1.2mm during vibration and friction.
8. The plastic sizing laser welding process of claim 1, wherein: the vibration friction is linear electromagnetic vibration friction or tracking friction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910501787.2A CN110154401B (en) | 2019-06-11 | 2019-06-11 | Plastic shape correction laser welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910501787.2A CN110154401B (en) | 2019-06-11 | 2019-06-11 | Plastic shape correction laser welding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110154401A CN110154401A (en) | 2019-08-23 |
| CN110154401B true CN110154401B (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910501787.2A Active CN110154401B (en) | 2019-06-11 | 2019-06-11 | Plastic shape correction laser welding process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107414291A (en) * | 2016-05-05 | 2017-12-01 | 香港理工大学 | Ultrasonic wave added laser welding foreign material |
| DE102017128398B3 (en) * | 2017-11-30 | 2019-05-23 | Ernst-Abbe-Hochschule Jena | Method and device for welding at least two films by means of laser |
| JP2019084767A (en) * | 2017-11-08 | 2019-06-06 | 日産自動車株式会社 | Joining method of member to be joined |
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2019
- 2019-06-11 CN CN201910501787.2A patent/CN110154401B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107414291A (en) * | 2016-05-05 | 2017-12-01 | 香港理工大学 | Ultrasonic wave added laser welding foreign material |
| JP2019084767A (en) * | 2017-11-08 | 2019-06-06 | 日産自動車株式会社 | Joining method of member to be joined |
| DE102017128398B3 (en) * | 2017-11-30 | 2019-05-23 | Ernst-Abbe-Hochschule Jena | Method and device for welding at least two films by means of laser |
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| Publication number | Publication date |
|---|---|
| CN110154401A (en) | 2019-08-23 |
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Effective date of registration: 20230614 Address after: 441400 Qili Village, Leihe Development Park, Yicheng city, Xiangyang City, Hubei Province Patentee after: Hubei xindingtai Automation Technology Co.,Ltd. Address before: 441400 Yicheng Economic Development Zone, Xiangyang City, Hubei Province Patentee before: HUBEI LONGQING TECHNOLOGY Co.,Ltd. |