CN111086221A - Laser welding control system and method - Google Patents
Laser welding control system and method Download PDFInfo
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- CN111086221A CN111086221A CN202010196331.2A CN202010196331A CN111086221A CN 111086221 A CN111086221 A CN 111086221A CN 202010196331 A CN202010196331 A CN 202010196331A CN 111086221 A CN111086221 A CN 111086221A
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- controller
- welding
- laser generator
- laser
- height change
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/87—Auxiliary operations or devices
- B29C66/874—Safety measures or devices
- B29C66/8748—Safety measures or devices involving the use of warnings
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
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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
- B29C66/90—Measuring or controlling the joining process
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
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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)
Abstract
The invention relates to a laser welding control system and a laser welding control method, wherein the system comprises a controller, a jig, a laser generator, a welding head and a displacement sensor, the jig is used for fixing a product to be welded, a sensor contact of the displacement sensor is in contact with the jig, the displacement sensor is used for detecting a height change value of the jig in a welding process, and the laser generator is used for welding the product to be welded through the welding head; the controller is used for acquiring height change value detection data of the displacement sensor, comparing the height change value detection data with a preset height change value threshold value, and controlling the laser generator to stop welding when the height change value detection data reaches the preset height change value threshold value. The system and the method improve the quality risk of the product in the welding process, improve the welding qualification rate of the product and reduce the manual detection cost.
Description
Technical Field
The invention relates to the technical field of laser welding, in particular to a laser welding control system and method.
Background
In the traditional plastic welding, the most common are gluing, ultrasonic wave, vibration friction and hot plate welding, and laser welding is used as a novel welding mode and starts to enter the market of industrial application.
In the development process of laser plastic welding, the laser plastic welding is influenced by environmental protection, attracts the favor of most people, and firstly, the laser welding principle is introduced.
The principle of laser welding is as follows: when two plastic parts are welded by using a laser welding technology, the parts are clamped together firstly, then near infrared laser with the wavelength of 810-1064 nm is transmitted through a first part, the laser is absorbed by a second part after being transmitted, the absorbed near infrared laser is converted into heat energy, and the contact surfaces of the two parts are melted to form a welding area.
The laser welding is adopted, non-contact welding is adopted, the surface of a welded product workpiece cannot be scratched by pressing marks, and in the welding process, no noise pollution and no pollution of toxic gas exist.
The use of laser plastic welding technology has already begun to be applied in the industrial field, in the welding process of whole product, often meet the product and be opaque material, after the product welding is accomplished, whether laser generator has sent laser during the welding, or whether the laser that sends is unanimous with the setting value, whether the product welds firmly, whether the product has the condition that laser did not send in the welding process, can't discern this moment and make the judgement, this kind of condition has the risk of product welded quality good or bad. Therefore, based on this situation, there is a need for further improvements in laser plastic welding.
Disclosure of Invention
The invention aims to improve the quality risk of a product in the welding process, improve the welding qualification rate of the product and reduce the manual detection cost.
In order to achieve the above object, the present invention has the following configurations:
the laser welding control system comprises a controller, a jig, a laser generator, a welding head and a displacement sensor, wherein the jig is used for fixing a product to be welded, a sensor contact of the displacement sensor is in contact with the jig, the displacement sensor is used for detecting a height change value of the jig in a welding process, and the laser generator is used for welding the product to be welded through the welding head;
the controller is used for acquiring height change value detection data of the displacement sensor, comparing the height change value detection data with a preset height change value threshold value, and controlling the laser generator to stop welding when the height change value detection data reaches the preset height change value threshold value.
Optionally, the controller is further configured to obtain an actual output power of the laser generator, compare the actual output power with a control power sent to the laser generator by the controller, and determine that the laser generator is abnormal if the deviation value is greater than a preset deviation value threshold.
Optionally, the system further comprises a warning lamp, and the controller gives an alarm through the warning lamp when the controller determines that the laser generator works abnormally.
Optionally, the system further comprises a display screen for displaying the actual output power of the laser generator.
Optionally, the controller is further configured to obtain an identification number of a product to be welded, and display the identification number through the display screen.
Optionally, the controller controls the actual output power of the laser generator via a PC control system.
The embodiment of the invention also provides a laser welding control method, which adopts the laser welding control system and comprises the following steps:
the controller sends control power to the laser generator;
the laser generator controls the welding head to weld the product to be welded according to the control power;
the displacement sensor detects a height change value of the jig in the welding process and sends the height change value to the controller;
and the controller compares the height change value detection data with a preset height change value threshold, and when the height change value detection data reaches the preset height change value threshold, the controller controls the laser generator to stop welding.
Optionally, the method further comprises the steps of:
the controller acquires actual output power of the laser generator;
and the controller compares the actual output power with the control power sent to the laser generator by the controller, and if the deviation value is greater than a preset deviation value threshold value, the controller judges that the laser generator works abnormally.
Optionally, the system further comprises a display screen, and the method further comprises the following steps:
and the controller displays the actual output power of the laser generator through the display screen.
Optionally, the controller obtains an identification number of a product to be welded, and displays the identification number through the display screen.
By adopting the laser welding control system and method provided by the invention, the following beneficial effects are achieved:
by adopting the invention, in the product welding process, the jig displacement change is gradually increased in the welding process, along with the displacement change of the product welding jig, when the displacement sensor detects that the jig displacement change is consistent with the preset fusion depth, the welding action of the product is terminated, otherwise, the product welding is continued, and the jig displacement change is the height change value of the jig, namely the actual fusion depth; the penetration control system plays an important role in controlling the product quality, and improves the qualified rate of the product welding quality; furthermore, the stability of the actual output power of the laser generator is judged by feeding back the actual power of the laser generator, the deviation between the actual power and the input power is too large, an alarm prompt is given, and the fed back actual power is displayed on the touch screen, so that the traceability can be realized on the identification of products.
Drawings
FIG. 1 is a schematic diagram of a laser welding control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an on-line laser power monitoring power display according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a laser plastic welding penetration control mode according to an embodiment of the invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
As shown in fig. 1 to 3, in order to solve the technical problems in the prior art, the invention provides a laser welding control system, which includes a controller, a jig, a laser generator, a welding head and a displacement sensor. The jig is used for fixing a product to be welded and has a continuous clamping force on the product to be welded. And the laser generator is used for welding the product to be welded through the welding head. In this embodiment, the controller is a PLC controller.
In this embodiment, the controller controls the actual output power of the laser generator through a PC control system. The PC control system mainly controls laser power input, operation of a welding head and fixing and clamping effects of the welding jig on a product to be welded. Specifically, the PC control system controls the laser generator to emit laser through the PLC, the laser passes through the welding head through optical fiber transmission, and the laser beam passes through the welding head to be focused and then reaches the upper surface of a product to be welded. The laser beam is rapidly welded along the outline of the product to be welded, the plastic of the light-absorbing part at the lower layer of the product to be welded can rapidly reach a molten state under the influence of laser heat, and is mutually fused with the workpiece at the upper layer of the product to be welded through the clamping force of an external jig, and an effective welding line is formed after cooling. In the welding seam forming process, the depth displacement sensor above the jig detects the displacement change of the jig. The displacement sensor is mainly used for detecting the product penetration in the welding process of the welding jig. Specifically, the sensor contact of displacement sensor with the tool contacts, displacement sensor is used for detecting the height variation value of welding in-process the tool.
The controller is used for acquiring height change value detection data of the displacement sensor, comparing the height change value detection data with a preset height change value threshold value, and controlling the laser generator to stop welding when the height change value detection data reaches the preset height change value threshold value. Therefore, the displacement sensor detects that the jig displacement changes to reach a set value, and feeds back the jig displacement to the PLC early warning signal to terminate the PC control system starting signal, wherein the jig displacement is the height change value of the jig, namely the actual fusion depth change. The PLC controller can preset a required welding penetration value, namely a height change value threshold value before welding, and different threshold values can be set for different types of products. The penetration control system plays an important role in controlling the product quality, and improves the qualified rate of the product welding quality.
In this embodiment, the laser generator is a semiconductor laser generator, but is also applicable to fiber laser generators and other solid state laser generators.
As shown in fig. 2, in this embodiment, the PC control system sets the input power value, and controls the output of the laser generator power through the PLC controller. The controller is further used for obtaining the actual output power of the laser generator, comparing the actual output power with the control power sent to the laser generator by the controller, and if the deviation value is larger than a preset deviation value threshold value, judging that the laser generator works abnormally by the controller.
In this embodiment, the system further includes a warning lamp, and the controller gives an alarm by the warning lamp when determining that the laser generator is abnormal. The alarm lamp is mainly used for warning the running state of the equipment, and gives an alarm for the stability of the power output state of the laser generator in the whole control system.
In one embodiment, during the power output of the laser generator, the internal power Pd of the laser generator is fed back to the PLC controller to identify whether the laser generator emits laser light and whether the emitted laser power is within an allowable error range, and the actual power is input to the display screen. The error between the actual power value and the input power value is equal to the ratio of the absolute value of the difference between the actual power value and the input power value to the input power value, namely | the actual power value-the input power value | and the input power value, and the error of the laser generator is judged to be wrong according to the error between the actual power value and the input power value being more than 3 percent, and the alarm lamp red light prompt is given; and judging that the stability of the laser generator is normal by using the error between the actual power value and the input power value to be less than or equal to 3 percent, and giving a green light prompt of an alarm lamp. The alarm prompt can assist in judging the stability of the power output of the laser generator.
In this embodiment, the system further comprises a display screen for displaying the actual output power of the laser generator. In this embodiment, the controller is further configured to obtain an identification number of a product to be welded, display the identification number through the display screen, and monitor and display actual output power on the touch screen on line, so as to ensure power stability and traceability of product welding.
The online power stability laser plastic welding control system can avoid the condition that the power of a product is lost or insufficient in the welding process, and further ensures the welding quality of the product. The power attenuation of the laser generator caused by the long-time working process of the laser generator plays a certain role in supervision, and the power of the laser generator can be adjusted in time.
The embodiment of the invention also provides a laser welding control method, which adopts the laser welding control system and comprises the following steps:
the controller sends control power to the laser generator;
the laser generator controls the welding head to weld the product to be welded according to the control power;
the displacement sensor detects a height change value of the jig in the welding process and sends the height change value to the controller;
and the controller compares the height change value detection data with a preset height change value threshold, and when the height change value detection data reaches the preset height change value threshold, the controller controls the laser generator to stop welding.
In this embodiment, the method further comprises the steps of:
the controller acquires actual output power of the laser generator;
and the controller compares the actual output power with the control power sent to the laser generator by the controller, and if the deviation value is greater than a preset deviation value threshold value, the controller judges that the laser generator works abnormally.
In this embodiment, the system further comprises a display screen, and the method further comprises the steps of:
and the controller displays the actual output power of the laser generator through the display screen.
In this embodiment, the controller acquires an identification number of a product to be welded, and displays the identification number through the display screen.
In the laser welding control method, the specific implementation manner of each step may adopt a specific implementation manner of the function implementation of each functional module of the laser welding control system, which is not described herein again.
By adopting the laser welding control system and method provided by the invention, the following beneficial effects are achieved:
by adopting the invention, in the product welding process, along with the displacement change of the product welding jig, when the displacement sensor detects that the jig displacement change is consistent with the preset fusion depth, the welding effect of the product is stopped, otherwise, the product welding is continued; the penetration control system plays an important role in controlling the product quality, and improves the qualified rate of the product welding quality; furthermore, the stability of the actual output power of the laser generator is judged by feeding back the actual power of the laser generator, the deviation between the actual power and the input power is too large, an alarm prompt is given, and the fed back actual power is displayed on the touch screen, so that the traceability can be realized on the identification of products.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (7)
1. A laser welding control system is characterized by comprising a controller, a jig, a laser generator, a welding head and a displacement sensor, wherein the jig is used for fixing a product to be welded, a sensor contact of the displacement sensor is in contact with the jig, the displacement sensor is used for detecting a height change value of the jig in a welding process, and the laser generator is used for welding the product to be welded through the welding head;
the controller is used for acquiring height change value detection data of the displacement sensor, comparing the height change value detection data with a preset height change value threshold value, and controlling the laser generator to stop welding when the height change value detection data reaches the preset height change value threshold value;
the controller is further used for obtaining the actual output power of the laser generator, comparing the actual output power with the control power sent to the laser generator by the controller, and if the deviation value is larger than a preset deviation value threshold value, judging that the laser generator works abnormally by the controller;
the system further comprises an alarm lamp, and when the controller judges that the laser generator works abnormally, the alarm lamp gives an alarm.
2. The laser welding control system of claim 1, further comprising a display screen for displaying an actual output power of the laser generator.
3. The laser welding control system according to claim 2, wherein the controller is further configured to acquire an identification number of a product to be welded and display the identification number through the display screen.
4. The laser welding control system of claim 1, wherein the controller controls the actual output power of the laser generator via a PC control system.
5. A laser welding control method characterized by employing the laser welding control system of any one of claims 1 to 4, the method comprising the steps of:
the controller sends control power to the laser generator;
the laser generator controls the welding head to weld the product to be welded according to the control power;
the displacement sensor detects a height change value of the jig in the welding process and sends the height change value to the controller;
the controller compares the height change value detection data with a preset height change value threshold, and when the height change value detection data reaches the preset height change value threshold, the controller controls the laser generator to stop welding;
the method further comprises the steps of:
the controller acquires actual output power of the laser generator;
the controller compares the actual output power with the control power sent to the laser generator by the controller, and if the deviation value is larger than a preset deviation value threshold value, the controller judges that the laser generator works abnormally;
the system further comprises an alarm lamp, and when the controller judges that the laser generator works abnormally, the alarm lamp gives an alarm.
6. The laser welding control method according to claim 5, wherein the system further includes a display screen, the method further comprising the steps of:
and the controller displays the actual output power of the laser generator through the display screen.
7. The laser welding control method according to claim 6, wherein the controller acquires an identification number of a product to be welded and displays the identification number through the display screen.
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| CN202010196331.2A CN111086221A (en) | 2020-03-19 | 2020-03-19 | Laser welding control system and method |
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| CN202010196331.2A CN111086221A (en) | 2020-03-19 | 2020-03-19 | Laser welding control system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523552A (en) * | 2021-08-03 | 2021-10-22 | 电子科技大学 | Laser welding equipment suitable for long-line welding and laser energy control method |
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| CN113523552A (en) * | 2021-08-03 | 2021-10-22 | 电子科技大学 | Laser welding equipment suitable for long-line welding and laser energy control method |
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