A fiber laser assembly line two-dimensional code marking method and system

Abstract

The present invention discloses a fiber laser assembly line two-dimensional code marking method and system, wherein the method comprises: taking out a workpiece from a die-casting mold by a manipulator and transporting it to a two-dimensional code marking position; wherein the workpiece comprises a marking area corresponding to the two-dimensional code marking position, and the marking area comprises marking sub-areas divided by the size of two-dimensional code pixels; controlling an infrared thermometer to collect the temperature of each marking sub-area respectively, and selecting the highest temperature in each marking sub-area as a standard temperature; according to the standard temperature, controlling a fiber laser to preheat each marking sub-area with a first power so that the temperature difference between each marking sub-area does not exceed the standard temperature difference; after preheating is completed, according to the standard temperature, controlling a fiber laser to perform two-dimensional code marking on the marking area of ​​the workpiece with a second power. The present invention can make the two-dimensional code marking uniform and ensure the accuracy of two-dimensional code recognition.

Description

Technical Field

[0001] The present invention relates to the field of laser marking, and in particular to a fiber laser assembly line two-dimensional code marking method and system. Background Art

[0002] Two-dimensional barcodes are black and white graphics that record data symbol information and are distributed in a plane (two-dimensional direction) according to a certain geometric pattern. Two-dimensional codes can mark workpieces and store information.

[0003] The prior art usually directly pastes the QR code on the die-cast workpiece, but the pasting is easily affected by time and environment, resulting in a decrease in the adhesion and the QR code falling off. Without the QR code, it is difficult to effectively identify the die-cast workpiece. There are few methods in the prior art that can permanently fix the QR code on the die-cast workpiece. Summary of the invention

[0004] When the applicant performs QR code laser marking on a metal workpiece, the metal workpiece is often taken out of the die-casting mold and the cooling speed of each area is different, resulting in different temperatures in the marking area of ​​the same metal workpiece, which leads to QR codes of different depths during laser marking. QR codes of different depths are difficult to identify.

[0005] In view of some of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a fiber laser assembly line two-dimensional code marking method and system, aiming to make the two-dimensional code marking uniform and ensure the accuracy of two-dimensional code recognition.

[0006] To achieve the above object, the first aspect of the present invention provides a fiber laser assembly line two-dimensional code marking method, the method comprising:

[0007] The workpiece is taken out from the die-casting mold by a manipulator and transported to a two-dimensional code marking position; wherein the workpiece includes a marking area corresponding to the two-dimensional code marking position, and the marking area includes marking sub-areas divided according to the size of two-dimensional code pixels;

[0008] Controlling the infrared thermometer to collect the temperature of each of the marking sub-areas respectively, and selecting the highest temperature in each of the marking sub-areas as the standard temperature;

[0009] According to the standard temperature, controlling the fiber laser to preheat each of the marking sub-areas at a first power so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference; wherein the laser of the first power will only heat the marking sub-areas but will not melt the marking sub-areas;

[0010] After preheating is completed, the fiber laser is controlled to perform two-dimensional code marking on the marking area of ​​the workpiece at a second power according to the standard temperature; wherein, the higher the standard temperature, the lower the second power, and the second power is greater than the first power.

[0011] Optionally, the method further includes:

[0012] The fan is controlled to blow air to the QR code marking position to remove water vapor generated by cooling the die-casting mold.

[0013] Optionally, the method further includes:

[0014] In response to the temperature of the fiber laser reaching an extreme temperature, a mobile air cooler is controlled to cool the fiber laser; wherein the extreme temperature is obtained according to an overheat shutdown temperature of the fiber laser.

[0015] Optionally, after controlling the fiber laser to preheat each of the marking sub-areas at a first power according to the standard temperature so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference, the method further includes:

[0016] The marking area is subjected to a heat preservation treatment so that the temperature change of each marking sub-area after preheating is lower than a preset change range.

[0017] Optionally, controlling the fiber laser to preheat each of the marking sub-areas at a first power according to the standard temperature includes:

[0018] According to the temperature difference between the standard temperature and each of the marking sub-areas, obtaining the first power of the fiber laser and the preheating time for each of the marking sub-areas;

[0019] The fiber laser is controlled to preheat each of the marking sub-areas at the first power for the corresponding preheating time.

[0020] Optionally, controlling the fiber laser to mark the marking area of ​​the workpiece with a second power according to the standard temperature includes:

[0021] According to the standard temperature, obtaining the second power of the fiber laser;

[0022] The fiber laser is controlled to perform two-dimensional code marking on the marking area of ​​the workpiece at the second power; wherein the marking order of the fiber laser on each of the marking sub-areas is the same as the preheating order.

[0023] Optionally, the two-dimensional code corresponds to a storage space, and the storage space receives and stores each process flow information of the workpiece after marking.

[0024] The second aspect of the present invention discloses a fiber laser assembly line two-dimensional code marking system, the system comprising: a manipulator, an infrared thermometer and a fiber laser arranged relative to a two-dimensional code marking position, and a main control MCU; the main control MCU is respectively connected to the manipulator, the infrared thermometer, and the fiber laser for communication;

[0025] The manipulator is used to transport the workpiece;

[0026] The infrared thermometer is used to collect the regional temperature of the workpiece;

[0027] The fiber laser is used to preheat and mark the workpiece;

[0028] The main control MCU includes: a transportation unit, a temperature collection unit, a standard temperature selection unit, a laser preheating unit, and a laser marking unit;

[0029] The transport unit is used to take out the workpiece from the die-casting mold and transport it to the two-dimensional code marking position through a manipulator; wherein the workpiece includes a marking area corresponding to the two-dimensional code marking position, and the marking area includes marking sub-areas divided according to the size of the two-dimensional code pixels;

[0030] The temperature acquisition unit is used to control the infrared thermometer to respectively acquire the temperature of each of the marking sub-areas;

[0031] The standard temperature selection unit is used to select the highest temperature in each of the marking sub-areas as the standard temperature;

[0032] The laser preheating unit is used to control the fiber laser to preheat each of the marking sub-areas at a first power according to the standard temperature, so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference; wherein the laser of the first power will only heat the marking sub-areas, and will not melt the marking sub-areas;

[0033] The laser marking unit is used to control the fiber laser to perform two-dimensional code marking on the marking area of ​​the workpiece at a second power according to the standard temperature after preheating is completed; wherein, the higher the standard temperature, the lower the second power, and the second power is greater than the first power.

[0034] Optionally, the system further includes: a fan, the fan is connected to the main control MCU, and the main control MCU further includes a fan control unit;

[0035] The fan control unit is used to control the fan to blow air to the two-dimensional code marking position to remove water vapor generated by cooling the die-casting mold.

[0036] Optionally, the system further includes:

[0037] A mobile air conditioner, the mobile air conditioner is connected to the fiber laser, the mobile air conditioner is communicatively connected to the main control MCU, and the main control MCU further includes a temperature reduction control unit;

[0038] The temperature reduction control unit is used to control a mobile air conditioner to cool the fiber laser in response to the temperature of the fiber laser reaching an extreme temperature; wherein the extreme temperature is obtained based on the overheat shutdown temperature of the fiber laser.

[0039] Optionally, the system further comprises: a heat preservation mechanism;

[0040] The heat preservation is used to perform heat preservation treatment on the marking area after the laser preheating unit works, so that the temperature change of each marking sub-area after preheating is lower than a preset change range.

[0041] Optionally, the laser preheating unit specifically includes: a power and time acquisition subunit and a preheating subunit;

[0042] The power and time acquisition subunit is used to obtain the first power of the fiber laser and the preheating time for each of the marking sub-areas according to the temperature difference between the standard temperature and each of the marking sub-areas;

[0043] The preheating subunit is used to control the fiber laser to preheat each of the marking sub-areas at the first power for the corresponding preheating time.

[0044] Optionally, the laser marking unit specifically includes: a second power obtaining subunit and a marking subunit;

[0045] The second power obtaining subunit is used to obtain the second power of the fiber laser according to the standard temperature;

[0046] The marking subunit is used to control the fiber laser to perform two-dimensional code marking on the marking area of ​​the workpiece at the second power; wherein the marking order of the fiber laser on each of the marking sub-areas is the same as the preheating order.

[0047] The beneficial effects of the present invention are as follows: 1. The workpiece is taken out from the die-casting mold by a manipulator and transported to the QR code marking position; the infrared thermometer is controlled to collect the temperature of each marking sub-area respectively, and the highest temperature in each marking sub-area is selected as the standard temperature; according to the standard temperature, the fiber laser is controlled to preheat each marking sub-area with a first power so that the temperature difference between each marking sub-area does not exceed the standard temperature difference; after the preheating is completed, according to the standard temperature, the fiber laser is controlled to mark the marking area of ​​the workpiece with a second power for QR code marking. Marking in this way has the following advantages: 1. Compared with the prior art, the present invention reduces the temperature difference in each marking area by preheating each marking sub-area, and then performs QR code marking, thereby ensuring that the depth of the marked QR code is uniform and improving the accuracy of the QR code recognition. 2. Compared with the prior art, the present invention preheats the marking sub-area, so that the temperature of the marking sub-area is higher and it is easier to be vaporized or melted by the laser, so a laser with lower power than the prior art can be used for marking, reducing energy waste. 3. The present invention adopts a fiber laser, which has a higher photoelectric conversion rate, stronger cutting ability and lower maintenance cost compared with the commonly used carbon dioxide laser. 2. The present invention marks the workpiece after it is taken out of the die-casting mold, so that the marked QR code can generate a storage space in advance for immediate storage of the workpiece process information of the subsequent steps, which can be applied to the die-casting machine without storage memory function, solving the problem of data lag. 3. The present invention controls the fan to blow air to the QR code marking position to remove the water vapor generated for cooling the die-casting mold. By blowing away the water vapor, the light-emitting effect of the fiber laser is avoided, causing the fiber laser to fail to work normally. 4. In response to the temperature of the fiber laser reaching the extreme temperature, the present invention controls the mobile air conditioner to cool the fiber laser. It avoids the heat of the fiber laser machine itself from being unable to dissipate, often overheating protection shutdown, and overheating drift causing deformation of the product. 5. After preheating is completed, the present invention performs insulation treatment on the marking area so that the temperature change of each marking sub-area after preheating is lower than the preset change range. It can effectively solve the problem of excessive temperature variation in the marking sub-area during the marking process. 6. The marking order of each marking sub-area of ​​the fiber laser of the present invention is the same as the preheating order. According to the principle of consistency of the temperature drop curve of the workpiece, it can be ensured that the temperature difference is kept to a minimum when marking each marking sub-area. The printed two-dimensional code is made more uniform. In summary, the present invention can make the two-dimensional code marking uniform by preheating the marking sub-area in the marking area and then marking it, thereby ensuring the accuracy of two-dimensional code recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic flow chart of a method for marking a two-dimensional code on a fiber laser assembly line provided by a specific embodiment of the present invention;

[0049] Figure 2 It is a structural schematic diagram of a main control MCU of a fiber laser assembly line two-dimensional code marking system provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention discloses a fiber laser assembly line QR code marking method and system. Those skilled in the art can refer to the content of this article and appropriately improve the technical details. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0051] The applicant has found through research that the existing technology of laser marking QR codes on metal workpieces has the following disadvantages: when the metal workpiece is just taken out of the die-casting mold, the cooling speed of each area is different due to the thickness or the order of exiting the mold, resulting in different temperatures in the marking area of ​​the same metal workpiece. Laser marking uses a laser with uniform power to mark the entire marking area, ignoring the temperature difference itself, resulting in inconsistent depths of vaporization or melting in different parts of the marking area, making the marked QR code difficult to recognize.

[0052] Therefore, the first aspect of the embodiment of the present invention discloses a fiber laser assembly line two-dimensional code marking method, such as Figure 1 As shown, the method includes:

[0053] Step S101: taking out the workpiece from the die-casting mold by a robot and transporting it to the QR code marking position.

[0054] The workpiece includes a marking area corresponding to the marking position of the two-dimensional code, and the marking area includes marking sub-areas divided according to the size of the two-dimensional code pixels.

[0055] QR codes can be used to store workpiece specification information, processing information, etc.

[0056] In the embodiment of the present invention, the manipulator takes out the workpiece from the die-casting mold and performs the marking operation before undergoing other process flows. As a result, the storage space for printing the QR code can directly store the subsequent process flow information, without the die-casting machine having to memorize and store the information and then send it to the storage space of the QR code. This can be applied to die-casting machines without storage and memory functions, solving the problem of data lag.

[0057] It should be noted that the embodiment of the present invention divides the marking area into multiple marking sub-areas according to the size of the QR code pixel point. This ensures that the fiber laser preheating and marking are performed in units of pixels, avoiding the temperature difference of the same pixel point during marking, resulting in unevenness of the same pixel point of the QR code, and causing a decrease in recognition rate.

[0058] Step S102: Control the infrared thermometer to collect the temperature of each marking sub-area respectively, and select the highest temperature in each marking sub-area as the standard temperature.

[0059] It should be noted that the infrared thermometer and the fiber laser are arranged on the same side of the QR code marking position and both face the QR code marking position.

[0060] Step S103: According to the standard temperature, control the fiber laser to preheat each marking sub-area at a first power, so that the temperature difference between each marking sub-area does not exceed the standard temperature difference.

[0061] The laser of the first power will only heat the marking sub-area but will not melt the marking sub-area.

[0062] It should be noted that the purpose of preheating each marking sub-area is to ensure that the temperature difference at each position in the marking area is small or even non-existent, so as to ensure that the QR code can be marked more evenly in the next step. The standard temperature difference is obtained through multiple experiments, and the ideal value of the standard temperature difference is 0.

[0063] It is worth mentioning that the preheating of each marking sub-area needs to be based on the standard temperature and the temperature drop curve of the workpiece, ensuring that after preheating each other marking sub-area, the temperature of the marking sub-area corresponding to the standard temperature drops to a temperature difference within the standard temperature difference with other marking sub-areas. Preheating does not necessarily mean heating each marking sub-area to the standard temperature, but also considering the temperature drop curve of the workpiece, which can effectively save energy.

[0064] Optionally, according to the standard temperature, controlling the fiber laser to preheat each marking sub-area at a first power includes:

[0065] According to the temperature difference between the standard temperature and each marking sub-area, a first power of the fiber laser and a preheating time for each marking sub-area are obtained;

[0066] The optical fiber laser is controlled to preheat each marking sub-area at a first power for a corresponding preheating time.

[0067] It should be noted that using the first power to heat different marking sub-areas for different periods of time so that the temperature difference of each marking sub-area is no greater than the standard temperature difference is easier to implement than preheating with different powers, and the service life of the fiber laser will not be reduced due to frequent changes in the power of the fiber laser.

[0068] Optionally, according to the standard temperature, after controlling the fiber laser to preheat each marking sub-area at a first power so that the temperature difference between each marking sub-area does not exceed the standard temperature difference, the method further includes:

[0069] The marking area is subjected to heat preservation treatment so that the temperature variation of each marking sub-area after preheating is lower than the preset variation range.

[0070] It should be noted that heat preservation treatment of the marking area can ensure that the temperature of the marking area remains at a relatively low level during marking, thereby making the marking more uniform. The heat preservation device is arranged on the manipulator.

[0071] Step S104: After preheating is completed, the fiber laser is controlled to mark the marking area of ​​the workpiece with a two-dimensional code at a second power according to the standard temperature.

[0072] The higher the standard temperature, the lower the second power, and the second power is greater than the first power. The second power is used for marking, and the first power is used for preheating. The preheating is not enough to melt or vaporize the workpiece surface, so the second power is greater than the first power.

[0073] Since the embodiment of the present invention has preheated the marking area in step S103, so that the marking area is melted or vaporized, a lower power laser can be used compared to the prior art, thereby reducing energy waste.

[0074] Optionally, according to the standard temperature, controlling the fiber laser to mark the marking area of ​​the workpiece with a second power to mark the QR code includes:

[0075] According to the standard temperature, a second power of the fiber laser is obtained;

[0076] The fiber laser is controlled to mark the marking area of ​​the workpiece with a second power to mark the two-dimensional code; wherein the marking order of the fiber laser on each marking sub-area is the same as the preheating order.

[0077] It should be noted that the marking sequence of the fiber laser of the present invention is the same as the preheating sequence for each marking sub-area. This ensures that the preheating and marking time intervals for each marking sub-area are consistent. Since the same workpiece material is used, the temperature drop at the same time interval should also be the same, ensuring that the temperature difference is kept to a minimum when marking each marking sub-area. This makes the printed QR code more uniform.

[0078] Optionally, the method further includes:

[0079] Control the fan to blow air to the QR code marking position to remove the water vapor generated by cooling the die-casting mold.

[0080] The blowing direction of the fan is perpendicular to the line connecting the QR code marking position and the fiber laser machine.

[0081] It is worth mentioning that the air outlet of the fan is located in the marking environment, where there is water vapor generated by cooling the die-casting mold. The air inlet of the fan is in another independent environment, which is dry and has controllable humidity to ensure that the air blown by the fan does not carry water vapor.

[0082] It should be noted that the embodiment of the present invention avoids the effect of water vapor on the light emission of the fiber laser by blowing away the water vapor, which may cause the fiber laser to fail to work normally.

[0083] Optionally, the method further includes:

[0084] In response to the temperature of the fiber laser reaching an extreme temperature, the mobile air cooler is controlled to cool the fiber laser; wherein the extreme temperature is obtained based on the overheat shutdown temperature of the fiber laser. The extreme temperature generally does not exceed 40°C.

[0085] It should be noted that the embodiments of the present invention avoid the problem that the heat of the fiber laser machine itself cannot be dissipated, the overheating protection shutdown often occurs, and the overheating drift causes the deformation of the printed product.

[0086] Optionally, the QR code corresponds to a storage space, and the storage space receives and stores each process information of the workpiece after marking.

[0087] Based on the above-disclosed fiber laser assembly line two-dimensional code marking method, an embodiment of the present invention further discloses a fiber laser assembly line two-dimensional code marking system corresponding thereto, the system comprising: a manipulator, an infrared thermometer and a fiber laser arranged relative to the two-dimensional code marking position, and a main control MCU; the main control MCU is respectively connected to the manipulator, the infrared thermometer, and the fiber laser for communication;

[0088] A manipulator, used to transport workpieces;

[0089] Infrared thermometer, used to collect the regional temperature of the workpiece;

[0090] Fiber laser for preheating and marking workpieces;

[0091] The main control MCU is Figure 2 The example shown includes: a transport unit 201, a temperature collection unit 202, a standard temperature selection unit 203, a laser preheating unit 204, and a laser marking unit 205;

[0092] The transport unit 201 is used to take out the workpiece from the die-casting mold and transport it to the two-dimensional code marking position through a manipulator; wherein the workpiece includes a marking area corresponding to the two-dimensional code marking position, and the marking area includes marking sub-areas divided according to the size of the two-dimensional code pixels;

[0093] The temperature collection unit 202 is used to control the infrared thermometer to collect the temperature of each marking sub-area;

[0094] A standard temperature selection unit 203, used to select the highest temperature in each marking sub-area as the standard temperature;

[0095] The laser preheating unit 204 is used to control the fiber laser to preheat each marking sub-area at a first power according to the standard temperature, so that the temperature difference between each marking sub-area does not exceed the standard temperature difference; wherein the laser of the first power will only heat the marking sub-area, and will not melt the marking sub-area;

[0096] The laser marking unit 205 is used to control the fiber laser to mark the marking area of ​​the workpiece with a second power to mark the two-dimensional code after preheating is completed according to the standard temperature; wherein, the higher the standard temperature, the lower the second power, and the second power is greater than the first power.

[0097] Optionally, the system further includes: a fan, the fan is connected to the main control MCU, and the main control MCU also includes a fan control unit;

[0098] The fan control unit is used to control the fan to blow air to the QR code marking position to remove the water vapor generated by cooling the die-casting mold.

[0099] Optionally, the system further includes:

[0100] A mobile air conditioner, the mobile air conditioner is connected to the fiber laser, the mobile air conditioner is communicatively connected to the main control MCU, and the main control MCU also includes a cooling control unit;

[0101] The temperature reduction control unit is used to control the mobile air conditioner to reduce the temperature of the fiber laser in response to the temperature of the fiber laser reaching an extreme temperature; wherein the extreme temperature is obtained according to the overheat shutdown temperature of the fiber laser.

[0102] Optionally, the system further comprises: a heat preservation mechanism;

[0103] The heat preservation is used to perform heat preservation treatment on the marking area after the laser preheating unit 204 works, so that the temperature change of each marking sub-area after preheating is lower than the preset change range.

[0104] Optionally, the laser preheating unit 204 specifically includes: a power and time acquisition subunit and a preheating subunit;

[0105] A power and time acquisition subunit, used to obtain the first power of the fiber laser and the preheating time for each marking sub-area according to the temperature difference between the standard temperature and each marking sub-area;

[0106] The preheating subunit is used to control the fiber laser to preheat each marking sub-area at a first power for a corresponding preheating time.

[0107] Optionally, the laser marking unit 205 specifically includes: a second power obtaining subunit and a marking subunit;

[0108] A second power obtaining subunit, used for obtaining a second power of the fiber laser according to a standard temperature;

[0109] The marking subunit is used to control the fiber laser to mark the marking area of ​​the workpiece with a second power to mark a two-dimensional code; wherein the marking order of the fiber laser on each marking sub-area is the same as the preheating order.

[0110] Optionally, the QR code corresponds to a storage space, and the storage space receives and stores each process information of the workpiece after marking.

[0111] The workpiece is taken out from the die-casting mold by a manipulator and transported to the QR code marking position; the infrared thermometer is controlled to collect the temperature of each marking sub-area respectively, and the highest temperature in each marking sub-area is selected as the standard temperature; according to the standard temperature, the fiber laser is controlled to preheat each marking sub-area with a first power so that the temperature difference between each marking sub-area does not exceed the standard temperature difference; after the preheating is completed, according to the standard temperature, the fiber laser is controlled to mark the marking area of ​​the workpiece with a second power. There are the following advantages of marking in this way: 1. Compared with the prior art, the embodiment of the present invention reduces the temperature difference in each part of the marking area by preheating each marking sub-area, and then performs QR code marking, which ensures that the depth of the QR code is uniform and improves the accuracy of the QR code recognition. 2. Compared with the prior art, the embodiment of the present invention preheats the marking sub-area, so that the temperature of the marking sub-area is higher and it is easier to be vaporized or melted by the laser, so a laser with lower power than the prior art can be used for marking, which reduces energy waste. 3. The fiber laser used in the embodiment of the present invention has a higher photoelectric conversion rate, stronger cutting ability and lower maintenance cost compared with the commonly used carbon dioxide laser. In the embodiment of the present invention, the workpiece is marked after being taken out of the die-casting mold, so that the marked QR code can generate a storage space in advance for immediate storage of the workpiece process information of the subsequent steps, which can be applied to the die-casting machine without storage memory function, and solves the problem of data lag. In the embodiment of the present invention, the fan is controlled to blow air to the QR code marking position to remove the water vapor generated for cooling the die-casting mold. By blowing away the water vapor, the light-emitting effect of the fiber laser is avoided, causing the fiber laser to fail to work normally. In response to the temperature of the fiber laser reaching the extreme temperature, the embodiment of the present invention controls the mobile air conditioner to cool the fiber laser. It avoids the heat of the fiber laser machine itself from being unable to dissipate, often overheating protection shutdown, and overheating drift causing deformation of the product. After the preheating is completed, the embodiment of the present invention performs insulation treatment on the marking area so that the temperature change of each marking sub-area after preheating is lower than the preset change range. The problem of excessive temperature variation in the marking sub-area during the marking process can be effectively solved. The marking order of each marking sub-area of ​​the fiber laser in the embodiment of the present invention is the same as the preheating order. According to the principle of consistency of the temperature drop curve of the workpiece, it can be ensured that the temperature difference is kept to a minimum when marking each marking sub-area. This makes the printed QR code more uniform. In summary, the embodiment of the present invention can make the QR code marking uniform and ensure the recognition accuracy by preheating the marking sub-area in the marking area and then marking.

[0112] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0113] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0114] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A fiber laser assembly line two-dimensional code marking method, characterized in that: The method comprises: The workpiece is taken out from the die-casting mold by a manipulator and transported to a two-dimensional code marking position; wherein the workpiece includes a marking area corresponding to the two-dimensional code marking position, and the marking area includes marking sub-areas divided according to the size of two-dimensional code pixels; Controlling the infrared thermometer to collect the temperature of each of the marking sub-areas respectively, and selecting the highest temperature in each of the marking sub-areas as the standard temperature; According to the standard temperature, controlling the fiber laser to preheat each of the marking sub-areas at a first power so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference; wherein the laser of the first power will only heat the marking sub-areas but will not melt the marking sub-areas; After preheating is completed, the fiber laser is controlled to perform two-dimensional code marking on the marking area of ​​the workpiece at a second power according to the standard temperature; wherein, the higher the standard temperature, the lower the second power, and the second power is greater than the first power.

2. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: The method further comprises: The fan is controlled to blow air to the QR code marking position to remove water vapor generated by cooling the die-casting mold.

3. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: The method further comprises: In response to the temperature of the fiber laser reaching an extreme temperature, a mobile air cooler is controlled to cool the fiber laser; wherein the extreme temperature is obtained according to an overheat shutdown temperature of the fiber laser.

4. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: After controlling the fiber laser to preheat each of the marking sub-areas at a first power according to the standard temperature so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference, the method further includes: The marking area is subjected to a heat preservation treatment so that the temperature change of each marking sub-area after preheating is lower than a preset change range.

5. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: According to the standard temperature, controlling the fiber laser to preheat each of the marking sub-areas at a first power includes: According to the temperature difference between the standard temperature and each of the marking sub-areas, obtaining the first power of the fiber laser and the preheating time for each of the marking sub-areas; The fiber laser is controlled to preheat each of the marking sub-areas at the first power for the corresponding preheating time.

6. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: According to the standard temperature, controlling the fiber laser to mark the marking area of ​​the workpiece with a second power to mark the two-dimensional code includes: According to the standard temperature, obtaining the second power of the fiber laser; The fiber laser is controlled to perform two-dimensional code marking on the marking area of ​​the workpiece at the second power; wherein the marking order of the fiber laser on each of the marking sub-areas is the same as the preheating order.

7. The fiber laser assembly line two-dimensional code marking method according to claim 1, characterized in that: The two-dimensional code corresponds to a storage space, and the storage space receives and stores each process flow information of the workpiece after marking.

8. A fiber laser assembly line two-dimensional code marking system, characterized in that: The system comprises: a manipulator, an infrared thermometer and an optical fiber laser arranged opposite to the marking position of the two-dimensional code, and a main control MCU; the main control MCU is respectively connected to the manipulator, the infrared thermometer and the optical fiber laser for communication; The manipulator is used to transport the workpiece; The infrared thermometer is used to collect the regional temperature of the workpiece; The fiber laser is used to preheat and mark the workpiece; The main control MCU includes: a transportation unit, a temperature collection unit, a standard temperature selection unit, a laser preheating unit, and a laser marking unit; The transport unit is used to take out the workpiece from the die-casting mold and transport it to the two-dimensional code marking position through a manipulator; wherein the workpiece includes a marking area corresponding to the two-dimensional code marking position, and the marking area includes marking sub-areas divided according to the size of the two-dimensional code pixels; The temperature acquisition unit is used to control the infrared thermometer to respectively acquire the temperature of each of the marking sub-areas; The standard temperature selection unit is used to select the highest temperature in each of the marking sub-areas as the standard temperature; The laser preheating unit is used to control the fiber laser to preheat each of the marking sub-areas at a first power according to the standard temperature, so that the temperature difference between each of the marking sub-areas does not exceed the standard temperature difference; wherein the laser of the first power will only heat the marking sub-areas, and will not melt the marking sub-areas; The laser marking unit is used to control the fiber laser to perform two-dimensional code marking on the marking area of ​​the workpiece at a second power according to the standard temperature after preheating is completed; wherein, the higher the standard temperature, the lower the second power, and the second power is greater than the first power.

9. The fiber laser assembly line two-dimensional code marking system according to claim 8, characterized in that: The system further comprises: a fan, the fan is connected to the main control MCU, and the main control MCU further comprises a fan control unit; The fan control unit is used to control the fan to blow air to the two-dimensional code marking position to remove water vapor generated by cooling the die-casting mold.

10. The fiber laser assembly line two-dimensional code marking system according to claim 8, characterized in that: The system further comprises: A mobile air conditioner, the mobile air conditioner is connected to the fiber laser, the mobile air conditioner is communicatively connected to the main control MCU, and the main control MCU also includes a temperature reduction control unit; The temperature reduction control unit is used to control a mobile air conditioner to cool the fiber laser in response to the temperature of the fiber laser reaching an extreme temperature; wherein the extreme temperature is obtained based on the overheat shutdown temperature of the fiber laser.

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