Volume measuring device for laser welding pool

Abstract

The utility model discloses a device for measuring the volume of a laser welding pool, which relates to the technical field of laser welding and comprises a conveying piece, mounting tables mounted on two sides of the conveying piece, a support frame mounted on the mounting tables, a welding device and an upper protective shell arranged at the top of the inner side of the support frame, and a semiconductor laser transmitter arranged in the upper protective shell. A wire filling machine connected with the welding device is further arranged on the supporting frame, a lower protection shell is installed at the bottom of the conveying piece, and a semiconductor laser receiver is arranged in the lower protection shell. The semiconductor laser transmitter and the semiconductor laser receiver of the device do not need to be additionally provided with a safety protection and shielding device, use is convenient and fast, safety is high, the inter-plate gap is measured through the sectional area of a laser beam, the detection precision is far better than that of traditional manual sampling inspection, and the straightness change of double-side plate materials can be captured in real time; accurate data support is provided for volume control of the molten pool, meanwhile, purging nozzles on the upper protective shell and the lower protective shell are continuously cleaned, and the detection stability is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser welding technical field, specifically, relate to a kind of laser welding molten pool volume measuring device. BACKGROUND

[0002] In modern manufacturing industry, laser welding has been widely used in precision machining fields such as automobile sheet metal tailor welding due to its high energy density, fast welding speed, small heat-affected zone and other significant advantages. As a key process in automobile manufacturing, the welding quality of automobile sheet metal laser tailor welding directly affects the structural strength, safety and service life of the automobile body. The stability of the welding pool volume is one of the core factors that determine the quality of the welded joint. During the process of automobile sheet metal laser tailor welding, the gap stability of the raw materials (especially the straightness of the double-sided sheets) has a decisive influence on the welding quality. In the ideal state, the double-sided sheets should maintain a uniform gap that meets the process requirements to ensure that the welding wire can be smoothly filled and form a uniform and stable molten pool after melting. However, in actual production scenarios, the straightness of the double-sided sheets is difficult to remain consistent due to various factors such as production precision of raw materials, deformation during transportation and storage, positioning error during feeding, etc., resulting in random fluctuations in the gap between the sheets.

[0003] In the prior art, the gap between the sheets and the welding quality are mainly controlled by manual sampling inspection. However, this method has many limitations. On the one hand, manual sampling inspection cannot achieve 100% full coverage detection, making it difficult to accurately identify the gap deviation of each set of sheets, and thus unable to timely adjust the welding parameters (such as defocusing amount, offset amount, wire filling amount, etc.), directly or indirectly leading to quality defects such as insufficient molten pool volume or excess in the welded joint, making it difficult to effectively control the molten pool volume during the welding process. On the other hand, if manual 100% inspection is performed on the tailor-welded double-sided sheets to ensure comprehensive detection, it will significantly increase the working hours and reduce the production efficiency. Moreover, measurement errors may occur due to individual inspection standard differences of operators and visual fatigue, and the manual detection results cannot be matched with the welding parameters in real time, making it difficult to achieve precise control.

[0004] To solve the above problems, a laser welding molten pool volume measuring device is proposed. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model can use the following technical solutions to achieve:

[0006] The utility model provides a kind of laser welding molten pool volume measuring device, including conveying piece, two installation platforms are symmetrically installed on the both sides of conveying piece, two installation platforms are jointly installed with support frame, welding device and upper protective shell are arranged on the inside top of support frame, semiconductor laser transmitter is arranged in upper protective shell, support frame is further provided with wire feeder connected with welding device, lower protective shell is installed in the bottom of conveying piece, semiconductor laser receiver is arranged in lower protective shell, semiconductor laser receiver and semiconductor laser transmitter are correspondingly arranged, a plurality of purge spray heads are arranged on upper protective shell and lower protective shell, purge spray head is connected with external compressed gas supply device by pipeline, controller is further provided on conveying piece, conveying piece, wire feeder, welding device, semiconductor laser receiver, semiconductor laser transmitter are electrically connected with controller.

[0007] Preferably, the two installation platforms are fixedly provided with mounting seats, and the mounting seats are rotatably provided with limiting knobs on the sides close to each other.

[0008] Preferably, the two limiting knobs are rotatably provided with auxiliary wheels on the sides close to each other.

[0009] Preferably, the limiting knobs are detachably connected with sleeves rotatably arranged on the mounting seats, and the output ends of the driving motors on the mounting seats are fixedly connected with the sleeves.

[0010] As described above, the utility model has the following beneficial effects:

[0011] The gap detection device carried by the device uses a semiconductor laser transmitter and a semiconductor laser receiver with a wavelength of 670 nanometers and a maximum output power of 1 milliwatt to generate class 2 laser according to the DIN EN 60825 standard, without the need for additional safety protection and shielding devices, convenient to use and high in safety, the gap between the boards is measured by the laser beam cross-sectional area calculation board, the detection accuracy is much higher than traditional manual sampling inspection, the straightness change of the double-sided plate material can be captured in real time, providing accurate data support for molten pool volume control, at the same time, the purge spray heads on the upper protective shell and the lower protective shell are continuously cleaned, which can effectively prevent welding dust and smoke from polluting the semiconductor laser receiver and the semiconductor laser transmitter, ensure the detection stability, and solve the problem that traditional detection is easily disturbed by the environment.

[0012] The device constructs a closed loop control system of "gap detection-data processing-wire filling regulation", the controller receives laser detection data in real time, the data is converted quickly to adjust the wire filling amount, the selected Fronius transPuls Synergic 27004R / Z CMT wire filling machine is matched with a precise wire feeding system, the precise wire filling amount feeding can be realized, the wire filling amount is adjusted in real time through dynamic matching of the wire filling speed and the welding speed, the quality defects of insufficient or excessive molten pool volume in traditional welding are solved, in addition, the double-sided plates are corrected through the limiting push plate and the auxiliary wheel, a standard alignment gap of 0.8mm is reserved, and a stable basis is provided for the welding wire filling. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a whole structure schematic view of the utility model;

[0014] Figure 2 It is a structure schematic view of the supporting frame and the lower protective shell in the utility model;

[0015] Figure 3 It is a structure schematic view of the limiting push plate and the auxiliary wheel in the utility model;

[0016] Figure 4 It is Figure 2 An enlarged schematic view of position A in the utility model.

[0017] In the figure: 1, conveying part; 2, wire filling machine; 3, supporting frame; 4, controller; 5, driving motor; 6, welding device; 7, lower protective shell; 8, mounting table; 9, limiting push plate; 10, auxiliary wheel; 11, mounting seat; 12, blowing nozzle; 13, upper protective shell. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0019] The embodiments provided by the utility model will be described in detail as follows:

[0020] As Figures 1-4As shown, a kind of laser welding molten pool volume measuring device, including conveying piece 1, two installation platforms 8 are symmetrically installed on the two sides of conveying piece 1, support frame 3 is jointly installed on two installation platforms 8, welding device 6 and upper protective shell 13 are arranged on the inner side top of support frame 3, semiconductor laser emitter is arranged in upper protective shell 13, wire feeder 2 connected with welding device 6 is also arranged on support frame 3, lower protective shell 7 is installed at the bottom of conveying piece 1, semiconductor laser receiver is arranged in lower protective shell 7, semiconductor laser receiver is correspondingly arranged with semiconductor laser emitter, a plurality of purge nozzles 12 are arranged on upper protective shell 13 and lower protective shell 7, purge nozzle 12 is connected with external compressed gas supply device through pipeline, controller 4 is also arranged on conveying piece 1, conveying piece 1, wire feeder 2, welding device 6, semiconductor laser receiver, semiconductor laser emitter are electrically connected with controller 4.Conveying piece 1, wire feeder 2, welding device 6, semiconductor laser receiver, semiconductor laser emitter, controller 4, external compressed gas supply device are all prior art known, hereinafter will not be described repeatedly.Wire feeder 2 selects FroniustransPulsSynergic2700 4R / Z CMT wire feeder, cooperates accurate wire feeding system, and can realize the accurate feeding of wire filling amount.

[0021] Semiconductor laser receiver and semiconductor laser emitter jointly form gap detection device, wavelength 670 nanometers, maximum output power 1 milliwatt semiconductor laser emitter and semiconductor laser receiver are used, and 2 type laser is generated according to DIN EN 60825 standard, without additional safety protection and shielding device, convenient to use and high safety, the gap between the boards is measured through laser beam cross section calculation board, the detection accuracy is far more than traditional artificial sampling inspection, can capture the straightness change of double-sided plate material in real time, provides accurate data support for the measurement and control of molten pool volume.Through the setting of purge nozzle 12 on upper protective shell 13 and lower protective shell 7, it can effectively avoid that welding dust and smoke pollute semiconductor laser receiver and semiconductor laser emitter, ensure the detection stability, solve the problem that traditional detection is easily disturbed by environment.

[0022] Two mounting seats 11 are fixedly arranged on two installation platforms 8, sleeve is rotatably arranged on the side of two mounting seats 11 close to each other, one limit lever 9 is detachably installed on two sleeves, drive motor 5 is arranged on two mounting seats 11, the output end of drive motor 5 is fixedly connected with adjacent sleeve, for driving sleeve and limit lever 9 to rotate, auxiliary wheel 10 is rotatably arranged on the side of two limit levers 9 close to each other, auxiliary wheel 10 can reduce the friction between plate material and limit lever 9.Limit lever 9 is correspondingly arranged with the size of the plate material to be tailor-welded, and different limit levers 9 can be replaced to limit different sizes of plate material.Drive motor 5 is prior art known, hereinafter will not be described repeatedly.

[0023] The specific working principle of the device is as follows:

[0024] The conveying part 1 is the core carrier of the plate conveying. It drives the automobile tailor-welded plate to move stably to the welding area according to the preset welding assembly line speed. Before the plate is transported, the limiting plate 9 is retracted and perpendicular to the conveying direction of the conveying part 1. After the driving motor 5 is started, it drives the limiting plate 9 connected thereto to rotate, so that the limiting plate 9 is parallel to the conveying direction of the conveying part 1. Through the contact of the two limiting plates 9 and the two auxiliary wheels 10 with the two sides of the plate, the two plates to be spliced transported are limited and corrected, the gap between the two plates is adjusted, and a standard alignment gap of 0.8mm is reserved to reduce the positioning error of the feeding and lay a foundation for the subsequent gap detection and welding operation. After the plate is limited and adjusted by the two limiting plates 9, the semiconductor laser emitter in the upper protective shell 13 emits a laser beam, which is received by the semiconductor laser receiver in the lower protective shell 7 after passing through the plate gap. The semiconductor laser receiver accurately calculates the real-time gap data of the two plates by capturing the cross-sectional area of the laser beam, and transmits the gap data to the controller 4. After the controller 4 processes the data, it combines the preset 0.8mm standard alignment gap, calculates the required wire filling amount (the change of the wire filling amount is realized by matching the wire filling speed and the welding speed) according to the real-time straightness change of the plate, and selects the Fronius transPuls Synergic27004R / Z CMT wire feeder matched with the precise wire feeding system to realize the precise feeding of the wire filling amount. Through the dynamic matching of the wire filling speed and the welding speed, the wire filling amount is adjusted in real time according to the plate gap fluctuation, solving the quality defects of insufficient or excessive molten pool volume in traditional welding. The controller 4 can display the gap data, wire filling amount and other parameters in real time, and the staff can also preset the parameter threshold and start or stop the equipment through the controller 4 to realize manual auxiliary control. As the conveying part 1 continues to run, the semiconductor laser emitter and the semiconductor laser receiver continue to detect the gap of the subsequent plate, thereby measuring the required molten pool volume and the corresponding wire filling amount at different positions. The measured plate gap is conveyed to the welding device 6 below for welding. The precise amount of welding wire is conveyed to the welding area through the welding device 6, and the welding wire is melted under the action of the laser of the welding device 6 to fill the plate gap and form a stable molten pool. Finally, high-quality welding is completed. The whole process is controlled through the closed loop of "detection-treatment-regulation-welding" to ensure that the molten pool volume always remains stable and avoids quality defects of insufficient or excessive molten pool volume.

[0025] During this process, the blowing nozzles 12 on the upper protective shell 13 and the lower protective shell 7 cooperate with the external compressed gas supply device to continuously spray compressed air to timely remove dust and smoke from the welding area, avoid pollution of the semiconductor laser receiver and the semiconductor laser emitter, and ensure detection accuracy.

[0026] The above merely illustrates the embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laser welding molten pool volume measurement device, characterized by, The utility model relates to a welding device for semiconductor laser, including conveying spare (1), conveying spare (1) both sides symmetry formula installation has two installation platform (8), two installation platform (8) are installed with support frame (3) jointly, support frame (3) inboard top is provided with welding device (6) and upper protective housing (13), is provided with semiconductor laser emitter in upper protective housing (13), support frame (3) still is provided with the filler rod machine (2) connected with welding device (6), conveying spare (1) bottom is installed with lower protective housing (7), is provided with semiconductor laser receiver in lower protective housing (7), semiconductor laser receiver with semiconductor laser emitter correspondingly sets up, and upper protective housing (13) and lower protective housing (7) all are provided with a plurality of blow -off spray head (12), blow -off spray head (12) is connected with external compressed gas supply device through pipeline, conveying spare (1) still is provided with controller (4), conveying spare (1), filler rod machine (2), welding device (6), semiconductor laser receiver, semiconductor laser emitter all with controller (4) electric connection.

2. A laser welding molten pool volume measurement device according to claim 1, wherein, Two installation platform (8) all are fixedly provided with mounting seat (11), and the side of two mounting seats (11) mutually close is all rotatably arranged with limit shift plate (9), and mounting seat (11) is still provided with the drive motor (5) for driving limit shift plate (9) rotation.

3. A laser welding molten pool volume measurement device according to claim 2, wherein, The side of two limit shift plates (9) mutually close is rotatably arranged with auxiliary wheel (10).

4. A laser welding melt pool volume measurement device according to claim 3, wherein, Limit shift plate (9) and the sleeve rotatably arranged on mounting seat (11) are detachably connected, and the output end of drive motor (5) on mounting seat (11) is fixedly connected with the sleeve.

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