A welding non-stick detection system and method

Abstract

The invention discloses a non-stick welding detection system, comprising a wire feeding mechanism, a control module, a detection switch and a host computer. The detection switch is used to detect whether the gold wire is transported to determine whether there is a non-stick welding phenomenon, thereby eliminating the need for setting a switching device, saving costs, improving the overall lifespan, and having a simple structure. The invention discloses a non-stick welding detection method, wherein the number of detection times is set on the host computer, and after the number of detection times is reached, the host computer reads information stored in the control module. If there is a non-stick welding phenomenon, the machine tool is controlled to stop working and an alarm is sounded to prompt a staff member to perform maintenance or refill materials, thereby ensuring the reliability of welding. At the same time, when the non-stick welding phenomenon occurs, the work can be stopped in time for maintenance, thereby reducing the maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of welding detection, in particular to a welding non-stick detection system and method. Background Art

[0002] The non-stick soldering detection is an important inspection item for the welding quality of the gold wire ball bonding machine of LED packaging equipment. This inspection can improve the welding yield rate. The non-stick soldering detection device is a device that can accurately measure the phenomenon of loose welding and no welding between the gold wire and the chip pin or the gold wire and the chip bracket in the process of LED lead welding, and issue a command to notify the control system to stop and check.

[0003] LED wire bonding machine has an important process in the wire bonding process, which is "ball burning". "Ball burning" is to use a high-voltage ignition device to pass a large current through the welding end of the gold wire to make the gold wire heat up and melt to form a gold wire ball. The purpose of "ball burning" is to heat the welding wire end to help welding. At the same time, burning into a ball will increase the contact area, making the contact between the gold wire and the welded point after welding more complete and the welding more firm. The existing non-stick welding detection device needs to apply current to the tail end of the gold wire, and when "ball burning", the current needs to pass through the tail end of the gold wire and the ground to form a loop, so that the tail of the gold wire will switch back and forth between the current output end of the non-stick welding detection device and the ground. Since the speed of the wire bonding is very high, the operating frequency of the switching device is very high, which greatly shortens the life of the switching device. In addition, the existing non-stick welding detection device is difficult to make or purchase due to high technical difficulty and narrow application. The prices of non-stick welding detection devices on the market are generally high. Summary of the invention

[0004] To solve the above problems, the purpose of the present invention is to provide a non-stick welding detection system and method, which determines whether the welding is successful by detecting whether the wire is fed. No switching device is required, thus avoiding the component life problem caused by frequent switching. It has a simple structure and low price, which can effectively save the cost of gold wire bonding machines.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A non-stick welding detection system comprises a wire feeding mechanism for conveying a gold wire, a control module for controlling the action of the wire feeding mechanism, a detection switch for detecting whether the gold wire is conveyed, and a host computer for stopping the operation of a machine tool and giving an alarm when non-stick welding occurs, wherein the control module is respectively connected to the wire feeding mechanism and the detection switch, and the control module is data-connected to the host computer; the control module stores detection information of the detection switch, and the host computer reads the detection information stored in the control module.

[0007] Furthermore, the control module includes a main controller, a driving module for driving the wire feeding mechanism, and a communication module for connecting data with the outside. The main controller is connected to the driving module, the communication module, and the detection switch respectively, and the host computer is connected to the main controller through the communication module. When the detection times of the host computer are reached, it is connected to the main controller through the communication module, and the detection information in the main controller is read, and whether the non-stick welding phenomenon occurs is determined by the detection information in the main controller.

[0008] Furthermore, the wire feeding mechanism is a stepping motor, and the driving module is a stepping motor driving unit.

[0009] Furthermore, the detection switch is an optical fiber sensor. Since the size of the gold wire is small, the general sensor cannot detect its transportation, but the optical fiber sensor can detect the transportation of the gold wire.

[0010] Furthermore, the main controller is a single chip microcomputer.

[0011] Furthermore, it also includes a fixing mechanism for facilitating gold wire welding, the fixing mechanism includes a tensioner, a wire clamp and a porcelain nozzle, and the gold wire delivered by the wire feeding mechanism passes through the tensioner, the wire clamp and the porcelain nozzle in sequence. The fixing mechanism can ensure the accurate position of the gold wire during welding and reduce errors.

[0012] A non-stick welding detection method comprises the following steps:

[0013] A. The host computer sets the number of detection times;

[0014] B. The wire bonding machine starts welding wires;

[0015] C. When the number of detections reaches a certain limit, the host computer reads the detection information stored in the control module;

[0016] D. If the detection information contains information that the detection switch is triggered, go to step B; if the detection information does not contain information that the detection switch is triggered, the host computer controls the machine tool to stop working and issues an alarm.

[0017] Furthermore, in step C, the host computer reads the detection information stored in the control module, and the host computer is connected to the control module through the communication module.

[0018] Furthermore, the information that the detection switch is triggered in step D is the information that the detection switch detects that the gold wire is being transported. Only when the non-stick phenomenon does not occur, the gold wire will be normally worn out and the gold wire will be transported, so that the detection switch can detect that the gold wire is being transported.

[0019] The beneficial effects of the present invention are as follows: the present invention adopts a non-stick welding detection system, each time the wire is welded, a little gold wire will be consumed. If the non-stick welding phenomenon occurs, the gold wire will not be consumed. When the consumed gold wire is enough, the detection switch will transmit the detection information to the control module, and the control module will control the wire feeding mechanism to transport the gold wire. At the same time, a host computer is provided, and the host computer can read the detection information stored in the control module. By setting the detection times of the host computer, it can realize the timed detection of whether the non-stick welding phenomenon occurs. The structure is simple and no switching device is required.

[0020] A non-stick welding detection method is provided. The detection times are set by a host computer. During the detection times, a wire welding machine performs wire welding. After the detection times are reached, the host computer reads the information stored in the control module. If the information that the detection switch is triggered is read, it means that the non-stick welding phenomenon has not occurred. If the information that the detection switch is triggered is not read, it means that the non-stick welding phenomenon has occurred. The host computer controls the machine tool to stop working and alarms. Through the setting of the host computer, it can be realized to detect whether the non-stick welding phenomenon occurs at a fixed time to ensure the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0022] Figure 1 It is a principle diagram of a non-stick welding detection system of the present invention;

[0023] Figure 2 It is a flow chart of a non-stick welding detection method of the present invention;

[0024] Figure 3 It is an overall flow chart of a non-stick welding detection system of the present invention. DETAILED DESCRIPTION

[0025] Non-stick welding refers to the situation that the gold wire is not firmly welded to the lamp bead pin or the bracket or is difficult to weld. During the entire welding process, each successful welding will consume a little gold wire. If non-stick welding occurs, the gold wire will not be consumed. The present invention uses this feature to detect the non-stick welding phenomenon.

[0026] Reference Figure 1A non-stick welding detection system of the present invention comprises a wire feeding mechanism 1, a control module 2, a detection switch 3 and a host computer 4. After the welding is successful and a certain amount of gold wire is consumed, the detection switch 3 will be triggered and the detection information will be transmitted to the control module 2. After receiving the detection information, the control module 2 controls the wire feeding mechanism 1 to transport the gold wire. If the non-stick welding phenomenon occurs during the welding process, the amount of gold wire consumed is not enough to trigger the detection switch 3, and the control module 2 will not receive the detection information transmitted by the detection switch 3. The host computer 4 will read the information stored in the control module 2. If the information that the detection switch 3 is triggered is not read, it is considered that the non-stick welding phenomenon has occurred. The host computer 4 controls the machine tool to stop working and alarms to prompt the staff to perform maintenance or replace the raw materials.

[0027] In order to ensure the correctness of each detection, the detection times are set on the host computer 4. When the detection times are reached, the host computer 4 will read the information stored in the control module 2. The information stored in the control module 2 is the detection information of the detection switch 3 during the detection times set by the host computer 4. If the detection switch 3 detects the conveying information of the gold wire during the detection times, there is no non-stick welding phenomenon. If there is no detection information of the detection switch 3, it means that the non-stick welding phenomenon has occurred. Then the host computer 4 controls the machine tool to stop working and alarm.

[0028] Specifically, the control module 2 of the present invention includes a main controller 21, a drive module 22 and a communication module 23, wherein the drive module 22 is used to drive the wire feeding mechanism 1 to work, and the communication module 23 is used to establish data connection with the host computer 4. The detection information of the detection switch 3 will be transmitted to the main controller 21 and stored. The main controller 21 will determine whether to send a control signal to the control drive module 22 to drive the wire feeding mechanism 1 to feed the wire based on the detection information of the detection switch 3.

[0029] Specifically, the wire feeding mechanism 1 is a stepper motor, the driving module 22 is a stepper motor driving unit, and the main controller 21 is a single chip microcomputer.

[0030] However, since the size of the gold wire is too small, the accuracy of general sensors is not so high and cannot detect the transportation of the gold wire. Therefore, the present invention uses an optical fiber sensor as the detection switch 3, which can accurately detect the transportation of the gold wire.

[0031] The present invention also provides a fixing mechanism at the end of the gold wire for facilitating gold wire welding. The fixing mechanism includes a tensioner, a wire clamp and a porcelain nozzle. The gold wire delivered by the wire feeding mechanism 1 passes through the tensioner, the wire clamp and the porcelain nozzle in sequence, which can ensure the accurate position of the gold wire during welding and reduce errors.

[0032] The system of the present invention can accurately control the wire feeding amount each time and can achieve accurate alarm and shutdown when there are 3 to 5 consecutive welding points with non-stick welding. Since an LED lamp bead has at least 4 welding points, when non-stick welding occurs, the operator only needs to manually re-weld two materials at most, which saves manpower on the one hand and greatly reduces costs on the other.

[0033] Reference Figure 2 A non-stick welding detection method of the present invention comprises the following steps:

[0034] A. Host computer 4 sets the number of detection times;

[0035] B. The wire bonding machine starts welding wires;

[0036] C. When the number of detection times is reached, the host computer 4 reads the detection information stored in the control module 2; D. If the detection information contains information that the detection switch 3 is triggered, go to step B; if the detection information does not contain information that the detection switch 3 is triggered, the host computer 4 controls the machine tool to stop working and issues an alarm.

[0037] Specifically, in step C, the host computer 4 reads the detection information stored in the control module 2 , and the host computer 4 is connected to the control module 2 via the communication module 23 .

[0038] Specifically, the information that the detection switch 3 is triggered in step D is the information that the detection switch 3 detects that the gold wire is being transported. Only when the non-stick phenomenon does not occur, the gold wire will be normally consumed and the gold wire will be transported, so the detection switch 3 can detect that the gold wire is being transported.

[0039] Reference Figure 3 As shown, the overall process of the present invention is to first set the detection parameters on the host computer 4, and then the wire welding machine performs wire welding. During the wire welding process, the host computer 4 continuously determines whether the detection times have been reached. If not, the wire welding continues. If the detection times have been reached, the host computer 4 reads the information stored in the main controller 21 through the communication module 23. If the main controller 21 stores the information transmitted by the detection switch 3, it means that the welding is successful. If the main controller 21 does not store the information transmitted by the detection switch 3, it means that the welding is not sticky. At this time, the host computer 4 controls the machine tool to stop working and alarms the staff.

[0040] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation mode. As long as the technical effect of the present invention is achieved by the same means, it should belong to the protection scope of the present invention.

Claims

1. A non-stick welding detection system, characterized by: The invention comprises a wire feeding mechanism (1) for conveying a gold wire, a control module (2) for controlling the action of the wire feeding mechanism (1), a detection switch (3) for detecting whether the gold wire is conveyed, and a host computer (4) for stopping the operation of a machine tool and giving an alarm when welding does not stick, wherein the control module (2) is respectively connected to the wire feeding mechanism (1) and the detection switch (3), and the control module (2) is data-connected to the host computer (4); the control module (2) stores detection information of the detection switch (3), and the host computer (4) reads the detection information stored in the control module (2); the detection switch (3) is an optical fiber sensor; The control module (2) comprises a main controller (21), a driving module (22) for driving the wire feeding mechanism (1) to move, and a communication module (23) for connecting data with the outside, the main controller (21) being connected to the driving module (22), the communication module (23), and the detection switch (3) respectively, and the host computer (4) being connected to the main controller (21) via the communication module (23); When welding is successful and a certain amount of gold wire is consumed, the detection switch (3) will be triggered and the detection information will be transmitted to the control module (2). After receiving the detection information, the control module (2) controls the wire feeding mechanism (1) to feed the gold wire. If a non-stick phenomenon occurs during the welding process, the amount of gold wire consumed is not enough to trigger the detection switch (3), and the control module (2) will not receive the detection information transmitted by the detection switch (3). The host computer (4) will read the information stored in the control module (2). If the information that the detection switch (3) is triggered is not read, it is considered that a non-stick phenomenon has occurred, and the host computer (4) controls the machine tool to stop working and alarm. A detection number is set on the host computer (4). When the detection number is reached, the host computer (4) reads the information stored in the control module (2). The information stored in the control module (2) is the detection information of the detection switch (3) during the detection number set by the host computer (4). If the detection switch (3) detects the conveying information of the gold wire during the detection number, then the non-stick welding phenomenon has not occurred. If there is no detection information from the detection switch (3), then the non-stick welding phenomenon has occurred. Then, the host computer (4) controls the machine tool to stop working and issues an alarm prompt.

2. A non-stick welding detection system according to claim 1, characterized in that: The wire feeding mechanism (1) is a stepping motor, and the driving module (22) is a stepping motor driving unit.

3. A non-stick welding detection system according to claim 1, characterized in that: The main controller (21) is a single chip microcomputer.

4. A non-stick welding detection system according to claim 1, characterized in that: It also includes a fixing mechanism for facilitating gold wire welding, the fixing mechanism including a tensioner, a wire clamp and a porcelain nozzle, and the gold wire delivered by the wire feeding mechanism (1) passes through the tensioner, the wire clamp and the porcelain nozzle in sequence.

5. A non-stick welding detection method using the non-stick welding detection system according to any one of claims 1 to 4, characterized in that: The following steps are involved: A. The host computer (4) sets the number of detection times; B. The wire bonding machine starts welding wires; C. When the detection times are reached, the host computer (4) reads the detection information stored in the control module (2); D. If the detection information contains information that the detection switch (3) is triggered, go to step B; if the detection information does not contain information that the detection switch (3) is triggered, the host computer (4) controls the machine tool to stop working and issues an alarm.

6. A non-stick welding detection method according to claim 5, characterized in that: In step C, the host computer (4) reads the detection information stored in the control module (2), and the host computer (4) is connected to the control module (2) via the communication module (23).

7. A non-stick welding detection method according to claim 5, characterized in that: The information that the detection switch (3) is triggered in step D is the information that the detection switch (3) detects that the gold wire is being transported.

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