Stroke triggering type welding method

Abstract

The invention belongs to the technical field of high-speed wire and terminal welding, and particularly relates to a stroke triggering type welding method which comprises the following steps that S1, an air cylinder stretches out and draws back and drives a moving seat to move in the radial direction, the moving distance of the moving seat is monitored through a displacement sensor, and the displacement sensor outputs monitoring data to a control module; s2, the control module adjusts the telescopic stroke of the air cylinder according to the distance data returned in real time, and the telescopic stroke of the air cylinder is adjusted according to the difference value by comparing the difference value between the real-time distance data and the preset distance data; s3, the control module adjusts the telescopic stroke of the air cylinder in real time according to the real-time data of the displacement sensor, so that the air cylinder drives the movable base and the welding head fixed to the movable base to move, and the welding head reaches the welding position for welding; when the air cylinder drives the welding head to move to the set stroke position, the welding machine triggers welding, the response speed is high, dependence on pressure detection is avoided, and the device is suitable for a high-speed welding production line.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed wire and terminal welding, in particular to a stroke-triggered welding method. Background Art

[0002] Resistance welding is a welding method that uses the resistance heat effect generated by the passage of electric current through the contact surface of the weldment and the adjacent area to heat it to a molten or plastic state, thereby forming a metal joint.

[0003] At present, pressure welding is often used in the welding of high-speed wires and terminals. The current pressure welding head is mainly composed of a pressure spring (providing the load pressure required by the head during the welding process), a pressure sensor (pressure monitoring), an offset spring (offsetting the head's own weight), a linear bearing, a shaft and a pressure welding head. This head mainly confirms the welding status through pressure. The welding force conditions vary greatly, and the welding quality cannot be accurately controlled. In addition, there are the following problems: 1. The pressure sensors currently used in the industry are of low-speed structure. The pressure sensors require calculation conversion and have slow response speeds that cannot meet the data feedback capabilities of high-speed changes. The feedback signal delay causes the change amount after repeated movement to be unable to be accurately measured, and cannot meet the high-speed monitoring feedback requirements. 2. The machine head adopts a spring structure, which has poor follow-up performance during high-speed reciprocating motion. The repeated elastic force accumulation during high-speed reciprocating motion makes it impossible to accurately test the welding pressure value each time; 3. The elastic force of the spring will age and lose with the increasing number of repeated uses. The elastic force of the spring will decay during use, and the spring strength will gradually change. This process must be manually taught and measured; 4. The interval time during rapid repeated use is short, the elastic force is not fully released, the elastic force accumulates, and the accumulated heat affects the elasticity of the spring; 5. The zero point where the upper and lower spring torques are offset belongs to the vacuum state, and the data at this moment cannot be monitored. Summary of the invention

[0004] The purpose of the present invention is to provide a stroke-triggered welding method to solve the technical problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a stroke-triggered welding method, comprising the following steps: S1, the cylinder works to extend and retract and drives the moving seat to move radially. The moving distance of the moving seat is monitored by the displacement sensor, and the displacement sensor outputs the monitoring data to the control module; S2, the control module adjusts the telescopic stroke of the cylinder according to the distance data returned in real time, by comparing the difference between the real-time distance data and the preset distance data, and adjusting the telescopic stroke of the cylinder according to the difference; S3. The control module adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor, so that the cylinder drives the moving seat and the welding head fixed on the moving seat to move, and the welding head reaches the welding position for welding.

[0006] Preferably, in S2, the difference comparison between the real-time distance data and the preset distance data is realized by a difference formula, and the difference formula is: , where is the real-time distance returned by the displacement sensor. is the preset target distance, It is the real-time difference.

[0007] Preferably, adjusting the telescopic stroke of the cylinder according to the difference in S2 includes the following cases: when When the actual position of the moving seat exceeds the preset distance, the cylinder needs to be controlled to retract; when When the actual position of the moving seat does not reach the preset distance, the cylinder needs to be controlled to continue to extend; when When the position of the moving seat is consistent with the preset distance, the control module can maintain the cylinder state.

[0008] Preferably, the control module reads from the displacement sensor at a fixed frequency Data, calculate real-time difference , and adjust the cylinder extension stroke according to the difference.

[0009] Preferably, the control module in S3 adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor. The real-time adjustment method is to automatically adjust the cylinder through proportional control to adjust the extension speed or position of the cylinder. The proportional control formula is: .

[0010] Preferably, in the proportional control formula, is the real-time difference, Reflects the deviation between the current actual position of the cylinder and the target position. If it is a positive error, it means that the cylinder has moved past the target position and needs to be retracted; if it is a negative error, it means that the cylinder has not reached the target position and needs to continue to extend; is the proportional gain coefficient, Determines the system's response strength to the error. The larger the gain, the faster the cylinder adjusts to the error. Can control the response speed and stability of the system; is the control quantity of the cylinder, Directly determines the action of the cylinder, such as the extension speed or position adjustment, control amount and error The larger the error, the greater the control amount, which prompts the cylinder to correct the deviation quickly.

[0011] Preferably, the steps of automatically adjusting the cylinder by proportional control are as follows: A. Real-time error monitoring, displacement sensor collects cylinder position data in real time , and calculate the target position The difference ; B. Generate control signal, according to the proportional control formula: , generating control signals in real time , this signal directly drives the extension and retraction of the cylinder; C. Real-time correction: if the cylinder position exceeds the target (positive error), the system will automatically reduce the cylinder extension or start to retract; if the cylinder position does not reach the target (negative error), the system will automatically increase the extension; D. Gradually approaching the target, as the cylinder position gradually approaches the target, the error Decrease, control signal It also decreases and eventually approaches zero, ensuring that the cylinder can stop stably at the target position.

[0012] Compared with the prior art, the beneficial effects of this application are: The welding head is driven to move by the cylinder, and the displacement sensor detects the stroke position of the welding head in real time. When the welding head moves to the set stroke position, the welder triggers welding. The displacement sensor can achieve micron-level detection, which is particularly suitable for scenarios that require precise control of the welding head stroke. The stroke trigger is based on the welding head displacement, has a fast response speed, and does not rely on pressure detection. It is suitable for high-speed welding production lines and does not directly rely on the hardness or surface characteristics of the material. Therefore, it is suitable for workpieces with large surface differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the logic block diagram of this application. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] Example

[0016] See also Figure 1 , the present application provides a technical solution: a stroke-triggered welding method, comprising the following steps: S1, the cylinder works to extend and retract and drives the moving seat to move radially. The moving distance of the moving seat is monitored by the displacement sensor, and the displacement sensor outputs the monitoring data to the control module; S2, the control module adjusts the telescopic stroke of the cylinder according to the distance data returned in real time, by comparing the difference between the real-time distance data and the preset distance data, and adjusting the telescopic stroke of the cylinder according to the difference; S3. The difference between the real-time distance data and the preset distance data is compared by using the difference formula. The difference formula is: , where is the real-time distance returned by the displacement sensor. is the preset target distance, is the real-time difference; The extension and retraction stroke of the cylinder is adjusted according to the difference, including the following situations: when When the actual position of the moving seat exceeds the preset distance, the cylinder needs to be controlled to retract; when When the actual position of the moving seat does not reach the preset distance, the cylinder needs to be controlled to continue to extend; when When the position of the moving seat is consistent with the preset distance, the control module can maintain the cylinder state; The control module reads the displacement sensor at a fixed frequency (e.g. every 1 millisecond). Data, calculate real-time difference , and adjust the cylinder extension stroke according to the difference; S3. The control module adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor, so that the cylinder drives the moving seat and the welding head fixed on the moving seat to move, and the welding head reaches the welding position for welding.

[0017] In S3, the control module adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor. The real-time adjustment method is to automatically adjust the cylinder through proportional control to adjust the extension speed or position of the cylinder. The formula of proportional control is: , in the proportional control formula, is the real-time difference, Reflects the deviation between the current actual position of the cylinder and the target position. If it is a positive error, it means that the cylinder has moved past the target position and needs to be retracted; if it is a negative error, it means that the cylinder has not reached the target position and needs to continue to extend; is the proportional gain coefficient, Determines the system's response strength to the error. The larger the gain, the faster the cylinder adjusts to the error. Can control the response speed and stability of the system; is the control quantity of the cylinder, Directly determines the action of the cylinder, such as the extension speed or position adjustment, control amount and error The larger the error, the greater the control amount, which prompts the cylinder to correct the deviation quickly.

[0018] The steps for automatic adjustment of the cylinder by proportional control are as follows: A. Real-time error monitoring, displacement sensor collects cylinder position data in real time , and calculate the target position The difference ; B. Generate control signal, according to the proportional control formula: , generating control signals in real time , this signal directly drives the extension and retraction of the cylinder; C. Real-time correction: if the cylinder position exceeds the target (positive error), the system will automatically reduce the cylinder extension or start to retract; if the cylinder position does not reach the target (negative error), the system will automatically increase the extension; D. Gradually approaching the target, as the cylinder position gradually approaches the target, the error Decrease, control signal It also decreases and eventually approaches zero, ensuring that the cylinder can stop stably at the target position.

[0019] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0020] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A stroke-triggered welding method, characterized in that: The following steps are involved: S1, the cylinder works to extend and retract and drives the moving seat to move radially. The moving distance of the moving seat is monitored by the displacement sensor, and the displacement sensor outputs the monitoring data to the control module; S2, the control module adjusts the telescopic stroke of the cylinder according to the distance data returned in real time, by comparing the difference between the real-time distance data and the preset distance data, and adjusting the telescopic stroke of the cylinder according to the difference; S3. The control module adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor, so that the cylinder drives the moving seat and the welding head fixed on the moving seat to move, and the welding head reaches the welding position for welding.

2. A stroke-triggered welding method according to claim 1, characterized in that: In S2, the difference formula is used to compare the difference between the real-time distance data and the preset distance data. The difference formula is: , where is the real-time distance returned by the displacement sensor. is the preset target distance, It is the real-time difference.

3. A stroke-triggered welding method according to claim 2, characterized in that: The step S2 of adjusting the telescopic stroke of the cylinder according to the difference includes the following situations: when When the actual position of the moving seat exceeds the preset distance, the cylinder needs to be controlled to retract; when When the actual position of the moving seat does not reach the preset distance, the cylinder needs to be controlled to continue to extend; when When the position of the moving seat is consistent with the preset distance, the control module can maintain the cylinder state.

4. A stroke-triggered welding method according to claim 3, characterized in that: The control module reads the displacement sensor at a fixed frequency Data, calculate real-time difference , and adjust the cylinder extension stroke according to the difference.

5. A stroke-triggered welding method according to claim 4, characterized in that: The control module in S3 adjusts the cylinder extension stroke in real time according to the real-time data of the displacement sensor. The real-time adjustment method is to automatically adjust the cylinder through proportional control to adjust the extension speed or position of the cylinder. The formula of proportional control is: .

6. A stroke-triggered welding method according to claim 5, characterized in that: In the proportional control formula, is the real-time difference, Reflects the deviation between the current actual position of the cylinder and the target position. If it is a positive error, it means that the cylinder has moved past the target position and needs to be retracted; if it is a negative error, it means that the cylinder has not reached the target position and needs to continue to extend; is the proportional gain coefficient, Determines the system's response strength to the error. The larger the gain, the faster the cylinder adjusts to the error. Can control the response speed and stability of the system; is the control quantity of the cylinder, Directly determines the cylinder's action, control amount and error The larger the error, the greater the control amount, which prompts the cylinder to correct the deviation quickly.

7. A stroke-triggered welding method according to claim 6, characterized in that: The steps for automatic adjustment of the cylinder by proportional control are as follows: A. Real-time error monitoring, displacement sensor collects cylinder position data in real time , and calculate the target position The difference ; B. Generate control signal, according to the proportional control formula: , generating control signals in real time , this signal directly drives the extension and retraction of the cylinder; C. Real-time correction: if the cylinder position exceeds the target, the system will automatically reduce the cylinder extension or start to retract; if the cylinder position does not reach the target, the system will automatically increase the extension; D. Gradually approaching the target, as the cylinder position gradually approaches the target, the error Decrease, control signal It also decreases and eventually approaches zero, ensuring that the cylinder can stop stably at the target position.

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