Pressure monitoring system and method for body-in-white welding clamp

Abstract

The invention relates to a pressure monitoring system and method for a body-in-white welding clamp, and the method comprises the steps: installing a part into the clamp, and pushing the upper part of the clamp for clamping; when the magnetic switch is turned on, the pressure sensor has readings; after the pressure value reaches a set value, welding is started; along with the change of the clamping state, the surface pressure of the lower clamp is changed, and the reading of the pressure sensor is changed again; the pressure is monitored, and compared with a theoretical value, the magnetic force is increased when the pressure is small; the pressure value is proper and the magnetic force is maintained; pressure is large and magnetic force is reduced. If the pressure is too large or zero, the sensor gives an alarm, welding is stopped, and the position of the clamp or the part is manually adjusted; after welding is completed, the magnetic switch is disconnected, and the upper clamp is opened. According to the pressure monitoring method applied to the body-in-white welding clamp, the magnetic attraction control device and the pressure sensor are adopted to construct the pressure monitoring method applied to the body-in-white welding clamp, the clamping state of the clamp in the welding process can be accurately controlled, the body welding process is optimized, the body size precision is improved, and the obvious effect on improving the automobile quality is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile body-in-white manufacturing, and in particular relates to a pressure monitoring system and method for a body-in-white welding fixture. Background Art

[0002] At present, welding technology is a commonly used technical means in the process of automobile body-in-white manufacturing. The welding fixture generally consists of two parts: the upper and lower fixtures. In the existing technology, the clamping is generally performed manually, and the manual adjustment is made based on experience to check the clamping state and the clamping force.

[0003] Due to manual experience-based pressing and debugging, improper pressing or debugging under the current technical system may cause problems such as part deformation or fracturing (excessive pressing force) and weld cracking (insufficient pressing), which directly affect the dimensional accuracy of the body in white.

[0004] Based on this, there is an urgent need to develop a pressure monitoring system and method for the body-in-white welding fixture to effectively solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a pressure monitoring system for a body-in-white welding fixture, and also to provide a pressure monitoring method for a body-in-white welding fixture, so as to solve the problem that parts displacement or insufficient clamping force is easily generated during the welding process, affecting the dimensional accuracy of the body-in-white.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A pressure monitoring system for a body-in-white welding fixture, comprising a welding fixture, an electromagnet control device and a pressure sensor 4;

[0008] The welding fixture is composed of an upper fixture 1 and a lower fixture 2. The welding parts are loaded between the upper fixture 1 and the lower fixture 2. The upper fixture 1 can move under the action of external force to clamp the welding parts together with the lower fixture 2.

[0009] The electromagnet control device is an electromagnet 3 installed in the upper clamp 1. When powered on, it can change the magnitude of the magnetic force and adjust the clamping force to keep stable during welding.

[0010] The surface of the lower clamp 2 is provided with a pressure sensor 4, which can monitor the pressure state of the surface of the positioning block of the lower clamp 2, thereby monitoring the clamping condition of the welding parts.

[0011] Furthermore, the electromagnet 3 is composed of two pieces and is installed at the diagonal positions of the upper fixture 1 .

[0012] Furthermore, the electromagnet 3 is embedded into the positioning block of the upper fixture 1 from the non-contact surface.

[0013] Furthermore, the pressure sensor 4 is embedded in the center of the positioning block of the lower fixture 2, and the surface is flush.

[0014] Furthermore, the welding parts are positioned and fixed by positioning pins of the welding fixture and supported and clamped by positioning blocks.

[0015] A pressure monitoring method for a body-in-white welding fixture comprises the following steps:

[0016] A. Load the welding parts into the upper clamp 1 and the lower clamp 2, and manually pull the upper clamp 1 and the lower clamp 2 to clamp;

[0017] B. Turn on the magnetic switch, the electromagnet 3 in the upper fixture 1 is energized to generate magnetic force, and the pressure sensor 4 on the surface of the lower fixture 2 generates a reading, indicating that the fixture is in contact and pressed tightly. If the sensor does not indicate a reading, the fixture position needs to be manually adjusted;

[0018] C. After the pressure reaches the set value, welding begins;

[0019] D. As the clamping state changes, the surface pressure of the lower clamp 2 changes, and the indication of the pressure sensor 4 changes again;

[0020] E. The welding process is monitored in real time. When the pressure value is lower than the specified value, the magnetic force of the electromagnet 3 increases, and the clamping force increases; when the pressure value is moderate, the magnetic force is maintained; when the pressure value exceeds the specified value, the magnetic force of the electromagnet 3 decreases, and the clamping force decreases. If the pressure is too high or zero, the sensor alarms, the welding is stopped, and the position of the fixture or parts can be manually adjusted;

[0021] F. After welding is completed, disconnect the magnetic switch, reset the fixture, and open the upper fixture 1.

[0022] Furthermore, in step A, after the clamping action is performed, the pressure sensor 4 has an indication.

[0023] Further, in step E, the specified value is a theoretical value.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention adopts a magnetic control device and a pressure sensor to construct a pressure monitoring method applied to the body-in-white welding fixture, which can accurately control the clamping state of the fixture during welding, optimize the body welding process, and improve the body size accuracy, which has a significant effect on improving the quality of the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A flow chart of the steps of the pressure monitoring method of the body-in-white welding fixture of the present invention;

[0028] Figure 2 A schematic structural diagram of a pressure monitoring system for a body-in-white welding fixture of the present invention.

[0029] In the figure, 1. upper fixture 2. lower fixture 3. electromagnet 4. pressure sensor. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with embodiments:

[0031] The pressure monitoring system of the body-in-white welding fixture of the present invention is composed of a welding fixture, an electromagnet control device and a pressure sensor 4. The fixture is composed of an upper fixture 1 and a lower fixture 2, which can move under external force to clamp the welding parts.

[0032] The electromagnet control device is an electromagnet 3, which is composed of two pieces and is installed on the upper clamp 1, specifically at the diagonal position of the upper clamp 1. The electromagnet 3 is embedded in the positioning block of the upper clamp 1 from the non-contact surface. When the electromagnet 3 is energized, the magnetic force can be changed to adjust the clamping force to remain stable during welding.

[0033] The surface of the lower fixture 2 is provided with a pressure sensor 4, which is embedded in the center of the positioning block of the lower fixture 2 and has a flush surface. The pressure sensor 4 can monitor the pressure state of the positioning block surface of the lower fixture 2, thereby monitoring the clamping condition of the welding parts.

[0034] The pressure monitoring method of the body-in-white welding fixture of the present invention comprises the following steps:

[0035] Step 1: Load the welding parts into the upper clamp 1 and the lower clamp 2, and manually pull the upper clamp 1 and the lower clamp 2 to clamp;

[0036] Because the welding fixture is usually a group or a set, composed of multiple positioning pins, positioning blocks or other fixtures. The welding parts are positioned and fixed by the positioning pins, and the positioning blocks play a role of supporting and clamping. Therefore, the clamping and fixing of the welding parts by the welding fixture will not be described in detail. In the present invention, the upper clamp 1 can be opened and clamped, and the lower clamp 2 is always fixed. Step two, turn on the magnetic switch, the electromagnet 3 in the upper clamp 1 is energized to generate magnetic force, and the pressure sensor 4 on the surface of the lower clamp 2 generates a reading, indicating that the clamp is in contact and pressed. If the sensor has no reading, the clamp position needs to be manually adjusted;

[0037] Step 3: After the pressure value reaches the set value, start welding;

[0038] Step 4: As the clamping state changes, the surface pressure of the lower clamp 2 changes, and the indication of the pressure sensor 4 changes again;

[0039] Step 5: The welding process is monitored in real time. When the pressure value is lower than the specified value, the magnetic force of the electromagnet 3 increases and the clamping force increases. When the pressure value is moderate, the magnetic force is maintained. When the pressure value exceeds the specified value, the magnetic force of the electromagnet 3 decreases and the clamping force decreases. If the pressure is too high or zero, the sensor alarms, the welding is stopped, and the position of the fixture or parts can be manually adjusted.

[0040] Step 6. After welding is completed, disconnect the magnetic switch and open the upper clamp 1.

[0041] Since multiple positioning blocks of the same type in the fixture are debugged and carried out according to the same method and steps, and other parts such as positioning pins and pliers are debugged according to the traditional mode, they are not elaborated in detail in the present invention.

[0042] Example 1

[0043] A pressure monitoring system for a body-in-white welding fixture is composed of an upper fixture 1, a lower fixture 2, an electromagnet control device, and a pressure sensor 4. The welding part is loaded between the upper fixture 1 and the lower fixture 2, the upper fixture 1 does not move, and the lower fixture 2 can move under the action of an external force to clamp the welding part.

[0044] The electromagnet control device is two electromagnets 3 installed at the diagonal positions of the upper clamp 1. The electromagnet 3 is embedded in the positioning block of the upper clamp 1 from the non-contact surface. When the electromagnet 3 is energized, the magnetic force can be changed to adjust the clamping force to keep stable during welding.

[0045] The surface of the lower clamp 2 is equipped with a pressure sensor 4, which can monitor the pressure state of the surface of the positioning block of the lower clamp 2, thereby monitoring the clamping condition of the welding parts. The pressure sensor 4 is embedded in the center of the positioning block of the lower clamp 2, and the surface is flush.

[0046] The welding parts are positioned and fixed by the positioning pins of the welding fixture and supported and clamped by the positioning blocks.

[0047] Example 2

[0048] A pressure monitoring method for a body-in-white welding fixture comprises the following steps:

[0049] Step 1: Place the welding parts between the upper clamp 1 and the lower clamp 2, manually pull the upper clamp 1, push the upper clamp 1 and the lower clamp 2 to engage, perform the clamping action, and the pressure sensor 4 will indicate a value;

[0050] Step 2: Turn on the magnetic switch, the electromagnet 3 in the upper clamp 1 is energized to generate magnetic force, and the pressure sensor 4 on the surface of the lower clamp 2 generates a reading, indicating that the clamp is in contact and pressed tightly. If the sensor does not indicate a reading, the position of the clamp needs to be manually adjusted;

[0051] Step 3: After the pressure value reaches the ideal position, start welding;

[0052] Step 4: the clamping state changes, the surface pressure of the lower clamp 2 changes, and the indication of the pressure sensor 4 changes again;

[0053] Step 5: monitor the pressure in real time during the welding process and compare it with the theoretical value. When the pressure value is lower than the theoretical value, the magnetic force of the electromagnet 3 increases and the clamping force increases; when the pressure value is moderate, the magnetic force is maintained; after the pressure value exceeds the theoretical value, the magnetic force of the electromagnet 3 decreases and the clamping force decreases.

[0054] If the pressure is too high or zero, the sensor will alarm, stop welding, and consider manually adjusting the fixture or part position;

[0055] Step 6: Monitor the pressure. After welding is completed, disconnect the magnetic switch, reset the clamp, and open the upper clamp 1.

[0056] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pressure monitoring system for a body-in-white welding fixture, characterized in that: It is composed of a welding fixture, an electromagnet control device and a pressure sensor (4); The welding fixture is composed of an upper fixture (1) and a lower fixture (2). The welding parts are loaded between the upper fixture (1) and the lower fixture (2). The upper fixture (1) can be moved under the action of an external force to clamp the welding parts together with the lower fixture (2). The electromagnet control device is an electromagnet (3) installed in the upper clamp (1) and capable of changing the magnitude of the magnetic force when powered on, so as to adjust the clamping force to remain stable during the welding process; The surface of the lower clamp (2) is provided with a pressure sensor (4) which can monitor the pressure state of the surface of the positioning block of the lower clamp (2), thereby monitoring the clamping condition of the welding parts.

2. The pressure monitoring system for a body-in-white welding fixture according to claim 1, characterized in that: The electromagnets (3) consist of two pieces, which are installed at the diagonal positions of the upper fixture (1).

3. The pressure monitoring system for a body-in-white welding fixture according to claim 2, characterized in that: The electromagnet (3) is embedded into the positioning block of the upper fixture (1) from the non-contact surface.

4. The pressure monitoring system for a body-in-white welding fixture according to claim 1, characterized in that: The pressure sensor (4) is embedded in the center of the positioning block of the lower clamp (2) with the surface flush.

5. The pressure monitoring system for a body-in-white welding fixture according to claim 1, characterized in that: The welding parts are positioned and fixed by the positioning pins of the welding fixture and supported and clamped by the positioning blocks.

6. A pressure monitoring method for a body-in-white welding fixture, characterized in that: The following steps are involved: A. Place the welding parts into the upper clamp (1) and the lower clamp (2), and manually pull the upper clamp (1) and the lower clamp (2) to clamp them; B. Turn on the magnetic switch, the electromagnet (3) in the upper clamp (1) is energized to generate magnetic force, and the pressure sensor (4) on the surface of the lower clamp (2) generates a reading, indicating that the clamp is in contact and pressed tightly. If the sensor does not indicate a reading, the position of the clamp needs to be adjusted manually; C. After the pressure reaches the set value, welding begins; D. As the clamping state changes, the surface pressure of the lower clamp (2) changes, and the reading of the pressure sensor 4 changes again; E. The welding process is monitored in real time. When the pressure value is lower than the specified value, the magnetic force of the electromagnet (3) increases and the pressing force increases; when the pressure value is moderate, the magnetic force is maintained; When the pressure value exceeds the specified value, the magnetic force of the electromagnet (3) decreases and the clamping force decreases. If the pressure is too large or zero, the sensor alarms, welding is stopped, and manual adjustment of the fixture or part position is considered; F. After welding is completed, disconnect the magnetic switch, reset the clamp, and open the upper clamp (1).

7. The pressure monitoring method of a body-in-white welding fixture according to claim 6, characterized in that: Step A, after the clamping action is performed, the pressure sensor (4) has an indication.

8. The pressure monitoring method of a body-in-white welding fixture according to claim 6, characterized in that: Step E: The specified value is a theoretical value.

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