Jig for precise welding of automobile parts and metering control method of jig

Abstract

The invention relates to the field of automobile part welding, in particular to a jig for precise welding of automobile parts and a metering control method thereof.The jig for precise welding of the automobile parts comprises a welding support arranged on a projection welding machine, the welding support is fixedly connected with the projection welding machine, and the welding support is used for containing the parts; the welding support is provided with a detection device, the detection device is fixedly connected with the welding support, and the detection device is used for detecting the placing position of the accessory on the welding support; the detection device comprises a first sensor, a second sensor and a third sensor, the first sensor and the second sensor are used for detecting the first welding position of the accessory, the first sensor and the third sensor are used for detecting the second welding position of the accessory, and a control center is arranged on the projection welding machine. The first sensor, the second sensor and the third sensor are all connected with the control center, the control center is used for controlling welding operation of the projection welding machine, and the effect of reducing the rejection rate of the welded automobile parts is achieved.

Description

Technical Field

[0001] The present application relates to the field of automobile parts welding, and in particular to a jig for precision welding of automobile parts and a measurement control method thereof. Background Art

[0002] At present, auto parts are the various units that make up the whole car and a kind of product that serves the car. There are many kinds of auto parts. With the improvement of people's living standards, people's consumption of cars is increasing, and the market for auto parts is becoming larger and larger. In recent years, auto parts manufacturers are also developing rapidly.

[0003] To facilitate connection, existing car seat accessories often require projection welding of nuts at the openings of the accessories. This process is typically performed using a projection welding machine. To weld the nuts, the accessory is first placed on the welding table of the projection welding machine. The nut is then placed on the accessory and positioned using locating pins. The projection welding machine is then activated to weld the nut and accessory together.

[0004] The above-mentioned prior art solution has the following defects: when a plurality of holes are provided on an accessory, and nuts are only welded at some of the holes, the operator is likely to misplace the bolts during the operation, resulting in a high scrap rate of the bicycle accessory after welding. Summary of the Invention

[0005] In order to reduce the scrap rate of automobile parts after welding, the present application provides a jig for precise welding of automobile parts and a measurement control method thereof.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] A jig for precision welding of automotive parts, comprising a welding bracket disposed on a projection welding machine, the welding bracket being fixedly connected to the projection welding machine and used to place parts to be welded, and a detection device disposed on the welding bracket, the detection device being fixedly connected to the welding bracket and used to detect the position of the part on the welding bracket;

[0008] The detection device includes a first sensor, a second sensor and a third sensor. The first sensor, the second sensor and the third sensor are all fixedly connected to the welding bracket. The first sensor and the second sensor are used to detect the first welding position of the accessory. The first sensor and the third sensor are used to detect the second welding position of the accessory. A control center is provided on the projection welding machine. The first sensor, the second sensor and the third sensor are all connected to the control center. The control center is used to control the welding operation of the projection welding machine.

[0009] Furthermore, an installation device is provided between the first sensor, the second sensor and the third sensor and the welding bracket, and the installation device includes a mounting plate and a mounting bolt. The mounting plate is fixedly connected to the welding bracket, the mounting bolt is fixedly connected to the mounting plate, and the mounting bolt is threadedly connected to the first sensor, the second sensor or the third sensor.

[0010] Furthermore, the projection welding machine is provided with a metering device, which includes a metering bracket and a storage box. The storage box is placed in the metering bracket, and the storage box is used to place the welded accessories. The storage box is provided with a box cover, and the box cover is slidably connected to the metering bracket. The box cover is used to close the storage box. A metering component is provided on the metering bracket, and the metering component is used to measure the welded accessories placed in the storage box. The metering component is connected to the control center.

[0011] Furthermore, the metering component includes a transmitter and a receiver, which are respectively arranged on both sides of the storage box. The transmitter and the receiver are fixedly connected to the metering bracket, and the horizontal position of the transmitter and the receiver is higher than the top of the storage box.

[0012] Furthermore, a slide groove is provided at the top of the metering bracket, the edge of the box cover is located in the slide groove, the box cover is slidably connected to the slide groove, and the box cover is also provided with a driving member, one end of the driving member is fixedly connected to the metering bracket, and the other end is fixedly connected to the box cover. The driving member is connected to the control center, and the control center is used to control the driving member.

[0013] Furthermore, the driving member is a cylinder, and a support rod is provided between the fixed end of the cylinder and the metering bracket. There are two support rods, both of which are fixedly connected to the fixed end of the cylinder, both of which are fixedly connected to the metering bracket, and the movable end of the cylinder is fixedly connected to the box cover.

[0014] Furthermore, the projection welding machine is provided with a nut feeding device, which includes a feeding pipe and a feeding gun. The feeding pipe is used to convey the nuts, and the feeding gun is used to convey the nuts at the end of the feeding pipe to the accessories of the projection welding machine.

[0015] A metrology control method for precise welding of automotive parts, using the aforementioned welding jig, comprises the following steps:

[0016] S1. Measuring the number of welds of a single accessory: The accessory is placed on the welding bracket according to the first welding position. The first and second sensors detect that the accessory is in the correct welding position and transmit a signal to the control center. The control center activates the loading gun to convey the nut to the accessory, and then activates the projection welder to weld the nut to the accessory. The number of welds of this accessory is measured as 1. The accessory is then placed on the welding bracket according to the second welding position. The first and third sensors detect that the accessory is in the correct welding position and transmit a signal to the control center. The control center activates the loading gun to convey the nut to the accessory, and then activates the projection welder to weld the nut to the accessory. The number of welds of this accessory is measured as 2. When a new accessory is placed on the welding bracket and detected by the first and second sensors, the number of welds of this accessory becomes 0.

[0017] S2. Measuring the number of accessories contained in the storage box: When the control center measures that the number of welding times for a single accessory reaches the designed value, the control center activates the driving component to drive the box cover to slide, the box cover opens the storage box, the welded accessories are removed from the welding bracket, and then placed in the storage box. At this time, the accessories are detected by the metering component, and the metering component transmits a signal to the control center. The control center controls the driving component to drive the box cover to slide and close the storage box. At this time, the number of accessories contained in the storage box is accumulated;

[0018] S3. Measuring the cumulative total number of pieces: When the number of accessories in the storage box reaches the preset value, the control center controls the projection welding machine to stop welding. When a new storage box is replaced, the number of accessories in the new storage box is measured again, but the total number of welded accessories will be accumulated.

[0019] Furthermore, the method further comprises the following steps:

[0020] S4. Measuring the cumulative number of electrode points: A fourth sensor is provided at the feeding pipe of the nut feeding device. The fourth sensor is connected to the control center. The fourth sensor detects the sliding of the nut and transmits the signal to the control center to record the cumulative number of electrode points.

[0021] Furthermore, the projection welding machine is provided with a display screen, which displays the preset number of welding times of a single accessory, the number of accessories contained in the storage box, the cumulative total number of pieces and the theoretical number of electrode points, as well as the real-time number of welding times of a single accessory, the number of accessories contained in the storage box, the cumulative total number of pieces and the cumulative number of electrode points.

[0022] In summary, this application has the following technical effects:

[0023] 1. By installing a detection device on the welding bracket and connecting it to the control center, which controls the welding operation of the projection welder, the projection welder can only be started to weld the parts when the parts are placed in the correct welding position and welding sequence. This prevents operators from misplacing nuts or welding too few nuts, thereby reducing the scrap rate of automotive parts welding.

[0024] 2. By setting up a metering device, the metering component counts the welded accessories placed in the storage box and displays it on the display screen, so as to observe the number of accessories placed in the storage box in real time, avoid the operator placing the wrong number of accessories in the box, save the step of manual counting at a later time, and improve the production efficiency of accessory welding;

[0025] 3. A lid is set to cover the storage box, and a driver is set at the lid, which is then connected to the control center. When the control center finds that both welding positions of the accessory are completed, it directly controls the driver to open the lid. When the metering component detects that the accessory is placed in the storage box, it directly transmits a signal to the control center, which controls the driver to close the storage box to prevent debris from falling into the storage box and being mistakenly detected by the metering component. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a jig for precision welding of automotive parts in this application;

[0027] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0028] Figure 3 is a schematic diagram of the structure of the accessory in contact with the detection device when it is in the first welding position;

[0029] Figure 4 This is a schematic diagram of the structure of the accessory in the second welding position in this application;

[0030] Figure 5 is a schematic diagram of the structure of the accessory in contact with the detection device when it is in the second welding position;

[0031] Figure 6 is a schematic diagram of the box cover of the metering assembly in this application in a closed state;

[0032] Figure 7 This is a schematic diagram of the box cover of the metering component in this application in an open state.

[0033] In the figure, 1. projection welding machine; 2. welding bracket; 3. detection device; 31. first sensor; 32. second sensor; 33. third sensor; 4. mounting device; 41. mounting plate; 42. mounting bolt; 5. metering device; 51. metering bracket; 52. storage box; 53. metering assembly; 531. transmitter; 532. receiver; 6. box cover; 7. driving part; 71. support rod; 8. nut feeding device; 81. feeding pipe; 82. feeding gun; 9. fourth sensor; 10. display screen; 20. accessories. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 1 and Figure 2 The present embodiment provides a jig for precise welding of automobile parts, comprising a welding bracket 2 provided on a projection welding machine 1, the welding bracket 2 being fixedly connected to the projection welding machine 1, the welding bracket 2 being used to place the part 20 to be welded, the welding bracket 2 being provided with a detection device 3, the detection device 3 being fixedly connected to the welding bracket 2, the detection device 3 being used to detect the position of the part 20 placed on the welding bracket 2, the first point of the part 20 to be welded being located at the projection welding machine 1, at which time the part 20 is in the first welding position (e.g., Figure 2 ), the second point of the accessory 20 to be welded is located at the projection welding machine 1, and the accessory 20 is in the second welding position (such as Figure 4 ).

[0036] Reference Figure 2-Figure 5 The detection device 3 includes a first sensor 31, a second sensor 32 and a third sensor 33. The first sensor 31, the second sensor 32 and the third sensor 33 are all fixedly connected to the welding bracket 2. The first sensor 31 and the second sensor 32 are used to detect the first welding position of the accessory 20. The first sensor 31 and the third sensor 33 are used to detect the second welding position of the accessory 20. A control center is provided on the projection welding machine 1. The first sensor 31, the second sensor 32 and the third sensor 33 are all connected to the control center. The control center is used to control the welding operation of the projection welding machine 1.

[0037] Reference Figure 4 A mounting device 4 is provided between the first sensor 31, the second sensor 32 and the third sensor 33 and the welding bracket 2. The mounting device 4 includes a mounting plate 41 and a mounting bolt 42. The mounting plate 41 is fixedly connected to the welding bracket 2, the mounting bolt 42 is fixedly connected to the mounting plate 41, and the mounting bolt 42 is threadedly connected to the first sensor 31, the second sensor 32 or the third sensor 33.

[0038] Reference Figure 6 and Figure 7The projection welding machine 1 is provided with a metering device 5, which includes a metering bracket 51 and a storage box 52. The storage box 52 is placed in the metering bracket 51, and the storage box 52 is used to place the welded accessories 20. The storage box 52 is provided with a box cover 6, which is slidably connected to the metering bracket 51, and the box cover 6 is used to close the storage box 52. A metering component 53 is provided on the metering bracket 51, and the metering component 53 is used to measure the welded accessories 20 placed in the storage box 52. The metering component 53 is connected to the control center; in this embodiment, the metering component 53 is preferably a light curtain sensor, which includes a transmitter 531 and a receiver 532. The transmitter 531 and the receiver 532 are respectively arranged on both sides of the storage box 52, and the transmitter 531 and the receiver 532 are fixedly connected to the metering bracket 51. The horizontal positions of the transmitter 531 and the receiver 532 are higher than the top of the storage box 52.

[0039] Reference Figure 6 and Figure 7 A slide groove is provided at the top of the metering bracket 51, and the edge of the box cover 6 is located in the slide groove. The box cover 6 is slidably connected to the slide groove. The box cover 6 is also provided with a driving member 7, one end of the driving member 7 is fixedly connected to the metering bracket 51, and the other end is fixedly connected to the box cover 6. The driving member 7 is connected to the control center, and the control center is used to control the driving member 7; the driving member 7 is a cylinder, and a support rod 71 is provided between the fixed end of the cylinder and the metering bracket 51. There are two support rods 71, and the two support rods 71 ​​are fixedly connected to the fixed end of the cylinder, and the two support rods 71 ​​are fixedly connected to the metering bracket 51, and the movable end of the cylinder is fixedly connected to the box cover 6.

[0040] Reference Figure 1 The projection welding machine 1 is provided with a nut feeding device 8, which includes a feeding tube 81 and a feeding gun 82. The feeding tube 81 is used to convey nuts, and the feeding gun 82 is used to convey the nuts at the end of the feeding tube 81 to the accessories 20 of the projection welding machine 1; a fourth sensor 9 is provided at the feeding tube 81 of the nut feeding device 8, and the fourth sensor 9 is connected to the control center. The fourth sensor 9 detects the nut sliding and transmits the signal to the control center to record the cumulative number of electrode points. In order to facilitate the understanding of those skilled in the art, the nut feeding device 8 in this embodiment also includes a vibrating feeding tray, which is connected to the feeding tube 81 and is used to convey nuts into the upper feeding tube 81. The projection welding machine 1 is also provided with a display screen 10, which displays preset metering data and real-time metering data.

[0041] The implementation principle of a jig for precision welding of automobile parts in an embodiment of the present application is as follows: when using the precision welding jig, first place the part 20 to be welded on the welding bracket 2, so that the first point of the part 20 to be welded is located at the projection welding machine 1. At this time, the part 20 is in the first welding position, and the first sensor 31 and the second sensor 32 are used to locate the position of the part 20 on the welding bracket 2. When the first sensor 31 and the second sensor 32 both detect the accurate position of the part 20, the first sensor 31 and the second sensor 32 transmit signals to the control center, and the control center controls the feeding gun 82 of the nut feeding device 8 to transport the nut from the feeding pipe 81 to the welding position of the projection welding machine 1. , and then the control center controls the projection welding machine 1 to weld the nut and the accessory 20; when the first position of the accessory 20 is welded, the position of the accessory 20 on the welding bracket 2 is changed so that the second point of the accessory 20 that needs to be welded is located at the projection welding machine 1. At this time, the accessory 20 is in the second welding position. When the first sensor 31 and the third sensor 33 detect that the accessory 20 is in the correct position, the first sensor 31 and the third sensor 33 transmit the signal to the control center, and the control center controls the feeding gun 82 of the nut feeding device 8 to transport the nut from the feeding pipe 81 to the welding position of the projection welding machine 1, and then the control center controls the projection welding machine 1 to weld the nut and the accessory 20, thereby completing the welding of the accessory 20.

[0042] At this time, the control center controls the driving member 7 to drive the box cover 6 to slide along the slide groove in the metering bracket 51, so that the box cover 6 opens the storage box 52, and the operator places the welded accessories 20 in the storage box 52. At this time, the receiver 532 detects that the signal emitted by the transmitter 531 is blocked, and sends the signal here to the control center. The control center controls the driving member 7 to drive the box cover 6 to slide along the slide groove in the metering bracket 51, so that the box cover 6 seals the storage box 52, and repeats the above steps to continue welding new accessories 20.

[0043] This embodiment also provides a measurement control method for precise welding of automotive parts, using the above-mentioned welding fixture, including the following steps:

[0044] S1. Measuring the number of welds of a single accessory 20: The accessory 20 is placed on the welding bracket 2 according to the first welding position. The first sensor 31 and the second sensor 32 detect that the accessory 20 is in the correct welding position and transmit a signal to the control center. The control center starts the loading gun 82 to deliver the nut to the accessory 20, and then starts the projection welding machine 1 to weld the nut and the accessory 20. At the same time, the number of welds of this accessory 20 is measured as 1; then the accessory 20 is placed on the welding bracket 2 according to the second welding position. The first sensor 31 and the third sensor 33 detect that the accessory 20 is in the correct welding position and transmit a signal to the control center. The control center starts the loading gun 82 The nut is delivered to the accessory 20, and then the projection welding machine 1 is started to weld the nut and the accessory 20. At the same time, the number of welding times of the accessory 20 is measured to be 2. The welded accessory 20 is removed and replaced with a new accessory 20. When it is placed on the welding bracket 2 and monitored by the first sensor 31 and the second sensor 32, the number of welding times of the new accessory 20 becomes 0; when the operator does not weld in the order of the first welding position and the second welding position, the control center controls the projection welding machine 1 to be unable to start welding, and when the operator welds the nut at the first welding position but does not weld the second nut, the control center controls the projection welding machine 1 to be unable to weld the first welding position of the new accessory 20.

[0045] S2. Measuring the number of accessories 20 contained in the storage box 52: When the control center measures that the number of welding times of a single accessory 20 reaches the design value, the control center starts the driving member 7 to drive the box cover 6 to slide, the box cover 6 opens the storage box 52, removes the welded accessory 20 from the welding bracket 2, and then places it in the storage box 52. At this time, the accessory 20 is detected by the light curtain sensor, and the light curtain sensor transmits the signal to the control center. The control center controls the driving member 7 to drive the box cover 6 to slide and close the storage box 52. At this time, the number of accessories 20 contained in the storage box 52 is accumulated; by setting the opening of the box cover 6 to be associated with the number of welding times of a single accessory 20, the operator is reminded that a single accessory 20 must be welded a predetermined number of times before it can be placed in the storage box 52, to avoid the operator welding too much or too little and causing waste.

[0046] S3. Measuring the cumulative total number of pieces: When the number of 20 accessories contained in the storage box 52 reaches a preset value, the control center controls the projection welding machine 1 to stop welding. When a new storage box 52 is replaced, the measurement of the number of 20 accessories in the new storage box 52 is restarted, but the total number of 20 welded accessories will be accumulated; after replacing the storage box 52, a reset button is provided on the metering bracket 51, and the reset button is used to reset the data of the number of 20 accessories contained in the storage box 52. The operator presses the reset button to clear the data of the number of 20 accessories contained in the storage box 52.

[0047] S4. Measuring the cumulative number of electrode points: A fourth sensor 9 is provided at the feeding tube 81 of the nut feeding device 8. The fourth sensor 9 is connected to the control center. The fourth sensor 9 detects the nut sliding and transmits the signal to the control center to record the cumulative number of electrode points.

[0048] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A jig for precision welding of automotive parts, characterized by: The invention comprises a welding bracket (2) arranged on a projection welding machine (1), the welding bracket (2) being fixedly connected to the projection welding machine (1), the welding bracket (2) being used to place an accessory (20) to be welded, a detection device (3) being arranged on the welding bracket (2), the detection device (3) being fixedly connected to the welding bracket (2), and the detection device (3) being used to detect the position of the accessory (20) placed on the welding bracket (2); The detection device (3) comprises a first sensor (31), a second sensor (32) and a third sensor (33); the first sensor (31), the second sensor (32) and the third sensor (33) are all fixedly connected to the welding bracket (2); the first sensor (31) and the second sensor (32) are used to detect a first welding position of the accessory (20); the first sensor (31) and the third sensor (33) are used to detect a second welding position of the accessory (20); a control center is provided on the projection welding machine (1); the first sensor (31), the second sensor (32) and the third sensor (33) are all connected to the control center; and the control center is used to control the welding operation of the projection welding machine (1).

2. The jig for precision welding of automotive parts according to claim 1, characterized in that: A mounting device (4) is provided between the first sensor (31), the second sensor (32) and the third sensor (33) and the welding bracket (2). The mounting device (4) comprises a mounting plate (41) and a mounting bolt (42). The mounting plate (41) is fixedly connected to the welding bracket (2), the mounting bolt (42) is fixedly connected to the mounting plate (41), and the mounting bolt (42) is threadedly connected to the first sensor (31), the second sensor (32) or the third sensor (33).

3. The jig for precision welding of automotive parts according to claim 2, characterized in that: The projection welding machine (1) is provided with a metering device (5), which includes a metering bracket (51) and a storage box (52). The storage box (52) is placed in the metering bracket (51), and the storage box (52) is used to place the welded accessories (20). The storage box (52) is provided with a box cover (6), and the box cover (6) is slidably connected to the metering bracket (51). The box cover (6) is used to close the storage box (52). A metering component (53) is provided on the metering bracket (51), and the metering component (53) is used to measure the welded accessories (20) placed in the storage box (52). The metering component (53) is connected to a control center.

4. The jig for precision welding of automotive parts according to claim 3, characterized in that: The metering assembly (53) includes a transmitter (531) and a receiver (532), the transmitter (531) and the receiver (532) being respectively arranged on both sides of the storage box (52), the transmitter (531) and the receiver (532) being fixedly connected to the metering bracket (51), and the horizontal positions of the transmitter (531) and the receiver (532) being higher than the top of the storage box (52).

5. The jig for precision welding of automotive parts according to claim 4, characterized in that: The top of the metering bracket (51) is provided with a slide groove, the edge of the box cover (6) is located in the slide groove, the box cover (6) is slidably connected to the slide groove, and the box cover (6) is also provided with a driving member (7), one end of the driving member (7) is fixedly connected to the metering bracket (51), and the other end is fixedly connected to the box cover (6), and the driving member (7) is connected to a control center, and the control center is used to control the driving member (7).

6. The jig for precision welding of automotive parts according to claim 5, characterized in that: The driving member (7) is a cylinder, and a support rod (71) is provided between the fixed end of the cylinder and the metering bracket (51). Two support rods (71) are provided, and both support rods (71) are fixedly connected to the fixed end of the cylinder, and both support rods (71) are fixedly connected to the metering bracket (51). The movable end of the cylinder is fixedly connected to the box cover (6).

7. The jig for precision welding of automotive parts according to claim 7, characterized in that: The projection welding machine (1) is provided with a nut feeding device (8), which comprises a feeding pipe (81) and a feeding gun (82). The feeding pipe (81) is used for conveying nuts, and the feeding gun (82) is used for conveying the nuts at the end of the feeding pipe (81) to the accessories (20) of the projection welding machine (1).

8. A measurement control method for precise welding of automobile parts, using the welding jig according to claims 1-7, characterized in that: The following steps are involved: S1. Measuring the number of welding times of a single accessory (20): The accessory (20) is placed on the welding bracket (2) according to the first welding position. The first sensor (31) and the second sensor (32) jointly detect that the accessory (20) is in the correct welding position and transmit the signal to the control center. The control center starts the feeding gun (82) to deliver the nut to the accessory (20), and then starts the projection welding machine (1) to weld the nut and the accessory (20). At the same time, the number of welding times of this accessory (20) is measured as 1. Then, the accessory (20) is placed on the welding bracket (2) according to the second welding position. On the welding bracket (2), the first sensor (31) and the third sensor (33) simultaneously detect that the accessory (20) is located at the accurate welding position and transmit the signal to the control center. The control center starts the feeding gun (82) to transport the nut to the accessory (20), and then starts the projection welding machine (1) to weld the nut and the accessory (20). At the same time, the number of welding times of this accessory (20) is measured as 2. When a new accessory (20) is placed on the welding bracket (2) and is detected by the first sensor (31) and the second sensor (32), the number of welding times of this accessory (20) becomes 0. S2. Measuring the number of accessories (20) contained in the storage box (52): When the control center measures that the number of welding times of a single accessory (20) reaches the design value, the control center starts the driving member (7) to drive the box cover (6) to slide, the box cover (6) opens the storage box (52), removes the welded accessory (20) from the welding bracket (2), and then places it in the storage box (52). At this time, the accessory (20) is detected by the metering component (53), and the metering component (53) transmits a signal to the control center. The control center controls the driving member (7) to drive the box cover (6) to slide and close the storage box (52). At this time, the number of accessories (20) contained in the storage box (52) is accumulated; S3. Measuring the total number of accumulated pieces: When the number of accessories (20) contained in the storage box (52) reaches a preset value, the control center controls the projection welding machine (1) to stop welding. When a new storage box (52) is replaced, the number of accessories (20) in the new storage box (52) is measured again, but the total number of welded accessories (20) is accumulated.

9. A measurement control method for precise welding of automobile parts according to claim 8, characterized in that: The following steps are also included: S4. Measuring the cumulative number of electrode points: A fourth sensor (9) is provided at the feeding pipe (81) of the nut feeding device (8). The fourth sensor (9) is connected to the control center. The fourth sensor (9) detects the sliding of the nut and transmits the signal to the control center to record the cumulative number of electrode points.

10. The measurement control method for precise welding of automobile parts according to claim 9, characterized in that: The projection welding machine (1) is provided with a display screen (10), which displays the preset welding times of a single accessory (20), the number of accessories (20) contained in the storage box (52), the cumulative total number of pieces and the theoretical number of electrode points, as well as the real-time welding times of a single accessory (20), the number of accessories (20) contained in the storage box (52), the cumulative total number of pieces and the cumulative number of electrode points.

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