A precision welding fixture for automotive parts and its measurement and control method

Abstract

This application relates to the field of automotive parts welding, and in particular to a precision welding fixture for automotive parts and its measurement and control method. The precision welding fixture for automotive parts includes a welding bracket mounted on a projection welding machine, the welding bracket being fixedly connected to the projection welding machine and used to place the parts. A detection device is mounted on the welding bracket and fixedly connected to it, used to detect the position of the parts on the welding bracket. The detection device includes a first sensor, a second sensor, and a third sensor. The first and second sensors are used to detect a first welding position of the parts, and the first and third sensors are used to detect a second welding position of the parts. A control center is mounted on the projection welding machine, and the first, second, and third sensors are all connected to the control center. The control center is used to control the welding operation of the projection welding machine, achieving the effect of reducing the scrap rate of automotive parts after welding.

Description

Technical Field

[0001] This application relates to the field of automotive parts welding, and in particular to a fixture for precision welding of automotive parts and a method for metrological control thereof. Background Technology

[0002] Currently, auto parts are the various units that make up a car and the products that serve the car. There are many types of auto parts. As people's living standards improve, people's consumption of cars is also increasing, and the market for auto parts is becoming larger and larger. In recent years, auto parts manufacturers have also been developing rapidly.

[0003] To facilitate connection, existing car seat components often require projection welding of nuts at the openings in the components. This welding is typically done using a projection welding machine. During nut welding, the component is first placed on the welding table of the projection welding machine, then the nut is placed on the component and positioned using a locating pin. The projection welding machine is then started to weld the nut and component together.

[0004] The existing technical solutions mentioned above have the following drawbacks: when there are multiple holes on the parts, and only a few of these holes are welded with nuts, the operator is prone to misplacing the bolts during operation, resulting in a high scrap rate for the bicycle parts after welding. Summary of the Invention

[0005] This application provides a precision welding fixture for automotive parts and its measurement and control method to reduce the scrap rate after welding.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A precision welding fixture for automotive parts includes a welding bracket mounted on a projection welding machine. The welding bracket is fixedly connected to the projection welding machine and is used to place the parts to be welded. A detection device is mounted on the welding bracket and is fixedly connected to the welding bracket. The detection device is used to detect the position of the parts 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, and 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, each of the first, second, and third sensors is provided with an installation device between itself and the welding bracket. The installation device includes an installation plate and installation bolts. The installation plate is fixedly connected to the welding bracket, the installation bolts are fixedly connected to the installation plate, and the installation bolts are threadedly connected to the first, second, or third sensor.

[0010] Furthermore, the projection welding machine is equipped with a metering device, which includes a metering bracket and a storage box. The storage box is placed inside the metering bracket and is used to place the welded parts. The storage box is equipped with a lid, which is slidably connected to the metering bracket and is used to close the storage box. A metering component is provided on the metering bracket and is used to measure the welded parts 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 disposed on both sides of the storage box. Both 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, the top of the metering bracket is provided with a sliding groove, the edge of the box cover is located in the sliding groove, the box cover is slidably connected to the sliding groove, the box cover is also provided with a driving component, one end of the driving component is fixedly connected to the metering bracket, the other end is fixedly connected to the box cover, the driving component is connected to the control center, and the control center is used to control the driving component.

[0013] Furthermore, the driving component 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 and the metering bracket. The movable end of the cylinder is fixedly connected to the box cover.

[0014] Furthermore, the projection welding machine is equipped with a nut feeding device, which includes a feeding pipe and a feeding gun. The feeding pipe is used to transport nuts, and the feeding gun is used to transport the nuts from the port of the feeding pipe to the accessories of the projection welding machine.

[0015] A metrological control method for precision welding of automotive parts, using the aforementioned welding fixture, includes the following steps:

[0016] S1. Measuring the number of welds for a single component: The component is placed on the welding bracket according to the first welding position. The first and second sensors detect that the component is in the accurate welding position and transmit the signal to the control center. The control center starts the feeding gun to feed the nut to the component, and then starts the projection welding machine to weld the nut to the component. At the same time, the number of welds for this component is measured as 1. Then, the component is placed on the welding bracket according to the second welding position. The first and third sensors detect that the component is in the accurate welding position and transmit the signal to the control center. The control center starts the feeding gun to feed the nut to the component, and then starts the projection welding machine to weld the nut to the component. At the same time, the number of welds for this component is measured as 2. When a new component is placed on the welding bracket and detected by the first and second sensors, the number of welds for this component becomes 0.

[0017] S2. Count of components in storage box: When the control center measures the number of welding operations for a single component to reach the design value, the control center activates the drive unit to slide the box cover, opening the storage box and removing the welded component from the welding bracket. The component is then placed inside the storage box. At this time, the component is detected by the metering component, which transmits a signal to the control center. The control center then controls the drive unit to slide the box cover to close the storage box. The number of components in the storage box is then accumulated.

[0018] S3. Counting the total number of parts: When the number of parts 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 installed, the number of parts in the new storage box will be counted again, but the total number of welded parts will be accumulated.

[0019] Furthermore, it also includes the following steps:

[0020] S4. Cumulative Electrode Marking Count: A fourth sensor is installed at the feeding pipe of the nut feeding device. The fourth sensor is connected to the control center. When the fourth sensor detects that the nut has slipped, it transmits a signal to the control center to record the cumulative electrode marking count.

[0021] Furthermore, the projection welding machine is equipped with a display screen, which displays preset welding counts for a single component, the number of components in the storage box, the cumulative total number of components, and the theoretical number of electrode dots, as well as real-time welding counts for a single component, the number of components in the storage box, the cumulative total number of components, and the cumulative number of electrode dots.

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

[0023] 1. By setting up a detection device on the welding bracket and connecting the detection device to the control center, and the control center controlling the welding operation of the projection welding machine, the projection welding machine can only be started to weld the parts when the parts are placed in the correct welding position and welding sequence. This avoids the operator from placing the nuts in the wrong position or welding too few nuts, thus achieving the effect of reducing the scrap rate of automotive parts welding.

[0024] 2. By setting up a metering device, the metering components are used to count the welded parts placed in the storage box and display them on the screen, so as to observe the number of parts placed in the storage box in real time, avoid the operator placing the wrong number of parts into the box, save the step of manual counting later, and improve the production efficiency of welding parts.

[0025] 3. By setting a lid to cover the storage box and installing a drive unit on the lid, and connecting the drive unit to the control center, the control center can directly control the drive unit to open the lid after the two welding positions of the accessory are completed. When the metering component detects that the accessory is placed in the storage box, it directly transmits the signal to the control center, and the control center controls the drive unit to close the storage box, thus preventing debris from falling into the storage box and being falsely detected by the metering component. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a jig for precision welding of automotive parts according to this application;

[0027] Figure 2 yes Figure 1 A magnified view of part A in the middle;

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

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

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

[0031] Figure 6 This is a schematic diagram of the metering component's lid in a closed state in this application;

[0032] Figure 7 This is a schematic diagram of the metering component's lid in the open state.

[0033] In the diagram: 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 component; 531. Transmitter; 532. Receiver; 6. Box cover; 7. Drive component; 71. Support rod; 8. Nut feeding device; 81. Feeding pipe; 82. Feeding gun; 9. Fourth sensor; 10. Display screen; 20. Accessories. Detailed Implementation

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

[0035] Reference Figure 1 and Figure 2 This embodiment provides a precision welding fixture for automotive parts, including a welding bracket 2 mounted on a projection welding machine 1. The welding bracket 2 is fixedly connected to the projection welding machine 1 and is used to place the part 20 to be welded. A detection device 3 is mounted on the welding bracket 2 and is fixedly connected to the welding bracket 2. The detection device 3 is used to detect the position of the part 20 on the welding bracket 2. The first point of welding for the part 20 is located at the projection welding machine 1, at which point the part 20 is in the first welding position (e.g., ...). Figure 2 The second point to be welded for accessory 20 is located at projection welding machine 1, at which point accessory 20 is in the second welding position (e.g., Figure 4 ).

[0036] Reference Figures 2-5 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, and the first sensor 31 and the third sensor 33 are used to detect the second welding position of the accessory 20. The projection welding machine 1 is equipped with a control center. 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 Each of the first sensor 31, the second sensor 32, and the third sensor 33 is provided with an installation device 4 between itself and the welding bracket 2. The installation device 4 includes an installation plate 41 and an installation bolt 42. The installation plate 41 is fixedly connected to the welding bracket 2, and the installation bolt 42 is fixedly connected to the installation plate 41. The installation 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 equipped with a metering device 5, which includes a metering bracket 51 and a storage box 52. The storage box 52 is placed inside the metering bracket 51 and is used to place the welded parts 20. The storage box 52 is equipped with a lid 6, which is slidably connected to the metering bracket 51 and is used to close the storage box 52. A metering component 53 is provided on the metering bracket 51. The metering component 53 is used to measure the welded parts 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. The light curtain sensor 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. The transmitter 531 and the receiver 532 are both fixedly connected to the metering bracket 51. The horizontal position of the transmitter 531 and the receiver 532 is higher than the top of the storage box 52.

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

[0040] Reference Figure 1 The projection welding machine 1 is equipped with a nut feeding device 8, which includes a feeding pipe 81 and a feeding gun 82. The feeding pipe 81 is used to transport nuts, and the feeding gun 82 is used to transport the nuts at the end of the feeding pipe 81 to the accessory 20 of the projection welding machine 1. A fourth sensor 9 is installed at the feeding pipe 81 of the nut feeding device 8. The fourth sensor 9 is connected to the control center. When the fourth sensor 9 detects that a nut has slipped, it transmits a signal to the control center to record the cumulative number of electrode dots. For ease of understanding by those skilled in the art, the nut feeding device 8 in this embodiment also includes a vibrating feeding plate, which is connected to the feeding pipe 81 and is used to transport nuts into the feeding pipe 81. The projection welding machine 1 is also equipped with a display screen 10, which displays preset measurement data and real-time measurement data.

[0041] The implementation principle of a precision welding fixture for automotive parts according to an embodiment of this application is as follows: When using the precision welding fixture, the part 20 to be welded is first placed on the welding bracket 2, so that the first point to be welded on the part 20 is located at the projection welding machine 1. At this time, the part 20 is in the first welding position. The position of the part 20 on the welding bracket 2 is located by the first sensor 31 and the second sensor 32. When both the first sensor 31 and the second sensor 32 detect the accurate position of the part 20, the first sensor 31 and the second sensor 32 transmit signals to the control center. The control center controls the feeding gun 82 of the nut feeding device 8 to transport the nut from the feeding tube 81 to the welding point of the projection welding machine 1. Then, the control center controls the projection welding machine 1 to weld the nut and the accessory 20. After 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 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. 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. 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 drive unit 7 to move the cover 6 along the slide groove inside the metering bracket 51, so that the cover 6 opens the storage box 52. The operator places the welded accessory 20 into 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 to the control center. The control center controls the drive unit 7 to move the cover 6 along the slide groove inside the metering bracket 51, so that the cover 6 seals the storage box 52. The above steps are repeated to continue welding new accessories 20.

[0043] This embodiment also provides a metering control method for precision welding of automotive parts, which uses the above-mentioned welding fixture and includes the following steps:

[0044] S1. Measuring the number of welds for a single component 20: Component 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 component 20 is in the accurate welding position and transmit the signal to the control center. The control center starts the loading gun 82 to feed the nut to component 20, and then starts the projection welding machine 1 to weld the nut to component 20. At the same time, the number of welds for this component 20 is measured as 1. Then, component 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 component 20 is in the accurate welding position and transmit the signal to the control center. The control center starts the loading gun 82. A nut is fed to accessory 20, and then projection welding machine 1 is started to weld the nut to accessory 20. At the same time, the number of welding times for accessory 20 is counted as 2. After welding, accessory 20 is removed and replaced with a new accessory 20. When the new accessory 20 is placed on welding bracket 2 and detected by the first sensor 31 and the second sensor 32, the number of welding times for the new accessory 20 becomes 0. If the operator does not weld in the order of the first welding position and the second welding position, the control center controls projection welding machine 1 to not start welding. Furthermore, if the operator welds the nut at the first welding position but does not weld the second nut, the control center controls projection welding machine 1 to not weld the first welding position of the new accessory 20.

[0045] S2. Count of 20 components in storage box 52: When the control center measures that the number of welds for a single component 20 has reached the design value, the control center activates drive component 7 to slide the lid 6, opening storage box 52. The welded component 20 is then removed from the welding bracket 2 and placed inside storage box 52. At this time, component 20 is detected by light curtain sensor, which transmits a signal to the control center. The control center then controls drive component 7 to slide the lid 6 to close storage box 52. The number of components 20 in storage box 52 is then accumulated. By linking the opening of lid 6 to the number of welds for a single component 20, the operator is reminded that a single component 20 must be welded to the predetermined number of times before it can be placed in storage box 52, preventing operators from over-welding or under-welding, which could result in defective products.

[0046] S3. Accumulated Total Count: When the number of accessories 20 stored in the storage box 52 reaches the preset value, the control center controls the projection welding machine 1 to stop welding. After replacing the storage box 52, the number of accessories 20 in the new storage box 52 is counted again, but the total number of welded accessories 20 will be accumulated. After replacing the storage box 52, a reset button is provided on the metering bracket 51. The reset button is used to reset the data of the number of accessories 20 stored in the storage box 52. The operator presses the reset button to clear the data of the number of accessories 20 stored in the storage box 52 to zero.

[0047] S4. Cumulative electrode marking count: A fourth sensor 9 is installed at the feeding pipe 81 of the nut feeding device 8. The fourth sensor 9 is connected to the control center. When the fourth sensor 9 detects that the nut has slipped, it transmits the signal to the control center and records the cumulative electrode marking count.

[0048] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A metering control method for precision welding of automotive parts, characterized in that, A precision welding fixture for automotive parts is adopted, including a welding bracket (2) set on a projection welding machine (1), the welding bracket (2) is fixedly connected to the projection welding machine (1), the welding bracket (2) is used to place the parts (20) to be welded, and a detection device (3) is set on the welding bracket (2), the detection device (3) is fixedly connected to the welding bracket (2), and the detection device (3) is used to detect the position of the parts (20) on the welding bracket (2); 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). The first sensor (31), the second sensor (32) and the third sensor (33) are all provided with mounting devices (4) between them and the welding bracket (2). The mounting device (4) includes a mounting plate (41) and mounting bolts (42). The mounting plate (41) is fixedly connected to the welding bracket (2), and the mounting bolts (42) are fixedly connected to the mounting plate (41). The mounting bolts (42) are threadedly connected to the first sensor (31), the second sensor (32) or the third sensor (33). The projection welding machine (1) is equipped with a metering device (5), which includes a metering bracket (51) and a storage box (52). The storage box (52) is placed inside the metering bracket (51) and is used to place the welded parts (20). The storage box (52) is equipped with a lid (6), which is slidably connected to the metering bracket (51) and is used to close the storage box (52). The metering bracket (51) is equipped with a metering component (53), which is used to measure the welded parts (20) placed in the storage box (52). The metering component (53) is connected to the control center. The metering control method includes the following steps: S1. Measuring the number of welds for a single component (20): The component (20) is placed on the welding bracket (2) according to the first welding position. The first sensor (31) and the second sensor (32) jointly monitor that the component (20) is in the accurate welding position and transmit the signal to the control center. The control center starts the loading gun (82) to feed the nut to the component (20), and then starts the projection welding machine (1) to weld the nut to the component (20). At the same time, the number of welds for this component (20) is measured as 1. Then the component (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 in the accurate welding position and transmit the signal to the control center. The control center starts the feeding gun (82) to feed the nut to the accessory (20), and then starts the projection welding machine (1) to weld the nut to the accessory (20). At the same time, the welding count of this accessory (20) is 2. When a new accessory (20) is placed on the welding bracket (2) and detected by the first sensor (31) and the second sensor (32), the welding count of this accessory (20) becomes 0. S2, Number of accessories (20) stored in the metering storage box (52): When the control center measures the number of welding times of a single accessory (20) to reach the design value, the control center starts the drive component (7) to drive the box cover (6) to slide. The box cover (6) opens the storage box (52), and the welded accessory (20) is taken off from the welding bracket (2) and placed in the storage box (52). At this time, the accessory (20) is monitored by the metering component (53). The metering component (53) transmits the signal to the control center. The control center controls the drive component (7) to drive the box cover (6) to slide and close the storage box (52). At this time, the number of accessories (20) stored in the storage box (52) is accumulated. S3. Counting the total number of parts: When the number of accessories (20) in the storage box (52) reaches the preset value, the control center controls the projection welding machine (1) to stop welding. When a new storage box (52) is installed, the number of accessories (20) in the new storage box (52) is counted again, but the total number of welded accessories (20) will be accumulated.

2. The metering control method for precision welding of automotive parts according to claim 1, characterized in that, It also includes the following steps: S4. Cumulative electrode marking count: A fourth sensor (9) is installed at the feeding pipe (81) of the nut feeding device (8). The fourth sensor (9) is connected to the control center. When the fourth sensor (9) detects that the nut has slipped, it transmits the signal to the control center and records the cumulative electrode marking count.

3. The metering control method for precision welding of automotive parts according to claim 2, characterized in that: The projection welding machine (1) is equipped with a display screen (10), which displays the preset number of welding times for a single component (20), the number of components (20) in the storage box (52), the cumulative total number of components, and the theoretical number of electrode dots, as well as the real-time number of welding times for a single component (20), the number of components (20) in the storage box (52), the cumulative total number of components, and the cumulative number of electrode dots.

4. The precision welding fixture for automotive parts according to claim 1, characterized in that: The metering component (53) includes a transmitter (531) and a receiver (532). The transmitter (531) and receiver (532) are respectively arranged on both sides of the storage box (52). The transmitter (531) and receiver (532) are fixedly connected to the metering bracket (51). The horizontal position of the transmitter (531) and receiver (532) is higher than the top of the storage box (52).

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

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

7. A precision welding fixture for automotive parts according to claim 6, characterized in that: The projection welding machine (1) is equipped with a nut feeding device (8), which includes a feeding pipe (81) and a feeding gun (82). The feeding pipe (81) is used to transport nuts, and the feeding gun (82) is used to transport the nuts at the port of the feeding pipe (81) to the accessories (20) of the projection welding machine (1).

Images