A flexible positioning fixture and welding tooling for an automotive sill

Abstract

The present invention discloses a flexible positioning fixture and a welding tooling for an automotive sill. The flexible positioning fixture for the automotive sill includes a fixture bracket, a positioning assembly, and a clamping assembly. The fixture bracket is used for fixedly mounting on the welding tooling. The positioning assembly includes a positioning member and a driving member. The positioning member is movably mounted on the fixture bracket and is used for abutting against and limiting the first side surface of the automotive sill. The driving member is drivingly connected to the positioning member and is used for driving the positioning member to move. The clamping assembly is mounted on the fixture bracket. The clamping assembly includes a plurality of clamping portions, and the plurality of clamping portions are used for abutting against and limiting the second side surface of the automotive sill. The positioning member has a plurality of positioning positions in its moving stroke. At different positioning positions, the positioning member is used for being able to abut against and limit the first side surface of automotive sills of different models. By driving the positioning member to move at different positioning positions through the driving member, flexible switching is realized, which can be adapted to automotive sills of different models, and the number of fixtures is reduced, and the structure is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of fixture tooling, and particularly relates to a flexible positioning fixture and welding tooling for an automobile sill. Background Art

[0002] The positioning fixtures for the left and right front sills of an automobile are fixtures for splicing and positioning the left and right front sills with the front cabin assembly, the front floor assembly, and the rear floor assembly. The existing solution adopts a structure in which the main and auxiliary positioning pins of the sill and the Y-direction support & clamping of the sill are separately designed. When the vehicle model is switched, the entire front sill fixture needs to be switched as a whole, and flexible sharing between vehicle models cannot be achieved.

[0003] The following problems are likely to occur with this setting. The number of POSTs of the front sill positioning fixture is relatively large. The main and auxiliary positioning mostly adopts a fixed pin + multi-group fixed cylinder clamping mechanism to achieve positioning for multiple vehicle models, and the fixture occupies a large space; the front sill positioning fixture is complex, and the robot needs to jump the gun multiple times to avoid the fixture for welding, and the single-station CT (cycle time) is long; the front sill positioning fixture is heavy, increasing the cost and service life of the first-stage slide cylinder, and the debugging and maintenance costs are high; since the front sill fixture needs to be switched as a whole, it is necessary to additionally add a front sill fixture storage rack, a front sill fixture switching tooling, and a tool-side switching disk at the station. Summary of the Invention

[0004] The main object of the present invention is to propose a flexible positioning fixture and welding tooling for an automobile sill, aiming to solve the technical problem that the existing sill positioning fixture has a complex structure and cannot be flexibly switched.

[0005] To achieve the above object, a flexible positioning fixture for an automobile sill proposed by the present invention is arranged on a welding tooling for clamping an automobile sill. The automobile sill has a first side surface and a second side surface in a first direction. The flexible positioning fixture for an automobile sill includes:

[0006] A fixture bracket for fixedly installing on the welding tooling;

[0007] A positioning assembly including a positioning member and a driving member. The positioning member is movably installed on the fixture bracket for abutting against and limiting the first side surface of the automobile sill, and the driving member is drivingly connected to the positioning member for driving the positioning member to move; and,

[0008] A clamping assembly installed on the fixture bracket. The clamping assembly includes a plurality of clamping portions for abutting against and limiting the second side surface of the automobile sill;

[0009] Wherein, the positioning member has a plurality of positioning positions in its moving stroke. At different positioning positions, the positioning member can abut against and limit the first side surface of different models of the automobile sill.

[0010] Optionally, positioning holes running through in the first direction are provided on the vehicle sill, the positioning member includes a positioning pin extending in the first direction, the positioning pin is movably arranged in the first direction, and a limiting portion is arranged along the circumferential direction of the positioning pin;

[0011] Wherein, the positioning pin is used to pass through the positioning hole, and the limiting portion is used to abut against the first side surface of the vehicle sill so that the vehicle sill is limited in the first direction.

[0012] Optionally, the positioning member includes a hook pin cylinder, the positioning pin is arranged on one side of the hook pin cylinder in the first direction, a movable catch is arranged in the positioning pin, and the catch has a protruding position protruding from the positioning pin and a retracted position retracted into the positioning pin during its movement stroke;

[0013] Wherein, when the catch is in the protruding position, the catch is located on the side of the limiting portion away from the hook pin cylinder so that the limiting portion and the catch are respectively used to abut against the first side surface and the second side surface of the vehicle sill.

[0014] Optionally, at least two positioning members are provided, and at least two driving members are provided corresponding to the two positioning members;

[0015] Wherein, the two positioning members are used to be arranged at intervals along the length direction of the vehicle sill.

[0016] Optionally, the positioning assembly further includes a plurality of limiting blocks, the plurality of limiting blocks are installed on the fixture bracket and are used to be arranged along the circumferential direction of the vehicle sill, one end surface of the limiting block in the first direction is a limiting surface, and the limiting surface is used to abut against and limit the first side surface of the vehicle sill.

[0017] Optionally, the plurality of limiting blocks include a plurality of fixed limiting blocks and a plurality of movable limiting blocks, the fixed limiting blocks are fixedly installed on the fixture bracket, a plurality of driving members are provided, and the plurality of driving members are correspondingly drivingly connected to the plurality of movable limiting blocks and the positioning member to drive the movable limiting blocks to be movably arranged in the first direction.

[0018] Optionally, the driving member includes a telescopic cylinder, and the plurality of telescopic cylinders are respectively drivingly connected to the positioning member and the plurality of limiting blocks to drive them to make reciprocating movements in the first direction.

[0019] Optionally, the clamping portion includes a clamping block, the clamping block is movably installed on the fixture bracket and moves along the direction close to and away from the limiting block, and a clamping surface is provided at one side end of the clamping block close to the limiting surface;

[0020] Wherein, when the clamping block moves in the direction close to the limiting block, the limiting surface and the clamping surface are respectively used for abutting against the first side surface and the second side surface of the vehicle sill.

[0021] Optionally, the clamping portion further includes a driving cylinder, the driving cylinder is drivingly connected with a rotating portion for driving the rotating portion to rotate, and the clamping block is fixedly installed on the rotating portion;

[0022] The rotating portion has a clamping position and an open position in its moving stroke. When the rotating portion moves towards the clamping position, the clamping block moves in the direction close to the limiting block. When the rotating portion moves towards the open position, the clamping block moves in the direction away from the limiting block.

[0023] The present invention also provides a welding tooling, the welding tooling includes the above-mentioned flexible positioning fixture for vehicle sill, and this flexible positioning fixture for vehicle sill is arranged on the welding tooling for clamping the vehicle sill. The vehicle sill has a first side surface and a second side surface in a first direction. The flexible positioning fixture for vehicle sill includes:

[0024] A fixture bracket for fixedly installing on the welding tooling;

[0025] A positioning assembly, including a positioning member and a driving member, the positioning member is movably installed on the fixture bracket for abutting against and limiting the first side surface of the vehicle sill, and the driving member is drivingly connected with the positioning member for driving the positioning member to move; and,

[0026] A clamping assembly, installed on the fixture bracket, the clamping assembly includes a plurality of clamping portions, and the plurality of clamping portions are used for abutting against and limiting the second side surface of the vehicle sill;

[0027] Wherein, the positioning member has a plurality of positioning positions in its moving stroke, and at different positioning positions, the positioning member is used for being able to abut against and limit the first side surface of vehicle sills of different models.

[0028] In the technical solution of the present invention, the flexible positioning fixture for the vehicle sill includes a fixture bracket, a positioning component, and a clamping component. The fixture bracket is used for fixedly installing on the welding fixture. The positioning component includes a positioning member and a driving member. The positioning member is movably installed on the fixture bracket and is used for abutting against and limiting the first side surface of the vehicle sill. The driving member is drivingly connected to the positioning member and is used for driving the positioning member to move. The clamping component is installed on the fixture bracket. The clamping component includes a plurality of clamping parts, and the plurality of clamping parts are used for abutting against and limiting the second side surface of the vehicle sill. The positioning member has a plurality of positioning positions in its moving stroke. At different positioning positions, the positioning member can abut against and limit the first side surface of different models of vehicle sills. When installing the vehicle sill onto the flexible positioning fixture for the vehicle sill, generally, the first side surface is first abutted against the positioning component to realize the position positioning of the vehicle sill, and then the second side surface is abutted against by the clamping component to fix the vehicle sill. When dealing with different models of vehicle sills, the positioning positions are also different. The driving member drives the positioning member to be movably arranged on the fixture bracket. When assembling different models of vehicle sills, the positioning member can be moved to the positioning position corresponding to the corresponding model of vehicle sill, realizing that one positioning member can correspond to multiple positioning positions, thereby reducing the number of positioning fixtures, and a set of positioning fixtures can achieve flexible switching of the fixture positions corresponding to different models of vehicle sills. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0030] Figure 1 FIG. is a schematic structural diagram of an embodiment of the flexible positioning fixture for the vehicle sill provided by the present invention;

[0031] Figure 2 is Figure 1 a partial structural diagram of the first unit in;

[0032] Figure 3 is Figure 1 a partial structural diagram of the second unit in;

[0033] Figure 4 is Figure 1 a partial structural diagram of the third unit in;

[0034] Figure 5 For Figure 1 the partial structural schematic diagram of the fourth unit and the fifth unit in

[0035] Explanation of the reference numerals in the attached drawings:

[0036]

[0037]

[0038] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0041] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The left and right front sill positioning fixtures of an automobile are fixtures for splicing and positioning the left and right front sills, the front cabin assembly, the front floor assembly, and the rear floor assembly. The existing solution adopts a structure in which the main and auxiliary positioning pins of the sill and the Y-direction support & clamping of the sill are designed separately. When the vehicle model is switched, the entire front sill fixture needs to be switched as a whole, and the flexible sharing between vehicle models cannot be achieved.

[0043] This setting is prone to the following problems: there are a large number of POSTs in the front threshold positioning fixture. For the main and auxiliary positioning, a fixed pin + multiple groups of fixed cylinder clamping mechanisms are mostly used to achieve positioning for multiple vehicle models, and the fixture occupies a large space; the front threshold positioning fixture is complex, and the robot needs to jump the gun multiple times to avoid the fixture for welding, resulting in a long single-station CT (cycle time); the front threshold positioning fixture is heavy, increasing the cost and service life of the first-stage slide cylinder, and the debugging and maintenance costs are high; since the front threshold fixture needs to be switched as a whole, it is necessary to additionally add a front threshold fixture storage rack, a front threshold fixture switching tooling, and a tool-side switching disk at the station.

[0044] In view of this, the present invention proposes a flexible positioning fixture for an automotive threshold, aiming to solve the technical problems that the existing threshold positioning fixture has a complex structure and cannot be flexibly switched.

[0045] In an embodiment of the present invention, the flexible positioning fixture for an automotive threshold is arranged on a welding fixture and is used to clamp the automotive threshold. The automotive threshold has a first side and a second side in a first direction. The flexible positioning fixture for an automotive threshold includes a fixture bracket 1000, a positioning component, and a clamping component. The fixture bracket 1000 is used for fixed installation on the welding fixture; the positioning component includes a positioning member 1 and a driving member 2. The positioning member 1 is movably installed on the fixture bracket 1000 and is used to abut against and limit the first side of the automotive threshold. The driving member 2 is drivingly connected to the positioning member 1 and is used to drive the positioning member 1 to move; the clamping component is installed on the fixture bracket 1000. The clamping component includes a plurality of clamping parts 4. The plurality of clamping parts 4 are used to abut against and limit the second side of the automotive threshold; wherein, the positioning member 1 has a plurality of positioning positions in its moving stroke. At different positioning positions, the positioning member 1 is used to be able to abut against and limit the first side of different models of the automotive threshold.

[0046] It should be noted that when installing the vehicle sill to the flexible positioning fixture of the vehicle sill, generally, the first side is first abutted against the positioning component to achieve the position positioning of the vehicle sill, and then the clamping component abuts against the second side to fix the vehicle sill. When dealing with vehicle sills of different models, the positioning positions are also different. In the technical solution of the present invention, the driving member 2 drives the positioning member 1 to be movably arranged on the fixture bracket 1000. When assembling vehicle sills of different models, the positioning member 1 can be moved to the positioning position corresponding to the vehicle sill of the corresponding model, realizing that one positioning member 1 can correspond to multiple positioning positions, thereby reducing the number of positioning fixtures, and a set of positioning fixtures can achieve flexible switching of the fixture positions corresponding to vehicle sills of different models. To improve the positioning accuracy, multiple positioning members 1 can be provided, and the multiple positioning members 1 are distributed along the extending direction of the vehicle sill.

[0047] It can be understood that the moving direction of the positioning member 1 can be multi-directional movement, including front-back, up-down, and left-right directions, set according to vehicle sills of different models. And to achieve the light weight of the fixture tooling, the positioning position of the vehicle sill can be set to minimize the complexity of the movement of the positioning member 1, thereby reducing the complexity of the driving member 2. Specifically, in this embodiment, the first direction is along the left-right direction, and at the same time, the first direction is also the thickness direction of the vehicle sill.

[0048] Further, a positioning hole penetrating along the first direction is provided on the vehicle sill, the positioning member 1 includes a positioning pin 12 extending along the first direction, the positioning pin 12 is movably arranged in the first direction, and a limiting portion 13 is arranged on the positioning pin 12 along its circumferential direction; wherein, the positioning pin 12 is used to penetrate into the positioning hole, and the limiting portion 13 is used to abut against the first side surface of the vehicle sill so as to limit the vehicle sill in the first direction. In this embodiment, the positioning member 1 includes a positioning pin 12 extending along the first direction. By penetrating the positioning pin 12 into the positioning hole on the vehicle sill, the vehicle sill is circumferentially positioned. By arranging the limiting portion 13 along the circumferential direction of the positioning pin 12, the limiting portion 13 abuts against the first side surface, so as to limit the vehicle sill in the first direction. By setting the position of the positioning hole of the vehicle sill, when vehicle sills of different models are installed on the flexible positioning fixture of the vehicle sill, the positioning holes of vehicle sills of each model are coaxially arranged. However, the depth positions of the positioning holes of vehicle sills of each model in the first direction are different. Therefore, by setting the positioning pin 12 to be movably arranged in the first direction, only by adjusting the position of the positioning pin 12 in the first direction, vehicle sills of each model can be positioned, with a simple structure and small occupied space.

[0049] It should be noted that the specific form of the limiting portion 13 is not specifically limited herein. In this embodiment, the limiting portion 13 is an annular protrusion. In other embodiments, as long as the limiting portion 13 is a protrusion structure capable of abutting against the vehicle sill.

[0050] Further, in order to reduce the number of jigs and simplify the structure, the positioning member 1 includes a hook pin cylinder 11. The positioning pin 12 is arranged on one side of the hook pin cylinder 11 in the first direction. A latch that can be movably arranged is provided inside the positioning pin 12. The latch has an extended position where it extends out of the positioning pin 12 and a retracted position where it is received inside the positioning pin 12 during its movement stroke. Wherein, when the latch is in the extended position, the latch is located on the side of the limiting portion 13 away from the hook pin cylinder 11, so that the limiting portion 13 and the latch are respectively used to abut against the first side surface and the second side surface of the vehicle door sill. When clamping, first adjust the position of the hook pin cylinder 11 corresponding to the model of the vehicle door sill. When clamping the vehicle door sill, the vehicle door sill first aligns the positioning holes thereon with the positioning pins 12 for circumferential positioning. The positioning pins 12 penetrate through the positioning holes of the vehicle door sill, and the first side surface abuts against the limiting portion 13, so that the vehicle door sill is limited in the first direction. Then, through the cylinder action of the hook pin cylinder 11, the latch is pushed out of the positioning pin 12. The latch opens along the circumference of the positioning pin 12 and abuts against the second side surface, realizing clamping and limiting of the vehicle door sill through the limiting portion 13 and the latch.

[0051] In the technical solution of the present invention, in order to further increase the clamping force to improve the positioning accuracy of the vehicle door sill, an auxiliary clamping device is further provided at the position of the positioning pin 12 of the vehicle door sill flexible positioning jig. Specifically, it is a clamping cylinder 5. The clamping cylinder 5 drives the clamping portion to move in the first direction. The clamping portion is used to abut against the second side surface, and the vehicle door sill is further clamped through the cooperation of the clamping portion and the limiting portion 13. It can be understood that when the hook pin cylinder 11 is not used and only the positioning pin 12 is used, the main clamping effect can be achieved through the cooperation of the clamping portion and the limiting portion 13.

[0052] Generally, the length of the vehicle door sill is relatively long. If only one positioning member 1 is provided, it is very likely that the positioning deviation will occur due to the deformation of the vehicle door sill. In this embodiment, at least two positioning members 1 are provided, and the driving member 2 is provided with at least two corresponding to the two positioning members 1. Among them, the two positioning members 1 are arranged at intervals along the length direction of the vehicle door sill. The vehicle door sill is positioned by at least two positioning members 1 to improve the positioning accuracy and clamping stability.

[0053] In an embodiment of the present invention, the positioning assembly further includes a plurality of limit blocks 3. The plurality of limit blocks 3 are installed on the fixture bracket 1000 and are arranged circumferentially along the vehicle sill. One end face of the limit block 3 in the first direction is a limiting surface, and the limiting surface is used to abut and limit against the first side surface of the vehicle sill. The vehicle sill is likely to be provided with a plurality of flanges and mounting surfaces. The plurality of limit blocks 3 are used to assist the positioning member 1 in positioning and limiting the vehicle sill, so as to ensure the stability during welding.

[0054] Further, the plurality of limit blocks 3 include a plurality of fixed limit blocks 31 and a plurality of movable limit blocks 32. The fixed limit blocks 31 are fixedly installed on the fixture bracket 1000. There are a plurality of driving members 2, and the plurality of driving members 2 are correspondingly drivingly connected to the plurality of movable limit blocks 32 and the positioning member 1 to drive the movable limit blocks 32 to be movably arranged in the first direction. In the technical solution of the present invention, the plurality of limit blocks 3 can be respectively set corresponding to different models of the vehicle sill, and are set according to the shapes of different models of the vehicle sill to ensure the limiting effect on each vehicle sill. Among them, the plurality of fixed limit blocks 31 are fixedly installed on the fixture bracket 1000. By setting their positions according to the shapes of the vehicle sills of each model, different fixed limit blocks 31 may be used to specifically correspond to different models of the vehicle sill. At the same time, when installing vehicle sills of other models, the fixed limit blocks 31 will not cause interference. Each movable limit block 32 may correspond to multiple models of the vehicle sill, and its limiting position is changed by driving the movable limit block 32 by the driving member 2.

[0055] In an embodiment of the present invention, there are two models of the vehicle sill. Therefore, in one embodiment, the driving member 2 includes a telescopic cylinder 21. The plurality of telescopic cylinders 21 are respectively drivingly connected to the positioning member 1 and the plurality of limit blocks 3 to drive them to make reciprocating motions in the first direction. When there are a plurality of positioning members 1, the plurality of telescopic cylinders 21 are also correspondingly arranged for the plurality of positioning members 1. It can be understood that the telescopic cylinder 21 has two action positions. The positioning member 1 or the limit block 3 is driven by the telescopic cylinder 21 to move between the two action positions to correspond to two different models of the vehicle sill. In another embodiment, when the number of models of the vehicle sill exceeds two, the driving member 2 can also be a driving device such as a linear motor that can drive along a straight line and has a plurality of positioning positions in its moving direction to correspond to more models of the vehicle sill.

[0056] It should be noted that the limiting block 3 is a protruding structure provided on the fixture bracket 1000, which can be circular, square or other polygons. The limiting surface is used to abut against the first side surface. The specific shape of the limiting surface is not limited here either. It can be a flat surface, or can be set to an arc or an irregular shape according to the shape of the corresponding abutting vehicle sill. At the same time, the limiting surface can also be made into a frosted surface, or a certain pattern is provided on the surface to increase its friction and improve the stability of the limit.

[0057] In the embodiment of the present invention, the clamping portion 4 includes a clamping block 42. The clamping block 42 is movably installed on the fixture bracket 1000 and moves in the direction close to and away from the limiting block 3. A clamping surface is provided at one end of the clamping block 42 close to the limiting surface. Wherein, when the clamping block 42 moves close to the limiting block 3, the limiting surface and the clamping surface are respectively used to abut against the first side surface and the second side surface of the vehicle sill. The clamping and fixing of the vehicle sill is realized by the cooperation of the clamping block 42 and the limiting block 3. A plurality of clamping blocks 42 are provided, and the plurality of clamping blocks 42 are arranged corresponding to the plurality of limiting blocks 3. It should be noted that not every limiting block 3 is provided with a corresponding clamping block 42, as long as it is ensured that the clamping block 42 can effectively clamp and fix the vehicle sill, so as to avoid too many fixtures and reduce the investment in tooling and equipment. It can be understood that the setting method of the clamping surface is similar to the setting method of the limiting surface described above.

[0058] Further, the clamping portion 4 further includes a driving cylinder 41. The driving cylinder 41 is drivingly connected to a rotating portion for driving the rotating portion to rotate. The clamping block 42 is fixedly installed on the rotating portion. The rotating portion has a clamping position and an open position in its moving stroke. When the rotating portion moves towards the clamping position, the clamping block 42 moves in the direction close to the limiting block 3. When the rotating portion moves towards the open position, the clamping block 42 moves in the direction away from the limiting block 3. The rotation of the rotating portion is driven by the driver to drive the clamping block 42 to rotate to realize clamping and opening. When clamping the vehicle sill, first control the rotating portion to move to the open position. At this time, the fixture bracket 1000 moves so that the positioning member 1 and the limiting block 3 abut against the first side surface to realize positioning. It should be noted that when the clamping block 42 is in the open position, it will not interfere with the vehicle sill when the fixture bracket 1000 moves as a whole. After the vehicle sill is positioned, the driving cylinder 41 drives the rotating portion to rotate to drive the clamping block 42 to move to the clamping position, so that the clamping block 42 abuts against the second side surface to clamp and fix the vehicle sill.

[0059] It should be further noted that a plurality of clamping blocks 42 are provided, and a plurality of driving cylinders 41 and driving parts are correspondingly provided for the clamping blocks 42. For different models of the vehicle sill, the number of the clamping parts 4 to be actuated is different, which is determined according to specific settings. Among them, the rotating part is a connecting piece for rigidly connecting the clamping block 42 and the output end of the driving cylinder 41. The specific shape of the connecting piece is not limited as long as the structure and material of the connecting piece meet the strength required for clamping.

[0060] Please refer to Figures 1 to 5 , which is a specific embodiment of the flexible positioning fixture for the vehicle sill provided by the present invention. In this embodiment, there are mainly two models of the vehicle sill corresponding to models A and B. Later, the vehicle sills corresponding to models A and B will be simply referred to as model A and model B. Among them, the flexible positioning fixture for the vehicle sill divides the positioning assembly and the clamping assembly into multiple units, which are successively the first unit 100, the second unit 200, the third unit 300, the fourth unit 400, and the fifth unit 500 along the length direction of the vehicle sill. Among them, the first unit 100 and the third unit 300 drive the movable limit block 32 through the fixed limit block 31 and the telescopic cylinder 21 to realize the switching and avoidance of models A and B; the fifth unit 500 is dedicated to model B and drives the movable limit block 32 through the telescopic cylinder 21 to realize the avoidance of model A; the second unit 200 and the fourth unit 400 drive the hook cylinder 11 through the telescopic cylinder 21 and the movable limit block 32, and the telescopic cylinder 21 to realize the switching and avoidance of models A and B.

[0061] When producing Model A vehicles, the vehicle identification number information of Model A is obtained from the previous process, and the PLC controls the flexible positioning fixture for the vehicle sill to switch to the Model A state. The first clamping part 101 (dedicated for Model A), the second clamping part 102, and the third clamping part 103 (dedicated for Model A) of the first unit 100 are all in the open state; the telescopic cylinder 21 of the second unit 200 is in the clamping state, and the hook cylinder 11 moves together with the telescopic cylinder 21. The clamping cylinder 5 and the hook cylinder 11 are both in the open state (at this time, the hook of the positioning pin 12 is in the retracted position). The first limit block 201 (dedicated for Model A) and the second limit block 202 (dedicated for Model B) are the fixed limit blocks 31; the telescopic cylinder 21 of the third unit 300 is in the clamping state, and the third limit block 301 (dedicated for Model B) is the movable limit block 32 that moves together with the telescopic cylinder 21. The fourth limit block 302 (dedicated for Model A), the fifth limit block 303 (dedicated for Model A), the sixth limit block 304 (dedicated for Model A), and the seventh limit block 305 (dedicated for Model B) are all the fixed limit blocks 31; the telescopic cylinder 21 of the fourth unit 400 is in the clamping state, and the hook cylinder 11 moves together with the telescopic cylinder 21. The eighth limit block 401 (dedicated for Model A) and the ninth limit block 402 (dedicated for Model A) are the fixed limit blocks 31; the telescopic cylinder 21 of the fifth unit 500 is in the clamping state, and the tenth limit block 501 (dedicated for Model B) is the movable limit block 32 that moves together with the telescopic cylinder 21. The eleventh limit block 502 (dedicated for Model B) is the fixed limit block 31, and the flexible positioning fixture for the vehicle sill is in the state of waiting for the workpiece to be installed.

[0062] The manual fixture for gripping the vehicle sill places the vehicle sill of Model A on the flexible positioning fixture for the vehicle sill. When the sensor detects the vehicle sill, the hook cylinders 11 of the second unit 200 and the fourth unit 400 clamp, and the vehicle sill of Model A is positioned on the fixture. Subsequently, the flexible positioning fixture for the vehicle sill and the vehicle sill travel to the working position with the sliding table. After the sliding table is in place, the first clamping part 101 (dedicated for Model A) and the third clamping part 103 (dedicated for Model A) of the first unit 100 of the front sill fixture clamp, the second clamping part 102 (dedicated for Model B) is in the open state, and the clamping cylinder 5 clamps, completing the connection and positioning of the vehicle sill and the vehicle body. Subsequently, the robot performs positioning welding. After the welding is completed, the hook cylinders 11 of the second unit 200 and the fourth unit 400 open, the first clamping part 101 (dedicated for Model A) and the third clamping part 103 (dedicated for Model A) of the first unit 100 open, the clamping cylinder 5 opens, and the flexible positioning fixture for the vehicle sill slides to the workpiece loading position with the sliding table.

[0063] When producing Model B, the vehicle identification number information of Model B is obtained from the previous process, and the PLC controls the flexible positioning fixture for the vehicle sill to switch to the state of Model B. The first clamping part 101 (for Model A only), the second clamping part 102, and the third clamping part 103 (for Model A only) of the first unit 100 are all opened; the telescopic cylinder 21 of the second unit 200 is in the open state, the detent cylinder 11 moves together with the telescopic cylinder 21, the clamping cylinder 5 and the detent cylinder 11 are both in the open state, the first limit block 201 (for Model A only) and the second limit block 202 (for Model B only) are the fixed limit block 31; the telescopic cylinder 21 of the third unit 300 is in the open state, the third limit block 301 (for Model B only) moves together with the telescopic cylinder 21, the fourth limit block 302 (for Model A only), the fifth limit block 303 (for Model A only), the sixth limit block 304 (for Model A only), and the seventh limit block 305 (for Model B only) are all the fixed limit block 31; the telescopic cylinder 21 of the fourth unit 400 is in the open state, the detent cylinder 11 moves together with the telescopic cylinder 21, the eighth limit block 401 (for Model A only) and the ninth limit block 402 (for Model A only) are the fixed limit block 31; the telescopic cylinder 21 of the fifth unit 500 is in the open state, the tenth limit block 501 (for Model B only) moves together with the telescopic cylinder 21, the eleventh limit block 502 (for Model B only) is the fixed limit block 31, and the flexible positioning fixture for the vehicle sill is in the state of waiting for the workpiece to be installed.

[0064] The manual fixture for grasping the vehicle sill places the vehicle sill of Model B on the flexible positioning fixture for the vehicle sill. When the sensor detects the vehicle sill, the detent cylinders 11 of the second unit 200 and the fourth unit 400 clamp, and the vehicle sill is positioned on the fixture. Subsequently, the flexible positioning fixture for the vehicle sill and the vehicle sill travel to the working position with the sliding table. After the sliding table is in place, the second clamping part 102 (for Model B only) of the first unit 100 clamps, the first clamping part 101 (for Model A only) and the third clamping part 103 (for Model A only) are in the open state, the clamping cylinder 5 clamps, and the connection and positioning between the vehicle sill and the vehicle body are completed. Subsequently, the robot performs positioning welding. After the welding is completed, the detent cylinders 11 of the second unit 200 and the fourth unit 400 are opened, the second clamping part 102 (for Model B only) is opened, the clamping cylinder 5 is opened, and the flexible positioning fixture for the vehicle sill slides to the workpiece loading position with the sliding table.

[0065] The flexible positioning fixture for the car sill provided by the present invention has the purposes of simple structure, small occupied space, light weight, high flexibility and wide application range. At the same time, the implementation of the present invention can reduce the investment in tooling and equipment. It simplifies the space occupied by the positioning fixture, facilitates the welding trajectory of the robot, improves the welding beat (reduces the number of gun skipping), reduces the weight of the positioning fixture, and increases the service life of the sliding table mechanism.

[0066] In addition, the present invention also provides a welding tooling, and the welding tooling includes the flexible positioning fixture for the car sill. It can be understood that since the welding tooling of the present invention adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one.

[0067] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields are all included in the patent protection scope of the present invention.

Claims

1. A flexible positioning fixture for an automotive sill, which is arranged on a welding fixture and used to clamp the automotive sill. The automotive sill has a first side and a second side in a first direction. It is characterized in that, The flexible positioning fixture for the vehicle sill includes: A fixture bracket for fixedly mounting on the welding fixture; A positioning assembly including a positioning member and a driving member. The positioning member is movably mounted on the fixture bracket and is used to abut against and limit the first side of the vehicle sill. The driving member is drivingly connected to the positioning member to drive the positioning member to move; and, A clamping assembly mounted on the fixture bracket. The clamping assembly includes a plurality of clamping portions, and the plurality of clamping portions are used to abut against and limit the second side of the vehicle sill; Wherein, the positioning member has a plurality of positioning positions in its moving stroke. At different positioning positions, the positioning member can abut against and limit the first side of different models of the vehicle sill; A positioning hole extending through in the first direction is provided on the vehicle sill. It is characterized in that the positioning member includes a positioning pin extending in the first direction. The positioning pin is movably arranged in the first direction, and a limiting portion is provided on the positioning pin along its circumferential direction; Wherein, the positioning pin is used to penetrate into the positioning hole, and the limiting portion is used to abut against the first side of the vehicle sill so as to limit the vehicle sill in the first direction; At least two positioning members are provided, and at least two driving members are provided corresponding to the two positioning members; Wherein, the two positioning members are arranged at intervals along the length direction of the vehicle sill; The positioning assembly further includes a plurality of limiting blocks. The plurality of limiting blocks are mounted on the fixture bracket and are used to be arranged circumferentially along the vehicle sill. One end surface of the limiting block in the first direction is a limiting surface, and the limiting surface is used to abut against and limit the first side of the vehicle sill.

2. The flexible positioning fixture for the car sill according to claim 1, characterized in that, The positioning member includes a hook cylinder, the positioning pin is arranged on one side of the hook cylinder in the first direction, and a movable hook is arranged in the positioning pin. The hook has a protruding position protruding from the positioning pin and a retracted position retracted into the positioning pin in its moving stroke; Wherein, when the hook is in the protruding position, the hook is located on the side of the limiting portion away from the hook cylinder, so that the limiting portion and the hook are respectively used to abut against the first side and the second side of the vehicle sill.

3. The flexible positioning fixture for the automotive sill according to claim 1, wherein, The plurality of limiting blocks include a plurality of fixed limiting blocks and a plurality of movable limiting blocks. The fixed limiting blocks are fixedly mounted on the fixture bracket. A plurality of driving members are provided, and the plurality of driving members are drivingly connected to the plurality of movable limiting blocks and the positioning member respectively to drive the movable limiting blocks to be movably arranged in the first direction.

4. The flexible positioning fixture for the car sill according to claim 3, characterized in that, The driving member includes a telescopic cylinder. The plurality of telescopic cylinders are respectively drivingly connected to the positioning member and the plurality of limiting blocks to drive them to make reciprocating movements in the first direction.

5. The flexible positioning fixture for the car sill according to claim 3, characterized in that, The clamping portion includes a clamping block. The clamping block is movably mounted on the fixture bracket and moves along the direction close to and away from the limiting block. A clamping surface is provided at one end of the clamping block close to the limiting surface; Wherein, when the clamping block moves in a direction close to the limiting block, the limiting surface and the clamping surface are respectively used to abut against the first side surface and the second side surface of the vehicle sill.

6. The flexible positioning fixture for the car sill according to claim 5, characterized in that, The clamping part further includes a driving cylinder, which is drivingly connected with a rotating part to drive the rotating part to rotate, and the clamping block is fixedly installed on the rotating part; The rotating part has a clamping position and an opening position in its moving stroke. When the rotating part moves towards the clamping position, the clamping block moves in a direction close to the limiting block. When the rotating part moves towards the opening position, the clamping block moves in a direction away from the limiting block.

7. A welding tooling, characterized in that, It includes a flexible positioning fixture for vehicle sills according to any one of claims 1 to 6.

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