A limiting and clamping structure for machining die-cast parts of new energy vehicle battery boxes

Abstract

This invention relates to the field of machining positioning mechanism technology, specifically proposing a limiting clamping structure for machining die-cast battery boxes for new energy vehicles; it includes a positioning moving stage and four side clamping assemblies; the positioning moving stage is used to place the die-cast battery box and can move in the horizontal and vertical directions; the four side clamping assemblies are all fixed on the positioning moving stage and are used to clamp the die-cast battery box on the four outer surfaces of the die-cast battery box; this invention solves the problems of uncertain and inconsistent clamping force, deviation in positioning accuracy, and coupling interference between clamping and positioning in existing fixtures that use synchronous positioning during clamping by decoupling clamping and positioning, thereby improving the stability and positioning accuracy of clamping the die-cast battery box and thus improving the machining quality of the die-cast battery box.

Description

Technical Field

[0001] This invention relates to the field of machining positioning mechanism technology, and specifically proposes a limiting clamping structure for machining die-cast parts of new energy vehicle battery boxes. Background Technology

[0002] Automotive battery box die castings, also known as battery trays, are used to hold and support automotive batteries. They are typically manufactured using die casting, and automotive battery box die castings are generally thin-walled die castings. After die casting, they still require machining such as datum surface milling, mounting surface milling, and drilling and tapping of assembly holes. Effective clamping and limiting before machining is an important step to prevent the battery box die casting from moving or misaligning during machining and to ensure machining accuracy. Under current technology, corresponding limiting fixtures are used for clamping and positioning. The limiting fixtures mainly achieve clamping through the cooperation of multiple clamping plates or clamping blocks. In order to reduce the clamping deformation caused by rigid clamping to the battery box die casting, existing methods often use elastic adaptive clamping instead of rigid clamping. However, there are still shortcomings in terms of clamping limiting accuracy and clamping stability.

[0003] First, the clamping force at multiple elastic adaptive clamping positions is uncertain and inconsistent. When the clamping force is too large, it will cause the die-cast battery box to deform and the positioning will be basically misaligned after processing. When the clamping force is insufficient, it cannot effectively fix the die-cast battery box, resulting in insufficient stability during processing and easy misalignment.

[0004] Secondly, after the elastic adaptive clamping and positioning, the die-cast battery box may not be in the accurate machining reference position. If positioning correction is used, it is easier to cause deviations in the clamping force of each clamping position.

[0005] Furthermore, while die casting offers high precision, and non-mounting surfaces that do not affect assembly accuracy generally do not require milling, and can even be used as clamping surfaces to accommodate machining clearances, the die-cast battery box is relatively thin. During the die-casting cooling and solidification process, uneven cooling shrinkage inevitably causes random local warping deformation, affecting the flatness of the clamping surface. Existing fixtures generally use surface contact clamping with the contact surface fixed after clamping. When the clamping plate or block clamps into contact with the protruding part, the protrusion makes a top-down contact, while the concave part experiences incomplete contact, resulting in insufficient clamping force. Localized clamping stress concentration and uneven clamping force distribution significantly affect the actual clamping and limiting effect, also causing local deformation of the die-cast battery box, affecting machining stability and accuracy. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a limiting and clamping structure for the processing of die-cast parts for new energy vehicle battery boxes, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention employs the following technical solution: a limiting clamping structure for processing die-cast battery boxes for new energy vehicles, comprising a positioning moving stage and four side clamping assemblies; the positioning moving stage is used to place the die-cast battery box and can move horizontally and vertically; the four side clamping assemblies are all fixed on the positioning moving stage and are used to clamp the four outer surfaces of the die-cast battery box accordingly; the side clamping assemblies include an execution component and a side clamping part; the execution component includes a sliding base horizontally slidably mounted on the positioning moving stage and a travel plate fixed to the top of the sliding base; the side clamping part includes a guide plate slidably mounted on the travel plate along the sliding direction of the sliding base, and a matrix clamping plate is vertically driven and slidably mounted on the guide plate; the guide plate and the travel plate are connected by an elastic preload... The clamping mechanism consists of elastic components that apply clamping force; a matrix clamping plate is equipped with multiple ejector pins arranged in a rectangular array and distributed pressure sensors that contact all ejector pins. All ejector pins are used to clamp the die-cast battery box. The distributed pressure sensors detect the contact force of the ejector pins, and the matrix clamping plate adaptively slides to adjust the clamping contact position based on the contact force feedback. A limiting component is installed between the matrix clamping plate and the sliding base to limit the elastic preload. Two positioning blocks are provided on the positioning moving stage to cooperate with two adjacent side clamping assemblies for machining reference correction. After the four side clamping assemblies have clamped the die-cast battery box, they move laterally and longitudinally through the positioning moving stage, so that the two side clamping assemblies are in rigid contact with the corresponding positioning blocks for reference correction positioning.

[0008] Preferably, the matrix clamp includes a back plate vertically slidably mounted on a guide plate and an ejector pin seat fixed on the back plate; ejector pins are detachably mounted on the ejector pin seats; a distributed pressure sensor is fixed on the back plate and used to detect the ejector pin contact force threshold; the ejector pins horizontally penetrate the ejector pin seat and one end contacts the distributed pressure sensor; when the distributed pressure sensor detects that the contact force of any ejector pin exceeds the threshold, the back plate slides until the contact force of any ejector pin is within the threshold.

[0009] Preferably, the limiting component includes an insert block and a stop seat; the insert block is vertically slidably mounted on the guide plate; the stop seat is horizontally slidably mounted on the sliding base; and the stop seat has an insertion hole for the lower end of the insert block to be inserted.

[0010] Preferably, the ejector pin seat has a plurality of ejector pin holes arranged in a rectangular array; the ejector pin component includes an ejector pin sleeve, an ejector pin that slides in the ejector pin sleeve, and a compression spring sleeved on the ejector pin; the ejector pin passes through the ejector pin seat and one end contacts the distributed pressure sensor, the ejector pin sleeve is threadedly installed in the ejector pin hole, and the compression spring is limited by the ejector pin and installed in the ejector pin hole.

[0011] Preferably, the insert block is horizontally rotatably mounted with a roller protruding from its lower end face; the limiting component also includes a top contact block fixed on the positioning moving platform; when the sliding base moves to reset, the roller makes rolling contact with the top contact block, and the top contact block moves the insert block out of the insertion hole through the top contact roller.

[0012] Preferably, the actuation component further includes an actuation cylinder horizontally fixed on the positioning moving stage, and a force sensor fixed between the output end of the actuation cylinder and the stroke plate; a plurality of guide posts horizontally slidably mounted on the stroke plate are fixed on the guide plate; the elastic element is a pre-tension spring, and a plurality of pre-tension springs are fixed between the stroke plate and the guide plate.

[0013] Preferably, the stiffness of the compression spring is greater than the stiffness of the preload spring.

[0014] Preferably, the ejector seat sidewalls of the two side clamp assemblies that cooperate with the positioning block are each fixed with a backing plate, which is used to make rigid positioning contact with the corresponding positioning block.

[0015] Preferably, one end of the ejector pin is movably embedded with a ball bearing that makes rolling contact with the outer wall of the die-cast battery box.

[0016] The above technical solution has the following advantages or beneficial effects: This invention provides a limiting clamping structure for processing die-cast battery boxes for new energy vehicles. Through the cooperation of four side clamping assemblies, the die-cast battery box can be clamped from four sides. The side clamping assemblies ensure the reasonableness of the clamping force for specific battery box die-cast parts by adjusting the clamping force limit and automatically limiting and locking during clamping. This avoids insufficient clamping force affecting processing stability, while also preventing excessive clamping force from deforming the die-cast part and affecting processing accuracy. The side clamping assemblies actively adjust the clamping contact surface to avoid local... The clamping stress is concentrated while the local clamping force is insufficient, thus ensuring the uniformity of the clamping force distribution. In addition, based on the completion of four-sided clamping, the rigid positioning with the machining positioning datum is achieved through active movement. This invention solves the problems of uncertain and inconsistent clamping force, deviation in positioning accuracy, and coupling interference between clamping and positioning in existing fixtures that use synchronous positioning during clamping by decoupling the clamping action and the datum positioning action. This improves the stability and positioning accuracy of clamping battery box die castings, thereby improving the machining quality of battery box die castings. Attached Figure Description

[0017] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings, which are not intentionally drawn to scale; the focus is on illustrating the spirit of the invention.

[0018] Figure 1This is a three-dimensional structural diagram of a limiting and clamping structure for machining die-cast parts of new energy vehicle battery boxes.

[0019] Figure 2 This is a front view of a limiting and clamping structure for machining die-cast parts of new energy vehicle battery boxes.

[0020] Figure 3 This is a state diagram of a limit clamping structure for processing die-cast battery boxes for new energy vehicles, after the die-cast battery box has been clamped on all four sides.

[0021] Figure 4 This is a three-dimensional structural diagram of the side clamp assembly.

[0022] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0023] Figure 6 It is a three-dimensional structural diagram of the assembly and cooperation of the sliding base, insert block, stop seat and guide plate.

[0024] Figure 7 It is a three-dimensional structural diagram of the assembly of the insert and the roller.

[0025] Figure 8 This is a three-dimensional structural diagram of the stop seat.

[0026] In the diagram: 1. Positioning moving stage; 11. Workpiece stage; 12. Positioning block; 13. Attaching plate; 2. Actuation component; 21. Actuation cylinder; 22. Force sensor; 23. Stroke plate; 24. Sliding base; 3. Side clamping component; 31. Guide plate; 32. Guide post; 33. Preload spring; 4. Matrix clamping plate; 41. Back plate; 42. Ejector seat; 421. Ejector hole; 43. Ejector piece; 431. Ejector sleeve; 432. Ejector; 433. Ball bearing; 434. Compression spring; 5. Limiting component; 51. Insertion block; 52. Roller; 53. Stop seat; 531. Insertion hole; 54. Top contact block; 6. Battery box die casting. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 and Figure 3As shown, a machining limiting clamping structure for a new energy vehicle battery box die-casting part 6 includes a positioning moving stage 1. The positioning moving stage 1 can move horizontally and vertically, which correspond to the X-axis and Y-axis directions in the Cartesian coordinate system, respectively. The positioning moving stage 1 is a conventional sliding table structure, and the specific structure will not be described in detail here. The sliding in both the X-axis and Y-axis directions can be driven by cylinders. The top surface of the positioning moving stage 1 is fixed with bolts to a workpiece table 11 for placing the battery box die-casting part 6. The workpiece table 11 is a square table surface.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the top surface of the positioning moving stage 1 is equipped with four side clamping assemblies for clamping onto the four outer surfaces of the battery box die-casting 6. The four side clamping assemblies are distributed around the workpiece stage 11 and are arranged opposite to the four sides of the workpiece stage 11. The positioning moving stage 1 is equipped with two positioning blocks 12 that cooperate with two adjacent side clamping assemblies for machining reference correction. The two positioning blocks 12 are fixed to the top surface of the positioning moving stage 1 by shims. Both positioning blocks 12 are long rectangular blocks, and the long sides of the two positioning blocks 12 are arranged perpendicularly to each other. The two positioning blocks 12 are used for machining reference positioning in the X-axis and Y-axis directions, respectively. After the four side clamping assemblies clamp the battery box die-casting 6, the positioning moving stage 1 moves laterally and longitudinally, so that the two side clamping assemblies are in rigid contact with the corresponding positioning blocks 12 for reference correction positioning.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the side clamp assembly includes an execution component 2 and a side clamping component 3. The execution component 2 includes an execution cylinder 21 that is horizontally fixed to the top surface of the positioning moving stage 1 by a fixing bracket. The execution cylinder 21 is an existing electric cylinder. A force sensor 22 is fixed to the output end of the execution cylinder 21. The other force-bearing end of the force sensor 22 is fixed to a stroke plate 23 by bolts. The force sensor 22 is an existing pressure sensor. In this embodiment, the force sensor 22 is only used to detect and visually feedback the clamping force value of the side clamp assembly on the outer side of the battery box die-cast part 6. A sliding base 24 is fixed to the bottom end of the stroke plate 23 by bolts. The sliding base 24 is slidably mounted on the top surface of the positioning moving stage 1 along the output direction of the execution cylinder 21.

[0032] like Figure 2 , Figure 3 and Figure 4As shown, the side clamping component 3 includes a guide plate 31, a preload spring 33, and a matrix clamping plate 4. Four guide posts 32, evenly distributed along a horizontal straight line, are fixed to the guide plate 31 by screws. The four guide posts 32 are horizontally slidably mounted on the stroke plate 23. Each of the four guide posts 32 is fitted with a preload spring 33, and both ends of the preload spring 33 are welded to the stroke plate 23 and the guide plate 31, respectively. Two vertical sliding grooves are fixed to the surface of the guide plate 31 facing away from the guide posts 32 by screws. The matrix clamping plate 4 includes a back plate 41 and a pin seat 42. The back plate 41 is slidably mounted in the two vertical sliding grooves of the guide plate 31. In this embodiment, an electric cylinder is vertically fixed to the guide plate 31 via a cylinder seat. The output end of the electric cylinder is fixed to the back plate 41, and the electric cylinder can drive a torque... The clamping plate 4 moves vertically. It should be noted that the electric cylinder is not shown in the attached drawing. To ensure the movement accuracy, the electric cylinder can be a high-precision electric cylinder that is matched with a servo motor and a ball screw 433. The ejector pin seat 42 has a rectangular insert groove. The back plate 41 is embedded in the insert groove of the ejector pin seat 42 and fixed by screws. A 2mm gap is reserved between the insert end face of the back plate 41 and the inner end face of the insert groove. The ejector pin seat 42 has a plurality of ejector pin holes 421 arranged in a rectangular array. The ejector pin holes 421 are cylindrical stepped holes and are horizontally connected to the insert groove. An ejector pin 43 can be detachably installed in each ejector pin hole 421. The ejector pins 43 arranged in an array are used to clamp and contact the same outer side of the battery box die casting 6.

[0033] It should be noted that, Figure 3 The battery box die casting 6 shown is a simplified schematic diagram and does not represent a specific structure. In order to enhance the overall strength of the battery box die casting 6, the battery box die casting 6 is usually provided with reinforcing structures such as reinforcing ribs. The side wall of the battery box die casting 6 is usually provided with a window structure for electrical installation. When the corresponding side of the battery box die casting 6 is clamped by the matrix clamping plate 4, the ejector pin 43 located in the window area and adjacent to the reinforcing rib can be detached to avoid interference with the clamping and movement adjustment of the ejector pin 43. The matrix clamping plate 4 is preferentially adapted to clamping the battery box die casting 6 with flat sides.

[0034] Since the battery box die-casting 6 is a thin-walled part, and the thickness of the battery box die-casting 6 may vary depending on the vehicle model, to avoid insufficient clamping force affecting processing stability or excessive clamping force causing deformation of the die-casting, those skilled in the art can perform clamping force tests on specific battery box die-casting 6 to determine the appropriate clamping force; such as Figure 2 and Figure 3As shown, in this invention, the side clamp assembly also includes a limiting component 5, which is used to limit the clamping force of the side clamp assembly on the battery box die-casting 6, so as to ensure that the clamping force is consistent with the tested clamping force or within the allowable positive and negative value range of the corresponding clamping force.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 As shown, the limiting component 5 includes an insert block 51, a stop seat 53, and a top contact block 54; a vertical sliding groove is welded on the guide plate 31, and the insert block 51 slides in the vertical sliding groove. A roller 52 protruding from the lower end face is horizontally mounted on the insert block 51; the stop seat 53 is horizontally slidably mounted on the sliding base 24. Specifically, the stop seat 53 slides on the sliding base 24 along the moving direction of the stroke plate 23. An extension hole can be opened on the stop seat 53, and a bolt is passed through the extension hole for clamping and locking; the stop seat 53 has an insertion hole 531 for the lower end of the insert block 51 to be inserted. The top contact block 54 is fixed to the top surface of the positioning moving table 1 by screws. The top contact block 54 and the roller 52 are arranged opposite to each other in the moving direction of the stroke plate 23. The stop seat 53 has a notch at the insertion hole 531 to avoid the top contact block 54. The top contact block 54 has an inclined surface and a horizontal end face. The horizontal end face is located at the top of the top contact block 54 and is flush with the upper end face of the stop seat 53.

[0036] In this invention, clamping force is generated by the compression of the pre-tension spring 33, and the mechanical properties of the pre-tension spring 33 determine that the magnitude of the clamping force is directly proportional to the compression distance. When the side clamping assembly clamps the side of the battery box die-casting 6, the stroke plate 23 and the sliding base 24 move synchronously under the drive of the actuator cylinder 21. The side clamping component 3 clamps and contacts the outer side of the battery box die-casting 6 through multiple ejector pins 43, so that the four pre-tension springs 33 are synchronously passively compressed and jointly provide clamping force. The force sensor 22 displays the change of clamping force in real time. At the same time, the insertion block 51 rolls and contacts the upper end face of the stop seat 53 through the roller 52. When the roller 52 moves to the insertion hole 531, the insertion block 51 automatically inserts under the action of gravity. The guide plate 31 automatically locks itself through the insertion of the insert block 51 and the stop seat 53, while the preload spring 33 remains under compression. After processing, the output end of the actuator cylinder 21 retracts, and the side clamping component 3, the insert block 51, and the stop seat 53 move synchronously to reset along with the stroke plate 23 and the sliding base 24. The roller 52 moves upward along the inclined surface of the top contact block 54 to the horizontal end face. During the actual movement, when the roller 52 approaches the horizontal end face, the insert block 51 has completely moved out of the insertion hole 531, the position lock of the guide plate 31 is released, the preload spring 33 is released, the side clamping component 3 resets relative to the stroke plate 23, and the roller 52 rolls into contact with the upper end face of the stop seat 53 again. In summary, when the battery box die-casting part 6 is clamped by the side clamping assembly, the clamping force will automatically lock at the position defined by the limiting component 5 and can be automatically unlocked during the reset process.

[0037] Before processing the die-cast battery box 6, the limiting component 5 can be adjusted. By moving and adjusting the position of the stop 53 on the sliding base 24, the clamping force detected by the force sensor 22 in the locked state is consistent with the clamping force determined by the test. It should be added that, in order to avoid the actuator cylinder 21 remaining in the starting state after the limit lock is engaged, causing clamping over-clamping, an existing through-beam photoelectric switch can be installed between the insert block 51 and the stop 53. Specifically, the transmitting end of the through-beam photoelectric switch can be fixed on the side end face of the insert block 51, while the receiving end is fixed on the stop 53. The through-beam photoelectric switch is electrically connected to the actuator cylinder 21 through an intermediate relay. When the insert block 51 is just inserted into the socket 531, the transmitting end and the receiving end are just aligned, the intermediate relay is disconnected, and the actuator cylinder 21 stops working, avoiding clamping over-clamping. When the limit lock is released, the intermediate relay is engaged, and the actuator cylinder 21 can start and control normally.

[0038] like Figure 3 , Figure 4 and Figure 5As shown, the ejector pin component 43 includes an ejector pin sleeve 431, an ejector pin 432 sliding in the ejector pin sleeve 431, and a compression spring 434 sleeved on the ejector pin 432. The ejector pin 432 has a stepped ring, and the compression spring 434 is embedded in the ejector pin hole 421. The ejector pin sleeve 431 is threadedly installed in the ejector pin hole 421. The ejector pin sleeve 431 is provided with a limit ring. When the ejector pin sleeve 431 is fully screwed into the ejector pin hole 421 and the limit ring is pressed against the end face of the ejector pin seat 42, the compression spring 434 is just clamped between the stepped surface inside the ejector pin hole 421 and the stepped ring of the ejector pin 432. One end of the ejector pin 432 passes through the ejector pin hole 421 and extends into the mounting groove of the ejector pin seat 42. The other end of 32 is movably embedded with a ball 433 that rolls in contact with the outer wall of the battery box die-casting 6. The ejector pin 43 contacts the battery box die-casting 6 through the ball 433, which reduces resistance during movement and adjustment. On the other hand, the ball 433 can better contact the small curved area on the outer surface of the battery box die-casting 6. When the compression spring 434 is not actively compressed, all the ejector pins 432 extend into the recessed groove with the same length, which is 2mm. A distributed pressure sensor for detecting the contact force threshold of the ejector pin 43 is fixed on the embedded end face of the back plate 41. One end of the ejector pin 432 extending into the recessed groove contacts the distributed pressure sensor.

[0039] It should be noted that in this embodiment, the stiffness of the compression spring 434 is actually much greater than that of the preload spring 33. When the outer side of the battery box die-cast part 6 is clamped by the side clamp assembly, the preload spring 33 will be compressed first to generate a preload clamping force, while the compression spring 434, with its greater stiffness, mainly plays the role of transmitting force. Through the design and selection of the material stiffness of the preload spring 33 and the compression spring 434 by those skilled in the art, as well as through actual use testing, the appropriate preload spring 33 and compression spring 434 can be determined.

[0040] In addition, in this embodiment, the distributed pressure sensor is an existing pressure sensor with continuous detection points, which can be used to detect the contact force exerted by each ejector pin 43 on the distributed pressure sensor through one end of the ejector pin 432. The distributed pressure sensor is used in conjunction with the electric cylinder to achieve closed-loop pressure control. Specifically, the corresponding control system also includes a central control unit and a signal receiving module. The central control unit is equipped with a contact force threshold for comparison. The distributed pressure sensor is used to detect the contact force exerted by each ejector pin 43 on its surface in real time and accurately. The signal receiving module forms a signal path between the distributed pressure sensor and the central control unit for real-time transmission of pressure detection data. The central control unit compares the received pressure detection signal with the threshold in real time. When the contact force of any ejector pin 43 exceeds the set contact force threshold, the central control unit immediately inputs a start command signal to the electric cylinder drive module. The electric cylinder then starts, driving the matrix clamp 4 to slide vertically along the guide plate 31. This is used to actively adjust the contact position of the balls 433 of all ejector pins 43 with the outer side of the battery box die-casting part 6. When the central control unit detects that the contact force of all ejector pins 43 has fallen back to the set threshold range through real-time threshold comparison, it immediately issues a stop command signal. The electric cylinder drive module stops after receiving the stop command.

[0041] In actual operation, the matrix clamping plate 4 clamps the battery box die-casting part 6 through the array of distributed ejector pins 43. When the flatness of the clamping contact area of ​​the battery box die-casting part 6 is high, the compression springs 434 mainly transmit force, and each compression spring 434 generates only a very small amount of compression. The contact force of each ejector pin 43 is within the set threshold range. The matrix clamping plate 4 can maintain the original clamping area. When the limit is locked, if it is detected that the contact force in the original clamping area of ​​the matrix clamping plate 4 exceeds the set threshold, it means that at least one ball 433 of the ejector pin 43 is in contact with the protrusion on the outer side of the battery box die-casting part 6, so that the compression spring 434 of the ejector pin 43 at that point is significantly compressed and the contact force exceeds the threshold. At this time, the matrix clamping plate 4 actively moves to adjust the clamping contact position, thereby ensuring that the ball 433 of each ejector pin 43 maintains effective clamping contact with the outer side of the battery box die-casting part 6, avoiding local concentration of clamping stress and improving the uniformity of clamping force distribution.

[0042] like Figure 1 , Figure 2 and Figure 3As shown, each of the two side clamping assemblies that cooperate with the positioning block 12 has a retaining plate 13 fixed on its side wall of the ejector pin seat 42. The retaining plate 13 is used to rigidly position and contact the corresponding positioning block 12. After the outer side of the battery box die-casting part 6 is clamped, the position of the ejector pin seat 42 and the outer side of the battery box die-casting part 6 is clear. The retaining plate 13 is positioned in cooperation with the positioning block 12 with the ejector pin seat 42 as an indirect reference. It should be emphasized here that the compression amount of the compression spring 434 is extremely small, and its influence on the distance between the ejector pin seat 42 and the outer side wall of the battery box die-casting part 6 is negligible.

[0043] After the battery box die-cast part 6 to be processed is placed on the workpiece table 11, since the four side clamping assemblies are all clamped and contacted by the ball bearings 433, the four side clamping assemblies can be started synchronously, so that the four matrix clamping plates 4 are clamped on the four outer side walls of the battery box die-cast part 6 by the ejector pins 43. During the clamping process, each side clamping assembly completes automatic limit locking through the limiting component 5 to ensure that the clamping force is at an appropriate level, and actively adjusts the clamping contact position according to the flatness of the outer side to ensure the uniformity of the clamping force distribution.

[0044] After the battery box die-casting part 6 is clamped on all four sides, the positioning moving stage 1 moves laterally and longitudinally, so that the two abutment plates 13 are rigidly attached to the two positioning blocks 12, achieving machining datum correction and positioning. This ensures that each battery box die-casting part 6 is machined under the same positioning datum.

[0045] This invention provides a machining limiting clamping structure for a die-cast battery box 6 for new energy vehicles. Through the cooperation of four side clamping assemblies, the die-cast battery box 6 can be clamped from four sides. The side clamping assemblies ensure the appropriate clamping force for the specific structure of the die-cast battery box 6 by adjusting the clamping force limit and automatically locking the limit during clamping. This avoids insufficient clamping force affecting machining stability, while also preventing excessive clamping force from deforming the die-cast part and affecting machining accuracy. The side clamping assemblies actively adjust the clamping contact surface to avoid localized clamping stress concentration. Insufficient clamping force ensures uniformity of clamping force distribution. Furthermore, based on four-sided clamping, active movement achieves rigid positioning with the machining positioning datum. This invention solves the problems of uncertain and inconsistent clamping force, deviation in positioning accuracy, and coupling interference between clamping and positioning in existing fixtures that use synchronous positioning during clamping by decoupling the clamping action and the datum positioning action. This improves the stability and positioning accuracy of clamping the battery box die casting 6, thereby improving the machining quality of the battery box die casting 6.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a manner common to the art; any possible variations and modifications made by those skilled in the art without departing from the technical solution of the present invention, or equivalent embodiments with equivalent changes, do not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A new energy automobile battery box die casting machining limiting and clamping structure, characterized in that, The utility model relates to a battery box die casting positioning and clamping device, including: Positioning mobile platform for placing battery box die casting and capable of moving in horizontal transverse and horizontal longitudinal directions; And four side clamping assemblies, each fixed on the positioning mobile platform and used for clamping on four outer sides of the battery box die casting correspondingly; the side clamping assembly includes an execution assembly and a side clamping component; The execution assembly includes a sliding base horizontally slidingly installed on the positioning mobile platform and a stroke plate fixed on the top end of the sliding base; the side clamping component includes a guide base plate slidingly installed on the stroke plate along the sliding direction of the sliding base, and a matrix clamping plate vertically driven and slidingly installed on the guide base plate; an elastic member for clamping by elastic pre-tightening force is connected between the guide base plate and the stroke plate; A plurality of top pin members arranged in a rectangular matrix are arranged on the matrix clamping plate, and a distributed pressure sensor in contact with all the top pin members is arranged; all the top pin members are used for clamping and contacting the battery box die casting together; the distributed pressure sensor is used for detecting the top touch force of the top pin member, and the matrix clamping plate is adapted to slide according to the top touch force feedback to adjust the clamping and contacting position; A limiting assembly for limiting the elastic pre-tightening force is assembled between the matrix clamping plate and the sliding base; two positioning blocks for machining reference correction corresponding to two adjacent side clamping assemblies are arranged on the positioning mobile platform; when the four side clamping assemblies complete clamping on the battery box die casting, the positioning mobile platform is moved in the transverse and longitudinal directions, so that the two side clamping assemblies are in rigid contact with the corresponding positioning blocks for reference correction positioning.

2. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 1, characterized in that: The matrix clamping plate includes a back plate vertically slidingly installed on the guide base plate and a top pin seat fixed on the back plate; the top pin member is detachably installed on the top pin seat; the distributed pressure sensor is fixed on the back plate and is used for top touch force threshold detection of the top pin member; the top pin member horizontally penetrates the top pin seat and one end is in contact with the distributed pressure sensor; when the distributed pressure sensor detects that the top touch force of any top pin member exceeds the threshold, the back plate stops sliding when the top touch force of any top pin member is within the threshold.

3. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 1, characterized in that: The limiting assembly includes an insertion block and a stop seat; the insertion block is vertically slidingly installed on the guide base plate; the stop seat is horizontally slidingly and adjustably installed on the sliding base; the stop seat is provided with an insertion hole for inserting the lower end of the insertion block.

4. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 2, characterized in that: A plurality of top pin holes arranged in a rectangular matrix are arranged on the top pin seat; the top pin member includes a top pin sleeve, a top pin sliding in the top pin sleeve and a compression spring sleeved on the top pin; the top pin penetrates the top pin seat and one end is in contact with the distributed pressure sensor, the top pin sleeve is screwedly and fittingly installed in the top pin hole, and the compression spring is limitingly installed in the top pin hole by the top pin.

5. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 3, characterized in that: A roller exposed from the lower end surface is horizontally rotationally installed on the insertion block; the limiting assembly further includes a top touch block fixed on the positioning mobile platform; when the sliding base is reset, the roller is in rolling contact with the top touch block, and the top touch block moves the insertion block out of the insertion hole through the top touch roller.

6. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 4, characterized in that: The execution assembly further includes an execution cylinder horizontally fixed on the positioning mobile platform, and a force sensor is fixed between the output end of the execution cylinder and the stroke plate; a plurality of guide columns horizontally slidingly installed on the stroke plate are fixed on the guide base plate; the elastic member is a pre-tightening spring, and a plurality of pre-tightening springs are fixed between the stroke plate and the guide base plate.

7. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 6, characterized in that: The stiffness of the compression spring is greater than the stiffness of the pre-tightening spring.

8. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 2, characterized in that: The top pin seat side wall of the two side clamping assemblies matched with the positioning blocks is fixed with an abutting plate for rigid positioning contact with the corresponding positioning block.

9. The processing and clamping structure of the die casting of the battery box of the new energy vehicle according to claim 4, characterized in that: The top pin has a ball at one end, which is in rolling contact with the outer side wall of the die casting of the battery box.

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