Punch forming die structure and forming method for automobile threaded plate

Abstract

The invention relates to the technical field of automobile part machining, in particular to an automobile threaded plate punch forming die structure which comprises an upper die, a lower die, an in-die tapping machine and a plurality of deviation rectifying mechanisms, the in-die tapping machine is fixed to the top of the lower die, and a screw tap of the in-die tapping machine is located below a plate conveying path; the multiple deviation rectifying mechanisms are fixed to the top of the lower die, symmetrically distributed on the front side and the rear side of the in-die tapping machine and arranged in a matrix mode along the left side and the right side of a plate conveying path. By arranging the deviation rectifying mechanism, the posture of the plate in the tapping station is automatically adjusted, it is ensured that the plate can be accurately positioned, and therefore the machining precision and product consistency of the threaded plate are effectively improved. And meanwhile, the risks of screw tap abrasion and breakage are reduced, the maintenance frequency of equipment is reduced, and continuous operation of production and process stability are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, and in particular to a stamping die structure and forming method for automotive threaded plates. Background Technology

[0002] Threaded plates, as indispensable components in automobile manufacturing, are widely used in the assembly of body structures, chassis systems, and various accessories. They are typically produced using a continuous stamping process, with multi-station stamping production lines completing processes such as blanking, forming, punching, flanging, and tapping. Among these, tapping, as a crucial process for forming internal threads, directly impacts the reliability of subsequent assembly. To improve production efficiency, most stamping dies now employ in-die tapping technology, integrating the in-die tapping machine inside the stamping die to achieve simultaneous stamping and tapping.

[0003] In practical applications, the sheet metal may shift or tilt when it is conveyed to the tapping station, resulting in inaccurate sheet metal positioning. When the sheet metal is not perfectly aligned, the tap of the in-die tapping machine cannot accurately align with the preset tapping hole position, causing misalignment between the tap and the hole. This not only affects the quality of thread forming but also accelerates tap wear, and in severe cases, may even lead to tap breakage, increasing equipment maintenance frequency and reducing production efficiency. Furthermore, during the stamping process, when the upper die presses down on the sheet metal, the sheet metal may experience slight displacement due to uneven force, further exacerbating the deviation between the tap and the hole position.

[0004] In traditional automotive threaded sheet stamping dies, the tapping station lacks an effective correction mechanism, making it impossible to correct the sheet metal's posture before tapping. This results in unstable processing quality, affecting product consistency and yield. Furthermore, it increases the frequency of die maintenance, negatively impacting continuous production. Summary of the Invention

[0005] In view of this, the present invention proposes a die structure and forming method for stamping automotive threaded plates. By setting up a correction mechanism, it automatically adjusts the posture of the sheet metal in the tapping station, ensuring precise positioning of the sheet metal and effectively improving the processing accuracy and product consistency of the threaded plate. Simultaneously, it reduces the risk of tap wear and breakage, decreases equipment maintenance frequency, ensures continuous production and process stability, and solves the problems of inaccurate positioning, processing quality fluctuations, and high equipment wear caused by sheet metal misalignment during the tapping process in existing dies.

[0006] The technical solution of this invention is implemented as follows: On one hand, the present invention provides a stamping die structure for automotive threaded plates, including an upper die, a lower die, an in-die tapping machine, and multiple correction mechanisms, wherein, The in-mold tapping machine is fixed to the top of the lower mold, and its tap is located below the plate conveying path; Multiple correction mechanisms are fixed to the top of the lower die and symmetrically distributed on the front and rear sides of the in-die tapping machine, and arranged in a matrix along the left and right sides of the sheet metal conveying path. The top of the correction mechanism is provided with an elastic telescopic end and a horizontal rotating end along the vertical direction; In the conveying state, the top of the elastic telescopic end slides back and forth with the bottom of the plate, and the side of the horizontal rotating end rolls with the side of the plate. In the closed state, the upper mold moves downward, cooperates with the elastic telescopic end to elastically clamp the plate, and causes the side of the plate to slide downward along the side of the horizontal rotating end.

[0007] Based on the above technical solutions, preferably, both the elastic telescopic end and the horizontal rotating end are columnar structures, wherein... The horizontal rotating end extends vertically through the elastic telescopic end, and the two can rotate relative to each other in the circumferential direction and slide relative to each other in the axial direction.

[0008] Based on the above technical solutions, preferably, the bottom of the upper mold is fixed with a push rod and a limiting plate, wherein, The bottom end of the ejector pin is used to abut against the top surface of the plate when the mold is closed. The bottom end of the top rod is provided with a first clearance hole for the upper end of the horizontal rotating end to enter; The bottom end of the limiting plate is horizontally aligned with the bottom end of the ejector pin, and is used to abut against the top surface of the plate during mold closing; The bottom end of the limiting plate is provided with a second clearance hole for the tap to enter.

[0009] Based on the above technical solutions, preferably, the bottom of the elastic telescopic end is provided with a wedge-shaped block, the side of the horizontal rotating end is provided with a first flange, and the upper side of the horizontal rotating end is provided with a first positioning area and a second positioning area from top to bottom, wherein... The top of the first flange is provided with a wedge-shaped tooth groove along the circumferential direction; In the conveying state, the first positioning area abuts against the side of the plate, the second positioning area is located inside the elastic telescopic end, and the wedge block is located above the first flange; In the mold-closed state, the elastic telescopic end moves downward, causing the second positioning area to move out of its interior and the side of the plate to abut against the second positioning area. At the same time, the wedge block engages with one of the wedge tooth grooves to drive the horizontal rotating end to deflect in place.

[0010] Based on the above technical solutions, preferably, the wedge block is made of elastic rubber.

[0011] Based on the above technical solutions, preferably, the second positioning area is a cylindrical structure, which is rotatably fitted onto the horizontal rotating end, wherein... The outer diameter of the cylindrical structure is equal to the outer diameter of the first positioning area. In the conveying state, the top end of the elastic telescopic end is higher than the top end of the cylindrical structure; The vertical height of the cylindrical structure is greater than the vertical thickness of the plate.

[0012] Based on the above technical solutions, preferably, the side of the horizontal rotating end is provided with an annular groove, wherein... The cylindrical structure is rotatably disposed in the annular sink via bearings.

[0013] Based on the above technical solutions, preferably, the correction mechanism includes a base and a compression spring, wherein, The base is fixed to the top of the lower mold and has a receiving cavity inside it. The compression spring is located inside the receiving cavity. The lower end of the elastic telescopic end slides into the receiving cavity and abuts against the top of the compression spring, while the upper end extends upward through the top of the base. The lower end of the horizontal rotating end is rotatably positioned at the bottom of the receiving cavity, and the upper end passes upward through the compression spring and then through the top of the elastic telescopic end.

[0014] Based on the above technical solutions, preferably, the top of the horizontal rotating end is provided with a second flange, wherein... The second flange has an air cavity inside, and the bottom of the air cavity has an air blowing hole; An air passage is provided on the inner side of the horizontal rotating end; The upper end of the airway is connected to the air chamber, and the lower end is connected to the receiving cavity; The lower side of the elastic telescopic end slides and is sealed to the side wall of the receiving cavity; When the elastic telescopic end descends, it blows the gas in the accommodating cavity from the air blowing hole to the outer side of the horizontal rotating end.

[0015] On the other hand, the present invention also provides a method for forming automotive threaded plates, which utilizes the above-mentioned automotive threaded plate stamping die structure and includes the following steps: S1. Install a pair of the correction mechanisms on the top of the lower die and in the area on both sides of the inside tapping machine; S2. Fix the upper die to the output end of the servo press and fix the lower die to the worktable of the servo press. S3. During the conveying of the sheet metal, the alignment mechanism performs the first posture correction on the sheet metal to be tapped. The sheet material is slidably conveyed at the top of the elastic telescopic end, with its two sides abutting and rolling against the sides of the horizontal rotating end to guide the central axis of the sheet material to coincide with the central axis of the conveying path. S4. When the tapping hole of the plate reaches above the tap of the in-mold tapping machine, the feeding is paused; S5. The tap is rotated by an in-mold tapping machine, and then the upper and lower dies are closed by a servo press. During this process, the sheet metal is corrected a second time by the correction mechanism, and then the tap is used for tapping. When the upper mold moves down, it cooperates with the elastic telescopic end to elastically clamp the plate, and causes the side of the plate to slide down along the side of the horizontal rotating end to a new positioning point. During the process, the plate continues to move down, and the tap extends into the tapping hole and rotates to tap. S6. After tapping, the tap reverses direction, and simultaneously, the upper die moves upward, the elastic telescopic end springs back to its original position, driving the plate material to move upward, separating the plate material from the tap, thus completing the thread forming operation of the tapped hole in the plate material. The upper mold moves upward and downward at the same speed.

[0016] The automotive threaded plate stamping die structure and forming method of the present invention have the following advantages over the prior art: (1) By setting up multiple matrix-distributed correction mechanisms, the plate posture can be supported and dynamically corrected at multiple points during plate conveying and mold closing, ensuring that the plate is positioned with high precision before tapping, effectively preventing tap misalignment, wear or breakage caused by plate offset or tilt, improving processing consistency and mold service life, and enhancing the stability and production efficiency of stamping.

[0017] (2) By setting the top of the elastic telescopic end to slide back and forth with the bottom of the plate during the conveying state, and the side of the horizontal rotating end to roll with the side of the plate, the initial positioning of the plate is achieved. During the mold closing state, the elastic telescopic end moves down, causing the second positioning area to move out from its interior and abut against the side of the plate, thus completing the secondary precise positioning of the plate's posture. This structure realizes two correction actions for the plate during the conveying stage and the mold closing stage, which are used for initial positioning and precise correction, respectively, improving positioning accuracy and stability.

[0018] (3) The meshing of the wedge block and the toothed groove not only enables automatic deflection of the horizontal rotating end, but also provides an unlocking function in case the horizontal rotating end accidentally jams, preventing damage to the first positioning area due to continuous friction, extending the service life of the component and ensuring a good positioning and correction effect. In addition, the design of the wedge block and wedge groove allows the horizontal rotating end to adjust its angle when necessary, increasing the randomness of the contact surface and avoiding excessive local wear. Combined with the phased correction strategy of the first and second positioning areas, it not only further extends the service life of the horizontal rotating end, but also ensures its long-term stable correction effect.

[0019] (4) By setting the wedges to be made of elastic material, the system's reliability and durability are further enhanced, preventing one of the wedges from impacting and being damaged when it engages.

[0020] By setting the second positioning area as a cylindrical structure, it can participate stably in the correction process for a long time, avoiding positioning failure due to wear. In addition, the outer diameter of the second positioning area is the same as that of the first positioning area, ensuring that the plate is subjected to uniform force and consistent positioning during the correction process at different stages, thus improving processing consistency.

[0021] (5) The automatic air blowing cleaning function is realized through the air chamber and air channel structure, which can effectively remove dust and debris from the surface of the plate and the correction structure, avoid the influence of foreign objects on the correction accuracy, improve the cleanliness and stability of the mold operation, and extend the service life of key components. At the same time, the structure can also provide air cooling for the elastic telescopic end and the horizontal rotating end by drawing in outside air, which helps to reduce the working temperature and further improve the service life of the components. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a stamping die structure for automotive threaded plates according to the present invention. Figure 2 This is a side view of a stamping die structure for automotive threaded plates according to the present invention; Figure 3 for Figure 2 Sectional view along axis AA; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 for Figure 4A three-dimensional view of the affected area; Figure 6 A partial 3D view of the correction mechanism; Figure 7 This is a partial 3D view of the horizontally rotated end; In the diagram: 1. Upper mold; 2. Lower mold; 3. In-mold tapping machine; 4. Correction mechanism; 11. Ejector rod; 12. Limiting plate; 31. Tap; 41. Elastic telescopic end; 42. Horizontal rotating end; 43. Base; 44. Compression spring; 111. First clearance hole; 121. Second clearance hole; 411. Wedge block; 421. First flange; 422. First positioning area; 423. Second positioning area; 424. Annular groove; 425. Second flange; 426. Air passage; 431. Receiving cavity; 4211. Wedge tooth groove; 4251. Air chamber; 4252. Air blowing hole. Detailed Implementation

[0024] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] like Figure 1-7 As shown, the present invention provides a stamping die structure for automotive threaded plates, including an upper die 1, a lower die 2, an in-die tapping machine 3, and multiple correction mechanisms 4. The in-die tapping machine 3 is fixed to the top of the lower die 2, and its tap 31 is located below the plate conveying path for tapping the plate. The multiple correction mechanisms 4 are fixed to the top of the lower die 2, and are symmetrically distributed on the front and rear sides of the in-die tapping machine 3, and arranged in a matrix along the left and right sides of the plate conveying path to achieve multi-point support and dynamic correction of the plate, ensuring high-precision positioning of the plate before tapping.

[0026] Each correction mechanism 4 has an elastic telescopic end 41 and a horizontal rotating end 42 at its top, which are used for sliding engagement with the bottom of the sheet metal and rolling engagement with the sides of the sheet metal, respectively. In the conveying state, the sheet metal slides along the top of the elastic telescopic end 41, and its two sides roll into contact with the sides of the horizontal rotating end 42 to guide the central axis of the sheet metal to coincide with the central axis of the conveying path, achieving initial positioning. In the mold closing state, the upper mold 1 moves down and engages with the elastic telescopic end 41 to elastically clamp the sheet metal, while the sides of the sheet metal slide downwards along the sides of the horizontal rotating end 42, achieving further adjustment of the sheet metal's posture and ensuring that the tapping hole position is aligned with the tap 31, thereby improving processing consistency and mold life.

[0027] In this invention, both the elastic telescopic end 41 and the horizontal rotating end 42 are columnar structures. The horizontal rotating end 42 vertically penetrates the elastic telescopic end 41, forming a connection structure that allows relative rotation and sliding. This design allows the horizontal rotating end 42 to rotate with the movement of the side of the sheet during sheet material conveying, reducing frictional resistance and improving correction accuracy and durability. Simultaneously, during mold closing, as the elastic telescopic end 41 moves downward along the axial direction, the portion of the horizontal rotating end 42 originally located inside the elastic telescopic end 41 is exposed and contacts the sheet material, thereby achieving secondary positioning of the side of the sheet material.

[0028] In this invention, the bottom of the upper mold 1 is fixed with a push rod 11 and a limiting plate 12. The bottom end of the push rod 11 has a first clearance hole 111 to accommodate the upper end of the horizontally rotating end 42, preventing motion interference during mold closing. The bottom end of the push rod 11 abuts against the top surface of the sheet metal in the mold-closed state, achieving the function of pressing the sheet metal. The bottom end of the limiting plate 12 is horizontally aligned with the bottom end of the push rod 11, also abutting against the top surface of the sheet metal during mold closing to prevent sheet metal displacement. The bottom of the limiting plate 12 has a second clearance hole 121 for the tap 31 to enter, ensuring that the tap 31 does not collide with the limiting plate 12 during tapping, thus ensuring the smooth progress of the tapping action.

[0029] In this invention, the bottom of the elastic telescopic end 41 is provided with a wedge-shaped block 411, and the side of the horizontal rotating end 42 is provided with a first flange 421, the top of which is provided with a ring of wedge-shaped grooves 4211 along the circumference. The upper side of the horizontal rotating end 42 is provided with a first positioning area 422 and a second positioning area 423, which are used for preliminary positioning during the sheet material conveying stage and secondary positioning during the mold closing stage, respectively. In the conveying state, the first positioning area 422 abuts against the side of the sheet material, and the second positioning area 423 is located inside the elastic telescopic end 41. In the mold closing state, the elastic telescopic end 41 moves down, causing the second positioning area 423 to move out from inside the elastic telescopic end 41 and abut against the side of the sheet material. At the same time, the wedge-shaped block 411 engages with one of the wedge-shaped grooves 4211, driving the horizontal rotating end 42 to deflect in place, realizing fine adjustment of the sheet material posture, preventing local wear caused by long-term force on a certain position of the horizontal rotating end, thereby extending the service life and improving the correction effect.

[0030] Since the second positioning area 423 does not participate in contact during the lateral conveying of the sheet metal, it is not subject to the cutting effect caused by the lateral movement of the sheet metal. Compared with other areas of the horizontal rotating end 42, the surface quality of the second positioning area 423 is better maintained, and it is less prone to wear or scratches. This provides a higher precision positioning effect during the mold closing stage, further improving the positioning stability and service life of the correction mechanism 4.

[0031] In this structure, the wedge block 411 is made of elastic rubber material, giving it good elasticity and wear resistance. Therefore, it acts as a buffer during the meshing process between the wedge block 411 and the wedge tooth groove 4211, preventing damage from rigid collisions and ensuring the stability and reliability of the meshing. Simultaneously, this design enhances the adaptability of the correction mechanism 4 under complex working conditions and extends the service life of the components.

[0032] In this invention, the second positioning area 423 is a cylindrical structure that is rotatably fitted onto the horizontal rotating end 42. The outer diameter of this cylindrical structure is the same as the outer diameter of the first positioning area 422, and its hardness is greater than that of the sheet material. Its rotatability allows it to stably participate in the correction process for a long time, avoiding positioning failure due to wear.

[0033] In the conveying state, the top of the elastic telescopic end 41 is higher than the top of the cylindrical structure, ensuring that the plate only contacts the first positioning area 422, and that dust does not easily enter between the mating surface of the second positioning area 423 and the horizontal rotating end 42, thus ensuring good rotational fit.

[0034] During mold closing, the elastic telescopic end 41 moves downward, exposing the second positioning area 423 and bringing it into contact with the side of the sheet metal, thus achieving secondary correction of the sheet metal. The vertical height of the cylindrical structure is greater than the thickness of the sheet metal, ensuring that it maintains effective contact throughout the correction process and improving processing consistency.

[0035] Furthermore, an annular groove 424 is provided on the side of the horizontal rotating end 42, and the cylindrical structure is rotatably disposed in the annular groove 424 via bearings. This structure reduces the frictional resistance between the cylindrical structure and the horizontal rotating end 42, improving the sensitivity and response speed of the correction process. At the same time, this structure extends the service life of the second positioning area 423 and improves the overall stability and reliability of the mold operation.

[0036] In this invention, the correction mechanism 4 includes a base 43 and a compression spring 44. The base 43 is fixed to the top of the lower mold 2 and has a receiving cavity 431 inside, with the compression spring 44 located inside the receiving cavity 431. The lower end of the elastic telescopic end 41 is slidably fitted in the receiving cavity 431 and abuts against the top of the compression spring 44, while the upper end extends upward through the top of the base 43 to support the plate. The lower end of the horizontal rotating end 42 is rotatably disposed at the bottom of the receiving cavity 431, and the upper end extends upward through the compression spring 44 and then through the top of the elastic telescopic end 41.

[0037] In this structure, a compression spring 44 provides an elastic restoring force, enabling the elastic telescopic end 41 to automatically reset and clamp the sheet metal during mold closing, achieving flexible clamping and dynamic correction of the sheet metal and enhancing the mold's adaptability to sheet metal of different thicknesses. Simultaneously, after tapping, the elastic telescopic end 41 drives the sheet metal upwards, separating it from the tap 31. Since the sheet metal remains elastically clamped between the elastic telescopic end 41 and the ejector pin 11 during upward movement, and its top abuts against the limiting plate, its upward speed is the same as that of the upper mold 1, and both move upwards synchronously.

[0038] In practical applications, the number of correction mechanisms 4 is determined according to the weight of the board. That is, the greater the weight of the board, the more correction mechanisms 4 are set to provide sufficient elastic clamping force and elastic restoring force. The specific number is not limited in this embodiment.

[0039] In this invention, the top of the horizontal rotating end 42 is provided with a second flange 425, inside which is an air cavity 4251, and the bottom of the air cavity 4251 is provided with an air blowing hole 4252. An air passage 426 is provided on the inner side of the horizontal rotating end 42, with its upper end connected to the air cavity 4251 and its lower end connected to the receiving cavity 431. Specifically, the air passage 426 is located at the axial centerline of the horizontal rotating end 42 and has a hole-like structure. The upper end of this hole-like structure is connected to the air cavity 4251, and the lower end is closed. A radial opening is provided on the lower side of the hole, allowing the receiving cavity 431 to communicate with the air passage 426.

[0040] During the downward movement of the elastic telescopic end 41, the gas in the receiving cavity 431 is compressed and sequentially enters the air chamber 4251 through the air passage 426, and is finally ejected downward from the air blowing hole 4252, achieving automatic blowing and cleaning of the outer surface of the horizontal rotating end 42 and the top of the elastic telescopic end 41. Simultaneously, during the return upward movement of the elastic telescopic end 41, external air can be drawn into the receiving cavity 431 through the air blowing hole 4252, completing air circulation. This structure not only effectively removes dust and debris adhering to the surface of the correction structure, but also achieves air cooling of related components through airflow, thereby further extending the service life of the correction mechanism and improving the stability and cleanliness of mold operation.

[0041] The aforementioned automotive threaded plate stamping die structure is applied to an automotive threaded plate stamping production line. In application, the aforementioned automotive threaded plate stamping die structure is installed at the tapping hole position of the production line for thread tapping and forming. The specific steps include: S1. Install a pair of correction mechanisms 4 on the top of the lower die 2 and in the area on both sides of the inner tapping machine 3; S2. Fix the upper die 1 to the output end of the servo press and fix the lower die 2 to the worktable of the servo press. S3. When conveying the plate, the plate to be tapped is first corrected by the correction mechanism 4. The plate slides and is conveyed on the top of the elastic telescopic end 41. Its two sides abut and roll with the sides of the horizontal rotating end 42 to guide the central axis of the plate to coincide with the central axis of the conveying path. S4. When the tapping hole of the plate reaches above the tap 31 of the in-mold tapping machine 3, the feeding is paused; S5. The tap 31 is rotated by the in-mold tapping machine 3, and then the upper die 1 and lower die 2 are closed by the servo press. During the process, the plate is corrected for the second time by the correction mechanism 4, and then tapped by the tap 31. When the upper die 1 moves down, it cooperates with the elastic telescopic end 41 to elastically clamp the plate and make the side of the plate slide down along the side of the horizontal rotating end 42 to a new positioning point (second positioning area 423). During the process, the plate continues to move down, and the tap 31 extends into the tapping hole and rotates to tap. S6. After tapping, tap 31 reverses direction. At the same time, upper die 1 moves upward and elastic telescopic end 41 springs back to reset, driving the plate to move upward and separating the plate from tap 31, thus completing the thread forming operation of the tapping hole of the plate. The upward and downward movement speeds of upper die 1 are the same and are matched with the rotation speed of tap 31.

[0042] In this invention, the in-mold tapping machine 3 is fixed to the top of the lower die 2. It contains a servo motor, which is communicatively connected to the CNC control module of the servo press and drives the tap 31 to rotate only in its original position without axial feed. The tapping process is achieved by the downward movement of the sheet metal under the pressure of the upper die 1, bringing it into contact with the rotating tap 31 for relative feed, thus completing the thread machining. The speed control of the tap 31 falls within the scope of existing technology. For example, the utility model patent with authorization number CN215145398U discloses a tapping machine using a servo motor, which includes a servo motor, a planetary reducer working in conjunction with the servo motor, a tap mounting base, and a tap spindle. This structure enables precise control of the tap speed and is suitable for the synchronous control requirements of the sheet metal tapping process in this invention.

[0043] To ensure thread forming quality, the descent speed of the sheet metal must be synchronized with the rotation speed of the tap 31. This synchronization is determined by the pitch (P) of the thread being machined. Specifically, for every pitch distance the sheet metal descends, the tap 31 should rotate exactly one revolution to ensure continuous and complete thread profile. The specific feed calculations for tapping are known from existing technologies.

[0044] To achieve the aforementioned speed matching, this invention employs a servo press to drive the upper die 1 to rise and fall. For example, a servo motor-controlled FPCB press disclosed in Utility Model No. CN202921705U, or a servo stamping mechanism for sheet metal stamping disclosed in Utility Model No. CN220593350U. The servo press can precisely control the die's moving speed and stroke height; its control method and principle belong to existing technology and can be directly applied to the technical solution of this invention.

[0045] In practical applications, the descent speed of the sheet metal should be matched and set according to the tap's rotational speed and the pitch of the thread being machined. Specific parameters can be adjusted according to actual product requirements, such as thread specifications, material properties, and processing efficiency. This embodiment does not limit the specific feed parameters and tap parameters; relevant parameters can be flexibly set according to process requirements to achieve a stable thread forming effect.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stamping die structure for automotive threaded plates, characterized in that: It includes an upper die (1), a lower die (2), an in-die tapping machine (3), and multiple correction mechanisms (4), among which, The in-mold tapping machine (3) is fixed to the top of the lower mold (2), and its tap (31) is located below the plate conveying path; Multiple correction mechanisms (4) are fixed to the top of the lower die (2) and symmetrically distributed on the front and rear sides of the in-die tapping machine (3), and arranged in a matrix along the left and right sides of the plate conveying path; The top of the correction mechanism (4) is provided with an elastic telescopic end (41) and a horizontal rotating end (42) along the vertical direction. In the conveying state, the top of the elastic telescopic end (41) slides back and forth with the bottom of the plate, and the side of the horizontal rotating end (42) rolls with the side of the plate; In the closed state, the upper mold (1) moves down and cooperates with the elastic telescopic end (41) to elastically clamp the plate, and the side of the plate slides down along the side of the horizontal rotating end (42).

2. The automotive threaded plate stamping die structure as described in claim 1, characterized in that: Both the elastic telescopic end (41) and the horizontal rotating end (42) are columnar structures, wherein, The horizontal rotating end (42) extends vertically through the elastic telescopic end (41), and the two can rotate relative to each other in the circumferential direction and slide relative to each other in the axial direction.

3. The automotive threaded plate stamping die structure as described in claim 1, characterized in that: The bottom of the upper mold (1) is fixed with a push rod (11) and a limiting plate (12), wherein, The bottom end of the push rod (11) is used to abut against the top surface of the plate in the mold-closed state; The bottom end of the top rod (11) is provided with a first clearance hole (111) for the upper end of the horizontal rotating end (42) to enter. The bottom end of the limiting plate (12) is horizontally aligned with the bottom end of the push rod (11) for contacting and engaging with the top surface of the plate during mold closing. The bottom end of the limiting plate (12) is provided with a second clearance hole (121) for the tap (31) to enter.

4. The automotive threaded plate stamping die structure as described in claim 1, characterized in that: The bottom of the elastic telescopic end (41) is provided with a wedge-shaped block (411), the side of the horizontal rotating end (42) is provided with a first flange (421), and the upper side of the horizontal rotating end (42) is provided with a first positioning area (422) and a second positioning area (423) from top to bottom. The top of the first flange (421) is provided with a wedge-shaped toothed groove (4211) along the circumferential direction. In the conveying state, the first positioning area (422) abuts against the side of the plate, the second positioning area (423) is located inside the elastic telescopic end (41), and the wedge block (411) is located above the first flange (421). In the mold-closed state, the elastic telescopic end (41) moves down, causing the second positioning area (423) to move out from its interior, and causing the side of the plate to abut against the second positioning area (423), while the wedge block (411) engages with one of the wedge tooth grooves (4211) to drive the horizontal rotating end (42) to deflect in place.

5. The automotive threaded plate stamping die structure as described in claim 4, characterized in that: The wedge block (411) is made of elastic rubber.

6. The automotive threaded plate stamping die structure as described in claim 4, characterized in that: The second positioning area (423) is a cylindrical structure, which is rotatably fitted onto the horizontal rotating end (42), wherein, The outer diameter of the cylindrical structure is equal to the outer diameter of the first positioning area (422); In the conveying state, the top end of the elastic telescopic end (41) is higher than the top end of the cylindrical structure; The vertical height of the cylindrical structure is greater than the vertical thickness of the plate.

7. The automotive threaded plate stamping die structure as described in claim 6, characterized in that: The horizontal rotating end (42) is provided with an annular groove (424) on its side, wherein, The cylindrical structure is rotatably disposed in the annular sink (424) via bearings.

8. The automotive threaded plate stamping die structure as described in claim 1, characterized in that: The correction mechanism (4) includes a base (43) and a compression spring (44), wherein, The base (43) is fixed to the top of the lower mold (2), and has a receiving cavity (431) inside it. The compression spring (44) is located inside the receiving cavity (431). The lower end of the elastic telescopic end (41) is slidably fitted in the receiving cavity (431) and abuts against the top of the compression spring (44), while the upper end extends upward through the top of the base (43). The lower end of the horizontal rotating end (42) is rotatably disposed at the bottom of the receiving cavity (431), and the upper end passes through the compression spring (44) and then through the top of the elastic telescopic end (41).

9. The automotive threaded plate stamping die structure as described in claim 8, characterized in that: The top of the horizontal rotating end (42) is provided with a second flange (425), wherein, The second flange (425) has an air cavity (4251) inside, and the bottom of the air cavity (4251) has an air blowing hole (4252). An air passage (426) is provided on the inner side of the horizontal rotating end (42). The upper end of the airway (426) is connected to the air chamber (4251), and the lower end is connected to the receiving chamber (431). The lower side of the elastic telescopic end (41) slides and is sealed to the side wall of the receiving cavity (431); When the elastic telescopic end (41) descends, the gas in the receiving cavity (431) is blown from the air hole (4252) to the outer side of the horizontal rotating end (42).

10. A method for forming automotive threaded plates, characterized in that: The application of the automotive threaded plate stamping die structure as described in any one of claims 1-9 includes the following steps: S1. Install a pair of the correction mechanisms (4) on the top of the lower die (2) and in the area on both sides of the inside tapping machine (3). S2. Fix the upper die (1) to the output end of the servo press and fix the lower die (2) to the worktable of the servo press. S3. When conveying the sheet metal, the first posture correction is performed on the sheet metal to be tapped by the correction mechanism (4), wherein, The sheet material is slidably conveyed on top of the elastic telescopic end (41), and its two sides abut against and roll with the sides of the horizontal rotating end (42) to guide the central axis of the sheet material to coincide with the central axis of the conveying path; S4. When the tapping hole of the plate reaches above the tap (31) of the in-mold tapping machine (3), the feeding is paused; S5. The tap (31) is rotated by the in-mold tapping machine (3), and then the upper die (1) and the lower die (2) are closed by the servo press. During the process, the plate is corrected for the second time by the correction mechanism (4), and then tapped by the tap (31). When the upper mold (1) moves down, it cooperates with the elastic telescopic end (41) to elastically clamp the plate, and the side of the plate slides down along the side of the horizontal rotating end (42) to a new positioning point. During the process, the plate continues to move down, and the tap (31) extends into the tapping hole and rotates to tap. S6. After tapping, the tap (31) reverses direction, and at the same time, the upper die (1) moves upward, and the elastic telescopic end (41) springs back to its original position, driving the plate to move upward, so that the plate separates from the tap (31), completing the thread forming operation of the tapping hole of the plate. The upper mold (1) moves upward and downward at the same speed.

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