Forming and stripping structure for a semi-closed box-shaped bending

Abstract

The utility model discloses a kind of forming demolding structures of semi-closed box-shaped bending piece, including upper die assembly, lower die assembly and elastic drive assembly. Among them, upper die assembly is adjustable punch structure, including upper clamping plate, first upper die plate and the left and right second upper die plate symmetrically arranged in its two sides;Upper clamping plate bottom is equipped with the first guide rail of left and right direction, and second upper die plate is slidably connected to upper clamping plate by the guide rail, and first inclined plane is equipped in the two sides of first upper die plate, and the left and right second upper die plate correspondingly is equipped with second inclined plane, and the both are driven connection by inclined plane. Lower die assembly contains lower stripper plate for carrying blank. Elastic drive assembly includes lower stripper plate elastic member and upper die ejection elastic member, the former provides upward supporting elastic force to lower stripper plate, the latter provides downward reset elastic force to first upper die plate, and the supporting elastic force of lower stripper plate elastic member is greater than the reset elastic force of upper die ejection elastic member. The utility model can solve the difficulty of demolding caused by closing of semi-closed box-shaped piece, improve processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a forming and demolding structure for a semi-enclosed box-shaped bending part. Background Technology

[0002] In the sheet metal processing field, semi-enclosed box-shaped bending parts are widely used in industries such as electronics and machinery due to their compact structure and high space utilization. However, there is a key technical challenge in the forming process of these parts: the closing size after forming is smaller than the punch size, which makes it impossible for the product to be directly detached from the punch, becoming a core bottleneck restricting processing efficiency and product quality.

[0003] In the prior art, solutions for bending sheet metal parts have been explored. For example, Chinese utility model patent application CN202210185950.0, entitled "A High-Efficiency Sheet Metal Bending Machine and Bending Method," discloses a technical solution for sheet metal bending using a segmented upper die pressure head. This solution divides the upper die pressure head into a first pressure head, a second pressure head, and a third pressure head. Each pressure head is independently driven by a hydraulic rod, and in conjunction with a pressure block, a positioning plate, and a pressure sensor, it achieves segmented sequential bending of the sheet metal part, aiming to improve bending accuracy and automation. Specifically, it first uses the third pressure head and then the second pressure head to repeatedly press down to complete the initial bending, and then uses the first pressure head, the second pressure head, and the third pressure head in sequence to straighten and flatten the bent section, while relying on a conveyor belt to achieve feeding and positioning of the sheet metal part.

[0004] However, the aforementioned existing technologies still have significant technical defects and limitations, and cannot solve the demolding problem of semi-enclosed box-shaped bent parts, specifically in the following aspects: The current solution suffers from low processing efficiency and requires multiple steps for forming: Designed for the bending needs of ordinary sheet metal parts, it does not consider the special structure of semi-enclosed box-shaped parts where the "opening is less than the punch". To avoid jamming during demolding, the current actual processing requires a "two-step method": first forming two sides of the part, and then forming the remaining two sides through another process. This results in a lengthy processing flow, occupying multiple punch presses and manpower, and significantly reducing production efficiency.

[0005] The mold occupies a large space and is costly: the segmented pressure head requires an independent hydraulic drive mechanism and matching sensors, the overall structure is complex and the mold volume is large; moreover, the step-by-step processing requires multiple sets of molds to cooperate, which not only increases the design, processing and assembly costs of the mold, but also increases the difficulty and cost of later maintenance.

[0006] Forming accuracy is easily affected: During multi-step processing, parts need to be positioned and transferred multiple times, which can easily lead to positioning errors. This results in a decrease in the consistency of bending angles and dimensions on each side, especially affecting the accuracy of the opening of semi-enclosed box-shaped parts, which may cause difficulties in subsequent assembly.

[0007] In summary, while existing technologies have improved the bending accuracy and automation of ordinary sheet metal parts, they have not provided an effective solution to the core technical problem of "difficult demolding after forming" of semi-enclosed box-shaped bent parts. This results in the continued difficulties of low efficiency, high cost, and poor precision in the processing of such parts. Therefore, there is an urgent need for a technical solution that can achieve single-step forming and smooth demolding of semi-enclosed box-shaped bent parts to overcome the shortcomings of existing technologies. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a forming and demolding structure for a semi-enclosed box-shaped bending part, which can solve the problem of demolding difficulty caused by the closing of the semi-enclosed box-shaped part and improve processing efficiency.

[0009] To solve the above-mentioned technical problems, this utility model discloses a forming and demolding structure for a semi-enclosed box-shaped bending part, including an upper mold assembly, a lower mold assembly and an elastic drive assembly; The upper die assembly is an adjustable punch structure for forming semi-enclosed box-shaped bending parts, including an upper clamping plate, a first upper die plate, and a second upper die plate; the bottom of the upper clamping plate is provided with a first guide rail, and the second upper die plate is slidably connected to the upper clamping plate through the first guide rail, wherein the first guide rail is configured to slide in the left and right direction; The second upper template includes a left second upper template and a right second upper template symmetrically arranged on both sides of the first upper template; the left and right sides of the first upper template are respectively provided with a first inclined surface, and the right side of the left second upper template and the left side of the right second upper template are respectively provided with a second inclined surface that corresponds to and fits against the first inclined surface; the first upper template and the second upper template are connected by transmission through the first inclined surface and the second inclined surface. The lower die assembly includes a lower stripper plate, which is used to support the blank of the semi-enclosed box-shaped bending part and is located directly below the upper die assembly; The elastic drive assembly includes a lower ejector plate elastic element and an upper mold ejection elastic element. The lower ejector plate elastic element is disposed within the lower mold assembly and provides an upward supporting elastic force to the lower ejector plate. The upper mold ejection elastic element is disposed within the upper mold assembly and provides a downward resetting elastic force to the first upper mold plate. The supporting elastic force of the lower ejector plate elastic element is greater than the resetting elastic force of the upper mold ejection elastic element.

[0010] As an optional implementation, the first inclined plane and the second inclined plane have the same inclination angle, and the inclination angle is 30°-60°.

[0011] As another optional implementation, a lubricating coating is provided between the mating surfaces of the first inclined surface and the second inclined surface.

[0012] As another optional implementation, the upper clamping plate is fixedly disposed above the first upper template to limit the maximum upward stroke of the first upper template.

[0013] As another optional implementation, the first upper template is a trapezoid, the bottom left corner of the left second upper template is a right angle, and the bottom right corner of the right second upper template is a right angle; When the first upper template moves upward, it pushes the left second upper template and the right second upper template to slide outward through the first inclined surface and the second inclined surface, thereby expanding the bottom size of the upper mold assembly; When the first upper template moves downward, it drives the left second upper template and the right second upper template to slide inward through the first inclined surface and the second inclined surface, thereby reducing the size of the bottom end of the upper mold assembly.

[0014] As another optional implementation, the lower mold assembly further includes a lower mold base and a lower left template and a lower right template fixed on the lower mold base; the lower ejector plate is disposed on the lower mold base and located between the lower left template and the lower right template; the two ends of the elastic member of the lower ejector plate abut against the bottom surface of the lower ejector plate and the top surface of the lower mold base, respectively. The bottom left corner of the second upper left template and the bottom right corner of the second upper right template both serve as bending punches. The right side of the lower left template and the left side of the lower right template are used to assist the bending punches in stamping and forming.

[0015] As another optional implementation, the upper mold assembly further includes an upper mold base; the upper clamping plate is fixed to the bottom of the upper mold base; the number of upper mold ejector elastic members is at least two, evenly distributed on the top of the first upper mold plate; one end of the upper mold ejector elastic member is fixed to the top surface of the first upper mold plate, and the other end passes through the through hole of the upper clamping plate and is fixed to the upper mold base; the through hole of the upper clamping plate just passes through the upper mold ejector elastic member.

[0016] As another optional implementation, the left side of the left second upper template and the right side of the right second upper template are provided with limiting bosses. The outer side of the upper mold assembly is fitted with a fixing sleeve, and the inner wall of the fixing sleeve is provided with a limiting groove that matches the limiting boss. The limiting boss slides along the limiting groove to limit the maximum left and right sliding stroke of the second upper template and prevent the second upper template from detaching from the first upper template.

[0017] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: This utility model embodiment employs a dual-guide design: a first guide rail on the bottom of the upper clamping plate in the left and right directions, combined with a guide rail structure consisting of a first inclined plane and a second inclined plane. On one hand, the first guide rail strictly limits the sliding direction of the second upper mold plate, preventing offset and jamming during left and right sliding and ensuring precise dimensional adjustment. On the other hand, leveraging the force transmission characteristics of the inclined plane, the up-and-down movement of the first upper mold plate is efficiently converted into the left-and-right sliding of the second upper mold plate, making the adjustment of the bottom dimensions of the upper mold assembly smoother and more responsive, thus improving the stability and precision of the structural movement. The elastic drive assembly features a force difference design where the supporting elastic force of the lower ejector plate is greater than the resetting elastic force of the upper mold ejector plate. During the stamping stage, the lower ejector plate can stably support the blank, preventing displacement due to insufficient elastic force of the elastic component. After completion, the upper mold assembly is automatically reset by utilizing the elastic difference, and the second upper mold plate slides along the first guide rail to achieve demolding. No additional demolding power mechanism is required, simplifying the demolding process, improving the automation and reliability of demolding, and effectively shortening the production cycle. The adjustable punch structure drives the second upper mold plate to slide left and right through the up and down movement of the first upper mold plate, which can flexibly adjust the outer dimensions of the bottom of the upper mold assembly. This not only adapts to the forming requirements of semi-enclosed box-shaped bending parts of different specifications, enhancing the versatility of the structure, but also allows for precise reduction in size during forming to fit the blank and achieve high-quality bending. During demolding, the size expands to facilitate smooth product removal, completely solving the problem of demolding difficulties caused by the closing of semi-enclosed box-shaped parts, ensuring the forming quality of products such as bending angle and dimensional accuracy, and reducing the scrap rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the forming and demolding structure of a semi-enclosed box-shaped bent part disclosed in an embodiment of this utility model, and its positional relationship is the state of the bent part; Figure 2 This is another structural schematic diagram of a forming and demolding structure for a semi-enclosed box-shaped bent part disclosed in an embodiment of this utility model, and the positional relationship is the state after the bent part is formed; Figure 3 This is a structural schematic diagram of a semi-enclosed box-shaped bending component disclosed in an embodiment of this utility model. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0021] See Figures 1-3 This utility model discloses a forming and demolding structure for a semi-enclosed box-shaped bending part A, including an upper mold assembly 1, a lower mold assembly 2 and an elastic drive assembly; The upper die assembly 1 is an adjustable punch structure for forming a semi-enclosed box-shaped bending part A, including an upper clamping plate 10, a first upper template 11, and a second upper template; the bottom of the upper clamping plate 10 is provided with a first guide rail 4, and the second upper template is slidably connected to the upper clamping plate 10 through the first guide rail 4, and the first guide rail 4 is a sliding guide rail in the left and right direction. The second upper template includes a left second upper template 12 and a right second upper template 13 symmetrically arranged on both sides of the first upper template 11; the left and right sides of the first upper template 11 are respectively provided with a first inclined surface 14, and the right side of the left second upper template 12 and the left side of the right second upper template 13 are respectively provided with a second inclined surface 15 corresponding to and fitting with the first inclined surface 14. The first upper template 11 and the second upper template are connected by the first inclined surface 14 and the second inclined surface 15, and the first inclined surface 14 and the second inclined surface 15 form an inclined surface guide rail cooperation structure. The second upper template slides left and right along the first guide rail 4 under the thrust of the first upper template 11 moving up and down, through the inclined surface guide rail cooperation structure and the guidance of the first guide rail 4, so as to adjust the overall bottom dimensions of the upper mold assembly 1. The lower die assembly 2 includes a lower stripper plate 21, which is used to support the blank of the semi-enclosed box-shaped bending part A and is located directly below the upper die assembly 1. The elastic drive assembly includes a lower ejector plate elastic element 31 and an upper mold ejection elastic element 32. The lower ejector plate elastic element 31 is disposed in the lower mold assembly 2 and provides an upward supporting elastic force to the lower ejector plate 21. The upper mold ejection elastic element 32 is disposed in the upper mold assembly 1 and provides a downward reset elastic force to the first upper mold plate 11. The supporting elastic force of the lower ejector plate elastic element 31 is greater than the reset elastic force of the upper mold ejection elastic element 32.

[0022] This utility model embodiment employs a dual-guide design with a "first guide rail 4 in the left and right directions at the bottom of the upper clamping plate + a guide rail structure with a first inclined surface 14 and a second inclined surface 15." On one hand, the first guide rail 4 strictly limits the sliding direction of the second upper template, preventing offset and jamming during left and right sliding and ensuring the accuracy of dimensional adjustment. On the other hand, by utilizing the force transmission characteristics of the inclined surface, the up-and-down movement of the first upper template is efficiently converted into the left and right sliding of the second upper template, making the adjustment of the bottom dimension of the upper mold assembly more stable and responsive, thus improving the stability and accuracy of the structural movement. The force difference design in the elastic drive assembly, where "the supporting elastic force of the lower ejector plate is greater than the reset elastic force of the upper mold ejector plate," ensures that the lower ejector plate can stably support the blank during the stamping stage, preventing displacement of the blank due to insufficient elastic force of the elastic component. After forming, the upper mold assembly is automatically reset by utilizing the elasticity difference, and the second upper mold plate slides along the first guide rail 4 to achieve demolding. No additional demolding power mechanism is required, simplifying the demolding process, improving the automation and reliability of demolding, and effectively shortening the production cycle. The adjustable punch structure drives the second upper mold plate to slide left and right through the up and down movement of the first upper mold plate, which can flexibly adjust the outer dimensions of the bottom of the upper mold assembly. This not only adapts to the forming requirements of semi-enclosed box-shaped bending parts of different specifications, enhancing the versatility of the structure, but also allows for precise reduction in size during forming to fit the blank and achieve high-quality bending. During demolding, the size expands to facilitate smooth product removal, completely solving the problem of demolding difficulties caused by the closing of semi-enclosed box-shaped parts, ensuring the forming quality of products such as bending angle and dimensional accuracy, and reducing the scrap rate.

[0023] In an optional embodiment, the first inclined surface 14 and the second inclined surface 15 have the same inclination angle, which is 30°-60°. This angle range ensures that the vertical force of the first upper mold plate 11 is efficiently converted into the lateral force of the second upper mold plate, avoiding insufficient thrust due to an angle that is too small or sliding jamming due to an angle that is too large, thus ensuring smooth size adjustment; the uniform angle makes the inclined surfaces fit better, reduces local stress concentration, and extends the service life of the mold.

[0024] In another optional embodiment, a lubricating coating is provided between the mating surfaces of the first inclined surface 14 and the second inclined surface 15. The lubricating coating may be a polytetrafluoroethylene coating, used to reduce the sliding friction resistance of the inclined guide rail mating structure and extend the service life of the component.

[0025] In another optional embodiment, the upper clamping plate 10 is fixedly disposed above the first upper template 11 to limit the maximum upward stroke of the first upper template 11.

[0026] In another optional embodiment, the first upper template 11 is a trapezoid, the bottom left corner of the left second upper template 12 is a right angle, and the bottom right corner of the right second upper template 13 is a right angle; When the first upper template 11 moves upward, it pushes the left second upper template 12 and the right second upper template 13 to slide outward respectively through the first inclined surface 14 and the second inclined surface 15, thereby expanding the bottom size of the upper mold assembly 1; When the first upper template 11 moves downward, it drives the left second upper template 12 and the right second upper template 13 to slide inward through the first inclined surface 14 and the second inclined surface 15, thereby reducing the size of the bottom end of the upper mold assembly 1.

[0027] In this embodiment, the right-angled edge is directly used as the bending edge.

[0028] In another optional embodiment, the lower mold assembly 2 further includes a lower mold base 22 and a lower left template 23 and a lower right template 24 fixed on the lower mold base 22; the lower ejector plate 21 is disposed on the lower mold base 22 and located between the lower left template 23 and the lower right template 24; the two ends of the lower ejector plate elastic member 31 abut against the bottom surface of the lower ejector plate 21 and the top surface of the lower mold base 22, respectively; The bottom left corner of the second upper left template 12 and the bottom right corner of the second upper right template 13 both serve as bending punches. The right side of the lower left template 23 and the left side of the lower right template 24 are used to assist the bending punches in stamping and forming.

[0029] Optionally, the lower mold base 22 is also provided with a lower pad 25, and the lower left template 23 and the lower right template 24 are fixed on the lower pad 25 for easy replacement.

[0030] In another optional embodiment, the upper mold assembly 1 further includes an upper mold base 16; the upper clamping plate 10 is fixed to the bottom of the upper mold base 16; the number of upper mold ejection elastic elements 32 is at least two, evenly distributed on the top of the first upper mold plate 11; one end of the upper mold ejection elastic element 32 is fixed to the top surface of the first upper mold plate 11, and the other end passes through the through hole of the upper clamping plate 10 and is fixed to the upper mold base 16; the through hole of the upper clamping plate 10 just passes through the upper mold ejection elastic element 32. The upper mold ejection elastic element 32 may specifically be a spring or a telescopic rod with a built-in spring.

[0031] Optionally, a second guide rail (not shown in the figure) may be provided between the first inclined surface 14 and the second inclined surface 15, and the first upper template 11 and the second upper template may be connected by transmission through the second guide rail.

[0032] In another optional embodiment, a limiting boss (not shown in the figure) is provided on the left side of the left second upper template and the right side of the right second upper template. A fixing sleeve is fitted on the outer side of the upper mold assembly, and the inner wall of the fixing sleeve is provided with a limiting groove that matches the limiting boss. The limiting boss slides along the limiting groove to limit the maximum left and right sliding stroke of the second upper template and prevent the second upper template from detaching from the first upper template.

[0033] The forming and demolding method for the semi-enclosed box-shaped bent part of this utility model includes the following steps: S1: Place the blank of the semi-enclosed box-shaped bending part on the top surface of the lower stripper plate, start the punch press, and the punch press will drive the upper die assembly to move downwards towards the lower die assembly.

[0034] S2: When the bottom end of the upper die assembly contacts the blank, the punch press continues to descend until it stops at the bottom dead center, completing the stamping of the semi-enclosed box-shaped bending part.

[0035] When the bottom end of the upper die assembly contacts the blank, the lower ejector plate remains stationary because the elastic force of the lower ejector plate is greater than the elastic force of the upper die ejector plate. The first upper die plate is pushed upward by the lower ejector plate and moves vertically. The first inclined surface of the first upper die plate is driven by the second inclined surfaces of the left and right second upper die plates, pushing the left second upper die plate to slide to the left and the right second upper die plate to slide to the right. Until the top surface of the first upper die plate contacts the upper stop plate, the first upper die plate stops moving upward. At this time, the outer dimensions of the bottom end of the upper die assembly are consistent with the inner cavity design dimensions of the semi-enclosed box-shaped bending part. The press continues to move downward, and the pressure of the upper die assembly on the blank gradually increases and exceeds the elastic force of the lower ejector plate. The lower ejector plate moves downward, and the upper die assembly continues to apply bending pressure to the blank until the press reaches the bottom dead center, the die is completely closed, and the semi-enclosed box-shaped bending part is formed.

[0036] S3: The punch press begins to move upwards until it reaches the top dead center.

[0037] When the punch press begins to move upward, the upper die assembly moves upward synchronously with the punch press. When the bottom end of the first upper die plate begins to separate from the top surface of the lower stripper plate, the first upper die plate resets downward under the elastic force of the upper die ejector elastic element. The first inclined surface of the first upper die plate drives the left second upper die plate to slide to the right and the right second upper die plate to slide to the left through the contact and transmission with the second inclined surfaces of the left and right second upper die plates. This continues until both the first and second upper die plates reach their respective end points of travel. At this point, the outer dimensions of the bottom end of the upper die assembly are smaller than the inner diameter of the semi-enclosed box-shaped bending part. The punch press continues to move upward to the top dead center, and the operator or automated equipment removes the formed semi-enclosed box-shaped bending part from the upper die assembly, thus completing one forming and demolding process.

[0038] Based on a dynamically adjustable forming and demolding structure, the process is completed in three steps: "blank placement → punch press descent forming → punch press descent demolding." Automatic adjustment is achieved through the linkage of the inclined guide rail of the upper die assembly and the elastic force ratio of the elastic components. Only three core steps are needed to complete the entire "forming + demolding" process, eliminating the need for the multi-step processes of traditional methods such as "pre-bending → staged forming → forced demolding," significantly shortening the processing cycle and making it suitable for mass production. Relying on the inclined guide rail and the driving force of the elastic components, no manual intervention is required for the dimensional adjustment process, reducing human error. Precise forming is achieved by dynamically enlarging the size of the upper die assembly during the downward movement of the punch press, and unobstructed demolding is achieved by shrinking the size during the upward movement. This solves the industry pain point of "easy forming, difficult demolding" for semi-enclosed box-shaped parts, improving product qualification rates.

[0039] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A forming and demolding structure for a semi-enclosed box-shaped bent part, characterized in that, Includes upper mold assembly, lower mold assembly, and elastic drive assembly; The upper die assembly is an adjustable punch structure for forming semi-enclosed box-shaped bending parts, including an upper clamping plate, a first upper die plate, and a second upper die plate; the bottom of the upper clamping plate is provided with a first guide rail, and the second upper die plate is slidably connected to the upper clamping plate through the first guide rail, wherein the first guide rail is configured to slide in the left and right direction; The second upper template includes a left second upper template and a right second upper template symmetrically arranged on both sides of the first upper template; the left and right sides of the first upper template are respectively provided with a first inclined surface, and the right side of the left second upper template and the left side of the right second upper template are respectively provided with a second inclined surface that corresponds to and fits against the first inclined surface; the first upper template and the second upper template are connected by transmission through the first inclined surface and the second inclined surface. The lower die assembly includes a lower stripper plate, which is used to support the blank of the semi-enclosed box-shaped bending part and is located directly below the upper die assembly; The elastic drive assembly includes a lower ejector plate elastic element and an upper mold ejection elastic element. The lower ejector plate elastic element is disposed within the lower mold assembly and provides an upward supporting elastic force to the lower ejector plate. The upper mold ejection elastic element is disposed within the upper mold assembly and provides a downward resetting elastic force to the first upper mold plate. The supporting elastic force of the lower ejector plate elastic element is greater than the resetting elastic force of the upper mold ejection elastic element.

2. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, The first inclined plane and the second inclined plane have the same inclination angle, and the inclination angle is 30°-60°.

3. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, A lubricating coating is provided between the mating surfaces of the first inclined surface and the second inclined surface.

4. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, The upper clamp is fixed above the first upper template and is used to limit the maximum upward stroke of the first upper template.

5. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, The first upper template is a trapezoid, the bottom left corner of the left second upper template is a right angle, and the bottom right corner of the right second upper template is a right angle; When the first upper template moves upward, it pushes the left second upper template and the right second upper template to slide outward through the first inclined surface and the second inclined surface, thereby expanding the bottom size of the upper mold assembly; When the first upper template moves downward, it drives the left second upper template and the right second upper template to slide inward through the first inclined surface and the second inclined surface, thereby reducing the size of the bottom end of the upper mold assembly.

6. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, The lower mold assembly also includes a lower mold base and a lower left template and a lower right template fixed on the lower mold base; the lower ejector plate is disposed on the lower mold base and located between the lower left template and the lower right template; the two ends of the elastic member of the lower ejector plate abut against the bottom surface of the lower ejector plate and the top surface of the lower mold base, respectively. The bottom left corner of the second upper left template and the bottom right corner of the second upper right template both serve as bending punches. The right side of the lower left template and the left side of the lower right template are used to assist the bending punches in stamping and forming.

7. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 4, characterized in that, The upper mold assembly further includes an upper mold base; the upper clamping plate is fixed to the bottom of the upper mold base; there are at least two upper mold ejector elastic elements, which are evenly distributed on the top of the first upper mold plate; one end of the upper mold ejector elastic element is fixed to the top surface of the first upper mold plate, and the other end passes through the through hole of the upper clamping plate and is fixed to the upper mold base; the through hole of the upper clamping plate just passes through the upper mold ejector elastic element.

8. The forming and demolding structure for the semi-enclosed box-shaped bent part according to claim 1, characterized in that, The left side of the left second upper template and the right side of the right second upper template are provided with limiting bosses. The outer side of the upper mold assembly is fitted with a fixing sleeve. The inner wall of the fixing sleeve is provided with a limiting groove that matches the limiting boss. The limiting boss slides along the limiting groove to limit the maximum left and right sliding stroke of the second upper template and prevent the second upper template from detaching from the first upper template.

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