A hinge processing method

Abstract

This invention proposes a hinge processing method, comprising the following steps: S0: blank pretreatment; S1: countersunk punching; S2: processing of several steps within a combined mold; S3: pressure holding, deburring, and final inspection of the finished product. The processing method of this invention includes S1 countersunk punching and S2 processing of several steps within a combined mold. Furthermore, in S2, the combined mold continuously processes the blank through one punching stroke, achieving flanging, head shaping, top punching, and side punching. Therefore, this invention achieves hinge arm processing and forming through two steps, eliminating the previous need for 4-6 sets of molds, which resulted in cumbersome processes, lengthy production flows, and reduced production efficiency. It also reduces the number of operators, lowers manual scheduling and equipment maintenance costs, and eliminates the cumulative errors caused by workpiece transfer and repeated positioning between processes, improving dimensional accuracy and assembly compatibility.

Description

Technical Field

[0001] This invention relates to the field of hinge processing technology, and more specifically to a hinge processing method. Background Technology

[0002] Cushion hinges, a common hardware accessory, are widely used in doors, windows, furniture, bags, and other products, providing core functions such as cushioning, shock absorption, and impact protection. Compared to ordinary hinges, cushioned hinges have a more complex structure, generally assembled from multiple components including the hinge cup, hinge arm, and mounting base. The hinge arm, as a key load-bearing component, requires multiple processing steps in its manufacturing process, including flanging, head shaping, top punching, and side punching. The processing precision directly affects the overall performance and lifespan of the cushioned hinge.

[0003] In traditional manufacturing processes, for hardware parts with special shapes and structures like hinge arms, the previous multi-process manufacturing of hinge arms required dedicated high-precision molds for each process. The entire process required 4-6 sets of molds, with the hinge arm placed sequentially in multiple molds for processing. This method has several drawbacks: First, the cumbersome process leads to a lengthy production flow, with the processing time for a single hinge arm increasing by 30%-40% compared to ordinary hardware parts, significantly reducing production efficiency and making it difficult to meet the needs of large-scale mass production. Second, multiple processes require multiple processing machines and multiple operators, significantly increasing labor scheduling and equipment maintenance costs, thus increasing overall costs. Third, the transfer and repeated positioning of workpieces between processes can easily generate cumulative errors, with positioning deviations reaching 0.03-0.08mm, directly affecting the dimensional accuracy and assembly compatibility of the hinge arm.

[0004] The aforementioned problems not only restrict the market promotion and cost-effectiveness improvement of buffer hinges, but also make it difficult to meet the flexibility requirements of small and medium batch customized production. Therefore, there is an urgent need for a hinge processing method that can simplify the processing steps, reduce mold investment, and improve dimensional accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a hinge processing method that does not have at least one of the disadvantages mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hinge processing method, comprising the following steps:

[0007] S0: Billet pretreatment;

[0008] Cut the original metal sheet into blanks according to the unfolded dimensions of the hinge arm; remove oil and oxide layers from the surface of the blanks;

[0009] S1: Countersunk hole stamping;

[0010] The pre-treated blank is positioned into a special countersunk die and stamped to form the required countersunk hole;

[0011] S2: Several processing steps are performed within the combined mold;

[0012] The qualified blanks in S1 are transferred to the integrated combination mold, and the following processes are completed:

[0013] S2.1: Flanging and shaping; by combining the flanging die and punch in the mold, the two sides of the blank are folded and shaped to achieve the bending of the two side plates of the blank.

[0014] S2.2: Head shaping; Based on the blank reference after flanging, the end of the blank is pressed and shaped by the head shaping module;

[0015] S2.3: Top punching; A through hole is punched at a preset position on the head of the blank by using the top punch in the combined mold;

[0016] S2.4: Side punching; Based on the position reference of the top through hole, several round holes are punched at preset positions on the side of the blank through the side punching module;

[0017] S3: Pressure holding, deburring, and final inspection of finished products;

[0018] In S2, the blank is flanging, head shaping, top punching, and side punching are achieved in one stamping stroke of the combined mold continuous processing.

[0019] Furthermore, the combined mold includes a fixed lower mold and a movable upper mold. The lower mold is provided with a positioning groove that mates with the countersunk hole, and the movable upper mold is provided with an elastic pressing block for elastically pressing the non-processed area of ​​the blank.

[0020] Furthermore, the movable upper die includes a punch head and a V-shaped punch block that is elastically connected to the punch head and used to bend the two side plates of the blank. The elastic pressure block is elastically connected inside the V-shaped punch block. After the elastic pressure block elastically presses the non-processed area in the blank, the V-shaped punch block presses down and bends the two side plates of the blank.

[0021] Furthermore, the V-shaped stamping block has a head shaping module inside; a support plate is elastically connected to the fixed lower die aligned with the end of the blank to be shaped. The support plate is stationary during step S2.1, and the top of the support plate is always in contact with the bottom of the blank during step S2.1. In step S2.2, the support plate moves with the head shaping module. When the head shaping module moves to the end of its stroke, the support plate is embedded in the fixed lower die, and the top of the support plate smoothly transitions with the top of the fixed lower die.

[0022] Furthermore, a vertical rod is fixedly connected to the stamping head, which penetrates the top of the V-shaped stamping block. A vertical cutting head for punching holes in the top of the blank is fixedly connected to the vertical rod inside the V-shaped stamping block. In steps S2.1 and S2.2, there is a gap between the vertical cutting head and the blank. When step S2.2 is completed, as the stamping head continues to move downward, the vertical cutting head punches holes in the top of the blank.

[0023] Furthermore, a first cylinder is fixedly connected to each side of the V-shaped stamping block. The first cylinder is filled with hydraulic oil and has a first piston rod inside. The first piston rod is slidably connected to the stamping head, and a push plate is provided on the first piston rod. When step S2.3 ends, the stamping head abuts against the push plate. The bottom of the first cylinder is connected to an oil outlet pipe, and several oil outlet pipes are respectively connected to several second cylinders fixed to both sides of the V-shaped stamping block. The end of the second piston rod in the second cylinder is provided with a transverse punching head for punching holes in the blank side plate.

[0024] Furthermore, a push rod is slidably connected inside the second piston rod, and a sliding cavity is provided inside the second piston rod. The end of the push rod is provided with a movable plate that is slidably connected to the sliding cavity. A spring is provided between the movable plate and the end of the sliding cavity. The end of the push rod is a hemispherical head. During the non-punching process, the hemispherical head extends out of the second piston rod under the action of the spring.

[0025] Furthermore, the V-shaped stamping block is provided with a fixed cavity, and a push plate is fixedly connected to the second piston rod and slidably connected to the fixed cavity. The fixed cavity is provided with a limiting platform, and the push plate slides between the limiting platform and the end wall of the fixed cavity away from the second cylinder body. The push plate and the end wall of the fixed cavity near the second cylinder body are connected by a tension spring.

[0026] Furthermore, the V-shaped stamping block has several waste grooves inside.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: The processing method of the present invention includes S1 countersunk punching and S2 processing in a combination mold; and in one stamping stroke of the combination mold in S2, the blank is flanging, head shaping, top punching and side punching are realized. Therefore, the present invention realizes the processing and forming of the hinge arm by adopting two processes; it eliminates the problem of the previous need to configure 4-6 sets of molds, which led to complicated processes, long production process and reduced production efficiency; it also reduces the number of operators, reduces manual scheduling and equipment maintenance costs; and it eliminates the cumulative error caused by workpiece transfer and repeated positioning between processes, which improves dimensional accuracy and assembly compatibility. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the workflow of the present invention;

[0030] Figure 2 A schematic diagram of the overall structure of the hinge;

[0031] Figure 3 This is a schematic diagram of the overall structure of the hinge arm;

[0032] Figure 4 This is a schematic diagram of the forming structure of the blank after step S1;

[0033] Figure 5 This is a schematic diagram of the overall structure of the combined mold;

[0034] Figure 6 for Figure 5 A partial cross-sectional view of the mid-lateral direction;

[0035] Figure 7 for Figure 5 A partial sectional view along the mid-length axis;

[0036] Figure 8 This is a schematic diagram of the structure of the hinged arm after stamping, located on the fixed lower die;

[0037] Figure 9 This is a schematic diagram of the overall structure of the fixed lower mold before processing;

[0038] Figure 10 This is a schematic diagram of the overall structure of the elastic pressure block.

[0039] The components include: 1. Hinge arm; 2. I-shaped hole; 3. Countersunk hole; 4. Punch head; 5. Fixed lower die; 6. V-shaped punch block; 7. Vertical punch head; 8. First cylinder; 9. Second cylinder; 10. Scrap trough; 11. Hemispherical head; 12. Horizontal punch head; 13. Second piston rod; 14. First piston rod; 15. Fixed cavity; 16. Sliding cavity; 17. Tension spring; 18. Elastic pressure block; 19. Support plate; 20. Head shaping module. Detailed Implementation

[0040] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0041] Example: Please refer to Figure 1-4 A hinge manufacturing method includes the following steps:

[0042] S0: Blank pretreatment; the original metal sheet is cut into blanks according to the unfolded dimensions of hinge arm 1; then the oil and oxide layer on the surface of the blanks are removed;

[0043] S1: Countersunk Hole 3 Stamping Forming; The pre-treated blank is positioned in a special countersunk hole 3 stamping die to form the required countersunk hole 3. This is the first stamping, which serves two purposes: firstly, to form the countersunk hole 3, facilitating rapid positioning in subsequent processes; secondly, since the countersunk hole 3 in the hinge arm 1 also has a groove inside, this part of the structure is divided into two stamping processes, reducing the overall deformation in step S1 and improving the forming accuracy of the countersunk hole 3, thereby improving the subsequent positioning accuracy; in addition, since the top of the hinge arm 1 also has an I-shaped hole 2 and a round hole, and the I-shaped hole 2 is located between the round hole and the groove, in step S1, during the forming of the countersunk hole 3, the round hole is also punched; the I-shaped hole 2 is left to be punched in a subsequent process. Compared with the previous one-time stamping forming of the top of the hinge arm 1, the number of punching positions in the synchronous stamping process is reduced, thereby reducing the influence between the punching forces during stamping at various points, and thus improving the punching quality at various points.

[0044] S2: Several processing steps are performed within the combined mold;

[0045] The qualified blanks in S1 are transferred to the integrated combination mold, and the following processes are completed:

[0046] S2.1: Flanging and shaping; by combining the flanging die and punch in the mold, the two sides of the blank are folded and shaped to achieve the bending of the two side plates of the blank.

[0047] S2.2: Head shaping; Based on the blank reference after flanging, the end of the blank is pressed and shaped by the head shaping module 20;

[0048] S2.3: Top punching; A through hole is punched at a preset position on the head of the blank by using the top punch in the combined mold;

[0049] S2.4: Side punching; Based on the position reference of the top through hole, several round holes are punched at preset positions on the side of the blank through the side punching module;

[0050] S3: Pressure holding, deburring, and final inspection of finished products;

[0051] In S2, the blank is flanging, head shaping, top punching, and side punching are achieved in one stamping stroke of the combined mold. Therefore, the present invention achieves the processing and forming of the hinge arm 1 by adopting two processes. It eliminates the problem of the previous need to configure 4-6 sets of molds, which led to complicated processes, long production processes, and reduced production efficiency. It also reduces the number of operators, reduces manual scheduling and equipment maintenance costs, and eliminates the cumulative error caused by workpiece transfer and repeated positioning between processes, thus improving dimensional accuracy and assembly compatibility.

[0052] Please refer to Figure 5-10 The combined mold includes a fixed lower mold 5 and a movable upper mold. The lower mold has a positioning groove that mates with the countersunk hole 3. The movable upper mold has an elastic pressure block 18 for elastically pressing the non-processed area of ​​the blank, thereby pressing the blank and preventing movement during subsequent processing. The movable upper mold includes a punch head 4 and a V-shaped punch block 6 elastically connected to the punch head 4 and used for bending the two side plates of the blank. The elastic pressure block 18 is elastically connected inside the V-shaped punch block 6. After the elastic pressure block 18 elastically presses the non-processed area of ​​the blank, The V-shaped stamping block 6 presses down and bends the two side plates of the blank; while the elastic pressure block 18 is provided with a stamping opening that is aligned with the position of the pre-punched slot and I-shaped hole 2 at the top of the hinge arm 1. The stamping opening is slightly larger than the slot and I-shaped hole 2, which facilitates the punching and forming of the slot and I-shaped hole 2. The elastic connection between the elastic pressure block 18 and the V-shaped stamping block 6 adopts the form of a guide post and a spring connection. When the stamping head 4 moves down, it will compress the spring here, thereby achieving elastic pressing of the blank and preventing the blank from moving during bending.

[0053] In one embodiment, the V-shaped stamping block 6 has a head shaping module 20 inside; a support plate 19 is elastically connected to the fixed lower die 5, which is aligned with the end of the blank to be shaped. The support plate 19 is stationary during step S2.1, and its top is always in contact with the bottom of the blank during this step. In step S2.2, the support plate 19 moves with the head shaping module 20. When the head shaping module 20 reaches its stroke end, the support plate 19 is embedded in the fixed lower die 5. The top of the support plate 19 smoothly transitions to the top of the fixed lower mold 5. The support plate 19 and the fixed lower mold 5 are elastically connected by a moving column and a spring. During bending, the elastic force provided by the spring is greater than the pressure on the blank during bending, thereby ensuring the stability of the bending process. In this embodiment, the support plate 19 is located at the plane in the head shaping module 20, which facilitates the forming of the blank end. Therefore, the design of the support plate 19 combines head shaping and flanging shaping, which greatly improves the processing efficiency.

[0054] In one embodiment, a vertical rod is fixedly connected to the punch head 4, penetrating the top of the V-shaped punch block 6. A vertical cutting head 7 for punching the top of the blank is fixedly connected to the vertical rod inside the V-shaped punch block 6. In steps S2.1 and S2.2, there is a gap between the vertical cutting head 7 and the blank. When step S2.2 is completed and the punch head 4 continues to move downward, the vertical cutting head 7 punches the top of the blank. The V-shaped punch block 6 and the punch head 4 are elastically connected by a guide post and... The spring is designed so that the force causing the spring to deform at this point is less than the maximum force exerted on the V-shaped stamping block 6 by the blank during bending. When the spring is compressed by 2-3mm, the elastic force generated will be greater than the maximum force exerted on the V-shaped stamping block 6 by the blank during bending. This ensures that the bending force on the blank changes continuously in the short time immediately after bending, rather than changing abruptly, thereby improving the bending quality. At the same time, a stable downward bending force is reached after 2-3mm, further improving the bending quality.

[0055] Therefore, after bending is completed, the punching head 4 continues to move downward, thereby driving the vertical punching head 7 to move downward, punching the slot and I-shaped hole 2 on the blank. By changing the distance between the slot and the I-shaped hole 2 and the two punching heads in the vertical punching head 7, the slot can be punched first, and then the I-shaped hole 2 can be punched. This ensures that there are through holes on both sides of the I-shaped hole 2 during punching, thereby improving the consistency of the material deformation performance on both sides of the I-shaped hole 2 and thus improving the punching quality of the I-shaped hole 2. At the same time, according to this punching sequence, when punching the slot, the distance between the slot and the round hole is relatively large, which also ensures the consistency of the material deformation performance near the slot, thereby improving the punching quality of the slot.

[0056] In one embodiment, a first cylinder 8 is fixedly connected to each side of the V-shaped stamping block 6. The first cylinder 8 is filled with hydraulic oil and has a first piston rod 14 inside. The first piston rod 14 is slidably connected to the stamping head 4 and has a push plate on it. The bottom of the first cylinder 8 is connected to an oil outlet pipe, and several oil outlet pipes are respectively connected to several second cylinders 9 fixed to both sides of the V-shaped stamping block 6. The end of the second piston rod 13 in the second cylinder 9 is provided with a transverse punching head 12 for punching holes in the blank side plate. Since the two side plates of the hinge arm 1 have three sets of two on the same axis... The V-shaped stamping block 6 has three second cylinders 9 on each side. The three second cylinders 9 are connected to the oil outlet pipe of the first cylinder 8 through a hydraulic cylinder. Therefore, when step S2.3 ends, the stamping head 4 will abut against the push plate. Then the stamping head 4 will continue to move down, driving the push plate to move down, thereby causing the first piston rod 14 to move down, which in turn pushes the hydraulic oil into the second cylinder 9. The hydraulic oil will push the transverse punching head 12 to punch the round holes on the side plate. The punching method greatly improves the coaxiality of the two round holes in the same group, which facilitates the subsequent installation of the buffer hinge.

[0057] In one embodiment, both the vertical cutting head 7 and the horizontal cutting head 12 are equipped with a scrap pushing mechanism. Taking the scrap pushing mechanism on the horizontal cutting head 12 as an example, the scrap pushing mechanism includes a push rod that is slidably connected to the inside of the second piston rod 13, and the inside of the second piston rod 13 is provided with a sliding cavity 16. The end of the push rod is provided with a movable plate that is slidably connected to the sliding cavity 16. A spring is provided between the movable plate and the end of the sliding cavity 16. The end of the push rod is a hemispherical head 11, which can push out the cutting scrap and prevent the scrap from getting stuck on the horizontal cutting head 12. Secondly, since the hemispherical head 11 extends the second piston rod 13 under the action of the spring during the non-punching process, when punching, the hemispherical head 11 first squeezes the punching position, so that the punching position is concave inward, thereby changing the contact angle between the cutting edge in the transverse punching head 12 and the punching position, making it greater than 90°, avoiding perpendicular punching of the material at the punching position by the cutting edge, thereby improving the punching quality and increasing the service life of the transverse punching head 12; and the V-shaped stamping block 6 has several waste grooves 10 inside, which facilitates the collection of punching waste.

[0058] In one embodiment, the V-shaped stamping block 6 is provided with a fixed cavity 15, and a push plate is fixedly connected to the second piston rod 13 and slidably connected to the fixed cavity 15. The fixed cavity 15 is provided with a limiting platform, and the push plate slides between the limiting platform and the end wall of the fixed cavity 15 away from the second cylinder 9. The push plate and the end wall of the fixed cavity 15 near the second cylinder 9 are connected by a tension spring 17. When the round hole on the side plate is punched, the stamping head 4 moves upward, and the tension spring 17 resets, thereby pulling the transverse punching head 12 away from the blank and realizing reset. Compared with the traditional hydraulic system, this embodiment can realize punching and reset without the need for the entire closed-loop oil circuit, which greatly reduces the cost while simplifying the structure. The side of the piston head in the second piston rod 13 away from the hydraulic oil can be connected to the hydraulic oil tank through a hose to facilitate the lubrication inside the second cylinder 9. Alternatively, nitrogen can be directly filled into this side for sealing, as long as the compression margin of nitrogen is guaranteed. A pressure relief valve is provided on the oil outlet pipe connecting the first cylinder 8 and the second cylinder 9 to improve safety.

[0059] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "upper," "lower," "left," "right," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hinge processing method, characterized in that, Includes the following steps: S0: Billet pretreatment; Cut the original metal sheet into blanks according to the unfolded dimensions of the hinge arm; remove oil and oxide layers from the surface of the blanks; S1: Countersunk hole stamping; The pre-treated blank is positioned into a special countersunk die and stamped to form the required countersunk hole; S2: Several processing steps are performed within the combined mold; The qualified blanks in S1 are transferred to the integrated combination mold, and the following processes are completed: S2.1: Flanging and shaping; by combining the flanging die and punch in the mold, the two sides of the blank are folded and shaped to achieve the bending of the two side plates of the blank. S2.2: Head shaping; Based on the blank reference after flanging, the end of the blank is pressed and shaped by the head shaping module; S2.3: Top punching; A through hole is punched at a preset position on the head of the blank by using the top punch in the combined mold; S2.4: Side punching; Based on the position reference of the top through hole, several round holes are punched at preset positions on the side of the blank through the side punching module; S3: Pressure holding, deburring, and final inspection of finished products; In S2, the blank is flanging, head shaping, top punching, and side punching are achieved in one stamping stroke of the combined mold continuous processing.

2. The hinge processing method according to claim 1, characterized in that: The combined mold includes a fixed lower mold and a movable upper mold. The lower mold is provided with a positioning groove that mates with the countersunk hole, and the movable upper mold is provided with an elastic pressing block for elastically pressing the non-processed area of ​​the blank.

3. The hinge processing method according to claim 2, characterized in that: The movable upper die includes a punch head and a V-shaped punch block that is elastically connected to the punch head and used to bend the two side plates of the blank. The elastic pressure block is elastically connected inside the V-shaped punch block. After the elastic pressure block elastically presses the non-processed area in the blank, the V-shaped punch block presses down and bends the two side plates of the blank.

4. The hinge processing method according to claim 3, characterized in that: The V-shaped stamping block has a head shaping module inside; a support plate is elastically connected to the fixed lower die aligned with the end of the blank to be shaped. The support plate is stationary during step S2.1, and the top of the support plate is always in contact with the bottom of the blank during step S2.

2. In step S2.2, the support plate moves with the head shaping module. When the head shaping module moves to the end of its stroke, the support plate is embedded in the fixed lower die, and the top of the support plate smoothly transitions with the top of the fixed lower die.

5. The hinge processing method according to claim 3, characterized in that: A vertical rod is fixed to the stamping head, which passes through the top of the V-shaped stamping block. A vertical cutting head for punching holes in the top of the blank is fixed to the vertical rod inside the V-shaped stamping block. In steps S2.1 and S2.2, there is a gap between the vertical cutting head and the blank. When step S2.2 is completed, as the stamping head continues to move downward, the vertical cutting head punches holes in the top of the blank.

6. The hinge processing method according to claim 3, characterized in that: A first cylinder is fixedly connected to each side of the V-shaped stamping block. The first cylinder is filled with hydraulic oil and has a first piston rod inside. The first piston rod is slidably connected to the stamping head and has a push plate on it. When step S2.3 ends, the stamping head abuts against the push plate. The bottom of the first cylinder is connected to an oil outlet pipe. Several oil outlet pipes are connected to several second cylinders fixed to both sides of the V-shaped stamping block. The end of the second piston rod in the second cylinder is provided with a transverse punching head for punching holes in the blank side plate.

7. The hinge processing method according to claim 6, characterized in that: The second piston rod is internally slidably connected to a push rod. The second piston rod is internally provided with a sliding cavity. The end of the push rod is provided with a movable plate that is slidably connected to the sliding cavity. A spring is provided between the movable plate and the end of the sliding cavity. The end of the push rod is a hemispherical head. When not punching, the hemispherical head extends out of the second piston rod under the action of the spring.

8. The hinge processing method according to claim 7, characterized in that: The V-shaped stamping block is provided with a fixed cavity, and a push plate is fixedly connected to the second piston rod and slidably connected to the fixed cavity. The fixed cavity is provided with a limiting platform, and the push plate slides between the limiting platform and the end wall of the fixed cavity away from the second cylinder body. The push plate and the end wall of the fixed cavity near the second cylinder body are connected by a tension spring.

9. The hinge processing method according to claim 1, characterized in that: The V-shaped stamping block has several waste grooves inside.

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