Bending mechanism and bending method

Abstract

The invention discloses a bending mechanism and a bending method.The bending mechanism comprises a fixing base, a first bending base, a second bending base, a bending cover plate and a bending pressing pen, and an adsorption mechanism further comprises a first driving mechanism and an adsorption head and is used for fixing a product and cooperating with the first bending base and the second bending base to complete first bending of the product; the bending cover plate further comprises a first cover plate body, a second cover plate body and a third cover plate body, the first cover plate body is matched with the second cover plate body to complete second bending, the second cover plate body is matched with the bending pressing pen to achieve third bending, finally fourth bending is achieved through the third cover plate body and the bending pressing pen, and product bending is achieved through hardware limiting of the mechanism. The precision and uniformity of product bending are greatly improved, convenience is provided for follow-up product assembling, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bending, and particularly to a bending mechanism and a bending method. Background Art

[0002] Generally, an FPC flexible board is provided inside an electronic product. In its original state, the FPC flexible board is in a flat state and needs to be pre-bent. Due to the complex internal structure of the electronic product, sometimes the FPC flexible board requires multiple bends to match the internal structure of the product. Achieving multiple bends often results in damage to the FPC because manual operation cannot accurately control the force, and at the same time, the position and angle during bending cannot be accurately controlled, nor can the uniformity of bending be ensured, leading to uneven product quality and low production efficiency. Summary of the Invention

[0003] The present application discloses a bending mechanism for multiple bends of a product, including a working platform, comprising:

[0004] A bending module, which is arranged on the working platform and is used to achieve the first bend of the product;

[0005] A bending cover plate, which is used to achieve the second bend of the product; and

[0006] A bending pressing pen, which is used to achieve the third and fourth bends of the product.

[0007] Preferably, the bending module includes a first bending seat and a second bending seat; wherein

[0008] The first bending seat includes a first bending seat pressing head, and a groove is provided at the top of the first bending seat pressing head;

[0009] The second bending seat includes a second bending seat pressing head, and the top of the second bending seat pressing head is provided with a cut surface, and the apex angle formed by the cut surface can match the groove provided at the top of the first bending seat pressing head;

[0010] Preferably, the bending cover plate includes a first cover plate, a second cover plate and a third cover plate; wherein

[0011] The first cover plate includes a first cover plate pressing head and a first cover plate fixing plate, and the top of the first cover plate pressing head is a cut surface;

[0012] The second cover plate includes a second cover plate pressing head and a second cover plate fixing plate, the second cover plate pressing head is telescopically arranged on the second cover plate fixing plate, and the second cover plate pressing head is of a stepped structure, the connecting surface between the two steps is an inclined surface, and the second cover plate pressing head can extend to abut against the cut surface at the top of the first cover plate pressing head;

[0013] The third cover plate includes a third cover plate press head and a third cover plate fixing plate. The third cover plate press head is telescopically arranged on the third cover plate fixing plate, and the top of the third cover plate press head is in a hook shape, and the third cover plate press head can extend to abut against the tangent plane at the top of the first cover plate press head.

[0014] Preferably, the bending pen includes:

[0015] A main body;

[0016] A first bending pen press head, which is arranged on the main body and is obliquely bent at a certain angle with respect to the main body. The first bending pen press head can cooperate with the second cover plate to realize the third bending of the product;

[0017] A second bending pen press head, which is arranged at the other end of the main body and has a groove at the top of the second bending pen press head. The second bending pen press head can cooperate with the third cover plate to realize the fourth bending of the product.

[0018] Preferably, the bending mechanism further includes:

[0019] A fixed seat, which further includes an upper bottom plate and a lower bottom plate, and the upper bottom plate is slidably connected to the lower bottom plate;

[0020] Preferably, the fixed seat includes:

[0021] A carrier, which is arranged on the upper bottom plate and is used for carrying the container of the product.

[0022] Preferably, the fixed seat further includes a clamping mechanism, which is arranged on both sides of the upper bottom plate and is used for clamping and positioning the carrier.

[0023] Preferably, the fixed seat further includes a stop block mechanism, which is arranged on both sides of the upper bottom plate.

[0024] Preferably, the fixed seat further includes an adsorption mechanism, which includes a driving mechanism and a suction head. The suction head is arranged at the driving end of the driving mechanism. The top of the suction head has a groove and a negative pressure suction hole is arranged therein. A part of the product can be arranged in the groove at the top of the suction head.

[0025] Preferably, using the bending mechanism as described above to bend the product includes the following steps:

[0026] S1: Realize the feeding and fixing of the carrier through the clamping mechanism and the stop block mechanism. Clamp one end of the product in the container carrying the product, and the suction head adsorbs the product and adsorbs the product in the sunken groove at the top of the suction head. At this time, the product is in a flattened state;

[0027] S2: The flat side close to the suction head is attached to the surface of the suction head, and the product is clamped in the groove at the top of the suction head. At this time, the top of the second bending seat pressure head is the chamfer formed by the cut surface, and the edge of the chamfer is at the first bending line;

[0028] S3: The first bending seat pressure head approaches the top of the second bending seat pressure head. At this time, the top of the second bending seat pressure head is inserted into the groove of the first bending seat pressure head through the product. The product located outside the second bending seat pressure head is bent and attached to the cut surface of the second bending seat pressure head. The first bending is completed, and the first bending seat pressure head and the second bending seat pressure head are retracted;

[0029] S4: placing the first cover plate on the carrier, at which point the flat side of the first cover plate pressing head is in close contact with the fixed end of the product, and the top of the first cover plate pressing head is a chamfer formed by the cut surface, and the chamfer edge is located at the second bending line;

[0030] S5: Place the second cover plate on the carrier, stretch the second cover plate pressing head and push the product to bend along the second bending line until it is close to the cut surface of the top of the first cover plate pressing head. At the same time, the plane height of the second cover plate pressing head close to the product is located at the third bending line, and the second bending is completed at this time;

[0031] S6: The first bending pen press head 61 of the bending press pen 6 is attached and pushed toward the second cover plate press head 522 along the third bending line. At this time, the third bending is preliminarily completed. The product is bent along the third bending line until it abuts against the connecting surface between the two steps of the second cover plate press head 522 across the product. At this time, the third bending is completed, and the second cover plate press head 522 is retracted and taken out.

[0032] S7: Place the third cover plate 53 on the position of the original second cover plate 52, and stretch the third cover plate pressure head 532 until the product is close to the cross-section of the top of the first cover plate pressure head 512. At this time, the third cover plate pressure head 532 is at the third bending line and slightly higher than the first cover plate pressure head 512. Then move the second bending pen pressure head of the bending pressure pen close to the product, and press the product down along the third bending line until the third cover plate pressure head 532 abuts against the groove of the second bending pen pressure head. At this time, the third bend is completed.

[0033] S8: manually remove the first cover plate and the third cover plate and unlock the clamping mechanism and the stopper mechanism, remove the product, complete the multi-pass bending of the product, and repeat the above operation.

[0034] Beneficial effects:

[0035] Compared with the prior art, the bending mechanism provided by the present application realizes multi-stage bending of products through a bending base, a bending cover plate and a bending pressing pen, and realizes the bending of products through the hardware limit of the mechanism, greatly improving the accuracy and uniformity of product bending, facilitating the subsequent assembly of products and improving production efficiency.

[0036] The bending method provided by the present application realizes the accuracy and uniformity of products during bending, and at the same time avoids interference caused by sequence or shape during bending, greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 Shows a schematic structural diagram of a bending mechanism;

[0039] Figure 2 Shows a schematic structural diagram of a fixing seat;

[0040] Figure 3 Shows a schematic structural diagram of a carrier placed on the fixing seat;

[0041] Figure 4 Shows a schematic structural diagram of a product placed on the carrier;

[0042] Figure 5 Shows a schematic structural diagram of a first bending base;

[0043] Figure 6 Shows a schematic structural diagram of a second bending base;

[0044] Figure 7 Shows a schematic structural diagram of a bending cover plate;

[0045] Figure 8 Shows a schematic structural diagram of a bending pressing pen.

[0046] REFERENCE MARKS:

[0047] A, state and structure of the product before bending;

[0048] a, first bending line; b, second bending line; c, third bending line;

[0049] 1, working platform;

[0050] 2. Fixed base; 21. Lower base plate; 22. Upper base plate; 23. First driving mechanism; 24. Second driving mechanism; 25. Suction head; 26. Clamping mechanism; 27. Stopper mechanism; 28. Carrier;

[0051] 3. First bending seat; 31. First column; 32. First bending seat press head;

[0052] 4. Second bending seat; 41. Second column; 42. First bending seat press head;

[0053] 5. Bending cover plate; 51. First cover plate; 511. First cover plate fixing plate; 512. First cover plate press head; 52. Second cover plate; 521. Second cover plate fixing plate; 522. Second cover plate press head; 53. Third cover plate; 531. Third cover plate fixing plate; 532. Third cover plate press head;

[0054] 6. Bending pen; 61. First bending pen press head; 62. Second bending pen press head. Detailed implementation mode

[0055] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0056] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0058] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0059] Generally, an FPC flexible board is provided inside an electronic product. The FPC flexible board is in a flat state in its original state and needs to be pre-bent. Due to the complex internal structure of the electronic product, sometimes the FPC flexible board needs multiple bends to match the internal structure of the product. Implementing multiple bends often causes damage to the FPC because manual operation cannot accurately control the force, and at the same time, the position and angle during bending cannot be accurately controlled, nor can the uniformity of bending be ensured, resulting in uneven product quality and low production efficiency.

[0060] To solve the above problems, as Figure 1 shown, this embodiment provides a bending mechanism, which mainly includes a working platform 1, a fixed seat 2, a bending module, a bending cover plate 5, and a bending pen 6. Among them, the bending module includes a first bending seat 3 and a second bending seat 4. Specifically, the fixed seat 2 is slidably connected to the working platform 1, and the fixed seat 2 can slide back and forth on the working platform 1. The first bending seat 3 and the second bending seat 4 are arranged on both sides of the fixed seat 2 and are respectively located at one end of the movement track of the fixed seat 2. The bending pen 6 is clamped on the working platform 1. Here, it should be noted that the end of the movement track of the fixed seat 2 away from the first bending seat 3 and the second bending seat 4 is the loading position. On the contrary, the end of the movement track of the fixed seat 2 close to the first bending seat 3 and the second bending seat 4 is the working position.

[0061] As Figure 2 and Figure 3As shown in the figure, the fixing base 2 includes a lower base plate 21 and an upper base plate 22. A first driving mechanism 23 is provided between the lower base plate 21 and the upper base plate 22. The fixed end of the first driving mechanism 23 is arranged on the lower base plate 21, and the driving end of the first driving mechanism 23 is connected to the upper base plate 22. The second driving mechanism 24 is arranged on the lower base plate 21. The fixing base 2 further includes an adsorption mechanism. The adsorption mechanism includes the second driving mechanism 24 and a suction head 25. The suction head 25 is connected to the driving end of the second driving mechanism 24. It should be noted that a part of the top of the suction head 25 sinks, and negative pressure suction holes are provided on the sunken part, and the sinking depth is the thickness of the product (when the product is adsorbed on the suction head and placed on the sunken part at the top of the suction head 25, the top of the suction head 25 can be made into a flat surface). The fixing base 2 further includes a clamping mechanism 26, a stop block mechanism 27 and a carrier 28. Specifically, positioning pins are provided on the upper base plate 22, and the carrier 28 can be fixed to the upper base plate 22. The clamping mechanism 26 and the stop block mechanism 27 are respectively arranged in pairs on both sides of the carrier 28. The stop block mechanism 27 includes a stop block base and a cover plate. The cover plate is flip - mounted on the stop block base, and some wire harnesses on the carrier can be constrained by pressing the cover plate to avoid interference during the assembly process. The clamping mechanism 26 includes a driving mechanism and a top block. The top block is arranged at the driving end of the driving mechanism. The clamping mechanism 26 is arranged on both sides of the carrier 28 and moves relatively to clamp and fix the carrier 28. It should be noted that all the driving mechanisms here are cylinders.

[0062] As Figure 4 shown, the product is clamped in the housing within the carrier 28, where there are respectively a first bending line, a second bending line and a third bending line along a, b, c.

[0063] As Figure 5 shown, the first bending seat 3 includes a first column 31 and a first bending seat press head 32. Specifically, the first bending column 31 is arranged on the working platform 1, and the first bending seat press head 32 is connected to the first bending column 31 through a driving mechanism. The driving mechanism can drive the first bending seat press head 32 to move in the vertical and horizontal directions respectively. A groove is provided at the top of the first bending seat press head 32. It should be noted that all the driving mechanisms here are cylinders.

[0064] As Figure 6 shown, the second bending seat 4 includes a second column 41 and a second bending seat press head 42. Specifically, the second bending column 41 is arranged on the working platform 1, and the second bending seat press head 42 is connected to the second bending column 41 through a driving mechanism. The driving mechanism can drive the second bending seat press head 42 to move in the vertical and horizontal directions respectively. The top of the second bending seat press head 42 is set as a cutting surface, and the vertex angle formed by the cutting surface can match the groove provided at the top of the first bending seat press head 3. It should be noted that all the driving mechanisms here are cylinders.

[0065] As Figure 7As shown, the bending cover plate 5 includes a first cover plate 51, a second cover plate 52 and a third cover plate 53. Specifically, the first cover plate 51 includes a first cover plate fixing plate 511 and a first cover plate pressing head 512. The top of the first cover plate pressing head 512 is a cut surface setting. The first cover plate pressing head 512 is connected to one side of the first cover plate fixing plate 511. The first cover plate fixing plate 511 can be clamped on the cover plate material tray 54. The second cover plate 52 includes a second cover plate fixing plate 521 and a second cover plate pressing head 522. The second cover plate pressing head 522 can be telescopically connected to the second cover plate fixing plate 521. The top of the second cover plate pressure head 522 is a rotatable structure and is stepped, and a certain guide angle (the guide angle of the fourth bend) is formed between the two steps. The third cover plate 53 includes a third cover plate fixing plate 531 and a third cover plate pressure head 532. The third cover plate pressure head 532 is telescopically connected to the third cover plate fixing plate 531. The top of the third cover plate pressure head 532 is hook-shaped and has a relatively thin thickness, which is used to match the second bending pen pressure head 62. The above first cover plate 51, the second cover plate 52 and the third cover plate 53 are all provided with handles for easy picking up, and can all be covered on the carrier 28.

[0066] like Figure 8 As shown, the bending pen pressure head 6 includes a main body, a first bending pen pressure head 61 and a second bending pen pressure head 62. The main body is a cylindrical structure. The first bending pen pressure head 61 is connected to one end of the main body, and is bent at a certain angle to form a chamfer, wherein the chamfer here matches the chamfer formed between the two steps at the top of the second cover plate pressure head 522. The second bending pen pressure head 62 is connected to the other end of the main body, and a groove is provided on the top of the second bending pen pressure head 62 for matching the third cover plate pressure head 532.

[0067] This embodiment also provides a bending method, which uses the above-mentioned bending mechanism to bend a product, including the following steps:

[0068] S1: The carrier 28 is fixed by the clamping mechanism 26 and the stopper mechanism 27, one end of the product is clamped in the container carrying the product, and the suction head 25 absorbs the product and absorbs the product into the groove sunk at the top of the suction head 25. At this time, the product is in a flattened state;

[0069] S2: The flat side close to the suction head 25 is attached to the surface of the suction head 25, and the product is clamped in the groove at the top of the suction head 25. At this time, the top of the second bending seat pressure head 42 is the chamfer formed by the cut surface, and the edge of the chamfer is at the first bending line a;

[0070] S3: The first bending seat press head 32 approaches the top of the second bending seat press head 42. At this time, the top of the second bending seat press head 42 is inserted into the groove of the first bending seat press head 32 through the product. The product located outside the second bending seat press head 42 is bent and attached to the cut surface of the second bending seat press head 42. The first bending is completed, and the first bending seat press head 32 and the second bending seat press head 42 are retracted;

[0071] S4: The first cover plate 51 is placed on the carrier 28. At this time, the flat side of the first cover plate pressing head 512 is close to the fixed end of the product, and the top of the first cover plate pressing head 512 is a chamfer formed by the cut surface, and the chamfer edge is located at the second bending line b;

[0072] S5: Place the second cover plate 52 on the carrier 28, stretch the second cover plate pressing head 522 and push the product along the second bending line b Bend until it is close to the cut surface of the top of the first cover plate pressing head 512. At the same time, the second cover plate pressing head 522 is close to the plane height of the product at the third bending line c. At this time, the second bend is completed;

[0073] S6: The first bending pen pressing head 61 of the bending pressing pen 6 is attached and pushed toward the second cover plate pressing head 522 along the third bending line c. At this time, the third bending is preliminarily completed. The product is bent along the third bending line c until it abuts against the connecting surface between the two steps of the second cover plate pressing head 522 across the product. At this time, the third bending is completed, and the second cover plate pressing head 522 is retracted and taken out;

[0074] S7: Cover the third cover plate 53 on the position of the original second cover plate 52, and stretch the third cover plate pressing head 532 until the product is close to the cross-section of the top of the first cover plate pressing head 512. At this time, the third cover plate pressing head 532 is at the third bending line and slightly higher than the first cover plate pressing head 512. Then, the second bending pen pressing head 62 of the bending pressing pen 6 is brought close to the product, and the product is pressed down along the third bending line c until the third cover plate pressing head 532 abuts against the groove of the second bending pen pressing head 62. At this time, the third bending is completed;

[0075] S8: manually remove the first cover plate 51 and the third cover plate 53 and unlock the clamping mechanism 26 and the stopper mechanism 27, remove the product, complete the multiple bending of the product, and repeat the above operation.

[0076] This mechanism realizes multi-pass bending of the product through a bending seat, a bending cover plate and a bending pressure pen, and realizes the bending of the product through the hardware limit of the mechanism, which greatly improves the accuracy and uniformity of product bending, provides convenience for subsequent product assembly, and improves production efficiency.

[0077] The above is only a preferred implementation of a bending mechanism and a bending method disclosed in the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A bending mechanism for multi-stage bending of a product, including a working platform, characterized in that, further comprising: a bending module, which is arranged on the working platform and is used to realize the first-stage bending of the product; a bending cover plate, which is used to realize the second-stage bending of the product; and a bending pressing pen, which is used to realize the third-stage and fourth-stage bending of the product.

2. The bending mechanism according to claim 1, wherein, The bending module includes a first bending seat and a second bending seat; wherein the first bending seat includes a first bending seat pressing head, and a groove is provided at the top of the first bending seat pressing head; the second bending seat includes a second bending seat pressing head, the top of the second bending seat pressing head is provided with a cut surface, and the apex angle formed by the cut surface can be matched with the groove provided at the top of the first bending seat pressing head.

3. The bending mechanism according to claim 2, wherein, The bending cover plate includes a first cover plate, a second cover plate and a third cover plate; wherein the first cover plate includes a first cover plate pressing head and a first cover plate fixing plate, and the top of the first cover plate pressing head is a cut surface; the second cover plate includes a second cover plate pressing head and a second cover plate fixing plate, the second cover plate pressing head is telescopically arranged on the second cover plate fixing plate, and the second cover plate pressing head is of a stepped structure, the connecting surface between the two steps is an inclined surface, and the second cover plate pressing head can extend and abut against the cut surface at the top of the first cover plate pressing head; the third cover plate includes a third cover plate pressing head and a third cover plate fixing plate, the third cover plate pressing head is telescopically arranged on the third cover plate fixing plate, the top of the third cover plate pressing head is in a hook shape, and the third cover plate pressing head can extend and abut against the cut surface at the top of the first cover plate pressing head.

4. The bending mechanism according to claim 3, characterized in that, The bending pressing pen includes: a main body; a first bending pen pressing head, which is arranged on the main body and is obliquely bent at a certain angle relative to the main body, and the first bending pen pressing head can cooperate with the second cover plate to realize the third-stage bending of the product; a second bending pen pressing head, which is arranged at the other end of the main body and a groove is provided at the top of the second bending pen pressing head, and the second bending pen pressing head can cooperate with the third cover plate to realize the fourth-stage bending of the product.

5. A bending mechanism according to claim 4, characterized in that, The bending mechanism further includes a fixing seat, the fixing seat includes an upper bottom plate and a lower bottom plate, and the upper bottom plate is slidably connected to the lower bottom plate.

6. The bending mechanism according to claim 5, characterized in that, The fixing seat further includes a carrier, and the carrier is arranged on the upper bottom plate and is used for carrying the container of the product.

7. A bending mechanism according to claim 6, characterized in that, The fixing seat further includes a clamping mechanism, and the clamping mechanism is arranged on both sides of the upper bottom plate and is used for clamping and positioning the carrier.

8. A bending mechanism according to claim 7, wherein, The fixing seat further includes a stop block mechanism, and the stop block mechanism is arranged on both sides of the upper bottom plate.

9. The bending mechanism according to claim 8, characterized in that, The fixing seat further includes an adsorption mechanism, the adsorption mechanism includes a driving mechanism and a suction head, the suction head is arranged at the driving end of the driving mechanism, a groove is provided at the top of the suction head and a negative pressure suction hole is arranged inside the suction head, and a part of the product can be arranged in the groove at the top of the suction head.

10. A bending method, which realizes the bending steps through the bending mechanism described in claim 8, is characterized in that, including the following steps: S1: Realize the feeding and fixing of the carrier through the clamping mechanism and the stop block mechanism, clamp one end of the product in the container carrying the product, the suction head adsorbs the product, and adsorb the product in the sunken groove at the top of the suction head. At this time, the product is in a flattened state; S2: The second bending seat pressure head is close to the suction head and the flat side is attached to the surface of the suction head, and the product is clamped in the groove at the top of the suction head. At this time, the top of the second bending seat pressure head is the chamfer formed by the cut surface, and the edge of the chamfer is at the first bending line; S3: The first bending seat pressure head approaches the top of the second bending seat pressure head. At this time, the top of the second bending seat pressure head is inserted into the groove of the first bending seat pressure head through the product. The product located outside the second bending seat pressure head is bent and attached to the cut surface of the second bending seat pressure head. The first bending is completed, and the first bending seat pressure head and the second bending seat pressure head are retracted; S4: placing the first cover plate on the carrier, at which point the flat side of the first cover plate pressing head is in close contact with the fixed end of the product, and the top of the first cover plate pressing head is a chamfer formed by the cut surface, and the chamfer edge is located at the second bending line; S5: Place the second cover plate on the carrier, stretch the second cover plate pressing head and push the product to bend along the second bending line until it is close to the cut surface of the top of the first cover plate pressing head. At the same time, the plane height of the second cover plate pressing head close to the product is located at the third bending line, and the second bending is completed at this time; S6: The first bending pen pressing head 61 of the bending pressing pen 6 is attached and pushed toward the second cover plate pressing head 522 along the third bending line. At this time, the third bending is preliminarily completed. The product is bent along the third bending line until it abuts against the connecting surface between the two steps of the second cover plate pressing head 522 across the product. At this time, the third bending is completed, and the second cover plate pressing head 522 is retracted and taken out; S7: Cover the third cover plate 53 on the original position of the second cover plate 52, and stretch the third cover plate pressing head 532 until the product is close to the cross-section of the top of the first cover plate pressing head 512. At this time, the third cover plate pressing head 532 is at the third bending line and slightly higher than the first cover plate pressing head 512. Then, bring the second bending pen pressing head of the bending pressing pen close to the product, and press the product down along the third bending line until the third cover plate pressing head 532 abuts against the groove of the second bending pen pressing head. At this time, the third bending is completed; S8: manually remove the first cover plate and the third cover plate and unlock the clamping mechanism and the stopper mechanism, remove the product, complete the multi-pass bending of the product, and repeat the above operation.

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