A bending mold and bending method for a stair step

Abstract

The application discloses a bending die for stair steps, which comprises at least one set of upper die assembly and lower die assembly arranged oppositely; the upper die assembly comprises an upper die with a V-shaped stamping head and a plurality of upper die pieces fixed on both sides of the upper die and staggered along the extension of the two inclined surfaces of the V-shaped stamping head; the lower die assembly comprises a lower die with a V-shaped stamping groove and a plurality of lower die pieces fixed on both sides of the lower die and staggered along the extension of the two inclined surfaces of the V-shaped stamping groove; the V-shaped stamping head is matched with the V-shaped stamping groove. After a first V-shaped groove is bent along a first bending line of a blank plate, a second V-shaped groove is bent along a second bending line of the blank plate, and the first bending line and the second bending line are arranged alternately, so that the stair steps with ideal width and ideal height can be obtained, and the work load is reduced and the processing efficiency is improved without turning over and welding. The application further discloses a bending method for stair steps.

Description

Technical Field

[0001] This invention relates to the field of stair tread processing technology, and particularly to a bending mold for stair treads. This invention also relates to a method for bending stair treads. Background Technology

[0002] Stair treads are mostly made of steel plates, which are relatively economical and durable, and can be used in staircases of multi-story and high-rise buildings, work platforms, railway bridge walkways, high-altitude tower platforms, etc. Currently, stair treads are generally bent into one or two steps during manufacturing. When bending into two steps, the steel plate must be flipped over to form two steps. After the steps are bent, they are welded together to form a whole.

[0003] However, the existing processing of stair treads requires flipping steel plates and welding each tread individually, which is a complicated and inconvenient process that seriously affects processing efficiency. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a bending mold for stair treads, which bends the blank plate along alternating primary and secondary bending lines, eliminating the need for flipping and welding the blank plate, reducing workload, simplifying processing, and improving processing efficiency. Another purpose of this invention is to provide a bending method for stair treads.

[0005] The stair tread bending die provided by the present invention includes at least one set of upper die assembly and lower die assembly arranged opposite to each other; after bending a first V-groove along the first bending line of the blank plate, any set of upper die assembly and lower die assembly bends a second V-groove along the second bending line of the blank plate, with the first bending line and the second bending line alternately arranged; the upper die assembly includes an upper die with a V-shaped punch head and several upper die pieces fixed on both sides of the upper die and staggered along the two inclined surfaces of the V-shaped punch head to extend the length of the two sides of the V-shaped punch head; the lower die assembly includes a lower die with a V-shaped punch groove and several lower die pieces fixed on both sides of the lower die and staggered along the two inclined surfaces of the V-shaped punch groove to extend the length of the two sides of the V-shaped punch groove; the V-shaped punch head and the V-shaped punch groove cooperate.

[0006] Preferably, the upper mold assembly further includes two upper clamping plates that are detachably fixed to the left and right sides of the upper mold, and a preset number of upper mold pieces are provided between each upper clamping plate and the upper mold; the lower mold assembly further includes two lower clamping plates that are detachably fixed to the left and right sides of the lower mold, and a preset number of lower mold pieces are provided between each lower clamping plate and the lower mold; the two upper clamping plates and the two lower clamping plates correspond to each other and abut against each other.

[0007] Preferably, when bending along a single bend line, the opposing surfaces of the upper and lower clamping plates are both horizontal.

[0008] Preferably, when bending along the double bend line, the opposing surfaces of the upper and lower clamping plates are both wedge-shaped surfaces.

[0009] Preferably, the two upper clamping plates, all upper mold pieces, and the upper mold are bolted together, and the two lower clamping plates, all lower mold pieces, and the lower mold are bolted together.

[0010] Preferably, both the upper and lower molds are provided with several through waist-shaped holes.

[0011] Preferably, it also includes a connecting support that is fixedly connected to the upper die assembly and used for connecting the stamping equipment.

[0012] Preferably, the upper panel of the connecting support is provided with a snap-fit ​​groove for connecting to the stamping equipment.

[0013] The stair tread bending method provided by this invention, applied to the bending mold of any of the above-mentioned stair treads, includes the following steps:

[0014] Adjust the number of upper mold pieces in the upper mold assembly and the number of lower mold pieces in the lower mold assembly;

[0015] The first V-groove is formed by bending the upper and lower die assemblies along the first bending line of the blank plate.

[0016] Readjust the number of upper mold pieces in the upper mold assembly and the number of lower mold pieces in the lower mold assembly;

[0017] The upper and lower die components, which are set up relative to each other, are used to bend the blank plate along the secondary bending line to form the second V-groove. The primary bending line and the secondary bending line are set alternately.

[0018] Preferably, the steps further include:

[0019] Remove the upper mold piece from the upper mold assembly and the lower mold piece from the lower mold assembly;

[0020] The second V-groove is created by bending the upper and lower mold components along the last secondary bending line.

[0021] Compared to the prior art, the stair tread bending mold provided by the present invention includes at least one set of opposing upper mold assembly and lower mold assembly. The upper mold assembly includes an upper mold and several upper mold pieces. The upper mold has a V-shaped stamping head. All the upper mold pieces are fixed to both sides of the upper mold and staggered along the two inclined extension surfaces of the V-shaped stamping head to extend the length of the two sides of the V-shaped stamping head. The lower mold assembly includes a lower mold and several lower mold pieces. The lower mold has a V-shaped stamping groove. All the lower mold pieces are fixed to both sides of the lower mold and staggered along the two inclined extension surfaces of the V-shaped stamping groove to extend the length of the two sides of the V-shaped stamping groove.

[0022] During processing, first adjust the number of upper and lower die pieces, then place any set of upper and lower die components on both sides of the blank plate. The V-shaped punch head and V-shaped punch groove cooperate to bend the first V-shaped groove along the first bending line of the blank plate, thus obtaining the first V-shaped groove of the ideal size. Then, adjust the number of upper and lower die pieces, and bend the second V-shaped groove along the second bending line of the blank plate, thus obtaining the second V-shaped groove of the ideal size. The first bending line and the second bending line on the blank plate are set alternately, thus obtaining the stair treads with the ideal width and ideal height.

[0023] As can be seen from the above, when bending the blank plate, the present invention does not require flipping the blank plate or welding the blank plate, which significantly reduces the workload, makes processing more convenient, and helps to improve processing efficiency.

[0024] The method for bending stair treads provided by this invention has the same beneficial effects. Attached Figure Description

[0025] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a structural diagram of the first upper mold assembly and the first lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention.

[0027] Figure 2 for Figure 1 Structural diagram of the upper mold of the upper mold assembly, the lower mold of the lower mold assembly, and the connecting support 4;

[0028] Figure 3 This is a structural diagram of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention.

[0029] Figure 4 for Figure 1 Structural diagram of the central connecting support;

[0030] Figure 5 for Figure 4 Exploded view;

[0031] Figure 6 This is a diagram showing the state of the first upper mold assembly and the first lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention, where the blank plate is clamped.

[0032] Figure 7 for Figure 6 A partial cross-sectional structural diagram;

[0033] Figure 8 The diagram shows the state of the first upper mold assembly and the first lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention bending the blank plate along the first bending line of the blank plate.

[0034] Figure 9 The diagram shows the state of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention bending the blank plate along the secondary bending line of the blank plate.

[0035] Figure 10 The diagram shows the state of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the first specific embodiment of the present invention bending the blank plate along the last secondary bending line of the blank plate;

[0036] Figure 11 This is a structural diagram of the stair treads bent by the stair tread bending mold provided in the first specific embodiment of the present invention;

[0037] Figure 12 This is a structural diagram of the first upper mold assembly and the first lower mold assembly of the stair tread bending mold provided in the second specific embodiment of the present invention;

[0038] Figure 13 A structural diagram of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the second specific embodiment of the present invention;

[0039] Figure 14 This is a diagram showing the state of the first upper mold assembly and the first lower mold assembly clamping the blank plate in the bending mold of the stair treads provided in the second specific embodiment of the present invention.

[0040] Figure 15 The diagram shows the state of the first upper mold assembly and the first lower mold assembly of the stair tread bending mold provided in the second specific embodiment of the present invention bending the blank plate along the first bending line of the blank plate;

[0041] Figure 16 A diagram showing the state of the second upper mold assembly and the second lower mold assembly clamping the blank plate in the stair tread bending mold provided in the second specific embodiment of the present invention;

[0042] Figure 17 A diagram showing the state of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the second specific embodiment of the present invention bending the blank plate along the secondary bending line of the blank plate;

[0043] Figure 18The diagram shows the state of the second upper mold assembly and the second lower mold assembly of the stair tread bending mold provided in the second specific embodiment of the present invention bending the blank plate along the last secondary bending line of the blank plate.

[0044] The attached figures are labeled as follows:

[0045] Upper mold assembly 1, lower mold assembly 2, blank plate 3, and connecting support 4;

[0046] V-shaped stamping head 10, first upper die assembly 11 and second upper die assembly 12;

[0047] V-shaped stamping groove 20, first lower die assembly 21 and second lower die assembly 22;

[0048] First upper mold 111, first upper mold piece 112 and first upper clamping plate 113;

[0049] Second upper mold 121, second upper mold piece 122, and second upper clamping plate 123;

[0050] The first lower mold 211, the first lower mold piece 212, and the first lower clamping plate 213;

[0051] Second lower mold 22, second lower mold piece 222, and second lower clamping plate 223;

[0052] First bend line 31, first V-groove 32, second bend line 33, and second V-groove 34;

[0053] Card slot 41. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] This invention discloses a bending mold for stair treads, such as... Figures 1 to 5As shown, the assembly includes at least one set of upper mold assembly 1 and lower mold assembly 2 arranged opposite to each other for bending the blank plate 3. Before bending, the blank plate 3 is a thin plate. The blank plate 3 has a primary bending line 31 and a secondary bending line 33, which are alternately arranged. The spacing between the primary bending line 31 and the secondary bending line 33 can be adaptively adjusted according to the height and width of the stair treads, and is not specifically limited here.

[0057] The upper die assembly 1 includes an upper die and several upper die pieces. The upper die is elongated and has a V-shaped stamping head 10 on its bottom side. The two inclined surfaces of the V-shaped stamping head 10 preferably intersect perpendicularly, and the lengths of the two inclined surfaces are unequal. The length of one inclined surface is determined by the height of the stair tread, and the length of the other inclined surface is determined by the width of the stair tread. All the upper die pieces are fixed to both sides of the upper die, and the bottom sides of all the upper die pieces are staggered along the extended surfaces of the two inclined surfaces of the V-shaped stamping head 10 to extend the length of the two sides of the V-shaped stamping head 10.

[0058] The lower die assembly 2 includes a lower die and several lower die pieces. The top side of the lower die has a V-shaped stamping groove 20. The V-shaped stamping groove 20 is opposite to the V-shaped stamping head 10. When the V-shaped stamping head 10 stamps the blank plate 3, the blank plate 3 is bent under the combined action of the V-shaped stamping groove 20 and the V-shaped stamping head 10. All the lower die pieces are fixed on both sides of the lower die, and the top sides of all the lower die pieces are staggered along the two inclined extension surfaces of the V-shaped stamping groove 20 to extend the length of the two sides of the V-shaped stamping groove 20, so that the upper die assembly 1 and the lower die assembly 2 cooperate to bend the blank plate 3 into a stair tread with an ideal height and ideal width.

[0059] During processing, first adjust the number of upper and lower die pieces, then place any set of upper die assembly 1 and lower die assembly 2 on both sides of the blank plate 3. The V-shaped punch head 10 cooperates with the V-shaped punch groove 20 to bend the first V-shaped groove 32 along the first bending line 31 of the blank plate 3, thus obtaining the first V-shaped groove 32 of the ideal size. Then, adjust the number of upper and lower die pieces, and bend the second V-shaped groove 34 along the second bending line 33 of the blank plate 3, thus obtaining the second V-shaped groove 34 of the ideal size. The first bending line 31 and the second bending line 33 on the blank plate 3 are alternately set, thus obtaining the stair treads with the ideal width and ideal height.

[0060] In summary, when bending the blank plate 3, the present invention eliminates the need to flip the blank plate 3 or to weld the blank plate 3, significantly reducing the workload, making processing more convenient, and improving processing efficiency.

[0061] The upper mold assembly 1 also includes two upper clamping plates, which are located on the left and right sides of the upper mold, respectively. A preset number of upper mold pieces are provided between each upper clamping plate and the upper mold, so that the upper mold pieces are fixed to both sides of the upper mold by the upper clamping plates. The two upper clamping plates, all the upper mold pieces, and the upper mold are detachably connected. Specifically, the two upper clamping plates, all the upper mold pieces, and the upper mold are bolted together, which facilitates the addition or removal of upper mold pieces.

[0062] The lower mold assembly 2 also includes two lower clamping plates, which are located on the left and right sides of the lower mold, respectively. Each lower clamping plate has a preset number of lower mold pieces between it and the lower mold, so that the lower mold pieces are fixed to both sides of the lower mold by the lower clamping plates. The two lower clamping plates, all the lower mold pieces, and the lower mold are detachably connected. Specifically, the two lower clamping plates, all the lower mold pieces, and the lower mold are bolted together, which facilitates the addition or removal of lower mold pieces.

[0063] The two upper clamping plates and the two lower clamping plates correspond to each other and abut against each other to clamp the blank plate 3 during the bending process, prevent the blank plate 3 from moving around when bending, and help improve the bending quality.

[0064] Both the upper and lower molds are provided with several through waist-shaped holes to compensate for machining errors and facilitate assembly.

[0065] In the first specific embodiment, such as Figures 6 to 11 As shown, the upper die assembly 1 includes a first upper die assembly 11, which includes a first upper mold 111, a first upper die piece 112, and a first upper clamping plate 113. Three first upper die pieces 112 are fixed to the left side of the first upper mold 111, and five first upper die pieces 112 are fixed to the right side of the first upper mold 111. The bottom sides of all the first upper die pieces 112 are staggered along the two inclined extension surfaces of the V-shaped stamping head 10 of the first upper mold 111. The lower die assembly 2 includes a first lower die assembly 21, which includes a first lower mold 211, a first lower die piece 212, and a first lower clamping plate 213. Three first lower die pieces 212 are fixed to the left side of the first lower mold 211, and five first lower die pieces 212 are fixed to the right side of the first lower mold 211. The top sides of all the first lower die pieces 212 are staggered along the two inclined extension surfaces of the V-shaped stamping head 10 of the first lower mold 211. The first upper mold assembly 11 is opposite to the first lower mold assembly 21 and is used to bend the first V-groove 32 along the first bending line 31 of the blank plate 3.

[0066] The opposing surfaces of the upper and lower clamping plates are both horizontal. Specifically, the opposing surfaces of the first upper clamping plate 113 and the first lower clamping plate 213 are both horizontal, which is used to flatten the first V-groove 32 and avoid affecting the bending quality of the second V-groove 34.

[0067] In a first specific embodiment, the upper die assembly 1 further includes a second upper die assembly 12, which includes a second upper die 121, a second upper die piece 122, and a second upper clamping plate 123. Three second upper die pieces 122 are fixed to the left side of the second upper die 121, and four second upper die pieces 122 are fixed to the right side of the second upper die 121. The bottom sides of all the second upper die pieces 122 are staggered along the two inclined extension surfaces of the V-shaped stamping head 10 of the second upper die 121. The lower die assembly 2 includes a second lower die assembly 22, which includes a second lower die 22, a second lower die piece 222, and a second lower clamping plate 223. Three second lower die pieces 222 are fixed to the left side of the second lower die 22, and four second lower die pieces 222 are fixed to the right side of the second lower die 22. The top sides of all the second lower die pieces 222 are staggered along the two inclined extension surfaces of the V-shaped stamping head 10 of the second lower die 22. The second upper mold assembly 12 is opposite to the second lower mold assembly 22 and is used to bend the second V-groove 34 along the secondary bending line 33 of the blank plate 3.

[0068] The opposing surfaces of the upper and lower clamping plates are both wedge-shaped. Specifically, the opposing surfaces of the second upper clamping plate 123 and the second lower clamping plate 223 are both wedge-shaped. The wedge-shaped surface of the second upper clamping plate 123 extends along the two inclined surfaces of the V-shaped punch head 10 of the second upper die 121, and the wedge-shaped surface of the second lower clamping plate 223 extends along the two inclined surfaces of the V-shaped punch head 10 of the second lower die 22. This avoids affecting the first V-shaped groove 32 during the bending of the second V-shaped groove 34.

[0069] It should also be noted that when the distance between the last secondary bending line 33 of the blank plate 3 and the edge of the blank plate 3 is short, before bending the blank plate 3 along the last secondary bending line 33, the upper die piece of the upper die assembly 1 and the lower die piece of the lower die assembly 2 should be completely removed first to avoid the last second V-groove 34 being too wide and affecting the shape of the adjacent V-grooves. Of course, the number of upper die pieces of the upper die assembly 1 and lower die pieces of the lower die assembly 2 removed can be adjusted adaptively according to the distance between the last secondary bending line 33 and the edge of the blank plate 3, and no specific limitation is made here.

[0070] During processing, first adjust the number of upper die pieces in the first upper die assembly 11 and the number of lower die pieces in the first lower die assembly 21. Then, place the first upper die assembly 11 and the first lower die assembly 21 on both sides of the blank plate 3. The V-shaped punch head 10 and the V-shaped punch groove 20 cooperate to bend the first V-shaped groove 32 along the first bending line 31 of the blank plate 3. Then, first adjust the number of upper die pieces in the second upper die assembly 12 and the number of lower die pieces in the second lower die assembly 22. Then, place the second upper die assembly 12 and the second lower die assembly 22 on both sides of the blank plate 3. Then, bend the second V-shaped groove 34 along the second bending line 33 of the blank plate 3. Then, reduce the number of upper die pieces in the second upper die assembly 12 and the number of lower die pieces in the second lower die assembly 22. Finally, bend the second V-shaped groove 34 along the last second bending line 33 of the blank plate 3. In this way, stair treads with ideal width and ideal height can be obtained.

[0071] The aforementioned stair tread bending mold also includes a connecting support 4 fixedly connected to the upper mold assembly 1, used to connect a stamping device, so that the stamping device drives the upper mold assembly 1 to press down the lower mold assembly 2 via the connecting support 4. In a first specific embodiment, the connecting support 4 includes an upper panel and a lower panel arranged opposite to each other, and a reinforcing plate vertically arranged between the upper panel and the lower panel. The upper panel of the connecting support 4 is provided with a snap-fit ​​groove 41, which is connected to the stamping device, facilitating the disassembly and assembly of the upper mold assembly 1, and making it more convenient to use. The snap-fit ​​groove 41 can specifically be a U-shaped groove symmetrically arranged on both sides of the upper panel, but is not limited to this.

[0072] Compared to the first embodiment, the second embodiment simplifies the structure of the upper mold component 1 and the lower mold component 2, while the rest of the technical solutions are the same as the first embodiment.

[0073] In the second specific embodiment, such as Figures 12 to 18 As shown, the upper mold assembly 1 does not have an upper mold piece, and the lower mold assembly 2 does not have a lower mold piece. The first upper mold assembly 11 includes a first upper mold 111 and a first upper mold piece 112, the first lower mold assembly 21 includes a first lower mold 211 and a first lower clamping plate 213, the second upper mold assembly 12 includes a second upper mold 121 and a second upper mold piece 122, and the second lower mold assembly 22 includes a second lower mold 22 and a second lower clamping plate 223.

[0074] During processing, the first upper mold assembly 11 and the first lower mold assembly 21 are placed on both sides of the blank plate 3 respectively, and the first V-groove 32 is formed by bending along the first bending line 31 of the blank plate 3. Then, the second upper mold assembly 12 and the second lower mold assembly 22 are placed on both sides of the blank plate 3 respectively, and the second V-groove 34 is formed by bending along the second bending line 33 of the blank plate 3. In this way, stair treads with ideal width and ideal height can be obtained.

[0075] This invention discloses a method for bending stair treads using the aforementioned stair tread bending mold, comprising the following steps:

[0076] The first step is to adjust the number of upper mold pieces in upper mold assembly 1, and simultaneously adjust the number of lower mold pieces in lower mold assembly 2. The number of upper and lower mold pieces can be adjusted according to the specifications of the stair treads.

[0077] The second step is to use the upper mold assembly 1 and the lower mold assembly 2, which are set up opposite to each other, to bend the first V-groove 32 along the first bending line 31 of the blank plate 3.

[0078] The third step is to readjust the number of upper mold pieces in upper mold assembly 1 and lower mold pieces in lower mold assembly 2.

[0079] The fourth step involves using the upper mold assembly 1 and the lower mold assembly 2, which are set up opposite to each other, to bend the second V-groove 34 along the secondary bending line 33 of the blank plate 3. The primary bending line 31 and the secondary bending line 33 are set alternately, so that the stair treads with the ideal width and ideal height can be obtained.

[0080] The steps of the above-mentioned method for bending stair treads also include:

[0081] Step 5: Remove the upper mold piece of upper mold assembly 1 and the lower mold piece of lower mold assembly 2.

[0082] Step 6: Using the relatively set upper mold assembly 1 and lower mold assembly 2, bend along the last secondary bending line 33 to form the second V-groove 34, so as to avoid the last second V-groove 34 being too wide and affecting the shape of the adjacent V-groove.

[0083] The method for bending stair treads provided by this invention has the same beneficial effects.

[0084] The bending mold and bending method for stair treads provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bending mold for stair treads, characterized in that, The assembly includes an upper die assembly (1) and a lower die assembly (2) arranged opposite to each other. The upper die assembly (1) includes an upper die with a V-shaped stamping head (10) and several upper die pieces fixed on both sides of the upper die and staggered along the two inclined extension surfaces of the V-shaped stamping head (10) to extend the length of the two sides of the V-shaped stamping head (10). The lower die assembly (2) includes a lower die with a V-shaped stamping groove (20) and several lower die pieces fixed on both sides of the lower die and staggered along the two inclined extension surfaces of the V-shaped stamping groove (20) to extend the length of the two sides of the V-shaped stamping groove (20). The V-shaped stamping head (10) cooperates with the V-shaped stamping groove (20). The upper mold assembly (1) also includes two upper clamping plates that are detachably fixed to the left and right sides of the upper mold and two lower clamping plates that are detachably fixed to the left and right sides of the lower mold. When bending along the first bend line (31), the opposite surfaces of the upper clamping plate and the lower clamping plate are both horizontal. When bending along the double bend line (33), the opposing surfaces of the upper clamping plate and the lower clamping plate are both wedge-shaped surfaces; First, adjust the number of the upper mold piece and the lower mold piece, then place any set of the upper mold assembly (1) and the lower mold assembly (2) on both sides of the blank plate (3), and bend the first V-groove (32) along the first bending line (31) of the blank plate (3); then, adjust the number of the upper mold piece and the lower mold piece, and bend the second V-groove (34) along the second bending line (33) of the blank plate (3), and the first bending line (31) and the second bending line (33) on the blank plate (3) are alternately set; Remove the upper mold piece of the upper mold assembly and the lower mold piece of the lower mold assembly, and use the relatively arranged upper and lower mold assemblies to bend the second V-groove along the last secondary bending line; when bending the blank plate, there is no need to flip the blank plate.

2. The bending mold for stair treads according to claim 1, characterized in that, A predetermined number of upper mold pieces are provided between each upper clamping plate and the upper mold; a predetermined number of lower mold pieces are provided between each lower clamping plate and the lower mold; the two upper clamping plates and the two lower clamping plates correspond to each other and abut against each other.

3. The bending mold for stair treads according to claim 2, characterized in that, The two upper clamping plates, all the upper mold pieces, and the upper mold are bolted together, and the two lower clamping plates, all the lower mold pieces, and the lower mold are bolted together.

4. The bending mold for stair treads according to any one of claims 1 to 3, characterized in that, It also includes a connecting support (4) that is fixedly connected to the upper die assembly (1) and used to connect to the stamping equipment.

5. The bending mold for stair treads according to claim 4, characterized in that, The upper panel of the connecting support (4) is provided with a snap-fit ​​groove (41) for connection with the stamping equipment.

6. A method for bending stair treads using a bending mold for stair treads according to any one of claims 1 to 5, characterized in that the steps include... include: Adjust the number of upper mold pieces in the upper mold assembly and the number of lower mold pieces in the lower mold assembly; The first V-groove is formed by bending the upper and lower die assemblies along the first bending line of the blank plate. The number of upper mold pieces in the upper mold assembly and the number of lower mold pieces in the lower mold assembly are adjusted again. The upper and lower die assemblies, which are arranged opposite to each other, are used to bend the blank plate along the secondary bending line to form a second V-shaped groove. The primary bending line and the secondary bending line are arranged alternately.

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