Lower die for bending a steel sheet

Abstract

The utility model relates to machining technical field especially relates to a lower mould for steel plate bending, including bottom plate, two riser, two side plates and a plurality of seven prism made of nylon material, two riser fixed in the left and right ends of bottom plate, two side plates fixed in the front and back ends of bottom plate, and riser, side plate and bottom plate enclose the box body with opening, the bottom surface of all seven prism is arranged in the box body parallel to side plate, and the side surface of seven prism abuts on the upper plate surface of bottom plate, and the adjacent side surface of this side surface abuts on the plate surface of riser, and seven prism itself has V type groove structure, and one edge of seven prism constitutes groove bottom, and the two edges closest and about center symmetry constitute groove mouth, and the groove mouth of V type groove is vertical upward, and bottom plate, riser and side plate are metal plate, under the premise of guaranteeing the overall structural strength of lower mould, can disperse bending stress, reduce the damage to steel plate, improve bending process efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a lower die for bending steel plates. Background Technology

[0002] Steel plate bending is a cold working process that uses mechanical force to plastically deform steel plates between molds, processing flat metal into structural components (such as boxes, brackets, shells, etc.) with specific angles or arcs.

[0003] The bending process uses an upper and lower die to apply a vertical load to the steel plate through a press. The steel plate is subjected to three-point bending stress between the upper and lower dies, and permanent deformation is formed after the yield strength of the steel plate is reached.

[0004] In existing technology, the lower die is usually made of alloy steel V-shaped die. When the pressure applied by the upper die to the steel plate gradually increases, the stress on the two support points of the V-shaped die gradually increases. Since the hardness of the steel plate is lower than that of alloy steel, the stress on the two support points of the steel plate reaches the yield stress value before the V-shaped die, thus causing plastic deformation of the steel plate and producing marks at the two support points, which reduces the surface quality of the steel plate. Furthermore, due to process quality requirements, the marks need to be polished in subsequent processes. Polishing is time-consuming and reduces the efficiency of the bending process. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a lower die for bending steel plates, which solves the technical problems of V-die bending process in the prior art causing marks on the steel plate, which leads to the need for further polishing of the marks, which is time-consuming and has low bending process efficiency.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a lower die for bending steel plates, comprising a base plate, two upright plates, two side plates, and multiple heptagonal prisms made of nylon material. The two upright plates are fixedly connected to the left and right ends of the base plate, and the two side plates are fixedly connected to the front and rear ends of the base plate. The two upright plates, two side plates, and the base plate form an upward-opening box structure. The multiple heptagonal prisms are placed inside the box, corresponding one-to-one with the two upright plates, abutting against the upright plates and adjacent to the two side plates. Two opposite faces of the multiple heptagonal prisms are inclined to form V-shaped grooves, and the openings of the V-shaped grooves constitute two fulcrums when bending the steel plate. The base plate, two upright plates, and two side plates are all metal plates.

[0010] Optionally, the two upright plates are vertically welded to the left and right end faces of the base plate, respectively; and the two side plates are vertically welded to the front and rear end faces of the base plate, respectively.

[0011] Optionally, all heptagonal prisms are right prisms with a cross-section of a heptagon with four right angles; the upper surface of each heptagonal prism is flush with the upper surface of the two uprights.

[0012] Optionally, a V-shaped opening is recessed at the middle of the upper end of the two side plates. The V-shaped opening is aligned with the V-shaped groove. The apex of the V-shaped opening is lower than the height of the apex of the V-shaped groove. The angle of the V-shaped opening is greater than or equal to the angle of the V-shaped groove opening.

[0013] Optionally, locking elements are detachably connected to the left and right ends of the side plates respectively; the locking elements of the two side plates pass through the side plates in the front-back direction and abut against the bottom surface of the heptagonal prism, and the locking elements can restrict the movement of the heptagonal prism in the front-back direction.

[0014] Optionally, the locking element is a bolt; the left and right ends of the side plate are respectively provided with threaded holes adapted to the bolts, and multiple heptagonal prisms are tightened by bolts on the left or right ends of the two side plates to restrict the movement of the heptagonal prisms in the front-back direction.

[0015] Optionally, it also includes two force-applying components fixed at the front and rear ends of the housing; the two force-applying components are fixed at the middle position of the two side plates.

[0016] Optionally, the force-applying component includes a lifting ring mounting base and a lifting ring; the lifting ring mounting base is fixed to the end of the side plate away from the heptagonal prism; the lifting ring is fitted into the lifting ring mounting base.

[0017] Optionally, the base plate, the two upright plates, and the two side plates are all made of carbon steel.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are as follows: This utility model provides a lower die for bending steel plates, comprising a base plate, two upright plates, two side plates, and multiple heptagonal prisms made of nylon material. The base plate provides basic support, and the upright plates and side plates are fixedly connected to form a box structure. Multiple heptagonal prisms are placed inside the box, corresponding one-to-one with the two upright plates, abutting against the upright plates and adjacent to the two side plates. Two opposite faces of the multiple heptagonal prisms are inclined to form V-grooves. The openings of the V-grooves constitute two fulcrums when bending the steel plate, ensuring that the steel plate maintains a straight line and symmetrical bending during the bending process. The base plate, upright plates, and side plates are all metal plates, ensuring the overall structural strength of the lower die. Compared to existing technologies, nylon material has a certain degree of elasticity, which can effectively disperse bending stress, thereby reducing damage to the steel plate, reducing the unevenness and deformation of the steel plate during bending, avoiding the need for subsequent polishing, and improving the bending process efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a top perspective three-dimensional schematic diagram of a lower die for bending steel plates according to the present invention;

[0021] Figure 2 This is a bottom perspective three-dimensional schematic diagram of a lower die for bending steel plates according to the present invention;

[0022] Figure 3 This is a cross-sectional view of a heptagonal prism used for bending steel plates according to the present invention, along the vertical direction.

[0023] Explanation of reference numerals in the attached figures

[0024] 1: Base plate; 2: Vertical plate; 3: Side plate; 4: Heptagonal prism; 5: Force-applying component; 51: Lifting ring mounting base; 52: Lifting ring. Detailed Implementation

[0025] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," "left," "right," "front," and "rear" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0027] Example 1:

[0028] Reference Figures 1-3 The lower die for bending steel plates proposed in this embodiment includes a base plate 1, two upright plates 2, two side plates 3, and multiple heptagonal prisms 4 made of nylon material.

[0029] Two upright plates 2 are fixedly connected to the left and right ends of the base plate, and two side plates 3 are fixedly connected to the front and rear ends of the base plate. The two upright plates 2, the two side plates 3 and the base plate form a box structure with the opening facing upward.

[0030] Specifically, the base plate 1, upright plates 2, and side plates 3 are rectangular metal plates. The two upright plates 2 are vertically welded to the left and right end faces of the base plate 1, respectively, and the two side plates 3 are vertically welded to the front and rear end faces of the base plate 1, respectively. The base plate, the two upright plates 2, and the two side plates 3 together form an upward-opening box structure. In a specific embodiment, the base plate 1, the two upright plates 2, and the two side plates 3 are all made of carbon steel.

[0031] More specifically, the upper middle position of the two side plates 3 is recessed to form a V-shaped opening, the V-shaped opening is aligned with the V-shaped groove, the apex of the V-shaped opening is lower than the height of the apex of the V-shaped groove, and the angle of the V-shaped opening is greater than or equal to the angle of the V-shaped groove opening. That is, when the steel plate is bent, the deformation is only in the V-shaped groove area, avoiding the V-shaped opening from interfering with the bending of the steel plate. In other embodiments, the side plate 3 can also be set with a height lower than the apex of the V-shaped groove, which can avoid the side plate 3 from overlapping with the V-shaped groove and occupying the bending area of ​​the V-shaped groove steel plate.

[0032] Multiple heptagonal prisms 4 are placed inside the box, corresponding one-to-one with two upright plates 2. Specifically, a row of heptagonal prisms 4 is positioned adjacent to the upright plates 2 on both sides, with the prisms 4 abutting against the inner side of their respective upright plates 2. Simultaneously, each row of heptagonal prisms 4 is adjacent to two side plates 3. Two opposing faces of the multiple heptagonal prisms 4 are beveled to form V-grooves. The openings of the V-grooves constitute two fulcrums during the bending of the steel plate. The V-grooves guide the steel plate along the direction of the V-grooves, preventing the steel plate from shifting during bending and ensuring the overall shape of the steel plate. Furthermore, the V-groove structure is simple, easy to process, and reduces the complexity of the mold and manufacturing costs. In the steel plate bending process, there are three support points on the steel plate when bending it. The first is the contact point between the upper mold and the steel plate when the upper mold presses the steel plate down. The second and third are the contact points between the steel plate and the heptagonal prism 4. In this utility model, specifically, the uppermost edge of the two opposite inclined surfaces forming the V-shaped groove of a row of heptagonal prisms 4 are the two support points when bending the steel plate.

[0033] In a specific embodiment, a row of heptagonal prisms 4 includes multiple heptagonal prisms 4 arranged sequentially in the front-to-back direction. Two opposing inclined surfaces of the multiple heptagonal prisms 4 together form a V-shaped groove. The foremost heptagonal prism 4 in the row abuts against the front side plate 3, and the last heptagonal prism 4 abuts against the rear side plate 3. The left-side face of the heptagonal prism 4 abuts against the left-side vertical plate 2, and the right-side face of the heptagonal prism 4 abuts against the right-side vertical plate 2. It should be noted that the number of heptagonal prisms 4 in a row can be flexibly adjusted according to the actual width of the steel plate or the bending machine, and is not limited to four heptagonal prisms 4.

[0034] Specifically, all heptagonal prisms 4 are right prisms with a cross-section of a heptagon having four right angles; the upper surface of each heptagonal prism 4 is flush with the upper surface of the two vertical plates 2. It should be noted that the heptagonal prism 4 consists of seven lateral faces and two bases. Five of the seven lateral faces are perpendicular to each other, and the remaining two lateral faces form the inclined surfaces of the V-shaped groove. The upper and lower bases are parallel and perpendicular to the seven lateral faces. Three perpendicular lateral faces of each heptagonal prism 4 abut against the base plate and the vertical plate respectively. The upper base of the heptagonal prism 4 at the front and the lower base of the heptagonal prism 4 at the back of a row rest on the side plates 3 respectively. The upper and lower bases of the two middle heptagonal prisms 4 abut against the lower and upper bases of the adjacent heptagonal prisms 4 respectively.

[0035] Because the heptagonal prism 4 is made of nylon, and nylon is less hard than carbon steel, when the steel plate is subjected to pressure from the upper mold, the heptagonal prism 4 undergoes slight elastic deformation, dispersing the stress at the contact point, preventing local yielding of the steel plate, reducing stress concentration, thereby reducing the formation of nicks, reducing the time required for polishing the steel plate, and improving the efficiency of the steel plate bending process. Furthermore, during the steel plate bending process, the heptagonal prism 4 is prone to wear after prolonged use, specifically on the uppermost edge of the bevel of a row of heptagonal prism 4. Wear will cause changes in the dimensions of the heptagonal prism 4, thus affecting the dimensions of the bent steel plate and easily leading to deviations, resulting in failure to meet the dimensional accuracy requirements after bending. By setting multiple independent heptagonal prisms 4, the heptagonal prisms with high wear can be replaced selectively without replacing the entire mold, thus saving mold costs and facilitating mold maintenance and replacement.

[0036] Furthermore, locking components are detachably connected to the left and right ends of the side plates 3 respectively; the locking components of the two side plates 3 pass through the side plates 3 in the front-back direction and abut against the bottom surface of the heptagonal prism 4. The locking components can restrict the movement of the heptagonal prism 4 in the front-back direction, ensuring the stability of the heptagonal prism 4 in the box and preventing the heptagonal prism 4 from being displaced due to external forces during the bending of the steel plate, thus providing stable support for the bending operation of the steel plate. It should be noted that the locking components are not limited to being set on both side plates 3; locking components can also be set on only one side plate 3, that is, only the front side plate 3 or the rear side plate 3, which can also meet the requirements for fixing the heptagonal prism 4.

[0037] Specifically, the locking element is a bolt; the left and right ends of the side plate 3 are respectively provided with threaded holes adapted to the bolts, and the heptagonal prism 4 is tightened by the bolts on the left and right ends of the two side plates 3 to restrict the movement of the heptagonal prism 4 in the front-back direction. In a specific embodiment, each of the two side plates 3 is provided with two M10 bolts symmetrical about the center line of the long side, and the two M10 bolts on the left and right ends are used to fix a row of heptagonal prisms 4.

[0038] Furthermore, it also includes two force-applying components 5 fixed at the front and rear ends of the box; the two force-applying components 5 are respectively fixed in the middle position of the two side plates 3. The purpose of setting the force-applying components 5 is to provide the operator with a stable force application point, which is convenient for handling or installing the lower mold. It should be noted that the installation position of the force-applying components 5 can be adjusted according to the actual structure of the box or the requirements of the bending operation. The purpose is to provide a stable force application point, which can be operated conveniently and effortlessly. In a specific embodiment, since the length of the side plate 3 is shorter than that of the vertical plate 2, the force-applying component 5 is set in the middle position of the side plate 3. The side plate 3 is shorter than the vertical plate 2. In actual operation, the side with the shorter plate is easier to apply force and control. Due to its length and center of gravity distribution, the side with the longer plate is more difficult to grip and is more prone to shaking, which is not conducive to safety during handling. On the other hand, the force-applying component 5 is set on the two side plates 3, which also ensures that the lower die can be accurately and stably embedded in the bending machine when it is used with the bending machine. The setting of the force-applying component 5 enables the operator to accurately install the lower die in the corresponding position of the bending machine, ensuring that the lower die can be smoothly and firmly embedded in the corresponding part of the bending machine, so that the bending machine can accurately perform bending operation on the sheet metal, thereby improving the efficiency and quality of production and processing.

[0039] Specifically, the force-applying component 5 includes a lifting ring mounting base 51 and a lifting ring 52. The lifting ring mounting base 51 is fixed to one end of the side plate 3. The lifting ring 52 is fitted into the lifting ring mounting base 51, and the lifting ring 52 can rotate and swing flexibly to adapt to different operational needs, providing operators with great convenience and flexibility when handling or installing the lower mold. In a specific embodiment, the lifting ring 52 is a D-shaped lifting ring, the lifting ring mounting base 51 has a C-shaped cross-section with its opening facing the side plate 3, and the lifting ring mounting base 51 and the side plate 3 form a through hole. The vertical end of the lifting ring 52 is fitted into the through hole, and the arc-shaped end of the lifting ring 52 can rotate 180° around the axis of the through hole.

[0040] It should be noted that the shape of the force-applying component 5 is not limited to the lifting ring 52. Other shapes of force-applying components 5, such as handles, can also be used. The purpose is to provide a stable force-applying point and improve the safety of operation.

[0041] In practice, the operator moves the lower die to the work area using the force-applying component 5, places the lower die on the worktable of the bending machine, and the entire lower die is in a horizontal state; the locking component is installed on the side plate 3, and the heptagonal prism 4 is locked to fix its position; the upper die is installed above the lower die, aligned with the V-groove of the lower die, and pressure is applied to the steel plate to perform the bending operation.

[0042] Example 2:

[0043] Based on the aforementioned embodiments, while maintaining the main structure and function of the lower die for bending steel plates, this embodiment adds an anti-slip design to the surface of the force-applying component 5.

[0044] Specifically, when the force-applying component 5 is a lifting ring 52, anti-slip textures or rubber anti-slip sleeves are provided at the arc-shaped end of the lifting ring 52 to increase the friction when the operator grips the force-applying component 5, avoid slipping due to sweaty or oily hands, and improve the safety of operation.

[0045] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lower die for bending steel plates, characterized in that, It includes a base plate (1), two upright plates (2), two side plates (3) and multiple heptagonal prisms (4) made of nylon material; The two upright plates (2) are fixedly connected to the left and right ends of the base plate (1), and the two side plates (3) are fixedly connected to the front and rear ends of the base plate (1). The two upright plates (2), the two side plates (3) and the base plate (1) form a box structure with the opening facing upward. Multiple heptagonal prisms (4) are placed inside the box in a one-to-one correspondence with two of the upright plates (2), abutting against the upright plates (2) and adjacent to the two side plates (3); Two opposite faces of the plurality of heptagonal prisms (4) are inclined to form a V-groove, the opening of the V-groove forming two fulcrums when bending the steel plate; The base plate (1), the two upright plates (2), and the two side plates (3) are all metal plates.

2. The lower die for bending steel plates as described in claim 1, characterized in that: The two vertical plates (2) are respectively welded vertically to the left and right end faces of the base plate (1); The two side plates (3) are respectively welded vertically to the front and rear end faces of the base plate (1).

3. The lower die for bending steel plates as described in claim 2, characterized in that, The heptagonal prisms (4) are all right prisms with a cross-section of a heptagon with four right angles; The upper surface of each of the heptagonal prisms (4) is flush with the upper surface of the two vertical plates (2).

4. The lower die for bending steel plates as described in claim 3, characterized in that, The upper middle position of the two side plates (3) is recessed to form a V-shaped opening, the V-shaped opening is aligned with the V-shaped groove, the apex of the V-shaped opening is lower than the height of the apex of the V-shaped groove, and the angle of the V-shaped opening is greater than or equal to the angle of the V-shaped groove opening.

5. The lower die for bending steel plates as described in claim 1, characterized in that, The left and right ends of the side plate (3) are respectively detachably connected to locking components; The locking members of the two side plates (3) pass through the side plates (3) in the front-back direction and abut against the bottom surface of the heptagonal prism (4). The locking members can restrict the movement of the heptagonal prism (4) in the front-back direction.

6. The lower die for bending steel plates as described in claim 5, characterized in that, The locking component is a bolt; The left and right ends of the side plate (3) are respectively provided with threaded holes that are compatible with the bolts. The multiple heptagonal prisms (4) are tightened by the bolts on the left or right ends of the two side plates (3) to restrict the movement of the heptagonal prisms (4) in the front-back direction.

7. The lower die for bending steel plates as described in claim 1, characterized in that, It also includes two force-applying components (5) fixed at the front and rear ends of the housing; The two force-applying components (5) are respectively fixed at the middle position of the two side plates (3).

8. The lower die for bending steel plates as described in claim 7, characterized in that, The force-applying component (5) includes a lifting ring mounting base (51) and a lifting ring (52); The lifting ring mounting base (51) is fixed to one end of the side plate (3) away from the heptagonal prism (4); The lifting ring (52) is fitted into the lifting ring mounting base (51).

9. The lower die for bending steel plates as described in claim 1, characterized in that, The base plate (1), the two upright plates (2), and the two side plates (3) are all made of carbon steel.

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