Bending die

Abstract

The invention discloses a bending die which comprises an upper die and a lower die which is oppositely arranged and used for bearing a plate. The bending die comprises an upper bending knife which is movably arranged on one side of a bending part of the plate; one end of the lower die inclines towards the other end from top to bottom to form a bent face, and the bent face corresponds to the bent part in the die closing state. The upper folding knife capable of moving longitudinally and transversely is matched with the bearing table of the lower die which is obliquely arranged, so that the die can be bent by more angles in the machining process, the situation that the assembling efficiency of a follow-up production line is affected by the elasticity and bending springback of materials is avoided, the situation that a to-be-slide block is arranged on the lower die to be bent is avoided, the machining difficulty is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of mold processing, and in particular relates to a bending mold. Background Art

[0002] With the rapid development of the home appliance industry, refrigerators, as an indispensable household appliance in modern families, are increasingly valued by consumers for their appearance design and manufacturing quality. As an important part of the appearance of refrigerators, refrigerator door shells are not only required to have good structural strength and durability, but also to have a beautiful appearance to attract consumers.

[0003] At present, in the production process of refrigerator door shells, the vertical bending forming method is adopted. The vertical downward bending causes the long contact surface between the bending knife and the product, which causes the zinc to be scratched and the product to rust. The problem can never be solved. Moreover, the angle rebounds after bending and cannot reach 90°, which seriously affects the assembly efficiency of the production line. The bending of the lower mold with a slider increases the difficulty of processing, the difficulty of research and development and the processing cost. The slider is partially weak and the life of the mold is reduced, which seriously affects customer satisfaction.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bending mold to increase the bending angle during the mold closing process and achieve the purpose of automatic demoulding.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A bending mold comprises an upper mold and a lower mold arranged opposite to each other and used for bearing a plate, comprising An upper folding knife is movably arranged on one side of the bending portion of the plate; One end of the lower mold is inclined from top to bottom toward the other end to form a bending surface, and the bending surface corresponds to the bending portion in the mold closing state.

[0007] Furthermore, the inclination of the bending surface (5) is a gradual transition; In the mold-closed state, the bent portion of the plate is inclined from top to bottom toward the bending surface; Preferably, the gradual transition is an inclined transition with at least one inclined angle, or a smooth transition with multiple inclined angles; More preferably, in the closed mold state, the bent inner surface of the plate is parallel to the inclined surface of the inclined transition, or the spacing increases gradually from top to bottom; More preferably, the bending surface extends from the upper end to the lower end of the lower mold in an inclined transition or an arc transition.

[0008] Further, the bending surface of the lower mold includes a protruding portion connected to the upper end of the lower mold and a flat portion smoothly connected to the protruding portion and extending toward the lower end of the lower mold; Preferably, the planar portion extends to the lower end of the lower mold; More preferably, the end of the upper end of the lower mold is connected to the end of the protruding portion.

[0009] Furthermore, with the mold closing state as a reference, the upper folding knife is inclined toward the bending portion of the plate.

[0010] Furthermore, a longitudinally movable scraper is provided on one side of the bending surface, and the scraper pushes the sheet to be demoulded during the transition between the closed mold state and the open mold state.

[0011] Furthermore, the scraper plate is arranged in close contact with the plane portion of the bending surface, and the scraper plate is longitudinally movable and is located at the lower side of the connection between the plane portion and the protruding portion.

[0012] Furthermore, a limit block is provided between the upper folding knife and the scraper plate, and the limit block is spaced apart from the bending portion of the plate; Preferably, the limiting block is arranged on the scraper plate.

[0013] Furthermore, the lower end of the scraper plate is connected to an elastic component, and the other end of the elastic component is connected to the base of the lower mold.

[0014] Furthermore, an upper slide seat insert knife is provided on the side of the upper folding knife away from the plate and is connected to the plate, an inclined surface is provided on the end of the upper slide seat insert knife facing the lower mold, and a lower sliding seat is fixedly provided on the lower mold corresponding to the upper slide seat insert knife, and the upper slide seat insert knife drives the upper folding knife to move toward the bending surface through the inclined surface.

[0015] Furthermore, the lower mold is also provided with a ejector pin for demoulding, and the ejector pin can be longitudinally moved to abut against the lower end of the plate; Preferably, the lower end of the ejection pin is connected to an elastic component, one end of the elastic component is connected to the ejection pin, and the other end is connected to the base of the lower mold.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. The present invention uses an upper folding knife that can move longitudinally and transversely, and cooperates with a bearing platform of a lower mold with a gradual transition, so that the mold can be bent at more angles during processing, avoiding the elasticity of the material itself, bending and rebounding, and affecting the assembly efficiency of the subsequent production line, and avoiding the lower mold setting a slider to be bent, reducing processing difficulty and saving costs; 2. The present invention demoulds the processed sheet through the provided scraper plate and the limit block, and then uses the limit block to avoid the risk of extrusion and damage to the sheet due to insufficient space between the scraper plate and the upper folding knife during the resetting process; 3. The present invention realizes automatic demoulding of the plate through the ejector pin, thereby improving processing efficiency and reducing damage to the plate caused by manual demoulding.

[0017] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings: Figure 1 It is a schematic diagram of the processing of the mold of the present invention Figure 1 ; Figure 2 The present invention Figure 1 A partially enlarged schematic diagram; Figure 3 It is a schematic diagram of the processing of the mold of the present invention Figure 2 ; Figure 4 It is a schematic diagram of the processing of the mold of the present invention Figure 3 .

[0019] In the figure: 1. upper mold; 2. lower mold; 3. upper stripping plate; 4. ejector pin; 5. bending surface; 6. plate; 61 bending part; 11. upper slide seat insert knife; 12. upper folding knife; 13. tool base; 21. scraper plate; 22. lower slide seat; 23. limit block.

[0020] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 4 As shown, an undercut bending die according to the present invention comprises an upper die 1 and a lower die 2 which is arranged opposite to each other and is used for carrying a plate 6; An upper folding knife 12 is movably arranged on one side of the bending part of the plate 6; One end of the lower mold 2 gradually transitions from top to bottom toward the other end to form a bending surface 5, and the bending surface 5 corresponds to the inner bending surface of the plate 6; In the mold-closed state, the bent inner surface of the plate 6 is inclined from top to bottom toward the lower mold 2 .

[0025] In this embodiment, a bending surface 5 is formed by gradually transitioning from one end of the lower mold 2 from top to bottom toward the other end of the lower mold 2, so that there is a certain space between the upper end of the bending surface 5 and the base of the lower mold 2, so that there is a certain transition undercut space during the bending process of the plate 6. The upper folding knife 12 moves vertically downward on one side of the bending part of the plate 6, bends the plate 6 at the part to be bent, and then moves toward the direction of the plate 6, so that the side of the plate 6 close to the lower mold 2 is inclined from top to bottom in the direction of the lower mold 2.

[0026] Specifically, the upper mold 1 is provided with an upper folding knife 12, and the upper folding knife 12 moves up and down with the upper mold 1, and then through the upper slide seat knife 11 connected to the upper folding knife 12, under the influence of the lower slide seat 22, the upper slide seat knife 11 drives the upper folding knife 12 to move in the direction of the plate 6, so that the bending part of the plate 6 is inclined toward the direction of the lower mold 2, deepening the bending angle, and achieving the purpose of bending, thereby avoiding the rebound of the material itself after vertical bending, which affects the subsequent assembly of the production line. The undercut is completed by the cooperation of the bending surface 5, the upper folding knife 12, the upper slide seat knife 11 and the lower slide seat 22, so that the bending part of the plate 6 after demoulding is maintained at 90 degrees, which is convenient for the installation of the subsequent production line.

[0027] In a further embodiment, the gradual transition is an inclined transition with at least one inclined angle, or a smooth transition with multiple inclined angles. In the closed mold state, the bent inner surface of the sheet 6 is parallel to the inclined surface of the inclined transition, or the spacing gradually increases from top to bottom.

[0028] Specifically, in one embodiment, the bending surface 5 formed by the gradual transition is an inclined surface at an angle, extending from the upper end to the lower end of the plate 6 supporting platform of the lower mold 2, so that the supporting platform of the lower mold 2 is an inverted cone. In another embodiment, the bending surface 5 formed by the gradual transition is an inclined surface at multiple angles, and the multiple inclined surfaces are connected to form a certain space between the upper end of the bending surface 5 and the lower end of the supporting platform of the lower mold 2. In the closed mold state, the bending portion 61 of the plate 6 is inclined in the space below the bending surface 5. In another embodiment, the gradual transition is a smooth curved surface, or a curved surface and an inclined surface are connected to form an irregular plane, so that the bending portion 61 of the plate 6 is inclined in the space below the bending surface 5. The distance between the inner curved surface of the plate 6 and the bending surface 5 gradually increases from top to bottom, so that the plate 6 maintains 90 degrees at the bending position after demolding, which is convenient for installation of subsequent production lines.

[0029] In a further embodiment, the bending surface 5 includes a protruding portion connected to the upper end of the lower mold 2 and a planar portion smoothly transitioning from the protruding portion to the lower end of the lower mold 2 .

[0030] Specifically, the protrusion extends from the end of the supporting platform of the lower mold 2 from top to bottom for a certain distance, and then extends vertically downward. The vertically extended part is a planar portion, so that a bending space is formed between the upper end of the bending surface 5 and the bottom end of the base of the lower mold 2. In a preferred embodiment, the end of the upper end of the protrusion is connected to the end of the supporting platform of the lower mold 2 as the same end.

[0031] In a further implementation scheme, the upper mold 1 includes an upper folding knife 12 and an upper slide seat knife 11 fixedly connected to the upper folding knife 12, one end of the upper slide seat knife 11 is connected to an elastic component, and the upper slide seat knife 11 is provided with an inclined surface on the side facing the lower mold 2, and a lower lower seat 22 is fixedly provided on the lower mold 2 corresponding to the upper slide seat knife 11, and the upper slide seat knife 11 and the upper folding knife 12 are driven to move by the inclined surface during the mold closing process.

[0032] Specifically, the upper mold 1 includes an upper folding knife 12 and an upper slide seat insert knife 11 fixedly connected to the upper folding knife 12, the upper slide seat insert knife 11 is located on the side of the upper folding knife 12 away from the plate 6, the upper folding knife 12 and the upper slide seat insert knife 11 are connected to a tool base 13, and the tool base 13 is movably arranged on the upper mold 1 through an elastic component. Preferably, the elastic component is a spring, and an inclined surface is provided at the bottom end of the upper slide seat insert knife 11, and a lower slide seat 22 is provided at the bottom of the lower mold 2 corresponding to the upper slide seat insert knife 11, and the lower slide seat 22 is fixed on the lower mold 2, and one end of the lower slide seat 22 close to the plate 6 is mapped on the inclined surface of the upper slide seat insert knife 11. In another embodiment, the upper end of the lower slide seat 22 is provided with an inclined surface, and the lower slide seat 22 is provided with an inclined surface. The mapping surface of the inclined surface mapped on the lower mold 2 and the mapping surface of the inclined surface of the lower end of the upper slide seat knife 11 mapped on the lower mold 2 partially overlap, so that when the upper slide seat knife 11 moves downward, the inclined surface of the upper slide seat knife 11 contacts the inclined surface of the lower seat 22. Taking the example that both the upper slide seat knife 11 and the lower seat 22 are provided with inclined surfaces, during the mold closing process, the inclined surface of the upper slide seat knife 11 contacts the lower seat 22, and the upper slide seat knife 11 is pushed to move obliquely in the direction of the plate 6 through the inclined surface, thereby driving the upper folding knife 12 to move obliquely in the direction of the plate 6, pushing the bending portion 61 of the plate 6 to bend toward the space below the bending surface 5, deepening the bending angle, so that after the plate 6 completes the mold closing action, the bending portion 61 of the plate 6 tilts toward the supporting platform of the lower mold 2.

[0033] In a further implementation scheme, a scraper plate 21 is also provided on the lower mold 2. The scraper plate 21 can be longitudinally moved to one side of the lower mold 2 support platform and at least partially abut against it. A limit block 23 is provided on the upper side of the scraper plate 21, and the limit block 23 is set corresponding to the position of the upper folding knife 12.

[0034] Specifically, a scraper plate 21 is provided on one side of the bearing platform of the lower mold 2, and an elastic component is connected to the bottom end of the scraper plate 21, and the other end of the elastic component is connected to the base of the lower mold 2. The scraper plate 21 can be longitudinally moved on one side of the bearing platform through the elastic component and abut against the side wall of the bearing platform on the adjacent side, and the abutting side wall can be a bending surface 5. The scraper plate 21 is on the longitudinal movement path of the upper folding knife 12, and a limit block 23 is provided on the upper side of the scraper plate 21, and the limit block 23 is between the scraper plate 21 and the upper folding knife 12. In one embodiment, the limit block 23 is arranged at the upper end of the scraper plate 21 and is spaced apart from the end of the bending portion 61 of the plate 6. In another embodiment, the limit block 23 is arranged at the lower end of the upper folding knife 12 and is spaced apart from the bending portion 61 of the plate 6. The ends of the folding portion 61 are arranged at intervals, and the distance between the upper and lower ends of the limit block 23 is slightly larger than the length of the bending portion 61 of the plate 6, so as to avoid the limit block 23 affecting the bending of the plate 6 during the mold closing process. Taking the limit block 23 set at the upper end of the scraper plate 21 as an example, during the mold closing process, the upper folding knife 12 moves with the upper mold 1 in the direction of the lower mold 2, contacts with the limit block 23 during the movement, continues to move downward, pushes the limit block 23 to move downward, and then pushes the scraper plate 21 to move downward. After the mold closing is completed, it starts to reset, and the upper mold 1 starts to move upward. Under the action of the elastic component, the scraper plate 21 pushes the scraper plate 21 to move upward, and the limit block 23 moves upward synchronously. During this process, the scraper plate 21 contacts the end of the bending portion 61 of the plate 6, pushing the plate 6 for preliminary demolding.

[0035] In a further embodiment, the lower mold 2 is provided with a ejector pin 4 which can be moved longitudinally, and the ejector pin 4 is located at the lower end of the plate 6 .

[0036] Specifically, the lower mold 2 is provided with a ejection pin 4, and the ejection pin 4 can be longitudinally moved to abut against the lower end of the plate 6. The bottom of the ejection pin 4 is connected to an elastic component, one end of the elastic component is connected to the bottom of the ejection pin 4, and the other end is connected to the base of the lower mold 2. In the mold opening state, the plate 6 is spaced apart from the supporting platform on its upper side due to the action of the ejection pin 4. In the process of mold closing, the elastic component is compressed and presses the plate 6 onto the supporting platform for bending. After the processing is completed, the upper mold 1 starts to move upward, the elastic component is reset, and pushes the plate 6 to be demolded.

[0037] In a further embodiment, an upper stripping plate 3 is further provided on the upper mold 1 , and the upper stripping plate 3 is arranged corresponding to the plate 6 , and the upper stripping plate 3 is located on one side of the upper folding knife 12 .

[0038] Specifically, an upper stripping plate 3 is provided on the upper mold 2, and the upper end of the upper stripping plate 3 is connected to the upper mold 2 body on the upper side of the upper stripping plate 3 through an elastic component. During the mold closing process, the upper stripping plate 3 is pressed on the plate 6 to prevent the plate 6 from shifting during processing and affecting the processing quality.

[0039] In a bending mold provided by the present invention, the upper mold 1 starts to move downward, or the upper mold 1 and the lower mold 2 move relatively, taking the upper mold 1 moving downward alone as an example, during the mold closing process, the upper mold 1 moves downward, and the upper folding knife 12, the upper slide seat inserting knife 11 and the upper stripping plate 3 move downward synchronously. During the downward process, the upper stripping plate 3 conflicts with the plate 6, and then pushes the plate 6 to contact the bearing platform. During this process, the ejector pin 4 moves downward synchronously, and the elastic component connected to the bottom thereof is contracted by force, and the upper mold 1 continues to move downward, and the upper folding knife 12 contacts the limit block 23 of the lower mold 2, thereby driving the limit block 23 to move downward, and synchronously driving the scraper plate 21 to move downward, and the elastic component connected to the bottom of the scraper plate 21 is compressed by force. During this process, the upper folding knife 12 contacts the bending portion 61 of the plate 6, driving the bending portion 61 to bend downward, and during the continued downward process, the inclined surface of the upper slide seat inserting knife 11 contacts the inclined surface of the lower slide seat 22, and the nitrogen spring is stretched, thereby pushing the upper slide seat inserting knife 11 toward the plate 6, and at the same time drives the upper folding knife 12 to move toward the bending portion 61, pushing the bending portion 61 to tilt in the direction of the bending surface 5. After the mold closing is completed, the upper mold 1 starts to move upward, driving the upper folding knife 12 and the upper slide seat inserting knife 11 to move upward. During the upward movement, the upper slide seat inserting knife 11 is reset in the direction away from the plate 6 due to the contraction of the nitrogen spring. At the same time, the limit block 23 and the scraper plate 21 move upward synchronously, and continue to move upward. The upper slide seat inserting knife 11 is separated from the lower slide seat 22, and the upper folding knife 12 is The limit block 23 disengages, and during this process, the upper end surface of the scraper plate 21 abuts against the end of the bending portion 61, thereby pushing the sheet 6 to be demoulded, and the sheet 6 and the upper demoulding plate 3 move up synchronously, and the upper mold 1 continues to move up, and the scraper plate 21 and the limit block 23 complete the reset, and the elastic component connected to the bottom of the ejection pin 4 is stretched to reset, pushing the ejection pin 4 to move upward, and then pushing the sheet 6 to be completely demoulded, and the upper mold 1 continues to move up, and the upper demoulding plate 3 is disengaged from the sheet 6 until the reset is completed.

[0040] The plate 6 in this embodiment is provided with a convex ridge, which is located on the inner surface of the bending portion 61 in the closed mold state. The convex ridge reduces the contact between the inner surface of the bending portion 61 of the plate 6 and the bending surface 5 during the resetting process, avoiding more scratches during the demolding process, which affects the actual use of the plate 6.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A bending die, comprising an upper die (1) and a lower die (2) arranged opposite to each other and used for supporting a plate (6), characterized in that: include An upper folding knife (12) is movably arranged on one side of the bending portion (61) of the plate (6); One end of the lower mold (2) is inclined from top to bottom toward the other end to form a bending surface (5), and the bending surface (5) corresponds to the bending portion (61) in the mold closing state.

2. A bending die according to claim 1, characterized in that: The inclination of the bending surface (5) is a gradual transition; In the mold-closed state, the bent portion (61) of the plate (6) is inclined from top to bottom in the direction of the bent surface (5); Preferably, the gradual transition is an inclined transition with at least one inclined angle, or a smooth transition with multiple inclined angles; More preferably, in the closed mold state, the inner bending surface of the plate (6) is parallel to the inclined surface of the inclined transition, or the spacing increases gradually from top to bottom; More preferably, the bending surface (5) extends from the upper end to the lower end of the lower mold (2) in an inclined transition or an arc transition.

3. A bending die according to claim 1 or 2, characterized in that: The bending surface (5) of the lower mold (2) comprises a protruding portion connected to the upper end of the lower mold (2) and a flat portion smoothly transitioning to the protruding portion and extending toward the lower end of the lower mold (2); Preferably, the plane portion extends to the lower end of the lower mold (2); More preferably, the end of the upper end of the lower mold (2) is connected to the end of the protruding portion.

4. A bending die according to any one of claims 1 to 3, characterized in that: In the mold closing state, the upper folding knife (12) is arranged at an inclination with a side facing the bending portion (61) of the plate (6).

5. A bending die according to any one of claims 1 to 4, characterized in that: A scraper plate (21) that can move longitudinally is provided on one side of the bending surface (5), and the scraper plate (21) pushes the plate (6) to be demoulded during the transition between the closed mold state and the open mold state.

6. A bending die according to claim 5, characterized in that: The scraper plate (21) is arranged in close contact with the plane portion of the bending surface (5), and the scraper plate (21) is longitudinally movable and is located at the lower side of the connection between the plane portion and the protruding portion.

7. A bending die according to claim 5 or 6, characterized in that: A limit block (23) is provided between the upper folding knife (12) and the scraper plate (21), and the limit block (23) is spaced apart from the bending portion (61) of the plate (6); Preferably, the limit block (23) is arranged on the scraper plate (21).

8. A bending die according to claim 7, characterized in that: The lower end of the scraper plate (21) is connected to an elastic component, and the other end of the elastic component is connected to the base of the lower mold (2).

9. A bending die according to claim 8, characterized in that: An upper slide seat insert knife (11) is provided on a side of the upper folding knife (12) away from the plate and connected thereto; an inclined surface is provided on one end of the upper slide seat insert knife (11) facing the lower mould (2); a lower lower seat (22) is fixedly provided on the lower mould (2) corresponding to the upper slide seat insert knife (11); the upper slide seat insert knife (11) drives the upper folding knife (12) to move in the direction of the bending surface (5) via the inclined surface.

10. A bending die according to claim 8, characterized in that: The lower mold (2) is also provided with a ejector pin (4) for demoulding, and the ejector pin (4) can be longitudinally moved to abut against the lower end of the plate (6); Preferably, the lower end of the ejection pin (4) is connected to an elastic component, one end of the elastic component is connected to the ejection pin (4), and the other end is connected to the base of the lower mold (2).

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