A steel bottom guard product punch forming die
Patent Information
- Application Number
- CN202522603580.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-09
AI Technical Summary
Traditional rigid stamping dies are difficult to effectively form the arc angles of complex three-dimensional curved surface structures, resulting in product cracking, wrinkling and insufficient dimensional accuracy, especially for steel bottom guard plate products with negative angle characteristics.
The stamping block assembly with elastic telescopic function, combined with the guide pillar and limit block design inside the mold, optimizes local features through flexible forming technology, reduces material deformation concentration, and achieves precise forming of arc corners.
It improves the dimensional accuracy and shape fit of the curved corners, reduces the risk of cracking and wrinkling, and extends the service life of the mold.
Smart Images
Figure CN224926877U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of stamping forming dies, and in particular to a stamping forming die for a steel bottom guard plate product. Background Technology
[0002] With the increasing demands for lightweight and high-strength components in industries such as automotive and machinery, the application of high-strength steel and ultra-high-strength steel is becoming more and more widespread. However, these materials present significant challenges in stamping processes, especially for structures with complex geometric features, such as arc angles and undercuts, as described below.
[0003] In the prior art, traditional stamping dies typically employ a rigid structure. This method is effective when the product structure is simple. However, for products as described in this application, the stamped arc-shaped corner structure on the outer blank holder of the body presents the following problems during the forming process: Especially for complex three-dimensional curved surfaces with similar "negative angle" characteristics, traditional one-piece rigid molds often cannot effectively form them in a single stamping, or the springback after forming is severe, affecting assembly accuracy. Moreover, in a one-time rigid stamping process, the material deformation in the arc-shaped corner area is severe and concentrated, which can easily lead to product cracking, wrinkling, or insufficient dimensional accuracy due to poor material flow.
[0004] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a stamping mold for steel bottom guard plate products, so as to make it more valuable for industrial use. Utility Model Content
[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a stamping mold for steel bottom guard plate products.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: A stamping die for a steel bottom guard plate includes an upper die base and a lower die base from top to bottom. An upper mold cavity plate is installed at the bottom of the upper die base, and a lower mold cavity assembly is installed on the lower die base below the upper mold cavity plate. The lower mold cavity assembly includes a lower mold cavity plate located at the top of the lower mold base, and a lower mold outer limiting frame is installed on the top of the lower mold base outside the lower mold cavity plate. The product to be processed is located between the upper mold cavity plate, the lower mold cavity plate and the lower mold outer limiting frame. The product includes a product body, with a downward-bent pressure edge on the outer side of the product body, and two downward-bent stamped arc angles on the pressure edge on one of the left or right sides of the product body along the front-back direction. A stamping block assembly with elastic telescopic function is installed at the bottom of the upper mold cavity plate directly above the stamping arc angle.
[0007] As a further improvement of this utility model, the stamping block assembly includes a stamping block body, and a stamping cavity is provided at the bottom of the stamping block body, which fits with the stamping arc angle below.
[0008] As a further improvement of this utility model, a stamping block upper contact groove is provided on the top of the stamping block body, and an upper stamping drive block is installed in the stamping block upper contact groove. The upper stamping drive block is connected to the upper mold cavity plate above through the upper stamping connecting block at the top.
[0009] As a further improvement of this utility model, a stamping guide post is also installed between the upper stamping drive block and the lower stamping block body, and the upper stamping drive block can move up and down in the contact groove on the stamping block body through the stamping guide post.
[0010] As a further improvement of this utility model, a spring is installed on the stamping guide post.
[0011] As a further improvement of this utility model, mold base guide pillars are installed around the upper mold base and the lower mold base, and the mold base guide pillars guide the upper mold base in the vertical direction.
[0012] As a further improvement of this utility model, at least one limiting block is installed between the upper mold base and the lower mold base. The limiting block is used to limit the movement of the upper mold base in the vertical direction.
[0013] As a further improvement of this utility model, the external mold limiting frame can move up and down under the drive of the lifting cylinder below and installed on the lower mold base.
[0014] By means of the above solution, this utility model has at least the following advantages: This invention integrates complex actions into the upper mold without changing the main working mode of the external press. Through the ingenious elastic structure design inside the mold, it achieves optimized forming of local features and is easy to promote and apply in the existing production system.
[0015] This invention, through an independent elastic stamping block assembly, can generate a slight time difference or pressure difference between the stamping action in the arc-shaped corner area and the stamping action in the main body area of the product, promoting the orderly flow of material to this area, effectively reducing the risk of cracking and wrinkling, and improving the dimensional accuracy and shape fit of the arc-shaped corner.
[0016] The elastic buffer design of this invention reduces the rigid impact of the stamping block on the product at the moment of contact in the arc-shaped corner area, reduces stress concentration, and thus slows down the wear rate of the stamping cavity.
[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of a stamping die for a steel bottom guard plate product according to this utility model; Figure 2 yes Figure 1 Internal structure diagram; Figure 3 yes Figure 2 A structural diagram of the product in the diagram; Figure 4 yes Figure 1 A schematic diagram of the structure after removing the upper mold base and upper mold cavity plate; Figure 5 yes Figure 4 A schematic diagram of the structure of the stamping block assembly in the middle; Figure 6 yes Figure 5 A schematic diagram of the structure on the other side.
[0020] The meanings of the labels in the figures are as follows.
[0021] Upper mold base 1, lower mold base 2, product 3, upper mold cavity plate 4, lower mold cavity assembly 5, mold base guide post 6, stamping block assembly 7; Product body 31, pressing edge 32, stamped arc angle 33; Lower mold cavity plate 51, lower mold outer limiting frame 52; The stamping block body 71, the upper contact groove of the stamping block 72, the upper stamping drive block 73, the upper stamping connecting block 74, and the stamping cavity 75. Detailed Implementation
[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0024] The first embodiment of this utility model: like Figure 1 and Figure 2 This embodiment of a stamping die for a steel bottom guard plate product mainly comprises, from top to bottom, an upper die base 1 and a lower die base 2. An upper mold cavity plate 4 is fixedly installed at the bottom of the upper die base 1. A lower mold cavity assembly 5 is installed at the top of the lower die base 2.
[0025] like Figure 4 The lower mold cavity assembly 5 is specifically composed of a lower mold cavity plate 51 located at the center and a lower mold outer limiting frame 52 surrounding the lower mold cavity plate 51. The product 3 to be stamped is placed in the forming space enclosed by the upper mold cavity plate 4, the middle lower mold cavity plate 51, and the outer lower mold outer limiting frame 52.
[0026] like Figure 3 The product 3 has a product body 31, and a pressing edge 32 that is bent downwards is provided on the outer periphery of the product body 31. In particular, on one of the pressing edges 32 on the left or right side of the product body 31, two specific local features are arranged along the front-back direction of the product, namely two stamping arc angles 33 that are further bent downwards.
[0027] like Figure 5 and Figure 6To specifically form these two stamping arc angles 33, a set of elastically telescopic stamping block assemblies 7 are independently installed at the bottom of the upper mold cavity plate 4 of this mold, directly above each stamping arc angle 33. The core of each set of stamping block assemblies 7 is the stamping block body 71, the bottom of which is machined with a stamping cavity 75 that perfectly matches the shape of the target stamping arc angle 33. At the top of the stamping block body 71, a stamping block upper contact groove 72 is provided. An upper stamping drive block 73 is installed in this stamping block upper contact groove 72, and the upper stamping drive block 73 is fixedly connected to the upper mold cavity plate 4 above it through an upper stamping connecting block 74 at its top.
[0028] To achieve the elastic extension function, a stamping guide post is provided between the upper stamping drive block 73 and the stamping block body 71. Specifically, the lower end of the stamping guide post is fixed to the stamping block body 71, and the upper end passes through a guide hole on the upper stamping drive block 73, allowing the upper stamping drive block 73 to move stably up and down along the stamping guide post within the contact groove 72 on the stamping block. A spring is fitted onto the stamping guide post. This spring is typically pre-compressed between the stamping block body 71 and the upper stamping drive block 73, providing downward elastic pressure and a rebound restoring force to the stamping block body 71.
[0029] To ensure the alignment accuracy of the upper and lower dies, several mold base guide pillars 6 are installed around the perimeter of the area between the upper mold base 1 and the lower mold base 2. These guide pillars 6 can precisely guide the upper mold base 1 and all its components to move vertically relative to the lower mold base 2. To further control the mold closing depth and prevent over-pressurization, at least one limiting block is also installed between the upper mold base 1 and the lower mold base 2. This limiting block is used to contact the corresponding part of the lower mold when the upper mold moves downward, thereby mechanically limiting the final downward position of the upper mold base 1 in the vertical direction.
[0030] Furthermore, the lower die outer limiting frame 52 is not completely fixed; it can move up and down under the drive of a lifting cylinder mounted on the lower die base 2. This design allows the lower die outer limiting frame 52 to descend and make room when placing the blank and removing the finished product, while rising to the working position during the stamping process to clamp the pressing edge 32 area of the product together with the lower die cavity plate 51 to control the material flow.
[0031] The second embodiment of this utility model: This embodiment provides a method specifically designed for processing such as Figure 3The stamping die for the steel bottom guard plate (i.e., product 3) shown is used. Product 3 is formed by stamping and bending sheet metal in one step, including a generally plate-shaped product body 31, with vertically downward-bent pressure edges 32 on the outer perimeter of the body. In particular, on the right pressure edge 32, there are two stamped arc-shaped corners 33 that are spaced apart front and back and bent inward and downward. This structure is used for subsequent assembly with other components.
[0032] The mold body includes an upper mold base 1 and a lower mold base 2 that are engaged by mold base guide pillars 6. An upper mold cavity plate 4 is fixed to the bottom of the upper mold base 1, and the shape of its lower surface matches the contour of the upper surface of the product body 31. A lower mold cavity plate 51 is fixed to the top of the lower mold base 2, and its contour matches the lower surface of the product body 31. A rectangular lower mold outer limiting frame 52 is provided on the outer side of the lower mold cavity plate 51. This limiting frame 52 is controlled by multiple lifting cylinders 9 at its bottom. Figure 1 (Only one schematic position is shown in the image) It is installed on the lower mold base 2 and can be lifted and lowered as a whole.
[0033] The core improvement of this embodiment lies in the treatment of the stamping arc angle 33. Directly above the two stamping arc angles 33, each of the upper mold cavity plates 4 contains an independent stamping block assembly 7. Each stamping block assembly 7 mainly includes a stamping block body 71 and an upper stamping drive block 73. The bottom of the stamping block body 71 is precision-machined with a stamping cavity 75 that perfectly matches the target arc angle 33. The top of the stamping block body 71 is machined with a stamping block upper contact groove 72. The lower part of the upper stamping drive block 73 is placed in this groove 72, and its top is fixedly connected to the upper mold cavity plate 4 via an upper stamping connecting block 74. The upper stamping drive block 73 and the stamping block body 71 are connected by two stamping guide posts 76, ensuring that they only slide relative to each other in the vertical direction. A spring 77 is fitted on the stamping guide post 76. In this embodiment, the lower end of the spring 77 abuts against the stamping block body 71, and the upper end abuts against the upper stamping drive block 73.
[0034] Four limiting blocks are also installed between the upper and lower mold bases to precisely control the gap between the upper mold cavity plate 4 and the lower mold cavity plate 51 when the mold is finally closed.
[0035] The working process of this embodiment: Preparation stage: The lifting cylinder drives the lower mold outer limit frame 52 to descend to the low position. The flat blank is placed on the lower mold cavity plate 51. Then the lifting cylinder drives the lower mold outer limit frame 52 to rise to the working position, where it and the lower mold cavity plate 51 together clamp the area of the blank where the pressing edge 32 will be formed.
[0036] During the downward stamping phase: The press drives the upper die holder 1 to descend as a whole. First, the upper die cavity plate 4 contacts the upper surface of the product body 31. At the same time, the stamping block assembly 7 descends with the upper die, and the stamping cavity 75 at the bottom of the stamping block body 71 contacts the area corresponding to the arc angle on the blank. Due to the support of the spring, the stamping block body 71 initially maintains a certain pressure in contact with the blank.
[0037] Flexible forming stage: The upper mold continues to descend, and the upper mold cavity plate 4 and the lower mold cavity plate 51 begin to form the main body of the product. At this time, due to the large deformation resistance of the material in the arc-shaped corner area, the stamping block body 71 will be subjected to an upward reaction force, begin to compress the spring, and retract upward relative to the fixed upper stamping drive block 73. This process achieves "flexible pressure" on the arc-shaped corner area. The pressure of the spring causes the material to gradually flow and fill into the arc-shaped corner cavity 75, while avoiding excessive thinning or tearing of the material caused by rigid impact.
[0038] Pressure holding and reset stage: The upper mold moves to the lower limit, the limit block 8 contacts, the mold is fully closed, the product is formed as a whole and undergoes a brief pressure holding. Then the upper mold moves upward, and each component resets under the rebound force of the spring 77 and the separation action of the mold itself. The stamping block body 71 returns to its initial position under the action of the spring and separates from the formed arc angle 33.
[0039] Part Removal Stage: The upper mold returns to its upper limit, and the lifting cylinder drives the lower mold outer limit frame 52 to descend, releasing the constraint on the product pressure edge 32, so that the stamped complete product 3 can be removed.
[0040] Through the above working process, this embodiment uses a specially designed stamping block assembly 7 to provide elastic buffering and adaptive pressing functions when stamping arc angle 33, effectively solving the problem of forming local complex features mentioned in the background art, and improving product quality and mold life.
[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A stamping die for a steel bottom guard plate product, comprising an upper die base (1) and a lower die base (2) from top to bottom, wherein an upper mold cavity plate (4) is installed at the bottom of the upper die base (1), and a lower mold cavity assembly (5) is installed on the lower die base (2) below the upper mold cavity plate (4). Its features are: The lower mold cavity assembly (5) includes a lower mold cavity plate (51) located at the top of the lower mold base (2). A lower mold outer limiting frame (52) is installed on the top of the lower mold base (2) outside the lower mold cavity plate (51). The product (3) to be processed is located between the upper mold cavity plate (4), the lower mold cavity plate (51) and the lower mold outer limiting frame (52). The product (3) includes a product body (31), and a pressing edge (32) bent downwards is provided on the outer side of the product body (31). Two stamping arc-shaped corners (33) bent downwards are provided on the pressing edge (32) on one side of the product body (31) along the front-back direction. A stamping block assembly (7) with elastic telescopic function is installed at the bottom of the upper mold cavity plate (4) directly above the stamping arc angle (33).
2. The stamping die for a steel bottom guard plate product as described in claim 1, characterized in that, The stamping block assembly (7) includes a stamping block body (71), and a stamping cavity (75) is provided at the bottom of the stamping block body (71), which is in contact with the stamping arc angle (33) below.
3. The stamping die for a steel bottom guard plate product as described in claim 2, characterized in that, A stamping block upper contact groove (72) is provided on the top of the stamping block body (71), and an upper stamping drive block (73) is installed in the stamping block upper contact groove (72). The upper stamping drive block (73) is connected to the upper mold cavity plate (4) above through the upper stamping connecting block (74) at the top.
4. The stamping die for a steel bottom guard plate product as described in claim 3, characterized in that, A stamping guide post is also installed between the upper stamping drive block (73) and the lower stamping block body (71). The upper stamping drive block (73) can move up and down in the stamping contact groove (72) of the stamping block body (71) through the stamping guide post.
5. The stamping die for a steel bottom guard plate product as described in claim 4, characterized in that, A spring is installed on the stamped guide post.
6. The stamping die for a steel bottom guard plate product as described in claim 1, characterized in that, Mold base guide posts (6) are installed around the upper mold base (1) and the lower mold base (2), and the mold base guide posts (6) guide the upper mold base (1) in the vertical direction.
7. The stamping die for a steel bottom guard plate product as described in claim 1, characterized in that, At least one limiting block is installed between the upper mold base (1) and the lower mold base (2), and the limiting block is used to limit the movement of the upper mold base (1) in the vertical direction.
8. The stamping die for a steel bottom guard plate product as described in claim 1, characterized in that, The external mold limiting frame (52) can move up and down under the drive of the lifting cylinder below and installed on the lower mold base (2).