Punch forming die

Abstract

The utility model relates to a punch forming die which comprises a lower die base and an upper die base, the upper portion of the lower die base is provided with a first contact face, the first contact face is provided with a forming cavity, a jacking piece is connected in the forming cavity in a sliding mode, and a first jacking face is formed on the upper portion of the jacking piece. The upper die base comprises a main body plate, a punch is connected to the main body plate, a stripper plate is movably connected to the lower portion of the main body plate, a sliding cavity is formed in the stripper plate, the punch is connected into the sliding cavity in a sliding mode and can stretch into the forming cavity, a second contact face is formed on the lower portion of the stripper plate, and a blank is placed between the second contact face and the first contact face. When the die is in a stamping state, the punch stretches into the forming cavity through the sliding cavity and is used for abutting against the first jacking face of the jacking piece, and a first gap is formed between the outer wall of the punch and the inner wall of the forming cavity. According to the utility model, the product processing efficiency and the product quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of stamping forming technology, and in particular to a stamping forming die. Background Technology

[0002] For some tubular parts such as pipes and bushings, two methods can be used for manufacturing. One method involves bending sheet metal and then welding it. This method is affected by the welding process and has certain requirements on the sheet metal thickness, which must be at least greater than 0.15 mm. This makes it impossible to manufacture thin-walled tubular parts, and this manufacturing method has low production efficiency and is prone to welding defects in the finished product. The other method is to use a tube drawing process, such as... Figure 1 As shown, it generally requires multiple processes such as stretching, punching, and flanging. Parts made by this tube drawing process usually have a flange edge 10, which needs to be cut off separately. The whole process requires changing a variety of different molds, punches, and stations to achieve different processes. The whole process is complex and cannot guarantee the uniformity of the wall thickness of the final product. Therefore, the existing preparation equipment cannot efficiently obtain high-quality molded products and cannot meet production needs. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to improve the processing efficiency and processing quality of cylindrical products in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a stamping die, comprising,

[0005] The lower mold base has a first contact surface on its upper part, and a molding cavity is formed on the first contact surface. A lifting member is slidably connected in the molding cavity, and the upper part of the lifting member forms a first lifting surface.

[0006] The upper mold base includes a main body plate, a punch connected to the main body plate, a stripper plate movably connected to the lower part of the main body plate, a sliding cavity formed on the stripper plate, the punch being slidably connected in the sliding cavity and extending into the forming cavity, and a second contact surface formed on the lower part of the stripper plate, with a blank placed between the second contact surface and the first contact surface.

[0007] When the stamping die is in the stamping state, the punch extends through the sliding cavity and into the forming cavity and is used to abut against the first lifting surface of the lifting member. A first gap is formed between the outer wall of the punch and the inner wall of the forming cavity. The abutting surface of the punch when it abuts against the first lifting surface is located inside the first lifting surface.

[0008] In one embodiment of this utility model, the end of the lifting member away from the first lifting surface is connected to the bottom surface of the forming cavity through a first elastic member, and the main body plate and the stripping plate are connected through a second elastic member.

[0009] In one embodiment of this utility model, the punch is provided with the second elastic element on both sides, one end of each second elastic element is connected to the main body plate, and the other end is connected to the stripper plate.

[0010] In one embodiment of this utility model, the second elastic elements on both sides of the punch are arranged symmetrically.

[0011] In one embodiment of this utility model, the end of the molding cavity near the first contact surface is connected to the first contact surface through a first transition portion, and the first transition portion is arc-shaped.

[0012] In one embodiment of this utility model, the end of the punch facing the first lifting surface is provided with a rounded corner.

[0013] In one embodiment of this utility model, the axes of the sliding cavity and the forming cavity coincide.

[0014] In one embodiment of this utility model, both the first contact surface and the second contact surface are planar.

[0015] In one embodiment of this utility model, the blank is an annular plate, the punch and the forming cavity are both cylindrical, the outer diameter of the blank is larger than the diameter of the forming cavity, and the inner diameter of the blank is smaller than the outer diameter of the punch.

[0016] In one embodiment of this utility model, the lifting member is cylindrical, the outer diameter of the lifting member is larger than the outer diameter of the punch, and the outer diameter of the lifting member is not larger than the diameter of the forming cavity.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] The stamping die described in this utility model greatly improves product processing efficiency, reduces production costs, and also makes the formed products have better processing precision and better finished product quality. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a flowchart of the tube drawing process in the existing technology;

[0021] Figure 2 This is a schematic diagram of the upper die base of the stamping die in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the lower die base of the stamping die in this utility model;

[0023] Figure 4 This is a schematic diagram of the stamping die in the open state (open state) of this utility model;

[0024] Figure 5 yes Figure 4 The front view of the structure;

[0025] Figure 6 yes Figure 5 A cross-sectional view of the structure;

[0026] Figure 7 yes Figure 6 A magnified view of a portion of point M in the middle;

[0027] Figure 8 This is a schematic diagram of the stamping die in the closed stamping state in this utility model;

[0028] Figure 9 yes Figure 8 A cross-sectional view of the structure;

[0029] Figure 10 yes Figure 9 A magnified view of a portion of point N in the diagram;

[0030] Figure 11 This is a schematic diagram showing the positions of the punch and the cylindrical product during the forming process;

[0031] Figure 12 This is a flowchart of the molding process of this utility model;

[0032] Explanation of reference numerals on the accompanying drawings:

[0033] 10. Flange edge;

[0034] 20. Upper die holder; 201. Main body plate; 202. Punch; 2021. Rounded corners; 203. Stripper plate; 2031. Sliding cavity; 2032. Second contact surface; 204. Second elastic element;

[0035] 30. Lower mold base; 301. First contact surface; 302. Molding cavity; 3021. First transition section; 3022. First gap; 303. Elevating element; 3031. First lifting surface; 304. First elastic element;

[0036] 40. Billet;

[0037] 50. Cylindrical products. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure or its application or use.

[0039] In the description of this utility model, it should be understood that the terms "vertical," "upper," "lower," "top," "side," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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 the utility model. Furthermore, 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. Thus, 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, unless otherwise stated, "a plurality of" means two or more.

[0040] 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 according to the specific circumstances.

[0041] Example

[0042] See Figures 2-11 This embodiment discloses a stamping die, including a lower die base 30 and an upper die base 20;

[0043] like Figure 3 As shown, the upper part of the lower mold base 30 has a first contact surface 301, and a molding cavity 302 is provided on the first contact surface 301. A lifting member 303 is slidably connected in the molding cavity 302. The upper part of the lifting member 303 forms a first lifting surface 3031 for lifting the molded product.

[0044] like Figure 2As shown, the upper die base 20 includes a main body plate 201, on which a punch 202 for stamping and stretching the blank 40 is fixed. A stripper plate 203 is movably connected to the lower part of the main body plate 201. A sliding cavity 2031 is formed on the stripper plate 203. The punch 202 is slidably connected in the sliding cavity 2031 and can extend into the forming cavity 302 during forming. A second contact surface 2032 is formed at the lower part of the stripper plate 203. The blank 40 is placed between the second contact surface 2032 and the first contact surface 301.

[0045] Among them, such as Figures 8-10 As shown, when the stamping die is in the stamping state, the punch 202 extends through the sliding cavity 2031 and into the forming cavity 302 to abut against the first lifting surface 3031 of the lifting member 303. A first gap 3022 is formed between the outer wall of the punch 202 and the inner wall of the forming cavity 302. The abutting surface of the punch 202 when it abuts against the first lifting surface 3031 is located inside the first lifting surface 3031, that is, the outer edge of the first lifting surface 3031 should be located outside the outer edge of the abutting surface of the punch 202. For example, if both the punch 202 and the lifting member 303 are cylindrical, then the outer diameter of the lifting member 303 should be larger than the outer diameter of the punch 202 so that the lifting member 303 can support the formed product, prevent the product from falling, and facilitate the subsequent removal of the product.

[0046] The aforementioned first gap 3022 is the receiving cavity of the final product, and the first gap 3022 is basically equal to the wall thickness of the final product.

[0047] The mold with the above structure can directly stamp and stretch the plate / sheet-shaped annular blank 40 into a seamless cylindrical product 50, forming it in one step. The product has high precision, which also greatly improves production efficiency and reduces production costs.

[0048] Understandably, the aforementioned "cylindrical product" can be understood as a product with a cavity.

[0049] In some implementations, such as Figure 6 As shown, the end of the lifting member 303 away from the first lifting surface 3031 is connected to the bottom surface of the forming cavity 302 through the first elastic member 304, and the main body plate 201 and the stripping plate 203 are connected through the second elastic member 204.

[0050] The lifting member 303 can be reset under the action of the first elastic member 304, and during the reset process, the molded product is lifted out of the molding cavity 302 so that the product can be taken out.

[0051] The stripper plate 203 can float relative to the main plate 201 under the action of the second elastic member 204, so that the punch 202 can extend or retract. For example, in the stamping state, the punch 202 extends and gradually extends into the forming cavity 302.

[0052] The first elastic element 304 and the second elastic element 204 mentioned above can both be springs, deformable metal sheets, rubber parts, or other elastic components.

[0053] Furthermore, a second elastic element 204 is provided on both sides of the punch 202. One end of each second elastic element 204 is connected to the main body plate 201, and the other end is connected to the stripper plate 203, so as to better ensure the stability of the stamping.

[0054] Furthermore, the second elastic elements 204 on both sides of the punch 202 are arranged symmetrically to better ensure the stability of the movement of the punch 202.

[0055] Alternatively, two or more second elastic elements 204 can be provided around the punch 202. In this case, each second elastic element 204 can be evenly distributed around the punch 202 in a circumferential manner to further ensure the stability of the stamping process.

[0056] In some implementations, such as Figure 2 and Figure 7 As shown, the end of the forming cavity 302 near the first contact surface 301 is connected to the first contact surface 301 through the first transition part 3021. The first transition part 3021 is arc-shaped, and a rounding process can be used for processing. With the setting of the first transition part 3021, the blank 40 can enter the forming cavity 302 more smoothly under the punching of the punch 202, and it can also protect the blank 40 and prevent the blank 40 from being scratched.

[0057] Furthermore, such as Figure 10 and Figure 11 As shown, the end of the punch 202 facing the first lifting surface 3031 can also be provided with a rounded corner 2021, which is more conducive to the stamping and stretching of the blank 40, and can also effectively prevent surface scratches on the blank 40 during the forming process, thereby improving the surface quality of the product.

[0058] In some implementations, the axes of the sliding cavity 2031 and the forming cavity 302 coincide to better ensure the product forming effect.

[0059] In some embodiments, the first contact surface 301 and the second contact surface 2032 are both planar to increase their contact area with the blank 40 and ensure the molding effect.

[0060] The forming process using the above-mentioned stamping die is described in detail below, taking a mold equipped with a first elastic element 304 and a second elastic element 204 as an example. The process includes the following steps:

[0061] Step S1), as follows Figures 8-7As shown, the blank 40 is placed on the first contact surface 301 of the lower mold base 30. The blank 40 is an annular plate, so that the blank 40 is located directly above the forming cavity 302. For example, the axis of the blank 40 coincides with or approximately coincides with the axis of the forming cavity 302.

[0062] Step S2) Drive the upper mold base 20 to move to the lower mold base 30 until the second contact surface 2032 of the stripper plate 203 contacts the blank 40. At this time, the blank 40 is clamped between the first contact surface 301 and the second contact surface 2032, and the initial mold closing is achieved.

[0063] Step S3) Drive the main body plate 201 to move downward to the mold base 30, so that the punch 202 extends out from the sliding cavity 2031 of the stripper plate 203 and abuts against the blank 40 and gradually enters the forming cavity 302. The middle part of the blank 40 gradually bends and deforms downward under the punching and stretching of the punch 202 and enters the first gap 3022. At this time, the punch 202 also gradually abuts against the first lifting surface 3031 of the lifting member 303. It can be understood that in this process, most of the outer peripheral area of ​​the blank 40 is still between the first contact surface 301 and the second contact surface 2032. Only the middle inner wall and the area near the inner wall that is pressed by the punch 202 begin to bend downward.

[0064] The main body plate 201 continues to move downward to the mold base 30, causing the punch 202 to drive the lifting member 303 to move downward in the forming cavity 302. At the same time, the blank 40 continues to be stretched, and the remaining part of the blank 40 continues to bend and deform until the blank 40 completely enters the first gap 3022 to form a cylindrical product 50 (see...). Figures 8-11 The forming operation is achieved by compressing the first elastic element 304, which in turn compresses the main body plate 201 and the punch 202 of the upper mold base 20. The second elastic element 204 is also gradually compressed, and the depth of the punch 202 into the forming cavity 302 gradually increases. The remaining part of the blank 40 is also gradually separated from the first contact surface 301 and the second contact surface 2032 under the action of the punch 202 and gradually enters the first gap 3022. It is understandable that during the process of the blank 40 completely separating from the first contact surface 301 and the second contact surface 2032, the stripper plate 203 will have slight up and down movement. After the blank 40 is completely separated from the first contact surface 301 and the second contact surface 2032, the first contact surface 301 and the second contact surface 2032 come into contact.

[0065] For the process flow of the above molding process, please refer to [link / reference]. Figure 12 .

[0066] Furthermore, after step S3), the formed cylindrical product 50 needs to be removed. The removal method includes: driving the upper mold base 20 to move upward, so that the punch 202 is disengaged from the forming cavity 302, and driving the lifting member 303 to rise, thereby lifting the cylindrical product 50 located on the upper part of the lifting member 303 to the outside of the forming cavity 302 and removing it.

[0067] During the specific removal operation, the upper mold base 20 moves upward, causing the punch 202 to gradually move upward. At this time, the first elastic element 304 gradually extends and drives the lifting element 303 to rise, thereby pressing against the cylindrical product 50 in the upper first gap 3022 and gradually rising. After the punch 202 completely leaves the forming cavity 302 and is located a certain distance above it (at this time, the second elastic element 204 also returns to its initial extended state), the lifting element 303 can completely eject the cylindrical product 50 out of the forming cavity 302 or at least partially eject it from the forming cavity 302. At this time, the cylindrical product 50 can be removed.

[0068] To further ensure the molding effect, in step S2), after the second contact surface 2032 of the stripper plate 203 comes into contact with the blank 40, the axis of the punch 202 and the axis of the molding cavity 302 can be made to coincide with the axis of the blank 40, that is, the axes of the three are coincident.

[0069] In some embodiments, both the punch 202 and the forming cavity 302 are cylindrical, the outer diameter of the blank 40 is larger than the diameter of the forming cavity 302, and the inner diameter of the blank 40 is smaller than the outer diameter of the punch 202, so as to better ensure the forming effect; this structure is more conducive to obtaining cylindrical products with uniform wall thickness.

[0070] Furthermore, the lifting member 303 is cylindrical, with an outer diameter larger than that of the punch 202, and an outer diameter not larger than that of the forming cavity 302, so as to better eject the formed product during part removal and achieve smooth part removal.

[0071] It should be noted that the shape of the forming cavity 302 is not limited to a cylinder, but can also be a square or other shapes. Similarly, the shape of the punch 202 is not limited to a cylinder, but can also be a square or other shapes. The shape of the punch 202 can be adapted to the shape of the forming cavity 302.

[0072] By stamping and stretching the ring-shaped sheet material using the aforementioned mold, a seamless cylindrical product with through holes can be obtained in one step. Furthermore, this formed product has no flange edge, eliminating the need for subsequent flange edge removal. The entire process is simpler, greatly improving processing efficiency. At the same time, it also enhances the processing precision of the formed product, resulting in better finished product quality.

[0073] The cylindrical products obtained through the above process are directly formed by stamping and stretching without welding, which improves the structural strength and precision of the products. The entire manufacturing process is easy to control, with fewer process steps and no need to switch molds or punches multiple times, which can better ensure product precision and is also more conducive to ensuring the uniformity of product wall thickness.

[0074] The entire mold equipment has low cost and strong versatility. It can process seamless pipes of various lengths using the same mold equipment and is suitable for the preparation of pipes of various materials. The mold can also be used as part of a complex mold to make more complex products, which is something that existing molds cannot achieve. It is not only suitable for the preparation of standard parts, but also for the preparation of various types of non-standard parts.

[0075] The above process has fewer limitations on the thickness of the blank, allowing for the processing of thinner blanks to produce products with even thinner walls, down to as thin as 0.04 mm. This process is particularly suitable for the fabrication of seamless pipes.

[0076] All the above-mentioned optional technical solutions can be combined in any way to form the optional embodiments of this application. That is, any number of embodiments can be combined to meet the needs of different application scenarios. All of them are within the protection scope of this application and will not be described in detail here.

[0077] It should be noted that the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A stamping die, characterized in that: include, The lower mold base has a first contact surface on its upper part, and a molding cavity is formed on the first contact surface. A lifting member is slidably connected in the molding cavity, and the upper part of the lifting member forms a first lifting surface. The upper mold base includes a main body plate, a punch connected to the main body plate, a stripper plate movably connected to the lower part of the main body plate, a sliding cavity formed on the stripper plate, the punch being slidably connected in the sliding cavity and extending into the forming cavity, and a second contact surface formed on the lower part of the stripper plate, with a blank placed between the second contact surface and the first contact surface. When the stamping die is in the stamping state, the punch extends through the sliding cavity and into the forming cavity and is used to abut against the first lifting surface of the lifting member. A first gap is formed between the outer wall of the punch and the inner wall of the forming cavity. The abutting surface of the punch when it abuts against the first lifting surface is located inside the first lifting surface.

2. The stamping die according to claim 1, characterized in that: The end of the lifting member away from the first lifting surface is connected to the bottom surface of the forming cavity through a first elastic member, and the main body plate and the stripping plate are connected through a second elastic member.

3. The stamping die according to claim 2, characterized in that: The punch is provided with the second elastic element on both sides. One end of each second elastic element is connected to the main body plate, and the other end is connected to the stripper plate.

4. The stamping die according to claim 3, characterized in that: The second elastic elements on both sides of the punch are arranged symmetrically.

5. The stamping die according to claim 1, characterized in that: The end of the molding cavity near the first contact surface is connected to the first contact surface through a first transition portion, which is arc-shaped.

6. The stamping die according to claim 1, characterized in that: The end of the punch facing the first lifting surface is provided with a rounded corner.

7. The stamping die according to claim 1, characterized in that: The axes of the sliding cavity and the forming cavity coincide.

8. The stamping die according to claim 1, characterized in that: Both the first contact surface and the second contact surface are planar.

9. The stamping die according to claim 1, characterized in that: The blank is a ring-shaped plate, and both the punch and the forming cavity are cylindrical. The outer diameter of the blank is larger than the diameter of the forming cavity, and the inner diameter of the blank is smaller than the outer diameter of the punch.

10. The stamping die according to claim 9, characterized in that: The lifting member is cylindrical, and its outer diameter is larger than that of the punch, but not larger than the diameter of the forming cavity.

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