Punch forming die and forming process

Abstract

The punch forming die 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, a forming cavity is formed in the first contact face, a jacking piece is connected into 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. The invention further discloses a forming process. Product processing efficiency and product quality can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of stamping and forming, in particular to a stamping and forming die and a forming process. Background Art

[0002] For some tubular parts such as pipes and sleeves, the following two methods can be used for preparation. One is to bend the plate and then weld it into shape. This method is affected by the welding process and has certain requirements for the thickness of the plate. The thickness of the plate must be at least greater than 0.15mm. This also makes it impossible to prepare tubular parts with thinner walls. In addition, this preparation method has low production efficiency and the finished product is prone to certain welding defects. Another method is to use a tube drawing process, such as Figure 1 As shown, it generally needs to be processed through multiple processes such as stretching, punching, and flanging. The parts made by this tube drawing process usually have a flange edge 10, and finally the flange edge 10 needs to be cut off separately. The whole process requires the replacement of a variety of different mold punches and workstations to achieve different processes. The whole process is complicated and cannot well guarantee the uniformity of the wall thickness of the final product. Therefore, the existing preparation device and preparation method cannot efficiently obtain high-quality molded products and cannot meet production needs. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to improve the processing efficiency and processing quality of tubular products in the prior art.

[0004] In order to solve the above technical problems, the present invention provides a stamping die, comprising:

[0005] A lower die seat, wherein the upper portion of the lower die seat has a first contact surface, a molding cavity is formed on the first contact surface, a lifting member is slidably connected in the molding cavity, and the upper portion of the lifting member forms a first lifting surface;

[0006] An upper die base, the upper die base comprising a main body plate, a punch is connected to the main body plate, a stripper plate is movably connected to the lower part of the main body plate, a sliding cavity is formed on the stripper plate, the punch is slidably connected to the sliding cavity and can extend into the forming cavity, a second contact surface is formed at the lower part of the stripper plate, and a blank is placed between the second contact surface and the first contact surface;

[0007] Among them, when the stamping mold is in a stamping state, the punch extends through the sliding cavity and extends 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 abutment surface of the punch when abutting against the first lifting surface is located inside the first lifting surface.

[0008] In one embodiment of the present invention, one end of the lifting member away from the first lifting surface is connected to the bottom surface of the molding cavity through a first elastic member, and the main plate and the stripping plate are connected through a second elastic member.

[0009] In one embodiment of the present invention, the second elastic member is disposed on both sides of the punch, and one end of each of the second elastic members is connected to the main plate, and the other end is connected to the stripping plate.

[0010] In one embodiment of the present invention, one end of the molding cavity close to the first contact surface is connected to the first contact surface through a first transition portion, and the first transition portion is arc-shaped.

[0011] In one embodiment of the present invention, the axes of the sliding cavity and the forming cavity coincide with each other.

[0012] In one embodiment of the present invention, both the first contact surface and the second contact surface are planes.

[0013] The present invention also discloses a molding process, which uses any of the above-mentioned stamping molds to perform molding, including:

[0014] Step S1), placing a blank on a first contact surface of a lower die seat, wherein the blank is an annular plate, so that the blank is located directly above the forming cavity;

[0015] Step S2), driving the upper die base to move toward the lower die base until the second contact surface of the stripper plate contacts the blank;

[0016] Step S3), driving the main plate to move toward the lower die base, so that the punch extends from the sliding cavity of the stripper plate and abuts against the blank to gradually enter the forming cavity, and the middle part of the blank is gradually bent and deformed downward under the punching and stretching and enters the first gap, at which time the punch abuts against the first lifting surface of the lifting member;

[0017] The main body plate is continuously driven to move toward the lower die base, so that the punch drives the lifting member to move downward in the forming cavity, and the blank is continuously stretched until the blank completely enters the first gap to form a tubular product.

[0018] In one embodiment of the present invention, after step S3), the cylindrical product needs to be taken out, and the taking-out method includes: driving the upper die seat to move upward so that the punch is disengaged from the molding cavity, and driving the lifting member to rise, thereby lifting the cylindrical product located on the upper part of the lifting member to the outside of the molding cavity and removing it.

[0019] In one embodiment of the present invention, in the step S2), after the second contact surface of the stripper plate contacts the blank, the axis of the punch and the axis of the forming cavity coincide with the axis of the blank.

[0020] In one embodiment of the present invention, 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.

[0021] In one embodiment of the present invention, 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.

[0022] The above technical solution of the present invention has the following advantages compared with the prior art:

[0023] The stamping forming die and forming process described in the present invention greatly improve product processing efficiency and reduce production costs, while also allowing the formed products to have better processing accuracy and better finished product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0025] Figure 1 It is a flow chart of the tube drawing process in the prior art;

[0026] Figure 2 It is a structural schematic diagram of the upper die seat of the stamping die in the present invention;

[0027] Figure 3 It is a structural schematic diagram of the lower die base of the stamping die in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the stamping mold in the present invention in an open mold state (open state);

[0029] Figure 5 yes Figure 4 A front view of the structure;

[0030] Figure 6 yes Figure 5 a cross-sectional view of the structure;

[0031] Figure 7 yes Figure 6 A partial enlarged schematic diagram of the M in the middle;

[0032] Figure 8 It is a structural schematic diagram of the stamping forming die in the present invention in a mold closing stamping state;

[0033] Fig. 9 yes Figure 8 a cross-sectional view of the structure;

[0034] Fig.10 yes Fig. 9 A local enlarged schematic diagram of the N position in the middle;

[0035] Fig.11 It is a schematic diagram of the position of the punch and the cylindrical product during forming;

[0036] Fig.12 is a flow chart of the molding process of the present invention;

[0037] Description of the Figures in the Specification:

[0038] 10. Flange edge;

[0039] 20, upper die seat; 201, main body plate; 202, punch; 2021, rounded corners; 203, stripping plate; 2031, sliding cavity; 2032, second contact surface; 204, second elastic member;

[0040] 30, lower die seat; 301, first contact surface; 302, molding cavity; 3021, first transition portion; 3022, first gap; 303, lifting member; 3031, first lifting surface; 304, first elastic member;

[0041] 40. Blank;

[0042] 50. Cylindrical products. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use.

[0044] In the description of the present invention, it should be understood that the terms "vertical", "upper", "lower", "top", "side", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Example

[0047] See also Figure 2-Figure 11 , this embodiment discloses a stamping die, including a lower die base 30 and an upper die base 20;

[0048] like Figure 3 As shown, the upper part of the lower mold base 30 has a first contact surface 301, a molding cavity 302 is formed on the first contact surface 301, a lifting member 303 is slidably connected in the molding cavity 302, and the upper part of the lifting member 303 forms a first lifting surface 3031 for lifting the molded product;

[0049] like Figure 2 As shown, the upper die holder 20 includes a main body plate 201, on which a punch 202 for punching 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 to the sliding cavity 2031 and can extend into the forming cavity 302 during the forming process, and a second contact surface 2032 is formed at the lower part of the stripper plate 203, and the blank 40 is placed between the second contact surface 2032 and the first contact surface 301;

[0050] Among them, Figure 8-Figure 10As shown, when the stamping die is in a stamping state, the punch 202 extends through the sliding cavity 2031 and extends into the molding cavity 302 and is used to abut against the first lifting surface 3031 of the lifting member 303, and a first gap 3022 is formed between the outer wall of the punch 202 and the inner wall of the molding cavity 302; the abutting surface when the punch 202 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 the punch 202 and the lifting member 303 are both 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 molded product to avoid the product falling, and it is also convenient for the subsequent removal of the product.

[0051] The first gap 3022 is a receiving cavity of the final product, and the first gap 3022 is substantially equal to the wall thickness of the final product.

[0052] The mold of the above structure can directly punch and stretch the plate-shaped / sheet-shaped annular blank 40 into a seamless cylindrical product 50, forming it in one step, with high product precision, greatly improving production efficiency and reducing production costs.

[0053] It can be understood that the above-mentioned "cylindrical product" can be understood as a product with a cavity.

[0054] In some embodiments, Figure 6 As shown, one end of the lifting member 303 away from the first lifting surface 3031 is connected to the bottom surface of the molding cavity 302 through the first elastic member 304 , and the main plate 201 and the stripping plate 203 are connected through the second elastic member 204 .

[0055] 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 to facilitate product removal;

[0056] The stripping 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 be extended or retracted. For example, in the stamping state, the punch 202 extends and gradually extends into the forming cavity 302 .

[0057] The first elastic member 304 and the second elastic member 204 may be elastic elements such as springs, deformable metal plates, rubber members, etc.

[0058] Furthermore, second elastic members 204 are provided on both sides of the punch 202, and one end of each second elastic member 204 is connected to the main plate 201, and the other end is connected to the stripping plate 203, so as to better ensure the stability of stamping.

[0059] Furthermore, the second elastic members 204 on both sides of the punch 202 are arranged symmetrically to better ensure the stability of the movement of the punch 202 .

[0060] In addition, more than two second elastic members 204 may be disposed around the punch 202 . In this case, the second elastic members 204 may be evenly distributed circumferentially around the punch 202 to further ensure the stability of the stamping.

[0061] In some embodiments, Figure 2 and Figure 7 As shown, one end of the forming cavity 302 close to the first contact surface 301 is connected to the first contact surface 301 through a first transition portion 3021. The first transition portion 3021 is arc-shaped and can be processed by a rounding process. Through the setting of the first transition portion 3021, the blank 40 can enter the forming cavity 302 more smoothly under the stamping of the punch 202, and can also protect the blank 40 and prevent the blank 40 from being scratched.

[0062] Furthermore, if Fig.10 and Fig.11 As shown, a chamfer 2021 may also be provided at one end of the punch 202 facing the first lifting surface 3031 to facilitate stamping and stretching of the blank 40 , and to effectively prevent surface scratches on the blank 40 during the forming process, thereby improving the surface quality of the product.

[0063] In some embodiments, the axes of the sliding cavity 2031 and the molding cavity 302 coincide with each other to better ensure the product molding effect.

[0064] In some embodiments, the first contact surface 301 and the second contact surface 2032 are both planes, so as to increase the contact area with the blank 40 and ensure the forming effect.

[0065] The following is a detailed description of the molding process using the stamping mold to perform molding, using a mold equipped with the first elastic member 304 and the second elastic member 204. The process includes the following steps:

[0066] Step S1), such as Figure 8-Figure 7 As shown, the blank 40 is placed on the first contact surface 301 of the lower die holder 30. The blank 40 is an annular plate, so that the blank 40 is located directly above the molding cavity 302. For example, the axis of the blank 40 coincides or substantially coincides with the axis of the molding cavity 302.

[0067] Step S2), driving the upper die holder 20 to move toward the lower die holder 30 until the second contact surface 2032 of the stripper plate 203 contacts the blank 40, at which time the blank 40 is clamped between the first contact surface 301 and the second contact surface 2032, achieving preliminary mold closing;

[0068] Step S3), driving the main plate 201 to move toward the lower die base 30, so that the punch 202 extends from the sliding cavity 2031 of the stripping plate 203 and abuts against the blank 40 and gradually enters the forming cavity 302, and the middle part of the blank 40 gradually bends and deforms downward under the stamping and stretching of the punch 202 and enters the first gap 3022, at which 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 peripheral area of ​​the blank 40 is still between the first contact surface 301 and the second contact surface 2032, and only the middle inner wall and the area pressed by the punch 202 near the inner wall begin to bend downward;

[0069] The main plate 201 is continuously driven to move toward the lower die holder 30, so that the punch 202 drives the lifting member 303 to move downward in the forming cavity 302, and the blank 40 is continuously stretched, and the remaining portion of the blank 40 is continuously bent and deformed until the blank 40 completely enters the first gap 3022 to form a cylindrical product 50 (see Figure 8-Figure 11 ), and the forming operation is realized; in this process, the first elastic member 304 is gradually compressed, the main body plate 201 of the upper die seat 20 and the punch 202 move downward as a whole, the second elastic member 204 is also gradually compressed, and the depth of the punch 202 extending into the forming cavity 302 gradually deepens, and the rest of the blank 40 is also driven by the punch 202 to gradually separate from the first contact surface 301 and the second contact surface 2032 and gradually enter the first gap 3022. It can be understood that in the process of the blank 40 completely separating from the first contact surface 301 and the second contact surface 2032, the stripping plate 203 will have a slight up and down floating, and 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 are in contact;

[0070] The process flow of the above molding process can be found in Fig.12 .

[0071] Furthermore, after step S3), the formed cylindrical product 50 needs to be taken out, and the taking out method includes: driving the upper die holder 20 to move upward so that the punch 202 is separated from the forming cavity 302, and driving the lifting member 303 to rise, and the cylindrical product 50 located on the upper part of the lifting member 303 is lifted to the outside of the forming cavity 302 and taken out;

[0072] When performing the removal operation, the upper die seat 20 moves upward, causing the punch 202 to gradually move upward. At this time, the first elastic member 304 gradually extends and drives the lifting member 303 to rise, thereby supporting the cylindrical product 50 in the upper first gap 3022 to gradually rise. After the punch 202 is completely separated from the molding cavity 302 and is located a certain distance above it (at this time, the second elastic member 204 also returns to its initial extension state), the lifting member 303 can completely push the cylindrical product 50 out of the molding cavity 302 or at least partially push it out of the molding cavity 302, and the cylindrical product 50 can be taken away at this time.

[0073] To further ensure the forming effect, in step S2), after the second contact surface 2032 of the stripping plate 203 contacts the blank 40, the axis of the punch 202 and the axis of the forming cavity 302 can coincide with the axis of the blank 40, that is, the axes of the three coincide.

[0074] In some embodiments, the punch 202 and the forming cavity 302 are both 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 a cylindrical product with uniform wall thickness.

[0075] Furthermore, the lifting member 303 is cylindrical, and the outer diameter of the lifting member 303 is larger than the outer diameter of the punch 202, and the outer diameter of the lifting member 303 is not larger than the diameter of the forming cavity 302, so as to better eject the molded product when taking out the product, and realize smooth taking out of the product.

[0076] It should be noted that the shape of the forming cavity 302 is not limited to a cylindrical shape, but may also be a square or other shapes. Similarly, the shape of the punch 202 is not limited to a cylindrical shape, but may also be a square or other shapes. The shape of the punch 202 may be adapted to the shape of the forming cavity 302.

[0077] By stamping and stretching the annular plate blank through the above-mentioned mold, a seamless cylindrical product with a through hole can be obtained in one step, and the molded product has no flange edge, and there is no need to cut the flange edge later. The whole process is simpler and the processing efficiency is greatly improved. At the same time, the processing accuracy of the molded product is also improved, making the quality of the finished product better.

[0078] The cylindrical formed product obtained by the above process is directly formed by stamping and stretching, without welding processing, which improves the structural strength and precision of the product; the whole preparation process is easy to control, with fewer process steps, and does not require multiple switching stations to switch molds or punches, which can better ensure product precision and is more conducive to ensuring the uniformity of product wall thickness;

[0079] The entire mold equipment has low cost and strong versatility. The same mold equipment can be used to process seamless pipes of various lengths and is suitable for the preparation of pipes of various materials. The above mold can also be used as a part of a complex mold to make more complex products, which is also impossible with existing molds. It is not only suitable for the preparation of standard parts, but also for the preparation of various types of non-standard parts.

[0080] The above process has less restriction on the thickness of the blank, and can process thinner blanks to produce products with thinner wall thickness, and the thinnest wall thickness of the product can reach 0.04mm. The above process is particularly suitable for the preparation of seamless pipes.

[0081] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, that is, any multiple embodiments can be combined to meet the needs of different application scenarios. They are all within the protection scope of this application and will not be described one by one here.

[0082] It should be noted that the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A stamping die, characterized in that: include, A lower die seat, wherein the upper portion of the lower die seat has a first contact surface, a molding cavity is formed on the first contact surface, a lifting member is slidably connected in the molding cavity, and the upper portion of the lifting member forms a first lifting surface; An upper die base, the upper die base comprising a main body plate, a punch is connected to the main body plate, a stripper plate is movably connected to the lower part of the main body plate, a sliding cavity is formed on the stripper plate, the punch is slidably connected to the sliding cavity and can extend into the forming cavity, a second contact surface is formed at the lower part of the stripper plate, and a blank is placed between the second contact surface and the first contact surface; Among them, when the stamping mold is in a stamping state, the punch extends through the sliding cavity and extends 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 abutment surface of the punch when abutting against the first lifting surface is located inside the first lifting surface.

2. The stamping die according to claim 1, characterized in that: One end of the lifting member away from the first lifting surface is connected to the bottom surface of the molding 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 second elastic member is disposed on both sides of the punch, and one end of each of the second elastic members is connected to the main body plate, and the other end is connected to the stripping plate.

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

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

6. The stamping die according to claim 1, characterized in that: The first contact surface and the second contact surface are both planes.

7. A molding process, using the stamping mold according to any one of claims 1 to 6 for processing and molding, characterized in that: include, Step S1), placing a blank on a first contact surface of a lower die seat, wherein the blank is an annular plate, so that the blank is located directly above the forming cavity; Step S2), driving the upper die base to move toward the lower die base until the second contact surface of the stripper plate contacts the blank; Step S3), driving the main plate to move toward the lower die base, so that the punch extends from the sliding cavity of the stripper plate and abuts against the blank to gradually enter the forming cavity, and the middle part of the blank is gradually bent and deformed downward under the punching and stretching and enters the first gap, at which time the punch abuts against the first lifting surface of the lifting member; The main body plate is continuously driven to move toward the lower die base, so that the punch drives the lifting member to move downward in the forming cavity, and the blank is continuously stretched until the blank completely enters the first gap to form a tubular product.

8. The molding process according to claim 7, characterized in that: After step S3), the cylindrical product needs to be taken out, and the taking-out method includes: driving the upper die seat to move upward so that the punch is disengaged from the forming cavity, and driving the lifting member to rise, thereby lifting the cylindrical product located on the upper part of the lifting member to the outside of the forming cavity and removing it.

9. The molding process according to claim 7, characterized in that: In the step S2), after the second contact surface of the stripper plate contacts the blank, the axis of the punch and the axis of the forming cavity coincide with the axis of the blank.

10. The molding process according to claim 7, characterized in that: 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.

11. The molding process according to claim 10, characterized in that: 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.

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