Sheet metal stamping die

Abstract

The invention relates to the technical field of dies, in particular to a metal plate stamping die which comprises an upper die body, a middle die body and a lower die body, the middle die body is fixedly arranged, the upper die body and the lower die body can move in the direction close to the middle die body, the upper die body and the middle die body are jointly used for the stamping process, and the middle die body and the lower die body are jointly used for the pressure maintaining process. The metal plate stamping die further comprises a heating assembly, a containing space is formed in the lower die, the heating assembly is located in the containing space, and the heating assembly is at least used for maintaining the pressure maintaining temperature. And heat energy is wasted due to the fact that heating needs to be carried out to a high temperature in advance.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a metal plate stamping mold. Background Art

[0002] Stamping is a production technology that uses the power of conventional or special stamping equipment to directly subject the sheet metal to deformation force in the die and deform it, so as to obtain a product sheet metal of a certain shape, size and performance. Sheet metal, die and equipment are the three elements of stamping. According to the stamping temperature, it is divided into hot stamping and cold stamping. The former is suitable for sheet metal processing with high deformation resistance and poor plasticity; the latter is carried out at room temperature and is a commonly used stamping method for thin plates.

[0003] Hot stamping forming technology uses the principle of metal thermoplastic forming to shape hot metal through hot stamping hardware dies. It can achieve quenching heat treatment of sheet metal during forming, improve the forming performance of the material, and greatly expand the application scope of high-strength and ultra-high-strength steel in automotive parts.

[0004] The main principle of this technology is to first heat the steel plate to above the recrystallization temperature to make it completely solidified, and then transfer the red-hot steel plate to the mold for forming. The mold is equipped with a cooling device to quench the steel plate while forming, so that the tensile strength of the final formed part can reach more than 1500MPa.

[0005] When stamping elastic parts, such as wave springs, it is generally necessary to hold the pressure after stamping due to the rebound characteristics of elastic materials. In hot stamping, the blank is first heated to a certain temperature, and then a stamping machine is used to stamp and hold the pressure in the corresponding mold to obtain the desired shape and realize the phase change of the metal material at the same time.

[0006] First, when processing elastic materials, in order to reduce the impact of temperature reduction during stamping and holding, the elastic materials need to be preheated to a temperature far exceeding that required for stamping. Heating the elastic materials to too high a temperature will have the following effects:

[0007] ①Higher temperature will cause the stamping die to heat up faster, and the die will be deformed due to heat;

[0008] ②Higher temperatures will cause the stamping die to continuously expand due to heat and shrink due to cooling during operation, resulting in severe deformation of the die, thus affecting the processing accuracy;

[0009] ③ The temperature of the elastic material will continue to decrease during the pressure holding process, which often takes a long time and affects production efficiency;

[0010] ④ The elastic material is heated to an excessively high temperature, and the temperature continues to drop during the stamping and holding processes, and most of the heat used to heat the elastic material is dissipated and wasted.

[0011] At the same time, since the actual pressure required in the pressure holding process is much lower than that in the stamping process, the pressure between the dies needs to be reduced to the pressure required for pressure holding after stamping is completed. However, the existing preparation process cannot determine when to enter the pressure holding state from the stamping state, and can only maintain pressure at a higher pressure, which puts the pressure holding process equipment under high load and affects the service life of the equipment. Summary of the invention

[0012] In view of the deficiencies in the prior art, an object of the present invention is to provide a metal sheet stamping die.

[0013] To achieve the above object, the technical solution adopted by the present invention includes:

[0014] A metal sheet stamping die, comprising:

[0015] An upper mold, a middle mold and a lower mold, wherein the middle mold is fixedly arranged, and the upper mold and the lower mold can both move toward the direction close to the middle mold, the upper mold and the middle mold are used together in the stamping process, and the middle mold and the lower mold are used together in the pressure holding process;

[0016] It also includes a heating component. A receiving space is provided in the lower mold. The heating component is located in the receiving space. The heating component is at least used to maintain the holding temperature.

[0017] In the present invention, the heating component is located in the accommodating space, which can prevent the heating component from being squeezed, thereby protecting the heating component.

[0018] Preferably, the middle mold is provided with a plurality of first pressure-holding positions, and the lower mold is provided with a plurality of second pressure-holding positions, the first pressure-holding positions are equal in number and correspond one to one, and the corresponding first pressure-holding positions and second pressure-holding positions are used together to hold pressure on a workpiece.

[0019] Preferably, the number of the first pressure-maintaining positions is at least two, and a plurality of the first pressure-maintaining positions are evenly distributed on the bottom surface of the middle mold.

[0020] In the present invention, a plurality of first pressure-holding positions can hold pressure on a plurality of stamped materials, thereby improving the production efficiency of the pressure-holding process.

[0021] Preferably, a heat insulation component is provided in the lower mold, and the heat insulation component is at least used to prevent the heat on the lower mold from being transferred in a direction away from the middle mold.

[0022] In the present invention, the thermal insulation component can increase the concentration of heat in the second holding position, which is beneficial to maintaining the holding temperature of the holding process; at the same time, the thermal insulation component can guide the heat to be transferred to the middle mold, and guide part of the originally dissipated heat to be transferred to the middle mold, thereby achieving the effect of heating the middle mold, thereby realizing the secondary utilization of heat energy, which is beneficial to improving the utilization rate of heat energy.

[0023] In the prior art, since the stamping and pressure-holding processes are handled by the same mold, the mold needs to be able to withstand a large stamping pressure, and the thermal insulation components are easily damaged in the mold. Therefore, it is not suitable to install the thermal insulation components in the mold; in the present application, the stamping process and the pressure-holding process are carried out separately, and the pressure received during the pressure-holding process is much smaller than the pressure received during the stamping process. The lower mold does not need to withstand the impact of the stamping process, and the thermal insulation components will never be damaged.

[0024] Preferably, a receiving space is provided on the lower mold below each of the second pressure-holding positions, and a heat insulation component is provided in each of the receiving spaces.

[0025] Preferably, for any of the accommodating spaces, the thermal insulation assembly is located below the corresponding heating assembly.

[0026] In the present invention, the heating component can heat each second pressure-maintaining position, and the heat-insulating component is conducive to concentrating heat to the second pressure-maintaining position, reducing useless diffusion of heat energy and improving the utilization rate of heat energy.

[0027] Preferably, the heating component has an electric heating structure.

[0028] In the present invention, the electric heating method is easy to control the heating process of the heating component, which is beneficial to accurately control the pressure holding temperature.

[0029] Preferably, a supplementary heating component is provided on the middle mold, and the supplementary heating component is at least used to heat the middle mold.

[0030] In the present invention, the supplementary heating component can supplement the heating of the middle mold and maintain the temperature of the middle mold, thereby reducing the temperature drop of the stamped material during the stamping process and reducing the impact of the temperature drop during the stamping process, which is beneficial to reducing the temperature to which the stamping material needs to be heated.

[0031] Preferably, a plurality of heat pipes are arranged in the middle mold; for any of the heat pipes, one end thereof is close to the bottom surface of the middle mold, and the other end is close to the top surface of the middle mold.

[0032] In the present invention, the heat pipe can accelerate the transfer of heat from the bottom surface of the middle mold to the top surface of the middle mold, which is beneficial to reducing the dissipation of heat during the heat transfer process.

[0033] Compared with the prior art, the advantages of the present invention include:

[0034] (1) The present invention performs the stamping process and the pressure holding process separately, and there is no need to consider the influence of the temperature reduction of the material during the stamping process and the pressure holding process, so there is no need to heat the material temperature to a temperature higher than that required for stamping, which is beneficial to reducing the consumption of heat energy;

[0035] (2) The metal sheet stamping die provided by the present invention does not need to heat the material to an excessively high temperature, thereby preventing the stamping die from being subjected to a high temperature, reducing the amount of thermal deformation of the upper die, and further preventing the upper die from being deformed due to heat;

[0036] (3) The metal sheet stamping die provided by the present invention can simultaneously perform pressure holding treatment on multiple stamped forming materials, thereby improving the production efficiency of the pressure holding process;

[0037] (4) The present invention provides a metal sheet stamping die, in which the heat energy emitted during the pressure holding process can be transferred to the middle die, thereby heating the upper die, realizing the secondary utilization of energy, and thus improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of an integral die of a metal sheet stamping die in the present invention.

[0040] Figure 2 It is a cross-sectional view of the lower die structure of a metal sheet stamping die in the present invention.

[0041] Figure 3 It is a cross-sectional view of the lower die structure of a metal sheet stamping die in the present invention.

[0042] Figure 4 It is a schematic diagram of the structure of a lower die of a metal sheet stamping die in the present invention.

[0043] Figure 5 It is an overall schematic diagram of a metal sheet stamping die in the present invention.

[0044] Reference numerals:

[0045] 11. Upper mold; 12. Middle mold; 13. Lower mold; 14. Lower pressure head; 15. Forming groove; 16. Heat supply pipe; 17. Liquid inlet; 18. Liquid outlet; 19. First pressure holding position; 21. First pressure holding mold; 22. Second pressure holding position; 23. Second pressure holding mold; 24. Accommodating space; 25. Heat insulation sheet; 26. Heating wire; 27. Base; 28. Sliding rod; 29. ​​Upper hydraulic rod; 31. Lower hydraulic rod; 32. Guide rod; 33. Heat pipe. DETAILED DESCRIPTION

[0046] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0047] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "an" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0049] In the description of the present application, the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application 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 application. In addition, when positional terms such as both sides, outside, up and down are used, it should be understood that they are only used to facilitate understanding and description, considering that the structure may be facing other positions.

[0050] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The embodiment of the present invention is intended to introduce and illustrate the structural composition of a metal sheet stamping die and the matching relationship between the various components. Unless otherwise specified, the dimensions, materials and manufacturing processes suitable for each component in AAAA in the embodiment of the present invention can be selected according to specific circumstances and are not specifically limited or explained herein.

[0052] Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. For those skilled in the art, the present invention can be fully understood without the description of these details.

[0053] Example 1

[0054] See also Figure 1 to Figure 5 A metal sheet stamping die comprises an upper die 11, a middle die 12 and a lower die 13. The upper die 11, the middle die 12 and the lower die 13 are arranged vertically in sequence, the middle die 12 is fixedly arranged, and the upper die 11 and the lower die 13 can move vertically. The upper die 11 and the middle die 12 are used to stamp elastic materials to obtain rough workpieces, and the middle die 12 and the lower die 13 are used to maintain pressure on the rough workpieces.

[0055] A lower punch 14 is installed on the upper mold 11, and a forming groove 15 matching the lower punch 14 is provided on the top surface of the middle mold 12; during the stamping process, the upper mold 11 moves downward, and the lower punch 14 stamps the elastic material. The elastic material is stamped to obtain a rough workpiece under the joint action of the lower punch 14 and the forming groove 15.

[0056] The middle mold 12 is provided with a heating component, which includes a heating pipe 16. The heating pipe 16 is evenly distributed in the middle mold 12. The liquid inlet 17 and the liquid outlet 18 of the heating pipe 16 both extend out of the surface of the middle mold 12 and are connected to the external heating unit. The external heating unit injects heating oil into the heating pipe 16 through the liquid inlet 17, and then discharges the heating oil from the heating pipe 16 through the liquid outlet 18, which can heat the middle mold 12, thereby maintaining the temperature of the middle mold 12; at the same time, the heating oil flows in the heating pipe 16, which is conducive to improving the uniformity of the temperature at various locations in the middle mold 12.

[0057] Furthermore, by controlling the injection speed of the heating oil, the heating speed of the centering mold 12 can be controlled.

[0058] In addition, when the temperature of the middle mold 12 is too high, the temperature of the middle mold 12 can be reduced in time by injecting low-temperature heating oil into the heat supplement pipe 16 .

[0059] A plurality of heat pipes 33 are provided in the middle mold 12, and the plurality of heat pipes 33 are evenly arranged in the middle of the heat supply pipe 16. The plurality of heat pipes 16 can evenly diffuse the heat emitted by the heat supply pipe 16 to various positions of the middle mold 12, so that the temperature of the middle mold 12 can be better controlled through the heat supply pipe 16.

[0060] A plurality of first pressure-holding positions 19 are provided on the bottom surface of the middle mold 12, and a first pressure-holding mold 21 is provided in each first pressure-holding position 19. The plurality of first pressure-holding molds 21 are evenly distributed on the bottom surface of the middle mold 12. A plurality of second pressure-holding positions 22 are provided on the lower mold 13, and a second pressure-holding mold 23 is provided in each second pressure-holding position 22. Each second pressure-holding mold 23 corresponds to a position of a first pressure-holding mold 21. During pressure holding, the lower mold 13 moves upward and closes with the middle mold 12. At this time, each second pressure-holding mold 23 and the corresponding first pressure-holding mold 21 jointly extrude a rough workpiece.

[0061] The plurality of first pressure-maintaining positions 19 can improve the pressure-maintaining efficiency, and the uniform distribution is conducive to the uniform transfer of heat from the lower mold 13 to the middle mold 12 .

[0062] A plurality of accommodating spaces 24 are provided in the lower mold 13, and an accommodating space 24 is provided below each second pressure holding position 22. A heat insulating sheet 25 and a heating wire 26 are installed in each accommodating space 24. In any accommodating space 24, the heating wire 26 is closely attached to the top wall of the accommodating space 24, and the heat insulating sheet 25 is closely attached to the heating wire 26 and is located below the heating wire 26 to prevent the heat emitted by the heating wire 26 from diffusing downward.

[0063] For example, a stamping device applicable to the metal sheet stamping die in this embodiment includes a base 27, on which a vertical slide bar 28 is provided. The middle die 12 is fixedly mounted on the slide bar 28, and an upper hydraulic rod 29 is provided on the top of the slide bar 28, which is connected to the upper die 11, and is used to drive the upper die 11 to move vertically downward and close to the middle die 12, so as to achieve stamping processing of the elastic material; a lower hydraulic rod 31 is also provided on the slide bar 28, and the lower hydraulic rod is connected to the lower die 13, and the lower hydraulic rod 31 is used to drive the lower die 13 to move vertically close to the middle die 12, so as to achieve pressure holding processing of the rough workpiece.

[0064] A guide rod 32 is also provided on the lower mold 13, one end of the guide rod 32 is fixedly connected to the top of the lower mold 13, and the other end passes through the middle mold 12. The guide rod 32 can slide up and down on the side of the middle mold 12 and drive the lower mold 13 to move up and down smoothly, making the movement process of the lower mold 13 smoother and improving the mold closing accuracy of the middle mold 12 and the lower mold 13.

[0065] When stamping, the heating oil is injected into the heating pipe 16 through the liquid inlet 17 by the external heating unit, and the first pressure holding position 19 is heated, so that the temperature of the middle mold 12 can be raised to the temperature required for stamping; the elastic material to be stamped is placed on the forming groove 15 by a manual or mechanical arm, and the upper hydraulic rod 29 pushes the mold lower pressure head 14 set under the upper mold 11 to move downward and approach the forming groove 15. When the mold lower pressure head 14 contacts the material, it continues to press the material into the forming groove 15, thereby realizing the stamping process of the material to obtain a rough workpiece. In other embodiments, the obtained rough workpiece can also be placed in an insulation box to further reduce energy dissipation.

[0066] When pressure holding is performed, the rough workpiece is placed on one of the second pressure holding positions 22 manually or by a mechanical arm, and the external heating unit heats the temperature of the heating wire 26. The heat of the heating wire 26 is diffused and transferred in the accommodating space 24, thereby achieving uniform heating of the lower mold 13 and maintaining the temperature of the pressure-holding material; the lower hydraulic rod 31 is started, and the lower hydraulic rod 31 drives the lower mold 13 to move upward, and slides in the middle mold 12 through the guide rod 32, so that the lower mold 13 drives the second pressure holding position 22 to approach the first pressure holding position 19, and the second pressure holding position 22 and the first pressure holding position 19 are closed to achieve the effect of pressure holding treatment of the stamping material.

[0067] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A metal sheet stamping die, characterized in that: The invention comprises an upper mold (11), a middle mold (12) and a lower mold (13), wherein the middle mold (12) is fixedly arranged, and the upper mold (11) and the lower mold (13) are both capable of moving in a direction close to the middle mold (12); the upper mold (11) and the middle mold (12) are used together in a stamping process, and the middle mold (12) and the lower mold (13) are used together in a pressure holding process; It also includes a heating component. A receiving space (24) is provided in the lower mold (13). The heating component is located in the receiving space (24). The heating component is at least used to maintain the holding temperature.

2. A metal sheet stamping die according to claim 1, characterized in that: The middle mold (12) is provided with a plurality of first pressure-holding positions (19), and the lower mold (13) is provided with a plurality of second pressure-holding positions (22), the first pressure-holding positions (19) and the second pressure-holding positions (22) are equal in number and correspond one to one, and the corresponding first pressure-holding positions (19) and second pressure-holding positions (22) are used together to hold pressure on a workpiece.

3. A metal sheet stamping die according to claim 2, characterized in that: The number of the first pressure-maintaining positions (19) is at least two, and a plurality of the first pressure-maintaining positions (19) are evenly distributed on the bottom surface of the middle mold (12).

4. The metal sheet stamping die according to claim 2, characterized in that: A heat insulation component is arranged in the lower mold (13), and the heat insulation component is at least used to prevent the heat on the lower mold (13) from being transferred in a direction away from the middle mold (12).

5. A metal sheet stamping die according to claim 4, characterized in that: A receiving space (24) is provided on the lower mold (13) below each of the second pressure-maintaining positions (22), and a heat-insulating component is provided in each of the receiving spaces (24).

6. The metal sheet stamping die according to claim 5, characterized in that: For any of the accommodating spaces (24), the heat insulation component is located below the corresponding heating component.

7. The metal sheet stamping die according to claim 1, characterized in that: The heating component has an electric heating structure.

8. The metal sheet stamping die according to claim 1, characterized in that: The middle mold (12) is provided with a supplementary heating component, and the supplementary heating component is at least used to heat the middle mold (12).

9. The metal sheet stamping die according to claim 1, characterized in that: A plurality of heat pipes (33) are arranged in the middle mold (12); for any of the heat pipes (33), one end is close to the bottom surface of the middle mold (12), and the other end is close to the top surface of the middle mold (12).

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