A thermoforming mold and equipment

Abstract

The present invention discloses a thermoforming mold and equipment, which are applied to the field of thermoforming technology. The thermoforming mold includes: an upper mold and a lower mold, wherein a cavity for placing a workpiece is formed between the upper mold and the lower mold, and a cavity is provided inside each of the upper mold and the lower mold. In addition, a hollow portion is provided at a target position on one side of the upper mold and the lower mold near the cavity, and the hollow portion is connected to the cavity so that a medium in the cavity can be sprayed onto the workpiece through the hollow portion; a plurality of ejectors, wherein the ejectors are installed in the cavity of the upper mold and / or the lower mold; and a plurality of medium pipelines, which are arranged in the cavity and are used to supply medium to the ejectors, and the pressure of the medium pipelines is adjustable. The thermoforming mold provided by the present invention can improve the forming accuracy and efficiency of the workpiece, effectively eliminate the phenomenon of workpiece quenching deformation, and the weldability of the workpiece after quenching is good, and the workpiece surface is not easily oxidized.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoforming, in particular to a thermoforming die and thermoforming equipment. Background Art

[0002] With the automotive industry's strict control of energy consumption and the rapid growth of new energy vehicles, the demand for vehicle safety and lightweighting is becoming increasingly urgent. Hot-formed steel, due to its ultra-high strength and easy processing, is widely used in automotive structural components. The primary production process for hot-formed steel involves heating the steel sheet to above Ac3, achieving full austenitization of the microstructure, followed by rapid cooling. This improves the overall strength of the steel sheet, achieving a yield strength exceeding 1000 MPa. Furthermore, the demand for hot and cold zoned workpieces is also increasing significantly, especially for battery protection, where the same part requires both high workpiece strength and guaranteed weldability.

[0003] In the related art, the method of quenching by arranging a circulating water channel inside the mold is generally adopted. Its structural form is indirect heat conduction quenching. Its quenching time and temperature are controlled by the water channel, flow rate and water temperature inside the mold, etc., and the indirect heat is conducted to the quenched workpiece for quenching. This method will cause its quenching process to take a long time, a large contact area with the workpiece to be quenched, and will cause certain damage to the galvanized layer on the surface of the workpiece, thereby affecting the performance of the hot and cold partitioned parts. For some R-angles and complex hot-formed parts, the processing and arrangement of the water channel is relatively difficult, the processing cost is high, and the cooling uniformity is difficult to ensure. The weight of the overall mold is large, and the manufacturing cost is relatively high. In addition, there is also a method of processing workpieces by hot and cold partitioning in the related art. However, its mold design is complex. Once formed, it is difficult to adjust the position of its hot and cold partitions. Different transition zones need to be arranged. The design difficulty and processing difficulty are relatively large. The tonnage is large, the cost is high, the maintenance cost and delivery time are long, and the investment cost is also large.

[0004] Therefore, how to improve the precision and efficiency of thermoforming molds is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The purpose of the present invention is to provide a thermoforming die and thermoforming equipment, which can effectively improve the cooling speed of a workpiece, the cooling speed of the workpiece is uniform and controllable, and has a wide range of applications.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A thermoforming mold, comprising:

[0008] An upper mold and a lower mold, wherein a cavity for placing a workpiece is formed between the upper mold and the lower mold, and each of the upper mold and the lower mold has a cavity therein, and a hollow portion is provided at a target position on one side of the upper mold and the lower mold near the cavity, the hollow portion being connected to the cavity so that a medium in the cavity can be sprayed onto the workpiece through the hollow portion;

[0009] a plurality of ejectors, wherein the ejectors are installed in the cavities of the upper mold and / or the lower mold;

[0010] A plurality of medium pipelines are arranged in the cavity, the medium pipelines are used to provide medium to the spray body, and the pressure of the medium pipelines is adjustable.

[0011] On the other hand, the pressures in at least two of the medium pipelines are different; or the temperatures of the media in at least two of the medium pipelines are different; or the types of the media in at least two of the medium pipelines are different.

[0012] On the other hand, it also includes an upper mold connecting plate and a lower mold connecting plate. The upper mold is installed on the upper mold connecting plate and moves according to the upper mold connecting plate. The lower mold is installed on the lower mold connecting plate and moves with the lower mold connecting plate.

[0013] On the other hand, the setting position of the hollow part corresponds to the position of the hard area of ​​the workpiece, and the installation position of the injection body corresponds to the position of the hollow part.

[0014] On the other hand, the hollow portion is located between two adjacent supporting contact portions, and the supporting contact portions and the hollow portions are arranged alternately; the supporting contact portions are in the shape of elastic strips.

[0015] On the other hand, the width of the support contact portion is 3-50 mm, the width of the hollow portion is 3-90 mm; and / or the distance between the jet and the workpiece is 120-600 mm; the jet shape of the jet is conical, and the central angle of the cone is less than or equal to 125°.

[0016] On the other hand, the support contact portion is made of stainless steel.

[0017] On the other hand, it further comprises a connector for installing the medium pipeline into the cavity, wherein the position of the connector is adjustable to change the position and angle of the medium pipeline in the cavity.

[0018] On the other hand, it also includes:

[0019] A plurality of boosting devices, wherein the number of the medium pipelines is the same as the number of the boosting devices and the number of the medium pipelines corresponds to the number of the boosting devices;

[0020] A controller is connected to the boosting device, and is used to obtain the positions of the soft area and the hard area of ​​the workpiece, and determine the target pressure required for each of the medium pipelines based on the positions of the soft area and the hard area of ​​the workpiece; and is also used to control the operation of the boosting device based on the target pressure.

[0021] The present invention also provides a thermoforming device, comprising any one of the thermoforming molds described above.

[0022] The thermoforming mold provided by the present invention includes: an upper mold and a lower mold, a cavity for placing a workpiece is formed between the upper mold and the lower mold, and a cavity is provided inside the upper mold and the lower mold, and a hollow part is provided at the target position on one side of the upper mold and the lower mold close to the cavity, and the hollow part is connected to the cavity so that the medium in the cavity can be sprayed onto the workpiece through the hollow part; a plurality of ejectors, the ejectors are installed in the cavity of the upper mold and / or the lower mold; a plurality of medium pipelines are arranged in the cavity, the medium pipelines are used to provide medium to the ejectors, and the pressure of the medium pipelines is adjustable. The thermoforming mold provided by the present invention forms a specific shape and size of the workpiece through the cavity structure between the upper mold and the lower mold; in order to meet the soft and hard zoning requirements in the workpiece, the present application provides cavities in the interior of the upper mold and the lower mold, and provides hollow parts on the side of the upper mold and the lower mold close to the cavity. The hollow parts should be located at the target positions of the upper mold and the lower mold, and the target positions are determined according to the soft and hard zoning on the workpiece. Specifically, the cooling rate corresponding to the hard zone of the workpiece is larger, and the hollow parts can be set at the corresponding positions; by arranging the medium pipeline in the cavity, a number of the ejectors, i.e., nozzles, are distributed on the medium pipeline. Through the setting of the ejectors, the medium in the medium pipeline is sprayed onto the workpiece to ensure that the cooling rate of the hard zone in the workpiece is improved. The cooling speed is increased, while for the soft area on the workpiece, there is no need to set the hollow part, so as to reduce the cooling speed of the workpiece; more specifically, the number and size of the hollow parts at the position corresponding to the hard area of ​​the workpiece can be appropriately increased to increase the contact area between the medium and the workpiece, thereby increasing the cooling speed of the workpiece at this position; further, the arrangement direction of the medium pipeline is adapted to the shape of the workpiece, and the medium pressure in the same medium pipeline is the same. For example, the pressure in the medium pipeline corresponding to the hard area of ​​the workpiece can be greater than the pressure in the medium pipeline corresponding to the soft area of ​​the workpiece, or, different temperature control of the soft area and the hard area can be achieved by setting different media types or different media temperatures in different media pipelines, thereby improving the forming accuracy and efficiency of the workpiece, effectively eliminating the quenching deformation phenomenon of the workpiece, and the weldability of the workpiece after quenching is good, and the surface of the workpiece is not easily oxidized.

[0023] In one embodiment, there are several boosting devices, and the number of the media pipelines is the same as that of the boosting devices, and they correspond one to one; a controller is connected to the boosting device, and the controller is used to obtain the position of the soft area and the hard area of ​​the workpiece, and determine the target pressure required for each of the media pipelines according to the position of the soft area and the hard area of ​​the workpiece; and is also used to control the operation of the boosting device according to the target pressure. The above arrangement controls the boosting device through the controller, adjusts the pressure in the media pipeline, and thus meets the injection pressure of the injection body on each of the media pipelines. Since the media pipeline corresponds one to one with the boosting device, it is only necessary to obtain the distribution position of the soft area and the hard area in the workpiece to adjust the size of the pressure applied by the boosting device accordingly, which can realize automatic control, is conducive to improving the degree of automation, reducing the interference of human factors, maximizing the accuracy and efficiency of workpiece hot forming, and improving product quality.

[0024] The thermoforming equipment provided by the present invention is provided with the above-mentioned thermoforming mold. Since the thermoforming mold has the above-mentioned technical effects, the thermoforming equipment provided with the thermoforming mold should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a structural schematic diagram of a specific embodiment of the thermoforming mold provided by the present invention;

[0027] Figure 2 for Figure 1 A schematic structural diagram of the support contact portion and the hollow portion in the upper mold and the lower mold shown;

[0028] Figure 3 for Figure 1 Cross-sectional view of the injection body and the medium pipeline;

[0029] Figure 4 for Figure 1 A schematic diagram of the structure of the thermoforming mold when the upper mold and the lower mold are closed;

[0030] Figure 5 This is one of the implementation methods of hot and cold partitions in the thermoforming mold provided by the present invention;

[0031] Figure 6This is another way to realize the hot and cold zones in the thermoforming mold provided by the present invention;

[0032] Figure 7 This is a schematic structural diagram of a specific embodiment of the thermoforming equipment provided by the present invention;

[0033] Figure 8 for Figure 1 The transmission control mechanism diagram of the thermoforming equipment shown;

[0034] Figure 9 for Figure 1 The structural diagram of the water circulation system in the thermoforming equipment is shown.

[0035] Reference numerals:

[0036] Reference numerals:

[0037] Thermoforming mold 1; thermoforming equipment 2; workpiece 4;

[0038] Upper mold 11; lower mold 12; hollow portion 13; ejector 14; medium pipeline 15; mold upper connecting plate 16; mold lower connecting plate 17; upper connecting member 18; lower connecting member 19; support contact portion 110;

[0039] Equipment frame 21; upper slider 22; lower slider 23; transmission assembly 24; power component 24-1; power conversion component 24-2; torque transfer mechanism 24-3; feedback encoder 24-4; brake transmission component 24-5; rotating connection component 24-6; balancing cylinder 24-7; upper mold water supply installation adapter 25; upper water channel interface 26; lower water channel interface 27; exhaust gas collection component 28; water circulation system 29; circulating water collection box 29-1; return water component 29-2; water storage tank component 29-3; water supply component 29-4; secondary filter 29-5; tertiary filter 29-6; high-pressure water pump 29-7; water supply pipe 29-8; guide mechanism 210; quenching equipment protective cover 211; mold installation position 212. DETAILED DESCRIPTION

[0040] The core of the present invention is to provide a thermoforming mold and thermoforming equipment that can adapt to different workpieces, have low production costs, small size, and good forming effects.

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Hot forming technology refers to the process of heating steel plates at high temperatures to fully austenitize their structure, and then rapidly cooling them, thereby comprehensively improving the strength of the steel plates and increasing the yield strength of the steel to over 1000 MPa. For example, using this material in automobile body parts can reduce the weight of the vehicle body while increasing the strength of the vehicle body and achieving higher impact safety. Therefore, hot forming technology has been widely used in the automotive industry.

[0043] In the hot forming process of related technologies, press quenching is the key link to achieve the final performance, and the mold is the key factor in controlling the cooling process. The initial design of the indirect hot forming mold is to calculate the energy of the hot workpiece per unit time through the thermal conductivity parameters of the water channel and the material, and to achieve the defined strength of the workpiece by defining the cooling rate. However, press quenching has the following difficulties: First, it is difficult to precisely control the placement of the heated steel workpiece into the mold cavity, which increases the difficulty of process control. Second, the shape of the heated steel workpiece is usually not flat. If there are structures such as corners, the cooling rate will be inconsistent, resulting in uneven internal hardness of the workpiece and uncontrollable strength. Third, the water channel in the mold does not directly contact the steel workpiece, which results in slow cooling and low cooling efficiency. Fourth, the cost of hot forming quenching molds is expensive, which is difficult for ordinary companies to afford, and has greatly limited the promotion of indirect hot forming.

[0044] In this embodiment, please refer to Figures 1 to 6 , the thermoforming mold 1 includes:

[0045] An upper mold 11 and a lower mold 12 are formed between the upper mold 11 and the lower mold 12 to form a cavity for placing the workpiece 4. The upper mold 11 and the lower mold 12 are both provided with cavities. In addition, a hollow portion 13 is provided at a target position on one side of the upper mold 11 and the lower mold 12 near the cavity. The hollow portion 13 is connected to the cavity so that the medium in the cavity can be sprayed onto the workpiece 4 through the hollow portion 13.

[0046] A plurality of ejectors 14 are installed in the cavities of the upper mold 11 and / or the lower mold 12;

[0047] A plurality of medium pipelines 15 are provided in the cavity. The medium pipelines 15 are used to provide medium to the ejection body 14 , and the pressure of the medium pipelines 15 is adjustable.

[0048] Specifically, the thermoforming die 1 is suitable for most thermoforming materials in the automotive industry, including high-corrosion-resistant steel plates with single or composite coatings such as hot-dip galvanizing, hot-dip zinc-nickel, hot-dip galvanized iron alloy, electro-galvanizing, electro-galvanizing nickel, hot-dip aluminum-zinc, and hot-dip aluminum-silicon. Products produced using this die exhibit excellent mechanical properties and corrosion resistance during use and are suitable for use in front and rear bumpers, longitudinal load-bearing beams, roof side rails, door panel reinforcements, transverse support beams, floor tunnels, suspension mounts, A / B pillars, door sill safety structures, and battery casings for both traditional fuel-powered and new energy vehicles.

[0049] The thermoforming mold 1 provided by the present invention forms a specific shape and size of the workpiece 4 through the cavity structure between the upper mold 11 and the lower mold 12; in order to meet the soft and hard zoning requirements of the workpiece 4, the present application provides cavities in the interior of the upper mold 11 and the lower mold 12, and provides a hollow part 13 on the side of the upper mold 11 and the lower mold 12 close to the cavity. The hollow part 13 should be located at the target position of the upper mold 11 and the lower mold 12, and the target position is determined according to the soft and hard zoning on the workpiece 4. Specifically, the cooling rate corresponding to the hard area of ​​the workpiece 4 is larger, and the hollow part 13 can be set at the corresponding position; by arranging a medium pipeline 15 in the cavity, a number of ejectors 14, i.e., nozzles, are distributed on the medium pipeline 15. Through the setting of the ejector 14, the medium in the medium pipeline 15 is sprayed onto the workpiece 4 to ensure that the cooling rate of the hard area in the workpiece 4 is increased, and for the workpiece In the soft zone of the workpiece 4, there is no need to provide the hollow portion 13, thereby reducing the cooling rate of the workpiece 4. More specifically, the number and size of the hollow portions 13 at the positions corresponding to the hard zones of the workpiece 4 can be adjusted as needed to change the contact area between the medium and the workpiece 4, thereby increasing the cooling rate of the workpiece 4 at that location. Furthermore, the arrangement direction of the medium pipeline 15 is adapted to the shape of the workpiece 4, and the medium pressure in the same medium pipeline 15 is the same. For example, the pressure in the medium pipeline 15 corresponding to the hard zone of the workpiece 4 can be greater than the pressure in the medium pipeline 15 corresponding to the soft zone of the workpiece 4. Alternatively, different medium types or different medium temperatures can be provided in different medium pipelines 15 to achieve different temperature control for the soft and hard zones, thereby improving the forming accuracy and efficiency of the workpiece 4, effectively eliminating quenching deformation of the workpiece 4, and ensuring good weldability of the quenched workpiece, and preventing oxidation of the workpiece 4 surface. This thermoforming die can meet the thermoforming processing requirements of soft and hard zones or full hard zones, while also having the characteristics of precise forming, good weldability, effective elimination of quenching deformation, and preventing oxidation of the workpiece 4 surface.

[0050] In some embodiments, the pressures in at least two medium pipelines 15 are different. The higher the pressure, the faster the workpiece 4 cools. Different pressure settings can be made for the soft zone and the hard zone to meet different requirements. Of course, the pressures in the medium pipelines 15 can also be the same.

[0051] In some embodiments, the temperatures of the media in at least two media pipes 15 are different. The lower the temperature, the faster the workpiece 4 cools. Different temperatures can be set for the soft zone and the hard zone to meet different requirements. Of course, the temperatures in each media pipe 15 can also be the same.

[0052] In some embodiments, at least two media lines 15 contain different media types. For example, liquid water, compressed air, or a gas-liquid mixture can be selected. By introducing different media types into the media lines 15, different cooling requirements can be met. Of course, the media types in each media line 15 can also be the same.

[0053] Specifically, through the above-mentioned settings, hot and cold zones can be achieved by setting different pressures in each medium pipeline 15, or by adding heating rods to adjust the temperature of the medium in each medium pipeline 15, or by introducing different media into the medium pipeline 15 to control the hot and cold zones.

[0054] In some embodiments, it also includes a mold upper connecting plate 16 and a mold lower connecting plate 17. The upper mold 11 is installed on the mold upper connecting plate 16 and moves according to the mold upper connecting plate 16. The lower mold 12 is installed on the mold lower connecting plate 17 and moves with the mold lower connecting plate 17. Further, the mold upper connecting plate 16 and the mold lower connecting plate 17 are respectively installed on the upper slider 22 and the lower slider 23 of the thermoforming equipment 2. The mold upper connecting plate 16 and the mold lower connecting plate 17 are moved closer or farther away from each other by the upper slider 22 and the lower slider 23, thereby completing the mold closing and mold opening of the upper mold 11 and the lower mold 12.

[0055] In some embodiments, the location of the hollow portion 13 corresponds to the hard area of ​​the workpiece 4. Since the medium in the hollow portion 13 is in direct contact with the workpiece 4, the medium can cool the workpiece 4 more quickly through the hollow portion 13, thereby increasing the hardness of the workpiece 4 in this area. Furthermore, to enhance the effect of the jet 14 on the workpiece 4, the installation position of the jet 14 corresponds to the location of the hollow portion 13. Of course, the position of the jet 14 can also be adjusted as needed or according to the size and shape of the cavity. The cooling rate of the workpiece 4 is primarily adjusted by the location and size of the hollow portion 13, as well as the pressure, temperature, and type of the medium.

[0056] In some embodiments, the hollow portion 13 is located between adjacent support contact portions 110, and the support contact portions 110 and the hollow portions 13 are arranged alternately. By alternating the support contact portions 110 and the hollow portions 13, processing can be facilitated and the position constraint on the workpiece 4 can be improved; and, at the position corresponding to the hard area of ​​the workpiece 4, the setting density of the hollow portion 13 can be appropriately increased.

[0057] The support contact portion 110 is in the shape of an elastic slat. Specifically, the support contact portion 110 adopts a slat-shaped structure. By leaving a certain elastic margin in the support contact portion 110, it can be compatible with the entire quenching process of the workpiece 4 heated to a high temperature above Ac3 and cooled to 180°C. Since the deformation of the workpiece 4 during the entire quenching process is large, the slat-shaped structure plays a certain restraining role on the shape change of the workpiece 4, which is beneficial to the hot forming of the workpiece 4 and improves the forming accuracy of the workpiece 4.

[0058] In some embodiments, the width of the support contact portion 110 is 3-50 mm. The width of the support contact portion 110 should not be too small, as it should provide support for the workpiece 4, nor should it be too large, as this will result in poor cooling effect. The width of the hollow portion 13 is 3-90 mm. The width of the hollow portion 13 should not be too small, as this will result in poor cooling effect, nor should it be too large, as this will affect the width of the support contact portion 110, thereby failing to provide good support for the workpiece 4. And / or, the distance between the ejector 14 and the workpiece 4 is 120-600 mm. The distance between the ejector 14 and the workpiece 4 refers to the distance between the ejector 14 and the workpiece 4 after the upper mold 11 and the lower mold 12 are closed. The size of the distance between the ejector 14 and the workpiece 4 will be adjusted according to the injection rate and flow rate of the medium. The injection shape of the ejector 14 is conical, and the central angle of the cone is less than or equal to 125°. This setting can better spray the medium on the workpiece 4 and increase the cooling rate of the workpiece 4. Furthermore, the transition zone between the soft and hard partitions is 3mm to 60mm, which has a wide range of applications.

[0059] In some embodiments, the support contact portion 110 is made of stainless steel to improve its service life. Specifically, in order to improve the wear resistance of the support contact portion 110 , the thickness of the support contact portion 110 can be increased, or a wear-resistant coating can be provided on the surface of the support contact portion 110 .

[0060] In some embodiments, a connector for installing the media pipeline 15 into the cavity is further included. The position of the connector is adjustable to change the position and angle of the media pipeline 15 in the cavity. Specifically, the connector includes an upper connector 18 and a lower connector 19. There are two upper connectors 18 and two lower connectors 19. The media pipeline 15 in the upper mold 11 is installed between the two upper connectors 18, and the media pipeline 15 in the lower mold 12 is installed between the two lower connectors 19. The installation height of the media pipeline 15 in the upper mold 11 can be adjusted by the upper connector 18, and the installation height of the media pipeline 15 in the lower mold 12 can be adjusted by the lower connector 19, thereby changing the distance between the ejector 14 and the workpiece 4.

[0061] In some embodiments, further comprising:

[0062] There are several boosting devices, and the number of medium pipelines 15 is the same as that of the boosting devices, and they correspond one to one;

[0063] The controller is connected to the boosting device. The controller is used to obtain the positions of the soft area and the hard area of ​​the workpiece 4, and determine the target pressure required by each medium pipeline 15 according to the positions of the soft area and the hard area of ​​the workpiece 4; and is also used to control the operation of the boosting device according to the target pressure.

[0064] The above-mentioned setting controls the boosting device through the controller and adjusts the pressure in the medium pipeline 15 to meet the injection pressure of the ejector 14 on each medium pipeline 15. Since the medium pipeline 15 corresponds to the boosting device one by one, it is only necessary to obtain the distribution position of the soft area and the hard area in the workpiece 4 to adjust the size of the pressure applied by the boosting device accordingly. Automatic control can be achieved, which is conducive to improving the degree of automation, reducing interference from human factors, maximizing the accuracy and efficiency of the hot forming of the workpiece 4, and improving product quality.

[0065] Specifically, in a specific embodiment, the thermoforming mold 1 is a thermoforming mold 1 device with soft and hard partitions and full hard zones. During the hot stamping process, the hollow part 13 is in direct contact with the workpiece 4 or the thermoformed part heated to above Ac3; the medium pipeline 15 is used to store and transport the cooling medium, which is connected to the upper mold 11 or the lower mold 12 through the connectors at both ends. There are multiple ejectors 14, which are mechanically connected and sealed to the connecting holes of the medium pipeline 15. The upper connecting base plate of the mold and the lower connecting base plate of the mold are connected to the upper mold 11 or the lower mold 12 through mechanical connectors. The upper and lower surfaces of the upper connecting base plate of the mold and the lower connecting base plate of the mold are respectively connected to the upper slider 22 and the lower slider 23 of the press. When the pressure of the medium pipeline 15 reaches the pressure threshold of 0.3Mpa to 3Mpa, the medium is transported to the multiple ejectors 14 through the medium pipeline 15. The ejectors 14 on each medium pipeline 15 spray the cooling medium at different pressures to perform the quenching process. The excess cooling medium injected is recycled for secondary use through a dedicated pipeline; the medium pipeline 15 is equipped with a booster device, and its pressure value can reach 0.3Mpa to 3Mpa. The booster device has the functions of automatic start and stop, and adjustable and controllable pressure value; multiple spray bodies 14 are arranged according to the shape of the workpiece 4, and the atomization particle size of each spray body 14 is between 90 microns and 400 microns, and the flow rate is between 80ml per minute and 1000ml per minute; the installation distance between the spray body 14 and the workpiece 4 on different medium pipelines 15 is different, and the distance from the injection start position to the workpiece 4 is between 120mm and 600mm; the injection angle of the spray body 14 is within 135°, and its injection shape is a solid cone or a hollow cone; the material of the support contact part 110 can be steel surface coating, or directly made of stainless steel; the spray body 14 can adopt an upper and lower layout structure, that is, the medium pipeline 15 and the spray body 14 are arranged in the upper mold 11 and the lower mold 12, or a single upper layout structure, or a single lower layout structure.

[0066] Specifically, the hot stamping process using the hot forming die 1 includes:

[0067] Step S1: Galvanized steel sheet blanking: The steel is processed into coils or sheets and cut according to the required size; or Al-Si steel sheet blanking is also applicable; of course, bare steel sheet without coating can also be used;

[0068] Step S2: cold stamping: using a mold to cold stamp to form a steel workpiece 4;

[0069] Step S3: Heating: The steel workpiece 4 is heated to a temperature above Ac3. When the steel surface is uncoated in step S1, the steel workpiece 4 is first heated to above 700°C at a rate of 12-28°C / s, then heated to above Ac3 at a rate of 1-5°C / s, and maintained at this temperature for 28-55 seconds. When the steel is surface treated by any of Zn plating, Al plating, Al-Si plating, and high-temperature oxidant coating in step S1, the steel workpiece 4 is heated to a temperature below 500°C at a rate of 8-15°C / s in step S3, then heated to a temperature between 560°C and 980°C at a rate of 15-30°C / s, then heated to above Ac3 at a rate of 1-5°C / s, and maintained at this temperature for 28-55 seconds.

[0070] Step S4: transferring the workpiece 4 to a hot stamping machine;

[0071] Step S5: The upper mold 11 assembly is clamped along the X direction so that it gradually fits the workpiece 4 and is pressed against the lower mold 12 assembly;

[0072] Step S6: activating the booster device to supply water to the medium pipeline 15 , and under the action of the pressure, the multiple spray bodies 14 begin to spray the medium to perform hot forming and quenching on the workpiece 4 ;

[0073] Step S7: After quenching is completed, the supercharging device stops;

[0074] Step S8: The upper mold 11 assembly part moves in the opposite direction of X until the mold opening is completed.

[0075] The above process completes the clamping and shaping of the hot stamped part by lowering the upper die 11 in the X direction and clamping the workpiece 4 with the lower die 12. The opening of the booster allows the multiple jets 14 to perform quenching spraying. The booster opens after the clamping action, and the mold opening action is performed before the booster closes. This process can enhance the controllability of steel quenching and simplify the production process of the hot forming process. The first stage uses a fluid blowing method to directly contact the fluid cooling medium with the steel workpiece 4 heated to above AC3. the surface of the steel workpiece 4, so that it drops to 250-450°C within a control time of 2 seconds to 10 seconds; the second stage adopts a fluid blowing method to make the fluid cooling medium directly contact the surface of the steel workpiece 4, so that it drops to below 100°C within a control time of 2 seconds to 10 seconds, meeting the performance characteristics of the workpiece 4; of course, the temperature of the surface of the steel workpiece 4 can also be cooled continuously without two stages, for example, it can be dropped to below 100°C within a control time of 2 seconds to 30 seconds; the structural design of the mold is simplified, the cooling rate of the steel workpiece 4 is improved, and the cooling of the steel workpiece 4 is more uniform and controllable; it solves the problem in the related art that the hot and cold zones are basically divided into hot and cold zones by making different functional modules on the mold, which makes it difficult to implement smaller areas, and the mold structure of the hot and cold zones is relatively complex, the water channel and the heating body coexist in one mold, and there is also a safety hazard; the hot and cold zone method of the mold is simple to arrange and change, can be modularly designed, is light in weight, and has high adaptability and flexibility for changing the structure of the product and the position of the hot and cold zones.

[0076] In addition to the above-mentioned thermoforming mold 1 , the present invention further provides a thermoforming device 2 including the above-mentioned thermoforming mold 1 .

[0077] In this embodiment, please refer to Figures 7 to 9 , the thermoforming equipment 2 includes:

[0078] Equipment frame 21;

[0079] The upper slider 22 and the lower slider 23 are both installed on the equipment frame 21. The upper slider 22 is used to drive the upper mold 11 to move, and the lower slider 23 is used to drive the lower mold 12 to move;

[0080] The transmission assembly 24 is mounted on the equipment frame 21 and includes a power component 24-1, a power conversion component 24-2 connected to the power component 24-1, a torque transfer mechanism 24-3 connected to the power conversion component 24-2, and a feedback encoder 24-4 for obtaining the rotation angle of the torque transfer mechanism 24-3. The power conversion component 24-2 and the torque transfer mechanism 24-3 are both gear-shaped. The torque transfer mechanism 24-3 is used to drive the upper slider 22 to move toward or away from the lower slider 23.

[0081] The controller, the power component 24 - 1 and the feedback encoder 24 - 4 are all connected to the controller, and the controller is used to control the action of the power component 24 - 1 according to the rotation angle of the torque transfer mechanism 24 - 3 obtained by the feedback encoder 24 - 4 .

[0082] Specifically, the rotation of the torque transfer mechanism 24-3 drives the upper slider 22 to move up and down, realizing the opening and closing of the mold of the entire equipment; the power component 24-1 provides power support for the downward pressure, positioning and lifting of the upper slider 22. The power component 24-1 can adjust the equipment torque according to the actual needs of the equipment, and then control the pressure of the equipment. Its tonnage can be controlled between 1-600T and can be adjusted; the power component 24-1 can cooperate with the torque transfer mechanism 24-3 and provide signal feedback to form a closed-loop control of the transmission position, so as to achieve control of position accuracy, and its repeated positioning accuracy can reach ±0.03mm; by replacing power conversion components 24-2 and torque transfer mechanisms 24-3 of different specifications, the transmission ratio between the power conversion component 24-2 and the torque transfer mechanism 24-3 can be 1 to 100 to meet different usage requirements.

[0083] The thermoforming equipment 2 utilizes the gear transmission between the power component 24-1, the power conversion component 24-2 and the torque transfer mechanism 24-3 to improve the position movement accuracy of the upper slider 22, thereby effectively improving the mold closing position accuracy between the upper mold 11 and the lower mold 12, and further improving the processing accuracy of the workpiece 4; further, by adding a feedback encoder 24-4, the feedback encoder 24-4 is used to obtain the rotation angle of the torque transfer mechanism 24-3, and the feedback is fed back to the controller, so that the moving position of the feedback block can be better fed back, further improving the mold closing position accuracy between the upper mold 11 and the lower mold 12, and further improving the processing accuracy of the workpiece 4.

[0084] In some embodiments, the transmission assembly 24 also includes a brake transmission component 24-5, which is used to transmit the power of the power component 24-1 to the power conversion component 24-2. The brake transmission component 24-5 is connected between the power component 24-1 and the power conversion component 24-2, and the brake transmission component 24-5 is connected to the controller. The controller is also used to control the brake transmission component 24-5 to stop after the upper slider 22 moves to the target position; the brake transmission component 24-5 is also a transmission gear, and the brake transmission component 24-5 is connected to the power component 24-1 and engages with the power conversion component 24-2 to transmit the action of the power component 24-1 to the power conversion component 24-2; the brake transmission component 24-5 can protect the power component 24-1, and can also improve the positioning accuracy of the equipment and support the positioning stability of the entire equipment.

[0085] In some embodiments, the transmission assembly 24 also includes a rotating connecting component 24-6, one end of the rotating connecting component 24-6 is hinged to the torque transfer mechanism 24-3, and the other end is hinged to the upper slider 22. The torque transfer mechanism 24-3 pulls the upper slider 22 up and down through the rotating connecting component 24-6 to ensure the smooth lifting and lowering of the upper slider 22; the transmission assembly 24 constitutes the power source of the equipment and the position closed-loop control mechanical part of the entire equipment.

[0086] In some embodiments, the number of the power conversion component 24-2, the torque transfer mechanism 24-3 and the rotating connection component 24-6 is at least two, and they are symmetrically distributed along the left and right sides of the brake transmission component 24-5, and at least one rotating connection component 24-6 is distributed and connected to the left and right sides of the upper slider 22; with this arrangement, the two sides of the upper slider 22 move synchronously, so that its positioning accuracy is better.

[0087] In some embodiments, the transmission assembly 24 also includes a balancing cylinder 24-7, which is used to balance the physical weight of the upper slider 22 and the upper mold 11, reducing the torque and power of the power component 24-1, thereby saving energy. The device can achieve a maximum mold opening and closing speed of 2 m / s, and its opening and closing speed can also be adjusted to 0.1-2 m / s. The stroke of the upper mold 11 can be 0-4 m, and the mold opening distance can be adjusted to a range of 0-3 m. Due to the device's high control precision, the work surface size of the lower module can be as large as 3500 mm by 5000 mm, meeting the processing requirements of small-tonnage and large-sized workpieces 4.

[0088] In some embodiments, a work surface is provided on the upper portion of the lower slider 23, and a plurality of positioning grooves for positioning the lower mold 12 and a plurality of fixing grooves for fixing the lower mold are provided on the work surface, and the positioning grooves and the fixing grooves are arranged in an array; specifically, the work surface of the lower slider 23 has a cross-shaped positioning groove, which is used to replace the mold and position the mold for installation, that is, when the same model of thermoforming mold 1 is used, a positioning block can be installed in the positioning groove, without repeated positioning, thereby improving the mold installation efficiency; the fixing groove is a T-slot, which can be connected and fixed to the lower mold 12 of the thermoforming mold 1 through the T-slot to ensure the stable position of the lower mold 12.

[0089] In some embodiments, further comprising:

[0090] The upper mold water supply installation adapter 25 is used to connect to the external pipeline. The upper mold water supply installation adapter 25 is installed on the equipment frame 21, and the upper mold 11 is provided with a quick-release joint that is detachably connected to the upper mold water supply installation adapter 25, and the quick-release joint is connected to the medium pipeline 15. Specifically, the upper mold water supply installation adapter 25 can be directly integrated into the equipment frame 21, or connected to the equipment frame 21 by bolts. The external pipeline transfers the medium to be cooled to the upper mold water supply installation adapter 25 through a flexible connection or a hard connection. The upper mold 11 of the thermoforming mold 1 has a quick-change joint, and a hose or a hard pipe can be connected in the middle to supply the cooling medium. Of course, it can also include a lower mold water supply installation adapter for connecting to the external pipeline. The lower mold water supply installation adapter is installed on the equipment frame 21, and the lower mold 12 is provided with a quick-release joint that is detachably connected to the lower mold water supply installation adapter, and the quick-release joint is connected to the medium pipeline 15. Specifically, the lower mold water supply adapter can be directly integrated into the equipment frame 21 or connected to it via bolts. External piping transfers the cooling medium to the lower mold water supply adapter via flexible or rigid connections. The lower mold 12 of the thermoforming mold 1 has a quick-change connector, which can be connected to a flexible hose or rigid pipe to supply the cooling medium. Furthermore, the upper mold water supply adapter 25 and the lower mold water supply adapter are compatible with high and low pressures, and can accommodate different pressures from 0.1 MPa to 30 MPa, adapting to different working conditions.

[0091] In some embodiments, an upper water channel interface 26 and a lower water channel interface 27 are further included. The upper water channel interface 26 is installed on the upper slider 22, and the lower water channel interface 27 is installed on the lower slider 23. The upper water channel interface 26 is connected to the quick-release connector. The upper water channel interface 26 is connected to the upper mold water supply installation adapter 25 through a hose or a hard pipe, so that the medium is transported to the upper mold 11 to facilitate the quenching process.

[0092] In some embodiments, further comprising:

[0093] The exhaust gas collecting component 28 is used to collect the exhaust gas during the quenching process. The exhaust gas collecting component 28 is installed on the top of the equipment frame 21;

[0094] The water circulation system 29 is used to collect the medium and recycle it. The water circulation system 29 includes: a circulating water collection tank 29-1, which is used to store the cooling water recovered from the self-heating forming mold 1 and perform a primary filtration on the cooling water; a return water component 29-2, which is used to extract the cooling water from the heat forming mold 1 and transport it to the circulating water collection tank 29-1. The return water component 29-2 is connected to the circulating water collection tank 29-1; a water storage tank component 29-3, which is used to store the once filtered circulating water in the circulating water collection tank 29-1. The water storage tank component 29-3 can stabilize the water pressure and water volume, making the water supply process of the quenching equipment smoother and smoother; a water supply component 29-4, which is used to obtain the circulating water collection tank 29-1. The primary filtered circulating water in the collecting tank 29-1 is delivered to the water storage tank component 29-3, and the water storage tank component 29-3 is connected to a water supply channel for delivering cooling water to the thermoforming mold 1; the secondary filter 29-5 and / or the tertiary filter 29-6 are installed on the water supply channel to perform secondary and / or tertiary filtration on the cooling water in the water supply channel, the secondary filter 29-5 is used to filter the water in the water supply channel, and the tertiary filter 29-6 filters the water in the water supply channel again to ensure the cleanliness of the water used by the equipment; the high-pressure water pump 29-7 is installed on the water supply pipe 29-8 to adjust the water supply pressure of the water supply channel, and its adjustable range is 0-3Mpa.

[0095] In some embodiments, a guide mechanism 210 is further included, which is installed in the equipment frame 21, and the upper slider 22 is slidably connected to the guide mechanism 210; the lower slider 23 is slidably installed in the equipment frame 21, and the lower slider 23 can slide from the inside of the equipment frame 21 to the outside to replace the mold. In the above arrangement, the guide mechanism 210 can be a guide rail, such as a steel guide rail. By setting the guide mechanism 210, the smoothness of the upper slider 22 during the lifting process can be improved, thereby further improving the moving position accuracy of the upper slider 22, thereby improving the position accuracy of the upper mold 11; further, the lower slider 23 can slide from the inside of the equipment frame 21 to the outside, that is, the lower slider 23 is a movable workbench, which can be moved horizontally out of the equipment frame 21 to the left and right to replace the mold, thereby increasing the convenience and timeliness of replacing the mold.

[0096] In some embodiments, a device base is further provided at the bottom of the device frame 21. The device frame 21 is installed on the device base, which can better support the device frame 21 and ensure the stability of the device frame 21, thereby ensuring the smooth movement of the upper mold 11 and the lower mold 12.

[0097] In some embodiments, a quenching equipment protective cover 211 is also installed on the equipment frame 21 to protect the medium from splashing during the quenching process. A mold mounting position 212 is also installed on the equipment frame 21, and the thermoforming mold 1 is installed and replaced through the mold mounting position 212.

[0098] In a specific embodiment, the thermoforming equipment 2 includes an equipment frame 21 and an equipment base. The equipment frame 21 includes two parts, one part is installed on the equipment base, and the other part carries the transmission component 24. These three parts are the main frame part of the equipment, which carries all the mechanism installation and mechanism support, as well as the installation position of standard parts; the power component 24-1 provides power system support for the up and down movement and positioning of the equipment, and the brake transmission component 24-5 is used to transmit the power of the power component 24-1, and use the brake transmission component 24-5 for braking when positioning is required; the power conversion component 24-2 is used to lengthen the space of the transfer power system so that its entire work surface can be evenly stressed; the torque transfer mechanism 24-3 is used to expand the force space of the equipment and increase the downward pressure tonnage of the equipment. The guide mechanism 210 is used to balance the smoothness of the up and down movement of the entire upper slider 22. The upper slider 22 is provided with a mounting groove and a mounting plate for installing the upper Mold 11; the thermoforming mold 1 is a hot and cold partitioned thermoforming mold 1, which is used for quenching operations of the entire process of quenching thermoforming parts; the lower slider 23 is provided with a mounting groove and a mounting plate, which is the mounting part of the lower mold 12, and is used to fix the lower mold part of the thermoforming mold 1; the balancing cylinder 24-7 is used to balance the mounting groove and mounting plate of the upper slider 22, as well as the physical dead weight of the upper mold 11, reducing the torque and power of the power system, and playing a role in energy saving; the exhaust gas collection device is used to collect exhaust gas in the thermoforming quenching process for centralized recycling and treatment, and its flow rate can replace the air in the equipment once every 10 seconds; the upper water channel interface 26 is used to connect the upper mold 11 of the soft and hard partitioned thermoforming mold 1, and the upper water channel interface 26 provides a medium for quenching operations for the upper thermoforming mold 1; the lower water channel interface 27 is used to connect the lower mold 12 of the soft and hard partitioned thermoforming mold 1, and the lower water channel interface 27 provides a medium for quenching operations for the lower mold 12. Through the above settings, the power consumption of the device is reduced, the efficiency of the device is improved, and the floor space of the device is reduced.

[0099] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0100] The above describes in detail the thermoforming mold provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A thermoforming mold, characterized in that: include: An upper mold (11) and a lower mold (12), a cavity for placing a workpiece (4) therein is formed between the upper mold (11) and the lower mold (12), a cavity is provided inside the upper mold (11) and the lower mold (12), and a hollow portion (13) is provided at a target position on one side of the upper mold (11) and the lower mold (12) close to the cavity, the hollow portion (13) is communicated with the cavity so that the medium in the cavity can be sprayed onto the workpiece (4) through the hollow portion (13); the setting position of the hollow portion (13) corresponds to the hard zone position of the workpiece (4); the hollow portion (13) is located between two adjacent supporting contact portions (110), the supporting contact portions (110) and the hollow portion (13) are alternately arranged, and the supporting contact portion (110) is in the shape of an elastic strip; a plurality of ejectors (14), wherein the ejectors (14) are installed in the cavities of the upper mold (11) and / or the lower mold (12); A plurality of medium pipelines (15) are arranged in the cavity, the medium pipelines (15) are used to provide medium to the injection body (14), and the pressure of the medium pipelines (15) is adjustable.

2. The thermoforming mold according to claim 1, characterized in that The pressures in at least two of the medium pipelines (15) are different; or, the temperatures of the media in at least two of the medium pipelines (15) are different; or, the types of the media in at least two of the medium pipelines (15) are different.

3. The thermoforming mold according to claim 1, characterized in that The mold further comprises an upper mold connecting plate (16) and a lower mold connecting plate (17), wherein the upper mold (11) is mounted on the upper mold connecting plate (16) and moves according to the upper mold connecting plate (16), and the lower mold (12) is mounted on the lower mold connecting plate (17) and moves following the lower mold connecting plate (17).

4. The thermoforming mold according to claim 1, characterized in that The installation position of the ejection body (14) corresponds to the position of the hollow portion (13).

5. The thermoforming mold according to claim 1, characterized in that The width of the support contact portion (110) is 3-50 mm, and the width of the hollow portion (13) is 3-90 mm; and / or the distance between the jet body (14) and the workpiece (4) is 120-600 mm; the jet shape of the jet body (14) is conical, and the central angle of the cone is less than or equal to 125°.

6. The thermoforming mold according to claim 1, characterized in that The supporting contact portion (110) is made of stainless steel.

7. The thermoforming mold according to any one of claims 1 to 6, characterized in that: It also includes a connector for installing the medium pipeline (15) into the cavity, and the position of the connector is adjustable to change the position and angle of the medium pipeline (15) in the cavity.

8. The thermoforming mold according to any one of claims 1 to 6, characterized in that: Also includes: A plurality of boosting devices, wherein the number of the medium pipelines (15) is the same as the number of the boosting devices and corresponds one to one; A controller is connected to the boosting device, the controller is used to obtain the positions of the soft area and the hard area of ​​the workpiece (4), and determine the target pressure required by each of the medium pipelines (15) according to the positions of the soft area and the hard area of ​​the workpiece (4); and is also used to control the operation of the boosting device according to the target pressure.

9. A thermoforming device, comprising a thermoforming die (1), characterized in that: The thermoforming mold (1) is the thermoforming mold according to any one of claims 1 to 8.

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