Article forming apparatus

Abstract

The application relates to the technical field of stamping equipment, and provides a workpiece forming device, which is suitable for stamping forming of a galvanized steel plate workpiece, comprises a stamping die with an upper die and a lower die, and a liquid storage tank provided with a heating module. A cooling liquid groove is arranged on the lower die, a forming structure for workpiece forming on the lower die is located in the cooling liquid groove, and cooling flow channels for cooling the workpiece are arranged in the lower die and the upper die respectively. The liquid storage tank is communicated with the cooling liquid groove through a pipeline, a cooling liquid pump is arranged on the pipeline, the heated cooling liquid in the liquid storage tank can enter the cooling liquid groove through the cooling liquid pump, and the cooling liquid in the cooling liquid groove can flow back to the liquid storage tank through the cooling liquid pump. The application can utilize the cooling liquid in the cooling liquid groove to precool the heated galvanized steel plate workpiece and treat the zinc layer, can effectively avoid brittle fracture of the galvanized steel plate workpiece during stamping, and is favorable for guaranteeing the hot stamping forming quality of the galvanized steel plate workpiece.

Description

Technical Field

[0001] This application relates to the field of stamping equipment technology, and in particular to a part forming device. Background Technology

[0002] Currently, galvanized steel sheet parts prepared by hot stamping can effectively solve the problems of spot welding spatter and sharp edge corrosion that are easily generated in hot-formed aluminum-silicon sheet parts and bare sheet parts. In addition, the zinc (Zn) layer in galvanized steel sheet has a cathodic protection effect, which can also enable the parts to obtain better corrosion resistance.

[0003] However, in existing hot stamping processes for galvanized steel sheet parts, the galvanized steel sheet is typically heated to over 900°C for stamping. At this temperature, the zinc layer is liquid, and the liquid zinc enters the austenite grain boundaries of the steel sheet and diffuses along these boundaries, leading to austenite embrittlement. If the steel sheet is then hot-stamped under these conditions, the tensile load causes deformation, which can easily lead to brittle fracture of the steel sheet, making it difficult to guarantee the stamping quality of the galvanized steel sheet parts. Utility Model Content

[0004] In view of this, the present application aims to provide a part forming apparatus to facilitate ensuring the hot stamping forming quality of galvanized steel sheet parts.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A part forming apparatus suitable for hot stamping forming of galvanized steel sheet parts, comprising a stamping die having an upper die and a lower die, and a liquid storage tank equipped with a heating module; The lower mold is provided with a coolant tank, and the forming structure on the lower mold for forming the part is located in the coolant tank. The lower mold and the upper mold are respectively provided with cooling channels for cooling the part. The storage tank is connected to the coolant tank via a pipeline, and a coolant pump is installed on the pipeline. The heated coolant in the storage tank can enter the coolant tank through the coolant pump, and the coolant in the coolant tank can flow back to the storage tank through the coolant pump.

[0006] Furthermore, the cooling channels within the upper mold and / or the lower mold are in multiple sets, each set of cooling channels being used to cool different locations of the part; In the plurality of cooling channels, at least one group of cooling channels has a different cooling capacity for the part than the other groups of cooling channels.

[0007] Furthermore, the cooling capacity of one group of cooling channels differs from that of other groups of cooling channels, including the channel density in that group of cooling channels, and / or the distance between the channel and the molding surface of the molding structure used for part molding is different from that of other groups of cooling channels.

[0008] Furthermore, the liquid storage tank and the coolant tank are connected by a single pipeline, and the coolant pump is a bidirectional coolant pump connected in series in the pipeline.

[0009] Furthermore, the pipeline is made of flexible tubing.

[0010] Furthermore, the depth of the coolant tank is set such that when the coolant entering the coolant tank reaches a preset working level, the coolant can completely cover the component, and the preset working level is numerically less than the tank depth.

[0011] Furthermore, the coolant tank is equipped with a liquid level detection unit.

[0012] Furthermore, the liquid storage tank is equipped with a temperature detection unit and a control unit connected to the temperature detection unit and the heating module; The control unit is used to turn the heating module on and off, and the control unit is configured to maintain the coolant in the storage tank at a temperature not lower than a preset temperature under the detection of the temperature detection unit.

[0013] Compared with related technologies, this application has the following advantages: (1) The part forming apparatus described in this application is provided with a liquid storage tank with a heating module, and the heated coolant in the liquid storage tank can enter the coolant tank through a coolant pump. Thus, based on the cooling in the cooling channel in the mold, the coolant entering the coolant tank can be used to pre-cool the heated galvanized steel sheet part and treat the zinc layer. This can effectively prevent brittle fracture of the galvanized steel sheet part during hot stamping, thereby helping to ensure the hot stamping forming quality of the galvanized steel sheet part.

[0014] (2) The cooling channels in the upper and lower dies are multiple sets that cool different positions of the workpiece, and the cooling capacity of the multiple sets of cooling channels is different. The differential design of the cooling capacity of each set of cooling channels in the upper and lower dies can be used to adapt well to the cooling requirements of hot forming of galvanized steel sheets of different thicknesses. This ensures that the galvanized steel sheet of different thicknesses can reach a sufficient cooling rate, realize the martensitic phase transformation at each position of the galvanized steel sheet, and further ensure the overall strength of the galvanized steel sheet workpiece after forming on the basis of avoiding brittle fracture of the galvanized steel sheet. This is conducive to better improving the stamping quality of the galvanized steel sheet workpiece.

[0015] (3) By setting the density of the flow channels in the cooling channel and the distance between the flow channel and the molding surface of the molding structure used for part molding, the cooling capacity of one group of cooling channels is different from that of other groups of cooling channels. This not only realizes the differentiated design of the cooling capacity of the cooling channels in the upper and lower molds, but also has the advantages of simple structure and easy design and implementation.

[0016] (4) The liquid storage tank and the coolant tank are connected by a single pipeline, and the coolant pump is a bidirectional coolant pump connected in series in the pipeline. This reduces the number of pipelines and coolant pumps, helps to reduce the cost of the device's components, and also helps to reduce the cost of modifying existing stamping dies, which is conducive to the promotion and application of the device.

[0017] (5) The pipeline uses flexible hoses, which facilitates the connection between the pipeline and the liquid storage tank and the coolant tank, and also facilitates the arrangement of the pipeline at the stamping die.

[0018] (6) The depth of the coolant tank is set so that the coolant can completely cover the workpiece when it reaches the preset working level, and the preset working level is numerically less than the depth of the coolant tank. On the one hand, this ensures the cooling effect of the coolant in the coolant tank on the workpiece, and on the other hand, it prevents the coolant in the coolant tank from overflowing, which helps to eliminate safety hazards when using the device.

[0019] (7) A liquid level detection unit is installed in the coolant tank to realize real-time monitoring of the amount of coolant entering the coolant tank, which helps to realize automatic control of the amount of coolant entering the coolant tank and improves the quality of the device.

[0020] (8) By setting a temperature detection unit and a control unit at the liquid storage tank, and enabling the control unit to keep the coolant in the liquid storage tank at a temperature not lower than the preset temperature based on the detection of the temperature detection unit, the constant temperature function of the liquid storage tank can be realized, and the supply of coolant can be guaranteed during the operation of the device, which helps to improve the quality of the device. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the component forming apparatus described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Stamping dies; 11. Upper mold; 12. Lower mold; 13. Coolant tank; 14. Molding structure; 15. Cooling channel; 16. Liquid level detection unit; 2. Liquid storage tank; 21. Heating module; 22. Temperature detection unit; 23. Control unit; 3. Piping; 4. Coolant pump. Detailed Implementation

[0022] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0024] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0026] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0028] The embodiments of this application provide a part forming apparatus, which is suitable for hot stamping forming of galvanized steel sheet parts, and is particularly suitable for hot stamping forming of galvanized steel sheets of unequal thickness. At the same time, the part forming apparatus, through its innovative structural design, also helps to ensure the hot stamping forming quality of galvanized steel sheet parts.

[0029] In related technologies, when hot stamping galvanized steel sheet parts, the galvanized steel sheet is generally heated to above 900°C, which causes the internal structure of the steel sheet to transform from ferrite, pearlite, cementite and other structures to austenite structure. Then stamping is performed. Since the zinc layer is in a liquid state at this time, the liquid zinc enters the austenite grain boundary of the steel sheet and diffuses along the grain boundary, which will cause austenite embrittlement.

[0030] In this situation, if the steel plate is hot-stamped, the steel plate will deform under tensile load, which will easily lead to brittle fracture. Microcracks of tens or even hundreds of micrometers can be observed on its surface, making it difficult to guarantee the stamping quality of galvanized steel plate parts.

[0031] Furthermore, during the hot stamping of galvanized steel sheet parts, especially for unequal thickness steel sheets, the thicker parts of the steel sheet are prone to insufficient strength due to the cooling rate not meeting the martensitic transformation rate requirements. This also affects the stamping quality of the galvanized steel sheet parts.

[0032] In view of this, in order to overcome the shortcomings of the related technology, the part forming apparatus of this embodiment combines... Figure 1 As shown, the overall design includes a stamping die 1 with an upper die 11 and a lower die 12, and a liquid storage tank 2 equipped with a heating module 21.

[0033] The lower mold 12 is provided with a coolant tank 13, and the forming structure 14 for forming the part on the lower mold 12 is located in the coolant tank 13. Cooling channels 15 for cooling the part are also provided in the lower mold 12 and the upper mold 11 respectively.

[0034] In addition, the liquid storage tank 2 is connected to the coolant tank 13 through the pipe 3. A coolant pump 4 is also installed on the pipe 3. The heated coolant in the liquid storage tank 2 can enter the coolant tank 13 through the coolant pump 4, and the coolant entering the coolant tank 13 can also flow back to the liquid storage tank 2 through the coolant pump 4.

[0035] Therefore, as described above, by setting up a liquid storage tank 2 with a heating module 21, and by allowing the heated coolant in the liquid storage tank 2 to enter the coolant tank 13 via the coolant pump 4, this embodiment can pre-cool and treat the zinc layer of the heated galvanized steel sheet part by using the coolant entering the coolant tank 13, based on the cooling of the upper die 11 and lower die 12 in the stamping die 1 through the cooling channels 15. This can effectively prevent brittle fracture of the galvanized steel sheet part during hot stamping, thereby ensuring the hot stamping forming quality of the galvanized steel sheet part.

[0036] Based on the above general introduction, it is worth noting that the stamping die 1 of this embodiment can be structurally based on existing hot stamping forming dies. The main difference between the stamping die 1 of this embodiment and existing hot stamping forming dies is the setting of the coolant tank 13 on the lower die 12.

[0037] At this point, in specific implementation, it should continue to be combined with Figure 1 As shown, the coolant tank 13 can generally be a rectangular tank, and multiple steel plates can be fixedly installed on the top of the lower mold 12 to form an open-top coolant tank 13 by splicing the multiple steel plates on the upper surface of part of the lower mold 12.

[0038] Each steel plate can be welded to the mold base in the lower mold 12, and the steel plates are also welded together to ensure good sealing of the formed coolant tank 13. Furthermore, when structures such as a part ejection mechanism are provided in the lower mold 12, appropriate sealing structures (such as high-temperature resistant sealing rings) can be installed at the part ejection mechanism and other locations to reduce coolant leakage. Of course, for some unavoidable leaks, the coolant in the reservoir 2 can be replenished periodically to ensure sufficient coolant levels.

[0039] After the coolant tank 13 is formed on the lower die 12 using multiple steel plates, the forming structure 14 on the lower die 12 is located in the coolant tank 13. It is also worth noting that the forming structure 14 is the core forming module such as the punch and die in the stamping die 1. In some embodiments, a detachable insert is also provided in the forming structure 14. The insert and the punch or die together form the overall forming structure 14.

[0040] See also Figure 1As shown, in the stamping die 1, the forming structure 14 on the upper die 11 is usually a punch, and correspondingly, the forming structure 14 on the lower die 12 is a die. Furthermore, based on the provision of a coolant tank 13, the forming structure 14 using the die is generally set in the conventional arrangement of existing stamping dies, so that the stamping forming of galvanized steel sheet parts can be achieved when the die is closed.

[0041] In this embodiment, as follows... Figure 1 As shown, in some exemplary embodiments, the cooling channels 15 in the upper mold 11 and the lower mold 12 can be specifically configured as multiple groups, each group of cooling channels 15 is used to cool different positions of the workpiece, and in the multiple groups of cooling channels 15 in the upper mold 11 and the lower mold 12, at least one group of cooling channels 15 has a different cooling capacity for the workpiece than the other groups of cooling channels 15.

[0042] In this way, by making the cooling channels 15 in the upper mold 11 and the lower mold 12 into multiple sets that cool different positions of the workpiece, and by making the cooling channels 15 have different cooling capacities for the workpiece, it can be understood that the differentiated design of the cooling capacity of each set of cooling channels 15 in the upper mold 11 and the lower mold 12 can be used to well adapt to the cooling requirements of hot forming of galvanized steel sheets of unequal thickness.

[0043] Therefore, during hot stamping, this embodiment can ensure that all areas of different thicknesses of the galvanized steel sheet can reach a sufficient cooling rate, enabling martensitic phase transformation at various locations of the galvanized steel sheet. This avoids brittle fracture of the galvanized steel sheet and, by utilizing the full martensitization of the galvanized steel sheet, further guarantees the overall strength of the formed galvanized steel sheet parts, thus improving the stamping quality of the galvanized steel sheet parts.

[0044] It is worth noting that, in specific implementations, the cooling channels 15 located in the upper mold 11 and lower mold 12 can also be based on the relevant structural settings in existing hot stamping molds, and will not be elaborated further here. Moreover, in some exemplary embodiments, the cooling capacity of the aforementioned set of cooling channels 15 is different from that of other sets of cooling channels 15. For example, this may include the arrangement density of the channels in this set of cooling channels 15, or the distance between the channels and the forming surface of the forming structure 14 used for forming the part is different from that of other sets of cooling channels 15.

[0045] Thus, by adjusting the arrangement density of the channels in the cooling channel 15 and the distance between the channels and the molding surface of the molding structure 14, a group of cooling channels 15 can have different cooling capacities than other groups of cooling channels 15. Obviously, this not only enables differentiated design of the cooling capacities of the cooling channels 15 in the upper mold 11 and the lower mold 12, but also has advantages such as simple structure and ease of design and implementation.

[0046] In practical implementation, based on the above, the cooling channels 15 in the upper mold 11 and lower mold 12 are arranged in groups, and each group of cooling channels 15 can be arranged according to the thickness of each position of the galvanized steel sheet part to be formed. At the same time, the arrangement density of the channels in the cooling channels 15 is different, for example, the distribution area of ​​the channels per unit area can be different, and this distribution area can be adjusted by changing the orifice diameter or number of the channels. The distance between the channels and the forming surface of the forming structure 14 can be adjusted by changing the design position of the channels on the upper mold 11 or lower mold 12.

[0047] In this embodiment, it should be noted that, in specific implementation, in addition to setting multiple sets of cooling channels 15 in both the upper mold 11 and the lower mold 12, the cooling capacity of each set of cooling channels 15 in the upper mold 11 and the lower mold 12 is designed differently. Of course, if the cooling requirements of the galvanized steel sheet parts are met (for example, the thickness difference between different positions of the steel sheet is small), it is also possible to differentiate the cooling capacity of each set of cooling channels 15 in the upper mold 11 or the lower mold 12. Preferably, the cooling capacity of each set of cooling channels 15 in the lower mold 12 can be differentiated.

[0048] In addition to setting the arrangement density of the cooling channels in the cooling channel 15 or the distance between the channels and the molding surface of the molding structure 14 to achieve differentiation in the cooling capacity of different groups of cooling channels 15, it is also feasible to set both the arrangement density of the cooling channels in the cooling channel 15 and the distance between the channels and the molding surface of the molding structure 14 in a specific implementation.

[0049] In addition, it should be noted that, besides designing the flow channel arrangement density and the distance between the flow channel and the molding surface of the molding structure 14, in specific implementation, those skilled in the art can also achieve differentiated design of cooling capacity of different groups of cooling flow channels 15 through other feasible methods, and this embodiment does not limit this.

[0050] Meanwhile, in specific implementation, the number of cooling channels 15 with differentiated designs and the degree of differentiation between different cooling channels 15 can be set according to the thickness of each position of the galvanized steel sheet with unequal thickness and the cooling requirements determined based on the sheet thickness, which will not be elaborated here.

[0051] In this embodiment, in some exemplary implementations, it is still as follows Figure 1 As shown, the liquid storage tank 2 and the coolant tank 13 can be connected, for example, through a single pipe 3, and the coolant pump 4 is also a bidirectional coolant pump connected in series in the pipe 3.

[0052] At this point, the liquid storage tank 2 and the coolant tank 13 are connected by a single pipe 3, and the coolant pump 4 is a bidirectional coolant pump connected in series in the pipe 3. It can be understood that this can reduce the number of pipes 3 and coolant pump 4, which helps to reduce the cost of the device's components and also helps to reduce the cost of modifying existing stamping dies, thus facilitating the promotion and application of the device.

[0053] In this embodiment, in some exemplary implementations, the pipe 3 may be a flexible hose. Using a flexible hose for the pipe 3 not only facilitates the connection between the pipe 3 and the liquid storage tank 2 and the coolant tank 13, but also facilitates the arrangement of the pipe 3 at the stamping die 1.

[0054] In practice, one end of the pipe 3 can be connected to the side of the reservoir 2, and the other end of the pipe 3 can be connected to the bottom of the coolant tank 13. If conditions permit, it is also possible to connect the pipe 3 to the side of the coolant tank 13.

[0055] When pipe 3 uses a flexible hose, existing high-temperature resistant flexible hose products can be used. The end of pipe 3 can generally be pre-attached to a connector, and then connected to the reservoir 2 and coolant tank 13 via screws or other methods. Alternatively, the end of pipe 3 can be directly connected to the connector located at the reservoir 2 and coolant tank 13. Since pipe 3 uses a flexible hose, the connection between pipe 3 and the connector can be achieved, for example, using a clamp.

[0056] In this embodiment, when the coolant pump 4 is a bidirectional coolant pump connected in series in the pipeline 3, an existing high-temperature resistant bidirectional pump product can be used. Meanwhile, combined with... Figure 1 As shown, in a specific implementation, the coolant pump 4 can be fixed on a mounting base for supporting the coolant tank 2, which not only achieves a stable arrangement of the coolant pump 4, but also allows the pipeline 3 to use a flexible hose.

[0057] However, it is worth noting that in specific implementations, besides making pipe 3 a single unit and using a bidirectional coolant pump 4 connected in series in pipe 3, other implementations may also include two pipes 3, or pipe 3 having parallel inlet and return branches. Correspondingly, two coolant pumps 4 may be used, each comprising a first pump to transport the heated coolant from the reservoir 2 to the coolant tank 13, and a second pump to return the coolant entering the coolant tank 13 to the reservoir 2. These are also feasible implementations.

[0058] When there are two coolant pumps 4 located on different pipes 3 or different branches of pipe 3, in order to ensure the normal operation of the device, control valves (not shown in the figure) can generally be installed in each pipe 3 or each branch of pipe 3. When the coolant pump 4 is turned on, the control valve located on the same pipe 3 or branch as the turned-on coolant pump 4 also turns on. When the coolant pump 4 is turned off, the control valve located on the same pipe 3 or branch as the turned-off coolant pump 4 closes synchronously.

[0059] It should be noted that, except when there are two coolant pumps 4, control valves can be installed in pipe 3 or branches corresponding to each coolant pump 4. Of course, in specific implementations, when pipe 3 is a single line and the coolant pump 4 is a bidirectional coolant pump connected in series in pipe 3, control valves can also be installed in pipe 3 to achieve better on / off control of pipe 3. All control valves can be existing conventional valves, such as electrically controlled shut-off valves. Taking pipe 3 as an example using a flexible hose, pipe 3 and control valves can be fixedly connected by clamps. The control valves can also be fixedly arranged on the mounting base of the reservoir 2, or fixedly installed at the reservoir 2.

[0060] In this embodiment, in some exemplary implementations, the depth of the coolant tank 13 can be specifically set such that when the coolant entering the coolant tank 13 reaches a preset working level, the coolant can completely cover the workpiece, and the preset working level is numerically less than the depth of the coolant tank 13.

[0061] At this time, the depth of the coolant tank 13 is set so that the coolant can completely cover the workpiece when it reaches the preset working level, and the preset working level is numerically less than the depth of the coolant tank 13. Obviously, this can ensure the cooling effect of the coolant in the coolant tank 13 on the workpiece, and also prevent the coolant in the coolant tank 13 from overflowing, which helps to eliminate safety hazards when using the device.

[0062] In addition, in specific implementation, the above-mentioned preset working liquid level can be, for example, a liquid level that ensures the distance between the coolant level and the highest point of the workpiece is ≥10mm. The above-mentioned preset working liquid level is numerically less than the depth of the coolant tank. For example, the difference between the preset working liquid level and the depth of the coolant tank 13 can be ≥30 (in mm). Furthermore, those skilled in the art can set the above-mentioned preset working liquid level according to specific circumstances, as long as it meets the above-mentioned requirements for covering the workpiece and the safety requirements when the device is working.

[0063] In this embodiment, in some exemplary implementations, a liquid level detection unit 16 may be installed in the coolant tank 13. This liquid level detection unit 16 can be an existing high-temperature resistant liquid level detection device, and its arrangement should avoid interference with the molding structure 14 in the upper and lower molds. Furthermore, in specific implementations, the liquid level detection unit 16 may be connected to the start / stop control section of the coolant pump 4 (e.g., the control unit 23 described below), so that when the coolant in the coolant tank 13 reaches a preset working level, the coolant pump 4 is shut off to stop the flow of coolant into the coolant tank 13.

[0064] It is understandable that by setting a liquid level detection unit 16 in the coolant tank 13, it is possible to monitor the amount of coolant entering the coolant tank 13 in real time, which helps to achieve automatic control of the amount of coolant entering the coolant tank 13 and improves the quality of the device.

[0065] In this embodiment, please continue to refer to... Figure 1 As shown, in some exemplary embodiments, a temperature detection unit 22 and a control unit 23 connected to the temperature detection unit 22 and the heating module 21 may be provided at the liquid storage tank 2.

[0066] The control unit 23 is used to turn the heating module 21 on and off, and the control unit 23 is also specifically configured to keep the coolant in the storage tank 2 at a temperature not lower than a preset temperature under the detection of the temperature detection unit 22.

[0067] In this way, by setting a temperature detection unit 22 and a control unit 23 at the liquid storage tank 2, and enabling the control unit 23 to keep the coolant in the liquid storage tank 2 at a temperature not lower than the preset temperature based on the detection of the temperature detection unit 22, this embodiment can achieve the constant temperature function of the liquid storage tank 2, which can ensure the supply of coolant during the cyclic operation of the device, and thus help improve the quality of use of the device.

[0068] In practice, it is worth noting that the temperature detection unit 22 can be any existing high-temperature resistant temperature detection device, and the control unit 23 can be any existing control module such as a microcontroller.

[0069] Meanwhile, for the hot forming of galvanized steel sheet parts, the preset temperature can generally be 95°C. Based on the detection of the temperature detection unit 22, the control unit 23 keeps the coolant in the storage tank 2 at a temperature not lower than the preset temperature. It can also adopt the PID (Proportional Integral Derivative) closed-loop control method that is widely used in the prior art.

[0070] In this embodiment, it should be noted that, in specific implementation, the liquid storage tank 2 can be structurally improved by using insulation materials or by setting an insulation layer to achieve better insulation performance, thereby reducing energy waste caused by heat loss. Furthermore, the liquid storage capacity of the liquid storage tank 2 should generally be greater than the maximum inflow capacity of the coolant tank 13 (the coolant level in the coolant tank 13 should not be lower than the preset working level) to ensure saturation of the coolant tank 13 and to compensate for coolant evaporation.

[0071] Furthermore, in this embodiment, the coolant can generally be water (usually deionized water) or an aqueous solution (such as ethylene glycol aqueous solution).

[0072] It is worth noting that, regarding the part forming apparatus of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figure 1 As shown, it may include, for example, a stamping die 1 having an upper die 11 and a lower die 12, and a liquid storage tank 2 having a heating module 21.

[0073] The lower mold 12 is equipped with a coolant tank 13, and the molding structure 14 on the lower mold 12 is located in the coolant tank 13. Cooling channels 15 are respectively provided in the lower mold 12 and the upper mold 11. The storage tank 2 is connected to the coolant tank 13 through a pipe 3. A coolant pump 4 is provided on the pipe 3. The heated coolant in the storage tank 2 can enter the coolant tank 13 through the coolant pump 4, and the coolant entering the coolant tank 13 can also flow back to the storage tank 2 through the coolant pump 4.

[0074] The upper mold 11 and the lower mold 12 contain multiple sets of cooling channels 15. Each set of cooling channels 15 is used to cool different parts of the workpiece. In addition, among the multiple sets of cooling channels 15, at least one set of cooling channels 15 has a different cooling capacity for the workpiece than the other sets of cooling channels 15.

[0075] Furthermore, the liquid storage tank 2 and the coolant tank 13 are connected by a single pipe 3, which is a flexible hose. The coolant pump 4 is also a bidirectional coolant pump connected in series in the pipe 3. Meanwhile, the depth of the coolant tank 13 is set such that when the coolant entering the coolant tank 13 reaches a preset working level, the coolant can completely cover the workpiece, and the preset working level is numerically less than the tank depth. A liquid level detection unit 16 is also installed inside the coolant tank 13.

[0076] In addition, a temperature detection unit 22 and a control unit 23 are provided at the liquid storage tank 2. The control unit 23 controls the heating module 21 to open and close, and under the detection of the temperature detection unit 22, the control unit 23 can keep the coolant in the liquid storage tank 2 at a temperature not lower than the preset temperature.

[0077] In the preferred embodiment of the above-mentioned part forming apparatus, the specific configuration and arrangement of the coolant tank 13, the liquid storage tank 2, the pipeline 3, the coolant pump 4, etc. can still be referred to the descriptions in the above-mentioned exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the coolant tank 13, the liquid storage tank 2, the pipeline 3, and the coolant pump 4, etc., can also be referred to the descriptions in the above-mentioned exemplary embodiments.

[0078] Taking the forming device in the preferred embodiment as an example, in specific operation, that is, when hot stamping forming of galvanized steel sheet, the galvanized steel sheet to be formed is first heated in an external heating furnace. At the same time, the coolant pump 4 works to send the coolant heated to not less than 95°C in the storage tank 2 into the coolant tank, so that the sent coolant can reach the preset working level.

[0079] Then, using an automated gripper, the part is transferred to the coolant tank 13 on the lower die 12 of the stamping die 1 and placed on the forming structure 14 in the lower die 12. At this time, the cooling channels 15 in the upper die 11 and lower die 12 of the stamping die 1 have started circulating cooling water. Thus, the galvanized steel sheet part immersed in the coolant in the coolant tank 13 can be cooled to above the martensitic transformation temperature in a very short time under the direct cooling of the coolant and the indirect cooling of the cooling channels 15, and the zinc layer on the surface of the part also changes from a liquid state to a molten state.

[0080] Next, the coolant pump 4 is controlled to reverse its operation via the control unit 23 (for example, it can be automatically controlled by a timer, or it can be triggered by a worker), causing the coolant in the coolant tank 13 to flow back to the storage tank 2. After the coolant in the coolant tank 13 has completely flowed back, the upper mold 11 begins to descend for mold closing.

[0081] After the upper mold 11 and the lower mold 12 are closed, the workpiece is cooled by the cooling channels 15 in the upper mold 11 and the lower mold 12, so as to achieve rapid quenching of the workpiece and cool it to the martensitic structure. The differentiated setting of the cooling channels 15 can also ensure that the thicker area in the workpiece with unequal thickness reaches a sufficient cooling rate and completes the full martensitic transformation.

[0082] After the stamping process is completed, the upper die 11 rises and opens, and the workpiece can be removed using an automated gripper. At the same time, during the closing process of the stamping die 1, the coolant flowing back into the storage tank 2 can be reheated by the heating module 21 to prepare for the next work cycle.

[0083] The part forming apparatus of this embodiment adopts the above design. By setting up a liquid storage tank 2 with a heating module 21, the heated coolant in the liquid storage tank 2 can enter the coolant tank 13 through the coolant pump 4. At the same time, the cooling channel 15 in the stamping die 1 adopts a differentiated design. It can not only cool the galvanized steel sheet part in the cooling channel 15 in the die, but also use the coolant entering the coolant tank 13 to pre-cool and treat the zinc layer. This can effectively avoid brittle fracture of the galvanized steel sheet part during hot stamping. At the same time, it can also meet the cooling rate requirements of the thicker area of ​​the galvanized steel sheet part with different thicknesses. This is beneficial to ensuring the hot stamping forming quality of the galvanized steel sheet part and has good practicality.

[0084] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A part forming apparatus, suitable for hot stamping forming of galvanized steel sheet parts, characterized in that: It includes a stamping die (1) having an upper die (11) and a lower die (12), and a liquid storage tank (2) having a heating module (21); The lower mold (12) is provided with a coolant tank (13), and the forming structure (14) for forming the part on the lower mold (12) is located in the coolant tank (13). The lower mold (12) and the upper mold (11) are respectively provided with cooling channels (15) for cooling the part. The storage tank (2) is connected to the coolant tank (13) through a pipeline (3). A coolant pump (4) is provided on the pipeline (3). The heated coolant in the storage tank (2) can enter the coolant tank (13) through the coolant pump (4), and the coolant in the coolant tank (13) can flow back to the storage tank (2) through the coolant pump (4).

2. The part forming apparatus according to claim 1, characterized in that: The cooling channels (15) in the upper mold (11) and / or the lower mold (12) are in multiple groups, and each group of cooling channels (15) is used to cool different positions of the part. Of the multiple sets of cooling channels (15), at least one set of cooling channels (15) has a different cooling capacity for the workpiece than the other sets of cooling channels (15).

3. The part forming apparatus according to claim 2, characterized in that: The cooling capacity of one group of cooling channels (15) differs from that of other groups of cooling channels (15), including the arrangement density of the channels in the group of cooling channels (15), and / or the distance between the channels and the molding surface of the molding structure (14) used for forming the part is different from that of other groups of cooling channels (15).

4. The part forming apparatus according to claim 1, characterized in that: The liquid storage tank (2) and the coolant tank (13) are connected by a single pipe (3), and the coolant pump (4) is a bidirectional coolant pump connected in series in the pipe (3).

5. The part forming apparatus according to claim 4, characterized in that: The pipeline (3) is made of flexible hose.

6. The part forming apparatus according to claim 1, characterized in that: The depth of the coolant tank (13) is set such that when the coolant entering the coolant tank (13) reaches a preset working level, the coolant can completely cover the component, and the preset working level is numerically less than the depth of the tank.

7. The part forming apparatus according to claim 6, characterized in that: The coolant tank (13) is equipped with a liquid level detection unit (16).

8. The part forming apparatus according to any one of claims 1 to 7, characterized in that: The liquid storage tank (2) is provided with a temperature detection unit (22) and a control unit (23) connected to the temperature detection unit (22) and the heating module (21). The control unit (23) is used to turn the heating module (21) on and off, and the control unit (23) is configured to keep the coolant in the storage tank (2) at a temperature not lower than a preset temperature under the detection of the temperature detection unit (22).

Images