Material box blowing method and system for powder metallurgy

Abstract

The invention discloses a material box blowing method and system for powder metallurgy. The method comprises the steps that a material box blowing device is moved to the position above a lower die of a die, powder is fed into the lower die of the die from a feeding pipeline in proportion, the lower die of the die is vibrated, the powder is evenly filled, and then the material box blowing device is reset; the upper mold and the lower mold are controlled to be closed, so that the powder in the lower mold is pressed and formed, and then a bottom plate of the lower mold drives a formed part to move upwards; and according to a preset pressure curve, the main pipeline is pressurized, so that airflow is output from the auxiliary air hole channels to blow the formed part to a preset material receiving area. Non-contact discharging of formed parts is achieved, the influence of mechanical stress on the formed parts is eliminated, the quality of finished products is guaranteed, damage to the lower die is avoided, and the service life of the lower die is prolonged. And the main pipeline and the auxiliary air hole channels are adopted, it is guaranteed that airflow pressure borne by the formed part is uniform and stable, and therefore the forming quality of the formed part is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of powder metallurgy, and in particular, to a method and system for blowing materials in a cartridge for powder metallurgy. Background Art

[0002] Powder metallurgy is a process in which metal powders and the like are placed in a mold and pressed into shape, and then transferred to a sintering furnace for high-temperature sintering to produce a final product. Currently, the transfer of the formed part is usually a contact transfer. Specifically, after the powder is pressed into the desired shape in the mold, the formed part needs to be pushed flat onto the conveyor belt by a shovel plate, and then conveyed by the conveyor belt to the sintering furnace for heat treatment. However, when the shovel plate pushes the formed part flat, since the shovel plate is in direct contact with the lower die of the mold, the long-term reciprocating movement of the shovel plate is likely to scratch the lower die of the mold, resulting in frequent replacement of the lower die; and the shovel plate is likely to cause mechanical stress impact on the densified surface of the formed part, resulting in microcracks or deformation in the metallurgical finished product, thereby causing the performance of the finished product not to meet the product requirements. Summary of the Invention

[0003] The present application provides a method and system for blowing materials in a cartridge for powder metallurgy to solve the technical problems that the current discharging method for press forming is likely to damage the lower die and damage the formed part.

[0004] To solve the above technical problems, in a first aspect, an embodiment of the present application provides a method for powder pressing and forming for powder metallurgy, which is applied to a press forming device. The press forming device includes an upper die of the mold, a lower die of the mold, and a cartridge blowing device. The cartridge blowing device includes a feeding pipeline and a blowing pipeline. The blowing pipeline includes a main pipeline and a plurality of secondary air hole channels. The method includes:

[0005] Moving the cartridge blowing device above the lower die of the mold, feeding powder into the lower die of the mold from the feeding pipeline in proportion, vibrating the lower die of the mold to make the powder evenly filled, and then resetting the cartridge blowing device;

[0006] Controlling the upper die of the mold and the lower die of the mold to close the mold to press and form the powder in the lower die of the mold, and then driving the formed part to move upward through the bottom plate of the lower die of the mold;

[0007] Pressurizing the main pipeline according to a preset pressure curve to output air flow from a plurality of the secondary air hole channels to blow the formed part to a preset receiving area.

[0008] In some of the embodiments, the pressurizing the main pipeline according to a preset pressure curve includes:

[0009] Determining the preset pressure curve corresponding to the powder type of the formed part, where the preset pressure curve includes a pre-press stage curve and a fast pressurization stage curve;

[0010] Pressurize and blow air into the main pipeline at a preset pressurization rate according to the pre-pressurization stage curve until a first air flow pressure value is reached, so that the air flow output from multiple auxiliary air channels blows the formed part to start moving;

[0011] According to the fast pressurization stage curve, rapidly increase the air blowing pressure of the main pipeline to a second air flow pressure value at a first pressurization acceleration, and keep the air blowing pressure of the main pipeline at the second air flow pressure value for a preset pressurization duration, so that the air flow output from multiple auxiliary air channels increases the moving speed of the formed part.

[0012] In some embodiments, the first air flow pressure value is:

[0013]

[0014] Wherein, P1 is the first air flow pressure value of the main pipeline, K is the pressure conversion rate between the air flow in the main pipeline and the auxiliary air channels, μ is the static friction coefficient between the formed part and the bottom plate of the lower die of the mold, m is the mass of the formed part, g is the acceleration due to gravity, S is the force-bearing area of the formed part under the action of the air flow, and P' is a preset constant.

[0015] In some embodiments, the preset pressure curve further includes a slow pressurization stage curve. Pressurizing the main pipeline according to the preset pressure curve further includes:

[0016] According to the slow pressurization stage curve, slowly increase the air blowing pressure of the main pipeline to a third air flow pressure value at a second pressurization acceleration, so that the air flow output from multiple auxiliary air channels keeps the moving speed of the formed part, and the first pressurization acceleration is greater than the second pressurization acceleration.

[0017] In some embodiments, the second pressurization acceleration is:

[0018]

[0019] Wherein, a2 is the second pressurization acceleration, P3 is the third air flow pressure value, P2 is the second air flow pressure value, K is the pressure conversion rate between the air flow in the main pipeline and the auxiliary air channels, k is the attenuation coefficient of the air flow pressure affected by the distance, d is the air flow attenuation distance, v2 is the pressurization tail speed of the fast pressurization stage curve, and t is the pressurization time.

[0020] In some embodiments, the press-forming device further includes a vision sensor, and the vision sensor is used to identify whether the formed part enters the preset material receiving area during the output of the air flow from the auxiliary air channels.

[0021] In some of these embodiments, the cartridge blowing device further includes a material storage component provided with a material storage tank. The material storage component is disposed below the main body of the cartridge blowing device, and the material storage tank is located below the discharge port of the feed pipe.

[0022] Second, an embodiment of the present application further provides a powder pressing and forming system for powder metallurgy, which is applied to a pressing and forming device. The pressing and forming device includes an upper die of the mold, a lower die of the mold, and a cartridge blowing device. The cartridge blowing device includes a feed pipe and a blowing pipe. The blowing pipe includes a main pipe and a plurality of secondary air hole channels. The system includes:

[0023] A feed control module, configured to move the cartridge blowing device above the lower die of the mold, send powder into the lower die of the mold from the feed pipe in proportion, vibrate the lower die of the mold to make the powder evenly filled, and then reset the cartridge blowing device;

[0024] A pressing control module, configured to control the upper die of the mold and the lower die of the mold to close the mold, so as to press and form the powder in the lower die of the mold, and then drive the formed part to move upward through the bottom plate of the lower die of the mold;

[0025] A discharge control module, configured to pressurize the main pipe according to a preset pressure curve, so as to output air flow from the plurality of secondary air hole channels to blow the formed part to a preset material receiving area.

[0026] Third, an embodiment of the present application further provides a pressing and forming device, including a processor and a memory. The memory is used to store a computer program, and when the computer program is executed by the processor, it implements the powder pressing and forming method for powder metallurgy as described above.

[0027] Fourth, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it implements the powder pressing and forming method for powder metallurgy as described above.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] By providing a blowing pipe in the cartridge blowing device and cooperating with a preset pressure curve to blow the formed part, non-contact discharging of the formed part is achieved, mechanical stress on the formed part is eliminated, the quality of the finished product is guaranteed, and the lower die will not be damaged, thereby improving the service life of the lower die; and the blowing pipe includes a main pipe and a plurality of secondary air hole channels, which can make the air flow more uniform and stable, ensure that the formed part is uniformly stressed by the air flow, and thus ensure the forming quality of the formed part. Description of the Drawings

[0030] Figure 1Schematic flow chart of the powder pressing and forming method for powder metallurgy shown in the embodiments of the present application;

[0031] Figure 2 Schematic structural view of one perspective of the cartridge blowing device shown in the embodiments of the present application;

[0032] Figure 3 Schematic structural view of another perspective of the cartridge blowing device shown in the embodiments of the present application;

[0033] Figure 4 Block diagram of the structure of the powder pressing and forming system for powder metallurgy shown in the embodiments of the present application;

[0034] Figure 5 Block diagram related to the control of the pressing and forming equipment shown in the embodiments of the present application. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0036] As recorded in the background art, the transfer of the formed part is usually contact transfer. The powder is placed in the lower die of the mold, the upper and lower dies of the mold are controlled to close, so as to press and form the powder, then the upper die returns to its original position, the lower die pushes the formed part upward, and then the formed part is horizontally pushed to the conveyor belt by a shovel plate, and then conveyed to the sintering furnace by the conveyor belt. However, the long-term friction between the shovel plate and the lower die is likely to cause damage to the lower die, and the damage to the lower die will affect the quality of die closing, so the lower die needs to be frequently replaced; at the same time, since there is a certain distance from the formed part to the receiving area, the shovel plate must give the formed part sufficient impact force to make the formed part move forward. Therefore, when the shovel plate acts on the surface of the formed part, the surface of the formed part is easily impacted by mechanical stress and micro-cracks or micro-deformations appear. For this reason, in the present application, the formed part is blown to the receiving area through a blowing pipeline, realizing non-contact discharging, eliminating the adverse effects of the shovel plate, and ensuring the quality of the finished product.

[0037] Please refer to Figure 1 , Figure 1 which is a schematic flow chart of a powder pressing and forming method for powder metallurgy provided by an embodiment of the present application. The powder pressing and forming method for powder metallurgy in the embodiments of the present application can be applied to a pressing and forming device, and the pressing and forming device includes an upper die of the mold, a lower die of the mold and a cartridge blowing device. As Figure 2 shown, the cartridge blowing device includes a feeding pipeline 11 and a blowing pipeline 12, and the blowing pipeline 12 includes a main pipeline 121 and a plurality of sub-air hole channels 122. As Figure 1As shown in the figure, the powder pressing and forming method for powder metallurgy in this embodiment includes steps S101 to S103, which are described in detail as follows:

[0038] Step S101: Move the cartridge blowing device above the lower die of the mold, feed powder into the lower die of the mold proportionally from the feed pipe, vibrate the lower die of the mold to make the powder evenly filled, and then reset the cartridge blowing device.

[0039] In this step, the feed pipe can have multiple feed ports to meet the need of producing multiple formed parts at one time. The pressing and forming equipment controls the cartridge blowing device to move above the lower die of the mold according to a preset movement control program, so that the discharge port of the feed pipe is aligned with the die orifice of the lower die of the mold, so that the powder can enter the mold cavity of the lower die along the feed pipe, and then controls the lower die of the mold to vibrate to make the powder evenly filled. Finally, the cartridge blowing device is reset. At this time, the orifice of the auxiliary air duct of the blowing pipe faces upward above the lower die of the mold, that is, the position where the formed part is ejected from the lower die, so as to facilitate aligning and blowing the formed part to the receiving area.

[0040] Optionally, as Figure 3 shown, the cartridge blowing device further includes a storage component 13. The storage component 13 is provided with a storage tank 131. The storage component 13 is arranged below the main body of the cartridge blowing device, and the storage tank 131 is located below the discharge port of the feed pipe.

[0041] In this optional embodiment, the storage component is detachably connected to the cartridge blowing device, so as to facilitate the replacement of the damaged storage component during later maintenance; at the same time, the storage component has an increased storage space. The powder can be first fed into the discharge tank of the storage component. When the cartridge blowing device moves, it drives the storage component to move along the surface of the lower die platform of the mold, and finally the powder in the storage tank naturally falls into the mold cavity of the lower die, improving the filling efficiency and thus the production efficiency.

[0042] Step S102: Control the upper die of the mold and the lower die of the mold to close the mold, so as to press and form the powder in the lower die of the mold, and then drive the formed part to move upward through the bottom plate of the lower die of the mold.

[0043] In this step, after the upper die and the lower die of the mold are closed, the powder is pressed into a formed part with a smooth surface and a dense structure. The formed part is similar to biscuits, etc. Although it has been formed, it will still break when subjected to impact force. The bottom of the mold cavity of the lower die of the mold is a bottom plate, and this bottom plate moves upward to drive the formed part to move upward to be flush with the die orifice of the lower die or slightly higher than the die orifice of the lower die.

[0044] Step S103: Pressurize the main pipeline according to a preset pressure curve to output air flow from multiple auxiliary air holes to blow the formed part to a preset material collection area.

[0045] In this step, since an excessive air flow acting on the surface of the formed part due to the blowing method may damage the formed part, and a too small air flow cannot push the formed part, the present application performs multi-stage pressurized blowing according to a preset pressure curve and uses multiple auxiliary air holes to make the air flow more uniform and stable, thereby ensuring the quality of the formed part.

[0046] Optionally, the compression molding device further includes a vision sensor, which is used to identify whether the formed part enters the preset material collection area during the output of air flow from the auxiliary air holes; when the formed part still does not enter the preset material collection area when the blowing of the auxiliary air holes is about to end, continue to pressurize the main pipeline to enable the auxiliary air holes to continue to blow the formed part to the preset material collection area, so as to ensure the completion of the material collection for each formed part.

[0047] In some embodiments, the pressurizing the main pipeline according to a preset pressure curve in step S103 includes:

[0048] Determine the preset pressure curve corresponding to the powder type of the formed part, and the preset pressure curve includes a pre-pressurization stage curve and a fast pressurization stage curve;

[0049] Pressurize and blow air into the main pipeline at a preset pressurization rate according to the pre-pressurization stage curve to a first air flow pressure value, so that the air flow output from multiple auxiliary air holes blows the formed part to start moving;

[0050] Rapidly increase the air blowing pressure of the main pipeline to a second air flow pressure value at a first pressurization acceleration according to the fast pressurization stage curve, and keep the air blowing pressure of the main pipeline at the second air flow pressure value for a preset pressurization duration, so that the air flow output from multiple auxiliary air holes increases the moving speed of the formed part.

[0051] In this embodiment, the pressurization process of the main pipeline is divided into a pre-pressurization stage and a fast pressurization stage. The pre-pressurization stage is the stage of blowing the formed part to start moving, and the fast pressurization stage is the process of increasing the moving speed of the formed part. Since the force-bearing situations of the formed parts corresponding to different powder types and formed part sizes are different. For example, the structure of the fine powder is denser than that of the coarse powder after pressing, and it can withstand greater forces. Moreover, the larger the force-bearing area of the formed part, the greater the force required. Therefore, multiple pressure curves are preset to meet the requirements of different powder types and formed part sizes.

[0052] In the preloading stage, the preset pressurization rate is the rising speed of the main pipeline pressure, which is greater than the sum of the pressure relief rates of multiple secondary air channels. And the preset pressurization rate can be a uniform pressurization rate or an accelerating pressurization rate, preferably an accelerating pressurization rate, so as to shorten the preloading stage and improve the overall blowing efficiency. Wherein the first air flow pressure value satisfies that the force received by the formed part can just break the static friction between the formed part and the bottom plate and start to move, so that the formed part starts to move in a stable posture, effectively avoiding situations such as the instantaneous impact force of the shovel plate on the formed part resulting in micro-cracks in the formed part.

[0053] Optionally, considering the static friction between the formed part and the bottom plate, the first air flow pressure value is:

[0054] P1 is the first air flow pressure value of the main pipeline, K is the pressure conversion rate between the air flows of the main pipeline and the secondary air channels, μ is the static friction coefficient between the formed part and the bottom plate of the lower die of the mold, m is the mass of the formed part, g is the acceleration due to gravity, S is the force-receiving area of the formed part affected by the air flow, and P′ is a preset constant.

[0055] Among them, the pressure conversion rate can be measured according to the actual situation of the main pipeline and the secondary air channels, the static friction coefficient can be tested in the static friction experiment between the formed part and the bottom plate, the force-receiving area can be preset according to the shape and size of the formed part, and the preset constant is the compensation amount for the air attenuation of the air flow, and this constant can be preset according to the empirical value.

[0056] In the fast acceleration stage, after the static friction is broken in the preloading stage, due to the inertial effect of the formed part itself, the air flow maintaining the uniform movement of the formed part is smaller than the pressure when breaking the static friction, so the formed part will have a short-distance accelerating movement. In order to improve the blowing efficiency, in this embodiment, the main pipeline is accelerated to pressurize to increase the moving speed of the formed part. Wherein the pressure of the air flow converted from the second air flow pressure value acting on the formed part through the secondary air channels does not exceed the pressure upper limit of the micro-cracks or micro-deformations of the formed part (this value is measured in the impact experiment).

[0057] In some embodiments, the preset pressure curve further includes a slow pressurization stage curve. Pressurizing the main pipeline according to the preset pressure curve in step S103 further includes:

[0058] Slowly increasing the blowing pressure of the main pipeline to the third air flow pressure value according to the slow pressurization stage curve, so that the air flows output by the multiple secondary air channels maintain the moving speed of the formed part, and the first pressurization acceleration is greater than the second pressurization acceleration.

[0059] In this embodiment, in some cases, the distance from the formed part to the material receiving area is relatively long. As a result, after the second air flow pressure value is reached in the fast acceleration stage, the air flow is affected by air attenuation over a long distance, causing the formed part to fail to reach the material receiving area as expected. Or in the case of pressing multiple formed parts at one time, there may be blockages in the discharge paths between the multiple formed parts. Therefore, in order to maintain the acting force on the formed part, the main pipeline is slowly accelerated and pressurized to offset the air attenuation of the air flow.

[0060] Optionally, the second pressurization acceleration is:

[0061] a2 is the second pressurization acceleration, P3 is the third air flow pressure value, P2 is the second air flow pressure value, K is the pressure conversion rate between the air flow in the main pipeline and the secondary air hole channels, k is the attenuation coefficient of the air flow pressure affected by the distance, d is the air flow attenuation distance, v2 is the pressurization tail speed of the fast pressurization stage curve, and t is the pressurization time.

[0062] Among them, the third air flow pressure value can be calculated based on the acting force to maintain the formed part and the pressure conversion rate. The attenuation coefficient can be obtained through experimental measurement. The air flow attenuation distance can be preset according to the actual distance. The pressurization tail speed is the speed at the end of the fast pressurization stage, and the pressurization time is a preset value.

[0063] It can be understood that since this application uses multiple feeding pipelines to realize the pressing and forming of multiple formed parts at one time, there will be no significant difference in the discharging efficiency compared with the traditional shovel discharging method during discharging, and the discharging quality can be significantly improved.

[0064] In order to execute the powder pressing and forming method for powder metallurgy corresponding to the above method embodiment to achieve the corresponding functions and technical effects. Refer to Figure 4 , Figure 4 shows a structural block diagram of a powder pressing and forming system for powder metallurgy provided by an embodiment of the present application. For the sake of convenience of description, only the parts related to this embodiment are shown. The powder pressing and forming system for powder metallurgy provided by the embodiment of the present application is applied to a pressing and forming device. The pressing and forming device includes an upper die of the mold, a lower die of the mold, and a material box blowing device. The material box blowing device includes a feeding pipeline and a blowing pipeline. The blowing pipeline includes a main pipeline and a plurality of secondary air hole channels. The system includes:

[0065] A feeding control module 401, configured to move the material box blowing device above the lower die of the mold, send the powder into the lower die of the mold from the feeding pipeline in proportion, vibrate the lower die of the mold to make the powder evenly filled, and then reset the material box blowing device;

[0066] The pressing control module 402 is used to control the upper die and the lower die of the mold to close the mold, so as to press and form the powder in the lower die of the mold, and then drive the formed part to move upward through the bottom plate of the lower die of the mold;

[0067] The discharging control module 403 is used to pressurize the main pipeline according to a preset pressure curve, so as to output air flow from a plurality of the auxiliary air hole channels to blow the formed part to a preset receiving area.

[0068] In some embodiments, the discharging control module 403 is specifically used for:

[0069] Determine the preset pressure curve corresponding to the powder type of the formed part, and the preset pressure curve includes a pre-pressing stage curve and a fast pressurization stage curve;

[0070] Pressurize and blow air into the main pipeline at a preset pressurization rate according to the pre-pressing stage curve until the first air flow pressure value, so that the air flow output from a plurality of the auxiliary air hole channels blows the formed part to start moving;

[0071] Rapidly increase the air blowing pressure of the main pipeline to the second air flow pressure value at a first pressurization acceleration according to the fast pressurization stage curve, and keep the air blowing pressure of the main pipeline at the second air flow pressure value for a preset pressurization duration, so that the air flow output from a plurality of the auxiliary air hole channels increases the moving speed of the formed part.

[0072] In some embodiments, the first air flow pressure value is:

[0073]

[0074] Wherein, P1 is the first air flow pressure value of the main pipeline, K is the pressure conversion rate between the air flow of the main pipeline and the auxiliary air hole channels, μ is the static friction coefficient between the formed part and the bottom plate of the lower die of the mold, m is the mass of the formed part, g is the acceleration due to gravity, S is the force-receiving area of the formed part under the action of the air flow, and P′ is a preset constant.

[0075] In some embodiments, the preset pressure curve further includes a slow pressurization stage curve, and the discharging control module 403 is specifically further used for:

[0076] Slowly increase the air blowing pressure of the main pipeline to the third air flow pressure value at a second pressurization acceleration according to the slow pressurization stage curve, so that the air flow output from a plurality of the auxiliary air hole channels keeps the moving speed of the formed part, and the first pressurization acceleration is greater than the second pressurization acceleration.

[0077] In some of these embodiments, the second pressurization acceleration is:

[0078]

[0079] Wherein, a2 is the second pressurization acceleration, P3 is the third air flow pressure value, P2 is the second air flow pressure value, K is the pressure conversion rate between the air flows in the main pipeline and the auxiliary air holes, k is the attenuation coefficient of the air flow pressure affected by the distance, d is the air flow attenuation distance, v2 is the pressurization tail speed of the fast pressurization stage curve, and t is the pressurization time.

[0080] In some embodiments, the pressing and forming device further includes a vision sensor, and the vision sensor is used to identify whether the formed part enters the preset material receiving area during the output of the air flow from the auxiliary air holes.

[0081] In some embodiments, the material box blowing device further includes a material storage component, the material storage component is provided with a material storage tank, the material storage component is arranged below the main body of the material box blowing device, and the material storage tank is located below the discharge port of the feeding pipeline.

[0082] The above powder pressing and forming system for powder metallurgy can implement the powder pressing and forming method of the above method embodiment. The optional items in the above method embodiment are also applicable to this embodiment, which will not be elaborated here. The remaining content of the embodiment of the present application can refer to the content of the above method embodiment, and will not be repeated in this embodiment.

[0083] Figure 5 This is a schematic structural diagram of the pressing and forming device provided by an embodiment of the present application. As Figure 5 shown, the pressing and forming device 5 of this embodiment includes: at least one processor 50 ( Figure 5 only one is shown in the figure), a memory 51, and a pressing and forming device program 52 stored in the memory 51 and operable on the at least one processor 50. When the processor 50 executes the pressing and forming device program 52, the steps in any of the above method embodiments are implemented.

[0084] The pressing and forming device may include but is not limited to the processor 50 and the memory 51. Those skilled in the art can understand that Figure 5 this is only an example of the pressing and forming device 5, and does not constitute a limitation on the pressing and forming device 5. It may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, it may further include input and output devices, network access devices, etc.

[0085] The so-called processor 50 may be a Central Processing Unit (CPU), and the processor 50 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0086] In some embodiments, the memory 51 may be an internal storage unit of the compression molding device 5, such as the hard disk or memory of the compression molding device 5. In some other embodiments, the memory 51 may also be an external storage device of the compression molding device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a FlashCard, etc., equipped on the compression molding device 5. Further, the memory 51 may also include both the internal storage unit of the compression molding device 5 and the external storage device. The memory 51 is used to store an operating system, application programs, a BootLoader, data, and other programs, such as the program code of the compression molding device program. The memory 51 may also be used to temporarily store data that has been output or will be output.

[0087] In addition, an embodiment of the present application further provides a compression molding device-readable storage medium storing a compression molding device program, and when the compression molding device program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0088] An embodiment of the present application provides a compression molding device program product, and when the compression molding device program product runs on the compression molding device 5, the compression molding device 5 is caused to execute the steps in each of the above method embodiments when executed.

[0089] In several embodiments provided by the present application, it can be understood that each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, the program segment, or the part of code includes one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in an order different from that marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved.

[0090] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a storage medium readable by a compression molding device. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The software product of the compression molding device is stored in a storage medium and includes several instructions for causing a compression molding device to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs and other various media that can store program codes.

[0091] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present application. It should be understood that the above description is only for the specific embodiments of the present application and is not used to limit the protection scope of the present application. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A powder pressing method for powder metallurgy, characterized in that: Applied to a press forming device, the press forming device comprises an upper die, a lower die and a material box blowing device, the material box blowing device comprises a feed pipe and a blowing pipe, the blowing pipe comprises a main pipe and a plurality of secondary air channels, the method comprises: The material box blowing device is moved to the top of the lower mold of the mold, the powder is fed into the lower mold of the mold from the feeding pipe in proportion, the lower mold of the mold is vibrated to make the powder filled evenly, and then the material box blowing device is reset; Controlling the upper mold and the lower mold to close the mold, so as to compress the powder in the lower mold, and then driving the molded part to move upward through the bottom plate of the lower mold; The main pipeline is pressurized according to a preset pressure curve, so that airflow is output from the plurality of secondary air channels to blow the molded parts to a preset material receiving area.

2. The powder pressing method for powder metallurgy according to claim 1, characterized in that: The step of pressurizing the main pipeline according to a preset pressure curve includes: Determining a preset pressure curve corresponding to the powder type of the molded part, the preset pressure curve comprising a pre-pressing stage curve and a fast pressurizing stage curve; According to the pre-pressurization stage curve, pressurizing and blowing air into the main pipeline at a preset pressurization rate to a first air flow pressure value, so that the airflow output by the plurality of the secondary air channels blows the molded part to start moving; According to the fast pressurization stage curve, the main pipeline blowing pressure is quickly increased to a second airflow pressure value at a first pressurization acceleration, and the main pipeline blowing pressure is maintained at the second airflow pressure value for a preset pressurization time, so that the airflow output by the multiple secondary air channels increases the movement rate of the molded part.

3. The powder pressing method for powder metallurgy according to claim 2, characterized in that: The first air flow pressure value is: Among them, P1 is the first airflow pressure value of the main pipeline, K is the pressure conversion rate between the airflow of the main pipeline and the auxiliary air channel, μ is the static friction coefficient between the molded part and the bottom plate of the lower mold of the mold, m is the mass of the molded part, g is the gravitational acceleration, S is the force area of ​​the molded part affected by the airflow, and P′ is a preset constant.

4. The powder pressing method for powder metallurgy according to claim 2, characterized in that: The preset pressure curve also includes a slow pressurization stage curve, and pressurizing the main pipeline according to the preset pressure curve also includes: According to the slow pressurization stage curve, the main pipeline blowing pressure is slowly increased to a third air flow pressure value at a second pressurization acceleration so that the air flow output by the plurality of secondary air channels maintains the moving speed of the molded part, and the first pressurization acceleration is greater than the second pressurization acceleration.

5. The powder pressing method for powder metallurgy according to claim 4, characterized in that: The second pressurization acceleration is: Wherein, a2 is the second pressurization acceleration, P3 is the third airflow pressure value, P2 is the second airflow pressure value, K is the pressure conversion rate between the airflow in the main duct and the auxiliary air duct, k is the attenuation coefficient of the airflow pressure affected by the distance, d is the airflow attenuation distance, v2 is the pressurization tail speed of the fast pressurization stage curve, and t is the pressurization time.

6. The powder pressing method for powder metallurgy according to claim 1, characterized in that: The press-forming equipment further comprises a visual sensor, which is used to identify whether the molded part enters the preset material receiving area during the period when the secondary air channel outputs air flow.

7. The powder pressing method for powder metallurgy according to claim 1, characterized in that: The material box blowing device also includes a material storage component, which is provided with a material storage trough. The material storage component is arranged below the main body of the material box blowing device, and the material storage trough is located below the discharge port of the feed pipe.

8. A powder pressing system for powder metallurgy, characterized in that: Applied to a press forming device, the press forming device comprises an upper die, a lower die and a material box blowing device, the material box blowing device comprises a feed pipe and a blowing pipe, the blowing pipe comprises a main pipe and a plurality of secondary air channels, the system comprises: A feeding control module is used to move the material box blowing device to the top of the mold lower die, feed the powder from the feeding pipe into the mold lower die in proportion, vibrate the mold lower die to fill the powder evenly, and then reset the material box blowing device; A pressing control module, used for controlling the upper mold and the lower mold to close the mold, so as to press and mold the powder in the lower mold, and then drive the molded part to move upward through the bottom plate of the lower mold; The material discharging control module is used to pressurize the main pipeline according to a preset pressure curve, so as to output airflow from the plurality of secondary air channels to blow the molded parts to a preset material receiving area.

9. A compression molding device, characterized in that: It comprises a processor and a memory, wherein the memory is used to store a computer program, and when the computer program is executed by the processor, the powder pressing molding method for powder metallurgy according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: It stores a computer program, and when the computer program is executed by a processor, the powder pressing molding method for powder metallurgy as claimed in any one of claims 1 to 7 is implemented.

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