Full-automatic sintering press and control method
The fully automatic sintering press features a zoned sealing design, enabling independent control of each process stage. This solves the problem of mutual interference between temperature, pressure, and atmosphere in existing equipment, improves the flatness and dimensional stability of the products, and increases the yield rate.
Patent Information
- Application Number
- CN202511280301.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-12-05
AI Technical Summary
The preheating, pressurization and cooling areas of existing sintering and pressing equipment are integrated into one, which makes it impossible to independently and accurately control the temperature, pressure and cavity atmosphere. As a result, the product deforms during pressurized sintering and is difficult to recover, affecting flatness and dimensional stability, resulting in a low yield.
Design a fully automatic sintering press with partitioned sealed preheating, pressurizing and cooling mechanisms to achieve independent control and sealed isolation of each process stage. Deformation is limited by preheating and pressurizing during mold closing, and deformation is constrained or restored during the cooling stage.
It significantly improves the flatness and dimensional stability of products, increases yield, and reduces process interference by independently controlling the temperature and pressure at each stage, ensuring the recovery or constraint of product deformation during cooling.
Smart Images
Figure CN121067604A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of silicon carbide hot pressing sintering technology, specifically to a fully automatic sintering press and its control method. Background Technology
[0002] The preheating, pressurization (sintering) and cooling areas of existing sintering and pressing equipment are all integrated, which makes it impossible to independently and accurately control the temperature, pressure and cavity atmosphere at each stage, causing mutual interference. At the same time, the product deforms during pressurization and sintering, and the deformation is difficult to recover or restrain during the cooling process, resulting in poor flatness and dimensional stability and low yield. Summary of the Invention
[0003] The purpose of this invention is to provide a fully automatic sintering press and control method, which can achieve independent control and sealed isolation of temperature and pressure at each process stage, thereby effectively suppressing the deformation caused by pressure sintering and promoting or constraining the deformation recovery during the cooling stage, significantly improving the flatness and dimensional stability of the product and increasing the yield.
[0004] To achieve the above objectives, according to a first aspect of the present invention, a fully automatic sintering press is provided, comprising a preheating mechanism, a pressurizing mechanism, and a cooling mechanism arranged in a partitioned and sealed manner; The preheating mechanism includes a preheating platform and a first cylinder disposed above the preheating platform. A heating tube is disposed inside the preheating platform, and a first upper cover is disposed on the movable end of the first cylinder. The first upper cover cooperates with the preheating platform to preheat the product. The pressurizing mechanism includes a frame, an upper mold fixed on the frame, and a lower mold that can be controlled to move along the vertical direction of the frame. The lower mold cooperates with the upper mold to pressurize and sinter the product. The cooling mechanism includes a cooling platform and a second pressurizing cylinder disposed above the cooling platform. The cooling platform has a cooling chamber, and the movable end of the second pressurizing cylinder is provided with a second pressurizing cover. The second pressurizing cover cooperates with the cooling platform to pressurize and cool the product.
[0005] Optionally, the preheating platform, the lower mold, and the cooling platform are all provided with a vacuum interface and a nitrogen filling interface, and the lower mold and the cooling platform are all provided with a formic acid filling interface.
[0006] Optionally, the fully automatic sintering press further includes a film winding mechanism mounted on the frame for winding film between the upper mold and the lower mold.
[0007] Optionally, the preheating mechanism is provided with a feeding mechanism, and the cooling mechanism is provided with a discharging mechanism.
[0008] Optionally, a pressure regulating valve is provided at both the first cylinder and the second pressurizing cylinder.
[0009] According to a second aspect of the present invention, a control method for a fully automatic sintering press is provided, comprising the following steps: After the product is loaded onto the preheating platform, the preheating mechanism is controlled to preheat the product. After the preheated product is transferred to the lower mold, the pressurizing mechanism is controlled to close the mold and pressurize and sinter the product. After the product is transferred to the cooling platform after pressure sintering, the cooling mechanism is controlled to pressurize and cool the product.
[0010] Optionally, after the product is fed onto the preheating platform, controlling the preheating mechanism to preheat the product includes the following steps: The feeding mechanism is controlled to feed the product onto the preheating platform; Control the first cylinder to press the first upper cover down to the preheating platform to close and seal the cover, and then perform vacuuming and nitrogen filling; Control the heating element to preheat the product for 5-10 minutes.
[0011] Optionally, after the preheated product is transferred to the lower mold, controlling the pressurizing mechanism to close the mold and pressurize and sinter the product includes the following steps: The feeding mechanism is controlled to transfer the preheated product to the lower mold; The pressurizing mechanism is controlled to move the lower mold upward to close and seal the upper mold under pressure, and to perform vacuuming, nitrogen filling, and formic acid filling; The pressurizing mechanism is controlled to pressurize and sinter the product for 5-10 minutes.
[0012] Optionally, after the product is transferred to the cooling platform following pressure sintering, controlling the cooling mechanism to pressurize and cool the product includes the following steps: The feeding mechanism is controlled to transfer the pressurized sintered product to the cooling platform; Control the second pressurizing cylinder to press the second pressurizing cover down to the cooling platform to close the cover, seal and pressurize, and perform vacuuming, nitrogen filling, and formic acid filling; The cooling chamber is controlled to cool the product; The deformation of the product is manually inspected, and the subsequent pressurization parameters of the cooling mechanism are adjusted according to the inspection results to ensure that the product deformation meets the standard.
[0013] The beneficial effects of this invention are as follows: By setting the preheating mechanism, pressurizing mechanism, and cooling mechanism as independent sealed cavities, and by setting a preheating platform, a first cylinder, a first upper cover, and a heating pipe in the preheating mechanism, and a cooling platform, a second pressurizing cylinder, a second pressurizing upper cover, and a cooling chamber in the cooling mechanism, independent control and sealed isolation of temperature and pressure at each process stage are achieved. On the one hand, the process interference between each stage is eliminated by the partitioned sealing, so that temperature and pressure parameters can be set and maintained stably in the three stages of preheating, pressurized sintering, and cooling. On the other hand, the preheating of the preheating mechanism and the mold closing and pressurizing of the pressurizing mechanism limit the instantaneous deformation at the high temperature stage, and the cooling mechanism cools under controlled pressure to constrain or promote the recovery of the deformation that has already occurred. Thus, the deformation of the product generated during pressurized sintering is specifically suppressed and recovered or constrained during the cooling process, which significantly improves flatness and dimensional stability and increases yield.
[0014] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0015] Figure 1 This is a schematic structural diagram of a fully automatic sintering press according to an embodiment of the present invention; Figure 2 This is a schematic flowchart illustrating a control method for a fully automatic sintering press according to an embodiment of the present invention; Figure 3 for Figure 2 A schematic flowchart of step S10; Figure 4 for Figure 2 A schematic flowchart of step S20; Figure 5 for Figure 2 A schematic flowchart of step S30; In the diagram: 1. Preheating mechanism; 11. Preheating platform; 12. First cylinder; 13. Heating tube; 14. First upper cover; 2. Pressurizing mechanism; 21. Frame; 22. Upper mold; 23. Lower mold; 3. Cooling mechanism; 31. Cooling platform; 32. Second pressurizing cylinder; 33. Cooling chamber; 34. Second pressurizing upper cover; 4. Film winding mechanism; 5. Feeding mechanism; 6. Unloading mechanism; 7. Pressure regulating valve. Detailed Implementation
[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0019] Please see Figure 1 A preferred embodiment of this application shows a fully automatic sintering press comprising a preheating mechanism 1, a pressurizing mechanism 2, and a cooling mechanism 3, all configured with partitioned sealing. The preheating mechanism 1 includes a preheating platform 11 and a first cylinder 12 disposed above the preheating platform 11. A heating tube 13 is disposed within the preheating platform 11. A first upper cover 14 is disposed at the movable end of the first cylinder 12, and the first upper cover 14 cooperates with the preheating platform 11 to preheat the product. The pressurizing mechanism 2 includes a frame 21, an upper mold 22 fixed to the frame 21, and a lower mold 23 controllably movable along the vertical direction of the frame 21. The lower mold 23 cooperates with the upper mold 22 to pressurize and sinter the product. The cooling mechanism 3 includes a cooling platform 31 and a second pressurizing cylinder 32 disposed above the cooling platform 31. A cooling chamber 33 is disposed within the cooling platform 31. A second pressurizing upper cover 34 is disposed at the movable end of the second pressurizing cylinder 32, and the second pressurizing upper cover 34 cooperates with the cooling platform 31 to pressurize and cool the product.
[0020] According to the embodiment of the present invention, by setting the preheating mechanism 1, the pressurizing mechanism 2, and the cooling mechanism 3 as independent cavities with partitioned sealing, and by setting the preheating mechanism 1 with a preheating platform 11, a first cylinder 12, a first upper cover 14, and a heating tube 13, and setting the cooling mechanism 3 with a cooling platform 31, a second pressurizing cylinder 32, a second pressurizing upper cover 34, and a cooling chamber 33, the temperature and pressure of each process stage can be independently controlled and sealed and isolated. On the one hand, the partitioned sealing eliminates process interference between stages, so that the temperature and pressure parameters can be set and maintained stably in the three stages of preheating, pressurized sintering, and cooling. On the other hand, the preheating of the preheating mechanism 1 and the mold closing and pressurizing of the pressurizing mechanism 2 limit the instantaneous deformation in the high-temperature stage, and the cooling mechanism 3 cools under controlled pressure to constrain or promote the recovery of the deformation that has occurred. Thus, the deformation of the product generated during pressurized sintering is specifically suppressed and recovered or constrained during the cooling process, which significantly improves the flatness and dimensional stability and increases the yield.
[0021] The following detailed description uses specific examples: The preheating platform 11, lower mold 23, and cooling platform 31 are all equipped with vacuum and nitrogen filling interfaces, while the lower mold 23 and cooling platform 31 are also equipped with formic acid filling interfaces. This configuration allows each zone cavity to be vacuumed, nitrogen-filled, or have reducing gases introduced for oxidation-reduction on an independent and controllable basis, thereby further enhancing the controllability of each stage and helping to reduce oxidation and improve the sintering chemical environment.
[0022] Please see Figure 1 The fully automatic sintering press also includes a film winding mechanism 4 mounted on the frame 21, used to wind the film between the upper mold 22 and the lower mold 23. A feeding mechanism 5 is located at the preheating mechanism 1, and a discharging mechanism 6 is located at the cooling mechanism 3. Pressure regulating valves 7 are installed at both the first cylinder 12 and the second pressurizing cylinder 32. The film serves as a physical isolation layer when in direct contact with the upper mold 22 and the lower mold 23, preventing the product from being contaminated by the mold or damaged due to direct contact during the mold closing and pressing process, thus protecting the product's surface and shape in conjunction with the pressurizing and mold closing process.
[0023] Please see Figure 2 This application also provides a control method for a fully automatic sintering press, comprising the following steps: Step S10: After the product is fed to the preheating platform 11, control the preheating mechanism 1 to preheat the product; Step S20: After the preheated product is transferred to the lower mold 23, the pressurizing mechanism 2 is controlled to close the mold and pressurize and sinter the product; Step S30: After the product is transferred to the cooling platform 31 after pressure sintering, the cooling mechanism 3 is controlled to pressurize and cool the product.
[0024] Please see Figure 3 Step S10 includes the following steps: Step S101: Control the feeding mechanism 5 to feed the product to the preheating platform 11; Step S102: Control the first cylinder 12 to press down the first upper cover 14 to the preheating platform 11 to close and seal the cover and perform vacuuming and nitrogen filling; Step S103: Control the heating element 13 to preheat the product for 5-10 minutes.
[0025] In step S103, the preheating temperature is 140℃-150℃.
[0026] Please see Figure 4 Step S20 includes the following steps: Step S201: Control the feeding mechanism 5 to transfer the preheated product to the lower mold 23; Step S202: Control the pressurizing mechanism 2 to move the lower mold 23 up and down to close and seal the upper mold 22 under pressure, and perform vacuuming, nitrogen filling, and formic acid filling; Step S203: Control the pressurizing mechanism 2 to pressurize and sinter the product for 5-10 minutes.
[0027] In step S203, the pressure for pressure sintering is 10-30 MPa. Before pressure sintering, it is also necessary to check whether the oxygen content in the mold meets the standard.
[0028] Please see Figure 5 Step S30 includes the following steps: Step S301: Control the feeding mechanism 6 to transfer the pressurized sintered product to the cooling platform 31; Step S302: Control the second pressurizing cylinder 32 to press down the second pressurizing cover 34 to the cooling platform 31 to close the cover, seal and pressurize, and perform vacuuming, nitrogen filling and formic acid filling; Step S303: Control the cooling chamber 33 to cool the product; Step S304: Manually inspect the product deformation amount, and adjust the subsequent pressurization parameters of the cooling mechanism 3 according to the inspection results to ensure that the product deformation amount meets the standard.
[0029] In step S303, the amount of formic acid used depends on the actual situation. In step S304, by manually detecting the product deformation and adjusting the pressure parameters for subsequent cooling and pressurization, it is easier for the product to reach the standard deformation amount.
[0030] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0031] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A fully automatic sintering press, characterized in that, It includes a preheating mechanism, a pressurizing mechanism, and a cooling mechanism for partitioned sealing; The preheating mechanism includes a preheating platform and a first cylinder disposed above the preheating platform. A heating tube is disposed inside the preheating platform, and a first upper cover is disposed on the movable end of the first cylinder. The first upper cover cooperates with the preheating platform to preheat the product. The pressurizing mechanism includes a frame, an upper mold fixed on the frame, and a lower mold that can be controlled to move along the vertical direction of the frame. The lower mold cooperates with the upper mold to pressurize and sinter the product. The cooling mechanism includes a cooling platform and a second pressurizing cylinder disposed above the cooling platform. The cooling platform has a cooling chamber, and the movable end of the second pressurizing cylinder is provided with a second pressurizing cover. The second pressurizing cover cooperates with the cooling platform to pressurize and cool the product.
2. The fully automatic sintering press according to claim 1, characterized in that, The preheating platform, the lower mold, and the cooling platform are all equipped with vacuum interfaces and nitrogen filling interfaces, and the lower mold and the cooling platform are all equipped with formic acid filling interfaces.
3. The fully automatic sintering press according to claim 1, characterized in that, It also includes a film winding mechanism mounted on the frame for winding film between the upper mold and the lower mold.
4. The fully automatic sintering press according to claim 1, characterized in that, The preheating mechanism is equipped with a feeding mechanism, and the cooling mechanism is equipped with a discharging mechanism.
5. The fully automatic sintering press according to claim 1, characterized in that, Both the first cylinder and the second pressurizing cylinder are equipped with pressure regulating valves.
6. A control method for a fully automatic sintering press as described in any one of claims 1 to 5, characterized in that, Includes the following steps: After the product is loaded onto the preheating platform, the preheating mechanism is controlled to preheat the product. After the preheated product is transferred to the lower mold, the pressurizing mechanism is controlled to close the mold and pressurize and sinter the product. After the product is transferred to the cooling platform after pressure sintering, the cooling mechanism is controlled to pressurize and cool the product.
7. The fully automatic sintering press according to claim 6, characterized in that, After the product is loaded onto the preheating platform, controlling the preheating mechanism to preheat the product includes the following steps: The feeding mechanism is controlled to feed the product onto the preheating platform; Control the first cylinder to press the first upper cover down to the preheating platform to close and seal the cover, and then perform vacuuming and nitrogen filling; Control the heating element to preheat the product for 5-10 minutes.
8. The fully automatic sintering press according to claim 6, characterized in that, After the preheated product is transferred to the lower mold, the pressurizing mechanism is controlled to close the mold and pressurize the product for sintering, which includes the following steps: The feeding mechanism is controlled to transfer the preheated product to the lower mold; The pressurizing mechanism is controlled to move the lower mold upward to close and seal the upper mold under pressure, and to perform vacuuming, nitrogen filling, and formic acid filling; The pressurizing mechanism is controlled to pressurize and sinter the product for 5-10 minutes.
9. The fully automatic sintering press according to claim 6, characterized in that, After the product is transferred to the cooling platform following pressure sintering, the cooling mechanism is controlled to pressurize and cool the product, including the following steps: The feeding mechanism is controlled to transfer the pressurized sintered product to the cooling platform; Control the second pressurizing cylinder to press the second pressurizing cover down to the cooling platform to close the cover, seal and pressurize, and perform vacuuming, nitrogen filling, and formic acid filling; The cooling chamber is controlled to cool the product; The deformation of the product is manually inspected, and the subsequent pressurization parameters of the cooling mechanism are adjusted according to the inspection results to ensure that the product deformation meets the standard.