High-cleanliness rubber discharging and annealing dual-purpose heat treatment furnace
By setting up an isolation layer on the inner side of the refractory insulation layer of the heat treatment furnace, oil and gas are blocked from entering, the problems of oil and gas condensation and secondary overflow are solved, and the cleanliness of the furnace and the heat treatment quality of metal materials are improved.
Patent Information
- Application Number
- CN202411765580.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-03-04
AI Technical Summary
In heat treatment furnaces that have both glue removal and annealing functions, oil and gas easily diffuse into the refractory insulation layer, resulting in condensation and secondary overflow, affecting the cleanliness of the furnace and the heat treatment quality of metal materials.
The isolation layer is arranged on the inner side of the refractory insulation layer, including a middle-layer structure and an inner layer structure. The middle-layer structure covers the inner surface of the refractory insulation layer. The inner layer structure is rigid and connected to the furnace shell through an anchor to prevent oil and gas from entering the refractory insulation layer.
It effectively prevents oil and gas from entering the refractory insulation layer, avoids condensation and secondary overflow of oil and gas, ensures the cleanliness of the furnace during the annealing process, and improves the heat treatment quality of metal materials.
Smart Images
Figure CN119553041A_ABST
Abstract
Description
Technical Field
[0001] The invention mainly relates to the technical field of metal heat treatment, and in particular to a high-cleanliness dual-purpose heat treatment furnace for debinding and annealing. Background Art
[0002] Debinding and annealing are two important process steps in metal heat treatment. Debinding refers to the process of removing the oil and gas generated by evaporation in metal materials by the flow of gas (such as air) under high temperature environment; annealing refers to the high-temperature sintering of metal materials in a protective atmosphere (such as argon environment). At present, the debinding and annealing of metal materials are handled by two different equipments, that is, the metal materials are first debinded in one set of equipment, and then transferred to another equipment for annealing. This method of using different equipment for debinding and annealing has obvious defects. For example, between the two processes of debinding and annealing, the metal materials must first be cooled, and then the cooled metal materials must be transported out of the heat treatment furnace for debinding and loaded into the heat treatment furnace for annealing to heat up and sinter again. The transfer steps between the heat treatment furnaces are cumbersome, which not only affects the production efficiency, but also increases the energy consumption in the process of cooling and heating.
[0003] In order to omit the transfer step between heat treatment furnaces, the applicant has developed a heat treatment furnace with both debinding and annealing functions, that is, the metal material is successively debinded and annealed in the heat treatment furnace, thereby eliminating the need for transfer.
[0004] In order to reduce heat energy loss and avoid overheating damage to the furnace shell, this heat treatment furnace with both debinding and annealing functions needs to be equipped with a refractory insulation layer in the furnace body. During the debinding process, oil and gas easily diffuse into the refractory insulation layer. After the temperature drops, they will condense and tightly combine with the refractory insulation layer. When the temperature in the furnace rises again, the oil and gas will evaporate again and overflow for the second time. This residual oil and gas has little effect on the heat treatment furnace used only for debinding in the prior art, because when the furnace temperature rises again and the oil and gas overflow for the second time, the oil and gas in the metal material are also in a gaseous state. Therefore, the oil and gas overflowing for the second time can be mixed with the oil and gas in the metal material and discharged together, so as not to seriously affect the cleanliness of the furnace. However, in the heat treatment furnace developed by the applicant that has both debinding and annealing functions, this secondary overflow of oil and gas is difficult to meet the process requirements. This is because when entering the annealing process, the gas in the furnace no longer flows outward in large quantities and continuously, so the oil and gas cannot be discharged in time through the flow of gas. When the temperature rises again, the oil and gas remaining in the refractory insulation layer enters the furnace in a gaseous state and pollutes the metal material, thereby seriously affecting the quality of the heat treatment and may even cause the metal material to be scrapped. Summary of the invention
[0005] The technical problem to be solved by the present invention is how to avoid or reduce the residue of oil and gas in the refractory insulation layer in a heat treatment furnace with both debinding and annealing functions, thereby avoiding or reducing the secondary overflow of oil and gas in a high temperature environment, thereby improving the cleanliness of the furnace and ensuring the heat treatment quality of metal materials.
[0006] In order to solve the above technical problems, the present invention provides a high-cleanliness dual-purpose heat treatment furnace for debinding and annealing, which adopts the following technical solutions: A high-cleanliness dual-purpose heat treatment furnace for binder removal and annealing comprises a furnace shell, a refractory insulation layer is arranged inside the furnace shell, and an isolation layer is arranged inside the refractory insulation layer for preventing oil and gas from entering the refractory insulation layer from the furnace chamber.
[0007] Providing a refractory insulation layer in the furnace body can reduce heat energy loss and avoid overheating damage to the furnace shell, thereby extending the service life of the furnace shell. However, since the insulation layer is often made of porous materials, during the debinding process, oil and gas can easily diffuse into the refractory insulation layer. After the temperature is reduced, it will condense and tightly combine with the refractory insulation layer. When entering the annealing process, as the temperature in the furnace rises again, the oil and gas will evaporate again and overflow for a second time. The oil and gas enter the furnace in a gaseous state and pollute the metal material, thereby seriously affecting the quality of heat treatment and even causing the metal material to be scrapped. The present invention can effectively block oil and gas from entering the refractory insulation layer from the furnace by providing an isolation layer on the inner side of the refractory insulation layer, thereby avoiding condensation and secondary overflow of oil and gas in the refractory insulation layer, ensuring the cleanliness of the furnace during the annealing process, and improving the heat treatment quality of the metal material. Therefore, the heat treatment furnace disclosed in the present invention can be used for debinding and annealing at the same time, eliminating the transfer step between the two processes, which can not only improve production efficiency, but also reduce energy consumption.
[0008] In the above-mentioned dual-purpose heat treatment furnace for binder removal and annealing, preferably, the isolation layer comprises a middle layer structure which completely covers the inner surface of the refractory insulation layer, and the edge of the middle layer is sealed and connected to the furnace shell.
[0009] The middle layer structure of the isolation layer completely covers the inner surface of the refractory insulation layer and is sealed with the furnace shell, thereby enhancing the isolation effect and ensuring that no oil and gas can enter the refractory insulation layer from the furnace, thereby effectively preventing condensation and secondary overflow of oil and gas in the refractory insulation layer.
[0010] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the thickness of the middle layer structure is 0.01 mm-0.6 mm, and it can bend into a wavy shape when heated and stretch into a flat shape when cooled.
[0011] When heat treating metal materials, the temperature in the furnace chamber rises sharply, and the middle layer structure will expand due to thermal expansion and contraction. If the selected material has a large rigidity, the force generated by the expansion will be transmitted to the furnace shell along the edge of the middle layer structure, thereby generating a large thrust on the furnace shell, which may cause damage to the equipment. In order to reduce the thrust during thermal expansion and contraction, the present invention uses a thin-walled material with a thickness of 0.01mm-0.6mm, which can adapt to the changes in the temperature in the furnace chamber and deform and bend adaptively when thermal expansion and contraction occur, thereby reducing the pushing on the furnace shell caused by deformation, maintaining the integrity of the isolation layer, ensuring its isolation function, and avoiding structural damage caused by temperature changes.
[0012] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the melting point of the middle layer structure is not less than 600°C.
[0013] The middle layer structure adopts a high melting point design to ensure the structural stability of the middle layer structure at high temperatures, prevent structural damage caused by high temperatures, and ensure its long-term isolation effect.
[0014] Specifically, the middle structure can be made of high temperature resistant materials such as aluminum foil, copper foil or non-metallic film (such as glass fiber cloth), which are generally laid in one layer. The middle structure is usually formed by splicing multiple pieces of foil / film to form a whole. The joints can be welded (rolled), and the gaps between the welds can be filled with high-temperature inorganic glue, so that the middle structure forms a closed whole, which can effectively prevent oil and gas from entering the fire-resistant insulation layer. More specifically, at the splicing of the foil / film, multiple rolls are welded and multiple inorganic glue colloids are arranged to connect, that is, a continuous inorganic glue is applied next to each roll weld, and the gaps formed on the roll weld are filled with inorganic glue, so that the sealing performance can be effectively improved.
[0015] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the isolation layer also includes an inner layer structure that completely covers the inner surface of the middle layer structure; the inner layer structure is rigid and connected to the furnace shell via anchors.
[0016] By setting up an inner layer structure that completely covers the inner surface of the middle layer structure, the inner layer structure cooperates with the middle layer structure to further improve the isolation effect. At the same time, since there is no firm connection between the refractory insulation layer and the furnace shell, and between the middle layer structure and the refractory insulation layer, and the thickness of the middle layer structure is relatively thin, it is difficult to provide sufficient support for the refractory insulation layer. Therefore, by setting up a rigid inner layer structure, and connecting the inner layer structure to the furnace shell via anchors, the inner layer structure can be used to press and fix the middle layer structure and the refractory insulation layer to the inner side of the furnace shell to avoid loosening, thereby improving the structural stability of the entire isolation layer.
[0017] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the inner layer structure comprises a plurality of inner layer plates, and adjacent inner layer plates are overlapped.
[0018] When the metal material is heat treated, the temperature in the furnace rises sharply, and the inner structure will expand due to thermal expansion and contraction. Since the inner structure is rigid, if it is set as an integral structure, the force generated by the expansion will be transmitted to the furnace shell along the edge of the inner structure, thereby generating a large thrust on the furnace shell, which may cause damage to the equipment. In order to reduce the thrust during thermal expansion and contraction, the present invention designs the inner structure into a structure in which several inner plates are overlapped but not connected as a whole. When the inner plates expand due to heat, each inner plate expands separately, and the stress is released at the overlap without accumulating and transmitting to the edge of the inner structure. Therefore, it can effectively reduce the pushing of the inner structure on the furnace shell caused by deformation, maintain the integrity of the isolation layer, ensure its isolation function, and avoid structural damage caused by temperature changes.
[0019] In the above-mentioned dual-purpose heat treatment furnace for binder removal and annealing, preferably, at 600° C., the pressure that the inner layer structure surrounded by four adjacent anchors can withstand is not less than 5000 Pa.
[0020] In a high temperature environment of 600°C, the inner layer structure can withstand a pressure of no less than 5000Pa, indicating that the inner layer structure has high structural strength and stability, can adapt to the high temperature environment in the furnace, and ensure its isolation effect. Accordingly, the inner layer structure can be made of materials such as metal foil or non-metallic film that can withstand a temperature of no less than 600°.
[0021] In the above-mentioned dual-purpose heat treatment furnace for binder removal and annealing, preferably, the isolation layer also includes an outer layer structure that completely covers the outer surface of the middle layer structure, and its thickness is 0.1mm-0.6mm, and the outer layer structure can bend into a wavy shape when heated and stretch into a flat shape when cooled.
[0022] By providing an outer layer structure that completely covers the outer surface of the middle layer structure, the outer layer structure cooperates with the middle layer structure to further improve the isolation effect. When the metal material is heat treated, the temperature in the furnace rises sharply, and the outer layer structure will expand due to thermal expansion and contraction. If the selected material has a large rigidity, the force generated by the expansion will be transmitted to the furnace shell along the edge of the outer layer structure, thereby generating a large thrust on the furnace shell, which may cause damage to the equipment. In order to reduce the thrust during thermal expansion and contraction, the present invention adopts a thin-walled material with a thickness of 0.01mm-0.6mm, which can adapt to the changes in the temperature in the furnace and deform and bend adaptively when thermal expansion and contraction occur, thereby reducing the pushing on the furnace shell caused by deformation, maintaining the integrity of the isolation layer, ensuring its isolation function, and avoiding structural damage caused by temperature changes.
[0023] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the melting point of the outer layer structure is not less than 600°C.
[0024] The high melting point design of the outer structure also ensures the structural stability of the outer structure at high temperatures, prevents structural damage caused by high temperatures, and ensures its long-term isolation effect.
[0025] In the above dual-purpose heat treatment furnace for binder removal and annealing, preferably, the outer layer structure comprises a plurality of outer layer plates, and adjacent outer layer plates are overlapped.
[0026] When the metal material is heat treated, the temperature in the furnace rises sharply. At this time, the outer structure will expand due to thermal expansion and contraction. The force generated by the expansion will be transmitted to the furnace shell along the edge of the inner structure, thereby generating a large thrust on the furnace shell, which may cause damage to the equipment. In order to reduce the thrust during thermal expansion and contraction, the present invention designs the outer structure into a structure in which several outer plates are overlapped but not connected as a whole. When the inner plates expand due to heat, each expands and the stress is released at the overlap without accumulating and transmitting to the edge of the outer structure. Therefore, the outer structure can effectively reduce the pushing of the furnace shell caused by deformation, maintain the integrity of the isolation layer, ensure its isolation function, and avoid structural damage caused by temperature changes. Specifically, the outer structure can be made of high temperature resistant materials such as aluminum foil, copper foil, and non-metallic film (such as glass fiber cloth). It can be overlapped in one or more layers, but the number of overlapped layers generally does not exceed three layers.
[0027] Compared with the prior art, the advantages of the present invention are: The high-cleanliness dual-purpose heat treatment furnace for binder removal and annealing of the present invention can reduce heat energy loss and avoid overheating damage to the furnace shell by arranging a refractory insulation layer in the furnace body, thereby extending the service life of the furnace shell. However, since the insulation layer is often made of porous materials, during the binder removal process, oil and gas can easily diffuse into the refractory insulation layer. After the temperature is reduced, it will condense and tightly combine with the refractory insulation layer. When entering the annealing process, as the temperature in the furnace rises again, the oil and gas will evaporate again and overflow for a second time. The oil and gas enter the furnace in a gaseous state and pollute the metal material, thereby seriously affecting the quality of the heat treatment and may even cause the metal material to be scrapped. The present invention can effectively block the oil and gas from entering the refractory insulation layer from the furnace by arranging an isolation layer on the inner side of the refractory insulation layer, thereby avoiding the condensation and secondary overflow of the oil and gas in the refractory insulation layer, ensuring the cleanliness of the furnace during the annealing process, and improving the heat treatment quality of the metal material. Therefore, the heat treatment furnace disclosed in the present invention can be used for debinding and annealing at the same time, eliminating the transfer step between the two processes, which can not only improve production efficiency but also reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a structural schematic diagram of a dual-purpose heat treatment furnace for debinding and annealing.
[0029] Figure 2 It is a partial schematic diagram of a dual-purpose heat treatment furnace for debinding and annealing.
[0030] The reference numerals in the figure represent: 1. furnace shell; 2. refractory insulation layer; 3. furnace; 4. isolation layer; 41. middle layer structure; 42. inner layer structure; 43. outer layer structure; 5. anchoring piece; 51. pressure plate. DETAILED DESCRIPTION
[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0032] Example like Figure 1 and Figure 2 As shown, the high-cleanliness dual-purpose heat treatment furnace for binder removal and annealing of this embodiment includes a furnace shell 1, a refractory insulation layer 2 is provided on the inner side of the furnace shell 1, and an isolation layer 4 is provided on the inner side of the refractory insulation layer 2 for blocking oil and gas from entering the refractory insulation layer 2 from the furnace chamber 3.
[0033] In this embodiment, the isolation layer 4 includes a middle layer structure 41 that completely covers the inner surface of the refractory insulation layer 2, and its edge is sealed and connected to the furnace shell 1. In this embodiment, only one layer of the middle layer structure 41 is provided, and adjacent middle layer structures 41 are connected by roll welding and filled with high-temperature inorganic glue to ensure that the inner layer structure 42 can be connected to form a closed whole, ensuring that it has a good isolation effect.
[0034] In this embodiment, the thickness of the middle layer structure 41 is 0.01 mm-0.6 mm, and it can bend into a wave shape when heated and stretch into a flat shape when cooled.
[0035] In this embodiment, the melting point of the middle layer structure 41 is not less than 600° C. In this embodiment, the middle layer structure 41 is made of a metal foil with a thickness of 0.2 mm. In other embodiments, the middle layer structure 41 may also be made of materials with other thicknesses, but its thickness should be between 0.01 mm and 0.6 mm to better adapt to the temperature change in the furnace 3, and the melting point of its material should not be less than 600° C. to better adapt to the high temperature environment in the furnace 3.
[0036] In this embodiment, the isolation layer 4 further includes an inner layer structure 42 which completely covers the inner surface of the middle layer structure 41 ; the inner layer structure 42 is rigid and connected to the furnace shell 1 via the anchor 5 .
[0037] Specifically, the middle structure 41 can be made of high temperature resistant materials such as aluminum foil, copper foil or non-metallic film (such as glass fiber cloth), which is generally laid in one layer. The middle structure 41 is usually formed by splicing multiple pieces of foil / film to form a whole. The joints can be welded (rolled), and the welds 6 can be filled with high-temperature inorganic glue 7, so that the middle structure 41 forms a closed whole, which can effectively prevent oil and gas from entering the fire-resistant insulation layer. More specifically, at the splicing of the foil / film, multiple roll welding seams 6 and multiple inorganic glues 7 are arranged to connect, that is, a continuous inorganic glue 7 is applied next to each roll welding seam 6, and the inorganic glue 7 is used to fill the gap formed on the roll welding seam 6, thereby effectively improving the sealing performance.
[0038] In this embodiment, the inner layer structure 42 includes a plurality of inner layer plates, and adjacent inner layer plates are overlapped. The overlap length between adjacent inner layer plates should be able to adapt to the temperature change in the furnace 3, ensuring that the inner layer structure 42 can be connected to form a closed whole when it is cold and stretched, ensuring that it has a good isolation effect.
[0039] In this embodiment, at 600°C, the pressure that the inner layer structure 42 surrounded by four adjacent anchors 5 can withstand is not less than 5000Pa. Specifically, a pressure plate 51 is provided on the anchor 5, and the pressure plate 51 is connected to the middle layer structure 41 by welding and bonding. Specifically, the pressure plate 51 and the middle layer structure 41 are connected in the form of multiple roll welding seams 6 and multiple inorganic adhesives 7, that is, a continuous inorganic adhesive 7 is applied next to each roll welding seam 6, and the inorganic adhesive 7 is used to fill the gap formed on the roll welding seam 6, thereby effectively improving the sealing performance.
[0040] In this embodiment, the isolation layer 4 also includes an outer layer structure 43 that completely covers the outer surface of the middle layer structure 41, and has a thickness of 0.1 mm-0.6 mm. The outer layer structure 43 can bend into a wave shape when heated and stretch into a flat shape when cooled.
[0041] In this embodiment, the melting point of the outer layer structure 43 is not less than 600° C. The outer layer structure 43 is made of a metal foil with a thickness of 0.2 mm. In other embodiments, the outer layer structure 43 may also be made of materials with other thicknesses, but its thickness should be between 0.01 mm and 0.6 mm to better adapt to the temperature changes in the furnace 3, and the melting point of its material should not be less than 600° C. to better adapt to the high temperature environment in the furnace 3.
[0042] In this embodiment, the outer layer structure 43 includes a plurality of outer layer plates, and adjacent outer layer plates are overlapped. The overlap length between adjacent outer layer plates should be able to adapt to the temperature change in the furnace 3, ensuring that the outer layer structure 43 can be connected to form a closed whole when it is stretched in cold weather, ensuring that it has a good isolation effect. In this embodiment, the outer layer structure 43 is provided with only one layer, that is, a plurality of outer layer plates are overlapped to form one layer of the outer layer structure 43. In other embodiments, the number of the outer layer structure 43 can also be provided with one or three layers according to the needs.
[0043] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.
Claims
1. A high-cleanliness dual-purpose heat treatment furnace for binder removal and annealing, comprising a furnace shell (1), wherein a refractory insulation layer (2) is provided on the inner side of the furnace shell (1), characterized in that: An isolation layer (4) is provided on the inner side of the refractory heat-insulating layer (2) for preventing oil and gas from entering the refractory heat-insulating layer (2) from the furnace (3).
2. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 1 is characterized in that: The isolation layer (4) comprises a middle layer structure (41) which completely covers the inner surface of the refractory insulation layer (2), and the edge of the middle layer structure (41) is sealed and connected to the furnace shell (1).
3. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 2 is characterized in that: The thickness of the middle layer structure (41) is 0.01 mm to 0.6 mm, and it can bend into a wave shape when heated, and stretch into a flat shape when cooled.
4. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 2 is characterized in that: The melting point of the middle layer structure (41) is not less than 600°C.
5. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to any one of claims 1 to 4, characterized in that: The isolation layer (4) further comprises an inner layer structure (42) which completely covers the inner surface of the middle layer structure (41); the inner layer structure (42) is rigid and connected to the furnace shell (1) via an anchor (5).
6. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 5, characterized in that: The inner layer structure (42) comprises a plurality of inner layer panels, and adjacent inner layer panels are overlapped.
7. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 5, characterized in that: At 600° C., the inner layer structure (42) enclosed by four adjacent anchoring pieces (5) can withstand a pressure of not less than 5000 Pa.
8. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to any one of claims 1 to 4, characterized in that: The isolation layer (4) further comprises an outer layer structure (43) which completely covers the outer surface of the middle layer structure (41), and has a thickness of 0.1 mm to 0.6 mm. The outer layer structure (43) is capable of bending into a wave shape when heated and stretching into a plane shape when cooled.
9. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 8, characterized in that: The melting point of the outer layer structure (43) is not less than 600°C.
10. The high cleanliness debinding and annealing dual-purpose heat treatment furnace according to claim 8, characterized in that: The outer layer structure (43) comprises a plurality of outer layer plates, and adjacent outer layer plates are overlapped.