Casting mold and method for tail shaft bracket for ship
By using a casting mold with foam model combined with a support structure in casting large cast steel parts, the problems of high cost and easy deformation of the wooden mold are solved, and a low-cost and efficient casting process is achieved, ensuring the accuracy and quality of the castings.
Patent Information
- Application Number
- CN202411727995.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-02-28
AI Technical Summary
In the prior art, wooden mold molding is used to cast large cast steel parts with high cost, long production time and susceptible to environmental factors, resulting in mold deformation and affecting the dimensional accuracy and shape of the casting.
A casting mold with a foam model combined with a support structure is provided with mechanical support through the support frame and the support rod to avoid the problem of the foam model being easily deformed. The combination of mud core and support rod is used to form a casting subsidy to prevent the shaft hole from sintering.
On the basis of maintaining the quality requirements of finished product accuracy, it reduces the cost and time of mold production, improves the dimensional accuracy and shape stability of castings, ensures the quality of finished product, and simplifies post-processing.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of casting, and in particular to a casting mold and a method for a tail shaft frame for a ship. Background Art
[0002] The tail shaft bracket is used for hull assembly and is located at the tail end of the hull bottom. One end is connected to the hull structure and the other end is connected to the propeller shaft. The tail shaft bracket supports and fixes the propeller shaft and allows the propeller shaft to rotate freely in the tail shaft bracket. It bears the torque and thrust transmitted by the propeller shaft and transmits it to the hull structure.
[0003] The tail shaft bracket is a key load-bearing product of the hull structure. It is required to have the same service life as the hull, strict internal quality requirements, and full-body ultrasonic flaw detection (I-level quality grade requirements). The product cannot have casting defects during welding and processing at the shipyard. The tail shaft bracket weighs 9000kg, with a maximum size of 3100*2000*950mm and a main wall thickness of 210-310mm. It is a large steel casting.
[0004] Usually, such large steel castings are made of wooden molds. Wooden molds can ensure the quality of molding before pouring during mass production. However, the cost of a single wooden mold is high and the production time is long, which affects production efficiency. After repeated use, the wooden mold is easily affected by environmental factors such as temperature and humidity, causing the mold to deform, affecting the dimensional accuracy and shape of the casting. The cost of replacing it is high, and if it is not replaced, it needs frequent repairs, which further increases the production cost. This is a major problem for the strict requirements of the ship's tail shaft bracket. Summary of the invention
[0005] The present invention aims to provide a casting mold for a tail shaft frame for a ship, which utilizes a foam model combined with a supporting structure to replace a wooden mold. On the basis of maintaining the quality requirements of the precision of the finished product, the structure is stable, the cost is low, and the replacement is easy. The quality of the finished product can be continuously and stably ensured, making it possible to use the foam model to cast large steel castings.
[0006] The basic scheme provided by the present invention is: a casting mold for a tail shaft frame for a ship, comprising a foam model, a support frame, a support rod and two mud cores;
[0007] The foam model has a tail shaft frame shape and a parting line along the irregular edge line of the tail shaft frame shape; the tail shaft frame shape of the foam model has a heat-generating and heat-insulating riser, the root of the heat-generating and heat-insulating riser has a rounded corner and the top has an exhaust channel;
[0008] The shape of the support frame is adapted to the shape of the foam model, providing a mechanical support point for the foam model;
[0009] The tail centers of the two mud cores are provided with holes adapted to the support rods. The support rods during casting and the two mud cores symmetrically assembled at both ends of the support rods form a whole structure adapted to the shaft hole of the tail shaft frame, and are used to form a casting subsidy;
[0010] The support rod is made of inner and outer double layers of different materials.
[0011] The present invention is based on a casting mold for a ship's tail shaft bracket and also provides a casting method for the ship's tail shaft bracket, the method comprising the following steps:
[0012] S100, casting preparation, placing the manufactured foam model on a support frame, the positions of the support beams are arranged and the intersections are located corresponding to the positions of the foam model with a high risk of deformation; preparing a sand box adapted to the foam model; the sand box includes a cover box and a bottom box, and the top of the cover box has an opening corresponding to the heating and insulation riser;
[0013] S200, molding and box closing, using foam models to mold in the cover box and the bottom box respectively, wherein a preset thickness of chromite sand is applied at the fillet of the root of the heat-generating and heat-insulating riser; after the molding in the cover box and the bottom box is completed, the foam models are taken out; the molding area and the mud core in the cover box and the bottom box are coated; the support rod is placed between the two mud cores, and the two mud cores and the support rod are placed at the position of the shaft hole of the tail shaft frame correspondingly; the cover box and the bottom box are closed up and down, and the cavity formed by the closing box is preheated;
[0014] S300, pouring and heat preservation, pouring into the cavity at a preset pouring temperature and pouring time, and after pouring is completed, pouring a preset number of times and heat preservation for a preset time;
[0015] S400, cooling and forming, after the cooling time is up, a casting is obtained, and the casting is taken out from the mold cavity; the support rods are crushed, the risers and the castings are gas cut, and post-processing is performed to obtain a finished product of a ship's tail shaft frame, wherein when the castings are gas cut, the shaft hole formed by the support rods during casting is used as a gas cutting molten steel outflow channel.
[0016] The working principle and advantages of the present invention are:
[0017] Compared with the prior art, this solution breaks through the conventional method of using wooden molds and metal molds to cast large steel castings, and proposes a casting method combining a foam model with a supporting structure, making it possible to use a foam model to cast large steel castings.
[0018] At present, the foam model for casting large steel castings has the disadvantage of easy deformation, which affects the quality and production efficiency of the castings. Therefore, there is a technical bias in using foam models to cast large steel castings. For enterprises with large production volumes, it is more conducive to production to directly use wooden molds and metal molds to cast large steel castings. However, for enterprises with small batch production, the cost pressure of wooden molds and metal molds is too great. Therefore, it is necessary to study the low-cost foam model casting of large steel castings.
[0019] In order to overcome the difficulty of casting large steel castings with foam models that are prone to deformation, this solution adopts a support frame that is compatible with the foam model, thereby avoiding the problem of easy deformation of the foam model. At the same time, it can support the sand box during the casting process, provide a targeted mechanical support point for the tail shaft frame modeling, and minimize the deformation risk of the entire casting process; a combination of mud core and support rod is adopted, and the support rod can not only provide support for the mud core to prevent the mud core from tilting and improve the modeling quality of the foam model, but also prevent the sintering of the shaft hole, and when the casting is formed, it can be processed by crushing, which has beneficial effects in avoiding deformation and sintering, as well as convenient processing; the support rod and two mud cores are cleverly used to form a casting subsidy, especially the shaft hole formed by the support rod, which can be used as the outflow channel of the molten steel for gas cutting during the gas cutting of the casting subsidy, thereby improving the safety of gas cutting.
[0020] The casting mold of this scheme greatly saves the mold making cost (the foam model costs 34,000 yuan, the wooden mold costs 148,000 yuan, and the foam model costs 23% of the wooden mold costs) and mold making time (the foam model cycle is 10 days, the wooden mold cycle is 25 days, and the foam model cycle is 40% of the wooden mold cost). It has considerable economic benefits, low replacement costs, and can continuously and stably guarantee the quality of finished products. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The structure of the finished tail shaft frame provided by the embodiment of the present invention is schematically shown. Figure 1 ;
[0022] Figure 2 The structure of the finished tail shaft frame provided by the embodiment of the present invention is schematically shown. Figure 2 ;
[0023] Figure 3 A schematic diagram of the structure of a foam model provided by an embodiment of the present invention;
[0024] Figure 4 A schematic diagram of the structure of a foam model and a support frame provided in an embodiment of the present invention;
[0025] Figure 5 A bottom view of a foam model and a support frame provided by an embodiment of the present invention;
[0026] Figure 6 A schematic diagram of the structure of a support frame provided by an embodiment of the present invention;
[0027] Figure 7 A schematic diagram of the structure of a cover box and a bottom box provided in an embodiment of the present invention;
[0028] Figure 8 Schematic diagram of the combined structure of the bottom box, mud core and support rod provided in the embodiment of the present invention Figure 1 ;
[0029] Fig. 9 Schematic diagram of the combined structure of the bottom box, mud core and support rod provided in the embodiment of the present invention Figure 2 ;
[0030] Fig.10 A schematic flow chart of a method for casting a tail shaft bracket for a ship provided by an embodiment of the present invention;
[0031] Fig.11 A partial schematic diagram of a pouring system provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0032] The following is a further detailed description through specific implementation methods:
[0033] The marks in the drawings of the specification include: tail shaft frame 1, shaft hole 11, foam model 2, tail shaft frame shape 21, edge line parting 22, heating and insulation riser 1 23, heating and insulation riser 2 24, fillet 25, exhaust channel 26, support frame 3, mud core 4, support rod 5, sand box 6, cover box 61, opening 611, bottom box 62, pouring system 7.
[0034] Embodiment 1
[0035] Basically as attached Figure 4 As shown: a casting mold for a tail shaft frame for a ship, in this embodiment, the tail shaft frame 1 is cast as shown in FIG. Figure 1 and Figure 2 As shown, it has the shaft hole 11 shown in the figure, with φ572mm shaft holes on both sides and a φ96*467mm shaft hole between the two φ572mm shaft holes. After pouring, the structural part at this shaft hole serves as a shrinkage compensation channel for the casting subsidy, and needs to be gas cut off after pouring.
[0036] The casting mold comprises a foam model 2 , a support frame 3 , a support rod 5 and two clay cores 4 .
[0037] like Figure 3As shown, the foam model 2 has a tail shaft frame 21 and a parting 22 along the irregular edge line of the tail shaft frame 21; the tail shaft frame 21 of the foam model 2 has a heat-generating and heat-insulating riser. In this embodiment, there are two risers, namely, heat-generating and heat-insulating riser 1 23 and heat-generating and heat-insulating riser 2 24. The root of the heat-generating and heat-insulating riser has a fillet 25, which is conducive to the gas and sand particles in the cavity floating to the riser during the pouring process, reducing the probability of defects in the casting body. In this embodiment, the fillet 25 is R70; the top of the riser has an exhaust channel 26, which is conducive to the discharge of gas in the cavity and the riser during the pouring process, reducing the probability of defects in the casting body. In this embodiment, the exhaust channel 26 is φ150. The riser of this scheme plays a shrinkage compensation role, and the shrinkage cavities and shrinkage porosity of the casting are distributed in the pouring system and the riser. No shrinkage cavities or shrinkage porosity areas are found in the casting body formed by this scheme.
[0038] like Figure 4 As shown, the shape of the support frame 3 is adapted to the shape of the foam model 2, providing a mechanical support point for the foam model 2 and stably supporting the foam model 2; Figure 5 and Figure 6 As shown, in this embodiment, the support frame 3 includes a support frame and a number of support beams welded in the support frame, and the position arrangement and intersection points of the several support beams correspond to the positions where the foam model 2 has a high risk of deformation, such as the middle of the tail shaft frame, the tail end thin sheet and the shaft hole cylinder. The support points and mechanical distribution of each position are very scientific. In this embodiment, the support frame 3 is formed by welding square steel, and the structure is stable.
[0039] like Figure 8 and Fig. 9 As shown, a hole for assembling with the support rod 5 is opened in the center of the tail of the two mud cores 4. The support rod 5 during casting and the two mud cores 4 symmetrically assembled at both ends of the support rod 5 form a whole with a structure that is adapted to the shaft hole 11 of the tail shaft frame 1, and is also used to form a casting subsidy; in this embodiment, a trapezoidal core head is provided at the tail of the mud core 4, and the two mud cores 4 form a φ572mm shaft hole structure on both sides of the tail shaft frame 1 in this embodiment; the mud core 4 is made of chromite sand (the refractoriness of chromite ore is about 200°C higher than that of silica sand), so as to prevent the φ572mm shaft hole from sintering and being unable to be machined (sintered sand is harder than the tool, and machining will cause tool wear).
[0040] The support rod 5 is used to support the two mud cores 4 to prevent the mud core 4 from tilting, effectively improve the stability of the foam mold modeling quality, improve the casting quality, and prevent the φ96*467mm axial hole from sintering and being unable to be cleaned; it is made of different materials for the inner and outer double layers, which is convenient for cleaning after casting. In this embodiment, the support rod 5 is a ceramic pouring pipe filled with graphite. If a ceramic pouring pipe is directly used, the hollow structure of the ceramic pouring pipe will be eroded and pressured by high-temperature molten steel. If there is no high-temperature resistant filling in the middle of the ceramic pouring pipe, it will break. The molten steel flows into the ceramic pouring pipe and cannot form a hole in the middle. Therefore, graphite is filled inside the ceramic pouring pipe. The refractoriness of graphite is very high and can generally withstand high temperatures of more than 3000°C. The ceramic pouring pipe is put on the outside. The high-temperature molten steel (1565°C) will not cause the sintering of φ96*467mm, nor will it contact with the graphite, and will not cause the problem of unqualified product C content, ensuring the casting quality. Specifically, the inner part is graphite of φ75*467mm, and the outer part is a ceramic pouring tube of φ80*467mm. The diameter of the support rod 5 is smaller than the diameter of the corresponding axial hole (φ96*467mm) at the position of the support rod 5 during pouring. Due to the high temperature thermal expansion effect during pouring, a gap space needs to be reserved. The length of the support rod 5 inserted into a single mud core 4 is 30-50mm, so that the support rod 5 can effectively support the two mud cores 4, and it is also convenient for handling after pouring.
[0041] The present embodiment provides a casting mold for a tail shaft frame 1 for a ship, which adopts a support frame adapted to the foam model, and can realize stable support for the foam model in the whole casting process, effectively avoiding the problem that the foam model is easy to deform. During the casting process, the support frame can also provide a stable support for the sand box, and provide a targeted mechanical support point for the tail shaft frame modeling, thereby minimizing the deformation risk caused by the foam model in the whole casting process. In addition, the mold adopts a combination of mud core and support rod, and the support rod can not only provide stable support for the mud core, prevent the mud core from tilting during the casting process, effectively improve the stability of the foam mold modeling quality, but also effectively prevent the sintering of the shaft hole. After the casting is formed, the support rod can be easily removed by crushing, avoiding the deformation and sintering problems that may be caused by the traditional method, while simplifying the processing process and improving production efficiency. In order to further improve the quality of the casting, the present embodiment also designs fillets and exhaust channels on the riser, which can effectively reduce the probability of defects in the casting body during the solidification process, ensure the integrity and surface quality of the internal structure of the casting, and perform coating treatment after molding to further improve the surface quality of the casting. Therefore, the casting mold of this scheme not only solves the common problems in the use of traditional foam models and mud cores through multi-faceted optimization design, but also significantly improves the molding quality and production efficiency of castings, and has important application value.
[0042] Embodiment 2
[0043] Based on the casting mold of the ship's tail shaft bracket described in the first embodiment, the present invention also provides a casting method of the ship's tail shaft bracket, such as Fig.10 As shown, the method includes:
[0044] S100, casting preparation, placing the prepared foam model 2 on the support frame 3 for standby use, the support frame 3 provides a mechanical support point for the foam model 2; preparing a sand box 6 that matches the shape of the foam model 2; Figure 7 As shown, the flask 6 includes a cover box 61 and a bottom box 62. The top of the cover box 61 has an opening 611 corresponding to the heating and heat-insulating riser. The height of the cover box 61 is greater than that of the bottom box 62, and is adapted to the tail shaft frame type 21 of this solution.
[0045] S200, molding and box closing, using the foam model 2 to mold in the cover box 61 and the bottom box 62 respectively, wherein a preset thickness of chromite sand is applied at the fillet 25 at the root of the heat-generating and heat-insulating riser; after the molding in the cover box and the bottom box is completed, the foam model is taken out; the molding area and the mud core in the cover box and the bottom box are coated; Figure 8 As shown, the support rod 5 is placed between the two mud cores 4, and the two mud cores 4 and the support rod 5 are placed at the positions of the shaft hole 11 of the tail shaft frame 1; the cover box 61 and the bottom box 62 are closed up and down, and the cavity formed by the closed box is preheated;
[0046] In this embodiment, because the mold required for the bottom box 62 is inside the support frame 3, and the mold required for the cover box 61 is above the support frame 3, and the support frame 3 is needed for the molding, the cover box 61 is molded first, and the bottom box 62 is molded after the cover box 61 is molded. First, the foam model 2 is stably placed on the support frame 3, and the cover box 61 is placed for molding. After the molding is completed, the cover box 61 and the foam model 2 are lifted up and turned over together, and the bottom box 62 is molded on the basis of the cover box. After the molding is completed, the foam model 2 is finally removed. The support frame 3 is used to provide mechanical support points throughout the molding process, which further reduces the deformation risk of the foam model 2 in casting large steel castings.
[0047] A preset thickness of chromite sand is applied at the fillet 25 at the root of the riser to prevent sintering at the root of the heat-insulating riser, which is difficult to clean. In this embodiment, the preset thickness is 150-200mm, and a steel ruler is used on site to ensure accurate laying thickness.
[0048] The molding area and the clay core in the cover box and the bottom box are treated with coating by brushing two coats of alcohol-based zircon powder coating on the molding area and the clay core in the cover box and the bottom box, and igniting the dried coating. The coating can form a protective layer to prevent direct contact between the molten metal and the sand mold, reduce defects such as sand sticking and pores, ensure that the surface of the casting is smooth and dense, so as to improve the surface quality of the casting and reduce defects.
[0049] The cavity formed by the combined box is preheated by using a hot air duct to pass hot air at 100-160°C into the cavity 4-6 hours before pouring, and the hot air duct is withdrawn before pouring to remove moisture from the surface of the cavity.
[0050] S300, pouring and heat preservation, pouring into the mold cavity at a preset pouring temperature and pouring time, and after pouring is completed, pouring a preset number of times and heat preservation for a preset time;
[0051] In this embodiment, in S300, the preset pouring temperature is 1565±5°C, the preset pouring time is 145-185s, the preset number of supplementary pouring is 4 times, and the preset insulation time is 168h. Through repeated tests, this data is reasonable and can obtain a high-quality tail shaft frame 1 weldment.
[0052] like Fig.11 As shown, in S300 , pouring into the mold cavity is completed by the pouring system 7 , and an opening 611 adapted to the pouring system 7 is reserved on the sand box 6 .
[0053] S400, cooling and forming, after the cooling time is up, a casting is obtained, the casting is taken out from the cavity, the support rod 5 is crushed, the riser is gas cut and post-processed, and the finished product of the ship tail shaft bracket 1 is obtained.
[0054] In this embodiment, after the product is cooled, the mud core is taken out and the graphite and ceramic pouring pipe can be broken by using an impact drill.
[0055] While gas cutting the riser, the casting subsidy at the axial hole is gas cut off. The channel formed by the corresponding axial hole (φ96*467mm) at the position of the support rod 5 is for the purpose of using an oxygen blowing tube to gas cut the casting subsidy. The molten steel in the gas cutting process can flow out of this axial hole and will not be blown back to the worker's face under the action of compressed air.
[0056] Post-processing includes cleaning and polishing, cleaning and polishing the product surface to reveal the metallic luster of the product; then heat treatment, shot blasting, rough machining, and ultrasonic flaw detection, and the above processes are all completed using existing technologies.
[0057] The present embodiment provides a method for casting a tail shaft frame for a ship. Based on a casting mold for a tail shaft frame for a ship in the present solution, the support frame and the support rod are efficiently used to avoid deformation of the foam model and the tail shaft frame shape during the entire casting process. On the basis of setting reasonable casting parameters, the shaft hole of the tail shaft frame is not sintered, the whole is bright, and it is easy to clean and post-process. A tail shaft frame casting with no shrinkage holes and shrinkage defects in the body and good quality can be obtained, and there will be no casting defects when it is transported to the shipyard for processing.
[0058] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. A casting mold for a tail shaft bracket for a ship, characterized in that: Includes foam model, support frame, support rods and two clay cores; The foam model has a tail shaft frame shape and a parting line along the irregular edge line of the tail shaft frame shape; the tail shaft frame shape of the foam model has a heat-generating and heat-insulating riser, the root of the heat-generating and heat-insulating riser has a rounded corner and the top has an exhaust channel; The shape of the support frame is adapted to the shape of the foam model, providing a mechanical support point for the foam model; The tail centers of the two mud cores are provided with holes adapted to the support rods. The support rods during casting and the two mud cores symmetrically assembled at both ends of the support rods form a whole structure adapted to the shaft hole of the tail shaft frame, and are used to form a casting subsidy; The support rod is made of inner and outer double layers of different materials.
2. A casting mold for a ship's tail shaft bracket according to claim 1, characterized in that: The support frame includes a support frame and a plurality of support beams welded in the support frame, and the positions of the plurality of support beams and their intersections correspond to positions where the foam model has a high risk of deformation.
3. The casting mold for a ship's tail shaft bracket according to claim 1, characterized in that: A trapezoidal core head is arranged at the tail of the mud core; and the mud core is made of chromite sand.
4. The casting mold for a ship's tail shaft bracket according to claim 1, characterized in that: The support rod is a ceramic pouring tube filled with graphite.
5. The casting mold for a ship's tail shaft bracket according to claim 1, characterized in that: The diameter of the support rod is smaller than the diameter of the corresponding axial hole at the position where the support rod is located during casting.
6. A method for casting a tail shaft bracket for a ship, characterized in that: Using the casting mold of a ship tail shaft bracket according to any one of claims 1 to 5, the method comprises: S100, casting preparation, placing the manufactured foam model on a support frame, the positions of the support beams are arranged and the intersections are located corresponding to the positions of the foam model with a high risk of deformation; preparing a sand box adapted to the foam model; the sand box includes a cover box and a bottom box, and the top of the cover box has an opening corresponding to the heating and insulation riser; S200, molding and box closing, using foam models to mold in the cover box and the bottom box respectively, wherein a preset thickness of chromite sand is applied at the fillet of the root of the heat-generating and heat-insulating riser; after the molding in the cover box and the bottom box is completed, the foam models are taken out; the molding area and the mud core in the cover box and the bottom box are coated; the support rod is placed between the two mud cores, and the two mud cores and the support rod are placed at the position of the shaft hole of the tail shaft frame correspondingly; the cover box and the bottom box are closed up and down, and the cavity formed by the closing box is preheated; S300, pouring and heat preservation, pouring into the cavity at a preset pouring temperature and pouring time, and after pouring is completed, pouring a preset number of times and heat preservation for a preset time; S400, cooling and forming, after the cooling time is up, a casting is obtained, and the casting is taken out from the mold cavity; the support rods are crushed, the risers and the castings are gas cut, and post-processing is performed to obtain a finished product of a ship's tail shaft frame, wherein when the castings are gas cut, the shaft hole formed by the support rods during casting is used as a gas cutting molten steel outflow channel.
7. A method for casting a tail shaft bracket for a ship according to claim 6, characterized in that: In S200, the foam model is used to shape the cover box and the bottom box respectively. The cover box is placed on the foam model located on the support frame to shape the cover box. After the cover box is shaped, the cover box and the foam model are turned over as a whole, and the bottom box is shaped on the cover box.
8. The method for casting a tail shaft bracket for a ship according to claim 6, characterized in that: In S200, the modeling area and the clay core in the cover box and the bottom box are subjected to coating treatment by brushing the modeling area and the clay core in the cover box and the bottom box with alcohol-based zircon powder coating twice, and igniting and burning the dried coating.
9. The method for casting a tail shaft bracket for a ship according to claim 6, characterized in that: In S200, the cavity formed by the combined box is preheated by starting to introduce hot air at 100-160° C. into the cavity from the opening of the cover box 4-6 hours before pouring until the pouring starts.
10. A method for casting a ship's tail shaft bracket according to claim 6, characterized in that: In S300, the preset pouring temperature is 1565±5°C, the preset pouring time is 145-185s, the preset number of supplementary pouring is 4 times, and the preset insulation time is 168h.