Gas pressure casting furnace body structure and furnace mold

Abstract

The present invention discloses a gas pressure casting furnace body structure and a furnace building mold. The furnace lining of the gas pressure casting furnace is constructed by refractory materials filled around the furnace building mold. After the furnace building mold is melted, the space occupied by it forms a furnace body inner cavity. The furnace body inner cavity includes a liquid inlet area formed by the liquid inlet part, a furnace area formed by the furnace part, and a liquid outlet area formed by the liquid outlet part. The top surface of the substrate boss arranged at the bottom of the furnace is not lower than the bottom surface of the furnace area. The furnace body structure disclosed by the present invention reduces the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the furnace by optimizing the shape structure, relevant dimensions and connection mode of the furnace body, reduces the waiting time of molten iron in the gas pressure furnace and the temperature drop range, thereby reducing the risk of residual Mg consumption and supercooling of molten iron, reducing the tendency of white cast iron, improving the metallurgical quality of molten iron, facilitating the cleaning of slag sticking to the tube wall, reducing production costs, and being suitable for popularization and application.

Description

Technical Field

[0001] The invention relates to a device for heat-insulating and pouring molten metal liquid by gas pressure, and in particular to a furnace body structure of a gas pressure pouring furnace. The invention also relates to a furnace building mold used in the furnace building process. Background Art

[0002] Casting technology is a traditional and mature basic manufacturing technology. Because of its maturity, any improvement is extremely difficult. In some aspects, it is difficult to make a breakthrough by relying solely on the casting process, and auxiliary tools are needed. Among them, the use of the gas pressure casting furnace is a key link in ensuring product quality. The amount of molten iron for pressure maintenance and the amount of molten iron for opening are large in the conventional gas pressure casting furnace (the amount of molten iron for pressure maintenance refers to the minimum amount of molten iron required to seal the furnace area from the outside world, and the amount of molten iron for opening is the minimum amount of molten iron required to start pouring). The molten iron waits for a long time in the gas pressure furnace, and the temperature drops significantly. During the waiting process, the consumption of residual Mg increases, and the risk of supercooling of the molten iron and the tendency of white cast iron increase, which affects the metallurgical quality of the molten iron and the product quality, and causes a certain waste of resources.

[0003] Therefore, it is necessary to optimize the lining structure of the traditional gas pressure casting furnace to reduce the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the gas pressure casting furnace, improve the metallurgical quality of the molten iron and product quality, reduce resource waste, and reduce the risk of fluctuations in production costs and product quality. Summary of the invention

[0004] In view of this, the first technical problem to be solved by the present invention is to provide a furnace body structure of a pneumatic casting furnace to reduce the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the pneumatic furnace, improve the metallurgical quality of the molten metal and the product quality, reduce resource waste, reduce production costs, and reduce the risk of fluctuations in product quality.

[0005] As a same concept, another technical problem to be solved by the present invention is to provide a furnace-building membrane used in the furnace-building process to form the furnace body cavity of the gas pressure casting furnace.

[0006] In order to solve the first technical problem mentioned above, the technical solution adopted by the present invention is: a pneumatic casting furnace mold, comprising: a liquid inlet part, a furnace part and a liquid outlet part, the liquid inlet part comprises a vertical liquid inlet pipe and a transverse liquid inlet pipe, the furnace part comprises a furnace cylinder, the furnace cylinder has a cylinder wall and a cylinder bottom, the liquid outlet part comprises a vertical liquid outlet pipe and a transverse liquid outlet pipe, the transverse liquid inlet pipe and the transverse liquid outlet pipe are respectively overlapped and fixed to the cylinder bottom from both sides, and there is a space between the transverse liquid inlet pipe and the transverse liquid outlet pipe for accommodating refractory materials when building the furnace.

[0007] Wherein, the bottom of the cylinder is provided with a recessed portion for accommodating refractory materials when building the furnace.

[0008] Wherein, the depth of the recessed portion is 25 to 35 mm.

[0009] Wherein, the recessed portion is a rectangular structure.

[0010] Among them, the horizontal liquid inlet pipe is in a trumpet shape, gradually expanding from its connection with the vertical liquid inlet pipe to its connection with the bottom of the cylinder; the horizontal liquid outlet pipe is in a trumpet shape, gradually expanding from its connection with the vertical liquid outlet pipe to its connection with the bottom of the cylinder.

[0011] Among them, the transition between the vertical liquid inlet pipe and the horizontal liquid inlet pipe has an oblique chamfer A, and the oblique chamfer A is 58°~62°. The transition between the vertical liquid outlet pipe and the horizontal liquid outlet pipe has an oblique chamfer B, and the oblique chamfer B is 58°~62°.

[0012] Among them, the end faces relative to the transverse liquid inlet pipe and the transverse liquid outlet pipe are both inclined, and the angle between the inclined end face of the transverse liquid inlet pipe and its transverse tube face is 100°~110°, and the angle between the inclined end face of the transverse liquid outlet pipe and its transverse tube face is 100°~110°.

[0013] Wherein, the vertical liquid inlet pipe is inclined and the vertical liquid outlet pipe is inclined.

[0014] Wherein, the diameter of the vertical liquid outlet pipe is smaller than the diameter of the vertical liquid inlet pipe.

[0015] As the same concept, the present invention provides a technical solution for solving the above-mentioned second technical problem, which is a gas pressure casting furnace body structure, including: a furnace lining, the furnace lining is located in the space surrounded by the furnace shell and the furnace bottom, the furnace lining is built with refractory materials filled around the furnace mold, and the refractory materials filled in the space between the horizontal liquid inlet pipe and the horizontal liquid outlet pipe and located below the furnace barrel are built into a substrate boss, and the substrate boss is a part of the furnace lining; after the furnace mold is melted, the The space occupied by the furnace mold forms an inner cavity of the furnace body, and the inner cavity of the furnace body includes a liquid inlet area formed by the liquid inlet portion, a furnace area formed by the furnace portion, and a liquid outlet area formed by the liquid outlet portion. The vertical liquid inlet pipe forms a vertical liquid inlet channel, the horizontal liquid inlet pipe forms a horizontal liquid inlet channel, the vertical liquid outlet pipe forms a vertical liquid outlet channel, and the horizontal liquid outlet pipe forms a horizontal liquid outlet channel. The horizontal liquid inlet channel and the horizontal liquid outlet channel are respectively connected to the furnace area, and the top surface of the substrate boss is not lower than the bottom surface of the furnace area.

[0016] After adopting the above technical solution, the technical effects achieved by the present invention are:

[0017] First of all, from the perspective of the furnace body structure, since a substrate boss is provided at the bottom of the furnace, after the furnace building mold is melted, the top surface of the substrate boss is not lower than the bottom surface of the furnace chamber area (the preferred method is that the substrate boss extends into the furnace chamber area). After the molten metal (such as molten iron) is injected from the liquid inlet area, the substrate boss will occupy a certain space, thereby reducing the amount of molten iron maintaining pressure and the amount of molten iron for initial pouring in the gas pressure casting furnace, thereby reducing the waiting time of the molten iron in the furnace and the temperature drop range, reducing the residual Mg consumption and the risk of supercooling of molten iron, reducing the tendency of white cast iron, improving the metallurgical quality of molten iron, facilitating the cleaning of slag sticking to the tube wall, and reducing production costs.

[0018] Secondly, since the transition between the vertical liquid inlet pipe and the horizontal liquid inlet pipe of the furnace building mold, as well as the transition between the vertical liquid outlet pipe and the horizontal liquid outlet pipe, both have oblique chamfers, the opposite end faces of the horizontal liquid inlet pipe and the horizontal liquid outlet pipe are inclined. When the furnace building mold is melted, the furnace lining at the transition between the vertical liquid inlet channel and the horizontal liquid inlet channel, as well as the transition between the vertical liquid outlet channel and the horizontal liquid outlet channel, forms a chamfered structure, and the substrate boss forms a prism structure, which is beneficial to the flow of molten metal and convenient for cleaning the slag accumulated here. Moreover, the trumpet-mouth structure of the horizontal liquid inlet pipe / horizontal liquid outlet pipe can reduce slag accumulation and reduce the impact of molten iron on the substrate boss.

[0019] Furthermore, from the perspective of the furnace mold, the furnace barrel has a barrel wall and a barrel bottom, and the barrel bottom is provided with a recessed portion. When building the furnace, refractory material will be filled into the recessed portion, so that after the furnace mold is melted, the top of the substrate boss extends into the furnace area, ensuring that the substrate boss occupies maximum space, reducing the impact of the furnace building process error on the space occupied by the substrate boss, and thereby minimizing the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the furnace (if the top surface of the substrate boss is lower than the bottom surface of the furnace area, the space between the two is not fully utilized, thereby reducing the space occupied by the substrate boss). BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of an embodiment of a gas pressure pouring furnace mold of the present invention;

[0021] Figure 2 yes Figure 1 A top view of

[0022] Figure 3 It is a structural cross-sectional view of an embodiment of a gas pressure casting furnace body structure of the present invention;

[0023] Among them: 11A, vertical liquid inlet pipe; 11B, vertical liquid inlet channel; 12A, horizontal liquid inlet pipe; 12B, horizontal liquid inlet channel; 21A, vertical liquid outlet pipe; 21B, vertical liquid outlet channel; 22A, horizontal liquid outlet pipe; 22B, horizontal liquid outlet channel; 30A, furnace barrel; 30B, furnace area; 31A, recessed portion; 40, furnace lining; 41A, space for accommodating refractory materials; 41B, substrate boss; 42, liquid inlet; 43, liquid outlet; 50, furnace bottom; 60, furnace shell; 70, energized coil; 80, furnace cover. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 and Figure 2 A gas pressure casting furnace mold is shown together, including a liquid inlet part, a furnace part and a liquid outlet part, the liquid inlet part includes a vertical liquid inlet pipe 11A and a transverse liquid inlet pipe 12A, the furnace part includes a furnace barrel 30A, the furnace barrel 30A has a barrel wall and a barrel bottom, the liquid outlet part includes a vertical liquid outlet pipe 21A and a transverse liquid outlet pipe 22A, the transverse liquid inlet pipe 12A and the transverse liquid outlet pipe 22A are overlapped and fixed to the barrel bottom from both sides respectively, and a space 41A for accommodating refractory materials when building the furnace is provided between the transverse liquid inlet pipe 12A and the transverse liquid outlet pipe 22A. In one example, the width E of the overlapped area is 610 mm, and the maximum diameter depth F is 223 mm. After the furnace mold is melted, this part of the area forms a connecting channel.

[0026] from Figure 2 It can be seen that the horizontal liquid inlet pipe 12A is in the shape of a bell mouth, which gradually expands from its connection with the vertical liquid inlet pipe 11A to its connection with the bottom of the cylinder, and the horizontal liquid outlet pipe 22A is in the shape of a bell mouth, which gradually expands from its connection with the vertical liquid outlet pipe 21A to its connection with the bottom of the cylinder. The bell mouth structure can reduce slag accumulation and reduce the impact of molten iron on the substrate boss.

[0027] Preferably, in order to facilitate cleaning of sticky residue and pouring operation, the vertical liquid inlet pipe 11A and the vertical liquid outlet pipe 21A are arranged to be inclined.

[0028] Preferably, the bottom of the cylinder is provided with a recessed portion 31A for accommodating refractory materials when building the furnace, the depth of the recessed portion is 25 to 35 mm, and the recessed portion 31A is a rectangular structure. In one example, the dimensions are 629 mm in length, 610 mm in width, and 30 mm in depth.

[0029] Preferably, the transition between the vertical liquid inlet pipe 11A and the horizontal liquid inlet pipe 12A has a chamfered angle A, and the chamfered angle A is 58° to 62°, and more preferably 60°; the transition between the vertical liquid outlet pipe 21A and the horizontal liquid outlet pipe 22A has a chamfered angle B, and the chamfered angle B is 58° to 62°, and more preferably 60°.

[0030] Preferably, the end faces of the lateral liquid inlet pipe 12A and the lateral liquid outlet pipe 22A are both inclined, and the angle C between the inclined end face of the lateral liquid inlet pipe 12A and its lateral pipe face is 100° to 110°, preferably 105°, and the angle D between the inclined end face of the lateral liquid outlet pipe 22A and its lateral pipe face is 100° to 110°, preferably 105°. The optimization of the above-mentioned shape structure is conducive to the flow of molten metal and convenient for cleaning the slag gathered here.

[0031] Preferably, the diameter of the vertical liquid outlet pipe 21A is smaller than the diameter of the vertical liquid inlet pipe 11A. On the one hand, the small diameter of the liquid outlet pipe can reduce the amount of molten iron to be poured; on the other hand, during normal use, the density of molten iron is greater than the density of slag. When molten iron is poured, slag is brought in, most of which floats on the surface of the molten iron in the liquid inlet pipe and sticks to the pipe wall over time. The large diameter of the liquid inlet pipe is convenient for cleaning the sticky slag, and there is relatively less slag at the liquid outlet pipe, so the diameter can be relatively reduced.

[0032] Figure 3 The invention shows a lining structure of a gas pressure casting furnace built by using the above-mentioned furnace building mold. The furnace shell 60 is wound with an energized coil 70, and a furnace cover 80 is arranged on the top of the furnace lining 40. Gas is introduced into the furnace area 30B from the furnace cover 80 or the furnace lining 40. When building the furnace, the above-mentioned furnace building mold is first positioned and fixed in the space surrounded by the furnace shell 60 and the furnace bottom 50. Then, refractory materials are filled into the space around the furnace building mold. After furnace baking and sintering, the refractory materials around the furnace building mold are built into the furnace lining 40. The substrate boss 41B is a part of the furnace lining 40, which is built by the refractory materials filled in the space between the horizontal liquid inlet pipe 12A and the horizontal liquid outlet pipe 22A and located below the furnace barrel 30A. The furnace lining 40 works continuously under high temperature without deformation. The furnace building mold does not need to be taken out. It will melt into the molten iron during the furnace baking smelting process and be used as a smelting raw material. The furnace construction process of the gas pressure casting furnace is well known to ordinary technicians in this field and will not be described in detail here.

[0033] After the furnace mold is melted, the space occupied by the furnace mold forms a furnace body cavity, and the furnace body cavity includes a liquid inlet area formed by the liquid inlet portion, a furnace area 30B formed by the furnace portion, and a liquid outlet area formed by the liquid outlet portion. The vertical liquid inlet pipe 11A forms a vertical liquid inlet channel 11B, and the vertical liquid inlet channel 11B is connected to the liquid inlet port 42. The horizontal liquid inlet pipe 12A forms a horizontal liquid inlet channel 12B, and the vertical liquid outlet pipe 21A forms a vertical liquid outlet channel 21B. The liquid outlet 21B is connected to the liquid outlet port 43, the horizontal liquid outlet pipe 22A forms a horizontal liquid outlet 22B, the horizontal liquid inlet channel 12B and the horizontal liquid outlet 22B are respectively connected to the furnace area 30B, the top surface of the substrate boss 41B is not lower than the bottom surface of the furnace area 30B, and preferably, the substrate boss 41B extends into the furnace area 30B, for example 25 to 35 mm, and the extension degree is determined by the depth of the recessed portion 31A set at the bottom of the furnace barrel 30A.

[0034] From the perspective of the furnace body structure, since a substrate boss 41B is provided at the bottom of the furnace, after the furnace building mold is melted, the top surface of the substrate boss is not lower than the bottom surface of the furnace area (preferably extending into the furnace area). After the molten metal (such as molten iron) is injected from the liquid inlet area, the substrate boss 41B will occupy a certain space, thereby reducing the amount of molten iron maintaining pressure and the amount of molten iron for initial pouring in the gas pressure casting furnace, reducing the waiting time of the molten iron in the furnace and the temperature drop range, reducing the residual Mg consumption and the risk of supercooling of molten iron, reducing the tendency of white cast iron, improving the metallurgical quality of molten iron, stabilizing the production process and product quality, and reducing production costs.

[0035] From the perspective of furnace building mold, the furnace barrel 30A has a barrel wall and a barrel bottom, and the barrel bottom is provided with a recessed portion 31A. When building the furnace, refractory material will be filled into the recessed portion 31A, so that after the furnace building mold is melted, the top of the substrate boss extends into the furnace area, ensuring that the substrate boss occupies maximum space, reducing the impact of the furnace building process error on the space occupied by the substrate boss, and thereby minimizing the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the furnace (if the top of the substrate boss is lower than the bottom surface of the furnace area surrounding the furnace area, the space between the two is not fully utilized, thereby reducing the space occupied by the substrate boss).

[0036] Taking a 7-ton gas pressure pouring furnace as an example, the following table lists the comparison of the pressure-maintaining molten iron volume and the initial pouring molten iron volume between the gas pressure pouring furnace using the furnace structure of the present invention and the traditional gas pressure pouring furnace of the same specification:

[0037]

[0038] From the above comparison, it can be found that the furnace body structure of the gas pressure casting furnace disclosed in the present invention reduces the amount of molten iron for pressure maintenance and the amount of molten iron for initial pouring in the gas pressure casting furnace by optimizing the shape structure, relevant dimensions and connection method of the furnace body, reduces the waiting time of molten iron in the gas pressure furnace and the temperature drop range, thereby reducing the risk of residual Mg consumption and supercooling of molten iron, reducing the tendency of white cast iron, improving the metallurgical quality of molten iron, facilitating the cleaning of slag sticking to the tube wall, reducing production costs, and being suitable for popularization and application.

[0039] The present invention is not limited to the above-mentioned embodiments. For example, the gas pressure casting furnace body structure provided by the present invention can also be used for heat preservation casting of other metals (such as aluminum alloys). All improvements based on the concept, structure, method and principle of the present invention will fall within the protection scope of the present invention.

Claims

1. A gas pressure casting furnace mold. include: The liquid inlet part, the furnace part and the liquid outlet part are characterized in that the liquid inlet part includes a vertical liquid inlet pipe and a horizontal liquid inlet pipe, the furnace part includes a furnace barrel, the furnace barrel has a barrel wall and a barrel bottom, the liquid outlet part includes a vertical liquid outlet pipe and a horizontal liquid outlet pipe, the horizontal liquid inlet pipe and the horizontal liquid outlet pipe are overlapped and fixed to the barrel bottom from both sides respectively, and there is a space between the horizontal liquid inlet pipe and the horizontal liquid outlet pipe for accommodating refractory materials when building the furnace; The bottom of the cylinder is provided with a recessed portion for accommodating refractory materials when building the furnace; The horizontal liquid inlet pipe is in a bell-mouth shape, and gradually expands from the connection between it and the vertical liquid inlet pipe to the connection between it and the bottom of the cylinder; the horizontal liquid outlet pipe is in a bell-mouth shape, and gradually expands from the connection between it and the vertical liquid outlet pipe to the connection between it and the bottom of the cylinder; The transition between the vertical liquid inlet pipe and the horizontal liquid inlet pipe has an oblique chamfer A, and the transition between the vertical liquid outlet pipe and the horizontal liquid outlet pipe has an oblique chamfer B; The end surfaces of the transverse liquid inlet pipe and the transverse liquid outlet pipe opposite to each other are both inclined; The vertical liquid inlet pipe is inclined, and the vertical liquid outlet pipe is inclined; The diameter of the vertical liquid outlet pipe is smaller than the diameter of the vertical liquid inlet pipe.

2. The gas pressure pouring furnace mold according to claim 1, It is characterized in that The depth of the recessed portion is 25 to 35 mm.

3. The gas pressure pouring furnace mold according to claim 2, It is characterized in that The recessed portion is a rectangular structure.

4. The gas pressure pouring furnace mold according to claim 1, It is characterized in that The chamfer angle A is 58° to 62°, and the chamfer angle B is 58° to 62°.

5. The gas pressure pouring furnace mold according to claim 1, It is characterized in that The angle between the inclined end face of the transverse liquid inlet pipe and its transverse tube surface is 100° to 110°, and the angle between the inclined end face of the transverse liquid outlet pipe and its transverse tube surface is 100° to 110°.

6. A gas pressure casting furnace body structure, include: The furnace lining is located in the space enclosed by the furnace shell and the furnace bottom, and is characterized in that: The furnace lining is constructed by the refractory material filled around the gas pressure casting furnace mold according to any one of claims 1 to 5, and the refractory material filled in the space between the horizontal liquid inlet pipe and the horizontal liquid outlet pipe and located below the furnace barrel is constructed into a substrate boss, and the substrate boss is a part of the furnace lining; after the gas pressure casting furnace mold is melted, the space occupied by the gas pressure casting furnace mold forms a furnace body inner cavity, and the furnace body inner cavity includes a liquid inlet area formed by the liquid inlet part, a furnace body area formed by the furnace body part, and a liquid outlet area formed by the liquid outlet part, the vertical liquid inlet pipe forms a vertical liquid inlet channel, the horizontal liquid inlet pipe forms a horizontal liquid inlet channel, the vertical liquid outlet pipe forms a vertical liquid outlet channel, and the horizontal liquid outlet pipe forms a horizontal liquid outlet channel. The horizontal liquid inlet channel and the horizontal liquid outlet channel are respectively connected to the furnace body area, and the top surface of the substrate boss is not lower than the bottom surface of the furnace body area.

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