Manufacturing process for rapid crusting of core

Abstract

The invention provides a manufacturing process for rapid crusting of a core, and relates to the technical field of core shooting. Comprising the steps that an air compressor is started, and compressed air output by the air compressor enters a first output pipeline and a second output pipeline; sand grains are output to a first output pipeline through the first sand box, and sand grains are output to a second output pipeline through the second sand box; gas output by the first output pipeline is mixed with sand grains output by the first sand box and then enters the first sand shooting cylinder; gas output by the second output pipeline carries sand grains output by the second sand box and then enters the second sand shooting cylinder; the first sand shooting cylinder and the second sand shooting cylinder are used for shooting sand into the mold through a first annular sand hole and a second circular sand hole in the mold respectively; and heating the sand grains in the mold by using a heating device outside the mold so as to enable the sand grains to crust. The embodiment of the invention provides a manufacturing process for rapid crusting of a core. The crusting speed of the core can be increased.

Description

Technical Field

[0001] The invention relates to the technical field of core shooting, and in particular to a manufacturing process for rapid core encrustation. Background Art

[0002] Core shooting technology is a process that uses a core shooting machine to quickly shape sand particles in a mold.

[0003] In the related art, sand is injected into a mold through a core shooting device, so that the mold is quickly filled with sand, the sand is mixed with a thermosetting resin, and the sand is heated to obtain a core formed by a sand crust. However, since it takes a certain amount of time for the sand to be heated and cured, the speed of the crust formation is limited. Summary of the invention

[0004] The embodiment of the present invention provides a manufacturing process for rapid core encrustation, which can improve the speed of core encrustation. The technical solution of the present invention is as follows: A core rapid crusting manufacturing process, comprising: Turn on the air compressor so that the compressed air outputted by the air compressor enters the first output pipe and the second output pipe respectively; wherein the cross-sectional area of ​​the first output pipe gradually decreases along the gas flow direction so as to increase the pressure and temperature of the compressed air inside the first output pipe; Outputting sand to the first output pipe using a first sand box, and outputting sand to the second output pipe using a second sand box; The gas outputted from the first output pipeline is mixed with the sand outputted from the first sand box and then enters the first sand-shooting tube; wherein the first sand-shooting tube comprises an inner tube and an outer tube both in a cylindrical shape, a space formed between the inner tube and the outer tube is connected to the first output pipeline, and one end of the first sand-shooting tube is surrounded by the outer tube and the inner tube to form an annular outlet so as to eject an annular sand beam; The gas outputted from the second output pipeline carries the sand outputted from the second sand box and enters the second sand-shooting tube; wherein the second sand-shooting tube passes through the inner tube, and the outlet of the second sand-shooting tube is circular so as to spray a circular sand column in the annular sand beam; The first sand-shooting cylinder and the second sand-shooting cylinder shoot sand into the mold through a first annular sand hole and a second circular sand hole on the mold respectively; The sand particles in the mold are heated by a heating device outside the mold to form a crust.

[0005] Optionally, the inner cylinder and the outer cylinder both include a conical portion and a cylindrical portion along the axis.

[0006] Optionally, a heating chamber is provided outside the mold, the heating chamber is filled with water, and the heating device comprises a microwave device; The method of heating the sand in the mold by a heating device outside the mold to form a crust comprises: The microwave device is used to apply microwaves into the heating chamber to heat the heating chamber, and the heating chamber heats the mold wrapped therein and the sand grains therein to form a crust.

[0007] Optionally, the mold is provided with an exhaust hole, a filter screen is installed on the exhaust hole, the mesh of the filter screen is smaller than the particle size of the sand particles, the exhaust hole is connected to the heating bin through an atomizing pipe, a piston device is provided in the atomizing pipe, the piston device divides the atomizing pipe into two parts, a part of the atomizing pipe connected to the exhaust hole is a gas phase, a part of the atomizing pipe connected to the heating bin is a water phase, and the atomizing pipe is connected to the heating bin through an atomizing nozzle; The gas discharged from the exhaust hole pushes the piston device to spray the water in the atomization pipeline into the heating chamber through the atomization nozzle.

[0008] Optionally, the piston device includes a shell, a first piston and a second piston, the shell includes a first part and a second part that are interconnected, the cross-sectional area of ​​the first part is smaller than the cross-sectional area of ​​the second part, the first piston is slidingly sealed and installed in the first part, the second piston is slidingly sealed and installed in the second part, and the space formed by the first piston, the second piston and the shell is filled with liquid.

[0009] Optionally, a pressure relief valve is installed on the atomization pipeline.

[0010] Optionally, the outlets of the first sand box and the second sand box are both provided with baffles to adjust the sand output of the two.

[0011] Optionally, the sand grains in the first sand box and the second sand box contain phenolic resin.

[0012] Optionally, flow regulating valves are installed on the first output pipeline and the second output pipeline.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: In this embodiment, by setting the first output pipe to gradually reduce the cross-sectional area along the gas flow direction, the compressed air entering the first output pipe can be pressurized and heated, and then the sand particles flowing into the first output pipe can be preheated. After the high-temperature and high-pressure gas output by the first output pipe carries the preheated sand particles into the first sand shooting tube, the annular sand beam ejected by the first sand shooting tube is output to the mold and mainly distributed around the mold. The sand particles output by the second output pipe enter the second sand shooting tube, and the circular sand column ejected by the second sand shooting tube fills the middle of the mold, and finally a sand core with preheated sand particles on the outside and normal sand particles in the middle is obtained in the mold. The sand particles around the mold are heated by the heating device to form a shell, and the preheated sand particles can be heated and crusted faster under the action of the heating device, thereby increasing the speed of core crusting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a core rapid shelling device provided in an embodiment of the present invention.

[0016] In the figure: 1- Air compressor; 11- first output pipeline; 12- second output pipe; 2-First sand box; 3- Second sand box; 4- the first sand shooting tube; 41-inner cylinder; 42-Outer cylinder; 5- the second sand-shooting tube; 6- Heating chamber; 7- Microwave device; 8- Mould; 81- Exhaust hole; 9- atomization pipe; 91-piston device; 911-1st piston; 912 - second piston; 913-housing; 92- atomizing nozzle; 93-Pressure relief valve. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a manufacturing process for rapid core encrustation, which is implemented by a rapid core encrustation device, including: The air compressor 1 is turned on, and the compressed air outputted by the air compressor 1 enters the first output pipe 11 and the second output pipe 12 respectively; wherein the cross-sectional area of ​​the first output pipe 11 gradually decreases along the gas flow direction, so as to increase the pressure and temperature of the compressed air inside the first output pipe 11; The first sand box 2 is used to output sand to the first output pipe 11, and the second sand box 3 is used to output sand to the second output pipe 12; The gas outputted from the first output pipeline 11 is mixed with the sand outputted from the first sand box 2 and then enters the first sand-shooting tube 4; wherein the first sand-shooting tube 4 comprises an inner tube 41 and an outer tube 42 both in a cylindrical shape, a space formed between the inner tube 41 and the outer tube 42 is connected to the first output pipeline 11, and one end of the first sand-shooting tube 4 is surrounded by the outer tube 42 and the inner tube 41 to form an annular outlet so as to eject an annular sand beam; The gas outputted from the second output pipe 12 carries the sand outputted from the second sand box 3 and enters the second sand shooting tube 5; wherein the second sand shooting tube 5 passes through the inner tube 41, and the outlet of the second sand shooting tube 5 is circular so as to spray out a circular sand column in the annular sand beam; The first sand-shooting tube 4 and the second sand-shooting tube 5 shoot sand into the mold 8 through the first annular sand hole and the second circular sand hole on the mold 8 respectively; The sand grains in the mold 8 are heated by a heating device outside the mold 8 to form a crust.

[0019] In this embodiment, the high-pressure air generated by the air compressor 1 is output through the first output pipe 11 and the second output pipe 12 respectively, and the sand particles in the first sand box 2 and the second sand box 3 flow into the first output pipe 11 and the second output pipe 12 respectively under the action of gravity. Among them, since the cross-sectional area (pipe diameter) of the first output pipe 11 gradually decreases along the gas flow direction, that is, the pipe space gradually decreases, the high-pressure gas is continuously accumulated and squeezed in the process of flowing in the first output pipe 11, and then gradually heats up. After the gas in the first output pipe 11 heats up, it transfers heat to the sand particles to preheat the sand particles. The high-temperature and high-pressure gas output by the first output pipe 11 carries the preheated sand particles into the first sand shooting tube 4. The internal space surrounded by the inner tube 41 and the outer tube 42 of the first sand shooting tube 4 is a hollow column, and the internal space is small. Compared with the conventional cylindrical structure, it will not cause excessive pressure reduction and temperature reduction due to the sudden increase of the space after the gas and solid phases in the first output pipe 11 flow in, so as to keep the temperature and pressure of the solid and gas phases relatively stable. The annular outlet of the first sand-shooting tube 4 can output an annular sand beam, which is a sand beam preheated by the first output pipe 11. After being output into the mold 8, it is mainly distributed around the mold 8. The sand grains output by the second output pipe 12 enter the second sand-shooting tube 5, which is installed in the middle of the first sand-shooting tube 4, that is, the second sand-shooting tube 5 is inserted into the space in the middle of the first sand-shooting tube 4. The circular sand column shot by the second sand-shooting tube 5 fills the middle of the mold 8, and finally a sand core with preheated sand grains on the outside and normal sand grains in the middle is obtained in the mold 8. The sand grains around the mold 8 are used to be heated by the heating device to form a crust. The preheated sand grains can be heated to the preset temperature (crusting temperature 150~350℃) faster under the action of the heating device.

[0020] It should be noted that the sand in the first sand box 2 is initially dispersed in the first output pipe 11 to facilitate uniform heating. As the pipe diameter decreases, the sand gradually becomes denser and finally enters the first sand shooting tube 4 in a relatively dense state for sand shooting.

[0021] It can be understood that, relative to the second output pipeline 12, since the first output pipeline 11 needs to further compress the air for heating, two air compressors 1 can be connected to the first output pipeline 11 and the second output pipeline 12 respectively, wherein the compressor connected to the first output pipeline 11 can be a high-power compressor.

[0022] It should be noted that since the first sand box 2 and the second sand box 3 are sealed, the high-pressure gas in the first output pipe 11 and the second output pipe 12 cannot enter the first sand box 2 and the second sand box 3 and then be discharged into the atmosphere. Therefore, the high-pressure gas will not continue to enter the first sand box 2 and the second sand box 3 to form airflow to hinder the falling of sand particles.

[0023] It is understandable that the shapes of the first sand-shooting tube 4, the second sand-shooting tube 5 and the mold 8 can be adjusted according to actual conditions. For example, the first sand-shooting tube 4 and the second sand-shooting tube 5 can be as shown in the attached figure. Figure 1 The cylindrical structure shown in FIG. 1 may also be an elliptical cylinder or a square cylinder. For example, the mold 8 may be as shown in FIG. Figure 1 The rectangular parallelepiped shown may also be a cylinder, etc.

[0024] In this embodiment, the outlets of the first sand-shooting tube 4 and the second sand-shooting tube 5 can be provided with an openable and closable baffle, and micropores that are air-permeable but not sand-permeable can be provided on the baffle, so that the first sand-shooting tube 4 and the second sand-shooting tube 5 can first accumulate a certain amount of sand particles, and then open the baffle to shoot sand. The outlets of the first sand-shooting tube 4 and the second sand-shooting tube 5 can also be provided with rubber rings to achieve sealing contact between them and the first sand hole and the second sand hole of the mold 8. Of course, the rubber ring can also be provided in the first sand hole and the second sand hole.

[0025] In some embodiments of the present invention, both the inner cylinder 41 and the outer cylinder 42 include a conical portion and a cylindrical portion along the axis.

[0026] In this embodiment, after the sand enters the conical part, some of the sand will spirally slide downward in the space between the conical part of the inner cylinder 41 and the conical part of the outer cylinder 42. During the sliding process, the linear velocity of the sand will increase due to the gradual reduction of the circumference of the spiral motion, and the friction between the sand and the cylinder wall will also increase the temperature of the sand. Preferably, the outlet of the first output pipe 11 is connected obliquely downward to the conical space of the first sand-shooting cylinder 4, and a spiral track plate or a spiral groove can also be provided to limit the spiral motion of the sand. The cylindrical parts of the outer cylinder 42 and the inner cylinder 41 form a cylindrical space, which is connected to the end with a smaller diameter of the conical space, which is conducive to the sand gathering here. The shape of the cylindrical space facilitates the sand inside it to form a stable annular sand beam downward.

[0027] In some embodiments of the present invention, a heating chamber 6 is disposed outside the mold 8, the heating chamber 6 is filled with water, and the heating device includes a microwave device 7; The sand in the mold 8 is heated by a heating device outside the mold 8 to form a crust, including: The microwave device 7 is used to apply microwaves into the heating chamber 6 to heat the heating chamber 6, and the heating chamber 6 heats the mold 8 wrapped therein and the sand grains therein to form a crust.

[0028] In this embodiment, microwaves are convenient for rapidly heating water molecules. Water is added to the heating chamber 6. The water may fill the heating chamber 6 or may not fill the heating chamber 6. The water in the heating chamber 6 can be rapidly heated by the microwave device 7, and then the heat is transferred to the sand core to rapidly form a crust. Microwave heating is more energy-efficient and has a faster heating speed.

[0029] In some embodiments of the present invention, the mold 8 is provided with an exhaust hole 81, a filter screen is installed on the exhaust hole 81, the mesh of the filter screen is smaller than the particle size of the sand, the exhaust hole 81 is connected to the heating bin 6 through the atomizing pipe 9, a piston device 91 is provided in the atomizing pipe 9, the piston device 91 divides the atomizing pipe 9 into two parts, a part of the atomizing pipe 9 connected to the exhaust hole 81 is a gas phase, a part of the atomizing pipe 9 connected to the heating bin 6 is a water phase, and the atomizing pipe 9 is connected to the heating bin 6 through the atomizing nozzle 92; The gas discharged from the exhaust hole 81 pushes the piston device 91 to spray the water in the atomization pipeline 9 into the heating chamber 6 through the atomization nozzle 92.

[0030] In this embodiment, after the sand fills the mold 8, the air compressor 1 is still used to pressurize the sand in the mold 8. In order to prevent the pressure in the mold 8 from being too high, the exhaust hole 81 is used to discharge the excess air pressure through the exhaust hole 81, so that the pressure in the mold 8 is kept within a certain range. In the embodiment of the present invention, the exhaust hole 81 is connected to the atomization pipeline 9, and the excess air pressure enters the atomization pipeline 9 through the exhaust hole 81. The atomization pipeline 9 is provided with a piston device 91. The air pressure is transmitted to the atomization pipeline 9 filled with water through the piston device 91. The piston device 91 presses the water in the atomization pipeline 9 to be sprayed into the heating chamber 6 through the atomization nozzle 92. The atomized water is more likely to fill the heating chamber 6 and is more likely to heat up evenly and quickly under the action of the microwave device 7. In addition, in addition to providing pressure atomization, the piston device 91 can also pressurize the heating chamber 6 to further increase its heating rate. The pressure discharged from the exhaust hole 81 can also be recycled to reduce energy consumption.

[0031] It should be noted that the heating chamber 6 can be in any shape that adapts to the mold 8 and is wrapped outside the mold 8. In order to clearly express the connection relationship, the present invention only shows a partial part of the heating chamber 6 in a simple shape.

[0032] In some embodiments of the present invention, the piston device 91 includes a shell 913, a first piston 911 and a second piston 912, the shell 913 includes a first part and a second part that are interconnected, the cross-sectional area of ​​the first part is smaller than the cross-sectional area of ​​the second part, the first piston 911 is slidingly sealed and installed in the first part, the second piston 912 is slidingly sealed and installed in the second part, and the space formed by the first piston 911, the second piston 912 and the shell 913 is filled with liquid.

[0033] In this embodiment, the piston device 91 needs to both atomize and pressurize the heating chamber 6, and the required pressure is relatively high. Therefore, the first piston 911 and the second piston 912 are set to have different areas. By utilizing the difference in area between the two and through the hydraulic principle, the pressure on the first piston 911 is transferred to the second piston 912 exponentially, so that it has sufficient pressure.

[0034] In some embodiments of the present invention, a pressure relief valve 93 is installed on the atomization pipeline 9 .

[0035] In some embodiments of the present invention, baffles are provided at the outlets of the first sand box 2 and the second sand box 3 to adjust the sand output of the two.

[0036] In this embodiment, during the pressure-maintaining and heating stage after the sandblasting is completed, the first flask 2 and the second flask 3 can be completely blocked by a baffle.

[0037] In some embodiments of the present invention, the sand particles in the first flask 2 and the second flask 3 contain phenolic resin.

[0038] In some embodiments of the present invention, flow regulating valves are installed on the first output pipeline 11 and the second output pipeline 12 .

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for making a core rapid crust, characterized in that: include: Turning on the air compressor (1) so that the compressed air outputted by the air compressor enters the first output pipe (11) and the second output pipe (12) respectively; wherein the cross-sectional area of ​​the first output pipe (11) gradually decreases along the gas flow direction so that the compressed air inside the first output pipe is pressurized and heated; Using the first sand box (2) to output sand to the first output pipe (11), and using the second sand box (3) to output sand to the second output pipe (12); The gas outputted from the first output pipe (11) mixes with the sand outputted from the first sand box (2) and then enters the first sand-shooting tube (4); wherein the first sand-shooting tube (4) comprises an inner tube (41) and an outer tube (42) both of which are in a cylindrical shape, the space formed between the inner tube (41) and the outer tube (42) being in communication with the first output pipe (11), and one end of the first sand-shooting tube (4) is surrounded by the outer tube (42) and the inner tube (41) to form an annular outlet so as to eject an annular sand beam; The gas outputted from the second output pipe (12) carries the sand outputted from the second sand box (3) and enters the second sand-shooting tube (5); wherein the second sand-shooting tube (5) passes through the inner tube (41), and the outlet of the second sand-shooting tube (5) is circular so as to spray out a circular sand column in the annular sand beam; The first sand-shooting cylinder (4) and the second sand-shooting cylinder (5) respectively shoot sand into the mold (8) through a first annular sand hole and a second circular sand hole on the mold (8); The sand grains in the mold (8) are heated by a heating device outside the mold (8) to form a crust.

2. A process for making a core rapid crust according to claim 1, characterized in that: The inner cylinder (41) and the outer cylinder (42) both include a conical portion and a cylindrical portion along the axis.

3. The process for making a core rapid crust according to claim 1, characterized in that: A heating chamber (6) is disposed outside the mold (8), the heating chamber (6) is filled with water, and the heating device comprises a microwave device (7); The step of heating the sand in the mold (8) by using a heating device outside the mold (8) to form a crust comprises: The microwave device (7) is used to apply microwaves into the heating chamber (6) to heat the heating chamber (6), and the heating chamber (6) heats the mold (8) wrapped therein and the sand grains therein to form a crust.

4. A process for making a core rapid crust according to claim 3, characterized in that: The mold (8) is provided with an exhaust hole (81), a filter screen is installed on the exhaust hole (81), the mesh of the filter screen is smaller than the particle size of the sand particles, the exhaust hole (81) is connected to the heating chamber (6) through an atomizing pipe (9), a piston device (91) is provided in the atomizing pipe (9), the piston device (91) divides the atomizing pipe (9) into two parts, the part of the atomizing pipe (9) connected to the exhaust hole (81) is a gas phase, and the part of the atomizing pipe (9) connected to the heating chamber (6) is a water phase, and the atomizing pipe (9) is connected to the heating chamber (6) through an atomizing nozzle (92); The gas discharged from the exhaust hole (81) pushes the piston device (91) to spray the water in the atomization pipeline (9) into the heating chamber (6) through the atomization nozzle (92).

5. A process for making a core rapid crust according to claim 4, characterized in that: The piston device (91) comprises a housing (913), a first piston (911) and a second piston (912); the housing (913) comprises a first part and a second part which are interconnected; the cross-sectional area of ​​the first part is smaller than the cross-sectional area of ​​the second part; the first piston (911) is installed in the first part in a sliding seal; the second piston (912) is installed in the second part in a sliding seal; and a space formed by the first piston (911), the second piston (912) and the housing (913) is filled with liquid.

6. A process for making a core rapid crust according to claim 4, characterized in that: A pressure relief valve (93) is installed on the atomization pipeline (9).

7. The process for making a core rapid crust according to claim 1, characterized in that: The outlets of the first sand box (2) and the second sand box (3) are both provided with baffles to adjust the sand output of the two.

8. The process for making a core rapid crust according to claim 1, characterized in that: The sand particles in the first sand box (2) and the second sand box (3) contain phenolic resin.

9. The process for making a core rapid crust according to claim 1, characterized in that: Flow regulating valves are installed on the first output pipeline (11) and the second output pipeline (12).

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