Vacuum pouring tank for gypsum mold casting

Abstract

The utility model belongs to the field of casting equipment, and discloses a vacuum pouring tank for gypsum mold casting, which comprises a tank body, and a sealing partition plate for dividing an inner cavity of the tank body into an upper sealing tank and a lower sealing tank is fixedly arranged in the tank body; the upper sealing tank and the lower sealing tank are respectively provided with a vacuumizing pipe and a pressure relief pipe, and the upper sealing tank is provided with a pressurizing pipe; the upper sealing tank is provided with a pouring mechanism and a diversion trench; a jacking device is arranged in the lower sealing tank, and a jacking mechanism of the jacking device is fixedly connected with a first supporting plate used for bearing the shell sand box; a pouring hole penetrating through the upper sealing tank and the lower sealing tank is formed in the sealing partition plate; and the pouring hole corresponds to an outlet of the diversion trench and a pouring port of the shell sand box. The sealing partition plate and the jacking mechanism for jacking the shell sand box and making tight contact with the sealing partition plate are arranged in the vacuum pouring tank, so that in the pressurization process, only a pouring opening of the shell sand box can be pressurized by pressurized gas, and therefore the purposes of improving the fluidity of pouring liquid, promoting forming of thin-wall complex castings and improving the production efficiency are achieved. And meanwhile, the quality and density of the casting are improved.

Description

Technical Field

[0001] The utility model belongs to the field of casting equipment, in particular to a vacuum pouring pot for gypsum casting. Background Art

[0002] In traditional plaster casting, the vacuum casting tank structure is usually as follows Figure 1 As shown, it includes a tank body 1, a vacuum pipe 2, a pressure relief pipe 3, and a pressurizing pipe 4 leading to the interior of the tank body, a pouring mechanism (conventional mechanism, omitted in the figure) and a guide groove 5 are provided in the upper part of the tank body, and a second support plate 6 for supporting the mold shell flask 7 is provided in the lower part of the tank body. During pouring, the mold shell flask 7 is transferred to the second support plate 6, and the ladle 8 filled with pouring liquid is hung on the pouring mechanism, and the guide groove 5 is aligned with the pouring port 701 of the mold shell flask 7. Then, the sealed tank cover of the vacuum pouring tank is closed, vacuuming is performed, the pouring mechanism tilts the ladle for pouring, pressurization is performed after pouring is completed, and finally the pressure is released and the mold shell flask is taken out. In the above-mentioned pouring process, the pressurization process mainly plays the role of improving the fluidity of the pouring liquid, promoting the molding of thin-walled complex castings, and improving the quality and density of the castings. Under ideal conditions, after the pouring is completed, when pressurizing, the pressurized air flow 9 should only pressurize the pouring liquid through the pouring port 701 and the riser 702 of the mold shell sand box to achieve the above-mentioned pressurization effect. However, in actual operation, since the gypsum mold 703 in the mold shell sand box 7 will always have some cracks after being baked, there is also a gap between the gypsum mold 703 and the mold shell sand box wall, and the mold shell sand box 7 and the second support plate 6 are not completely sealed, so the flow of the pressurized air flow 9 is as follows. Figure 1 As indicated by the middle arrow, air will flow back into the mold through the contact surface between the mold shell flask 7 and the second support plate 6, causing air to be pumped into the liquid mold 704 to form bubbles, resulting in choking, reducing the quality of the casting, and even causing defects such as incomplete casting. Utility Model Content

[0003] The purpose of the utility model is to provide a vacuum pouring pot for plaster casting, so as to solve the technical problem that during vacuum pouring in the prior art, the pressurization process backflows into the casting mold, so that air is pumped into the liquid casting mold to form bubbles, causing choking, reducing the quality of the casting, and even causing incomplete casting defects.

[0004] To achieve the above-mentioned purpose, the technical solution of the vacuum pouring pot for gypsum casting provided by the present invention is as follows:

[0005] A vacuum pouring tank for gypsum mold casting comprises a tank body, wherein a sealing partition is fixedly provided in the tank body for dividing the tank body cavity into an upper sealed tank and a lower sealed tank; the upper and lower sealed tanks are respectively provided with a vacuum pipe and a pressure relief pipe, and the upper sealed tank is provided with a pressurizing pipe; the upper sealed tank is provided with a pouring mechanism and a guide groove; a jacking device is provided in the lower sealed tank, and a first support plate for supporting a mold shell sand box is fixedly connected to the jacking mechanism of the jacking device; a pouring hole is provided on the sealing partition that passes through the upper and lower sealed tanks; the pouring hole corresponds to the outlet of the guide groove and the pouring port of the mold shell sand box.

[0006] Furthermore, the pouring hole is a truncated cone hole that is smaller at the top and larger at the bottom.

[0007] Furthermore, the surface area of ​​the first support plate is larger than the bottom area of ​​the mold shell flask, and the first support plate completely supports the mold shell flask.

[0008] Furthermore, the jacking device is a jacking cylinder.

[0009] The vacuum pouring tank for plaster casting of the present invention has the following beneficial effects: This invention is a pioneering invention. By providing a sealing partition within the vacuum pouring tank and a lifting mechanism that lifts the mold shell and flask to contact the sealing partition, during the pressurization process, pressurized gas can only be applied to the pouring port of the mold shell and flask, thereby improving the fluidity of the pouring liquid, promoting the molding of thin-walled complex castings, and improving the quality and density of the castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a vacuum pouring tank mechanism of the prior art;

[0011] Figure 2 The utility model relates to a vacuum pouring tank mechanism.

[0012] Description of reference numerals:

[0013] 1. Tank body; 101, upper sealed tank; 102, lower sealed tank; 2. Vacuum tube; 3. Pressure relief tube; 4. Pressurization tube; 5. Diversion trough; 6. Second support plate; 7. Mold shell and flask; 701, pouring gate; 702, riser; 703, gypsum mold; 704, casting mold; 8. Ladle; 9, pressurized gas; 10, sealing baffle; 11, lifting mechanism; 12, first support plate; 13, pouring hole; DETAILED DESCRIPTION

[0014] In order to solve the problems in the background technology, the core utility model concept of the present invention is: by arranging a sealing partition 10 in the vacuum pouring tank and a lifting mechanism 11 for lifting the mold shell sand box and making solid contact with the sealing partition, so that in the pressurization process, only the mold shell sand box pouring port 701 can apply pressure to the pressurized gas, thereby achieving the effect of improving the fluidity of the pouring liquid, promoting the molding of thin-walled complex castings, and at the same time improving the quality and density of the castings.

[0015] The present invention is further described in detail below with reference to the embodiments.

[0016] Specific embodiment 1 of the vacuum pouring pot for gypsum casting provided by the utility model:

[0017] Reference Figure 2 As shown, a vacuum pouring tank for gypsum mold casting includes a tank body 1, in which a sealing partition 10 is fixedly provided for dividing the inner cavity of the tank body into an upper sealed tank 101 and a lower sealed tank 102; the upper and lower sealed tanks are respectively provided with a vacuum pipe 2 and a pressure relief pipe 3, and the upper sealed tank 101 is provided with a pressurizing pipe 4; the upper sealed tank 101 is provided with a pouring mechanism and a guide groove 5; a jacking device 11 is provided in the lower sealed tank 102, and a first support plate 12 for supporting the mold shell sand box 7 is fixedly connected to the jacking mechanism of the jacking device 11; a pouring hole 13 passing through the upper and lower sealed tanks is provided on the sealing partition; the pouring hole 13 corresponds to the outlet of the guide groove 5 and the pouring port 701 of the mold shell sand box.

[0018] As a specific embodiment, the pouring hole 13 is a frustum hole that is smaller at the top and larger at the bottom. In other embodiments, the pouring hole 13 can also be a straight hole or other through hole that allows the pouring liquid to be smoothly poured into the pouring port 701 of the mold shell sand box.

[0019] As a specific implementation, the surface area of ​​the first support plate 12 is larger than the bottom area of ​​the mold shell flask 7, and the first support plate 12 completely supports the mold shell flask 7. This structure is mainly for.

[0020] As a specific embodiment, the jacking device 11 is a jacking cylinder. In other embodiments, the jacking device can also be an electrically, mechanically or pneumatically driven device.

[0021] As a specific embodiment, a plaster casting process uses a vacuum casting pot for plaster casting as shown above during the pouring process.

[0022] As a specific embodiment, the pouring process includes the following steps:

[0023] Step 1: transfer the mold shell sand box to the first support plate in the lower sealing tank, and align the pouring port of the mold shell sand box with the pouring hole;

[0024] Step 2: Hang the ladle filled with the pouring liquid on the pouring mechanism of the upper sealing tank;

[0025] Step 3: Close the sealed tank cover of the vacuum pouring tank, and simultaneously evacuate the tank cavity, the ladle, and the shell sand box through the vacuum pipes of the upper and lower sealed tanks;

[0026] Step 4: After reaching the preset vacuum degree, the mold shell sand box and the sealing partition are pressed together by the lifting device;

[0027] Step 5: Close the vacuum valves on the vacuum pipes of the upper and lower sealing tanks, tilt the ladle through the pouring mechanism, and the pouring liquid flows into the pouring hole through the guide groove and enters the pouring gate for pouring;

[0028] Step 6: When the pouring liquid is about to overflow the pouring port, stop pouring, open the pressure valve on the pressure pipe, and allow the pressurized air flow to enter the tank body and maintain the pressure for a period of time;

[0029] Step 7: After the pressure holding time is over, close the pressure valve and open the pressure relief valves on the pressure relief pipes of the upper and lower sealed tanks to release the pressure;

[0030] Step 8. After the pressure relief is completed, open the sealed tank cover of the vacuum pouring tank, transfer the cast shell sand box out, let it stand and cool naturally.

[0031] As a specific embodiment, in step 1, after the mold shell flask is transferred to the first support plate in the lower sealed tank, an external chiller or chilled iron sand is placed all or partly around the mold shell flask on the first support plate. As a preferred embodiment, chilled iron sand is placed all around the mold shell flask on the first support plate.

[0032] As a specific embodiment, the gypsum mold casting process of the utility model includes the following steps:

[0033] Step 1: Prepare the wax model. According to the equipment drawings and production process requirements, the wax model is usually printed using 3D printing equipment, and whether to perform parting is determined based on the process.

[0034] Step 2: Arrange the pouring system; evenly arrange vertical runners on the surface of the wax mold. The vertical runners are generally coaxial with the corresponding pouring gates or risers, and whether to set internal chillers is determined in the thick parts of the wax mold as needed;

[0035] Step 3: Prepare a plaster mold. Place the wax mold and pouring system prepared in step 2 upside down in a sand box, then pour the gypsum slurry. Finally, the gypsum slurry solidifies to form a plaster mold. As a preferred solution, in actual operation, vacuum grouting equipment is generally used to perform negative pressure grouting to obtain a relatively stable plaster mold structure.

[0036] Step 4: Shell firing: The flask obtained in step 3 is sent to a firing furnace, and dewaxed by firing to obtain a gypsum shell flask;

[0037] Step five, pouring and molding; transfer the shell sand box obtained in step four to the first support plate in the lower sealed tank of the vacuum pouring tank, and align the pouring port of the shell sand box with the pouring hole; hang the ladle filled with pouring liquid on the pouring mechanism of the upper sealed tank, and place cold iron sand all around the shell sand box on the first support plate; close the sealed tank cover of the vacuum pouring tank, and evacuate the tank body, ladle and shell sand box at the same time through the vacuum pipes of the upper and lower sealed tanks; after reaching the preset vacuum degree, use the jacking device to push the shell sand box and the sealing partition to the top; close Close the vacuum valves on the vacuum pipes of the upper and lower sealed tanks, tilt the ladle through the pouring mechanism, and the pouring liquid flows into the pouring hole through the guide groove and enters the pouring port for pouring; when the pouring liquid is about to overflow the pouring port, stop pouring, open the pressure valve on the pressure pipe, and pressurized air flows into the tank body, and maintains the pressure for a period of time; after the pressure holding time is over, close the pressure valve, and open the pressure relief valves on the pressure relief pipes of the upper and lower sealed tanks respectively to release the pressure; after the pressure relief is completed, open the sealed tank cover of the vacuum pouring tank, transfer the cast shell sand box out, let it stand and cool naturally;

[0038] Step six, cleaning the sand box; dismantle the shell sand box in step five and clean the riser, then clean the gypsum shell to obtain the finished casting.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A vacuum pouring pot for plaster casting, characterized in that: The tank body comprises a tank body, wherein a sealing partition is fixedly provided in the tank body for dividing the tank body cavity into an upper sealed tank and a lower sealed tank; The upper and lower sealed tanks are respectively provided with a vacuum pipe and a pressure relief pipe, and the upper sealed tank is provided with a pressurizing pipe; The upper sealing tank is provided with a pouring mechanism and a guide groove; A jacking device is provided in the lower sealed tank, and a first supporting plate for supporting the mold shell sand box is fixedly connected to the jacking mechanism of the jacking device; The sealing partition is provided with a pouring hole which passes through the upper and lower sealing tanks; the pouring hole corresponds to the outlet of the guide groove and the pouring port of the shell sand box.

2. The vacuum pouring pot for plaster casting according to claim 1, characterized in that: The pouring hole is a frustum hole that is smaller at the top and larger at the bottom.

3. The vacuum pouring pot for plaster casting according to claim 2, characterized in that: The surface area of ​​the first support plate is larger than the bottom area of ​​the mold shell flask, and the first support plate completely supports the mold shell flask.

4. The vacuum pouring pot for plaster casting according to claim 2 or 3, characterized in that: The jacking device is a jacking cylinder.

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