CN108380825B - Rapid forming method for microwave-cured water-soluble salt core - Google Patents
Rapid forming method for microwave-cured water-soluble salt core Download PDFInfo
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- CN108380825B CN108380825B CN201810409152.5A CN201810409152A CN108380825B CN 108380825 B CN108380825 B CN 108380825B CN 201810409152 A CN201810409152 A CN 201810409152A CN 108380825 B CN108380825 B CN 108380825B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention discloses a rapid forming method of a microwave-cured water-soluble salt core, and belongs to the technical field of casting. The method comprises the steps of S100, pretreatment of inorganic salt; s200, preparing an injection liquid; s300, droplet jetting and forming; s400, intermittent microwave curing; s500, soaking or spraying an inorganic salt solution; s600, secondary intermittent microwave curing; and S700, sintering. According to the invention, after the salt core is subjected to microwave hardening and preforming, the salt core is subjected to inorganic salt solution infiltration, secondary microwave curing and sintering, and as the inorganic salt solution has extremely strong wettability, the pores of the preformed salt core can be fully wetted and filled, and the inorganic salt is crystallized and separated out in the secondary microwave curing process, so that the strength of the salt core is obviously improved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a rapid forming method of a microwave-cured water-soluble salt core.
Background
The water-soluble core has wide application in the production of castings with complex inner cavities and curved channels due to the excellent water-soluble collapsibility and environment-friendly characteristic. In the field of the foundry industry, water-soluble cores made with soluble salts as the main material are called water-soluble salt cores.
At present, the production of the water-soluble salt core mainly adopts a compression sintering method, a melt casting method and other forming methods. The pressing and sintering method is mainly characterized in that raw materials for preparing the salt core are mixed, pressed and formed in a salt core die, and then baked and sintered at a certain temperature. Such as: chinese patent CN200810018179.8, metal salt, binder, fiber and whisker are mixed uniformly in proportion and then put into a die to be pressed into salt core blank, then the salt core blank is put into a furnace to be roasted, and is cooled and taken out of the furnace to be machined according to the specific size of the salt core to obtain the required salt core; chinese patent CN201010218306.6 firstly dries metal halide and reinforcing agent, then uniformly mixes the dried halide, reinforcing agent and binder to be mutually contained, then makes the mixed material into a salt core blank, and finally puts the blank into a sintering furnace for sintering to obtain a salt core; chinese patent CN200610125398.7 firstly crushes water-soluble metal salt and auxiliary materials to a specified particle size, then mixes them in proportion, weighs out a certain weight, puts them into a powder pressing mold to press salt core pressing blanks, then puts the salt core pressing blanks into a furnace to bake, and then processes positioning holes for core setting. However, these salt cores, which are simply pressed, have low initial strength and are prone to cracking or scratching during handling. Some researchers have added water in a proper amount to improve the bonding strength, which causes the problems of difficult demoulding of the salt core and the like. The melting casting method is to melt inorganic salt, cast the inorganic salt into a salt core mould, cool and solidify the molten salt and then demould the molten salt to obtain the required salt core. Such as: chinese patent CN201611186722.6 uses water-soluble inorganic salt (low melting point potassium nitrate and sodium nitrate, high melting point potassium chloride, sodium chloride, potassium bromide, sodium bromide, 70-100%) and reinforcement (alumina powder, high alumina bauxite, kaolin, quartz powder, glass fiber powder, refractory clay powder, bentonite, Dalin sand, 200-1250 mesh, 0-30%) as raw materials. During preparation, salt is mixed, melted and poured into a metal mold to obtain a composite salt core suitable for casting low-melting-point alloy; chinese patent CN200710052535.3 mixes metal halide and ceramic whisker, melts, pours and forms to obtain a water-soluble salt core suitable for high-pressure casting. However, the molten inorganic salt has a low viscosity, is easily flowed out from the gap of the metal mold, and has disadvantages of high corrosivity of the molten salt, high energy consumption for high-temperature melting, and the like.
In fact, the salt core can be formed without leaving a forming die in both the press sintering method and the melt casting method. The cost of the traditional method for preparing the personalized water-soluble salt core product is extremely high, and the development period of the novel water-soluble salt core product is longer. In recent years, rapid prototyping techniques have found widespread use in sand molds/cores. Chinese patent CN201010222794.8 discloses a method for rapidly forming and manufacturing a ceramic core, which comprises the steps of uniformly mixing a low-temperature reinforcer and ceramic powder, then carrying out SLS rapid forming, pretreating the obtained ceramic core green body, removing the low-temperature reinforcer in the ceramic core green body, impregnating a high-temperature adhesive, and pre-burning and degreasing; and finally, sintering at high temperature to obtain the final integral ceramic core product. However, SLS forming equipment is expensive and is not suitable for rapid forming with water soluble salt cores. Chinese patent CN201410267868.8 discloses a system and method for droplet spray forming water soluble cores, which can be used for rapid forming of water soluble sand cores. The liquid sprayed by the method is an inorganic salt solution, and the liquid is easy to corrode the droplet spraying nozzle due to certain corrosiveness, so that the droplet spraying nozzle with an anti-corrosion effect needs to be adopted, and the cost of forming equipment is increased.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems that the traditional forming method of the existing water-soluble salt core is long in preparation period and high in production cost of personalized products, and the existing micro-droplet spray forming water-soluble salt core takes inorganic salt solution as spray liquid, so that a spray head is easy to corrode, the service life is short, and the strength of the salt core is low. The method for quickly forming the microwave-cured water-soluble salt core can shorten the manufacturing period of the water-soluble salt core and prolong the service life of a micro-droplet jetting nozzle.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a rapid forming method of a microwave-cured water-soluble salt core, which is characterized by comprising the following steps of:
s100, pretreating inorganic salt, namely drying one or more water-soluble inorganic salts, grinding, mixing and screening to obtain 100-mesh 200-mesh salt powder for later use;
s200, preparing a spray liquid, and uniformly mixing water and an additive, wherein the additive comprises a water-soluble high polymer material; preparing into aqueous solution with viscosity of 1-10 cps;
s300, carrying out droplet injection forming, namely paving the ground and screened inorganic salt powder on a lifting workbench, injecting the aqueous solution configured in the S200 by a droplet injection nozzle according to a dropping liquid path generated by a salt core solid model, and after the droplet injection of the layer is finished, descending the lifting workbench by 0.01-1 mm to sequentially finish the subsequent dropping liquid procedures of the discrete layer until the dropping liquid procedures of all the discrete layers are finished;
s400, intermittent microwave curing, namely taking out the salt core which is subjected to spray forming together with the powder bed, placing the salt core in a microwave oven for intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, infiltrating an inorganic salt solution, taking out the salt core after microwave curing, and infiltrating the inorganic salt solution for no more than 5 min; the inorganic salt solution is saturated inorganic salt solution at normal temperature;
s600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven for secondary intermittent microwave heating and curing, and taking out after the moisture in the salt core is fully dissipated;
s700, sintering, namely placing the salt core obtained by secondary microwave curing in a sintering furnace for sintering, wherein the sintering temperature is 400-1000 ℃, and the sintering time is 1-4 h.
Preferably, the water-soluble inorganic salt in step S100 includes chloride, bromide, carbonate, sulfate, phosphate, nitrate, meta-aluminate.
Preferably, the additive in step S200 includes a water-soluble polymer material and a surfactant, wherein the water-soluble polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin and polyacrylamide; the surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, fatty alcohol ester, glyceryl monostearate, sorbitan fatty acid and polysorbate.
Preferably, the inorganic salt solution in step S500 is a saturated inorganic salt solution at normal temperature.
Preferably, the sintering temperature in step S700 is T, and T is 590 to 690 ℃.
Preferably, the amount of the surfactant is 0.10-0.15% of the amount of the water-soluble polymer material.
Preferably, the cations of the plurality of water-soluble inorganic salts in the additive are the same.
Preferably, the inorganic salt solution in step S500 is the same as the inorganic salt solution in step S100.
Preferably, the method is carried out by adopting a device which comprises a salt core spraying unit, a salt core curing unit, a salt core infiltrating unit and a salt core sintering unit, wherein the salt core spraying unit comprises a liquid preparation bin, a liquid spraying device and a material paving device, the liquid preparation bin is used for storing prepared spraying liquid, the material paving device is used for paving inorganic salt powder, and the liquid spraying device is used for spraying the spraying liquid to the paved salt cores so as to enable the salt cores to be aggregated and condensed into salt cores to be cured; the salt core curing unit is used for carrying out microwave heating curing on the salt core to be cured to form a cured salt core; the salt core infiltration unit is used for infiltrating the solidified salt core; the salt core sintering unit is used for sintering the salt core to be sintered.
Preferably, salt core spraying unit still includes compounding device, material receiving platform, elevating platform and controller, material receiving platform level sets up in elevating platform's top, and material receiving platform reciprocates along with elevating platform's lift, the controller is used for controlling hydrojet device's injection parameter, hydrojet device passes through the transfer line and connects the liquid distribution storehouse, hydrojet device slides and sets up on moving guide, and this moving guide level sets up in the top of material receiving platform, and hydrojet device horizontal slip is received the platform below at moving guide and is sprayed the injection liquid, be provided with the stone device between material receiving platform and the moving guide, this stone device is used for laying inorganic salt powder to material receiving platform.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which comprises the following steps: s100, pretreating inorganic salt; s200, preparing an injection liquid; s300, droplet jetting and forming; s400, intermittent microwave curing; s500, soaking or spraying an inorganic salt solution; s600, secondary intermittent microwave curing; s700, sintering, namely performing microwave hardening preforming on the salt core, and then performing inorganic salt solution infiltration, secondary microwave curing and sintering on the salt core, wherein the inorganic salt solution has extremely strong wettability, can fully wet and fill the pores of the preformed salt core, and is crystallized and separated out in the secondary microwave curing process, so that the strength of the salt core is obviously improved;
(2) according to the rapid forming method of the microwave-cured water-soluble salt core, the superfine soluble salt particles are subjected to powder bed tiling, and the water solution of the neutral water-soluble high polymer material is sprayed out of the droplet spraying nozzle, so that on one hand, the adoption of acidic or alkaline solution in the droplet spraying nozzle is avoided, and the problem of short service life of the droplet spraying nozzle is solved; on the other hand, the salt core can be completely washed by water after use, and the water solution can easily flow out of a complex inner cavity and a bent pore passage, and particularly easily flows out of a nearly closed inner cavity;
(3) the invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which carries out integral microwave heating on a powder bed which finishes a printing task, wherein a part sprayed with micro-droplets is cured after being heated, and a part not sprayed with the micro-droplets can protect the part sprayed with the micro-droplets, so that the salt core is prevented from being scratched in the conveying process, and the salt core is still kept in a loose state after being heated by microwaves. In the traditional heating and curing core making process, the heat transfer characteristic is that heat is transferred from outside to inside, so that the curing speed of the outer layer of the salt core is high, the water loss of the inner layer is difficult, and the strength of the salt core is low. The microwave curing adopted by the invention can realize simultaneous heating inside and outside, and the intermittent microwave heating mode is beneficial to the full dissipation of the moisture in the inner layer, thereby ensuring the strength of the salt core;
(4) the invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which adopts a device comprising a salt core spraying unit, a salt core curing unit, a salt core soaking unit and a salt core sintering unit, realizes the die-free rapid manufacturing of the salt core by a liquid spraying device and a material spreading device, realizes the simultaneous heating inside and outside the salt core curing unit by adopting microwave heating, and ensures the strength of the salt core by facilitating the sufficient dissipation of the moisture in the inner layer in an intermittent microwave heating mode.
Drawings
FIG. 1 is a schematic diagram of an apparatus for rapid formation of a microwave-cured water-soluble salt core according to the present invention;
FIG. 2 is a flow chart of a method of rapid formation of a microwave-cured water-soluble salt core of the present invention.
The reference numerals in the schematic drawings illustrate:
100. a salt core spraying unit; 110. a mixing device; 111. a discharge port; 120. a liquid preparation bin; 121. a transfusion tube; 122. a liquid spraying device; 131. a moving guide rail; 132. fixing the guide rail; 141. a receiving platform; 142. a material spreading device; 151. a shaped discrete layer; 161. a working chamber; 162. a piston; 163. lifting the working table; 164. a powder bed; 170. a controller; 171. a data interface;
200. a salt core curing unit; 210. a microwave oven; 220. a support; 230. curing the salt core;
300. a salt core infiltration unit; 310. an inorganic salt solution tank; 320. solidifying the salt core;
400. a salt core sintering unit; 410. sintering furnace; 420. and (5) sintering the salt core.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
The rapid forming method for the microwave-cured water-soluble salt core comprises the following steps:
s100, pretreating inorganic salt, namely drying one or more water-soluble inorganic salts, grinding, mixing and screening to obtain 100-mesh 200-mesh salt powder for later use;
s200, preparing a spray liquid, and uniformly mixing water and an additive to prepare an aqueous solution with the viscosity of 1-10 cps;
s300, droplet injection forming, namely spreading the ground and screened inorganic salt powder on a lifting workbench 163, injecting the aqueous solution configured in the S200 by a droplet injection nozzle according to a dropping path generated by a salt core solid model, and after the droplet injection of the layer is finished, descending the lifting workbench by 0.01-1 mm to sequentially finish the subsequent dropping process of the discrete layer until the dropping process of all the discrete layers is finished;
s400, intermittent microwave curing, namely taking out the salt core 164 which is subjected to spray forming together with the powder bed, placing the salt core in a microwave oven for intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, infiltrating or spraying an inorganic salt solution, taking out the salt core after microwave curing, and infiltrating or spraying the inorganic salt solution for no more than 5 min;
s600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven 210 for secondary intermittent microwave heating curing, and taking out the salt core after the moisture in the salt core is fully dissipated;
s700, sintering, namely placing the salt core obtained by secondary microwave curing in a sintering furnace 410 for sintering, wherein the sintering temperature is 400-1000 ℃, and the sintering time is 1-4 h.
The additive of the step S200 comprises a water-soluble high polymer material and a surfactant, wherein the water-soluble high polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide and the like; the surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, fatty alcohol ester, glyceryl monostearate, sorbitan fatty acid, polysorbate and the like, and the weight of the surfactant is 0.10-0.15% of that of the water-soluble high polymer material.
The inorganic salt solution in the step S500 is a saturated inorganic salt solution at normal temperature; the inorganic salt used in the saturated solution of the inorganic salt in the step S500 is the same as the inorganic salt described in the step S100; the sintering temperature in step S600 is T, and T is 590 to 690 ℃.
The spraying liquid is formed by mixing water and additives, and the water-soluble high polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide and the like. The surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, fatty alcohol ester, glyceryl monostearate, sorbitan fatty acid, polysorbate, etc. Wherein the surfactant is 0.10-0.15% of the water-soluble polymer material. The water-soluble polymer material provides initial bonding strength for the water-soluble salt core, and the water-soluble polymer material is decomposed at high temperature under high-temperature sintering, so that the gas evolution of the salt core can be reduced, and the strength of the salt core is improved. The addition of the surfactant is beneficial to improving the wetting effect of the spraying liquid on the surface of the salt particles. As the additive and water are mixed into a solution, in the subsequent heating process, the water is gradually evaporated, and the components such as inorganic salt, water-soluble polymer and the like are gradually attached to the surface of the particles to be crystallized and separated out to form bonding bridges due to the reduction of the solubility, so that a certain initial strength is obtained. The water-soluble high polymer material plays a role in improving the initial strength, if the initial strength is too low, the improvement of the initial strength is not obvious enough, and if the initial strength is too high, the solution has high viscosity and is difficult to spray out of a spray head, and the solution is not completely decomposed in the subsequent high-temperature heating process, so that the gas evolution of the salt core is too high.
The method of the embodiment is carried out by adopting a device, the device comprises a salt core spraying unit 100, a salt core curing unit 200, a salt core soaking unit 300 and a salt core sintering unit 400, the salt core spraying unit 100 comprises a liquid distribution bin 120, a liquid spraying device 122 and a material spreading device 142, the liquid distribution bin 120 is used for storing prepared spraying liquid, the material spreading device 142 is used for laying salt cores, and the liquid spraying device 122 is used for spraying the spraying liquid to the laid salt cores so that the salt cores are gathered and condensed into salt cores 230 to be cured; the salt core curing unit 200 is used for performing microwave heating curing on the salt core 230 to be cured to form a cured salt core 320, and the salt core 230 to be cured is placed on the bracket 220; the salt core infiltration unit 300 is used for infiltrating the solidified salt core 320; the salt core sintering unit 400 is used for sintering the salt core 420 to be sintered.
The salt core spraying unit 100 of the embodiment further comprises a mixing device 110, a material receiving platform 141, a lifting workbench 163 and a controller 170, wherein the mixing device 110 is used for mixing the salt core, the material receiving platform 141 is horizontally arranged above the lifting workbench 163, the material receiving platform 141 moves up and down along with the lifting workbench 163, a powder bed 164 is arranged on the surface of the lifting workbench 163, a working cavity 161 and a piston 162 are arranged at the lower end of the lifting workbench 163, and the piston 162 pushes the lifting workbench 163 to move up and down in the working cavity 161.
The controller 170 is used for controlling the ejection parameters of the liquid ejecting apparatus 122, and the controller 170 is provided with a data interface 171 for transmitting data. The liquid spraying device 122 is connected with the liquid distribution bin 120 through a liquid conveying pipe 121, the liquid spraying device 122 is arranged on a moving guide rail 131 in a sliding mode, the moving guide rail 131 is horizontally arranged above the material receiving platform 141, the liquid spraying device 122 horizontally slides on the moving guide rail 131 to spray spraying liquid to the material receiving platform 141, the moving guide rail 131 is connected with a fixed guide rail 132, and the fixed guide rail 132 and the moving guide rail 131 are vertically arranged on the same horizontal plane. The discharge port 111 of the mixing device 110 is connected with a spreading device 142, the spreading device 142 is arranged between the receiving platform 141 and the movable guide rail 131, and the spreading device 142 is used for spreading inorganic salt powder to the receiving platform 141.
The working process of the salt core spraying unit 100 is as follows: firstly, the prepared spraying liquid is put into the liquid preparation bin 120, inorganic salt powder is added into the mixing device 110, the inorganic salt powder falls onto the material receiving platform 141 through the material outlet 111, the inorganic salt powder is flatly paved on the powder bed 164 placed on the lifting working platform 163 through the paving device 142, and one layer of material is paved on the formed discrete layer 151 after the paving device 142 moves back and forth. The liquid distribution bin 120 is connected with a liquid spraying device 122 through a liquid conveying pipe 121, the liquid spraying device 122 is mounted on a movable guide rail 131, the liquid spraying device 122 is controlled by a controller 170 to slide along the movable guide rail 131, the movable guide rail 131 is also controlled by the controller 170 to slide along a fixed guide rail 132, a data interface 171 of the controller 170 is connected with an upper computer, and the controller 170 downloads a running track file of a discrete layer dropping device obtained by layering and dispersing a CAD geometric solid model of a sand core generated by the upper computer so as to control the liquid spraying device 122 to move in the horizontal direction. The working chamber 161 is disposed below the liquid spraying device 122, a lifting table 163 is disposed in the working chamber 161, the lifting table 163 is connected to a piston 162 driven by a motor, and the piston 162 drives the lifting table 163 to move up and down in a vertical direction.
The salt core curing unit 200 of the present embodiment includes a microwave oven 210, and the microwave oven 210 is configured to perform intermittent microwave heating on the salt core 230 to be cured, so that the salt core 230 to be cured becomes a cured salt core 320 after being completely cured.
The salt core infiltration unit 300 of the embodiment includes an inorganic salt solution tank 310, an inorganic salt solution having the same composition as that of the inorganic salt in the spray liquid is contained in the inorganic salt solution tank 310, and the inorganic salt solution tank 310 is used for infiltrating the solidified salt core 320, wherein the infiltration time t1 and t1 are less than 5 min.
The salt core sintering unit 400 of the present embodiment includes a sintering furnace 410, and the sintering furnace 410 is used for sintering the salt core 420 to be sintered, where the sintering temperature is T, T is 400-.
Example 2
The invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which comprises the following forming processes:
s100, pretreating inorganic salt, drying potassium carbonate at 180 ℃ under 160-;
s200, preparing a spraying liquid, dissolving polyethylene glycol and starch into water, and preparing a solution with the viscosity of 3-5 cps;
s300, droplet spraying and forming of the water-soluble salt core. Spreading the ground and sieved potassium carbonate powder on a lifting workbench 163, spraying the aqueous solution configured by S200 by a droplet spraying nozzle according to a droplet path generated by a salt core solid model, and after the droplet spraying of the layer is finished, descending the lifting workbench 163 by 0.02mm to sequentially finish the subsequent droplet processes of the discrete layers until the droplet processes of all the discrete layers are finished;
s400, intermittent microwave curing. Taking out the salt core after the spray forming and the powder bed 164, putting the salt core and the powder bed in a microwave oven 210 for integral intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, soaking an inorganic salt solution, and soaking a potassium carbonate saturated solution in the salt core after microwave curing for 10-15S.
S600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven 210 for secondary intermittent microwave heating, and taking out the salt core after the water in the solution in the salt core is completely lost.
Example 3
The invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which comprises the following forming processes:
s100, pretreatment of inorganic salt. Drying potassium carbonate and potassium chloride at the temperature of 160-180 ℃ and 100-105 ℃ respectively, and then performing ball milling and screening on the dried potassium carbonate and the potassium chloride respectively on a ball mill to obtain two salt powders of 140-200 meshes for later use;
s200, preparing a spraying liquid, dissolving polyacrylamide, polyethylene glycol, sorbitan fatty acid and polysorbate in water to prepare a solution with the viscosity of 3-5 cps;
s300, droplet injection forming of the water-soluble salt core, uniformly mixing ground and screened potassium carbonate powder and potassium chloride powder according to the mass ratio of 6:4, then flatly paving the mixture on a lifting workbench 163, injecting the aqueous solution configured in the S200 by a droplet injection nozzle according to a dropping path generated by a salt core solid model, and sequentially completing subsequent dropping procedures of discrete layers when the droplet injection of the layer is completed, wherein the lifting workbench 163 descends by 0.03mm until the dropping procedures of all the discrete layers are completed;
s400, intermittent microwave curing, namely taking out the salt core subjected to spray forming together with the powder bed 164, putting the salt core into a microwave oven 210 for integral intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, soaking in inorganic salt solution, taking out the salt core after microwave curing, and soaking in K+//Cl-、CO32-—H2Solution of O system at room temperature, leachingThe moistening time is 10-20 s;
s600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven 210 for secondary intermittent microwave heating, and taking out the salt core after the water in the solution in the salt core is completely lost;
s700, placing the salt core obtained by the secondary microwave curing in a sintering furnace 410 for sintering, wherein the sintering temperature is 750-800 ℃, and the sintering time is 1-2 h.
Example 4
The invention relates to a rapid forming method of a microwave-cured water-soluble salt core, which comprises the following forming processes:
s100, pretreating inorganic salt, namely drying sodium carbonate and sodium chloride at the temperature of 200-;
s200, preparing a spraying liquid, dissolving polyacrylamide, polyethylene glycol and fatty alcohol ester into water, and preparing a solution with the viscosity of 3-5 cps;
s300, droplet injection forming of the water-soluble salt core, uniformly mixing ground and screened potassium carbonate powder and potassium chloride powder according to the mass ratio of 7:3, then flatly paving the mixture on a lifting workbench 163, injecting the aqueous solution configured in the S200 by a droplet injection nozzle according to a dropping path generated by a salt core solid model, and sequentially completing subsequent dropping procedures of discrete layers when the droplet injection of the layer is completed, wherein the lifting workbench 163 descends by 0.03mm until the dropping procedures of all the discrete layers are completed;
s400, intermittent microwave curing, namely taking out the salt core subjected to spray forming together with the powder bed 164, putting the salt core into a microwave oven 210 for integral intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, soaking in inorganic salt solution, taking out the salt core after microwave curing, and soaking in Na+//Cl-、CO32-—H2The O system is a solution at normal temperature, and the soaking time is 10-20 s;
s600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven 210 for secondary intermittent microwave heating, and taking out the salt core after the water in the solution in the salt core is completely lost;
s700, placing the salt core obtained by the secondary microwave curing in a sintering furnace 410 for sintering, wherein the sintering temperature is 750-800 ℃, and the sintering time is 1-2 h.
The above-mentioned embodiments only express a certain implementation mode of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention; therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A rapid forming method of a microwave-cured water-soluble salt core is characterized by comprising the following steps:
s100, pretreating inorganic salt, namely drying one or more water-soluble inorganic salts, grinding, mixing and screening to obtain 100-mesh 200-mesh salt powder for later use;
s200, preparing a spray liquid, and uniformly mixing water and an additive, wherein the additive comprises a water-soluble high polymer material; preparing into aqueous solution with viscosity of 1-10 cps;
s300, carrying out droplet injection forming, namely paving the ground and screened inorganic salt powder on a lifting workbench (163), injecting the aqueous solution configured in the S200 by a droplet injection nozzle according to a dropping path generated by a salt core solid model, and after the droplet injection of the layer is finished, descending the lifting workbench (163) by 0.01-1 mm to sequentially finish the subsequent dropping process of the discrete layer until the dropping process of all the discrete layers is finished;
s400, intermittent microwave curing, namely taking out the salt core subjected to spray forming together with the powder bed (164), placing the salt core in a microwave oven (210) for intermittent microwave heating, and taking out the salt core after the salt core is completely cured;
s500, infiltrating an inorganic salt solution, taking out the salt core after microwave curing, and infiltrating the inorganic salt solution for no more than 5 min; the inorganic salt solution is saturated inorganic salt solution at normal temperature;
s600, secondary intermittent microwave curing, namely placing the soaked salt core in a microwave oven (210) for secondary intermittent microwave heating curing, and taking out the salt core after the moisture in the salt core is fully dissipated;
s700, sintering, namely placing the salt core obtained by secondary microwave curing in a sintering furnace (410) for sintering, wherein the sintering temperature is 400-1000 ℃, and the sintering time is 1-4 h.
2. The method of claim 1, wherein the water-soluble inorganic salt in step S100 comprises chloride, bromide, carbonate, sulfate, phosphate, nitrate, or meta-aluminate.
3. The method for rapidly forming a microwave-cured water-soluble salt core according to claim 1, wherein the additive of step S200 comprises a water-soluble polymer material and a surfactant, wherein the water-soluble polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin and polyacrylamide; the surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, fatty alcohol ester, glyceryl monostearate, sorbitan fatty acid and polysorbate.
4. The method of claim 1, wherein the rapid prototyping of a microwave-curable water-soluble salt core comprises: the sintering temperature in step S700 is T, and T is 590 to 690 ℃.
5. A method of rapid prototyping of a microwave-curable water-soluble salt core as set forth in claim 3 wherein: the amount of the surfactant is 0.10-0.15% of the amount of the water-soluble polymer material.
6. The method for rapid formation of a microwave-cured water-soluble salt core of claim 5, wherein: the inorganic salt solution in the step S500 is the same as the inorganic salt solution in the step S100.
7. A method for rapid formation of a microwave-cured water-soluble salt core according to any one of claims 1 to 6, wherein: the method is carried out by adopting a device, the device comprises a salt core spraying unit (100), a salt core curing unit (200), a salt core soaking unit (300) and a salt core sintering unit (400), the salt core spraying unit (100) comprises a liquid preparation bin (120), a liquid spraying device (122) and a material paving device (142), the liquid preparation bin (120) is used for storing prepared spraying liquid, the material paving device (142) is used for paving inorganic salt powder, and the liquid spraying device (122) is used for spraying the spraying liquid to the paved salt core to enable the salt core to be aggregated and condensed into a salt core (230) to be cured; the salt core curing unit (200) is used for performing microwave heating curing on the salt core (230) to be cured to form a cured salt core (320); the salt core infiltration unit (300) is used for infiltrating the solidified salt core (320); the salt core sintering unit (400) is used for sintering the salt core (420) to be sintered.
8. The method of claim 7, wherein the rapid prototyping of a microwave-curable water-soluble salt core comprises: the salt core spraying unit (100) further comprises a mixing device (110), a material receiving table (141), a lifting workbench (163) and a controller (170), the material receiving table (141) is horizontally arranged above the lifting workbench (163), the material receiving table (141) moves up and down along with the lifting workbench (163), the controller (170) is used for controlling spraying parameters of a liquid spraying device (122), the liquid spraying device (122) is connected with a liquid distribution bin (120) through a liquid conveying pipe (121), the liquid spraying device (122) is slidably arranged on a movable guide rail (131), the movable guide rail (131) is horizontally arranged above the material receiving table (141), the liquid spraying device (122) horizontally slides on the movable guide rail (131) to spray spraying liquid to the material receiving table (141), and a material spreading device (142) is arranged between the material receiving table (141) and the movable guide rail (131), the paving device (142) is used for paving inorganic salt powder to the material receiving platform (141).
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| CN111940694A (en) * | 2020-07-21 | 2020-11-17 | 中国第一汽车股份有限公司 | Method for manufacturing water-soluble salt core for high-pressure casting |
| CN114456781B (en) * | 2020-10-21 | 2023-05-26 | 中国石油化工股份有限公司 | Method for preparing solid dosage form from viscous salt-resistant fluid loss additive solution, solid dosage form fluid loss additive and application |
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| KR20020055054A (en) * | 2000-12-28 | 2002-07-08 | 이계안 | preparation method of high-pressure casting core and casting method of engine piston containing oil gallery |
| US20160121390A1 (en) * | 2013-05-29 | 2016-05-05 | Mitsubishi Heavy Industries, Ltd. | Precision-casting core, precision-casting core manufacturing method, and precision-casting mold |
| CN104001862B (en) * | 2014-06-16 | 2015-10-21 | 安徽工业大学 | A kind of rapid forming system of water-soluble core and manufacturing process |
| DE102014017091A1 (en) * | 2014-11-20 | 2016-05-25 | Mahle International Gmbh | Method for producing a cooling channel piston and cooling channel pistons produced by such a method |
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