CN108500216B - Rapid forming method of infrared pre-cured water-soluble mold core - Google Patents
Rapid forming method of infrared pre-cured water-soluble mold core Download PDFInfo
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Abstract
The invention discloses a rapid forming method of an infrared pre-cured water-soluble mold core, and belongs to the technical field of casting. The method comprises the steps of S100, preparing jet liquid; s200, droplet jetting forming and infrared heating pre-fixing; s300, soaking or spraying an inorganic salt solution; s400, intermittent microwave curing; and S500, sintering. According to the invention, after the core is subjected to microwave hardening and preforming, the core is subjected to inorganic salt solution infiltration, secondary microwave curing and sintering, the spray solution contains a high polymer material which is easy to absorb infrared rays, so that water is easy to dissipate in the infrared heating process, and the water-soluble core with higher initial strength is obtained.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a rapid forming method of an infrared pre-cured water-soluble mold core.
Background
A large number of aluminum alloy castings with complex inner cavities and curved ducts exist in the fields of automobiles, engineering machinery and aerospace. These complex aluminum alloy castings can be produced with built-in metal cores, resin sand cores, and water-soluble cores. The metal core manufacturing process is complex, and the adoption of chemical core removal easily causes environmental pollution, so that the organic resin sand core with excellent comprehensive performance is promoted to be applied to the production of the castings in a large quantity. However, with the development of the process technology, the forming temperature of the aluminum alloy casting is reduced, the collapsibility of the organic resin sand core which is easy to collapse originally is weakened, toxic and harmful gas can be generated in the casting process, and the problems of difficult sewage treatment, high energy consumption, serious sand grain breakage and the like exist in the regeneration of used sand. Therefore, the water-soluble core with high-efficiency water-soluble collapsibility and excellent environment-friendly characteristic has wide application prospect in the production of aluminum alloy castings with complex inner cavities and curved ducts.
At present, the production of the water-soluble mold core mainly adopts a pressing sintering method, a flow state pouring method and other forming methods. The pressing and sintering method is mainly characterized in that raw materials for preparing the core are mixed, then are pressed and formed in a core mould, and then are baked and sintered at a certain temperature.
Through retrieval, the invention has the name: a preparation method for preparing water soluble core mould of precision device (application number: 201611087546.0, application date: 2016.12.01), this application uses urea, sodium chloride, magnesium sulfate, corn kernel, saturated sodium chloride solution, polyvinyl alcohol, nanometer dioxide, carbon fiber, etc. as raw materials, get the core mould with strong bending resistance, high water solubility through pressing and secondary heating, can apply to the production of the copper pot handicraft; however, the method has the defects that the personalized water-soluble core product is extremely high in cost and long in production period, and the development period of the novel water-soluble core product is long.
In addition, the invention creates the name: a ceramic core rapid prototyping manufacturing approach (application number: 201010222794.8, application date: 2010.07.12), said method mixes low-temperature reinforcer and ceramic powder lot evenly and carries on SLS rapid prototyping, and then get ceramic core green compact preconditioning, then remove the low-temperature reinforcer in the ceramic core green compact, impregnate the high-temperature binder, presintering and degreasing; and finally, sintering at high temperature to obtain the final integral ceramic core product. However, this application has the disadvantage that SLS forming equipment is expensive and not suitable for rapid forming with water soluble cores.
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 mold core is long in preparation period and high in production cost of personalized products, and the existing micro-droplet liquid-spraying forming water-soluble mold core takes inorganic salt solution as spraying liquid, so that a spray head is easy to corrode, the service life is short, and the strength of the mold core is low. The method for quickly forming the infrared pre-cured water-soluble core can shorten the manufacturing period of the water-soluble core and prolong the service life of a micro-droplet liquid spraying 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 mold core, which comprises the following steps:
s100, preparing a spray liquid, uniformly mixing water and an additive to prepare an aqueous solution with the viscosity of 1-10cps and the pH value of 7;
s200, droplet liquid spraying forming and infrared heating pre-curing, wherein molding sand is flatly laid on a lifting workbench, a liquid spraying device sprays the aqueous solution prepared in the S100 according to a droplet liquid spraying path generated by a core solid model, after droplet liquid spraying of the layer is finished, an infrared heating plate is opened to carry out infrared heating curing on the layer, after curing, the lifting workbench descends by 0.01-1 mm, and the subsequent droplet liquid spraying process and the infrared heating pre-curing process of the discrete layer are sequentially finished until the liquid spraying and curing processes of all the discrete layers are finished;
s300, infiltrating an inorganic salt solution, taking out the mold core after the injection molding, and infiltrating the inorganic salt solution, wherein the infiltration time is t1, and t1 is less than 5 min;
s400, intermittent microwave curing, namely placing the soaked mold core in a microwave oven for intermittent microwave heating and curing, and taking out after the moisture in the mold core is fully dissipated;
s500, sintering, namely placing the core obtained by microwave curing in a sintering furnace for sintering, wherein the sintering temperature is T, T is 400-1000 ℃, the sintering time is T2, and T2 is 1-4 h.
Preferably, the additive of step S100 comprises the following components: 10-20 wt% of water-soluble polymer material, 0-5 wt% of organic acid and 75-90 wt% of water-soluble inorganic salt.
Preferably, the molding sand in the step S200 is one or more of silica sand, mullite sand, zircon sand and magnesia, and the particle size of the molding sand is 70-200 meshes.
Preferably, the inorganic salt used in the saturated solution of inorganic salt in step S300 is the same as the inorganic salt described in step S100.
Preferably, the sintering temperature in step S500 is T, wherein T is 590-690 ℃.
Preferably, the water-soluble polymer material in the additive is one or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide and the like.
Preferably, the water-soluble inorganic salt in the additive is one or more of chloride, bromide, carbonate, sulfate, phosphate, nitrate and meta-aluminate, and the cations of the water-soluble inorganic salts are the same.
Preferably, the organic acid in the additive is one or more of acetic acid, citric acid, oxalic acid and sulfonic acid.
Preferably, the method is carried out by adopting a device which comprises a molding sand spraying unit, a core curing unit, a core soaking unit and a core sintering unit, wherein the molding sand spraying unit comprises a liquid preparation bin, a liquid spraying device, a spreading device and an infrared heating plate, the liquid preparation bin is used for storing prepared spraying liquid, the spreading device is used for spreading molding sand, the liquid spraying device is used for spraying the spraying liquid to the spread molding sand so that the molding sand is gathered and condensed into a core to be cured, and the infrared heating plate is used for preheating and shaping the core to be cured; the core curing unit is used for carrying out microwave heating curing on the core to be cured to form a curing core; the core infiltration unit is used for infiltrating the solidified core; the core sintering unit is used for sintering the core to be sintered.
Preferably, the molding sand 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 and is sprayed injection liquid on moving guide, be provided with the stone device between material receiving platform and the moving guide, this stone device is used for laying the molding sand 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 an infrared pre-cured water-soluble mold core, which comprises the steps of S100, preparing a spray liquid; s200, droplet liquid spraying forming and infrared heating pre-solidifying; s300, soaking or spraying an inorganic salt solution; s400, intermittent microwave curing; s500, sintering; after the mold core is subjected to microwave hardening and preforming, the mold core is subjected to inorganic salt solution infiltration, secondary microwave curing and sintering, and the injection solution contains a high polymer material which is easy to absorb infrared rays, so that water is easy to dissipate in the infrared heating process, and the water-soluble mold core with higher initial strength is obtained;
(2) according to the rapid forming method of the infrared pre-cured water-soluble mold core, inorganic salt and organic high polymer materials are added into the injection liquid, so that the water-soluble mold core can obtain higher initial strength; and by controlling the pH value of the jet liquid to be 7, the problem of short service life of the micro-droplet liquid-jet nozzle is solved;
(3) the invention relates to a rapid forming method of an infrared precured water-soluble mold core, which is characterized in that a powder bed completing a printing task is subjected to integral microwave heating, wherein a part sprayed with micro liquid drops is cured after being heated, and a part not sprayed with the micro liquid drops can protect the part sprayed with the micro liquid drops, so that the mold core is prevented from being scratched in the conveying process, and the mold core is still kept in a loose state after being subjected to microwave heating. 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 core is high, the water dissipation of the inner layer is difficult, and the strength of the 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 mold core;
(4) the device adopted by the rapid forming method for the infrared pre-cured water-soluble mold core comprises a molding sand spraying unit, a mold core curing unit, a mold core infiltration unit and a mold core sintering unit, the mold-free rapid manufacturing of the mold core is realized through a liquid spraying device and a material paving device, the mold core curing unit realizes simultaneous internal and external heating through microwave heating, and an intermittent microwave heating mode is favorable for full dissipation of inner layer moisture, so that the strength of the mold core is ensured.
Drawings
FIG. 1 is a schematic diagram of an apparatus for rapid formation of an infrared pre-cured water-soluble core of the present invention;
FIG. 2 is a flow chart of a method of rapid formation of an infrared pre-cured water-soluble core of the present invention.
The reference numerals in the schematic drawings illustrate:
100. a molding sand 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; 180. an infrared heating plate;
200. a core curing unit; 210. a microwave oven; 220. a support; 230. the mold core is to be solidified;
300. a core infiltration unit; 310. an inorganic salt solution tank; 320. curing the mold core;
400. a core sintering unit; 410. sintering furnace; 420. and (5) sintering the mold 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 method for quickly forming the infrared pre-cured water-soluble core comprises the following steps:
s100, preparing a spray liquid, uniformly mixing water and an additive to prepare an aqueous solution with the viscosity of 1-10cps and the pH value of 7;
s200, droplet spray forming and infrared heating pre-fixing, wherein the molding sand is flatly laid on the lifting workbench 163, the spray device 122 sprays the aqueous solution configured in the S100 according to the droplet spray path generated by the core solid model, and after the droplet spray of the layer is finished, the infrared heating plate 180 is opened to perform infrared heating and curing on the layer. After curing, the lifting workbench 163 descends by 0.01-1 mm, and the subsequent droplet liquid spraying process and the infrared heating precuring process of the discrete layers are sequentially completed until the liquid spraying and curing processes of all the discrete layers are completed;
s300, infiltrating an inorganic salt solution, taking out the mold core after the injection molding, and infiltrating the inorganic salt solution for no more than 5 min;
s400, intermittent microwave curing, namely placing the soaked mold core in a microwave oven 210 for intermittent microwave heating curing, and taking out after the water in the mold core is fully dissipated;
s500, sintering, namely placing the core obtained by 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 step S100 comprises the following components: 10-20 wt% of water-soluble polymer material, 0-5 wt% of organic acid and 75-90 wt% of water-soluble inorganic salt. The water-soluble polymer material is one or more of starch, cellulose, polyethylene glycol, polyacrylamide and the like; the organic acid is one or more of acetic acid, citric acid, oxalic acid and sulfonic acid; the water-soluble inorganic salt is one or more of chloride, bromide, carbonate, sulfate, phosphate, nitrate and meta-aluminate.
The medium-sized sand in the step S200 can be one or more of silica sand, mullite sand, zircon sand and magnesia, and the granularity of the molding sand is 70-200 meshes. The inorganic salt used in the saturated solution of the inorganic salt in the step S300 is the same as the inorganic salt described in the step S100. The sintering temperature in step S500 is T, and T is 590 to 690 ℃. The cations of the various water-soluble inorganic salts in the additive are the same. The inorganic salt solution in step S300 is the same as the inorganic salt solution in step S100.
10-20 wt% of water-soluble polymer material, 0-5 wt% of organic acid and 75-90 wt% of water-soluble inorganic salt; the water-soluble polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide and the like; the organic acid is one or more of acetic acid, citric acid, oxalic acid and sulfonic acid; the water-soluble inorganic salt is one or more of chloride, bromide, carbonate, sulfate, phosphate, nitrate and meta-aluminate. The water-soluble high molecular material plays a role in ensuring the low-temperature bonding strength, the water-soluble inorganic salt is a main bonding agent, the core strength is ensured at medium and high temperatures, and the organic acid plays a role in regulating the pH value. 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. Because the inorganic salt has relatively low solution degree in water and the amount of solution sprayed by the droplet liquid spraying nozzle is relatively small, the initial strength obtained by independently spraying the inorganic salt solution is low, and the addition of the water-soluble high polymer material can obviously improve the initial strength of the core. After the infiltration treatment, the content of inorganic salt in the mold core is obviously increased, and the strength of the mold core can be obviously improved. Under high-temperature sintering, the water-soluble high polymer material is decomposed at high temperature, so that the gas evolution of the mold core can be reduced, and the strength of the mold core is improved.
The proportion relation of each component of the additive is as follows: 10-20 wt% of water-soluble polymer material, 0-5 wt% of organic acid and 75-90 wt% of water-soluble inorganic salt. The configuration process comprises the following steps: firstly, respectively dissolving a water-soluble high molecular material and a water-soluble inorganic salt in water, then mixing the water-soluble high molecular material and the water-soluble inorganic salt, measuring the pH value of the mixture, then dripping organic acid into the mixture by using a burette, and adjusting the pH value of the mixed solution to be 7. 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 mold core is too high. The organic acid has a certain corrosion effect on the sprayer because the aqueous solution of the used inorganic salt is neutral or alkaline, the pH value of the solution can be adjusted by adding the organic acid, but the solution is acidic due to the excessive content of the acid, and the sprayer is corroded. The water-soluble inorganic salt is a binder of the core, and the higher content is better theoretically, but the core is not high in initial strength due to the limited solution degree in water solution and the limited amount of solution sprayed by a spray head, and therefore, the water-soluble high polymer material accounts for 10-20 wt%.
The integral core is printed and cured layer by layer, and the layer is thin, and the solution contains a high polymer material which can easily absorb infrared rays, so that the water loss is easy in the infrared heating process, and the water-soluble core with higher initial strength can be obtained. In the traditional heating and curing mode, the heat transfer is from outside to inside, the outer layer of the mold core with a larger size is easily cured, and the phenomenon that a large amount of water is still not fully dissipated in time still exists in the inner layer, so that the strength of the mold core is lower, and the mold core is cracked even in the core making process.
The method is implemented by adopting a device which comprises a molding sand spraying unit 100, a core curing unit 200, a core infiltration unit 300 and a core sintering unit 400, wherein the molding sand spraying unit 100 comprises a liquid preparation bin 120, a liquid spraying device 122 and a spreading device 142, the liquid preparation bin 120 is used for storing prepared spraying liquid, the spreading device 142 is used for spreading molding sand, and the liquid spraying device 122 is used for spraying the spraying liquid to the spread molding sand so as to enable the molding sand to be gathered and condensed into the core 230 to be cured; the core curing unit 200 is used for microwave heating and curing the core 230 to be cured into a curing core 320, and the curing core 230 is placed on the bracket 220; the core infiltration unit 300 is used for infiltrating the solidified core 320; the core sintering unit 400 is used to sinter the core 420 to be sintered.
The molding sand 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 molding sand, the molding sand comprises one or more of silica sand, mullite sand, zircon sand and magnesia sand, and the granularity of the molding sand is 70-200 meshes; 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, the powder bed 164 is arranged on the surface of the lifting workbench 163, the lower end of the lifting workbench 163 is provided with a working cavity 161 and a piston 162, 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 molding sand to the receiving platform 141, and the spreading device 142 is used for spreading the molding sand to the receiving platform 141.
The operation of the sand-spraying unit 100 is as follows: firstly, the prepared injection liquid is put into the liquid preparation bin 120, the molding sand mixture is added into the mixing device 110, the molding sand mixture falling onto the material receiving platform 141 through the material outlet 111 is flatly paved on the powder bed 164 placed on the lifting workbench 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, an infrared heating plate 180 is mounted on the fixed guide rail 132, and the infrared heating plate 180 is also controlled by the controller 170 to slide along the fixed guide rail 132 so as to preheat and fix a to-be-cured mold core 230; the data interface 171 of the controller 170 is connected to the upper computer, and the controller 170 downloads a running track file of the discrete-level droplet spraying device obtained by layering and dispersing the CAD geometric solid model of the sand core generated by the upper computer so as to control the 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 core curing unit 200 of the present embodiment includes a microwave oven 210, and the microwave oven 210 is used for intermittent microwave heating of the core 230 to be cured, and the core 230 to be cured becomes the cured core 320 after being completely cured.
The core infiltration unit 300 of the embodiment comprises an inorganic salt solution tank 310, wherein the inorganic salt solution tank 310 contains an inorganic salt solution with the same inorganic salt component as the spraying liquid, and the inorganic salt solution tank 310 is used for infiltrating the curing core 320, and the infiltration time t1, t1 < 5 min.
The core sintering unit 400 of the embodiment comprises a sintering furnace 410, wherein the sintering furnace 410 is used for sintering the core 420 to be sintered, the sintering temperature is T, T is 400-.
Example 2
The above-mentioned "infiltrating" can also be realized by other means, such as by spraying, and the method for rapidly forming the infrared pre-cured water-soluble core of the embodiment includes:
s100, preparing a spraying liquid, dissolving water, polyvinyl alcohol, sodium chloride, sodium carbonate and oxalic acid in water, and preparing an aqueous solution with the viscosity of 3cps and the pH value of 7;
s200, forming microdroplet liquid spraying of the water-soluble mold core and intermittent infrared heating pre-curing, namely flatly laying 100/140-mesh silica sand on a lifting workbench, spraying the aqueous solution configured in the S100 by a liquid spraying device 122 according to a microdroplet liquid spraying path generated by the mold core solid model, and opening an infrared heating plate 180 to perform intermittent infrared heating curing on the layer after microdroplet liquid spraying on the layer is finished. After curing, the lifting table 163 descends by 0.1mm, and the subsequent droplet spraying process and the intermittent infrared heating precuring process of the discrete layers are sequentially completed until all the spraying and curing processes of the discrete layers are completed;
s300, spraying inorganic salt solution, taking out the core after infrared pre-curing, and spraying Na+//Cl-、CO32-—H2Spraying the solution of the O system at normal temperature for 10-15 s;
s400, intermittent microwave heating and curing, namely placing the sprayed mold core in a microwave oven 210 for intermittent heating, and taking out the mold core after the water in the solution in the mold core is completely lost;
s500, placing the core obtained by microwave curing in a sintering furnace 410 for sintering, wherein the sintering temperature is 780 +/-10 ℃, and the sintering time is 1-2 h.
Example 3
The method for quickly forming the infrared pre-cured water-soluble core comprises the following steps:
s100, preparing a spray solution, dissolving water, polyethylene glycol, polyacrylamide, potassium chloride, potassium carbonate and citric acid in water, and preparing an aqueous solution with the viscosity of 2cps and the pH value of 7;
s200, carrying out microdroplet spraying forming and continuous infrared heating precuring on the water-soluble mold core, uniformly mixing 70/100-mesh silica sand and 100/140-mesh magnesia sand according to the proportion of 7:3, then flatly paving the mixture on a lifting workbench 163, spraying the aqueous solution configured in the S100 by a spraying device 122 according to a microdroplet spraying path generated by a mold core solid model, and opening an infrared heating plate 180 to carry out infrared heating precuring on the layer after microdroplet spraying on the layer is finished. After curing, the lifting table 163 descends by 0.2mm, and the subsequent droplet spraying process and infrared heating precuring of the discrete layers are sequentially completed until all the spraying and curing processes of the discrete layers are completed;
s300, soaking in inorganic salt solution, taking out the core after infrared pre-curing, and soaking in K+//Cl-、CO32-—H2The O system is a solution at normal temperature, and the soaking time is 20-30 s;
s400, intermittent microwave heating and curing, namely, placing the soaked core in a microwave oven 210 for intermittent heating, and taking out the core after the core is completely cured.
Example 4
The method for quickly forming the infrared pre-cured water-soluble core comprises the following steps:
s100, preparing a spraying liquid, dissolving water, polyethylene glycol, polyacrylamide, sodium chloride, sodium carbonate and sulfonic acid in water, and preparing an aqueous solution with the viscosity of 3cps and the pH value of 7;
s200, droplet spray forming and intermittent infrared pre-curing of the water-soluble mold core, uniformly mixing 70/100-mesh silica sand and 100/140-mesh mullite sand according to the proportion of 7:3, then flatly spreading the mixture on a lifting workbench 163, spraying the aqueous solution configured in the S100 by a liquid spraying device 122 according to a droplet spray path generated by a mold core solid model, and opening an infrared heating plate 180 to perform intermittent infrared heating curing on the layer after droplet spray on the layer is finished. After curing, the lifting table 163 descends by 0.03mm, and the subsequent droplet liquid spraying process and the intermittent infrared pre-curing process of the discrete levels are sequentially completed until the liquid spraying and curing processes of all the discrete levels are completed;
s300, soaking in inorganic salt solution, taking out the core after infrared pre-curing, and soaking in Na+//Cl-、CO32-—H2The O system is a solution at normal temperature, and the soaking time is 10-15 s;
s400, intermittent microwave heating and curing, namely placing the soaked mold core in a microwave oven 210 for intermittent heating, and taking out the mold core after the water in the solution in the mold core is completely lost;
s500, placing the core obtained by microwave curing in a sintering furnace 410 for sintering, wherein the sintering temperature is 780 +/-10 ℃, 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 (9)
1. A rapid forming method of an infrared pre-cured water-soluble core is characterized by comprising the following steps:
s100, preparing a spray liquid, uniformly mixing water and an additive to prepare an aqueous solution with the viscosity of 1-10cps and the pH value of 7; the additive comprises a water-soluble high polymer material;
s200, droplet liquid spraying forming and infrared heating pre-curing, wherein molding sand is flatly laid on a lifting workbench (163), a liquid spraying device (122) sprays water solution configured in the S100 according to a droplet liquid spraying path generated by the mold core solid model, after droplet liquid spraying of the layer is finished, an infrared heating plate is opened to carry out infrared heating curing on the layer, after curing, the lifting workbench (163) descends for 0.01-1 mm, and the subsequent droplet liquid spraying process and the infrared heating pre-curing process of the discrete layer are sequentially finished until the liquid spraying and curing processes of all the discrete layers are finished;
s300, infiltrating an inorganic salt solution, taking out the mold core after the injection molding, and infiltrating the inorganic salt solution, wherein the infiltration time is t1, and t1 is less than 5 min;
s400, intermittent microwave curing, namely placing the soaked mold core in a microwave oven (210) for intermittent microwave heating curing, and taking out the mold core after the moisture in the mold core is fully dissipated;
s500, sintering, namely placing the core obtained by microwave curing in a sintering furnace (410) for sintering, wherein the sintering temperature is T, T is 400-.
2. The method of claim 1, wherein the additives of step S100 comprise the following components: 10-20 wt% of water-soluble polymer material, 0-5 wt% of organic acid and 75-90 wt% of water-soluble inorganic salt.
3. The method for rapid formation of an infrared pre-cured water-soluble core as claimed in claim 1, wherein: in the step S200, the molding sand is one or more of silica sand, mullite sand, zircon sand and magnesia, and the granularity of the molding sand is 70-200 meshes.
4. The method for rapid formation of an infrared pre-cured water-soluble core as claimed in claim 1, wherein: the sintering temperature in step S500 is T, and T is 590 to 690 ℃.
5. The method for rapid formation of an infrared pre-cured water-soluble core as claimed in claim 2, wherein: the water-soluble polymer material in the additive is one or more of starch, cellulose, polyethylene glycol, epoxy resin and polyacrylamide.
6. The method for rapid formation of an infrared pre-cured water-soluble core as claimed in claim 2, wherein: the water-soluble inorganic salt in the additive is one or more of chloride, bromide, carbonate, sulfate, phosphate, nitrate and meta-aluminate, and the cations of various water-soluble inorganic salts are the same.
7. The method for rapid formation of an infrared pre-cured water-soluble core as claimed in claim 2, wherein: the organic acid in the additive is one or more of acetic acid, citric acid, oxalic acid and sulfonic acid.
8. A method for the rapid formation of infrared pre-cured water soluble cores according to any one of claims 1 to 7, characterized in that: the method is carried out by adopting a device, the device comprises a molding sand spraying unit (100), a core curing unit (200), a core soaking unit (300) and a core sintering unit (400), the molding sand spraying unit (100) comprises a liquid preparation bin (120), a liquid spraying device (122), a spreading device (142) and an infrared heating plate (180), the liquid preparation bin (120) is used for storing prepared spraying liquid, the spreading device (142) is used for laying molding sand, the liquid spraying device (122) is used for spraying the spraying liquid to the laid molding sand so that the molding sand is gathered into a core (230) to be cured, and the infrared heating plate (180) is used for pre-heating and shaping the core (230) to be cured; the core curing unit (200) is used for carrying out microwave heating curing on the core (230) to be cured into a curing core (320); the core infiltration unit (300) is used for infiltrating the solidified core (320); the core sintering unit (400) is used for sintering the core (420) to be sintered.
9. The method of claim 8, wherein the rapid prototyping of infrared pre-cure water-soluble core comprises: the molding sand 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 spreading device (142) is used for spreading the molding sand mixture to the material receiving platform (141).
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