CN114570878B - Shell preparation process based on microwave dewaxing technology - Google Patents
Shell preparation process based on microwave dewaxing technology Download PDFInfo
- Publication number
- CN114570878B CN114570878B CN202210184422.3A CN202210184422A CN114570878B CN 114570878 B CN114570878 B CN 114570878B CN 202210184422 A CN202210184422 A CN 202210184422A CN 114570878 B CN114570878 B CN 114570878B
- Authority
- CN
- China
- Prior art keywords
- shell
- wax
- microwave
- conveyer belt
- dewaxing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The shell preparation process based on the microwave dewaxing technology can enhance the microwave heating effect of the manufactured wax mould by adding nano silicon carbide powder into the wax liquid, so that the wax is quickly lost in the final dewaxing step, the dewaxing speed in the preparation process is increased, and the shell preparation efficiency is improved; and according to the whole volume of the shell needing dewaxing, the shell is selected to pass through shielding cases with different sections, so that the requirement of completely removing the wax mould in the shell is met, and the power consumption of the microwave dewaxing system can be reduced.
Description
Technical Field
The invention relates to the technical field of precision investment casting, in particular to a shell preparation process based on a microwave dewaxing technology.
Background
As known, the prior investment casting industry mostly adopts high-pressure 0.8Mpa steam to remove the wax mould in the mould shell, but because the steam source is an oil-fired boiler or an electric heating boiler, the mould shell is emptied after the steam is removed of wax, in order to avoid cracking during dewaxing, a dewaxing kettle is usually required to be preheated to 150 ℃ to work, so that a large amount of energy is inevitably consumed, and when the temperature in the dewaxing kettle is very high and is filled into the mould shell, if the temperature is not increased to be more than 0.4Mpa, the mould shell is trapped to crack due to the heating expansion of the wax mould shell, and the quality of castings is affected; the process generally requires that the shell reaches 0.4Mpa within 14 seconds after being installed, three processes of closing a kettle door, opening a steam valve and filling and pressurizing are carried out in the middle, the time is very compact, and the shell burst phenomenon also occurs frequently in many factories;
in addition, steam generates a large amount of condensed water while heating the shell in the dewaxing kettle, the water is mixed into wax liquid, and in order to remove the water, the water is highly stranded in a dewatering barrel for more than ten hours to meet the recycling requirement, so that a large amount of electric energy is consumed, and energy waste and atmospheric pollution are caused by the discharge of waste steam and the discharge of waste gas of a heat source boiler;
therefore, although the equipment price is high, the consumed energy is less, and the microwave dewaxing technology with less pollution is put into the eyes of enterprises, and the microwave heating principle of the microwave dewaxing technology is that electromagnetic waves with specific wavelength are utilized to act on a heated object to force molecules of the heated object to vibrate strongly, so that the object is heated in a non-contact physical heating process; the microwave heating is characterized in that microwaves can penetrate into the object to a certain depth, rather than the surface is heated, and heat is transferred into the object by means of heat conduction of the object, so that the device has the characteristics of large heating depth, high speed and automatic balance, and the device is used for dewaxing, and the dewaxing device is used for dewaxing by heating and melting wax liquid by microwaves so as to achieve the purpose of dewaxing, so that the device is a dewaxing process with development potential, particularly in precision casting of titanium alloy investment, the problem that most of binders are dissolved back when meeting water after being dried is solved, and the poison of organic solvents to human bodies is avoided;
in addition, the microwave dewaxing technology only rapidly heats polar water molecules by utilizing a microwave heating principle, and the mold shell contains a certain amount of water, so that the mold shell is rapidly heated, and the absorption capacity of mold materials to microwaves is small, so that a very high temperature gradient is formed between the mold shell and the mold materials, and the surface layer of the mold materials is melted into liquid to form a fluid layer to counteract the tension of the mold shell caused by the rising temperature and expansion of the mold materials in the later stage, thereby realizing the dewaxing process, and reducing the breakage rate of the mold shell after dewaxing by utilizing the microwave dewaxing technology; however, in the traditional shell making process, phenomena such as skin falling and the like often occur due to insufficient adhesive force of materials in the multilayer sand coating process;
moreover, the prior art microwave dewaxing device has the following disadvantages:
(1) Only one shell can be dewaxed at a time, and the dewaxing efficiency is lower for factory production, so that the overall production progress of castings is slowed down;
(2) When the wax liquid flows out from the lower side surface of the metal cavity in the microwave generating equipment, the wax liquid remains on the metal wall, and in the metal cavity with high energy density, the residual wax liquid can be quickly carbonized into conductors to be ignited and burnt, and when serious, the electronic ignition and back-fire can burn internal components such as a microwave generator, a dewaxing trolley and the like in the microwave generating equipment, so that the device is thoroughly damaged;
(3) Because the size and the weight of each shell are different in the actual dewaxing production, namely the load entering the cavity of the microwave generating equipment is different every time, if dewaxing is carried out by adopting fixed power, the phenomenon of lightning strike can be formed when the energy density in the cavity is too high and no load is absorbed when the load is too low, and the magnetron is directly burnt when the load is severe;
(4) The microwave emitted by a single microwave emitting port has single mode and single propagation direction in the cavity, so that uneven heating can cause uneven heating of the shell part to crack and dewaxing failure;
in view of the foregoing, there is a need in the market for a shell that can quickly complete the dewaxing process in a microwave heating system.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a shell preparation process based on a microwave dewaxing technology.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a shell preparation process based on a microwave dewaxing technology comprises the following steps:
1) Melting the wax into a molten wax;
2) Adding 0.5-1% of nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1.2+/-0.2, coating the surface mortar outside a wax mould, and drying for 7-10 hours at the temperature of 22-28 ℃ and the humidity of 55-65% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1.1+/-0.1, coating the back layer mortar outside the surface layer of the shell, and drying for 12-14 hours under the environment that the temperature is 22-28 ℃ and the humidity is 50% -60%;
5) Repeating the step 4) for 3-4 times to finally prepare a molded shell;
6) Putting the shell into a microwave dewaxing system for dewaxing operation to finally obtain a hollow shell;
the microwave dewaxing system comprises a wax receiving seat for placing the shell and receiving the wax liquid flowing out of the shell,
a heating conveyer belt for driving the wax receiving seat to move and simultaneously heating the shell in the wax receiving seat by microwaves,
the drying conveyer belt can receive the wax receiving seat on the heating conveyer belt and convey and dry the wax receiving seat and the inner shell;
wherein the top of heating conveyer belt corresponds and is equipped with the shield cover, is equipped with the intermediate layer that is used for installing microwave heater in the shield cover, and the shield cover is established to the multistage, connects through the transition pipe between the adjacent two sections shield covers, and the heating conveyer belt that is located transition pipe department corresponds the intercommunication with dry conveyer belt, and the transition pipe is established to the opening towards the side of dry conveyer belt.
Preferably, 1-5% of short graphite whisker is added into the mullite mortar.
Preferably, the heating conveyer belt is set to the S-shaped, and the shield cover is set to three sections, and first section shield cover corresponds the head end of covering the heating conveyer belt to first bending part, and second section shield cover corresponds the second bending part of covering the heating conveyer belt, and third section shield cover corresponds the other part of covering the heating conveyer belt.
Preferably, the microwave heater comprises a microwave high-frequency generator and a plurality of wave guide tubes, wherein the wave guide tubes are uniformly and symmetrically arranged on two sides of the top surface of the heating conveyer belt, the wave guide tubes are correspondingly connected with the microwave high-frequency generator, and the microwave high-frequency generator is arranged outside the heating conveyer belt.
Preferably, the microwave generating areas of the waveguides on the same side in each shielding case are respectively distributed in a staggered manner.
Preferably, a transfer mechanism capable of transferring the wax receiving seat onto the drying conveyor belt is arranged outside the transition pipe.
Preferably, the transfer mechanism is an ejection cylinder, the telescopic end of the ejection cylinder correspondingly stretches into the transition pipe, and the telescopic end faces the direction of the drying conveyer belt.
Preferably, the wax receiving seat comprises a chassis, a supporting rod, a wax collecting bin and a fixing frame, wherein the supporting rod is vertically arranged on the top surface of the chassis, the supporting rod is correspondingly connected with the bottom surface of the wax collecting bin, the top surface of the wax collecting bin is set to be an opening surface, and the fixing frame for placing the shell is arranged on the top surface of the wax collecting bin.
Preferably, the drying conveyer belt comprises a conveying roller line and a drying box, wherein the front half part of the conveying roller line is used for receiving a wax receiving seat transferred on the heating conveyer belt, and the rear half part of the conveying roller line is provided with the drying box.
Preferably, a microwave generator is arranged in the drying box, and the power of the microwave generator is 2.3-2.6KW.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the shell preparation process based on the microwave dewaxing technology, the nano silicon carbide powder is added into the wax liquid, so that the microwave heating effect of the manufactured wax mould can be enhanced, the wax is rapidly lost in the final dewaxing step, the dewaxing speed in the preparation process is increased, and the shell preparation efficiency is improved;
in addition, according to the whole volume of the shell needing dewaxing, the shell passes through shielding cases with different sections, so that the requirement of completely removing the wax mould in the shell is met, and the power consumption of a microwave dewaxing system can be reduced;
in addition, through adding short graphite whisker in the mullite mortar, the shell material is converted into a fiber reinforced composite material, so that the structural strength of the shell is enhanced, the shell is ensured not to deform in the microwave heating process, and after the graphite whisker is added, the shell has good microwave heating effect, so that the shell is heated more uniformly when the microwave heating type shell is used, and finally the prepared shell has higher quality.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention;
fig. 2 is a schematic structural view of the wax receiving base.
In the figure: 1. a wax receiving seat; 101. a chassis; 102. a support rod; 103. a wax collecting bin; 104. a fixing frame; 2. heating the conveyor belt; 3. drying the conveyer belt; 301. a conveying roller line; 302. a drying box; 3021. an air outlet; 3022. an air inlet; 303. a wind collecting hood; 4. a shield; 401. a first-stage shield; 402. a second-stage shield; 403. a third section of shielding cover; 5. a transition pipe; 6. a microwave high frequency generator; 7. a waveguide; 8. and a transfer mechanism.
Detailed Description
In the description, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., the drawings merely correspond to the drawings of the present invention, and in order to facilitate description of the present invention, it is not indicated or implied that the device or element referred to must have a specific azimuth:
a process for preparing a shell based on a microwave dewaxing technique as described with reference to figures 1-2:
1) Melting the wax into a molten wax;
2) Adding 0.5-1% of nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
the silicon carbide nano powder is added into the wax pattern material for investment casting, so that on one hand, the microwave thermal effect of the wax pattern can be enhanced, and the influence on the fluidity of the wax pattern is small, and the wax can be quickly lost during the microwave dewaxing, so that the dewaxing speed is improved; on the other hand, the adverse effect of the traditional steam wax loss or hot water wax loss on the shell is eliminated;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1.2+/-0.2, coating the surface mortar outside a wax mould, and drying for 7-10 hours at the temperature of 22-28 ℃ and the humidity of 55-65% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1.1+/-0.1, coating the back layer mortar outside the surface layer of the shell, and drying for 12-14 hours under the environment that the temperature is 22-28 ℃ and the humidity is 50% -60%;
5) Repeating the step 4) for 3-4 times to finally prepare a molded shell;
6) Putting the shell into a microwave dewaxing system for dewaxing operation to finally obtain a hollow shell;
the microwave dewaxing system comprises a wax receiving seat 1 for placing a molded shell and receiving wax liquid flowing out of the molded shell,
a heating conveyer belt 2 for driving the wax receiving seat 1 to move and simultaneously heating the shell in the wax receiving seat 1 by microwaves,
the wax receiving seat 1 on the heating conveying belt 2 can be received, and the wax receiving seat 1 and the drying conveying belt 3 for conveying and drying the internal shell are connected, wherein the drying equipment in the drying conveying belt 3 heats the shell to remove moisture in the shell, so that the purpose of drying the shell is achieved, the prepared shell is higher in structural strength through heating, and the casting process of a subsequent casting is smoother;
the top of the heating conveyor belt 2 is correspondingly provided with a shielding cover 4, an interlayer for installing a microwave heater is arranged in the shielding cover 4, the shielding covers 4 are in a plurality of sections, two adjacent sections of shielding covers 4 are connected through a transition pipe 50, the side surface of the transition pipe 50, which faces the drying conveyor belt 3, is provided with an opening, a wax receiving seat 1 positioned at the transition pipe 50 can move onto the drying conveyor belt 3, the top surfaces of the heating conveyor belt 2 and the drying conveyor belt 3 are provided with a plurality of conveying rollers, and the wax receiving seat 1 is moved through the rotation of the conveying rollers; in addition, because the part of the conveying rollers of the heating conveying belt 2 positioned at the transition pipe 50 and the part of the conveying rollers of the corresponding drying conveying belt 3 are in a parallel state, the wax receiving seat 1 translates under the action of external force at the moment, and the transfer can be completed; in addition, for the shells with different volumes, the time required by the microwave dewaxing is different, so that the time required by the microwave dewaxing of the shells is calculated by analyzing the volumes of the shells, and the shells are selected to pass through a plurality of sections of shielding covers 4, so that the requirement of completely removing the wax pattern in the shells is met, and the power consumption of the whole microwave dewaxing system can be reduced.
Preferably, 1-5% of short graphite whiskers are added into the mullite mortar;
1. the structure in the back layer of the shell can be provided with a fiber supporting structure, so that the overall strength of the shell is enhanced, and the number of layers of sand hanging can be reduced due to the enhancement of the overall strength of the shell, thereby having the effect of saving materials,
2. the manufactured shell has stronger microwave heating effect, so that the shell is heated more uniformly in the microwave heating process, the quality of the manufactured shell is higher, and the manufacturing of investment castings with larger sizes is facilitated.
Preferably, the heating conveyor belt 2 is S-shaped, the shielding cover 4 is three sections, the first section of shielding cover 401 covers the head end of the heating conveyor belt 2 to the first bending part correspondingly, the second section of shielding cover 402 covers the second bending part of the heating conveyor belt 2 correspondingly, and the third section of shielding cover 403 covers the rest part of the heating conveyor belt 2 correspondingly; through the S-shaped heating conveyer belt 2, on the one hand, the whole floor area of the microwave dewaxing system can be reduced, on the other hand, the drying conveyer belt 3 is arranged at the second bending point of the heating conveyer belt 2, and two sides of the drying conveyer belt 3 can respectively correspond to the tail ends of the three sections of shielding covers 4, so that the shape of the drying conveyer belt 3 can be simply set to be linear, and the distance from the wax receiving seat 1 to the drying box 302 on the drying conveyer belt 3 is shortened.
Preferably, the microwave heater comprises a microwave high-frequency generator 6 and a plurality of wave guide tubes 7, wherein the wave guide tubes 7 are arranged in a plurality, the wave guide tubes 7 are uniformly and symmetrically arranged on two sides of the top surface of the heating conveyer belt 2, the wave guide tubes 7 are correspondingly connected with the microwave high-frequency generator 6, the microwave high-frequency generator 6 is arranged outside the heating conveyer belt 2, the microwave high-frequency generator 6 is used for providing a microwave energy source for the wave guide tubes 7, then the wave guide tubes 7 provide heat for the shielding cover 4, the heating conveyer belt 2 moves on the wax receiving seat 1 to heat, and finally, the heating dewaxing operation of the shells on the wax receiving seat 1 is realized, and in addition, the working power of the microwave high-frequency generator is 1.2-1.5KW.
Preferably, the microwave generating areas of the wave guide pipes 7 positioned at the same side in each shielding case are respectively and correspondingly distributed in a staggered mode in sequence, so that the wax pattern in the mold shell can be directionally melted from bottom to top, the wax liquid in the mold shell can be ensured to be sufficiently heated and melted, and the wax liquid is prevented from accumulating in the mold shell.
Preferably, the transition pipe 50 is provided with a transfer mechanism 8 capable of transferring the wax receiving seat 1 to the drying conveyer belt 3, when the shell placed on the wax receiving seat 1 passes through the shielding cover 4 of a predetermined number, after the internal wax mould is completely removed, the wax receiving seat 1 can be propped onto the drying conveyer belt 3 through the transfer mechanism 8 outside the corresponding transition pipe 50, so that the wax receiving seat 1 can perform subsequent drying operation.
Preferably, the transferring mechanism 8 is configured as an ejection cylinder, the telescopic end of the ejection cylinder correspondingly stretches into the transition pipe 50, the telescopic end faces the direction of the drying conveyer belt 3, a top plate is arranged at the end of the telescopic end, and the contact area between the ejection cylinder and the wax receiving seat 1 can be increased through the top plate, so that the transferring process of the wax receiving seat 1 is smoother.
Preferably, the wax receiving seat 1 comprises a chassis 101, a supporting rod 102, a wax collecting bin 103 and a fixing frame 104, the top surface of the chassis 101 is vertically provided with the supporting rod 102, the chassis 101 is circular, so that when the wax receiving seat 1 moves on a heating conveying line, the side edge of the heating conveying line can be rotated, the situation that the wax receiving seat 1 is blocked is avoided, the supporting rod 102 is correspondingly connected with the bottom surface of the wax collecting bin 103, the top surface of the wax collecting bin 103 is provided with an opening surface for allowing wax liquid flowing out of a molded shell to pass through, so that the wax liquid enters the bin for collection, the top surface of the wax collecting bin 103 is provided with the fixing frame 104 for placing the molded shell, the bottom of the fixing frame 104 is provided with a diamond frame, four corners of the diamond frame are correspondingly fixedly connected with the top surface of the wax collecting bin, four corners of the top surface of the diamond frame are vertically provided with a fixing rod, the four fixing rods are used for keeping the molded shell placed on the diamond frame to be fixed, and the center of the diamond frame is used for allowing the wax liquid under the molded shell to pass through;
in addition, be equipped with the collection box that can pull to the outside of collection wax storehouse in the collection wax storehouse, this collection box is used for collecting wax liquid, and after the dewaxing of a shell is accomplished, can take out the collection box to pour the wax liquid of the inside, be used for recycle.
Preferably, the drying conveyer belt 3 comprises a conveyer roller line 301 and a drying box 302, wherein the front half part of the conveyer roller line 301 is used for receiving the wax receiving seat 1 transferred on the heating conveyer belt 2, and the rear half part of the conveyer roller line 301 is provided with the drying box 302.
Preferably, a microwave generator is disposed in the drying oven 302, and the power of the microwave generator is 2.3-2.6KW, that is, the drying oven 302 heats and dries the dewaxed shell in a microwave heating manner, and in addition, the preparation of the shell can be completed finally by high-power microwave heating and baking, so that the shell has higher structural strength.
One example of shell preparation is:
1) Melting the wax into a molten wax;
2) Adding 0.5% nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1, coating the surface mortar outside a wax mould, and drying for 7 hours at a temperature of 22 ℃ and a humidity of 55% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1, coating the back layer mortar outside the surface layer of the shell, and drying for 12 hours under the environment with the temperature of 22 ℃ and the humidity of 50%;
5) Repeating the step 4) for 3 times to finally prepare a molded shell;
6) And (5) putting the shell into a microwave dewaxing system for dewaxing operation, and finally obtaining the hollow shell.
A second example of shell preparation is:
1) Melting the wax into a molten wax;
2) Adding 1% of nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1.4, coating the surface mortar outside a wax mould, and drying for 10 hours at the temperature of 28 ℃ and in an environment with the humidity of 65% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1.2, coating the back layer mortar outside the surface layer of the shell, and drying for 14 hours under the environment with the temperature of 28 ℃ and the humidity of 60%;
5) Repeating the step 4) for 4 times to finally prepare a molded shell;
6) And (5) putting the shell into a microwave dewaxing system for dewaxing operation, and finally obtaining the hollow shell.
A third example of shell preparation is:
1) Melting the wax into a molten wax;
2) Adding 0.8% nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1.2, coating the surface mortar outside a wax mould, and drying for 8 hours at a temperature of 25 ℃ and a humidity of 60% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1.1, coating the back layer mortar outside the surface layer of the shell, and drying for 13 hours under the environment with the temperature of 25 ℃ and the humidity of 55%;
5) Repeating the step 4) for 4 times to finally prepare a molded shell;
6) And (5) putting the shell into a microwave dewaxing system for dewaxing operation, and finally obtaining the hollow shell.
The invention has not been described in detail in the prior art, and it is apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A shell preparation process based on a microwave dewaxing technology is characterized by comprising the following steps of:
1) Melting the wax into a molten wax;
2) Adding 0.5-1% of nano silicon carbide powder into the wax liquid, and then injecting to form a wax mould;
3) Preparing surface mortar from zirconium sand and water glass in a ratio of 1:1.2+/-0.2, coating the surface mortar outside a wax mould, and drying for 7-10 hours at the temperature of 22-28 ℃ and the humidity of 55-65% to form a surface layer of a forming shell;
4) Preparing back layer mortar from the mullite sand and water glass in a ratio of 1:1.1+/-0.1, coating the back layer mortar outside the surface layer of the shell, and drying for 12-14 hours under the environment that the temperature is 22-28 ℃ and the humidity is 50% -60%;
5) Repeating the step 4) for 3-4 times to finally prepare a molded shell;
6) Putting the shell into a microwave dewaxing system for dewaxing operation to finally obtain a hollow shell;
the microwave dewaxing system comprises a wax receiving seat (1) for placing a molded shell and receiving wax liquid flowing out of the molded shell, the wax receiving seat (1) comprises a chassis (101), a supporting rod (102), a wax collecting bin (103) and a fixing frame (104), the supporting rod (102) is vertically arranged on the top surface of the chassis (101), the supporting rod (102) is correspondingly connected with the bottom surface of the wax collecting bin (103), the top surface of the wax collecting bin (103) is set to be an opening surface, the fixing frame (104) for placing the molded shell is arranged on the top surface of the wax collecting bin (103),
the heating conveying belt (2) is used for driving the wax receiving seat (1) to move and simultaneously carrying out microwave heating on the shell in the wax receiving seat (1);
a drying conveyer belt (3) which can receive the wax receiving seat (1) on the heating conveyer belt (2) and convey and dry the wax receiving seat (1) and the inner shell;
the top of the heating conveyer belt (2) is correspondingly provided with a shielding cover (4), an interlayer for installing a microwave heater is arranged in the shielding cover (4), the microwave heater comprises a microwave high-frequency generator (6) and a plurality of wave guide tubes (7), the wave guide tubes (7) are uniformly and symmetrically arranged on two sides of the top surface of the heating conveyer belt (2), the wave guide tubes (7) are correspondingly connected with the microwave high-frequency generator (6), and the microwave high-frequency generator (6) is arranged outside the heating conveyer belt (2);
the shielding covers (4) are arranged in a plurality of sections, and microwave generation areas of wave guide pipes (7) positioned on the same side in the plurality of shielding covers (4) are respectively and correspondingly distributed in a staggered mode in sequence; the two adjacent sections of shielding covers (4) are connected through a transition pipe (5), a heating conveying belt (2) positioned at the transition pipe (5) is correspondingly communicated with the drying conveying belt (3), and the side surface of the transition pipe (5) facing the drying conveying belt (3) is provided with an opening.
2. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 1, wherein: short graphite whisker in 1-5% is added into the Molai mortar.
3. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 1, wherein: the heating conveyer belt (2) is set to the S-shaped, and shield cover (4) are set to the syllogic, and first section shield cover (401) corresponds the head end of covering heating conveyer belt (2) to first bending part, and second section shield cover (402) corresponds the second bending part of covering heating conveyer belt (2), and third section shield cover (403) corresponds the other part of covering heating conveyer belt (2).
4. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 1, wherein: the transition pipe (5) is provided with a transfer mechanism (8) which can transfer the wax receiving seat (1) onto the drying conveyer belt (3).
5. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 4, wherein: the transfer mechanism (8) is arranged as an ejection oil cylinder, the telescopic end of the ejection oil cylinder correspondingly stretches into the transition pipe (5), and the telescopic end faces the direction of the drying conveyer belt (3).
6. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 1, wherein: the drying conveyer belt (3) comprises a conveying roller line (301) and a drying box (302), wherein the front half part of the conveying roller line (301) is used for receiving a wax receiving seat (1) transported on the heating conveyer belt (2), and the rear half part of the conveying roller line (301) is provided with the drying box (302).
7. The process for preparing a shell based on the microwave dewaxing technique as claimed in claim 6, wherein: a microwave generator is arranged in the drying oven (302), and the power of the microwave generator is 2.3-2.6KW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184422.3A CN114570878B (en) | 2022-02-28 | 2022-02-28 | Shell preparation process based on microwave dewaxing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184422.3A CN114570878B (en) | 2022-02-28 | 2022-02-28 | Shell preparation process based on microwave dewaxing technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114570878A CN114570878A (en) | 2022-06-03 |
| CN114570878B true CN114570878B (en) | 2023-05-16 |
Family
ID=81771550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210184422.3A Active CN114570878B (en) | 2022-02-28 | 2022-02-28 | Shell preparation process based on microwave dewaxing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114570878B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880466A (en) * | 2016-05-04 | 2016-08-24 | 满根法 | Microwave dewaxing method and microwave dewaxing furnace |
| CN107262671A (en) * | 2017-07-01 | 2017-10-20 | 连云港源钰金属制品有限公司 | Lost wax casting technique dewaxing device and method |
| CN209716382U (en) * | 2019-03-29 | 2019-12-03 | 东风精密铸造有限公司 | A kind of automation model casting dewaxing production line |
| CN110814290A (en) * | 2019-12-14 | 2020-02-21 | 东营正大金属制品有限公司 | Efficient energy-saving type mold shell microwave paraffin removal device and use method thereof |
-
2022
- 2022-02-28 CN CN202210184422.3A patent/CN114570878B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880466A (en) * | 2016-05-04 | 2016-08-24 | 满根法 | Microwave dewaxing method and microwave dewaxing furnace |
| CN107262671A (en) * | 2017-07-01 | 2017-10-20 | 连云港源钰金属制品有限公司 | Lost wax casting technique dewaxing device and method |
| CN209716382U (en) * | 2019-03-29 | 2019-12-03 | 东风精密铸造有限公司 | A kind of automation model casting dewaxing production line |
| CN110814290A (en) * | 2019-12-14 | 2020-02-21 | 东营正大金属制品有限公司 | Efficient energy-saving type mold shell microwave paraffin removal device and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114570878A (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103411428B (en) | A kind of art pottery microwave agglomerating furnace | |
| CN101786161B (en) | Microwave irradiation pressurized sintering equipment and use method thereof | |
| CN1307121C (en) | Method for processing ceramics using electromagnetic energy | |
| CN105880466B (en) | Microwave dewaxing method and microwave dewaxing furnace | |
| CN108746496B (en) | Preparation method of mold shell for investment casting | |
| CN114570878B (en) | Shell preparation process based on microwave dewaxing technology | |
| CN210187362U (en) | Silicon material microwave heating device | |
| CN104891970A (en) | Manufacturing method of quartz ceramic crucible | |
| CN109095899B (en) | Preparation method of alumina-based ceramic particle preform | |
| AU2021107132A4 (en) | Vacuum sintering furnace | |
| CN105965916A (en) | Equipment and process for forming composite material | |
| CN209830191U (en) | Investment casting mould | |
| CN108213394A (en) | A kind of fuel element tube socket casting method | |
| CN209163924U (en) | Radiator integral type water tank | |
| CN207751329U (en) | A kind of open-close type resistance furnace for integral heat insulation | |
| CN201227622Y (en) | Integral solidifying device for container | |
| CN102794401B (en) | Precision investment casting production device and process | |
| CN113462866B (en) | Automatic temperature control die for processing special steel castings | |
| CN209244014U (en) | A kind of common brick | |
| JPS62289344A (en) | Dewaxing method in production of precision casting mold | |
| CN213645778U (en) | Investment device for investment casting | |
| CN111558702B (en) | Device and method for preparing ceramic coating of centrifugal cast tube | |
| CN203212592U (en) | Roaster for swinging sluice liner of blast furnace | |
| CN108339947A (en) | A kind of resin-coated sand shell mould process units for producing container angle | |
| CN102636023A (en) | Energy-efficient fully-automatic electric tunnel kiln |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 471000 No. 3, Yingzhou Science Park, high tech Zone, Luoyang City, Henan Province Applicant after: Luoyang Kepin Titanium Industry Co.,Ltd. Address before: 471000 No.3, Yingzhou science and Technology Park, dongshapo, sunqitun, high tech Zone, Luoyang City, Henan Province Applicant before: Luoyang KEPIN Industrial Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |