CN110976769A - Method for manufacturing mould shell of alloy precision casting - Google Patents
Method for manufacturing mould shell of alloy precision casting Download PDFInfo
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- CN110976769A CN110976769A CN201911346108.5A CN201911346108A CN110976769A CN 110976769 A CN110976769 A CN 110976769A CN 201911346108 A CN201911346108 A CN 201911346108A CN 110976769 A CN110976769 A CN 110976769A
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- mould shell
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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 method for manufacturing a mould shell of an alloy precision casting, which specifically comprises the following steps: the method comprises the steps of S1, wax mold manufacturing, S2, silica sol preparation, S3, coating treatment, S4, formwork dewaxing and self-checking, S5, high-temperature roasting, S6 and formwork roasting strengthening treatment, and relates to the technical field of casting mold processing. The method for manufacturing the mould shell of the alloy precision casting can realize rapid and efficient simultaneous and thorough cleaning of impurities on the surface and inside of the mould shell, well achieves the purpose of ensuring that the surface has no cracks, peeling and peeling when the mould shell is roasted, greatly reduces the impurity content of the mould shell of the silica sol mould shell in the roasting process, realizes full cleaning of a large amount of burrs and impurities generated on the surface and inside of the mould shell, does not need to spend a large amount of time to clean the mould shell every time by production personnel, reduces the labor intensity of the production personnel, and greatly improves the working efficiency of the production personnel.
Description
Technical Field
The invention relates to the technical field of processing of casting molds, in particular to a method for manufacturing a mold shell of an alloy precision casting.
Background
The alloy is a solid product with metal property obtained by mixing and melting one or more metals or nonmetals, cooling and solidifying, is a substance with metal property synthesized by two or more metals and metals or nonmetals by a certain method, is generally obtained by melting into uniform liquid and solidifying, can be divided into binary alloy, ternary alloy and multi-element alloy according to the number of constituent elements, is mostly produced by adopting a casting method in the production process, and a casting mould shell is required to be used for auxiliary processing in the casting process.
The existing formwork is mostly made by using a silica sol type formwork, however, the existing silica sol type formwork has higher impurity content in the roasting process, a large amount of burrs and impurities generated on the surface and inside of the formwork can not be fully cleaned, and each time, a large amount of time is spent by production personnel to clean the formwork, so that the labor intensity of the production personnel is increased, the working efficiency of the production personnel is greatly reduced, the rapid and efficient simultaneous thorough cleaning of the surface and the impurities inside of the formwork can not be realized, the purpose of ensuring that the surface of the formwork is crack-free, peeling and peeling when the formwork is roasted can not be achieved, and great inconvenience is brought to the production of the formwork of the production personnel.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for manufacturing a formwork of an alloy precision casting, which solves the problems that the existing silica sol type formwork has high impurity content of the formwork in the roasting process, a large amount of burrs and impurities generated on the surface and inside of the formwork cannot be fully cleaned, and each time a production worker needs to spend a large amount of time to clean the formwork, the labor intensity of the production worker is increased, the working efficiency of the production worker is greatly reduced, the impurities on the surface and inside of the formwork cannot be thoroughly cleaned at the same time quickly and efficiently, and the purpose that the surface has no cracks, peels and peels during the roasting of the formwork cannot be guaranteed.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for manufacturing a formwork of an alloy precision casting specifically comprises the following steps:
s1, manufacturing a wax mold: firstly, respectively measuring wax-making raw materials required by a batching device, then sequentially pouring the wax-making raw materials into a heating device at the heating temperature of 70-75 ℃ to fuse the wax-making raw materials, then transferring the molten material into a die device, pressing the molten material into a die through the die device, cooling and forming to obtain a wax die, then sequentially finishing, welding, cleaning and inspecting, and putting into use after the wax die is qualified;
s2, preparation of silica sol rubber: firstly, respectively measuring required silica sol materials by a batching device, then measuring a wetting agent and a defoaming agent, adding the wetting agent and the defoaming agent into a coating barrel, then adding silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 22-25 ℃, the relative humidity is 45-65%, after all the materials are added, continuously stirring for 3-5h, measuring the viscosity after stabilization, if the viscosity is higher than the standard viscosity, adding silica sol for dilution, and if the viscosity is lower than the standard viscosity, adding refractory powder for supplement until the viscosity is qualified;
s3, coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, immersing the wax mold qualified in the step S1 into the stirring barrel, rotating the wax mold to move up and down, fully and uniformly wetting the coating with the mold set, taking out and rotating the wax mold to ensure that no coating is accumulated and dropped on the surface of the wax mold, uniformly attaching sand grains on the coating through a sand hanging device, wherein the viscosity and density of each layer of coating are required to be as shown in figure 2, drying the coating for 4-8 hours through a drying device after each sand hanging until the last layer of sand is hung, and finishing the drying treatment;
s4, dewaxing and self-checking the formwork: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 90-95 ℃, dewaxing is carried out by adopting water bath, the dewaxing time is 20-50min, sand grains or paint are prevented from entering a mould shell due to water boiling, and then the mould shell after dewaxing is taken out for self-inspection;
s5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a mold opening facing downwards, roasting at the temperature of 900-;
s6, formwork roasting reinforcement treatment: and (2) putting the formwork roasted in the step (S6) into a roasting box, removing the flanging of the pouring gate and floating sand, enabling the opening of the formwork to face downwards, uniformly beating and arranging the formwork around the opening of the formwork, removing ash, sand and floating dust on the surface of the cavity, blowing out the ash in the cavity and the floating dust on the surface of the cavity by using compressed air, putting the formwork into ultrasonic cleaning equipment, adding clear water to enable the clear water to just submerge the formwork, starting the equipment to ultrasonically clean for 1-2h, cleaning the cavity of the formwork, removing internal dregs, lightly shaking the formwork again, putting the formwork into the box, covering the pouring gate by using a asbestos board after filling sand, covering the upper opening of the sand box by using asbestos boards with two half notches, roasting the box type resistance of the roasting box to 900 ℃, preserving heat for 1-2h to obtain a formwork.
Preferably, the wax making raw material in the step S1 includes, by weight: 70-80 parts of paraffin and 20-30 parts of stearic acid.
Preferably, the silica sol material in the step S2 includes, by weight: 40-50 parts of silica sol, 20-30 parts of refractory material, 5-10 parts of surfactant and 5-10 parts of defoaming agent.
Preferably, the surfactant is one or more of fatty alcohol-polyoxyethylene ether, sodium linear alkylbenzene sulfonate or lauroyl glutamic acid, and the defoaming agent is one or more of n-octanol, silicone emulsion, polyoxypropylene glycerol ether or polydimethylsiloxane.
Preferably, in the step S3, a 20-30 mesh screen is used to filter sand impurities in the coating to prevent sand particles from falling off from the mold shell to cause ash inclusion and sand inclusion in the casting.
Preferably, in the step S6, the asbestos gauge is ensured to cover the entire upper opening of the sand box and extend out of the edge of the explosion skin of the sand box, so as to prevent the explosion skin of the sand box from falling into the mold shell during the baking to pouring process to cause ash inclusion of the casting, if the pouring gate is damaged, the cup opening is exposed with sand grains, the casting is stopped to be used, and the casting is repaired and reused after passing the inspection.
Preferably, the refractory material is one or more of bauxite, magnesite, zircon powder or graphite.
(III) advantageous effects
The invention provides a method for manufacturing a mould shell of an alloy precision casting. Compared with the prior art, the method has the following beneficial effects: the method for manufacturing the mould shell of the alloy precision casting comprises the following steps: s1, manufacturing a wax mold: firstly, respectively measuring wax-making raw materials required by a batching device, then sequentially pouring the wax-making raw materials into a heating device, wherein the heating temperature is 70-75 ℃, so that the wax-making raw materials are fused, and S2, preparing the silica-soluble sizing material: firstly, respectively measuring required silica sol materials through a batching device, then measuring a wetting agent and a defoaming agent, adding the wetting agent and the defoaming agent into a coating barrel, then adding silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 22-25 ℃, the relative humidity is 45-65%, S3, and coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, then immersing the wax mould qualified in the step S1 into the stirring barrel, and rotating to move the wax mould up and down, S4, dewaxing the mould shell and self-checking: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 90-95 ℃, dewaxing by adopting a water bath, and S5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a mold opening facing downwards, roasting at the temperature of 900-: the mould shell baked in the step S6 is put into a baking box, the pouring gate flanging and the floating sand are removed, the mould shell is arranged with the opening facing downwards and the periphery evenly, the dust inclusion, the sand inclusion and the floating dust on the surface of the mould cavity are removed, then compressed air is used for blowing off dust and floating dust on the surface of the mold cavity, so that impurities on the surface and the inside of the mold shell can be quickly and efficiently and simultaneously and thoroughly cleaned, the mold shell is well ensured to be roasted, the purpose that the surface does not have crackle, peels off and skinning, greatly reduced silica sol type mould shell impurity content in the calcination process, realized fully rinsing a large amount of burrs and impurity that produce to mould shell surface and inside, need not to take a large amount of time to clear up the mould shell at every turn for the producer, alleviateed producer's intensity of labour, improved producer's work efficiency greatly to the preparation of producer's mould shell has been made things convenient for greatly.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph of viscosity density requirement data for each coating of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the embodiment of the present invention provides three technical solutions: a method for manufacturing a formwork of an alloy precision casting specifically comprises the following embodiments:
example 1
S1, manufacturing a wax mold: firstly get required system wax raw materials through dispensing equipment volume respectively, then pour into in the firing equipment with each system wax raw materials in proper order, heating temperature is 73 ℃, make system wax raw materials fuse, then shift the melt to moulding-die equipment in, through moulding-die equipment, impress the melt into the mould, the cooling takes shape to obtain the wax matrix, later in proper order maintain, weld, wash and inspect, after the inspection is qualified, can put into use, system wax raw materials include according to the weight ratio: 75 parts of paraffin and 25 parts of stearic acid;
s2, preparation of silica sol rubber: firstly, respectively measuring required silica sol materials through a batching device, then measuring a wetting agent and a defoaming agent, adding the silica sol into a coating barrel, then adding the silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 24 ℃, the relative humidity is 55%, after the silica sol is completely added, continuously stirring for 4 hours, measuring the viscosity after stabilization, if the viscosity is higher than the standard viscosity, adding the silica sol for dilution, if the viscosity is lower than the standard viscosity, adding refractory powder for supplement, and until the viscosity is qualified, wherein the silica sol materials comprise the following components in parts by weight: 45 parts of silica sol, 25 parts of refractory material, 7 parts of surfactant and 7 parts of defoaming agent, wherein the surfactant is a composition of fatty alcohol-polyoxyethylene ether, linear alkyl benzene sulfonate and lauroyl glutamic acid, the defoaming agent is a composition of n-octanol, emulsified silicone oil, polyoxypropylene glycerol ether and polydimethylsiloxane, and the refractory material is a composition of bauxite, magnesite, zircon powder and graphite;
s3, coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, immersing the wax mold qualified in the step S1 into the stirring barrel, rotating the wax mold to move up and down to fully and uniformly wet the coating on the die set, taking out and rotating the wax mold to ensure that no coating is accumulated and dripped on the surface of the wax mold, uniformly attaching sand grains on the coating through a sand hanging device, drying for 6 hours through a drying device after each sand hanging until the last layer of sand hanging is finished, and filtering sand grain impurities in the coating by using a 25-mesh screen when coating on the surface layer to prevent sand grains in a die shell from falling off to cause casting ash inclusion and sand inclusion;
s4, dewaxing and self-checking the formwork: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 93 ℃, dewaxing is carried out by adopting water bath, the dewaxing time is 35min, sand grains or paint are prevented from entering a mould shell due to water boiling, and then the mould shell after dewaxing is taken out for self-inspection;
s5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a downward die opening, roasting at 1000 ℃, keeping the temperature for 1.5 hours after the temperature is reached, taking out and pouring, and discharging when the temperature is 400 ℃ when boxing is required;
s6, formwork roasting reinforcement treatment: loading the mould shell roasted in the step S6 into a roasting box, removing the flanging of a pouring gate and floating sand, placing the mould shell with a downward opening, uniformly beating and arranging the mould shell around the opening, removing ash, sand and floating dust on the surface of a cavity, blowing out the ash in the cavity and the floating dust on the surface of the cavity by using compressed air, then placing the mould shell into ultrasonic cleaning equipment, adding clear water to ensure that the clear water just submerges the mould shell, starting the equipment for ultrasonic cleaning for 1.5h, cleaning the mould cavity of the mould shell, removing internal dregs, lightly shaking the mould shell again, loading the mould shell into the box, covering the pouring gate by using a asbestos board after filling sand, covering the upper opening of a sand box by using asbestos boards with two half notches, roasting the box type resistor to 900 ℃, preserving the temperature for 1.5h to obtain a mould shell body, then pouring, ensuring that the asbestos board is large enough to cover the upper opening of the whole sand box and extend out the edge of a sand blocking box to prevent the sand box from exploding skin in the pouring, if the pouring gate is damaged and sand grains are exposed at the cup opening, the cup is stopped to be used, and the cup is repaired and reused after being qualified through inspection.
Example 2
S1, manufacturing a wax mold: firstly get required system wax raw materials through dispensing equipment volume respectively, then pour into each system wax raw materials in heating equipment in proper order, heating temperature is 70 ℃, make system wax raw materials fuse, then shift the melt to moulding-die equipment in, through moulding-die equipment, impress the melt into the mould, the cooling takes shape to obtain the wax matrix, later in proper order maintain, weld, wash and inspect, after the inspection is qualified, can put into use, system wax raw materials include according to the weight ratio: 70 parts of paraffin and 20 parts of stearic acid;
s2, preparation of silica sol rubber: firstly, respectively measuring required silica sol materials through a batching device, then measuring a wetting agent and a defoaming agent, adding the silica sol into a coating barrel, then adding the silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 22 ℃, the relative humidity is 45%, after the refractory material is completely added, continuously stirring for 3 hours, measuring the viscosity after stabilization, if the viscosity is higher than the standard viscosity, adding the silica sol for dilution, if the viscosity is lower than the standard viscosity, adding refractory powder for supplement, and until the viscosity is qualified, wherein the silica sol materials comprise the following components in parts by weight: 40 parts of silica sol, 20 parts of refractory material, 5 parts of surfactant and 5 parts of defoaming agent, wherein the surfactant is fatty alcohol-polyoxyethylene ether, the defoaming agent is n-octanol, and the refractory material is bauxite;
s3, coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, immersing the wax mold qualified in the step S1 into the stirring barrel, rotating the wax mold to move up and down to fully and uniformly wet the coating on the die set, taking out and rotating the wax mold to ensure that no coating is accumulated and dripped on the surface of the wax mold, uniformly attaching sand grains on the coating through a sand hanging device, drying for 4 hours through a drying device after each sand hanging until the last layer of sand hanging is finished, and filtering sand grain impurities in the coating by using a 20-mesh screen when coating on the surface layer to prevent sand grains in a die shell from falling off to cause casting ash inclusion and sand inclusion;
s4, dewaxing and self-checking the formwork: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 90 ℃, dewaxing is carried out by adopting water bath, the dewaxing time is 20min, sand grains or paint are prevented from entering a mould shell due to water boiling, and then the mould shell after dewaxing is taken out for self-inspection;
s5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a downward die opening, roasting at 900 ℃, keeping the temperature for 1h after the temperature is reached, taking out and pouring, and discharging when the temperature is 350 ℃ when boxing is needed;
s6, formwork roasting reinforcement treatment: loading the mould shell roasted in the step S6 into a roasting box, removing the flanging of a pouring gate and floating sand, placing the mould shell with a downward opening, uniformly beating and arranging the mould shell around the opening, removing ash, sand and floating dust on the surface of a cavity, blowing out the ash in the cavity and the floating dust on the surface by using compressed air, then placing the mould shell into ultrasonic cleaning equipment, adding clear water to ensure that the clear water just submerges the mould shell, starting the equipment to ultrasonically clean the mould shell for 1h, cleaning the mould shell cavity, removing internal dregs, lightly shaking the mould shell again, loading the mould shell, covering the pouring gate by using an asbestos board after filling sand, covering the upper opening of a sand box by using an asbestos board with two half notches, roasting the mould shell to 900 ℃ by using a box type resistance roaster, preserving the temperature for 1h to obtain a mould shell body, then pouring, ensuring that the size of the asbestos board covers the upper opening of the whole sand box and extends out the edge of the explosion skin of the sand blocking box to prevent the explosion skin from falling, if the pouring gate is damaged and sand grains are exposed at the cup opening, the cup is stopped to be used, and the cup is repaired and reused after being qualified through inspection.
Example 3
S1, manufacturing a wax mold: firstly get required system wax raw materials through dispensing equipment volume respectively, then pour into each system wax raw materials in heating equipment in proper order, heating temperature is 75 ℃, make system wax raw materials fuse, then shift the melt to moulding-die equipment in, through moulding-die equipment, impress the melt into the mould, the cooling takes shape to obtain the wax matrix, later in proper order maintain, weld, wash and inspect, after the inspection is qualified, can put into use, system wax raw materials include according to the weight ratio: 80 parts of paraffin and 30 parts of stearic acid;
s2, preparation of silica sol rubber: firstly, respectively measuring required silica sol materials through a batching device, then measuring a wetting agent and a defoaming agent, adding the silica sol into a coating barrel, then adding the silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 25 ℃, the relative humidity is 65%, after the silica sol is completely added, continuously stirring for 5 hours, measuring the viscosity after stabilization, if the viscosity is higher than the standard viscosity, adding the silica sol for dilution, if the viscosity is lower than the standard viscosity, adding refractory powder for supplement, and until the viscosity is qualified, wherein the silica sol materials comprise the following components in parts by weight: 50 parts of silica sol, 30 parts of refractory material, 10 parts of surfactant and 10 parts of defoaming agent, wherein the surfactant is lauroyl glutamic acid, the defoaming agent is polydimethylsiloxane, and the refractory material is graphite;
s3, coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, immersing the wax mold qualified in the step S1 into the stirring barrel, rotating the wax mold to move up and down to fully and uniformly wet the coating on the die set, taking out and rotating the wax mold to ensure that no coating is accumulated and dripped on the surface of the wax mold, uniformly attaching sand grains on the coating through a sand hanging device, drying for 8 hours through a drying device after each sand hanging until the last layer of sand hanging is finished, and filtering sand grain impurities in the coating by using a 30-mesh screen when coating on the surface layer to prevent sand grains in a die shell from falling off to cause casting ash inclusion and sand inclusion;
s4, dewaxing and self-checking the formwork: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 95 ℃, dewaxing is carried out by adopting water bath, the dewaxing time is 50min, sand grains or paint are prevented from entering a mould shell due to water boiling, and then the mould shell after dewaxing is taken out for self-inspection;
s5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a downward die opening, roasting at 1050 ℃, keeping the temperature for 2 hours after the temperature is reached, taking out and pouring, and discharging when the temperature is 450 ℃ when boxing is needed;
s6, formwork roasting reinforcement treatment: loading the mould shell roasted in the step S6 into a roasting box, removing the flanging of a pouring gate and floating sand, placing the mould shell with a downward opening, uniformly beating and arranging the mould shell around the opening, removing the ash, the sand and the floating dust on the surface of a cavity, blowing out the ash in the cavity and the floating dust on the surface by using compressed air, then placing the mould shell into ultrasonic cleaning equipment, adding clear water to just submerge the mould shell, starting the equipment for ultrasonic cleaning for 2h, cleaning the mould shell cavity, removing the internal dregs, lightly shaking the mould shell again, loading the mould shell, filling sand, covering the pouring gate by using an asbestos board, covering the upper opening of a sand box by using two halves of notched asbestos boards, roasting the mould shell to 900 ℃ by using a box type resistance roasting furnace, preserving the temperature for 2h to obtain a mould shell body, then pouring, ensuring that the size of the asbestos board covers the upper opening of the whole sand box and extends out the edge of the explosion skin of the sand blocking box to prevent the explosion skin from falling into the mould shell, if the pouring gate is damaged and sand grains are exposed at the cup opening, the cup is stopped to be used, and the cup is repaired and reused after being qualified through inspection.
Comparative experiment
A certain mold production enterprise adopts the manufacturing method of the embodiment 1-3 of the invention to respectively produce the same batch of mold shells, the reject ratio in the production process of each group of manufacturing method is recorded, meanwhile, the reject ratio data of the mold shells produced in the same batch by adopting the conventional method is selected as a control group, and the experimental results are shown in Table 1.
Table 1 comparative experimental data table
As can be seen from Table 1, the shuttering produced by the method of the embodiment 1 of the present invention has the lowest reject ratio, therefore, the best production method is shown in example 1, but the reject ratio of the shuttering manufactured by the manufacturing methods of the invention in example 2 and example 3 is lower than that of the control group, therefore, the invention can realize the rapid and high-efficiency simultaneous and complete cleaning of the impurities on the surface and inside of the shuttering, well ensure that when the shuttering is roasted, the purpose that the surface does not have crackle, peels off and skinning, greatly reduced silica sol type mould shell impurity content in the calcination process, realized fully rinsing a large amount of burrs and impurity that produce to mould shell surface and inside, need not to take a large amount of time to clear up the mould shell at every turn for the producer, alleviateed producer's intensity of labour, improved producer's work efficiency greatly to the preparation of producer's mould shell has been made things convenient for greatly.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for manufacturing a mould shell of an alloy precision casting is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, manufacturing a wax mold: firstly, respectively measuring wax-making raw materials required by a batching device, then sequentially pouring the wax-making raw materials into a heating device at the heating temperature of 70-75 ℃ to fuse the wax-making raw materials, then transferring the molten material into a die device, pressing the molten material into a die through the die device, cooling and forming to obtain a wax die, then sequentially finishing, welding, cleaning and inspecting, and putting into use after the wax die is qualified;
s2, preparation of silica sol rubber: firstly, respectively measuring required silica sol materials by a batching device, then measuring a wetting agent and a defoaming agent, adding the wetting agent and the defoaming agent into a coating barrel, then adding silica sol, starting stirring, adding a refractory material in the continuous stirring process, wherein the mixing temperature is 22-25 ℃, the relative humidity is 45-65%, after all the materials are added, continuously stirring for 3-5h, measuring the viscosity after stabilization, if the viscosity is higher than the standard viscosity, adding silica sol for dilution, and if the viscosity is lower than the standard viscosity, adding refractory powder for supplement until the viscosity is qualified;
s3, coating treatment: pouring the silica sol material prepared in the step S2 into a stirring barrel, immersing the wax mold qualified in the step S1 into the stirring barrel, rotating the wax mold to move up and down, fully and uniformly wetting the coating with the mold set, taking out and rotating the wax mold to ensure that no coating is accumulated and dripped on the surface of the wax mold, uniformly attaching sand grains on the coating through a sand hanging device, drying for 4-8 hours through a drying device after each sand hanging until the last layer of sand hanging is finished;
s4, dewaxing and self-checking the formwork: transferring the wax mould obtained in the step S3 to a water bath pool, wherein the water temperature is 90-95 ℃, dewaxing is carried out by adopting water bath, the dewaxing time is 20-50min, sand grains or paint are prevented from entering a mould shell due to water boiling, and then the mould shell after dewaxing is taken out for self-inspection;
s5, high-temperature roasting: placing the qualified formwork in the step S4 in a hearth with a mold opening facing downwards, roasting at the temperature of 900-;
s6, formwork roasting reinforcement treatment: and (2) putting the formwork roasted in the step (S6) into a roasting box, removing the flanging of the pouring gate and floating sand, enabling the opening of the formwork to face downwards, uniformly beating and arranging the formwork around the opening of the formwork, removing ash, sand and floating dust on the surface of the cavity, blowing out the ash in the cavity and the floating dust on the surface of the cavity by using compressed air, putting the formwork into ultrasonic cleaning equipment, adding clear water to enable the clear water to just submerge the formwork, starting the equipment to ultrasonically clean for 1-2h, cleaning the cavity of the formwork, removing internal dregs, lightly shaking the formwork again, putting the formwork into the box, covering the pouring gate by using a asbestos board after filling sand, covering the upper opening of the sand box by using asbestos boards with two half notches, roasting the box type resistance of the roasting box to 900 ℃, preserving heat for 1-2h to obtain a formwork.
2. A method of forming a shell of an alloy precision casting according to claim 1, characterized in that: the wax making raw materials in the step S1 comprise the following components in parts by weight: 70-80 parts of paraffin and 20-30 parts of stearic acid.
3. A method of forming a shell of an alloy precision casting according to claim 1, characterized in that: the silica sol material in the step S2 comprises the following components in parts by weight: 40-50 parts of silica sol, 20-30 parts of refractory material, 5-10 parts of surfactant and 5-10 parts of defoaming agent.
4. A method of forming a shell of an alloy precision casting according to claim 3, characterized in that: the surfactant is one or a combination of more of fatty alcohol-polyoxyethylene ether, linear alkyl benzene sodium sulfonate or lauroyl glutamic acid, and the defoaming agent is one or a combination of more of n-octanol, emulsified silicone oil, polyoxypropylene glycerol ether or polydimethylsiloxane.
5. A method of forming a shell of an alloy precision casting according to claim 1, characterized in that: in the step S3, a 20-30 mesh screen is used to filter sand impurities in the coating to prevent sand particles in the mold shell from falling off to cause ash inclusion and sand inclusion in the casting.
6. A method of forming a shell of an alloy precision casting according to claim 1, characterized in that: and in the step S6, the size of the asbestos plate is ensured to cover the upper opening of the whole sand box and extend out of the edge of the explosion leather of the sand blocking box, so that the sand box explosion leather is prevented from falling into the mould shell in the process of roasting to pouring to cause ash inclusion of the casting, if a pouring gate is damaged, the sand grains are exposed at the cup opening, the sand grains are stopped to be used, and the sand grains are repaired and reused after being qualified through inspection.
7. A method of forming a shell of an alloy precision casting according to claim 3, characterized in that: the refractory material is one or a combination of more of bauxite, magnesite, zircon powder or graphite.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911346108.5A CN110976769A (en) | 2019-12-24 | 2019-12-24 | Method for manufacturing mould shell of alloy precision casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN113787170A (en) * | 2021-09-16 | 2021-12-14 | 新乡市航宏航空机电设备有限公司 | Casting method of engine oil filter shell |
| CN114523069A (en) * | 2021-12-20 | 2022-05-24 | 江苏金瑞机械制造有限公司 | Mother alloy bar preparation formwork and preparation method thereof |
| CN114700465A (en) * | 2022-03-02 | 2022-07-05 | 中国电建集团郑州泵业有限公司 | Roasting method for final-stage guide vane investment casting formwork of double-casing pump |
| CN114918369A (en) * | 2022-06-06 | 2022-08-19 | 盐城凯兴达精密铸造有限公司 | Manufacturing process of investment casting silica sol mold shell |
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