CN113231602B - High-performance composite casting mold for aluminum alloy casting - Google Patents
High-performance composite casting mold for aluminum alloy casting Download PDFInfo
- Publication number
- CN113231602B CN113231602B CN202011494958.2A CN202011494958A CN113231602B CN 113231602 B CN113231602 B CN 113231602B CN 202011494958 A CN202011494958 A CN 202011494958A CN 113231602 B CN113231602 B CN 113231602B
- Authority
- CN
- China
- Prior art keywords
- sand
- heat
- powder
- casting
- stirring
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 59
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 168
- 239000004576 sand Substances 0.000 claims description 88
- 238000003756 stirring Methods 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 26
- 239000000377 silicon dioxide Substances 0.000 claims description 25
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 25
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 23
- 239000005011 phenolic resin Substances 0.000 claims description 23
- 229920001568 phenolic resin Polymers 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 235000019738 Limestone Nutrition 0.000 claims description 17
- 239000006028 limestone Substances 0.000 claims description 17
- 229910052845 zircon Inorganic materials 0.000 claims description 13
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims description 12
- 239000000314 lubricant Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000007767 bonding agent Substances 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 description 9
- 230000008023 solidification Effects 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 5
- 229910018182 Al—Cu Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- LBLYYCQCTBFVLH-UHFFFAOYSA-N 2-Methylbenzenesulfonic acid Chemical compound CC1=CC=CC=C1S(O)(=O)=O LBLYYCQCTBFVLH-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/068—Semi-permanent moulds
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a composite casting mould for casting high-performance aluminum alloy, which is characterized in that: the sand-lined metal external mold and the high heat-conducting sand core enclose to form a cavity, a runner communicated with the cavity is further arranged on the sand-lined metal external mold, the runner comprises a straight runner at the end of a far-form cavity and a gap runner at the end of a near-form cavity, sand-lined layers are arranged on the wall of the runner and the outer wall of the cavity, and a heat-insulating coating is further arranged outside the sand-lined layer on the wall of the runner. The invention can effectively solve the defects of shrinkage cavity, looseness and the like of the casting.
Description
Technical Field
The invention relates to a composite casting mold for casting a high-performance aluminum alloy and a preparation method thereof, belonging to the field of aluminum alloy precision casting.
Background
With the advance of light weight, high-performance aluminum alloy castings are used as bearing parts of key structures in aviationThe application in the fields of spaceflight, weapons, ships and the like is increasingly wide. The Al-Cu alloy has wide crystallization temperature range (about 100 ℃), poor fluidity, large hot cracking tendency, difficult realization of sequential solidification, easy occurrence of quality problems of shrinkage cavity, looseness and the like in the casting. The aluminum alloy has pasty solidification characteristic Al-Cu alloy, the effective feeding distance of a riser is short, the feeding effect of the middle lower part of a casting is poor, the solidification structure is not compact, alpha solid solution overgrows when the alloy is solidified, and theta (Al) is formed 2 Cu）、T(Al 12 Mn 2 Cu) and the like are segregated at the grain boundary, so that the casting has coarse grains and low performance, and therefore, a reasonable temperature field must be established to ensure the sequential solidification of the casting in order to solve the problems of the Al-Cu alloy casting.
At present, related researches are also developed aiming at the problems of serious shrinkage cavity, serious looseness and the like of the Al-Cu alloy casting in China, the related researches mainly focus on the aspects of temperature regulation and control modes such as casting water cooling, air cooling, local heating and the like, a certain effect is achieved, and the regulation and control effect on the solidification defect of the casting is limited.
Disclosure of Invention
The invention aims to provide a high-performance aluminum alloy casting mold capable of realizing sequential solidification.
In order to achieve the above object, the present invention is realized by: a casting mold for casting high-performance aluminum alloy is characterized in that: the sand-lined metal external mold and the high heat-conducting sand core enclose to form a cavity, a runner communicated with the cavity is further arranged on the sand-lined metal external mold, the runner comprises a straight runner at the end of a far-form cavity and a gap runner at the end of a near-form cavity, sand-lined layers are arranged on the wall of the runner and the outer wall of the cavity, and a heat-insulating coating is further arranged outside the sand-lined layer on the wall of the runner.
The high-heat-conductivity sand core is of a hollow structure, and the aperture is phi 150-phi 350 mm.
The heat-insulating coating is prepared from 35-40 wt% of silica powder, 25-30 wt% of zircon powder, 10-15 wt% of graphite powder, 5-8 wt% of phenolic resin and 25-30 wt% of absolute ethyl alcohol.
The high-heat-conductivity sand core is prepared from 40-45 wt% of 30-50-mesh limestone sand, 35-40 wt% of 70-80-mesh carbonaceous sand, 25-30 wt% of 40-60-mesh iron powder, 0.6-1.0% of low-furfuryl alcohol resin adhesive and 0.8-1.2% of p-toluenesulfonic acid curing agent.
The high-thermal-conductivity sand core is prepared from 85-90 wt% of 50-60 mesh silica sand, 2-3 wt% of phenolic resin, 10-12 wt% of curing agent, 6-9 wt% of lubricant, 0.2-0.5 wt% of dispersing agent and 0.1-0.3 wt% of short wave fiber.
A preparation method of a sand-coated metal external mold comprises the following steps:
(1) baking the metal outer die to 40-50 ℃,
(2) a sand shooting machine is adopted to prepare a uniform sand-coated layer on the inner surface, the thickness is 5-20 mm,
(3) and preparing uniform heat-insulating coating by adopting a stirring method, and preparing a heat-insulating coating with the thickness of 2-5 mm in a sprue and a gap gate in a spraying mode.
A preparation method of a high heat conduction sand core, which is prepared by the following steps,
(1) firstly, the low furfuryl alcohol resin and the p-toluenesulfonic acid are uniformly mixed for standby use through a stirrer,
(2) adding limestone sand, carbonaceous sand and iron powder into the mixture obtained in the step (1) in proportion, then adding a curing agent and a bonding agent in proportion while stirring, stirring uniformly,
(3) and (3) placing the mixed powder in the step (2) in a sand core mold, and naturally hardening for 2-3 h.
Has the beneficial effects that:
1. the heat-insulating coating formula is a heat-insulating coating prepared by adding low-heat-conductivity refractory fillers such as silica powder and zircon powder, and the heat-conducting coefficient is only 0.42 W.m -2 •K -1 The heat insulation performance is good, the heat insulation inhibition effect reaches 90%, the highest temperature resistance reaches 2000 ℃, and the heat insulation effect on the sprue and the gap gate is good.
2. The formula of the high-heat-conductivity sand core consists of limestone sand, carbonaceous sand and iron powder, has the characteristics of high heat conductivity, large heat capacity, low thermal expansion coefficient and the like, and the heat conductivity of the sand core which is uniformly mixed is as high as 930 W.m -2 •K -1 And a central hole with phi of 150-phi 350mm is arranged in the middle of the sand coreThe heat dissipation and exhaust effects are greatly improved.
3. According to the composite casting mold, a sequential solidification temperature field of a casting → a gap pouring gate → a sprue is established, the metal outer mold is beneficial to quickly dissipating heat from the outer mold when the casting is solidified, the hollow high-heat-conductivity sand area can realize quick heat dissipation and exhaust of the thickness part of the inner cavity of the casting, the defects of shrinkage, looseness and the like of the casting can be effectively overcome, the tensile strength of the specified part of the body of the ZL205A high-performance aluminum alloy casting is improved from 350-450 MPa to 480-520 MPa, and the internal quality is improved from II-III level to I level.
4. The composite casting preparation process has the characteristics of strong applicability, simple operation, clear flow, high stability and the like, realizes batch production on the resin sand mold antigravity casting of large-scale high-performance aluminum alloy castings, and has high popularization and application values and great industrial potential.
Drawings
FIG. 1 is a cross-sectional view of a mold of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a composite casting mold of a high-performance aluminum alloy cabin casting.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are still within the scope of the present invention claimed in the claims.
Example (b): as shown in fig. 1-3, the casting mold for casting the high-performance aluminum alloy comprises a sand-coated metal outer mold 5 and a high-heat-conductivity sand core 7, wherein a cavity 4 is enclosed by the sand-coated metal outer mold and the high-heat-conductivity sand core, a runner communicated with the cavity is further arranged on the sand-coated metal outer mold, the runner comprises a straight runner 2 at a far cavity end and a gap runner 3 at a near cavity end and communicated with the cavity, a sand-coated layer 6 is arranged on the wall of the runner and the outer wall of the cavity, and a heat-insulating coating 1 is further arranged outside the sand-coated layer on the wall of the runner.
The high-thermal-conductivity sand core in the embodiment is of a hollow structure, and the aperture is phi 150-phi 350 mm.
Fig. 3 also provides a concrete structure of the casting mold, which further comprises a bottom plate 8, a lower bottom box 9 and an upper bottom box 10, which are sequentially stacked, wherein the high-heat-conductivity sand core and the sand-coated metal outer mold are arranged on the upper bottom box, and a box cover 11 is further arranged on the high-heat-conductivity sand core and the sand-coated metal outer mold.
In addition, in the embodiment, the heat-insulating coating is prepared from 35-40 wt% of silica powder, 25-30 wt% of zircon powder, 10-15 wt% of graphite powder, 5-8 wt% of phenolic resin and 25-30 wt% of absolute ethyl alcohol.
The proportion of the heat-insulating coating can be selected, such as silica powder can be selected but not limited to 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, and the like; zircon powder can be selected from, but is not limited to, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, etc.; the graphite powder can be selected from but not limited to 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt% and the like; the phenolic resin can be selected from, but not limited to, 5wt%, 6wt%, 7wt%, 8wt%, etc.; the absolute ethanol may be selected from, but not limited to, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, etc.
In the embodiment, the high-heat-conductivity sand core is prepared from 40-45 wt% of 30-50-mesh limestone sand, 35-40 wt% of 70-80-mesh carbonaceous sand, 25-30 wt% of 40-60-mesh iron powder, 0.6-1.0% of low-furfuryl alcohol resin adhesive and 0.8-1.2% of p-toluenesulfonic acid curing agent.
The proportioning relation of the high-heat-conductivity sand core can be provided with various choices, such as 40wt%, 41wt%, 42wt%, 43wt%, 44wt%, 45wt% and the like of limestone sand; the carbonaceous sand can be selected from, but not limited to, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, etc.; iron powder can be selected from, but not limited to, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, etc.; the low furfuryl alcohol resin binder may be selected from, but is not limited to, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1.0wt%, etc.; the toluene sulfonic acid curing agent can be selected from, but not limited to, 0.8wt%, 0.9wt%, 1.0wt%, 1.1wt%, 1.2wt%, and the like. The limestone sand can be selected from but not limited to 30 meshes, 35 meshes, 40 meshes, 45 meshes, 50 meshes and the like, the carbonaceous sand can be selected from but not limited to 70 meshes, 75 meshes, 80 meshes and the like, and the iron powder can be selected from but not limited to 40 meshes, 45 meshes, 50 meshes, 55 meshes, 60 meshes and the like.
The limestone sand can be selected from but not limited to 30 meshes, 35 meshes, 40 meshes, 45 meshes, 50 meshes and the like, the carbonaceous sand can be selected from but not limited to 70 meshes, 75 meshes, 80 meshes and the like, and the iron powder can be selected from but not limited to 40 meshes, 45 meshes, 50 meshes, 55 meshes, 60 meshes and the like.
In the embodiment, the high-thermal-conductivity sand core is prepared from 85-90 wt% of 50-60 mesh silica sand, 2-3 wt% of phenolic resin, 10-12 wt% of curing agent, 6-9 wt% of lubricant, 0.2-0.5 wt% of dispersing agent and 0.1-0.3 wt% of short wave fiber.
With respect to the proportioning relationship of the high thermal conductive sand core, there are various choices, such as silica sand can be selected but not limited to 85wt%, 86wt%, 87wt%, 88wt%, 89wt%, 90wt%, etc., phenolic resin can be selected but not limited to 2wt%, 2.5wt%, 3wt%, etc., curing agent can be selected but not limited to 10wt%, 11wt%, 12wt%, etc., lubricant can be selected but not limited to 6wt%, 7wt%, 8wt%, 9wt%, etc., and disintegrator can be selected but not limited to 0.2 wt%, 0.3wt%, 0.4 wt%, 0.5 wt%, etc. The size of the silica sand can be selected from, but is not limited to, 50 meshes, 55 meshes, 60 meshes and the like.
In addition, this embodiment also provides a method for preparing the sand-lined metal external mold, which includes:
a preparation method of a sand-coated metal external mold comprises the following steps:
(1) baking the metal outer die to 40-50 ℃, wherein the temperature can be selected from but is not limited to 40 ℃, 45 ℃ or 50 ℃ and the like;
(2) preparing a uniform sand-coated layer on the inner surface by adopting a sand shooting machine, wherein the thickness of the uniform sand-coated layer is 5-20 mm, and a sprue and a gap sprue on a metal outer die are formed through the sand-coated layer, and the thickness can be selected from 5mm, 10mm, 15mm or 20 mm;
(3) the uniform heat-insulating coating is prepared by adopting a stirring method, a heat-insulating coating with the thickness of 2-5 mm is prepared on a sprue and a gap gate in a spraying mode, and the thickness of the heat-insulating coating can be selected but not limited to 2mm, 3mm, 4mm, 5mm and the like.
Wherein, the metal outer die can be made of aluminum alloy.
The embodiment also provides a preparation method of the high-thermal-conductivity sand core, which comprises the following steps:
(1) firstly, the low furfuryl alcohol resin and the paratoluenesulfonic acid are evenly mixed by a stirrer for standby,
(2) adding limestone sand, carbonaceous sand and iron powder into the mixture obtained in the step (1) in proportion, then adding a curing agent and a bonding agent in proportion while stirring, stirring uniformly,
(3) and (3) placing the mixed powder in the step (2) into a sand core mold, and naturally hardening for 2-3 h, wherein the hardening time can be selected from 2h, 2.5h or 3 h.
The following are three specific application examples provided for this embodiment:
application example one: the composite casting mould for preparing the high-performance aluminum alloy cabin casting has the advantages that the casting outline dimension phi is 1700 multiplied by 400mm, the material ZL205A is 3.5mm in the wall thickness of the main body, the appearance is a special-shaped curved surface, 6 windows with the size of 220 multiplied by 220mm and 2 windows with the size of 450 multiplied by 350mm are contained, and the typical cabin casting structure is formed.
1. Preparing a heat-insulating coating: weighing 5.4kg of silica powder, 4.3kg of zircon powder, 1.8kg of graphite powder, 0.9kg of phenolic resin and 3.8kg of absolute ethyl alcohol, uniformly stirring by adopting a stirrer, sequentially adding the silica powder, the zircon powder, the graphite powder and the phenolic resin, then adding the absolute ethyl alcohol while stirring, uniformly stirring, and standing for 25 min.
2. Preparing a high-heat-conductivity sand core: 758kg of limestone sand, 647kg of carbonaceous sand, 465kg of iron powder, 14.5kg of low furfuryl alcohol resin and 18kg of p-toluenesulfonic acid are weighed. Firstly, uniformly mixing low furfuryl alcohol resin and p-toluenesulfonic acid by a stirrer, then sequentially adding limestone sand, carbonaceous sand and iron powder into a sand mixer, adding a curing agent and a bonding agent while stirring, after uniform stirring, placing the mixed powder into a mold, naturally hardening for 3 hours, and forming a central hole with the diameter of 350mm in the middle of the sand core, thereby being beneficial to exhaust and heat dissipation.
3. Preparing precoated sand: 420kg of silica sand, 12.5kg of phenolic resin, 48kg of curing agent, 33.6kg of lubricant, 1.4kg of disintegrator and 0.8kg of short wave fiber are weighed, the silica sand is added into a sand mixer and stirred, then the phenolic resin, the curing agent, the lubricant and the short wave fiber are added while stirring, and after uniform stirring, a sand-coated layer with the thickness of 20mm is prepared on the inner surface of the metal external mold by adopting a sand shooting machine.
4. And preparing a 5mm heat-insulating coating on the surfaces of the sprue and the gap gate by spraying the prepared heat-insulating coating, and then closing the box.
The implementation effect is as follows: the tensile strength of the appointed part of the ZL205A aluminum alloy cabin casting body reaches 520MPa, the elongation is 8.0%, the mechanical property is improved by more than 35%, the pinhole degree is I grade, and the porosity is I grade.
Application example two: the composite casting mold for preparing a certain high-performance aluminum alloy cabin casting prepared by the invention has the following contour dimension: 750mm of large end circle phi, 610mm of small end circle phi, 720mm of height, ZL205A of material, 9.0mm of main wall thickness, 2 square windows containing 80 multiplied by 80mm, 2 square windows containing 40 multiplied by 40mm and 1 circular window phi 60mm, and a typical cabin casting structure.
1. Preparing a heat-insulating coating: weighing 3.7kg of silica powder, 3.0kg of zircon powder, 1.2kg of graphite powder, 0.6kg of phenolic resin and 2.6kg of absolute ethyl alcohol, uniformly stirring by adopting a stirrer, sequentially adding the silica powder, the zircon powder, the graphite powder and the phenolic resin, then adding the absolute ethyl alcohol while stirring, uniformly stirring, and standing for 15 min.
2. Preparing a high-heat-conductivity sand core: 454kg of limestone sand, 388kg of carbonaceous sand, 279kg of iron powder, 8.7kg of low furfuryl alcohol resin and 10.8kg of p-toluenesulfonic acid are weighed. Firstly, uniformly mixing low furfuryl alcohol resin and p-toluenesulfonic acid by a stirrer, then sequentially adding limestone sand, carbonaceous sand and iron powder into a sand mixer, adding a curing agent and a bonding agent while stirring, after uniform stirring, placing the mixed powder into a mold, naturally hardening for 2 hours, and forming a central hole with the diameter of phi 150mm in the middle of the sand core, thereby being beneficial to exhaust and heat dissipation.
3. Preparing precoated sand: weighing 210kg of silica sand, 6.2kg of phenolic resin, 23kg of curing agent, 16.5kg of lubricant, 0.6kg of disintegrator and 0.3kg of short wave fiber, adding the silica sand into a sand mixer, stirring, adding the phenolic resin, the curing agent, the lubricant and the short wave fiber while stirring, and preparing a 10mm sand-coated layer on the inner surface of the metal outer mold by using a sand shooting machine after uniformly stirring.
4. And preparing a 3mm heat-insulating coating on the surfaces of the sprue and the gap gate by spraying the prepared heat-insulating coating, and then closing the box.
The implementation effect is as follows: the tensile strength of the appointed part of the ZL205A aluminum alloy cabin casting body reaches 520MPa, the elongation is 8.0%, the mechanical property is improved by more than 35%, the pinhole degree is I grade, and the porosity is I grade.
Application example three: the composite casting mold for preparing the high-performance aluminum alloy cabin casting has the typical cabin casting structure that the casting outline dimension phi 1250 multiplied by 980mm, the material ZL205A, the main wall thickness is 4.0mm, the appearance is a special-shaped curved surface and contains 8 phi 160mm circular windows.
1. Preparing a heat-insulating coating: weighing 4.3kg of silica powder, 3.4kg of zircon powder, 1.4kg of graphite powder, 0.7kg of phenolic resin and 3.0kg of absolute ethyl alcohol, uniformly stirring by adopting a stirrer, sequentially adding the silica powder, the zircon powder, the graphite powder and the phenolic resin, then adding the absolute ethyl alcohol while stirring, uniformly stirring, and standing for 20 min.
2. Preparing a high-heat-conductivity sand core: 530kg of limestone sand, 452kg of carbonaceous sand, 325kg of iron powder, 10.2kg of low furfuryl alcohol resin and 12.6kg of p-toluenesulfonic acid are weighed. Firstly, uniformly mixing low furfuryl alcohol resin and p-toluenesulfonic acid by a stirrer, then sequentially adding limestone sand, carbonaceous sand and iron powder into a sand mixer, adding a curing agent and a bonding agent while stirring, placing the mixed powder into a mold after uniformly stirring, naturally hardening for 2.5 hours, and forming a central hole with the diameter phi of 250mm in the middle of a sand core, thereby being beneficial to exhausting and heat dissipation.
3. Preparing precoated sand: 252kg of silica sand, 7.5kg of phenolic resin, 28.8kg of curing agent, 20.2kg of lubricant, 0.8kg of dispersing agent and 0.5kg of short-wave fiber are weighed, the silica sand is added into a sand mixer and stirred, then the phenolic resin, the curing agent, the lubricant and the short-wave fiber are added while stirring, and after uniform stirring, a sand-coated layer with the thickness of 15mm is prepared on the inner surface of the metal external mold by adopting a sand shooting machine.
4. And preparing a 4mm heat-insulating coating on the surfaces of the sprue and the gap gate by spraying the prepared heat-insulating coating, and then closing the box.
The implementation effect is as follows: the tensile strength of the appointed part of the ZL205A aluminum alloy cabin casting body reaches 520MPa, the elongation is 8.0%, the mechanical property is improved by more than 35%, the pinhole degree is I grade, and the porosity is I grade.
The ZL205A alloy has aluminum alloy strength up to 500MPA and is widely applied to weapons and aerospace. However, the casting mold contains more than ten alloy elements, so that the range of the solidification temperature range reaches more than 100 ℃ (solid-liquid temperature range), and if the conventional casting mold is adopted, pasty solidification is easily caused, so that the casting is not compact, and shrinkage cavities and shrinkage porosity are caused. Through the casting mould provided by the embodiment, the ZL205A alloy component can be sequentially solidified and quickly solidified, the compactness of a casting is ensured, and the defects of shrinkage cavity, shrinkage porosity, cracks and the like of the casting are avoided.
Claims (2)
1. A composite casting mold with high performance for casting aluminum alloy is characterized in that: the sand-coated metal external mold and the high-heat-conductivity sand core are enclosed to form a cavity, a pouring gate communicated with the cavity is further arranged on the sand-coated metal external mold, the pouring gate comprises a straight pouring gate at the far cavity end and a gap pouring gate at the near cavity end, sand-coated layers are arranged on the wall of the pouring gate and the outer wall of the cavity, and a heat-insulating coating is further arranged outside the sand-coated layers on the wall of the pouring gate; the heat-insulating coating is prepared from 4.3kg of silica powder, 3.4kg of zircon powder, 1.4kg of graphite powder, 0.7kg of phenolic resin and 3.0kg of absolute ethyl alcohol; the high-heat-conductivity sand core is of a hollow structure, and the aperture is phi 150-phi 350 mm;
the preparation method comprises the following steps: (1) preparing a heat-insulating coating: weighing 4.3kg of silica powder, 3.4kg of zircon powder, 1.4kg of graphite powder, 0.7kg of phenolic resin and 3.0kg of absolute ethyl alcohol, uniformly stirring by adopting a stirrer, sequentially adding the silica powder, the zircon powder, the graphite powder and the phenolic resin, then adding the absolute ethyl alcohol while stirring, and standing for 20min after uniform stirring;
(2) preparing a high-heat-conductivity sand core: weighing 530kg of limestone sand, 452kg of carbonaceous sand, 325kg of iron powder, 10.2kg of low furfuryl alcohol resin and 12.6kg of p-toluenesulfonic acid; firstly, uniformly mixing low furfuryl alcohol resin and p-toluenesulfonic acid by a stirrer, then sequentially adding limestone sand, carbonaceous sand and iron powder into a sand mixer, adding a curing agent and a bonding agent while stirring, placing the mixed powder into a mold after uniformly stirring, naturally hardening for 2.5h, and forming a central hole with the diameter of 250mm in the middle of a sand core, so that the air exhaust and heat dissipation are facilitated;
(3) preparing precoated sand: weighing 252kg of silica sand, 7.5kg of phenolic resin, 28.8kg of curing agent, 20.2kg of lubricant, 0.8kg of dispersing agent and 0.5kg of short-wave fiber, adding the silica sand into a sand mixer, stirring, adding the phenolic resin, the curing agent, the lubricant and the short-wave fiber while stirring, and preparing a 15mm sand-coated layer on the inner surface of the metal outer mold by using a sand shooting machine after uniformly stirring;
(4) preparing a 4mm heat-insulating coating on the surfaces of a sprue and a gap gate by adopting a spraying mode, and then closing a box;
the casting has the contour dimension phi 1250 multiplied by 980mm, the material ZL205A, the wall thickness of a main body is 4.0mm, the appearance is a special-shaped curved surface, and 8 round windows with phi 160mm are included.
2. The composite mold for casting of aluminum alloy with high performance according to claim 1, wherein: the high-heat-conductivity sand core is prepared from 40-45 wt% of 30-50-mesh limestone sand, 35-40 wt% of 70-80-mesh carbonaceous sand, 25-30 wt% of 40-60-mesh iron powder, 0.6-1.0% of low furfuryl alcohol resin adhesive and 0.8-1.2% of p-toluenesulfonic acid curing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494958.2A CN113231602B (en) | 2018-08-01 | 2018-08-01 | High-performance composite casting mold for aluminum alloy casting |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494958.2A CN113231602B (en) | 2018-08-01 | 2018-08-01 | High-performance composite casting mold for aluminum alloy casting |
| CN201810863979.3A CN108941460B (en) | 2018-08-01 | 2018-08-01 | Composite casting mold for casting high-performance aluminum alloy |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810863979.3A Division CN108941460B (en) | 2018-08-01 | 2018-08-01 | Composite casting mold for casting high-performance aluminum alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113231602A CN113231602A (en) | 2021-08-10 |
| CN113231602B true CN113231602B (en) | 2022-09-27 |
Family
ID=64466604
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011494958.2A Active CN113231602B (en) | 2018-08-01 | 2018-08-01 | High-performance composite casting mold for aluminum alloy casting |
| CN201810863979.3A Active CN108941460B (en) | 2018-08-01 | 2018-08-01 | Composite casting mold for casting high-performance aluminum alloy |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810863979.3A Active CN108941460B (en) | 2018-08-01 | 2018-08-01 | Composite casting mold for casting high-performance aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN113231602B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848370A (en) * | 2019-04-03 | 2019-06-07 | 洛阳乾中新材料科技有限公司 | A kind of sand casting casting external form moulding tooling |
| CN111822677A (en) * | 2019-04-11 | 2020-10-27 | 上海航天精密机械研究所 | Light metal casting method based on composite casting mold |
| CN110180996B (en) * | 2019-07-03 | 2020-08-04 | 陈健美 | Method for eliminating cracks generated in gravity casting |
| CN110548856B (en) * | 2019-10-10 | 2021-09-07 | 北京航星机器制造有限公司 | Composite casting mold of aluminum alloy shell casting and forming method thereof |
| CN113000791B (en) * | 2021-02-23 | 2022-12-13 | 湖北华阳汽车变速系统股份有限公司 | Iron mold sand coating method for steel casting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5338578A (en) * | 1993-01-21 | 1994-08-16 | Gencorp Inc. | Method for achieving a smooth powder coated finish on a low density compression-molded plastic article |
| CN102527928A (en) * | 2012-02-29 | 2012-07-04 | 宁波市沧海新材料开发有限公司 | Alcohol-group coating for V-method casting and preparation method thereof |
| CN103008532A (en) * | 2012-12-21 | 2013-04-03 | 安徽中兴华汉机械有限公司 | Special paint for evaporative pattern aluminum alloy and manufacturing method of special paint |
| CN103764312A (en) * | 2011-08-31 | 2014-04-30 | 花王株式会社 | Adhesive agent composition for mold used in self-hardening molding and method for producing mold using the same |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4834968B1 (en) * | 1969-09-04 | 1973-10-25 | ||
| US20050247428A1 (en) * | 2004-04-20 | 2005-11-10 | Tenedora Nemak, S.A. De C.V. | Method and apparatus for casting aluminum engine blocks with cooling liquid passage in ultra thin interliner webs |
| CN102319873B (en) * | 2011-10-10 | 2013-04-10 | 广西玉林玉柴机器配件制造有限公司 | Production method for sand-lined metal mold casting cylinder body |
| CN102921902B (en) * | 2012-11-13 | 2014-12-03 | 柳州市勤友贸易有限公司 | Composite shaping technique method of iron pattern coated sand and iron type core assembly |
| CN103273006B (en) * | 2013-06-19 | 2016-01-27 | 浙江省机电设计研究院有限公司 | A kind of fitting device of Sand-Faced Metal Mould Casting brake-shoe and production method |
| CN104791401A (en) * | 2015-03-17 | 2015-07-22 | 湖北冠创铸造科技有限公司 | Iron-type coated-sand casting disc brake caliper body and producing method thereof |
| CN104858371B (en) * | 2015-04-20 | 2017-03-15 | 新泰（辽宁）精密设备有限公司 | Standard motor train unit bogie aluminium alloy sleeper beam casting system and casting method |
| CN105382206B (en) * | 2015-12-11 | 2017-06-13 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of gear case body casting mold and its forming method |
| CN105817608B (en) * | 2016-04-29 | 2019-01-18 | 南京宝泰特种材料股份有限公司 | A kind of titanium alloy smelting casting method |
| CN105880473A (en) * | 2016-05-11 | 2016-08-24 | 广西玉柴机器配件制造有限公司 | Method for producing truck suspension support through sand-lined iron mold casting |
| CN107042281A (en) * | 2016-12-20 | 2017-08-15 | 广西玉柴机器配件制造有限公司 | A kind of production method of the additional axle housing of Sand-Faced Metal Mould Casting car |
| CN106799465A (en) * | 2016-12-20 | 2017-06-06 | 广西玉柴机器配件制造有限公司 | A kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting |
| CN107745095B (en) * | 2017-09-29 | 2019-06-04 | 中国航发北京航空材料研究院 | A kind of integral wheel resin sand and metal mold composite mould and preparation method |
| CN108031788B (en) * | 2017-12-12 | 2020-08-18 | 中国兵器工业第五九研究所 | High-thermal-conductivity composite sand core for aluminum alloy casting and preparation method thereof |
-
2018
- 2018-08-01 CN CN202011494958.2A patent/CN113231602B/en active Active
- 2018-08-01 CN CN201810863979.3A patent/CN108941460B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5338578A (en) * | 1993-01-21 | 1994-08-16 | Gencorp Inc. | Method for achieving a smooth powder coated finish on a low density compression-molded plastic article |
| CN103764312A (en) * | 2011-08-31 | 2014-04-30 | 花王株式会社 | Adhesive agent composition for mold used in self-hardening molding and method for producing mold using the same |
| CN102527928A (en) * | 2012-02-29 | 2012-07-04 | 宁波市沧海新材料开发有限公司 | Alcohol-group coating for V-method casting and preparation method thereof |
| CN103008532A (en) * | 2012-12-21 | 2013-04-03 | 安徽中兴华汉机械有限公司 | Special paint for evaporative pattern aluminum alloy and manufacturing method of special paint |
Non-Patent Citations (1)
| Title |
|---|
| 酚醛树脂对铸造涂料性能和涂层组织结构的影响;杨浩秦等;《材料保护》;20160615(第06期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108941460A (en) | 2018-12-07 |
| CN113231602A (en) | 2021-08-10 |
| CN108941460B (en) | 2021-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113231602B (en) | High-performance composite casting mold for aluminum alloy casting | |
| CN105693254A (en) | Water-soluble ceramic core material and preparation method thereof | |
| CN108655332B (en) | Water-based dip-coating paint for 3D printing sand mold and preparation method thereof | |
| CN106270371B (en) | Self-hardening flame-retardant transfer coating for magnesium alloy sand mold casting and preparation method thereof | |
| CN104761266A (en) | Quick-baking anti-explosion iron runner castable and use method thereof | |
| CN1050551C (en) | Paint for spun cast pipe | |
| CN105750478B (en) | A kind of 3D sand molds printing high-strength high temperature-resistant phenolic resin and preparation method thereof | |
| CN104801659A (en) | Self-hardening transferring coating and use method thereof | |
| CN108031788A (en) | A kind of aluminium alloy casting compound sand core of high heat conduction and preparation method thereof | |
| WO2017063406A1 (en) | Aluminum alloy die-casting member defect repairing agent | |
| CN104889036A (en) | Iron-based crucible protection composite coating for refined aluminum purification | |
| CN110918869B (en) | High-temperature-resistant coating for resin sand casting and preparation method thereof | |
| CN108543917A (en) | A method of solving heat resisting steel product cavity defect | |
| CN110814273B (en) | Modified molding sand with furan resin loaded with nano ceramic | |
| CN115815520B (en) | Core paint for aluminum alloy freezing casting and preparation process thereof | |
| KR100653161B1 (en) | Pressure-casting method of semisolid Al matrix composite | |
| KR101629242B1 (en) | Manufacturing Method of ladle for transferring molten metal | |
| CN114907038B (en) | Thermal insulation coating for ductile iron part resin sand mold, and preparation method and application thereof | |
| CN1256207C (en) | Copper and copper alloy surface casting and penetrating process | |
| CN108927494A (en) | A kind of casting method of evaporative pattern | |
| CN107602137A (en) | A kind of moulding by casting converter taphole inner nozzle brick and preparation method thereof | |
| CN109967690B (en) | Precoated sand for gravity casting of thin-wall aluminum alloy casting and using method thereof | |
| CN103740884A (en) | Slag blocking plug capable of high-efficiently blocking slag | |
| CN105461325A (en) | High-alumina carbon refractory material and preparation method thereof | |
| KR102131564B1 (en) | sleeve and method of manufacturing the same |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240325 Address after: 400039 Chongqing Jiulongpo Yuzhou Road No. 33 Patentee after: Southwest Institute of technology and engineering of China Ordnance Equipment Group Country or region after: China Address before: 400039 Chongqing Jiulongpo Yuzhou Road No. 33 Patentee before: NO 59 Research Institute OF CHINA ORDNACE INDUSTRY Country or region before: China |
|
| TR01 | Transfer of patent right |