CN108273963A - A kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting - Google Patents
A kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting Download PDFInfo
- Publication number
- CN108273963A CN108273963A CN201810062987.8A CN201810062987A CN108273963A CN 108273963 A CN108273963 A CN 108273963A CN 201810062987 A CN201810062987 A CN 201810062987A CN 108273963 A CN108273963 A CN 108273963A
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- China
- Prior art keywords
- casting
- chill
- evaporative pattern
- big wall
- apperance
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Classifications
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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
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention provides a kind of casting methods for preventing from generating shrinkage defect at the thick big wall of casting, the casting method uses lost foam casting process, moulding process uses negative pressure of vacuum formative method, before negative pressure of vacuum moulding being carried out to evaporative pattern, the chill of lightweight chill material is placed on to the corresponding position of evaporative pattern apperance by casting technique requirement, and chill and evaporative pattern apperance are bonded together.The present invention overcomes the chills that existing formative method uses to fix, it is easy to move during moulding jolt ramming, positioning leads to not to carrying out feeding at the big wall of the thickness of casting, and the chill that is used in existing formative method heavier the problem of being easy to cause damage, deformation to apperance, provide a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting, using the process of " lightweight chill material+assemble chill in advance ", loose, the Shrinkage Problem of heavy section casting in casting process are efficiently solved.
Description
Technical field
The present invention relates to a kind of vacuum negative-pressure los mould casting technical fields, and in particular to one kind prevents at the thick big wall of casting
Generate the casting method of shrinkage defect.
Background technology
Lost foam casting is to replace mold to be cast with foam mould, and apperance is not taken out, direct casting of molten metal, gold
Belong to liquid to burn mistake apperance and obtain a kind of casting method of ideal casting.This foundry engieering is original with the disappearance mold materials of low-density
Material, such as EPS/STMMA, surface coating paint establish after intensity filling moulding again.
Negative pressure of vacuum formative method refers to burying case moulding using dry sand, so that dry sand is built around apperance using sealing vacuum
A kind of Green foundry method of moulding by casting after vertical intensity.The apperance surface of this casting method can not holding movable technique letter
Breath, such as chill, riser etc..Negative-pressure los mould casting method is dry moulding first, and sand mold is defeated and dispersed state before cast, cold
Iron, riser etc. can not ensure to be bonded completely with apperance, there is dry sand filling between apperance；Secondly negative-pressure los mould casting method is
Using jolt ramming platform consolidation dry sand, chill, riser etc. can shift during jolt ramming, therefore chill, riser Quench feeding effect
Inconsistent with technological design, eventually leading to casting quality can not ensure, it may appear that the defects of loose, shrinkage porosite.
Invention content
The present invention overcomes the chills that existing formative method uses to fix, and is easy to move during moulding jolt ramming
Dynamic, positioning leads to not heavier easy to carrying out the chill used in feeding and existing formative method at the big wall of the thickness of casting
The problem of causing damage, deformation to apperance provides a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting, adopts
With the process of " lightweight chill material+assemble chill in advance ", loose, the shrinkage cavity of heavy section casting in casting process are efficiently solved
Problem.
The technical scheme is that：A kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting, the casting
Method uses lost foam casting process, moulding process to use negative pressure of vacuum formative method, and negative pressure of vacuum is carried out to the evaporative pattern
Before moulding, the chill of lightweight chill material is placed on to the corresponding position of evaporative pattern apperance by casting technique requirement, and will be cold
Iron bonds together with evaporative pattern apperance.
Further, when being abnormally-structured at the thick big wall of casting, the chill of lightweight chill material is designed as tying with special-shaped
The structure that structure coordinates with the shape, the chill of lightweight chill material use heat with after the abnormally-structured assembling of corresponding evaporative pattern apperance
Melten gel is Nian Jie with the gap of evaporative pattern apperance contact position by chill, after hot melt adhesive hardening, is applied successively to evaporative pattern apperance
It applies, dry, moulding.Processing can graphite chilling block cannot be complete with evaporative pattern apperance after the application to avoid these complicated shapes in this way
Fitting, influences chill effect.Described is abnormally-structured for nonstandard structures such as jaw, nonstandard hole, slots.
Further, when being planar structure at the thick big wall of casting, the chill of lightweight chill material is designed as rectangle agllutination
Rectangular block chill after evaporative pattern apperance is applied, dried successively, is placed on evaporative pattern apperance by structure by casting technique requirement
The big wall planar structure of thickness on, and using sand mold bonding agent bonding chill and evaporative pattern apperance, made after the hardening of sand mold bonding agent
Type.
Further, lightweight chill material is graphite.
Lightweight chill material will have that light weight, heat capacity ratio be big, the characteristics such as inexpensive, easily molded, meet the material of requirements above
Expect there is chrome ore sand mixture, metal powder+resin sand mixture, graphite etc., but it is optimal with graphite.Graphite chilling block and cast iron chill
Physical property compares, and essence is that the physical property of graphite and metallic iron compares, refer to table 1 it is found that the density of graphite chilling block only
There is the 1/4 of cast iron chill, and its heat conduction and heat storage capacity are 3~4 times of cast iron chill, fusing point is significantly larger than the fusing point of iron,
Expanded by heating is also smaller so that the two moulding, make core process, casting cooling process have with the result etc. that casting cools down
Different performances.
1. cast iron chill of table is compared with graphite chilling block physical property
| Index | Cast iron chill | Graphite chilling block |
| Density/(g/cm3) | 7.5 | 1.65~1.85 |
| Thermal coefficient/(/m. DEG C) | 48 | 115~129 |
| Specific heat capacity/(J/kg. DEG C) | 444 | 710~1510 |
| Fusing point/DEG C | 1535 | 3850 |
| Coefficient of thermal expansion/(10E-6/ DEG C) | 10 | ＜ 6 |
The technique effect of the technical program is：Graphite is chosen as chill, can reach light weight, heat capacity ratio it is big, it is low at
Originally, the characteristics such as easily molded；Using the process of " lightweight chill material+assemble chill in advance ", casting process is efficiently solved
Loose, the Shrinkage Problem of middle heavy section casting.
Description of the drawings
Fig. 1 is the schematic diagram for jaw structure at the thick big wall of specific embodiment medium casting；
Fig. 2 is jaw assembly graphite chilling block structure in specific embodiment；
Fig. 3 is the structural schematic diagram of jaw graphite chilling block assembling mode in specific embodiment；
The casting structure schematic diagram that Fig. 4 is specific embodiment medium casting thick big wall when being planar structure；
Fig. 5 is specific embodiment medium casting thick big wall when being planar structure, the structural schematic diagram of the graphite chilling block used；
Fig. 6 is specific embodiment medium casting thick big wall when being planar structure, after graphite chilling block is Nian Jie with evaporative pattern apperance
Structural schematic diagram.
In figure, 1- jaw structures, 2- jaw graphite chilling blocks, 3- hot melt adhesive, 4- planar structures, 5- rectangle graphite chilling blocks, 6-
Sand mold bonding agent.
Specific implementation mode
In order to which the present invention is described further, the present invention is elaborated below with reference to embodiment.
Embodiment one
As shown in Figure 1 to Figure 3, a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting, the casting method
Using lost foam casting process, moulding process uses negative pressure of vacuum formative method, will before carrying out negative pressure of vacuum moulding to evaporative pattern
The chill of lightweight chill material is placed on the corresponding position of evaporative pattern apperance by casting technique requirement, and by chill and evaporative pattern
Apperance bonds together, and lightweight chill material is graphite.
When being jaw structure 1 at the thick big wall of casting, graphite is chosen as lightweight chill material, is designed to and jaw knot
2 structure of jaw graphite chilling block that structure 1 coordinates with the shape, jaw graphite chilling block 2 are assembled with the jaw structure 1 of corresponding evaporative pattern apperance
Afterwards, using hot melt adhesive 3 that jaw graphite chilling block 2 is Nian Jie with the gap of evaporative pattern apperance contact position, it is right after the hardening of hot melt adhesive 3
Evaporative pattern apperance applied, dried successively, moulding.
Embodiment two
As shown in Figures 4 to 6, it when being planar structure 4 at the thick big wall of casting, chooses graphite and is used as lightweight chill material, by
It is designed as 5 structure of rectangle graphite chilling block, after evaporative pattern apperance is applied, dried successively, by rectangle graphite chilling block 5 by casting
It makes technological requirement to be placed in the thickness wall planar structure 4 greatly of evaporative pattern apperance, and is bonded chill using sand mold bonding agent 6 and disappears
Mould apperance, the moulding after the hardening of sand mold bonding agent 6.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces；And these modifications or replacements, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (4)
1. a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting, the casting method use lost foam casting work
Skill, moulding process use negative pressure of vacuum formative method, which is characterized in that, will before carrying out negative pressure of vacuum moulding to the evaporative pattern
The chill of lightweight chill material is placed on the corresponding position of evaporative pattern apperance by casting technique requirement, and by chill and evaporative pattern
Apperance bonds together.
2. a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting according to claim 1, feature exist
When being abnormally-structured at the thick big wall of, casting, the chill of the lightweight chill material is designed as and abnormally-structured profile-followed cooperation
Structure, the chill of lightweight chill material with after the abnormally-structured assembling of corresponding evaporative pattern apperance, using hot melt adhesive by chill
It is Nian Jie with the gap of evaporative pattern apperance contact position, after hot melt adhesive hardening, evaporative pattern apperance is applied successively, dried, is made
Type.
3. a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting according to claim 1, feature exist
When being planar structure at the thick big wall of, casting, the chill of the lightweight chill material is designed as rectangular block architecture, to evaporative pattern
Apperance applied successively, dry after, the big wall of thickness that rectangular block chill is placed on to evaporative pattern apperance by casting technique requirement is put down
In the structure of face, and using sand mold bonding agent bonding chill and evaporative pattern apperance, the moulding after the hardening of sand mold bonding agent.
4. a kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting according to claim 1, feature exist
In the lightweight chill material is graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810062987.8A CN108273963B (en) | 2018-01-23 | 2018-01-23 | Casting method for preventing shrinkage porosity defect at thick and large wall of casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810062987.8A CN108273963B (en) | 2018-01-23 | 2018-01-23 | Casting method for preventing shrinkage porosity defect at thick and large wall of casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108273963A true CN108273963A (en) | 2018-07-13 |
| CN108273963B CN108273963B (en) | 2020-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810062987.8A Active CN108273963B (en) | 2018-01-23 | 2018-01-23 | Casting method for preventing shrinkage porosity defect at thick and large wall of casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625066A (en) * | 2019-10-29 | 2019-12-31 | 湖北星源科技有限公司 | Preparation method of balance shaft bracket casting |
| CN113042686A (en) * | 2019-12-27 | 2021-06-29 | 南通虹冈铸钢有限公司 | Processing method for preventing defects of guide post hole of automobile stamping die and direct chill |
| CN113333673A (en) * | 2021-05-21 | 2021-09-03 | 中国航发哈尔滨东安发动机有限公司 | Quick preparation method of resin sand casting mold |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0230360A (en) * | 1988-07-16 | 1990-01-31 | Nippon Piston Ring Co Ltd | Production of cast iron product |
| CN201922016U (en) * | 2010-12-10 | 2011-08-10 | 四川简阳海特有限公司 | Natural-shape graphite chilling block |
| CN103506576A (en) * | 2013-09-18 | 2014-01-15 | 宁夏共享集团有限责任公司 | Production method for preventing evaporative pattern casting deformation |
| CN103691885A (en) * | 2013-12-05 | 2014-04-02 | 山东省源通机械股份有限公司 | Method for installing chilling block or sand coating iron mould |
| CN105537522A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Technological method of using internal chill for expendable pattern negative pressure casting |
| CN205270819U (en) * | 2015-12-10 | 2016-06-01 | 宁夏共享能源有限公司 | Graphite chill for casting process |
| CN205834117U (en) * | 2016-06-30 | 2016-12-28 | 天津虹冈铸钢有限公司 | A kind of die reducing casting shrinking hole |
| CN107297486A (en) * | 2017-06-30 | 2017-10-27 | 共享装备股份有限公司 | A kind of set-up mode every sand cooling iron |
| CN107570669A (en) * | 2017-08-30 | 2018-01-12 | 信阳同合车轮有限公司 | Railway cast steel wheel evaporative pattern graphite Quench gravity foundry technology |
-
2018
- 2018-01-23 CN CN201810062987.8A patent/CN108273963B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0230360A (en) * | 1988-07-16 | 1990-01-31 | Nippon Piston Ring Co Ltd | Production of cast iron product |
| CN201922016U (en) * | 2010-12-10 | 2011-08-10 | 四川简阳海特有限公司 | Natural-shape graphite chilling block |
| CN103506576A (en) * | 2013-09-18 | 2014-01-15 | 宁夏共享集团有限责任公司 | Production method for preventing evaporative pattern casting deformation |
| CN103691885A (en) * | 2013-12-05 | 2014-04-02 | 山东省源通机械股份有限公司 | Method for installing chilling block or sand coating iron mould |
| CN205270819U (en) * | 2015-12-10 | 2016-06-01 | 宁夏共享能源有限公司 | Graphite chill for casting process |
| CN105537522A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Technological method of using internal chill for expendable pattern negative pressure casting |
| CN205834117U (en) * | 2016-06-30 | 2016-12-28 | 天津虹冈铸钢有限公司 | A kind of die reducing casting shrinking hole |
| CN107297486A (en) * | 2017-06-30 | 2017-10-27 | 共享装备股份有限公司 | A kind of set-up mode every sand cooling iron |
| CN107570669A (en) * | 2017-08-30 | 2018-01-12 | 信阳同合车轮有限公司 | Railway cast steel wheel evaporative pattern graphite Quench gravity foundry technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625066A (en) * | 2019-10-29 | 2019-12-31 | 湖北星源科技有限公司 | Preparation method of balance shaft bracket casting |
| CN113042686A (en) * | 2019-12-27 | 2021-06-29 | 南通虹冈铸钢有限公司 | Processing method for preventing defects of guide post hole of automobile stamping die and direct chill |
| CN113333673A (en) * | 2021-05-21 | 2021-09-03 | 中国航发哈尔滨东安发动机有限公司 | Quick preparation method of resin sand casting mold |
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| Publication number | Publication date |
|---|---|
| CN108273963B (en) | 2020-03-10 |
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