CN108971427A - A kind of pouring procedure of spheroidal graphite cast-iron rear cover - Google Patents
A kind of pouring procedure of spheroidal graphite cast-iron rear cover Download PDFInfo
- Publication number
- CN108971427A CN108971427A CN201811065935.2A CN201811065935A CN108971427A CN 108971427 A CN108971427 A CN 108971427A CN 201811065935 A CN201811065935 A CN 201811065935A CN 108971427 A CN108971427 A CN 108971427A
- Authority
- CN
- China
- Prior art keywords
- riser
- rear cover
- spheroidal graphite
- poured
- graphite cast
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
-
- 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
- B22C9/088—Feeder heads
-
- 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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Abstract
The present invention relates to lid placingJi Shu fields, specifically disclose a kind of pouring procedure of spheroidal graphite cast-iron rear cover, the specific steps are as follows: make loam core using loam core sand molding；To using dipping process, to loam core graphitization powder coating, core drying processing is carried out subsequently into baking oven；External mold is poured using molding sand；Loam core is installed in external mold, is fixed with dextrin；Lid casting is carried out using resin sand, when casting, sprue gate is set in the surface of external mold, straight-through exothermic riser and precoated sand riser cylinder are set above sprue gate；The lid being poured in will be poured and carry out aptitude test.Cast gate is arranged in the surface of external mold in the pouring procedure of rear cover of the present invention, uses the teeming feeding of straight tube exothermic riser at the top of cast gate, is provided with the setting time that precoated sand riser cylinder extends molten iron in the top of exothermic riser, strengthens feeding；It is poured pushing off the slag difficulty in order to solve the problems, such as molten iron directly from riser, the molten iron for entering cast gate is filtered, the yield rate of casting is improved.
Description
Technical field
The present invention relates to lid placingJi Shu field, the pouring procedure of specifically a kind of spheroidal graphite cast-iron rear cover.
Background technique
The running gate system of casting is that the channel of metal inflow type chamber is guided in casting mold, often because running gate system is set in production
Misorient, unreasonable, the characteristic of alloy graining process in addition is counted, casting pouring process of setting interior tissue is caused to generate contracting
The casting flaws such as pine, shrinkage cavity make product that the requirement of technical standard be not achieved.In addition, casting Technology Design method and casting technique
Yield rate is directly related, i.e., with casting cost close association.
During casting, the solidification mode of spheroidal graphite cast-iron is mushy freezing, and inside is easy to appear lacking for shrinkage cavity shrinkage porosity
It falls into, since there is thread form annular channel on common lid casting two sides, when using the casting of side riser technique, gate land often contracts
Recessed, by increasing riser diameter and after height solves the problems, such as the puncture of cast(ing) surface, and it is severely deformed core cavity occur, very
There is casting fin problem caused by being broken due to loam core to runner.
Summary of the invention
The object of the present invention is to provide a kind of pouring procedure of spheroidal graphite cast-iron rear cover, by sprue gate be arranged in external mold just on
Just, then by straight tube exothermic riser and precoated sand riser cylinder the top of cast gate is set, solve the problems, such as cast(ing) surface puncture, benefit
With the heat generation characteristic of riser, extend the setting time of molten iron, strengthens feeding, improve the qualification rate of product.
In order to solve the above technical problems, specific steps are such as the present invention provides a kind of pouring procedure of spheroidal graphite cast-iron rear cover
Under:
Loam core is made using loam core sand molding, heating temperature is 200-230 DEG C, shooting pressure >=0.5MPa, shooting time
3-5S, curing time 60-90S；
, to loam core graphitization powder coating, core drying processing is carried out subsequently into baking oven, drying temperature is to using dipping process
180-220 DEG C, soaking time 0.5-1h；
External mold is poured using molding sand, heating temperature is 230-260 DEG C, shooting pressure >=0.5MPa, shooting time 3-5S, Gu
Change time 60-80S；
Loam core is installed in external mold, is fixed with dextrin；
Lid casting is carried out using resin sand, when casting, sprue gate, setting above sprue gate are set in the surface of external mold
Straight-through exothermic riser and precoated sand riser cylinder, pouring temperature are 1380-1440 DEG C；
The lid being poured in will be poured and carry out aptitude test.
Specifically, the straight tube exothermic riser is close to the top surface at sprue gate；The precoated sand riser cylinder is arranged described
The top of straight tube exothermic riser is equipped with filter layer between the top of the straight tube exothermic riser and the bottom of precoated sand riser cylinder.
Further, the filter layer be filter screen, the filter screen with a thickness of 1.5 × 1.5mm.
Further, the top of the precoated sand riser cylinder is equipped with heating agent.
Preferably, the diameter range of the straight tube exothermic riser and precoated sand riser cylinder is 70-90mm.
Specifically, the Baume degrees of the blacking is controlled in 8-10 ° of B é.
Specifically, the performance parameter of the lid is tensile strength >=500MPa, elongation percentage >=7%, hardness 170-
230HBW。
The beneficial effects of the present invention are: the pouring procedure of rear cover of the present invention pours the spheroidal graphite class rear cover wearability and resistance to punching outpoured
Hitting property is good, and fatigue resistance is strong, and cast gate is arranged in the surface of external mold, is mended at the top of cast gate using the teeming of straight tube exothermic riser
Contracting is provided with precoated sand riser cylinder in the top of exothermic riser and improves pressure, pressure increased, when extending the solidification of molten iron
Between, strengthen feeding；It is poured pushing off the slag difficulty in order to solve the problems, such as molten iron directly from riser, in straight tube exothermic riser and precoated sand
It is provided with filter screen between riser cylinder, the molten iron for entering cast gate is filtered, reduces the weight of riser molten iron, and from emitting
Sprue gate is directly entered in mouthful to be poured, and is eliminated sprue and cross gate, is improved the yield rate of casting.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative labor belongs to what the present invention protected
Range.
In one particular embodiment of the present invention, a kind of pouring procedure of spheroidal graphite cast-iron rear cover is specifically disclosed, specifically
Steps are as follows:
Loam core is made using loam core sand molding, heating temperature is 200-230 DEG C, shooting pressure >=0.5MPa, shooting time
3-5S, curing time 60-90S repair the fash all except loam core after making；
To using dipping process, to loam core graphitization powder coating, the Baume degrees of the blacking is controlled in 8-10 ° of B é；
By the loam core for applying honest material by fuel, core drying processing is carried out subsequently into baking oven, drying temperature is 180-220 DEG C, soaking time
0.5-1h；
External mold is poured using molding sand, heating temperature is 230-260 DEG C, shooting pressure >=0.5MPa, shooting time 3-5S, Gu
Change time 60-80S, pour after being poured in, all fash of removal external mold guarantee zero defect on external mold；
The fash and the floating sand on die body for removing external mold gate land, loam core is installed in external mold, is fixed with dextrin, dextrin
Note is in positioning hole；
Lid casting is carried out using resin sand, when casting, sprue gate, setting above sprue gate are set in the surface of external mold
Straight-through exothermic riser and precoated sand riser cylinder, pouring temperature are 1380-1440 DEG C；
The straight tube exothermic riser is close to the top surface at sprue gate；The precoated sand riser cylinder setting is generated heat in the straight tube
The top of riser is equipped with filter layer, the filtering between the top of the straight tube exothermic riser and the bottom of precoated sand riser cylinder
Layer is filter screen, the filter screen with a thickness of 1.5 × 1.5mm, the top of the precoated sand riser cylinder is equipped with heating agent.
After casting, casting parting line must polish smoothly completely, and cast gate must polish, and riser remnants are removed with abrasive machine, lid
Surface carries out ball blast removal surface sand grains with shot-blast apparatus, and ball blast time first time is not less than 15 minutes, and second using roller
Shot-blasting machine carries out secondary ball blast, and the time is not less than 10 minutes, guarantees cast(ing) surface cleaning, no polishing trace.
The lid being poured in will be poured and carry out aptitude test, the performance parameter of the lid is tensile strength >=500MPa, is extended
Rate >=7%, hardness 170-230HBW.
In a preferred embodiment of the present invention, the diameter range of the straight tube exothermic riser and precoated sand riser cylinder is 70-
90mm。
The beneficial effects of the present invention are: the pouring procedure of rear cover of the present invention pours the spheroidal graphite class rear cover wearability and resistance to punching outpoured
Hitting property is good, and fatigue resistance is strong, and cast gate is arranged in the surface of external mold, is mended at the top of cast gate using the teeming of straight tube exothermic riser
Contracting is provided with precoated sand riser cylinder in the top of exothermic riser and improves pressure, pressure increased, when extending the solidification of molten iron
Between, strengthen feeding；It is poured pushing off the slag difficulty in order to solve the problems, such as molten iron directly from riser, in straight tube exothermic riser and precoated sand
It is provided with filter screen between riser cylinder, the molten iron for entering cast gate is filtered, reduces the weight of riser molten iron, and from emitting
Sprue gate is directly entered in mouthful to be poured, and is eliminated sprue and cross gate, is improved the yield rate of casting.
Above disclosed be only a kind of preferred embodiment of the invention, cannot limit the present invention's certainly with this
Interest field, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (7)
1. a kind of pouring procedure of spheroidal graphite cast-iron rear cover, which is characterized in that specific step is as follows:
Loam core is made using loam core sand molding, heating temperature is 200-230 DEG C, shooting pressure >=0.5MPa, shooting time 3-5S,
Curing time 60-90S；
To using dipping process, to loam core graphitization powder coating, core drying processing, drying temperature 180- are carried out subsequently into baking oven
220 DEG C, soaking time 0.5-1h；
External mold is poured using molding sand, heating temperature is 230-260 DEG C, shooting pressure >=0.5MPa, shooting time 3-5S, when solidification
Between 60-80S；
Loam core is installed in external mold, is fixed with dextrin；
Lid casting is carried out using resin sand, when casting, sprue gate is set in the surface of external mold, setting is straight-through above sprue gate
Exothermic riser and precoated sand riser cylinder, pouring temperature are 1380-1440 DEG C；
The lid being poured in will be poured and carry out aptitude test.
2. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 1, which is characterized in that the straight tube fever emits
Mouth is close to the top surface at sprue gate；The top of the straight tube exothermic riser, the straight tube hair is arranged in the precoated sand riser cylinder
Filter layer is equipped between the top of hot riser and the bottom of precoated sand riser cylinder.
3. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 2, which is characterized in that the filter layer was
Strainer, the filter screen with a thickness of 1.5 × 1.5mm.
4. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 2, which is characterized in that the precoated sand riser
The top of cylinder is equipped with heating agent.
5. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 2, which is characterized in that the straight tube fever emits
The diameter range of mouth and precoated sand riser cylinder is 70-90mm.
6. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 1, which is characterized in that the blacking
Baume degrees control in 8-10 ° of B é.
7. a kind of pouring procedure of spheroidal graphite cast-iron rear cover according to claim 1, which is characterized in that the performance of the lid
Parameter is tensile strength >=500MPa, elongation percentage >=7%, hardness 170-230HB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811065935.2A CN108971427A (en) | 2018-09-13 | 2018-09-13 | A kind of pouring procedure of spheroidal graphite cast-iron rear cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811065935.2A CN108971427A (en) | 2018-09-13 | 2018-09-13 | A kind of pouring procedure of spheroidal graphite cast-iron rear cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108971427A true CN108971427A (en) | 2018-12-11 |
Family
ID=64545171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811065935.2A Pending CN108971427A (en) | 2018-09-13 | 2018-09-13 | A kind of pouring procedure of spheroidal graphite cast-iron rear cover |
Country Status (1)
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|---|---|
| CN (1) | CN108971427A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105845A (en) * | 1986-07-15 | 1987-02-25 | 王永安 | Novel casting head and preparation method thereof |
| EP1900458A1 (en) * | 2006-09-15 | 2008-03-19 | Calamari S.p.A. | Casting apparatus for metal materials |
| CN203470826U (en) * | 2013-03-05 | 2014-03-12 | 南通华东油压科技有限公司 | Special dead head used in manufacturing technique of mobile machinery bracket cast |
| CN103920857A (en) * | 2014-05-06 | 2014-07-16 | 南通华东油压科技有限公司 | Casting method of three-way valve body of agricultural combined machine |
| CN104043787A (en) * | 2014-06-24 | 2014-09-17 | 南通华东油压科技有限公司 | Solenoid valve casting mold and casting technique |
| CN104043786A (en) * | 2014-06-24 | 2014-09-17 | 南通华东油压科技有限公司 | Casting process of hydraulic main valve casting of 20-ton excavator |
-
2018
- 2018-09-13 CN CN201811065935.2A patent/CN108971427A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105845A (en) * | 1986-07-15 | 1987-02-25 | 王永安 | Novel casting head and preparation method thereof |
| EP1900458A1 (en) * | 2006-09-15 | 2008-03-19 | Calamari S.p.A. | Casting apparatus for metal materials |
| CN203470826U (en) * | 2013-03-05 | 2014-03-12 | 南通华东油压科技有限公司 | Special dead head used in manufacturing technique of mobile machinery bracket cast |
| CN103920857A (en) * | 2014-05-06 | 2014-07-16 | 南通华东油压科技有限公司 | Casting method of three-way valve body of agricultural combined machine |
| CN104043787A (en) * | 2014-06-24 | 2014-09-17 | 南通华东油压科技有限公司 | Solenoid valve casting mold and casting technique |
| CN104043786A (en) * | 2014-06-24 | 2014-09-17 | 南通华东油压科技有限公司 | Casting process of hydraulic main valve casting of 20-ton excavator |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181211 |
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| RJ01 | Rejection of invention patent application after publication |