CN110732657A - ball-milling cast iron feeding method - Google Patents
ball-milling cast iron feeding method Download PDFInfo
- Publication number
- CN110732657A CN110732657A CN201910937328.9A CN201910937328A CN110732657A CN 110732657 A CN110732657 A CN 110732657A CN 201910937328 A CN201910937328 A CN 201910937328A CN 110732657 A CN110732657 A CN 110732657A
- Authority
- CN
- China
- Prior art keywords
- casting
- expansion
- riser
- shrinkage
- cast iron
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D3/00—Pig or like casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses an nodular cast iron feeding method which is characterized by comprising the following steps of S1 a cast iron pouring preparation step, S2 a cast iron pouring step, S21 controls the temperature of the cross section of a casting, different temperature gradients are arranged on the cross section of the casting and the surface of a casting mold, different cooling speeds are achieved in different areas, graphitization and expansion of a solidification area are counteracted by contraction of an adjacent solidification area, S22 controls the rigidity of the casting mold, different casting mold rigidities are arranged in a matched mode with the temperature gradients arranged in S21, the temperature gradients are matched with expansion pressure to serve as a self-feeding driving force, the expansion utilization rate is improved, and S3 a cast iron inoculation step.
Description
Technical Field
The invention relates to a feeding method of nodular cast irons.
Background
Because of the complexity of the formation of shrinkage cavities and shrinkage porosity of the nodular cast iron, the forming mechanism and the feeding method of the shrinkage cavities and shrinkage porosity are not uniform , the traditional thick and large nodular cast iron is produced by adopting a die and a special tool, the rigidity of the special tool and a casting mold can lead graphitization expansion to realize self feeding, and the shrinkage porosity problem in the casting solidification process can be solved by adopting the modes of chilling of a chilling block and sequential solidification of riser feeding, and the like.
The invention aims to prepare a self-feeding nodular cast iron feeding method for castings in different areas.
Disclosure of Invention
The present invention aims to provide kinds of nodular cast iron feeding method to solve the said problems.
In order to achieve the purpose, the invention is realized by the following technical scheme that the ball-milling cast iron feeding method comprises the following steps;
s1: preparation stage of cast iron pouring:
s11 controlling the solidification time of the riser: the casting with riser solidification time longer than that of the riser neck and the riser neck solidification time longer than that of the casting, liquid body shrinkage of the casting is supplied by the riser, the casting enters an eutectic expansion period to extrude redundant molten metal back to the riser, and the shrinkage porosity defect at the final stage of solidification is eliminated by means of the gravity of the molten metal;
s12 controlling riser pressure: setting the size of the riser neck to freeze the riser neck before eutectic expansion is finished so as to control the backfill degree, establishing proper internal pressure in the casting by utilizing partial eutectic expansion to offset the secondary shrinkage defect, and casting from the maximum pressure of the minimum pressure casting expansion without the secondary shrinkage defect so as to obtain the casting without shrinkage cavity and shrinkage porosity and avoid expansion deformation;
s2: and (3) casting iron:
s21 controlling the temperature of the cross section of the casting: different temperature gradients are set at the cross section of the casting and the surface of the casting mold, so that different areas have different cooling speeds; the graphitized expansion of the pre-solidification region counteracts the ongoing shrinkage of the adjacent post-solidification region;
s22 controlling the rigidity of the mould: the upper and lower different casting mold rigidities are set in cooperation with the temperature gradient set in the S21, and the expansion pressure is used as a counterforce to become a self-feeding driving force in cooperation with the temperature gradient, so that the expansion utilization rate is improved;
s3: and (3) a cast iron inoculation stage:
before spheroidization, a barium-or antimony-containing compound ferrosilicon inoculant is added to delay inoculation decay time and reduce graphite shrinkage cavity and shrinkage porosity.
Further , a dead head volume is set to control the degree of backfill in step S12.
And , in the step S3, the addition amount of the inoculant is 1.5-1.8% of the mass of the cast iron, and the granularity of the inoculant is 15-30 mm.
The invention has the beneficial effects that: the nodular cast iron feeding method is based on the solidification principle of nodular cast iron, and under the condition that a feeding channel exists in cast iron pouring, different temperature gradients are set on the cross section of a casting to be matched with different rigidities of the surface of a casting mold, so that self-feeding of different areas of the casting is realized.
Detailed Description
Specific embodiment 1: ductile cast iron feeding method, comprising the steps of;
s1: preparation stage of cast iron pouring:
s11 controlling the solidification time of the riser: the casting with riser solidification time longer than that of the riser neck and the riser neck solidification time longer than that of the casting, liquid body shrinkage of the casting is supplied by the riser, the casting enters an eutectic expansion period to extrude redundant molten metal back to the riser, and the shrinkage porosity defect at the final stage of solidification is eliminated by means of the gravity of the molten metal;
s12 controlling riser pressure: setting the size of the riser neck to freeze the riser neck before eutectic expansion is finished so as to control the backfill degree, establishing proper internal pressure in the casting by utilizing partial eutectic expansion to offset the secondary shrinkage defect, and casting from the maximum pressure of the minimum pressure casting expansion without the secondary shrinkage defect so as to obtain the casting without shrinkage cavity and shrinkage porosity and avoid expansion deformation;
s2: and (3) casting iron:
s21 controlling the temperature of the cross section of the casting: different temperature gradients are set at the cross section of the casting and the surface of the casting mold, so that different areas have different cooling speeds; the graphitized expansion of the pre-solidification region counteracts the ongoing shrinkage of the adjacent post-solidification region;
s22 controlling the rigidity of the mould: the upper and lower different casting mold rigidities are set in cooperation with the temperature gradient set in the S21, and the expansion pressure is used as a counterforce to become a self-feeding driving force in cooperation with the temperature gradient, so that the expansion utilization rate is improved;
s3: and (3) a cast iron inoculation stage:
before spheroidization reaction, adding a barium-containing composite ferrosilicon inoculant, wherein the addition amount of the inoculant is 1.5-1.8 percent of the mass of cast iron, and the granularity of the inoculant is 15-30 mm; delay inoculation decay time and reduce graphite shrinkage cavity and shrinkage porosity.
Specific embodiment 2: A method for feeding a ball-milled cast iron, comprising the steps of;
s1: preparation stage of cast iron pouring:
s11 controlling the solidification time of the riser: the casting with riser solidification time longer than that of the riser neck and the riser neck solidification time longer than that of the casting, liquid body shrinkage of the casting is supplied by the riser, the casting enters an eutectic expansion period to extrude redundant molten metal back to the riser, and the shrinkage porosity defect at the final stage of solidification is eliminated by means of the gravity of the molten metal;
s12 controlling riser pressure: setting the size of the riser neck to freeze the riser neck before eutectic expansion is finished so as to control the backfill degree, establishing proper internal pressure in the casting by utilizing partial eutectic expansion to offset the secondary shrinkage defect, and casting from the maximum pressure of the minimum pressure casting expansion without the secondary shrinkage defect so as to obtain the casting without shrinkage cavity and shrinkage porosity and avoid expansion deformation;
s2: and (3) casting iron:
s21 controlling the temperature of the cross section of the casting: different temperature gradients are set at the cross section of the casting and the surface of the casting mold, so that different areas have different cooling speeds; the graphitized expansion of the pre-solidification region counteracts the ongoing shrinkage of the adjacent post-solidification region;
s22 controlling the rigidity of the mould: the upper and lower different casting mold rigidities are set in cooperation with the temperature gradient set in the S21, and the expansion pressure is used as a counterforce to become a self-feeding driving force in cooperation with the temperature gradient, so that the expansion utilization rate is improved;
s3: and (3) a cast iron inoculation stage:
before spheroidization reaction, adding an antimony-containing composite ferrosilicon inoculant, wherein the addition amount of the inoculant is 1.5-1.8 percent of the mass of cast iron, and the granularity of the inoculant is 15-30 mm; delay inoculation decay time and reduce graphite shrinkage cavity and shrinkage porosity.
Specific embodiment 3: ductile cast iron feeding method, comprising the steps of;
s1: preparation stage of cast iron pouring:
s11 controlling the solidification time of the riser: the casting with riser solidification time longer than that of the riser neck and the riser neck solidification time longer than that of the casting, liquid body shrinkage of the casting is supplied by the riser, the casting enters an eutectic expansion period to extrude redundant molten metal back to the riser, and the shrinkage porosity defect at the final stage of solidification is eliminated by means of the gravity of the molten metal;
s12 controlling riser pressure: setting the volume of a dead head, freezing the dead head neck before eutectic expansion is finished to control the backfill degree, establishing proper internal pressure in the casting by utilizing partial eutectic expansion to offset the secondary shrinkage defect, and pouring the internal pressure between the maximum pressures of the minimum pressure casting mold expansion without generating the secondary shrinkage defect, thereby obtaining the casting without shrinkage cavity and shrinkage porosity and avoiding expansion deformation;
s2: and (3) casting iron:
s21 controlling the temperature of the cross section of the casting: different temperature gradients are set at the cross section of the casting and the surface of the casting mold, so that different areas have different cooling speeds; the graphitized expansion of the pre-solidification region counteracts the ongoing shrinkage of the adjacent post-solidification region;
s22 controlling the rigidity of the mould: the upper and lower different casting mold rigidities are set in cooperation with the temperature gradient set in the S21, and the expansion pressure is used as a counterforce to become a self-feeding driving force in cooperation with the temperature gradient, so that the expansion utilization rate is improved;
s3: and (3) a cast iron inoculation stage:
before spheroidization reaction, adding an antimony-containing composite ferrosilicon inoculant, wherein the addition amount of the inoculant is 1.5-1.8 percent of the mass of cast iron, and the granularity of the inoculant is 15-30 mm; delay inoculation decay time and reduce graphite shrinkage cavity and shrinkage porosity.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (3)
1, ball-milling cast iron feeding method, which is characterized by comprising the following steps;
s1: preparation stage of cast iron pouring:
s11 controlling the solidification time of the riser: the casting with riser solidification time longer than that of the riser neck and the riser neck solidification time longer than that of the casting, liquid body shrinkage of the casting is supplied by the riser, the casting enters an eutectic expansion period to extrude redundant molten metal back to the riser, and the shrinkage porosity defect at the final stage of solidification is eliminated by means of the gravity of the molten metal;
s12 controlling riser pressure: setting the size of the riser neck to freeze the riser neck before eutectic expansion is finished so as to control the backfill degree, establishing proper internal pressure in the casting by utilizing partial eutectic expansion to offset the secondary shrinkage defect, and casting from the maximum pressure of the minimum pressure casting expansion without the secondary shrinkage defect so as to obtain the casting without shrinkage cavity and shrinkage porosity and avoid expansion deformation;
s2: and (3) casting iron:
s21 controlling the temperature of the cross section of the casting: different temperature gradients are set at the cross section of the casting and the surface of the casting mold, so that different areas have different cooling speeds; the graphitized expansion of the pre-solidification region counteracts the ongoing shrinkage of the adjacent post-solidification region;
s22 controlling the rigidity of the mould: the upper and lower different casting mold rigidities are set in cooperation with the temperature gradient set in the S21, and the expansion pressure is used as a counterforce to become a self-feeding driving force in cooperation with the temperature gradient, so that the expansion utilization rate is improved;
s3: and (3) a cast iron inoculation stage:
before spheroidization, a barium-or antimony-containing compound ferrosilicon inoculant is added to delay inoculation decay time and reduce graphite shrinkage cavity and shrinkage porosity.
2. The ductile iron feeding method of claim 1, wherein a dead head volume is set to control the degree of backfill in step S12.
3. The ductile iron feeding method of claim 1, wherein the inoculant is added in an amount of 1.5-1.8 wt.% based on the cast iron and the inoculant has a particle size of 15-30mm in step S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937328.9A CN110732657A (en) | 2019-09-30 | 2019-09-30 | ball-milling cast iron feeding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937328.9A CN110732657A (en) | 2019-09-30 | 2019-09-30 | ball-milling cast iron feeding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110732657A true CN110732657A (en) | 2020-01-31 |
Family
ID=69269871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910937328.9A Pending CN110732657A (en) | 2019-09-30 | 2019-09-30 | ball-milling cast iron feeding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110732657A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289705A (en) * | 2021-12-31 | 2022-04-08 | 江苏永瀚特种合金技术股份有限公司 | Process method for reducing shrinkage porosity in gravity casting process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5489931A (en) * | 1977-12-27 | 1979-07-17 | Nippon Steel Corp | Method of making steel ingot using gas agitation of slag |
| CN102371345A (en) * | 2010-08-23 | 2012-03-14 | 上海华新合金有限公司 | Method for casting ductile iron casting of air-conditioning compressor |
| CN103352161A (en) * | 2013-07-23 | 2013-10-16 | 四川省祥业机械铸造有限公司 | Ductile iron casting and casting process thereof |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN109277526A (en) * | 2018-11-07 | 2019-01-29 | 阜新力达钢铁铸造有限公司 | The casting method of heavy-section ductile iron die-casting machine |
-
2019
- 2019-09-30 CN CN201910937328.9A patent/CN110732657A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5489931A (en) * | 1977-12-27 | 1979-07-17 | Nippon Steel Corp | Method of making steel ingot using gas agitation of slag |
| CN102371345A (en) * | 2010-08-23 | 2012-03-14 | 上海华新合金有限公司 | Method for casting ductile iron casting of air-conditioning compressor |
| CN103352161A (en) * | 2013-07-23 | 2013-10-16 | 四川省祥业机械铸造有限公司 | Ductile iron casting and casting process thereof |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN109277526A (en) * | 2018-11-07 | 2019-01-29 | 阜新力达钢铁铸造有限公司 | The casting method of heavy-section ductile iron die-casting machine |
Non-Patent Citations (1)
| Title |
|---|
| 洪恒发: "基于球磨铸铁凝固原理的补缩方法", 《铸造》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114289705A (en) * | 2021-12-31 | 2022-04-08 | 江苏永瀚特种合金技术股份有限公司 | Process method for reducing shrinkage porosity in gravity casting process |
| CN114289705B (en) * | 2021-12-31 | 2023-11-03 | 江苏永瀚特种合金技术股份有限公司 | Process method for reducing shrinkage porosity in gravity casting process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102876962B (en) | Method for manufacturing bainite ductile cast iron piston ring | |
| CN111910118B (en) | Method for forming nodular cast iron flywheel for high-power diesel engine | |
| CN201596759U (en) | Double-crucible low pressure casting machine | |
| CN102994784A (en) | Method for phase structure in refined hypereutectic aluminum-silicon alloy by strong magnetic field composited with alterant | |
| JP4718685B2 (en) | Method and device for chill molding | |
| CN103302264A (en) | High-density die-casting molding method for an aluminium alloy cast of hydraulic brake pump casing body of an automobile | |
| CN102019351B (en) | Method for producing spheroidal graphite iron casting with high strength and thick and uniform wall | |
| CN110732657A (en) | ball-milling cast iron feeding method | |
| US1294209A (en) | Process for producing solid castings and their products. | |
| CN1069072C (en) | Manufacture of wear resisting product | |
| CN110551929A (en) | automobile part die-casting production process | |
| CN105382240A (en) | Precision casting process for thin-wall aluminum alloy casting | |
| CN110315034B (en) | Casting system and casting method of cylinder barrel | |
| CN109513890B (en) | Preparation method of hollow cast iron pipe with A-type graphite structure | |
| CN104249142A (en) | Pressure casting method of purified homogenized compacted fine-grained large steel blank | |
| CN1507970A (en) | Magnesium alloy hub pressure casting apparatus and method thereof | |
| CN108031796A (en) | The investment casting production technology of spheroidal graphite cast-iron | |
| RU2335377C1 (en) | Method of precise ingots production in ceramic moulds with pressurised crystallisation | |
| CN108453231B (en) | Shape-following cold control mold and using method thereof | |
| CN111230045A (en) | Casting process of full mold casting type tire mold casting | |
| CN105798272A (en) | Automobile mold casting cast by compounding alloy gray iron and ordinary gray iron, gating system and casting method | |
| CN102049476A (en) | Technique method for inoculating and strengthening cylinder liner | |
| CN109763075A (en) | A kind of S50C medium carbon steel and its smelting process | |
| Kanno | Effect of pouring temperature, composition, mould strength and metal flow resistance on shrinkage cavities in spheroidal graphite cast iron | |
| CN204817914U (en) | Casting mould of gluing first board is penetrated to die casting machine |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200131 |
|
| RJ01 | Rejection of invention patent application after publication |