CN113441676A - Formula and preparation method of molding sand for cast iron - Google Patents
Formula and preparation method of molding sand for cast iron Download PDFInfo
- Publication number
- CN113441676A CN113441676A CN202110739505.XA CN202110739505A CN113441676A CN 113441676 A CN113441676 A CN 113441676A CN 202110739505 A CN202110739505 A CN 202110739505A CN 113441676 A CN113441676 A CN 113441676A
- Authority
- CN
- China
- Prior art keywords
- sand
- mesh
- molding
- molding sand
- 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
- 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
- B22C9/02—Sand moulds or like moulds for shaped castings
Abstract
The invention discloses a formula of molding sand for cast iron, which comprises the following components in part by weight: 12-16% of 40-mesh sand, 28-32% of 50-mesh sand, 34-38% of 70-mesh sand, 10-12% of 100-mesh sand, 4-6% of 140-mesh sand, 0.5-1.5% of sodium bentonite, 0.4-1.2% of coal powder, 0.5-0.8% of dedusting ash and 0.5-0.8% of starch. The invention discloses a formula and a manufacturing method of molding sand for cast iron, which improve the quality of the molding sand, reduce the production cost and increase the production efficiency.
Description
Technical Field
The invention relates to the field of casting, in particular to a formula and a manufacturing method of molding sand for cast iron.
Background
The 4H machine body adopts a new technology of one box with two moulds, a core setting technology of a power-assisted manipulator, an automatic electric furnace feeding and batching system, a full-automatic pouring machine technology, a machining center application technology and the like, so that the quality of a product is effectively guaranteed, the use performance and the mechanical performance can meet the social requirements, the quality of molding sand directly influences the quality of a casting, and the molding sand produced by the conventional molding sand formula and the manufacturing method is easy to have a sand inclusion phenomenon on the prepared casting, so that the casting is scrapped, and the problem which needs to be solved urgently is solved.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a formula and a manufacturing method of molding sand for cast iron, so as to solve the problems.
The technical scheme is that the formula of the molding sand for cast iron comprises the following components: 12-16% of 40-mesh sand, 28-32% of 50-mesh sand, 34-38% of 70-mesh sand, 10-12% of 100-mesh sand, 4-6% of 140-mesh sand, 0.5-1.5% of sodium bentonite, 0.4-1.2% of coal powder, 0.5-0.8% of dedusting ash and 0.5-0.8% of starch.
Furthermore, the 40-mesh sand, the 50-mesh sand, the 70-mesh sand, the 100-mesh sand and the 140-mesh sand are used sand.
The manufacturing method comprises the following steps:
A. the components are matched: weighing corresponding component materials according to a formula;
B. sand mixing: under the conditions of room temperature of-5-40 ℃ and relative humidity less than or equal to 70%, putting the material obtained in the step A into a sand mixer by adopting a sand mixer, dry-mixing for 15s, adding water, and wet-mixing for 110s to obtain molding sand;
C. and (3) detecting the molding sand: and C, detecting the molding sand obtained in the step B to determine whether the molding sand is qualified or not, wherein the qualified standard is as follows: gas forming amount is 22-30ml/g, wet compression strength is 0.10-0.18MPa, moisture is 2.7-3.1%, compaction rate is 37-43, and air permeability is 120-;
D. modeling: c, placing the molding sand qualified in the step C into a molding machine to manufacture a sand mold under the conditions that the room temperature is minus 5 to minus 40 ℃ and the relative humidity is less than or equal to 70%;
E. spraying: d, spraying a coating on the sand mold prepared in the step D;
F. and (4) checking: the quality of the coating is checked manually to see whether the coating has no peeling or warping crack.
Further, spraying is carried out in the step E in a spraying mode, the paint adopted by spraying is NM35C hardening self-drying paint, and the Baume degree of the paint is 40-45 Be.
And further, in the step F, the cavity is required to be cleaned, and floating sand and shakeout are eliminated.
The molding sand for the cast iron and the manufacturing method thereof have the beneficial effects that the formula of the molding sand for the cast iron and the manufacturing method thereof are disclosed, the phenomenon of sand inclusion of the casting is reduced between the molding sand and the casting in the using process, the quality of the molding sand is improved through the manufacturing method, the production cost is reduced, the production efficiency is increased, and the molding sand manufactured by the manufacturing method and the formula further improves the quality of the casting and the production efficiency of the casting.
Detailed Description
The technical content of the invention is explained in detail with reference to the following specific examples:
the formula of the molding sand for cast iron comprises the following components: 12-16% of 40-mesh sand, 28-32% of 50-mesh sand, 34-38% of 70-mesh sand, 10-12% of 100-mesh sand, 4-6% of 140-mesh sand, 0.5-1.5% of sodium bentonite, 0.4-1.2% of coal powder, 0.5-0.8% of dedusting ash and 0.5-0.8% of starch.
Wherein the 40-mesh sand, the 50-mesh sand, the 70-mesh sand, the 100-mesh sand and the 140-mesh sand are used sand.
Preferably, the molding sand formula is as follows: 15% of 40-mesh sand, 30% of 50-mesh sand, 36% of 70-mesh sand, 11% of 100-mesh sand, 5% of 140-mesh sand, 1% of sodium bentonite, 0.8% of coal powder, 0.6% of dedusting ash and 0.6% of starch; the effect is optimal.
The manufacturing method comprises the following steps:
A. the components are matched: weighing corresponding component materials according to a formula;
B. sand mixing: under the conditions of room temperature of-5-40 ℃ and relative humidity less than or equal to 70%, putting the material obtained in the step A into a sand mixer by adopting a sand mixer, dry-mixing for 15s, adding water, and wet-mixing for 110s to obtain molding sand;
C. and (3) detecting the molding sand: and C, detecting the molding sand obtained in the step B to determine whether the molding sand is qualified or not, wherein the qualified standard is as follows: gas forming amount is 22-30ml/g, wet compression strength is 0.10-0.18MPa, moisture is 2.7-3.1%, compaction rate is 37-43, and air permeability is 120-;
D. modeling: c, placing the molding sand qualified in the step C into a molding machine to manufacture a sand mold under the conditions that the room temperature is minus 5 to minus 40 ℃ and the relative humidity is less than or equal to 70%;
E. spraying: d, spraying paint on the part to be sprayed according to the regulation of 'eye view for spraying body modeling paint';
F. and (4) checking: the quality of the coating is checked manually to see whether the coating has no peeling or warping crack.
In this embodiment, the step E is performed by spraying, and the paint used for spraying is NM35C hardened self-drying paint, and the baume degree of the paint is 40 to 45 Be.
In this embodiment, the cavity is further cleaned in step F to remove floating sand and shakeout.
The molding sand obtains proper granularity combination through the formula and a process technical route matched with a molding sand manufacturing method, the technical principle is that the 'microscopic expansion' and 'macroscopic expansion' of the molding sand in the casting pouring process are greatly reduced, so that the phenomenon that the casting sand is clamped between the molding sand and the casting in the using process is reduced, the quality of the molding sand is improved through the manufacturing method, the production cost is reduced, the quality of the casting is further improved through the molding sand manufactured by the manufacturing method and the formula, and the production efficiency of the casting is improved.
Claims (5)
1. The formula of the molding sand for cast iron is characterized in that: the molding sand comprises the following components in percentage by weight: 12-16% of 40-mesh sand, 28-32% of 50-mesh sand, 34-38% of 70-mesh sand, 10-12% of 100-mesh sand, 4-6% of 140-mesh sand, 0.5-1.5% of sodium bentonite, 0.4-1.2% of coal powder, 0.5-0.8% of dedusting ash and 0.5-0.8% of starch.
2. The formulation of molding sand for cast iron according to claim 1, wherein: the 40-mesh sand, the 50-mesh sand, the 70-mesh sand, the 100-mesh sand and the 140-mesh sand are used sand.
3. The method for producing molding sand for cast iron according to claim 1, wherein: the method comprises the following steps:
A. the components are matched: weighing corresponding component materials according to a formula;
B. sand mixing: under the conditions of room temperature of-5-40 ℃ and relative humidity less than or equal to 70%, putting the material obtained in the step A into a sand mixer by adopting a sand mixer, dry-mixing for 15s, adding water, and wet-mixing for 110s to obtain molding sand;
C. and (3) detecting the molding sand: and C, detecting the molding sand obtained in the step B to determine whether the molding sand is qualified or not, wherein the qualified standard is as follows: gas forming amount is 22-30ml/g, wet compression strength is 0.10-0.18MPa, moisture is 2.7-3.1%, compaction rate is 37-43, and air permeability is 120-;
D. modeling: c, placing the molding sand qualified in the step C into a molding machine to manufacture a sand mold under the conditions that the room temperature is minus 5 to minus 40 ℃ and the relative humidity is less than or equal to 70%;
E. spraying: d, spraying a coating on the sand mold prepared in the step D;
F. and (4) checking: the quality of the coating is checked manually to see whether the coating has no peeling or warping crack.
4. The method for preparing a molding sand formulation for cast iron according to claim 3, wherein said step E is performed by spraying, and said paint used for spraying is NM35C hardened self-drying paint, and its Baume is 40-45 Be.
5. The method of manufacturing a molding sand formulation for cast iron according to claim 3, wherein said step F further comprises cleaning the cavity to remove floating sand and shakeout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110739505.XA CN113441676A (en) | 2021-06-30 | 2021-06-30 | Formula and preparation method of molding sand for cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110739505.XA CN113441676A (en) | 2021-06-30 | 2021-06-30 | Formula and preparation method of molding sand for cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113441676A true CN113441676A (en) | 2021-09-28 |
Family
ID=77814496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110739505.XA Pending CN113441676A (en) | 2021-06-30 | 2021-06-30 | Formula and preparation method of molding sand for cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113441676A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341589A (en) * | 2013-07-02 | 2013-10-09 | 上海圣德曼铸造有限公司 | Sand mixing process for molding clay green sand |
| CN104226889A (en) * | 2014-09-24 | 2014-12-24 | 河南省西峡汽车水泵股份有限公司 | Casting molding sand with regenerated dedusting ash and preparation technology of casting molding sand |
| CN107008850A (en) * | 2017-04-25 | 2017-08-04 | 黄石东贝铸造有限公司 | It is a kind of to prevent the molding sand of cylinder block casting scab |
| CN109530611A (en) * | 2018-12-31 | 2019-03-29 | 广西玉柴机器股份有限公司 | A method of using Foundry mixture molding sand |
-
2021
- 2021-06-30 CN CN202110739505.XA patent/CN113441676A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341589A (en) * | 2013-07-02 | 2013-10-09 | 上海圣德曼铸造有限公司 | Sand mixing process for molding clay green sand |
| CN104226889A (en) * | 2014-09-24 | 2014-12-24 | 河南省西峡汽车水泵股份有限公司 | Casting molding sand with regenerated dedusting ash and preparation technology of casting molding sand |
| CN107008850A (en) * | 2017-04-25 | 2017-08-04 | 黄石东贝铸造有限公司 | It is a kind of to prevent the molding sand of cylinder block casting scab |
| CN109530611A (en) * | 2018-12-31 | 2019-03-29 | 广西玉柴机器股份有限公司 | A method of using Foundry mixture molding sand |
Non-Patent Citations (1)
| Title |
|---|
| 河北工学院等: "铸造工艺及原理", 机械工业出版社, pages: 170 - 171 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104439074A (en) | Fusible mold precision casting method | |
| CN101185963A (en) | Vanishing mould casting technique of blast furnace cooling wall | |
| CN102366812A (en) | Preparation method for sodium silicate sand used for casting | |
| CN106825385A (en) | A kind of thermosetting resin sand mould preparation technology | |
| CN108202131A (en) | The casting technique of turbocharger housing | |
| CN114054673A (en) | 3DP preparation method of integral sand mold | |
| CN105964907A (en) | Hot-core box precoated sand casting technology of motor end cover | |
| CN113441676A (en) | Formula and preparation method of molding sand for cast iron | |
| CN103302249A (en) | Manufacturing method for mould of cast steel gear blank | |
| CN112338818A (en) | Novel inorganic sand mold binding agent for zirconium corundum fused brick sand mold and sand mold prepared from novel inorganic sand mold binding agent | |
| CN112338133A (en) | Sodium silicate curing agent and fused zirconia-corundum brick sand mold material prepared from same | |
| CN103801658B (en) | Ceramic shell manufacture method | |
| CN105964920A (en) | White die casting process for ductile iron casting | |
| CN114682729A (en) | Preparation method of precision casting silica sol shell | |
| CN103658522B (en) | Small-sized fermentation tank precision casting technology | |
| CN115255281B (en) | Casting process of high-precision casting and casting | |
| CN104550732A (en) | Water glass type copper mold casting process | |
| CN109290513A (en) | A kind of environmental protection water-glass sand shell mold process | |
| CN103551493A (en) | Resin sand for casting shape and sand core of natural gas power cylinder body | |
| CN103537630A (en) | Baking process of profile and sand core, made from resin sand, of natural gas power cylinder body | |
| CN107598072A (en) | A kind of sand formulation | |
| CN103521411A (en) | Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings | |
| CN102756076A (en) | Casting process of spindle box | |
| CN108642371A (en) | A kind of hot-forming Oil cylinder and preparation method thereof | |
| KR20190012482A (en) | Method for fabricating sand casting mold and core using inorganic binder and method for fabricating product |
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 |