CN111347006A - Graphite powder composition for casting and method for sand casting by using same - Google Patents
Graphite powder composition for casting and method for sand casting by using same Download PDFInfo
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- CN111347006A CN111347006A CN202010387547.7A CN202010387547A CN111347006A CN 111347006 A CN111347006 A CN 111347006A CN 202010387547 A CN202010387547 A CN 202010387547A CN 111347006 A CN111347006 A CN 111347006A
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- graphite powder
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- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/181—Cements, oxides or clays
-
- 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
A graphite powder composition for casting and a method for sand casting by using the same. The graphite powder composition for casting comprises, by weight, 50-70 parts of graphite powder, 20-40 parts of a ceramic base material and 5-15 parts of a ceramic adhesive, wherein the particle size of the graphite powder is 80-120 meshes, and the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin with the particle size of 300-600 meshes according to the mass ratio of 1:1: 1. The graphite powder is used as the molding sand for sand casting, the excellent physical and chemical properties of the graphite powder are fully utilized, the graphite powder has high temperature resistance, high electric and thermal conductivity, high lubricity, high chemical stability, high toughness, high plasticity and high shock resistance, and the performance of the graphite powder in all aspects can well make up the defects of the molding sand in the traditional sand casting. The graphite powder waste is applied to sand casting, so that the graphite powder waste is repeatedly and effectively utilized, and the quality of the traditional sand casting process is optimized and improved.
Description
Technical Field
The invention relates to the technical field of graphite processing, in particular to a graphite powder composition for casting and a method for sand casting by using the same.
Background
The graphite waste mainly has three sources, one is the graphite waste generated by machining, the graphite waste is mainly graphite powder, a large amount of machining graphite waste is generated every day in machining enterprises of graphite raw materials, the existing treatment mode is that the graphite waste is accumulated and then sold to waste buyers in a form of machining waste, and compared with the purchase of the graphite raw materials, the cost is extremely low; the second is leftover materials which can not be reused and are left in the machining process, the part of leftover materials are mainly blocky, machining enterprises of graphite raw materials can generate a certain amount of leftover materials every day, the amount of the leftover materials is not larger than that of graphite powder, the quantity of the leftover materials after being stocked is extremely considerable, and the part of waste materials can be sold in the form of waste materials due to the fact that the part of waste materials can not be used, and the price is low; the third is the negative electrode material existing in the lithium battery, the material is graphite and is powdery, the amount of the negative electrode material of graphite powder treated from the waste battery in one day in China is also huge, but the part of graphite powder can not be effectively utilized, and basically all the graphite powder is used as waste materials to be sold and recycled. The inability of graphite waste to be effectively recycled has become a norm in the industry, which results in significant waste of raw materials to some extent. In view of this, there is a need to develop a way to effectively utilize graphite waste. After a large amount of existing industries are collected and researched, applicants find that in the field of sand casting, used sand molds are powdery and can be effectively combined with graphite powder waste, and meanwhile, applicants find that molding sand used in existing sand casting is not low in cost and doped with resin, dense smoke can be generated during high-temperature casting, the basic reason is that resin used for molding volatilizes at high temperature, certain waste gas and waste smoke are generated, pollution is caused, and the reuse rate of traditional molding sand is not high, so that the applicants research a method for replacing traditional molding sand with graphite powder waste and applying the graphite powder waste to traditional sand casting.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to provide a graphite powder composition that can be used in sand casting to effectively replace conventional sand, and it is another object of the present invention to provide a sand casting method using the graphite powder composition to solve many disadvantages of conventional sand casting.
The technical scheme adopted by the invention to solve the problems is as follows: the graphite powder composition for casting comprises, by weight, 50-70 parts of graphite powder, 20-40 parts of a ceramic base material and 5-15 parts of a ceramic adhesive, wherein the particle size of the graphite powder is 80-120 meshes, and the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin with the particle size of 300-600 meshes according to the mass ratio of 1:1: 1.
Preferably, the ceramic adhesive is a silicate-based adhesive, a phosphate-based adhesive, or an aluminate ceramic inorganic adhesive.
Preferably, the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin in a sand mixer for 40-60 min.
Preferably, the graphite powder composition is obtained by uniformly mixing 50-70 parts of graphite powder, 20-40 parts of ceramic base material and 5-15 parts of ceramic adhesive in a sand mixer for 40-60 min.
The method for sand casting by using the graphite powder composition for casting comprises the following steps:
preparing a sand mold, namely placing the graphite powder composition into a mold for molding to form a sand mold for casting;
step two, preparing a sand mold, and continuously drying the sand mold obtained in the step one at 400 ℃ for 2h to form the sand mold;
and step three, casting, namely casting by using the sand mould obtained in the step two.
In the first step, the graphite powder composition is formed by cold press molding at a pressure of 200-600 t.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the graphite powder composition used in sand casting provided by the invention takes graphite powder as a main raw material, the ceramic base material is added for improving the integral forming performance of the composition, and the ceramic adhesive is added for improving the integral ductility of the composition, so that the integral performance of the composition can perfectly replace the traditional molding sand, no resin is required to be added, no smoke or waste gas is generated at high temperature, zero emission can be achieved, and the graphite powder composition is more environment-friendly compared with the traditional molding sand.
Secondly, the graphite powder composition used in sand casting can fully exert the physical characteristics of graphite, has excellent collapsibility, can achieve the reuse rate of 100 percent, and saves a large amount of raw material cost compared with the traditional molding sand.
Thirdly, the graphite powder composition used in sand casting adopts cold press molding by matching graphite powder with ceramic base material, has extremely high molding speed, and has better effect and higher efficiency compared with the heating molding adopted in the traditional sand casting.
Fourthly, the graphite powder composition which can be used in sand casting according to the present invention has excellent performance and excellent heat resistance, and the raw materials are substantially inorganic non-metallic materials, and an oxide layer is not formed on the surface of a product formed after casting is completed, such that the quality of the cast product itself can be improved.
Fifth, the graphite powder composition and the casting method for sand casting according to the present invention can effectively recycle the existing graphite waste, improve the utilization rate of the graphite waste, and change the current situation that the graphite waste cannot be effectively recycled.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
the graphite powder composition for casting comprises, by weight, 50 parts of graphite powder, 20 parts of ceramic base material and 5 parts of ceramic adhesive, wherein the particle size of the graphite powder is 80 meshes, and the ceramic base material is formed by uniformly mixing alumina with the particle size of 300 meshes, red yarn and kaolin according to the mass ratio of 1:1: 1.
Further, the ceramic adhesive is a silicate adhesive, a phosphate adhesive or an aluminate ceramic inorganic adhesive.
Further, the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin in a sand mixer for 40 min.
Further, the graphite powder composition is obtained by uniformly mixing 50 parts of graphite powder, 20 parts of ceramic base material and 5 parts of ceramic adhesive in a sand mixer for 40 min.
The method for sand casting by using the graphite powder composition for casting comprises the following steps:
preparing a sand mold, namely placing the graphite powder composition into a mold for molding to form a sand mold for casting;
step two, preparing a sand mold, and continuously drying the sand mold obtained in the step one at 400 ℃ for 2h to form the sand mold;
and step three, casting, namely casting by using the sand mould obtained in the step two.
Further, in the first step, the graphite powder composition is formed by cold press molding at a pressure of 200 t.
Example 2:
the graphite powder composition for casting comprises, by weight, 70 parts of graphite powder, 40 parts of ceramic base material and 15 parts of ceramic binder, wherein the particle size of the graphite powder is 120 meshes, and the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin with the particle size of 600 meshes according to the mass ratio of 1:1: 1.
Further, the ceramic adhesive is a silicate adhesive, a phosphate adhesive or an aluminate ceramic inorganic adhesive.
Further, the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin in a sand mixer for 60 min.
Further, the graphite powder composition is obtained by uniformly mixing 70 parts of graphite powder, 40 parts of ceramic base material and 15 parts of ceramic adhesive in a sand mixer for 60 min.
The method for sand casting by using the graphite powder composition for casting comprises the following steps:
preparing a sand mold, namely placing the graphite powder composition into a mold for molding to form a sand mold for casting;
step two, preparing a sand mold, and continuously drying the sand mold obtained in the step one at 400 ℃ for 2h to form the sand mold;
and step three, casting, namely casting by using the sand mould obtained in the step two.
Further, in the first step, the graphite powder composition is formed by cold press molding at a pressure of 600 t.
Example 3:
the graphite powder composition for casting comprises, by weight, 60 parts of graphite powder, 30 parts of a ceramic base material and 10 parts of a ceramic binder, wherein the particle size of the graphite powder is 100 meshes, and the ceramic base material is formed by uniformly mixing alumina with the particle size of 500 meshes, red yarns and kaolin according to the mass ratio of 1:1: 1.
Further, the ceramic adhesive is a silicate adhesive, a phosphate adhesive or an aluminate ceramic inorganic adhesive.
Further, the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin in a sand mixer for 50 min.
Further, the graphite powder composition is obtained by uniformly mixing 60 parts of graphite powder, 30 parts of ceramic base material and 10 parts of ceramic adhesive in a sand mixer for 50 min.
The method for sand casting by using the graphite powder composition for casting comprises the following steps:
preparing a sand mold, namely placing the graphite powder composition into a mold for molding to form a sand mold for casting;
step two, preparing a sand mold, and continuously drying the sand mold obtained in the step one at 400 ℃ for 2h to form the sand mold;
and step three, casting, namely casting by using the sand mould obtained in the step two.
Further, in the first step, the graphite powder composition is formed by cold press molding at a pressure of 400 t.
In the above embodiment, the alumina may be replaced by quartz sand, or a mixture of alumina and quartz sand.
In the embodiment, the casting process after the third step is a conventional process, and the difference between the sand casting method described in the present application and the conventional process is that the graphite powder composition replaces the molding sand, the graphite powder composition needs to be subjected to cold press molding and drying treatment before casting, after the casting is completed, the graphite powder sand mold can be loosened to the original degree by simple hammering, and the casting process is lossless before and after casting, and can achieve 100% reuse rate.
The graphite powder is used as the molding sand for sand casting, the excellent physical and chemical properties of the graphite powder are fully utilized, the graphite powder has high temperature resistance, high electric and thermal conductivity, high lubricity, high chemical stability, high toughness, high plasticity and high shock resistance, and the defects of the molding sand in the traditional sand casting can be well made up through various properties. The graphite powder waste is applied to sand casting, so that the graphite powder waste is repeatedly and effectively utilized, and the quality of the traditional sand casting process is optimized and improved.
Claims (6)
1. A graphite powder composition for casting, characterized in that: the ceramic material comprises, by weight, 50-70 parts of graphite powder, 20-40 parts of a ceramic base material and 5-15 parts of a ceramic adhesive, wherein the particle size of the graphite powder is 80-120 meshes, and the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin with the particle size of 300-600 meshes according to the mass ratio of 1:1: 1.
2. The foundry graphite powder composition according to claim 1, wherein: the ceramic adhesive is silicate adhesive, phosphate adhesive or aluminate inorganic ceramic adhesive.
3. The foundry graphite powder composition according to claim 1, wherein: the ceramic base material is formed by uniformly mixing alumina, red yarns and kaolin in a sand mixer for 40-60 min.
4. The foundry graphite powder composition according to claim 1, wherein: the graphite powder composition is obtained by uniformly mixing 50-70 parts of graphite powder, 20-40 parts of ceramic base material and 5-15 parts of ceramic adhesive in a sand mixer for 40-60 min.
5. A method for sand casting using the foundry graphite powder composition according to any one of claims 1 to 4, characterized by comprising the steps of:
preparing a sand mold, namely placing the graphite powder composition into a mold for molding to form a sand mold for casting;
step two, preparing a sand mold, and continuously drying the sand mold obtained in the step one at 400 ℃ for 2h to form the sand mold;
and step three, casting, namely casting by using the sand mould obtained in the step two.
6. The method for sand casting using a foundry graphite powder composition according to claim 5, wherein: in the first step, the graphite powder composition is formed by cold press molding at a pressure of 200-600 t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010387547.7A CN111347006B (en) | 2020-05-09 | 2020-05-09 | Graphite powder composition for casting and method for sand casting by using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010387547.7A CN111347006B (en) | 2020-05-09 | 2020-05-09 | Graphite powder composition for casting and method for sand casting by using same |
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| CN111347006A true CN111347006A (en) | 2020-06-30 |
| CN111347006B CN111347006B (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026239A (en) * | 2022-06-16 | 2022-09-09 | 南阳仁创砂业科技有限公司 | Foundry reclaimed sand for preventing sand burning and air hole defects of castings and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026239A (en) * | 2022-06-16 | 2022-09-09 | 南阳仁创砂业科技有限公司 | Foundry reclaimed sand for preventing sand burning and air hole defects of castings and preparation method thereof |
| CN115026239B (en) * | 2022-06-16 | 2023-11-28 | 南阳仁创砂业科技有限公司 | Casting reclaimed sand for preventing sand sticking and air hole defects of castings and preparation method thereof |
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| CN111347006B (en) | 2021-11-19 |
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Denomination of invention: The invention relates to a graphite powder composition for casting and a method for sand casting using it Effective date of registration: 20220402 Granted publication date: 20211119 Pledgee: Pingdingshan Branch of Zhongyuan Bank Co.,Ltd. Pledgor: PINGDINGSHAN XRD GRAPHITE MANUFACTURING CO.,LTD. Registration number: Y2022980003813 |
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Date of cancellation: 20230509 Granted publication date: 20211119 Pledgee: Pingdingshan Branch of Zhongyuan Bank Co.,Ltd. Pledgor: PINGDINGSHAN XRD GRAPHITE MANUFACTURING CO.,LTD. Registration number: Y2022980003813 |
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Denomination of invention: A graphite powder composition for casting and a method for sand casting using it Effective date of registration: 20230613 Granted publication date: 20211119 Pledgee: Pingdingshan Branch of Zhongyuan Bank Co.,Ltd. Pledgor: PINGDINGSHAN XRD GRAPHITE MANUFACTURING CO.,LTD. Registration number: Y2023980043543 |
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