CN112238208A - Preparation method of special precoated sand for steering gear - Google Patents
Preparation method of special precoated sand for steering gear Download PDFInfo
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- CN112238208A CN112238208A CN202011170575.XA CN202011170575A CN112238208A CN 112238208 A CN112238208 A CN 112238208A CN 202011170575 A CN202011170575 A CN 202011170575A CN 112238208 A CN112238208 A CN 112238208A
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- Prior art keywords
- sand
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- steering gear
- preparation
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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
Abstract
The invention discloses a preparation method of special precoated sand for a steering gear, which comprises the following raw materials in parts by weight: 100-200 parts of baking sand, 80-150 parts of phenolic resin, 20-40 parts of urotropine, 1-4 parts of calcium stearate and 2-5 parts of reinforcing agent. This preparation method of special tectorial membrane sand of steering gear, through after baking sand changes the calcination sand into through the stoving sand, reduce the linear expansion of (98%) silica sand to avoid producing the extrusion because of high temperature expansion between the sand grain and bursting apart, secondly, through the granularity adjustment, by original three sieve concentrations, adjust to four sieve concentrations, at tectorial membrane sand core making in-process, reinforcing exhaust and heat conduction, thereby avoid the appearance of tectorial membrane psammitolite sub-interlayer, compromise the smooth finish on foundry goods surface simultaneously.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a preparation method of special precoated sand for a steering gear.
Background
In the existing automobile industry, an engine, a brake and a steering gear are three major core components, and the steering gear controls the direction of an automobile and plays a crucial role in self safety, safety of others and social hazards, so that the function of the steering gear is non-trivial and non-trivial. The inner cavity burr problem of 85% of the existing steering gear occurs in the casting process, the problem cannot be solved by using the existing precoated sand, and new technology is generated due to new requirements.
The existing precoated sand takes 70/140 dried sand as a sand base, firstly, irregular interlayer phenomenon occurs in the core making process, and molten metal breaks through the surface layer and drills into the interlayer during casting, so that burrs are generated on a casting. Secondly, because the drying sand linearly expands during casting, the sand grains and the sand grains are mutually extruded in the expansion process, so that the surface layer of the sand core is cracked, and the molten metal is drilled into cracks during casting, so that burrs are generated on the casting. Aiming at the problem, the special precoated sand for the steering gear is provided through research and development, so that the problem of burrs of the inner cavity of a casting is solved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of special precoated sand for a steering gear, which has the advantages of enhancing exhaust and heat conduction in the core making process of the precoated sand, avoiding the occurrence of a sub-interlayer of a precoated sand core, simultaneously considering the smoothness of the surface of a casting and the like, and solves the problems of the background art.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of special precoated sand for a steering gear comprises the following raw materials in parts by weight: 100-200 parts of baking sand, 80-150 parts of phenolic resin, 20-40 parts of urotropine, 1-4 parts of calcium stearate and 2-5 parts of reinforcing agent.
Preferably, the particle size of the roasted sand is 50/140 meshes.
Preferably, the urotropin is a 19% urotropin aqueous solution at the time of addition.
Preferably, the feed comprises the following raw materials in parts by weight: 170 parts of roasted sand, 85 parts of phenolic resin, 26 parts of urotropine, 2 parts of calcium stearate and 3 parts of reinforcing agent.
Preferably, the feed comprises the following raw materials in parts by weight: 110 parts of roasted sand, 90 parts of phenolic resin, 27 parts of urotropine, 3 parts of calcium stearate and 4 parts of reinforcing agent.
The invention provides a preparation method of special precoated sand for a steering gear, which comprises the following steps:
1) firstly, putting roasted sand into a heater, heating to 130 ℃, and putting into a sand mixer;
2) adding phenolic resin (accounting for 2.2 percent of the weight of the roasted sand) into a sand mixer, simultaneously adding a reinforcing agent (accounting for 0.1 percent of the weight of the resin), and mixing and grinding for 40-50S;
3) when the temperature of the raw sand is reduced to 90-110 ℃, a 19% urotropine aqueous solution (1: 2) starting the blower;
4) when the mixture is ground until the large blocks are about to be crushed, the blower is closed and calcium stearate (accounting for 0.1 to 0.15 percent of the weight of the sand) is added;
5) when the temperature is reduced to below 80 ℃, discharging, crushing, cooling and screening to obtain the product.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of the special precoated sand for the steering gear, which has the following beneficial effects:
this preparation method of special tectorial membrane sand of steering gear, through after baking sand changes the calcination sand into through the stoving sand, reduce the linear expansion of (98%) silica sand to avoid producing the extrusion because of high temperature expansion between the sand grain and bursting apart, secondly, through the granularity adjustment, by original three sieve concentrations, adjust to four sieve concentrations, at tectorial membrane sand core making in-process, reinforcing exhaust and heat conduction, thereby avoid the appearance of tectorial membrane psammitolite sub-interlayer, compromise the smooth finish on foundry goods surface simultaneously.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a preparation method of special precoated sand for a steering gear comprises the following steps:
1) firstly, putting 110 parts of roasted sand into a heater, heating to 130 ℃, and putting into a sand mixer;
2) adding 90 parts of phenolic resin (accounting for 2.2 percent of the weight of the roasted sand) into a sand mixer, simultaneously adding 4 parts of reinforcing agent (accounting for 0.1 percent of the resin) into the sand mixer, and mixing and grinding for 40-50S;
3) when the temperature of the raw sand is reduced to 90-110 ℃, 27 parts of 19% urotropine aqueous solution (1: 2) starting the blower;
4) when the mixture is ground until the large blocks are about to be crushed, 3 parts of calcium stearate (accounting for 0.1-0.15 percent of the weight of the sand) is added after the blower is turned off;
5) when the temperature is reduced to below 80 ℃, discharging, crushing, cooling and screening to obtain the product.
Example two: a preparation method of special precoated sand for a steering gear comprises the following steps:
1) firstly, 170 parts of roasted sand is put into a heater and is put into a sand mixer when being heated to 130 ℃;
2) adding 85 parts of phenolic resin (accounting for 2.2 percent of the weight of the roasted sand) into a sand mixer, simultaneously adding 3 parts of reinforcing agent (accounting for 0.1 percent of the resin) into the sand mixer, and mixing and grinding for 40-50S;
3) when the temperature of the raw sand is reduced to 90-110 ℃, 26 parts of 19% urotropine aqueous solution (1: 2) starting the blower;
4) when the mixture is ground until the large blocks are about to be crushed, the blower is closed and 2 parts of calcium stearate (accounting for 0.1 to 0.15 percent of the weight of the sand) are added;
5) when the temperature is reduced to below 80 ℃, discharging, crushing, cooling and screening to obtain the product.
The invention has the beneficial effects that: this preparation method of special tectorial membrane sand of steering gear, through after baking sand changes the calcination sand into through the stoving sand, reduce the linear expansion of (98%) silica sand to avoid producing the extrusion because of high temperature expansion between the sand grain and bursting apart, secondly, through the granularity adjustment, by original three sieve concentrations, adjust to four sieve concentrations, at tectorial membrane sand core making in-process, reinforcing exhaust and heat conduction, thereby avoid the appearance of tectorial membrane psammitolite sub-interlayer, compromise the smooth finish on foundry goods surface simultaneously.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The preparation method of the special precoated sand for the steering gear is characterized by comprising the following raw materials in parts by weight: 100-200 parts of baking sand, 80-150 parts of phenolic resin, 20-40 parts of urotropine, 1-4 parts of calcium stearate and 2-5 parts of reinforcing agent.
2. The preparation method of the coated sand specially used for the steering gear according to claim 1, wherein the particle size of the roasting sand is 50/140 meshes.
3. The method for preparing the precoated sand special for the steering gear according to claim 1, wherein the urotropine is a 19% urotropine aqueous solution when being added.
4. The preparation method of the special precoated sand for the steering gear according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 170 parts of roasted sand, 85 parts of phenolic resin, 26 parts of urotropine, 2 parts of calcium stearate and 3 parts of reinforcing agent.
5. The preparation method of the special precoated sand for the steering gear according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 110 parts of roasted sand, 90 parts of phenolic resin, 27 parts of urotropine, 3 parts of calcium stearate and 4 parts of reinforcing agent.
6. The preparation method of the precoated sand special for the steering gear is characterized by comprising the following steps of:
1) firstly, putting roasted sand into a heater, heating to 130 ℃, and putting into a sand mixer;
2) adding phenolic resin (accounting for 2.2 percent of the weight of the roasted sand) into a sand mixer, simultaneously adding a reinforcing agent (accounting for 0.1 percent of the weight of the resin), and mixing and grinding for 40-50S;
3) when the temperature of the raw sand is reduced to 90-110 ℃, a 19% urotropine aqueous solution (1: 2) starting the blower;
4) when the mixture is ground until the large blocks are about to be crushed, the blower is closed and calcium stearate (accounting for 0.1 to 0.15 percent of the weight of the sand) is added;
5) when the temperature is reduced to below 80 ℃, discharging, crushing, cooling and screening to obtain the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011170575.XA CN112238208A (en) | 2020-10-28 | 2020-10-28 | Preparation method of special precoated sand for steering gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011170575.XA CN112238208A (en) | 2020-10-28 | 2020-10-28 | Preparation method of special precoated sand for steering gear |
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| Publication Number | Publication Date |
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| CN112238208A true CN112238208A (en) | 2021-01-19 |
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| CN202011170575.XA Pending CN112238208A (en) | 2020-10-28 | 2020-10-28 | Preparation method of special precoated sand for steering gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935181A (en) * | 2021-01-29 | 2021-06-11 | 江门市磊茂五金制品有限公司 | Casting sand core resin sand and preparation thereof |
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| CN102688977A (en) * | 2012-06-12 | 2012-09-26 | 西峡县众德汽车部件有限公司 | High-strength core-preparing precoated sand and preparation process thereof |
| CN102921878A (en) * | 2012-11-14 | 2013-02-13 | 中国重汽集团济南动力有限公司 | Precoated sand and preparation method thereof |
| CN106552902A (en) * | 2017-01-13 | 2017-04-05 | 承德北雁铸造材料有限公司 | Efficient anti-vein type precoated sand and preparation method thereof |
| CN108127074A (en) * | 2017-12-22 | 2018-06-08 | 常州市长江铸工材料有限公司 | Low flue gas precoated sand of a kind of cracking resistance and preparation method thereof |
| CN108213324A (en) * | 2018-02-11 | 2018-06-29 | 常州中车汽车零部件有限公司 | A kind of high-accuracy cast precoated sand and preparation method thereof |
| CN108273958A (en) * | 2017-12-29 | 2018-07-13 | 沈阳金安铸造材料有限公司 | A kind of preparation method of Anti-vein precoated sand |
| CN108911579A (en) * | 2018-08-17 | 2018-11-30 | 王建国 | The production method and application of new-type precoated sand |
| CN110434278A (en) * | 2019-09-10 | 2019-11-12 | 合肥仁创铸造材料有限公司 | High temperature resistant, it is low get angry, low bulk, easily defeated and dispersed precoated sand and preparation method thereof |
-
2020
- 2020-10-28 CN CN202011170575.XA patent/CN112238208A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688977A (en) * | 2012-06-12 | 2012-09-26 | 西峡县众德汽车部件有限公司 | High-strength core-preparing precoated sand and preparation process thereof |
| CN102921878A (en) * | 2012-11-14 | 2013-02-13 | 中国重汽集团济南动力有限公司 | Precoated sand and preparation method thereof |
| CN106552902A (en) * | 2017-01-13 | 2017-04-05 | 承德北雁铸造材料有限公司 | Efficient anti-vein type precoated sand and preparation method thereof |
| CN108127074A (en) * | 2017-12-22 | 2018-06-08 | 常州市长江铸工材料有限公司 | Low flue gas precoated sand of a kind of cracking resistance and preparation method thereof |
| CN108273958A (en) * | 2017-12-29 | 2018-07-13 | 沈阳金安铸造材料有限公司 | A kind of preparation method of Anti-vein precoated sand |
| CN108213324A (en) * | 2018-02-11 | 2018-06-29 | 常州中车汽车零部件有限公司 | A kind of high-accuracy cast precoated sand and preparation method thereof |
| CN108911579A (en) * | 2018-08-17 | 2018-11-30 | 王建国 | The production method and application of new-type precoated sand |
| CN110434278A (en) * | 2019-09-10 | 2019-11-12 | 合肥仁创铸造材料有限公司 | High temperature resistant, it is low get angry, low bulk, easily defeated and dispersed precoated sand and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935181A (en) * | 2021-01-29 | 2021-06-11 | 江门市磊茂五金制品有限公司 | Casting sand core resin sand and preparation thereof |
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Application publication date: 20210119 |