CN110842155A - Waste incineration grate precoated sand shell mold casting process - Google Patents
Waste incineration grate precoated sand shell mold casting process Download PDFInfo
- Publication number
- CN110842155A CN110842155A CN201911172497.4A CN201911172497A CN110842155A CN 110842155 A CN110842155 A CN 110842155A CN 201911172497 A CN201911172497 A CN 201911172497A CN 110842155 A CN110842155 A CN 110842155A
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- China
- Prior art keywords
- mold
- core
- sand
- shell
- waste incineration
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C25/00—Foundry moulding plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
- B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a casting process of a precoated sand shell mold of a waste incineration grate. The method for producing the waste incineration grate by adopting the core manufacturing method not only can improve the casting precision, but also can greatly reduce the casting cost.
Description
Technical Field
The invention relates to the field of manufacturing of waste incineration grates, in particular to a casting process of a precoated sand shell mold of a waste incineration grate.
Background
In the prior art, the processes for manufacturing the waste incineration grate mainly comprise a sand casting method, a lost foam casting method and the like. However, each method has disadvantages such as low accuracy and large casting defects.
The metal investment casting method has high casting precision, but has long period and high cost.
The precoated sand shell mold casting has the advantages of less equipment investment, small occupied area, convenient production, high production efficiency, less sand for casting, less dust on production site, low noise and less pollution to the environment. Meanwhile, the method has the characteristics of high surface smoothness, high size precision and the like of the produced casting, so that the coated sand shell mold casting process can meet the requirement of high precision of the waste incineration grate and can greatly reduce the manufacturing cost.
Disclosure of Invention
The embodiment of the invention provides a waste incineration grate precoated sand shell mold casting process, which comprises the following steps:
adjusting a mold: fixing the mold on a sand shooting machine, and spraying a proper amount of release agent to an inner cavity of a core box after checking and adjusting;
preparing a shell: making a shell mold and a shell core by a hot core box method;
burying a box: placing the assembled model in a sand box, filling and exposing a pouring gate, and waiting for pouring after negative pressure is pumped;
pouring; taking out of the box after cooling;
cleaning, polishing and machining.
The method for producing the waste incineration grate by adopting the core manufacturing method not only can improve the casting precision, but also can greatly reduce the casting cost.
Further, in the step of adjusting the mold, the main steps of checking and adjusting are as follows: and (5) repeatedly opening and closing the mold, and checking the closed gap and the top mold condition of the mold.
Furthermore, in the step of making the shell, the hot core box method mainly comprises the steps of die filling, die adjusting, die heating, sand shooting, curing, core repairing and core assembling.
Further, in the shell-making step, the temperature of the casting mold is 220-260 ℃, the sand-shooting time is controlled to be 3-10 s, and the sand-shooting pressure is controlled to be 0.35-0.45 MPa.
Further, the time of the curing step is 200-400 s.
Furthermore, after the core is ejected out each time, the bonded sand on the box dividing surface, the sand shooting surface and the surface of the box cavity is cleaned, and the subsequent operation is carried out after the bonded sand is blown clean by compressed air.
Further, in the core trimming step, the flash, fleshiness of the shell core are lightly ground with waste pellets or sandpaper without damaging other surfaces.
Further, the casting portion and the core head portion of the core may have smaller pits that can be repaired with a dedicated repair paste.
Further, the repaired core must be air dried or baked before use.
Furthermore, after core assembly, sand is enclosed by a buried box, and negative pressure pouring is carried out.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of a waste incineration grate precoated sand shell mold casting process according to an embodiment of the invention.
Detailed Description
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1, the casting process of the waste incineration grate precoated sand shell mold provided by the embodiment of the invention comprises the following steps:
adjusting a mold: fixing the mold on a sand shooting machine, and spraying a proper amount of release agent to an inner cavity of a core box after checking and adjusting;
preparing a shell: making a shell mold and a shell core by a hot core box method;
burying a box: placing the assembled model in a sand box, filling and exposing a pouring gate, and waiting for pouring after negative pressure is pumped;
pouring; taking out of the box after cooling;
cleaning, polishing and machining.
The method for producing the waste incineration grate by adopting the core manufacturing method not only can improve the casting precision, but also can greatly reduce the casting cost.
Specifically, the precoated sand is novel precoated sand which is produced by a special process formula technology and has excellent high-temperature performance (high strength at high temperature, long heat-resisting time, small thermal expansion amount and low gas evolution) and comprehensive casting performance.
The precoated sand is more suitable for complex thin-wall precise iron castings and high-requirement steel castings, so that the process used in the invention can greatly improve the quality of products.
Further, in the step of adjusting the mold, the main steps of checking and adjusting are as follows: and (5) repeatedly opening and closing the mold, and checking the closed gap and the top mold condition of the mold. In the shell making step, the hot core box method mainly comprises the steps of die filling, die adjusting, die heating, sand shooting, curing, core repairing and core assembling. The temperature of the casting mold is 220-260 ℃, the sand shooting time is controlled to be 3-10 s, generally 5s, and if the time is too short, the sand mold (core) can not be formed. The sand shooting pressure is controlled to be 0.35-0.45MPa, generally controlled to be about 0.45MPa, otherwise, the pressure is too low, and the phenomenon of insufficient shooting or loosening is easily caused. The time for the curing step was 200-400 s.
Of course, the environmental parameters can be adjusted according to different cores according to process regulations. The curing time is mainly determined by the thickness of the sand mold (core) and the temperature of the mold, and in the invention, the curing time is 300 s.
And cooling to below 600 ℃ after pouring and taking out the box.
Moreover, the hot core box process can enable the grate casting blank to be more accurate in size, reduce machining allowance and save cost; the defects of castings such as air holes and the like are reduced, and the influence on the environment is reduced; the fluidity is improved, so that the rejection rate of the castings is reduced;
furthermore, after the core is ejected out each time, the bonded sand on the box dividing surface, the sand shooting surface and the surface of the box cavity is cleaned, and the subsequent operation is carried out after the bonded sand is blown clean by compressed air.
Further, in the core trimming step, the flash, fleshiness of the shell core are lightly ground with waste pellets or sandpaper without damaging other surfaces.
Further, the casting portion and the core head portion of the core may have smaller pits that can be repaired with a dedicated repair paste. It should be noted that the repair cannot be performed due to the large area and the quality after repair, and the repair must be discarded.
Further, the repaired core must be air dried or baked before use.
Furthermore, after core assembly, sand is enclosed by a buried box, and negative pressure pouring is carried out. It should be noted that in the core assembling step, before the cores to be assembled are assembled, the cores must be carefully inspected to confirm that the core meets the technical requirements of the shell core. When the core is bonded (special adhesive is used), whether all parts of the core are combined in place or not needs to be checked, and the core is placed to be flat after the core is qualified so as to prevent deformation or dislocation. The joint seam of the combined core needs to be repaired by special repair paste to be flat and smooth and is fully dried.
The invention adopts an intermediate frequency furnace for smelting, and the smelting process is executed according to different materials according to smelting regulations.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The waste incineration grate precoated sand shell mold casting process is characterized by comprising the following steps:
adjusting a mold: fixing the mold on a sand shooting machine, and spraying a proper amount of release agent to an inner cavity of a core box after checking and adjusting;
preparing a shell: making a shell mold and a shell core by a hot core box method;
burying a box: placing the assembled model in a sand box, filling and exposing a pouring gate, and waiting for pouring after negative pressure is pumped;
pouring; taking out of the box after cooling;
cleaning, polishing and machining.
2. The waste incineration grate precoated sand shell mold casting process according to claim 1,
in the step of adjusting the mold, the main steps of checking and adjusting are as follows: and (5) repeatedly opening and closing the mold, and checking the closed gap and the top mold condition of the mold.
3. The waste incineration grate precoated sand shell mold casting process according to claim 1, wherein in the shell making step, the hot core box method mainly comprises the steps of mold filling, mold adjustment, mold heating, sand shooting, curing, core repair and core assembly.
4. The casting process of the coated sand shell mold for the waste incineration grate as set forth in claim 3, wherein in the shell-making step, the temperature of the casting mold is 220-260 ℃, the sand-shooting time is controlled to be 3-10 s, and the sand-shooting pressure is controlled to be 0.35-0.45 MPa.
5. The waste incineration grate precoated sand shell mold casting process according to claim 3, wherein the time of the curing step is 200-400 seconds.
6. The process of casting a coated sand shell mold for a waste incineration grate as set forth in claim 3, wherein after each ejection of the core, the bonded sand on the surfaces of the box dividing surface, the sand ejecting surface and the box cavity is removed, and the core is blown clean by compressed air before subsequent operations.
7. The waste incineration grate precoated sand shell casting process according to claim 3, wherein in the core trimming step, the flash, the fleshiness of the shell core are lightly ground by using waste core blocks or sand paper, and other surfaces are not damaged.
8. The process of casting a coated sand shell mold for a refuse incinerator grate as claimed in claim 7 wherein if there is a small pit in the cast portion and core head portion of the core, it can be repaired with a special repair paste.
9. The process of casting a coated sand shell mold for a waste incineration grate as set forth in claim 7, wherein the repaired core must be air dried or baked before use.
10. The casting process of the waste incineration grate precoated sand shell mold according to claim 3, characterized in that after core assembly, sand is enclosed by a buried box, and negative pressure pouring is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911172497.4A CN110842155A (en) | 2019-11-26 | 2019-11-26 | Waste incineration grate precoated sand shell mold casting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911172497.4A CN110842155A (en) | 2019-11-26 | 2019-11-26 | Waste incineration grate precoated sand shell mold casting process |
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| CN110842155A true CN110842155A (en) | 2020-02-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545708A (en) * | 2020-05-12 | 2020-08-18 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
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Application publication date: 20200228 |