CN111590019A - Manufacturing process and inspection method of coating for precision casting shell - Google Patents
Manufacturing process and inspection method of coating for precision casting shell Download PDFInfo
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- CN111590019A CN111590019A CN202010671718.9A CN202010671718A CN111590019A CN 111590019 A CN111590019 A CN 111590019A CN 202010671718 A CN202010671718 A CN 202010671718A CN 111590019 A CN111590019 A CN 111590019A
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- 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
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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
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- 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
- B22C9/04—Use of lost patterns
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a manufacturing process and an inspection method of a coating for a precision casting shell, which comprises a fabric layer slurry and a reinforcing layer slurry, wherein the fabric layer slurry comprises the following components: 215kg of sodium silicate, 50kg of water and 960kg of fabric layer powder, wherein the reinforcing layer slurry comprises the following components in percentage by weight: 350kg of sodium silicate, 25kg of water and 585kg of shell fabric layer powder, wherein the coating prepared by the formula has stable adhesion to sand, an operator can take a 304 stainless steel sheet with the thickness of 1.4mm and the square side length of 41mm when manufacturing a sand mould, put the stainless steel sheet into the mixed layer slurry for a moment, take out a portable cotton rope, place the stainless steel sheet on a digital high-precision electronic scale when the operator does not visually drip the coating slurry on the stainless steel sheet, remove the weight of the stainless steel sheet according to data, obtain correct slurry weighing data, ensure that 1.6-1.8 g of shell fabric layer weighing data is qualified and 3.5-4 g of reinforcing layer weighing data is qualified, further ensure that the parameters of the prepared sand mould are the same and prevent the sand mould from having defects.
Description
Technical Field
The invention discloses a manufacturing process and an inspection method of a coating for a precision casting shell, and belongs to the technical field of coatings.
Background
Precision casting, which is a general name of a process for obtaining a casting with a precise size, comprises the steps of investment casting, namely lost wax casting, including the procedures of wax pressing, wax trimming, tree assembling, slurry dipping, wax melting, molten metal casting, post-treatment and the like, wherein the lost wax casting is to use wax to manufacture a wax mould of a part to be cast, then the wax mould is coated with paint and sand grains, and the paint and the sand grains are dried and then put into hot water to melt the inner wax mould to form a sand mould.
The coating formulas for the precision casting mold making in the current market are the same, namely the specific dosage of each material in the formula is not quantified in detail, and when the coating is used, operators need to blend according to experience, so that the parameters of the coatings blended by different operators are different, the adhesion of the coatings is unstable, and various defects may exist in the manufactured sand mold.
Disclosure of Invention
The invention aims to solve the technical problem and provides a manufacturing process and an inspection method of a coating for a precision casting shell, so that the problem is solved.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing process of a coating for a precision casting shell comprises a fabric layer slurry and a reinforcing layer slurry, wherein the fabric layer slurry comprises the following components: 215kg of sodium silicate, 50kg of water and 960kg of fabric layer powder, wherein the reinforcing layer slurry comprises the following components in percentage by weight: 350kg of sodium silicate, 25kg of water and 585kg of fabric layer powder, and comprises the following preparation steps:
(1) firstly, 215kg of sodium silicate, 50kg of water and 960kg of shell fabric powder are mixed together and stirred to prepare shell fabric slurry;
(2) mixing 350kg of liquid sodium silicate, 25kg of water and 585kg of fabric layer powder together and stirring to prepare reinforcing layer slurry;
(3) coating the surface material layer slurry on the surface of a wax mould, attaching a first layer of fine sand to the surface of the first layer of surface material layer slurry, coating a second layer of surface material layer slurry on the surface of the first layer of fine sand, attaching a second layer of fine sand to the surface of the second layer of surface material layer slurry, coating a third layer of surface material layer slurry on the surface of the second layer of fine sand, and attaching a third layer of fine sand to the surface of the third layer of surface material layer slurry;
(4) coating the reinforcing layer slurry on the surface of the third layer of fine sand, then attaching a first layer of coarse sand to the surface of the first layer of reinforcing layer slurry, then coating a second layer of reinforcing layer slurry to the surface of the first layer of coarse sand, then attaching a second layer of coarse sand to the surface of the second layer of reinforcing layer slurry, then coating the third layer of reinforcing layer slurry to the surface of the second layer of coarse sand, then attaching a third layer of coarse sand to the surface of the third layer of reinforcing layer slurry, then coating a fourth layer of reinforcing layer slurry to the surface of the third layer of coarse sand, and then attaching a fourth layer of coarse sand to the surface of the fourth layer of reinforcing layer slurry;
(5) the specification of the fine sand is 4# to 5#, the specification of the sodium silicate is 3.5 to 3.8, the fabric layer powder is 325-mesh quartz powder, and the reinforcing layer powder is refractory clay powder.
A method for inspecting a coating for a precision casting shell comprises the following steps:
(1) taking a 304 stainless steel sheet with the thickness of 1.4mm and the side length of a square shape of 41 mm;
(2) placing a stainless steel sheet into the mixed slurry for a moment, taking out a rope by a hand, placing the stainless steel sheet on a digital high-precision electronic scale when the coating slurry on the stainless steel sheet does not drop visually, and removing the weight of the stainless steel sheet by looking at data to obtain correct slurry weighing data;
(3) the fabric layer weighing data of 1.6-1.8 g is qualified, and the reinforcing layer weighing data of 3.5-4 g is qualified.
Compared with the prior art, the invention has the following beneficial effects:
the proportion quantity of the materials added in the raw materials of the invention ensures that a more stable formula is obtained through a plurality of detailed tests, and the coating prepared by the formula has more stable adhesion to sand, an operator can take a square stainless steel sheet with the thickness of 1.4mm and the side length of 41mm when manufacturing a sand mould, put the stainless steel sheet into the mixed slurry for etching, take out the stainless steel sheet by a portable thread rope, place the stainless steel sheet on a digital high-precision electronic scale when observing that the coating slurry on the stainless steel sheet does not drop, remove the weight of the stainless steel sheet by data, obtain correct slurry weighing data, the fabric layer weighing data is qualified by 1.6-1.8 g, the reinforcing layer weighing data is qualified by 3.5-4 g, and further ensure that the prepared sand mould has the same parameters and prevents the sand mould from having flaws.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
A manufacturing process of a coating for a precision casting shell comprises a fabric layer slurry and a reinforcing layer slurry, wherein the fabric layer slurry comprises the following components: 215kg of sodium silicate, 50kg of water and 960kg of fabric layer powder, wherein the reinforcing layer slurry comprises the following components in percentage by weight: 350kg of sodium silicate, 25kg of water and 585kg of fabric layer powder, and comprises the following preparation steps:
(1) firstly, 215kg of sodium silicate, 50kg of water and 960kg of shell fabric powder are mixed together and stirred to prepare shell fabric slurry;
(2) mixing 350kg of liquid sodium silicate, 25kg of water and 585kg of fabric layer powder together and stirring to prepare reinforcing layer slurry;
(3) coating the surface material layer slurry on the surface of a wax mould, attaching a first layer of fine sand to the surface of the first layer of surface material layer slurry, then coating a second layer of surface material layer slurry on the surface of the first layer of fine sand, then attaching a second layer of fine sand to the surface of the second layer of surface material layer slurry, then coating a third layer of surface material layer slurry on the surface of the second layer of fine sand, then attaching a third layer of fine sand to the surface of the third layer of surface material layer slurry, wherein the surface material layer slurry and the fine sand form three layers;
(4) coating the first reinforcing layer slurry on the surface of the third layer of fine sand, then attaching the first layer of coarse sand to the surface of the first layer of reinforcing layer slurry, then coating the second layer of reinforcing layer slurry to the surface of the first layer of coarse sand, then attaching the second layer of coarse sand to the surface of the second layer of reinforcing layer slurry, then coating the third layer of reinforcing layer slurry to the surface of the second layer of coarse sand, then attaching the third layer of coarse sand to the surface of the third layer of reinforcing layer slurry, then coating the fourth layer of reinforcing layer slurry to the surface of the third layer of coarse sand, then attaching the fourth layer of coarse sand to the surface of the fourth layer of reinforcing layer slurry, and the fourth layer of reinforcing layer slurry and the coarse sand are totally four layers;
(5) the specification of the fine sand is 4# to 5#, the liquid concentration of the sodium silicate is 3.5 to 3.8, the surface material layer powder is 325-mesh quartz powder, and the reinforcing layer powder is refractory clay powder.
A method for inspecting a coating for a precision casting shell comprises the following steps:
(1) taking a 304 stainless steel sheet with the thickness of 1.4mm and the side length of a square shape of 41 mm;
(2) placing a stainless steel sheet into the mixed slurry for a moment, taking out a rope by a hand, placing the stainless steel sheet on a digital high-precision electronic scale when the coating slurry on the stainless steel sheet does not drop visually, and removing the weight of the stainless steel sheet by looking at data to obtain correct slurry weighing data;
(3) the fabric layer weighing data of 1.6-1.8 g is qualified, and the reinforcing layer weighing data of 3.5-4 g is qualified.
Specifically, during preparation, 215kg of sodium silicate, 50kg of water and 960kg of shell fabric powder are mixed together and stirred to prepare shell fabric slurry, 350kg of liquid sodium silicate, 25kg of water and 585kg of shell fabric powder are mixed together and stirred to prepare reinforcing layer slurry, the first shell fabric slurry is coated on the surface of a wax mould, then first layer of fine sand is coated on the surface of the first shell fabric slurry, then second layer of shell fabric slurry is coated on the surface of the first layer of fine sand, then second layer of fine sand is coated on the surface of the second layer of shell fabric slurry, then third layer of shell fabric slurry is coated on the surface of the second layer of fine sand, and then third layer of fine sand is coated on the surface of the third layer of shell fabric slurry, wherein the shell fabric slurry and the fine sand are respectively coated by three layers; and smearing the first reinforcing layer slurry on the surface of the third layer of fine sand, attaching the first layer of coarse sand to the surface of the first layer of reinforcing layer slurry, smearing the second layer of reinforcing layer slurry to the surface of the first layer of coarse sand, attaching the second layer of coarse sand to the surface of the second layer of reinforcing layer slurry, smearing the third layer of reinforcing layer slurry to the surface of the second layer of coarse sand, attaching the third layer of coarse sand to the surface of the third layer of reinforcing layer slurry, smearing the fourth layer of reinforcing layer slurry to the surface of the third layer of coarse sand, and attaching the fourth layer of coarse sand to the surface of the fourth layer of reinforcing layer slurry. When the fabric layer slurry and the reinforcing layer slurry are prepared, a 304 stainless steel sheet with the thickness of 1.4mm and the square side length of 41mm is taken, the stainless steel sheet is placed into the stirred layer slurry for a moment, a portable cord is taken out, when the coating slurry on the stainless steel sheet does not drip down visually, a digital high-precision electronic scale is placed on the stainless steel sheet, the weight of the stainless steel sheet is removed according to data, correct slurry weighing data is obtained, the fabric layer weighing data is qualified when 1.6-1.8 g, and the reinforcing layer weighing data is qualified when 3.5-4 g, so that whether the fabric layer slurry and the reinforcing layer slurry are qualified or not can be effectively detected.
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 (2)
1. The manufacturing process of the coating for the shell of the precision casting is characterized by comprising a fabric layer slurry and a reinforcing layer slurry, wherein the fabric layer slurry comprises the following components in percentage by weight: 215kg of sodium silicate, 50kg of water and 960kg of fabric layer powder, wherein the reinforcing layer slurry comprises the following components in percentage by weight: 350kg of sodium silicate, 25kg of water and 585kg of fabric layer powder, and comprises the following preparation steps:
(1) firstly, 215kg of sodium silicate, 50kg of water and 960kg of shell fabric powder are mixed together and stirred to prepare shell fabric slurry;
(2) mixing 350kg of liquid sodium silicate, 25kg of water and 585kg of fabric layer powder together and stirring to prepare reinforcing layer slurry;
(3) coating a first layer of surface material slurry on the surface of a wax mould, attaching a first layer of fine sand to the surface of the first layer of surface material slurry, coating a second layer of surface material slurry on the surface of the first layer of fine sand, attaching a second layer of fine sand to the surface of the second layer of surface material slurry, coating a third layer of surface material slurry on the surface of the second layer of fine sand, and attaching a third layer of fine sand to the surface of the third layer of surface material slurry;
(4) coating the first reinforcing layer slurry on the surface of the third layer of fine sand, then attaching the first layer of coarse sand to the surface of the first layer of reinforcing layer slurry, then coating the second layer of reinforcing layer slurry to the surface of the first layer of coarse sand, then attaching the second layer of coarse sand to the surface of the second layer of reinforcing layer slurry, then coating the third layer of reinforcing layer slurry to the surface of the second layer of coarse sand, then attaching the third layer of coarse sand to the surface of the third layer of reinforcing layer slurry, then coating the fourth layer of reinforcing layer slurry to the surface of the third layer of coarse sand, and then attaching the fourth layer of coarse sand to the surface of the fourth layer of reinforcing layer slurry;
(5) the specification of the fine sand is 4# to 5#, the liquid concentration of the sodium silicate is 3.5 to 3.8, the surface material layer powder is 325-mesh quartz powder, and the reinforcing layer powder is refractory clay powder.
2. A method for inspecting a coating for a precision casting shell is characterized by comprising the following steps:
(1) a304 stainless steel sheet with the thickness of 1.4mm and the side length of a square shape of 41mm is taken.
(2) And (3) putting the stainless steel sheet into the mixed slurry for a moment, taking out the rope by hand, placing the stainless steel sheet on a digital high-precision electronic scale when the coating slurry on the stainless steel sheet does not drop visually, and removing the weight of the stainless steel sheet according to the data to obtain correct slurry weighing data.
(3) The fabric layer weighing data of 1.6-1.8 g is qualified, and the reinforcing layer weighing data of 3.5-4 g is qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671718.9A CN111590019A (en) | 2020-07-14 | 2020-07-14 | Manufacturing process and inspection method of coating for precision casting shell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010671718.9A CN111590019A (en) | 2020-07-14 | 2020-07-14 | Manufacturing process and inspection method of coating for precision casting shell |
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| CN111590019A true CN111590019A (en) | 2020-08-28 |
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| CN202010671718.9A Pending CN111590019A (en) | 2020-07-14 | 2020-07-14 | Manufacturing process and inspection method of coating for precision casting shell |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB202273A (en) * | 1922-08-11 | 1923-12-20 | Daniel Harvey Meloche | Improvements in coatings for metal moulds for use in casting metals |
| US2883724A (en) * | 1954-04-01 | 1959-04-28 | Rolls Royce | Casting processes |
| CN101138781A (en) * | 2007-09-24 | 2008-03-12 | 中国南车集团戚墅堰机车车辆工艺研究所 | Investment casting formwork and method of producing the same |
| CN101992263A (en) * | 2010-11-08 | 2011-03-30 | 上海市机械制造工艺研究所有限公司 | Process for large high-alloy steel resin bonded sand mould composite coating |
-
2020
- 2020-07-14 CN CN202010671718.9A patent/CN111590019A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB202273A (en) * | 1922-08-11 | 1923-12-20 | Daniel Harvey Meloche | Improvements in coatings for metal moulds for use in casting metals |
| US2883724A (en) * | 1954-04-01 | 1959-04-28 | Rolls Royce | Casting processes |
| CN101138781A (en) * | 2007-09-24 | 2008-03-12 | 中国南车集团戚墅堰机车车辆工艺研究所 | Investment casting formwork and method of producing the same |
| CN101992263A (en) * | 2010-11-08 | 2011-03-30 | 上海市机械制造工艺研究所有限公司 | Process for large high-alloy steel resin bonded sand mould composite coating |
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Application publication date: 20200828 |