CN113484194B - Method for checking oil removal quality of module - Google Patents
Method for checking oil removal quality of module Download PDFInfo
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- CN113484194B CN113484194B CN202110744732.1A CN202110744732A CN113484194B CN 113484194 B CN113484194 B CN 113484194B CN 202110744732 A CN202110744732 A CN 202110744732A CN 113484194 B CN113484194 B CN 113484194B
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- oil removal
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- detection liquid
- quality
- silica sol
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- 238000000034 method Methods 0.000 title claims abstract description 28
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 55
- 238000001514 detection method Methods 0.000 claims description 53
- 239000000080 wetting agent Substances 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 238000005238 degreasing Methods 0.000 claims description 8
- 238000005530 etching Methods 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000002344 surface layer Substances 0.000 abstract description 9
- 239000011230 binding agent Substances 0.000 abstract description 5
- 238000012797 qualification Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 42
- 238000007689 inspection Methods 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005495 investment casting Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052845 zircon Inorganic materials 0.000 description 3
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for detecting the oil removal quality of a module, which is a method for refining whether the oil removal quality of the surface of the module meets the coating requirement of a shell manufacturing process or not in a coating shell manufacturing surface coating process by taking silica sol as a main binder. And the device is used as a checking means to screen the product quality from the source, avoid unqualified modules from flowing into the post-process, reduce the scrapping of castings caused by incomplete oil removal, improve the product quality and improve the product qualification rate. The invention has the advantages of energy conservation, environmental protection, high economic benefit, no need of purchasing additional reagents and raw materials, convenient operation and strong field practicability, and uses the shell-making surface layer slurry as the raw material.
Description
Technical Field
The invention belongs to the field of investment casting, and particularly relates to a method for checking oil removal quality of a module.
Background
With the development of the investment casting industry, the requirements on the dimensional accuracy and the surface roughness of castings are increasingly increased nowadays. And dimensional accuracy and surface roughness of the casting are directly affected by the wax pattern and shell. Therefore, it is important to ensure the quality of the wax pattern module. The good shell requires no redundant grease on the surface of the wax pattern module, and has good wettability. However, conventional model wax is hydrophobic, and coating is difficult to coat on the surface of a wax mould, so that mould degreasing etching is needed to remove superfluous grease on the surface of the wax mould, the uniform coating of shell-making slurry on the surface of the wax mould is ensured, and defects such as pits or sand sticking are avoided when sand grains are directly contacted with the surface of the wax mould or stacked during sand spraying and casting are avoided. However, since the coating quality of the shell surface layer is affected by the part structure and the viscosity of each batch of coating binder, the coating quality is unstable, and the surface state of the module lacks an inspection method, the surface defects are exposed after the shell is cast, and the casting is scrapped.
Disclosure of Invention
The invention aims to overcome the defects, and provides a method for checking the oil removal quality of a module, which is used for judging the oil removal condition of the module, judging whether the surface quality of a wax mould module is qualified or not before shell making and pouring, reducing the surface defect of a casting caused by incomplete oil removal, and improving the qualification rate of products.
In order to achieve the above object, the present invention comprises the steps of:
s1, according to SiO in silica sol 2 Judging the viscosity range of the oil removal detection liquid and the applicability of the specific structural parts by mass fraction, particle specific surface area and particle size range;
s2, according to SiO 2 Judging the surface quality of the module according to the mass fraction, the specific surface area of particles and the particle size range;
s3, determining a test research object of the oil removal detection liquid;
s4, preparing oil removal detection liquid;
s5, cleaning the surface of the module to be detected;
s6, degreasing the module to be inspected by adopting a degreasing detection liquid;
s7, judging the condition after oil removal.
In S1, silica sol and a wetting agent are selected as main components of the oil removal detection liquid.
The volume ratio of the silica sol to the wetting agent is 1: 5%
In S3, the test study object adopts a large bending and twisting surface, a large plane wax module or a part with a structure of an inner cavity and a blind hole.
And S4, mixing 25Kg of silica sol with 125g of wetting agent, uniformly stirring, standing, and after a large number of bubbles on the surface of the liquid disappear, preparing the oil removal detection liquid.
And S5, if the surface of the module to be detected has redundancy, blowing the module to be detected clean by using compressed air.
And S6, placing the module to be inspected in the oil removal detection liquid for 2-3S, or sprinkling the oil removal detection liquid on the surface of the module to be inspected.
S7, if the oil removal detection liquid is not dispersed in 3-5S, the surface of the module achieves the etching effect, the coating requirement of the shell making slurry is met, and the oil removal is qualified; if the oil removal detection liquid spreads in 3S-5S, the oil removal is unqualified.
Compared with the prior art, the coating process of the coating shell making surface layer mainly using silica sol as a binder is refined to obtain a method for detecting whether the surface oil removal quality of the module meets the coating requirement of the shell making process. And the device is used as a checking means to screen the product quality from the source head, avoid unqualified modules from flowing into the post-process, reduce the scrapping of castings caused by incomplete oil removal, improve the product quality and improve the product qualification rate. The invention has the advantages of energy conservation, environmental protection, high economic benefit, no need of purchasing additional reagents and raw materials, convenient operation and strong field practicability, and uses the shell-making surface layer slurry as the raw material.
Detailed Description
The invention is further illustrated below with reference to examples.
The invention comprises the following steps:
s1, according to SiO in silica sol 2 Judging the viscosity range of the oil removal detection liquid and the applicability of the specific structural parts by mass fraction, particle specific surface area and particle size range; in order to ensure that the quality of the module and the subsequent shell making are not affected in the inspection process, and the simulation inspection and test accords with the coating manufacturability of the shell making slurry, the main components of the oil removal detection liquid are selected from silica sol and wetting agent, and the volume ratio of the silica sol to the wetting agent is 1: 5%
S2, according to SiO 2 Judging the surface quality of the module according to the mass fraction, the specific surface area of particles and the particle size range; siO (SiO) 2 The higher the content, the larger the viscosity value, the larger the specific surface area of the particles, the larger the viscosity, the more complex the part structure, and the smaller the viscosity of the required adhesive, so that the surface quality of the module is judged by performing tests according to the parametersAmount of the components.
The required tooling is as follows:
size of stainless steel cylinder for containing oil removal detection liquid: phi 420mm x 400mm;
oil removal detection liquid mainly comprises the following components in percentage by weight:
the volume amount of silica sol required: 1 barrel of silica sol with the specification of 25 Kg/barrel is selected.
The required volume amount of wetting agent: using a graduated cylinder, according to the silica sol: wetting agent = 1: preparing a detection solution for use in 5%.
S3, determining a test research object of the oil removal detection liquid; when the surface of the wax mould with a large bending and twisting surface or a large plane is deoiled, the water-based deoiling agent flows faster on the large plane because the wax mould is hydrophobic and oleophylic in nature, and the phenomenon of incomplete surface deoiling is easy to occur. Meanwhile, the parts with the structures of the inner cavity and the blind holes are easy to have the phenomenon that the degreasing agent cannot contact the parts to cause incomplete degreasing. Therefore, the part with the two structures is selected as a test piece at the time to be more representative.
S4, preparing oil removal detection liquid; preparing oil removal detection liquid according to the silica sol plus 5 per mill wetting agent (volume ratio). Firstly, pouring 25Kg of silica sol into a prepared stainless steel barrel, measuring 125g of wetting agent by using a measuring cylinder, pouring into the stainless steel barrel filled with the silica sol, stirring until the mixture is uniform, standing, and after a large amount of bubbles on the surface of the liquid disappear, obtaining the product which can be used for module inspection.
S5, cleaning the surface of the module to be detected; a module for deoiling detection should avoid appearing the unnecessary thing interference such as wax bits, water stain on the surface. If there is excess on the surface, compressed air should be used to blow clean.
S6, degreasing the module to be inspected by adopting a degreasing detection liquid; through repeated experiments, the coating process of the shell making surface layer is simulated, and the judgment is more accurate by summarizing the following methods: placing the module to be inspected in a stainless steel barrel filled with oil removal detection liquid for 2-3S, or sprinkling the detection liquid on the surface of the part to be inspected, and then observing the flow condition of the detection liquid on the surface of the module.
S7, judging the condition after oil removal. If the detection liquid is not dispersed rapidly in 3S-5S, the surface of the module achieves the etching effect, the coating requirement of the shell-making slurry is met, and the oil removal is qualified; otherwise, if the detection liquid on the surface of the wax pattern is rapidly dispersed in 3S-5S, the oil removal is unqualified.
Example 1:
the high pressure turbine has large bending and twisting of the working vane and large curvature of the section curve of the vane shape, and the main components of the surface layer are quick-drying silica sol and zircon powder for ensuring the manufacturing manufacturability, wherein SiO in the silica sol 2 The mass fraction is selected to be 10-35%, and the specific surface area of the particles is 50-50 m 2 /g～400m 2 The particle size is generally 5nm to 100 nm. In the actual production process, as the blade body area of the blade is large, the edge plate switching part is an acute angle, dead angles are easy to appear in the liquid flowing process, the fluctuation of oil removal quality is large, the final surface quality of castings is poor, and the qualification rate is low.
To above problem, carry out the deoiling inspection to this foundry goods module, 1, confirm composition and raw materials: and determining that the oil removal detection liquid is the surface layer slurry silica sol and wetting agent corresponding to the binder by combining the part structure. Removing zircon powder in a shell making process surface layer, and selecting silica sol and a wetting agent according to the sol: wetting agent = 1: and 5%o (volume ratio) of a wetting agent is measured to prepare a detection liquid. 2. Preparing a detection solution: selecting a stainless steel barrel with phi 420mm multiplied by 400mm as a container according to the height of the module, pouring 25Kg of silica sol into the prepared stainless steel barrel, and according to the silica sol: wetting agent = 1: and 5 per mill (volume ratio), weighing 125g of wetting agent by using a measuring cylinder, pouring the wetting agent into the measuring cylinder, stirring the mixture evenly, standing the mixture, and waiting for the disappearance of a large number of bubbles on the surface of the liquid for later use. 3. And (5) carrying out quality confirmation on the surfaces of the selected four groups of modules, and removing superfluous matters such as wax scraps, water stains and the like. 4. Carrying out an oil removal condition test, placing the module A to be inspected in a stainless steel barrel filled with oil removal detection liquid for 2S-3S, observing that the detection liquid is not rapidly dispersed in 3S-5S, indicating that the oil removal on the surface of the module A is thorough, and meeting the shell manufacturing requirement; and then placing the module B in a stainless steel barrel filled with oil removal detection liquid for 2-3S, observing that the detection liquid is rapidly dispersed in 3-5S, indicating that oil removal on the surface of the module B is incomplete, and not meeting the shell making requirement, and comparing test result records with the table 1.
TABLE 1
| Module number | Detecting liquid scattering condition | Whether or not to pass |
| A | Not rapidly dispersed in 3S-5S | Qualified product |
| B | Fast dispersion in 3S-5S | Failure to pass |
Example 2:
a large plane and blind holes exist in a high-pressure turbine guide vane of a certain machine, and in order to ensure the manufacturing manufacturability, the main components of a surface layer are silica sol and zircon powder, wherein SiO (silicon oxide) in the silica sol 2 The mass fraction is selected to be 10-25%, and the specific surface area of the particles is 50m 2 /g～300m 2 The particle size is generally 5nm to 100 nm. In the actual production process, as the blade body of the blade has a large plane, and the lower edge plate is provided with a positioning blind hole, dead angles are easy to appear in the liquid flowing process, so that the fluctuation of oil removal quality is large, the final surface quality of castings is poor, and the qualification rate is low.
Aiming at the problems, the oil removal inspection is carried out on the die: 1. determining a detection liquid component 2, and preparing detection liquid corresponding to the part structure according to the proportion. 3. And (5) carrying out quality confirmation on the surfaces of the selected four groups of modules, and removing superfluous matters such as wax scraps, water stains and the like. 4. The oil removal condition test is carried out, the detection liquid is sprayed onto the surface of the module C to be tested, the flow condition of the detection liquid on the surface of the module C is observed, the detection liquid is found to be not scattered rapidly within 3S-5S, the oil removal on the surface of the module C is thorough, and the shell manufacturing requirement is met; sprinkling detection liquid on the surface of the module to be detected D, observing that the detection liquid is not rapidly dispersed in 3S-5S, indicating that the surface of the module D is thoroughly deoiled, and meeting the shell manufacturing requirement; and (3) sprinkling the detection liquid on the surface of the module to be detected E, and observing that the detection liquid is rapidly dispersed in 3S-5S, so that the surface of the module E is not thoroughly degreased, and the shell making requirement is not met. The comparison of the test results is shown in Table 2.
TABLE 2
At present, the method forms an effective file, and is cured in a related production link, and the result shows that after the detection by the method is adopted, detection liquid can be prepared according to the viscosity of the surface coating with different structures, the problem module with incomplete oil removal defect on the surface can be accurately screened, the complaint of the post-process is reduced, the product quality is improved, the problem module can be effectively controlled in the process, and the manufacturing cost is reduced. The quality of the subsequent products was tracked according to the method of the invention, giving tables 3 and 4. Table 3 traces back the casting quality condition table without the detection method, and table 4 traces back the casting quality condition table with the method.
TABLE 3 Table 3
TABLE 4 Table 4
As can be seen from tables 3 and 4, the invention is adopted to carry out module control, and the quality of the subsequent casting products is obviously improved. Meanwhile, the invention has certain generalizability without aiming at specific materials, structures and fields:
(1) Besides the silica sol shell-making material, the invention can also be applied to the inspection of the surface quality of the module of the shell with a specific structure formed by other binders.
(2) Besides the aeroengine investment casting industry, the invention can also be applied to the surface quality inspection of universal modules in the military and civil fusion industry or other civil investment casting industries.
The present invention is written according to specific preferred embodiments, and the specific embodiments of the invention are not to be considered as limited to the description, but rather a number of simple deductions and substitutions can be made by those skilled in the art without departing from the general inventive concept, and the scope of the invention is to be considered as defined in the claims to which the invention pertains.
Claims (6)
1. The method for checking the oil removal quality of the module is characterized by comprising the following steps of:
s1, according to SiO in silica sol 2 Judging the viscosity range of the oil removal detection liquid and the applicability of the specific structural parts according to the mass fraction, the specific surface area of particles and the particle size range;
s2, according to SiO 2 Judging the surface quality of the module according to the mass fraction, the specific surface area of particles and the particle size range;
s3, determining a test research object of the oil removal detection liquid;
s4, preparing oil removal detection liquid;
s5, cleaning the surface of the module to be detected;
s6, placing the module to be inspected in the oil removal detection liquid for 2-3S, or sprinkling the oil removal detection liquid on the surface of the module to be inspected for oil removal;
s7, judging the condition after oil removal, if the oil removal detection liquid is not dispersed in 3-5S, indicating that the surface of the module achieves the etching effect, and meeting the coating requirement of shell making slurry, and ensuring that the oil removal is qualified; if the oil removal detection liquid spreads in 3S-5S, the oil removal is unqualified.
2. The method for detecting the oil removal quality of the module according to claim 1, wherein in the step S1, silica sol and a wetting agent are selected as main components of the oil removal detection liquid.
3. The method for inspecting the degreasing quality of a module according to claim 2, wherein the volume ratio of the silica sol to the wetting agent is 1:5%o.
4. A method for testing the degreasing quality of a module according to claim 1, wherein in S3, the test subject uses a large kink profile, a large planar wax module or a part having a structure with an inner cavity and a blind hole.
5. The method for detecting the oil removal quality of the module according to claim 1, wherein in the step S4, 25Kg of silica sol is mixed with 125g of wetting agent, stirred uniformly and then stood, and after a large amount of bubbles on the surface of the liquid disappear, the preparation of the oil removal detection liquid is completed.
6. The method according to claim 1, wherein in S5, if there is a surplus on the surface of the module to be inspected, the module is cleaned by blowing compressed air.
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