CN108838330A - A kind of method for repairing and mending of evaporative pattern - Google Patents
A kind of method for repairing and mending of evaporative pattern Download PDFInfo
- Publication number
- CN108838330A CN108838330A CN201810863897.9A CN201810863897A CN108838330A CN 108838330 A CN108838330 A CN 108838330A CN 201810863897 A CN201810863897 A CN 201810863897A CN 108838330 A CN108838330 A CN 108838330A
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- CN
- China
- Prior art keywords
- mending
- repairing
- evaporative pattern
- polyvinyl butyral
- paste
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a kind of method for repairing and mending of evaporative pattern, which includes the following steps：(1) evaporative pattern is placed on station, dips in the rejected region that acetone cleans evaporative pattern with absorbent cotton；(2) polyvinyl butyral and polyvinyl acetate emulsion are mixed, obtains mending paste cream；(3) mending paste is coated in the rejected region, smoothed out, stand 20-30min；Wherein, the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:1.5-4.The method for repairing and mending for carrying out evaporative pattern using the modification cream is easy to operate, and the excellent bonding performance with evaporative pattern, repairing time of repose is short, has very high practical value.
Description
Technical field
The present invention relates to the repairings of casting evaporative pattern, and in particular, to a kind of method for repairing and mending of evaporative pattern.
Background technique
Lost foam casting is one of current casting technique state-of-the-art in the world, the primary " leather being known as in casting history
Life " is referred to as 21 century Green foundry both at home and abroad.Lost foam casting process Introduction on Principle：Lost foam casting is in casting process
In, model gasification disappears, and apperance when model is exactly moulding.Apperance is taken out in sand casting, pours into gold in the cavities
Belong to liquid and forms casting.And lost foam casting is that apperance is made using specific foamed plastics, is then embedded in molding sand (general
For dry sand or contain the dry sand of bonding agent), by certain processing (mainly vibrating and take out negative pressure), molten metal is being poured into, gold
Belonging to liquid makes the apperance of foamed plastics gradually soften, liquefy, decompose and gasify, and until substituting bubbles model completely, forms model
The cavity of formation -- casting.Therefore, lost foam casting is also referred to as gasified pattern casting, cavityless casting, casts without type chamber.
The type chamber of mold for lost foam casting, lost foam casting is formed by model, therefore, the quality of final part
It will be dependent on the quality of model.And model is produced with molding die, therefore, the quality of molding die determines model
Quality, to finally determine the quality of the part of production.Understand from this relationship, we are just not difficult to find out that molding die is disappearing
Effect and irreplaceable position in lost pattern casting production.
Lost foam casting has some basic requirements to mold design：
(1) mold has to comply with the requirement of cast shape, size and surface roughness.
(2) structure is simple, convenient for manufacture, repairs easy to maintain.
And in making white mold process, it inevitably will appear the defect in bonding gap and die surface, it can be straight if do not repaired
Connect the precision for influencing casting.And currently repair general factory and use with adhesive tape and with blank sheet of paper, and can be left a trace with the above material, shadow
Surface finish of casting is rung, and it is big with gas forming amount to be difficult to gasify using other mending pastes, and penetrating odor is big, this technology
It is to invent a kind of novel mending paste, the above problem can be avoided very well.
Summary of the invention
The object of the present invention is to provide a kind of evaporative pattern mending pastes and the method for repairing and mending of evaporative pattern, the mending paste to be easy to gas
Change, the mold repaired using the mending paste will not be left a trace after pouring on casting, and cast(ing) surface is bright and clean, and the mending paste
Gas forming amount pinprick smell is small, more environmentally friendly.Moreover, the cost of material of the mending paste is low, and preparation method is simple, repairing
When it is easy to operate, be highly susceptible to promoting.The method for repairing and mending for carrying out evaporative pattern using the modification cream is easy to operate, the knot with evaporative pattern
It is good to close performance, repairing time of repose is short, has very high practical value.
To achieve the goals above, the present invention provides a kind of evaporative pattern mending paste, the mending paste includes polyethylene
Butyral and polyvinyl acetate emulsion, wherein the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:
1.5-4。
The present invention also provides a kind of preparation method of evaporative pattern mending paste, the preparation method includes previously described poly-
The step of proportion of vinyl butyral and polyvinyl acetate emulsion is mixed.
The present invention also provides a kind of method repaired with mending paste to evaporative pattern using previously described evaporative pattern, institutes
Method for repairing and mending is stated to include the following steps：
(1) evaporative pattern is placed on station, dips in the rejected region that acetone cleans evaporative pattern with absorbent cotton；
(2) polyvinyl butyral and polyvinyl acetate emulsion are mixed, obtains mending paste cream；
(3) mending paste is coated in the rejected region, smoothed out, stand 20-30min；
Wherein, the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:1.5-4.
Through the above technical solutions, mending paste of the invention is easy to gasify, the mold repaired using the mending paste is being poured
After will not leave a trace on casting, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, more environmentally friendly.
Moreover, the cost of material of the mending paste is low, and preparation method is simple, and when repairing is easy to operate, is highly susceptible to promoting.Using this
The method for repairing and mending for modifying cream progress evaporative pattern is easy to operate, and the excellent bonding performance with evaporative pattern, repairing time of repose is short, has very
High practical value.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of evaporative pattern mending paste, the mending paste includes polyvinyl butyral and poly-vinegar acid second
Alkene lotion, wherein the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:1.5-4.
Through the above technical solutions, mending paste of the invention is easy to gasify, the mold repaired using the mending paste is being poured
After will not leave a trace on casting, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, more environmentally friendly.
Moreover, the cost of material of the mending paste is low, and preparation method is simple, and when repairing is easy to operate, is highly susceptible to promoting.Using this
The method for repairing and mending for modifying cream progress evaporative pattern is easy to operate, and the excellent bonding performance with evaporative pattern, repairing time of repose is short, has very
High practical value.
In a kind of preferred embodiment of the present invention, it is easy to gasify in order to obtain, the mold repaired using the mending paste
It will not leave a trace on casting after pouring, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, compares
The mending paste of environmental protection, it is preferable that polyvinyl acetate emulsion is strength milky white adhesive (RF701), I type of milky white adhesive (RF601), milky white
One of II type of glue is a variety of.
In a kind of preferred embodiment of the present invention, it is easy to gasify in order to obtain, the mold repaired using the mending paste
It will not leave a trace on casting after pouring, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, compares
The mending paste of environmental protection, it is preferable that the number-average molecular weight of polyvinyl butyral is from 30k-45k.
In a kind of preferred embodiment of the present invention, it is easy to gasify in order to obtain, the mold repaired using the mending paste
It will not leave a trace on casting after pouring, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, compares
The mending paste of environmental protection, it is preferable that the mending paste is made of polyvinyl butyral and polyvinyl acetate emulsion.
In a kind of preferred embodiment of the present invention, it is easy to gasify in order to obtain, the mold repaired using the mending paste
It will not leave a trace on casting after pouring, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, compares
The mending paste of environmental protection, it is preferable that be calculated in mass percent, polyvinyl butyral accounts for 65%-80%.
In a kind of preferred embodiment of the present invention, it is easy to gasify in order to obtain, the mold repaired using the mending paste
It will not leave a trace on casting after pouring, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, compares
The mending paste of environmental protection, it is preferable that be calculated in mass percent, polyvinyl butyral accounts for 70%-75%.
The present invention also provides a kind of preparation method of evaporative pattern mending paste, the preparation method includes previously described poly-
The step of proportion of vinyl butyral and polyvinyl acetate emulsion is mixed.
Through the above technical solutions, mending paste of the invention is easy to gasify, the mold repaired using the mending paste is being poured
After will not leave a trace on casting, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, more environmentally friendly.
Moreover, the cost of material of the mending paste is low, and preparation method is simple, and when repairing is easy to operate, is highly susceptible to promoting.Using this
The method for repairing and mending for modifying cream progress evaporative pattern is easy to operate, and the excellent bonding performance with evaporative pattern, repairing time of repose is short, has very
High practical value.
The present invention also provides a kind of method repaired with mending paste to evaporative pattern using previously described evaporative pattern, institutes
Method for repairing and mending is stated to include the following steps：
(1) evaporative pattern is placed on station, dips in the rejected region that acetone cleans evaporative pattern with absorbent cotton；
(2) polyvinyl butyral and polyvinyl acetate emulsion are mixed, obtains mending paste cream；
(3) mending paste is coated in the rejected region, smoothed out, stand 20-30min；
Wherein, the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:1.5-4.
Through the above technical solutions, mending paste of the invention is easy to gasify, the mold repaired using the mending paste is being poured
After will not leave a trace on casting, cast(ing) surface is bright and clean, and the mending paste gas forming amount pinprick smell is small, more environmentally friendly.
Moreover, the cost of material of the mending paste is low, and preparation method is simple, and when repairing is easy to operate, is highly susceptible to promoting.Using this
The method for repairing and mending for modifying cream progress evaporative pattern is easy to operate, and the excellent bonding performance with evaporative pattern, repairing time of repose is short, has very
High practical value.
The present invention will be described in detail by way of examples below.
Embodiment 1
The method for repairing and mending of evaporative pattern, method for repairing and mending include the following steps：
(1) dust of cleaning evaporative pattern fault location is blown off with hair dryer, then evaporative pattern is placed on station, uses degreasing
Cotton dips in the rejected region of acetone cleaning evaporative pattern；
(2) polyvinyl butyral and I type polyvinyl acetate emulsion of milky white adhesive that number-average molecular weight is 30K are mixed
It closes, obtains mending paste；Wherein, it is calculated in mass percent, polyvinyl butyral accounts for 75%, I type poly vinyl acetate emulsion of milky white adhesive
Liquid accounts for 25%；
(3) mending paste is coated in the rejected region, smoothed out, stand 25min.
Embodiment 2
The method for repairing and mending of evaporative pattern, method for repairing and mending include the following steps：
(1) dust of cleaning evaporative pattern fault location is blown off with hair dryer, then evaporative pattern is placed on station, uses degreasing
Cotton dips in the rejected region of acetone cleaning evaporative pattern；
(2) polyvinyl butyral and I type polyvinyl acetate emulsion of milky white adhesive that number-average molecular weight is 45K are mixed
It closes, obtains mending paste；Wherein, it is calculated in mass percent, polyvinyl butyral accounts for 65%, I type poly vinyl acetate emulsion of milky white adhesive
Liquid accounts for 35%；
(3) mending paste is coated in the rejected region, smoothed out, stand 20min.
Embodiment 3
The method for repairing and mending of evaporative pattern, method for repairing and mending include the following steps：
(1) dust of cleaning evaporative pattern fault location is blown off with hair dryer, then evaporative pattern is placed on station, uses degreasing
Cotton dips in the rejected region of acetone cleaning evaporative pattern；
(2) polyvinyl butyral and I type polyvinyl acetate emulsion of milky white adhesive that number-average molecular weight is 30K are mixed
It closes, obtains mending paste；Wherein, it is calculated in mass percent, polyvinyl butyral accounts for 80%, I type poly vinyl acetate emulsion of milky white adhesive
Liquid accounts for 20%；
(3) mending paste is coated in the rejected region, smoothed out, stand 30min.
By the pouring molten steel of the ZGCr25Ni20 trade mark in the evaporative pattern that Application Example 1-3 is repaired, find after pouring not
It can leave a trace on casting, cast(ing) surface is bright and clean, and the casting defects such as no shrinkage porosite, stomata occur, and illustrates mending paste of the invention
Gas forming amount is small.In casting process, penetrating odor is smaller, illustrates, illustrates that mending paste penetrating odor of the invention is small, compares
Environmental protection.As described above, excellent bonding performance with evaporative pattern easy to operate using the method for repairing and mending that the modification cream carries out evaporative pattern,
It is short to repair time of repose, there is very high practical value.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (7)
1. a kind of method for repairing and mending of evaporative pattern, which is characterized in that the method for repairing and mending includes the following steps：
(1) evaporative pattern is placed on station, dips in the rejected region that acetone cleans evaporative pattern with absorbent cotton；
(2) polyvinyl butyral and polyvinyl acetate emulsion are mixed, obtains mending paste cream；
(3) mending paste is coated in the rejected region, smoothed out, stand 20-30min；
Wherein, the mass ratio of polyvinyl acetate emulsion and polyvinyl butyral is 1:1.5-4.
2. method for repairing and mending according to claim 1, wherein polyvinyl acetate emulsion be strength milky white adhesive (RF701), cream
One of I type of white glue (RF601), II type of milky white adhesive are a variety of.
3. method for repairing and mending according to claim 1, wherein the number-average molecular weight of polyvinyl butyral is from 30k-45k.
4. method for repairing and mending according to claim 1-3, wherein the mending paste is by polyvinyl butyral and gathers
Acetate emulsion composition.
5. method for repairing and mending according to claim 4, wherein be calculated in mass percent, polyvinyl butyral accounts for 65%-
80%.
6. method for repairing and mending according to claim 5, wherein be calculated in mass percent, polyvinyl butyral accounts for 70%-
75%.
7. method for repairing and mending according to claim 4, wherein with absorbent cotton dip in acetone clean the rejected region of evaporative pattern with
Before, further include the steps that clearing up the dust of rejected region with hair dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863897.9A CN108838330B (en) | 2018-08-01 | 2018-08-01 | Repairing method of lost foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863897.9A CN108838330B (en) | 2018-08-01 | 2018-08-01 | Repairing method of lost foam |
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| Publication Number | Publication Date |
|---|---|
| CN108838330A true CN108838330A (en) | 2018-11-20 |
| CN108838330B CN108838330B (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810863897.9A Active CN108838330B (en) | 2018-08-01 | 2018-08-01 | Repairing method of lost foam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451441A (en) * | 2020-04-30 | 2020-07-28 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451441A (en) * | 2020-04-30 | 2020-07-28 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
| CN111451441B (en) * | 2020-04-30 | 2021-11-12 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
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| CN108838330B (en) | 2020-06-16 |
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