CN106141106A - The coating method of the coating of metal casting mould and this metal casting mould - Google Patents
The coating method of the coating of metal casting mould and this metal casting mould Download PDFInfo
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- CN106141106A CN106141106A CN201510148445.9A CN201510148445A CN106141106A CN 106141106 A CN106141106 A CN 106141106A CN 201510148445 A CN201510148445 A CN 201510148445A CN 106141106 A CN106141106 A CN 106141106A
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- casting mould
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Abstract
The invention provides coating method and this metal casting mould of the coating of metal casting mould.Wherein, the method includes: according to the shape and size of foundry goods, vertically, and the whole internal chamber wall of metal casting mould is divided into multiple region；And be respectively applied the coating with different thermal impedances on multiple regions, so that foundry goods the most sequentially coagulation forming in metal casting mould；Wherein, for two the most adjacent regions, it is applied to the thermal impedance of coating that is positioned on the region of the lower position thermal impedance less than the coating being applied on the region of position above.By using the said method of the present invention, it is possible to effectively eliminate foundry goods Shrinkage cavity in process of setting.
Description
Technical field
The present invention relates to permanent mold casting field, particularly relate to coating method and this gold of the coating of metal casting mould
Genotype casting mould.
Background technology
For existing permanent mold casting, due to by using air-cooled and water-cooled traditional approach to realize casting
Part solidification in metal casting mould, therefore cost is of a relatively high, and is difficult to control to foundry goods in metal casting modeling
Consecutive solidification in tool, and the problem that centre-line shrinkage and shrinkage porosite often occur.
For permanent mold casting, control suitable in metal casting mould of foundry goods by convenient, efficient method
Sequence solidifies, and eliminates the defect of the shrinkage cavity shrinkage porosity of foundry goods, for improving the quality of foundry goods, expands metal casting mould
The scope of application be significant.
Summary of the invention
In view of the above problems, object of the present invention is to provide a kind of metal casting mould coating coating method with
And this metal casting mould.The coating method of the coating of the metal casting mould of the present invention and this metal casting modeling
Tool design is simple, easily realizes, and cost is relatively low, can solve the defect of Shrinkage cavity on Metal mould casting easily
Problem.
According to an aspect of the invention, it is provided the coating method of the coating of a kind of metal casting mould, described method
Including:
According to the shape and size of foundry goods, vertically, the whole internal chamber wall of described metal casting mould is divided into
Multiple regions；And
The plurality of region is respectively applied the coating with different thermal impedances, so that described foundry goods is at described gold
The most sequentially coagulation forming in genotype casting mould；
Wherein, in described two vertically adjacent regions, being applied to be positioned on the region of lower position
The thermal impedance of coating less than the thermal impedance of coating being applied on the region of position above.
Additionally, each described region meets below equation (1) along the height of described vertical direction:
H=a × M, wherein M=V/SA (1)
Wherein, a is coefficient and 0 < a≤1.6, and h represents the height in described region, and M represents that described foundry goods will be with described
The modulus of the part of area contact, V represents that described foundry goods will be with the volume of the part of described area contact, and SA represents
The surface area in described region.
Be applied to described in additionally, the thermal impedance of coating that is positioned on the region of lower position with described coated in place
Relation between the thermal impedance of the coating on region at top position meets below equation (2):
RTL=b × RTU (2)
Wherein, b is coefficient and 0 <b≤0.78, RTL represent described in be applied to be positioned on the region of lower position
The thermal impedance of coating, and RTU represent described in the thermal impedance of coating that is applied on the region of position above
Value.
Additionally, when the described internal chamber wall of described metal casting mould there are the portion corresponding with the thick wall part of foundry goods
Timesharing, each region in the described part corresponding with the thick wall part of foundry goods meets institute along the height of described vertical direction
State equation (1), and the span of described coefficient a is partial to its lower limit.
Additionally, when the described internal chamber wall of described metal casting mould there are the district corresponding with the middle subdivision of foundry goods
During territory, the thermal impedance being coated in the coating on the described region corresponding with the middle subdivision of foundry goods meets described equation
, and the span of described coefficient b is partial to its higher limit (2).
Additionally, the size of the thermal impedance of described coating is come certainly according to the coefficient of heat conduction of the heat retaining and exothermal material in coating
Fixed, when the described coefficient of heat conduction of described heat retaining and exothermal material is big, the thermal impedance of described coating is little；When described insulation
The described coefficient of heat conduction hour of pyrogen, the thermal impedance of described coating is big.
Additionally, the size of the thermal impedance of described coating determines according to the thickness of described coating, the thickness of described coating is more
Thickness, the thermal impedance of described coating is the biggest.
Additionally, be coated with application layer on regional by brushing mode or spraying method.
According to another aspect of the present invention, it is provided that a kind of metal casting mould, described metal casting mould has
Use the coating that the coating method of the present invention applies.
Metal casting mould owing to being made of metal has the thermophysical property of little thermal impedance, and relative to metal
For casting die, coating has big thermal impedance, and therefore metal casting mould can be controlled by being coated with application layer
The heat transfer solidification of foundry goods processed and cooling procedure subsequently, but also when can be controlled the solidification of foundry goods by painting application layer
Between.
By using the coating method of the coating of the metal casting mould of the present invention, it is possible to make foundry goods at this metal pattern die
The most sequentially coagulation forming in tool, thus easily and effectively solve foundry goods Shrinkage cavity in process of setting
Defect problem.
The present invention is mainly suitable for metal casting mould, be particularly suited for metal gravity casting die and tilted casting mould
Tool.
Accompanying drawing explanation
Fig. 1 shows the flow chart of the coating method of the coating of metal casting mould according to an embodiment of the invention；
Fig. 2 shows the cross section view of the first example of metal casting mould according to an embodiment of the invention；And
Fig. 3 shows the cross section view of the second example of metal casting mould according to an embodiment of the invention.
Detailed description of the invention
Describe below with reference to the accompanying drawings according to various embodiments of the present invention.
Fig. 1 shows the flow chart of the coating method of the coating of metal casting mould according to an embodiment of the invention.
As it is shown in figure 1, first, in step S101, according to the shape and size of foundry goods, vertically, by metal mold
The whole internal chamber wall of casting mould is divided into multiple region.The internal chamber wall of metal casting mould refers to metal casting mould
Will be with the inner surface for forming the part that the molten metal of foundry goods contacts, i.e. metal casting mould.
Each region height vertically meets below equation (1):
H=a × M, wherein M=V/SA (1)
Wherein, a is coefficient and 0 < a≤1.6, and h represents the height in this region, and M represents that foundry goods will be with this area contact
The modulus of part, V represents that foundry goods will be with the volume of the part of this area contact, and SA represents the face, surface in this region
Long-pending.
Then, in step S102, the multiple regions divided are respectively applied the coating with different thermal impedances
(that is, dope layer), so that foundry goods the most sequentially coagulation forming in metal casting mould.
Specifically, for two the most adjacent regions, it is applied to be positioned on the region of lower position
The thermal impedance of coating is less than the thermal impedance of the coating being applied on the region of position above.
In other words, the coating on the bottom section of the internal chamber wall being applied to metal casting mould has minimum thermal resistance
Anti-value, then to lower and on be applied to metal casting mould successively internal chamber wall regional on the thermal resistance of coating
Anti-value is incremented by successively, is applied to the painting in the top area (that is, emitting port area) of the internal chamber wall of metal casting mould
Layer has the highest thermal impedance.
For two the most adjacent regions, it is applied to the heat of the coating being positioned on the region of lower position
Relation between resistance value and the thermal impedance of coating being applied on the region of position above meets below equation
(2):
RTU=b × RTL (2)
Wherein, b is coefficient and 0 <b≤0.78, and RTL represents the coating being applied to be positioned on the region of lower position
Thermal impedance, and RTU represents the thermal impedance of the coating on the region being applied to position above.
Above-mentioned formula (2) is calculated by heat transfer formula and goes out.According to the calculating of heat transfer formula, the gap of less than 0.78 times can
Preferably to pull open the heat transfer time of the coating on upper area and the coating on lower zone, thus conveniently realize foundry goods
Consecutive solidification.
The thermal impedance of coating is the ermal physics attribute of coating, decides the speed of the heat transfer rate of coating.Application has not
The coating of same thermal impedance is coated, and can control the heat transfer rate of the different parts of foundry goods, thus control foundry goods
Setting rate, to realize the consecutive solidification of foundry goods.
The size of the thermal impedance of coating can be come according to the coefficient of heat conduction of the heat retaining and exothermal material in the coating for applying
Determine.When the coefficient of heat conduction of the heat retaining and exothermal material in coating is big, the thermal impedance of coating is little.As the guarantor in coating
The coefficient of heat conduction hour of temperature pyrogen, the thermal impedance of coating is big.
Generally, use graphite as the heat retaining and exothermal material in coating.Can be big by controlling the granule of the graphite in coating
Little control its coefficient of heat conduction.When the granule of graphite is big, its coefficient of heat conduction is little.Otherwise, when the granule of graphite is little
Time, its coefficient of heat conduction is big.Therefore, use and there is the heat retaining and exothermal material of different granular sizes to make coating, institute
The size of the thermal impedance of the coating obtained is the most different.
The heat retaining and exothermal material that may be used for controlling the size of thermal impedance is not limited thereto the graphite given by place, it is possible to
To use the heat retaining and exothermal material of other any sizes that can control thermal impedance to regulate the big of the thermal impedance of coating
Little.
It addition, the size of the thermal impedance of coating can also determine according to the thickness of coating.The thickness of coating is the thickest, is coated with
The thermal impedance of layer is the biggest.
Additionally, be typically coated with application layer on regional by brushing mode or spraying method.And, general by brush
Painting mode or spraying method are coated with application layer the most successively on regional, i.e. from the little coating of thermal impedance successively
It is applied to the coating that thermal impedance is big.But, the invention is not limited on regional, be coated with spreading the most successively
Layer, it is also possible to be coated with application layer the most successively on regional, or at random coating is corresponding on regional
Coating.
In foundry goods, have the special construction of heavy wall, middle subdivision etc. unavoidably.Special for heavy wall, middle subdivision etc.
The process of structure, is usually the heavy wall pipe neutron partially solidified required time calculating foundry goods according to heat transfer formula, thus
Determine the thermal impedance of the coating in region corresponding with subdivision in the heavy wall pipe of foundry goods in the internal chamber wall of metal casting mould
Value.
When the internal chamber wall of metal casting mould there are the part corresponding with the thick wall part of foundry goods, with foundry goods
Each region in the part that thick wall part is corresponding height vertically meets above-mentioned equation (1).It is preferred that it is right
The span of the coefficient a in thick wall part, equation (1) is partial to its lower limit.
Additionally, when the internal chamber wall of metal type dies there are the region corresponding with the middle subdivision of foundry goods, be coated in
The thermal impedance of coating region on corresponding with the middle subdivision of foundry goods meets above-mentioned equation (2).Due to middle subdivision
Heat-sinking capability poor, it is thus preferable to, for middle subdivision, the span deflection of the coefficient b in equation (2)
Its higher limit.
Fig. 2 shows the cross section view of the first example of metal casting mould according to an embodiment of the invention.
As in figure 2 it is shown, the metal casting mould 200 of the first example is by bottom metal casting die 201, left side metal
Casting die 202 and the right metal casting mould 203 form.By foundry goods main element 204 and single riser feature 205 structure
The foundry goods become is by bottom metal casting die 201, left side metal casting mould 202 and the right metal casting mould
Coagulation forming in 203 inner chambers surrounded.
As in figure 2 it is shown, in this first example, according to the shape and size of foundry goods, metal casting mould 200 whole
Internal chamber wall is divided into bottom section the 210, first border region the 220, second edge district the most successively
Territory the 230, the 3rd border region 240 and emit port area 250.
Bottom section 210 is coated with base coat, the first border region 220 is coated with the first edge and is coated with
Layer, is coated with the second edge coating in the second border region 230, is coated with the 3rd in the 3rd border region 240
Edge coating, and it is coated with rising head coating in port area 250 emitting.
Bottom section the 210, first border region the 220, second border region 230 and the height of the 3rd border region 240
It is 1.2 × M.In this first example, casting modulus M can be approximated to be the width D of foundry goods.Emit port area 250
Height be the whole height emitting port area 250.
The thermal impedance of the base coat being applied on bottom section 210 is 0.0048m2KW-1。
The thermal impedance of the first edge coating being applied in the first border region 220 is 0.0065m2KW-1, with bottom
Multiple between the thermal impedance of coating is less than 0.78.
The thermal impedance of the second edge coating being applied in the second border region 230 is 0.0084m2KW-1, with first
Multiple between the thermal impedance of edge coating is less than 0.78.
The thermal impedance being applied to the 3rd edge coating in the 3rd border region 240 is 0.014m2KW-1, with second
Multiple between the thermal impedance of edge coating is less than 0.78.
The thermal impedance being applied to emit the rising head coating in port area 250 is 0.02m2KW-1, with the 3rd edge coating
Multiple between thermal impedance is less than 0.78.
Fig. 3 shows the cross section view of the second example of metal casting mould according to an embodiment of the invention.
As it is shown on figure 3, the metal casting mould 300 of the second example is by quiet type metal casting mould 301, ejector half metal
Casting die 302 and neutron metal casting mould 303 form.By foundry goods main element 304 and single riser feature 305 structure
The foundry goods become is by quiet type metal casting mould 301, ejector half metal casting mould 302 and neutron metal casting mould
Coagulation forming in 303 inner chambers surrounded.
As it is shown on figure 3, in this second example, according to the shape and size of foundry goods, metal casting mould 300 whole
Internal chamber wall is divided into bottom section 310, middle subregion the 320, first border region the most successively
330, the second border region the 340, the 3rd border region the 350, the 4th border region 360 and emit port area 370.
Bottom section 310 is coated with base coat, middle subregion 320 is coated with neutron coating, first
It is coated with the first edge coating in border region 330, the second border region 340 is coated with the second edge coating,
3rd border region 350 is coated with the 3rd edge coating, the 4th border region 360 is coated with the 4th edge
Coating, and it is coated with rising head coating in port area 370 emitting.
The height of bottom section 310 is 1.2 × M0, wherein, M0The mould of the part that expression foundry goods contacts with bottom section 310
Number.The thermal impedance of the base coat being applied on bottom section 310 is 0.0048m2KW-1。
The height of middle subregion 320 is the height of whole middle subregion 320.The neutron being applied on subregion 320 is coated with
The thermal impedance of layer is 0.0065m2KW-1, and the multiple between the thermal impedance of base coat is less than 0.78.
First border region 330 is the region corresponding with the thick wall part of foundry goods, and its height is 0.8 × M1, wherein, M1
Represent the modulus of the part of foundry goods and the contact of the first border region 330.It is applied to the first limit in the first border region 330
The thermal impedance of portion's coating is 0.0065m2KW-1, and the multiple between the thermal impedance of base coat is less than 0.78.
The height of the second border region 340 is equal to 1.6 × M2, wherein, M2Represent that foundry goods and the second border region 340 contact
The modulus of part.The thermal impedance of the second edge coating being applied in the second border region 340 is 0.0084
m2KW-1, and the multiple between the thermal impedance of the first edge coating is less than 0.78.
The height of the 3rd border region 350 is equal to 0.7 × M3, wherein, M3Represent that foundry goods and the 3rd border region 350 contact
The modulus of part.The thermal impedance being applied to the 3rd edge coating in the 3rd border region 350 is 0.0084
m2KW-1, and the multiple between the thermal impedance of the first edge coating is less than 0.78.
The height of the 4th border region 360 is equal to 1.1 × M4, wherein, M4Represent that foundry goods and the 4th border region 360 contact
The modulus of part.The thermal impedance being applied to the 4th edge coating in the 4th border region 360 is 0.014m2KW- 1, and the multiple between the thermal impedance of the 3rd edge coating is less than 0.78
The height emitting port area 370 is the whole height emitting port area.The rising head coating being applied to emit in port area 370
Thermal impedance is 0.02m2KW-1, and the multiple between the thermal impedance of the 4th edge coating is less than 0.78.
The all numerical value be given in this manual are merely illustrative rather than for limiting the scope of the present invention.
Although through the present invention is described in conjunction with specific embodiments, for the ordinary artisan of this area, root
According to make after mentioned above many to substitute, revise and change to be apparent.Therefore, when such replacement, repair
Change and change when falling within the spirit and scope of appended claims, it should be included in the present invention.
Claims (9)
1. the coating method of the coating of a metal casting mould, it is characterised in that described method includes:
According to the shape and size of foundry goods, vertically, the whole internal chamber wall of described metal casting mould is divided into
Multiple regions；And
The plurality of region is respectively applied the coating with different thermal impedances, so that described foundry goods is at described gold
The most sequentially coagulation forming in genotype casting mould；
Wherein, in described two vertically adjacent regions, being applied to be positioned on the region of lower position
The thermal impedance of coating less than the thermal impedance of coating being applied on the region of position above.
2. the method for claim 1, it is characterised in that each described region is full along the height of described vertical direction
Foot below equation (1):
H=a × M, wherein M=V/SA (1)
Wherein, a is coefficient and 0 < a≤1.6, and h represents the height in described region, and M represents that described foundry goods will be with described
The modulus of the part of area contact, V represents that described foundry goods will be with the volume of the part of described area contact, and SA represents
The surface area in described region.
3. method as claimed in claim 2, it is characterised in that described in be applied to be positioned on the region of lower position
The thermal impedance of coating and the described region being applied to position above on coating thermal impedance between pass
It is to meet below equation (2):
RTL=b × RTU (2)
Wherein, b is coefficient and 0 <b≤0.78, RTL represent described in be applied to be positioned on the region of lower position
The thermal impedance of coating, and RTU represent described in the thermal impedance of coating that is applied on the region of position above
Value.
4. method as claimed in claim 3, it is characterised in that when in the described internal chamber wall of described metal casting mould
When there are the part corresponding with the thick wall part of foundry goods, every in the described part corresponding with the thick wall part of foundry goods
Individual region meets described equation (1) along the height of described vertical direction.
5. method as claimed in claim 3, it is characterised in that when in the described internal chamber wall of described metal casting mould
When there are the region corresponding with the middle subdivision of foundry goods, it is applied to the described district corresponding with the middle subdivision of foundry goods
The thermal impedance of the coating on territory meets described equation (2).
6. the method for claim 1, it is characterised in that the size of the thermal impedance of described coating is according in coating
The coefficient of heat conduction of heat retaining and exothermal material determine,
When the described coefficient of heat conduction of described heat retaining and exothermal material is big, the thermal impedance of described coating is little；
When the described coefficient of heat conduction of described heat retaining and exothermal material is little, the thermal impedance of described coating is big.
7. the method for claim 1, it is characterised in that the size of the thermal impedance of described coating is according to described painting
The thickness of layer determines, the thickness of described coating is the thickest, and the thermal impedance of described coating is the biggest.
8. the method for claim 1, it is characterised in that by brushing mode or spraying method at regional
Upper painting application layer.
9. a metal casting mould, it is characterised in that described metal casting mould has employing such as claim 1
The coating that the coating method described in any one claim in 8 applies.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510148445.9A CN106141106A (en) | 2015-03-31 | 2015-03-31 | The coating method of the coating of metal casting mould and this metal casting mould |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510148445.9A CN106141106A (en) | 2015-03-31 | 2015-03-31 | The coating method of the coating of metal casting mould and this metal casting mould |
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| US20100170654A1 (en) * | 2009-01-06 | 2010-07-08 | General Electric Company | Casting Molds for Use in Directional Solidification Processes and Methods of Making |
| CN102019379A (en) * | 2010-10-26 | 2011-04-20 | 西峡龙成特种材料有限公司 | Environment servo type clean metal mould |
| CN102773409A (en) * | 2012-07-24 | 2012-11-14 | 滁州金诺实业有限公司 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
| CN103231025A (en) * | 2013-04-18 | 2013-08-07 | 西安交通大学 | Preparation method of wall thickness controllable directional solidification casting mould |
| CN103386465A (en) * | 2013-08-21 | 2013-11-13 | 中信戴卡股份有限公司 | Preset temperature field metallic mold |
| CN104209497A (en) * | 2014-09-10 | 2014-12-17 | 山西银光华盛镁业股份有限公司 | Plaster casting method for large-sized complex thin-walled magnesium alloy part |
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2015
- 2015-03-31 CN CN201510148445.9A patent/CN106141106A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284573A (en) * | 1999-08-02 | 2001-02-21 | 住友电气工业株式会社 | Crystal growth container and method |
| US20100170654A1 (en) * | 2009-01-06 | 2010-07-08 | General Electric Company | Casting Molds for Use in Directional Solidification Processes and Methods of Making |
| CN102019379A (en) * | 2010-10-26 | 2011-04-20 | 西峡龙成特种材料有限公司 | Environment servo type clean metal mould |
| CN102773409A (en) * | 2012-07-24 | 2012-11-14 | 滁州金诺实业有限公司 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
| CN103231025A (en) * | 2013-04-18 | 2013-08-07 | 西安交通大学 | Preparation method of wall thickness controllable directional solidification casting mould |
| CN103386465A (en) * | 2013-08-21 | 2013-11-13 | 中信戴卡股份有限公司 | Preset temperature field metallic mold |
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Application publication date: 20161123 |