CN114147174A - Hot core box structure of precoated sand mold for manufacturing sand core - Google Patents
Hot core box structure of precoated sand mold for manufacturing sand core Download PDFInfo
- Publication number
- CN114147174A CN114147174A CN202111497701.7A CN202111497701A CN114147174A CN 114147174 A CN114147174 A CN 114147174A CN 202111497701 A CN202111497701 A CN 202111497701A CN 114147174 A CN114147174 A CN 114147174A
- Authority
- CN
- China
- Prior art keywords
- sand
- core
- hot
- beryllium copper
- mould
- Prior art date
- 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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Links
- 239000004576 sand Substances 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims description 26
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 5
- 210000002489 tectorial membrane Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 72
- 238000000034 method Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- B22C7/06—Core boxes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A hot-core box structure for a precoated sand mold for manufacturing a sand core, the hot-core box structure comprising: the mould core box is characterized in that a mould cavity is formed in the mould core box, a beryllium copper insert is arranged in the mould core box, one end of the beryllium copper insert is flush with the outer plane of the mould core box, and the other end of the beryllium copper insert is matched with the inner profile of the mould cavity. The design not only can stably promote the curing effect, effectively reduce the probability of sand core collapse, but also is easy to maintain and reduces the loss of the die.
Description
Technical Field
The invention relates to a hot core box structure of a precoated sand mold for manufacturing a sand core, which is particularly suitable for improving the solidification and forming effects of the sand core.
Background
In the process of casting the engine, a sand core is needed, and the production and manufacturing quality of the sand core directly influences the casting quality of the engine and the later processing amount.
In the core making process of the hot core box, part of the sand core is complex in structure and thick or is not easy to solidify at a position far away from the nozzle, and the sand core is easy to collapse after being taken out;
the common solution to the problems is to raise the heating temperature of the core box, prolong the curing time or add heating needles at positions difficult to cure, and the above solutions can increase the energy consumption and reduce the core making and repairing efficiency while solving the problem of curing the sand core.
When a core box without beryllium copper insert is produced, the thermostat structure is close to the edge of the core box, the heating temperature is lower than that of the central area, the core structure is thick and large, the core is poorly cured when the core is insufficiently heated, and the shell layer on the surface of the core is easy to fall off or loose; when the sand core is broken in the core box of the mold (possibly caused by loose sand core, unstable equipment, raw material deterioration and the like), the surface of the mold can be damaged when an operator frequently picks the residual sand core, and the repair is difficult (the surface has low hardness after welding repair, and the shot sand is easy to be shot at high temperature).
Disclosure of Invention
The invention aims to solve the problems of heavy sand core and no forming of weak parts in the prior art, and provides a precoated sand mold hot core box structure for manufacturing a sand core, which can optimize the forming effect by utilizing a beryllium copper insert without prolonging the curing time.
In order to achieve the above purpose, the technical solution of the invention is as follows:
a hot-core box structure for a precoated sand mold for manufacturing a sand core, the hot-core box structure comprising: the mould core box is characterized in that a mould cavity is formed in the mould core box, a beryllium copper insert is arranged in the mould core box, one end of the beryllium copper insert is flush with the outer plane of the mould core box, and the other end of the beryllium copper insert is matched with the inner profile of the mould cavity.
The beryllium copper insert is arranged on the plane of the top and/or the bottom of an area with the cavity height being more than or equal to 4 cm in the die cavity.
The beryllium copper insert is arranged in a thin-wall area or an annular thin-wall area of a die cavity, the wall thickness of the thin-wall area is less than 8mm, and the wall thickness of the annular thin-wall area is less than 10 mm.
The beryllium copper insert is arranged in a cavity area with the sectional area less than 2 square centimeters in the cavity of the die.
The top of the die core box is provided with a plurality of sand shooting holes, and the die cavity is communicated with the outside of the die core box through the sand shooting holes.
And the sand shooting holes are matched with a sand shooting nozzle of the coated sand core making machine.
The die core box is provided with a plurality of groups of heating couples, the single group of heating couples are arranged in an up-down opposite mode, and a single heating couple penetrates through the die core box.
The beryllium copper insert is made of QBe2 beryllium copper alloy material.
Compared with the prior art, the invention has the beneficial effects that:
1. in the hot core box structure of the precoated sand mold for manufacturing the sand core, the beryllium-copper alloy has good plasticity in a quenching state and can be processed into various semi-finished products; and the beryllium copper has high hardness, elastic limit, fatigue limit and wear resistance, and also has good corrosion resistance and thermal conductivity, does not generate sparks when impacted, and is very suitable for manufacturing wear-resistant parts. The heat conductivity coefficient of the beryllium copper at 200-300 ℃ (the heating temperature of the die is about 300 ℃) is 195w/(m.k) far greater than the heat conductivity coefficient of the die core box 1 (HT 250) 50 w/(m.k); therefore, the part of the mold is replaced by the insert made of beryllium copper alloy material aiming at the part of the sand core which is not easy to cure, and the beryllium copper has the heat-conducting property far stronger than that of the mold body in the core making process, so that the insert part can reach the required curing temperature more quickly, thereby improving the curing effect and effectively reducing the probability of sand core collapse. Therefore, the design can stably improve the curing effect and effectively reduce the probability of sand core collapse.
2. The beryllium copper insert is used in the hot core box structure of the precoated sand mold for manufacturing the sand core, and in the actual production process, the expected heating and curing effect can be achieved without specially adjusting core manufacturing parameters or changing the mold structure (namely adding a heating device), so that the qualified sand core meeting the expectation is obtained. Therefore, the design has small modification range and low modification cost.
3. The beryllium copper in the hot core box structure of the precoated sand mold for manufacturing the sand core has high hardness and wear resistance, so that the phenomena can be reduced, the mold can be repaired by directly replacing the insert even if the surface of the insert is seriously damaged, and the influence on production and quality is small. Therefore, the design is easy to maintain, and the loss of the die is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a sectional view of fig. 1.
Fig. 3 is a schematic perspective view of the present invention.
Fig. 4 is a top schematic view of fig. 3.
Fig. 5 is a schematic view of the installation of the beryllium copper insert of the present invention.
In the figure: the mold comprises a mold core box 1, a beryllium copper insert 11, a sand shooting hole 12, a heating couple 13 and a mold cavity 2.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1-fig. 1, a hot-box structure of a precoated sand mold for manufacturing a sand core, the hot-box structure comprising: the mould core box comprises a mould core box 1, wherein a mould cavity 2 is formed in the mould core box 1, a beryllium copper insert 11 is arranged in the mould core box 1, one end of the beryllium copper insert 11 is flush with the outer plane of the mould core box 1, and the other end of the beryllium copper insert 11 is matched with the inner molded surface of the mould cavity 2.
The beryllium copper insert 11 is arranged on the top and/or bottom plane of an area with the cavity height of more than or equal to 4 centimeters in the die cavity 2.
The beryllium copper insert 11 is arranged in a thin-wall area or an annular thin-wall area of the die cavity 2, the wall thickness of the thin-wall area is less than 8mm, and the wall thickness of the annular thin-wall area is less than 10 mm.
The beryllium copper insert 11 is arranged in a cavity area with the sectional area smaller than 2 square centimeters in the die cavity 2.
The top of the die core box 1 is provided with a plurality of sand shooting holes 12, and the die cavity 2 is communicated with the outside of the die core box 1 through the sand shooting holes 12.
The sand shooting hole 12 is matched with a sand shooting nozzle of the coated sand core making machine.
The die core box 1 is provided with a plurality of groups of heating couples 13, the heating couples 13 in the groups are arranged oppositely up and down, and a single heating couple 13 penetrates through the die core box 1.
The beryllium copper insert 11 is made of QBe2 beryllium copper alloy material.
The principle of the invention is illustrated as follows:
the sand shooting plate is directly connected with the sand shooting nozzle of the device. When the mold is opened up and down, the back of the upper mold can be used as a sand shooting plate, the mold shooting nozzle penetrates through the upper mold body and is directly connected with a sand core part, such as 9# (the green part on the left picture is the shooting nozzle, and penetrates through the upper mold body as shown in the right picture, and the precoated sand is sent into the mold by virtue of the pressure during sand shooting); the heating couples 13 penetrate through the front end and the rear end of the die, the positions and the number of the couples of the upper die and the lower die are arranged consistently, and the heating couples are resistance-type heating, so that the heating temperature of the middle part is integrally higher than that of the two ends by 30-50 ℃.
The main factors influencing the compactness of the sand core structure are as follows: 1. the sand amount is that whether the precoated sand fed into the mold can fully fill the structure at the position; 2. the curing effect is that the essence of the precoated sand is scouring sand (quartz silica sand with less mineral impurities), the surface of the sand is covered with a thermoplastic phenolic resin hard film, the resin is softened and adhered by heating the mould, the mould is opened after forming, the sand core is taken out, and finally the sand core is completely cured after cooling at room temperature to obtain a finished sand core;
the product has a complex structure, the whole thin wall has more positions, the thinnest position is less than 8mm, the setting requirements of process parameters (sand shooting pressure and sand shooting time) are very strict, the adjustable range is small, the curing temperature is not too high, the curing time is not too long, otherwise, the resin is over-reacted and loses efficacy, the strength of the thin wall is reduced, and the performance of a casting is finally influenced;
the product characteristic requirements and the process parameter setting need to consider the compactness of the thin-wall position, but the thermostat structure of the part is relatively large, the whole thickness exceeds 50mm, the solidification is worse than other positions under the same process and the same mould, and the thermostat structure is positioned at the edge of the end face of the mould, the heating temperature is low, and the sand shooting pressure is low. Therefore, an insert structure is introduced, beryllium copper which is metal with strong heat conductivity is used as a material, the heating performance of a local structure is improved on the premise of not adjusting process parameters, and the higher the surface temperature is, the better the fluidity is when sand flows, so that the filling of the local sand core is facilitated (the integral thermostat structure is fat, the total amount of resin is large, the hardness of the sand core structure is not influenced by properly increasing the temperature, but the complete reaction is facilitated)
Example 1:
a hot-core box structure for a precoated sand mold for manufacturing a sand core, the hot-core box structure comprising: the mould core box comprises a mould core box 1, wherein a mould cavity 2 is formed in the mould core box 1, a beryllium copper insert 11 is arranged in the mould core box 1, one end of the beryllium copper insert 11 is flush with the outer plane of the mould core box 1, and the other end of the beryllium copper insert 11 is matched with the inner molded surface of the mould cavity 2.
The beryllium copper insert 11 is arranged on the top and/or bottom plane of an area with the cavity height of more than or equal to 4 centimeters in the die cavity 2.
The beryllium copper insert 11 is arranged in a thin-wall area or an annular thin-wall area of the die cavity 2, the wall thickness of the thin-wall area is less than 8mm, and the wall thickness of the annular thin-wall area is less than 10 mm.
The beryllium copper insert 11 is arranged in a cavity area with the sectional area smaller than 2 square centimeters in the die cavity 2.
The top of the die core box 1 is provided with a plurality of sand shooting holes 12, and the die cavity 2 is communicated with the outside of the die core box 1 through the sand shooting holes 12.
Example 2:
example 2 is substantially the same as example 1 except that:
the sand shooting hole 12 is matched with a sand shooting nozzle of the coated sand core making machine.
The die core box 1 is provided with a plurality of groups of heating couples 13, the heating couples 13 in the groups are arranged oppositely up and down, and a single heating couple 13 penetrates through the die core box 1.
The beryllium copper insert 11 is made of QBe2 beryllium copper alloy material.
Claims (8)
1. The utility model provides a tectorial membrane sand mould hot core box structure for making psammitolite which characterized in that:
the hot box structure includes: the mould core box comprises a mould core box (1), a mould cavity (2) is formed in the mould core box (1), a beryllium copper insert (11) is arranged in the mould core box (1), one end of the beryllium copper insert (11) is flush with the outer plane of the mould core box (1), and the other end of the beryllium copper insert (11) is matched with the inner molded surface of the mould cavity (2).
2. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 1, wherein:
the beryllium copper insert (11) is arranged on the top and/or bottom plane of an area with the cavity height of more than or equal to 4 cm in the die cavity (2).
3. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 1, wherein:
the beryllium copper insert (11) is arranged in a thin-wall area or an annular thin-wall area of the die cavity (2), the wall thickness of the thin-wall area is less than 8mm, and the wall thickness of the annular thin-wall area is less than 10 mm.
4. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 1, wherein:
the beryllium copper insert (11) is arranged in a cavity area with the sectional area smaller than 2 square centimeters in the die cavity (2).
5. The hot box structure of a precoated sand mold for manufacturing a sand core according to claim 1, 2, 3 or 4, wherein:
the top of the die core box (1) is provided with a plurality of sand shooting holes (12), and the die cavity (2) is communicated with the outside of the die core box (1) through the sand shooting holes (12).
6. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 5, wherein:
the sand shooting hole (12) is matched with a sand shooting nozzle of the coated sand core making machine.
7. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 6, wherein:
the die core box (1) is provided with a plurality of groups of heating couples (13), the single groups of heating couples (13) are arranged in an up-down opposite mode, and a single heating couple (13) penetrates through the die core box (1).
8. The hot-box structure of a precoated sand mold for manufacturing a sand core according to claim 7, wherein:
the beryllium copper insert (11) is made of QBe2 beryllium copper alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497701.7A CN114147174B (en) | 2021-12-09 | 2021-12-09 | Hot core box structure of precoated sand mold for manufacturing sand core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497701.7A CN114147174B (en) | 2021-12-09 | 2021-12-09 | Hot core box structure of precoated sand mold for manufacturing sand core |
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| Publication Number | Publication Date |
|---|---|
| CN114147174A true CN114147174A (en) | 2022-03-08 |
| CN114147174B CN114147174B (en) | 2024-01-23 |
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| CN202111497701.7A Active CN114147174B (en) | 2021-12-09 | 2021-12-09 | Hot core box structure of precoated sand mold for manufacturing sand core |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2109487A1 (en) * | 1992-11-06 | 1994-05-07 | Gary D. Helgesen | Method for Preparing an Engine Block Casting Having Cylinder Bore Liners |
| US5368087A (en) * | 1993-12-27 | 1994-11-29 | Ford Motor Company | Hot box core making apparatus |
| KR20020039439A (en) * | 2000-11-21 | 2002-05-27 | 윤용진 | Method for mold manufacture using for beryllium-copper compound metal |
| WO2014002409A1 (en) * | 2012-06-27 | 2014-01-03 | Ｊｆｅスチール株式会社 | Continuous casting mold and method for continuous casting of steel |
| CN203917808U (en) * | 2014-07-09 | 2014-11-05 | 宜昌奥力铸造有限责任公司 | A kind of modular hot box |
| CN204639043U (en) * | 2015-05-18 | 2015-09-16 | 山东泰开精密铸造有限公司 | New-energy automobile list water channel support hot core box mould |
| CN108296441A (en) * | 2018-03-01 | 2018-07-20 | 溧阳市联华机械制造有限公司 | A kind of hot core box mould and sand core forming method extending film covered sand core exhaust passage |
| CN109079107A (en) * | 2018-09-03 | 2018-12-25 | 十堰阳迪模具有限公司 | A kind of heavy truck cylinder body water jacket of engine casting mould |
| CN110340287A (en) * | 2019-07-12 | 2019-10-18 | 十堰天凯模具制造有限公司 | A kind of structure of novel reinforcement casting chaplet box conduction efficiency |
| CN213440769U (en) * | 2020-08-19 | 2021-06-15 | 东莞市高维精密模具有限公司 | Mold magnet discharging structure |
-
2021
- 2021-12-09 CN CN202111497701.7A patent/CN114147174B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2109487A1 (en) * | 1992-11-06 | 1994-05-07 | Gary D. Helgesen | Method for Preparing an Engine Block Casting Having Cylinder Bore Liners |
| US5368087A (en) * | 1993-12-27 | 1994-11-29 | Ford Motor Company | Hot box core making apparatus |
| KR20020039439A (en) * | 2000-11-21 | 2002-05-27 | 윤용진 | Method for mold manufacture using for beryllium-copper compound metal |
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| CN204639043U (en) * | 2015-05-18 | 2015-09-16 | 山东泰开精密铸造有限公司 | New-energy automobile list water channel support hot core box mould |
| CN108296441A (en) * | 2018-03-01 | 2018-07-20 | 溧阳市联华机械制造有限公司 | A kind of hot core box mould and sand core forming method extending film covered sand core exhaust passage |
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| CN110340287A (en) * | 2019-07-12 | 2019-10-18 | 十堰天凯模具制造有限公司 | A kind of structure of novel reinforcement casting chaplet box conduction efficiency |
| CN213440769U (en) * | 2020-08-19 | 2021-06-15 | 东莞市高维精密模具有限公司 | Mold magnet discharging structure |
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| Title |
|---|
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| Publication number | Publication date |
|---|---|
| CN114147174B (en) | 2024-01-23 |
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