CN114147174B - 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
- CN114147174B CN114147174B CN202111497701.7A CN202111497701A CN114147174B CN 114147174 B CN114147174 B CN 114147174B CN 202111497701 A CN202111497701 A CN 202111497701A CN 114147174 B CN114147174 B CN 114147174B
- Authority
- CN
- China
- Prior art keywords
- sand
- core
- mold
- beryllium copper
- core box
- 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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- 239000004576 sand Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 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
- 238000007711 solidification Methods 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 75
- 238000000034 method Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 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
- 238000000465 moulding Methods 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
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
Abstract
A coated sand mold hot core box structure for manufacturing a sand core, the hot core box structure comprising: the die comprises a die core box, wherein a die cavity is formed in the die core box, a beryllium copper insert is arranged in the die core box, one end of the beryllium copper insert is flush with the outer plane of the die core box, and the other end of the beryllium copper insert is matched with the inner molded surface of the die cavity. The design not only can stably promote the solidification effect and effectively reduce the probability of sand core collapsibility, but also is easy to maintain and reduces the die loss.
Description
Technical Field
The invention relates to a hot core box structure of a precoated sand mould for manufacturing a sand core, which is particularly suitable for improving the solidification forming effect of the sand core.
Background
In the casting process of the engine, a sand core is needed, and the production and manufacturing quality of the sand core directly influences the casting quality and the later processing amount of the engine.
In the core making process of the hot core box, part of the sand core has complex structure, is thick or is not easy to solidify at a position far away from the injection nozzle, and is easy to collapse after being taken out;
the common solutions to the problems are to raise the heating temperature of the core box, prolong the curing time or add heating needles at the positions which are not easy to cure, and the solutions of the above solutions solve the problem of sand core curing and increase energy consumption at the same time, and reduce the core making and repairing efficiency.
When the core box with the beryllium copper insert is not used for producing the sand core with the similar structure, the thermostat structure is close to the edge of the core box, the heating temperature is lower than that of the central area, the sand core structure is thicker and larger, the sand core is poorly solidified when the heating is insufficient, and the shell layer on the surface of the sand core is easy to fall off or loose sand core is formed; when the sand core is broken in the mould core box (possibly caused by loose sand core, unstable equipment, deterioration of raw materials and the like), the surface of the mould can be damaged when an operator frequently prizes the residual sand core, and the repair is difficult (the surface hardness after repair is low, and the sand is easy to be shot at high temperature).
Disclosure of Invention
The invention aims to solve the problems that the sand core is thick and the weak part is not formed in the prior art, and provides a precoated sand mould hot core box structure for manufacturing the sand core, which does not need to prolong the curing time and utilizes the beryllium copper insert to optimize the forming effect.
In order to achieve the above object, the technical solution of the present invention is:
a coated sand mold hot core box structure for manufacturing a sand core, the hot core box structure comprising: the die comprises a die core box, wherein a die cavity is formed in the die core box, a beryllium copper insert is arranged in the die core box, one end of the beryllium copper insert is flush with the outer plane of the die core box, and the other end of the beryllium copper insert is matched with the inner molded surface of the die cavity.
The beryllium copper insert is arranged on the top and/or bottom plane of a region with the height of the cavity of the die cavity being greater than or equal to 4 cm.
The beryllium copper insert is arranged in a thin-wall area or an annular thin-wall area of the die cavity, the wall thickness of the thin-wall area is smaller than 8mm, and the wall thickness of the annular thin-wall area is smaller than 10 mm.
The beryllium copper insert is arranged in a cavity area with the sectional area smaller than 2 square centimeters in the die cavity.
The top of the mould core box is provided with a plurality of sand shooting holes, and the mould cavity is communicated with the outside of the mould core box through the sand shooting holes.
The sand shooting holes are matched with a sand shooting nozzle of the precoated 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 oppositely arranged up and down, and the single heating couple penetrates through the die core box.
The beryllium copper insert is made of a beryllium copper alloy material of QBe 2.
Compared with the prior art, the invention has the beneficial effects that:
1. in the hot core box structure of the precoated sand mould 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; the beryllium copper has high hardness, elastic limit, fatigue limit and wear resistance, good corrosion resistance and thermal conductivity, does not generate spark when impacted, and is very suitable for manufacturing wear-resistant parts. And the coefficient of heat conductivity 195 w/(m.k) of beryllium copper at 200-300 ℃ (about 300 ℃ of the die heating temperature) is far greater than the coefficient of heat conductivity 50 w/(m.k) of the die core box 1 (HT 250); therefore, aiming at the part of the sand core which is not easy to be solidified, the mold part is replaced by the insert made of the beryllium copper alloy material, and the heat conduction performance of the beryllium copper is far stronger than that of the mold body in the core making process, the insert part can reach the required solidification temperature more quickly, thereby improving the solidification effect and effectively reducing the probability of sand core collapsibility. Therefore, the solidification effect can be stably improved by the design, and the collapse probability of the sand core is effectively reduced.
2. The beryllium copper insert is used in the hot core box structure of the precoated sand mould 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 mould structure (namely adding a heating device), so that the qualified sand core meeting the expectation is obtained. Therefore, the design has small change range and low change cost.
3. The beryllium copper in the hot core box structure of the precoated sand mould for manufacturing the sand core has high hardness and wear resistance, so that the phenomena can be reduced, even if the surface of an insert is seriously damaged, the mould can be repaired by directly replacing the insert, and the production and quality are less affected. Therefore, the design is easy to maintain, and the die loss is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is a schematic perspective view of the present invention.
Fig. 4 is a schematic top 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 die comprises a die core box 1, a beryllium copper insert 11, a sand shooting hole 12, a heating couple 13 and a die cavity 2.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 1, a coated sand mold hot core box structure for manufacturing a sand core, the hot core box structure comprising: the mold comprises a mold core box 1, wherein a mold cavity 2 is formed in the mold core box 1, a beryllium copper insert 11 is arranged in the mold core box 1, one end of the beryllium copper insert 11 is flush with the outer plane of the mold core box 1, and the other end of the beryllium copper insert 11 is matched with the inner molded surface of the mold cavity 2.
The beryllium copper insert 11 is arranged on the top and/or bottom plane of a region with the height of the cavity of the die cavity 2 being more than or equal to 4 cm.
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 smaller than 8mm, and the wall thickness of the annular thin-wall area is smaller 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 mould core box 1 is provided with a plurality of sand shooting holes 12, and the mould cavity 2 is communicated with the outside of the mould core box 1 through the sand shooting holes 12.
The sand shooting holes 12 are matched with a sand shooting nozzle of the precoated sand core making machine.
The die core box 1 is provided with a plurality of groups of heating couples 13, the single group of heating couples 13 are oppositely arranged up and down, and the single heating couple 13 penetrates through the die core box 1.
The beryllium copper insert 11 is made of a beryllium copper alloy material of QBe 2.
The principle of the invention is explained as follows:
the sand shooting plate is directly connected with the sand shooting nozzle of the equipment. When the mold is opened up and down, the back of the upper mold can be used as a sand shooting plate, and a mold nozzle penetrates through the upper mold body and is directly connected with a sand core product, as shown by 9# (a green part in the left picture is a nozzle, and penetrates through the upper mold body as shown in the right picture, and precoated sand is sent into the mold by virtue of pressure during sand shooting); the heating couple 13 penetrates through the front end and the rear end of the die, the positions and the numbers of the couples of the upper die and the lower die are consistent, and the heating couple is resistance type heating, so that the heating temperature of the middle part is 30-50 ℃ higher than that of the two ends as a whole.
The main factors influencing the compactness of the sand core structure are as follows: 1. the sand amount is fed into the mould, and whether the precoated sand can fully fill the structure; 2. the solidification effect is that the precoated sand is essentially scouring sand (quartz silica sand with less mineral impurities), the surface of sand grains is covered with a thermoplastic phenolic resin hard film, the thermoplastic phenolic resin hard film is heated by a mould to soften and adhere the resin, the mould is opened after the moulding, the sand core is taken out, and the finished sand core is finally completely solidified after cooling at room temperature;
because the product has a complex structure, the thin wall position is more on the whole, the thinnest part is less than 8mm, the setting requirements of technological 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 fails in a reaction, the strength of the thin wall part is reduced, and the performance of the casting is finally influenced;
because of the product characteristic requirement, the process parameter is set by considering the compactness of the thin wall position, but the thermostat structure of the product is relatively large, the overall thickness is more than 50mm, the solidification is lower than that of other positions under the same process under the same mold, and the thermostat structure is positioned at the edge of the end face of the mold, the heating temperature is low, and the sand injection pressure is low. Therefore, the insert structure is introduced, the beryllium copper which is a metal with strong heat conduction capacity is used as a material, the heating performance of the local structure is improved on the premise of not adjusting the technological parameters, and the higher the surface temperature is, the better the fluidity is when the sand flows, so the method is also beneficial to the local sand core filling (the whole structure of the thermostat is relatively large, the total amount of the resin is large, the hardness of the sand core structure is not affected by properly improving the temperature, and the reaction is fully facilitated
Example 1:
a coated sand mold hot core box structure for manufacturing a sand core, the hot core box structure comprising: the mold comprises a mold core box 1, wherein a mold cavity 2 is formed in the mold core box 1, a beryllium copper insert 11 is arranged in the mold core box 1, one end of the beryllium copper insert 11 is flush with the outer plane of the mold core box 1, and the other end of the beryllium copper insert 11 is matched with the inner molded surface of the mold cavity 2.
The beryllium copper insert 11 is arranged on the top and/or bottom plane of a region with the height of the cavity of the die cavity 2 being more than or equal to 4 cm.
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 smaller than 8mm, and the wall thickness of the annular thin-wall area is smaller 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 mould core box 1 is provided with a plurality of sand shooting holes 12, and the mould cavity 2 is communicated with the outside of the mould 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 holes 12 are matched with a sand shooting nozzle of the precoated sand core making machine.
The die core box 1 is provided with a plurality of groups of heating couples 13, the single group of heating couples 13 are oppositely arranged up and down, and the single heating couple 13 penetrates through the die core box 1.
The beryllium copper insert 11 is made of a beryllium copper alloy material of QBe 2.
Claims (5)
1. A tectorial membrane sand mould hot core box structure for making psammitolite, its characterized in that:
the hot box structure includes: the mold comprises a mold core box (1), wherein a mold cavity (2) is formed in the mold core box (1), a beryllium copper insert (11) is arranged in the mold core box (1), one end of the beryllium copper insert (11) is flush with the outer plane of the mold core box (1), and the other end of the beryllium copper insert (11) is matched with the inner molded surface of the mold cavity (2); when the mould is opened up and down, the back of the upper mould can be used as a sand shooting plate, and a mould nozzle penetrates through the upper mould body and is directly connected with the sand core part;
the beryllium copper insert (11) is arranged on the top and/or bottom plane of a region with the height of the cavity of the die cavity (2) being more than or equal to 4 cm;
and/or 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 smaller than 8mm, and the wall thickness of the annular thin-wall area is smaller than 10 mm;
and/or 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).
2. A precoated sand mold hot box structure for manufacturing a sand core as claimed in claim 1, characterized in that:
a plurality of sand shooting holes (12) are formed in the top of the die core box (1), and the die cavity (2) is communicated with the outside of the die core box (1) through the sand shooting holes (12).
3. A precoated sand mold hot box structure for manufacturing a sand core as claimed in claim 2, characterized in that:
the sand shooting hole (12) is matched with a sand shooting nozzle of the precoated sand core making machine.
4. A precoated sand mold hot box structure for manufacturing a sand core as claimed in claim 3, characterized in that:
the die core box (1) is provided with a plurality of groups of heating couples (13), the single groups of heating couples (13) are oppositely arranged up and down, and the single heating couples (13) penetrate through the die core box (1).
5. A precoated sand mold hot box structure for manufacturing a sand core as recited in claim 4, wherein:
the beryllium copper insert (11) is made of a beryllium copper alloy material of QBe.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114147174A CN114147174A (en) | 2022-03-08 |
| CN114147174B true CN114147174B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| CN (1) | CN114147174B (en) |
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| 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 |
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| 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 |
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| 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 |
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| CN114147174A (en) | 2022-03-08 |
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