CN112605365A - Motor casing low pressure casting cooling system - Google Patents
Motor casing low pressure casting cooling system Download PDFInfo
- Publication number
- CN112605365A CN112605365A CN202011394939.2A CN202011394939A CN112605365A CN 112605365 A CN112605365 A CN 112605365A CN 202011394939 A CN202011394939 A CN 202011394939A CN 112605365 A CN112605365 A CN 112605365A
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- China
- Prior art keywords
- water channel
- annular
- cooling
- cooling water
- motor casing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a low-pressure casting cooling system for a motor casing, which is characterized in that: the mould corresponding to the position of the variable cross section of the water channel of the motor shell is provided with an annular cooling water channel, the mould is provided with a plurality of annular water channels, and each annular water channel is independently connected with a cooling device; and (3) sequentially opening the annular cooling water channels from top to bottom to cool the die, and opening at most two annular cooling water channels simultaneously. The invention can effectively control the cooling process of the casting, has good cooling effect, does not generate the defects of shrinkage porosity, shrinkage cavity and the like, and simultaneously improves the production efficiency. Annular water cooling is arranged in a wall thickness transition area of a casting, particularly a thick and big position, and the annular water cooling and the central water cooling which are independently controlled can effectively ensure that the cooling strength is consistent, so that a foundation is provided for sequential solidification, gas is slowly discharged in a mold filling process, and the gradual internal quality is effectively solved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a low-pressure casting cooling system for a motor casing.
Background
More than 90% of the existing motor shell has a water channel, the thickness difference of the upper wall and the lower wall of a casting is large after the water channel exists, the defects of shrinkage porosity, shrinkage cavity and the like are easily generated at the thick position and the large position for low-pressure casting, if no control means is provided, the defects are difficult to eliminate, and the qualification rate of the casting is difficult to promote.
On the other hand, the process beat is prolonged due to the existence of the water channel, and the design of the annular water channel for solving the problem of shrinkage porosity and reducing the beat is particularly important in view of reducing the beat.
The motor shell produced by the low-pressure casting process generally has the problems of long process beat, shrinkage porosity at thick and large inner positions, unsmooth exhaust and the like. This is particularly true for the motor casing with spiral water channels described in this patent, because its middle annular water channel is formed by the sand core, and the sand core is totally wrapped by aluminium liquid, it is more difficult to exhaust, and the wall thickness difference is great from top to bottom, and the thick position easily produces shrinkage porosity, shrinkage cavity and is difficult to eliminate.
The trade has the measure such as adopting the mould to increase the water-cooled tube and reducing the beat, and the negative pressure is bled and is increased the exhaust, but the effect is limited, and the water-cooled tube problem of leaking is difficult to thoroughly solve, hardly promotes the inside quality of foundry goods again when reducing the beat. The development of motor casings has good prospects and markets, so that the problems are urgently solved.
In the development process of a motor casing product, because of the existence of a water channel, the wall thickness of a casting is different, and for low-pressure casting, the defects of shrinkage porosity, shrinkage cavity and the like are easily generated at a thick position, particularly a solid thick position A above the motor casing water channel, a solid thick position B below the motor casing water channel and a thick position C in the middle of the motor casing at the position shown in figure 1. If no control means is provided, the elimination of defects is difficult to ensure, and the qualification rate of castings is difficult to promote.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a motor casing low-pressure casting cooling system which effectively solves the problems of shrinkage porosity and beat reduction.
In order to achieve the purpose, the invention designs a motor casing low-pressure casting cooling system, which is characterized in that: the mould corresponding to the position of the variable cross section of the water channel of the motor shell is provided with an annular cooling water channel, the mould is provided with a plurality of annular water channels, and each annular water channel is independently connected with a cooling device; and (3) sequentially opening the annular cooling water channels from top to bottom to cool the die, and opening at most two annular cooling water channels simultaneously.
Preferably, the annular cooling water channel is arranged on the die at the position corresponding to the solid thick position above the motor casing water channel and the solid thick position below the motor casing water channel.
Preferably, the mould corresponding to the solid thick position above the motor casing water channel is provided with an annular cooling water channel, and the mould corresponding to the solid thick position below the motor casing water channel is provided with two annular cooling water channels.
Preferably, when the temperature of the mold is 300-20 ℃, the uppermost annular cooling water channel is opened, and when the temperature is reduced to 200-220 ℃, the upper annular cooling water channel is closed and the middle annular cooling water channel is opened; and when the intermediate temperature is reduced to 140-160 ℃, closing the intermediate annular cooling water channel and opening the bottom annular cooling water channel, ensuring that the temperature of the casting is reduced to 60-80 ℃ after the mold is opened, and closing the bottom annular cooling water channel.
Preferably, the central angle of each annular cooling water channel is smaller than 360 degrees, and two ends of the same annular cooling water channel are respectively connected with a point cooling pipe. That is, the annular cooling channel is not a complete closed channel, and is an arc having an inlet at one end and an outlet at the other end.
Preferably, the cross section of the annular cooling water channel is elliptical.
Preferably, the minimum distance between the inner wall of the annular cooling water channel and the outer wall of the casting is 8-10 mm.
As a preferred scheme, the die at the position corresponding to the thick position in the middle of the motor shell is provided with central cooling, and the central cooling is independently connected with a cooling device.
The invention has the beneficial effects that: the invention can effectively control the cooling process of the casting, has good cooling effect, does not generate the defects of shrinkage porosity, shrinkage cavity and the like, and simultaneously improves the production efficiency.
Annular water cooling is arranged in a wall thickness transition area of a casting, particularly a thick and big position, and the annular water cooling and the central water cooling which are independently controlled can effectively ensure that the cooling strength is consistent, so that a foundation is provided for sequential solidification, gas is slowly discharged in a mold filling process, and the gradual internal quality is effectively solved.
Drawings
FIG. 1 is a cross-sectional view of a motor casing
FIG. 2 is an embodiment of a mold utilizing the present invention
FIG. 3 is a schematic structural view of an outer mold core in the embodiment of FIG. 2
FIG. 4 is a schematic cross-sectional view taken at A-A in FIG. 3
In the figure: the die comprises a die core 1, an upper die insert 2, a central insert 3, an inner die core 4, an outer die core 5, a central water cooling 6, a shaping water cooling 7, a spigot 8 and a sealing gasket 9.
Detailed Description
The technical solutions of the present invention (including the preferred ones) are further described in detail by means of fig. 2 to 4 and enumerating some alternative embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a motor casing low-pressure casting cooling system, which is characterized in that: the mould corresponding to the position of the variable cross section of the water channel of the motor shell is provided with an annular cooling water channel, the mould is provided with a plurality of annular water channels, and each annular water channel is independently connected with a cooling device; and (3) sequentially opening the annular cooling water channels from top to bottom to cool the die, and opening at most two annular cooling water channels simultaneously.
Preferably, the annular cooling water channel is arranged on the die at the position corresponding to the solid thick position above the motor casing water channel and the solid thick position below the motor casing water channel.
Preferably, the mould corresponding to the solid thick position above the motor casing water channel is provided with an annular cooling water channel, and the mould corresponding to the solid thick position below the motor casing water channel is provided with two annular cooling water channels.
Preferably, when the temperature of the mold is 300-20 ℃, the uppermost annular cooling water channel is opened, and when the temperature is reduced to 200-220 ℃, the upper annular cooling water channel is closed and the middle annular cooling water channel is opened; and when the intermediate temperature is reduced to 140-160 ℃, closing the intermediate annular cooling water channel and opening the bottom annular cooling water channel, ensuring that the temperature of the casting is reduced to 60-80 ℃ after the mold is opened, and closing the bottom annular cooling water channel.
Preferably, the central angle of each annular cooling water channel is smaller than 360 degrees, and two ends of the same annular cooling water channel are respectively connected with a point cooling pipe. That is, the annular cooling channel is not a complete closed channel, and is an arc having an inlet at one end and an outlet at the other end.
Preferably, the cross section of the annular cooling water channel is elliptical.
Preferably, the minimum distance between the inner wall of the annular cooling water channel and the outer wall of the casting is 8-10 mm.
As shown in fig. 2 to 4, the motor casing low-pressure casting male die designed by the invention comprises a body, and is characterized in that: the body is provided with a mold core 1, the end part of the mold core 1 is connected with an upper mold insert 2 in a sealing way, and the middle part of the upper mold insert 2 is fixedly connected with a central insert 3 in a sealing way; the mold core 1 comprises an inner mold core 4 and an outer mold core 5 which are coaxially arranged, and the inner mold core 4 is positioned in the outer mold core 5; the inner wall of the outer mold core 5 is provided with a plurality of annular water-cooling 7 along the axial direction, and the central insert 3 is provided with a central water-cooling 6; the annular water-cooling pipes 7 and the central water-cooling pipe 6 are independent and are connected with a spot-cooling pipe.
Preferably, the annular water cooling 7 comprises a prefabricated annular water channel, and a groove for accommodating the annular water channel is formed in the inner wall of the outer mold core 5; each annular water channel is independently connected with an independent spot cooling pipe.
Further preferably, the annular water channel is welded with the outer wall of the inner mold core 4.
Preferably, the upper die insert 2 is welded to the end faces of the inner die core 4 and the outer die core 5, and a gasket 9 is arranged between the boundary between the inner die core 4 and the outer die core 5 and the upper die insert 2.
Preferably, the central insert 3 is connected with the upper die insert 2, and the central insert 3 is connected with the inner die core 4 in a welding manner.
Preferably, the upper die insert 2 is matched with the inner die core 4 through a spigot 8. Therefore, the sealing performance is further ensured, and the safety is synchronously improved.
In this case, three annular water-cooling zones are provided on the inner wall of the outer mould core 5, the choice of which is determined by the product, generally in the transition region of the wall thickness of the casting, in particular in the region of the large thickness.
By adjusting the cooling time and the intensity of the central water cooling, the process beat can be reduced by 20 percent.
The tail end of the annular water channel is connected with the spot cooling pipe, then the annular water channel is led out from the upper die, and the cooling strength is ensured to be consistent through continuous inflow and outflow of circulating water, so that a foundation is provided for sequential solidification. In addition, the opening time of the three annular water channels is gradually adjusted by matching the three annular water channels, so that gas is slowly discharged in the mold filling process, and the internal quality of the casting is effectively solved. This is also the most important part of the patent of the present invention.
The central angle of each annular cooling water channel is smaller than 360 degrees, and two ends of the same annular cooling water channel are respectively connected with a point cooling pipe. That is, the annular cooling channel is not a complete closed channel, and is an arc having an inlet at one end and an outlet at the other end. The design of one inlet and one outlet ensures that the temperature of the circulating water is always controllable, and the cooling effect is exerted to the maximum.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, combination, replacement, or improvement made within the spirit and principle of the present invention is included in the scope of the present invention.
Claims (8)
1. The utility model provides a motor casing low pressure casting cooling system which characterized in that: the mould corresponding to the position of the variable cross section of the water channel of the motor shell is provided with an annular cooling water channel, the mould is provided with a plurality of annular water channels, and each annular water channel is independently connected with a cooling device; and (3) sequentially opening the annular cooling water channels from top to bottom to cool the die, and opening at most two annular cooling water channels simultaneously.
2. The motor casing low pressure casting cooling system of claim 1, wherein: the annular cooling water channel is arranged on the die at the position corresponding to the solid thick position above the motor shell water channel and the solid thick position below the motor shell water channel.
3. The motor casing low pressure casting cooling system of claim 2, wherein: the mould corresponding to the solid thick position above the motor casing water channel is provided with an annular cooling water channel, and the mould corresponding to the solid thick position below the motor casing water channel is provided with two annular cooling water channels.
4. The motor casing low pressure casting cooling system of claim 3, wherein: when the temperature of the mold is between 300 and 20 ℃, opening the uppermost annular cooling water channel, and when the temperature is reduced to between 200 and 220 ℃, closing the upper annular cooling water channel and opening the middle annular cooling water channel; and when the intermediate temperature is reduced to 140-160 ℃, closing the intermediate annular cooling water channel and opening the bottom annular cooling water channel, ensuring that the temperature of the casting is reduced to 60-80 ℃ after the mold is opened, and closing the bottom annular cooling water channel.
5. The motor casing low pressure casting cooling system of any one of claims 1 to 4, wherein: the central angle of each annular cooling water channel is smaller than 360 degrees, and two ends of the same annular cooling water channel are respectively connected with a point cooling pipe.
6. The motor casing low pressure casting cooling system of claim 5, wherein: the section of the annular cooling water channel is oval.
7. The motor casing low pressure casting cooling system of claim 5, wherein: the minimum distance between the inner wall of the annular cooling water channel and the outer wall of the casting is 8-10 mm.
8. The motor casing low pressure casting cooling system of claim 5, wherein: and a central cooling device is arranged on the die at the position corresponding to the thick position in the middle of the motor shell and is independently connected with the cooling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011394939.2A CN112605365A (en) | 2020-12-01 | 2020-12-01 | Motor casing low pressure casting cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011394939.2A CN112605365A (en) | 2020-12-01 | 2020-12-01 | Motor casing low pressure casting cooling system |
Publications (1)
| Publication Number | Publication Date |
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| CN112605365A true CN112605365A (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011394939.2A Pending CN112605365A (en) | 2020-12-01 | 2020-12-01 | Motor casing low pressure casting cooling system |
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| CN (1) | CN112605365A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010227980A (en) * | 2009-03-27 | 2010-10-14 | Honda Motor Co Ltd | Cavity insert for casting |
| CN203426418U (en) * | 2013-08-13 | 2014-02-12 | 秦皇岛戴卡美铝车轮有限公司 | Water-cooled aluminum alloy wheel low-pressure casting mold |
| JPWO2016039484A1 (en) * | 2014-09-12 | 2017-07-20 | 日立金属株式会社 | LIGHT ALLOY WHEEL, ITS MANUFACTURING METHOD, AND ITS MANUFACTURING DEVICE |
| CN107716900A (en) * | 2017-11-29 | 2018-02-23 | 广东肇庆动力金属股份有限公司 | A kind of motor casing low pressure casting is layered water-cooling process |
| CN207629179U (en) * | 2017-11-14 | 2018-07-20 | 浙江巨久轮毂有限公司 | Hub mold water cooling plant |
| CN210098931U (en) * | 2019-04-26 | 2020-02-21 | 广东肇庆动力金属股份有限公司 | Be used for as cast mould of aluminum alloy motor casing |
| CN110976815A (en) * | 2019-12-30 | 2020-04-10 | 中信戴卡股份有限公司 | Die water cooling device and system |
| CN211629998U (en) * | 2020-04-24 | 2020-10-02 | 重庆志成机械有限公司 | Cooling structure of new forms of energy motor casing |
-
2020
- 2020-12-01 CN CN202011394939.2A patent/CN112605365A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010227980A (en) * | 2009-03-27 | 2010-10-14 | Honda Motor Co Ltd | Cavity insert for casting |
| CN203426418U (en) * | 2013-08-13 | 2014-02-12 | 秦皇岛戴卡美铝车轮有限公司 | Water-cooled aluminum alloy wheel low-pressure casting mold |
| JPWO2016039484A1 (en) * | 2014-09-12 | 2017-07-20 | 日立金属株式会社 | LIGHT ALLOY WHEEL, ITS MANUFACTURING METHOD, AND ITS MANUFACTURING DEVICE |
| CN207629179U (en) * | 2017-11-14 | 2018-07-20 | 浙江巨久轮毂有限公司 | Hub mold water cooling plant |
| CN107716900A (en) * | 2017-11-29 | 2018-02-23 | 广东肇庆动力金属股份有限公司 | A kind of motor casing low pressure casting is layered water-cooling process |
| CN210098931U (en) * | 2019-04-26 | 2020-02-21 | 广东肇庆动力金属股份有限公司 | Be used for as cast mould of aluminum alloy motor casing |
| CN110976815A (en) * | 2019-12-30 | 2020-04-10 | 中信戴卡股份有限公司 | Die water cooling device and system |
| CN211629998U (en) * | 2020-04-24 | 2020-10-02 | 重庆志成机械有限公司 | Cooling structure of new forms of energy motor casing |
Non-Patent Citations (2)
| Title |
|---|
| 王金华: "《铸件结构设计》", 30 April 1983 * |
| 赵越静: "《现代模具加工技术》", 31 January 2015 * |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20211201 Address after: 442020 No. 115, Checheng West Road, Shiyan City, Hubei Province Applicant after: General casting and Forging Branch of Dongfeng auto parts (Group) Co.,Ltd. Address before: 430056 No. 10 Dongfeng Avenue, Wuhan economic and Technological Development Zone, Wuhan, Hubei Applicant before: DONGFENG MOTER Co.,Ltd. |
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| TA01 | Transfer of patent application right | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210406 |
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| RJ01 | Rejection of invention patent application after publication |