CN115570116B - A low-pressure casting mold and process method for flywheel housing - Google Patents
A low-pressure casting mold and process method for flywheel housingInfo
- Publication number
- CN115570116B CN115570116B CN202211208765.5A CN202211208765A CN115570116B CN 115570116 B CN115570116 B CN 115570116B CN 202211208765 A CN202211208765 A CN 202211208765A CN 115570116 B CN115570116 B CN 115570116B
- Authority
- CN
- China
- Prior art keywords
- flywheel
- sand core
- flywheel housing
- die
- inner cavity
- 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
Classifications
-
- 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
本发明公开了一种飞轮壳体的低压铸造模具及工艺方法。它包括设于模具的上模和下模内的飞轮壳内腔砂芯，所述飞轮壳内腔砂芯的浇口为三叉圆锥形内浇道。本发明飞轮壳体低压铸造模具浇注系统只采用单升液道分出三叉形内浇口，其它部位不使用冒口进行模具温度调节控制凝固顺序，通过使用多处模具冷却来调节模具温度，进而影响低压铸造时金属液在模具中的凝固顺序，加快模具冷却提升产品生产节拍。
The present invention discloses a low-pressure casting mold and process for a flywheel housing. The mold comprises a flywheel housing inner cavity sand core disposed within the upper and lower molds of the mold, the gate of the flywheel housing inner cavity sand core being a trident conical ingode. The pouring system of the flywheel housing low-pressure casting mold of the present invention utilizes only a single-lift liquid channel to separate the trident ingode, and does not utilize risers in other locations to regulate mold temperature and control the solidification sequence. By utilizing multiple mold cooling points to regulate mold temperature, the mold solidification sequence of the molten metal in the mold during low-pressure casting is influenced, accelerating mold cooling and improving product production cycle time.
Description
Technical Field
The invention belongs to the technical field of low-pressure casting processes, and particularly relates to a low-pressure casting die and a process method of a flywheel housing.
Background
The existing flywheel shell casting has the appearance size of 553mm multiplied by 549mm multiplied by 203mm, the wall thickness of the part is uneven, as shown in figures 1-2, the wall thickness of the upper flange is 20-25mm, the wall thickness of the middle is 7-8mm, the thickness of the gear chamber mounting hole is 60-70mm, the inner cavity is of a structure of small upper part and large lower part, wherein phi 2 is larger than phi 1, and a temperature field which is solidified in sequence from top to bottom is difficult to form during low-pressure casting. At present, the low-pressure casting die of the flywheel shell is designed by adopting a multi-inner-gate and multi-riser die method, and has the defect of low material utilization rate of product blanks, wherein the material utilization rate is only about 70-75%.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a low-pressure casting die and a process method for a flywheel housing. The utilization rate of flywheel shell materials is improved, and the production beat is reduced.
The low-pressure casting die for the flywheel housing comprises a flywheel housing inner cavity sand core arranged in an upper die and a lower die of the die, wherein a pouring gate of the flywheel housing inner cavity sand core is a three-fork conical inner pouring gate.
Further preferably, the three-fork conical ingate is respectively opposite to three different directions of the flywheel casing casting. The casting mold filling process ensures that the molten aluminum is stable during casting mold filling, the molten aluminum can smoothly fill the mold, the pressure parameter during actual production is that the lifting hydraulic pressure is 250mbar/15s, the mold filling 1 section pressure is 260mbar/4s, the mold filling 2 section pressure is 300mbar/2s, and the pressurizing pressure is 550mbar/2s.
Further preferably, the inner cavity sand core of the flywheel shell is provided with a plurality of core head positioning structures, and the sand core head of the inner cavity sand core of the flywheel shell is placed at the corresponding position of the lower die, and after the sand core head is placed, the fit clearance between the inner cavity sand core of the flywheel shell and the core head is 0.1-0.2mm.
The mold disclosed by the invention cannot be formed by directly demolding through a metal mold due to the fact that the structural characteristic of the inner cavity of the flywheel housing casting is small at the upper part and large at the lower part, the flywheel housing inner cavity sand core is designed for solving the structural characteristic of the inner cavity, the flywheel housing inner cavity sand core is designed with a plurality of core head positioning structures, and the sand core head is placed at the corresponding position of the lower mold during casting, so that the fit clearance between the sand core and the core head is 0.1-0.2mm after the sand core is placed.
According to the scheme, a single-liter liquid channel is adopted to divide feeding from a great circle of a part into three inner pouring gates, a riser is not used at other parts, the casting gas is discharged to solve the defect of holding gas of a casting through designing the structure of a sand core and the gap between the sand core and the die, the temperature of the die is regulated through cooling a plurality of dies, the solidification sequence of molten metal in the die during low-pressure casting is influenced, the structural design of the pouring gates and the riser is reduced or cancelled, and the material utilization rate is greatly improved to more than 90%.
In a further preferred structure, an exhaust gap is arranged at the contact part of the flywheel housing inner cavity sand core and the upper die and is used for discharging gas in the mold filling process into a cavity formed by the flywheel housing inner cavity sand core and the upper die, and the gas is discharged out of the die through an exhaust hole on the upper die.
Further preferable is the structure, wherein the exhaust clearance is 0.1-0.2mm.
In a further preferable structure, a plurality of water-cooling precast pins are arranged in the flywheel housing lower gear chamber mounting hole area corresponding to the lower die.
The internal shrinkage defect of the bolt hole is overcome by cooling the die rapidly under the condition that a riser structure is not adopted, and the problem of air leakage and oil leakage at the part bolt mounting hole is solved. The water-cooled precast pin in the lower gear chamber mounting hole area is cooled by water to the die 20s after the low-pressure casting is started, and the cooling is stopped after the action time is 120 s.
In a further preferred configuration, the mold is provided with a first cooling structure in the flywheel housing oil pump hole area.
The first cooling structure is arranged in the oil pump hole area of the flywheel shell, the mold is cooled by water 25s after low-pressure casting is started, and the cooling is stopped after the action time is 200 s.
In a further preferred structure, the mold is provided with an annular second cooling structure in the flywheel housing oil hole sealing gate area.
An annular second cooling structure is arranged in the flywheel housing oil hole sealing pouring gate area, the problem that the oil seal Kong Jiaokou area is solidified slowly and the casting production efficiency is low is solved, the air cooling in the oil seal Kong Jiaokou area is used for ventilating and cooling the die 100s after the low-pressure casting is started, and the cooling is stopped after the action time is 200 s.
In a further preferable structure, the die is provided with a plurality of water-cooling inserts in the area of the mounting hole of the lower gear chamber of the flywheel housing.
By means of the scheme, the temperature of the area with the local thickness of the flywheel housing casting is reduced, and the problem that the casting with the local temperature of the gear chamber area is high and is easy to deform is solved. The water-cooling insert cooling is carried out by water cooling on the die 30s after low-pressure casting is started, and cooling is stopped after the action time is 180 s.
The invention designs a plurality of cooling structures to accelerate the heat dissipation and the temperature reduction of the die.
The inner cavity of the die is formed by adopting a resin sand core structure.
A process method of a low-pressure casting mold of a flywheel housing comprises the step of performing low-pressure casting molding on the flywheel housing by utilizing the low-pressure casting mold of the flywheel housing.
According to the flywheel shell low-pressure casting die casting system, only a single-liter liquid channel is used for separating a three-fork-shaped inner gate, and other parts do not use a riser for die temperature adjustment and solidification sequence control, and the die temperature is adjusted by using a plurality of die cooling parts, so that the solidification sequence of molten metal in the die during low-pressure casting is influenced, and the die cooling is accelerated to promote the production beat of products.
Drawings
FIG. 1 is a schematic view of a prior art flywheel housing;
FIG. 2is a schematic illustration of the structural features of a prior art flywheel housing;
FIG. 3 is a schematic diagram of the inner cavity sand core structure of the flywheel housing of the present invention;
FIG. 4 is a schematic view of the three-fork conical ingate structure of the present invention;
FIG. 5 is a schematic illustration of the sand core characteristics of the flywheel housing inner cavity of the present invention;
FIG. 6 is a partial schematic view of a three-prong conical ingate of the present invention;
FIG. 7 is a schematic illustration of the present invention schematic diagram of the position of the exhaust hole;
FIG. 8 is a schematic view of the water cooling structure in the area of the mounting hole of the lower gear chamber of the flywheel housing of the present invention;
FIG. 9 is a schematic view of the cooling structure of the flywheel housing oil pump hole area according to the present invention;
FIG. 10 is a schematic view of cooling structure of the flywheel housing oil seal gate area according to the present invention;
FIG. 11 is a schematic view of the structure of the water-cooled insert in the area of the mounting hole of the lower gear chamber of the flywheel housing of the present invention.
In the figure, 1-flywheel casing casting, 2-flywheel casing inner cavity sand core, 3-trigeminal conical ingate, 4-sand core positioning core head, 5-upper die, 6-cavity, 7-exhaust hole, 8-lower die, 9-lower gear chamber mounting hole, 10-water cooling precast pin, 11-first cooling structure, 12-second cooling structure, 13-water cooling insert, 14-side air-extracting water cooling insert and 15-side air-extracting cooling insert.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 3-4 and fig. 6, the low-pressure casting die of the flywheel housing comprises a flywheel housing inner cavity sand core 2 arranged in an upper die 5 and a lower die 8 of the die, and a pouring gate of the flywheel housing inner cavity sand core 2 is a trigeminal cone-shaped inner pouring gate 3.
The three-fork conical ingate 3 faces three different directions of the flywheel housing casting 1 respectively.
As shown in fig. 5, the flywheel housing inner cavity sand core 2 is provided with 5 core head positioning structures 4, and the sand core head of the flywheel housing inner cavity sand core 2 is placed at a corresponding position of the lower die 8, so that the fit clearance between the flywheel housing inner cavity sand core 2 and the core head is 0.1-0.2mm after the sand core head is placed.
As shown in fig. 7, an exhaust gap is provided at the contact position of the flywheel housing inner cavity sand core 2 and the upper die 5 for discharging the gas in the mold filling process into a cavity 6 formed by the flywheel housing inner cavity sand core 2 and the upper die 5, and discharging the gas out of the die through an exhaust hole 7 on the upper die 3.
The exhaust clearance is 0.1-0.2mm.
As shown in fig. 8, 5 water-cooling precast pins 10 are provided in the region of the flywheel housing lower gear chamber mounting holes 9 corresponding to the lower die 8.
As shown in fig. 9, the mold is provided with a first cooling structure 11 in the flywheel housing oil pump hole area.
As shown in fig. 10, the mold is provided with a second cooling structure 12 in the shape of a ring in the flywheel housing oil-seal gate area.
As shown in fig. 11, the mold is provided with a plurality of water-cooling inserts in the area of the gear chamber mounting hole 9 under the flywheel housing, including 6 water-cooling inserts 13, 2 side water-pumping inserts 14 and 1 side air-pumping inserts 15.
The inner cavity of the die is formed by adopting a resin sand core structure.
The low-pressure casting production die for the flywheel shell has the advantages that the pouring gate is a three-fork type inner pouring gate, no pouring system or riser exists at other parts, and the product yield is ensured to be higher than 90%. The invention designs a plurality of forced cooling structures respectively at the lower die sample and the upper die sample, and the cooling structures cool the gate area in the die and the part of the die with slow heat dissipation to reduce the temperature of the die and shorten the production beat to less than 350s.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (2)
1. A low-pressure casting die for flywheel shells is characterized by comprising a flywheel shell inner cavity sand core (2) arranged in an upper die (5) and a lower die (8) of the die, wherein a gate of the flywheel shell inner cavity sand core (2) is a three-fork conical inner runner (3), the three-fork conical inner runner (3) faces three different directions of a flywheel shell casting (1) respectively, the flywheel shell inner cavity sand core (2) is provided with a plurality of core head positioning structures (4), sand core heads of the flywheel shell inner cavity sand core (2) are arranged at corresponding positions of the lower die (8), after the sand core is arranged, the fit clearance between the flywheel shell inner cavity sand core (2) and the core heads is 0.1-0.2mm, an exhaust clearance is arranged at the contact part of the flywheel shell inner cavity sand core (2) and the upper die (5) and is used for discharging gas in a filling process into a cavity (6) formed by the flywheel shell inner cavity sand core (2) and the upper die (5), the method comprises the steps of discharging a die through an exhaust hole (7) on an upper die, wherein the exhaust gap is 0.1-0.2mm, a plurality of water-cooling precast pins (10) are arranged in the area of a flywheel housing lower gear chamber mounting hole (9) corresponding to a lower die (8), a first cooling structure (11) is arranged in the area of a flywheel housing oil pump hole, an annular second cooling structure (12) is arranged in the area of a flywheel housing oil hole sealing pouring gate, and a plurality of water-cooling inserts are arranged in the area of the flywheel housing lower gear chamber mounting hole (9).
2. A process method of a low-pressure casting mold for a flywheel housing is characterized by comprising the step of performing low-pressure casting molding on the flywheel housing by using the low-pressure casting mold for the flywheel housing according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211208765.5A CN115570116B (en) | 2022-09-30 | 2022-09-30 | A low-pressure casting mold and process method for flywheel housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211208765.5A CN115570116B (en) | 2022-09-30 | 2022-09-30 | A low-pressure casting mold and process method for flywheel housing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115570116A CN115570116A (en) | 2023-01-06 |
| CN115570116B true CN115570116B (en) | 2025-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211208765.5A Active CN115570116B (en) | 2022-09-30 | 2022-09-30 | A low-pressure casting mold and process method for flywheel housing |
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| CN (1) | CN115570116B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116037894B (en) * | 2023-02-21 | 2025-12-02 | 重庆百吉四兴压铸有限公司 | Die-casting process of flywheel housing |
| CN118788931B (en) * | 2024-09-14 | 2024-12-13 | 山东宇信铸业有限公司 | A flywheel housing casting mold |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203356528U (en) * | 2013-07-24 | 2013-12-25 | 成都锦兴机电有限责任公司 | Ingate system for pouring flywheel housing by means of lost foam casting |
| CN105268948A (en) * | 2014-12-30 | 2016-01-27 | 新兴重工湖北三六一一机械有限公司 | Aluminum flywheel shell low-pressure metal mold |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4745532B2 (en) * | 2001-05-24 | 2011-08-10 | 旭テック株式会社 | Multi-gate casting mold and casting method |
| CN107737874A (en) * | 2017-09-22 | 2018-02-27 | 西峡县内燃机进排气管有限责任公司 | Heat resisting cast steel turbocharger turbine housing iron die sand casting process |
| CN207746396U (en) * | 2017-12-29 | 2018-08-21 | 湖北航特装备制造股份有限公司 | A kind of full aluminium thin-walled hollow Rear secondary frame for vehicle metal-mold low-pressure casting mold of automobile |
| CN110000337B (en) * | 2019-04-26 | 2024-10-11 | 广东肇庆动力金属股份有限公司 | Aluminum alloy motor casing casting die |
| CN214684219U (en) * | 2020-12-29 | 2021-11-12 | 北京航空航天大学青岛研究院 | Low-pressure casting die structure for motor end cover of new energy automobile |
| CN114433818B (en) * | 2022-02-22 | 2024-05-10 | 烟台路通精密科技股份有限公司 | Low-pressure casting method and device for thin-wall complex aluminum alloy gearbox shell |
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- 2022-09-30 CN CN202211208765.5A patent/CN115570116B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203356528U (en) * | 2013-07-24 | 2013-12-25 | 成都锦兴机电有限责任公司 | Ingate system for pouring flywheel housing by means of lost foam casting |
| CN105268948A (en) * | 2014-12-30 | 2016-01-27 | 新兴重工湖北三六一一机械有限公司 | Aluminum flywheel shell low-pressure metal mold |
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| CN115570116A (en) | 2023-01-06 |
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