CN106735088B - Special casting mould for low-pressure forming - Google Patents
Special casting mould for low-pressure forming Download PDFInfo
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- CN106735088B CN106735088B CN201710026985.9A CN201710026985A CN106735088B CN 106735088 B CN106735088 B CN 106735088B CN 201710026985 A CN201710026985 A CN 201710026985A CN 106735088 B CN106735088 B CN 106735088B
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- filter plate
- casting
- groove
- heat preservation
- mold
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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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- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention discloses a special casting mold for low-pressure forming, wherein a sealing cover is arranged above a graphite crucible, a circular insertion hole is formed in the middle of the sealing cover, a liquid lifting pipe is in interference fit with the circular insertion pipe, one end of the liquid lifting pipe is positioned at the bottom of the graphite crucible and in molten metal, the other end of the liquid lifting pipe is connected with a cavity, a lower mold is arranged above the sealing cover, an upper mold is positioned above the lower mold, and a filtering device is arranged at the lower end of the liquid lifting pipe; the casting mould is designed to be thin at the top and thick at the bottom, a cold water cavity is arranged in the upper mould, a heat preservation cavity is arranged in the lower mould, a filter device is arranged at the mouth of a liquid lifting pipe, filter holes with different diameters are arranged on a first filter plate and a second filter plate, the outer layer and the top of a casting are firstly solidified when the casting mould is filled with molten metal, and the shrinkage holes are concentrated in the inner layer at the bottom of the casting, so that a compact casting is easier to obtain, in addition, the filter plates can filter impurities in the molten metal, the purity of the casting is improved, the rotation angle of the second filter plate can be adjusted according to needs, and the flow rate of the molten metal during filling.
Description
Technical Field
The invention relates to a casting mould, in particular to a casting mould special for low-pressure forming.
Background
The casting is a technological process of smelting metal into liquid meeting certain requirements, pouring the liquid into a casting mold, cooling, solidifying and cleaning to obtain a casting with a preset shape, size and performance. The cast blank is nearly formed, so that the purposes of no machining or less machining are achieved, the cost is reduced, and the manufacturing time is reduced to a certain extent.
The high-pressure casting is mainly used for shell castings, the high-pressure casting efficiency is high, but the castings can not be subjected to heat treatment. The low-pressure casting is a casting method which adopts air pressure mold filling and is crystallized under pressure, the casting has compact structure and can be subjected to heat treatment, the low-pressure casting mold filling is stable, and the directions of liquid flow and air flow are consistent, so that the defects are few; the structure is compact, and the mechanical property of the casting is high; the mold filling capacity is strong, and the casting with clear outline and smooth surface is formed, so that the important aluminum alloy casting is cast at low pressure. However, low-pressure casting often generates oxide inclusions and shrinkage cavities in continuous production, and the quality of castings is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides the special casting mold for low-pressure forming, which greatly reduces the oxide inclusions and shrinkage cavities of the castings and improves the purity and quality of the castings.
The invention provides a special casting mold for low-pressure molding, wherein an air inlet pipe is arranged on the side wall of a graphite crucible, a sealing cover is arranged above the graphite crucible, a circular insertion hole is arranged in the middle of the sealing cover, a liquid lifting pipe is in interference fit with the circular insertion pipe, one end of the liquid lifting pipe is positioned at the bottom of the graphite crucible and in molten metal, the other end of the liquid lifting pipe is connected with a cavity, a lower mold is arranged above the sealing cover, the cross section of the lower mold is in an inverted T shape, a heat preservation cavity is arranged inside the lower mold, the heat preservation cavity is positioned at the lower part of the lower mold, the cross section of the heat preservation cavity is in an L shape, the height d3 at the bottom of the heat preservation cavity is larger than the thickness d4 at the upper part of the heat preservation cavity, high-temperature-resistant heat preservation materials are arranged in the heat preservation cavity, an upper mold is positioned above the lower mold, the bottom of, the other end is provided with a water outlet, the water inlet and the water outlet are communicated with the inside of the cold water cavity, the lower end of the riser tube is provided with a filtering device, the filtering device comprises an upper gland, a lower gland, a first filter plate, a second filter plate, a connecting ring and a base, the connecting ring is in a circular ring shape, the middle part is in a hollow structure, the connecting ring is positioned at the tube opening of the riser tube, the connecting ring and the riser tube are designed into a whole, the base is in a circular ring-shaped hollow structure, the inner wall of the base is provided with a groove, the first filter plate and the second filter plate are positioned in the groove, the upper cover plate is positioned above the connecting ring, the bottom of the upper cover plate is connected with the upper part of the connecting ring, the lower cover plate is positioned below the base, the top of the lower cover plate is connected with, the diameter of filtering the hole increases outwards in proper order by the centre of a circle, be equipped with the filtration hole the same with first filter on the second filter, be equipped with the regulation handle in the middle of the second filter, the second filter is equipped with the locating piece, the base inner wall is equipped with first constant head tank, second constant head tank, third constant head tank, and contained angle theta between first constant head tank and the second constant head tank is 22.5, and the third constant head tank is located the intermediate position of first constant head tank and second constant head tank.
The first filter plate is fixedly connected with the base, a cylindrical insertion groove is formed in the middle of the first filter plate, an insertion groove is formed in the middle of the second filter plate, a circular groove is formed in the inner wall of the insertion groove, the middle shaft is cylindrical, a circular protrusion is arranged on the lower portion of the middle shaft, the upper end of the middle shaft is fixedly connected with the cylindrical insertion groove of the first filter plate, the lower end of the middle shaft is rotatably connected with the insertion groove of the second filter plate, and the circular protrusion is located in the.
The base is made of high-temperature-resistant elastic materials.
The thickness d1 of the upper-type side wall is smaller than the thickness d2 of the lower-type side wall.
The high-temperature resistant heat-insulating material is polycrystalline alumina fiber.
The invention has the advantages that the casting mould is designed to be thin at the top and thick at the bottom, the thickness d1 of the upper side wall is smaller than the thickness d2 of the lower side wall, the upper mould is internally provided with a cold water cavity, the lower mould is provided with a heat preservation cavity, the liquid lifting pipe orifice is provided with a filtering device, the first filtering plate and the second filtering plate are provided with filtering holes with different diameters, the diameters of the filtering holes are sequentially increased from the circle center to the outside, the outer layer and the top of the casting are firstly solidified when the molten metal is filled with the casting, the inner layer and the bottom of the casting are finally solidified, the shrinkage cavity is concentrated on the inner layer at the bottom of the casting, the shrinkage cavity phenomenon of the casting is favorably reduced, a compact casting is more easily obtained, in addition, impurities in the molten metal can be effectively filtered by the filter plate, the purity of the casting is improved, the rotating angle of the second filter plate can be adjusted through the handle according to needs, the flow rate of the molten metal during filling is controlled, and the castings with different performances are obtained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic view of a first filter plate;
FIG. 4 is a schematic view of a second filter plate;
FIG. 5 is an enlarged view of FIG. 2 at B;
FIG. 6 is an enlarged view at C of FIG. 2;
in the figure: 1-lower type, 2-liquid outlet, 3-water cooling cavity, 4-water inlet, 5-upper type, 6-heat preservation cavity, 7-sealing cover, 8-air inlet pipe, 9-graphite crucible, 10-metal liquid, 11-riser pipe, 12-upper pressing cover, 13-lower pressing cover, 14-first filtering plate, 15-second filtering plate, 16-connecting ring, 17-base, 18-first positioning groove, 19-positioning block, 20-second positioning groove, 21-handle, 22-third positioning groove, 23-middle shaft, 24-circular groove, 25-insertion groove and 26-circular protrusion.
Detailed Description
The invention will be further supplemented and explained below with reference to the description of the embodiments and the drawings.
As shown in the figure, the invention provides a special casting mold for low-pressure forming, wherein an air inlet pipe is arranged on the side wall of a graphite crucible, a sealing cover is arranged above the graphite crucible, a circular insertion hole is arranged in the middle of the sealing cover, a liquid lifting pipe is in interference fit with the circular insertion pipe, one end of the liquid lifting pipe is positioned at the bottom of the graphite crucible and in molten metal, the other end of the liquid lifting pipe is connected with a cavity, a lower mold is arranged above the sealing cover, the lower mold is of an inverted T-shaped cross section, a heat preservation cavity is arranged inside the lower mold, the heat preservation cavity is positioned at the lower part of the lower mold, the cross section of the heat preservation cavity is L-shaped, the height d3 of the bottom of the heat preservation cavity is larger than the thickness d4 of the upper part of the heat preservation cavity, high-temperature-resistant heat preservation material is arranged inside the heat preservation cavity, an upper mold is positioned above the lower mold, the bottom, the other end is provided with a water outlet, the water inlet and the water outlet are communicated with the inside of the cold water cavity, the lower end of the riser tube is provided with a filtering device, the filtering device comprises an upper gland, a lower gland, a first filter plate, a second filter plate, a connecting ring and a base, the connecting ring is in a circular ring shape, the middle part is in a hollow structure, the connecting ring is positioned at the tube opening of the riser tube, the connecting ring and the riser tube are designed into a whole, the base is in a circular ring-shaped hollow structure, the inner wall of the base is provided with a groove, the first filter plate and the second filter plate are positioned in the groove, the upper cover plate is positioned above the connecting ring, the bottom of the upper cover plate is connected with the upper part of the connecting ring, the lower cover plate is positioned below the base, the top of the lower cover plate is connected with, the diameter of filtering the hole increases outwards in proper order by the centre of a circle, be equipped with the filtration hole the same with first filter on the second filter, be equipped with the regulation handle in the middle of the second filter, the second filter is equipped with the locating piece, the base inner wall is equipped with first constant head tank, second constant head tank, third constant head tank, and contained angle theta between first constant head tank and the second constant head tank is 22.5, and the third constant head tank is located the intermediate position of first constant head tank and second constant head tank.
The first filter plate is fixedly connected with the base, a cylindrical insertion groove is formed in the middle of the first filter plate, an insertion groove is formed in the middle of the second filter plate, a circular groove is formed in the inner wall of the insertion groove, the middle shaft is cylindrical, a circular protrusion is arranged on the lower portion of the middle shaft, the upper end of the middle shaft is fixedly connected with the cylindrical insertion groove of the first filter plate, the lower end of the middle shaft is rotatably connected with the insertion groove of the second filter plate, and the circular protrusion is located in the.
The base is made of high-temperature-resistant elastic materials.
The thickness d1 of the upper-type side wall is smaller than the thickness d2 of the lower-type side wall.
The high-temperature resistant heat-insulating material is polycrystalline alumina fiber.
When the positioning device is used, the flow rate is fastest when the positioning block is positioned in the first positioning groove, the flow rate is zero when the positioning block is positioned in the second positioning groove, and the flow rate is medium when the positioning block is positioned in the third positioning groove.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (4)
1. A special casting mold for low-pressure forming is characterized in that an air inlet pipe is arranged on the side wall of a graphite crucible, a sealing cover is arranged above the graphite crucible, a circular insertion hole is formed in the middle of the sealing cover, a liquid lifting pipe is in interference fit with the circular insertion pipe, one end of the liquid lifting pipe is positioned at the bottom of the graphite crucible and in molten metal, the other end of the liquid lifting pipe is connected with a cavity, a lower mold is arranged above the sealing cover, the cross section of the lower mold is in an inverted T shape, a heat preservation cavity is arranged inside the lower mold, the heat preservation cavity is positioned at the lower part of the lower mold, the cross section of the heat preservation cavity is in an L shape, the height d3 of the bottom of the heat preservation cavity is larger than the thickness d4 of the upper part of the heat preservation cavity, high-temperature-resistant heat preservation material is arranged in the heat preservation cavity, an upper mold is positioned above the lower mold, the bottom of the upper, the other end is provided with a water outlet, the water inlet and the water outlet are communicated with the inside of the cold water cavity, the lower end of the riser tube is provided with a filtering device, the filtering device comprises an upper pressing cover, a lower pressing cover, a first filter plate, a second filter plate, a connecting ring and a base, the connecting ring is in a circular ring shape, the middle part is in a hollow structure, the connecting ring is positioned at the tube opening of the riser tube, the connecting ring and the riser tube are designed into a whole, the base is in a circular ring-shaped hollow structure, the inner wall of the base is provided with a groove, the first filter plate and the second filter plate are positioned in the groove, the upper pressing cover is positioned above the connecting ring, the bottom of the upper pressing cover is connected with the upper part of the connecting ring, the lower pressing cover is positioned below the base, the top of the lower pressing cover is connected with the, the diameters of the filter holes are sequentially increased from the circle center to the outside, the second filter plate is provided with the filter holes identical to those of the first filter plate, the middle of the second filter plate is provided with an adjusting handle, the second filter plate is provided with a positioning block, the inner wall of the base is provided with a first positioning groove, a second positioning groove and a third positioning groove, the included angle theta between the first positioning groove and the second positioning groove is 22.5 degrees, and the third positioning groove is positioned in the middle of the first positioning groove and the second positioning groove; the thickness d1 of the upper-type side wall is smaller than the thickness d2 of the lower-type side wall.
2. The casting mold according to claim 1, wherein the first filter plate is fixedly connected to the base, a cylindrical insertion groove is formed in the middle of the first filter plate, an insertion groove is formed in the middle of the second filter plate, a circular groove is formed in an inner wall of the insertion groove, the center shaft is cylindrical, a circular protrusion is formed at a lower portion of the center shaft, an upper end of the center shaft is fixedly connected to the cylindrical insertion groove of the first filter plate, a lower end of the center shaft is rotatably connected to the insertion groove of the second filter plate, and the circular protrusion is located in the circular groove.
3. The casting mold for low pressure molding as claimed in claim 1, wherein the base is made of high temperature resistant elastic material.
4. The casting mold special for low-pressure molding according to claim 1, wherein the high-temperature resistant and heat-insulating material is polycrystalline alumina fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026985.9A CN106735088B (en) | 2017-01-15 | 2017-01-15 | Special casting mould for low-pressure forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026985.9A CN106735088B (en) | 2017-01-15 | 2017-01-15 | Special casting mould for low-pressure forming |
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| Publication Number | Publication Date |
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| CN106735088A CN106735088A (en) | 2017-05-31 |
| CN106735088B true CN106735088B (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710026985.9A Active CN106735088B (en) | 2017-01-15 | 2017-01-15 | Special casting mould for low-pressure forming |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175305A (en) * | 2018-10-12 | 2019-01-11 | 珠海格力电器股份有限公司 | Impeller casting process and impeller |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0858852A1 (en) * | 1997-02-07 | 1998-08-19 | Yamaha Hatsudoki Kabushiki Kaisha | Filter for molten metal and casting apparatus |
| CN202239577U (en) * | 2011-12-07 | 2012-05-30 | 重庆志成机械股份有限公司 | Low pressure casting die structure |
| CN202804142U (en) * | 2012-09-29 | 2013-03-20 | 陈小苹 | Aluminum alloy hub low pressure casting equipment provided with purifying and impurity removing device |
| CN103736968A (en) * | 2013-11-13 | 2014-04-23 | 江苏凯特汽车部件有限公司 | Low-pressure casting device for aluminum alloy wheels of automobile |
| CN204018716U (en) * | 2014-07-24 | 2014-12-17 | 浙江正康科技有限公司 | A kind of filter of low-pressure casting |
| CN205008554U (en) * | 2015-09-13 | 2016-02-03 | 杨惠萍 | High -efficient portable stalk |
| CN205200506U (en) * | 2015-12-31 | 2016-05-04 | 淄博新峰耐火材料有限公司 | Stalk for cast aluminium alloy |
| CN205660144U (en) * | 2016-09-07 | 2016-10-26 | 中信戴卡股份有限公司 | Riser tube |
| CN206543872U (en) * | 2017-01-15 | 2017-10-10 | 丹阳荣嘉精密机械有限公司 | The special casting mould of low pressure molding |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202555798U (en) * | 2012-04-24 | 2012-11-28 | 太仓子午电气有限公司 | Low-pressure casting mold |
| CN202763013U (en) * | 2012-09-21 | 2013-03-06 | 宁波吉威熔模铸造有限公司 | Low-pressure casting mould |
-
2017
- 2017-01-15 CN CN201710026985.9A patent/CN106735088B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0858852A1 (en) * | 1997-02-07 | 1998-08-19 | Yamaha Hatsudoki Kabushiki Kaisha | Filter for molten metal and casting apparatus |
| CN202239577U (en) * | 2011-12-07 | 2012-05-30 | 重庆志成机械股份有限公司 | Low pressure casting die structure |
| CN202804142U (en) * | 2012-09-29 | 2013-03-20 | 陈小苹 | Aluminum alloy hub low pressure casting equipment provided with purifying and impurity removing device |
| CN103736968A (en) * | 2013-11-13 | 2014-04-23 | 江苏凯特汽车部件有限公司 | Low-pressure casting device for aluminum alloy wheels of automobile |
| CN204018716U (en) * | 2014-07-24 | 2014-12-17 | 浙江正康科技有限公司 | A kind of filter of low-pressure casting |
| CN205008554U (en) * | 2015-09-13 | 2016-02-03 | 杨惠萍 | High -efficient portable stalk |
| CN205200506U (en) * | 2015-12-31 | 2016-05-04 | 淄博新峰耐火材料有限公司 | Stalk for cast aluminium alloy |
| CN205660144U (en) * | 2016-09-07 | 2016-10-26 | 中信戴卡股份有限公司 | Riser tube |
| CN206543872U (en) * | 2017-01-15 | 2017-10-10 | 丹阳荣嘉精密机械有限公司 | The special casting mould of low pressure molding |
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| CN106735088A (en) | 2017-05-31 |
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