CN101804453A - Production process of ultrathin-wall and leakage-free aviation aluminium alloy castings - Google Patents
Production process of ultrathin-wall and leakage-free aviation aluminium alloy castings Download PDFInfo
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- CN101804453A CN101804453A CN 201010155603 CN201010155603A CN101804453A CN 101804453 A CN101804453 A CN 101804453A CN 201010155603 CN201010155603 CN 201010155603 CN 201010155603 A CN201010155603 A CN 201010155603A CN 101804453 A CN101804453 A CN 101804453A
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- 238000005266 casting Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000008595 infiltration Effects 0.000 claims abstract description 23
- 238000001764 infiltration Methods 0.000 claims abstract description 23
- 239000004411 aluminium Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000004512 die casting Methods 0.000 claims description 45
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical group NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 22
- 238000005516 engineering process Methods 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 11
- 125000005474 octanoate group Chemical group 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 239000006104 solid solution Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 2
- 238000003825 pressing Methods 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 1
- 230000000979 retarding effect Effects 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
The invention relates to a production process of ultrathin-wall and leakage-free aviation aluminium alloy castings. The production process is characterized by comprising the following steps of: manufacturing a pressure-casting mould, machining a double circular ingate, a pressure-casting inlet and a distribution pouring gate on a right mould of the pressure-casting mould; machining a T-shaped exhaust groove on a left mould of the pressure-casting mould, pouring, lightly pressing, strongly pressing and demoulding; and finally carrying out infiltration process treatment. The special pressure-casting mould of the ultrathin-wall and leakage-free aviation aluminium alloy castings adopts a double circular feeding structure and a T-shaped exhaust groove structure, wherein the double circular feeding structure ensures that aluminium liquid fast enters a cavity in the pressure casting process and the thin wall of a part is partially filled; and the T-shaped exhaust groove structure ensures the exhaust of the cavity during the fast filling of the aluminium liquid and prevents the castings from carrying gas. The infiltration process of the invention improves the air impermeability of the product and enables the part to have an inflaming retarding function in addition, and the infiltration is finished through carrying out the work procedures of cleaning with hot water, drying, infiltrating and baking on the castings.
Description
Technical field
The present invention relates to the die casting field, especially a kind of production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings of the oxygen regulating valve foundry goods that is used to process oxygen mask.
Background technology
Aerolite pressur casting size precision height, allowance is little, and thin-walled moreover, because the particularity of using under the aviation condition does not allow withstand voltage seepage, requires the dense structure of part, does not allow casting flaw, checks and accepts very harsh.
The oxygen regulating valve foundry goods of critical component one oxygen mask that typical product is the oxygen mask in the aviation lifesaving system, this foundry goods belongs to accurate pack alloy, gross weight has only 55g, and complex structure, minimum non-processing wall thickness is 0.5mm, in addition, and also must be under 125psi pressure (being equivalent to 0.86Mpa) leak test, any leakage was arranged in 5 minutes, and part is promptly scrapped.
Even the production of this class part abroad, also is a difficult point always.Develop the production method of this class part, except that the quality requirement that satisfies product, also must improve product percent of pass, reduce production cost of products.
Summary of the invention
The object of the present invention is to provide a kind of production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings, this technology adopts the mould of special feeding structure and exhaust structure when die casting, and, can effectively overcome above-mentioned drawback to the part that die casting the is come out processing of infiltrating.
Technical scheme of the present invention is:.
The die casting mould special of the production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings of the present invention adopts Crossed Circle feeding structure and T shape vent groove configuration; The structure of Crossed Circle charging makes that in press casting procedure aluminium liquid enters die cavity fast, guaranteed that the part thin-walled portion is full of, and T shape vent groove configuration has guaranteed to fill fast at aluminium liquid the exhaust of the condition lower impressions of type, prevents the foundry goods gas enclosure.
A kind of production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings is characterized in that may further comprise the steps:
A) make die casting, on the right mould of die casting, process Crossed Circle ingate, die casting inlet and distribute running channel; On left mould, process T shape air discharge duct, and after making good left mould and the assembling of right mould, be installed on the extruder;
B) cast is poured into 640-700 ℃ molten aluminum liquid the die casting inlet that is positioned on the right mould;
C) the light pressure, the compressed head of extruder promotes molten aluminum night, enters the Crossed Circle ingate after aluminium is distributed by the distribution running channel that is positioned at right mould night, enters fast and is full of die cavity by the Crossed Circle ingate, specific pressure is 50-70MPa, and extrusion time is 0.02-0.03 second;
D) suppress, after the light pressure of step 3, extruder is further suppressed aluminium liquid, and specific pressure is 70-100MPa, and extrusion time is 4-5 second;
When carrying out step b, c, d, when aluminium filled type night, gas was discharged by the T shape air discharge duct that is positioned at left mould in the die cavity;
E) demoulding, the foundry goods behind extrusion solidification takes off from extruder, promptly obtains the oxygen regulating valve foundry goods of oxygen mask.
The oxygen regulating valve foundry goods that also comprises the oxygen mask that described step e is obtained carries out the Infiltration Technics processing:
Earlier foundry goods is carried out hot water and clean, hot water temperature 50-60 ℃, vacuum drying, negative pressure be-0.080 to-0.110MPa, 24 ℃ of vacuum environment temperature are put into the treatment fluid that infiltrates to foundry goods then, infiltrate 4-6 hour;
After above-mentioned steps is finished, clean unnecessary infiltration treatment fluid on cast(ing) surface and the screw for 0.4-0.5MPa compressed air with pressure;
Then carry out the vacuum hot water solid solution: foundry goods is carried out hot water clean, hot water temperature 50-60 ℃, negative pressure is-0.080 to-0.110MPa, vacuum drying, and 24 ℃ of vacuum environment temperature are used to remove the solid matter on the foundry goods;
At last, foundry goods is put into 150-250 ℃ baking oven baking 10-25 minute, finish the infiltration treatment process;
Described infiltration treatment fluid is made up of sodium metasilicate, specialist additive and water, and the part by weight of sodium metasilicate, specialist additive and water is 90-110: 1-2: 800-1500; The component of specialist additive is thiocarbamide, cupric octoate, and the weight portion of described thiocarbamide is 70-80, and the weight portion of cupric octoate is 20-30, is 100% in thiocarbamide and cupric octoate.
The shape of T described in step a air discharge duct mainly is made up of exhaust chamber and exhaust passage, and the cross-sectional area of exhaust chamber is greater than the cross-sectional area of exhaust passage.
Described distribution running channel is " Y " shape, is communicated with a pair of circular gate respectively in the left and right sides two-way branch of " Y " shape distribution running channel.
Described Crossed Circle ingate is made up of first ingate and second ingate, and first ingate and second ingate lay respectively at the both sides of die cavity of the fixed die insert of right mould; Perhaps Crossed Circle ingate end is " Y " shape.
First ingate and second ingate of described Crossed Circle ingate are symmetrical arranged.
The invention has the beneficial effects as follows:
The die casting mould special of the production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings of the present invention adopts Crossed Circle feeding structure and T shape vent groove configuration; The structure of Crossed Circle charging makes that in press casting procedure aluminium liquid enters die cavity fast, guaranteed that the part thin-walled portion is full of, and T shape vent groove configuration has guaranteed to fill fast at aluminium liquid the exhaust of the condition lower impressions of type, prevents the foundry goods gas enclosure; This technology has improved the presentation quality of product, and has eliminated the pore of foundry goods inside.Secondly, diecast parts is carried out Infiltration Technics, further improve product air-tightness.
The running channel of the die casting mould special of the production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings of the present invention is by Crossed Circle ingate, die casting inlet and distribute running channel to form, and has increased the speed that metal fills type.T shape vent groove configuration has increased the exhaust velocity of die cavity, and has prevented that molten metal from spraying the accident that causes at a high speed.Owing to adopted T shape vent groove configuration, when molten metal was pressed into casting mold, exhaust faster prevented that foundry goods from pore occurring and having reduced gas content in the foundry goods, make foundry goods can carry out necessary heat treatment, and common die casting is not allow to heat-treat.
The production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings of the present invention is carried out Infiltration Technics to diecast parts, further improves product to air-tightness, and gives the anti-flaming function of part, and the infiltration treatment fluid is made up of sodium metasilicate and specialist additive.By foundry goods being carried out hot water cleaning, dry, infiltrate processing and roasting procedure, finish infiltration.
Utilize the dimensional accuracy of aerolite die casting part of production technology of the present invention and die casting institute die cast and the specification requirement that surface quality satisfies MIL-STD-276A, MIL-A-8625E, MIL-C-83286 standard, part is under 0.86Mpa under the leak test, no any leakage in 5 minutes, the part qualification rate of production surpasses 90%.
Description of drawings
Fig. 1 is the cross-sectional schematic of die casting of the present invention.
Fig. 2 is the perspective exploded view of die casting of the present invention.
Fig. 3 is the planar structure schematic diagram of moving die insert of the present invention.
Fig. 4 is the perspective view of moving die insert of the present invention.
Fig. 5 is a perspective view of utilizing the aerolite die casting of die casting of the present invention institute die cast.
Among the figure: 1 is right mould, and 10 is the cover half frame, and 11 is fixed die insert, and 112 is die cavity, 12 are cover half edge body, and 2 is the Crossed Circle ingate, and 20 is first ingate, and 21 is second ingate, 3 is foundry goods, and 4 are the die casting inlet, and 5 for distributing running channel, 6 insert for exhaust, and 7 is T shape air discharge duct, and 70 is exhaust chamber, 71 is the exhaust passage, and 8 is left mould, and 80 is the dynamic model frame, 81 is moving die insert, and 9 insert for die casting inlet, and 90 water inlet for aluminium liquid.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described:
A kind of production technology of ultrathin-wall and leakage-free aviation aluminium alloy castings may further comprise the steps:
A) make die casting, on the right mould 1 of die casting, process Crossed Circle ingate 2, die casting inlet 4 and distribute running channel 5; On left mould 8, process T shape air discharge duct 7, and after making good left mould 8 and 1 assembling of right mould, be installed on the extruder;
B) cast is poured into 640-700 ℃ molten aluminum liquid the die casting inlet that is positioned on the right mould 8; The molten aluminum liquid temperature is preferably 660 ℃.
C) the light pressure, the compressed head of extruder promotes molten aluminum night, enters Crossed Circle ingate 2 after making aluminium night by distribution running channel 5 distribution that are positioned at right mould 1, enters fast and is full of die cavity 112 by Crossed Circle ingate 2, specific pressure is 50-70MPa, and extrusion time is 0.02-0.03 second;
D) suppress, after the light pressure of step 3, extruder is further suppressed aluminium liquid, and specific pressure is 70-100MPa, and extrusion time is 4-5 second;
When carrying out step b, c, d, when aluminium fills type night, T shape air discharge duct 7 discharges of gases by being positioned at left mould 8 in the die cavity 112;
E) demoulding, the foundry goods 3 behind extrusion solidification takes off from extruder, promptly obtains the oxygen regulating valve foundry goods of oxygen mask.
The oxygen regulating valve foundry goods that also comprises the oxygen mask that described step e is obtained carries out the Infiltration Technics processing:
Earlier foundry goods is carried out hot water and clean, hot water temperature 50-60 ℃, the hot water temperature is preferably 56 ℃, vacuum drying, negative pressure are-0.080 to-0.110MPa, are preferably to be-0.099MPa, 24 ℃ of room temperatures of vacuum environment temperature are put into the infiltration treatment fluid to foundry goods then, infiltrate 4-6 hour;
After above-mentioned steps is finished, clean unnecessary infiltration treatment fluid on foundry goods 3 surfaces and the screw for 0.4-0.5MPa compressed air with pressure;
Then carry out the vacuum hot water solid solution: foundry goods 3 is carried out hot water clean, hot water temperature 50-60 ℃, the hot water temperature is preferably 56 ℃, negative pressure is-0.080 to-0.110MPa, is preferably to be-0.099MPa, vacuum drying, 24 ℃ of room temperatures of vacuum environment temperature are used to remove the solid matter on the foundry goods 3;
At last, foundry goods 3 is put into 150-250 ℃ baking oven baking 10-25 minute, preferred 20 minutes, finish the infiltration treatment process;
The infiltration treatment fluid is made up of sodium metasilicate, specialist additive and water, and the part by weight of sodium metasilicate, specialist additive and water is 90-110: 1-2: 800-1500; The part by weight of specialist additive and water is preferably 98: 2: 1000; The component of specialist additive is thiocarbamide, cupric octoate, and the weight portion of described thiocarbamide is 70-80, and the weight portion of cupric octoate is 20-30, and the weight portion of thiocarbamide is preferably 75, and the weight portion of cupric octoate is preferably 25, is 100% in thiocarbamide and cupric octoate.Sodium metasilicate, thiocarbamide, cupric octoate all can use the marketable material preparation.
Infiltration Technics of the present invention improves product to air-tightness, and gives the anti-flaming function of part, by foundry goods being carried out hot water cleaning, dry, infiltrate processing and roasting procedure, finishes infiltration.
As Fig. 1, Fig. 2, ultrathin-wall non-leakage aviation aluminium alloy element die casting mould special of the present invention, comprise right mould 1, left mould 8 and die casting inlet 4, it is characterized in that described right mould 1 mainly is made up of cover half frame 10 and the fixed die inserts 11 that are embedded in the cover half frame 10, described die casting inlet 4 is arranged on the cover half frame 10, be provided with die cavity 112 in the fixed die insert 11, be provided with cover half edge body 12 in the die cavity 112; Described left mould 8 mainly is made up of dynamic model frame 80 and the moving die inserts 81 that are embedded in the dynamic model frame 80, fixed die insert 11 closes with moving die insert 81 relative edges, moving die insert 81 is provided with the distribution running channel 5 that is communicated with die casting inlet 4, and moving die insert 81 is provided with and connects the Crossed Circle ingate 2 that distributes running channel 5 and be communicated with die cavity 112; Establish on the moving die insert 81 and T shape air discharge duct 7.
As Fig. 3, Fig. 4, the die cast of each foundry goods 3 all forms by the acting in conjunction of Crossed Circle ingate 2 and T shape air discharge duct 7.Aluminium liquid arrives in the Crossed Circle ingate 2 by distributing running channel 5 mean allocation,
T shape air discharge duct 7 mainly is made up of exhaust chamber 70 and exhaust passage 71, and the cross-sectional area of exhaust chamber 70 is greater than the cross-sectional area of exhaust passage 71.Form the long and narrow "T"-shaped cavity configuration of the big end of an end.The volume of the exhaust chamber 70 of T shape air discharge duct 7 is relatively large, be convenient to accommodate the gas of discharging concentrated at short notice, and then through exhaust passage 71 discharges, shape according to foundry goods 3, the a plurality of T shape of mean allocation air discharge duct 7, help gas is evenly fully derived, increased exhaust velocity greatly.
Edge is provided with exhaust and inserts 6 between cover half frame 10 and the dynamic model frame 80, and exhaust 6 bottoms of inserting are provided with the gas that is communicated with T shape air discharge duct 7 and compile the chamber, and gas compiles the chamber upper lateral zigzag air slot is set.
Be provided with collection chamber in the cover half frame 10, collection chamber is arranged on and the exhaust 6 corresponding positions of inserting.The gas of discharging from T shape air discharge duct 7 at first compiles indoor compiling at gas, is collected in the collection chamber after the effect of zigzag air slot, treats to enter atmosphere behind the branch mould.
Inlay on the dynamic model frame 80 to be provided with the die casting 4 positions corresponding die casting inlet that enters the mouth and insert 9, the die casting inlet is inserted and 9 is provided with and is communicated with the aluminium liquid that distribute running channel 5 and waters inlet 90.
Distributing running channel 5 is " Y " shape, is communicated with a pair of circular gate 2 respectively in the left and right sides two-way branch of " Y " shape distribution running channel 5.
Fig. 5 is a perspective view of utilizing the aerolite die casting of die casting of the present invention institute die cast.The shape of each parts is according to the shape and size design of required part in the mould.
Design is during die casting, processes Crossed Circle ingate 2 on the moving die insert 81 of the right mould 1 of compression mod, distributes running channel 5 and T shape air discharge duct 7, processes die casting inlet 4 on the cover half frame 10, touches 1 corresponding structure the processing with the right side of left mould 8 of die casting.Matched moulds, the cast aluminum alloy divides mould, ejects foundry goods 3 with thimble.Because adopted the structure of being made of the Crossed Circle charging Crossed Circle ingate 2, die casting inlet 4 and distribution running channel 5, metal liquid enters mold cavity 112 fast, can produce extremely thin wall.Owing to adopted T shape air discharge duct 7 structures, when molten metal was pressed into casting mold, exhaust faster prevented that foundry goods 3 from pore occurring and having reduced gas content in the foundry goods, make foundry goods 3 can carry out necessary heat treatment, and common die casting is not allow to heat-treat.
Claims (7)
1. the production technology of a ultrathin-wall and leakage-free aviation aluminium alloy castings is characterized in that may further comprise the steps:
A) make die casting, on the right mould (1) of die casting, process Crossed Circle ingate (2), die casting inlet (4) and distribute running channel (5); On left mould (8), process T shape air discharge duct (7), and after making good left mould (8) and right mould (1) assembling, be installed on the extruder;
B) cast is poured into 640-700 ℃ molten aluminum liquid the die casting inlet (4) that is positioned on the right mould (8);
C) the light pressure, the compressed head of extruder promotes molten aluminum night, enters Crossed Circle ingate (2) after making aluminium night by distribution running channel (5) distribution that is positioned at right mould (1), enters fast and is full of die cavity by Crossed Circle ingate (2), specific pressure is 50-70MPa, and extrusion time is 0.02-0.03 second;
D) suppress, after the light pressure of step 3, extruder is further suppressed aluminium liquid, and specific pressure is 70-100MPa, and extrusion time is 4-5 second;
When carrying out step b, c, d, when aluminium filled type night, gas was by being positioned at T shape air discharge duct (7) discharge of left mould (8) in the die cavity;
E) demoulding, the foundry goods behind extrusion solidification (3) takes off from extruder, promptly obtains the oxygen regulating valve foundry goods of oxygen mask.
2. production technology according to claim 1 is characterized in that the oxygen regulating valve foundry goods that also comprises the oxygen mask that described step e is obtained carries out the Infiltration Technics processing:
Earlier foundry goods is carried out hot water and clean, hot water temperature 50-60 ℃, vacuum drying, negative pressure is-0.080 to-0.110MPa, 24 ℃ of vacuum environment temperature;
Then foundry goods is put into the infiltration treatment fluid, infiltrated 4-6 hour;
After above-mentioned steps is finished, clean unnecessary infiltration treatment fluid on cast(ing) surface and the screw for 0.4-0.5MPa compressed air with pressure;
Then carry out the vacuum hot water solid solution: foundry goods is carried out hot water clean, hot water temperature 50-60 ℃, negative pressure is-0.080 to-0.110MPa, vacuum drying, and 24 ℃ of vacuum environment temperature are used to remove the solid matter on the foundry goods;
At last, foundry goods is put into 150-250 ℃ baking oven baking 10-25 minute, finish the infiltration treatment process.
3. production technology according to claim 2 is characterized in that described infiltration treatment fluid is made up of sodium metasilicate, specialist additive and water, and the part by weight of sodium metasilicate, specialist additive and water is 90-110: 1-2: 800-1500;
The component of specialist additive is thiocarbamide, cupric octoate, and the weight portion of described thiocarbamide is 70-80, and the weight portion of cupric octoate is 20-30, is 100% in thiocarbamide and cupric octoate.
4. production technology according to claim 1 is characterized in that the air discharge duct of T shape described in the step a (7) mainly is made up of exhaust chamber (70) and exhaust passage (71), and the cross-sectional area of exhaust chamber (70) is greater than the cross-sectional area of exhaust passage (71).
5. production technology according to claim 1 is characterized in that distributing described in the step a running channel (5) to be " Y " shape, is communicated with a pair of circular gate (2) respectively in the left and right sides two-way branch of " Y " shape distribution running channel (5).
6. production technology according to claim 1 or 5, it is characterized in that described Crossed Circle ingate (2) is made up of first ingate (20) and second ingate (21), first ingate (20) and second ingate (21) lay respectively at the both sides of die cavity (112) of the fixed die insert (11) of right mould (1); Perhaps Crossed Circle ingate (2) end is " Y " shape.
7. production technology according to claim 6 is characterized in that first ingate (20) of described Crossed Circle ingate (2) and second ingate (21) are symmetrical arranged.
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Denomination of invention: Production process of ultra-thin wall leak free aviation aluminum alloy castings Effective date of registration: 20231229 Granted publication date: 20120627 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: CHANGZHOU RANTO METALWORK Co.,Ltd. Registration number: Y2023980075002 |