CN105081277A - Low-pressure casting process of metal aluminium ring - Google Patents
Low-pressure casting process of metal aluminium ring Download PDFInfo
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- CN105081277A CN105081277A CN201510206793.7A CN201510206793A CN105081277A CN 105081277 A CN105081277 A CN 105081277A CN 201510206793 A CN201510206793 A CN 201510206793A CN 105081277 A CN105081277 A CN 105081277A
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Abstract
The invention relates to a low-pressure casting process of a metal aluminium ring. According to the low-pressure casting process, the metal aluminium ring is subjected to low-pressure casting by a one-die four-outlet die structure. The low-pressure casting process sequentially comprises the steps of core making, die clamping, casting, box opening for cleaning and sprue cutting-off, wherein a die subjected to die clamping is placed on a cast iron crucible smelter for low-pressure casting, wherein the casting temperature is 725-735 DEG C, the mold-filling velocity is 5-20 cm/s, the mold-filling time is 30-40 s, the boost pressure is 1-1.2 kPa, the holding pressure is 0.8 kPa, and the pressure maintaining time is 450-520 s; and pressure relief needs to be slowly carried out and quick pressure relief is forbidden. The low-pressure casting process has the advantages that the casting system adopts the one-die four-outlet structure, consumes less materials, lowers the manufacturing cost, realizes gain and emission reduction, and meanwhile, improves the product production efficiency.
Description
Technical field
The present invention relates to low pressure casting field, particularly a kind of metallic aluminium ring low-pressure casting process.
Background technology
Low pressure casting utilizes gas pressure that molten metal is pressed into casting mold, and a kind of casting method of crystallization and freezing under a certain pressure, due to molten metal from bottom to top, steady rising, can not produce splashing when filling type, atmosphere, pressure adjustable, do not need riser feeding, casting quality is good, and product yield is high, is specially adapted to the light-alloy such as aluminium, magnesium.
Metallic aluminium ring structure as depicted in figs. 1 and 2, comprises aluminium ring body 1, and the inwall of this aluminium ring body 1 is evenly distributed with some holes ringwise, and wherein a hole is through hole 2, and all the other holes are blind hole 3; At present when making above-mentioned metallic aluminium ring, adopting the mould structure that a mould one goes out, as shown in Figure 3, comprising cast gate 4, forming the product die cavity 5 of product, adopting weaknesses analysis during this mould product as follows:
(1) above-mentioned mould can produce waste material 6, and the material computing formula that this waste material 6 is wasted is as follows:
Wherein water open height h
cast gate=30mm, R
cast gate=80mm, waste material height h
waste material=30mm, waste material radius R
waste material=80mm, ρ
molten metal=2.7g/cm
3, substitute into formula (1) and calculate M=14.334kg.
(2) from casting efficiency, the production efficiency that a mould one goes out is low;
(3) analyze from heat treatment aspect, a mould one goes out when heat-treating, and waste part equally also will be heat-treated, and wastes a large amount of heat energy, simultaneously because excess calories concentrates on waste material component, easily produces thermal deformation; Thus bring processing difficulties to machined;
(4) compare from machined aspect, a mould one goes out to need to be cut down by waste material component, need to waste a large amount of artificial, and while cutting, Stress Release can cause aluminium circle to be out of shape, defective work increase.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind ofly can to enhance productivity, metallic aluminium ring low-pressure casting process that cost-saving and gain reduces discharging.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of metallic aluminium ring low-pressure casting process, and its innovative point is: the mould structure that described metallic aluminium ring adopts a mould four to go out carries out low pressure casting.
Further, the concrete steps of described low-pressure casting process are as follows:
(1) coremaking: utilize resin sand to make core according to aluminium ring-shaped; Then process is lighted at obtained core surface brush special-purpose fire-resistant coating; Finally core is sent into drying box, solidification temperature 150 DEG C-170 DEG C;
(2) matched moulds: first matched moulds before and after pair of metal external mold is placed on base, makes bottom the sprue in metal outer mold corresponding with cast gate on base, be provided with sprue, cross gate and Inner cast gate in this metal outer mold; Then be placed in metal outer mold by core, this core coordinates formation four axially to distribute successively along core lateral wall casting mold die cavity with metal outer mold, finally close die cap;
(3) pour into a mould: the mould after matched moulds in step (2) is placed on cast-iron pot smelting furnace and carries out low-pressure casting, pouring temperature: between 725 DEG C-735 DEG C, filling velocity: 5-20cm/s, filling time: 30-40s; Boost pressure: 1-1.2kPa, dwell pressure: 0.8kPa, dwell time: 450-520s; Must carry out lentamente during release, being sure not can not fast pressure relief;
(4) to unpack cleaning: naturally cool after 2 hours and unpack, open die cap, metal outer mold successively, then smash core time unpacking, taking-up workpiece blank also clears up the slitter edge at matched moulds place
(5) cast gate is cut off: frame work cuts off the waste material at the cast gate place of workpiece blank both sides.
Further, in described step (3), pouring temperature is 730 DEG C.
Further, in described step (3), the dwell time is 480s.
Further, in described step (2), the sprue ovalize in metal outer mold, it is highly for 375mm, major axis 110mm, minor axis are 80mm; Cross gate is rounded, its length 30mm, diameter 46mm.
The invention has the advantages that:
(1) low-pressure casting process of the present invention, adopts a mould four to go out process mould; From production efficiency, once can produce several aluminium rings, improve the production efficiency of product;
Analyze from heat treatment aspect, a traditional mould one goes out product, heat-treats, waste material component equally also will be heat-treated, and wastes a large amount of heat energy, simultaneously because excess calories concentrates on waste material component, easy generation thermal deformation, thus bring processing difficulties to machined; And this name one modulus goes out aluminium ring has cut complete before heat treatment, as long as put smooth when heat treatment, thermal deformation would not be there is;
Compare from machined aspect, a traditional mould one goes out, and needs waste material component to cut down, and need to waste a large amount of artificial, and while cutting, Stress Release can cause aluminium circle be out of shape, defective work increase; The product adopting a modulus to go out, does not have the danger of Stress Release, and only need normal machined, process time shortens greatly, and production efficiency is obviously better than a traditional mould one and goes out product;
(2) waste material in running gate system of the present invention comprises the waste material produced in a pair sprue and four casting mold die cavity both sides cross gates, and its computing formula is as follows:
Wherein sprue height h
sprue=375mm, semi-major axis a
sprue=55mm, semi-minor axis b
sprue=40mm, cross gate height h
cross gate=30mm, cross gate radius R
cross gate=23mm, ρ
molten metal=2.7g/cm
3, substitute into formula (2) and calculate M=15.075kg; And traditional four material weight that casting mold is wasted are 14.334*4=57.2kg, as can be seen from calculating, the waste material that running gate system of the present invention produces is few, the production cost of saving, and gain reduces discharging.
Accompanying drawing explanation
Fig. 1 is the structural representation of metal current aluminium ring.
Fig. 2 is the sectional view of metal current aluminium ring.
The structural representation of mould when Fig. 3 is the making of metal current aluminium ring.
Fig. 4 is the structural representation of mould in a kind of metallic aluminium ring of the present invention low-pressure casting process.
Fig. 5 is the top view of mould in a kind of metallic aluminium ring of the present invention low-pressure casting process.
Fig. 6 is the sectional view of A-A line in Fig. 5.
Fig. 7 is the internal structure schematic diagram of metal outer mold in a kind of metallic aluminium ring of the present invention low-pressure casting process.
Fig. 8 is the structural representation of core in a kind of metallic aluminium ring of the present invention low-pressure casting process.
Fig. 9 is the top view of core in a kind of metallic aluminium ring of the present invention low-pressure casting process.
Detailed description of the invention
Embodiment 1
The invention discloses a kind of metallic aluminium ring low-pressure casting process, the mould structure that metallic aluminium ring adopts a mould four to go out carries out low pressure casting, effectively improves production efficiency.
A mould four involved in above-mentioned low-pressure casting process goes out mould structure, as Fig. 4 to Fig. 9 comprises sprue 7, cross gate 8 and Inner cast gate 9, the die cavity of casting mold is by a base 10, matched moulds before and after a pair is also arranged on the metal outer mold 11 of base 10 upper surface, be built in core 12 in pair of metal external mold 11 and a pair respectively matched moulds form at die cap 13 matched moulds of pair of metal external mold 11 upper surface, madial wall before and after pair of metal external mold 11 after matched moulds coordinates formation four along the axial coaxial casting mold die cavity 14 distributed successively of core 12 lateral wall with the lateral wall of core 12, the madial wall of the metal outer mold 11 of each casting mold die cavity 14 region has an annular groove 15, the lateral wall of the core 12 of each casting mold die cavity 14 region is evenly distributed with 12 convex bodys ringwise, wherein a convex body 16 is for the through hole 2 of shaping aluminium ring 1, other 11 convex bodys 17 are for the blind hole 3 of shaping aluminium ring 1, sprue 7 has a pair, be symmetricly set on the left and right sides of pair of metal external mold 11, the both sides that each annular die cavity is corresponding with sprue 7 are provided with Inner cast gate 9, base 10 is provided with a pair respectively with the cast gate 18 be communicated with bottom a pair sprue 7, the bottom of sprue 7 is communicated with the stalk of low pressure casting by cast gate 18, and its top is communicated with by the Inner cast gate 9 of some cross gates 8 with each casting mold die cavity 14 successively, the center of die cap 13 has an exhaust outlet 19, in order to make core 12 well be supported on base 10, and in order to reduce the cost of manufacture of core 12, core 12, in cylinder-shaped, arrange an annular convex 20 at center, base 10 upper surface, is just supported in the annular convex 20 of base 10 bottom core 12, in addition conveniently core 12 is located, and has a detent 21 bottom core 12, has the positioning convex body 22 of a correspondence in annular convex 20.
Above-mentioned mould is utilized to carry out the processing step of low pressure casting specific as follows:
The first step, coremaking: utilize resin sand to make core 12 according to aluminium ring-shaped; Then process is lighted at obtained core 12 surface brush special-purpose fire-resistant coating; Finally core 12 is sent into drying box, solidification temperature 150 DEG C-170 DEG C;
Second step, matched moulds: first matched moulds before and after pair of metal external mold 11 is placed on base 10, makes bottom the sprue 7 in metal outer mold 11 corresponding with the cast gate 18 on base 1, be provided with sprue 7, cross gate 8 and Inner cast gate 9 in this metal outer mold 11; Then be placed in pair of metal external mold 11 by core 12, this core 11 coordinates formation four axially to distribute successively along core lateral wall casting mold die cavity 14 with metal outer mold 12, finally close die cap 13;
3rd step, cast: the mould after matched moulds in second step is placed on cast-iron pot smelting furnace and carries out low-pressure casting, pouring temperature: between 725 DEG C, filling velocity: 5-20cm/s, filling time: 30s; Boost pressure: 1-1.2kPa, dwell pressure: 0.8kPa, dwell time: 480s; Must carry out lentamente during release, being sure not can not fast pressure relief;
4th step, cleaning of unpacking: naturally cool after 2 hours and unpack, open die cap 13, metal outer mold 11 time unpacking successively, then smash core 12, taking-up workpiece blank also clears up the slitter edge at matched moulds place;
5th step, cuts off cast gate: frame work cuts off the waste material at the cast gate place of workpiece blank both sides;
In the present embodiment, sprue 7 ovalize in second step, it is highly for 375mm, major axis 110mm, minor axis are 80mm; Cross gate 8 is rounded, its length 30mm, diameter 46mm, and the waste material computing formula produced is as follows:
Wherein sprue height h
sprue=375mm, semi-major axis a
sprue=55mm, semi-minor axis b
sprue=40mm, cross gate height h
cross gate=30mm, cross gate radius R
cross gate=23mm, ρ
molten metal=2.7g/cm
3, substitute into formula (2) and calculate M=15.075kg; And traditional four material weight that casting mold is wasted are 14.334*4=57.2kg, as can be seen from calculating, low-pressure casting process of the present invention, materials are few, the production cost of saving.
Embodiment 2
The present embodiment, on the basis of embodiment 1, changes cast step, pouring temperature: between 730 DEG C, filling velocity: 5-20cm/s, filling time: 35s; Boost pressure: 1-1.2kPa, dwell pressure: 0.8kPa, dwell time: 480s.
Embodiment 3
The present embodiment, on the basis of embodiment 1, changes cast step, pouring temperature: between 735 DEG C, filling velocity: 5-20cm/s, filling time: 35s; Boost pressure: 1-1.2kPa, dwell pressure: 0.8kPa, dwell time: 480s.
More than show and describe general principle of the present invention and principal character.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a metallic aluminium ring low-pressure casting process, is characterized in that: the mould structure that described metallic aluminium ring adopts a mould four to go out carries out low pressure casting.
2. metallic aluminium ring low-pressure casting process according to claim 1, is characterized in that: the concrete steps of described low-pressure casting process are as follows:
Coremaking: utilize resin sand to make core according to aluminium ring-shaped; Then process is lighted at obtained core surface brush special-purpose fire-resistant coating; Finally core is sent into drying box, solidification temperature 150 DEG C-170 DEG C;
Matched moulds: first matched moulds before and after pair of metal external mold is placed on base, makes bottom the sprue in metal outer mold corresponding with cast gate on base, be provided with sprue, cross gate and Inner cast gate in this metal outer mold; Then be placed in metal outer mold by core, this core coordinates formation four axially to distribute successively along core lateral wall casting mold die cavity with metal outer mold, finally close die cap;
Cast: the mould after matched moulds in step (2) is placed on cast-iron pot smelting furnace and carries out low-pressure casting, pouring temperature: between 725 DEG C-735 DEG C, filling velocity: 5-20cm/s, filling time: 30-40s; Boost pressure: 1-1.2kPa, dwell pressure: 0.8kPa, dwell time: 450-520s; Must carry out lentamente during release, being sure not can not fast pressure relief;
To unpack cleaning: naturally cool after 2 hours unpacking, open die cap, metal outer mold successively time unpacking, then smash core, take out four workpiece blanks and clear up the slitter edge at matched moulds place
Cut off cast gate: frame work cuts off the waste material at the cast gate place of four workpiece blank both sides.
3. metallic aluminium ring low-pressure casting process according to claim 2, is characterized in that: in described step (3), pouring temperature is 730 DEG C.
4. metallic aluminium ring low-pressure casting process according to claim 2, is characterized in that: in described step (3), the dwell time is 480s.
5. metallic aluminium ring low-pressure casting process according to claim 2, is characterized in that: in described step (2), the sprue ovalize in metal outer mold, and it is highly for 375mm, major axis 110mm, minor axis are 80mm; Cross gate is rounded, its length 30mm, diameter 46mm.
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Cited By (8)
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| CN107130137A (en) * | 2017-06-27 | 2017-09-05 | 华南理工大学 | A kind of low-pressure casting process of environmentally friendly silizin tap |
| CN107876732A (en) * | 2017-12-06 | 2018-04-06 | 博维恩冷冻科技（苏州）有限公司 | A kind of accurate high intensity compressor screw and its casting technique |
| CN107936658A (en) * | 2017-12-07 | 2018-04-20 | 博维恩冷冻科技（苏州）有限公司 | A kind of anti-corrosion electric pump case and its casting technique |
| CN107955538A (en) * | 2017-12-08 | 2018-04-24 | 苏州胤宗智能科技有限公司 | A kind of drop resistant rub resistance dumbbell and its casting technique |
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| CN109434024A (en) * | 2018-12-25 | 2019-03-08 | 青岛金环汽配制造有限公司 | A kind of process equipment and processing technology of gear ring blank |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107936658A (en) * | 2017-12-07 | 2018-04-20 | 博维恩冷冻科技（苏州）有限公司 | A kind of anti-corrosion electric pump case and its casting technique |
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| CN108644592A (en) * | 2018-05-28 | 2018-10-12 | 倍德力能源装备（江苏）有限公司 | A kind of high accurancy and precision constant supporting spring hanger |
| CN108847639A (en) * | 2018-06-05 | 2018-11-20 | 江苏中讯电力科技有限公司 | A kind of anti-corrosion high pressure common phase bus duct |
| CN108817238A (en) * | 2018-06-08 | 2018-11-16 | 南京惠德机械有限公司 | A kind of wearability precision is carved characters squeeze riveter equipment and its heat treatment process |
| CN109434024A (en) * | 2018-12-25 | 2019-03-08 | 青岛金环汽配制造有限公司 | A kind of process equipment and processing technology of gear ring blank |
| CN109434024B (en) * | 2018-12-25 | 2020-05-08 | 青岛金环汽配制造有限公司 | Machining equipment and machining process for gear ring blank |
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