CN107737874A - Heat resisting cast steel turbocharger turbine housing iron die sand casting process - Google Patents
Heat resisting cast steel turbocharger turbine housing iron die sand casting process Download PDFInfo
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- CN107737874A CN107737874A CN201710862990.3A CN201710862990A CN107737874A CN 107737874 A CN107737874 A CN 107737874A CN 201710862990 A CN201710862990 A CN 201710862990A CN 107737874 A CN107737874 A CN 107737874A
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- Prior art keywords
- sand
- mould
- heat resisting
- turbocharger turbine
- turbine housing
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 64
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000007528 sand casting Methods 0.000 title claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 110
- 238000005266 casting Methods 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 230000000630 rising effect Effects 0.000 claims description 26
- 238000000465 moulding Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- -1 using covering Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supercharger (AREA)
Abstract
The present invention is a kind of heat resisting cast steel turbocharger turbine housing iron die sand casting process, it is related to component of machine casting technology field, is designed to solve the problems, such as made from the processing of existing casting technique that turbocharger turbine shell cast defect is more, yield rate is low and product yield is low.The heat resisting cast steel turbocharger turbine housing iron die sand casting process includes device for sand coated iron mould mould and smelting technology, and device for sand coated iron mould mould includes hull shape mould, and what the inner chamber of hull shape mould was provided with different-thickness covers layer of sand.During casting, core is put into hull shape mould, the molten steel of melting is injected into the inner chamber of hull shape mould through running gate system, shaping.In smelting technology, for the tapping temperature of molten steel between 1,700 1710 DEG C, the pouring temperature of molten steel often pours into a mould the time control of 0.5t molten steel between 6 7min between 1,650 1670 DEG C.Heat resisting cast steel turbocharger turbine housing iron die sand casting process provided by the invention is used to process heat resisting cast steel turbocharger turbine housing.
Description
Technical field
The present invention relates to component of machine casting technology field, more particularly to a kind of heat resisting cast steel turbocharger turbine shell
Body iron die sand casting process.
Background technology
With the development of high-end engine, turbocharger has been increasingly becoming the standard configuration of high-end engine.Along with big work(
The exploitation of rate engine, its heatproof to turbocharger require also more and more higher, it is sometimes desirable to the work temperature of turbocharger
Degree reaches 1050-1150 DEG C, even more high.However, the turbocharger housing of the cast iron materials such as conventional magnesium iron, silicon molybdenum, nickelic
Requirement can not be met.In view of the above-mentioned problems, some enterprises propose the turbocharger housing using heat resisting cast steel material, but
Because the smelting temperature of heat resisting cast steel material is high, molten steel flow difference and smelting technology are difficult, along with answering for turbocharger housing
Miscellaneous structure and high-precision requirement so that casting is very difficult.Moreover, the obtained turbocharger housing defect of casting is more, yield rate
It is low, and product yield is low.
The content of the invention
It is an object of the invention to provide a kind of heat resisting cast steel turbocharger turbine housing iron die sand casting process, with
Solve made from the processing of existing casting technique that turbocharger turbine shell cast defect is more, yield rate is low and product yield is low
Technical problem.
Heat resisting cast steel turbocharger turbine housing iron die sand casting process provided by the invention, including for shaping
Device for sand coated iron mould mould and the smelting technology suitable for heat resisting cast steel turbocharger turbine housing.
The device for sand coated iron mould mould includes hull shape mould, and what the inner chamber of the hull shape mould was provided with different-thickness covers sand
Layer, at the thicker position of casting, cover that layer of sand is relatively thin, at the relatively thin position of casting, it is thicker to cover layer of sand.
Running gate system is provided with the device for sand coated iron mould mould.
During casting, the core matched with casting is put into the hull shape mould, the molten steel of melting injects through running gate system
To the inner chamber of the hull shape mould, it is molded under the collective effect of the core and the hull shape mould.
In the smelting technology, the tapping temperature of molten steel is between 1700-1710 DEG C, and the pouring temperature of molten steel is in 1650-
Between 1670 DEG C, the time control of 0.5t molten steel is often poured into a mould between 6-7min.
Further, the device for sand coated iron mould mould is one, a type；
Or the device for sand coated iron mould mould is a type more than one piece.
Further, the layer of sand that covers is obtained by high injection sand.
Mo(u)ld top half dynamic model is covered on mo(u)ld top half cover half, forms mo(u)ld top half, and mo(u)ld bottom half dynamic model is covered on mo(u)ld bottom half cover half, forms mo(u)ld bottom half,
Mo(u)ld top half is covered on mo(u)ld bottom half, forms the hull shape mould.
The heater for being heated for it is provided with the hull shape mould, reaches the solidification temperature of precoated sand
Afterwards, precoated sand is injected into the mo(u)ld top half dynamic model and the mo(u)ld top half cover half and the mo(u)ld bottom half dynamic model by the sand mouth of penetrating of the hull shape mould
In accommodating cavity between the mo(u)ld bottom half cover half, manufacture and described cover layer of sand.
The sand mouth of penetrating is at least one.
Further, exhaust duct is additionally provided with the hull shape mould, one end of the exhaust duct connects with the accommodating cavity
Logical, the other end connects with external environment, and the exhaust duct is arranged on the opening position that precoated sand is not easy to reach.
Further, the heater includes electric heater unit.
The temperature of the mo(u)ld top half dynamic model is higher than the temperature of the mo(u)ld top half cover half, and the temperature of the mo(u)ld bottom half dynamic model is higher than under described
The temperature of type cover half.
Further, the proportional outline more than the casting in the inner chamber of the hull shape mould, proportionality coefficient 2.0-
2.3%.
Further, the running gate system includes cast gate and ingate, the ingate close to the hull shape mould into
Type inner chamber is set；The ingate is at least one.
The cast gate is connected with the molding cavity by least one ingate.
Further, the connecting portion between the molding cavity of the ingate and the hull shape mould is provided with into fire
Mouth, it is described enter nozzles length be 4-6mm.
Further, the running gate system also includes rising head, and the rising head is arranged at the heavy wall thermal center of the casting, institute
Rising head is stated to connect with the molding cavity.
Further, the quantity of the ingate matches with the number of packages that the device for sand coated iron mould mould single is molded, and each institute
The rising head of the ingate close to each casting corresponding position is stated to set.
Heat resisting cast steel turbocharger turbine housing device for sand coated iron mould process bands of the present invention come beneficial effect be：
By setting device for sand coated iron mould mould and the smelting technology suitable for heat resisting cast steel turbocharger turbine housing, its
In, device for sand coated iron mould mould is used for the shaping of casting, including hull shape mould.What the inner chamber of hull shape mould was provided with different-thickness covers sand
Layer, specifically, at the thicker position of casting, cover that layer of sand is relatively thin, it is thicker to cover layer of sand at the thicker position of casting.Also, in swage
Cover the running gate system being additionally provided with sand mo(u)ld tool for pouring into a mould molten steel.When being cast, it will be put into the core that casting matches
In hull shape mould, the molten steel of melting is injected to the inner chamber of hull shape mould by running gate system, makes it in core and hull shape mould
It is molded under collective effect.Wherein, the tapping temperature of molten steel is controlled between 1700-1710 DEG C, and pouring temperature is controlled in 1650-
Between 1670 DEG C, and the time control of 0.5t molten steel is often poured into a mould between 6-7min.
It is casting thermal resistance and the ratio for covering layer of sand thermal resistance to define k1, and k2 is hull shape mould thermal resistance and the ratio for covering layer of sand thermal resistance
Value, the heat resisting cast steel turbocharger turbine housing iron die sand casting process is being utilized to heat resisting cast steel turbocharger turbine
During housing is cast, heat in casting and will cover between layer of sand and cover and be transmitted between layer of sand and hull shape mould.
As k1≤1, k2≤1, layer of sand is covered within normal thickness range (generally, the normal thickness for covering layer of sand be 8-10mm), is cast
The cooling velocity of part will reduce with the increase for covering sand layer thickness；When the thickness for covering layer of sand exceedes a certain thickness (such as：20mm)
After, cooling of the hull shape mould to casting no longer has an impact；As k1 >=1, k2 >=1, it is relatively thin to cover sand layer thickness, now, shell
Shape mould is directly cooled down using chilling action to casting.
By hull shape mould difference cover sand layer thickness when different cooling effects, using cover layer of sand it is relatively thin when hull shape mould
Chilling action the thermal center of casting is cooled down, even eliminate the complicated knot of heat resisting cast steel turbocharger turbine housing to improve
Shrinkage porosite and shrinkage cavity defect at structure thermal center；Meanwhile using cover layer of sand it is thicker when hull shape mould insulation effect to casting thin-walled at
Cool down faster position to be incubated, so as to reduce the histological difference at casting heavy wall and thin-walled, substantially increase the production of casting
Quality.
When carrying out smelting and pouring, by the way that the tapping temperature of molten steel is controlled between 1700-1710 DEG C, to a certain degree
On avoid the burning loss of alloy serious phenomenon caused by molten steel temperature is too high, ensure that the quality of casting, also improve simultaneously
Because molten steel temperature is too low without tractable situation.Also, by the way that pouring temperature control between 1650-1670 DEG C, will be poured
Note speed control and pour into a mould 0.5t molten steel in every 6-7min, also avoid to a certain extent because of the product contracting that temperature is too high and occurs
The casting flaw such as molten steel oxidation caused by pine tendency is big, temperature is too low and occurs cold shut and the duration of pouring are longer.This is heat-resisting
Processing and manufacturing tool of the cast steel turbocharger turbine housing iron mould casting technique for heat resisting cast steel turbocharger turbine housing
It is significant.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that the swage in heat resisting cast steel turbocharger turbine housing iron die sand casting process of the embodiment of the present invention covers
The structural representation of sand mo(u)ld tool；
Fig. 2 is the A-A sectional views in Fig. 1；
Fig. 3 is that swage covers in heat resisting cast steel turbocharger turbine housing iron die sand casting process of the embodiment of the present invention
The structural representation of mo(u)ld top half cover half in sand mo(u)ld tool；
Fig. 4 is the B-B sectional views in Fig. 3；
Fig. 5 is the C-C sectional views in Fig. 3；
Fig. 6 is that swage covers in heat resisting cast steel turbocharger turbine housing iron die sand casting process of the embodiment of the present invention
The structural representation of mo(u)ld bottom half cover half in sand mo(u)ld tool；
Fig. 7 is the D-D sectional views in Fig. 6；
Fig. 8 is the E-E sectional views in Fig. 6.
Icon：10- ingates；The rising heads of 20- first；30- first enters nozzles；40- cast models；50- second enters nozzles；
The rising heads of 60- second；At 70- model flange wall thickness；At 80- model conventional wall thickness；At 90- model boss wall thickness；In 100- models
At portion's angle wall thickness；110- cast gates；The rising heads of 120- the 3rd；130- hull shape moulds；140- covers layer of sand；131- mo(u)ld top half cover half；132-
Mo(u)ld bottom half cover half；141- thickness covers layer of sand；142- is thin to cover layer of sand.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the technology below in conjunction with accompanying drawing to the present invention
Scheme carries out clear, complete description.Obviously, described embodiment is only the part of the embodiment of the present invention, rather than entirely
The embodiment in portion.Based on the embodiment in the present invention, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, the orientation or position of the instruction such as term " on ", " under ", " interior ", " outer "
The relation of putting is based on orientation shown in the drawings or position relationship, it is only for and it is easy to the description present invention and simplifies description, and
It is not instruction or implies signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore
It is not considered as limiting the invention.
In the description of the invention, it is necessary to which explanation, unless otherwise clearly defined and limited, term " installation ", " connects
Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；Can be straight
Connect connected, can also be indirectly connected by intermediary, can be the connection of two element internals.For the common skill of this area
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As depicted in figs. 1 and 2, a kind of heat resisting cast steel turbocharger turbine housing device for sand coated iron mould casting is present embodiments provided
Make technique, including the device for sand coated iron mould mould for shaping and the smelter suitable for heat resisting cast steel turbocharger turbine housing
Skill.Specifically, device for sand coated iron mould mould includes hull shape mould 130, what the inner chamber of hull shape mould 130 was provided with different-thickness covers layer of sand
140, at the thicker position of heat resisting cast steel turbocharger turbine housing, set it is relatively thin cover layer of sand 140, and in its relatively thin portion
Position, set and thicker cover layer of sand 140.Also, it is additionally provided with running gate system on device for sand coated iron mould mould., will be with when being cast
The core of casting matching is put into hull shape mould 130, and the molten steel of melting is injected into the inner chamber of hull shape mould 130 through running gate system,
It is molded under the collective effect of core and hull shape mould 130.In smelting technology, the tapping temperature of molten steel is controlled in 1700-1710
Between DEG C, the pouring temperature of molten steel is controlled between 1650-1670 DEG C, and often pours into a mould the time control of 0.5t molten steel in 6-7min
Between.
It is heat resisting cast steel turbocharger turbine housing thermal resistance and the ratio for covering the thermal resistance of layer of sand 140 to define k1, and k2 is hull shape
The thermal resistance of mould 130 and the ratio for covering the thermal resistance of layer of sand 140, are cast using the heat resisting cast steel turbocharger turbine housing device for sand coated iron mould
Make during technique casts to heat resisting cast steel turbocharger turbine housing, heat will be in heat resisting cast steel turbocharger
Turbine shroud and cover between layer of sand 140 and cover and transmitted between layer of sand 140 and hull shape mould 130.As k1≤1, k2≤1,
Layer of sand 140 is covered within normal thickness range (generally, the normal thickness for covering layer of sand 140 is 8-10mm), heat resisting cast steel turbine
The cooling velocity of booster turbine housing will reduce with the increase for covering the thickness of layer of sand 140；When the thickness for covering layer of sand 140 exceedes
A certain thickness is (such as：After 20mm), cooling of the hull shape mould 130 to casting no longer has an impact；As k1 >=1, k2 >=1, cover
The thinner thickness of layer of sand 140, now, hull shape mould 130 is directly using chilling action to heat resisting cast steel turbocharger turbine housing
Cooled down.With reference to Fig. 2, it can be seen that put by the model of the i.e. heat resisting cast steel turbocharger turbine housing of cast model 40
Put after the inner chamber of hull shape mould 130, due at model flange wall thickness at 70, model boss wall thickness 90 and model inside angle
100 design is thicker at wall thickness, therefore sets relatively thin cover layer of sand 140 herein；And 80 design is relatively thin at model conventional wall thickness, therefore
Set herein and thicker cover layer of sand 140.
By different cooling effects of the hull shape mould 130 when difference covers 140 thickness of layer of sand, using covering, layer of sand 140 is relatively thin
When hull shape mould 130 chilling action the thermal center of heat resisting cast steel turbocharger turbine housing is cooled down, to improve even
Eliminate the shrinkage porosite at heat resisting cast steel turbocharger turbine housing labyrinth thermal center and shrinkage cavity defect；Meanwhile using covering layer of sand
140 it is thicker when hull shape mould 130 insulation effect to cooling down faster portion at heat resisting cast steel turbocharger turbine housing thin-walled
Position is incubated, and so as to reduce the histological difference at heat resisting cast steel turbocharger turbine housing heavy wall and thin-walled, is greatly improved
The product quality of heat resisting cast steel turbocharger turbine housing.
When carrying out smelting and pouring, by the way that the tapping temperature of molten steel is controlled between 1700-1710 DEG C, to a certain degree
On avoid the burning loss of alloy serious phenomenon caused by molten steel temperature is too high, ensure that heat resisting cast steel turbocharger turbine shell
The quality of body, while also improve because molten steel temperature is too low without tractable situation.Also, by the way that pouring temperature control is existed
Between 1650-1670 DEG C, poring rate control is poured into a mould into 0.5t molten steel in every 6-7min, also avoids Yin Wen to a certain extent
Spend product shrinkage porosite tendency that is high and occurring is big, temperature is too low and occurs cold shut and the duration of pouring it is longer caused by molten steel oxygen
The casting flaws such as change.The heat resisting cast steel turbocharger turbine housing iron mould casting technique is for heat resisting cast steel turbocharger whirlpool
It is significant to take turns the processing and manufacturing of housing, greatly meets the heatproof demand of turbocharger.
It should be noted that in the present embodiment, " the thicker position of heat resisting cast steel turbocharger turbine housing " refers to it
Wall thickness has exceeded conventional wall thickness, and in the structure of heat resisting cast steel turbocharger turbine housing, conventional wall thickness is usually 3.5-
4.5mm。
It should also be noted that, in the present embodiment, the tapping temperature of molten steel is specifically as follows 1705 DEG C, and pouring temperature is specific
It can be 1655 DEG C, the duration of pouring is specifically as follows 6min30s.
In addition, when 2-3 times that the actual somewhere wall thickness of product exceedes conventional wall thickness is even more more, the thickness of layer of sand 140 is covered
Then cover the 2/3,1/2 even more thin of the thickness of layer of sand 140 to be conventional, now, in layer of sand 140 is covered adjacent two it is thin cover layer of sand 142 it
Between boundary using smoothly transitting.Such setting, the stress concentration phenomenon after formed product is greatly reduced, is further carried
The high reliability of the present embodiment heat resisting cast steel turbocharger turbine housing iron die sand casting process.
In the present embodiment, the thicker position of heat resisting cast steel turbocharger turbine housing can include enclosure corner, flange,
Angle, boss and transitional region etc..
In addition, in the heat resisting cast steel turbocharger turbine housing iron die sand casting process, device for sand coated iron mould mould can be with
For one, a type, or a type more than one piece.Specifically, as shown in figure 1, in the present embodiment, device for sand coated iron mould casting mould is one
Four, type, i.e., in one-step casting forming process, it can simultaneously pour and outpour four heat resisting cast steel turbocharger turbine housing productions
Product.Such setting, substantially increase the production efficiency of the present embodiment heat resisting cast steel turbocharger turbine shell product.And
And in the present embodiment, four mould subelements are in a center of symmetry to be arranged on the outer of cast gate 110 centered on cast gate 110
Week.
In the present embodiment, covering layer of sand 140 can be realized by high injection sand.Specifically, mo(u)ld top half dynamic model is covered and determined in mo(u)ld top half
On mould 131, mo(u)ld top half is formed, mo(u)ld bottom half dynamic model is covered on mo(u)ld bottom half cover half 132, forms mo(u)ld bottom half, in the presence of Clamping System, mo(u)ld top half
Cover on mo(u)ld bottom half, form hull shape mould 130.The heater for being heated for it is provided with hull shape mould 130, when
After the solidification temperature for reaching precoated sand, precoated sand is injected into mo(u)ld top half dynamic model and mo(u)ld top half cover half 131 by the sand mouth of penetrating of hull shape mould 130
And in the accommodating cavity between mo(u)ld bottom half dynamic model and mo(u)ld bottom half cover half 132, manufacture and cover layer of sand 140.The mo(u)ld top half cover half 131 penetrated after the completion of sand is such as
Shown in Fig. 3-Fig. 5, mo(u)ld bottom half cover half 132 as Figure 6-Figure 8, can be seen that by each sectional view, be formed and product corresponding positions on cover half
The thickness for putting matching covers layer of sand 141 and thin covers layer of sand 142.
High injection sand speed is fast, efficiency high.Also, in order to further improve penetrate sand speed and improve precoated sand penetrate reality
Degree, can be set on hull shape mould 130 it is multiple penetrate Sha Kou, simultaneously penetrate sand operation.
In addition, in the present embodiment, exhaust duct can also be set on hull shape mould 130.Specifically, one end and the appearance of exhaust duct
Chamber connection is put, the other end connects with external environment, also, exhaust duct is arranged on the opening position that precoated sand is not easy to reach.
By setting exhaust duct, it ensure that precoated sand can reliably be set to each opening position of accommodating cavity, enter one
Step improves the casting reliability of the heat resisting cast steel turbocharger turbine shell product.
It should be noted that can be the form of above-mentioned setting exhaust duct in the present embodiment, on hull shape mould 130, but not
This is limited only to, other structures form can also be used, such as：Venting plug etc., as long as it passes through the row of this structure type
Device of air, precoated sand can be made smoothly to reach and treat overlay film opening position.
In the present embodiment, heater includes electric heater unit.Electric heater unit is easily controllable, easy to operate.Also, this
In embodiment, the temperature of mo(u)ld top half dynamic model is higher than the temperature of mo(u)ld top half cover half 131, and the temperature of mo(u)ld bottom half dynamic model is higher than mo(u)ld bottom half cover half 132
Temperature.Such setting, it is ensured that when dynamic model is removed from cover half, precoated sand stably can be solidificated on cover half.
In the present embodiment, the temperature of cover half can be controlled between 225 ± 5 DEG C, and by the temperature control of dynamic model 235 ±
Between 5 DEG C.Here, said temperature is only that to give cover half, dynamic model temperature and dynamic model temperature specific higher than one of cover half temperature
Embodiment, can not be as the limitation to temperature.In practical operation, operating personnel can be specifically right according to the model of precoated sand
The temperature of fixed half and moving half is set, and to ensure that precoated sand reliably can be solidificated on cover half, covers layer of sand so as to be formed
140。
In addition, in the present embodiment, the proportional outline more than casting in inner chamber of hull shape mould 130.Wherein, proportionality coefficient
Can be 2.0-2.3%.Such setting, the heat resisting cast steel turbocharger turbine shell product after improving because of shaping is because of warm
The situation that final products reduce caused by swollen shrinkage deformation, further ensures the heat resisting cast steel turbocharger turbine housing
The reliability of iron die sand casting process.
It should be noted that above-mentioned " proportional to be more than " refers to：Each opening position of the inner chamber of hull shape mould 130 all compared to
The outline of casting expands identical multiple, it is scaling.
Continue referring to Fig. 1 and Fig. 2, in the present embodiment, running gate system can include cast gate 110 and ingate 10.Wherein,
Ingate 10 is set close to the molding cavity of hull shape mould 130, and ingate 10 is at least one.Cast gate 110 and molding cavity
Between connected by ingate 10.Specifically, in the casting technique of four, one type of the present embodiment, ingate 10 includes four, often
Molding cavity of one ingate 10 with each mould subelement connects.By the way that ingate 10 is set close to shaping, significantly
The flow distance of molten steel is reduced, reduces the generation of casting flaw.Also, the shaping of each ingate 10 and hull shape mould 130
It is additionally provided with connecting portion between inner chamber into nozzles, specifically, the first rising head 20 at the inlet flange wall thickness of product with setting
It is equipped with first and enters nozzles 30, the second rising head 60 enters nozzles 50 with being provided with second at the outlet flange wall thickness of product.First enters fire
Mouth 30 and the second length for entering nozzles 50 can be 4-6mm.Such setting, avoid to a certain extent because molten steel is respectively entering
The situation that molten steel can not flow in molding cavity caused by being solidified at nozzles, further ensures the present embodiment heat resisting cast steel
The reliability of turbocharger turbine housing iron die sand casting process.
Continue referring to Fig. 1 and Fig. 2, in the present embodiment, the running gate system also includes rising head, and rising head is arranged on heat resisting cast steel
The heavy wall thermal center opening position of turbocharger turbine housing, also, rising head connects with molding cavity.
It is specifically, single for each mould cast to the heat resisting cast steel turbocharger turbine housing
It is provided with three rising heads in member, respectively the first rising head 20, the second rising head 60 and the 3rd rising head 120, wherein, the first rising head 20
It is arranged at the inlet flange wall thickness of product, the second rising head 60 is arranged at the outlet flange wall thickness of product, and the 3rd rising head 120 is set
Put at the boss of product side.By setting rising head so that molten steel can be supplemented casting at any time, reduce casting hair
Raw shrinkage porosite and the risk of necking.
In addition, in the present embodiment, each ingate 10 can be set close to the first rising head 20, i.e., as far as possible with inlet flange
The first rising head 20 fitting at wall thickness is set.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in previous embodiment, either which part or all technical characteristic are equal
Replace；And these modifications or replacement, the essence of appropriate technical solution is departed from the model of technical scheme of the embodiment of the present invention
Enclose.
Claims (10)
1. a kind of heat resisting cast steel turbocharger turbine housing iron die sand casting process, it is characterised in that including for being molded
Device for sand coated iron mould mould and the smelting technology suitable for heat resisting cast steel turbocharger turbine housing；
The device for sand coated iron mould mould includes hull shape mould (130), and the inner chamber of the hull shape mould (130) is provided with different-thickness
Cover layer of sand (140), at the thicker position of casting, it is relatively thin to cover layer of sand (140), at the relatively thin position of casting, cover layer of sand (140) compared with
It is thick；
Running gate system is provided with the device for sand coated iron mould mould；
During casting, the core matched with casting is put into the hull shape mould (130), the molten steel of melting injects through running gate system
To the inner chamber of the hull shape mould (130), it is molded under the collective effect of the core and the hull shape mould (130)；
In the smelting technology, the tapping temperature of molten steel is between 1700-1710 DEG C, and the pouring temperature of molten steel is in 1650-1670
Between DEG C, the time control of 0.5t molten steel is often poured into a mould between 6-7min.
2. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 1, its feature exist
In the device for sand coated iron mould mould is one, a type；
Or the device for sand coated iron mould mould is a type more than one piece.
3. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 1, its feature exist
In the layer of sand (140) that covers is obtained by high injection sand；
Mo(u)ld top half dynamic model is covered on mo(u)ld top half cover half (131), forms mo(u)ld top half, and mo(u)ld bottom half dynamic model is covered on mo(u)ld bottom half cover half (132), is formed
Mo(u)ld bottom half, mo(u)ld top half are covered on mo(u)ld bottom half, form the hull shape mould (130)；
The heater for being heated for it is provided with the hull shape mould (130), reaches the solidification temperature of precoated sand
Afterwards, precoated sand is injected into the mo(u)ld top half dynamic model and the mo(u)ld top half cover half (131) and institute by the sand mouth of penetrating of the hull shape mould (130)
State in the accommodating cavity between mo(u)ld bottom half dynamic model and the mo(u)ld bottom half cover half (132), manufacture and described cover layer of sand (140)；
The sand mouth of penetrating is at least one.
4. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 3, its feature exist
In being additionally provided with exhaust duct on the hull shape mould (130), one end of the exhaust duct connects with the accommodating cavity, the other end
Connected with external environment, the exhaust duct is arranged on the opening position that precoated sand is not easy to reach.
5. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 3, its feature exist
In the heater includes electric heater unit；
The temperature of the mo(u)ld top half dynamic model is higher than the temperature of the mo(u)ld top half cover half (131), and the temperature of the mo(u)ld bottom half dynamic model is higher than described
The temperature of mo(u)ld bottom half cover half (132).
6. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 1, its feature exist
In, the proportional outline more than the casting in inner chamber of the hull shape mould (130), proportionality coefficient 2.0-2.3%.
7. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 1, its feature exist
In the running gate system includes cast gate (110) and ingate (10), and the ingate (10) is close to the hull shape mould (130)
Molding cavity set；The ingate (10) is at least one；
The cast gate (110) is connected with the molding cavity by least one ingate (10).
8. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 7, its feature exist
In the connecting portion between the ingate (10) and the molding cavity of the hull shape mould (130) is provided with into nozzles, described
The length for entering nozzles is 4-6mm.
9. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 7, its feature exist
In, the running gate system also includes rising head, and the rising head is arranged at the heavy wall thermal center of the casting, the rising head with it is described into
Type inner chamber connects.
10. heat resisting cast steel turbocharger turbine housing iron die sand casting process according to claim 9, its feature exist
In the number of packages that the quantity of the ingate (10) is molded with the device for sand coated iron mould mould single matches, and each ingate
(10) rising head close to each casting corresponding position is set.
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| CN114523075A (en) * | 2022-01-21 | 2022-05-24 | 威斯卡特工业（中国）有限公司 | Process for manufacturing heat-resistant steel of variable-section turbocharger shell |
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Application publication date: 20180227 |