CN109482819A - The casting method of Al-alloy casing - Google Patents
The casting method of Al-alloy casing Download PDFInfo
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- CN109482819A CN109482819A CN201811369419.9A CN201811369419A CN109482819A CN 109482819 A CN109482819 A CN 109482819A CN 201811369419 A CN201811369419 A CN 201811369419A CN 109482819 A CN109482819 A CN 109482819A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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Abstract
The invention belongs to casting fields, are related to a kind of casting method of Al-alloy casing, the casting technique including 1) designing part to be cast according to the design feature of part to be cast, and final selection equipment is combined to design casting mould；2) casting mould is analyzed using AnyCasting simulation softward；3) optimize casting mould according to analog result；4) each oil circuit sand core of riser sand core and housing cavity is blown, all sand cores are bonded and are assembled, is put into baking kiln and keeps the temperature；5) melting and heat preservation furnace is added raw materials into, be powered fusing, and carries out refining degasification using rotary degassing machine；It 6) will combination sand core preheating；7) it into metal type dies under group merging the sand core that toasted integrally, is poured；8) casting head of casting is cut, and polishes and clears up hard edges and fash.The present invention provides it is a kind of casting is steadily poured, casting qualified rate is high and the casting method of the Al-alloy casing that can reduce intricate casting knockout.
Description
Technical field
The invention belongs to casting field, it is related to a kind of casting method of Al-alloy casing, more particularly to a kind of containing complicated
The casting method of the Al-alloy casing of inner cavity.
Background technique
In aero-engine lower-grade fuel, there is the shell part of many inner cavity oil circuit complexity, this kind of part has oil
Greatly, each oil circuit is overlapped mutually staggeredly the variation of road cross section, and thin oil circuit (Φ 3mm~Φ 6mm) is more, and different equal spies
Point.Inner cavity oil circuit is generally used for the liquid substance of output high pressure oil, fuel oil, lubricant etc, therefore, to the intensity and gas of part
Close property has higher requirement.
Since structure is complicated for such housing cavity, cast-internal thermal center is more and disperses, formed the sand core quantity of inner cavity compared with
More and location difficulty, therefore this most of shells use metal mold gravity casting.But this casting method produces this shells and deposits
In more deficiency.Firstly, this shells size in engine fuel accessory class part is larger, sent out by sunykatuib analysis
Existing, when the sprue that gravity-assist pouring is selected is longer, aluminium alloy is easily involved in air, so shells gas hole defect is extremely serious,
Casting qualification rate is low, and production cost is larger.Secondly, structure is complicated for such housing cavity, thermal center is more and disperses, when gravity-assist pouring
Subsidy dredging Feeding channel need to be set, this is resulted in, and casting part surplus is larger, and yield rate is extremely low.Third, due to sand core quantity
More, sand core location difficulty, traditional sand core localization method is difficult to realize tilted casting method, and more independent sand core is located in mould
It is easy knockout in tool type chamber, causes scab defect；Be easy to appear sand core fracture in casting process simultaneously or float etc.
Phenomenon, the defects of causing inner cavity of component wall thickness dimension overproof or even oil circuit break-through, and these defects some until that machine adds is complete
Afterwards, casing rigidity, air-tight test stage could find, seriously affect production planning and sequencing and product delivers node.
Summary of the invention
In order to solve the above technical problems in background technology, the present invention provides one kind to enable casting steady
Casting, casting qualified rate is high and can reduce the casting method of the Al-alloy casing of intricate casting knockout.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of casting method of Al-alloy casing, it is characterised in that: the casting method of the Al-alloy casing includes following
Step:
1) casting technique of part to be cast is designed according to the design feature of part to be cast, and is set in conjunction with final selection
Standby design casting mould；
2) AnyCasting simulation softward analytical procedure 1 is utilized) obtained casting mould is designed, obtain analog result；
3) according to analog result Optimization Steps 1 obtained by step 2)) casting mould；
4) each oil circuit sand core of riser sand core and housing cavity is blown according to casting mould after step 3) optimization, by all sand
Core bonding assembling, is put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, takes out stand-by；
5) add raw materials into melting and heat preservation furnace, be powered fusing, and carries out refining degasification using rotary degassing machine, it is static after to
With；
6) combination sand core obtained in step 4) is preheated to 280~320 DEG C；
7) raw material under group merging the sand core that toasted integrally into metal type dies, after the melting obtained using step 5)
It is poured；
8) casting head of casting is cut, and polishes and clears up hard edges and fash, obtains finished product.
Above-mentioned steps 1) specific implementation be:
1.1) according to design of part to be cast, parting position is designed, further according to die parting line draft, machined surface surplus 2mm；
1.2) according to the design feature of part to be cast, selecting casting, the biggish face setting of Feeding channel emits from top to bottom
Mouthful, the face setting for selecting casting more smooth when verting molten metal into cast gate；
1.3) according to casting process conceptual design mold, core design uses a multi-cavity mold, Double-side Heating；Metal type dies
Structure includes mould bases, other each half modules, sprue cup, casting ejection system and the sliding block slide that cooperate with mould bases etc., each half module
Open mold passes through sliding block slide and mould bases location fit acts；Master positioning is assembled under sand core after core on mold mould bases, other
It is positioned supplemented by core print.
Above-mentioned steps 3) specific implementation be:
3.1) according to step 2) sunykatuib analysis result judgment step 1) in casting mould with the presence or absence of volume gas phenomenon and/or
Shrinkage cavity defect；
3.2) volume gas phenomenon if it exists, then open up air discharge duct or setting venting plug in casting mould corresponding position；If depositing
In Shrinkage cavity defect, then further judge the area of Shrinkage cavity defective locations whether more than 1000mm2, if so, in sand
Blind riser is set among core or blind riser is set on casting mould half module；If it is not, then having by adjusting casting die technique
The position of Shrinkage cavity defect increases subsidy；
3.3) step 2) is repeated until casting mould zero defect generates.
Above-mentioned steps 4) specific implementation be:
4.1) sand core is preheated: all parting direction thickness is greater than with the sand core of 500mm, mold temperature control exists
280 DEG C~300 DEG C；Thickness is less than the sand core of 500mm, and mold preheating temperature is controlled at 220 DEG C~280 DEG C；
4.2) sand, 0.3~0.5MPa of shooting pressure, 5~8s of Blowing time are penetrated using core shooter；
4.3) sand core crust firm time is controlled in 5~8min according to sand core thickness size；After crust, moving template will be partly
Model Cavity surface is overturn to level, takes out sand core；
4.4) polishing cleaning sand core fash, bores gas vent with electric drill at each sand core head；
4.5) core print is positioned according to cooperation, sand core is mutually assembled to bonding, finally using plane on riser sand core as benchmark face,
The size of detection assembling sand core, and guarantee that assembling all gas vents of sand core are unobstructed；
4.6) assembling sand core is put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, taken out stand-by.
Above-mentioned steps 5) specific implementation be:
5.1) charge melted: melting furnace is set as furnace gas temperature control, and furnace gas temperature is set as 860 DEG C, power transmission fusing；
5.2) alloy refine: using purity 99.9999% argon gas carry out refinery by de-gassing, refinery gas pressure 0.3~
0.5MPa after degasification, spreads slagging agent on metal bath surface, and all oxidizing slags on liquid level are skimmed, and molten metal is static stand-by；
5.3) chemical component sample alloy mass inspection: is poured when aluminium alloy remaining in crucible is about original half
With mechanical property sample.
Above-mentioned steps 7) specific implementation be:
7.1) will be by, into metal type dies, checking whether riser sand core is concordant with mould bases top face, really under combination sand core
It is accurate to protect combination sand core master positioning cooperation；
7.2) mold: sand core molds afterwards in place, before molding, blows off the knockout in type chamber with compressed air；
7.3) die sinking checks: without scratch during the die sinking inspection combination attached positioning open mold of sand core, checking that combination sand core is
It is no intact, blow the knockout in a type chamber again with compressed air；
7.4) it scoops material casting: when detection temperature of aluminum liquid reaches 700 DEG C~730 DEG C, scooping material and import sprue cup, start to vert and pour
Note；
7.5) etc. to be solidified: after casting complete, bed die water flowing is cooling, waits to be solidified；
7.6) be opened pickup: after riser solidifies completely, successively casting is taken out in die sinking.
The invention has the advantages that
The present invention provides a kind of casting methods of Al-alloy casing, including being designed according to the design feature of part to be cast
The casting technique of part to be cast, and final selection equipment is combined to design casting mould, utilize AnyCasting simulation softward
The casting mould that analysis design obtains, obtains analog result, optimizes casting mould according to analog result, according to casting die after optimization
Tool blowing each oil circuit sand core of riser sand core and housing cavity, all sand cores are bonded and are assembled, 150 DEG C ± 10 DEG C of baking kiln is put into
Middle heat preservation 2h takes out for use, adds raw materials into melting and heat preservation furnace, and be powered fusing, and carries out refining degasification using rotary degassing machine,
It is stand-by after static；Obtained combination sand core is preheated to 280~320 DEG C；Into gold under group merging the sand core that toasted integrally
Genotype mold is poured using the raw material after obtained melting；Casting head of casting is cut, and is polished and is cleared up hard edges and drape over one's shoulders
Seam, obtains finished product.The casting method that this method provides produces 1 similar casting and only needs 8~12min, improves production efficiency,
And stable product quality.The casting produced using the method for the present invention, inner cavity dimensionally stable, and be arranged secretly using assembly of sand core space
Riser feeding disperses thermal center, fundamentally solves the problems, such as the internal porosity of intricate casting, improves Internal Quality of Cast.This hair
Bright in tilted casting, sand core positioning is firm, reduces the common knockout problem of intricate casting, reduces the scab of cast(ing) surface
Defect improves the visual quality of casting.Using method provided in the present invention, the Complex Aluminum Alloy core cavity size of casting is equal
Meet technical requirement on design, greatly improves the production efficiency of such casting, and the defects of shrinkage porosite and scab significantly reduces, and adds
Rejection rate is can be controlled within 20% after work.The present invention can solve that this shells gas hole defect, yield rate be low, sand core positioning is inaccurate
The problems such as, by tilt pouring technique, the feeding of sand core internal blind riser and whole group core core setter skill enable casting steady
Casting, forms ideal temperature field and carries out consecutive solidification.It is larger that this new method has obtained such casting qualified rate
It is promoted, it is ensured that such casting can ensure smoothly completing for research and production task.
Specific embodiment
The present invention provides a kind of casting method of complicated inner cavity Al-alloy casing, and step includes: conceptual design, simulation point
Analysis, scheme improvement, coremaking group core, melting refinement, mold prepare, lower core is poured and cutting and elimination, specifically, each step is detailed
It states as follows:
1) conceptual design: design elements blank drawing first, according to die parting line draft, machined surface surplus 2mm；Then zero is designed
The casting process scheme of part according to parts character selects that casting open riser and blind riser quantity and position is arranged into gate location
It sets, the position of riser cannot be set, using the Feeding channel of subsidy dredging riser and thermal center position, organize core side according still further to whole
Case splits sand core, designs location fit mode between sand core；Finally according to equipment is selected, in conjunction with casting process conceptual design
Mould structure, assembles under sand core that master positioning is fixed supplemented by other core prints and the cooperation of mold half module on the fixed portal frame of mold after core
Position, specifically includes the following steps:
1.1) blank G- Design: according to design of part, design divides mould position, further according to die parting line draft, machined surface surplus
2mm；
1.2) process planning: according to parts character, selecting casting, the biggish face setting of Feeding channel emits from top to bottom
Mouthful, the face setting for selecting casting more smooth when verting molten metal into cast gate；
1.3) mould structure designs: bonding apparatus structure and casting process conceptual design mold, and core design uses a mould
Multi-cavity, Double-side Heating；Design of Permanent Mould gantry mould frame, each half module open mold utilize gantry mould frame to position.Assemble core under sand core
After be located on mold gantry mould frame, positioned supplemented by other core prints.
2) sunykatuib analysis: after the completion of design, AnyCasting simulation softward analysis process scheme is utilized.
3) scheme is improved: Optimal improvements process program according to analog result.The defects of analysis mode result type.In the presence of
Volume gas phenomenon, air discharge duct or setting venting plug are opened up in mold corresponding position；(it is more than there are Shrinkage cavity defect area is larger
1000mm2) position, be arranged among sand core and blind riser or blind riser be set on mold half module.There are Shrinkage cavity areas
Lesser position increases the schemes such as subsidy and solves by adjusting casting process structure, specifically includes the following steps:
3.1) analysis mode result: selecting suitable criterion, analyzing defect size and position, determine defect type and
Producing reason；
3.2) improve process program: there are volume gas phenomenons, open up air discharge duct or setting venting plug in mold corresponding position；
It is larger (more than 1000mm that there are Shrinkage cavity defect areas2) position, blind riser or in mold half module is set among sand core
Upper setting blind riser.There are the lesser positions of Shrinkage cavity area to increase the schemes solutions such as subsidy by adjusting casting process structure
Certainly.
3.3) sunykatuib analysis again: according to above-mentioned steps 2) parameter reset, the improved process program of sunykatuib analysis.
4) coremaking group core: each oil circuit sand core of riser sand core and housing cavity is blown using the mold of design, takes out sand core
Polishing cleaning afterwards.The gas vent of Φ 3mm is beaten on all sand core heads with electric drill, brushes thermal insulation coatings in sand core blind riser, so
All sand cores are subjected to bonding assembling afterwards, guarantee that assembling all gas vents of sand core are unimpeded.After the completion, assembled sand core is put into
2h is kept the temperature in 150 DEG C ± 10 DEG C of baking kiln, is taken out for use, specifically includes the following steps:
4.1) mold preheats: sand core thickness is greater than 500mm, and mold temperature control is at 280 DEG C~300 DEG C, remaining small sand core,
Mold preheating temperature controls between 220 DEG C~280 DEG C；
4.2) sand core is blown: the control of core shooter shooting pressure controls between 5~8s in 0.3~0.5MPa, Blowing time；
4.3) crust hardening: according to sand core thickness size, by sand core crust firm time control between 5~8min.Knot
After shell, moving template overturns half module cavity surface to level, takes out sand core.
4.4) begin to rehearse stomata: polishing cleaning sand core fash bores the gas vent of Φ 3mm with electric drill at each sand core head,
Depth is grasped according to sand core length；
4.5) sand core combines: positioning core print according to cooperation, sand core is mutually assembled to bonding, finally with plane on riser sand core
For benchmark face, detection assembles the size of sand core, and guarantees that assembling all gas vents of sand core are unobstructed；
4.6) sand core toasts: assembling sand core being put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, is taken out stand-by.
5) melting refinement: adding raw materials into melting and heat preservation furnace, and be powered fusing, and carries out refining using rotary degassing machine and remove
Gas, static 15min is stand-by, specifically includes the following steps:
5.1) charge melted: melting furnace is set as furnace gas temperature control, and furnace gas temperature is set as 860 DEG C, power transmission fusing；
5.2) alloy refine: using purity 99.9999% argon gas carry out refinery by de-gassing, refinery gas pressure 0.3~
After 0.5MPa, degasification 15min, one layer of slagging agent is spread on metal bath surface, skims by all oxidizing slags on liquid level after 5min, gold
It is stand-by to belong to the static 10min of liquid；
5.3) chemical component sample alloy mass inspection: is poured when aluminium alloy remaining in crucible is about original half
With mechanical property sample.
6) mold prepares: mold is preheated to 280~320 DEG C, cleaning type chamber coating, first even application type chamber coating, then uses
Thermal insulation coatings brush sprue cup, clear up breather plug；
7) core is poured under: into metal type dies under group merging the sand core that toasted integrally, purging mold cavity, inspection group
Sand core is closed, if completely, casting machine reset starts to be poured, specifically includes the following steps:
7.1) will be by, into metal type dies, checking whether riser sand core is concordant with mould bases top face, really under combination sand core
It is accurate to protect combination sand core master positioning cooperation；
7.2) mold: sand core molds afterwards in place, before molding, blows off the knockout in type chamber with compressed air；
7.3) die sinking checks: without scratch during the die sinking inspection combination attached positioning open mold of sand core, checking that combination sand core is
It is no intact, blow the knockout in a type chamber again with compressed air；
7.4) it scoops material casting: when detection temperature of aluminum liquid reaches 700 DEG C~730 DEG C, scooping material and import sprue cup, start to vert and pour
Note, the tilt pouring time, speed of verting was according to slow sequence again fast after first slow according to casting size, generally 6~12s；
7.5) etc. to be solidified: after casting complete, bed die water flowing is cooling, waits setting time according to casting complexity, and one
As 2~5min；
7.6) be opened pickup: after riser solidifies completely, successively casting is taken out in die sinking.
8) cutting and elimination: cutting casting head of casting, and polish and clear up hard edges and fash.
Method provided by the present invention is described in detail below in conjunction with the casting of certain Complex Aluminum Alloy shell: the shell material
Matter is ZL101A, casting maximum outer dimension 200mm × 180mm × 160mm, and core cavity shares 6 oil circuits to differ in size,
And casting minimum wall thickness (MINI W.) 5mm, it is desirable that casting quality meets HB963-2005 " aluminium alloy castings specification ".
The specific casting step of the Complex Aluminum Alloy shell are as follows:
A conceptual design: design elements blank drawing first redesigns the casting process scheme of part, is finally set according to selection
It is standby, in conjunction with casting process conceptual design mould structure.The specific steps of which are as follows:
A) blank G- Design: according to design of part, which is designed as metal mold and verts four die sinkings, and then machined surface is put
2mm surplus, further according to die parting line draft；
B) process planning: the casting larger outlet face is selected to vert into gate location, open riser is set.Section is looked into
It sees casting structure, according to sand core structure in the biggish local Position Design blind riser of thermal center, does not design the position benefit of blind riser
With subsidy, the Feeding channel of riser and thermal center position is dredged.Sand core is finally split, designs and mutually organizes core positioning side between sand core
Method；
C) mould structure designs: mold design is four open forms, and combination sand core is located on the fixed portal frame of mold, each half module
Open mold passes through sliding rail sliding slot and gantry mould frame positions.Core mold is designed as a multi-cavity mold, and size sand core separately designs.
B sunykatuib analysis: after the completion of design, AnyCasting simulation softward analysis process scheme is utilized.
A) anyPRE pre-processing module is opened, each component Name is set, due to casting structure complexity, grid dividing 800
Ten thousand；
B) heat exchange coefficient is set, each module simultaneously sets initial temperature, and tilt angle is from 0~90 °；
C) it opens anySOLVER module and calculates analysis, after the completion, open anyPOST module and check sunykatuib analysis result.
C scheme is improved: Optimal improvements process program according to analog result.The defects of analysis mode result type is formulated
Improvement project.
A) analysis mode result: analyzing defect position and size determine defect type and Producing reason；
B) improve process program: after the casting sunykatuib analysis, there are shrinkage porosite tendency, shrinkage porosite faces for discovery suction flange disk position
Product about 1200mm2, therefore a blind riser is set at the top of ring flange.
C) sunykatuib analysis again: resetting, the improved process program of sunykatuib analysis according to the parameter of above-mentioned steps b),
It was found that ring flange position shrinkage porosite disappears.
D coremaking group core: blowing sand core, polishing clear up simultaneously sand core is mutually assemblied together, after having detected size, baking to
With, the specific steps of which are as follows:
A) mold preheats: sand core thickness is greater than 500mm, and mold temperature control is at 280 DEG C~300 DEG C, remaining small sand core, mould
Has preheating temperature control between 220 DEG C~280 DEG C；
B) sand core is blown: the control of core shooter shooting pressure is controlled in 0.3~0.5MPa, Blowing time in 8s or so；
C) crust hardening: according to sand core thickness size, by sand core crust firm time control between 5~8min.Crust
Afterwards, moving template overturns half module cavity surface to level, takes out sand core.
D) begin to rehearse stomata: polishing cleaning sand core fash bores the gas vent of Φ 3mm with electric drill at each sand core head, deep
Degree is grasped according to sand core length；
E) sand core combines: positioning core print according to cooperation, sand core is mutually assembled to bonding, is finally with plane on riser sand core
Datum level, the size of detection assembling sand core, and guarantee that assembling all gas vents of sand core are unobstructed；
F) sand core toasts: assembled sand core being put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, taken out before being poured stand-by
E melting refinement: adding raw materials into melting and heat preservation furnace, and be powered fusing, and after molten aluminum fusing, high-purity is passed through into molten aluminum
Argon gas is added refining agent and carries out rotation degasification.It the steps include:
A) charge melted: melting furnace is set as furnace gas temperature control, and furnace gas temperature is set as 860 DEG C, power transmission fusing；
B) alloy refines: carrying out refinery by de-gassing using the argon gas of purity 99.9999%, refinery gas pressure 0.4MPa is removed
After gas 15min, one layer of slagging agent is spread on metal bath surface, skims by all oxidizing slags on liquid level after 5min, molten metal is static
10min is stand-by；
C) alloy mass inspection: when aluminium alloy remaining in crucible is about original half be poured chemical component sample and
Mechanical property sample.
F mold prepares: installation metal type dies preheat simultaneously spary coating type chamber coating, install a mold on tilt pouring machine
Etc. to be cast.
A) mold preheats.Heating mould, hopper are heated to 300 DEG C, and each half module of mold is heated to 260 DEG C.
B) coating sprays.Finished product coating is mixed according to the ratio of water 1:4, spary coating type chamber, and bed die sprays two layers, and front and back is left
When right half module coating sprays, notice that thickness should successively successively decrease from top to bottom.
C) mold is installed.Mold is lifted on casting machine, detects mold temperature with infrared gun, insufficient requirement need to mend baking.
Core is poured under G: progressive die under assembling sand core being had, after molding, scoops material and tilt pouring.
A) will be by, into metal type dies, checking whether riser sand core is concordant with mould bases top face under combination sand core, it is ensured that
It is accurate to combine sand core master positioning cooperation；
B) mold: sand core molds afterwards in place, before molding, blows off the knockout in type chamber with compressed air；
C) die sinking checks: without scratch during the die sinking inspection combination attached positioning open mold of sand core, whether checking combination sand core
It is intact, blow the knockout in a type chamber again with compressed air；
D) it scoops material casting: when detection temperature of aluminum liquid reaches 720 ± 10 DEG C, scooping material and import sprue cup, start tilt pouring, incline
Turning the duration of pouring is 12s, and speed of verting is according to slow sequence again fast after first slow；
E) etc. to be solidified: after casting complete, bed die water flowing is cooling, waits setting time 3min；
F) be opened pickup: after riser solidifies completely, successively casting is taken out in die sinking.
H cutting and elimination: cutting casting head of casting, then cleared up the fash of cast(ing) surface, burr etc. with cleaning milling tools
Completely.
Claims (6)
1. a kind of casting method of Al-alloy casing, it is characterised in that: the casting method of the Al-alloy casing includes following step
It is rapid:
1) casting technique of part to be cast is designed according to the design feature of part to be cast, and is set in conjunction with final selection equipment
Count casting mould；
2) AnyCasting simulation softward analytical procedure 1 is utilized) obtained casting mould is designed, obtain analog result；
3) according to analog result Optimization Steps 1 obtained by step 2)) casting mould；
4) each oil circuit sand core of riser sand core and housing cavity is blown according to casting mould after step 3) optimization, all sand cores is glued
Assembling is connect, is put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, is taken out stand-by；
5) melting and heat preservation furnace is added raw materials into, be powered fusing, and carries out refining degasification using rotary degassing machine, stand-by after static；
6) combination sand core obtained in step 4) is preheated to 280~320 DEG C；
7) into metal type dies under group merging the sand core that toasted integrally, the raw material after the melting obtained using step 5) is carried out
Casting；
8) casting head of casting is cut, and polishes and clears up hard edges and fash, obtains finished product.
2. the casting method of Al-alloy casing according to claim 1, it is characterised in that: the specific implementation of the step 1)
Mode is:
1.1) according to design of part to be cast, parting position is designed, further according to die parting line draft, machined surface surplus 2mm；
1.2) according to the design feature of part to be cast, selecting casting, riser, choosing is arranged in the biggish face of Feeding channel from top to bottom
Select casting more smooth face setting when verting molten metal into cast gate；
1.3) according to casting process conceptual design mold, core design uses a multi-cavity mold, Double-side Heating；Metal pattern die lamps structure
Including mould bases, other each half modules, sprue cup, casting ejection system and sliding block slide with mould bases cooperation, each half module open mold
Acted by sliding block slide and mould bases location fit；On mold mould bases, other core prints are for master positioning after core under assembling sand core
Auxiliary positioning.
3. the casting method of Al-alloy casing according to claim 2, it is characterised in that: the specific implementation of the step 3)
Mode is:
3.1) according to step 2) sunykatuib analysis result judgment step 1) in casting mould whether there is volume gas phenomenon and/or shrinkage porosite
Shrinkage cavity defect；
3.2) volume gas phenomenon if it exists, then open up air discharge duct or setting venting plug in casting mould corresponding position；It contracts if it exists
Whether loose shrinkage cavity defect then further judges the area of Shrinkage cavity defective locations more than 1000mm2, if so, in sand core
Between be arranged and blind riser or blind riser be set on casting mould half module；If it is not, then having shrinkage porosite by adjusting casting die technique
The position of shrinkage cavity defect increases subsidy；
3.3) step 2) is repeated until casting mould zero defect generates.
4. the casting method of Al-alloy casing according to claim 3, it is characterised in that: the specific implementation of the step 4)
Mode is:
4.1) sand core is preheated: all parting direction thickness is greater than with the sand core of 500mm, mold temperature is controlled 280
DEG C~300 DEG C；Thickness is less than the sand core of 500mm, and mold preheating temperature is controlled at 220 DEG C~280 DEG C；
4.2) sand, 0.3~0.5MPa of shooting pressure, 5~8s of Blowing time are penetrated using core shooter；
4.3) sand core crust firm time is controlled in 5~8min according to sand core thickness size；After crust, moving template is by half model
Cavity surface is overturn to level, takes out sand core；
4.4) polishing cleaning sand core fash, bores gas vent with electric drill at each sand core head；
4.5) core print is positioned according to cooperation, sand core is mutually assembled to bonding, finally using plane on riser sand core as benchmark face, detection
The size of sand core is assembled, and guarantees that assembling all gas vents of sand core are unobstructed；
4.6) assembling sand core is put into 150 DEG C ± 10 DEG C of baking kiln and keeps the temperature 2h, taken out stand-by.
5. the casting method of Al-alloy casing according to claim 4, it is characterised in that: the specific implementation of the step 5)
Mode is:
5.1) charge melted: melting furnace is set as furnace gas temperature control, and furnace gas temperature is set as 860 DEG C, power transmission fusing；
5.2) alloy refine: using purity 99.9999% argon gas carry out refinery by de-gassing, refinery gas 0.3~0.5MPa of pressure,
After degasification, slagging agent is spread on metal bath surface, all oxidizing slags on liquid level are skimmed, and molten metal is static stand-by；
5.3) chemical component sample and power alloy mass inspection: are poured when aluminium alloy remaining in crucible is about original half
Learn performance sample.
6. the casting method of Al-alloy casing according to claim 5, it is characterised in that: the specific implementation of the step 7)
Mode is:
7.1) will be by, into metal type dies, checking whether riser sand core is concordant with mould bases top face, it is ensured that group under combination sand core
It is accurate to close sand core master positioning cooperation；
7.2) mold: sand core molds afterwards in place, before molding, blows off the knockout in type chamber with compressed air；
7.3) die sinking checks: without scratch during the die sinking inspection combination attached positioning open mold of sand core, checking whether combination sand core is complete
It is good, blow the knockout in a type chamber again with compressed air；
7.4) it scoops material casting: when detection temperature of aluminum liquid reaches 700 DEG C~730 DEG C, scooping material and import sprue cup, start tilt pouring；
7.5) etc. to be solidified: after casting complete, bed die water flowing is cooling, waits to be solidified；
7.6) be opened pickup: after riser solidifies completely, successively casting is taken out in die sinking.
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| CN111168044A (en) * | 2020-01-19 | 2020-05-19 | 四川省犍为恒益铝业有限公司 | Machining method for oil pipe shell after casting forming |
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