CN108620533A - A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting - Google Patents

A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting Download PDF

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Publication number
CN108620533A
CN108620533A CN201810485742.6A CN201810485742A CN108620533A CN 108620533 A CN108620533 A CN 108620533A CN 201810485742 A CN201810485742 A CN 201810485742A CN 108620533 A CN108620533 A CN 108620533A
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CN
China
Prior art keywords
sand
moulding
core
template
medium
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810485742.6A
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Chinese (zh)
Inventor
严春妍
夏志单
胡锦婷
文波
张根元
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Hohai University Changzhou Campus
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Hohai University Changzhou Campus
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Publication date
Application filed by Hohai University Changzhou Campus filed Critical Hohai University Changzhou Campus
Priority to CN201810485742.6A priority Critical patent/CN108620533A/en
Publication of CN108620533A publication Critical patent/CN108620533A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • B22C9/103Multipart cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings

Abstract

The present invention provides a kind of three-cavity moulding techniques of medium-sized thin-wall frame class casting, include the following steps:Nowel moulding:Using drag box apperance plate moulding, placing needs pre-buried part running gate system, and drag box template is taken out after sand loading;The moulding of molding is distinguished from both sides using two pieces of templates;Top box moulding:Using cope apperance plate moulding;To the sandbox and sand core coating coating after moulding, lower core, mould assembling prepares to pour into a mould after pressing case and card case.The present invention utilizes the pinpoint apperance plate moulding of energy, reduce case-opening goods-taking depanning sampling technology after mould turnover number and moulding, simplify raising middle flask formative technology simultaneously, reduce the quantity of sand core, especially there is significantly more effect in large and medium-sized cast casting technique, is provided for large and medium-sized casting three-cavity moulding a kind of with reference to technique.

Description

A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting
Technical field
The present invention relates to sand casting fields, and in particular to arrives a kind of three-cavity moulding work of medium-sized thin-wall frame class casting Skill.
Background technology
Sand mold gravitational casting is to be compacted that sand mold and sand is made by using the different degree of packing using the molding sand of certain performance Core makes molten metal inject the casting method in casting mold to form casting mold, using gravity, wide, the with short production cycle, valence with applicability The advantages that lattice are cheap.For medium-sized complex thin-wall frame class casting, since casting contour structure is complicated, internal multi-cavity, boss, wall are thin And be mostly made of complex-curved, make it be difficult to be molded, and use sand mold gravitational casting one-pass molding.
For medium casting, sandbox size used is larger, while sandbox weight weight when moulding, and sometimes according to casting structure Feature need to use three-cavity moulding, traditional three-cavity moulding technique that need to carry out multiple mould turnover operation, case-opening goods-taking depanning is needed after moulding Then sample is poured into a mould.Since the operations such as mould turnover, unpacking need to use the mechanical such as overhead traveling crane completion of auxiliary, the increase of mould turnover number The defects of so that moulding is difficult, while casting can be caused to be deformed, crack, influence casting quality.
Invention content
It is an object of the invention to solve the deficiencies in the prior art, provide a kind of medium-sized thin-wall frame class casting three casees are made Type technique, solves the problems, such as to need in modeling process to need case-opening goods-taking to go out apperance after multiple mould turnover and moulding to make complex process, together When simplify raising middle flask formative technology.
To solve the above problems, the present invention provides a kind of three-cavity moulding technique of medium-sized thin-wall frame class casting, feature It is to include the following steps:
Step 1:Nowel moulding:For ease of the molding of projection section, the quantity of sand core used and simplified sand when reducing moulding Core shape, the plane constituted with casting boss and both sides through-bore axis are a die joint, die joint with lower part combination sand core, Its bottom core print and nowel apperance is constituted positioned at the part sprue of drag box, nowel apperance is fixed in template and constitutes lower sand Case template, plane is connected with running gate system ingate on the bottom core print;When moulding, drag box is placed on moulding On platform, drag box template is placed, while the part running gate system that placing need to be pre-buried, the part running gate system includes horizontal pours Road, sprue base, ingate and slag trap;It waits for that molding sand cures after sand loading, drag box is overturn 180 °, takes out drag box apperance Plate;
Step 2:Raising middle flask moulding:During bottom die joint above section framework, the big plectane plane in top and internal cores are constituted Case apperance;Under the premise of convenient for distinguishing molding from upper and lower both sides, in casting lower part framework and the big plectane plane transition face in top Part more than transition face is split by the interior circle with framework diameter, constitutes apperance and cheek upper mold under cheek The upper and lower apperance of cheek is separately fixed at the composition upper and lower template of cheek in two pieces of templates by sample;When moulding, by middle sand Case is placed on build platform, places template under cheek, is loaded proper volume molding sand, is closed template on cheek, wait for After molding sand solidification, the upper and lower template of cheek is taken out respectively from both sides, do not have to constitute casting mold using sand core at this time in order to rise Mould simplifies raising middle flask formative technology;
Step 3:Top box moulding:To form sand core top core print, the sprue positioned at cope part of core cavity And riser and riser head heat-preserving set constitute cope apperance, and cope apperance is fixed on composition cope template in template;It makes When type, cope is placed on build platform, places cope template, after molding sand solidification, takes out drag box template, Place riser head heat-preserving set;
Step 4:To the sandbox and sand core coating coating after moulding, core sequence is pressed:1#Sand core -2#Sand core -3#Sand core Lower core, mould assembling prepare cast after pressing case and card case.
Further, in step 4, the mould assembling and pressure case process, to ensure to be accurately positioned between three sandboxes, using fixed Dowel hole is arranged on sandbox, while case card device being arranged between sandbox for position pin assembly (abbreviation positioning pin).
Further, in the modeling process, drag box template, the upper and lower template of cheek, cope template is equal Positioning pin is set, and during sandbox mould assembling and card case, coordinates the dowel hole set by corresponding sandbox to use, realizes apperance Between be accurately positioned.
Compared with prior art, the advantageous effect of the invention reached is:The present invention uses the technique for simplifying raising middle flask moulding, The apperance for needing to be placed on moulding in cope is placed on cheek and unifies moulding, reduces influence of the mould shift to casting quality;It is logical The mode from both sides molding is crossed, does not use complicated sand core to form casting mold so as to molding, simplifies raising middle flask formative technology;Simultaneously Template used coordinates dowel hole on corresponding sandbox by the way that dowel device is arranged, and realizes being accurately positioned between apperance, Reduce mould turnover number simultaneously, and case-opening goods-taking goes out apperance after not needing moulding, the operations such as thick and heavy sandbox need to repeatedly be overturn by reducing Technique simplifies the modeling process of large and medium-sized casting, saves time, manpower and materials, also improves productivity and safety coefficient.
Description of the drawings
Fig. 1 is the medium-sized aluminium alloy castings model schematic of the embodiment of the present invention;
Fig. 2 is die joint of embodiment of the present invention selection schematic diagram;
Fig. 3 is sand core and internal arbor schematic diagram in the embodiment of the present invention;
Fig. 4 is that sand core places effect diagram in the embodiment of the present invention;
Fig. 5 is the upper and lower template schematic diagram of cheek in the embodiment of the present invention;
Fig. 6 is to simplify raising middle flask modeling process schematic diagram in the embodiment of the present invention
Fig. 7 is three sandboxes and sand mold schematic diagram in the embodiment of the present invention;
Fig. 8 is lower core sequence and mould assembling schematic diagram in the embodiment of the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings, and following embodiment is only used for clearly illustrating the present invention Technical solution, and not intended to limit the protection scope of the present invention.
The casting example that the present invention uses is medium-sized complex thin-wall aluminium alloy castings, material ZL114A, as shown in Figure 1, Its overall size is 1150mm × 1375mm × 440mm, main wall thickness about 30mm.Cope size be 1570mm × 1520mm × 165mm, cheek size are 1570mm × 1520mm × 192mm, and drag box size is 1570mm × 1520mm × 430mm.
A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting of the present invention, includes the following steps:
Step 1:Nowel moulding:The plane constituted with casting boss and both sides through-bore axis is a die joint, die joint Nowel apperance is constituted with lower part combination sand core, its bottom core print and part sprue positioned at drag box, nowel apperance is consolidated It is scheduled on composition drag box template in template, plane is connected with running gate system ingate on the bottom core print;When moulding, Drag box is placed on build platform, drag box template is placed, while the part running gate system that placing need to be pre-buried, the portion Point running gate system includes cross gate, sprue base, ingate and slag trap;It waits for that molding sand cures after sand loading, drag box is overturn 180 °, take out drag box template;
Parting Surface Design scheme used in the present invention as shown in Fig. 2, examined by analyzing casting structure for ease of molding first Worry places the big plane of cast top upward, at this point, to ensure top quality, should suitably increase its reserved allowance.Due to There are two larger sections up and down for casting, wherein also there are one small bores for folder, therefore it is more suitable using three-cavity moulding, for just In projection section molding, a die joint, another die joint setting are set at the plane that boss and both sides through-bore axis are constituted In cast top.
Three pieces of sand cores are set altogether in the present invention, as shown in figure 3, since sand core size is larger, inside is respectively provided with arbor to increase Add its intensity, to being used to form the sand core of inner cavity, one piece of hollow area of arbor Inner Constitution, when moulding inside filling coke or Furnace clinker to reduce sand core weight, while enhancing sand core gas permeability.It is as shown in Figure 4 that effect is arranged in sandbox.
Step 2:Raising middle flask moulding:During bottom die joint above section framework, the big plectane plane in top and internal cores are constituted Case apperance;Under the premise of convenient for distinguishing molding from upper and lower both sides, in casting lower part framework and the big plectane plane transition face in top Part more than transition face is split by the interior circle with framework diameter, constitutes apperance and cheek upper mold under cheek The upper and lower apperance of cheek is separately fixed at the composition upper and lower template of cheek in two pieces of templates by sample;When moulding, by middle sand Case is placed on build platform, places template under cheek, is loaded proper volume molding sand, is closed template on cheek, wait for After molding sand solidification, the upper and lower template of cheek is taken out respectively from both sides, do not have to constitute casting mold using sand core at this time in order to rise Mould simplifies raising middle flask formative technology;
Two pieces of templates are arranged in raising middle flask of the present invention, as shown in figure 5, convenient for from both sides after splitting apperance by diagramatic way Mould, while when closing cheek cope plate after sand loading, extra molding sand will not be remained between two templates.As shown in Figure 5, in two templates It is respectively provided with positioning pin, coordinates dowel hole on cheek, the upper and lower template of cheek all fixed by dowel hole on cheek Position, apperance to realize being accurately positioned between apperance, is taken out, need not again unpack to take out apperance after mould assembling before mould assembling. Positioning pin length in upper and lower two template of cheek only porose half.As shown in fig. 6, not adopted in cheek modeling process Casting mold is formed so that molding simplifies raising middle flask formative technology to reduce required sand core quantity in modeling process with sand core.
Step 3:Top box moulding:To form sand core top core print, the sprue positioned at cope part of core cavity And riser head heat-preserving set constitutes cope apperance, and cope apperance is fixed on composition cope template in template;It, will when moulding Cope is placed on build platform, places cope template, after molding sand solidification, takes out drag box template, placement emits Mouth muff;
Three sandbox of upper, middle and lower designed by the present invention takes out corresponding apperance as shown in fig. 7, pressing the modeling process After plate, sand mold as shown in the figure is left.
Step 4:To the sandbox and sand core coating coating after moulding, core sequence is pressed:1#Sand core -2#Sand core -3#Sand core Lower core, mould assembling prepare cast after pressing case and card case.
In the embodiment of the present invention, the molding sand is alkaline phenolic resin self-hardening sand, including 50~60% fresh sands, 40~50% Old sand, 1.6~1.8% phenolic resin, 30% curing agent (accounting for resin), the core sand are alkaline phenolic resin self-hardening sand, including 30~40% fresh sands, 60~70% old sands, 1.8~2.5% resins, 30% curing agent (accounting for resin), the coating apply for alcohol radical Material, including 80% zirconium English powder, 0.5~1.5% sodium bentonite, 0.5~2.5% thermoplastic phenolic resin, 2.0~2.5% bumps Stick soil, 0.2~0.4% dispersant, ethanol in proper amount.
As shown in figure 8, by sequence in figure, it first will be by the drag box of wooden model sample moulding by lower core sequence in figure:1#Sand Core -2#Sand core -3#Core under sand core using two pieces of templates in Fig. 5 simplify the raising middle flask moulding of technique to raising middle flask, at this time will The good raising middle flask of moulding is assembled with nowel, the last suitable top box of fit on, placement sprue cup, weight, and three casees are completed after card case Moulding takes out wooden model sample at this point, need not unpack.
A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting provided by the present invention, needs when solving three-cavity moulding Case-opening goods-taking is needed to go out the problem of apperance and raising middle flask moulding complexity after multiple mould turnover, moulding, especially for large and medium-sized casting, letter The effect of change becomes apparent.Those skilled in the art are easy when using the method for the present invention according to listed process Highly efficient, simple, suitable technical process for casting and specification are formulated according to specific casting.
The above is only that the non-limiting embodiment of the present invention does not take off for those of ordinary skill in the art Under the premise of conceiving from the invention and do not make creative work, various modifications and improvements can be made, these all belong to In protection scope of the present invention.

Claims (9)

1. a kind of three-cavity moulding technique of medium-sized thin-wall frame class casting, characterized in that include the following steps:
Step 1:Nowel moulding:The plane constituted using casting boss and both sides through-bore axis is die joint, and die joint is with lower part Divide in conjunction with sand core, sand core bottom core print and positioned at the part sprue composition nowel apperance of drag box, nowel apperance is fixed on Drag box template is constituted in template, plane is connected with running gate system ingate on the bottom core print;When moulding, will under Sandbox is placed on build platform, places drag box template, while the part running gate system that placing need to be pre-buried, and type is waited for after sand loading Sand cures, and drag box is overturn 180 °, takes out drag box template;
Step 2:Raising middle flask moulding:Bottom die joint above section framework, the big plectane plane in top and internal cores constitute raising middle flask mould Sample;With the circle of framework diameter by part more than transition face in casting lower part framework and the big plectane plane transition face in top It is split, constitutes under cheek apperance on apperance and cheek, the upper and lower apperance of cheek is separately fixed at two pieces of templates The upper and lower template of upper composition cheek;When moulding, cheek is placed on build platform, places template under cheek, dress Proper volume molding sand is filled out, template on cheek is closed, after molding sand solidification, takes out the upper and lower apperance of cheek respectively from both sides Plate;
Step 3:Top box moulding:To formed core cavity sand core top core print, positioned at cope part sprue, emit Mouth and riser head heat-preserving set constitute cope apperance, and cope apperance is fixed on composition cope template in template;When moulding, Cope is placed on build platform, cope template is placed, after molding sand solidification, drag box template is taken out, places Riser head heat-preserving set;
Step 4:To the sandbox and sand core coating coating after moulding, core sequence is pressed:1#Sand core -2#Sand core -3#Core under sand core, Prepare cast after mould assembling, pressure case and card case.
2. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 1, which is characterized in that sandbox mould assembling and During card case, positioned two-by-two using dowel device between three sandbox of upper, middle and lower.
3. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 1, which is characterized in that above and below cope The dowel hole cooperation being arranged on the positioning pin and cope being arranged in template;The positioning being arranged in template above and below cheek The dowel hole being arranged on pin and cheek coordinates;It is arranged on the positioning pin and drag box being arranged in template above and below drag box Dowel hole coordinates.
4. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 1, which is characterized in that pour the part Injection system includes cross gate, sprue base, ingate and slag trap.
5. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 1, which is characterized in that modeling process In, three pieces of sand cores are set, has included sand core part in template, after template is taken out in molding, has had on sand embryo and keep for sand core Vacancy is equipped with core bedding frame when designing sand core, sand core is placed according to the position of core bedding frame when placing sand core, to be carried out to sand core It positions and fixed.
6. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 5, which is characterized in that at described three pieces Sand core internal is all arranged to add to the arbor of sand core strength.
7. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 6, which is characterized in that in core when moulding Coke or furnace clinker are inserted in the hollow area of bone Inner Constitution.
8. the three-cavity moulding technique of the medium-sized thin-wall frame class casting according to claim 1~7 any claim, feature It is, the molding sand for filling is alkaline phenolic resin self-hardening sand.
9. the three-cavity moulding technique of medium-sized thin-wall frame class casting according to claim 8, which is characterized in that the alkalinity phenol Urea formaldehyde self-hardening sand (accounts for tree including 50~60% fresh sands, 40~50% old sands, 1.6~1.8% phenolic resin, 30% curing agent Fat), the core sand is alkaline phenolic resin self-hardening sand, including 30~40% fresh sands, 60~70% old sands, 1.8~2.5% trees Fat, 30% curing agent (accounting for resin), the coating be alcohol-base paint, including 80% zirconium English powder, 0.5~1.5% sodium bentonite, 0.5~2.5% thermoplastic phenolic resin, 2.0~2.5% attapulgites, 0.2~0.4% dispersant, ethanol in proper amount.
CN201810485742.6A 2018-05-21 2018-05-21 A kind of three-cavity moulding technique of medium-sized thin-wall frame class casting Pending CN108620533A (en)

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Publication number Priority date Publication date Assignee Title
CN110216247A (en) * 2019-07-17 2019-09-10 晋江鹏发机械有限公司 Casting clay-bonded sand wet process formative technology

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Application publication date: 20181009