CN108971430A - A kind of crankshaft iron die sand casting process and its swage device - Google Patents

A kind of crankshaft iron die sand casting process and its swage device Download PDF

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Publication number
CN108971430A
CN108971430A CN201810941245.2A CN201810941245A CN108971430A CN 108971430 A CN108971430 A CN 108971430A CN 201810941245 A CN201810941245 A CN 201810941245A CN 108971430 A CN108971430 A CN 108971430A
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CN
China
Prior art keywords
swage
iron
crankshaft
casting
cope
Prior art date
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
CN201810941245.2A
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Chinese (zh)
Inventor
李贵来
吉伟龙
吴昊
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Xiangfen Fukang Foundry Co Ltd
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Xiangfen Fukang Foundry Co Ltd
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Application filed by Xiangfen Fukang Foundry Co Ltd filed Critical Xiangfen Fukang Foundry Co Ltd
Priority to CN201810941245.2A priority Critical patent/CN108971430A/en
Publication of CN108971430A publication Critical patent/CN108971430A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/06Permanent moulds for shaped castings
    • B22C9/068Semi-permanent moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/08Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon

Abstract

Present invention relates particularly to a kind of crankshaft iron die sand casting process and its swage devices, belong to casting field, the technical problem to be solved is that providing one kind to exclude casting mold type intracavity gas in time, completes the casting of 150 kilograms or more of crankshaft product, and improve the iron die sand casting process and swage device of its yield rate, the technical solution of use are as follows: a kind of crankshaft iron die sand casting process, comprising steps of master mold makes, swage production, device for sand coated iron mould, mould assembling, cast iron melting and casting are unpacked;A kind of crankshaft swage device, comprising: cope, drag box, case card, two sprue gates, several ventholes, casting mold type chamber, protruding block close snap ring and operating stick;The solidification that the present invention can accelerate iron liquid is cooling, crystallization of refinement tissue;The intracavitary gas of casting mold type can be discharged in venthole of the present invention in time, when producing 150 kilograms or more of crankshaft, avoid that stomata occurs in crankshaft product and molten iron casting is insufficient happens.

Description

A kind of crankshaft iron die sand casting process and its swage device
Technical field
The present invention relates to casting fields, and in particular to a kind of crankshaft iron die sand casting process and its swage device.
Background technique
Casting is one of the main method of manufactured parts blank, and forming method, which mainly heats ironware, to be melted, and makes it As the iron liquid with mobility, it is intracavitary to be then cast to the effigurate casting mold type of tool, fills type under gravity Chamber, cooling are simultaneously frozen into casting or part.Crankshaft is one of key components and parts of engine, and performance quality, which directly affects, starts The service performance of machine and service life.Currently, automobile-used, the crank axle for vessel of the production of domestic casting producer generally use traditional handicraft, such as Tide mould sand technique, the crankshaft that this method produces cause tissue crystals coarse since the setting rate of iron liquid is slow, high rejection rate, Product yield is low, and machining allowance is big, and production efficiency is low.
The heating conduction of device for sand coated iron mould technology utilization swage, the solidification that can accelerate iron liquid is cooling, and crystallization of refinement tissue mentions The compactness of height tissue, meets product material requirement, and rough casting machining allowance can be made to reduce, and dimensional accuracy is high, reduces useless Product rate improves production efficiency.But device for sand coated iron mould technique is mainly used for weight in 150 kilograms or less automobile engines songs at present The production of axis.Crankshaft product for weight up to 150 kilograms or more still uses tide mould sand technique to produce, and weight is reached When 150 kilograms or more of crankshaft product is produced using device for sand coated iron mould technique, when pouring into molten iron to type chamber, type is intracavitary existing big Amount gas cannot exclude in time, cause crankshaft product to generate stomata, and have molten iron casting is insufficient to happen.
Summary of the invention
The invention overcomes the deficiencies of the prior art, and provides one kind can exclude casting mold type intracavity gas in time, The casting of 150 kilograms or more of crankshaft product is completed, and improves the iron die sand casting process and its swage device of its yield rate.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: a kind of crankshaft iron die sand casting process, The following steps are included:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1340~1480 DEG C;It pours It is poured simultaneously when note to two sprue gates;
6) it unpacks after unpacking: greater than being equal to 90 minutes.
The material of the molten iron is spheroidal graphite cast-iron.
Every case duration of pouring is 90~150 seconds.
The influence for touching angle is acted according to crankshaft, designs and produces a set of core box, and cooperation, which is covered placer iron and moulded, makees crankshaft product.
Device for sand coated iron mould process is the committed step entirely cast, directly affects the height of yield rate, will during covering sand Swage and master mold are heated to 260 DEG C, and precoated sand cannot be fully cured when temperature is too low, and precoated sand is in flow process when the temperature is excessively high In just it is cured.
Penetrating sand is the cavity for utilizing low-pressure compressed air (0.6MPa) to be blown into fluidised form precoated sand between master mold and swage, is penetrated The sand time is generally 6~10 seconds, and precoated sand generally uses sand in coating phenolic resin.
In casting process, because molten steel solidification is fast, field trash is difficult to float, and filtering is placed generally in running gate system Piece completes pushing off the slag processing.
Spheroidal graphite cast-iron is a kind of high strength cast iron material, and comprehensive performance has been successfully used in casting stress close to steel Complexity, the high components of intensity, toughness, wearability.Spheroidal graphite cast-iron is globular graphite obtained by nodularization and inoculation, is had The plasticity, toughness and intensity for improving spheroidal graphite cast-iron of effect.
Include using the ductile iron crankshaft product chemistry sexual element that such device for sand coated iron mould technique produces: C:3.6~ 3.8%, Si:2.1~2.5%, Cu:0.4~0.7%, Mn:0.3-0.7% and other a small amount of compositions, remaining is Fe.
A kind of swage device, comprising: cope, drag box, case card, two sprue gates, several ventholes, casting mold type chamber, Protruding block closes snap ring and operating stick;
Cope is the groove-like structure that Open Side Down, drives that there are two sprue gate and several ventholes at the top of the cope, described Cope two sides are each provided with protruding block A;Be provided with drag box below the cope, the drag box be opening upwards and with The corresponding groove-like structure of cope opening shape, and casting mold type chamber is formed inside cope and drag box, the cope is convex Drag box two sides below bittiness A are correspondingly arranged on protruding block B, on the protruding block A and protruding block B of swage device two sides It is each provided with a closing snap ring, the inside diameter of the closing snap ring laterally closes the snap ring other side gradually from closing snap ring one Become larger, closing snap ring is used for clamping cope and drag box, and the cope is provided with several to card with drag box junction The case card of tight sand case.
The protruding block A and protruding block B is cylinder.
Operating stick is fixed on the closing snap ring, the operating stick is for swinging closing snap ring.
The venthole is difficult to exhaust position and is connected to casting mold type chamber upper lobes point and casting mold type chamber.
The quantity of the case card is 3~5 pairs.
The height of the venthole 5 is higher than 5~10 centimetres of height of the sprue gate 4.
The case card is firmly fixed together cope and drag box, prevent from occurring in molten iron casting cope and There is relative motion in drag box, to guarantee the dimensionally stable of crankshaft product and accurate.
The present invention has the advantages that compared with prior art.
One, the present invention produces ductile iron crankshaft using device for sand coated iron mould technique, and the solidification which can accelerate iron liquid is cold But, crystallization of refinement tissue improves the compactness of tissue, meets product material requirement, and rough casting machining allowance can be made to reduce, Dimensional accuracy is improved, rejection rate is reduced, improves production efficiency.
Two, venthole is arranged on the top of cope in the present invention, and in casting, casting mold type chamber can be discharged in venthole in time Interior gas avoids crankshaft product from the situation hair of stomata and molten iron casting deficiency occur when producing 150 kilograms or more of crankshaft It is raw, yield rate is improved, and extend the range of device for sand coated iron mould technique application, is more advantageous to and plays the excellent of device for sand coated iron mould technique Gesture.
Three, two sprue gates of present invention setting, accelerate the duration of pouring, molten iron are made uniformly to pour into crankshaft mould in a short time Type is more advantageous to the uniformity of control crankshaft tissue.
Four, the present invention extends that the product service life period is long, and the cam clamp structures are simple using eccentric closing snap ring, Using eccentric wheel eccentric center principle, certain pressure angle is rotated to by cam clamp, realizes and sandbox upper and lower mould is quickly stepped up And release, the pressing force of clamp is increased, meets the requirement that sandbox closure is tight, unlatching is fast, and the cam clamp is easy to change, Working service is convenient, practical.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of swage of the present invention.
Fig. 2 is the top view of swage of the present invention.
Fig. 3 is the side view of swage of the present invention.
In figure: 1 is cope, and 2 be drag box, and 3 be case card, and 4 be sprue gate, and 5 be venthole, and 6 be casting mold type chamber, and 7 are Protruding block, 8 be closing snap ring, and 9 be operating stick.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
A kind of crankshaft iron die sand casting process, comprising the following steps:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1340 DEG C;When casting to Two sprue gates are poured simultaneously;
6) it unpacks: unpacking after 90 minutes.
The material of the molten iron is spheroidal graphite cast-iron.
Every case duration of pouring is 90 seconds.
Embodiment 2
A kind of crankshaft iron die sand casting process, comprising the following steps:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1480 DEG C;When casting to Two sprue gates are poured simultaneously;
6) it unpacks: unpacking after 100 minutes.
The material of the molten iron is spheroidal graphite cast-iron.
Every case duration of pouring is 150 seconds.
Embodiment 3
A kind of crankshaft iron die sand casting process, comprising the following steps:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1380 DEG C;When casting to Two sprue gates are poured simultaneously;
6) it unpacks: unpacking after 95 minutes.
The material of the molten iron is spheroidal graphite cast-iron.
Every case duration of pouring is 100 seconds.
Embodiment 4
A kind of crankshaft iron die sand casting process, comprising the following steps:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1420 DEG C;When casting to Two sprue gates are poured simultaneously;
6) it unpacks: unpacking after 95 minutes.
The material of the molten iron is spheroidal graphite cast-iron.
Every case duration of pouring is 120 seconds.
As shown in Figure 1-3, a kind of swage device, comprising: cope 1, drag box 2, case card 3, two sprue gates 4 are several Venthole 5, casting mold type chamber 6, protruding block 7 close snap ring 8 and operating stick 9;
Cope 1 is the groove-like structure that Open Side Down, is driveed at the top of the cope 1 there are two sprue gate 4 and several ventholes 5, 1 two sides of cope are each provided with protruding block A;Drag box 2 is provided with below the cope 1, the drag box 2 is opening Groove-like structure upward and corresponding with 1 opening shape of cope, and casting mold type chamber 6 is formed inside cope 1 and drag box 2, Drag box two sides below the 1 protruding block A of cope are correspondingly arranged on protruding block B, the protrusion of swage device two sides Be each provided with a closing snap ring 8 on block A and protruding block B, the inside diameter of the closing snap ring 8 from closing 8 one side of snap ring to Closing 8 other side of snap ring becomes larger, and closing snap ring 8 is used for clamping cope 1 and drag box 2, the cope 1 and drag box Junction is provided with several case cards 3 to clamping sandbox.
The protruding block A and protruding block B is cylinder.
Operating stick 9 is fixed on the closing snap ring 8, the operating stick 9 is for swinging closing snap ring 8.
The venthole 5 is difficult to exhaust position and is connected to 6 upper lobes point of casting mold type chamber and casting mold type chamber 6.
The quantity of the case card is 3~5 pairs.
The height of the venthole 5 is higher than 10 centimetres of height of the sprue gate 4.
Above embodiment is merely exemplary to illustrate the principle of the present invention and its effect, and is not intended to limit the present invention.For Person skilled in the art all without departing from the spirit and scope of the present invention, modifies above-described embodiment or is improved.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by tool usually intellectual in all act technical fields At all equivalent modifications or change, should be covered by the claims of the present invention.

Claims (9)

1. a kind of crankshaft iron die sand casting process, which comprises the following steps:
1) master mold makes: design is a set of and the consistent model of crankshaft shape is as master mold;
2) swage makes: the swage that production is matched with master mold, and there are two sprue gates for swage setting, between swage and the cavity of master mold Gap is 10~12mm;
3) device for sand coated iron mould: then precoated sand is incident upon between master mold and swage by heating master mold and swage by penetrating sand machine sand-spraying hole Cavity, solidification complete 120 seconds after molding;
4) mould assembling: the swage for completing to cover sand is placed into filter screen, mould assembling clamps, and places to pouring platform;
5) cast iron melting and casting: cast iron melting temperature is 1580~1590 DEG C, and molten steel pouring temperature is 1340~1480 DEG C;It pours It is poured simultaneously when note to two sprue gates;
6) it unpacks after unpacking: greater than being equal to 90 minutes.
2. a kind of crankshaft iron die sand casting process according to claim 1, which is characterized in that the material of the molten iron is Spheroidal graphite cast-iron.
3. a kind of crankshaft iron die sand casting process according to claim 1, which is characterized in that every case duration of pouring is 90 ~150 seconds.
4. swage device described in a kind of claim 1, it is characterised in that: include: cope (1), drag box (2), case card (3), two sprue gates (4), several ventholes (5), casting mold type chamber (6), protruding block (7) close snap ring (8) and operating stick (9);
Cope (1) is the groove-like structure that Open Side Down, drives that there are two sprue gate (4) and if doing at the top of the cope (1) Stomata (5), cope (1) two sides are each provided with protruding block A;Drag box (2), institute are provided with below the cope (1) Drag box (2) are stated as opening upwards and groove-like structure corresponding with cope (1) opening shape, and cope (1) and lower sand Casting mold type chamber (6) are formed inside case (2), drag box (2) two sides below cope (1) the protruding block A are correspondingly arranged on A closing snap ring (8), the closing are each provided on protruding block B, the protruding block A and protruding block B of swage device two sides The inside diameter of snap ring (8) becomes larger from closing (8) one side of snap ring to enclosed card ring (8) other side, and closing snap ring (8) is used for Clamping cope (1) and drag box (2), the cope (1) and drag box (2) junction are provided with several to clamping sandbox Case card (3).
5. a kind of swage device according to claim 4, which is characterized in that the protruding block A and protruding block B is cylinder Shape.
6. a kind of swage device according to claim 4, which is characterized in that be fixed with operation on the closing snap ring (8) Bar (9), the operating stick (9) is for swinging closing snap ring (8).
7. a kind of swage device according to claim 4, which is characterized in that on the venthole (5) and casting mold type chamber (6) Portion's raised points and casting mold type chamber (6) are difficult to exhaust position connection.
8. a kind of swage device according to claim 4, which is characterized in that the quantity of the case card (3) is 3~5 pairs.
9. a kind of swage device according to claim 4, which is characterized in that the height of the venthole (5) is higher than described 5~10 centimetres of the height at sprue gate (4).
CN201810941245.2A 2018-08-17 2018-08-17 A kind of crankshaft iron die sand casting process and its swage device Pending CN108971430A (en)

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Application Number Priority Date Filing Date Title
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