CN111036850A - Casting process design of frame-shaped structure cast steel node for engineering building - Google Patents

Casting process design of frame-shaped structure cast steel node for engineering building Download PDF

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Publication number
CN111036850A
CN111036850A CN201911254737.5A CN201911254737A CN111036850A CN 111036850 A CN111036850 A CN 111036850A CN 201911254737 A CN201911254737 A CN 201911254737A CN 111036850 A CN111036850 A CN 111036850A
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Prior art keywords
riser
casting
plate
main
thickness
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Inventor
陈祖华
何氢玲
江小山
李解华
王亚成
江涛
熊火顺
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CRRC Yangtze Tongling Co Ltd
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CRRC Yangtze Tongling Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • 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
    • 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
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould

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  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention discloses a casting process design of a frame-shaped structure cast steel node for engineering construction, which combines the structural characteristics of a product, carries out process analysis, identifies casting defects easy to generate, adopts proper technological measures such as a pouring system, a riser, a chill and the like, has obvious effect of improving the forming quality of a frame-shaped thin-wall structure casting by designing the pouring system with high flow rate, low flow rate and layer-by-layer introduction, and is beneficial to preventing the casting from deforming and improving the riser feeding capability. When the casting process of the frame-shaped thin-wall structure casting is designed, the deformation trend is correctly pre-judged, the sand reducing holes are reasonably designed to reduce the shrinkage resistance, and the anti-deformation amount is properly set to control the size precision of the casting.

Description

Casting process design of frame-shaped structure cast steel node for engineering building
Technical Field
The invention relates to a casting process design of a frame-shaped structure cast steel node for engineering construction.
Background
The frame-shaped structure cast steel node is a part which needs to bear alternating loads such as pressure, vibration, distortion and the like, and although the structure is not complex, the technical and quality safety requirements are high. The key wall thickness is 14 +/-1 mm, the main wall thickness is 40mm as shown in figure 1, the perpendicularity is 0.2mm, the wall thickness is required to be uniform, the structure is compact, the material is G20Mn5, 24 basic body tensile samples are required to be prepared in all connected heat joint areas and key wall thickness areas of a product frame body as shown in figure 2, performance detection is carried out, and the detection result is required to meet the relevant requirements of G20Mn5 steel types. The difficulties in producing the product are: firstly, how to ensure compact structure of each part of the frame body; secondly, how to prevent the frame body from deforming and ensure that all parts are stressed evenly in the product operation process.
Disclosure of Invention
The invention aims to provide a casting process design of a frame-shaped structure cast steel node for engineering construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a casting process design of a frame-shaped structure cast steel node for engineering construction comprises the following steps: the hot-spot casting device comprises a top plate waist circle heat-insulation blind riser, a main plate open-top riser and a side plate heat-insulation blind riser, wherein the lower part of the riser is provided with a riser patch to ensure that the hot spot of a casting is in the riser feeding range, and the size of the riser is calculated according to the size of the patch part of the casting;
side plate heat preservation blind riser:
d'＝Kd
in the formula: d' is the diameter of the insulated riser
K is the coefficient of the insulated riser, and 0.8 is taken
d is the diameter of the common riser, and d is 2dyIn the formula dyFor casting side wall heat-junctions, dySubstituting the data with the length of 4cm into the length of 6.4cm, and selecting a standard heat-insulating blind riser with the length of 7cm.0cm；
Insulating blind riser of roof plate waist circle:
M'cap with heating means＝(1.3～1.4)MCap with heating means
In the formula: mCap with heating meansFor preserving the natural modulus of the riser
M'Cap with heating meansIs the modulus of a heat-insulating riser, M'Cap with heating means＝1.2MTop roof，MTop roofFor the hot spot modulus, M, of the top plate of the castingTop roof＝2.6cm
The natural modulus M of the insulating blind riser of the waist circle of the top plate is calculated by the formulaCap with heating meansThe existing waist-round heat-preservation blind riser with the natural modulus of 2.4cm and the size specification of 80mm multiplied by 240mm is selected as 2.2 cm-2.4 cm;
and (3) patching the side plate heat-insulating blind riser and the top plate waist circle heat-insulating blind riser:
according to the formula L of the effective riser compensation distance, the riser area and the tail end area are 2T +2.5T[1]Determining the height of the feeder head patch according to the calculation result, determining the size of the feeder head patch according to a rolling circle method,
riser on top of mainboard
MCap with heating means＝(1.2～1.3)MMaster and slave
In the formula: mCap with heating meansIs the modulus of the riser
MMaster and slaveFor casting main board module, MMaster and slave≈2cm
After substituting data MCap with heating meansSelecting a main board open-top riser with the modulus of 2.5cm and the size specification of 150mm multiplied by 100mm as 2.4 cm-2.6 cm;
designing a chill and a riser patching of a main board:
the joint of the main board and the partition board is provided with an arc chiller
Mr＝V0/(A0+AC)
In the formula: mr is the actual modulus of the cold iron part of the casting hot spot
V0Is the geometric volume at the hot spot of the casting, V0＝172.6cm3
AOIs the heat dissipation area of the casting at the hot spot without chill, AO＝62.8cm2
ACIs a chilling blockArea of contact with the hot spot of the casting, AC＝62.8cm2
After substituting data, Mr is approximately equal to 1.37 cm; due to MMaster and slave≈2cm，MMaster and slaveMr is approximately equal to 1.46, so that the modulus of a hot junction between the main plate and the partition plate is reduced by the arc chilling block, and the main plate can be used as a feeding channel to realize effective feeding of a top feeder to the hot junction;
the middle part of the clapboard is provided with a single-sided plate-shaped chilling block:
because the thickness of the partition board is thin, the effective feeding distance of the side board heat-insulating blind riser to the partition board is small, in order to ensure the tissue compactness of the partition board with the key wall thickness, a partition board area outside the effective feeding distance of the side board heat-insulating blind riser is covered by a plate-shaped chilling block of 100mm multiplied by 90mm, according to the heat balance principle, when the thickness of the chilling block is half of the thickness of the chilled part of the casting, the chilling block can play the maximum chilling effect, according to the production practice, the thickness of the chilling block is 0.7 times of the thickness of the casting, namely 0.7 multiplied by 14mm is 9.8mm, and 10mm is taken;
square chilling block at bottom of main board
According to the design principle that the thickness of a tail end chilling block is equal to the wall thickness of a casting, the cross section of a square chilling block 7 at the bottom of a main plate is designed to be 40mm multiplied by 40mm, and the length of the chilling block is taken as 2.5 times of the thickness of the casting, so that the length of the chilling block is 100 mm;
main board open top riser head patch
The height H of the main plate is 250mm, the thickness T is 40mm, the width-thickness ratio H of the section of the main plate is 6.25:1, the main plate belongs to a plate-shaped casting, and according to an effective feeding distance formula of a plate-shaped cast steel feeder head of the square chill at the tail end, L is a feeder head area + a tail end area is 2T +2.5T +50mm, wherein L is an effective feeding distance, T is the thickness of the casting wall, T is 40mm, and 50mm is an extension value of the effective feeding distance of the main plate open top feeder head after the square chill at the tail end is added. And substituting the data to obtain the effective feeding distance L of the main plate open top feeder, which is 230 mm. The height H of the main board is 250mm and is larger than the effective feeding distance of the main board open top riser, the effective feeding distance of the main board open top riser needs to be increased by adding a patch, the height H of the patch of the main board open top riser is H-L which is 20mm, the height of the patch of the main board open top riser is reduced by the square chilling block, the patch is convenient to set and remove, in order to improve the compactness of a casting, the patch height H of the main board open top riser is designed to be 50mm, and the patch size of the main board open top riser is determined according to a rolling circle method;
gating system design
Flow-resisting sectional area F in pouring systemResistance device
FResistance device＝Q/(K×t×L)
In the formula: q is the total mass of the molten steel poured into the casting mould, and is 156 Kg;
k is the pouring specific speed and is determined by the relative density of the casting, and K is 0.6 Kg/(cm)2·s)
L is a flow correction coefficient and is 1.0
t is the pouring time(s),
Figure BDA0002309931800000041
wherein C is a coefficient determined by the relative density of the casting, and is 0.8, and t is approximately equal to 10 s; after substituting data FResistance device＝26cm2；
Gating system type and cross-sectional dimensions:
according to the structural characteristics of the product, an open type vertical gap pouring system is selected, and a sprue and ingate two-component structure is selected, wherein the section proportion sigma F of the two componentsStraight bar：∑FInner part1: 1.6; the sprue is a choked flow section, a phi 60 straight pouring pipe is selected, and the sectional area is about 28cm2(ii) a The cross section area of the gap ingate is about 45cm2
Design of sand core
The sand core structure is integral, the main body part fully reduces sand to form a hollow, the depth of the hollow exceeds 20mm of the main body, the sand eating capacity of the main body part of the sand core is 25mm, and the height of the core head is 50 mm.
Preferably, the casting process design of the cast steel node selects the following main process parameters: the casting shrinkage rate is 2%; adding the rest to obtain 4 mm; according to the size requirement of the key wall thickness of 14 +/-1 mm, the draft angle is 0.4 degrees, and the wall thickness is increased or decreased; according to the problem that the frame body thin plate structure is greatly prevented from deforming due to shrinkage, the frame body and the T-shaped top plate are provided with 1.5mm of reverse deformation, and the sand core is designed into a free-form hollow type.
Compared with the prior art, the invention has the beneficial effects that: the cold iron is scientifically arranged, the temperature gradient which is beneficial to the riser to exert the feeding effect is formed while the local hot spot is eliminated, the effective feeding area of the riser is expanded by utilizing riser feeding, the sequential solidification is realized, and the method is a main way for improving the tissue compactness of the plate type steel casting. The design of a pouring system with large flow, low flow speed and layer-by-layer introduction has obvious effect on improving the forming quality of the frame-shaped thin-wall structure casting, and is beneficial to preventing the casting from deforming and improving the feeding capacity of a riser. When the casting process of the frame-shaped thin-wall structure casting is designed, the deformation trend is correctly pre-judged, the sand reducing holes are reasonably designed to reduce the shrinkage resistance, and the anti-deformation amount is properly set to control the size precision of the casting.
Drawings
FIG. 1 is a schematic diagram of a conventional product structure;
FIG. 2 is a drawing illustration of a prior art product;
FIG. 3 is a drawing of a casting according to the present invention;
FIG. 4 is a casting process diagram of the present invention;
FIG. 5 is a schematic view of the gating system of the present invention;
fig. 6 is a schematic view of a sand core of the present invention.
In the figure: 1 a top plate waist circle heat insulation blind riser, 2 a main plate open top riser, 3 a side plate heat insulation blind riser, 4 a riser patching at the lower part of the riser, 5 plate-shaped chills, 6 circular arc chills, 7 square chills and 8 core heads.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to carry out technical verification and non-batch production, so that sodium silicate sand is selected for manual molding and core making, and the existing sand boxes with the size specification of 1000 multiplied by 700 multiplied by 300 in a workshop are used, one sand box is used; according to the requirements of product structure and dimensional accuracy, the core box and the outer mold adopt cast aluminum alloy, and an integral sand core and a one-core are designed; the parting surface is shown in figure 3, so that the main body structure is in the lower mold; introducing molten steel layer by adopting a vertical gap type pouring system; the feeder head, the chilling block and the patch are reasonably arranged, the cooling conditions of the connecting hot junction and the partition plate are improved, and the feeding capacity of the feeder head is enhanced.
Referring to fig. 4, the present invention provides a technical solution: a casting process design of a frame-shaped structure cast steel node for engineering construction comprises the following steps:
design of a riser: the casting head comprises a top plate waist circle heat insulation blind riser 1, a main plate open top riser 2, a side plate heat insulation blind riser 3 and a riser head patch 4 arranged at the lower part of the riser head, so that casting heat nodes are ensured to be all in the riser head feeding range, and the size of the riser head is calculated according to the size of a casting arrangement patch part;
side plate insulation blind riser 3:
d'＝Kd
in the formula: d' is the diameter of the insulated riser
K is the coefficient of the insulated riser, and 0.8 is taken
d is the diameter of the common riser, and d is 2dyIn the formula dyFor casting side wall heat-junctions, dySubstituting the data with the length of 4cm into the length of 6.4cm, and selecting a standard heat-preservation blind riser with the length of 7.0 cm;
top plate waist circle insulation blind riser 1:
M'cap with heating means＝(1.3～1.4)MCap with heating means
In the formula: mCap with heating meansFor preserving the natural modulus of the riser
M'Cap with heating meansIs the modulus of a heat-insulating riser, M'Cap with heating means＝1.2MTop roof，MTop roofFor the hot spot modulus, M, of the top plate of the castingTop roof＝2.6cm
The natural modulus M of the insulating blind riser of the waist circle of the top plate is calculated by the formulaCap with heating meansThe existing waist-round heat-preservation blind riser with the natural modulus of 2.4cm and the size specification of 80mm multiplied by 240mm is selected as 2.2 cm-2.4 cm;
the side plate heat-insulating blind riser 3 and the top plate waist circle heat-insulating blind riser 1 are attached:
according to the formula L of the effective riser compensation distance, the riser area and the tail end area are 2T +2.5T[1]Determining the height of the feeder head patch according to the calculation result, determining the size of the feeder head patch according to a rolling circle method,
main board open top riser 2
MCap with heating means＝(1.2～1.3)MMaster and slave
In the formula: mCap with heating meansIs the modulus of the riser
MMaster and slaveFor casting main board module, MMaster and slave≈2cm
After substituting data MCap with heating meansSelecting a main board open top riser 2 with the modulus of 2.5cm and the size specification of 150mm multiplied by 100mm as 2.4 cm-2.6 cm;
designing a chill and a riser patching of a main board:
the joint of the main board and the partition board is provided with an arc chiller 6
Mr＝V0/(A0+AC)[1]
In the formula: mr is the actual modulus of the cold iron part of the casting hot spot
V0Is the geometric volume at the hot spot of the casting, V0＝172.6cm3
AOIs the heat dissipation area of the casting at the hot spot without chill, AO＝62.8cm2
ACThe contact area between the chiller and the hot spot of the casting, AC＝62.8cm2
After substituting data, Mr is approximately equal to 1.37 cm; due to MMaster and slave≈2cm，MMaster and slaveMr is approximately equal to 1.46, so that the modulus of a joint hot junction of the main plate and the partition plate is reduced by the arc chilling block 6, and the main plate can be used as a feeding channel to realize effective feeding of a top feeder to the hot junction;
the middle part of the clapboard is provided with a single-sided plate-shaped chilling block 5:
because the thickness of the partition board is thin, the effective feeding distance of the side board heat-insulating blind riser 3 to the partition board is small, in order to ensure the tissue compactness of the partition board with the key wall thickness, a partition board area outside the effective feeding distance of the side board heat-insulating blind riser 3 is covered by a plate-shaped chilling block 5 with the thickness of 100mm multiplied by 90mm, according to the heat balance principle, when the thickness of the chilling block is half of the thickness of a chilled part of a casting, the chilling block can play the maximum chilling effect, according to the production practice, the thickness of the chilling block is 0.7 times of the thickness of the casting, namely 0.7 multiplied by 14mm is 9.8mm, and 10mm is taken;
square chilling block 7 at bottom of main board
According to the design principle that the thickness of a tail end chilling block is equal to the wall thickness of a casting, the cross section of a square chilling block (7) at the bottom of a main plate is designed to be 40mm multiplied by 40mm, and the length of the chilling block is taken according to 2.5 times of the thickness of the casting, so that the length of the chilling block is 100 mm;
main board open top riser 2 patch
The height H of the main plate is 250mm, the thickness T of the main plate is 40mm, the width-thickness ratio H of the section of the main plate is 6.25:1, the main plate belongs to a plate-shaped casting, according to an effective feeding distance formula of a plate-shaped cast steel riser with a square chill 7 at the tail end, L is a riser area + a tail end area is 2T +2.5T +50mm, L is an effective feeding distance, T is a casting wall thickness, T is 40mm, 50mm is an extension value of the effective feeding distance of the main plate open top riser 2 after the square chill 7 is added at the tail end, and the effective feeding distance L of the main plate open top riser (2) is 230mm after data are substituted. The height H of the main board is 250mm and is larger than the effective feeding distance of the main board open top riser (2), the effective feeding distance of the main board open top riser 2 needs to be increased by adding a patch, the height H of the patch of the main board open top riser (2) is H-L which is 20mm, the height of the patch of the main board open top riser 2 is reduced by the square chilling block 7, the patch is convenient to set and remove, in order to improve the compactness of a casting, the patch height H of the main board open top riser 2 is designed to be 50mm, and the patch size of the main board open top riser 2 is determined according to a rolling circle method;
gating system design
Flow-resisting sectional area F in pouring systemResistance device
FResistance device＝Q/(K×t×L)
In the formula: q is the total mass of the molten steel poured into the casting mould, and is 156 Kg;
k is the pouring specific speed and is determined by the relative density of the casting, and K is 0.6 Kg/(cm)2·s)
L is a flow correction coefficient and is 1.0
t is the pouring time(s),
Figure BDA0002309931800000081
wherein C is a coefficient determined by the relative density of the casting, and is 0.8, and t is approximately equal to 10 s; after substituting data FResistance device＝26cm2；
As shown in fig. 5, the gating system type and cross-sectional dimensions:
according to the structural characteristics of the product, an open type vertical gap pouring system is selected, and a sprue and ingate two-component structure is selected, wherein the section proportion sigma F of the two componentsStraight bar：∑FInner part1: 1.6; the sprue is a choked flow section, a phi 60 straight pouring pipe is selected, and the sectional area is about 28cm2(ii) a The cross section area of the gap ingate is about 45cm2
Design of the Sand core, as shown in FIG. 6
The sand core structure is integral, the main body part fully reduces sand to form a hollow, the depth of the hollow exceeds 20mm of the main body, the sand eating capacity of the main body part of the sand core is 25mm, and the height of the core head is 8mm and 50 mm.
As shown in fig. 3, the casting process design of the cast steel node selects the following main process parameters: the casting shrinkage rate is 2%; adding the rest to obtain 4 mm; according to the size requirement of the key wall thickness of 14 +/-1 mm, the draft angle is 0.4 degrees, and the wall thickness is increased or decreased; according to the problem that the frame body thin plate structure is greatly prevented from deforming due to shrinkage, the frame body and the T-shaped top plate are provided with 1.5mm of reverse deformation, and the sand core is designed into a free-form hollow type.
And designing and manufacturing a mould and a core box according to a casting process diagram, and carrying out core making, modeling and pouring. The size detection of the produced casting meets the requirements of a drawing, the integral deformation is within 1mm, the surface magnetic powder inspection has no crack defects, the casting is dissected according to a dissected position diagram, the section is compact and has no shrinkage porosity, a body tensile sample is prepared according to a sample diagram for testing, and the mechanical property meets the related requirements of G20Mn5 steel in the cast steel node standard.
The cold iron is scientifically arranged, so that a temperature gradient which is beneficial to the riser to exert a feeding effect is formed while a local hot spot is eliminated, the effective feeding area of the riser is expanded by utilizing riser feeding, sequential solidification is realized, and the method is a main way for improving the tissue compactness of the plate type steel casting. The design of a pouring system with large flow, low flow speed and layer-by-layer introduction has obvious effect on improving the forming quality of the frame-shaped thin-wall structure casting, and is beneficial to preventing the casting from deforming and improving the feeding capacity of a riser. When the casting process of the frame-shaped thin-wall structure casting is designed, the deformation trend is correctly pre-judged, the sand reducing holes are reasonably designed to reduce the shrinkage resistance, and the anti-deformation amount is properly set to control the size precision of the casting.
The cast steel node designed and produced according to the casting process concept can meet the technical requirements, thereby proving that the casting process scheme and design are more scientific and feasible
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. A casting process design of a frame-shaped structure cast steel node for engineering construction is characterized in that:
design of a riser: the casting head comprises a top plate waist circle heat insulation blind riser (1), a main plate open top riser (2), a side plate heat insulation blind riser (3) and a riser feeding patch (4) arranged at the lower part of the riser, so that casting heat nodes are ensured to be in the riser feeding range, and the size of the riser is calculated according to the size of a casting arrangement patch part;
side plate insulating blind riser (3):
d'＝Kd
in the formula: d' is the diameter of the insulated riser
K is the coefficient of the insulated riser, and 0.8 is taken
d is the diameter of the common riser, and d is 2dyIn the formula dyFor casting side wall heat-junctions, dy＝4cm
Substituting the data into a standard thermal insulation blind riser d 'of 6.4cm and selecting a standard thermal insulation blind riser d' of 7.0 cm;
the top plate waist circle heat preservation blind riser (1):
M'cap with heating means＝(1.3～1.4)MCap with heating means
In the formula: mCap with heating meansFor preserving the natural modulus of the riser
M'Cap with heating meansIs the modulus of a heat-insulating riser, M'Cap with heating means＝1.2MTop roof，MTop roofFor the hot spot modulus, M, of the top plate of the castingTop roof＝2.6cm
The natural modulus M of the insulating blind riser of the waist circle of the top plate is calculated by the formulaCap with heating means2.2 cm-2.4 cm, and the natural modulus of the traditional material is 2.4cm,A waist-round heat-insulating blind riser with the size specification of 80mm multiplied by 240 mm;
the side plate heat-insulating blind riser (3) and the top plate waist circle heat-insulating blind riser (1) are subsidized:
according to the formula L of the effective riser compensation distance, the riser area and the tail end area are 2T +2.5T[1]Determining the height of the feeder head patch according to the calculation result, determining the size of the feeder head patch according to a rolling circle method,
main board rising head (2)
MCap with heating means＝(1.2～1.3)MMaster and slave
In the formula: mCap with heating meansIs the modulus of the riser
MMaster and slaveFor casting main board module, MMaster and slave≈2cm
After substituting data MCap with heating meansSelecting a main board open top riser (2) with the modulus of 2.5cm and the size specification of 150mm multiplied by 100mm, wherein the main board open top riser is 2.4 cm-2.6 cm;
designing a chill and a riser patching of a main board:
the joint of the main board and the clapboard is provided with a circular arc chiller (6)
Mr＝V0/(A0+AC)
In the formula: mr is the actual modulus of the cold iron part of the casting hot spot
V0Is the geometric volume at the hot spot of the casting, V0＝172.6cm3
AOIs the heat dissipation area of the casting at the hot spot without chill, AO＝62.8cm2
ACThe contact area between the chiller and the hot spot of the casting, AC＝62.8cm2
After substituting data, Mr is approximately equal to 1.37 cm; due to MMaster and slave≈2cm，MMaster and slaveMr is approximately equal to 1.46, so that the modulus of a joint hot junction of the main plate and the partition plate is reduced by the arc chilling block (6), and the main plate can be used as a feeding channel to realize effective feeding of a top riser to the hot junction;
the middle part of the clapboard is provided with a single-sided plate-shaped chilling block (5):
because the thickness of the partition board is thin, the effective feeding distance of the side board heat-insulating blind riser (3) to the partition board is small, in order to ensure the tissue compactness of the partition board with the key wall thickness, a partition board area outside the effective feeding distance of the side board heat-insulating blind riser (3) is covered by a plate-shaped chilling block (5) with the thickness of 100mm multiplied by 90mm, according to the heat balance principle, when the thickness of the chilling block is half of the thickness of the chilled part of the casting, the chilling block can play the maximum chilling effect, according to the production practice, the thickness of the chilling block is 0.7 times of the thickness of the casting, namely 0.7 multiplied by 14mm is 9.8mm, and 10mm is taken;
square chilling block bottom main board (7)
According to the design principle that the thickness of a tail end chilling block is equal to the wall thickness of a casting, the cross section of a square chilling block (7) at the bottom of a main plate is designed to be 40mm multiplied by 40mm, and the length of the chilling block is taken according to 2.5 times of the thickness of the casting, so that the length of the chilling block is 100 mm;
main board open top riser (2) patch
The height H of the main plate is 250mm, the thickness T of the main plate is 40mm, the width-thickness ratio H of the section of the main plate is 6.25:1, the main plate belongs to a plate-shaped casting, according to the formula of the effective feeding distance of a plate-shaped cast steel riser of the square chill (7) at the tail end, L is 2T +2.5T +50mm in a riser area + a tail end area, L is an effective feeding distance, T is the thickness of the casting, T is 40mm, 50mm is an extension value of the effective feeding distance of the main plate open top riser (2) after the square chill (7) is added at the tail end, and the effective feeding distance L of the main plate open top riser (2) is 230mm after data are substituted. The height H of the main board is 250mm and is larger than the effective feeding distance of the main board open top riser (2), the effective feeding distance of the main board open top riser (2) needs to be increased by adding a patch, the height H of the patch of the main board open top riser (2) is H-L which is 20mm, the height of the patch of the main board open top riser (2) is reduced by the square chilling block (7), the patch is convenient to set and remove, in order to improve the compactness of a casting, the patch height H of the main board open top riser (2) is designed to be 50mm, and the patch size of the main board open top riser (2) is determined according to a rolling circle method;
gating system design
Flow-resisting sectional area F in pouring systemResistance device
FResistance device＝Q/(K×t×L)
In the formula: q is the total mass of the molten steel poured into the casting mould, and is 156 Kg;
k is the pouring specific speed and is determined by the relative density of the casting, and K is 0.6 Kg/(cm)2·s)
L is a flow correction coefficient and is 1.0
t is the pouring time(s),
Figure FDA0002309931790000031
wherein C is a coefficient determined by the relative density of the casting, and is 0.8, and t is approximately equal to 10 s; after substituting data FResistance device＝26cm2；
Gating system type and cross-sectional dimensions:
according to the structural characteristics of the product, an open type vertical gap pouring system is selected, and a sprue and ingate two-component structure is selected, wherein the section proportion sigma F of the two componentsStraight bar：∑FInner part1: 1.6; the sprue is a choked flow section, a phi 60 straight pouring pipe is selected, and the sectional area is about 28cm2(ii) a The cross section area of the gap ingate is about 45cm2；
Design of sand core
The sand core structure is integral, the main body part fully reduces sand to form a hollow, the depth of the hollow exceeds 20mm of the main body, the sand eating capacity of the main body part of the sand core is 25mm, and the height of the core head (8) is 50 mm.
2. The process design of the casting technology of the frame-shaped structural cast steel node for the engineering construction according to claim 1, wherein the casting technology comprises the following steps: the casting process design of the cast steel node selects the following main process parameters: the casting shrinkage rate is 2%; adding the rest to obtain 4 mm; according to the size requirement of the key wall thickness of 14 +/-1 mm, the draft angle is 0.4 degrees, and the wall thickness is increased or decreased;
according to the problem that the frame body thin plate structure is greatly prevented from deforming due to shrinkage, the frame body and the T-shaped top plate are provided with 1.5mm of reverse deformation, and the sand core is designed into a free-form hollow type.
CN201911254737.5A 2019-12-10 2019-12-10 Casting process design of frame-shaped structure cast steel node for engineering building Pending CN111036850A (en)

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