CN109202013A - A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting - Google Patents
A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting Download PDFInfo
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- CN109202013A CN109202013A CN201811226589.1A CN201811226589A CN109202013A CN 109202013 A CN109202013 A CN 109202013A CN 201811226589 A CN201811226589 A CN 201811226589A CN 109202013 A CN109202013 A CN 109202013A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like 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
- B22C9/22—Moulds for peculiarly-shaped castings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
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- Mold Materials And Core Materials (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, is related to castings production technical field.The following steps are included: mold manufacture, melting removal of impurities, ingredient supplement, compactedization breed, moulding by casting, cooling and shaping, peeling.The present invention guarantees that same casting different parts nodulizing rate differs 5-10%, meet all-hydraulic steering gear body shell casting to nodulizing rate uniformity requirement, solves the big oil leak of all-hydraulic steering gear body shell, explosion, weight, wear-resisting resistance to pressure difference, the defects of service life is low, casting manufacturability is poor.
Description
Technical field
The present invention relates to castings production technical fields, and in particular to a kind of vermicular cast iron all-hydraulic steering gear body shell casting
Casting technique.
Background technique
As engineering machinery steering system all-hydraulic steering gear, belong to and turn to security personnel's element, working environment is severe, bears random
Then change impacts stress, casting quality require I class.Currently, all-hydraulic steering gear body shell is all made of gray cast iron material, actually make
Poor with high trade mark gray cast iron production all-hydraulic steering gear body shell, casting character with showing in the process, nonuniform organization is fine and close resistance to
It forces down, there is thick big section oil ports oil leak easily occurs, or even the safety accident of body shell explosion occurs；It is complete in order to guarantee simultaneously
Hydraulic steering gear body shell bears random change impacts stress, and from safe design principle angle, the strength of materials is lower, it is desirable that turns to
Body shell has bigger safe wall thickness, and increases diverter weight, can not adapt to engineering machinery vehicle drop and need again.
Vermicular cast iron mechanical property is between gray cast iron and spheroidal graphite cast-iron, as tensile strength, elongation, flexural fatigue are strong
Degree is better than gray cast iron, and close to ferrite ductile cast iron.The sensitivity profile of vermicular cast iron is much smaller compared with common grey iron, therefore
Mechanical property on its thick big section is still relatively uniform.Furthermore its wearability is better than inoculation cast iron and high phosphorus wear resistant cast iron.It is prominent
Out the advantages of is yield tensile ratio highest in casting alloy, and thermal conductivity and thermal fatigue resistance are more much higher than spheroidal graphite cast-iron, this is compacted ink
The outstanding advantages of cast iron.Anti- growth and the more other cast irons of inoxidizability are all high, and there are also good processing performances.Machining
Property be better than spheroidal graphite cast-iron, casting character is close to low trade mark gray cast iron, and shrinkage cavity and porosity tendency is less than spheroidal graphite cast-iron, therefore founder
Skill is fairly simple.But since this casting section thickness great disparity is larger, wall thickness difference causes cooling velocity different, so that same casting is different
Position nodulizing rate differs 30-40%(technical requirements nodulizing rate difference≤10%), vermicular graphite iron material is affected in hydro-steering
Application on device.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of founder of vermicular cast iron all-hydraulic steering gear body shell casting
Skill guarantees same casting different parts nodulizing rate difference 5-10%, meets all-hydraulic steering gear body shell casting to nodulizing rate uniformity
It is required that solving the big oil leak of all-hydraulic steering gear body shell, explosion, weight, wear-resisting resistance to pressure difference, the service life is low, casting manufacturability is poor etc. lacks
It falls into.
In order to achieve the above object, technical solution of the present invention is achieved by the following technical programs:
A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, comprising the following steps:
(1) production and moulding all-hydraulic steering gear body shell die for blank, controlling shrinking percentage when Mold Making is 0.75%, casting
System is intake, using semi-enclosed casting system, running channel section ratio A is straight: A using intermediate injection from casting thickness hydraulic fluid port face
It is horizontal: in A=2:3:1, manufacture with tide mould sand mold by above-mentioned and high-pressure molding machine is used to produce casting mold, and use resinae sand core；
(2) all-hydraulic steering gear body shell blank is cast using vermicular cast iron, the Q10 pig iron, steel scrap and compacted iron foundry returns is added molten
In furnace, it is warming up to 1520-1550 DEG C of progress melting, is cleaned after melting 50-60min, then each chemistry is detected by spectrum analysis
The content of ingredient adds 65MnFe, carburant and 90 silicon carbide according to testing result, obtains molten iron after continuing melting 10-20min；
(3) ladle bottom is added in vermiculizer, using dam-type ladle bottom pouring process, covering one layer of granularity on it is 3-5mm's
Silicon barium calcium inovulant, keeping the temperature of molten iron is 1480-1500 DEG C, and molten iron is added and carries out compactedization inoculation, vermiculizer
Additional amount is the 0.4-0.6% of molten steel quality, when the amount that molten iron is added is the 1/3 of total molten iron, Sn is added with stream and granularity is
The silicon barium calcium inovulant of 0.5-1mm75 carries out late inoculation, short fiber/glass fiber silk, covering surface is covered after the completion of molten iron casting
Product accounts for the 3/4 of upper surface, stays 1/4 area to ignite compactedization reaction；
(4) using the compacted iron die modeling in above-mentioned steps (1), lower loam core, mould assembling will be pregnant by compactedization in above-mentioned steps (3)
The molten iron for educating processing is poured, and the duration of pouring controls within 5min, is carried out peeling after being cooled to room temperature, is obtained this hair
It is bright.
Preferably, loam core is equipped in step (1) in tide mould sand mold and is vented piece sum aggregate gas bag, is equipped with exhaust in mud core mould
Channel is connected after lower core with tide mould sand type exhaust piece, collection gas bag.
Preferably, tide mould sand mold is equipped with strainer at sprue in step (1), and strainer is double-deck 1.5 × 1.5 fibers filter
Net or ceramic filter screen.
Preferably, resinae Core properties index in step (1): tensile strength 2.2-2.5Mpa, gas forming amount 11-12ml/
G, granularity 70/140, and the spraying of resinae sand core surface, brushing or one layer of oxidation iron-dope of dip-coating.
Preferably, in step (2) material composition of vermicular cast iron all-hydraulic steering gear body shell casting mass percent are as follows:
Q10 pig iron 35-40%, steel scrap 25-30%, 65MnFe 0.45-0.55%, carburant 0.8-1.2%, 90 silicon carbide 0.8-1.2%, Sn
Powder 0.45-0.55%, compacted iron foundry returns 30-35%.
Preferably, in step (2) vermicular cast iron all-hydraulic steering gear body shell casting according to mass percent by following chemistry
At being grouped as: C 3.5-3.7%, Mn 0.24-0.28%, Si 2.2-2.4%, Sn 0.40-0.50%, Gr 0.08-0.12%, Ti
1.4-1.6%, Mo 0.08-0.10%, S 0.40-0.50%, P 0.12-0.14%, surplus Fe.
Preferably, carburant is magnesium iron carburant in step (2), and magnesium iron carburant is according to mass percent by following chemistry
At being grouped as: C>98.5%, S<0.05%, P 0.8-1.2%.
Preferably, 90 silicon carbide need to be 1520-1550 DEG C through expanding treatment, smelting temperature in step (2), melting 3-
5min, 90 carborundum granularity obtained are 1-3mm.
Preferably, vermiculizer is consisted of the following compositions according to mass percent in step (3): Ningxia rare earth 7-8%, Mg 3-
4%、Si 43-47%、Fe 38-44%、Al 1.5-2.5%。
The present invention provides a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, excellent compared with prior art
Point is:
(1) present invention is specifically limited by the manufacturing condition to all-hydraulic steering gear body shell die for blank, and passes through half
Closed casting system intakes from centre injection and from thickness hydraulic fluid port face, makes the vermicular cast iron hydro-steering body cast out
Shell die for blank precision is high, mold inner-cavity without cosmetic issues such as recess, protrusions, convenient for all-hydraulic steering gear body shell blank at
Type；
(2) present invention adds the chemical components such as Gr, Ti, Mo, Sn in molten iron raw material, so that carbon-gathered in austenite when eutectic
Stabilization will not be spread, and promote the stability of pearlite, effectively improve the wearability and fatigue resistance of product；
(3) molten iron of the present invention is after qualitative, quantitative compactedization inoculation, the vermicular cast iron all-hydraulic steering gear body shell cast out
Blank is through detecting, tensile strength sigma b=400-450Mpa, nodulizing rate >=80%, and same casting different parts nodulizing rate differs 5-
10%, compacted graphite number increased significantly and be uniformly distributed, and as-cast pearlitic >=85%, Mechanical processing of casting is at finished product body shell through 24 hours
50Mpa signal detecting without perspiration phenomenon, solve larger all-hydraulic steering gear body shell different parts nodulizing rate difference, oil leak, explosion,
Weight is big, wear-resisting resistance to pressure difference, the defects of service life is low, casting manufacturability is poor.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to the embodiment of the present invention pair
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Embodiment 1:
A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, comprising the following steps:
(1) production and moulding all-hydraulic steering gear body shell die for blank, controlling shrinking percentage when Mold Making is 0.75%, casting
System is intake, using semi-enclosed casting system, running channel section ratio A is straight: A using intermediate injection from casting thickness hydraulic fluid port face
It is horizontal: in A=2:3:1, manufacture with tide mould sand mold by above-mentioned and high-pressure molding machine is used to produce casting mold, and use resinae sand core；
(2) all-hydraulic steering gear body shell blank is cast using vermicular cast iron, the Q10 pig iron, steel scrap and compacted iron foundry returns is added molten
In furnace, it is warming up to 1520-1550 DEG C of progress melting, is cleaned after melting 50-60min, then each chemistry is detected by spectrum analysis
The content of ingredient adds 65MnFe, carburant and 90 silicon carbide according to testing result, obtains molten iron after continuing melting 10-20min；
(3) ladle bottom is added in vermiculizer, using dam-type ladle bottom pouring process, covering one layer of granularity on it is 3-5mm's
Silicon barium calcium inovulant, keeping the temperature of molten iron is 1480-1500 DEG C, and molten iron is added and carries out compactedization inoculation, vermiculizer
Additional amount is the 0.4-0.6% of molten steel quality, when the amount that molten iron is added is the 1/3 of total molten iron, Sn is added with stream and granularity is
The silicon barium calcium inovulant of 0.5-1mm75 carries out late inoculation, short fiber/glass fiber silk, covering surface is covered after the completion of molten iron casting
Product accounts for the 3/4 of upper surface, stays 1/4 area to ignite compactedization reaction；
(4) using the compacted iron die modeling in above-mentioned steps (1), lower loam core, mould assembling will be pregnant by compactedization in above-mentioned steps (3)
The molten iron for educating processing is poured, and the duration of pouring controls in 9-10min, is carried out peeling after being cooled to room temperature, is obtained this hair
It is bright.
Wherein, loam core is equipped in step (1) in tide mould sand mold and is vented piece sum aggregate gas bag, it is logical to be equipped with exhaust in mud core mould
Road is connected after lower core with tide mould sand type exhaust piece, collection gas bag；Tide mould sand mold is equipped with strainer, filter at sprue in step (1)
Net is double-deck 1.5 × 1.5 fabric screens or ceramic filter screen；Resinae Core properties index in step (1): tensile strength 2.2-
2.5Mpa, gas forming amount 11-12ml/g, granularity 70/140, and one layer of spraying of resinae sand core surface, brushing or dip-coating iron oxide apply
Material；The mass percent of the material composition of vermicular cast iron all-hydraulic steering gear body shell casting in step (2) are as follows: the Q10 pig iron 35%,
Steel scrap 30%, 65MnFe 0.45%, carburant 0.8%, 90 silicon carbide 1.2%, Sn powder 0.55%, compacted iron foundry returns 32%；Step (2)
Middle vermicular cast iron all-hydraulic steering gear body shell casting is made of according to mass percent following chemical component: C 3.7%, Mn
0.24%, Si 2.4%, Sn 0.50%, Gr 0.08%, Ti 1.4%, Mo 0.08%, S 0.5%, P 0.14%, surplus Fe；Step
(2) carburant is magnesium iron carburant in, and magnesium iron carburant is made of according to mass percent following chemical component: C>98.5%, S<
0.05%,P 0.8-1.2%；90 silicon carbide need to be 1520-1550 DEG C through expanding treatment, smelting temperature in step (2), melting 3-
5min, 90 carborundum granularity obtained are 1-3mm；Vermiculizer is consisted of the following compositions according to mass percent in step (3): peaceful
Summer rare earth 7%, Mg 4%, Si 43%, Fe 44%, Al 2%.
Embodiment 2:
A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, comprising the following steps:
(1) production and moulding all-hydraulic steering gear body shell die for blank, controlling shrinking percentage when Mold Making is 0.75%, casting
System is intake, using semi-enclosed casting system, running channel section ratio A is straight: A using intermediate injection from casting thickness hydraulic fluid port face
It is horizontal: in A=2:3:1, manufacture with tide mould sand mold by above-mentioned and high-pressure molding machine is used to produce casting mold, and use resinae sand core；
(2) all-hydraulic steering gear body shell blank is cast using vermicular cast iron, the Q10 pig iron, steel scrap and compacted iron foundry returns is added molten
In furnace, it is warming up to 1520-1550 DEG C of progress melting, is cleaned after melting 50-60min, then each chemistry is detected by spectrum analysis
The content of ingredient adds 65MnFe, carburant and 90 silicon carbide according to testing result, obtains molten iron after continuing melting 10-20min；
(3) ladle bottom is added in vermiculizer, using dam-type ladle bottom pouring process, covering one layer of granularity on it is 3-5mm's
Silicon barium calcium inovulant, keeping the temperature of molten iron is 1480-1500 DEG C, and molten iron is added and carries out compactedization inoculation, vermiculizer
Additional amount is the 0.4-0.6% of molten steel quality, when the amount that molten iron is added is the 1/3 of total molten iron, Sn is added with stream and granularity is
The silicon barium calcium inovulant of 0.5-1mm75 carries out late inoculation, short fiber/glass fiber silk, covering surface is covered after the completion of molten iron casting
Product accounts for the 3/4 of upper surface, stays 1/4 area to ignite compactedization reaction；
(4) using the compacted iron die modeling in above-mentioned steps (1), lower loam core, mould assembling will be pregnant by compactedization in above-mentioned steps (3)
The molten iron for educating processing is poured, and the duration of pouring controls within 5min, is carried out peeling after being cooled to room temperature, is obtained this hair
It is bright.
Wherein, loam core is equipped in step (1) in tide mould sand mold and is vented piece sum aggregate gas bag, it is logical to be equipped with exhaust in mud core mould
Road is connected after lower core with tide mould sand type exhaust piece, collection gas bag；Tide mould sand mold is equipped with strainer, filter at sprue in step (1)
Net is double-deck 1.5 × 1.5 fabric screens or ceramic filter screen；Resinae Core properties index in step (1): tensile strength 2.2-
2.5Mpa, gas forming amount 11-12ml/g, granularity 70/140, and one layer of spraying of resinae sand core surface, brushing or dip-coating iron oxide apply
Material；The mass percent of the material composition of vermicular cast iron all-hydraulic steering gear body shell casting in step (2) are as follows: the Q10 pig iron 38%,
Steel scrap 27%, 65MnFe 0.50%, carburant 1.0%, 90 silicon carbide 1.0%, Sn powder 0.50%, compacted iron foundry returns 32%；Step (2)
Middle vermicular cast iron all-hydraulic steering gear body shell casting is made of according to mass percent following chemical component: C 3.6%, Mn
0.26%, Si 2.3%, Sn 0.45%, Gr 0.10%, Ti 1.5%, Mo 0.09%, S 0.45%, P 0.13%, surplus Fe；Step
Suddenly carburant is magnesium iron carburant in (2), and magnesium iron carburant is made of according to mass percent following chemical component: C > 98.5%,
S<0.05%,P 0.8-1.2%；90 silicon carbide need to be 1520-1550 DEG C through expanding treatment, smelting temperature in step (2), melting 3-
5min, 90 carborundum granularity obtained are 1-3mm；Vermiculizer is consisted of the following compositions according to mass percent in step (3): peaceful
Summer rare earth 7.5%, Mg 3.5%, Si 45%, Fe 42%, Al 2%.
Embodiment 3:
A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, comprising the following steps:
(1) production and moulding all-hydraulic steering gear body shell die for blank, controlling shrinking percentage when Mold Making is 0.75%, casting
System is intake, using semi-enclosed casting system, running channel section ratio A is straight: A using intermediate injection from casting thickness hydraulic fluid port face
It is horizontal: in A=2:3:1, manufacture with tide mould sand mold by above-mentioned and high-pressure molding machine is used to produce casting mold, and use resinae sand core；
(2) all-hydraulic steering gear body shell blank is cast using vermicular cast iron, the Q10 pig iron, steel scrap and compacted iron foundry returns is added molten
In furnace, it is warming up to 1520-1550 DEG C of progress melting, is cleaned after melting 50-60min, then each chemistry is detected by spectrum analysis
The content of ingredient adds 65MnFe, carburant and 90 silicon carbide according to testing result, obtains molten iron after continuing melting 10-20min；
(3) ladle bottom is added in vermiculizer, using dam-type ladle bottom pouring process, covering one layer of granularity on it is 3-5mm's
Silicon barium calcium inovulant, keeping the temperature of molten iron is 1480-1500 DEG C, and molten iron is added and carries out compactedization inoculation, vermiculizer
Additional amount is the 0.4-0.6% of molten steel quality, when the amount that molten iron is added is the 1/3 of total molten iron, Sn is added with stream and granularity is
The silicon barium calcium inovulant of 0.5-1mm75 carries out late inoculation, short fiber/glass fiber silk, covering surface is covered after the completion of molten iron casting
Product accounts for the 3/4 of upper surface, stays 1/4 area to ignite compactedization reaction；
(4) using the compacted iron die modeling in above-mentioned steps (1), lower loam core, mould assembling will be pregnant by compactedization in above-mentioned steps (3)
The molten iron for educating processing is poured, and the duration of pouring controls within 5min, is carried out peeling after being cooled to room temperature, is obtained this hair
It is bright.
Wherein, loam core is equipped in step (1) in tide mould sand mold and is vented piece sum aggregate gas bag, it is logical to be equipped with exhaust in mud core mould
Road is connected after lower core with tide mould sand type exhaust piece, collection gas bag；Tide mould sand mold is equipped with strainer, filter at sprue in step (1)
Net is double-deck 1.5 × 1.5 fabric screens or ceramic filter screen；Resinae Core properties index in step (1): tensile strength 2.2-
2.5Mpa, gas forming amount 11-12ml/g, granularity 70/140, and one layer of spraying of resinae sand core surface, brushing or dip-coating iron oxide apply
Material；The mass percent of the material composition of vermicular cast iron all-hydraulic steering gear body shell casting in step (2) are as follows: the Q10 pig iron 40%,
Steel scrap 25%, 65MnFe 0.55%, carburant 1.2%, 90 silicon carbide 0.8%, Sn powder 0.45%, compacted iron foundry returns 32%；Step (2)
Middle vermicular cast iron all-hydraulic steering gear body shell casting is made of according to mass percent following chemical component: C 3.7%, Mn
0.28%, Si 2.4%, Sn 0.50%, Gr 0.12%, Ti 1.6%, Mo 0.10%, S 0.50%, P 0.14%, surplus Fe；Step
Suddenly carburant is magnesium iron carburant in (2), and magnesium iron carburant is made of according to mass percent following chemical component: C > 98.5%,
S<0.05%,P 0.8-1.2%；90 silicon carbide need to be 1520-1550 DEG C through expanding treatment, smelting temperature in step (2), melting 3-
5min, 90 carborundum granularity obtained are 1-3mm；Vermiculizer is consisted of the following compositions according to mass percent in step (3): peaceful
Summer rare earth 8%, Mg 3%, Si 47%, Fe 40%, Al 2%.
Embodiment 4:
Wearability, tensile strength, yield strength and the nodulizing rate of casting of the present invention are detected, is chosen obtained by above-described embodiment 1-3
Casting and casting common on the market, using the wearability (i.e. abrasion loss: mg) of the detection casting of rubbing manipulation back and forth, using stretching
The tensile strength (MPa) for testing machine testing casting is used using the yield strength (MPa) of yield strength test machine testing casting
Ultrasonic velocity detects the nodulizing rate (%) of casting, and using casting obtained by embodiment 1-3 as experimental group 1-3, common casting is control
Group, as a result as shown in the table:
| Group | Experimental group 1 | Experimental group 2 | Experimental group 3 | Control group |
| Abrasion loss | 9 | 11 | 6 | 18 |
| Tensile strength | 435 | 420 | 450 | 280 |
| Yield strength | 395 | 380 | 410 | 240 |
| Nodulizing rate | 79 | 76 | 83 | 60 |
As seen from the above table, since the lower wearability of abrasion loss is better, tensile strength, yield strength and its higher correspondence of nodulizing rate
Can be better, therefore the far superior to common casting of the wearability of casting obtained by the present invention, tensile strength, yield strength and nodulizing rate
Part, and the properties of casting obtained by embodiment 3 are best.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting, which comprises the following steps:
(1) production and moulding all-hydraulic steering gear body shell die for blank, controlling shrinking percentage when Mold Making is 0.75%, casting
System is intake, using semi-enclosed casting system, running channel section ratio A is straight: A using intermediate injection from casting thickness hydraulic fluid port face
It is horizontal: in A=2:3:1, manufacture with tide mould sand mold by above-mentioned and high-pressure molding machine is used to produce casting mold, and use resinae sand core；
(2) all-hydraulic steering gear body shell blank is cast using vermicular cast iron, the Q10 pig iron, steel scrap and compacted iron foundry returns is added molten
In furnace, it is warming up to 1520-1550 DEG C of progress melting, is cleaned after melting 50-60min, then each chemistry is detected by spectrum analysis
The content of ingredient adds 65MnFe, carburant and 90 silicon carbide according to testing result, obtains molten iron after continuing melting 10-20min；
(3) ladle bottom is added in vermiculizer, using dam-type ladle bottom pouring process, covering one layer of granularity on it is 3-5mm's
Silicon barium calcium inovulant, keeping the temperature of molten iron is 1480-1500 DEG C, and molten iron is added and carries out compactedization inoculation, vermiculizer
Additional amount is the 0.4-0.6% of molten steel quality, when the amount that molten iron is added is the 1/3 of total molten iron, Sn is added with stream and granularity is
The silicon barium calcium inovulant of 0.5-1mm75 carries out late inoculation, short fiber/glass fiber silk, covering surface is covered after the completion of molten iron casting
Product accounts for the 3/4 of upper surface, stays 1/4 area to ignite compactedization reaction；
(4) using the compacted iron die modeling in above-mentioned steps (1), lower loam core, mould assembling will be pregnant by compactedization in above-mentioned steps (3)
The molten iron for educating processing is poured, and the duration of pouring controls within 5min, is carried out peeling after being cooled to room temperature, is obtained this hair
It is bright.
2. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: loam core is equipped in step (1) in tide mould sand mold and is vented piece sum aggregate gas bag, is equipped with exhaust passage in mud core mould, after lower core
It is connected with tide mould sand type exhaust piece, collection gas bag.
3. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: tide mould sand mold is equipped with strainer at sprue in step (1), and strainer is double-deck 1.5 × 1.5 fabric screens or ceramic filtering
Net.
4. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: resinae Core properties index in step (1): tensile strength 2.2-2.5Mpa, gas forming amount 11-12ml/g, granularity 70/140,
And the spraying of resinae sand core surface, brushing or one layer of oxidation iron-dope of dip-coating.
5. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: the mass percent of the material composition of vermicular cast iron all-hydraulic steering gear body shell casting in step (2) are as follows: Q10 pig iron 35-
40%, steel scrap 25-30%, 65MnFe 0.45-0.55%, carburant 0.8-1.2%, 90 silicon carbide 0.8-1.2%, Sn powder 0.45-
0.55%, compacted iron foundry returns 30-35%.
6. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: vermicular cast iron all-hydraulic steering gear body shell casting is made of according to mass percent following chemical component in step (2): C
3.5-3.7%、Mn 0.24-0.28%、Si 2.2-2.4%、Sn 0.40-0.50%、Gr 0.08-0.12%、Ti 1.4-1.6%、Mo
0.08-0.10%, S 0.40-0.50%, P 0.12-0.14%, surplus Fe.
7. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: carburant is magnesium iron carburant in step (2), and magnesium iron carburant is made of according to mass percent following chemical component: C >
98.5%、S<0.05%、P 0.8-1.2%。
8. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: 90 silicon carbide need to be 1520-1550 DEG C, melting 3-5min through expanding treatment, smelting temperature in step (2), 90 carbon obtained
SiClx granularity is 1-3mm.
9. a kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting according to claim 1, feature exist
In: vermiculizer is consisted of the following compositions according to mass percent in step (3): Ningxia rare earth 7-8%, Mg 3-4%, Si 43-
47%、Fe 38-44%、Al 1.5-2.5%。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111774529A (en) * | 2020-07-03 | 2020-10-16 | 浙江汉声精密机械有限公司 | Manufacturing method of large valve plate |
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