CN116479317A - QT600-10 lifting ring and production method thereof - Google Patents
QT600-10 lifting ring and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 71
- 238000005266 casting Methods 0.000 claims abstract description 83
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000011049 filling Methods 0.000 claims abstract description 5
- 238000011081 inoculation Methods 0.000 claims description 33
- 239000000725 suspension Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910001018 Cast iron Inorganic materials 0.000 claims description 14
- 239000008188 pellet Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 239000002054 inoculum Substances 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 244000035744 Hura crepitans Species 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 19
- 239000011159 matrix material Substances 0.000 abstract description 19
- 229910001562 pearlite Inorganic materials 0.000 abstract description 15
- 229910002804 graphite Inorganic materials 0.000 abstract description 10
- 239000010439 graphite Substances 0.000 abstract description 10
- 238000005495 investment casting Methods 0.000 abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 8
- 239000010703 silicon Substances 0.000 abstract description 8
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000010949 copper Substances 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910001141 Ductile iron Inorganic materials 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 210000002489 tectorial membrane Anatomy 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
-
- 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
Abstract
A QT600-10 lifting ring and a production method thereof belong to the technical field of production of lifting rings for vehicles and solve the problems of low quality, unstable performance, long production period and high cost of the lifting rings. The method of the invention comprises the following steps: covering wet precoated sand on a mould, and then heating to solidify the mould shell; the thin shell and the low-temperature iron ball filling means around the shell are utilized, and the interlayer spacing of pearlite sheets and graphite balls in a thinned matrix structure are realized through rapid cooling, so that the QT600-10 performance requirement is met; the matrix is a mixture matrix of pearlite and ferrite, and the casting with the silicon content less than 3.0 percent has no low-temperature brittleness phenomenon. Compared with the investment casting production process, the investment casting production process only needs shell making operation, the addition amount of copper alloy in the smelting process is about 0.27 percent, the production efficiency is high, and the production cost is low. The method is suitable for preparing the QT600-10 lifting ring.
Description
Technical Field
The application relates to the technical field of automobile lifting ring production, in particular to a QT600-10 lifting ring.
Background
Because the hanging ring is an automobile bearing piece, the material is usually cast steel and QT600-5, the cast steel piece has excellent performance, but the cast steel piece has heavy weight and does not accord with the current light weight trend; compared with steel castings, ductile iron QT600-5 has equivalent strength and poorer toughness, and can not well meet the use requirements of castings.
The prior main stream means for producing QT600-10 is solid solution strengthening of silicon, and because the silicon content of the process is about 4.2 percent, the matrix is a ferrite matrix, the material is easy to cause low-temperature brittleness, and the casting is early failed in a low-temperature state.
In the prior art, as disclosed in Chinese patent publication No. CN105861917B, publication No. 05 month 31, the production method of the investment precision casting cast high-performance ductile iron QT600-10 comprises the following steps: c3.3-3.6, si 2.8-3.0, mn:0.2 to 0.4 percent, P is less than or equal to 0.035 percent, S: less than or equal to 0.02, cu:0.4-0.6, mg:0.035-0.055, RE:0.02-0.04, and the balance being Fe; and adopting a dam type spheroidizing treatment mode and a three-time inoculation mode. The produced cast mixed matrix spheroidal graphite cast iron QT600-10 meets the requirements that the tensile strength Rm is more than or equal to 600MPa and the elongation after break A is more than or equal to 10 percent. The method is combined with an investment precision casting production mode, and a cooling mode after shell pouring is controlled to realize that an investment precision casting process is used for producing high-strength high-toughness ductile iron, and is used for realizing light design development and production of automobile parts through a near net shaping process.
However, the prior art is used for producing high-performance ductile iron, and the following technical problems occur when the prior art production method is used for processing the hanging ring:
1. the carbon content of the produced high-performance ductile iron QT600-10 is low, and shrinkage porosity defects in castings cannot be reduced so that the castings are more compact;
2. higher copper content, which leads to a pearlite content too high during production, resulting in an elongation below 10%;
3. the shell manufacturing process needs the procedures of wax manufacturing mould, wax group assembling, refractory material coating, hardening and drying, dewaxing, roasting and the like, and has long production period and high production cost;
4. and the shell is blown by the fan, so that heat dissipation is accelerated, rapid cooling is realized, the energy consumption is high, uniform heat dissipation of the casting cannot be ensured, and the performance of the casting is unstable.
Disclosure of Invention
The invention aims to solve the problems of low quality, unstable performance, long production period and high cost of the existing lifting ring, and provides a QT600-10 lifting ring and a production method thereof.
The invention is realized by the following technical scheme, and in one aspect, the invention provides a production method of a QT600-10 lifting ring, which comprises the following steps:
step 1, manufacturing a shell mold by using precoated sand;
step 2, placing the shell in a sand box, and filling cast iron pellets around the shell for fixation;
step 3, molten iron smelting, specifically comprising:
adopting an intermediate frequency furnace induction furnace for smelting, and carrying out spheroidizing treatment on the molten iron components:
C:3.8-3.9％，Si：1.2-1.3％，Mn≤0.3，Cu：0.27±0.025％，Sn≤0.01％，P≤0.04％，S≤0.03％；
step 4, spheroidizing, specifically comprising:
the spheroidizing method comprises the steps of wire feeding and spheroidizing, and cored wire components: 28-30% of Mg, 2.5-4.5% of Re, 2.0-3.0% of Ca, 39-44% of Si, 12+ -1.5 m of wire feeding length, 20+ -0.5 m/min of wire feeding speed and 1490-1540 ℃ of spheroidizing temperature;
step 5, inoculation treatment, which specifically comprises:
adopting a three-time inoculation mode, inoculating for the first time, selecting 75SiFe with the thickness of 5-10mm, and placing the 75SiFe at the bottom of a pouring ladle, wherein the addition amount of the 75SiFe is 0.8-1.0% of the water yield; the second inoculation is ladle inoculation, 75SiFe with the thickness of 3-5mm is placed at the bottom of a casting ladle, and the addition amount is 1.0% -1.2% of the water yield; the third inoculation is stream inoculation, 0.2-0.7mm of BI-containing stream inoculant is selected, the addition amount is 0.15% of the casting water amount, and the casting temperature is 1400-1440 ℃;
casting final components: 3.6-3.9%, si:2.7-3.0%, mn less than or equal to 0.3, cu: 0.27+/-0.025 percent, sn is less than or equal to 0.01 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.03 percent, and Mg is 0.03-0.06 percent;
and 6, carrying out shakeout treatment after pouring, and taking out the casting.
Further, the precoated sand performance specifically comprises:
the normal temperature tensile strength is more than or equal to 3.5Mpa, the normal temperature bending strength is more than or equal to 7.0Mpa, the gas generation rate is less than or equal to 18ml/g, the melting point is 94-110 ℃, the granularity of raw sand is 100/200 meshes, the sintering temperature of the shell is 220+/-10 ℃, the shell baking time is 30-50S, and the thickness of the shell is 6-10mm.
Further, the granularity phi of the cast iron pellets is 2.5mm, the hardness is 45-65HRC, and the temperature of the cast iron pellets is less than or equal to 80 ℃.
Further, in the step 3, the furnace burden for molten iron smelting adopts waste steel of a packaged vehicle body and returned furnace burden, and the weight percentages are as follows: 70-80% of scrap steel and 20-30% of return furnace material.
Further, the phi 13 spheroidized core-spun yarn is selected as the core-spun yarn.
Further, the shell thickness is 10mm.
Further, the molten iron composition before spheroidizing: c3.8%, si:1.3%, mn 0.3%, cu:0.26%, sn0.003%, P:0.018%, S:0.006%.
Further, the casting end composition: c3.8%, si:3.0%, mn 0.3%, cu:0.26%, sn0.003%, P:0.019%, S:0.006%.
Further, step 6 is specifically:
and (5) carrying out shakeout treatment after 2 hours of pouring, and taking out the casting.
In another aspect, the present invention provides a QT600-10 suspension loop, obtainable by a method of producing a QT600-10 suspension loop as described above.
The invention has the beneficial effects that:
the invention provides a production process of a shell-type process high-performance QT600-10 hanging ring, which comprises the following steps:
firstly, the prior main stream means for producing QT600-10 is silicon solid solution strengthening, and because the silicon content of the process is about 4.2 percent, the matrix is a ferrite matrix, the material is easy to cause low-temperature brittleness, and the casting is early failed in a low-temperature state.
Secondly, compared with the prior art, the chemical composition of the invention is different from the chemical composition:
the carbon content of the invention is higher than that of the prior art, the carbon content of the invention is 3.6-3.9%, the carbon content of the prior art is 3.3-3.6%, and the high carbon content can reduce shrinkage porosity defect in the casting, so that the casting is more compact;
copper content is lower than the prior art, cu of the invention is 0.27+/-0.025%, and Cu of the prior art is 0.4-0.6, because the high copper content leads the pearlite content of the invention to be too high in the production process, thereby leading to the elongation rate to be lower than 10%;
thirdly, the shell manufacturing method is different, the wet precoated sand is covered on the mould, and then the mould shell is solidified by heating, and the procedures of wax mould manufacturing, wax group assembling, refractory material coating, hardening, drying, dewaxing, roasting and the like are needed in the shell manufacturing process in the prior art, so that the production period is long and the production cost is high;
finally, the cooling mode is different, and the invention realizes the refinement of the lamellar spacing of pearlite in the matrix structure and graphite balls by using a thin shell and a low-temperature iron ball filling means around the shell and rapid cooling, thereby meeting the QT600-10 performance requirement. In the prior art, the shell is blown by a fan to accelerate heat dissipation, so that rapid cooling is realized, the energy consumption is high, the uniform heat dissipation of the casting cannot be ensured, and the performance of the casting is unstable.
The matrix is a mixed matrix of pearlite and ferrite, and the casting with the silicon content less than 3.0% has no low-temperature brittleness phenomenon. Compared with the investment casting production process, the investment casting production process only needs shell making operation, the addition amount of copper alloy in the smelting process is about 0.27 percent, the production efficiency is high, and the production cost is low.
According to the invention, by developing a novel production process of the lifting ring, the performance of the casting is enabled to reach the tensile strength of more than or equal to 600Mpa, the yield strength of more than or equal to 400Mpa, the elongation of more than or equal to 10, and further the casting is replaced by a steel casting to realize the light weight of the casting.
The method is suitable for preparing the QT600-10 lifting ring.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a graphite of the present invention;
FIG. 2 is a substrate of the present invention;
FIG. 3 is a lamellar structure of pearlitic fine flakes according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to illustrate the present invention and should not be construed as limiting the invention.
In a first embodiment, a method for producing QT600-10 suspension loops, the method comprising:
step 1, manufacturing a shell mold by using precoated sand;
step 2, placing the shell in a sand box, and filling cast iron pellets around the shell for fixation;
step 3, molten iron smelting, specifically comprising:
adopting an intermediate frequency furnace induction furnace for smelting, and carrying out spheroidizing treatment on the molten iron components:
C:3.8-3.9％，Si：1.2-1.3％，Mn≤0.3，Cu：0.27±0.025％，Sn≤0.01％，P≤0.04％，S≤0.03％；
step 4, spheroidizing, specifically comprising:
the spheroidizing method comprises the steps of wire feeding and spheroidizing, and cored wire components: 28-30% of Mg, 2.5-4.5% of Re, 2.0-3.0% of Ca, 39-44% of Si, 12+ -1.5 m of wire feeding length, 20+ -0.5 m/min of wire feeding speed and 1490-1540 ℃ of spheroidizing temperature;
wherein, 12+ -1.5 m and 20+ -0.5 m, namely: 10.5-13.5m and 19.5-20.5.
The dyke spheroidization is a method of spheroidization by a flushing method, and the method has low and unstable spheroidization agent absorptivity and is easy to generate bad spheroidization. And a large amount of smoke dust generated in the spheroidizing process cannot be treated, so that the environment is polluted. The wire feeding method spheroidizing is to feed the spheroidizing agent into the ladle molten iron at a certain speed by using equipment, the treatment method is stable, the spheroidizing effect is good, the treatment is to treat in a wire feeding station, and smoke dust can be collected without pollution to the environment.
Step 5, inoculation treatment, which specifically comprises:
adopting a three-time inoculation mode, inoculating for the first time, selecting 75SiFe with the thickness of 5-10mm, and placing the 75SiFe at the bottom of a pouring ladle, wherein the addition amount of the 75SiFe is 0.8-1.0% of the water yield; the second inoculation is ladle inoculation, 75SiFe with the thickness of 3-5mm is placed at the bottom of a casting ladle, and the addition amount is 1.0% -1.2% of the water yield; the third inoculation is stream inoculation, and 0.2-0.7mm of BI-containing stream inoculant is selected, wherein the addition amount of the BI-containing stream inoculant is 0.15% of the casting water amount. The casting temperature is 1400-1440 ℃;
wherein 75SiFe is 75 ferrosilicon;
the water yield is the weight of pouring molten iron into a ladle;
the three inoculation is adopted to avoid the degradation of graphite morphology caused by inoculation decay, so that the performance strength is reduced, and the core of the casting nucleation gradually disappears with the extension of time in the production process, so that the core is provided.
Casting final components: 3.6-3.9%, si:2.7-3.0%, mn less than or equal to 0.3, cu: 0.27+/-0.025 percent, sn is less than or equal to 0.01 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.03 percent, and Mg is 0.03-0.06 percent;
and 6, carrying out shakeout treatment after pouring, and taking out the casting.
In the embodiment, firstly, the carbon content of the embodiment is higher than that of the prior art, the high carbon content can reduce shrinkage porosity defect in the casting, so that the casting is more compact,
copper content is lower than in the prior art because the high copper content makes the pearlite content of the present embodiment too high during production, resulting in an elongation of less than 10%;
in the embodiment, wet precoated sand is covered on a mould, and then the mould shell is solidified by heating, so that the procedures of wax-making mould, wax group making, refractory material coating, hardening, drying, dewaxing, roasting and the like are needed in the prior art shell-making process, the production period is long, and the production cost is high;
finally, the thin shell and the low-temperature iron balls filled around the shell are utilized, and the interlayer spacing of pearlite in a matrix structure and graphite balls are thinned through rapid cooling, so that the QT600-10 performance requirement is met. In the prior art, the shell is blown by a fan to accelerate heat dissipation, so that rapid cooling is realized, the energy consumption is high, the uniform heat dissipation of the casting cannot be ensured, and the performance of the casting is unstable.
The substrate of the embodiment is a pearlite and ferrite mixed substrate, and the casting with the silicon content less than 3.0% has no low-temperature brittleness phenomenon. Compared with the investment casting production process, the investment casting production process only needs shell making operation, the addition amount of copper alloy in the smelting process is about 0.27 percent, the production efficiency is high, and the production cost is low.
According to the embodiment, a novel production process of the hanging ring is developed, so that the casting performance reaches that the tensile strength is more than or equal to 600Mpa, the yield strength is more than or equal to 400Mpa, the elongation is more than or equal to 10, and further the casting is replaced by a steel casting to realize the light weight of the casting.
In a second embodiment, the method for producing QT600-10 suspension ring according to the first embodiment is further defined, where the precoated sand is further defined, and specifically includes:
the precoated sand specifically comprises the following properties:
the normal temperature tensile strength is more than or equal to 3.5Mpa, the normal temperature bending strength is more than or equal to 7.0Mpa, the gas generation rate is less than or equal to 18ml/g, the melting point is 94-110 ℃, the granularity of raw sand is 100/200 meshes, the sintering temperature of the shell is 220+/-10 ℃, the shell baking time is 30-50S, and the thickness of the shell is 6-10mm.
In this embodiment, adopt the modification can the tectorial membrane sand both guaranteed the shell intensity, the transportation process shell is unlikely to broken, can reduce the gas generation of sand mould again, prevent to produce the gas pocket, can also guarantee foundry goods surface roughness simultaneously, make foundry goods surface smoothness.
In a third embodiment, the method for producing QT600-10 suspension ring according to the first embodiment is further defined, and in the present embodiment, the cast iron pellet is further defined, and specifically includes:
the granularity phi of the cast iron pellets is 2.5mm, the hardness is 45-65HRC, and the temperature of the cast iron pellets is less than or equal to 80 ℃.
In this embodiment, the cast iron pellets according to this embodiment can be used with high heat conduction efficiency and high packing compactness.
In a fourth embodiment, the method for producing the QT600-10 suspension ring according to the first embodiment is further defined, and in the present embodiment, step 3 is further defined, and specifically includes:
in the step 3, the furnace burden for smelting the molten iron adopts waste steel of a packaged vehicle body and returned furnace burden, and the weight percentages are as follows: 70-80% of scrap steel, 20-30% of return furnace material,
in the embodiment, the content of the impurity elements in the scrap steel of the vehicle body is low, and the concentration of the impurity elements in microscopic grain boundaries can be reduced by adopting the proportion preparation, so that the performance is improved.
In a fifth embodiment, the method for producing the QT600-10 suspension ring according to the first embodiment is further defined, where the cored wire is further defined, and specifically includes:
and the phi 13 spheroidized core-spun yarn is selected as the core-spun yarn.
In the embodiment, the spheroidized cored wire with the diameter of 13mm can be selected, so that the spheroidization quality is stable, the spheroidization effect is good, and the requirement of the first embodiment on the cored wire component is met.
In a sixth embodiment, the method for producing the QT600-10 suspension ring according to the second embodiment is further defined, and in this embodiment, the shell is further defined, and specifically includes:
the thickness of the shell is 10mm.
In the embodiment, 10mm is the main wall thickness, and 10mm is selected to ensure heat transfer efficiency and shell strength.
In a seventh embodiment, the method for producing QT600-10 suspension ring according to the first embodiment is further defined, and in the present embodiment, the pre-spheroidizing molten iron component is further defined, and specifically includes:
the components of the molten iron before spheroidizing: c3.8%, si:1.3%, mn 0.3%, cu:0.26%, sn0.003%, P:0.018%, S:0.006%.
In the embodiment, the spheroidizing ratio of the body of the finally produced lifting ring casting is 2 levels, the sphere diameter is 8 levels, the spheroidizing effect is excellent, the splitting effect of graphite on a matrix is reduced, and the tensile strength of the casting is improved; the casting substrate ensures that the strength of the casting reaches more than 600Mpa, and the elongation is ensured to be more than 10.
An eighth embodiment is a further limitation of the method for producing a QT600-10 suspension ring according to the first embodiment, where the casting final component is further limited, and specifically includes:
the final composition of the casting: c3.8%, si:3.0%, mn 0.3%, cu:0.26%, sn0.003%, P:0.019%, S:0.006%.
The spheroidization rate of the lifting ring casting body in the embodiment is 2 levels, the sphere diameter is 8 levels, the spheroidization effect is excellent, the splitting effect of graphite on a matrix is reduced, and the tensile strength of the casting is improved; the casting substrate ensures that the strength of the casting reaches more than 600Mpa, and the elongation is ensured to be more than 10.
In a ninth embodiment, the method for producing the QT600-10 suspension ring according to the first embodiment is further defined, and in the embodiment, step 6 is further defined, and specifically includes:
step 6, specifically:
and (5) carrying out shakeout treatment after 2 hours of pouring, and taking out the casting.
In this embodiment, the shakeout time of the sand mold is generally 6 hours or more, and the production efficiency can be improved by shakeout in 2 hours.
Tenth embodiment, a QT600-10 suspension ring, prepared by a method of producing a QT600-10 suspension ring as described above.
The QT600-10 lifting ring in the embodiment has higher carbon content than the prior art, the high carbon content can reduce shrinkage porosity defect in the casting, the casting is more compact,
copper content is lower than in the prior art because the high copper content makes the pearlite content of the present embodiment too high during production, resulting in an elongation of less than 10%;
the interlayer spacing of pearlite sheets and graphite nodules in a matrix structure can be thinned, so that the QT600-10 performance requirement is met, and the casting performance is stable.
And the matrix is a mixed matrix of pearlite and ferrite, and the casting with the silicon content less than 3.0% has no low-temperature brittleness phenomenon.
The embodiment is a novel lifting ring, the performance of the casting reaches that the tensile strength is more than or equal to 600Mpa, the yield strength is more than or equal to 400Mpa, the elongation is more than or equal to 10, and further the casting is replaced by a steel casting to realize the light weight of the casting.
An eleventh embodiment, the present embodiment is a specific embodiment based on a QT600-10 suspension ring production method as described above, specifically:
a production method for producing QT600-10 lifting ring castings by shell type technology comprises the following steps:
the final chemical components are as follows: 3.6-3.9%, si:2.7-3.0%, mn less than or equal to 0.3, cu: 0.27+/-0.025 percent, sn less than or equal to 0.01 percent, P less than or equal to 0.04 percent, and S less than or equal to 0.03 percent; mg0.03-0.06% and the steps are as follows
The first step: firstly, corresponding shell type is manufactured by using precoated sand, and the precoated sand has the following properties: tensile strength at room temperature: not less than 3.5Mpa, and normal temperature bending strength: not less than 7.0Mpa, gas generation amount: less than or equal to 18ml/g, melting point: 94-110 ℃, raw sand granularity: 100/200 meshes, the sintering temperature of the shell is 220+/-10, the shell baking time is 30-50S, and the thickness of the shell is 6-10mm;
and a second step of: the shell is placed in the sand box, cast iron pellets are filled around the shell and fixed, and the granularity of the cast iron pellets is as follows: phi 2.5mm, the temperature of cast iron pellets with the hardness of 45-65HRC is less than or equal to 80 ℃;
and a third step of: smelting molten iron: adopting an intermediate frequency furnace induction furnace for smelting, adopting packaging scrap steel and returning furnace burden, and adopting the following materials in percentage by mass: 70% -80% of scrap steel, 20-30% of return furnace material, and the components of molten iron before spheroidizing:
C:3.8-3.9％，Si：1.2-1.3％，Mn≤0.3，Cu：0.27±0.025％，Sn≤0.01％，P≤0.04％，S≤0.03％；
fourth step: spheroidizing, wherein the spheroidizing method is wire feeding spheroidizing, and the core-spun yarns are spheroidized by phi 13, and the components are as follows: 28-30% of Mg, 2.5-4.5% of Re, 2.0-3.0% of Ca, 39-44% of Si, 12+ -1.5 m of wire feeding length, 20+ -0.5 m of wire feeding speed and 1490-1540 ℃ of spheroidizing temperature;
fifth step: inoculation: adopting a three-time inoculation mode, inoculating for the first time, selecting 75SiFe with the thickness of 5-10mm, and placing the 75SiFe at the bottom of the ladle, wherein the addition amount of the 75SiFe is 0.8-1.0% of the water yield; the second inoculation is ladle inoculation, 75SiFe with the thickness of 3-5mm is placed at the bottom of a casting ladle, and the addition amount is 1.0% -1.2% of the water yield; the third inoculation is stream inoculation, and 0.2-0.7mm of BI-containing stream inoculant is selected, wherein the addition amount of the BI-containing stream inoculant is 0.15% of the casting water amount. The casting temperature is 1400-1440 ℃.
Casting final components: 3.6-3.9%, si:2.7-3.0%, mn less than or equal to 0.3, cu: 0.27+/-0.025 percent, sn less than or equal to 0.01 percent, P less than or equal to 0.04 percent, and S less than or equal to 0.03 percent; mg0.03-0.06%
Sixth step: and (5) carrying out shakeout treatment after 2 hours of pouring, and taking out the casting.
Embodiment twelve, this embodiment is an example of a production method for producing QT600-10 suspension ring castings based on the shell-type process described in embodiment eleven, specifically:
the invention provides a method for producing QT600-10 lifting ring castings by shell-type technology, which comprises the following specific steps of
S1, preparing a shell: the precoated sand is used for manufacturing corresponding shells, the sintering temperature of the shells is 220 ℃, the shell baking time is 50S, and the thickness of the shells is 10mm;
s2, smelting molten iron: the medium frequency induction furnace is used for smelting iron liquid, and the furnace burden adopts 70% of packed car body scrap steel and 30% of return material, and the ratio of the components in front of the molten iron furnace is as follows: c3.8%, si:1.3%, mn 0.3%, cu:0.26%, sn0.003%, P:0.018%, S:0.006%
S3, spheroidizing: the spheroidizing method comprises the steps of feeding wires for spheroidizing, wherein the phi 13 spheroidized cored wires are selected as the cored wires, and the components are as follows: 28-30% of Mg, 2.5-4.5% of Re, 2.0-3.0% of Ca, 39-44% of Si, 12.5m of wire feeding length, 20m/min of wire feeding speed and 1500 ℃ of spheroidizing temperature;
s4, inoculation: adopting a three-time inoculation mode, inoculating for the first time, selecting 75SiFe with the thickness of 5-10mm, and placing the mixture at the bottom of a ladle, wherein the adding amount of 360Kg of water yield is 3.24 Kg; the second inoculation is ladle inoculation, 75SiFe with the thickness of 3-5mm is placed at the bottom of a casting ladle, and the addition amount is 3.96Kg of water yield; the third inoculation is stream inoculation, and 0.2-0.7mm of BI-containing stream inoculant is selected, wherein the addition amount of the BI-containing stream inoculant is 0.15% of the casting water amount. The casting temperature was 1407 ℃. Casting final components: c3.8%, si:3.0%, mn 0.3%, cu:0.26%, sn0.003%, P:0.019%, S:0.006%
Mg：0.052％
S5, carrying out shakeout treatment after 2 hours after pouring, and taking out the casting
S6, cutting the body to obtain a tensile test bar. The metallographic structure and the performance of the test bar are shown in the following figures 1-3:
fig. 1 is graphite: spheroidization rate 2, sphere diameter size 8, 100X;
fig. 2 shows a substrate: 45% pearlite + ferrite, 100X;
FIG. 3 is a lamellar structure of pearlitic fine flakes, 1000X;
table 1 body Performance statistics table
The picture and the number of the upper graph are the same body test bar detection result, and the body performance is the final aim achieved by the invention.
By adopting the production process, the method can finally realize:
as can be seen from FIG. 1, the spheroidization rate of the casting body is 2 levels, the sphere diameter is 8 levels, the excellent spheroidization effect is achieved, the splitting effect of graphite on the matrix is reduced, and the tensile strength of the casting is improved
As can be seen from fig. 2, 3 and table 1, the casting matrix is 45% pearlite+ferrite, 45% lamellar pearlite+ferrite can ensure that the strength of the casting reaches more than 600Mpa, and the elongation is ensured to be more than 10.
It should be appreciated that in the description herein, reference to the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A method for producing QT600-10 suspension loops, said method comprising:
step 1, manufacturing a shell mold by using precoated sand;
step 2, placing the shell in a sand box, and filling cast iron pellets around the shell for fixation;
step 3, molten iron smelting, specifically comprising:
adopting an intermediate frequency furnace induction furnace for smelting, and carrying out spheroidizing treatment on the molten iron components:
C:3.8-3.9％，Si：1.2-1.3％，Mn≤0.3，Cu：0.27±0.025％，Sn≤0.01％，P≤0.04％，S≤0.03％；
step 4, spheroidizing, specifically comprising:
the spheroidizing method comprises the steps of wire feeding and spheroidizing, and cored wire components: 28-30% of Mg, 2.5-4.5% of Re, 2.0-3.0% of Ca, 39-44% of Si, 12+ -1.5 m of wire feeding length, 20+ -0.5 m/min of wire feeding speed and 1490-1540 ℃ of spheroidizing temperature;
step 5, inoculation treatment, which specifically comprises:
adopting a three-time inoculation mode, inoculating for the first time, selecting 75SiFe with the thickness of 5-10mm, and placing the 75SiFe at the bottom of a pouring ladle, wherein the addition amount of the 75SiFe is 0.8-1.0% of the water yield; the second inoculation is ladle inoculation, 75SiFe with the thickness of 3-5mm is placed at the bottom of a casting ladle, and the addition amount is 1.0% -1.2% of the water yield; the third inoculation is stream inoculation, 0.2-0.7mm of BI-containing stream inoculant is selected, the addition amount is 0.15% of the casting water amount, and the casting temperature is 1400-1440 ℃;
casting final components: 3.6-3.9%, si:2.7-3.0%, mn less than or equal to 0.3, cu: 0.27+/-0.025 percent, sn is less than or equal to 0.01 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.03 percent, and Mg is 0.03-0.06 percent;
and 6, carrying out shakeout treatment after pouring, and taking out the casting.
2. The method for producing QT600-10 suspension ring of claim 1, wherein said precoated sand performance comprises:
the normal temperature tensile strength is more than or equal to 3.5Mpa, the normal temperature bending strength is more than or equal to 7.0Mpa, the gas generation rate is less than or equal to 18ml/g, the melting point is 94-110 ℃, the granularity of raw sand is 100/200 meshes, the sintering temperature of the shell is 220+/-10 ℃, the shell baking time is 30-50S, and the thickness of the shell is 6-10mm.
3. The method for producing the QT600-10 hanging ring according to claim 1 is characterized in that the grain size phi of cast iron pellets is 2.5mm, the hardness is 45-65HRC, and the temperature of the cast iron pellets is less than or equal to 80 ℃.
4. The method for producing QT600-10 suspension rings of claim 1, wherein in step 3, the burden for molten iron smelting adopts packaging scrap and return burden, and comprises the following components in mass percent: 70-80% of scrap steel and 20-30% of return furnace material.
5. The method for producing QT600-10 suspension ring of claim 1, wherein said core-spun yarn is a phi 13 spheroidized core-spun yarn.
6. A method of producing QT600-10 suspension loop of claim 2 wherein said shell thickness is 10mm.
7. The method for producing QT600-10 suspension ring of claim 1, wherein said pre-spheroidizing molten iron composition: c3.8%, si:1.3%, mn 0.3%, cu:0.26%, sn0.003%, P:0.018%, S:0.006%.
8. The method of producing QT600-10 suspension ring of claim 1 wherein said casting finish composition: c3.8%, si:3.0%, mn 0.3%, cu:0.26%, sn0.003%, P:0.019%, S:0.006%.
9. The method for producing QT600-10 suspension ring of claim 1, wherein step 6, in particular, comprises:
and (5) carrying out shakeout treatment after 2 hours of pouring, and taking out the casting.
10. QT600-10 suspension ring, characterized in that it is manufactured by the manufacturing method according to any of the claims 1-9.
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| WO2013051698A1 (en) * | 2011-10-07 | 2013-04-11 | 曙ブレーキ工業株式会社 | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
| CN105861917A (en) * | 2016-04-14 | 2016-08-17 | 东风精密铸造有限公司 | Production method for as-cast high-performance ductile iron QT600-10 by precision-investment casting |
| CN106244911A (en) * | 2016-08-30 | 2016-12-21 | 河南广瑞汽车部件股份有限公司 | Automobile steering device housing solution strengthening ferrite ductile cast iron and production method thereof |
| CN111020357A (en) * | 2019-11-22 | 2020-04-17 | 湖北省丹江口丹传汽车传动轴有限公司 | Production method for batch production of stable pearlite nodular cast iron QT500-7 |
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- 2023-04-25 CN CN202310454554.8A patent/CN116479317A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013051698A1 (en) * | 2011-10-07 | 2013-04-11 | 曙ブレーキ工業株式会社 | Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron |
| CN105861917A (en) * | 2016-04-14 | 2016-08-17 | 东风精密铸造有限公司 | Production method for as-cast high-performance ductile iron QT600-10 by precision-investment casting |
| CN106244911A (en) * | 2016-08-30 | 2016-12-21 | 河南广瑞汽车部件股份有限公司 | Automobile steering device housing solution strengthening ferrite ductile cast iron and production method thereof |
| CN111020357A (en) * | 2019-11-22 | 2020-04-17 | 湖北省丹江口丹传汽车传动轴有限公司 | Production method for batch production of stable pearlite nodular cast iron QT500-7 |
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