CN114990422A - Nodular cast iron oil cylinder body and preparation process thereof - Google Patents
Nodular cast iron oil cylinder body and preparation process thereof Download PDFInfo
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- CN114990422A CN114990422A CN202210754345.0A CN202210754345A CN114990422A CN 114990422 A CN114990422 A CN 114990422A CN 202210754345 A CN202210754345 A CN 202210754345A CN 114990422 A CN114990422 A CN 114990422A
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- oil cylinder
- cast iron
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- cylinder body
- spheroidizing agent
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 239000011777 magnesium Substances 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 claims description 6
- 239000002054 inoculum Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical group [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention belongs to the field of nodular cast iron, and discloses a nodular cast iron oil cylinder body which comprises the following components in percentage by weight: c: 3.4-3.5, Si: 1.70-1.90, Mn: 0.2-0.3, Cu: 0.05-0.08, Ni: 0.1-0.2; RE: 0.004-0.01, Mg: 0.02-0.06 and balance iron and non-removable impurities. The specification of the oil cylinder body is R700mm, and the elongation is 17%; the hardness is about 170; the tensile strength Rm needs to reach 450MPa, and after the return visit, the situations of oil leakage of the oil cylinder and micro-cracks on the metal surface are not shown after the client continuously uses the oil cylinder for 4 years.
Description
Technical Field
The invention relates to the field of nodular cast iron, in particular to a nodular cast iron oil cylinder body and a preparation process thereof.
Background
The specification of the oil cylinder made of nodular cast iron required by customers of the company is R700mm, and the elongation is 17%; the hardness is about 170; the tensile strength Rm needs to reach 450 MPa.
The oil cylinder with the volume not too large has the greatest use limitation that the operation frequency is high, and the metal fatigue, the elongation, the hardness and the tensile strength are unified and have great difficulty.
Therefore, the technical problem that the present scheme was solved is: on the premise of meeting the requirement of the basic performance of the oil cylinder, the service life of the small-size oil cylinder is prolonged.
Disclosure of Invention
The invention aims to provide a nodular cast iron oil cylinder body, which has the specification of R700mm and the elongation of 17 percent; the hardness is about 170; the tensile strength Rm needs to reach 450MPa, and after the return visit, the situations of oil leakage of the oil cylinder and micro-cracks on the metal surface are not shown after the client continuously uses the oil cylinder for 4 years.
Meanwhile, the invention also provides a preparation process of the oil cylinder body.
The technical scheme provided by the invention is as follows: the nodular cast iron oil cylinder body comprises the following components in percentage by weight:
c: 3.4-3.5, Si: 1.70-1.90, Mn: 0.2-0.3, Cu: 0.05-0.08, Ni: 0.1-0.2; RE: 0.004-0.01, Mg: 0.02-0.06 and balance iron and non-removable impurities.
In the nodular cast iron oil cylinder body, the components of the nodular cast iron oil cylinder body are as follows by weight percent:
c: 3.43-3.47, Si: 1.75-1.85, Mn: 0.22-0.27, Cu: 0.06-0.07, Ni: 0.12-0.16; RE: 0.006-0.008, Mg: 0.03-0.05 and balance iron and non-removable impurities.
Meanwhile, the invention also provides a preparation process of the nodular cast iron oil cylinder body, which comprises the following steps:
step 1: smelting iron and ferrosilicon at 1380-1400 ℃;
step 2: adding manganese, copper, nickel and a carburant into the step 1;
and step 3: heating the molten iron in the step 2 to 1440-1450 ℃, pouring the molten iron into a ladle to pull out slag, and then performing liquid outlet spheroidization treatment, wherein the spheroidizing agent is yttrium-based heavy rare earth composite spheroidizing agent soil and light rare earth magnesium composite spheroidizing agent, the weight ratio of the yttrium-based heavy rare earth composite spheroidizing agent soil to the light rare earth magnesium composite spheroidizing agent is 7-8: 3-2, and the using amount of the spheroidizing agent is 0.8-1.0 wt% of the total amount of the raw materials in the step 1;
and 4, step 4: pouring, during which, a sulfur-oxygen inoculant is added along with the flow, and the dosage of the sulfur-oxygen inoculant is 0.06-0.08 percent of the total amount of the raw materials in the step 1.
In the preparation process of the nodular cast iron oil cylinder body, the diameter of a sprue of the poured sand mold is controlled to be 75mm, the cross section of a horizontal runner is trapezoidal, the upper side is 60mm, the lower side is 70mm and the height is 75mm, the cross section of an ingate is flat and also trapezoidal, the upper side is 60mm, the lower side is 65mm and the height is 10 mm. The sprue, the cross gate and the ingate are connected in sequence.
In the preparation process of the nodular cast iron oil cylinder body, in the step 3, the slagging-off temperature is 1480-1520 ℃, and the standing is carried out for 3-6 min.
In the above process for preparing the nodular cast iron oil cylinder body, the oil cylinder body needs to be subjected to heat treatment after the step 4, and the heat treatment operation is as follows:
heating to 600-650 ℃ at the speed of 40-60 ℃/h, and preserving heat for 3-5 h;
heating to 800-900 ℃ at the speed of 60-80 ℃/h, and preserving heat for 3-5 h;
naturally cooling to the temperature of 700 ℃ plus 740 ℃, tempering and preserving heat for 2-3 h.
After the technical scheme is adopted, the invention has the beneficial effects that:
the specification of the oil cylinder body is R700mm, and the elongation is 17%; the hardness is about 170; the tensile strength Rm needs to reach 450MPa, and the service life is at least 4 years.
Drawings
FIG. 1 is a front view of a sand mold according to example 1 of the present invention;
FIG. 2 is a top view of a sand mold according to example 1 of the present invention;
FIGS. 3 to 5 are sectional views A-A, B-B, C-C of example 1 of the present invention;
fig. 6 is a metallographic image of a cylinder block according to example 6 of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto.
Example 1:
a preparation process of a nodular cast iron oil cylinder body comprises the following steps:
step 1: smelting iron and ferrosilicon at 1380-1400 ℃;
and 2, step: adding manganese, copper, nickel and a carburant into the step 1;
and step 3: heating the molten iron in the step 2 to 1440-plus 1450 ℃, pouring the molten iron into a ladle to pull out slag, keeping the slag-off temperature at 1480-plus 1520 ℃, standing for 4min, and performing liquid spheroidization, wherein the spheroidizing agent is yttrium-based heavy rare earth composite spheroidizing agent soil and light rare earth magnesium composite spheroidizing agent, the weight ratio of the yttrium-based heavy rare earth composite spheroidizing agent soil to the light rare earth magnesium composite spheroidizing agent is 7-8: 3-2, and the using amount of the spheroidizing agent is 0.8-1.0 wt% of the total amount of the raw materials in the step 1;
and 4, step 4: pouring, during which, a sulfur-oxygen inoculant is added along with the flow, and the dosage of the sulfur-oxygen inoculant is 0.06-0.08 percent of the total amount of the raw materials in the step 1.
The pouring sand mold structure is shown in figures 1-5, the diameter of a sprue of the poured sand mold is controlled to be 75mm, the cross section of a horizontal runner is trapezoidal, the upper side of the horizontal runner is 60mm, the lower side of the horizontal runner is 70mm, the height of the horizontal runner is 75mm, the cross section of an inner runner is flat and also trapezoidal, and the upper side of the inner runner is 60mm, the lower side of the inner runner is 65mm, and the height of the inner runner is 10 mm. The straight pouring channel, the cross pouring channel and the inner pouring channel are connected in sequence;
through detection, the components of each substance are as follows: c: 3.45, Si: 1.80, Mn: 0.25, Cu: 0.07, Ni: 0.15; RE: 0.006, Mg: 0.04 and balance iron and non-removable impurities; sample A was obtained.
Examples 2 to 4
The preparation process is as in example 1, and the formulation is as in table 1 below:
TABLE 1
| C | Si | Mn | Cu | Ni | RE | Mg | |
| Example 2 sample B | 3.4 | 1.9 | 0.2 | 0.08 | 0.1 | 0.006 | 0.06 |
| Example 3 sample C | 3.5 | 1.7 | 0.3 | 0.05 | 0.2 | 0.007 | 0.02 |
| Example 4 | 3.43 | 1.75 | 0.28 | 0.07 | 0.13 | 0.008 | 0.03 |
| Example 5 | 3.48 | 1.85 | 0.23 | 0.06 | 0.18 | 0.005 | 0.04 |
Example 6
Carrying out post-treatment on the sample A, wherein the post-treatment method comprises the following steps:
heating to 600-650 ℃ at the speed of 50 ℃/h, and preserving heat for 4 h;
heating to 850-;
naturally cooling to 700 ℃ plus 740 ℃, tempering, and preserving heat for 3h to obtain a sample A1.
Example 7
And (3) carrying out post-treatment on the sample B, wherein the post-treatment method comprises the following steps:
heating to 600-650 ℃ at the speed of 40 ℃/h, and preserving heat for 4 h;
heating to 850-;
naturally cooling to 700 ℃ and 740 ℃, tempering, and preserving heat for 3h to obtain a sample B1.
Example 8
And (3) carrying out post-treatment on the sample C, wherein the post-treatment method comprises the following steps:
heating to 600-650 ℃ at the speed of 60 ℃/h, and preserving heat for 5 h;
heating to 850-;
naturally cooling to the temperature of 700 ℃ and 740 ℃, tempering, and preserving heat for 2h to obtain a sample C1.
Comparative example 1
The same as example 1, except that Ni was removed from the formulation, the composition of each material was determined to be: c: 3.46, Si: 1.82, Mn: 0.24, Cu: 0.07, RE: 0.007, Mg: 0.04 and balance iron and non-removable impurities, sample D was obtained.
Comparative example 2
Substantially the same as example 1, except that the formulation was tested to remove Cu, C: 3.45, Si: 1.81, Mn: 0.26, Ni: 0.16; RE: 0.006, Mg: 0.04 and balance iron and non-removable impurities, sample E was obtained.
Performance testing
The relevant performance tests were performed for samples A, D, E and A1-C1, with the test results shown in Table 2 below:
TABLE 2
| Elongation percentage% | Hardness (HBW) | Tensile strength MPa | Service life | |
| Sample A | 17.5 | 163 | 480 | More than 4 years |
| Sample D | 11.2 | 159 | 450 | 26 months old |
| Sample E | 12.1 | 141 | 472 | 31 months old |
| Sample A1 | 18.7 | 185 | 514 | More than 4 years |
| Sample B1 | 17.2 | 179 | 494 | More than 4 years |
| Sample C1 | 17.1 | 188 | 485 | More than 4 years |
Referring to fig. 6, fig. 6 is the metallographic phase of example 1, 100 x.
The spheroidization in fig. 2 is classified into grade 2, the spheroidization rate is 90.5%, the pearlite content is 16.89%, the ferrite content is 67.78%, the number of graphite nodules is 302 per square millimeter, and the average particle size is 0.0208 mm.
Through the test, the addition of Cu and Ni can be found to have a positive effect on the service life of the oil cylinder.
The later heat treatment can improve the elongation, hardness and tensile strength of the product.
Claims (5)
1. The utility model provides a nodular cast iron oil cylinder body which characterized in that: the components of the material are as follows by weight percent:
c: 3.4-3.5, Si: 1.70-1.90, Mn: 0.2-0.3, Cu: 0.05-0.08, Ni: 0.1-0.2; RE: 0.004-0.01, Mg: 0.02-0.06 and balance iron and non-removable impurities.
2. The nodular cast iron cylinder block of claim 1, wherein: the components of the material are as follows by weight percent:
c: 3.43-3.47, Si: 1.75-1.85, Mn: 0.22-0.27, Cu: 0.06-0.07, Ni: 0.12-0.16; RE: 0.006-0.008, Mg: 0.03-0.05 and balance iron and non-removable impurities.
3. The process for preparing the spheroidal graphite cast iron oil cylinder body according to claim 1 or 2, characterized by comprising the following steps:
step 1: smelting iron and ferrosilicon at 1380-1400 ℃;
step 2: adding manganese, copper, nickel and a carburant into the step 1;
and step 3: heating the molten iron in the step 2 to 1440-1450 ℃, pouring the molten iron into a ladle to pull out slag, and then performing liquid outlet spheroidization treatment, wherein the spheroidizing agent is yttrium-based heavy rare earth composite spheroidizing agent soil and light rare earth magnesium composite spheroidizing agent, the weight ratio of the yttrium-based heavy rare earth composite spheroidizing agent soil to the light rare earth magnesium composite spheroidizing agent is 7-8: 3-2, and the using amount of the spheroidizing agent is 0.8-1.0 wt% of the total amount of the raw materials in the step 1;
and 4, step 4: and (3) pouring, wherein during pouring, a sulfur-oxygen inoculant is added along with the flow, and the dosage of the sulfur-oxygen inoculant is 0.06-0.08 percent of the total amount of the raw materials in the step (1).
4. The preparation process of the nodular cast iron oil cylinder body as claimed in claim 3, wherein in the step 3, the slag skimming temperature is 1480-1520 ℃, and the standing is 3-6 min.
5. The process for preparing the nodular cast iron oil cylinder block according to claim 3, wherein the oil cylinder block is further subjected to heat treatment after the step 4, and the heat treatment is carried out by the following operation:
heating to 600-650 ℃ at the speed of 40-60 ℃/h, and preserving heat for 3-5 h;
heating to 800-;
naturally cooling to the temperature of 700 ℃ plus 740 ℃, tempering and preserving heat for 2-3 h.
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| CN202210754345.0A CN114990422A (en) | 2022-06-28 | 2022-06-28 | Nodular cast iron oil cylinder body and preparation process thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349869A (en) * | 2000-10-20 | 2002-05-22 | 衣铁鑫 | Casting process and special equipment of manufacturing wear resisting cylinder jacket of tubular oil pump |
| CN104775067A (en) * | 2015-04-01 | 2015-07-15 | 北京纵横机电技术开发公司 | Alloy nodular cast iron for railway vehicle brake disks |
| CN107739971A (en) * | 2017-10-23 | 2018-02-27 | 广东现代铸造有限公司 | A kind of spheroidal graphite cast-iron and with cylinder body tailgate |
| CN108642371A (en) * | 2018-05-25 | 2018-10-12 | 成都航空职业技术学院 | A kind of hot-forming Oil cylinder and preparation method thereof |
| CN111349843A (en) * | 2020-04-14 | 2020-06-30 | 常州凯达重工科技有限公司 | High-strength alloy nodular cast iron roughing roll and production process thereof |
-
2022
- 2022-06-28 CN CN202210754345.0A patent/CN114990422A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349869A (en) * | 2000-10-20 | 2002-05-22 | 衣铁鑫 | Casting process and special equipment of manufacturing wear resisting cylinder jacket of tubular oil pump |
| CN104775067A (en) * | 2015-04-01 | 2015-07-15 | 北京纵横机电技术开发公司 | Alloy nodular cast iron for railway vehicle brake disks |
| CN107739971A (en) * | 2017-10-23 | 2018-02-27 | 广东现代铸造有限公司 | A kind of spheroidal graphite cast-iron and with cylinder body tailgate |
| CN108642371A (en) * | 2018-05-25 | 2018-10-12 | 成都航空职业技术学院 | A kind of hot-forming Oil cylinder and preparation method thereof |
| CN111349843A (en) * | 2020-04-14 | 2020-06-30 | 常州凯达重工科技有限公司 | High-strength alloy nodular cast iron roughing roll and production process thereof |
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Application publication date: 20220902 |