CN114178802A - Manufacturing method of large axle wedge cross rolling die - Google Patents
Manufacturing method of large axle wedge cross rolling die Download PDFInfo
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- CN114178802A CN114178802A CN202111369004.3A CN202111369004A CN114178802A CN 114178802 A CN114178802 A CN 114178802A CN 202111369004 A CN202111369004 A CN 202111369004A CN 114178802 A CN114178802 A CN 114178802A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 8
- 238000004080 punching Methods 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000005242 forging Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 102220005308 rs33960931 Human genes 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 2
- 238000009750 centrifugal casting Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a manufacturing method of a large axle cross wedge rolling die, which comprises the following steps: blanking: cutting and blanking by using a hot-rolled die steel plate as a raw material; bending: heating the steel plate to 1150-1250 ℃ and then bending the steel plate into an arc-shaped plate; and (3) cooling: slowly cooling the arc-shaped plate to room temperature in air; and (3) heat treatment: quenching and tempering heat treatment is carried out on the arc-shaped plate, the quenching temperature is controlled to be 830-850 ℃, the quenching medium is oil, the tempering temperature is controlled to be 500-650 ℃, and the surface hardness of the arc-shaped plate after heat treatment is controlled to be 310-360 HB; ultrasonic flaw detection: carrying out ultrasonic nondestructive inspection on the arc-shaped plate; three-side processing: machining three matching surfaces of the arc-shaped plate; punching: processing a positioning hole on the arc-shaped plate; assembling and processing the outer circular surface: a plurality of arc plates are assembled on the mandrel piece by piece, and a wedge shape is processed on the outer circular surface. The method of the invention adopts a thick plate split bending, splicing and forming mode, and solves the problems of scarcity and high cost of large-scale cross wedge rolling die centrifugal casting equipment.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a manufacturing method of a wedge cross rolling die for a large axle.
Background
Large axles, such as railway axles, are typically larger than 1700mm in diameter and are currently substantially formed by casting. In order to improve the processing efficiency and material utilization rate of the axle, a composite forming process of fast forging and cross wedge rolling has been tried to manufacture and process a large-sized axle recently. In order to realize the composite forming process of the rapid forging and cross wedge rolling, the manufacturing of a large axle cross wedge rolling die becomes a key technology and a manufacturing problem. In the prior art, a circular mold is adopted for centrifugally casting to form the cross wedge rolling mold, but the centrifugal casting process is suitable for manufacturing small cross wedge rolling molds, is used for manufacturing large axle cross wedge rolling molds, has the problem of limited manufacturing equipment, and greatly increases the cost.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a manufacturing method of a large axle cross wedge rolling die, which comprises the following process steps:
blanking: cutting and blanking by using a hot-rolled die steel plate as a raw material;
bending: heating the steel plate to 1150-1250 ℃, bending the steel plate into an arc-shaped plate, and controlling the pressure maintaining time to be more than or equal to 20 s;
and (3) cooling: slowly cooling the arc-shaped plate to room temperature in air;
and (3) heat treatment: quenching and tempering heat treatment is carried out on the arc-shaped plate, the quenching temperature is controlled to be 830-850 ℃, the quenching medium is oil, the tempering temperature is controlled to be 500-650 ℃, and the surface hardness of the arc-shaped plate after heat treatment is controlled to be 310-360 HB;
ultrasonic flaw detection: carrying out ultrasonic nondestructive inspection on the arc-shaped plate;
three-side processing: machining three matching surfaces of the arc-shaped plate, wherein the three matching surfaces comprise an inner concave surface and two side end surfaces of the arc-shaped plate;
punching: processing a positioning hole on the arc-shaped plate;
assembling and processing the outer circular surface: assembling a plurality of arc plates on the mandrel piece by piece to form an assembly part, and then processing the outer circular surface of the assembly part into a wedge shape.
Further, in the manufacturing method of the large axle cross wedge rolling die, the adopted hot rolling die steel plate raw material comprises the following chemical components in percentage by mass: 0.52 to 0.57%, Si: 0.17 to 0.37%, Mn: 0.9-1.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, Ni is less than or equal to 0.3%, Cr is less than or equal to 0.25%, Cu is less than or equal to 0.25%, and the gas content is controlled to be less than 2.5ppm and less than or equal to 25 ppm.
Further, in the manufacturing method of the large axle cross wedge rolling die, in the blanking step, cutting blanking is performed through flame cutting or plasma cutting, and the cutting size is determined according to the design requirements of the finished large axle cross wedge rolling die.
Further, in the manufacturing method of the large axle wedge cross rolling die, in the bending step, closed die forging is adopted to bend the steel plate into an arc-shaped plate.
Further, in the above-described method for manufacturing a large-sized axle cross wedge rolling die, in the heat treatment step, blow cooling or water cooling is prohibited.
Further, in the manufacturing method of the large axle cross wedge rolling die, in the three-surface machining step, three mating surfaces of the arc plate are machined by using five or more machining centers.
Further, in the manufacturing method of the wedge rolling die for the large axle, in the assembling and outer circular surface processing steps, a horizontal lathe or a gantry processing center is adopted to process the outer circular surface of the assembly part into a wedge shape.
Preferably, in the method for manufacturing a large-sized axle cross wedge rolling die, the method further comprises:
in the blanking step, the grade of the adopted hot-rolled die steel plate raw material is S50C, and the thickness is selected to be 130 mm;
in the bending step, the steel plate is bent into an arc plate with the inner diameter of 1500 mm;
in the punching processing step, the positioning hole is a stepped hole, the diameter of the stepped hole close to the outer convex surface is 40mm, the depth of the stepped hole is 90mm, the diameter of the stepped hole close to the inner concave surface is 27mm, and the depth of the stepped hole is 40 mm;
in the assembling and outer circular surface processing steps, 8 arc-shaped plates are assembled on a mandrel piece by piece, and then a wedge is processed on the outer circular surface to obtain a large axle wedge transverse rolling die finished product with the diameter of 1760 mm.
The manufacturing method of the large axle wedge cross rolling die has the following advantages and beneficial effects: 1. the thick plate split bending assembly forming mode is adopted to replace the existing annular mold centrifugal casting forming, the limitation of manufacturing equipment of the large axle cross wedge rolling mold is broken through, and the problems of scarcity and high cost of the large cross wedge rolling mold centrifugal casting equipment are solved. 2. The modularized split manufacturing method reduces the processing cost and improves the production efficiency because the wire cutting and splitting are not needed. 3. The hot rolling die steel plate material is used for replacing a casting die material, and the service life of the large axle wedge cross rolling die is prolonged due to the improvement of the tissue compactness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic process flow diagram of the manufacturing method of the large axle cross wedge rolling die of the present invention;
fig. 2 is a schematic view of the assembled state in the assembling and outer circular surface processing steps in the manufacturing method of the large axle cross wedge rolling die of the present invention;
fig. 3 is a schematic structural view of a large-sized axle cross wedge rolling die manufactured by the method for manufacturing a large-sized axle cross wedge rolling die according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the manufacturing method of the large axle cross wedge rolling die of the invention comprises the following process steps:
blanking: the hot-rolled die steel plate is used as a raw material, blanking is cut in modes of flame cutting or plasma cutting and the like, and the cutting size is determined according to the design requirements of a large axle wedge cross rolling die finished product.
Bending: heating the steel plate to 1150-1250 ℃, and bending the steel plate into an arc-shaped plate by closed die forging, wherein the pressure maintaining time is controlled to be more than or equal to 20 s.
And (3) cooling: the arc plate is slowly cooled to room temperature in air, and blowing or water cooling is forbidden.
And (3) heat treatment: cooling the arc plate to room temperature, and then carrying out quenching and tempering heat treatment, wherein the quenching temperature is controlled to be 830-850 ℃, the quenching medium is oil, the tempering temperature is controlled to be 500-650 ℃, and the surface hardness of the arc plate after heat treatment is controlled to be 310-360 HB.
Ultrasonic flaw detection: ultrasonic nondestructive inspection is carried out on the arc-shaped plate according to the nondestructive inspection requirement of the forged steel piece of JB-T5000.15 (part 15 of the general technical condition of heavy machinery), and the requirement of grade III grade quality in JB-T5000.15 is required to be met.
Three-side processing: machining three matching surfaces of the arc-shaped plate by adopting five shafts and more than five machining centers, wherein the three matching surfaces comprise an inner concave surface and two side end surfaces of the arc-shaped plate, the inner concave surface is matched with the mandrel, and the side end surfaces are matched with the side end surfaces of other arc-shaped plates.
Punching: and processing a positioning hole on the arc-shaped plate so as to be beneficial to assembling the arc-shaped plate on the mandrel.
Assembling and processing the outer circular surface: assembling a plurality of arc-shaped plates processed according to the steps on the mandrel piece by piece to form an assembly part, and then processing the outer circular surface of the assembly part into a wedge shape by adopting a horizontal lathe or a gantry processing center.
The finished structure of the large axle cross wedge rolling die manufactured by the manufacturing method of the large axle cross wedge rolling die is shown in fig. 3.
Preferably, in the method for manufacturing the large axle cross wedge rolling die, the chemical components of the adopted hot rolling die steel plate raw material are controlled as follows by mass percent: 0.52 to 0.57%, Si: 0.17 to 0.37%, Mn: 0.9-1.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, Ni is less than or equal to 0.3%, Cr is less than or equal to 0.25%, Cu is less than or equal to 0.25%, and the ppm concentration (concentration per million) of gas content is controlled to be less than 2.5ppm and less than or equal to 25 ppm.
Example 1
The manufacturing method of the large axle cross wedge rolling die in the embodiment 1 comprises the following steps of taking a hot rolling die steel plate with the mark of S50C as a raw material, wherein the diameter of a finished product of the large axle cross wedge rolling die is required to be 1760mm, and referring to fig. 1 and fig. 2:
in the blanking step, the thickness of the hot-rolled die steel sheet as a raw material was selected to be 130 mm.
In the press bending step, the steel plate is press-bent to have an inner diameter of
The arc plate.
In the punching processing step, a positioning hole is processed on the arc-shaped plate, the positioning hole is a stepped hole, the diameter D of the stepped hole close to the outer convex surface is 40mm, the hole depth H is 90mm, the diameter D of the stepped hole close to the inner concave surface is 27mm, and the hole depth H is 40 mm.
In the assembling and outer circular surface processing steps, 8 arc-shaped plates are assembled on a mandrel piece by piece, and then a wedge shape is processed on the outer circular surface, so that a large axle wedge transverse rolling die finished product with the diameter phi of 1760mm is obtained.
In summary, compared with the prior art, the manufacturing method of the wedge cross rolling die for the large axle has the following advantages and beneficial effects:
1. the thick plate split bending assembly forming mode is adopted to replace the existing annular mold centrifugal casting forming, the limitation of manufacturing equipment of the large axle cross wedge rolling mold is broken through, and the problems of scarcity and high cost of the large cross wedge rolling mold centrifugal casting equipment are solved.
2. The modularized split manufacturing method reduces the processing cost and improves the production efficiency because the wire cutting and splitting are not needed.
3. The hot rolling die steel plate material is used for replacing a casting die material, and the service life of the large axle wedge cross rolling die is prolonged due to the improvement of the tissue compactness.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (8)
1. The manufacturing method of the large axle wedge cross rolling die is characterized by comprising the following process steps:
blanking: cutting and blanking by using a hot-rolled die steel plate as a raw material;
bending: heating the steel plate to 1150-1250 ℃, bending the steel plate into an arc-shaped plate, and controlling the pressure maintaining time to be more than or equal to 20 s;
and (3) cooling: slowly cooling the arc-shaped plate to room temperature in air;
and (3) heat treatment: quenching and tempering heat treatment is carried out on the arc-shaped plate, the quenching temperature is controlled to be 830-850 ℃, the quenching medium is oil, the tempering temperature is controlled to be 500-650 ℃, and the surface hardness of the arc-shaped plate after heat treatment is controlled to be 310-360 HB;
ultrasonic flaw detection: carrying out ultrasonic nondestructive inspection on the arc-shaped plate;
three-side processing: machining three matching surfaces of the arc-shaped plate, wherein the three matching surfaces comprise an inner concave surface and two side end surfaces of the arc-shaped plate;
punching: processing a positioning hole on the arc-shaped plate;
assembling and processing the outer circular surface: assembling a plurality of arc plates on the mandrel piece by piece to form an assembly part, and then processing the outer circular surface of the assembly part into a wedge shape.
2. The manufacturing method of the large axle cross wedge rolling die as claimed in claim 1, wherein the adopted hot rolling die steel plate raw material comprises the following chemical components in percentage by mass: 0.52 to 0.57%, Si: 0.17 to 0.37%, Mn: 0.9-1.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, Ni is less than or equal to 0.3%, Cr is less than or equal to 0.25%, Cu is less than or equal to 0.25%, and the gas content is controlled to be less than 2.5ppm and less than or equal to 25 ppm.
3. The manufacturing method of the large axle cross wedge rolling die according to claim 1, wherein in the blanking step, cutting blanking is performed by flame cutting or plasma cutting, and the cutting size is determined according to the design requirements of the finished large axle cross wedge rolling die.
4. The method for manufacturing a large axle cross wedge mold according to claim 1, wherein in the step of press bending, closed die forging is used to press bend the steel plate into an arc-shaped plate.
5. The method for manufacturing a large-sized axle cross wedge mold according to claim 1, wherein in the heat treatment step, the blow cooling or the water cooling is prohibited.
6. The manufacturing method of a large-sized axle cross wedge rolling die according to claim 1, wherein in the three-face machining step, three mating faces of the arc plate are machined using five and more than five machining centers.
7. The manufacturing method of the large axle cross wedge rolling die as claimed in claim 1, wherein in the assembling and outer circular surface processing steps, a horizontal lathe or a gantry machining center is used to process a wedge shape on the outer circular surface of the assembly.
8. The manufacturing method of a large-sized axle cross wedge rolling die according to any one of claims 1 to 7, characterized in that:
in the blanking step, the grade of the adopted hot-rolled die steel plate raw material is S50C, and the thickness is selected to be 130 mm;
in the bending step, the steel plate is bent into an arc plate with the inner diameter of 1500 mm;
in the punching processing step, the positioning hole is a stepped hole, the diameter of the stepped hole close to the outer convex surface is 40mm, the depth of the stepped hole is 90mm, the diameter of the stepped hole close to the inner concave surface is 27mm, and the depth of the stepped hole is 40 mm;
in the assembling and outer circular surface processing steps, 8 arc-shaped plates are assembled on a mandrel piece by piece, and then a wedge is processed on the outer circular surface to obtain a large axle wedge transverse rolling die finished product with the diameter of 1760 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369004.3A CN114178802A (en) | 2021-11-18 | 2021-11-18 | Manufacturing method of large axle wedge cross rolling die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369004.3A CN114178802A (en) | 2021-11-18 | 2021-11-18 | Manufacturing method of large axle wedge cross rolling die |
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| CN114178802A true CN114178802A (en) | 2022-03-15 |
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| CN202111369004.3A Pending CN114178802A (en) | 2021-11-18 | 2021-11-18 | Manufacturing method of large axle wedge cross rolling die |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050273A (en) * | 1975-02-19 | 1977-09-27 | Sato Tekko Co., Ltd. | Cross-roll forging machine |
| US4411175A (en) * | 1979-10-18 | 1983-10-25 | Bridgestone Tire Co., Ltd. | Method for making a ring-shaped mold |
| CN2148612Y (en) * | 1992-12-03 | 1993-12-08 | 国营经纬纺织机械厂 | Roller |
| CN101322979A (en) * | 2008-08-05 | 2008-12-17 | 方崇实 | Assembly roller |
| CN101850366A (en) * | 2010-05-18 | 2010-10-06 | 柳州市半轴汽车配件有限责任公司 | Cross wedge rolling die |
| CN102489681A (en) * | 2011-12-29 | 2012-06-13 | 河北津西钢铁集团大方重工科技有限公司 | Centrifugally cast cross-wedge rolling die and manufacturing method thereof |
| CN102601277A (en) * | 2012-03-11 | 2012-07-25 | 莱芜市汇锋汽车轴齿有限公司 | Automobile gearbox intermediate gear shaft blank three-time wedging mould and rolling method thereof |
| CN104338750A (en) * | 2013-08-06 | 2015-02-11 | 袁文生 | Cross wedge rolling die for aluminum alloy formation |
| CN107088651A (en) * | 2017-07-10 | 2017-08-25 | 太极重工股份有限公司 | Multiple-piece centrifugal casting flange mould |
| CN210450429U (en) * | 2019-07-01 | 2020-05-05 | 沈阳理工大学 | Split assembly type roll bending roller |
| CN111250635A (en) * | 2020-01-20 | 2020-06-09 | 重庆大学 | Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece |
-
2021
- 2021-11-18 CN CN202111369004.3A patent/CN114178802A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4050273A (en) * | 1975-02-19 | 1977-09-27 | Sato Tekko Co., Ltd. | Cross-roll forging machine |
| US4411175A (en) * | 1979-10-18 | 1983-10-25 | Bridgestone Tire Co., Ltd. | Method for making a ring-shaped mold |
| CN2148612Y (en) * | 1992-12-03 | 1993-12-08 | 国营经纬纺织机械厂 | Roller |
| CN101322979A (en) * | 2008-08-05 | 2008-12-17 | 方崇实 | Assembly roller |
| CN101850366A (en) * | 2010-05-18 | 2010-10-06 | 柳州市半轴汽车配件有限责任公司 | Cross wedge rolling die |
| CN102489681A (en) * | 2011-12-29 | 2012-06-13 | 河北津西钢铁集团大方重工科技有限公司 | Centrifugally cast cross-wedge rolling die and manufacturing method thereof |
| CN102601277A (en) * | 2012-03-11 | 2012-07-25 | 莱芜市汇锋汽车轴齿有限公司 | Automobile gearbox intermediate gear shaft blank three-time wedging mould and rolling method thereof |
| CN104338750A (en) * | 2013-08-06 | 2015-02-11 | 袁文生 | Cross wedge rolling die for aluminum alloy formation |
| CN107088651A (en) * | 2017-07-10 | 2017-08-25 | 太极重工股份有限公司 | Multiple-piece centrifugal casting flange mould |
| CN210450429U (en) * | 2019-07-01 | 2020-05-05 | 沈阳理工大学 | Split assembly type roll bending roller |
| CN111250635A (en) * | 2020-01-20 | 2020-06-09 | 重庆大学 | Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece |
Non-Patent Citations (1)
| Title |
|---|
| 陆宝山: "模具材料与热处理", vol. 1, 31 January 2016, 上海科学技术出版社, pages: 202 * |
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