CN113787159B - Cross wedge rolling combined die of railway vehicle axle and forming method thereof - Google Patents
Cross wedge rolling combined die of railway vehicle axle and forming method thereof Download PDFInfo
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- CN113787159B CN113787159B CN202110846601.4A CN202110846601A CN113787159B CN 113787159 B CN113787159 B CN 113787159B CN 202110846601 A CN202110846601 A CN 202110846601A CN 113787159 B CN113787159 B CN 113787159B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
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Abstract
The invention belongs to the technical field of metal plastic forming, and particularly relates to a cross wedge rolling combined die of a railway vehicle axle and a forming method thereof. The combined die comprises a universal shaft body die for roll forming the shaft body part of the axle, and different axles can share the universal shaft body die; the special step forming die determines the die hole pattern according to the step shapes and sizes of different axles and is used for roll forming the step shapes and the other parts on two sides of the axles, and the universal axle body die and the special step forming die are combined to roll form the whole railway vehicle axle. The method greatly reduces the size and the weight of the cross wedge rolling die and the rolling mill, reduces the load of the rolling mill, and obviously reduces the die cost. The method is suitable for realizing the forming problem of the wedge cross rolling railway vehicle axle.
Description
Technical Field
The invention belongs to the technical field of metal plastic forming, and particularly relates to a cross wedge rolling combined die of a railway vehicle axle and a forming method thereof.
Background
The axle is a key part of the railway vehicle, and with the increasing scale of railway network construction, the market demand of the axle is large. Cross wedge rolling is a green advanced near-net forming technology and is widely applied to forming shaft parts. As a large batch of shaft parts, the axle of the railway vehicle is produced by adopting a cross wedge rolling near-net forming technology, and compared with the original forging, the axle has the advantages of high efficiency, material saving, environmental friendliness and the like. But the axle of the railway vehicle is an ultra-large shaft part with the diameter larger than phi 190mm and the length larger than 2200mm, a pair of dies and a single wedge are adopted for one-step forming, the diameter of the dies needs to be more than phi 3400mm, and the equipment is huge; and a pair of dies and a plurality of wedges are adopted for one-time forming, although the diameter of the die is reduced, the load of the device is increased by multiple times of that of a single wedge, and the difficulty of manufacturing and debugging the die is very high. Therefore, the equipment for forming the axle of the railway vehicle by using a pair of dies is huge and difficult to implement. In view of the above, there is a need to provide a solution to overcome or at least mitigate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In order to solve the problems, the invention provides a cross wedge rolling combined die of a railway vehicle axle and a forming method thereof, wherein the forming method is characterized in that the axle bodies of axles with different diameters are formed on a first pair of cross wedge rolling axle body general dies by adjusting the center distance of the dies; on the special die for forming the axle step of the second pair of cross wedge rolling, the die with different axle step hole patterns is adopted to roll and form the axle step and the rest parts at two sides, so that the whole axle is rolled and formed by combining the two pairs of dies. The method greatly reduces the size and the weight of the cross wedge rolling die and the rolling mill, reduces the load of the rolling mill, and obviously reduces the die cost. The method is suitable for realizing the forming problem of the wedge cross rolling railway vehicle axle.
The invention is realized by the following technical scheme:
the invention provides a cross wedge rolling combined die of a railway vehicle axle, which comprises:
the universal axle body die is used for roll forming the axle body part of the axle, and different axles can share the die;
the special step forming die determines a die hole pattern according to the shapes and sizes of different axle steps and is used for rolling and forming the step shape and other parts on two sides of the axle;
the universal die for the cross wedge rolling axle body and the special die for step forming are combined to roll and form the whole railway vehicle axle.
Furthermore, the universal axle body die does not comprise a hole pattern, and axle bodies of different diameters can be formed by adjusting the center distance of the die for different axles.
Further, the die wedge of the axle body general die consists of a forming section and a finishing section with the same top surface height H, the axle body general die forming section rolls the axle from an original diameter D0 to an axle body diameter D1 through the die wedge, the widening length M1 of the wedge is less than L1, and L1 is the axle body length.
Further, the inclination angle of the finishing section of the universal shaft body die is the inclination angle of an inclined step of the formed rolled piece and is equal to the forming angle alpha 1 of the forming section.
Furthermore, the step forming special die comprises all step passes of the axle, and the rest axle body, the wheel seat, the axle diameter and the steps among the rest axle body, the wheel seat and the axle diameter are rolled and formed, so that the axial size precision of axle forming is ensured.
Furthermore, the height and the axial position change of the top surface of the die wedge of the special die for step forming are matched with all the step hole patterns, and the forming angle and the spread angle of the residual shaft body forming part on the special die for step forming are equal to the forming angle alpha 1 and the spread angle beta 1 of the universal die for shaft body.
Furthermore, the shaft body general mold and the step forming special mold adopt a W multiplied by L standard block splicing mode, and mold blocks are arranged along a forming wedge.
Furthermore, a positioning key is arranged in the middle of a die block of the special die for step forming and used for offsetting the axial force of a rolled piece on the die in the rolling forming process.
Furthermore, the forming angle alpha 1 of the shaft body part of the die is 30-45 degrees, and the spreading angle beta 1 is 6.0-8.5 degrees. The forming alpha 2 angle of the outer step shaft section of the special die for forming the step is 27-42 degrees, and the spread angle beta 2 angle is 8-11.5 degrees.
Preferably, the forming angle alpha 1 of the shaft body part of the die is 40 degrees, and the spread angle beta 1 is 7.5 degrees. The forming angle alpha 2 of the outer step shaft section of the special die for step forming is 32 degrees, and the spread angle beta 2 is 9.5 degrees.
Furthermore, the general shaft body mould and the special step forming mould can be arranged on a parallel unit of two cross wedge rolling mills driven by motors independently or a series unit of cross wedge rolling mills driven by a motor in a centralized way.
Another object of the present invention is to provide a method of forming a cross wedge rolling combined mold for a railway vehicle axle, the method comprising the steps of:
s1, adjusting the center distance of the universal axle body die according to the diameter of the axle body of the rolled railway vehicle axle to ensure that the distance between the upper die and the lower die is correspondingly equal to the diameter of the axle body of the axle.
S2, heating an original rolled piece to a rolling temperature, conveying the original rolled piece into a first pair of cross wedge rolling dies, namely a shaft body universal die, driving the rolled piece to rotate under the driving of the die, rolling and forming most of a shaft body of the axle, wherein the two sides of the rolled piece are in an inclined step shape with an inclination angle equal to a forming angle of the die, and the rolling length M1 is less than L1, and L1 is the length of the shaft body of the axle;
s3, conveying the rolled piece into a second auxiliary wedge transverse rolling die, namely a die special for step forming, rotating the rolled piece under the driving of the die, unfolding the forming wedges from the inclined steps of the rolled piece, and rolling and forming the axle step and the rest parts at the two sides, wherein the rolling length is 2 multiplied by M2 and is equal to (L0-M1), and L0 is the total length of the axle;
after the two secondary molds are rolled twice, the whole axle of the railway vehicle is rolled and formed.
The invention has the beneficial effects that:
the technical scheme of the invention is suitable for realizing the cross wedge rolling forming of the axle of the railway vehicle, and the method for forming the axle of the railway vehicle by adopting the cross wedge rolling combined die can greatly reduce the size and the weight of the cross wedge rolling die and the rolling mill, reduce the load of the rolling mill and obviously reduce the die cost.
Drawings
Fig. 1 is a schematic view of the axle structure of a railway vehicle according to the embodiment of the present invention.
FIG. 2 is a schematic structural diagram of rolled pieces at different stages in the embodiment of the invention, which comprises the following steps: the rolling device comprises an original rolling piece (a), a first auxiliary die-formed rolling piece (b) and a second auxiliary die-formed rolling piece (c).
Fig. 3 is a schematic view (b) of the unfolding structure of the general axle body die (a) and the step forming die in the embodiment of the invention.
Fig. 4 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 3.
Fig. 5 is a schematic cross-sectional view of B-B in fig. 3.
FIG. 6 is a three-dimensional schematic view of a product and mold, including: the shaft forming die comprises a general shaft body die (a) and a step forming special die (b).
Fig. 7 is a schematic view of a mold block structure in the prior art.
FIG. 8 is a schematic view of a split die cross wedge mill train comprising: a parallel unit (a) and a series unit (b).
FIG. 9 is a flowchart of a method of forming a cross wedge rolling segmented mold for a railway vehicle axle in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings of the embodiments and the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
It should be understood that the described embodiments are only some 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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention relates to a method for forming a railway vehicle axle based on a cross wedge rolling combined die, which solves the problem of forming the railway vehicle axle shown in figure 1 and realizes the accurate forming of the cross wedge rolling railway vehicle axle.
Example 1
In the present embodiment, as shown in fig. 3 to 6, a cross wedge rolling combination die for a railway vehicle axle is provided, the die including: the first pair is a universal mould for a cross wedge rolling axle body, is used for rolling and forming part of the axle body of the axle, and different axles can share the mould; the special die for forming the step of the second pair of cross wedge rolling axles is used for rolling and forming the step shape and the rest parts at two sides of the axle, and the axial size precision of the axle is ensured. The mould blocks are distributed along the forming wedge, and the second pair of moulds adopts a middle positioning key to offset the axial force. The forming method is characterized in that the forming of axle bodies of axles with different diameters is realized on a first secondary cross wedge rolling axle body universal die by adjusting the center distance of the die; on the special die for forming the axle step of the second pair of cross wedge rolling, the die with different axle step hole patterns is adopted to roll and form the axle step and the rest parts at two sides, so that the whole axle is rolled and formed by combining the two pairs of dies.
Specifically, the axle body general die is used for roll forming the axle body part of the axle, and different axles share the die; the special step forming die determines a die hole pattern according to the shapes and sizes of different axle steps and is used for rolling and forming the step shape and other parts on two sides of the axle; the universal wedge cross rolling axle body forming die and the special step forming die are combined to roll and form the whole railway vehicle axle.
The universal axle body die does not comprise an axle step hole pattern, a die wedge consists of a forming section and a finishing section with the same top surface height H, the diameter D1 of the axle body is different from the original diameter D0, the diameter difference of (D0-D1) is also different, the top surface height H of the universal axle body die comprehensively considers the wedge height requirements of different axles, the wedge top surface height H = MAX ((D0-D1)/2) + delta is determined according to the maximum value of the diameter difference and a base circle gap, delta is the base circle gap, and delta =3mm is taken. When different axles are formed, the axle bodies with different diameters are adjusted by adjusting the center distance O of the die 1 O 2 Method (2)Realizing that the wedge height is the diameter difference (D0-D1)/2 of the axle, and the corresponding base circle gap is (H- (D0-D1)/2); the axle body general die forming section rolls the axle from the original diameter D0 to the axle body diameter D1 through a die wedge, and the widening length M1 of the wedge<L1, wherein L1 is the axle body length. The inclination angle of the finishing section of the shaft body universal die is the inclination angle of an inclined step of a formed rolled piece and is equal to the forming angle alpha 1 of the forming section.
The step forming special die comprises a pass of all steps of the axle, the height and axial position change of the top surface of a wedge of the die are matched with the pass, and the rest axle body, a wheel seat, the axle diameter and the steps among the axle body, the wheel seat and the axle diameter are rolled and formed, so that the axial size precision of axle forming is ensured; the forming angle and the spread angle of the forming part of the residual shaft body on the special step forming die are equal to the forming angle alpha 1 and the spread angle beta 1 of the general shaft body die; the shaft body general die and the step forming special die adopt a W multiplied by L standard block splicing mode, and die blocks are arranged along a forming wedge; and a positioning key is arranged in the middle of the mould block of the special step forming mould and used for offsetting the axial force of a rolled piece on the mould in the rolling forming process.
The forming angle alpha 1 of the shaft body part of the die is 30-45 degrees, and the spread angle beta 1 is 6.0-8.5 degrees. The forming alpha 2 angle of the outer step shaft section of the special die for forming the step is 27-42 degrees, and the spread angle beta 2 angle is 8-11.5 degrees. Preferably, the shaft general mold forming angle alpha 1 is 40 degrees, and the spread angle beta 1 is 7.5 degrees. The forming angle alpha 2 of the outer step shaft section of the special die for forming the step is 32 degrees, and the spread angle beta 2 is 9.5 degrees.
The universal shaft body die and the step forming die can be installed in a parallel wedge cross rolling mill unit driven by two motors independently or a series wedge cross rolling mill unit driven by one motor in a centralized manner, as shown in fig. 7.
Another object of the present invention is to provide a method of forming a cross wedge rolling combined mold for a railway vehicle axle, as shown in fig. 9, the method comprising the steps of:
s1, adjusting the center distance O of a universal mold of a shaft body according to the diameter of the shaft body of the rolled railway vehicle axle 1 O 2 To make the distance between the upper and lower dies and the vehicleThe shaft body diameters of the shafts are correspondingly equal.
S2, heating an original rolled piece (shown in (a) of a figure 2) to a rolling temperature, sending the rolled piece into a first pair of cross wedge rolling dies, namely a shaft body universal die, driving the rolled piece to rotate by the dies, rolling and forming most of a shaft body of an axle, wherein two sides of the rolled piece are in an inclined step shape (shown in (b) of the figure 2) with an inclination angle equal to a forming angle of the dies, the rolling length is M1< L1, and L1 is the length of the shaft body of the axle;
s3, conveying the rolled piece into a second auxiliary wedge transverse rolling die, namely a special step forming die, wherein the rolled piece is driven by the die to rotate, forming wedges are unfolded from the inclined steps of the rolled piece, and the steps and the rest parts on the two sides of the axle are rolled and formed (as shown in (c) in FIG. 2), wherein the rolling length is 2 multiplied by M2 and is equal to (L0-M1), and L0 is the total length of the axle; after the two pairs of dies are rolled twice, the whole axle of the railway vehicle is rolled and formed.
The wedge cross rolling combined die of the railway vehicle axle and the forming method thereof have the following realization principles:
the main structural form of the railway vehicle axle is shown in fig. 1, and the axle forms of different types have basically the same structure, but have different diameters and different step sizes. The axle body part of the axle which is mainly formed when the first pair of dies rolls is determined according to the structural characteristics that the axle has a longer axle body, and in order to ensure the axial size precision of the rolled axle, the dies only roll and form most of the axle body without determining the axial size of the axle body, namely the rolling length M1 of the part is less than L1. The single diameter of the axle body corresponds to the structural characteristics of simple, single-wedge and no step of the mould, the mould structure is universal for axles of any types, and the difference of the diameters of axle bodies of different axles can be realized by changing the center distance of the mould. Therefore, the first auxiliary die is used as a universal die, the number of the dies can be obviously reduced, the processing and manufacturing cost is saved, the time for installing and debugging the dies is reduced, and the advantages are prominent. The second set of dies rolls the remaining shaft and the other portions of the two sides. The diameter sizes and the step shapes of axles of different models are different, and the die hole pattern needs to be determined according to the rolled axle, so that the part is a special die. All the axle steps are concentrated in a special die, and are formed in one step in the restriction of the die hole pattern, so that the dimensional accuracy of the axle can be effectively ensured. The prior art die block configuration (as shown in fig. 6) can be optimized in view of the fact that the forming wedge, which is the primary role of the die in the rolling stock forming process, is inactive with the dies outside the forming wedge and inside the second set of die forming wedges (the formed shaft body portion). The use of standard mold blocks along the forming wedge, as shown in fig. 3, significantly reduces mold weight and cost. To the neutral gear that the vice mould piece intermediate position of second formed, increased the axial force that the rolling piece produced the mould among the positioning key offset rolling process, the positioning key plays the effect of axial positioning benchmark simultaneously, makes things convenient for the die holding.
In this embodiment, according to the cross wedge rolling combined die for a railway vehicle axle and the forming method thereof, the original rolled piece diameter D0 is Φ 228mm, and the size of the formed axle is: the total length L0 is 2201mm, the length L1 of the shaft body is 1150mm, the diameter D1 is phi 192mm, the length L2 of the wheel seat is 200.5mm, the length L3 of the shaft diameter is 179.5mm, and the diameter D2 is phi 162mm. The shaft body part of the die adopts a preferred forming angle alpha 1 and an angle of 40 degrees, and a preferred spreading angle beta 1 and an angle of 7.5 degrees. The forming alpha 2 angle of the outer step shaft section of the special step forming die is 32 degrees, and the spread angle beta 2 angle is 9.5 degrees. The rolling diameter D1 of the universal die for the shaft body is phi 192mm, the rolling length M1 is 990mm, the rolling length 2 multiplied by M2 of the special die for step forming is 2 multiplied by 525.5mm, and the special die for step forming comprises the residual shaft body, the wheel seat, the shaft diameter and steps among the residual shaft body, the wheel seat and the shaft diameter.
Example 2
The cross wedge rolling combination mold for a railway vehicle axle and the forming method thereof of the present embodiment are basically the same as those of embodiment 1, except that:
in the embodiment, according to the cross wedge rolling combined die for the axle of the railway vehicle and the forming method thereof, the original rolled piece diameter D0 is Φ 212mm, and the size of the formed axle is as follows: the total length L0 is 2161mm, the shaft length L1 is 1155mm, the diameter D1 is phi 182mm, the wheel seat length L2 is 202mm, the shaft diameter length L3 is 187mm, and the diameter D2 is phi 142mm. The general mould of axle body shares with embodiment 1, and the shaping alpha 2 angle of the outer step axle section of the special mould for step shaping is 27 degrees, and the spread angle beta 2 angle is 8 degrees. The rolling diameter D1 of the universal die for the shaft body is phi 182mm, the rolling length M1 is 990mm, the rolling length 2 multiplied by M2 of the special die for step forming is 2 multiplied by 585.5mm, and the special die for step forming comprises the residual shaft body, the wheel seat, the shaft diameter and steps among the residual shaft body, the wheel seat and the shaft diameter.
Example 3
The cross wedge rolling combined mold for a railway vehicle axle and the forming method thereof of the present embodiment are basically the same as those of embodiment 1, except that:
in this embodiment, according to the cross wedge rolling combined die for a railway vehicle axle and the forming method thereof, the original rolled piece diameter D0 is Φ 248mm, and the size of the formed axle is: the total length L0 is 2229mm, the shaft body length L1 is 1145mm, the diameter D1 is phi 208mm, the wheel seat length L2 is 196mm, the shaft diameter length L3 is 186mm, and the diameter D2 is phi 172mm. The axle body universal mold was used in common with example 1. The forming alpha 2 angle of the outer step shaft section of the special die for forming the step is 42 degrees, and the spread angle beta 2 angle is 11.5 degrees. The rolling diameter D1 of the universal die for the shaft body is phi 208mm, the rolling length M1 is 990mm, the rolling length 2 multiplied by M2 of the special die for step forming is 2 multiplied by 542mm, and the special die for step forming comprises the residual shaft body, the wheel seat, the shaft diameter and steps among the residual shaft body, the wheel seat and the shaft diameter.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A cross wedge rolling composite mold for a railway vehicle axle, the mold comprising:
the universal axle body die is used for roll forming of axle body parts of axles, different axles can share the universal axle body die, the universal axle body die does not comprise an axle step hole pattern, and axle bodies of different axles are formed by adjusting the center distance of the universal axle body die; the die wedge of the axle body general die consists of a forming section and a finishing section with the same top surface height H, the axle body general die forming section rolls an axle from an original diameter D0 to an axle body diameter D1 through the die wedge, the widening length M1 of the wedge is less than L1, and L1 is the axle body length of the axle;
the step forming special die determines the die hole pattern according to the shapes and the sizes of different axle steps and is used for rolling and forming the step shape and the rest parts at two sides of the axle, the step forming special die comprises all the step hole patterns of the axle, and the rest axle body, the wheel seat, the axle diameter and the steps between the rest axle body, the wheel seat and the axle diameter are rolled and formed to ensure the axial size precision of axle forming,
the axle body general die and the step forming special die are combined to roll and form the whole railway vehicle axle.
2. The cross wedge rolling segmented mold for railway vehicle axles of claim 1, wherein the inclination angle of the finishing section of said universal mold for axle bodies is the inclination angle of the inclined step of the formed rolled piece, and is equal to the forming angle α 1 of the forming section.
3. The cross wedge rolling combination die for railway vehicle axles as claimed in claim 1, wherein the die wedge top surface height and axial position variation of the step forming dedicated die are matched with all the step passes included, and the forming angle and spread angle of the remaining axle body forming part on the step forming dedicated die are equal to the forming angle α 1 and spread angle β 1 of the axle body general die.
4. The cross wedge rolling segmented mold for railway vehicle axles of claim 1, wherein said axle body general-purpose mold and step forming special-purpose mold are in the form of W x L standard block split, the mold blocks being arranged along the forming wedge;
and a positioning key is arranged in the middle of the die block of the special die for step forming and is used for offsetting the axial force of a rolled piece on the die in the rolling forming process.
5. The cross wedge rolling segmented mold for railway vehicle axles as claimed in claim 1, wherein the forming angle α 1 of the shaft body portion of the mold is 30 ° to 45 ° and the spread angle β 1 is 6.0 ° to 8.5 °; the forming angle alpha 2 of the outer step shaft section of the special die for forming the step is 27-42 degrees, and the spread angle beta 2 is 8-11.5 degrees.
6. The cross wedge rolling combined die for the axle of the railway vehicle as claimed in claim 1, wherein the general axle body die and the special step forming die can be installed in a parallel unit of two cross wedge rolling mills driven by motors independently or a series unit of cross wedge rolling mills driven by a motor in a centralized manner.
7. A method of forming a cross wedge rolling combined mold for a railway vehicle axle according to any one of claims 1 to 6, comprising the steps of:
s1, adjusting the center distance of a universal shaft body die according to the diameter of a shaft body of an axle of a rolled railway vehicle, so that the distance between an upper die and a lower die is correspondingly equal to the diameter of the shaft body of the axle;
s2, heating an original rolled piece to a rolling temperature, conveying the original rolled piece between general shaft body molds, wherein the original rolled piece is driven by the general shaft body molds to rotate, most shaft bodies of the axles are rolled and formed to form an intermediate rolled piece, two sides of the intermediate rolled piece are in an inclined step shape with an inclination angle equal to a mold forming angle, the rolling length M1 is less than L1, and L1 is the length of the axle body of the axle;
and S3, the intermediate rolled piece is conveyed between special step forming dies, the intermediate rolled piece is driven by the special step forming dies to rotate, forming wedges are unfolded from the inclined steps of the rolled piece, the steps and the rest parts on two sides of the axle are rolled and formed, the rolling length is 2 multiplied by M2 and is equal to (L0-M1), wherein L0 is the total length of the axle, and after two times of rolling, the whole axle of the railway vehicle is rolled and formed.
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS185515B1 (en) * | 1976-10-20 | 1978-10-31 | Jiri Talafous | Wedge-shaped tool for manufacture especially of long rolled products by transversal tapered rolling |
| EP1454685B1 (en) * | 2003-03-04 | 2014-08-13 | Langenstein & Schemann Gmbh | Method for forming a workpiece |
| CN1274436C (en) * | 2003-07-24 | 2006-09-13 | 北京科技大学 | Wdege transverse rolling precision-forming method of wheel axle blank of train |
| CN100389901C (en) * | 2006-11-27 | 2008-05-28 | 北京科技大学 | Wedge cross-rolling two cycle roll-forming method for train shaft blank |
| CN101658858B (en) * | 2009-09-16 | 2011-04-20 | 北京科技大学 | Cross wedge rolling forming method of hollow shaft head of automobile rear bridge |
| CN201921890U (en) * | 2010-12-09 | 2011-08-10 | 张家口宣化泰达机械设备制造有限公司 | Novel waterproof and dustproof cross wedge rolling mill |
| CN203779116U (en) * | 2014-03-28 | 2014-08-20 | 莱芜市汇锋汽车轴齿有限公司 | Equipment for producing large automobile semi-axle with cross wedge rolling machine and swing milling machine |
| US10279440B2 (en) * | 2015-05-11 | 2019-05-07 | Huaiji Dengyun Auto-Parts (Holding) Co., Ltd. | Precision forming method of high-efficiency and near-net hollow valve blank of engine |
| CN204672695U (en) * | 2015-06-09 | 2015-09-30 | 保定华建机械有限公司 | Double-roll type cross wedge rolling machine |
| CN110538880A (en) * | 2019-08-28 | 2019-12-06 | 天津市中重科技工程有限公司 | cross rolling process for large shaft wedge |
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