阅读说明：本技术 一种管筒形工件双环辊内接触式旋轧方法 (Double-ring roller internal contact type spin rolling method for tubular workpiece ) 是由 赵春江 李华英 仇云龙 许镱巍 李天宝 于 2020-08-26 设计创作，主要内容包括：本发明公开一种管筒形工件双环辊内接触式旋轧方法,具体按照如下步骤操作:将要进行加工的管筒形坯料套设在芯模上,使芯模和管筒形坯料中心轴线重合；将环筒形模具开始同向旋转,芯模沿中心轴线方向给进；管筒形坯料进入第一环筒形模具,对管筒形坯料进行初步旋轧,将未加工端加工成半成品端；将管筒形坯料的半成品端进入第二环筒形模具,进行再次旋轧,将半成品端加工成成品。本发明的环筒形模具旋轧方法采用模具内表面与管筒形工件外表面进行旋轧加工,工作面为环筒形模具的内圆弧环面,与管筒形坯料接触变形区有更大的包角,材料有更小的周向变形和径向变形速率,同时有较大的金属轴向延伸率,是一种经济、快速成形薄壁回转体零件的技术。(The invention discloses a double-ring roller internal contact type spin rolling method for a tubular workpiece, which comprises the following steps of sleeving a tubular blank to be processed on a core mold, and enabling the central axes of the core mold and the tubular blank to coincide; starting to rotate the annular cylindrical mold in the same direction, and feeding the core mold along the direction of the central axis; the tubular blank enters a first annular cylindrical die, the tubular blank is subjected to primary spin rolling, and the unprocessed end is processed into a semi-finished end; and (4) putting the semi-finished product end of the tubular blank into a second annular tubular mold, carrying out secondary spin rolling, and processing the semi-finished product end into a finished product. The ring-shaped die rotary rolling method adopts the inner surface of the die and the outer surface of the pipe-shaped workpiece to carry out rotary rolling processing, the working surface is the inner arc ring surface of the ring-shaped die, a larger wrap angle is formed in a contact deformation area with a pipe-shaped blank, the material has smaller circumferential deformation and radial deformation rate, and simultaneously has larger metal axial elongation, thereby being a technology for economically and rapidly forming a thin-wall revolving body part.)

1. A double-ring roller internal contact type spin rolling method for a tubular workpiece is characterized by comprising the following steps:

step 1, sleeving a pipe barrel-shaped blank (2) to be processed on a core mold (1) to enable the central axes of the core mold (1) and the pipe barrel-shaped blank (2) to coincide;

step 2, starting the first annular cylindrical mold (31) and the second annular cylindrical mold (32) to rotate in the same direction, and feeding the core mold (1) along the direction of the central axis; the tubular blank (2) enters a first annular tubular die (31); the first annular curved surface (311) of the first annular cylindrical die (31) is in contact with the outer surface of the tubular blank (2) and is pressed in along the radial direction of the tubular blank (2), and the pressing depth is reduced by an amount delta t 1; carrying out primary spin rolling on the tubular blank (2), and processing an unprocessed end into a semi-finished end;

step 3, putting the semi-finished end of the tubular blank (2) into a second annular cylindrical die (32), wherein a second annular curved surface (321) of the second annular cylindrical die (32) is in contact with the outer surface of the tubular blank (2) and is pressed in along the radial direction of the tubular blank (2), and the pressing depth forms a thinning amount delta t 2; (ii) a The tube-shaped blank (2) is subjected to spin rolling again, and the semi-finished end is processed into a finished end;

and 4, finishing the spin rolling of the tubular blank (2) by sequentially passing the first annular cylindrical die (31) and the second annular cylindrical die (32).

2. The double-ring roller internal contact type spin-rolling method for the tubular workpiece according to claim 1, wherein the preliminary spin-rolling in the step 2 specifically comprises: the first annular curved surface (311) and the contact surface of the tubular blank (2) form a lowest contact point and a highest contact point, the lowest contact point makes a perpendicular line towards the central axis of the tubular blank (2), the perpendicular foot O1 is taken as an origin, and the central axis of the tubular blank (2) is taken as an x axis to establish a three-dimensional spin-rolling coordinate system I; the z-axis forms a machining angle alpha 1 with the highest contact point;

and (3) making the first annular cylindrical mold (31) rotate in space, forming an adjusting angle beta 1 by the projection included angle of the central axis of the first annular cylindrical mold (31) on the x axis of the three-dimensional rotary rolling coordinate system I, and forming a feeding angle gamma 1 by the projection included angle on the z axis.

3. The double-ring roller internal contact type spin-rolling method for the tubular workpiece according to claim 1, wherein the step 3 of spin-rolling again specifically comprises the following steps: the second annular curved surface (321) and the contact surface of the tubular blank (2) form a lowest contact point and a highest contact point, the lowest contact point makes a perpendicular line towards the central axis of the tubular blank (2), the perpendicular foot O2 is taken as an origin, and the central axis of the tubular blank (2) is taken as an x axis to establish a three-dimensional spin-rolling coordinate system II; the z-axis forms a machining angle alpha 2 with the highest contact point;

and (3) the second annular cylindrical mold (32) is rotated in space, a projection included angle of the central axis of the second annular cylindrical mold (32) on an x axis forms an adjusting angle beta 2, and a projection included angle on a z axis forms a feeding angle gamma 2.

4. The double-ring roller internal contact type spin-rolling method of tubular workpieces according to claim 2, wherein the minimum inner diameter d1 of the first annular curved surface (311) is required to satisfy the following requirements: the smaller of both d1 & cos β 1 and d1 & cos γ 1 is larger than the outer diameter of the raw end of the tubular blank (2).

5. The double-ring roller internal contact type spin-rolling method of tubular workpieces according to claim 3, wherein the minimum inner diameter d2 of the second annular curved surface (321) is required to satisfy the following requirements: the smaller of d2 & cos beta 2 and d2 & cos gamma 2 is larger than the semi-finished end external diameter of the tubular blank (2).

6. The double-ring roller internal contact type spin-rolling method for the tubular workpiece according to claim 1, wherein the lowest contact point formed by radially pressing the tubular blank (2) by the first annular cylindrical die (31) and the second annular cylindrical die (32) is coplanar with the central axis of the tubular blank (2) and is respectively positioned on two sides of the central axis of the tubular blank (2).

7. The double-ring roller internal contact type spin-rolling method of the tubular workpiece according to claim 2, wherein the machining angle α 1 is 10 ° -40 °; adjusting the angle of the angle beta 1 to be +/-20 degrees; the angle of the feed angle γ 1 is ± 5 °.

8. The double-ring roller internal contact type spin-rolling method of the tubular workpiece according to claim 3, wherein the machining angle α 2 is 10 ° -40 °; adjusting the angle of the angle beta 2 to be +/-20 degrees; the angle of the feed angle γ 2 is ± 5 °.

Technical Field

The invention relates to the technical field of spinning and roll forming, in particular to a double-ring roller internal contact type spin rolling method for a tubular workpiece.

Technical Field

The technique of spinning or rolling a tubular workpiece is generally to rotate a die to force the metal from a point to a line and from a line to a surface while applying a certain pressure in a certain direction to deform and flow the metal material in this direction to form a set shape. Most of the existing spinning machines and rolling mills are in contact with the outer surface of a deformation die and the outer surface of a workpiece, and the contact wrap angle of a spinning wheel or a roller of the existing spinning machines and a blank contact deformation area of a tubular workpiece is small, so that the defects of longitudinal cracks, obvious ripples on the surface and the like are easily generated.

Disclosure of Invention

The invention aims to provide a double-ring roller internal contact type spin rolling method for a tubular workpiece, which is used for solving the problems in the prior art, can realize higher metal axial elongation and is a technology for economically and quickly forming a thin-wall revolving body part.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a double-ring roller internal contact type spin rolling method for a tubular workpiece, which specifically comprises the following steps:

step 1, sleeving a pipe barrel-shaped blank to be processed on a core mold, and enabling central axes of the core mold and the pipe barrel-shaped blank to coincide;

step 2, starting the first annular cylindrical mold and the second annular cylindrical mold to rotate in the same direction, and feeding the core mold along the direction of the central axis; the tubular blank enters a first annular cylindrical die; the first annular curved surface of the first annular cylindrical die is in contact with the outer surface of the tubular blank and is pressed in along the radial direction of the tubular blank, and the pressing depth forms a thinning amount delta t 1; carrying out primary spin rolling on the tubular blank, and processing an unprocessed end into a semi-finished end;

step 3, enabling the semi-finished product end of the tubular blank to enter a second annular cylindrical die, enabling a second annular curved surface of the second annular cylindrical die to be in contact with the outer surface of the tubular blank and pressing the tubular blank in the radial direction, and enabling the pressing depth to form a thinning amount delta t 2; (ii) a The tube-shaped blank is subjected to spin rolling again, and a semi-finished end is processed into a finished end;

and 4, finishing the rotary rolling of the tubular blank by sequentially passing the tubular blank through the first annular cylindrical die and the second annular cylindrical die.

Preferably, a common central axis of the tube-shaped blank and the core mold is X1, and axes of the first annular cylinder-shaped die and the second annular cylinder-shaped die are X21 and X22, respectively.

Preferably, the outer diameter of the unprocessed end of the tubular blank is D1, the outer diameter of the semi-finished end of the tubular blank is D2, the outer diameter of the finished end of the tubular blank is D3, and the outer diameter relation of the finished end of the tubular blank is D1, D2 and D3.

Preferably, the first annular cylinder-shaped die and the second annular cylinder-shaped die are both annular spinning wheels.

Preferably, step 2 and step 3 can be performed simultaneously after the thinning amount Δ t is formed in step 1, and there is no precedence order.

The preliminary spin rolling in the step 2 specifically comprises the following steps: a contact lowest point and a contact highest point are formed on the contact surface of the first annular curved surface and the tubular blank, the contact lowest point makes a perpendicular line towards the central axis of the tubular blank, the perpendicular foot O1 is taken as an origin, and the central axis of the tubular blank is taken as an x axis to establish a three-dimensional spin-rolling coordinate system I; the z-axis forms a machining angle alpha 1 with the highest contact point;

and (3) spatially rotating the first annular cylindrical mold, wherein a projection included angle of the central axis of the first annular cylindrical mold on an x axis of the three-dimensional rotary rolling coordinate system I forms an adjusting angle beta 1, and a projection included angle on a z axis forms a feeding angle gamma 1.

The second spin rolling in the step 3 specifically comprises the following steps: a contact lowest point and a contact highest point are formed on the contact surface of the second annular curved surface and the tubular blank, the contact lowest point makes a perpendicular line towards the central axis of the tubular blank, the perpendicular foot O2 is taken as an origin, and the central axis of the tubular blank is taken as an x axis to establish a three-dimensional spin-rolling coordinate system II; the z-axis forms a machining angle alpha 2 with the highest contact point;

and (3) the second annular cylindrical mold is rotated in space, a projection included angle of the central axis of the second annular cylindrical mold on an x axis forms an adjusting angle beta 2, and a projection included angle on a z axis forms a feeding angle gamma 2.

The minimum inner diameter d1 of the first annular curved surface is required to satisfy the following conditions: the smaller of both d1 & cos β 1 and d1 & cos γ 1 is larger than the tube cylindrical blank raw end outer diameter.

The minimum inner diameter d2 of the second annular curved surface needs to satisfy the following requirements: the smaller of both d2 & cos β 2 and d2 & cos γ 2 is larger than the tube blank end outside diameter.

The first annular cylindrical die and the second annular cylindrical die are respectively in coplanar with the central axis of the tubular blank at the lowest contact point formed by radially pressing the tubular blank, and are respectively positioned at two sides of the central axis of the tubular blank.

The angle of the processing angle alpha 1 is 10-40 degrees; adjusting the angle of the angle beta 1 to be +/-20 degrees; the angle of the feed angle γ 1 is ± 5 °.

The angle of the processing angle alpha 2 is 10-40 degrees; adjusting the angle of the angle beta 2 to be +/-20 degrees; the angle of the feed angle γ 2 is ± 5 °.

Preferably, the adjusting angles β 1 and β 2 and the feeding angles γ 1 and γ 2 may move in the same direction or rotate in opposite directions; the machining angles α 1, α 2 and the adjustment angles β 1, β 2 are in the same adjustment direction, and are adjusted toward a direction in which the axial distance X1 from the lowest contact point is shortened;

preferably, γ 1, γ 2 are oppositely turned with respect to the axis X1.

The invention discloses the following technical effects: 1. the invention realizes the adjustment of the spin-rolling process parameters by simultaneously or independently changing the thinning amount delta t, the adjusting angle beta and the feed angle gamma.

2. The annular cylinder-shaped die can be in an inclined state relative to the tube blank by changing the adjusting angle beta and the feeding angle gamma, the wrap angle range of the annular cylinder-shaped die and the tube-shaped blank spin-rolling deformation area can be adjusted, and an axial component speed and a thrust which are beneficial to the flowing of a metal material are generated, so that the metal flowing capacity is improved, and the deformation resistance and the stress on a dangerous section are reduced; the defects of metal accumulation, diameter expansion, pipe bending, longitudinal cracks, obvious ripples on the surface and the like which are easily caused by a general external spinning wheel spinning method can be avoided.

3. In the working state, the tubular blank and the core mold are axially fed relative to the annular tubular mold along the central line direction of the tubular blank, and the deformation area of the annular tubular blank is the inner containing surface of the annular rotary wheel, so that the material is difficult to generate circumferential additional deformation; meanwhile, compared with an external contact type spin rolling mode, the contact deformation area is increased, the spin rolling force is increased, and the spin permeability is enhanced.

4. The two annular rollers are adopted to realize continuous 2-pass rotary rolling, so that the production efficiency is improved; meanwhile, the two contact lowest points are coplanar and respectively positioned on two sides of the rolling center line, so that the radial force of a single die on the tubular workpiece and the transverse moment of an accessory of the tubular workpiece are favorably counteracted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic diagram of the initial state structural arrangement of the present invention.

Fig. 2 is a schematic diagram of an operating state according to an embodiment of the present invention.

Fig. 3 is a schematic view of machining angles α 1 and α 2 according to an embodiment of the present invention.

Fig. 4 is a schematic structural arrangement diagram of the second embodiment of the present invention.

Fig. 5 is a schematic view of the xy plane projection of the second adjustment angles β 1 and β 2 according to the embodiment of the present invention.

Fig. 6 is a schematic projection diagram of the second advance angles γ 1, γ 2 on the yz plane according to the embodiment of the present invention.

Fig. 7 is a schematic diagram of the arrangement of three structures in the embodiment of the invention.

The method comprises the following steps of 1-core die, 2-tube-shaped blank, 31-first ring-shaped tube-shaped die, 32-second ring-shaped tube-shaped die, 311-first annular curved surface, 321-second annular curved surface, d 1-first annular curved surface inner diameter, d 2-second annular curved surface inner diameter, alpha 1, alpha 2-processing angle, beta 1, beta 2-adjusting angle, gamma 1, gamma 2-feeding angle, X1-core die and tube-shaped blank axis, X21-first ring-shaped tube-shaped die axis and X22-second ring-shaped tube-shaped die axis;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The invention provides a double-ring roller internal contact type spin rolling method for a tubular workpiece, which specifically comprises the following steps:

step 1, sleeving a pipe barrel-shaped blank 2 to be processed on a core mold 1, and enabling the central axes of the core mold 1 and the pipe barrel-shaped blank 2 to coincide;

step 2, starting the first annular cylindrical mold 31 and the second annular cylindrical mold 32 to rotate in the same direction, and feeding the core mold 1 along the central axis direction; the tubular blank 2 enters the first annular tubular die 31; the first annular curved surface 311 of the first annular cylindrical die 31 is in contact with the outer surface of the tubular blank 2 and is pressed in along the radial direction of the tubular blank 2, and the pressing depth is reduced by delta t 1; carrying out primary spin rolling on the tubular blank 2, and processing an unprocessed end into a semi-finished end;

step 3, putting the semi-finished end of the tubular blank 2 into a second annular cylindrical die 32, wherein a second annular curved surface 321 of the second annular cylindrical die 32 is in contact with the outer surface of the tubular blank 2 and is pressed in along the radial direction of the tubular blank 2, and the pressing depth forms a thinning amount delta t 2; (ii) a The tube-shaped blank 2 is subjected to spin rolling again, and the semi-finished end is processed into a finished end;

and 4, finishing the spin rolling of the tubular blank 2 sequentially through the first annular cylindrical die 31 and the second annular cylindrical die 32.

The preliminary spin rolling in the step 2 specifically comprises the following steps: a contact lowest point and a contact highest point are formed on the contact surface of the first annular curved surface 311 and the tubular blank 2, the contact lowest point makes a perpendicular line towards the central axis of the tubular blank 2, the perpendicular foot O1 is taken as an origin, and the central axis of the tubular blank 2 is taken as an x axis to establish a three-dimensional spin-rolling coordinate system I; the z-axis forms a processing angle alpha 1 with the highest contact point;

the first annular cylindrical mold 31 is rotated in space, a projection included angle of the central axis of the first annular cylindrical mold 31 on the x axis of the three-dimensional rotary rolling coordinate system I forms an adjusting angle beta 1, and a projection included angle on the z axis forms a feeding angle gamma 1.

The second spin rolling in the step 3 specifically comprises the following steps: a contact lowest point and a contact highest point are formed on the contact surface of the second annular curved surface 321 and the tubular blank 2, the contact lowest point makes a perpendicular line towards the central axis of the tubular blank 2, the perpendicular foot O2 is taken as an origin, and the central axis of the tubular blank 2 is taken as an x axis to establish a three-dimensional spin-rolling coordinate system II; the z-axis forms a machining angle alpha 2 with the highest contact point;

the second annular cylindrical mold 32 is rotated spatially, a projection included angle of the central axis of the second annular cylindrical mold 32 on the x axis forms an adjustment angle β 2, and a projection included angle on the z axis forms a feed angle γ 2.

The minimum inner diameter d1 of the first annular curved surface 311 needs to satisfy: the smaller of d1 & cos β 1 and d1 & cos γ 1 is larger than the outer diameter of the unprocessed end of the tubular blank 2.

The minimum inner diameter d2 of the second annular curved surface 321 is satisfied: the smaller of d2 & cos β 2 and d2 & cos γ 2 is larger than the outer diameter of the semi-finished end of the tubular blank 2.

The lowest point of contact formed by radially pressing the tubular blank 2 in by the first annular cylindrical die 31 and the second annular cylindrical die 32 is coplanar with the central axis of the tubular blank 2 and is respectively positioned at two sides of the central axis of the tubular blank 2.

The angle of the processing angle alpha 1 is 10-40 degrees; adjusting the angle of the angle beta 1 to be +/-20 degrees; the angle of the feed angle γ 1 is ± 5 °.

The angle of the processing angle alpha 2 is 10-40 degrees; adjusting the angle of the angle beta 2 to be +/-20 degrees; the angle of the feed angle γ 2 is ± 5 °.

In the embodiment of the invention, the outer dimension of the core mould 1 is selected as the outer diameter

The external dimension of the tubular blank 2 is the external diameterWall thickness 3.5mm, inner diameterMinimum diameter of the first annular curved surface 311 and the second annular curved surface 321The machining angle α 1 — α 2 is 30 °. The processing technological parameters are as follows: the tubular billet 2 is fed at a speed v of 2mm/s, and the first annular cylindrical die 31 and the second annular cylindrical die 32 rotate at a speed n of 100rpm in the same direction.

In the first embodiment of the present invention, as shown in fig. 2, in the initial feeding state, the adjustment angle β 1 ═ β 2 ═ 0, and the feeding angle γ 1 ═ γ 2 ═ 0; the inner surface of the tubular blank 2 is sleeved on the outer surface of the core mould 1, and the first annular curved surface 311 and the second annular curved surface 321 surround the outer surface of the tubular blank 2 and are in internal contact with the outer surface.

The first annular curved surface 311 and the second annular curved surface 321 are respectively pressed into the outer surface of the blank at the unprocessed end and the outer surface of the semi-finished product end of the tubular blank 2 along the radial direction of the tubular blank 2, the pressing depth is reduced by delta t1 and delta t2, the contact points of the first annular curved surface 311 and the second annular curved surface 321, which are closest to the axis X1, with the tubular blank 2 are respectively set as 21 and 22, and the contact points at the farthest are respectively set as 211 and 221; the contact points 21 and 22 are coplanar with the axis X1 and are respectively positioned on two sides of the axis X1; taking the contact points 21 and 22 as vertical lines towards an axis X1, respectively setting the vertical feet as O1 and O2, respectively setting O1 and O2 as original points, respectively setting an axis X1 as an X axis, establishing a three-dimensional spin-rolling coordinate system I and a three-dimensional spin-rolling coordinate system II, and respectively setting angles formed by the points 21 and 211 and the points 22 and 221 by respectively taking points O1 and O2 as vertexes as processing angles alpha 1 and alpha 2;

in the working state of the rotary rolling, the following 2 relative changes are generated relative to the initial state: 1) the tube-shaped blank 2 and the core mold 1 are not moved, and the contact points 21 and 22 adjust the thinning amounts Δ t1 and Δ t2 simultaneously or separately along the radial direction of the tube-shaped workpiece blank 2; 2) the contact points 21 and 22 are used as support points, the first annular cylindrical die 31 and the second annular cylindrical die 32 rotate in space simultaneously or independently, the axes X21 and X22 form adjusting angles beta 1 and beta 2 with the projection included angles of the X axis in the three-dimensional rotary rolling coordinate system I and the three-dimensional rotary rolling coordinate system II, and the projection included angles of the z axis in the three-dimensional rotary rolling coordinate system I and the three-dimensional rotary rolling coordinate system II form feeding angles gamma 1 and gamma 2. The above relative changes 1) and 2) are not in sequence.

And (3) carrying out spin rolling on the tubular blank 2 through a tubular die to form a finished product of a thinned finished product end.

In the second embodiment of the invention, the annular cylindrical mold is an annular rotary wheel; as shown in fig. 4, the adjustment angle β 1 ═ β 2 ═ 10 °, the feed angle γ 1 ═ γ 2 ═ 0.5 °; wherein the adjusting angles beta 1 and beta 2 rotate in the same direction as the feeding angles gamma 1 and gamma 2; the first annular curved surface 311 and the second annular curved surface 321 are press-fitted into the outer surface of the tubular blank 2 to have a press-fitting depth of 0.9mm, Δ t1 mm, and an inner contact state is established therebetween. The core mold 1 and the tube-shaped blank 2 are positively rotated about their axis X1 and are axially fed in the direction of the arrow shown in fig. 6 along X1. The tubular workpiece blank 2 contacts the first annular curved surface 311 and the second annular curved surface 321 to drive the first annular rotary wheel 31 and the first annular rotary wheel 32 to rotate around the axes X21 and X22 respectively.

In the third embodiment of the invention, the annular cylindrical mold is an annular rotary wheel; as shown in fig. 7; in the figure, the adjustment angle β 1 is 10 °, β 2 is-10 °, the feed angle γ 1 is 0.5 °, and γ 2 is-0.5 °; wherein the adjusting angles beta 1 and beta 2 and the feeding angles gamma 1 and gamma 2 respectively rotate oppositely; the annular curved surface is press-fitted into the outer surface of the tubular workpiece blank 2 to an initial thinning amount Δ t1 of 0.9mm and a pressing depth Δ t1 of 0.6mm, which are brought into internal contact with each other. The mandrel 1 and the tubular blank 2 are fed axially along the axis X1, as shown by the arrow in fig. 7, the ring-shaped dies 31, 32 being actively rotated about their axes X21, X22. The tube-shaped workpiece blank 2 contacts the inner arc surfaces 311 and 321 of the annular rotary wheels to drive the tube blank 2 and the core mould 1 to rotate around the axis X1.

The invention provides a method for rolling an annular cylinder mould by adopting the inner surface of the mould and the outer surface of a pipe-shaped workpiece, wherein the working surface is the inner arc ring surface of the annular cylinder mould, a contact deformation area with a pipe-shaped blank has a larger wrap angle, the material has smaller circumferential deformation and radial deformation rate, and simultaneously has larger metal axial elongation, thus the method is a technology for economically and quickly forming a thin-wall revolving body part.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.