阅读说明：本技术 一种超薄壁弯管旋弯成形方法及装置 (Ultra-thin wall bent pipe rotary bending forming method and device ) 是由 王辉 郭训忠 程诚 胡胜寒 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种超薄壁弯管旋弯成形方法及装置,包括推进机构(1)、压紧机构(2)、旋轮面外运动驱动机构、旋轮面内运动驱动机构、若干个旋轮(6)；若干个旋轮(6)的旋轮面在同一个圆平面内组成旋轮组,旋轮面内运动驱动机构用于驱动各个旋轮(6)在该圆平面内自转、公转和/或沿该圆平面的径向运动,旋轮面外运动驱动机构(3)用于驱动旋轮(6)所在的圆平面沿着一定轨迹运动,达到改变旋轮(6)的公转平面的目的。本发明通过改变旋轮的运动轨迹以及柔性芯棒的方向来改变管材的弯曲方向、弯曲半径,以实现超薄壁管材的空间三维弯曲,本发明方法简单可行,可以大幅度提高生产效率。(The invention discloses a method and a device for forming an ultrathin-wall bent pipe in a rotary bending mode, wherein the device comprises a propelling mechanism (1), a pressing mechanism (2), a rotary wheel out-of-plane motion driving mechanism, a rotary wheel in-plane motion driving mechanism and a plurality of rotary wheels (6); the rotary wheel surfaces of the rotary wheels (6) form rotary wheel groups in the same circular plane, the rotary wheel in-plane motion driving mechanism is used for driving each rotary wheel (6) to rotate, revolve and/or move along the radial direction of the circular plane in the circular plane, and the rotary wheel out-of-plane motion driving mechanism (3) is used for driving the circular plane where the rotary wheels (6) are located to move along a certain track, so that the purpose of changing the revolution plane of the rotary wheels (6) is achieved. The invention changes the bending direction and the bending radius of the pipe by changing the motion track of the rotary wheel and the direction of the flexible core rod so as to realize the space three-dimensional bending of the ultrathin-wall pipe.)

1. A device for forming ultrathin-wall bent pipes by rotary bending is characterized by comprising a propelling mechanism (1), a pressing mechanism (2), a rotary wheel out-of-plane motion driving mechanism, a rotary wheel in-plane motion driving mechanism and a plurality of rotary wheels (6); the rotary wheel surfaces of the rotary wheels (6) form rotary wheel groups in the same circular plane, the rotary wheel in-plane motion driving mechanism is used for driving each rotary wheel (6) to rotate, revolve and/or move along the radial direction of the circular plane in the circular plane, and the rotary wheel out-of-plane motion driving mechanism (3) is used for driving the circular plane where the rotary wheels (6) are located to move along a certain track, so that the purpose of changing the revolution plane of the rotary wheels (6) is achieved.

2. The ultra-thin wall elbow rotary bending forming device according to claim 1, wherein the rotary wheel in-plane movement driving mechanism comprises a first gear (4) and a second gear (10) meshed with the first gear (4), the first gear (4) is provided with moving chutes (12) with the same number as that of the rotary wheels, the rotary wheels (6) move in the moving chutes (12) along the radial direction of the first gear ()4 according to setting, the rotary wheels (6) also rotate along the self rotating shaft, the center of the first gear (4) is provided with a through hole for the pipe (7) to enter, the second gear (10) drives the first gear (4) to rotate, and each rotary wheel revolves around the pipe (7).

3. The ultra-thin wall elbow bending and forming device according to claim 1, wherein the rotating wheel out-of-plane movement driving mechanism comprises a rotating wheel rotating disc (3) and a worm (11), the first gear (4), the second gear (10) and the rotating wheel are fixedly arranged in a cavity inside the rotating wheel rotating disc (3), a tooth form matched with the worm is arranged at the bottom of the rotating wheel rotating disc (3), and the rotating wheel rotating disc (3) can move along a certain track under the driving of the worm (11), so that the purpose of changing the revolution plane of the rotating wheel (6) is achieved.

4. The ultra-thin wall elbow whirling and bending forming device according to claim 1, characterized in that the diameter of the through hole arranged in the center of the first gear (4) for the pipe (7) to enter is more than 1.25 times of the pipe diameter.

5. The ultra-thin wall elbow bending and forming device according to claim 1, wherein the number of the rotary wheels (6) is 3, and the included angle between the rotary wheels is 120 degrees.

6. The ultra-thin wall bent pipe rotary bending forming device according to claim 1, wherein the pushing mechanism (1) pushes the pipe blank to generate a small feeding amount delta compared with the bending radius of the pipe blank.

7. The ultra-thin wall elbow rotary bending forming device according to claim 1, further comprising a flexible core mold (8) arranged inside the pipe (7), wherein the radius of the flexible core mold (8) is changed in a certain taper, and the radius of the large end is slightly smaller than that of the pipe blank so that feeding can be smoothly carried out; the flexible core mould (8) passively follows the bending direction and the bending radius of the pipe to generate corresponding deformation and adjustment while supporting the pipe wall without collapse.

8. A method for forming ultra-thin wall bent tubes by rotary bending according to any one of claims 1 to 7, comprising the steps of:

1) designing an out-of-plane revolution trajectory of the three spinning wheel according to the space shape requirement of the pipe to be bent, and adjusting the direction of the bending section of the flexible core mold (8); the relative movement position of the rotary wheel (6) in the movable sliding chute (12) is adjusted according to the bending pipe diameter.

2) The pipe (7) moves forwards by a small feeding amount delta under the pushing of the pushing mechanism (1), and the pressing mechanism (2) clamps and positions the pipe (7).

3) The pipe enters a progressive deformation zone, a driving mechanism for the out-of-plane motion of the spinning wheel drives three spinning wheels (6) to perform reciprocating revolution motion in the progressive deformation zone, a second gear (10) drives a first gear (4) to enable the three spinning wheels (6) to revolve around the pipe, the three spinning wheels keep rotating at the same time, and the pipe is formed by rotation and bending under the combined action of a flexible core mold 8 in the pipe;

4) and the tail end of the pipe passes through a gradual deformation area, and finally the pipe is subjected to rotary bending forming.

9. The ultra-thin wall elbow bending forming method according to claim 8, wherein in the step 1), the bending direction and the bending radius of the pipe are determined by the out-of-plane revolution orbit line of the three-turn wheel.

10. The ultra-thin wall elbow bending forming method according to claim 8, wherein in the step 3), the rotation center line of revolution of the spinning wheel (6) is the bending center line of the progressive deformation zone.

Technical Field

The invention belongs to the technical field of advanced manufacturing of ultrathin-wall pipes, and particularly relates to a method and a device for forming an ultrathin-wall bent pipe in a rotary bending mode.

Background

For an ultrathin-wall pipe with a thin wall thickness (the diameter/wall thickness is more than or equal to 20), especially with a diameter-wall thickness ratio of more than 100, the pipe has high section strength, can reduce the weight of parts, can show the strength and rigidity of materials to the greatest extent, realizes light structure, and has wide requirements in the fields of aerospace, ship manufacturing, engineering machinery, pipeline engineering and the like.

With the rapid development of various industries, the forming quality of the ultrathin-wall pipe has higher and higher requirements, and the bending forming of the ultrathin-wall pipe is a complex pipe forming technology. In the traditional ultra-thin wall pipe forming process, because the pipe bends to cause larger deformation of the pipe, the forming defects such as instability and wrinkling, section distortion, pipe breakage and the like are easily caused, and the forming quality and the forming precision of the pipe hardly meet the requirements.

Disclosure of Invention

Aiming at the limitations and the defects of the existing forming technology, the invention provides a method and a device for forming an ultrathin-wall bent pipe by rotary bending, wherein the bending direction and the bending radius of the pipe are changed by changing the motion track of a rotary wheel and the direction of a flexible core rod, so that the space three-dimensional bending of the ultrathin-wall pipe is realized.

The technical scheme of the invention is as follows:

a device for forming an ultrathin-wall bent pipe by rotary bending comprises a propelling mechanism (1), a pressing mechanism (2), a rotary wheel out-of-plane motion driving mechanism, a rotary wheel in-plane motion driving mechanism and a plurality of rotary wheels (6); the rotary wheel surfaces of the rotary wheels (6) form rotary wheel groups in the same circular plane, the rotary wheel in-plane motion driving mechanism is used for driving each rotary wheel (6) to rotate, revolve and/or move along the radial direction of the circular plane in the circular plane, and the rotary wheel out-of-plane motion driving mechanism (3) is used for driving the circular plane where the rotary wheels (6) are located to move along a certain track, so that the purpose of changing the revolution plane of the rotary wheels (6) is achieved.

Ultra-thin wall return bend forming device, the internal motion actuating mechanism of spinning wheel includes first gear (4), second gear (10) with first gear (4) meshing, seted up on first gear (4) and spun the same removal spout (12) of quantity with spinning wheel, spinning wheel (6) are according to setting for radially carrying out the motion along first gear ()4 in removal spout (12), spinning wheel (6) still keep carrying out the rotation along self pivot, first gear (4) center sets up the through-hole that is used for tubular product (7) to get into, second gear (10) drive first gear (4) rotate, each spins and takes turns round the revolution around tubular product (7).

Ultra-thin wall return bend forming device that bends soon, spinning wheel off-plate motion actuating mechanism include spinning wheel carousel (3), worm (11), first gear (4) and second gear (10) and spinning wheel all install and fix in spinning wheel carousel (3) inside cavity, spinning wheel carousel (3) bottom set up with worm complex profile of tooth, spinning wheel carousel (3) can move along certain orbit under the drive of worm (11), reach the planar purpose of revolution that changes spinning wheel (6).

According to the ultra-thin wall bent pipe rotary bending forming device, the diameter of a through hole for the pipe (7) to enter is larger than 1.25 times of the diameter of the pipe in the center of the first gear (4).

According to the ultra-thin wall elbow pipe rotary bending forming device, the number of the rotary wheels (6) is 3, and the included angle between the rotary wheels is 120 degrees.

According to the ultra-thin wall bent pipe rotary bending forming device, the pushing mechanism (1) pushes the pipe blank to generate a numerical value of a small feeding amount delta which is smaller than the bending radius of the pipe blank.

The ultra-thin wall elbow rotary bending forming device also comprises a flexible core mold (8) arranged in the pipe (7), wherein the radius of the flexible core mold (8) is changed in a certain taper, and the radius of the large end is slightly smaller than that of the pipe blank so that feeding can be smoothly carried out; the flexible core mould (8) passively follows the bending direction and the bending radius of the pipe to generate corresponding deformation and adjustment while supporting the pipe wall without collapse.

The method for carrying out the ultra-thin wall elbow pipe rotary bending forming according to any device is realized by the following steps:

1) designing an out-of-plane revolution trajectory of the three spinning wheel according to the space shape requirement of the pipe to be bent, and adjusting the direction of the bending section of the flexible core mold (8); the relative movement position of the rotary wheel (6) in the movable sliding chute (12) is adjusted according to the bending pipe diameter.

2) The pipe (7) moves forwards by a small feeding amount delta under the pushing of the pushing mechanism (1), and the pressing mechanism (2) clamps and positions the pipe (7).

3) The pipe enters a progressive deformation zone, a driving mechanism for the out-of-plane motion of the spinning wheel drives three spinning wheels (6) to perform reciprocating revolution motion in the progressive deformation zone, a second gear (10) drives a first gear (4) to enable the three spinning wheels (6) to revolve around the pipe, the three spinning wheels keep rotating at the same time, and the pipe is formed by rotation and bending under the combined action of a flexible core mold 8 in the pipe;

4) and the tail end of the pipe passes through a gradual deformation area, and finally the pipe is subjected to rotary bending forming.

In the method for forming the ultrathin-wall bent pipe by the rotary bending, in the step 1), the bending direction and the bending radius of the pipe are determined by the out-of-plane revolution trajectory of the three-turn wheel.

In the ultra-thin wall bent pipe rotary bending forming method, in the step 3), the revolution central line of the rotary wheel (6) is the bending central line of the progressive deformation zone.

In the method for forming the ultra-thin wall bent pipe by the rotary bending, in the step 3), the rotary wheel (6) moves in three aspects in the progressive deformation area: rotation in the plane of the three-spinning wheel, radial contraction of the rotation track, and revolution of the rotation plane of the three-spinning wheel by taking the bending central line of the pipe as a rotation track.

In the ultra-thin wall elbow pipe rotary bending forming method, in the step 3), in the ultra-thin wall elbow pipe rotary bending forming process, the out-of-plane revolution of the three-spinning wheel is circularly performed in the gradual deformation zone, and each cycle process is loaded and returned without load. One cycle of the three-wheel out-of-plane revolution is as follows: after the pushing mechanism (1) pushes the tube blank to generate a small feeding quantity delta, the tube blank revolves outside the three-spinning wheel surface and enters a loading process to deform, and the return no-load tube blank does not deform.

In the ultra-thin wall bent pipe rotary bending forming method, in the step 3), in the ultra-thin wall bent pipe rotary bending forming process, the bending radius of the pipe is influenced by the envelope curve of the rotary wheel formed by the radial shrinkage of the rotation orbit of the rotary wheel (6) and the revolution around the bending central line.

In the step 3), in the process of the spin-bending forming of the ultra-thin wall elbow, the revolution speed of the rotary wheel (6) is 500-750 revolutions per minute.

Has the advantages that:

1. the invention provides a new forming technology for forming the ultrathin-wall pipe.

2. The invention changes the bending direction and the bending radius of the pipe by changing the motion track of the rotary wheel and the direction of the flexible core rod so as to realize the space three-dimensional bending of the ultrathin-wall pipe.

3. The invention is widely applied in the fields of aerospace, ship manufacturing, engineering machinery, pipeline engineering and the like, and plays an important role in reducing weight, reducing cost and improving the forming quality and forming precision of pipes.

Drawings

FIG. 1 is a schematic view of the principle of forming ultra-thin wall elbow by rotary bending.

Fig. 2 is a schematic view of the rotary plane of the spinning wheel.

FIG. 3 is a schematic diagram of the position of the moving chute.

FIG. 4.5A03 aluminum alloy part schematic illustration example.

FIG. 5 is a schematic illustration of an example of a H62 copper alloy part.

FIG. 6 shows an example schematic view of a GH625 superalloy part.

The device comprises a propelling mechanism 1, a pressing mechanism 2, a rotary wheel turntable 3, a first gear 4, a rotary wheel rotating shaft 5, a rotary wheel 6, a pipe 7, a flexible core mold 8, a gear shaft 9, a second gear 10, a worm 11 and a moving chute 12.

Detailed Description

The present invention will be described in detail with reference to specific examples.

A ultra-thin wall bent pipe rotary bending forming device comprises a propelling mechanism 1, a pressing mechanism 2, a rotary wheel out-of-plane motion driving mechanism, a rotary wheel in-plane motion driving mechanism and a plurality of rotary wheels 6; the rotating wheel surfaces of the rotating wheels 6 form a rotating wheel group in the same circular plane, the rotating wheel in-plane motion driving mechanism is used for driving each rotating wheel 6 to rotate, revolve and/or move along the radial direction of the circular plane in the circular plane, and the rotating wheel out-of-plane motion driving mechanism 3 is used for driving the circular plane where the rotating wheels 6 are located to move along a certain track, so that the purpose of changing the revolution plane of the rotating wheels 6 is achieved.

The driving mechanism for the internal motion of the rotary wheel comprises a first gear 4 and a second gear 10 meshed with the first gear 4, wherein the first gear 4 is provided with moving chutes 12 the number of which is the same as that of the rotary wheels, the rotary wheels 6 move in the moving chutes 12 along the radial direction of the first gear 4 according to setting, the rotary wheels 6 also keep rotating along self rotating shafts, the center of the first gear 4 is provided with a through hole for the pipe 7 to enter, the second gear 10 drives the first gear 4 to rotate, and each rotary wheel revolves around the pipe 7;

the rotating wheel out-of-plane motion driving mechanism comprises a rotating wheel rotating disk 3 and a worm 11, wherein the first gear 4, the second gear 10 and the rotating wheel are fixedly arranged in a cavity inside the rotating wheel rotating disk 3, the bottom of the rotating wheel rotating disk 3 is provided with a tooth form matched with the worm, and the rotating wheel rotating disk 3 can move along a certain track under the driving of the worm 11, so that the purpose of changing the revolution plane A of the rotating wheel 6 is achieved; as shown in fig. 1, the revolution plane of the rotary wheel 6 can be circularly reciprocated in the progressive deformation zone, and each time the seed process is circularly loaded and returned without load.

The diameter of the through hole arranged in the center of the first gear 4 for the pipe 7 to enter is more than 1.25 times of the diameter of the pipe.

In the device, the number of the rotary wheels 6 is 3, and the included angle between the rotary wheels is 120 degrees.

In the device, the numerical value of the tiny feed quantity delta generated by pushing the tube blank by the pushing mechanism 1 is small compared with the bending radius of the tube blank.

The device also comprises a flexible core mold 8 arranged inside the pipe 7, wherein the radius of the flexible core mold 8 is changed in a certain taper, and the radius of the large end is slightly smaller than that of the pipe blank so that feeding can be smoothly carried out; the flexible core mold 8 passively follows the bending direction and the bending radius of the pipe to generate corresponding deformation and adjustment while supporting the pipe wall without collapse.