阅读说明：本技术 一种镁合金波纹管射流辅助局部差温强旋成形装置及方法 (Jet-assisted local differential temperature forced spinning forming device and method for magnesium alloy corrugated pipe ) 是由 贾伟涛 马立峰 毋嘉豪 赵春江 赵成 林金保 黄志权 于 2019-11-14 设计创作，主要内容包括：本发明属于试验装置技术领域,具体涉及一种镁合金波纹管射流辅助局部差温强旋成形装置和方法。包括安装架、射流液循环系统、温度梯度发生系统、冷却液循环系统、检测控制系统。通过利用高频电脉冲与冷却装置形成镁合金管的局部温度梯度带,又将镁合金管高速旋转,让其获得离心力,同时上下滑板位移差产生一个内部轴向力,再加以镁合金管内部由内冲装置的射流管对其波纹管成形进行辅助作用,即可形成镁合金波纹管。本装置通过上下滑台的相对移动即可完成整个镁合金管的整体多波纹加工,同时还带有一套射流液循环系统与冷却液循环系统,可保证射流液与冷却液的使用温度始终达到要求,实现对温度梯度带精准控制及液体循环利用的目的。(The invention belongs to the technical field of test devices, and particularly relates to a jet-assisted local differential temperature forced spinning forming device and method for a magnesium alloy corrugated pipe. The device comprises a mounting rack, a jet flow liquid circulating system, a temperature gradient generating system, a cooling liquid circulating system and a detection control system. The high-frequency electric pulse and the cooling device are utilized to form a local temperature gradient zone of the magnesium alloy pipe, the magnesium alloy pipe rotates at a high speed to obtain centrifugal force, the displacement difference of the upper sliding plate and the lower sliding plate generates an internal axial force, and the jet pipe of the internal punching device in the magnesium alloy pipe is used for assisting the forming of the corrugated pipe, so that the magnesium alloy corrugated pipe can be formed. This device can accomplish whole many ripples processing of whole magnesium alloy pipe through the relative movement of upper and lower slip table, still has one set of efflux liquid circulation system and coolant liquid circulation system simultaneously, can guarantee that the service temperature of efflux liquid and coolant liquid reaches the requirement all the time, realizes the purpose to temperature gradient area accurate control and liquid cyclic utilization.)

1. A magnesium alloy corrugated pipe jet flow auxiliary local differential temperature forced spinning forming device is characterized by comprising a mounting frame, a jet flow liquid circulating system, a temperature gradient generating system, a cooling liquid circulating system and a detection control system;

an upper rail, a lower rail and a second motor are fixedly arranged on the mounting frame; an upper sliding table is arranged on the upper track in a sliding manner, and a first motor is fixedly arranged on the upper sliding table; a lower sliding table is arranged on the lower track in a sliding manner, and a bearing seat and a motor III are fixedly arranged on the lower sliding table; the upper sliding table is driven by a motor III to move along an upper track; the lower sliding table moves along the lower track under the drive of the second motor;

a jet pipe is arranged on the bearing seat, and a spray head and an annular backflow groove are arranged on the jet pipe; the annular backflow groove is communicated with a liquid return port of the jet pipe; one end of the magnesium alloy pipe is arranged on the bearing seat, and the jet pipe partially extends into the magnesium alloy pipe; the other end of the magnesium alloy pipe is connected with a first motor through a coupling;

the jet liquid circulating system comprises a jet liquid generating device, a jet liquid constant-temperature control box and a jet liquid conveying pump; the jet liquid generating device is communicated with the inlet of the jet pipe; the jet liquid constant temperature control box is communicated with a liquid return port of the jet pipe; the inlet of the jet liquid delivery pump is communicated with the jet liquid constant temperature control box; the outlet of the jet liquid delivery pump is communicated with the jet liquid generating device;

the temperature gradient generation system comprises a first cooling device, a second cooling device and a high-frequency electric pulse induction heating device, wherein the first cooling device and the second cooling device are movably and symmetrically arranged on two sides of the high-frequency electric pulse induction heating device; the magnesium alloy pipe sequentially passes through the first cooling device, the high-frequency electric pulse induction heating device and the second cooling device;

the cooling liquid circulating system comprises a cooling liquid generating device, a cooling liquid constant temperature control box and a cooling liquid delivery pump; the cooling liquid generating device is respectively communicated with the inlet of the first cooling device and the inlet of the second cooling device; the cooling liquid constant temperature control box is respectively communicated with a liquid return port of the first cooling device and a liquid return port of the second cooling device; the inlet of the cooling liquid delivery pump is communicated with the cooling liquid constant temperature control box; the outlet of the cooling liquid delivery pump is communicated with the cooling liquid generating device;

the detection control system is connected with the motor I, the motor II, the motor III, the jet liquid circulating system, the temperature gradient generating system and the cooling liquid circulating system.

2. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming device as claimed in claim 1, wherein the spray heads are radially and uniformly distributed on the jet pipe.

3. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming device as claimed in claim 1, wherein the upper track and the lower track are parallel.

4. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming device as claimed in claim 1, wherein the axes of the cooling liquid flow passages in the first cooling device and the second cooling device, which are in contact with the surface of the magnesium alloy pipe, form acute angles or obtuse angles with the axis of the magnesium alloy pipe.

5. A magnesium alloy corrugated pipe jet flow auxiliary local differential temperature strong rotation forming method comprises the magnesium alloy corrugated pipe jet flow auxiliary local differential temperature strong rotation forming device of any one of claims 1-4, and is characterized in that according to the fact that magnesium alloy shows different plasticity performance at different temperatures, single-ripple non-mode progressive forming is achieved through optimal coupling of a local forming area temperature field and a forming force field, and therefore continuous processing of integral multiple ripples of a magnesium alloy pipe is completed in sequence;

for the non-forming area, the temperature gradient generation system is matched with the cooling liquid circulation system, so that the temperature of the non-forming area is close to room temperature under the condition of ensuring the temperature state of the forming area, the higher yield strength of the alloy is ensured, and deformation does not occur in the corrugation forming process;

on one hand, for the forming area, the local temperature gradient state is controlled through a detection control system, and alloy plastic deformation capacity gradient distribution is formed in the forming area; on the other hand, a forming force greater than the alloy yield strength is applied to the forming zone to locally induce plastic strain, thereby controlling the formed corrugation shape.

6. The magnesium alloy corrugated pipe jet-assisted local differential temperature strong spinning forming method according to claim 5, characterized in that the application of the forming force is realized by the coupling of three parts of force,

a first part: the forming force of the magnesium alloy corrugated pipe is provided by a strong-rotation centrifugal force formed by driving the magnesium alloy pipe to rotate at a high speed through the first motor;

a second part: through the cooperation of a jet fluid circulation system and a jet fluid pipe, the jet impact force of high-pressure and high-temperature fluid is applied to the interior of the magnesium alloy pipe, and the forming force of the magnesium alloy corrugated pipe is provided according to the liquid jet force progressive forming principle;

and a third part: in the process of forming the magnesium alloy corrugated pipe by using a magnesium alloy pipe with a given length, the length of the magnesium alloy pipe is continuously reduced, axial stress is generated in the magnesium alloy pipe, and in order to avoid local thinning defects caused by axial force, a certain axial force is actively applied to the magnesium alloy pipe to provide the forming force of the magnesium alloy corrugated pipe.

7. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming method as claimed in claim 6, wherein the movement speeds of the upper sliding table and the lower sliding table are controlled by the detection control system, and when the movement speed of the lower sliding table is smaller than that of the upper sliding table, the application of axial force to the magnesium alloy pipe can be realized.

8. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming method as claimed in claim 5, wherein the movement speeds of the upper sliding table and the lower sliding table are controlled by the detection control system, and when the upper sliding table and the lower sliding table move in the same direction at the same speed, the selection of the forming position of the magnesium alloy corrugated pipe can be realized.

9. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming method as claimed in claim 5, wherein the length L of the corrugated forming area of the magnesium alloy pipe is controlled by adjusting the installation distance between the first cooling device, the second cooling device and the high-frequency electric pulse induction heating device.

10. The magnesium alloy corrugated pipe jet-assisted local differential temperature forced spinning forming method as claimed in claim 5, characterized in that the local temperature gradient state of the magnesium alloy pipe is controlled by controlling the pulse frequency of the high-frequency electric pulse induction heating device and the injection amount of the cooling liquid through a detection control system.

Technical Field

The invention relates to the field of metal material processing, forming and manufacturing, in particular to a jet-assisted local differential temperature forced spinning forming device and method for a magnesium alloy corrugated pipe.

Background

The metal corrugated pipe is in a regular wave shape, is provided with a radial corrugated and cylindrical thin-wall shell, can be extended or shortened under the action of axial tension or pressure, has the deformation degree in direct proportion to the received external acting force, and can be correspondingly displaced in an axial plane when a radial force generating bending moment is applied to the corrugated pipe, so that the metal corrugated pipe has a great number of applications in many fields. The magnesium alloy corrugated pipe has the characteristics of high specific strength, low density, high rigidity, good shock absorption, good electromagnetic shielding property and the like, and is widely applied to the fields of instruments, aviation, micro motors, petrochemical industry, medical instruments, automobile industry and the like.

For magnesium alloy corrugated pipes, at present, a method of integral multi-process warm forming of pipe fittings is mainly adopted, and the specific common method mainly comprises the following steps:

(1) and performing internal high-pressure warm-hot forming. Placing a straight pipe into a corrugated pipe mold, sealing the end part of the straight pipe, leaving a flow channel through which a liquid medium can be introduced, closing the mold, introducing high-temperature liquid into the pipe, expanding the straight pipe, and finally forming the corrugated pipe;

(2) and (4) mechanical expansion forming. The method mainly aims at the small corrugated pipe, and the specific forming process comprises the steps of sleeving a straight pipe on a mandrel provided with a rubber ring, applying acting force on the mandrel, expanding the pipe by using the acting force of rubber on the straight pipe, and shaping the corrugated outline of the expanded pipe, wherein the corrugation is formed by a single wave at one time;

(3) and (4) spinning and forming. The forming process mainly faces to the large-diameter corrugated pipe, the straight pipe is placed in a forming machine, forming wheels are arranged on the inner side and the outer side of the straight pipe, the forming wheels form a huge die, and the forming is carried out by utilizing the pressure applied to the pipe by the forming wheels on the inner side and the outer side;

(4) and (5) welding and forming. The corrugated pipe with the complex cross-sectional shape is mainly formed by the steps of carrying out indentation rib longitudinal rounding on a plate, and then carrying out coil welding/tailor welding to form the corrugated pipe.

However, when the magnesium alloy corrugated pipe is formed by the conventional method, the production problems of long process flow, complex process, high energy consumption, low efficiency, high cost and the like exist. On one hand, due to the influence of the structural characteristics of the close-packed hexagonal crystal of magnesium, the magnesium alloy has low strength and strong strain, speed and temperature sensitivity of plastic deformation, so that the method for integrally forming the pipe fitting is easy to cause the defects of wall thickness reduction of a non-forming area, nonuniform evolution of structural properties and the like, and further becomes a potential fracture position. On the other hand, due to the strong temperature and deformation sensitivity of the magnesium alloy, the smooth forming of the corrugations strongly depends on the comprehensive coordination of heat and deformation of a forming area, so that the forming condition is high in requirement, and the forming condition is difficult to control accurately due to the strong nonlinearity, the complex dynamic characteristic and the coupling of a multi-process forming process, so that the magnesium alloy corrugated pipe is easy to have the technical problems of poor dimensional precision of the corrugated shape, insufficient local filling of a pipe fitting, serious wall thickness reduction and the like.

Disclosure of Invention

The invention aims to provide a jet flow auxiliary local differential temperature forced spinning forming device for a magnesium alloy corrugated pipe.

In order to achieve the purpose, the invention provides the following technical scheme: a magnesium alloy corrugated pipe jet flow auxiliary local differential temperature forced spinning forming device comprises a mounting frame, a jet flow liquid circulating system, a temperature gradient generating system, a cooling liquid circulating system and a detection control system.

An upper rail, a lower rail and a second motor are fixedly arranged on the mounting frame; an upper sliding table is arranged on the upper track in a sliding manner, and a first motor is fixedly arranged on the upper sliding table; a lower sliding table is arranged on the lower track in a sliding manner, and a bearing seat and a motor III are fixedly arranged on the lower sliding table; the upper sliding table is driven by a motor III to move along an upper track; the lower sliding table moves along the lower track under the drive of the second motor.

A jet pipe is arranged on the bearing seat, and a spray head and an annular backflow groove are arranged on the jet pipe; the annular backflow groove is communicated with a liquid return port of the jet pipe; one end of the magnesium alloy pipe is arranged on the bearing seat, and the jet pipe partially extends into the magnesium alloy pipe; the other end of the magnesium alloy pipe is connected with the first motor through a coupling.

The jet liquid circulating system comprises a jet liquid generating device, a jet liquid constant-temperature control box and a jet liquid conveying pump; the jet liquid generating device is communicated with the inlet of the jet pipe; the jet liquid constant temperature control box is communicated with a liquid return port of the jet pipe; the inlet of the jet liquid delivery pump is communicated with the jet liquid constant temperature control box; the outlet of the jet liquid delivery pump is communicated with the jet liquid generating device.

The temperature gradient generation system comprises a first cooling device, a second cooling device and a high-frequency electric pulse induction heating device, wherein the first cooling device and the second cooling device are movably and symmetrically arranged on two sides of the high-frequency electric pulse induction heating device; the magnesium alloy pipe sequentially passes through the first cooling device, the high-frequency electric pulse induction heating device and the second cooling device.

The cooling liquid circulating system comprises a cooling liquid generating device, a cooling liquid constant temperature control box and a cooling liquid delivery pump; the cooling liquid generating device is respectively communicated with the inlet of the first cooling device and the inlet of the second cooling device; the cooling liquid constant temperature control box is respectively communicated with a liquid return port of the first cooling device and a liquid return port of the second cooling device; the inlet of the cooling liquid delivery pump is communicated with the cooling liquid constant temperature control box; the outlet of the cooling liquid delivery pump is communicated with the cooling liquid generating device.

The detection control system is connected with the motor I, the motor II, the motor III, the jet liquid circulating system, the temperature gradient generating system and the cooling liquid circulating system.

Furthermore, the spray heads are uniformly distributed on the jet pipe in the radial direction.

Further, the upper track and the lower track are parallel.

Furthermore, the axes of the cooling liquid flow passages in the first cooling device and the second cooling device, which are in contact with the surface of the magnesium alloy pipe, form acute angles or obtuse angles with the axis of the magnesium alloy pipe.

The invention also aims to provide a jet-assisted local differential temperature forced spinning forming method for the magnesium alloy corrugated pipe.

In order to achieve the purpose, the invention provides the following technical scheme: a jet-assisted local differential temperature forced spinning forming method for a magnesium alloy corrugated pipe is characterized in that by applying the jet-assisted local differential temperature forced spinning forming device for the magnesium alloy corrugated pipe, single-ripple dieless progressive forming is realized through optimal coupling of a local forming area temperature field and a forming force field according to different plasticity performances of magnesium alloy at different temperatures, so that continuous processing of integral multiple ripples of the magnesium alloy pipe is sequentially completed;

for the non-forming area, the temperature gradient generation system is matched with the cooling liquid circulation system, so that the temperature of the non-forming area is close to room temperature under the condition of ensuring the temperature state of the forming area, the higher yield strength of the alloy is ensured, and deformation does not occur in the corrugation forming process;

on one hand, for the forming area, the local temperature gradient state is controlled through a detection control system, and alloy plastic deformation capacity gradient distribution is formed in the forming area; on the other hand, a forming force greater than the alloy yield strength is applied to the forming zone to locally induce plastic strain, thereby controlling the formed corrugation shape.

Further, the application of the forming force is realized by the coupling of three parts of force,

a first part: the forming force of the magnesium alloy corrugated pipe is provided by a strong-rotation centrifugal force formed by driving the magnesium alloy pipe to rotate at a high speed through the first motor;

a second part: through the cooperation of a jet fluid circulation system and a jet fluid pipe, the jet impact force of high-pressure and high-temperature fluid is applied to the interior of the magnesium alloy pipe, and the forming force of the magnesium alloy corrugated pipe is provided according to the liquid jet force progressive forming principle;

and a third part: for a section of magnesium alloy pipe with a given length, the length of the magnesium alloy pipe is continuously reduced in the process of forming the magnesium alloy corrugated pipe, axial stress can be generated in the material, in order to avoid the defect of local thinning caused by the axial force, a certain axial force is actively applied to the magnesium alloy pipe to provide the forming force of the magnesium alloy corrugated pipe, a part or all of the axial stress action is counteracted, the direction of the axial force is directed from two ends of the magnesium alloy pipe to the middle, the magnitude of the axial force is controlled at the same time, and the effect of assisting the forming of the corrugated pipe is achieved. The forming cost of the magnesium alloy corrugated pipe can be greatly reduced, and the forming efficiency and precision of the magnesium alloy corrugated pipe can be improved.

Furthermore, the movement speeds of the upper sliding table and the lower sliding table are controlled through the detection control system, and when the movement speed of the lower sliding table is smaller than that of the upper sliding table, the application of axial force on the magnesium alloy pipe can be realized.

Furthermore, the movement speeds of the upper sliding table and the lower sliding table are controlled by the detection control system, and when the upper sliding table and the lower sliding table move in the same direction at the same speed, the selection of the corrugated forming position of the magnesium alloy pipe can be realized.

Furthermore, the length L of the corrugated forming area of the magnesium alloy pipe is controlled by adjusting the installation distance between the first cooling device, the second cooling device and the high-frequency electric pulse induction heating device.

Furthermore, the detection control system controls the pulse frequency of the high-frequency electric pulse induction heating device and the injection quantity of the cooling liquid to control the local temperature gradient state of the magnesium alloy pipe.

The invention has the following technical effects: the whole multi-corrugation processing of the whole magnesium alloy pipe can be completed through the relative movement of the upper sliding table and the lower sliding table, and meanwhile, a set of jet liquid circulating system and a set of cooling liquid circulating system are further arranged, so that the use temperature of the jet liquid and the cooling liquid can be guaranteed to meet the requirement all the time, and the purposes of accurate control of a temperature gradient zone and liquid cyclic utilization are achieved. Solves the production problems of long process flow, complex working procedures, large energy consumption, low efficiency, high cost, low precision and the like in the prior art.

Drawings

FIG. 1 is a front view of the structure of the apparatus of the present invention in example 1;

FIG. 2 is a top view of the structure of the apparatus of the present invention in example 1;

FIG. 3 is a rear view showing the structure of the apparatus of the present invention in example 1;

fig. 4 is a schematic view showing the installation of the jet pipe and the installation of the head of the present invention in example 1;

FIG. 5 is a schematic view showing the structure of a cooling apparatus of the present invention in example 1;

FIG. 6 is a temperature gradient trend chart of the present invention;

FIG. 7 is a schematic view of a magnesium alloy tube forming section according to the present invention.

Reference numerals: 1. a mounting frame; 2. an upper rail; 3. a jet pipe; 4. a bearing seat; 5. a magnesium alloy tube; 6. an upper sliding table; 7. a coupling; 8. a first motor; 9. a lower rail; 10. a lower sliding table; 11. a second motor; 12. a constant temperature control box for the jet liquid; 13. a jet fluid delivery pump; 14. a jet fluid generating device; 15. a first cooling device; 16. a third motor; 17. a second cooling device; 18. a high-frequency electric pulse induction heating device; 19. a coolant generating device; 20. a coolant delivery pump; 21. a coolant constant temperature control box; 22. detecting a control system; 23. and (4) a spray head.

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.