CN114011892B - Temperature-speed-controllable ultrasonic vibration-assisted thin-wall capillary drawing forming device and method - Google Patents
Temperature-speed-controllable ultrasonic vibration-assisted thin-wall capillary drawing forming device and method Download PDFInfo
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- CN114011892B CN114011892B CN202111271092.3A CN202111271092A CN114011892B CN 114011892 B CN114011892 B CN 114011892B CN 202111271092 A CN202111271092 A CN 202111271092A CN 114011892 B CN114011892 B CN 114011892B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C9/00—Cooling, heating or lubricating drawing material
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Abstract
The invention belongs to the field of thin-wall capillary forming, and particularly discloses a temperature-controllable and speed-controllable ultrasonic vibration-assisted thin-wall capillary drawing forming device and a method, wherein the device comprises an ultrasonic assembly, a temperature-controllable assembly and a speed-controllable assembly, the upper end of the ultrasonic assembly is provided with a wire drawing die, and the wire drawing die is provided with an annular groove; an axial through hole is formed in the ultrasonic assembly, and the capillary to be drawn penetrates through the axial through hole and the wire drawing die; the temperature control assembly comprises a precooling fluid pipe, a temperature adjusting fluid pipe, an electric heating wire and a temperature sensor, the precooling fluid pipe is inserted into the axial through hole, the temperature adjusting fluid pipe is inserted into the annular groove, the electric heating wire is installed in the wire drawing die, and the temperature sensor is installed on the wire drawing die; the speed control assembly comprises a roller disc and an ultrasonic thickness gauge, the ultrasonic thickness gauge is used for detecting the wall thickness of the capillary after being drawn, and the roller disc is used for clamping the capillary from the upper end to be drawn. The drawing forming device provided by the invention can obtain the thin-wall capillary tube with small wall thickness and high surface quality, dimensional accuracy and strength.
Description
Technical Field
The invention belongs to the field of thin-wall capillary tube forming, and particularly relates to a temperature-controllable and speed-controllable ultrasonic vibration-assisted thin-wall capillary tube drawing forming device and method.
Background
The thin-wall capillary tube has very wide application in the refrigeration industry, the wall thickness of the capillary tube can directly influence the heat transfer efficiency, and the thinner the wall thickness is, the higher the heat transfer efficiency is.
Compared with the conventional plastic forming process, the ultrasonic vibration assisted plastic forming technology can effectively reduce the forming force of the material and improve the forming performance of the capillary tube to a certain extent. However, when the wall thickness of the capillary is less than 100. mu.m, the strength, surface quality and dimensional accuracy of the capillary after drawing formation are still low. Therefore, the existing drawing method and apparatus have been unable to meet the demand for thin-walled capillaries with small wall thickness, good surface quality, and high dimensional accuracy and strength.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a temperature-controllable and speed-controllable ultrasonic vibration-assisted thin-wall capillary tube drawing forming device and method, and aims to pre-cool a thin-wall capillary tube before drawing and control the drawing environment temperature by designing a temperature control assembly, so that the thin-wall capillary tube with small wall thickness, good surface quality, high dimensional accuracy and high strength is obtained by drawing.
In order to achieve the above object, according to an aspect of the present invention, a temperature-controllable and speed-controllable ultrasonic vibration assisted thin-walled capillary drawing forming apparatus is provided, including an ultrasonic component, a temperature-controlling component and a speed-controlling component, wherein:
the upper end of the ultrasonic component is provided with a wire drawing die, and the wire drawing die is provided with an annular groove; an axial through hole is formed in the ultrasonic assembly, and a capillary to be drawn penetrates through the axial through hole and the wire drawing die;
the temperature control assembly comprises a precooling fluid pipe, a temperature adjusting fluid pipe, an electric heating wire and a temperature sensor, wherein the precooling fluid pipe is inserted into the axial through hole and is used for precooling the capillary tube to be drawn; the temperature regulating fluid pipe is inserted into the annular groove, and the electric heating wire is installed in the wire drawing die; the temperature sensor is arranged on the wire drawing die and used for detecting the ambient temperature, adjusting the flow of the temperature adjusting fluid pipe and the power of the electric heating wire according to the ambient temperature and controlling the drawing ambient temperature to reach the target temperature;
the speed control assembly comprises a roller disc and an ultrasonic thickness gauge, the ultrasonic thickness gauge is used for detecting the wall thickness of the capillary after being drawn, the roller disc is used for clamping the capillary from the upper end to draw, and the drawing speed is adjusted according to the wall thickness measured by the ultrasonic thickness gauge.
As a further preferred feature, the temperature control assembly further includes a liquid nitrogen tank, and the liquid nitrogen tank is communicated with the pre-cooling fluid pipe and the temperature-adjusting fluid pipe; the automatic pressurization loop comprises a vaporizer and a self-pressurization regulating valve, so that liquid nitrogen is led out from the bottom of the liquid nitrogen tank and returns to the upper part of the liquid nitrogen tank after passing through the vaporizer and the self-pressurization regulating valve.
Preferably, one end of the pre-cooling fluid pipe is connected with the liquid nitrogen tank, the other end of the pre-cooling fluid pipe is closed, and a plurality of atomizing nozzles are uniformly distributed on the pre-cooling fluid pipe.
Further preferably, a vaporizer is provided in the temperature-adjusting fluid pipe.
Preferably, the wire drawing die is provided with an auxiliary screw cap, the auxiliary screw cap is provided with three holes, the holes on two sides are respectively used for connecting the temperature regulating fluid pipe and the balance air pressure, and the hole in the middle is used for penetrating the capillary to be drawn.
Preferably, four ultrasonic thickness gauges in different directions are mounted in the middle of the auxiliary spiral cover and used for measuring the wall thickness of the capillary tube after drawing from different directions, and the rotating speed of the roller disc during drawing is regulated and controlled according to the difference value between the maximum wall thickness and the minimum wall thickness.
As a further preferred, the ultrasonic assembly comprises an ultrasonic transducer and a horn arranged at the upper end of the ultrasonic transducer, a circular groove is arranged at the top of the horn, and the wire drawing die is installed in the circular groove.
Preferably, the circumference of the amplitude transformer is provided with external threads, the inner side of the auxiliary screw cap is provided with internal threads matched with the external threads of the amplitude transformer, and the wire drawing die is screwed and fixed through threads to form rigid connection.
According to another aspect of the invention, a temperature-controlled speed-controlled ultrasonic vibration-assisted thin-wall capillary drawing forming method is provided, which is realized by adopting the device, and comprises the following steps:
s1, the capillary to be formed sequentially passes through the axial through hole and the wire drawing die, and the upper end of the capillary is clamped by the roller disc;
s2, inputting cooling fluid into the axial through hole through a precooling fluid pipe, and precooling the capillary to be formed;
s3, inputting cooling fluid into the annular groove through the temperature-regulating fluid pipe, and simultaneously opening the electric heating wire; detecting the temperature of the wire drawing die, namely the drawing environment temperature through a temperature sensor, adjusting the flow of cooling fluid and the power of an electric heating wire according to the environment temperature, and controlling the drawing environment temperature to reach the target temperature;
s4, sequentially opening the ultrasonic assembly and the roller disc, and drawing the capillary tube by rotating the roller disc; and measuring the wall thickness of the capillary after drawing forming by using an ultrasonic thickness gauge, and adjusting the drawing speed according to the measured wall thickness until the drawing forming of the capillary is finished.
Preferably, the wall thickness of different circumferential positions of the capillary tube after drawing forming is measured by an ultrasonic thickness gauge, and when the difference value between the detected maximum wall thickness and the detected minimum wall thickness is greater than a set value, the drawing speed is slowed down; otherwise, the current drawing speed is maintained.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. according to the invention, by designing the temperature control assembly, the thin-wall capillary tube is precooled before drawing, and meanwhile, the drawing environment temperature is controlled, so that on one hand, drawing forming can be carried out in a low-temperature environment, the strength of the formed material is obviously improved, and on the other hand, the environment temperature is higher than the solidifying point of a lubricant between a wire drawing die and the capillary tube through temperature control, so that the lubricant is prevented from being solidified, the smoothness of the drawing process is ensured, and the quality and the size precision of the capillary tube are improved; thereby obtaining the thin-wall capillary tube with small wall thickness, high surface quality, dimensional accuracy and strength, and being particularly suitable for drawing and forming the capillary tube with the wall thickness less than 100 mu m.
2. According to the invention, the actual environment temperature and the wall thickness of the drawn capillary tube are respectively detected by the temperature sensor and the ultrasonic thickness gauge, so that the flow of the cooling fluid, the power of the electric heating wire and the rotating speed of the roller disc during drawing can be adjusted in real time, the problems of fracture failure and the like are prevented, and intelligent control is realized.
3. The liquid nitrogen provided by the liquid nitrogen tank is used as cooling fluid, the automatic pressurization loop is additionally arranged, and the vaporizer is used for vaporizing the liquid nitrogen by utilizing environmental heat leakage, so that the pressure in the liquid nitrogen tank is increased to provide power for conveying the liquid nitrogen.
4. One end of the pre-cooling fluid pipe designed by the invention is connected with the liquid nitrogen tank, the other end of the pre-cooling fluid pipe is closed, and the plurality of atomizing nozzles are uniformly distributed, so that the capillary can be pre-cooled uniformly in advance before pipe drawing.
5. The ultrasonic vibration assisted plastic forming adopted by the invention can effectively reduce the forming force of the material, and simultaneously further adjusts the amplitude through the amplitude transformer and realizes the energy-gathering effect, thereby reducing the friction between the die and the material, improving the surface quality and the dimensional accuracy of the part, improving the forming limit of the material and improving the forming performance of the material.
Drawings
FIG. 1 is a schematic structural diagram of a temperature-controllable speed-controllable ultrasonic vibration-assisted thin-walled capillary tube drawing forming device according to an embodiment of the present invention;
FIG. 2 is a top view of an auxiliary spin-cap in accordance with an embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-ultrasonic transducer, 2-amplitude transformer, 3-wire drawing die, 4-electric heating wire, 5-temperature sensor, 6-auxiliary screw cap, 7-ultrasonic thickness gauge, 8-bracket, 9-liquid nitrogen tank, 10-self-pressurization regulating valve, 11, 17-vaporizer, 12, 13-infusion valve, 14-manual pressure relief valve, 15-temperature regulating fluid pipe, 16-precooling fluid pipe, 18-roller disc, 19-computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The temperature-controllable and speed-controllable ultrasonic vibration-assisted thin-wall capillary drawing forming device provided by the embodiment of the invention comprises a bracket 8, an ultrasonic assembly, a temperature control assembly, a speed control assembly and a computer 19, as shown in fig. 1, wherein:
the ultrasonic assembly comprises an ultrasonic transducer 1, the ultrasonic transducer 1 is used for converting a high-frequency electric oscillation signal input by an ultrasonic generator into mechanical vibration, and the maximum amplitude of the provided ultrasonic vibration is concentrated on a wire drawing die 3; the upper end of the ultrasonic transducer 1 is provided with an amplitude transformer 2, the top of the amplitude transformer 2 is provided with a circular groove, and the circular groove is used for accommodating a wire drawing die 3; the periphery of the amplitude transformer 2 is provided with external threads, the middle part of the amplitude transformer 2 is provided with a flange plate, and the amplitude transformer 2 is fixedly arranged on the bracket 8 through bolts and the flange plate; axial through holes are formed in the ultrasonic transducer 1 and the amplitude transformer 2, a capillary to be formed penetrates through the axial through holes and the wire drawing die 3, the upper end of the capillary is clamped by the roller disc 18, and the roller is rotated by the roller disc 18 to complete drawing forming.
Specifically, an annular groove is formed in the middle of the wire drawing die 3, an auxiliary screw cap 6 is mounted on the wire drawing die 3, an internal thread matched with the external thread of the amplitude transformer 2 is arranged on the inner side of the auxiliary screw cap 6, and the wire drawing die 3 is screwed and fixed through threads to form rigid connection. The wire drawing die 3 can be replaced at any time, capillaries with different pipe diameters can be formed by changing the size of the inner diameter, and the universality is strong. The auxiliary spiral cover 6 is provided with three cylindrical holes, as shown in fig. 2, wherein the holes at two sides are respectively used for connecting the temperature-adjusting fluid pipe 15 and the equilibrium air pressure, and the hole at the middle is used for penetrating the capillary to be drawn.
The temperature control assembly comprises a liquid nitrogen tank 9, two liquid nitrogen delivery pipes, an electric heating wire 4 and a temperature sensor 5, wherein the two liquid nitrogen delivery pipes are a pre-cooling fluid pipe 16 and a temperature adjusting fluid pipe 15 which are respectively connected with the liquid nitrogen tank 9 through a fluid delivery valve 13 and a fluid delivery valve 12, and the electric heating wire is arranged in the wire drawing die 3; specifically, one end of the precooling fluid pipe 16 is connected with the liquid nitrogen tank 9, the other end of the precooling fluid pipe is closed, meanwhile, a manual pressure release valve 14 is arranged on one side of the precooling fluid pipe 16 close to the liquid nitrogen tank 9, and a plurality of atomizing nozzles are uniformly distributed on one side extending into the axial through hole; the temperature adjusting fluid pipe 15 is inserted into the annular groove, and a vaporizer 17 is arranged on the temperature adjusting fluid pipe; the temperature sensor 5 is installed on the wire drawing die 3 and used for detecting the ambient temperature.
Specifically, the left side of the liquid nitrogen tank 9 is provided with an automatic pressurization loop, and the automatic pressurization loop comprises a vaporizer 11 and a self-pressurization regulating valve 10, so that liquid nitrogen is led out from the bottom of the liquid nitrogen tank 9 and forms a liquid-gas mixture to return to the upper part of the liquid nitrogen tank 9 after passing through the vaporizer 11 and the self-pressurization regulating valve 10. The automatic pressurization loop is led out from the bottom of the liquid nitrogen tank 9, passes through the vaporizer 11 and the self-pressurization regulating valve 10 and then returns to the upper part of the liquid nitrogen tank. The vaporizer 11 vaporizes the liquid nitrogen by utilizing environmental heat leakage, so that the pressure in the liquid nitrogen tank is increased to provide power for conveying the liquid nitrogen; the pressure in the liquid nitrogen tank can be adjusted by adjusting the self-pressurization regulating valve 10 and the manual pressure relief valve 14. When the pressure in the liquid nitrogen tank 9 is higher than the atmospheric pressure, the liquid nitrogen flows into the groove of the wire drawing die and the through hole of the amplitude transformer through the liquid nitrogen delivery pipe by opening the liquid delivery valve 12 and the liquid delivery valve 13.
The speed control assembly comprises a roller disc 18 and an ultrasonic thickness gauge 7, and the roller disc 18 is used for clamping the capillary tube from the upper end for drawing; the ultrasonic thickness gauges 7 are arranged in four directions, through which the capillary tube penetrates, in the middle of the auxiliary spiral cover 6, the ultrasonic thickness gauges 7 are used for measuring the wall thickness of the drawn capillary tube from different directions, and the rotating speed of the roller disc 18 during drawing is regulated and controlled according to the wall thickness.
The computer 19 is connected with the ultrasonic thickness gauge 7 and the roller disc 18, and the rotating speed of the roller disc 18 is intelligently controlled by monitoring wall thickness data measured by the ultrasonic thickness gauge 7; the computer 19 is also connected with the temperature sensor 5, the electric heating wire 4 and the infusion valve, and is used for controlling the flow of the infusion valve and the power of the electric heating wire 4 according to the ambient temperature measured by the temperature sensor 5 so as to keep the temperature constant.
The thin-wall capillary tube drawing forming device is assisted by the temperature-controllable and speed-controllable ultrasonic vibration to carry out thin-wall capillary tube drawing forming, and comprises the following steps:
step one, pricking one end of a capillary tube and then penetrating the capillary tube through an axial through hole and a wire drawing die 3;
step two, clamping one end of the capillary prick through a roller disc 18;
step three, closing the infusion valve 12, the infusion valve 13 and the manual pressure relief valve 14, opening the self-pressurization regulating valve 10, vaporizing liquid nitrogen in the liquid nitrogen tank 9 through a vaporizer to form a liquid-gas mixture, and allowing the liquid-gas mixture to enter the upper part of the liquid nitrogen tank 9 through the self-pressurization regulating valve 10, so that the pressure in the liquid nitrogen tank 9 is increased;
step four, opening the infusion valve 13, and precooling the thin-wall capillary tube by liquid nitrogen through the precooling fluid tube 16 and the infusion valve 13;
step five, opening the infusion valve 12, enabling the liquid nitrogen to form an atomized liquid nitrogen and nitrogen mixture through the temperature-adjusting fluid pipe 15, the infusion valve 12 and the vaporizer 17, enabling the atomized liquid nitrogen and nitrogen mixture to enter the wire drawing die, enabling the wire drawing die to be cooled more uniformly through the liquid nitrogen and nitrogen mixture, and enabling the temperature to reach the target temperature through controlling the infusion valve and the electric heating wire; specifically, the temperature of the wire drawing die, namely the actual drawing environment temperature, is detected through the temperature sensor 5, the flow of the cooling fluid and the power of the electric heating wire are adjusted according to the actual environment temperature, and the drawing environment temperature is controlled to reach the target temperature.
Step six, turning on a power supply of the ultrasonic assembly;
and step seven, starting the roller disc 18, performing capillary drawing forming, measuring the wall thickness of the capillary after the capillary is drawn and formed by the four ultrasonic thickness gauges 7 in different directions in the drawing process, controlling the drawing speed of the roller disc 18 according to the difference value of the measured maximum wall thickness and the measured minimum wall thickness, specifically, when a defect is detected or the difference value of the maximum wall thickness and the minimum wall thickness is greater than a set value, slowing down the drawing speed to prevent the problems of fracture failure and the like, otherwise, keeping the current preset drawing speed until the capillary drawing forming is completed.
In the embodiment, a piezoelectric ceramic ultrasonic transducer is adopted to convert a daily used 220V alternating current power supply into an ultrasonic frequency oscillation electric signal with the amplitude of 5-10 μm, wherein the ultrasonic frequency oscillation electric signal is 20 KHZ; the diameter of the tube blank is 1mm, the wall thickness is 50 mu m, and the material is GH4169 high-temperature alloy; the wire drawing die has an outer diameter of 20mm and a height of 6mm, and is made of artificial polycrystalline diamond.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a supplementary thin wall capillary drawing forming device of fast ultrasonic vibration of controllable temperature control which characterized in that, includes supersound subassembly, temperature control component and the fast subassembly of accuse, wherein:
the upper end of the ultrasonic component is provided with a wire drawing die (3), and the wire drawing die (3) is provided with an annular groove; an axial through hole is formed in the ultrasonic assembly, and the capillary to be drawn penetrates through the axial through hole and the wire drawing die (3);
the temperature control assembly comprises a precooling fluid pipe (16), a temperature adjusting fluid pipe (15), an electric heating wire (4) and a temperature sensor (5), wherein the precooling fluid pipe (16) is inserted into the axial through hole and is used for precooling the capillary tube to be drawn; the temperature-adjusting fluid pipe (15) is inserted into the annular groove, and the electric heating wire (4) is installed in the wire drawing die (3); the temperature sensor (5) is arranged on the wire drawing die (3) and used for detecting the ambient temperature and adjusting the flow of the temperature adjusting fluid pipe (15) and the power of the electric heating wire (4) according to the ambient temperature;
the speed control assembly comprises a roller disc (18) and an ultrasonic thickness gauge (7), the ultrasonic thickness gauge (7) is used for detecting the wall thickness of the capillary after drawing, the roller disc (18) is used for clamping the capillary from the upper end to draw, and the drawing speed is adjusted according to the wall thickness measured by the ultrasonic thickness gauge (7).
2. The device for drawing and forming the thin-wall capillary tube with the assistance of the ultrasonic vibration at the controllable temperature and the controllable speed as claimed in claim 1, wherein the temperature control assembly further comprises a liquid nitrogen tank (9), and the liquid nitrogen tank (9) is communicated with the pre-cooling fluid pipe (16) and the temperature-adjusting fluid pipe (15); the automatic pressurization loop is arranged on the liquid nitrogen tank (9) and comprises a vaporizer (11) and a self-pressurization regulating valve (10), so that liquid nitrogen is led out from the bottom of the liquid nitrogen tank (9) and returns to the upper part of the liquid nitrogen tank (9) after passing through the vaporizer (11) and the self-pressurization regulating valve (10).
3. The temperature-controllable speed-controllable ultrasonic vibration-assisted thin-wall capillary tube drawing forming device as claimed in claim 2, wherein one end of the pre-cooling fluid pipe (16) is connected with the liquid nitrogen tank (9), the other end is closed, and a plurality of atomizing nozzles are uniformly distributed on the pre-cooling fluid pipe (16).
4. The device for drawing and forming the thin-walled capillary tube with the assistance of the ultrasonic vibration at the controllable temperature and the controllable speed according to claim 2, characterized in that a vaporizer (17) is arranged on the temperature adjusting fluid pipe (15).
5. The drawing forming device of the thin-wall capillary tube assisted by ultrasonic vibration with controllable temperature and speed according to any one of claims 1 to 4, characterized in that the drawing die (3) is provided with an auxiliary screw cap (6), the auxiliary screw cap (6) is provided with three holes, wherein the holes at two sides are respectively used for connecting the temperature-adjusting fluid pipe (15) and the balance air pressure, and the hole at the middle is used for penetrating the capillary tube to be drawn.
6. The drawing forming device of the thin-wall capillary tube assisted by ultrasonic vibration with the controllable temperature and speed as claimed in claim 5, characterized in that four ultrasonic thickness gauges (7) with different directions are installed in the middle of the auxiliary spiral cover (6) and are used for measuring the wall thickness of the capillary tube after drawing from different directions and regulating and controlling the rotating speed of the roller disc (18) during drawing according to the difference value between the maximum wall thickness and the minimum wall thickness.
7. The device for drawing and forming the thin-wall capillary tube with the assistance of the ultrasonic vibration at the controlled temperature and the controlled speed as claimed in claim 5, wherein the ultrasonic assembly comprises an ultrasonic transducer (1) and an amplitude transformer (2) arranged at the upper end of the ultrasonic transducer (1), a circular groove is formed at the top of the amplitude transformer (2), and the wire drawing die (3) is installed in the circular groove.
8. The temperature-controlled speed-controlled ultrasonic vibration assisted thin-wall capillary drawing forming device as claimed in claim 7, wherein external threads are arranged on the periphery of the amplitude transformer (2), internal threads matched with the external threads of the amplitude transformer (2) are arranged on the inner side of the auxiliary rotary cover (6), and the wire drawing die (3) is screwed and fixed through threads to form rigid connection.
9. A temperature-controlled and speed-controlled ultrasonic vibration assisted thin-walled capillary drawing forming method is realized by the device of any one of claims 1 to 8, and is characterized by comprising the following steps:
s1, the capillary to be formed sequentially passes through the axial through hole and the wire drawing die (3), and the upper end of the capillary is clamped by the roller disc (18);
s2, inputting cooling fluid into the axial through hole through a precooling fluid pipe (16), and precooling the capillary to be formed;
s3, inputting cooling fluid into the annular groove through the temperature-regulating fluid pipe (15), and simultaneously opening the electric heating wire (4); the temperature of the wire drawing die (3), namely the drawing environment temperature, is detected through a temperature sensor (5), the flow of cooling fluid and the power of an electric heating wire are adjusted according to the environment temperature, and the drawing environment temperature is controlled to reach the target temperature;
s4, sequentially starting the ultrasonic assembly and the roller disc (18), and drawing the capillary tube by rotating the roller disc (18); and measuring the wall thickness of the capillary after drawing forming by an ultrasonic thickness gauge (7), and adjusting the drawing speed according to the measured wall thickness until the drawing forming of the capillary is completed.
10. The drawing forming method of the thin-walled capillary tube assisted by ultrasonic vibration with controllable temperature and speed as claimed in claim 9, characterized in that the wall thickness of the capillary tube at different circumferential positions after drawing forming is measured by an ultrasonic thickness gauge (7), and when the difference between the detected maximum wall thickness and the detected minimum wall thickness is greater than a set value, the drawing speed is slowed down; otherwise, the current drawing speed is maintained.
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| CN110227728A (en) * | 2019-06-14 | 2019-09-13 | 北京航空航天大学 | A kind of tubular property regulation device of ultrasonic vibration assisted with high-temperature alloy thin-wall capillary |
| CN210647764U (en) * | 2019-09-16 | 2020-06-02 | 苏州远望光学有限公司 | Cooling drawing equipment for steel wire |
| CN112287585A (en) * | 2020-11-04 | 2021-01-29 | 北京航空航天大学 | Thermoelectric indirect coupling simulation method for thin-wall capillary tube electric-assisted drawing forming |
| CN112934995A (en) * | 2021-02-01 | 2021-06-11 | 中国航空制造技术研究院 | Preparation method and system of alloy capillary tube |
| CN113083922A (en) * | 2021-03-22 | 2021-07-09 | 西北工业大学 | Induction heating auxiliary drawing device for preparing capillary tube |
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