CN107245675B - A kind of ultrasonic unit and preparation method thereof preparing carbon fiber aluminum-based compound material - Google Patents

Abstract

The invention relates to an ultrasonic device for preparing carbon fiber aluminum-based composite materials, including a servo system, an ultrasonic vibration system, a cooling system and a gas protection system. A metal rod is connected to the lower end of the servo system, and a connecting piece is connected to the lower end of the metal rod. There is an ultrasonic vibration system and a gas protection system. The crucible is placed inside the gas protection device. The circumference of the ultrasonic horn is equipped with an annular cooling device. One side of the ultrasonic vibration system is equipped with a lifting motor, and the lower end of the lifting motor is connected to a bow. Fixture, this equipment has high cooling efficiency, improves the dispersion degree of carbon fiber in molten metal, reduces the time required for carbon fiber dispersion, thereby reducing carbon fiber damage and obtaining high-quality carbon fiber metal matrix composites.

Description

An ultrasonic device for preparing carbon fiber aluminum matrix composite material and its preparation method

technical field

The invention belongs to the field of material equipment, and relates to a device and a preparation method for shortening the preparation cycle and reducing the degree of carbon fiber damage during the preparation of metal matrix composite materials, and specifically refers to an ultrasonic device for preparing continuous carbon fiber aluminum matrix composite materials and a preparation method thereof.

Background technique

The preparation of continuous carbon fiber metal matrix composites by ultrasonic vibration method utilizes the cavitation effect and acoustic flow effect generated by ultrasonic waves. It is a process for preparing carbon fiber metal matrix composites by acting on carbon fibers to uniformly disperse carbon fibers. The integrity of carbon fiber and the degree of dispersion of carbon fiber in the melt during the preparation of carbon fiber composites seriously affect the mechanical properties of carbon fiber composites. When conventional carbon fiber metal matrix composites are prepared, the contact time between carbon fibers and molten metal is long, the damage of carbon fibers is large, and the degree of dispersion of carbon fibers in molten metal is poor. The preparation of continuous carbon fiber metal matrix composites by ultrasonic vibration can greatly shorten the contact time between carbon fibers and molten metal. , reduce the impact force on the carbon fiber, and ensure the integrity of the carbon fiber to a great extent. At the same time, the ultrasonic wave is used to evenly disperse the carbon fiber to achieve the purpose of improving the mechanical properties of the carbon fiber metal matrix composite. At present, because the ultrasonic vibration head cannot be used under the condition of greater than 120°C, and it cannot be used in the metal smelting process for a long time due to metal heat conduction and heat radiation, etc., an experimental device is needed to solve these problems.

SUMMARY OF THE INVENTION

Purpose of the invention:

The invention provides an ultrasonic device and a preparation method for preparing continuous carbon fiber metal matrix composite materials. The cooling efficiency of the equipment is high, which changes the current situation that carbon fiber and metal liquid are in contact for a long time and carbon fiber damage is large during the preparation of carbon fiber metal matrix composite materials. The degree of dispersion in the metal liquid reduces the time required for carbon fiber dispersion, thereby reducing carbon fiber damage and obtaining high-quality carbon fiber metal matrix composites.

Technical solutions:

An ultrasonic device for preparing carbon fiber aluminum-based composite materials, including a servo system, an ultrasonic vibration system, a cooling system and a gas protection system, is characterized in that a metal rod is connected to the lower end of the servo system, a motor is installed inside the servo system, and the lower end of the metal rod is connected to There is a connecting piece, the lower end of the connecting piece is connected with an ultrasonic transducer, the lower end of the ultrasonic transducer is connected with an ultrasonic horn, and the lower end of the ultrasonic horn is connected with an ultrasonic vibration head, and the ultrasonic transducer is also connected with an ultrasonic transducer through a signal line. Generator, ultrasonic generator, ultrasonic transducer, ultrasonic horn and ultrasonic vibration head are combined to form an ultrasonic vibration system. The lower part of the ultrasonic vibration system is equipped with a melting and holding furnace, and a gas protection device is installed inside the furnace cavity. The crucible is placed in a gas protection device. Inside the device, the circumference of the ultrasonic horn is provided with an annular cooling device, the upper end of the annular cooling device is connected with an air guide tube, and the air guide tube is also connected with a high-pressure gas storage device and a gas protection device, the air guide tube, the high-pressure gas storage device A cooling system is formed with an annular cooling device, and a gas protection system is formed by a gas protection device, an air guide tube and a high-pressure gas storage device. A lifting motor is arranged on one side of the ultrasonic vibration system, and a bow-shaped clamp is connected to the lower end of the lifting motor.

The connecting piece is a connecting piece with a circumferential thread, and is fixed with the metal rod and the ultrasonic transducer through a threaded buckle.

The annular cooling device is in the shape of a ring-like "spring" spiral, the upper part is vertically upward, and the lower end is closed, and is full of round holes facing the direction of the ultrasonic horn.

The diameter of the circular hole is 1-4mm.

Holes are provided on the inner side of the gas protection device.

The inside of the gas protection device is hollow and has a hole structure, and the size of the holes gradually becomes larger as the height increases.

The bow-shaped clamp has a certain pre-tightening force.

A method for preparing unidirectional carbon fiber metal matrix composites, characterized in that: after the metal melt in the crucible is melted, a certain amount of inert protective gas is introduced through a gas protection system; Put the pulling motor into the crucible; at the same time, use the servo system to precisely position the ultrasonic vibration system at a certain height from the carbon fiber, apply a certain time and a certain amplitude of vibration, so that the unidirectional carbon fiber is dispersed, and the metal melt fills the carbon fiber gap. The carbon fiber is evenly wrapped and prepared into a unidirectional carbon fiber metal matrix composite material; finally, the unidirectional carbon fiber metal matrix composite material and the ultrasonic vibration system are removed for cooling by using a servo system and a lifting motor.

Advantages and effects:

Compared with the traditional carbon fiber metal matrix composite material preparation device, the preparation device of the present invention has the characteristics of simple operation and high safety factor. Compared with the traditional preparation method, the preparation method of the present invention has the advantages of small carbon fiber damage, uniform and dispersed carbon fiber High degree, short production cycle of composite materials, high efficiency, suitable for continuous production, etc., the introduction of annular cooling device has solved the serious problem of poor heat dissipation of traditional preparation devices.

Description of drawings

The present invention is described in detail below in conjunction with accompanying drawing:

Figure 1 is a schematic diagram of the overall installation of the continuous carbon fiber metal matrix composite ultrasonic device.

The labels are: 1. Servo system, 2. Ultrasonic transducer, 3. Ultrasonic horn, 4. Airway, 5. High-pressure gas storage device, 6. Annular cooling device, 7. Ultrasonic vibration head, 8. Metal melt, 9. Continuous carbon fiber, 10. Gas protection device, 11. Melting and holding furnace, 12. Crucible, 13. Bow fixture, 14. Lifting motor, 15. Ultrasonic generator, 16. Connector, 17. Metal pole.

Detailed ways

The invention provides an ultrasonic device for preparing a continuous carbon fiber metal matrix composite material and a preparation method thereof, which can change the current situation that the carbon fiber is in contact with the metal liquid for a long time and the carbon fiber is damaged greatly during the preparation of the carbon fiber metal matrix composite material, and improve the degree of dispersion of the carbon fiber in the metal liquid , reduce the time required for carbon fiber dispersion, thereby reducing carbon fiber damage, and obtaining high-quality carbon fiber metal matrix composites.

Example:

As shown in Figure 1, a metal rod 17 is connected to the lower end of the servo system 1, and a motor is installed inside the servo system 1. The metal rod 17 can be controlled by the motor to move up, down, left, right, forward and backward. The threaded buckle at the lower end of the 17 is connected with a connector 16, the connector 16 is a connector with a circumferential thread, and is fixed with the metal rod 17 and the ultrasonic transducer 2 by a threaded buckle, and the threaded buckle at the lower end of the connector 16 is connected with the ultrasonic transducer 2, The connecting piece is a connecting piece with a circumferential thread, and the height of the ultrasonic transducer 2 can be fine-tuned through the length of the thread into the threaded buckle. The buckle is connected with an ultrasonic vibration head 7, and the ultrasonic transducer 2 is also connected with an ultrasonic generator 15 through a signal line for transmitting ultrasonic signals. The ultrasonic generator 15, the ultrasonic transducer 2, the ultrasonic horn 3 and the ultrasonic wave The vibration heads 7 are combined into an ultrasonic vibration system. The lower part of the ultrasonic vibration system is provided with a melting and holding furnace 11. A gas protection device 10 is provided inside the furnace cavity. A hole is provided on the inner side of the gas protection device 10. The diameter of the hole structure gradually changes as the height increases. Large, the crucible 12 is placed inside the gas protection device 10, the circumference of the ultrasonic horn 3 is provided with an annular cooling device 6, the annular cooling device 6 is in the shape of a "spring" spiral, and the upper part is vertically upward. The lower end is in a closed state, and the direction of the ultrasonic horn 3 is covered with 1~4mm round holes. The upper end of the annular cooling device 6 is connected with an air guide tube 4, and the air guide tube 4 is also connected with a high-pressure gas storage device 5 and a gas protection device. 10. The air guide tube 4, the high-pressure gas storage device 5 and the annular cooling device 6 form a cooling system, the gas protection device 10, the air guide tube 4 and the high-pressure gas storage device 5 form a gas protection system, and one side of the ultrasonic vibration system is provided with a pull Motor 14, the lower end of the lifting motor 14 is connected with a bow clamp 13 with a certain pre-tightening force.

The method for preparing unidirectional carbon fiber metal matrix composites by the above-mentioned device: After the metal melt 8 in the crucible 12 is melted, a certain amount of inert protective gas is introduced through the gas protection system; then the unidirectional carbon fiber 9 fixed on the bow-shaped fixture 13 is used Put the pulling motor 14 into the crucible; at the same time, use the servo system 1 to precisely locate the ultrasonic vibration system at a certain height from the carbon fiber, and apply vibration for a certain period of time and with a certain amplitude, so that the unidirectional carbon fiber 9 is dispersed, and the metal melt 8 is filled into the crucible. In the carbon fiber gap, the carbon fiber is evenly wrapped to prepare a unidirectional carbon fiber metal matrix composite material; finally, the unidirectional carbon fiber metal matrix composite material and the ultrasonic vibration system are removed for cooling by using a servo system and a lifting motor.

Claims (3)

1. An ultrasonic device for preparing carbon fiber aluminum matrix composites, comprising a servo system, an ultrasonic vibration system, a cooling system and a gas protection system, characterized in that: the lower end of the servo system is connected with a metal rod, the servo system is internally equipped with a motor, and the metal rod The lower end is connected with a connecting piece, the lower end of the connecting piece is connected with an ultrasonic transducer, the lower end of the ultrasonic transducer is connected with an ultrasonic horn, and the lower end of the ultrasonic horn is connected with an ultrasonic vibrating head, and the ultrasonic transducer is also connected through a signal line. There is an ultrasonic generator, an ultrasonic generator, an ultrasonic transducer, an ultrasonic horn and an ultrasonic vibration head to form an ultrasonic vibration system. The lower part of the ultrasonic vibration system is equipped with a melting and holding furnace, and a gas protection device is installed inside the furnace cavity. The crucible is placed Inside the gas protection device, the circumference of the ultrasonic horn is provided with an annular cooling device, the upper end of the annular cooling device is connected with an air guide tube, and the air guide tube is also connected with a high-pressure gas storage device and a gas protection device, the air guide tube, the high-pressure gas The storage device and the annular cooling device constitute a cooling system, the gas protection device, the gas guide pipe and the high-pressure gas storage device constitute a gas protection system, and a lifting motor is arranged on one side of the ultrasonic vibration system, and a bow-shaped clamp is connected to the lower end of the lifting motor; The annular cooling device is in the shape of a ring-like "spring" spiral, the upper part is vertically upward, the lower end is closed, and the direction of the ultrasonic horn is full of round holes; The diameter of the circular hole is 1 ~ 4mm; Holes are provided on the inner side of the gas protection device; The inside of the gas protection device is hollow and has a hole structure, and the size of the holes gradually becomes larger as the height increases; The connecting piece is a connecting piece with a circumferential thread, and is fixed with the metal rod and the ultrasonic transducer through a threaded buckle. 2. The ultrasonic device for preparing carbon fiber aluminum matrix composite material according to claim 1, characterized in that: the bow-shaped clamp has a certain pre-tightening force. 3. A method for preparing unidirectional carbon fiber metal matrix composites using a device as claimed in claim 1, characterized in that: after the molten metal in the crucible is melted, a certain amount of inert protective gas is passed through the gas protection system; then the The unidirectional carbon fiber fixed on the bow-shaped fixture is put into the crucible with a pulling motor; at the same time, the ultrasonic vibration system is precisely positioned at a certain height from the carbon fiber with a servo system, and vibration is applied for a certain time and with a certain amplitude, so that the unidirectional carbon fiber is dispersed. , the metal melt is filled into the carbon fiber gap, and the carbon fiber is evenly wrapped to prepare a unidirectional carbon fiber metal matrix composite material; finally, the unidirectional carbon fiber metal matrix composite material and the ultrasonic vibration system are removed for cooling by using a servo system and a lifting motor.