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Novel plastic processing techniques-ultrasonic plastic welding

Novel plastic processing techniques
Contemporary society, a variety of plastic products, has penetrated into the daily lives of people in various fields, but also has been widely applied to aviation, shipbuilding, automobiles, toys, electronics and other industries. However, due to the limitations of the injection molding process and other factors, not once in a considerable part of the complex shape of the plastic products injection molding, which requires bonding, and use for many years plastic adhesive and heat sealing process and rather backward, not only inefficient, and bonding agent, there is a certain toxicity, causing environmental pollution and labor protection. This process can not be applied to the development needs of the modern plastics industry so novel plastic processing technologies - ultrasonic plastic welding its efficient, high-quality, beautiful, energy-saving superiority come to the fore. Ultrasonic plastic welding machine welding plastic products that do not fill plus any adhesives, fillers or solvents, nor consume a large amount of heat source, with a simple, fast welding, welding high strength, high production efficiency. Therefore, ultrasonic welding technology becomes more widely available.

An ultrasonic plastic welding machine works.
When the ultrasonic role in the thermoplastic plastic contact surface will produce the high-frequency vibration of the tens of thousands of times per second, this reaches a constant amplitude high frequency vibration, the ultrasonic energy is transferred to the weld zone by weldment, due to the welding area two The welding at the interface acoustic resistance large, it will produce a local high temperature. Plastic poor thermal conductivity, for a moment, not timely dissemination, gathered at the weld zone, resulting in two plastic contact surface rapidly melting, plus a certain pressure, so that it fused into one. When the ultrasonic stopped functioning, so the pressure for a few seconds, and solidified molding, thus forming a strong chain, the purpose of welding, weld strength close to the raw strength. Ultrasonic plastic welding is good or bad depends on the amplitude of the transducer welding head, plus the three factors of pressure and welding time, welding time and welding head pressure can be adjusted, the amplitude is determined by the transducer and horn. Three quantities each other with a suitable value, plastic melting on the large amount of energy greater than the appropriate value, and the welding object easily deformable; if the energy is small, easy to weld, the large and the applied pressure can not be reached. This optimum pressure is the length of a side of the welded portion with the optimum pressure for each 1mm of the edge of the plot.
Second, the method of ultrasonic plastic welding
1, ultrasonic vibration welding method of welding with head ultrasound conduction to the weldment two weldments acoustic resistance, resulting in local high temperature, melting interface weldment. Under a certain pressure, the two weldments achieve beautiful, fast, sturdy welding results.
2 buried interpolation nut or other metal To insert plastic parts. First, the ultrasonic wave transmitted to the metal, directly embedded within the molded plastic, the plastic melt at the same time, so that the metal objects by high-speed vibration, completed after curing buried interpolation.

3, the riveted the law wishing metal and plastic, or two of the different nature of plastic bonding, ultrasonic riveting, hard brittle, beautiful, strong weldment.

4, spot welding method using small welding head the two major points of the plastic products welding, or welding head of the entire row of dentate direct pressure on the two plastic parts, so as to achieve the effect of spot welding.

5, the molding method using ultrasonic plastic workpiece instantly melt molding, metal or other plastic material can be securely when the solidification of the plastic.

6, excision specially designed for welding head and the base, when the plastic parts just fired, direct pressure on the plastic branches, to achieve the effect of resection by ultrasonic transduction.

Third, since the composition and role of the sonic plastic welding machine

Ultrasonic plastic welding machine by pneumatic drive systems, control systems, ultrasonic generator, change can and tool head and mechanical devices.

1, pneumatic drive system

Including: Guo Hu, pressure reducing valves, oil mist, commutator, throttle valve, cylinder.

The first work by the air compressor drive stroke cylinder to drive the ultrasonic transducer vibration system to move up and down, power Pressure Pressure in the small and medium-power ultrasonic welding according to the welding needs the set.

2, the control system

The control system consists of a time relay or IC timer.
The main functions are: control pneumatic drive, its the welding open gas line valve timing control, cylinder pressure welding head down, objects to be welded to a certain pressure to suppress, when welding after holding pressure for some time gas line valve commutation, the welding head rebounded reset control system; control of the ultrasonic generator working hours, the system to automate the entire welding process, only the start button operation generates a trigger pulse, can automatically finish The whole process of the welding. The sequence of the entire control system: the power to start a trigger control signal pneumatic drive system, the cylinder pressure the welding head down and hold welding trigger ultrasonic generator transmits ultrasonic and maintain a certain welding time to remove the time to retreat to continue to maintain a certain pressure ultrasonic emission the end of the welding pressure, welding head rebound.

3, the ultrasonic generator

1) power ultrasonic plastic welding machine, generator signal phase-locked frequency automatic tracking circuit, the output frequency of the generator is basically consistent with the transducer resonance frequency.

2) power in more than 500W ultrasonic plastic welding machine used generator uses the power of self-excited oscillator frequency tracking ability.

4, ultrasonic plastic welding machine using acoustic system

1) transducer
Ultrasonic plastic welding machine acoustic system consists of three parts: a drive part 2 part 3 fixed part. In the above three components, the drive is a core, generally use the bolt clamping the longitudinal vibration transducer, wherein the half-wavelength longitudinal transducer with a quarter of the wavelength of the longitudinal transducer, the half-wavelength longitudinal vibration with half-wavelength concentrator phase connected to form a full wavelength plastic welding transducers, while the quarter wavelength longitudinal transducer with quarter wavelength concentrator connected to form a half-wavelength transducer.

2) the tool head
Different welding objects need to have a different tool head, regardless of the welding or the transmission of the near-field welding, only a half wavelength of the tool head in order to make the maximum amplitude of the welding ends. Tool head, with a larger amplitude and without acoustic system for the amplitude amplifying two plastic welding machine tool head, the material used is usually aluminum alloy, its end surface plated carbide, the power is large also useful titanium alloy material into the material fatigue strength than aluminum more than doubled.

Ultrasonic plastic welding machine models and specifications
Ultrasonic plastic welding machine different use occasions and welding materials, welding size sample sizes, and also a wide range of its specifications. Few kilowatts of frequency output power from tens of watts of manual welding machine to the mainframe is generally in the range of 15KHz to 40KHz.
Xi Nike Ultrasonic Equipment Co., Ltd. to develop and produce 15KHz, 20KHz ultrasonic plastic welding machine is used widely in the models, the output power of 1000W-4000W, the operating frequency of 15KHz, 20KHz, and light weight, good quality, is one of the manufacturers of plastic industry preferred ultrasonic plastic welding machine. Ultrasonic plastic welding machine is its irreplaceable advantages, into the areas of the plastics industry, played a huge role in creating huge benefits, but also look forward to greater breakthroughs ultrasonic plastic welding function, to play for the plastics industry greater contribution

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