The effect of Ultrasonic Plastic Welding machine is inversely proportional to elastic modulus, coefficient of friction and thermal conductivity, and inversely proportional to density, specific heat capacity and melting point. The effect of ultrasonic welding machine is mainly related to the melting point and surface friction coefficient of the material. These parameters vary with material and temperature. Different materials have different requirements for ultrasonic welding machines. The process changes of Ultrasonic Plastic Welding machine will affect the temperature, stress and deformation of the ultrasonic welding machine area, thus affecting the quality of the ultrasonic welding machine. However, the time of the ultrasonic welding machine is very short, and it is difficult to control the change of parameters in the experiment, so Japanese and foreign scholars use numerical simulation methods to solve this problem analyzed the influence of the physical parameters of polyvinyl chloride (PVC) on the ultrasonic welding machine by the finite element method, and concluded that the temperature of the ultrasonic welding machine is proportional to the thickness of the sample. Ultrasonic welding machines of different materials have different requirements for them, mainly in the following points.
1. The effect of welding material transformation
The change of the ultrasonic welding machine material affects the quality of the ultrasonic welding machine. The addition of fillers such as fibers improves the hardness of the polymer material and is beneficial to the propagation of ultrasonic waves. Under proper process conditions, adding fillers can improve the strength of ultrasonic welded joints.
2. The effect of roughness on the surface of the material
The higher the surface roughness, the lower the acoustic impedance, the higher the surface energy flux density, and the better the ultrasonic welding quality. Using film material to knurl on the surface can achieve higher quality of ultrasonic welder, and the joint strength of PP film ultrasonic welder with smooth surface is almost doubled.
3. The influence of material overlap width
The larger the lap width of the material, the lower the strength of the ultrasonic welding machine joint. The greater the lap width, the greater the stress concentration, the more edge defects, and the lower the joint strength. The strength of the ultrasonic welded joints decreased with the increase of the width of the glass fiber modified polyphenylene sulfide prepared by the layered dipping method.
4. The influence of the distance between the weld surface and the weld
When the distance between the ultrasonic welding surface and the welding head reaches half wavelength, the strength of the ultrasonic welding machine joint increases.
The ultrasonic propagation of plastics is dominated by longitudinal waves, and the peaks of longitudinal waves often appear at half wavelength. At a distance close to half a wavelength, the ultrasonic wave transfers more heat energy to the interface of the ultrasonic welding machine, resulting in a good ultrasonic welding joint.
In the HS1000 ultrasonic welder of different thicknesses (allyl phosphate and clay to polyphenylene ether, half wavelength 3.86 cm), the strength and growth of the ultrasonic welder joint with a critical thickness of 3.86 cm was found to be thinner than that of the critical thickness joint. As the thickness increases, the strength of the ultrasonic welded joint decreases sharply when the thickness is greater than the critical thickness.
Precision steel frame
Sheet metal shell dot matrix screen
0. 1-0. 7MPa