How to solve the instability of ultrasonic welding product quality?

The best way is to choose large units of ultrasonic welding equipment;

The most important factor of unstable quality is the unstable output power, which leads to the formation of stable friction heat energy. How to make the power output stable? It's up to you

<1> Machine output power;

(2) horn expansion ratio;

(3) pressure source;

4) voltage source.

1. Machine output power + horn expansion ratio = actual available power. It can be seen that in the planning and design point of view, the stronger the output power of the machine, the smaller the expansion of horn.

On the contrary, the smaller the output power of the machine, the larger the expansion ratio of horn design. For example: 2200W ultrasonic welding machine, horn expansion ratio is 2.5 times. When changing to 3200W ultrasonic welding machine, the horn expansion ratio may only be 1.5 times. However, it is not emphasized that the output power of the ultrasonic welding machine should be large, but that the most suitable environmental operation should be given when the ultrasonic welding of a plastic product is implemented. In the meantime, the cost budget, the functional requirements of the product and the welding standard should be considered, and then the complete working equipment and ultrasonic use skills can be planned.

2. After understanding the above key factors that affect the quality of ultrasonic welding, engineers should be familiar with and evaluate 1; 2. Existing ultrasonic equipment;

3. Determine the form and skills of product design, such as ultrasonic waveguide fuse, product positioning and material. Since the available equipment resources have been fixed, it is correct to use product design skills to match the existing available equipment.

4. When we determine that there is no problem with human factors (1-2 items), there will be quality instability. That is a fact: the influence of air pressure and voltage. When we have been dealing with the unstable quality for many years, we also found that the quality standard that can't be reached during working hours unexpectedly meets the quality standard when everyone is off duty and most of the voltage and air pressure are used at the same time. Therefore, it is also found that when multiple people or units use a common air pressure and voltage source, because of the air compressor, we usually set the air pressure in the air storage tank to be lower than 2 ~ 4kg, and then automatically inflate and fill, which is a cause of error. When the air pressure source arrives at the welding machine through the pipeline, due to the fast welding speed, the air pressure of the first ultrasonic welding and the air pressure remaining in the pipeline for the second or third time also form errors, which will form periodic or non periodic mass change. The output of the power company is for millions of people to use at the same time, and the voltage drop produced at this time is beyond our control, so the variation of air pressure and voltage really causes the change of energy output, which is an important factor affecting the precision quality.

Youwo ultrasonic provides countermeasures for you:

In order to meet the demand of high quality, if the demand of the product is less than 0.02m/m, or the fusion condition of the fusion line is more than 90%, the design engineer must follow the planning order

1. Familiar with ultrasonic welding equipment;

2. Determine the function of the product;

3. Familiar with the relationship between ultrasonic and plastic welding;

4. Add voltage stabilizing equipment as much as possible.