The more important thing of ultrasonic plastic welding machine in the welding process is the quality problem

To control the welding quality of ultrasonic plastic welding machine, we must understand the quality problems that are easy to occur in the welding process of ultrasonic plastic welding machine, and then solve them. After skilled operation, we can control them freely. First, introduce the types of quality problems that are easy to occur in the production of ultrasonic welding:

In the actual production of ultrasonic welding, especially for personal consumer goods that require high quality in appearance and performance, such as mobile phones, the quality is still a problem that is difficult to control. Based on the past experience, it is found that some quality problems that are usually prone to occur are: low strength, scars or cracks on the product surface, distortion, deformation or self color of the product, damage or offset deformation of internal parts of the product due to extrusion, burr of the product, the size of the product after welding cannot be controlled within the tolerance, product offset After ultrasonic welding, it can not meet the requirements of water vapor sealing performance.

Solutions to common quality problems in ultrasonic welding.

Ultrasonic welding is generally composed of four basic elements: ultrasonic machine, ultrasonic parameters, ultrasonic positioning fixture and products. For the common process problems in ultrasonic welding production, we can improve them through the following points.

(1) Improve ultrasonic welding fixture

Ultrasonic welding fixture mainly plays the role of positioning and bearing. For products with complex three-dimensional curved surface shape and high machining accuracy, there are high requirements for the machining accuracy of ultrasonic fixture. When the angle or radian of the welding fixture is inconsistent with that of the product to be welded, it is easy to cause deformation of the product after welding. Generally, the fixture material is aluminum alloy. After the fixture is processed according to the shape of the product to be welded, it is also necessary to change the natural frequency of the fixture through fine adjustment, so that the welding effect is better when its frequency is used with the ultrasonic welding machine, Such fixtures generally need to be processed by professional ultrasonic welding machine manufacturers or acoustic research institutes

For products easy to crack and break, the welding fixture should adopt soft resin or covering cork and other cushioning design. For products that are not easy to break, the welding quality can be improved by surface treatment of ultrasonic welding fixture.

(2) Adjust ultrasonic welding conditions

The conditions of ultrasonic operation refer to the setting of machine output power, pressure, welding time, hardening time, delay time and other elements. Ideal welding effect can often be obtained by optimizing the conditions of ultrasonic operation.

When implementing ultrasonic welding, if the pressure is too large and the cylinder drops and buffers too fast, it is easy to flatten the ultrasonic welding line. Although the product seems to have been tightly closed, the welding line has been squeezed and sunk, resulting in the loss of welding effect, forming the forced welding of plastic parts surface to surface rather than the guided welding of triangular points, so the welding illusion is generated.

(3) Optimization of ultrasonic welding line

The design of product welding line is unreasonable, and the product slides due to pressure during ultrasonic welding, resulting in product deviation. Or, the welding line may have no problem in design, but such problems may also occur due to different sizes due to insufficient machining accuracy of welding line parts. Therefore, at least the welding line shall be symmetrical during mold processing, Highly consistent. Positioning and ultrasonic welding line are the key to the success or failure of products to achieve the function of appearance.

To sum up, let's make a summary:

(1) Amorphous polymer thermoplastic is an ideal material for ultrasonic welding.

(2) According to the product characteristics and occasions, ultrasonic welding lines generally adopt four modes: triangular welding line, peripheral welding line, peak valley welding line and step welding line.

(3) The common quality problems of ultrasonic welding in production can be solved by improving ultrasonic welding fixture, adjusting ultrasonic welding conditions and optimizing ultrasonic welding line.

To control the welding quality of ultrasonic plastic welding machine, we must understand the quality problems that are easy to occur in the welding process of ultrasonic plastic welding machine, and then solve them. After skilled operation, we can control them freely. First, introduce the types of quality problems that are easy to occur in the production of ultrasonic welding:

In the actual production of ultrasonic welding, especially for personal consumer goods that require high quality in appearance and performance, such as mobile phones, the quality is still a problem that is difficult to control. Based on the past experience, it is found that some quality problems that are usually prone to occur are: low strength, scars or cracks on the product surface, distortion, deformation or self color of the product, damage or offset deformation of internal parts of the product due to extrusion, burr of the product, the size of the product after welding cannot be controlled within the tolerance, product offset After ultrasonic welding, it can not meet the requirements of water vapor sealing performance.