Two brass threaded bolts for fixing should be applied to a plastic housing for an automobile door locking device. As the plastic part is produced in high numbers, the fastening bolts must be inserted into the housing by an efficient method.
Using ultrasonics, standard commercial SonicLok ® threaded bolts and bushes can be prefitted and embedded in a prepared hole. Depending on the size of the bolts and geometric shape of the plastic part, noise insulation measures in the form of personal hearing protection or a complete noise protection housing may be required.
In contrast to the embedding of threaded inserts using heat or injection-moulded insertion, embedding with ultrasonics is convenient, quick and efficient. As a result of the low volume of melted plastic, the cooling time can be kept to a minimum and no dangerous heat stresses, which can lead to cracks, occur in the plastic. SonicLok ® thread inserts are standard commercial products available cheaply on the market in various design shapes and sizes.