METHOD FOR INSERTING A COMPONENT THROUGH A SURFACE OF A WORKPIECE

摘要

A method for inserting a component through a surface of a workpiece made of a first material uses friction-induced plasticity of the latter to attach the component to the workpiece. The component includes a head portion having a base and a working end being threaded, and an insert portion having a penetrating end and provided with a threaded bore closed at its penetrating end, to initially receive the threaded working end. The outer surface of the insert portion being made of a second material harder than the first material, a rotary tool can be used to insert the component through the workpiece surface, by rotating the rotary tool in a first direction while applying an axial force onto the head portion base to produce substantially full insertion of the insert portion, and by maintaining the axial force during a sufficient setting time without rotation to produce the attachment.

主权项

1. A method for inserting a component through a surface of a workpiece made of a first material showing friction-induced plasticity to attach said component to the workpiece, said component including a head portion having a base and a working end being threaded at its outer surface and an insert portion having a penetrating end and extending along an insertion axis of said component, said insert portion being provided with a threaded bore closed at said penetrating end and extending along said axis to initially receive said threaded working end, at least an outer surface of said insert portion being made of a second material harder than said first material, said method comprising the steps of:
i) providing a rotary tool having a body defining a shoulder portion; ii) securing the head portion base to the tool body; iii) rotating the rotary tool in a first direction while applying an axial force of a sufficient magnitude onto the head portion base to produce substantially full insertion of the insert portion along said axis by plasticizing the first material through friction at least until said shoulder portion is contacting said workpiece surface; and iv) maintaining said axial force during a sufficient setting time without rotation to produce said attachment.