No-burr Hot-melt Drilling Technology
Abstract—No-burr hot-melt drilling technology can process holes and sleeves in one step with no burrs. This technology mainly uses the elastic force of the plastic surface to drive the liquid pressure of the drilled material to push the sleeves out gradually. The technical process is simple, and both the efficiency and the product quality can be guaranteed.
Introduction
The traditional drilling process is to process holes and sleeves separately, which will usually produce burrs. In order to solve the problem of burrs, no-burr hot-melt drilling technology has been developed. This technology is mainly used for parts with a few holes and small sleeve diameters. This technology has high processing accuracy, short processing time and no burrs.
Principle
No-burr hot-melt drilling technology mainly uses the elastic force of the plastic surface to drive the liquid pressure of the drilled material to push the sleeves out gradually. The drilling process can be divided into four stages: preheating, drilling, drilling hole recovery and sleeve extrusion.
The plastic surface of the material is preheated during preheating. The preheating time is controlled by the plastic properties and material thickness. During the drilling process, the drill bit is driven by the power tool to puncture the surface of the material, and the rubber-type heat-insulating protective fluid is injected from the center of the drill bit. The fluid melts the plastic material from the edge of the drill bit and the pressure in the middle of the drill bit increases rapidly, which pushes the material outward.
In the stage of drill hole recovery, the machined material is removed, leaving a hollow cylinder. During the sleeve extrusion stage, the elastic power of the plastic surface drives the cylinder out of the elastic inner wall to ensure the size accuracy, and there will be no burrs.
Conclusion
No-burr hot-melt drilling technology is an effective no burr solution. It is suitable for parts with a few holes and small sleeve diameters, and the technical process is simple. Both the efficiency and product quality can be guaranteed.
