Hot melt drill
The hot-melt drilling process is a chip-free processing technology that processes holes and bushings on a metal plate at one time, completely replacing the solding process of welding (riveting) nuts on a thin plate. Hot-melt drills are made of wear-resistant and high-temperature-resistant carbide materials.
Working principle:
When the tool is in contact with the workpiece, the high rotational speed (1000~3500) and the appropriate axial thrust (feed force) cause severe friction between the drill and the workpiece, and the temperature reaches 650° to 750°C in an instant.
The metal in the area near the drill bit softens rapidly, and the axial pressure continues to be applied to rapidly extrude bosses and bushings about 3 times the thickness of the initial plate on the upper and lower surfaces of the workpiece. The whole process only takes 2-6 seconds.
For operations that require smooth joining surfaces or chamfered holes, a flat drill can be used to remove bosses formed on the workpiece surface.
Threads are roll formed and machined threads can withstand higher tension and torque.
Advantage:
1. The thread can withstand higher tension and torque
2. No chip processing, no waste generated after processing
3. The forming precision on the boss is high.
4. Suitable for a variety of tapping machines.
5. High speed, long service life, improve production.
6. Suitable for a variety of materials that can be hot-melted drilling.
Application:
◆ Automobile industry
◆ Bicycle Industry
◆ Stainless steel furniture
◆ Aerospace
◆ Central heater
◆ Lighting industry
◆ Machine and metal construction
◆ Electroplating and coating industry
Classification of hot drills:
Depending on the thickness of the workpiece to be drilled through, hot drills are available in two lengths:
Short drill: suitable for penetrating workpiece thickness in 0.8mm -3mm.
Long drill: used to penetrate workpiece thickness greater than 3mm -12mm.
According to the surface requirements of the workpiece after penetration by the hot drill, the hot drill has two specifications:
Standard Hot Drill : The hot drill penetrates the workpiece and draws the bush while forming a raised ring on the workpiece surface.
Flat type hot drill: The hot drill penetrates the workpiece and stretches to form a bushing, and at the same time cuts off the convex ring on the surface of the workpiece, and the surface of the workpiece is smooth.
For drilling stainless steel, the diameter of the thread is M8 or above, the diameter of the hot drill should be larger by 0.1mm and the speed of the drill should be reduced by 10-20%.
For non-ferrous metals, the speed of the drill should be increased by 50%.
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