Introduction to titanium screw processing technology!

The mainstream titanium screws are produced through two process routes: cold/warm upsetting for large-scale production and CNC precision turning for small-scale production. Common raw materials include TA2 pure titanium and TC4 (Ti-6Al-4V) titanium alloy, which are respectively used for corrosion-resistant general-purpose parts and aviation/high-strength fasteners. The overall process flow is as follows: raw material preparation → billet forming → rod precision turning → thread processing → heat treatment → surface treatment → full inspection and warehousing.

Head molding (two major molding processes)

1. Cold heading/warm heading (preferred for large-scale production of standard screws, low cost, yield rate of 95%+)

Pure titanium TA2: Cold heading at room temperature, using a multi-station cold heading machine to extrude and form inner hexagon, disc head, and outer hexagon in stages, with a single-pass deformation amount of less than 30% to prevent cracking at the lower R corner of the head. Molybdenum disulfide-specific titanium lubricating grease is used to prevent die sticking.

TC4 titanium alloy: It must undergo warm upsetting (preheated at 300~750℃). α+β titanium has poor plasticity at room temperature, making it extremely prone to head cracking during direct cold upsetting. The head and the fillet beneath the head should be formed through segmented upsetting and forging, using a carbide YG15 material for the mold.

2. CNC turning and forming (non-standard, micro, and irregular screws)

For M0.8 micro precision screws, non-standard irregular heads (such as torx, dodecagon, and offset head), and bolts with a large diameter greater than M30, a swiss-type machine tool/CNC lathe is used to directly machine the head shape and the fillet under the head. The dimensional accuracy is IT6~IT7, with a tolerance of ±0.01~0.02mm. The material utilization rate is relatively low, ranging from 25% to 40%.