Communication Board-JINZHOU-WORLD-LEADING MICRO TOOLs’MANUFACTURER

On June 6th, 2019, the Ministry of Industry and Information Technology officially issued 5G commercial licenses to China Mobile, China Telecom, China Unicom and China Broadcast, marking that China officially entered 5G commercial year. With the coming of the 5G era, the demand for communication-related PCBs soar and the drilling problem appears now and then.

--Heavy commitments with high-quality requirement, yet low hole limits and slow speed lead to low production capacity.

--For high-speed boards with aspect ratio almost 30 times, flip drilling not only causes low efficiency but also risk counterpoint.

---Back drilling with more series blocking problems

Fortunately, Jinzhou has put forward related solutions to deal with the above difficulties.

--High-speed drills specially designed for high-speed boards can improve hole limit for more than 60% and improve processing efficiency.

--Ultra-high aspect ratio drills, the highest aspect ratio reached 35times, make it possible to drill through from one side.

--Special back drill to do with all kinds of blocking…

The features of high-speed and high-frequency board

Features	Changes	Difficulties
Environment Friendliness	The changes of materials	Chip assembles more easily and it is harder to deal with smear.
High Reliability	High Layer becomes common	Extended drill structure causes breakage easily.
High Reliability	Higher dimensional stability requirement	High requirment for hole registration accuracy, hole roughness and nail heading.

The summary of difficulties in high-speed board's processing

Recommended drills for processing high-speed board

Processing type		Recommanded bits
Drilling processing	aspect ratio ＜20	USE（priority）、USF and it's corresponding SHC coated products
	aspect ratio ≥20	USF and it's corresponding SHC coated products
Back drill processing		A129BD

The design feature and application advantages of subslot-type drills

1、Improve cutting performance，lower drilling tempreture.

By increasing the cutting edge rake angle near the center, where extrusion changes into cutting process, the cutting performance gets improved, which helps to reduce cutting resistance and cutting heat.

2、Improve bird nesting performance

Formed a unique broken line edge, and increased the effective length of the main cutting edge, which helps to improve chip breaking performance, effectively avoid bird nesting.

3、Small axial force, precise position and more stable hole registration accuracy.

The design of core diameter gradient makes the web thickness gradually increase after repointing, which result in low positioning and increasing axial force, causing breakage.