TAIRISHENG: YIZUMI DM4000HA Die-Casting Production Line for 5G Filter Housings successfully put into operation

Recently, Dongguan TAIRISHENG TechnologyCo., Ltd. (hereinafter referred to as ”TAIRISHENG”) successfully put a YIZUMI DM4000HAdie-casting production line into operation to manufacture filter housings forZTE 5G base stations.

TAIRISHENG is a state-owned enterpriseaffiliated with CECIS, a subsidiary enterprise of China Electronics CorporationGroup (CEC) which specializes in the manufacturing of precise equipment andhardware for communication, electronics, medical, aerospace, automobile, andrailway braking systems and other business fields.

Believing in YIZUMI’s strong industry reputation and considering the high-quality requirements of thestructural parts used in 5G base station, TAIRISHENG entrusted YIZUMI with its order for a 4000t die casting cell in 2019.  In January 2020, YIZUMI’s HA series 4000Tdie-casting machine was installed at TAIRISHENG and realized regular production in March. The yield rate of this 5G base station filter housingproduction has exceeded 97%, and its productivity has reached 380 pieces/shift.In its newest version, these 5G base station housings feature larger dimensions with a more complex geometry and unavoidable uneven wall thicknesses. Quality requirements for these components include highest part integrity with highdensity and no shrinkage porosity to facilitate good thermal conductivity. Dueto after-casting-operations of machining, very restrictive tolerances areapplied regarding porosity across the part.  Besides a high-quality die design, it is crucial that the injection process avoids any air enclosures.

The chosen YIZUMI DM4000HA die castingmachine, equipped with the 5th generation real-time closed loop shot control system,is well suited to ensure highest injection precision and repeatability needed for such large structural die casting components：

Key DCM success features include:

l  Optimized and smooth plungermovement in the pre-filling phase with constant acceleration which effectively reduces air entrapment in the metal.

l  YIZUMI`s ARC real time closed loopshot control ensures a highly precise and repeatable injection process resulting in highest process consistency.

l  The improved acceleration of the filling speed and the shortened pressure build-up time ensure a precise cavityfilling and highest compensation of metal shrinkage during solidification.

l  The ARC system allows breaking ofthe injection speed shortly before the end of the cavity filling to protect the die from unnecessary metal pressure impact and reduces flash build up.

Applying vacuum, integrated in the YIZUMIDM4000HA die-casting cell, air in the cavity is efficiently evacuated further minimizing gas porosity and allowing to heat treat the castings after casting.

With the advantages mentioned above, YIZUMI’s DM4000HA die-casting machine realizes highest consistency and stability for theinjection process. The machine’s outstanding performance is well recognized by TAIRISHENG. According to the relevant person in charge, theDM 4000 HA die-casting machine is the largest tonnage die-casting equipment currentlyin operation at TAIRISHENG. The machine demonstrates excellent performance in process stability and is easy to operate.This results in very few production interruptions which, combined with the lowreject rate leads to an attractive OEE for TAIRISHENG. This reliable casting production allows TAIRISHENG to guarantee “on-time” delivery even with a very tight order schedule.