AAK uses 4-step method to ensure cartridge relief valve free of burrs

For the processing of the main valve hole of the hydraulic cartridge relief
valves, AAK uses a new 4-step method instead of the traditional 4-step method,
which is 100% burr free. Rubio from Mexico, placed the big order 1 week after
the first test order.

Regarding the burrs in the main valve hole of the hydraulic cartridge relief
valves, it involves 2 parts: how to effectively avoid and remove them. How to
effectively avoid is the root cause. How to remove is the symptoms. AAK focuses
on the root cause, while other hydraulic valve manufacturers pay attention to
the symptoms. Burr is common in machining. As for how to control the burr in
the main valve hole of hydraulic cartridge relief valve, most hydraulic relief
valve manufacturers ignore the dead corner in the undercut groove. No matter
how to clean it, the pain point of "black under the light" cannot be solved.

2 years ago, Rubio purchased the hydraulic cartridge relief valves from China
for the first time, and almost overturned. For a hydraulic cartridge relief
valve with a rated pressure of more than 30MPa, and a clearance of 0.006 ~
0.01mm between the valve body and the valve spool, samples were made by 4
hydraulic valve manufacturers successively in 8 weeks. The parameters of each
sample of the hydraulic cartridge relief valve were qualified during
independent testing. However, once it was installed on the equipment and
tested, the hydraulic system would not function very well. The root cause is
the burr residue in the dead corner of the hydraulic cartridge relief valve
cutting groove.

Rubio browsed a series of articles about the burrs of AAK hydraulic valves and
hydraulic valve blocks on the B2B website. When Rubio learned that HydraForce,
SUN Hydraulics, are also loyal customers of AAK for more than 5 years, he
seemed to be in no worry. According to the technical parameters provided by
Rubio, we have existing procedure for this hydraulic cartridge relief valve. We
sent 5 samples of hydraulic cartridge relief valves the next day.

For the machining of the main valve hole of the hydraulic cartridge relief
valve, AAK uses a new 4-step method instead of the traditional 4-step method,
which is 100% burr free. 1 week after Rubio received our test samples, he sent
the PO of 600 hydraulic cartridge relief valves.

The undercut of the main valve hole of the hydraulic cartridge relief valve is
the place where the most burrs are generated. The traditional processing route
is: first rough boring, then semi fine boring, then milling the undercut, and
finally reaming. After reaming, the burrs generated are in the same direction
with the axis line of the hole, and sink into the undercut, forming the burr
residues in the dead corners of the undercut, which cannot be 100% removed. We
do not ignore this pain point. After several rounds of technical reform, we
optimized a new 4 step method: first rough boring, then semi fine boring, then
reaming, and finally milling the groove. The burr found after processing is
perpendicular to the axis line. The burr here is visible and can be removed,
and it is easy to remove without leaving dead corners.

AAK hydraulic cartridge relief valve, burr free, valve not stuck, welcome to
try!

https://www.aakindustry.com/info-d , etail/hydraulic-cartridge-relief-valves-
aak381

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