HeNan Perfect Auto Parts Co.,Ltd.
He Nan Perfect Auto Part co.,Ltd is a professional factory with 10
years history.mainly producing and
selling diesel nozzle,injector assembly,nozzle nut,injector repair
kits,valve,valve cap,and so on,We
passed ISO/TS 16949:2002 certification.We have advanced equipment,
testing machine and
management system.Our products have been exported to Europe , USA,
Centraland south America,
Southeast Asia, Mid East ,Africa , etc.
Production line of common rail injector
Needle valve body manufacturing process
Step 1: Needle valve blank drilling
Our introduction begins with the blank of the needle body. The
four-axis gun drilling machine imported from Germany is used for
rough machining of the needle body blank, the four-axis gun is
drilled once, and the hole in the injector is formed once.
This is the way after processing, and the one-time forming can
ensure the concentricity, straightness and roughness meet the
Step 2: Processing the needle valve body hole position
Next, this equipment is a vertical machining center imported from
the United States. It is used to machine the hole positions of the
needle valve body. The fuel nozzle processes two positioning holes
and one oil inlet hole through it.
Step 3: Electrochemical Electrolytic Oil Tank
This step is an electrochemical electrolysis oil sump that ensures
the size of the oil sump while ensuring that there are no burrs.
The original process is to use a knife to extend into the digging.
For products with extremely high precision such as the injector,
the disadvantage is that there are more burrs and irregular shapes.
The use of electrochemical electrolysis can solve this problem very
Step 4: Spray hole processing
At present, the typical process is a micro-hole EDM process. The
Swiss-made CNC micro-hole EDM machine is used. The flow accuracy is
±3%, and the precision of the injection hole is very high.
In order to ensure the injection pressure and effect of the
injector, the accuracy of the injection hole is very high. The
orifice should be inverted and tapered to help increase the orifice
flow coefficient and enhance the spray effect.
Step 5: Extrusion grinding
Next, using the American-made extrusion grinding equipment, the
flow rate of the squeeze needle valve body is detected online to
reach the flow standard, and the error is controlled within ±1%. At
the same time, there is deburring effect, which can reduce the
pressure loss of the nozzle.
The extrusion grinding equipment detects the interface and the
error is controlled within ±1%.
Step 6: Traffic Detection
Flow rate detection is performed on the processed needle valve
body, and the valve body of each nozzle is 100% tested for flow
The one we saw was the flow meter, which is also the highest level
of testing equipment in the country.
In addition, in order to better understand whether the injector can
meet the needs under actual working conditions, it is also
necessary to test the injector and the original injector after
installation. This is the Italian common rail injector test bench.
The function is to test the technical parameters of each working
condition after installation with the original injector.
Step 7: Processing the hole seat surface and the large end surface
What we see here is the German-made CNC high-precision mesoporous
grinding machine. It is used to machine the middle hole, seat
surface and large end face of the needle valve body.
Automatic loading and unloading can be realized in one clamping,
which ensures the accuracy and coaxiality of each part. In
addition, the large end face is indented after fine grinding, which
is advantageous for assembly and sealing with the injector body.
Next, let's take a look at another important component of the
injector – how the needle valve is processed.
Step 1: The needle valve is roughened into a blank
After the heat-treated needle valve is roughly ground, a blank is
formed, and fine grinding is continued in the subsequent process.
Step 2: Detect the needle blank size
First of all, it is necessary to check and confirm the size of the
needle valve blank, and enlarge it by the projector to ensure the
precise cooperation with the needle valve body.
Step 3: Processing the needle angle
The detected needle valve was sent to a German CNC high-precision
cylindrical grinding machine for processing. This step is mainly to
process the angle of the folding method.
Needle valve being prepared for processing
Step 4: Cut the needle valve size outer circle
Finally, the outer diameter of the needle valve needs to be cut,
which is done by a CNC high-precision coreless grinding machine
made in Italy. The roundness of the needle valve needs to be
controlled above 0.25μm in order to meet the accuracy requirements
of the common rail injector.