engine. On the other hand, the gas actuator has dozens of ventilation slots. The
structure shape is irregular, and the assembly and grinding must be carried out
crosswise. Cylinder is an open structure, which makes it more difficult to control the
redundancy. One of the important reasons for valve core stopping and piston stuck
is that there is redundancy in the steering gear. Through continuous improvement,
the following measures have been taken to effectively control the redundancy:
Improve the design, make the structural dimension tolerance coordinated and reasonable, and avoid redundancy due to supplementary processing in the assembly
process. For example, after the original rudder axle is pressed and installed, the
inner hole shrinks. In order to load the steel ball, it is necessary to supplement the
reaming bore, which inevitably causes redundancy. After adjusting the tolerance,
the original drawbacks were eliminated. When processing valve core, piston, and
bushing, the burr should be strictly checked and controlled by microscope
according to assembly requirements.
The valve sleeve hole on the shell assembly is composed of several parts which
are combined and ground. The control of grinding sand is an important link in
controlling surplus. The original process is difficult to completely remove the
grinding sand deep inside the valve sleeve hole. If slightly neglected, over a long
period of time, the grinding sand will be solidified inside the valve sleeve and
cannot be cleaned, resulting in batch scrap. After improvement, the grinding sand
will not enter the inner depth of the valve sleeve hole. The grinding sand on the
Table 10.4 Faults of gas steering engine in pilot fire test
Serial
number
Number State
Fault
phenomena
Causes of failure
Solutions
1
01
Low
temperature
Valve core
stopping
Valve plate runs
out of control
during heat
treatment, contains
excessive
Austenite, and the
hole of valve
sleeve shrinks
during ignition
Strengthen quality
control of heat
treatment process
and check
metallographic
structure of valve
plate
2
02
High
temperature
Valve core
stopping
Wear of measuring
head results in
smaller mating
clearance between
valve sleeve and
spool
Improve the
measurement
method and
control the fit
clearance
3
03
High
temperature
Valve core
stopping
Valve spool is
burred
Strengthen the
control of
redundancy
4
04
Lifetime
Disqualification
of reaction time
symmetry
The opening of the
slide valve is not
symmetrical
Control the
symmetry of slide
valve opening
10.4 Process Technology of Gas Steering Engine
189
structure shape is irregular, and the assembly and grinding must be carried out
crosswise. Cylinder is an open structure, which makes it more difficult to control the
redundancy. One of the important reasons for valve core stopping and piston stuck
is that there is redundancy in the steering gear. Through continuous improvement,
the following measures have been taken to effectively control the redundancy:
Improve the design, make the structural dimension tolerance coordinated and reasonable, and avoid redundancy due to supplementary processing in the assembly
process. For example, after the original rudder axle is pressed and installed, the
inner hole shrinks. In order to load the steel ball, it is necessary to supplement the
reaming bore, which inevitably causes redundancy. After adjusting the tolerance,
the original drawbacks were eliminated. When processing valve core, piston, and
bushing, the burr should be strictly checked and controlled by microscope
according to assembly requirements.
The valve sleeve hole on the shell assembly is composed of several parts which
are combined and ground. The control of grinding sand is an important link in
controlling surplus. The original process is difficult to completely remove the
grinding sand deep inside the valve sleeve hole. If slightly neglected, over a long
period of time, the grinding sand will be solidified inside the valve sleeve and
cannot be cleaned, resulting in batch scrap. After improvement, the grinding sand
will not enter the inner depth of the valve sleeve hole. The grinding sand on the
Table 10.4 Faults of gas steering engine in pilot fire test
Serial
number
Number State
Fault
phenomena
Causes of failure
Solutions
1
01
Low
temperature
Valve core
stopping
Valve plate runs
out of control
during heat
treatment, contains
excessive
Austenite, and the
hole of valve
sleeve shrinks
during ignition
Strengthen quality
control of heat
treatment process
and check
metallographic
structure of valve
plate
2
02
High
temperature
Valve core
stopping
Wear of measuring
head results in
smaller mating
clearance between
valve sleeve and
spool
Improve the
measurement
method and
control the fit
clearance
3
03
High
temperature
Valve core
stopping
Valve spool is
burred
Strengthen the
control of
redundancy
4
04
Lifetime
Disqualification
of reaction time
symmetry
The opening of the
slide valve is not
symmetrical
Control the
symmetry of slide
valve opening
10.4 Process Technology of Gas Steering Engine
189