变速箱壳体机械加工工艺设计外文文献翻译、中英文翻译、外文翻译

2021年1月26日发(作者：snaki)
Gearbox shell machining process design
《
Manufacturing Engineering and Technology
—
Machining
》

Mechanical Industry Press In March 2004, version 1 p560
—
564
（
Serope kalpakjian
）

（
Steven
）

Abstract
Gearbox shell is a more complex structure of spare parts box, its high precision,
complex
process,
and
the
processing
quality
will
affect
the
overall
performance
engine,
so
it
has
become
the
engine
manufacturer's
focus
parts
ing
process
planning
must
guarantee
the
machining
quality
of
parts,
to
meet
the
technical
requirements
stipulated
in
drawings,
at
the
same
time
should
also
have
high productivity and efficiency. Therefore, machining process planning design is an
important
work,
requires
designers
must
have
a
rich
experience
in
production
practice
and
wide
range
of
mechanical
manufacturing
technology
basic
theory
knowledge. In the specified procedure, should according to the production of parts
and
the
existing
equipment
conditions,
taking
the
processing
quality
into
account,
productivity and economy requirements, after repeated analysis and comparison, to
determine the optimal or the best solution.
cal Characteristics of the gearbox shell
The
gearbox
shell
process
features
are:
the
structure
of
complex
shape;
processing
plane,
more
than
holes;
uneven
wall
thickness
and
stiffness
is
low;
processing of high precision typical of box- type processing part. The main processing
of the surface of cylinder block top surface, the main bearing side, cylinder bore, the
main
and
camshaft
bearing
bore
holes
and
so
on,
they
will
directly
affect
the
machining accuracy of the engine assembly precision and performance, mainly rely
on
precision
equipment,
industrial
fixtures
reliability
and
processing
technology
to
ensure the reasonableness.
gearbox shell process design principles and the basis

Design
Technology
program
should
be
to
ensure
product
quality
at
the
same
time,
give
full
consideration
to
the
production
cycle,
cost
and
environmental
protection;
based
on
the
enterprises
ability
to
actively
adopt
advanced
process
technology
and
equipment,
and
constantly
enhance
their
level
of
technology.
Gearbox shell machining process design should follow the following basic principles:
2.1 The selection of processing equipment
The
principle
of
selection
adopted
the
principle
of
selection
adopted
the
principle of combining rigid-flexible, processing each horizontal machining center is
located
mainly
small
operations
with
vertical
machining
center,
the
key
process
a
crank hole, cylinder hole, balancer shaft hole High-speed processing of high-precision
horizontal
machining
center,
an
upper
and
lower
non-critical
processes
before
and
after
the
four- dimensional
high-efficiency
rough
milling
and
have
a
certain
adjustment range of special machine processing;
2.2 Concentration process principle
Focus on a key process in principle process the body cylinder bore, crankshaft
hole,
Balance
Shaft
hole
surface
finishing
and
the
combination
of
precision
milling
cylinder head, using a process focused on a setup program to complete all processing
elements in order to ensure product accuracy The key quality processes to meet the
cylinder capacity and the relevant technical requirements;
gearbox shell machining process design the main content
Gearbox shell complex structure, high precision, arge size, is thin-walled parts,
there
are
a
number
of
high
precision
plane
and
holes.
Engine
block
machining
process
characteristics;
mainly
flat
and
the
hole
processing,
processing
of
flat
generally use planing,
milling
methods
such
as
processing,
processing
of hole used
mainly boring, processing and multi-purpose drilling holes. As the cylinder complex
structure.
so
how
to
ensure
that
the
mutual
position
of
the
surface
processing
precision is an important issue.
3.1 The selection of blank
Gearbox
shell
on
the
materials
used
are
generally
gray
cast
iron
HT150,HT200,HT250,there
is
also
cast
aluminum
or
steel
plate,
this
engine
block
using high- strength alloy cast iron. Cylinder in the processing prior to aging treatment
in order to eliminate stress and improve the rough casting mechanical properties.
Improve
the
rough
accuracy,
reduction
of
machining
allowance,
is
to
improve
the
automated
production
line
system
productivity
and
processing
quality
of
the
important
measures.
As
the
foreign
box-type
parts
of
rough
quality
and
high
precision, and its production-line system has been implemented directly on the blank
line, not only eliminating the need for blank check device also saves the rough quality
problems due to waste of machining time, increase overall efficiency. Therefore, the
refinement of rough is to improve the productivity of the most promising way out.
For the engine block production line, can be rough in parts on-line pre-milling six face,
removing most of the margin, to facilitate direct on-line parts.
3.2 Machining process selection and processing of the benchmark
Choose the right processing technology base is directly related to the processing
quality
can
ensure
the
parts.
Generally
speaking,
process
benchmarking
can
be
divided into coarse and fine reference base.
3.2.1 Coarse reference base
The
baseline
for
the
on-line
thick
rough
,which
is
particularly
important
the
choice
of
benchmark
crude,
if
crude
benchmark
choice
unreasonable,
will
the
uneven distribution of machining allowance, processing and surface offsets, resulting
in waste. In the cylinder production line, we have adopted for the coarse side of the
base;
3.2.2 Fine reference base
Refined the base of this box for the engine block parts, the general use of
two
sales

a
full
range
of
uniform
benchmarks,
For
the
longer
automated
production positioning. In the gearbox shell of the process, we have adopted to the
side,
bottom
and
the
spindle
hole
positioning,
in
the
processing
center
on
the
process.
3.3 Machining Processing Stages and processes of the arrangements
Often
a
part
of
many
apparent
need
for
processing,
of
course,
the
surface
machining
accuracy
are
different.
Processing
of
high
precision
surface,
often
after
repeated processing; As for the processing of the surface of low precision, only need
to go through one or two on the list. Thus, when the development process in order
to
seize
the

high
precision
surface,

conflict,
the
reasonable
arrangement processes and rational division stage of processing.
Arrange the order
of the principle of process is: after the first coarse refined, the first surface after the
hole,
the
first
benchmark
other.
In
the
engine
block
machining,
the
same
should
follow this principle.
3.3.1 roughing stage engine block machining process
The
arrangements
for
roughing
process,
to
fully
carry
out
rough
rough,
trim
most of the margin in order to ensure production efficiency;
3.3.2 semi-finishing phase of the engine block machining
In
order
to
ensure
the
accuracy
of
the
middle
of
some
important
surface
processing,
and
arrange
some
semi-finishing
operations,
will
be
required
accuracy
and surface roughness of the surface of the middle of some processing to complete,
while demanding the surface of semi- finished, to prepare for future finishing;
3.3.3 The finishing stage
The
finishing
stage
of
requiring
high
accuracy
and
surface
roughness
of
the
surface processing; 3.3.4 secondary processing
Secondary processing such as small surface screw holes, you can finish of the major
surface after the one hand, when the workpiece deformation process little impact at
the
same
time
also
reduced
the
rejection
rate;In
addition,if
the
main
surface
of
a
waste,these small the surface will not have to be processed,thus avoiding a waste of
r,if the processing is very easy for a small surface bumps the main
surface,it
should
be
placed
on
a
small
surface
finish
prior
to
the
main
surface
finishing;
3.3.5 make proper arrangements for secondary processes
Make proper arrangements for secondary processes such as product inspection
process,in
part
roughing
stage,the
key
process
before
and
after
processing,spare
parts all the processing has been completed,should be appropriate arrangements.
Stage of processing division,has the following advantages:First,it can take measures
to
eliminate
the
rough
workpiece
after
the
stress,to
ensure
accuracy;
second,finishing on the back,and will not damage during transport the surface of the
workpiece
has
been
processed;again,first
roughing
the
surface
defects
can
be
detected early and promptly deal with rough,do not waste working most
small parts,do not sub very thin.
3.4 The gearbox shell surface of the main processing and secondary processes
3.4.1 Plane processing
Plane processing at present, the milling of engine blocks is the primary means of
planar
processing,domestic
milling
feed
rate
is
generally
300-400mm/min,and
foreign
2000-4000mm/min
milling
feed
rate
compared
to
far
cry,to
be
on
increasing,therefore,improve
the
milling
feed
rate,reduce
overhead
time
is
to
improve the productivity of the major means of finishing a number of plane engine
block when the milling feed rate to reach 2399mm/min,greatly improved efficiency;
Top
surface
of
the
cylinder
milling
is
a
key
process
in
the
process,the
flatness