铣削机械加工外文翻译中英文翻译机械类外文文献翻译Word格式文档下载.docx

铣削机械加工外文翻译中英文翻译机械类外文文献翻译Word格式文档下载.docx

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multiple-tooth

used

so

that

metal

rate

high,

frequently

desired

obtained

single

pass

The

tool

milling

known

It

usually

consists

cylindrical

body

rotates

on

its

contains

equally

spaced

peripheral

teeth

intermittently

engage

cut

workpiece.

1

extend

part

way

across

one

or

both

Ends

cylinder.

Because

principle

provides

rapid

can

produce

good

finish,

particularly

well-suited

for

mass-production

work,

excellent

machines

have

been

developed

this

purpose.

However,

very

accurate

versatile

Machines

general-purpose

nature

also

are

widely

jobshop

die

A

shop

equipped

with

machine

an

engine

lathe

almost

any

type

product

suitable

size.

Types

Operations.

operations

be

classified

into

two

broad

categories,

each

has

several

variations:

1.

located

periphery

body;

parallel

rotation

Both

flat

formed

surfaces

produced

method.

cross

section

resulting

corresponds

axial

contour

This

procedure

often

called

slab

milling.

2.

face

at

right

angles

combined

result

actions

portions

2

major

portion

cutting

done

providing

finishing

action.

concepts

illustrated

Fig.

16-1.

Peripheral

performed

having

horizontal

spindles,

whereas

horizontal-

vertical-spindle

machines.

Surface

Generation

Mimng.

Surfaces

distinctly

different

methods

depicted

16-2.

Note

up

againsi

feed

workpiece,

down

same

feed.

As

shown

16-2,

method

chip

quite

cases.

c

hip

thin

beginning,

where

tooth

first

contacts

increases

thickness,

becoming

maximum

leaves

tends

topush

work

along

lift

upward

Tool-work

relationshios

table.

action

eliminate

effect

looseness

screw

nut

table

results

smooth

cut.

loosen

clamping

device

greater

forcers

must

employed.

addition,

smoothness

depends

greatly

sharpness

edges.

milling,

thickness

cecum

close

point

relative

motion

pull

cutter,

all

possibility

eliminated

if

used.

should

never

attempted

not

designed

Inasmush

yields

approximately

tangential

end

engagement,

there

much

less

tendency

machined

show

marks

than

when

Another

considerable

advantage

force

hold

against

table,

permitting

lower

3

advantageous

taking

heavy

cuts.

Sometimes

disadvantage

strike

beginning

chip.

When

hard

surface,

such

castings

do,

may

cause

dull

rapidly.

Cutters.

cutters

ways.

One

group

them

classes,

based

relief,

follows:

1.Profile-cutters

relief

provided

grinding

small

land

back

edge.

edge

straight

curved.

2.In

form

cam-reheved

eccentric

curve

behind

edge,

thus

relief.

All

sections

Cutters

sharpened

only

teeth,

remaining

unchanged.

useful

classification

according

mounting

Arbor

those

center

hole

they

mounted

arbor.

Shank

either

tapered

integral

shank.

Those

shanks

directly

spindle,

straight-shank

held

chuck.

Facing

bolted

stub

common

types

cutters,

system

Hain

disk-shaped,

helical

periphery.

They

surfaces.

operation

plai

n

Each

engages

gradually,

more

cuts

given

time.

reduces

shock

chattering

tendencies

promotes

smoother

surface.

Consequently,

preferred

over

teeth.

Side

similar

plain

except

radially

ends

cylinder

toward

:

center.

helical.

Frequently

these

relatively

narrow,

being

disklike

shape.

Two

side

arbor

make

simultaneous,

cuts,

straddle

Interlocking

slotting

consist

mills,

but

made

operate

unit

slots.

adjusted

width

inserting

shims

between

them.Staggered-tooth

narrow

staggered

alternate

opposite

helix

angles.

ground

periphery,

clearance

protruding

side.

These

free

makes

particnlarly

effective

deep

slots.Metal-slitting

saws

thin,

1/32

3/16

inch

thick,

their

sides

slightly

"

dished"

provide

prevent

bindin