Resson Technologies RD-11M, Руководство по эксплуатации

Страница: 80 / 94

- 76 -
L
L X 1.005
function :
Because plastic material shrinks during cooling
after the the plastic injection process, therefore,
when making a mould for plastic injection, the
dimensions of the mould cavity have to be expanded
or reduced according to a "shrink factor", ie
for normal ABS material, the "shrink
factor" is 1.005.
Normally, the mould maker has to calculate all the
reduced or expanded dimensions prior to the
actual machining, marking down the dimensions
on the drawing. The pitfalls of this
method areas follows:
1) It is a very time consuming process
2) Because there are a lot of calculations, it is inevitable
that some calculation mistakes, or incomplete calculation
( some calculations are omitted by mistake ) occurs.
There is also no easy method of verifying the calculated
dimensions and it is too easy to make mistakes, subjecting
the operator to heavy psychological pressure.
3) Mould work has to be correct first time, bearing in mind
the cost of the product.
RD-11M provides the world's first practical "SHRINKAGE CALCULATION"
function to help the mould maker calculate the shrinkage and verify
the calculated expanded/ reduced dimension.
1. Entering the "SHRINK FACTOR"
All the shrinkage dimensions are actually the multiples or divisions of a shrinkage factor, the shrinkage
factors change for different plastic material.Before machining the operator must enter the shrink factor
into the
RD-11M.
Example : For material ( ABS plastic ), the shrink factor is 1.005.
R
esson
Technologies
On Off
RD-11M
R
esson
Technologies
ent
R
I
O
ABS
5.000
On Off
RD-11M
R
esson
Technologies
ent
R
I
O
SHRINK
1.005
123.450
23.450
ent