polishing (or lapping) injection moulds

[stedracu]

Bye to all,
I'm a molding technician, and I'm in trouble with some molds right now.
we print parts for the automotive industry, including some pmma lenses.
the surface of the mold must be polished in mirror, but unfortunately I have some scratches and the so-called " orange peel " that are not accepted.

Unfortunately I do not have much experience in the maintenance of the moulds, so I am asking for advice on how to carry out a polishing or manual lapping to remove all the scratches and regain the mirror surface.
I have tried to polish with 400 stone, then 600, then 800, then 1500 smeriglio paper, then 9 micron, finally paste with diamond 8, 2 and 1 micron. but not all. should I use wood (like balsa) to get the surface I want?

If anyone can explain in detail the various procedures or direct me to some links.

thanks in advance to all.

 

[SHIREN]

Bye to all,
I'm a molding technician, and I'm in trouble with some molds right now.
we print parts for the automotive industry, including some pmma lenses.
the surface of the mold must be polished in mirror, but unfortunately I have some scratches and the so-called " orange peel " that are not accepted.

Unfortunately I do not have much experience in the maintenance of the moulds, so I am asking for advice on how to carry out a polishing or manual lapping to remove all the scratches and regain the mirror surface.
I have tried to polish with 400 stone, then 600, then 800, then 1500 smeriglio paper, then 9 micron, finally paste with diamond 8, 2 and 1 micron. but not all. should I use wood (like balsa) to get the surface I want?

If anyone can explain in detail the various procedures or direct me to some links.

thanks in advance to all.

you are at the first msg
maybe a moment of presentation at the forum would have been appreciated

the diamantatura obtained with wood, fibers, felt and diamond paste

then there are ultrasound
I think with manual techniques maybe you already got the max
Thank you very much

 

[Dade73]

orange peel can be caused by injection problems (usually the piece is "carved").
Mirror polishing is performed with the procedures listed by you, and works if done correctly.
the polished surface will eventually speculate as a chrome if well executed.
If in the mold there are scratches, you will have to "dig" with canvases or coarse stones to level you on the floor of the scratch.
the diamond paste uses it with a good cotton hydrophilic, and keeps always washed the superice to polish between a passage and the other