
Bayer Plastics has some good Information about surfaces and injection molding available on their web- Site.
在拜耳塑胶的网站上有一些关于表面处理以及注塑成型的好资料
According to a (German) Document the VDI surfaces correspond to the following Ra / Rz Values and require the following drafting angles:
依据一份(德国)文档,VDI 参数对应的Ra,Rz及拔模角度如下
VDI; Ra; Rz; DA-PA; DA-PC; DA-ABS
12; 0,40; 1,5; 0; 1,0; 0,5
15; 0,56; 2,4; 0,5; 1,0; 0,5
18; 0,80; 3,3; 0,5; 1,0; 0,5
21; 1,12; 4,7; 0,5; 1,0; 0,5
24; 1,60; 6,5; 0,5; 1,5; 1,0
27; 2,24; 10,5; 1,0; 2,0; 1,5
30; 3,15; 12,5; 1,5; 2,0; 2,0
33; 4,50; 17,5; 2,0; 3,0; 2,5
36; 6,30; 24,0; 2,5; 4,0; 3,0
39; 9,00; 34,0; 3,0; 5,0; 4,0
42; 12,50; 48,0; 4,0; 6,0; 5,0
45; 18,00; 69,0; 5,0; 7,0
DA-PA = Drafting Angle for Polyamide(PA拔模角度)
DA-PC = Drafting Angle for Polycarbonate(PC拔模角度)
DA-ABS = Drafting Angle for Acrilnitrile-Butadiene-Styrol(ABS拔模角度)
glass reinforced materials require more drafting
(玻纤?)强化材料需要更大的拔模角
Lorenz Wiedemar
- Langendorf, Switzerland
++++++
VDI换算方式如下:
VDI = 20log(10Ra)
James Lai
- JB, Malaysia
+++++++
Conversion scales from VDI.......RA......UM......RMS....I have a VDI Scale. Does anyone have such a conversion scale....Is the um a separate scale from the RA scale or is it part of it? If not how is the um expressed.
Pinocci
Joe Pinocci
equipment supplier - Warwick, RI
+++++++
VDI Table(完整的VDI表)
In the following, you can determine the roughness for your application according to VDI table.
根据下表,你可以得到你的产品的表面粗糙度
VDI3400 Ra = AA = CLA ISO1302 Rt
0-45 µm µinch N3-N10 µm
----- ----- ----- ----- -----
0 | 0.1 | 4 | N3 |
1 | 0.11 | 4.4 | |
2 | 0.12 | 4.8 | |
3 | 0.14 | 5.6 | |
4 | 0.16 | 6.4 | |
5 | 0.18 | 7.2 | N4 |
6 | 0.2 | 8 | |
7 | 0.22 | 8.8 | |
8 | 0.25 | 10 | |
9 | 0.28 | 11.2 | |
10 | 0.32 | 12.8 | |
11 | 0.35 | 14 | N5 |
12 | 0.4 | 16 | | 1.6
13 | 0.45 | 18 | |
14 | 0.5 | 20 | |
15 | 0.56 | 22.4 | | 3.2
16 | 0.63 | 25.2 | |
17 | 0.7 | 28 | |
18 | 0.8 | 32 | N6 | 5
19 | 0.9 | 36 | |
20 | 1 | 40 | |
21 | 1.12 | 44.8 | | 7.5
22 | 1.26 | 50.4 | |
23 | 1.4 | 56 | |
24 | 1.62 | 63 | | 12
25 | 1.8 | 72 | N7 |
26 | 2 | 80 | |
27 | 2.2 | 88 | | 16
28 | 2.5 | 100 | |
29 | 2.8 | 112 | |
30 | 3.2 | 125 | N8 | 20
31 | 3.5 | 140 | |
32 | 4 | 160 | |
33 | 4.5 | 180 | | 25
34 | 5 | 200 | |
35 | 5.6 | 224 | |
36 | 6.3 | 250 | N9 | 37
37 | 7 | 280 | |
38 | 8 | 320 | |
39 | 9 | 360 | | 46
40 | 10 | 100 | |
41 | 11.2 | 448 | |
42 | 12.6 | 500 | N10 | 60
43 | 14 | 560 | |
44 | 16 | 0 | |
45 | 18 | 760 | | 85
Qijin Wu
- Nanjing Jiansu Province, P.R.China
April 4, 2011
Nr is the number of roughness or the class, using VDI d
Nr=20*log(10*Ra)
Try with the equivalence table.
Aitor
Aitor Ruiz
| - Basq Country (north of Spain) |
MORE DETAILS ,PLS REFER TO BELOW LINK
http://www.finishing.com/307/63.shtml
