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1/4 Page No.: 110

Title: Texture & Roughness

Rev.: A

Created by: **** Approved by: **** Last Modified: 3.25.05

1.Mold surface roughness cross reference

2. EDM MACHINING ACCURACY VDI 3400(HASCO)

SPI (DME) Grade Ra(uin) Machining Method Comments

A1 0~1 Grade #3 Diamond Buff

A2 1~2 Grade #6 Diamond Buff A

Hig

h Po

lish

finis

hes

A3 2~3 Grade #15 Diamond Buff

1.for mirror or optical finishes 2.most time consuming and costly finishes to achieve 3.steel grade important to results(DME No.3 or No.5 STL recommended)

B1 2~3 #600 Grit Paper

B2 3~5 #400 Grit Paper B

Pape

r fin

ishe

s

B3 9~10 #320 Grit Paper

1.Removes all tool and machining marks 2.Provides good mold release 3.Light reflecting finish on molded part ,some sheen

C1 10~12 #800 Oil Stone

C2 25~28 #400 Oil Stone C

Ston

e fin

ishe

s

C3 38~42 #320 Oil Stone

1.Removes all tool and machining marks 2.Provides good mold release 3.Mute finish on molded part ,no sheen

D1 10~12 Dry Blast Glass Bead #11 (8Distance at 100 PSI,5Secs.)

D2 26~32 Dry Blast #240 Oxide (5Distance t 100 PSI,6ecs.) D

Dry

Bla

sted

fini

shed

D3 190~230 Dry Blast #24 Oxide (6Distance t 100 PSI,5Secs.)

1.For decorative finishes 2.Often used for die casting and thermoset tooling 3.Helps hide shrink marks and other imperfections 4.Dull non-reflecting finish on molded part or cast part

Grade 0 3 6 9 12 15 18 21

Ra(um) 0.10 0.15 0.20 0.30 0.40 0.55 0.80 1.10

Grade 24 27 30 33 36 39 42 45

Ra(um) 1.60 2.20 3.20 4.50 6.30 9.00 12.50 18.00

Kwik-Mold Inc. Moldmaking Guide

Kwik-mold is dedicated to building tools that enable you to mold high-quality part quickly and profitably

2/4 Page No.: 111

Title: Texture & Roughness

Rev.: A

Created by: **** Approved by: **** Last Modified: 3.25.05

3. preparation befor texturing(based on Mold Tech texture)

3.1 All the EDM or other machining marks must be removed;

3.2 texturing should be completed before other treatment ,such as anodizing or

nitriding;

3.3 the minimum finish of the surface to be textured is B3(polished by #320 Grit

Paper);

3.4 for the macro texture or that with a depth is less than 0.001,the surface must

be polished by #400/600 grit papers(B2/B1 );

3.5 special attention to drafting angle: (1)the Min. drafting angle of out surface of

small-sized part:1 over-sized part:3

(2)the relation of the roughness of a textured surface and drafting angle:

Ra drafting angle Ra6.3 4 Ra < 6.3 3

(3)one more 1 ~1.5 drafting angle is needed while the depth of outer surface texture is increased by 0.001.

(4) the drafting angle also is affected by the orientation of texture; (5) the textured insert,core pins or ejector pins must be oriented;

Kwik-Mold Inc. Moldmaking Guide

Kwik-mold is dedicated to building tools that enable you to mold high-quality part quickly and profitably

3/4 Page No.: 112

Title: Texture & Roughness

Rev.: A

Created by: **** Approved by: **** Last Modified: 3.25.05

4. Surface Roughness Produced by Common Production Methods

Kwik-Mold Inc. Moldmaking Guide

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4/4 Page No.: 113

Title: Texture & Roughness

Rev.: A

Created by: **** Approved by: **** Last Modified: 3.25.05

5.the surface test upon texturing

Kwik-Mold Inc. Moldmaking Guide