Surface finish (polishing and texture)

Common Surface Finishes for Plastic Injection Molds include Polishing ,Thin Fire Texture ,Texture,Plating,sand blasting

1.Polishing

The method to remove the convex part and machining marks on the steel surface, to obtain a smooth polishing effect, mainly realized by cutting. Whetstone, wool wheel and sandpaper, etc., are usually used mainly by manual operation.there are a popular standard for classify the polish levers:SPI (Society of the Plastics Industry)

Diamond Mold Polishing & Finishing Specifications

SPI-Finishing-Specifications
SPI-finish specifications
SPI-finish specifications

SPI finish plaque

SPI Finish A1, SPI Finish A2, SPI Finish A3, SPI Finish B1, SPI Finish B2, SPI Finish B3

2.Texture

Immerse the spray-printed and film-attached mold in the adjusted chemical liquid to corrode the bright part. After the corrosion, the mold surface is blackened and etched to different texture pattern

Mold Tech is a very popular texture standard in mold industrial, Below is description about Mold Tech texture depth and corresponding draft angle needed on mold surface.

Mold-tech-texture depth-and-recommend-draft-angle

3.Thin Fire Texture

After EDM processing, the texture is left on the plastic injection mold. Usually, electrode thin fire texturing is not specially performed due to the high cost.

CHARMILL VDI3400  Specification

No. Texture depthmm) No. Texture depthmm)
0 0.00040 21 0.00448
1 0.00044 22 0.00504
2 0.00048 23 0.00560
3 0.00056 24 0.00648
4 0.00064 25 0.00720
5 0.00072 26 0.00800
6 0.00080 27 0.00880
7 0.00088 28 0.01000
8 0.00100 29 0.01120
9 0.00112 30 0.01280
10 0.00128 31 0.01400
11 0.00140 32 0.01600
12 0.00160 33 0.01800
13 0.00180 34 0.02000
14 0.00200 35 0.02240
15 0.00224 36 0.02520
16 0.00252 37 0.02800
17 0.00280 38 0.03200
18 0.00320 39 0.03600
19 0.00360 40 0.04000
20 0.00400 41 0.04480
VDI3400-standard-on-steel
VDI 3400standard steel plaque
VDI-3400-plaque
VDI 3400 plastic plaque
VDI 3400 plastic plaque

4. Plating

The process that uses electrolysis to deposit metals or alloys on the surface of the workpiece to form a uniform, dense and well-bonded metal layer, i.e., electroplating.

5. Sand Blasting

Sand blasting is a process of workpiece surface treatment, which uses compressed air as the power to form high-speed injection that delivers the spray material to the surface of the workpiece to be processed, so that the surface appearance or shape changes.

sand-blasting

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