设计指导方针: 液体硅橡胶 Molding

Our basic guidelines for liquid silicone rubber molding include important design considerations to help improve part moldability, enhance cosmetic appearance, and reduce overall production time.


大小

最大尺寸

大小 12 in. x 8. x 4.
体积 26 cu. in.
深度 不大于2英寸. from any parting line; deeper parts are limited to a smaller outline
预计模具区域 65.5 sq. in.
大小 304.88 mm x 203.2毫米x 101.6mm
体积 426064 cu. mm
深度 不大于50.8mm from any parting line; deeper parts are limited to a smaller outline
预计模具区域
42257.98 sq. mm

Typically, Protolabs can maintain a machining tolerance of +/- 0.003 in. (0.08mm) with a linear tolerance of +/- 0.01 in./in. (0.01 mm /毫米).

clear optical LSR medical part

 

 

材料

  • Standard silicone (30, 40, 50, 60, and 70 durometers)
  • 医疗级硅胶
  • Optical-grade硅胶
  • Fluorosilicone (fuel and oil resistant)


VIEW MATERIALS >


表面加工

完成 描述
PM-F0 non-cosmetic, finish to Protolabs' discretion

PM-F1

low-cosmetic, most toolmarks removed

SPI-C1

600粒砂石,10-12 Ra
PM-T1 SPI-C1 +轻珠爆破
PM-T2 SPI-C1 + medium bead blast
SPI-A2 grade #2 diamond buff, 1-2 Ra

草案

垂直的脸 0.5°
大多数情况下
最小关闭量
MINIMUM FOR LIGHT TEXTURE (PM-T1)
MINIMUM FOR LIGHT TEXTURE (PM-T2) 5°+

 

While 1 degree of draft is common in LSR parts, zero draft can occasionally be tolerated on shallow parts. The nature of LSR allows the rules of draft to be stretched more so than thermoplastics, if mold construction permits.

Adding draft angles to design, 甚至在LSR部分, helps facilitate ejection of a part from a mold, and improves overall moldability.

Adding draft angles to design, 甚至在LSR部分, helps facilitate ejection of a part from a mold, and improves overall moldability.


壁厚

Recommended wall thickness considerations for LSR molding:

  • 墙壁薄如0.010 in. (0.254mm) are possible, depending on the size of the wall and the location of adjacent thicker sections.
  • Rib thickness should be from 0.5 to 1.0 times the adjoining wall thickness.
  • The radii of inside fillets should typically be approximately equal to the wall thickness. 半径 that are much larger or smaller than this may cause porosity.
Proper wall thickness will reduce the risk of cosmetic defects in plastic parts.

Proper wall thickness will reduce the risk of cosmetic defects in plastic parts.


削弱了

LSR molding has the ability to produce parts with undercuts. Many simple undercuts can be easily removed by the press operator without mechanical assistance. Each part will be reviewed on a case by case basis for feasibility.

削弱了, 如上图所示, 可以复杂,, 在某些情况下, 阻止一部分弹射, so eliminate them if possible.

削弱了, 如上图所示, 可以复杂,, 在某些情况下, 阻止一部分弹射, so eliminate them if possible.

半径

Some part corners will have a radius rather than a sharp edge since we use an automated CNC milling process to make the mold for your parts. This typically does not require a change to your model, but resulting radii are identified before the mold is milled.


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