How to chosen steel impacts the quality of the mold?
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How to chosen steel impacts the quality of the mold?
How to choose the steel of 5 type mold level of SPI classifications? This is a common question if you want to build your plastic part from conception to the mass production.
Then firstly,you could read the below article for your reference. This is the 5 type mold level of SPI classifications.
You could unedrstand a rough knowledge of plastic mold levels.
http://www.deepmould.net/info/what-is-the-5-types-of-mold-level-of-spi-class-49933040.html
And then please follow the below directions for each of the mold level for your mold projects.
You could also find the steel requests,also design specifications of each level of the injection mold toolings.
SPI Class 101 Molds:
(Rated for one million or more cycles) Mold design required. Mold base should be a minimum hardness of 280 BHN. Molding surfaces (cavities and cores) must be hardened to a minimum of 48 RC,such as 1.2343 HRC 48-52. All other details such as slides heel blocks gibs wedge blocks etc. should also be of hardened tool steels. Ejection should be guided. Slides must have wear plates. Temperature control provisions to be in cavities cores and slides wherever possible. Over the life of the mold corrosion in the cooling channels decreases cooling efficiency thus degrading part quality and increasing cycle time. It is therefore recommended that plates or inserts containing cooling channels be of a corrosive resistant material or treated to prevent corrosion. Parting line locks are required on all molds.
SPI Class 102 Molds:
(Rated for no more than one million cycles) Molds design required. This mold is identical to the type 101 with the following items not required:Molding surfaces (cavities and cores) must be hardened to a minimum of 48 RC,such as H13 HRC46-48. Guided ejection hardened slide wear plates plated water channels and wear plated cavities. All other extras are optional. This tool is a medium to high production tool that is good for abrasive materials and / or close tolerance products.
SPI Class 103 Molds:
(Rated for under 500000 cycles) Mold design recommended. Mold base should be a minimum hardness of 165 BHN. Cores and cavities must be HRC 32-36 or higher. All other extras optional.
SPI Class 104 Molds:
(Rated for under 100000 cycles) Mold design recommended. Mold base can be of mild steel. Cores and cavities can be of P20 steel HRC 28-32. All other extras optional.
SPI Class 105 Molds: (Rated for no more than 500 cycles) The mold base may be constructed from cast metal or epoxy or any other material offering sufficient strength to produce the minimum prototype pieces,such as Aluminum. This tool is only for prototype purposes only. All other extras are optional.
Hope these points are useful for your plan.More questions, please feel free to contact with Deep Mould team.
