Matrix printing, casting

    Hello. My name is Sergey.

    I often use a 3D printer in my work and often try something new. I came across the technology of printing matrices and casting them. I was interested in it and I decided to try this method of small-scale production.

    For the implementation of the plan is very useful:

    1. object to pour
    2. 3D printer RK-1
    3. plastic casting
    4. autoclave (very desirable)

    The object in our case will be some kind of cover. Yes, it can be printed, but then it will need to be processed from the supports. In a single version, this would be suitable, but not now. Need to get 65 ready-made caps. You will say that you can make a silicone form and you will be right. *

    * Only you need not one form, but three whole pieces, approximately. Master model is also needed.

    The model with the gating system looks like this.

    I want to immediately make a reservation that such a sprue system is suitable for "long" plastics, the life time of which is about 20-30 minutes. If the lifetime is 2-5 minutes, then the item should be positioned horizontally.





    Based on the model with the gating system, we can easily and naturally get a matrix. 3D model of the matrix.

    Here, she, beautiful.



    It remains to send to the 3D printer, wait a bit (in this case, the clock) and the matrix is ​​ready.





    But, here it is right to pour right away, it is necessary to prepare a matrix. The first thing to do is to perform the illumination of the matrix (so that the polymerization is completed). The second is to process the matrix with a separator. For this, I use Blue WAX.

    Well, that's all, collect the matrix.



    And pour plastic.



    We wait about 10 minutes. It is during this time plastic fills the entire cavity.
    Once filled, put the matrix in the autoclave. Inflate it to 6 atm.

    After polymerization of the material. Extract the matrix and open it.



    We see that there is burr at the junction of the matrix, but this is not very critical, because its thickness is extremely small and is literally removed with the touch of a finger.



    Remains gating system.



    Front side of the cover.

    Instead of output (valuation):

    • The cost of the matrix - 700 rubles. (weight of both halves is about 100 g)
    • The cost of casting - 6 rubles. (at the cost of plastic 700rub / kg)

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