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  1. #1
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,542

    Default Dismantling an injection moulding die

    I have been offered a small injection moulding die which I was going to disassemble for the steel. The cavity parts are supposedly P20. Would the rest of it be MS or P20 as well for strength? Any ideas how to check?
    Machining would use carbide or grinding I would guess. Will it cut with a bandsaw?

    Michael

  2. #2
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    5,080

    Default

    Hi Michael,

    I've been doing mods on Engel injection moulding machines recently, generally the dies machine easily with carbide tooling, Some are hardened, but the ones I've been working on aren't all that tough to machine. I'd guess no more than Rockwell 30, in other words you should be able to file it easily, and carbide tooling is a breeze.

    The nozzles I've made have been 4140, but not hardened. They tend to bed nicely into the bolster if left soft. The hydraulics make sure of that

    Ray

  3. #3
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    5,080

    Default

    Hi Michael,

    Talking to an injection moulding guy today, he seemed to think that P25 was the best choice for dies, and once through hardened, you couldn't touch them with anything much. There's a fair chance your die could be hardened 50 or 60 Rc.

    So I looked up P20, and the annealing procedure is heat to 760 to 790 C for 1 hour per inch of cross section, avoid surface carburization, then cool at a maximum of 22 degrees per hour. Annealed hardness should be 149 to 212 HB, ( less than 17 Rc )

    Ray

  4. #4
    Join Date
    Nov 2015
    Location
    Adelaide
    Posts
    27

    Default

    Toolmaker by trade here.

    Typically the fixed and moving halfs are made from P20 aka 618 or 718 and other associated names dependant on the steel supplier

    The build up, back plates, risers, ejector plates will be made from what ever, ms or p20, comes down to the shop that made the dies or the customers specs.

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