SU1177046A1 - Injection die for die casting - Google Patents

Abstract

PRESS FORM FOR CASTING UNDER PRESSURE, containing fixed and movable half-forms, insert-knife for trimming the sprue, fixed in the movable half-form and forming a feeder, characterized in that, in order to simplify the design and increase the manufacturability of the manufacture of the press mold, insert secured with bolts, on the lateral cylindrical surface of which grooves for the insert-knife are made.

Description

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The invention relates to foundry, in particular to the production of castings from non-ferrous alloys by injection molding, and can be used in the molding of plastic articles;

The purpose of the invention is to simplify the design and improve the manufacturability of the mold.

FIG. 1 shows the mold at the end of the pressing process. The metal cut; in fig. 2 shows section A-A in FIG. tj in FIG. 3 shows a mobile half-mold at the moment of ejection of the casting in FIG. 4 shows section BB in FIG. 3

The mold consists of a movable half-form 1 with ejectors 2 and a fixed half-form 3 with a pressing chamber 4 and a piston 5.

The movable mold 1 is provided with a knife insert 6 located across the feeder 7 and secured with rolling bolts 8. The knife insert 6 forms the feeder 7 from the plane of the die section of the mold. The blade of the insert-knife 6 protrudes beyond the mold section line by the magnitude of σ, which provides local delamination of the feeder 7 in the separation zone of the casting 9 from the sprue 10. The movable half-form 1 has a rounded (or inclined) section 11, which ensures unhindered removal 9 sprues 10. The rolling bolts 8 have milled grooves 12 for installing the insert-knife 6. In the pressing chamber 4, a window 13 is made for pouring metal.

Mold for injection molding works as follows.

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The molten metal is poured into the pressing chamber 4 through the window 13 and includes moving the piston 5 to the left. In this case, the liquid metal completely fills the internal cavity of the mold. After crystallization of the metal, molds 1 and 3 open and push the castings out of the mobile. half-molds 1, ejectors 2. In

During the ejection, the casting 9 with its feeder 7 bumps into the fixedly inserted insert-knife 6, the feeder 7 in the notch zone breaks, and the casting 9 separates from the sprue 10.

Simultaneously with the lhs-nick 10 can be separated (with appropriate knives) and washers (not shown). Mount insert-knife 6 in the movable half-form 1 using boltovskalok 8, on the lateral cylindrical

the surfaces of which are made with the grooves 12, makes it possible to simplify the manufacturing technology of the mold. Insert 6, rolling bolts 8 do not require

for its manufacture of manual labor. In addition, it is much easier to replace the insert of the knife 6. It does not require disassembly of the entire mold. When the blade is blunt

the knife insert 6 can be reground, and the resulting increase in the cross section of the feeder 7 is compensated for by grinding the side face of the leather 6 from the blade side, which saves high alloy steels.

The invention allows to simplify the design of the insert-knife and its fastening in the movable half-form, to improve the manufacturability of the manufacture of the mold, to simplify its maintenance.

Claims (1)

PRESS-FORM FOR PRESSURE CASTING, containing a fixed and movable half-mold, an insert-knife for trimming the gate, fixed in a movable half-mold and forming a feeder, characterized in that, in order to simplify the design and improve the manufacturability of the mold, the insert is fixed with bolt-rolling rods, on the lateral cylindrical surface of which grooves are made for the insert-knife. ¹ 1177046