Production of parts from epoxy resin. Drawing, description

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Production of parts from epoxy resin. Tips for the home master

Builder, home master

There was a time when a cracked radio knob, a split car gear knob forced me to look for a replacement in stores, and, I will not hide, often unsuccessfully. I tried to carve them from various plastics or metal, but this work was laborious and time consuming. In addition, it was far from always possible to bring the homemade product to full compliance with the lost original.

The search for an acceptable way to restore a wide variety of plastic parts eventually led me to the idea of \uXNUMXb\uXNUMXbusing epoxy for that purpose. It turned out to be an ideal starting material: it is not difficult to “cast” almost any part from it. Ordinary gypsum turned out to be the best shaping material.

When making the form, I adhered to the following technology. To begin with, I picked up a box made of metal or plastic - most often it was a soap dish. Then he filled it (with preliminary lubrication of the inner surface with a thin layer of technical vaseline) up to half with gypsum mortar and immersed in it about half the vaselined part, from which the copy was made. Without waiting for the complete curing of the gypsum, two or three holes were made on its surface with a thin metal spatula.

After the final setting of the gypsum, its surface was again smeared with petroleum jelly and a new portion of gypsum was poured, which completely covered the sample part. Before the last pouring, I put plastic inserts into the mold, forming sprues and sprues.

Production of parts from epoxy resin
Rice. 1. Making a gear shift handle from epoxy resin: A - cracked handle; B - production of the lower half-mold: 1 - bolt, 2 - standard handle, 3 - fixing hole, 4 - box, 5 - plaster; B - manufacturing of the upper half-mold: 1 - bolt, 2 - plaster, 3 - insert for the thrust, 4 - insert for the sprue, 5 - standard handle, 6 - box; G - pouring epoxy resin into the mold; D - finished "casting"

Production of parts from epoxy resin
Rice. 2. Making a handle for a screwdriver: A and B - upper and lower half-forms; B - a screwdriver with a finished handle

When the plaster hardened, the mold was disassembled, the sample and plastic inserts were removed from it. In a clean and dry container, the epoxy resin was thoroughly mixed with a hardener (in a ratio of 8: 1), and a dry pigment of the desired color or nitro paint was added to it. Resin was poured into the sprue until it appeared from the extrusion. A day later, I dismantled the form, extracted a copy part from it. It turns out to be almost ready - you just need to remove the sprues and bulges and clean the seam of the mold connector.

If the part has an internal hole, this must be taken into account during mold preparation. If, for example, the handle is intended for a screwdriver, then during the manufacture of the casting, the steel rod of the tool is inserted into the mold. If a threaded hole is needed inside, then a bolt covered with a thin layer of grease is placed in the mold, it is then easily removed from the casting.

Author: A. Kornev

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