Irregular surface workpiece stamping on the template

The reason why the bronzing of the curved surface is not easy is that the stencil on the bronzing is difficult to be machined to match the workpiece completely, resulting in uneven pressure. Even if it is processed with a numerically controlled lathe, the bronzing silicone rubber plate will appear unnatural after being applied. Where it fits. However, if the bronzing silicone rubber is directly cast onto the surface of the upper stencil to make a bronzing upper stencil, the imperfections in the processing of the aluminum dies can be greatly improved, thereby improving the bronzing quality.

For example, a surface of a spherical ABS plastic workpiece with a radius of 15 mm is bronzing. The hot stamping stencil can be produced by the following method:

1. Select a piece of aluminum with a size of 30mm x 30mm x 50mm and work out a concave surface with a shape similar to that of the bronzing on the milling machine.

2. Apply a layer of QB6203 high temperature silicone rubber adhesive on the concave surface.

3, preparation of hot glue. Put TP623 (bronze silicone rubber), T40 (curing agent), 3205 (softening agent), white carbon black (reinforcing agent) into a 1000 ml PP plastic cup, stir well, place it in a vacuum pump and vacuum it. After 10 minutes, remove the glue.

4.Pour the hot stamping glue into the groove of the aluminum mold, apply a layer of wax release agent on the workpiece hot stamping surface, put it into the glue, keep it for several minutes, and control the workpiece and the aluminum mold at the same time. Between the silicone rubber layer is 5 ~ 7mm.

5. Curing - The upper mold plate is placed in an oven for curing. The temperature is controlled at about 1200°C for 30 minutes. After removal, it can be used for bronzing. The bronzing stencil made by this method has a very good surface bronzing effect.