Cause Die Casting Parts Less Cast The Reason You Know What

Cause Die Casting Parts less cast the reason you know what

Die Casting Parts in the production process, will encounter many quality problems, that is, as a common quality defects Die Casting Parts, which is one of the defects that cast, Die Casting Parts which led to the casting of the reasons for the lack of casting, according to know the analysis is as follows:

Die Casting Parts process, some parts of the filling is not complete, known as less cast. When the under-cast part of the serious, can be used as the shape of the casting does not meet the requirements of the drawings to look at. Often it is not allowed to exist.

The reasons for the lack of casting are:

1) poor filling conditions, undercover parts were irregular condensed metal;

When the pressure is not enough, Die Casting Parts the front of the activities of the metal solidification prematurely, resulting in corner, deep, thin wall (even thinner than the average wall thickness), cylindrical hole wall and other parts of the poor cast.

Mold temperature is too low;

Alloy pouring temperature is too low;

The gate position is not good, the formation of large activity resistance.

2) gas obstruction, Die Casting Parts undercoating parts of the surface lubrication, but the shape of irregular

It is difficult to set up the site of the overflow system, gas accumulation;

When molten metal is active, the turbulence is intense and the roll is rolled.

3) plastic mold cavity with residue

The amount of paint or spray method improperly, resulting in local coating deposition.

Molding parts of the mosaic gap is too large, Die Casting Parts or sliding cooperation gap is too large, when filling into the metal, casting out, and can not be completely out of the sheet and clip in the gap. When the sheet metal (metal sheet, the thickness of which is the size of the gap) and convex around the surface more, in the case of mold will be protruding height into a wall thickness suitable for casting The future castings produce trenches that penetrate (for wall thickness) there. This penetrating groove becomes a special form of undercuts. This kind of under-casting phenomenon occurs in the case of deep cavity composed of mosaic.

Insufficient pouring (including excess material section too thin).

Vertical die-casting machine, the injection, Die Casting Parts the lower punch down to open the nozzle orifice is not enough, resulting in a series of poor filling conditions.