punching die
The punching die, on the other hand, shapes thin metal sheets in their cold state. The upper die moves up and down with a hammer to press the material into shape.
The tools are made of heavy-duty materials and the handles are double-dipped for added strength.
Common Structures
Various structures are used in punch moulding, ranging from the simplest to the most complex.
combined structure
Common structures include integral embedded structure, shaped rod, and combined structure. In this way, processing of the plastic part is made easy. For small-sized and simple-shaped parts, the integral embedded structure is most suitable. However, this structure is not suitable for complicated shapes and inner surfaces.
Punch moulding tools also have various types of punches. These include inch, metric, and thread form punches. They also feature inserts and ejector pins. They are bonded together by heat and pressure.
This circular movement is accompanied by auxiliary compressions. This process is also known as “punch-and-die” moulding. This process produces composite parts that are as strong as those made of metal.
Generally, materials with higher glass content require higher pressure while simpler geometric shapes require less pressure. Additionally, they require less post-fabrication machining than metal parts.
Positioning
The main difference between these two structures is in the positioning and axial movement of the punch members. The upper punch members are rotated, while the lower ones remain parallel. The material composition and reinforcing fibers will determine the flow of the material, which in turn determines the mechanical performance and quality of the part. However, the high glass content of a part can be offset by a higher coverage charge. Among the many material types used in compression moulding, thermosets are the most common. This type of material consists of a polymer matrix made of layers of fiber reinforced plastics.
structures
Common structures of punch moulding are illustrated in the figure below. In a lamination structure, the upper punch block 51 holds the upper punch members 201 to 217. The middle die block 52 holds the die cavities 401 to 417 and the lower punch block 53 holds the lower punch members 301 to 317.
This system applies a force directly to the drawing punch. The hydraulic system includes a relief valve and a 20 MPa hydraulic pump. Some punches also feature ball lock dies, shoulder relief, piercing, and lancing punches.
The components of a punch moulding process are often shaped with special tools called a mould. The drawing and blanking tools used in punch moulding are highly accurate, with tolerances of up to 0.001mm.
The metal parts are either deformed through plastic deformation or destructive deformation. In addition to that, the drawing and blanking tools use ultra-small compression-type load cells that have 50 N capacity.