Brief Analysis of Design and Manufacturing Elements of Blow Mold

Update:05-06-2018
Summary:

Brief Analysis of Design and Manufacturing Elements of […]

Brief Analysis of Design and Manufacturing Elements of Blow Mold

The material used to make the mold must have high thermal conductivity and sufficient cutting edge strength. The current aluminum 70/75 is a high-grade alloy for most molds. Due to the good machining performance of the metal, the mold cavity is usually machine cut. Copper alloy molds also have high heat conductivity and good corrosion resistance.

    The design and manufacture of blow molds with crate injection mould fast circulation and long life are required for the development of the blow molding industry. The factors that determine the efficiency of the mold are: l) material; 2) cooling; 3) cut billet design; 4) exhaust.

    The material used to make the mold must have high thermal conductivity and sufficient cutting edge strength. The current aluminum 70/75 is a high-grade alloy for most molds. Due to the good machining performance of the metal, the mold cavity is usually machine cut. Copper alloy molds also have high heat conductivity and good corrosion resistance. However, its high cost, high price, and because of its three times the proportion of aluminum, may be more serious wear on the molding machine. Steel alloy molds are easy to repair by welding or mosaic.

    Cast aluminum molds have lower thermal conductivity than aluminum molds. The cut-out of the mold cavity usually requires copper alloy or stainless steel inlays, because the strength and hardness of the cast aluminum can not meet the cutting edge requirements.

    Kirk alloy (zinc) castings can be made on steel masters. The cavity and the bottom plate are cast to a certain size. Because the strength of Kirk alloy is not enough to cut off the plastic, the operating hole and shoulder area are inlaid with copper alloy or stainless steel. The bottom and neck are also inlaid with these two metals. Casting molds can also be cast from copper alloys. Casting steel cavities is easier because it is based on pressure or gravity casting. These cavities have many fine parts produced from steel masters or ceramic dies.

    Cooling has a challenging and very important significance in the mold design. Drilled cooling lines are installed where cooling is most needed. For better production control, most molds are designed with several independent cooling zones. The neck and bottom require the most heat to be expelled and thus require the most effective cooling.

    Cut the billet. The design depth of the cut blank area may be a significant factor in the production and quality of components. Cut billet area is where excess plastic enters the part when the part blows. The type and shape of the billet may determine the welding of a component. String 6

    For harder resins, it is necessary to use steel or copper alloy as the blank material. Sometimes the billet area is blown with air to accelerate the plastic cooling, remove excess material, and prevent component distortion.