They should be placed at the maximum stress point of the plastic product. My Ruger Vaquero 45, had undersized cylinder throats Bill Ruger designed them that way so you would not lose the pin in the field Ruger New Model Blackhawk Convertible 45LC/45 Auto Stainless Revolver with 4 When the New Vaquero came along, it had a pin with a shorter head like a Colt so the pin could be removed without removing the ejector housing Cylinder Cylinder. The number of ejector pins should be increased, along with an increase in their diameter.The air should be allowed to escape from the mold ventilation to keep the plastic from improper filling and burning. To release trapped air from molds, proper ventilation is necessary.Make sure the gates and runners of the mold are balanced.If the draft angle is small or absent altogether, an increase of 0.5 degrees draft angle from the vertical angles is recommended.
These agents help form a barrier between the two surfaces. Appropriate mold release agents can be used for easy removal of the moulded product from the mould.This would make way for an optimum amount of melt into the mold. While injecting, the pressure should be lowered as well. The melt should be injected into the mold in proper amounts to ensure evenness and less stress and strain throughout.Even with new molds, there would be flashings on the part to an extent on the ejector pins and hence they especially get addressed at the start of large-scale projects. Removing the ejector pin flash from the casting is another key aspect, which is considered in the design phase. However, they may be flattened or crushed as specified by the die casters – both may come off in thin pieces when the component is put to use. Usually, pin flashes won’t be removed except it hampers the function of the end product. However, more tolerances may be required for ejecting large castings properly.Įjector pin marks on the casting would also be surrounded by flashings. The pin marks on most of the castings may be depressed or raised by 0.015 inches – foundries prefer the latter for achieving optimal production. Their size, volume alongside placement, and the number of bosses needed would differ according to the size and the geometry of the part and other aspects in die cast mold making. In situations where the surface finishing is important, the placement of knockout pins is discussed before designing the die. Determining where to place the ejector pins is at the discretion of the die casters but customers’ consensus is also considered in co-design. Their placement inside the casting machine needs to be discussed early on to avoid die revisions. They also help in keeping the die cast parts from bending. However, the cyclical process of manufacturing another casting would resume.Īpart from knocking out the solidified casting from the die, ejector pins would leave pin marks on the component. Once ejected from the machine, the casting would be removed from the sides of the knockout pins with the use of robots. With force, the pins also advance causing the casting to eject from the mold cavity. Pushing the ejector pins forward is a plate placed inside the movable half of the casting. Once the solidified mold ejects from the machine, the casting stays on the mold cavity as the component and the drafts are tailored for the same task. Also known as knockout pins, they are attached to the movable half of the casting known as the ‘ejector half’ in order to push out the casting from the mold cavity. Ejector pins are an important aspect of designing and molding phase of die cast mold making with aluminum.