What are witness lines used for?

What are witness lines used for?

Witness Lines During Molding Whether along a parting line, or where a core pin seals off against a slide or other mold feature, injection molded material under pressure will be imprinted with the witness mark of two pieces of steel meeting one another.

What is witness line in Revit?

You can move witness lines to new references for temporary and permanent dimensions. You can also control the gap between the witness line and the element for permanent dimensions. Properties for witness lines are included with the type properties for permanent dimensions.

What is a dimension witness line?

When you create a dimension, the witness lines are created based on the dimension placement location and dimension references. These witness lines do not overlap with the reference geometry. You can manually drag witness lines for which automatic clipping is enabled so that they overlap with the reference geometry.

What is witness line molding?

Witness marks are dimples, burrs, raised ridges or other surface texture imperfections that may be found at one or more places on a molded part.

What are the application of casting?

Industrial Casting Applications

Metal Use Applications
Grey Iron 54% Automobile cylinder block, clutch plate, brake drum, machine tool beds, housings
Ductile Iron 20% Crank shafts, cam shafts, differential housing, valves, brackets, rollers
Steel 9% Machine parts, gears, valves

What is the importance of casting?

Metal castings will play a key role in the expansion of all renewable energy sources.” The casting industry is important for so many reasons. It supports other industries, small businesses, the global economy, the growth of the people who dedicate their time every day to building the industry and the environment.

What are the disadvantages of metal casting?

Disadvantages of metal casting

  • Relatively coarse surface finish and hence wider tolerance has to be allowed and not suitable for mating interfaces.
  • Metal casting such as shell moulding has a limit in terms of size and the pattern.

What is die casting pros and cons?

Advantages and disadvantages of die casting

  • High productivity.
  • Good dimensional accuracy.
  • Good surface finish: 2-100 µinch (0.5-2.5 µm) Ra.
  • Thin wall parts may be cast.
  • Very economical process at high volume production.
  • Fine Grain structure and good mechanical properties are achieved.
  • Intricate shapes may be cast.
  • Small size parts may be produced.

Why is die casting expensive?

That is because the initial outlay on die casting tooling can be expensive – so the unit cost savings don’t justify that investment until you get up to reasonable volumes. But with advances in tooling manufacturing, that breakeven threshold is coming down all the time.

What is the purpose of metal casting?

CASTINGS KEEP THE WORLD MOVING The solidified part is also known as a casting, which is ejected or broken out of the mould to complete the process. Casting can enable a complex part to be made in one piece often eliminating machining, assembly and fabrication steps.

Can you die cast iron?

The dies used in die casting are usually made out of hardened tool steels, because cast iron cannot withstand the high pressures involved, therefore the dies are very expensive, resulting in high start-up costs. Metals that are cast at higher temperatures require dies made from higher alloy steels.

How expensive is die casting?

Die cast tooling is relatively inexpensive. The price for a custom die will vary depending on the size and complexity of the component you need to produce. Costs typically range between £750 and several thousand pounds.

Why is it called Die Casting?

The actual term “die casting” does not have a complicated explanation. It basically comes directly from the process itself. It will be easier to start a little backwards, explaining “casting” first, and then “dies.”

How do I know if I have die casting?

There are many factors singular to the die casting process that are needed to be considered such as product strengths, draft angles, gate areas, material types, material flow, slide features, undercuts, wall thicknesses and material weights.

Where is die casting used?

Die casting is mainly used for large series production, i.e. for many components of the same type to be cast. Despite the high pressure used during the manufacturing process, a high casting quality is achieved.

What is the difference between die casting and injection molding?

Although there are some variations in technique, the major difference between die casting and injection molding is that die casting uses some kind of metal, often an aluminum alloy, as the raw material, while injection molding uses plastic or polymers.

Is Die-Cast plastic or metal?

In many ways, die-casting is similar to the plastic injection moulding that was used to manufacture the LEGO®. As the injection system and the die (mould) are both made of steel, most die-cast products are made from metals with lower melting points such as zinc, copper, aluminium, magnesium, lead and their alloys.

Is Die Casting more expensive than injection molding?

Die-Cast Advantages Depending on the metal alloy, die casting could be up to 30% cheaper than metal injection molding. The process can be used in a wide range of applications and industries. Dies can be used repeatedly. Processes can be fully automated, reducing labor costs.

What is die Moulding?

Molds (or moulds) and dies are used to make a variety of objects with many different media. Molds tend to be used to produce products that need to be hollow in the middle, whereas dies are used to stamp solid products out of media such as steel.

What is the difference between a tool and a die?

In metal stamping, a tool can be almost any mechanical device used to cut, form, support, or mold metals. Dies, on the other hand, are only those tools that functionally change the shape of the metal. Dies are typically the female components of a larger tool or press.

Why is Mould bad for you?

Moulds produce allergens (substances that can cause an allergic reaction), irritants and, sometimes, toxic substances. Inhaling or touching mould spores may cause an allergic reaction, such as sneezing, a runny nose, red eyes and skin rash. Moulds can also cause asthma attacks.

What is 3 plate mold?

A three-plate mold is used when part of the runner system is on a different plane to the injection location. This second parting plane enables the runners and sprue to be ejected when the mold is opened. In the following diagram of a three-plate mold, the runners will be ejected separately to the cavities.

What is the difference between two plate and three plate Mould?

The three-plate mold adds a movable middle plate, also called the gate plate, which is used for the mold of the pin point into the gate material. The two-plate mold is the simplest of the molds. Part of the cavity is on the moving mold, and the other part is on the fixed mold.

What does 3 plates weigh?

Two plates most often means two 45-pound plates per side of the bar, which including the weight of the Olympic barbell gives you a total weight of 225 pounds. Three plates, again, usually means three plates per side. Plus 45-pounds (which is how heavy the barbell weighs) gives you a total of 315 pounds.

Which gate is used in three plate Mould?

Reverse taper sprue gate (Pin gate): Generally used in three plate molds.

What is a 2 plate mold?

Two-Plate Mold Two-plate molds are the most commonly used type of injection molds. They consist of one parting plane and the mold splits at parting planes. In a multi cavity two plate mold, runner and gate must be in the parting plane to ensure that they can be ejected when mold splits.

What are the five parts that a two plate injection mold consists of?

The injection unit consists of a plastic-feeding hopper, a heated barrel (or “heating cylinder”), an injector, and an outlet nozzle. The injector is usually a reciprocating screw, but can also be a simpler hydraulic plunger-type device [Bry96].

What is a two plate mold?

Two plate mold is the easiest injection mold structure and has many advantages. It’s consist with A side and B side 2 main parts, when it is load in ejection machine to do molding, A side is fixed and held still, B side is movable.

What are the characteristics of mold?


  • Moulds are microscopic, plant-like organisms, composed of long filaments called hyphae.
  • When mould hyphae are numerous enough to be seen by the naked eye they form a cottony mass called a mycelium.
  • Reproduction in fungi is complex and involves a great diversity of structures.

What is a mold plate?

Mold “Gravity” Plate Analysis. Gravity plates provide a sample of mold spores suspended in the air of any room which may be inhaled. Inhalation is the primary mechanism for toxic mold exposure. Over a period of one hour, mold spores suspended in the air settle on the plate media.