How do you set clamp force in injection molding?

The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area, on which this pressure is acting. There are variables that affect the clamping force calculation, like the material type (low-flow versus high-flow plastic), and the depth of the part.

What is clamping pressure in injection molding?

Clamping pressure is a measurement of the force needed to hold the mold closed during injection. If this pressure is not set high enough the mold will be forced open prematurely by injection pressure and will create flash on the related part.

How is clamping force calculated?

Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area, on which this pressure is acting.

How do you calculate clamping tonnage for injection molding?

T = A x cf. For example, the projected area of the molded part is 150 sq/in times a clamp factor of 3 (tonnage needed/square inch from material data sheet). 150 x 3 = 450 tons needed. If you are running in a 500-ton press, try starting at 450 tons.

What is a clamping force?

The amount of force applied to a workpiece by closing and locking a clamp is called clamping force. It is an important calculation because it allows a clamp to have adequate capacity to resist external machining forces.

How do you calculate screw clamping force?

Clamp load (lb.) is calculated by arbitrarily assuming usable bolt strength is 75\% of bolt proof load (psi) times tensile stress area (sq. in.) of threaded section of each bolt size. Higher or lower values of clamp load can be used depending on the application require- ments and the judgement of the designer.

How much clamping force do I need?

The maximum recommended clamping pressure for most joints is 250 psi. Putting all your muscle into many common clamp styles generates excess pressure that could force out most of the glue and produce a weak bond.

What are the two factors involved in clamping force?

1 Bonding. Factors affecting the eventual clamping force inside adhesive interconnections are the bonding force, and the shrinkage of the adhesive during curing and during cooling down to room temperature.

What is clamp force?

Clamping force is the force required to hold a part against the locators. ❑ The type and amount of clamping force needed to hold a part is usually determined by tool forces working on the part and the way the part is positioned in the tool.