Die Casting clamping force is the force applied to a mold by clamping unit of HPDC die casting machine. The clamping force must be grater their separating force.

Which applied by the injection of molten metal into the mold

The clamping fore > separating force

How to calculate the separating force (opening force)?

Opening force is the force acting on the cavity to make the die expand during the production of die casting part. The opening force can be calculated by the following formula:


F: opening force

P: specific injection pressure

A: Total projected area

What is Specific injection pressure?

Molten metal is ladled through the shot hole into the cold chamber and the shot plunger pushes the metal into the die. The pressure applied by plunger to push the metal into the die is specific injection pressure.

Injection pressure use for different type of casting:

  1. For standard casting =600 kg/cm2
  2. For technical casting =600−800 kg/cm2
  3. For pressure testing casting =800 kg/cm2

What is projected area?

The anticipated region is a two-dimensional zone estimation of a three-dimensional article by anticipating its shape on the plane.

Total projected area =casting projected area + slide projected area + runner projected area + overflow projected area


  • Casting projected areas =56000mm2
  • Overflow + runner projected area =22400mm2 (40% of total casting projected area )
  • Slide projected area=projected area must be selected in the plane that is normal to be direction of core travel x tanꬾ

Angle of wedge = angle of finger cam angle + 2degree

Force FY = F X Tan ꬾ

ꬾ = angle of wedge lock


  • Slide core 1 projected area=area normal to direction of travel × tanꬾ

=5000× tan20 degree

=5000× 0.36

=1800 m2

  • Slide core 2 projected area=4500×tan 20degree= 1620mm2 so,

Total projected area= 56000+22400+1800+1620mm2

                                                                       =81820 mm2

What is separating force (Opening force)?

(For technical casting=600−800 kg/cm2)

(800 kg/cm2       =8kg/mm2)

Opening force = specific pressure ×total projected area

=8 kg/mm2 × 81820mm2

=654560 kg/mm2 (1 ton = 1000kg)

=654.56 T

Die clamping force

The clamping force must be grater then the separating force.

Locking force require =F×1.2


=785.472 tons

We select the 900T machine

What is fill ratio, how it is important for selecting machine tonnage?

It is the percent of liquid metal vulnerable chamber contrasted with the absolute volume of the virus chamber. Another method for saying it would be the level of metal contrasted with the level of air exposed to the harsh elements chamber

For Example

50% full (of metal) = 50% air remaining

The level of fill is significant in light of the fact that it is utilized to ascertain the ideal moderate shot speed.

This can have a quality impact on the casting.

Fill ratio (30-40%) is good for automobile die casting component quality.

A380 Aluminum Die Casting

Since the year of its inception in 1999, CNM Die Casting has consistently endeavoured for achieving sustained excellence in every sphere of its business. Though we started as a supplier of zinc die casting, we have diversified to aluminum die casting, recently. And this has borne rich dividends both in terms of customer satisfaction and company revenue.

Aluminum Die Casting That Provides Quality and Performance

We at CNM Die Casting’s aluminum department have a reputation of offering our customers the exact die casting aluminum specifications. This has been possible due to our state of technology studio, which is equipped with 21 machines ranging in clamping tonnage from 400 to 1200 tons. We cast aluminum castings up to 45 pounds in 360 alloys and up to 13 pounds in 380 alloys. Our aluminum and zinc departments use central melt furnaces and an efficient launder system to transfer molten metal safely and with the consistency of temperature necessary for process control. To complement our launder system, we have fully automated cells which assure shot to shot consistency like:

  • Aluminum Capacity, 10g to 125kg
  • Aluminum Die Cast Dies weight up to 30 Tons
  • Tymac Process Controls
  • Vacuum Assist
  • 4000kg. To 135,000kg. Furnace Capacity
  • ADC 12, 360, 380 Material, or any other special material base on customer requirement

Aluminum Die Casting Equipment That Delivers Excellence

Die casting aluminum is our forte and our cold-chamber die casting machines are typically used to conventionally die cast components using aluminum alloys.

In order to achieve high productivity and good dimensional accuracy, we at GC Die Casting are furnished with

  • 250 Ton Die Casting Machines

  • 400 Ton Die Casting Machines
  • 600 Ton Die Casting Machines
  • 800 Ton Die Casting Machines
  • 1000 Ton Die Casting Machines
  • 1250 Ton Die Casting Machines
  • 1650 Ton Die Casting Machines

A380 aluminum die casting is our speciality that provides an excellent combination of material properties and ease of production.

Aluminum Die Casting Equipment That Generates Cost Effectiveness

Over the last few years, St Clair die casting has offered its services of aluminum die casting components for a wide range of markets. This includes industry sectors like an appliance, automotive, electronics, and instruments etc. And the demand is only growing higher every day, the reason for this burgeoning need is our quality services coupled with prices that are best in the industry. Order with us to believe us! And we assure you long term dependability and quality.

To know more about our products and services, you can call our Customer Service by +86 3388 9978 or send us an email by sales@thediecasting.com