Die casting machine open stroke is the distance the moving die (or part of the die) moves from one position to another during the die casting process.
This stroke links to die opening and closing. It is a key parameter for die casting machines.
A hydraulic system controls die movement during casting.
When the die casting machine starts to work, the moving die will move towards the fixed die and close the die to form a closed mold cavity into which the molten metal will be injected.
After the metal has cooled and solidified, the movable die moves again and opens the mold so that the casting can be removed.
The exact value of the open stroke depends on the design of the die casting machine and the structure of the die.
For example, in some cases, you may need to adjust the open stroke to match the die’s size and shape to ensure proper die opening and closing.
In addition, the die clamps’ travel can also affect the open stroke.
The clamps must provide sufficient clamping force to maintain die stability and accuracy.
Definition and parameter range of the mold opening stroke
The die open stroke describes the distance the pressurized casting machine’s die travels during opening to remove castings.
The parameters of the die open stroke vary among different types of pressurized casting machines:
- Typical parameter range: According to the evidence, the stroke range of the mold opening is wide. For example:
- Small machine: The stroke of the Haichen 25-ton cold chamber die-casting machine is 200mm.
- Large machine: The stroke of the Haichen HCD (880 tons) is 760mm.
- Super large machine: The stroke of the Haichen HCD 2080-ton is 1400mm.
- Technical requirements: The stroke of mold opening needs to be large enough to ensure the smooth removal of the castings, and it must also meet the minimum safety distance (such as the safety requirements when the stroke reaches 1/3).
The significance of the application of open stroke
In die casting machines, the open stroke is the distance the mold moves when it opens.
This parameter is critical to ensure product quality and productivity.
Here are some important applications and implications of open stroke:
Ensure smooth product release: A sufficient mold opening stroke ensures you can fully remove the product from the mold cavity after mold opening, preventing product or mold damage.
Affect the production cycle: the size and control accuracy of the mold opening stroke directly affects the entire die casting cycle.
Ldeal mold opening stroke can reduce the non-productive time in production and improve the production efficiency.
Mold design and protection: Reasonable opening stroke can reduce mold wear and prolong the life of the mold. Smooth movement of the mold during opening and closing helps reduce shock and stress.
Adapt to the production of different products: different products may require different open mold stroke.
The die casting machine is able to adjust the die opening stroke to adapt to the production needs of different products.
Improve the level of automation: in the automated die casting production line, accurate control of the opening stroke of the mold is very important for the realization of automated pickup and subsequent processing.
Reduced post-processing work: By precisely controlling the opening stroke of the mold.
This can reduce post-processing work needed after removing the product from the mold, such as trimming and sanding.
Energy saving and environmental protection: Optimizing the opening stroke reduces energy consumption, as unnecessarily large strokes increase the energy consumption of the machine.
How to calculate the open stroke required for die casting products?
To calculate the required open stroke for a die-casting product.
You must consider several key factors, including mold size, product size, mold opening and closing patterns, and die-casting machine capabilities.
Determine the maximum dimensions of the product: this includes the height, width and depth of the product.
Calculate the opening distance of the mold:
This value must usually equal at least the product’s maximum size to release the product from the mold.
Consider space for ejector mechanism:
If the mold has an ejector mechanism, additional space is required to ensure that the ejector mechanism can be fully extended.
Consider the safety distance of the mold:
In order to ensure that the mold does not collide when it is opened, a certain safety distance is usually added to the calculated stroke.
Calculation using the formula:
If the maximum thickness of the mold when closed and the maximum size of the product are known,
The following formula can be used to estimate the required mold opening stroke:
Mold opening stroke = Maximum thickness of the mold when closed – Maximum size of the product
Consider the mold design: Sliders, tilting jacks, and other mechanical devices in the mold design can also affect the required mold opening stroke.
Check the specifications of the die casting machine:
Ensure that the selected die casting machine has sufficient open stroke to meet the needs of the mold.
Simulation using CAE software:
For complex mold designs, simulation using CAE software can help to more accurately calculate the required opening stroke.
How do modern die casting machines control and monitor the die opening stroke?
Modern die-casting machines mainly rely on advanced control technologies, sensors and automation systems to control and monitor the opening and closing strokes of the molds in order to achieve precision and safety.
- Automation and Control Systems
- Sensors and Monitoring Technology
- Control of the mold opening and closing stroke
- Safety and Limit Switches
Automation and Control Systems
Modern die-casting machines typically employ automated control systems, such as programmable logic controllers (PLCs), to regulate the entire die-casting process,
Including the injection of molten metal, the opening and closing of the mold, and the removal of the parts.
These systems can monitor and adjust key parameters, such as temperature, pressure
And cycle time, in real time to ensure consistent casting quality and minimize human errors.
Sensors and Monitoring Technology
Various sensors have been installed in the die-casting machine to monitor and control key parameters.
For instance, sensors can monitor the flow and pressure in the hydraulic system, as well as the cavity pressure inside the mold.
These sensors can provide real-time data, helping operators monitor and optimize the die-casting process.
Control of the mold opening and closing stroke
The control of the mold opening and closing stroke is usually achieved through high-precision displacement sensors or servo valves to ensure the accuracy and stability of the opening and closing process.
In addition, some advanced die-casting machines also use non-contact sensors to detect the opening and closing position of the mold to improve the control accuracy.
Safety and Limit Switches
Various safety limit switches are installed in the die-casting machine to ensure the safety of the operator.
For instance, when the mold is not properly closed or there are potential safety hazards, the limit switches will prevent the machine from running.
Additionally, the safety door and the safety door limit switch ensure that no accidents occur during the operation process.
Safety Protection Measures
The design and control system of the die-casting machine also incorporate various safety protection measures.
Such as locking devices that prevent accidental movement during the mold opening and closing process, as well as emergency stop buttons.
These measures ensure the safety of the operators and the equipment.
The open stroke of Haichen machine
Below is the parameter table of our brand die casting machine, you can find all of them in our full range of catalog.
You can check the die stroke of each of our die casting machines against the table.
And you can match the die casting machine with different die stroke according to the design requirements of your own products.
If you need more similar technical support, please leave a message to us, we are ready to ask you to do the program calculation.
