Sheet metal machining - Moulding
Moulding unites all operations performed to make profiling (boring, slotting, notching) and shaping to achieve the desired forms by pressing the deformations into the sheet metal permanently.
How moulding occurs
Moulding normally takes place using sheet metal, strips, and squares and can include several processing phases:
Mevar can perform all of these processing, presented on this website in detail.
All moulding operations take place using machines (presses and punches) and equipment (moulds), which have the function of transferring the blanking or deformation effort on the sheet metal processed.
Presses are machines that can generate continuous and progressive pressure with the aim of punching or deforming the material placed into the mould. These consist essentially of a foundation, a framework, guide columns, and motors to generate the strength and management systems and control of the moulding cycle. The immobile part of the mould is fixed onto the foundation, while the mobile part is connected to the press table of the framework.
The framework has the static function of counterbalancing the force impressed onto the mould, while the guide columns guarantee the perfect alignment of the fixed and mobile parts of the mould.
We have ten 20-tonne to 160-tonne mechanical and hydraulic presses
. Naturally the pressure to mould or punch varies based on the tonnage of the machine or the thickness of the part.
The precision and resulting moulding quality
are guaranteed thanks to routine checks and maintenance
after every process, in order to respect procedural standards.
This, along with our technical skills, reduces the rate of non-compliance to below 0.001%.
Type of press used
Depending on the method with which the applied force is generated, the presses can be mechanical or hydraulic.
Mechanical presses are used especially for sheet metal cold-processing for blanking and punching operations. The motor moves the flywheel through gears and belts and from the flywheel energy is transmitted through an engagement clutch with an eccentric shaft or with a crank that, through a rod, commands the ram course.
In the hydraulic presses the work is done by the action of a liquid under pressure. Hydraulic presses are preferable to mechanical ones when pressure needs to be kept constant for a certain amount of time: this happens above all in forming and deep drawing operations.
Press functioning: single and continuous stroke presses
Press functioning can be single-stroke or repetitive stroke. In the first case, the mould repeats the process following a command that is given promptly every time the punch stops after completing the previous cycle. In the second case, the press is equipped with an automatic mechanism that allows for dragging and straightening of the uncoiled sheet metal, automatically commanding the punch descent.