Drawing press is a wide definition of press machines and is also one of the most commonly used press machines in the manufacture sector. The classification of drawing varies but the mechanism focuses on the identical goal.
In modern mechanism, deep drawing is a sheet metal forming procedure by which a sheet metal blank is drawn into a forming die by the mechanical action of a punch machine or press machine. It is thus a shape transformation process with material retention nature. The procedure is considered “deep” drawing if the depth of the drawn part exceeds its diameter.
This process is achieved by redrawing the part through a series of dies, and the flange region would experience a radial drawing stress and a tangential compressive stress due to the material retention property. As a result, these compressive stresses result in flange wrinkles, and wrinkles can be prevented by using a blank holder, and the function of which is to facilitate controlled material flow into the die radius part.
No matter it is a conventional drawing press or the deep drawing machine, they are all widely used by any manufacturers in the production of a variety of industrial objects as well as items used in daily household basis. Regarding the industrial applications, many are applied to automotive, sports, consumer electronics, and household appliances.
However, here is a point to be noticed. Since the size of the die determines the corresponding sizes of the press machines to be used. As a result, generally, if manufacturers do require an item whose size is largely different from ordinary products, the scales of their hydraulic deep drawing machines would be different. To be precise, deep drawing has been classified into conventional and unconventional deep drawing processes. The main aim of unconventional deep drawing process is to expand the original formability limits of the work piece. Some of the unconventional processes include Aqua-drawing process, hydro-mechanical deep drawing, Hydro-forming process, just to name a few.
All these unconventional deep drawing operations are designed by press manufacturers for specific purposes and are subject to a great variety of changes. If compared with other press machines such as try out press and ordinary production press, the mechanical force of hydraulic deep drawing press machine would be much stronger because the primary task of this kind of machines is to make deep drawing on the work pieces no matter of its material essences.
High speed and massive production
Moreover, since drawing press machines are responsible for real and massive production of products, the mechanical strength are not only confined to the forces, but also to many other specifications. For instance, many hydraulic deep drawing press machines are equipped with heavy-duty emulsions, phosphates, white lead, and wax films in order to reduce the great force of friction that is caused during operation.
Producers of drawing press machines may use high tensile materials to achieve higher accuracy and to make the machines with better platen parallelism adjustment when the die is cutting work pieces under great pressure. Besides, modern hydraulic deep drawing machines are installed with many safety devices to ensure the safety of dies as well as onsite operators.
With a more complete protection for both onsite operators and die objects, the manufacturing of products are thus under better condition, promising preferable results to suppliers and customers. Many of the hydraulic deep drawing press machines are designed with acute characteristics especially on the rigid drawing phases, because it is necessary that the punches that cause cutting of one end hurt the corresponding other side of the die parts and this is “pressing joint”.
The discussion on how to make drawing machines productive is always a popular topic and with the invention of servo motors, this topic is now based on the servo technology rather than the traditional hydraulic way of thinking. In the metalworking shows lcurrently, there are many servo applications on how to integrate modern measuring technology together with the servo motor to make the drawing more accurate and fast, and most of all, makes it smart.