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Link motion presses are mechanical press machines that uses link motion press set to drive the whole parts together so that if the forming requires deeper depth or complicated forming motions, the link motion presses can do better compared to conventional mechanical presses up to 40% higher regarding the productivity.
Link motion drive is the key to the link motion press, which involves gearwheel, crank, triangle link motion part, link motion rods, and other related designed parts. The full name of a link motion press is actually more like mechanical link motion press, since this type of press machines belongs to mechanical presses rather than hydraulic models.
With the sliding motion curve analysis, it is shown that the motion curve of link motion presses can generate slide motion velocity decreasing effect, which happened before the sliding approach, to that the rated tonnage point is about 30% high. Most mechanical presses have an average material flow that during the non working portion of the stroke, the flow may increase by the offsetting value in order to maintain the high production ratios. Such effect is precious because it is superior in quality as well as faster speeds, which not only benefits to high speed motions but also to slow motion works. During the slow motion working mode, the design of this type of mechanical press reduces die impact as well as punch penetration along with snap through rates. Furthermore, noise and vibration volumes are also reduced to a significant extent, which can help increase the lifespan of machines.
For constant sliding velocity, the deep drawing velocity during operation by link motion drives help the mechanical presses reduce slide velocity with the design of press strokes, and the effect is, the work piece can be well stretched and formed without the danger of tearing. With this regard, the work piece quality and side wall thinning are both greatly improved.
If the working inclination is designed as progressive die type, the motion is developed to enhance the progressive die working action, and the progressive die link motion press not only can help reduce the sliding velocity, but also to increase the value of metal plasticity and the forming competences into a high and better level. With the enhanced metal plasticity, there are five important benefits that can encourage people to use this type of machines. First of all, the progressive die type can help achieve the desired shapes with no double striking during the coining works. Secondly, there will be high SPM in the shallow draws. Thirdly, the in die tapping works are with significant higher SPM. Fourthly, during the forming jobs, the spring backs are lowered. Last but not least, there will be less cracking. These five benefits grant a lot of operation advantages to the operators. Even though the machine construction is much expensive, the overall performance in complicated deep processing would be much more productive.
Mechanical presses are a rather late innovation in the metal forming industry. After hydraulic press machines, this innovation is a popular forming machine in the metal forming industry that is widely applied in the working cycle that requires fast cycle time. Like servo press, mechanical presses and servo presses are press machines driven by mechanical motors which are widely applied as well as the hydraulic presses and each of them represents different mechanical advantages. Link motion drive could be considered as a servo device. This type of driving advances the existing hydraulic solutions.
But mechanical presses are not invincible in all the ways especially when they encountered with pressing tasks that request for heavy duty works. Besides the metal working industry, with the ongoing development towards light-weight parts for sports & exercises, aerospace, and automotive appliances and many other industries, servo hydraulic and hydraulic presses have become a crucial tool for the thermoplastic industries in the plastics and rubber sectors, and the servo hydraulic design makes those hydraulic presses competitive to ordinary mechanical presses.
In addition, there is the hydro-forming machine whose working mechanism is much like the mechanical press in several aspects. With these hydraulic pressing models in the waiting list, customers, users, buyers are now having more choices when they are considering the target goods, as they have more flexibility in the working condition.
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