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Conventional mechanical power press has long been equipped with crankshafts or eccentric gear drives in which the sliding speed is symmetrical between the bottom and top halves of the press stroke. With this simple system, stamping is limited to those operations in which the crank movement and sliding speed can produce an acceptable part. However, due to the excessive sliding speed of the working part through the stamping stroke, the need for improved metal plastic flow during stamping operations cannot usually be achieved by using a standard crank motion press. To meet the need for improved metal fluidity, modern press manufacturers have designed drive modifications that alter the sliding motion of the press as it passes through the working portion of the stroke.
1. Drawing Link Press
The drawing link press is the movement that usually comes to mind when discussing link movement for link press. Drawing. Link press motion is used to perform deep draw operations and to stretch and form metal without tearing by reducing the sliding speed of the working part through the punch stroke Another characteristic of the link press design is to maintain a constant sliding speed while performing the traction operation. This constant speed improves part quality and strength by reducing side wall thinning. This constant velocity is represented by a straight lineThe part of the velocity curve near the bottom of the punch stroke. It must be understood that because the slider approaches the bottom or bottom of the stroke for a short time, the link press rod movement is not conducive to blanking, embossing, flow-controlled forming, or progressive die operation.
2. Progressive Die Link Press
As the name implies, this modified sliding motion aims to enhance the performance of progressive die operation. Drag link press or slider link press are also terms that might be applied to this movement. Progressive die link presses are used to reduce the sliding speed of the working part through the punch stroke by 25% to 40%. When pressure is applied to metal, it turns into plastic and can be shaped into almost any desired shape. This plasticity is enhanced by extending the time the pressure is maintained on the metal. The benefits of this increased plasticity include, but are not limited to:
- Reduce spring back molding operations
- Imprint station of the desired shape can be obtained without re-hammering the part.
- Perform piercing and extrusion operations to reduce material cracking.
- In-mold tapping can be performed at higher strokes per minute.
- Can produce shallow drawing at very high strokes per minute.
In order to recover the lost time due to reduced sliding speed at the lower part of the punch stroke, the speed is increased through the upper part of the stroke so that the stroke per minute is not sacrificed. In many cases, progressive die link press will enable the punch user to increase the speed of the punch machine by 25% or more because the forming operation is performed at slower sliding speeds. An increase in speed can mean the difference between making or losing money.
3. Vertical Link Press
Vertical link press motion is an improved sliding motion that more than doubles the time it takes for the punch to engage the formed metal. This movement is most commonly used in coiled feed progressive die heads, in which flow-controlled forming is used to produce mesh parts. This flow-controlled forming process forces the metal to flow plastically under the pressure provided by the press and produces parts that redistribute the metal to the desired area.
4. Knuckle loint Link Press
Although knuckle link press movement is not a linkage movement, it is an improved sliding movement. This actuator is designed for use in presses that require very high metal flow rates to produce finished parts. The knuckle design provides unlimited pressure at the bottom of the press stroke and acually creates a stay here. Knit joint actuators are primarily used in heavy stamping or cold forging operations, thereby eliminating the secondary machining ofi networked or near-networked parts.
These 4 types of link presses are widely used in the industry. We supply the best and competitive link press, forging.press, and cutting press, please contact us for more information.
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