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Posted on Apr 18, 2021
The servo press technology today offers high forming loads for flexible applications in the stamping stroke and the capability of manufacturing more intricate products and achieving tight tolerance in product dimensions in different industries.
The servo press machine, as the name implies, is driven by the servo motor, which is used for deforming the metal parts under high pressure. As opposed to the structure of the standard mechanical press machine which includes the flywheel, clutch, and brake, the servo press machine provides full energy at various desired speeds, but not full capacity at each stage in the stroke.
When comparing the mechanical press machine and the popular solution today, the servo press machine, the operating speed, maximum force, and the position of the dies can all be more ideally controlled by the latter one. While the press speed maintains the same in the consistent production cycle of a mechanical press, both the rate of the output shaft and the position of the dies can be accurately controlled by the servo motor. The loads fed and increased slowly to build the power in a standard mechanical press, when reaching the maximum force near the center area of the bottom portion of dies, the mechanical press will then reverse to the opposite direction and restart the press cycle. In comparison, a servo press machine has an enclosed feedback loop that can automatically monitor and control the rate as well as the press loads.
The servo press technology today offers high forming loads for flexible applications in the stamping stroke and the capability of manufacturing more intricate products and achieving tight tolerance in product dimensions in different industries. On top of that, servo press machines only require easy maintenance, providing clean, reliable, quiet, and efficient metal deformation. As a result, the servo press machines are becoming popular for automobile production, conventional manufacturing, or high precision forming applications.
Servo press machines come in various types, such as servo motor is driven ball screw press, the servo motor is driven crank press and many more. The subtypes will be introduced later. The basic, universal work principle of these servo motor-driven press machines is to press and deform the metal parts under high pressure repeatedly at a predetermined speed. The shaping tools in the structure are the dies, which can be the upper dies or plates, or bottom ones. Under the control of the servo motor and the setting through the software, the servo press machine will either push the upper die onto the parts to shape the profile or drive the bottom die against the parts under high pressure. The pressure mentioned here is typically generated from hydraulic systems. Since the servo press machine can regulate the pressing speed and the press loads to optimize the production cycle, it is more versatile and reliable for modern machinists.
:: Read more: What Is a Small Servo Press?
Now we understand the features, advantages, and basic work principles of the servo press machines. Here is a detailed introduction of various types of servo motor-driven press machines.
Both standard hydraulic press machines and servo motor-driven presses are popular metal forming solutions. Hydraulic press machines rely on Pascal's law, transferring the consistent pressure on the confined fluid without any loss. As one piston creates a modest force on a small cross-section area, the consistent pressure in the system can generate a larger force in another piston (a large area). With the high performance of the servo motor control, the servo-hydraulic press is upgraded, achieving a greater slide rate in the forming process. The press machine is therefore ideal for complex manufacturing applications, such as forging, molding, punching, and other precision forming work.
As the name implies, the ball screws are employed in the servo ball screw press machine in order to reduce the friction in the forming process. Without a flywheel or clutch, the sliding rate can be altered in the servo-type screw press. Also, the full slide speed and maximum force can be applied at any desired position in a servo ball screw press, unlike the mechanical one. The type of servo ball screw press machine is better suited for applications that include rapid movements at the end of the cycle or longer process strokes like extrusion production. The load capacity of the ball screw and the reduction of the belt can significantly affect the max press load of a servo ball screw press machine. If increasing the number of servo motors and spindles, the servo press machines can be more powerful and efficient.
A servo crank press machine is a cost-efficient alternative for the servo ball screw press. The servo motor which provides consistent high torque density in a servo motor is a driven crank press that can be mounted to the drive shaft directly. These crank presses are very similar to those conventional mechanical presses, their main difference is that the servo crank press eliminates the flywheel and clutch. The servo-driven crank press is also ideal for high press load applications, employing two connecting rods to ensure effectiveness in such operations.
In a servo motor-driven linkage press machine, the linkage mechanism features a lower slide rate and higher load capacity. The servo motor is mounted near the bottom die center in this servo press machine type. By slowing down the sliding speed, the servo motor-driven linkage press is advantageous to raise the approach and return speed in the cycle. Another strong advantage of this servo press machine is the ability to handle a higher load throughout a long stroke.
In a servo motor-driven hybrid press, the knuckle joint and the linkage mechanism can enhance the power of the servo press when incorporated with the crankshaft. Also, the type can be combined and upgraded by employing the ball screw mechanisms.
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