We Buy & Sell Screw Presses
Authorized Dealer of Used Forging Machinery
TrueForge specializes in the buying and selling of screw presses. A screw press is an energy-limited machine that takes the rotational energy from a flywheel and turns it into the linear motion of a ram. Once the forging is complete, the ram movement ceases.
Screw Presses are mainly used to forge a variety of metals and alloys, which includes steel, titanium, aluminum, and brass. Making it a popular forging machine for those in the aerospace and medical industry. With this machinery, many different shapes can be forged. From orthopedic implants to hand tools, use your screw press to forge new parts. In the hands of a professional, precision-forged and net-shaped parts are also possible using screw presses.
Contact TrueForge Today
Check out our full selection of screw presses for sale. We are constantly buying and selling forging machinery, so our inventory is always in flux. Buy we pride ourselves on selling these screw presses at fair and reasonable prices. Please email us at sales@trueforge.com or give us a call at 516-825-7040 if you have any further questions.
Get Quote
Different Types of Screw Presses Available
In general, screw presses are versatile pieces of forging equipment. They are great for precision and net-shaped forgings. When in operation, they practice as energy-constrained hammers and operate at speeds greater than hydraulic presses. These sizes of these presses range from very small to tonnages that are normally associated with the largest hydraulic presses. There are a number of different drive mechanisms you can use to rotate the flywheel and the screw that converts the rotational energy in the system into the linear motion it needs to move the dies together in order to forge the metals.
When you search for screw presses, you will notice there are different types available in the market. The differences are primarily in how the energy for the operation is transmitted. The main types are friction screw presses, clutch-operated screw presses, and electronically driven presses. You may also see a few hydraulically driven screw presses, too. Let's learn a little more about some of these different types of screw presses.
Friction Screw Presses
Friction screw presses are straightforward machines with only a few operator variables. A friction press is perfect for the forging of thin parts. However, they require regular replacement of the friction belts and are quite unsuitable for large tonnages. A friction screw press also has a longer cycle time relative to other types of screw presses and the operator has little control over the amount of energy in the blow.
Atmospheric conditions, like humidity, can influence the characteristics of the blow. The side wheels are permanently rotated via an electric motor and a drive belt and are moved from left to right to impart rotation to the horizontal flywheel in either direction to lower or raise the ram.
Clutch-Operated Screw Presses
On a clutch-operated screw press, the flywheel is continuously running in the same direction. And there is a clutch built into the flywheel that connects to the screw of the press. When the clutch is engaged, the rotation is transmitted to the screw. When the bottom of the stroke is reached, the clutch disengages and a hydraulic motor reverses the direction of the screw. Thus raising the ram back to the top stroke position.
Due to the clutch, the setting of force and stroke varies. A clutch-operated screw press has high amounts of forming energy available. But the flywheel speed has no influence on the forging force. These presses will get the full force and energy capability after about 30% of the stroke. These presses are also capable of running at full ram speed after only 10% of the stroke.
Overall, clutch-operated screw presses are more expensive than your average friction screw press. And are also more expensive to run. They also require a higher level of knowledge by the staff in order to operate properly. When you buy from us, you will get the best price available for used machinery.
Electrically Driven Screw Presses
When it comes to electrically driven screw presses, there are 2 basic types. The first type is where the electric drive motor or motors are arranged around the flywheel, which gets directly attached to the screw. The motors in theses presses directly impart rotational energy into the flywheel. When the bottom of the stroke is reached, the motors reverse rotation of the flywheel and raise the ram to its top of stroke position.
Then we come to the second type of screw. This is when the press is directly driven by the electrical motor, so the motor effectively acts as the flywheel. Here, the motor first drives the screw in one direction and then at the bottom of stroke it will stop and reverses the direction of the rotation to raise the arm. The direct-drive systems are designed for precision forgings, which require low to medium forging energy. In general, these types of presses are built with an hydraulic overload protection. This gives them better energy utilization over many different types of forging forces. As well as having a very precise energy repeatability, which makes them a popular industrial option for those looking for screw presses.