Heavy Load Ball Screw Technical Features and Design Advantages

1. Typical Application Scenarios
Heavy-duty machine tools: such as CNC boring machines and gantry milling machines, requiring high cutting forces and long strokes.
Metallurgy and electric cylinders: Replacing hydraulic cylinders in steel smelting equipment (rated dynamic load 200 tons).

Lifting systems: such as screw jacks, with lifting forces reaching 25-1200KN. High load-bearing capacity
Heavy-duty ball screws significantly improve dynamic/static load capacity through optimized ball diameter, raceway design, and circulation structure (such as insert type and end cap type).

2. Long stroke and stability
For large equipment requirements, some products support ultra-long customization (such as a single 188-meter length) and employ hollow structures or ball worm gears to reduce inertial torque.

3. Optimized Circulation Structure
The insert-type external circulation system, due to its simple structure and good manufacturability, is the preferred choice for heavy-duty, high-speed systems; the end-cap type uses a metal reverser to reduce impact and improve durability.

Heavy Load Ball Screw Features

Focused on improvements of contact points of balls and thread grooves, ball diameter and circulation system for new type, FSVH. The rated dynamic load has been increased to as two times as that of conventional type, FSVC.

1. Long Life
Structure of the newly developed circulation system is designed to distribute the load uniformly to the load balls and it also increases the life of ballscrews.
On conventional circulation system, FSVC, the returning tube is inserted into the holes on ballnut perpendicularly which forms an advancing angle.
While ball moves into returning tube, it will hit tube end area and then move into returning tube. New circulation system, FSVH, ball will move into returning tube smoothly by tangent line as the same direction as lead angle. It can increase the life of circulation system structure.

2. High DN Value
With the newly developed circulation system, ballscrews can meet the demands of high speed running with high DN value.

3. Low Noise
To use tangential circulation system structure, it can eliminate the noise while balls run into the returning tube.

4. Various Specifi cations Combination
We can supply various ballscrews with diameter 50~100mm and lead 16mm to 25mm s(Please contact PMI for your specifi c design requirement)

5. Recommend mounting direction of heavy load ball screws
In order to support equal load distribution for shaft and nut, recommend mounting direction of ball screws allow fig.1 This mounting direction can avoided vibration as axial load uneven distribution for ball screws, therefore increase service life efficient.

fig.1 Recommend mounting direction of heavy load ballscrew

Fig. 2 Load distribution

6. Accuracy Grade and Axial Play
If you have any question about accuracy grade and axial play(e.g. axial play <0), please contact our sales for your specific design requirement.

Heavy Load Ballscrew Application

Plastic Injection Machines / Press and Forging Machines / Semi-conductor Equipments / General Machines

Heavy-duty machine tools: such as CNC boring machines and gantry milling machines, which need to withstand high cutting forces and long strokes.
Metallurgical and electric cylinders: Replacing hydraulic cylinders in steel smelting equipment (rated dynamic load 200 tons).
Lifting systems: such as screw jacks, with lifting forces ranging from 25-1200 kN.