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Ball Screw

Providing you the best range of hiwin rolled ball screw and hiwin ground ball screw with effective & timely delivery.
Hiwin Rolled Ball Screw
  • Hiwin Rolled Ball Screw
  • Hiwin Rolled Ball Screw

Hiwin Rolled Ball Screw

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Product Details:
Minimum Order Quantity1 Set
FinishingRolled and Ground
Quantity Per Pack1
MaterialStainless Steel
BrandHIWIN, THK, PMI
Size12 mm, 14 mm, 16 mm, 20mm, 25mm, 32mm, 40mm, 50mm, 63mm Diameter
Packaging TypeBox Packing

Rolled ball screw threads are created by pushing each uncut bar stock blank through rotating tool dies in a single operation.  The driving principle behind this process is a cold work deformation process where the blank material is literally shaped by rolling tooling dies which are designed to form both the internal and external threads of the lead screw and ball nut.  Although the rolling dies come in a wide variety of shapes and sizes as required to roll various thread sizes, the deformation principle is the same for both internal and external threads.  The rolling process is highly efficient because no material is physically removed from the cut blanks, as would be the case in any cutting or grinding process.  The process is widely used throughout the industry because it can be easily automated to achieve high rates of production.

Conversely, ground screw threads are fabricated through an abrasion process that typically occurs in a horizontal setup where the material blanks rotate on their long axis between two machining centers while extremely hard abrasive cutters that are designed to cut a few threads at a time, carve out the threads from the cut blanks.  A similar process is employed for both internal and external thread cutting of the lead screw and ball nut.   This progressive abrasive machining process requires the material blanks to be cut to final length before grinding.  Varying cutter sizes and styles are used to grind the internal vs external threads, but the conceptual process is the same.

 

Strengths and Limitations

Rolled screw threads generally possess more strength than ground screw threads due to the significant material strengthening that is achieved as a result of the large plastic deformation induced in the material to create the threads during the rolling process.  Rolled threads are the more cost effective option because they can be quickly fabricated in automated rolling machine setups.  Because the rolling process is a considered to be a “one shot” process, any fabrication errors in the rolled screw threads are nearly impossible to fix.  Rolled threads also tend to possess rougher surface finishes than ground threads, and this can be especially problematic because rough surface threads can lead to reduced mechanical efficiency due to the higher rolling friction encountered in the rolling ball bearings.  A rough surface finish can also contribute to an overall decrease in the wear resistance of the ball screw system.

Finally, rolled ball screw systems are especially vulnerable to dimensional distortions as a result of die tooling wear. These sources of error can lead to a ball/nut system that possesses excessive backlash, which occurs due to a mismatch between the bearing diameter and screw shaft threads, and it also sharply decreases the positional accuracy that can be achieved.

Conversely, the thread grinding process is inherently more time intensive than the rolling process, partly because of the specialized grinding tools required for the cutting operation.  This translates into a significantly higher “off the shelf” price tag for ground ball screws compared to rolled ball screws.  However, there is a significant benefit achieved for the higher cost process because the ground threads can be held to tighter tolerances in relation to the centerline of the material blank because each thread is ground one at a time.  For these reasons, ground ball screws are almost exclusively employed in applications where high degrees of precision and repeatability are required.

 

Additional Information:

  • Item Code: RBSGBS
  • Production Capacity: 20
  • Delivery Time: Immediate
  • Packaging Details: Box


Additional Information:

  • Delivery Time: 1 Week
  • Packaging Details: Box Packing
Get Best QuoteRequest A Callback
Hiwin Ground Ball Screw

Hiwin Ground Ball Screw

Get Latest Price

Product Details:
Minimum Order Quantity1 Set
MaterialStainless Steel
BrandHIWIN, THK, PMI
Packaging TypeBox Packing
Quantity Per Pack1
Size12 mm, 14 mm, 16 mm, 20mm, 25mm, 32mm, 40mm, 50mm, 63mm Diameter
Hiwin precision ballscrews are made through a grinding process of the screw spindle. Precision ground ballscrews provide high positioning accuracy and repeatability, smooth movement and long service life. These highly efficient ballscrews are a perfect solution for a variety of applications.

Additional Information:

  • Production Capacity: 20
  • Delivery Time: Immediate
  • Packaging Details: Box


Additional Information:

  • Delivery Time: 1 Week
  • Packaging Details: Box Packing
Get Best QuoteRequest A Callback

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