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Home> Company News> What is the difference between a ground and a rolled ball screw?

What is the difference between a ground and a rolled ball screw?

2024,11,22
In ball screw manufacturing, grinding and rolling are the two main processing techniques.
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I. Definitions

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?1. Rolled Screw
A rotary forming process for making screw shafts by rolling, used to produce threaded rods, also known as thread rolling.
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2. Ground Ball Screw

Precision machining of the circular arc groove's shape and size using a cylindrical grinder after rolling.
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ground precision ball screw set

II. Processing Methods

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1. Rolling Process

In China, the traditional process involves annealing the shaft end before turning the bearing seat. Compared to foreign hard turning, it has drawbacks. Recently, China has been exploring a new process for quenched steel ball screws with large allowances. It's more flexible, skips annealing and secondary quenching, and yields products with good appearance and stable shaft end performance. It is now used in some domestic high-quality-demand enterprises.
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2. Grinding Process

Ground ball screws start with rolling to form a basic shape, then use a cylindrical grinder for precise machining of the circular arc groove in terms of shape, size, etc. The cut groove is at the bottom of the circular arc groove, and it suits high-precision equipment like CNC machine tools.
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III. Appearance Details

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1. Rolled Ball Screw

Its surface is smooth and shiny with high reflectivity. The raceway groove is relatively smooth and shallow, and there's a small groove on the ridge between raceway grooves.

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2. Ground Ball Screw

Grinding wheel marks are visible on its surface. The raceway groove is more regular than that of the rolled one, and the surface is smooth and flat except for the concave and convex parts.?
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IV. Precision

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The precision of ground ball screws is generally below C7 (±50/300MM)
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The precision of Rolled Ball Screws is above C7 (±50/300MM)
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For domestic ball screws, it is recommended to use ground C3 (0.008)
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For Taiwan-made ball screws, it is recommended to use ground C3/C5 (0.008/0.018)
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V. Applications

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1. Rolled Screws

They have lower precision, leading to shorter service life and lower transmission efficiency, but are cheaper. For example, in simple material handling equipment, they can handle basic tasks and cut equipment costs.
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rolled ball screw assemblies

2. Ground Screws

They have high precision, long service life, and high efficiency, but are costly. In high-precision CNC machining equipment, they ensure tool precision movement and better machining quality, essential for high-end product manufacturing.?
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VI. Selection Key Points

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1. For high-precision equipment like precision measuring instruments and high-end CNC machine tools, ground screws are better.
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2. For equipment with lower precision needs like some auxiliary transmission in ordinary production lines or simple material transfer equipment, rolled screws can be chosen to control cost while meeting basic functions.
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Hojama provides both ground and rolled ball screws, the ground ball screws include Miniature Ball Screws, Precision Ball Screws, and bi-direction ball screws. And rolled ball screws include 20mm Diameter Rolled Ball Screw, 25mm Diameter Rolled Ball Screw, 32mm Diameter Rolled Ball Screw, 40mm Diameter Rolled Ball Screw, 50mm Diameter Rolled Ball Screw, 63mm Diameter Rolled Ball Screw, 80mm Diameter Rolled Ball Screw.
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precision ground ballscrews
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Contact Us

Author:

Mr. Augus

E-mail:

augus@hojama-tech.com

Phone/WhatsApp:

What is the difference between a lead screw and a ball screw?

September 27, 2024

HOJAMA Highlighted Miniature Ball Screws at Xiamen
HOJAMA Highlighted Miniature Ball Screws at Xiamen

October 18, 2024

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