The difference between two processes of ball screw

There are two main processing methods for grinding and rolling ball screws. Users who have understood the screw products should be clearer. The processed products will also have certain differences depending on the process and processing methods. The following content, from several In this respect, we will introduce the difference between ground ball screw and rolled ball screw in detail:

1. Different processing methods

Rolling is to first cut grooves with a certain depth in the polished rod material, the groove pitch is equal to the wire pitch you want to process, and then roll it out with a thread rolling machine similar to processing threads. The accuracy level is medium and low, suitable for ordinary It can be used on equipment that does not require high precision.

Grinding is based on pressing and rolling with a special cylindrical grinder to perform precision machining of the shape and size of the arc groove, but the cut groove is at the bottom of the arc groove, and the accuracy level is above the middle level. It is suitable for precision requirements such as CNC machine tools. On higher devices.

The rolling ball screw is formed by extrusion, and the grinding grade, as the name suggests, is processed by grinding. Transformation is not the same as the grinding process, and there will be traces of the process when it comes out naturally.

2. The difference in craftsmanship

The processing technology of foreign rolled ball screws (usually called "rolled ball screws" in Europe and America) is relatively simple. Most of them are made by batch rolling and then made into ball screws of different lengths according to needs. The pressing process of the ball screw thread is mostly the same at home and abroad, and the processing technology of the single rolling ball screw in the later period is slightly different.

In Europe and the United States, most of the shaft end hard turning processing technology is adopted, which is simple and efficient. At present, the traditional technology of turning the bearing seat after the shaft end annealing is still used in China. The pros and , It goes without saying.

Large margin processing hardened steel ball screw processing technology is more flexible, easy to arrange production, replacing the annealing process and secondary quenching processing technology; in addition to the exquisite appearance of the processed product, the shaft end part is also reduced due to multiple times Defects of unstable performance of the ball screw caused by heat treatment.

3. The difference in appearance details

Rolled ball screws generally have a smooth and shiny surface and high reflectivity under light conditions.

The grinding level can see the grinding marks of the grinding wheel on the surface carefully. In terms of appearance, the raceway groove of the converted ball screw is smooth and shallower than that of the ground ball screw; there is generally a small groove at the top of the bulge between the raceway groove of the converted ball screw and the raceway groove.

4. Different accuracy

The precision of ground ball screw is generally below C7 (±50/300MM)

The precision of the rolling ball screw is above C7 (±50/300MM)

The domestic ball screw is recommended to use grinding C3 (0.0008)

Taiwan-made ball screw is recommended to use grinding C3/C5 (0.0008/0.0018)

It is recommended to use grinding C3/C5/C for ball screws made in Europe, America and Japan