1. The raw material of the ball screw is drawn through the mold to the required middle diameter size, and the surface hardness (0.5 mm deep) is reached (18 degrees -21 degrees) by the second cold drawing.
2. The precision level of the lead screw must reach: 3-4.
3. The raw material of the screw cold rolling process is straightened and rolled, and the surface hardness (0.5 mm deep) reaches 22 degrees.
4. The lead screw is treated with hard chrome, polished and straightened before leaving the factory.
The lead screw is a thin and long flexible shaft, and its aspect ratio is often very large, generally around 20-50, and its rigidity is very poor. In addition, its structure and shape are relatively complex, with highly demanding threaded surfaces, as well as steps and grooves. Therefore, the large lead screw is prone to deformation during the machining process. This is a major contradiction that affects accuracy in screw machining. Main technical requirements:
1. Dimensional accuracy The journal is the main surface of shaft parts, which affects the rotation accuracy and working state of the shaft. The diameter accuracy of the journal is usually IT6-9 according to its use requirements, and the precision journal can reach IT5.
2. Geometric shape accuracy The geometric shape accuracy (roundness, cylindricity) of the journal should generally be limited to the range of the diameter tolerance point. When the upper silver screw has high requirements for geometric accuracy, the allowable tolerance can be separately specified on the part drawing. 3. Position accuracy mainly refers to the coaxiality of the matching journal of the assembly transmission part relative to the supporting journal of the assembly bearing, which is usually expressed by the radial runout of the supporting journal to the supporting journal; according to the requirements of use, The high precision axis is specified as 0.001～0.005mm, and the general precision axis is 0.01～0.03mm.
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