Method For Grinding The Helix Angle Of Ball Screw And Ball Nut Thread Raceway

Grinding the screw ball screw angle of ball screw and ball screw needs to be considered from the aspects of equipment precision control, process parameter optimization, real-time monitoring and adjustment. Core approaches, key process points and problem-solving methods are described below.
1.Core approach: collaborative control of equipment and processes
Selection of high-precision equipment
It is best to use a CNC thread grinder. The linkage accuracy between the C-axis (rotational axis) and the X-axis the X-axis (axial movement) must be ±0.001mm to ensure that the angle (the helix angle) between the helix and the axis conforms to the design requirements.
Grinding wheel selection and finishing
Grinding wheel type: according to the material hardness selection. Diamond wheels, for example, are suitable for carbide screws, while CBN (cubic boron nitride) grinding wheel can be used for ordinary steel parts.
Grinding wheel: diamond roller is used regularly to maintain the grinding wheel's topography, maintain the blade sharp, and prevent helix deviation caused by abrasion.
Case study: a car production line improved helix angle consistency by 40% by daily grinding wheel dressing. Optimization of coolants and lubricants
a water-based coolant (containing rust repellent) is used at a controlled flow rate of 15-20 L/min to ensure temperature stability in the grinding area and minimize the impact of thermal deformation on the helix angle.

II. Process Highlights: Accurate control at all stages
Rough Grinding Phase: stock distribution and Topography Pre-shaping
Reserve 0.05-0.10 mm of fine grinding residue to prevent excessive cutting force from workpiece deformation during rough grinding.
The grinding length of each segment is controlled at 50-100mm by a segmented feed method to minimize the effect of vibration on helix.
Fine Grinding Phase: Dynamic Parameter Adjustment
Feed Speed: Adjust according to real-time helix angle measurements. If the deviation is + 0.05, the feed rate is reduced to 80% of the original value.
Wheel speed: RPM increases to 40 m/s for hard materials (e.g. stainless steel) and decreases to 25 m/s for soft materials (e.g. aluminum alloy).
Online Measurement and compensation
Use a laser interferometer or contact probe to measure the helix angle after each helix turn. This data is fed back into the CNC system to automatically correct feed speed.