Massive Selection for Superhard Diamond Grinding Wheel CBN Grinding Wheel for Cutting Tool

Roundness gauges, surface analyzers and helix test benches – instruments for measuring roundness, cylindricity, surface finish and shaft seals with a helix angle have been around for a long time. The Hommel-Etamic Roundscan system combines all these measurements into one powerful automated control system for metrology laboratories and production shops.
After using the sapphire ball head to measure the roundness and cylindricity of the neck, the equipment automatically indexes the diamond tip, measures the neck diameter and gear face surface finish, and finally measures the neck advance angle. .
The lead angle is a periodic pattern in both the axial and circumferential directions. The characterization of axial structural roughness requires the use of high resolution measurement systems. Circular structural roughness can be characterized using a much coarser system since the lead angle frequency is typically in the range of 0 to 180 waves per 360° revolution. This makes it possible to measure the lead angle with a certain number of parallel roughness marks in the axial direction. Partial clamping of the workpiece can affect this type of measurement, which can be eliminated using special equipment or mathematical algorithms.
Lead angle problems arise in turning and grinding, when the feed motion inevitably leads to the formation of a single thread-like surface structure, the gradient in terms of which is determined by the rotary feed. When dressing a wheel, the dressing feed rate can form a spiral on the surface of the grinding wheel, which is then transferred to the surface of the workpiece during the actual grinding process (depending on the ratio of rotational speeds). This requires using the entire circumference of the workpiece to determine the lead angle structure (torsion measurement). Since these helical formations (advance angle) formed during production can lead to unacceptable lubricant consumption and failure of the entire assembly, it becomes even more important to develop a standardized method that can be realistically measured.
Measuring the advance angle of a shaft seal is a complex and time-consuming process, requiring either the use of an expensive microscope to measure the advance angle or the use of a separate test rig to test the string. The HE Roundscan also measures and calculates the lead angle of the sealing surface.
Hommel-Etamic, as one of the co-sponsors of the earlier 1st generation standard and the newer 2nd generation standard (MBN 31007-07), has developed two measurement procedures designed to provide the best possible measurement results.
Twist and TwistLive have been optimized to perform realistic lead angle measurements on parts made by grinding or turning. The torsional pitch measurement consisted of obtaining 72 individual roughness traces separated by 5 degrees, each track having a length of exactly 2 mm with a sampling step of 0.5 µm. This measurement process allows you to actually measure the lead angle, pitch and lead depth around the entire circumference of the part. This is a time-consuming process, but it is possible not only to actually measure each parameter, but also to calculate the volumetric area from the total surface area. Real-time slewing lead measurements take just about 10 individual roughness traces, each exactly 2 mm long, sampled at 0.5 micron distance, and then extrapolate (predict) the lead angle between each trace, greatly reducing measurement time. This unique feature reduces lead measurement time from approximately 30 minutes to 2 minutes.
To accurately measure the helix angle of dynamic sealing surfaces, Twist and TwistLive measurements allow the manufacturer to better control and potentially eliminate fluid leakage at dynamic stress points. Don’t measure the lead angle, measure it.
Programming the Hommel-Etamic EVOVIS evaluation software is quick and easy and includes automatic part type recognition. The EVOVIS software uses sophisticated technology and safety features to avoid collisions. The measured evaluation results can be exported for further processing of the verified parameters.
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Post time: Jan-10-2023

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