Spacer for Ultra Precision Shimless Line

Marks
Detailed Marking
Easy Tool Selection

Marking Thickness in the Dirt Groove for Permanent Retention

Each customer's budget and usage conditions vary greatly. This determines the choice of material and production process for slitting tools. Alloy tool steel has high strength and wear resistance, and stainless steel has good corrosion resistance.
 

Flatness and Parallelism
Sufficiently high flatness and parallelism are necessary conditions to ensure that the shear clearance between the upper and lower slitter blades of the slitting machine is always consistent during dynamic operation. Correct clearance is at the heart of ensuring precision cutting. If the surfaces of circular slitter knives are not flat, or the two sides of the blade are not parallel, the gap between the upper and lower blades is always changing. In addition, the reaction force generated by the extrusion of the strip during slitting also causes the gap to change continuously. This will make it impossible to get burr-free strips.

Thickness Tolerance
The thickness tolerance of the blade is mainly to ensure the cutting accuracy of the width of the metal strip and prevent the cumulative error in the knife assembly. If a blade with a thickness tolerance of 1~2 μm or even 0.5 μm cannot be provided, the cumulative error when multiple shearing knives are assembled is unavoidable.

"+", "0", "-" Marks - Slitter Tool Accuracy Reclassification
The re-grouping of precision slitting tools can greatly improve the precision of blade assembling and eliminate accumulated errors. Since it is impossible for a manufacturer to produce spacers of absolutely the same thickness, there is always some allowable error. And the slitting machine is composed of many basic cutting units, and each unit is composed of many knives, bonded stripper rings and spacers. Even the most precise spacers that fully meet the requirements of the drawings will have accumulated errors after tens or hundreds of spacers are stacked together. In order to completely eliminate the accumulated error, the user must group the slitting tools so as to improve the accuracy of the blade assembly. A slitting tools with poor precision cannot use software because no one knows its actual size value. The grouping is to divide all blades and rubber bonded stripper rings, spacers with a tolerance within +/- 1 μm into three groups respectively Marked with "-", "0", "+" marks. When assembling tools, use the principle of "+" and "-" to offset, and put tools (slitter knives, bonded stripper rings and spacers) with zero total error together as much as possible, thereby reducing the gap error of each unit and the total accumulated error.