Precision Measurement Methods for Slitting Tools

Precision Measurement Methods for Slitting Tools

Over extended periods of use, slitting tools often develop issues such as thickness deviations or inconsistent parallelism. These variations typically result in uneven sheet cutting, burred edges, and even accelerated tool wear. Therefore, enterprises must conduct regular precision inspections of tools to ensure their proper functioning.

For most small and medium-sized metal shearing enterprises, commercially available measurement equipment like precision flatness gauges is costly and complex to operate, making it unsuitable for routine inspections. While traditional methods using dial indicators on marble platforms are low-cost, they present two main issues: first, operator technique and probe contact conditions affect final results; second, the marble surface itself introduces inherent errors.

To address this, we have developed a high-precision, user-friendly inspection solution for slitting shears. Its principle, simply put, relies on the fact that three non-collinear points define a unique circle. Below, we detail the inspection process.

Procedure:

(1) Preparation

First, gather the dial indicator, standard gauge blocks, and three high-hardness steel balls. Next, clean oil, metal shavings, or dust from the tool surface and steel balls. Calibrate the dial indicator to ensure measurement accuracy. Finally, rest the tool on the three steel balls.

(2) Measurement Process

1. Flatness: Measure the height difference between any three points on the tool surface using the dial indicator. Record the height difference. If depressions or similar issues are found, mark them and determine if regrinding is required later.

2. Thickness: Measure tool thickness at multiple positions using the dial indicator. Compare against standard gauge blocks and record data to assess thickness uniformity.

3. Parallelism: Measure height differences between cutting edges and support planes. Determine the difference between highest and lowest points. If the difference is excessive, consider adjusting the tool installation angle or performing regrinding. For multi-tool sets, measure each tool individually whenever possible to ensure consistent edge installation.

(3) Data Analysis

Classify results based on measurements into three categories: requiring regrinding, adjustment, or scrapping. Additionally, analyze cumulative data to assess tool lifespan and optimize future production processes.

This inspection method for slitting shears offers broad applicability and can be rapidly performed on-site. Its simplicity and ease of implementation make it a widely adopted routine inspection technique among numerous small and medium-sized enterprises.