Sawing tool quality appraisal

sawing tool is based on the core principles of carbide composite strengthening and edge geometry optimization. By optimizing the base material, coating process and heat treatment parameters, it achieves the synergy of high wear resistance and cutting efficiency. It is widely used in metal processing, wood cutting, aerospace component forming and other fields. In automobile manufacturing, it is used for precision sawing of high-silicon aluminum alloys in engine blocks; in the field of heavy industry equipment, it is used to achieve continuous segmentation of high-strength steel plates; in the aerospace industry, it is used to meet the low-stress processing requirements of titanium alloy components. Compared with ordinary cutting tools, sawing tools have the characteristics of strong edge retention, excellent chipping resistance, and high coating adhesion. They are core consumables for modern high-efficiency precision machining.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide sawing tool quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for sawing tool quality appraisal.

With the popularization of high-speed cutting technology, there has been a significant increase in sawing tool quality disputes. The judicial dispute focuses on:

1. Disputes over performance indicators: whether the actual cutting life reaches the standard and whether the machined surface roughness exceeds the standard;

2. Material defects: insufficient cobalt content in the cemented carbide matrix and thick diamond coating Uneven degree;

3. Process problems: Vacuum quenching temperature deviation leads to excessive residual austenite and error in edge passivation radius control;

4. Contract performance dispute: The material or geometric parameters of the delivered tool do not match the technical agreement.

1. Macroscopic inspection:

Inspect the overall shape, size, sawtooth shape and number of circular saw blades and other appearance features to find out whether there are defects such as missing teeth, cracks, deformation, etc.

2. Microscopic inspection:

Use a microscope to observe the microstructure of the tooth surface of the circular saw blade and analyze its structure, hardness, wear, etc.

3. Performance test:

The applicant, an aviation parts factory, signed a "Titanium Alloy Special Saw Blade Purchase Contract" with a tool manufacturer, the respondent, stipulating that the tool life should be ≥ 200 hours. In actual processing, the saw blade suffered a large area of cutting edge chipping within 80 hours, resulting in a scrap rate of over 30% for titanium alloy forgings. The manufacturer argued that the pH value of the coolant was out of control, causing chemical corrosion.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "saw cutting tools", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The cobalt content of the carbide matrix of the tool involved is only 4.2% (contract requirement is 6-8%), resulting in insufficient toughness; the diamond coating thickness fluctuates to ±1.2μm (standard ≤±0.5μm), and the local bonding force is only 45N; the edge passivation radius is 0.1mm (agreement ≤0.03mm), and the stress concentration factor increases by 3 times.

The appraisal conclusion determined that material composition deviation and process control were the main causes of failure, and the influence of coolant was only a secondary factor.

Sawing tool quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standard, power of attorney, etc.)

4. Identification method