Quality Control

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Quality Control

Quality control is a segment that plays a major role in the production processes. In 2014, we established advanced quality inspection standards and set up our quality control department, being able to inspect our products from eight aspects, including dimension, hardness, density, coercivity, magnetic saturation, metallographic, mechanical property, and product performance. In 2020, our 11 quality testing processes contributes to 99.1% qualification rate.

Dimension Inspection

There are 2 types of dimension inspection. For standard products, we use mechanical measuring tools like vernier caliper to measure. For customized products, we utilize a two-dimensional image detector to get product images and then use the measuring software for the measurements.

Hardness Inspection

We use a Rockwell hardness testing machine to inspect the hardness of our carbide tools.

Density Inspection

Following Archimedes’ principle, we use a multi-function balance, plus a thermometer and a beaker with a certain temperature, to measure the density.

Coercivity Inspection

Coercivity is one of the characteristics of ferromagnetic materials. The grain size of tungsten carbide can be determined by measuring the coercivity of tungsten carbide. We analyze the coercivity of tungsten carbide products by using the Coercive Force Meter. The specific method is to put tungsten carbide products into the instrument and then operate software to perform calibration measurements. Cobalt is the only ferromagnetic material in tungsten carbide products.

Magnetic Saturation Inspection

We use a magnetic saturation analyzer and a multi-functional balance to measure the magnetic saturation of Cobalt. The result shows not only the magnetic saturation strength of Cobalt, but also the carbon content of tungsten carbide. It is one of the key factors to measure the quality of tungsten carbide.

Metallographic Inspection

By using microscopy, metallographic inspection is applied to measure the physical structure and components of metals. Prior to the observation, sample preparation is crucial. We follow standard steps: cut a small specimen from the workpiece, mount the specimen in resin, grind it, polish it, and etch it, thus ensuring a correct result.

Mechanical Property Inspection

There are 5 main mechanical properties of tungsten carbide:

Flexural strength is a material property, defined as the stress in a material just before it yields in a flexure test. We use a three-point flexural test technique to measure.

Compressive strength is the capacity of a material or structure to withstand loads before failure. We measure compressive strength on a universal testing machine with specific test methods and conditions.

Tensile strength is the maximum stress that a material can withstand while being stretched before breaking. We use a tensometer to measure the tensile strength.

Impact toughness is the capability of the material to withstand a suddenly applied load. The impact toughness of a material can be determined with a Charpy or Izod test. We use a pendulum-testing machine to do the test.

Fatigue strength is the highest stress that a material can withstand for a given number of cycles without breaking. We mount a material sample into a fatigue tester or fatigue test machine to measure the fatigue strength.

Product Performance Inspection

We have two workshops to test the final performance of our carbide tools. One is to test our wood cutting tools, and the other is to test our metal cutting tools. Only in this way, can we get the data of the application of our carbide tools. We keep upgrading quality standards every year by adding inspection procedures.

Kone Carbide Tool Co., Ltd.
E-mail:   Click to show the Email
Tel:  +86-28-61716272
Mobile: +86 13648013796

Add:  No. 777 Haike Road Cross-Strait Industrial Park Wenjiang, Chengdu,610000,P.R.China
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