Quality Control

Hardness is an essential characteristic of investment casting materials that determines their resistance to indentation. This physical property can be improved by heat treatment to enhance wear resistance according to the specifications of our customers.

Measuring the hardness value of an investment cast part involves determining the depth or area of the product using various test methods. To obtain accurate results, we perform hardness testing using modern automated testers on various areas of the same part.



At keming machinery, we have the latest equipment to test the hardness of investment castings using three standard methods: Brinell, Rockwell, and Vickers. For Brinell testing, we use a spherical penetrating body to press into the surface of the castings. For Rockwell, a bullet- or cone-shaped penetrating body is used, and for Vickers, we use a diamond pyramidal body. The impression made on the surface of the product by the penetrating bodies enables us to determine the hardness values. The results are expressed in HB, HRC, or the surface area deflection using the Vickers formula.

We 100% test hardness in investment castings if requested by our customers, ensuring the manufacturing process meets their specifications. If you need hardness testing services of investment castings, don't hesitate to contact us for high-quality outcomes. We are committed to providing superior services to our clients.

Magnetic Particle Inspection (MPI) is a non-destructive testing method used to detect surface and subsurface defects, including cracks, seams, inclusions, and porosity in investment castings. This method applies magnetic particles to the surface of the part, without damaging it in any way, to identify any invisible defects.

MPI is a quick and relatively uncomplicated process that detects defects with immediate results. It shows surface and near-surface discontinuities, which are the most significant ones as they concentrate stresses. The method can be adapted for site or workshop use and is less expensive than other sophisticated quality assurance methods.

At keming machinery, we recognize the importance of quality control and use MPI equipment to detect surface flaws in our castings. Our wet MPI method provides enhanced sensitivity, detecting discontinuities with a maximum depth of 1/4 inch. We carry out MPI testing on heat-treated or machined castings to ensure that there are no defects, and these products will not be delivered to our customers.



We also offer other non-destructive testing methods, including X-Ray Examination, Hardness Testing, Dye Penetrant Inspection, Leak Testing, to provide our customers with superior quality investment castings.

Contact us for your next investment casting project with NDT requirements, and we will provide you with professional and reliable services.

During the investment casting process, material testing is crucial in ensuring that the finished product meets the required specifications. At KEMING MACHINERY, we use a spectrometer to precisely test the chemical composition of the investment casting materials. This technology accurately tests each element of the metal, and we compare the results with the material standards. If the values are within the acceptable range, we consider the material qualified. This process is called chemical analysis.



To ensure the veracity of the material certification provided by the factory, we conduct a chemical analysis of a small piece before each batch of metal ingot is used. We also inspect the molten metal before pouring and conduct testing on the completed samples. The spectrometer analysis results are compiled into a material report that shows the standard material composition and the tested element values. This report is provided to our customers with their samples to ensure transparency. During mass production, each batch of investment castings passes chemical analysis to guarantee quality.



At KEMING MACHINERY, our spectrometer is connected to a computer that stores the reports on the network for easy access and traceability. We provide additional testing and inspection services, including dimensional, hardness, and magnetic particle testing, to ensure that our customers receive superior quality products. Proper archiving of this vital information ensures that the product's traceability is well-maintained.