What are the requirements and testing methods for the quality of machine tool castings?

Today, Wuxi Hongming Casting Co., Ltd. will introduce machine tool castings to you. Machine tool castings, as one of the core parts of machine tools, have high quality requirements. Good casting quality can ensure the stability, accuracy and reliability of the machine tool. This paper will introduce the quality requirements of machine tool castings and the commonly used testing methods.

First, the quality requirements of machine castings

1. Basic requirements: The surface of machine tool castings should be smooth and smooth, without cracks, pores, slag inclusion and other defects.

2. Size requirements: The size of the machine tool castings should meet the design requirements, and the size deviation and geometric tolerance should be within the allowable range.

3. Material requirements: Machine castings should be made of appropriate materials with sufficient strength, toughness and wear resistance.

4. Machine tool casting surface hardness requirements: machine tool casting surface hardness should meet the design requirements to ensure its wear performance at work.

5. Internal organization requirements: The internal organization of machine tool castings should be uniform and dense, without inclusions and non-metallic inclusions, to ensure its comprehensive mechanical properties.

Second, the detection method of machine tool castings

1. Visual inspection: Through the naked eye to observe the surface of the casting for obvious defects and unqualified phenomena, such as cracks, pores, slag inclusion, etc.

2. Size detection: Size detection with measuring tools, including length, width, height, aperture and other dimensions measurement.

3. Acoustic detection: The use of appropriate acoustic instrumentation for acoustic detection of castings, through the propagation and reflection of sound waves to determine whether there are inclusions, cracks and other defects inside the castings.

4. Metallographic detection: Take the sample of the casting, after grinding, corrosion, dyeing and other treatment, use a metallographic microscope to observe the structure of the casting, detect whether there are inclusions, pores and other defects, and analyze the uniformity of its organization and grain size.

5. Hardness testing: Use a hardness tester to test the hardness of the casting to understand its hardness distribution to judge its strength and wear resistance.

6. Magnetic powder detection: applicable to the detection method of cast iron, the magnetic powder detector is used to spread magnetic powder on the surface of the casting, and the phenomenon of magnetic powder fusion is used to determine whether there are cracks and other defects in the interior of the casting.

7. Ultrasonic detection: The ultrasonic detector is used to carry out ultrasonic detection on the casting, and whether there are cracks, inclusions and other defects in the casting through the propagation and reflection of the ultrasonic wave.

In summary, the quality requirements of machine tool castings include basic requirements, size requirements, material requirements, surface hardness requirements and internal organization requirements. Common detection methods include visual inspection, size inspection, acoustic inspection, metallographic inspection, hardness detection, magnetic particle detection and ultrasonic detection. Through these quality requirements and testing methods, the quality of machine tool castings can be ensured to meet the design requirements, and the working stability, accuracy and reliability of the machine tool can be improved.