A defect inspection tool for the outer edge of a turbocharger impeller blade and an inspection method thereof

Abstract

The invention relates to an inspection tool for the outer edge defect of a turbocharger impeller blade and an inspection method thereof. The inspection tool includes a main body of the inspection tool, a mounting hole is opened in the middle of the main body of the inspection tool, and a first measuring claw is arranged on the bottom side of the main body of the inspection tool. , The second measuring claw and the third measuring claw, the bottom end of the first measuring claw has a Z1 reference surface, the side is provided with the first measuring claw profile and the first measuring claw line, and the bottom end of the second measuring claw has a Z2 reference There is a second measuring claw profile on the side, as well as a second measuring claw line, the bottom end of the third measuring claw is provided with a Z3 reference plane, the side has a third measuring claw profile, and the outside is also provided with a third measuring claw According to the present invention, three measuring claws are arranged on the outside of the main body of the inspection tool. Accurate and intuitive identification of defects facilitates the inspection process for outer edge defects of turbocharger impeller casting blades.

Description

technical field [0001] The invention relates to a turbocharger impeller blade outer edge defect inspection tool and an inspection method thereof, belonging to the technical field of turbocharger impeller blade inspection tools. Background technique [0002] The outer edge of the turbocharger impeller blade manufactured by the casting process has defects such as lack of meat, pinholes, pores, and bumps. Usually, there is a machining allowance of 1 to 3 mm on the blade edge. If the defect is within the machining allowance range, If the defect can be removed by machining, the defect is allowed; if the defect is larger than the machining allowance, the defect cannot be removed by machining, then the defect cannot be passed. The commonly used detection method is mainly calipers to check whether the defect is within the machining allowance range; the biggest disadvantage of this method is that for larger defects, especially when the defect is close to or even exceeds the blade mac...

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Problems solved by technology

[0002] The outer edge of the turbocharger impeller blade manufactured by the casting process has defects such as lack of flesh, pinholes, pores, and bumps. Usually, there is a machining allowance of 1 to 3 mm on the edge of the blade. If the defect is within the range of machining allowance, If the defect can be removed by machining, the defect is allowed; if the defect is larger than the machining allowance, and the defect cannot be removed by machining, the defect cannot pass

The commonly used detection method is mainly a caliper to check whether the defect is within the range of machining allowance; the biggest disadvantage of this method is that for larger defects, especially when the defect is close to or even exceeds the machining allowance of the blade, it cannot be accurately detected. Judging whether the defect is out of tolerance

[0003] First of all, the caliper inspection is based on the edge of the blade for measurement and evaluation. However, due to the large fluctuations in the size of the casting, there is a large circular runout at the edge of the blade relative to the machining benchmark of the impeller, which will cause the size of the apparent defect to be smaller than the machining allowance when the caliper is measured. However, the defect of the actual impeller cannot be removed after machining; secondly, the jaws of the caliper cannot penetrate into the defect to accurately measure the size of the defect, and can only be roughly estimated by sticking to the defect, with poor accuracy and poor operability. Therefore, it is necessary to design a method based on The inspection method for turbocharger impeller machining benchmark and convenient and intuitive inspection for blade edge defects

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