Detection method for skin clamping of cylindrical aluminum alloy die casting
Through ultrasonic flaw detection technology combined with water-immersed probes and prototypical wedges, the problem that the existing technology cannot detect the defects of the aluminum alloy die-casting clips is solved, and efficient and accurate detection results are achieved.
Patent Information
- Application Number
- CN202411891906.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-18
AI Technical Summary
Existing detection methods cannot effectively detect the skin defects in aluminum alloy die castings, especially when the defects do not penetrate the entire wall thickness of the castings.
Ultrasonic flaw detection technology is adopted to achieve efficient detection of the inner hole wall of cylindrical aluminum alloy die castings through the cooperation of the water-immersed probe and the prototypical wedge.
It can accurately and efficiently detect the skin defects in aluminum alloy die castings, with a detection rate of 100%, meeting the detection requirements.
Smart Images
Figure CN119643698A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of nondestructive flaw detection of aluminum alloy die castings, in particular to a method for detecting skinning of cylindrical aluminum alloy die castings. Background Art
[0002] During the production process of aluminum alloy die-castings, aluminum alloy skin (hereinafter referred to as "skin") may appear. The skin defect may cause the casting to crack when subjected to external force. When the skin defect does not penetrate the entire wall thickness of the casting, existing detection methods such as X-ray flaw detection, CT flaw detection, and color penetrant flaw detection cannot detect the existence of the defect. Summary of the invention
[0003] The purpose of the present invention is to provide a method for detecting skin inclusions in cylindrical aluminum alloy die castings, which can accurately and efficiently detect the problem of skin inclusion defects in aluminum alloy die castings by using ultrasonic flaw detection, a non-destructive flaw detection technology.
[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for detecting skin inclusions of cylindrical aluminum alloy die castings, comprising an ultrasonic flaw detector, a water immersion probe, a water tank, a turntable, and a cylindrical aluminum alloy die casting, wherein the water tank is filled with water, and a turntable is placed at the bottom of the water tank, a cylindrical aluminum alloy die casting is placed on the turntable, an inner hole wall of the cylindrical aluminum alloy die casting is fitted with a profiling detection surface of a profiling wedge, an immersion probe is fixedly connected to the inner groove of the profiling wedge by a fixing screw, and the immersion probe is connected to the ultrasonic flaw detector through a wire harness; The steps of the cylindrical aluminum die casting skin detection method are as follows: First, place the cylindrical aluminum alloy die-casting to be tested on the turntable at the bottom of the water tank, and fill the water tank with water. The water level should be higher than the upper surface of the cylindrical aluminum alloy die-casting to be tested. Then, the ultrasonic flaw detector is turned on, and the profiling wedge fixedly connected to the immersion probe is immersed in the water in the water tank, so that the profiling detection surface of the profiling wedge fits with the inner hole wall of the cylindrical aluminum alloy die casting; Finally, the profiling detection surface of the profiling wedge is fitted to the inner hole wall of the cylindrical aluminum alloy die-casting and moved to detect every part of the cylindrical wall of the cylindrical aluminum alloy die-casting. The ultrasonic wave emitted by the immersion probe is used to detect the skin defects of the aluminum die-casting through the ultrasonic flaw detector, and the castings with unqualified quality are found.
[0005] Furthermore, the diameter of the profiling detection surface of the profiling wedge is the same as the diameter of the inner hole wall of the cylindrical aluminum alloy die casting.
[0006] Furthermore, the material of the contoured wedge is nylon.
[0007] Furthermore, the immersion probe adopts an ultrasonic shear wave oblique probe.
[0008] Beneficial effects of the present invention: Compared with the prior art, the present invention can accurately and efficiently find out the problem of skin defects in aluminum die castings through non-destructive flaw detection technology such as ultrasonic flaw detection. Through actual application, the skin detection rate is 100%, which meets the detection requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a three-dimensional structural schematic diagram of a method for detecting skinning of a cylindrical aluminum alloy die casting according to the present invention; Figure 2 It is a schematic diagram of the main structure of an ultrasonic probe of a method for detecting skinning of a cylindrical aluminum alloy die casting according to the present invention; Figure 3 It is a schematic diagram of the upward-looking structure of an ultrasonic probe of a method for detecting skinning of a cylindrical aluminum alloy die casting according to the present invention; Figure 4 It is a pulse wave peak diagram of an echo when the ultrasonic probe in the present invention detects skin pinch; Figure 5 It is a continuous pulse wave peak diagram when the ultrasonic probe in the present invention detects the movement of the skin clamp.
[0010] As shown in the figure: 1-ultrasonic flaw detector, 2-water tank, 3-turntable, 4-cylindrical aluminum alloy die casting, 5-profile wedge, 6-fixing screw, 7-immersion probe. DETAILED DESCRIPTION
[0011] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0012] like Figures 1 to 3 As shown, the method for detecting skin inclusions of cylindrical aluminum alloy die castings comprises an ultrasonic flaw detector 1, a water immersion probe 7, a water tank 2, a turntable 3, and a cylindrical aluminum alloy die casting 4, wherein the water tank 2 is filled with water, and a turntable 3 is placed at the bottom of the water tank 2, a cylindrical aluminum alloy die casting 4 is placed on the turntable 3, an inner hole wall of the cylindrical aluminum alloy die casting 4 is fitted with a profiling detection surface of a profiling wedge 5, an immersion probe 7 is fixedly connected to the inner groove of the profiling wedge 5 by a fixing screw 6, and the immersion probe 7 is connected to the ultrasonic flaw detector 1 through a wire harness; The steps of the cylindrical aluminum die casting skin detection method are as follows: First, place the cylindrical aluminum alloy die casting 4 to be inspected on the turntable 3 at the bottom of the water tank 2, and at the same time, fill the water tank 2 with water, the water level should be higher than the upper surface of the cylindrical aluminum alloy die casting 4 to be inspected; Then, the ultrasonic flaw detector 1 is turned on, and the profiling wedge 5 fixedly connected to the immersion probe 7 is immersed in the water of the water tank 2, so that the profiling detection surface of the profiling wedge 5 fits with the inner hole wall of the cylindrical aluminum alloy die casting 4; Finally, the profiling detection surface of the profiling wedge 5 is moved to fit the inner hole wall of the cylindrical aluminum alloy die-casting 4 to detect every part of the cylindrical wall of the cylindrical aluminum alloy die-casting 4. The ultrasonic wave emitted by the immersion probe 7 is used to detect the skin defects of the aluminum die-casting through the ultrasonic flaw detector 1, and the castings with unqualified quality are found.
[0013] In this embodiment, the immersion probe 7 can adjust its position in the inner groove of the contoured wedge 5 by tightening the fixing screw 6, so as to facilitate the detection of cylindrical aluminum die-castings with different wall thicknesses; during detection, the cylindrical aluminum alloy die-casting is immersed in water, and water is used as a coupling agent to improve the propagation efficiency and detection sensitivity of ultrasonic waves; the cylindrical aluminum alloy die-casting is placed on the turntable 3, so as to facilitate the rotation and movement of the cylindrical aluminum alloy die-casting during detection.
[0014] like Figure 1 As shown, the diameter of the profiling detection surface of the profiling wedge 5 is the same as the diameter of the inner hole wall of the cylindrical aluminum alloy die casting 4. This implementation scheme is to ensure that the detection distance between the immersion probe 7 and the inner hole wall of the cylindrical aluminum alloy die casting 4 is constant, and to ensure the accuracy of the ultrasonic detection value.
[0015] like Figures 1 to 3 As shown, the material of the profiling wedge 5 is nylon material. This embodiment is to avoid scratching the surface of the aluminum alloy die casting during detection.
[0016] like Figure 2 As shown, the immersion probe 7 is an ultrasonic shear wave oblique probe. This embodiment utilizes ultrasonic pulse reflection flaw detection and adopts a shear wave oblique entry method, which can well identify the defects of the skin.
[0017] Specific detection method of the present invention: First, place the cylindrical aluminum alloy die casting 4 to be inspected on the turntable 3 at the bottom of the water tank 2, and at the same time, fill the water tank 2 with water, the water level should be higher than the upper surface of the cylindrical aluminum alloy die casting 4 to be inspected; Then, the ultrasonic flaw detector 1 is turned on, and the profiling wedge 5 fixedly connected to the immersion probe 7 is immersed in the water of the water tank 2, so that the profiling detection surface of the profiling wedge 5 fits with the inner hole wall of the cylindrical aluminum alloy die casting 4; Finally, the profiling detection surface of the profiling wedge 5 is moved in contact with the inner hole wall of the cylindrical aluminum alloy die casting 4 to detect every part of the cylindrical wall of the cylindrical aluminum alloy die casting 4. The ultrasonic wave emitted by the immersion probe 7 is used to detect the skin defect of the aluminum die casting through the ultrasonic flaw detector 1, and the castings with unqualified quality are found. During the flaw detection process, the ultrasonic flaw detector 1 displays the following Figure 4When the pulse peak diagram of the first echo is shown, it indicates that there is a skin-cage defect near the wall of the cylindrical aluminum alloy die-casting 4 detected by the immersion probe 7. When the immersion probe 7 continuously moves and detects at the location where the skin-cage defect is detected, the ultrasonic flaw detector 1 displays the following Figure 5 When the continuous pulse peak diagram is obtained, the skin defect and specific location of the cylindrical aluminum alloy die casting 4 can be determined. Through actual application, the skin detection rate is 100%, which meets the detection requirements.
[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any simple modification, equivalent replacement, improvement, etc. made within the technical concept of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for detecting skin inclusions in a cylindrical aluminum alloy die casting, comprising an ultrasonic flaw detector (1), a water immersion probe (7), a water tank (2), a turntable (3), and a cylindrical aluminum alloy die casting (4), characterized in that: The water tank (2) is filled with water, and a turntable (3) is placed at the bottom of the water tank (2). A cylindrical aluminum alloy die-casting (4) is placed on the turntable (3). The inner hole wall of the cylindrical aluminum alloy die-casting (4) is in contact with the contoured detection surface of a contoured wedge (5). An immersion probe (7) is fixedly connected to the inner groove of the contoured wedge (5) by a fixing screw (6). The immersion probe (7) is connected to the ultrasonic flaw detector (1) through a wire harness. The steps of the method for detecting the skin of the cylindrical aluminum alloy die casting are as follows: First, the cylindrical aluminum alloy die-casting (4) to be inspected is placed on a turntable (3) at the bottom of a water tank (2), and water is poured into the water tank (2) so that the water level is higher than the upper surface of the cylindrical aluminum alloy die-casting (4) to be inspected; Then, the ultrasonic flaw detector (1) is turned on, and the profiling wedge (5) fixedly connected to the immersion probe (7) is immersed in the water of the water tank (2), so that the profiling detection surface of the profiling wedge (5) is in contact with the inner hole wall of the cylindrical aluminum alloy die casting (4); Finally, the profiling detection surface of the profiling wedge (5) is moved in contact with the inner wall of the cylindrical aluminum alloy die casting (4) to detect every part of the cylindrical wall of the cylindrical aluminum alloy die casting (4). The ultrasonic wave emitted by the immersion probe (7) is used to detect the skin defect of the aluminum die casting through the ultrasonic flaw detector (1), and the casting with unqualified quality is found.
2. The method for detecting skinning of a cylindrical aluminum alloy die casting according to claim 1, characterized in that: The diameter of the profiling detection surface of the profiling wedge (5) is the same as the diameter of the inner hole wall of the cylindrical aluminum alloy die casting (4).
3. The method for detecting skinning of a cylindrical aluminum alloy die casting according to claim 1, characterized in that: The material of the contoured wedge (5) is nylon material.
4. The method for detecting skinning of a cylindrical aluminum alloy die casting according to claim 1, characterized in that: The immersion probe (7) is an ultrasonic shear wave oblique probe.