Micro-hole angle detection method on thin-walled part

Abstract

The application discloses a kind of micro-hole angle detection methods of thin-walled parts, it is characterized in that, its hardware includes: five-axis three coordinates, optical fiber lamp, high-precision camera, each coordinate position standard ball, tooling, computer;Its method is: using the detection accuracy of three coordinates, the length of optical fiber lamp is used to accurately detect the angle of small inclined hole on thin-walled part first calibrate five-axis three coordinates with standard ball, then use optical method to calibrate the datum of tooling and product, so that tooling and product have an accurate positioning datum in the three coordinate coordinate system of five-axis three coordinates, then move and rotate optical fiber lamp through XYZ three directions, focus light through micro-hole, make high-precision camera capture micro-hole light, then measure each micro-hole angle using three coordinate measurement program.The beneficial effects of the application are: 1. simple and reliable, low cost;2. high efficiency;3. can detect accurately, high precision.

Description

Technical Field

[0001] This invention relates to the field of angle detection technology, and in particular to a method for detecting the angle of microholes on thin-walled parts. Background Technology

[0002] As the automotive engine industry develops towards higher precision and lower emissions, the requirements for injection angles in engines are becoming increasingly stringent, especially for methanol and ammonia-hydrogen injection systems, which require more precise injection angles. Currently, most engine injection actuators are micro-orifices (below 0.2mm) and thin-walled parts (below 0.5mm). The main method for angle detection is the pin insertion method, which involves inserting a small pin gauge into a small hole and measuring the angle of the pin gauge. This method has a large detection error, primarily because it is difficult to guarantee the fit clearance between the pin gauge and the micro-orifice. Secondly, the 0.2mm pin gauge is too small and easily bends, resulting in a large detection error. According to national standards, the unspecified tolerance for holes with a length of less than 10mm is ±1°, while the pin gauge method has a detection error exceeding 5°.

[0003] To this end, the applicant has conducted beneficial explorations and attempts, and found a solution to the above problems. The technical solution to be introduced below was developed in this context. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a method for detecting the micro-hole angle of thin-walled parts, addressing the shortcomings of existing technologies, ensuring accurate detection with an error not exceeding ±1°.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A method for detecting the angle of micro-holes in thin-walled parts, comprising the following hardware: a five-axis coordinate measuring machine, a fiber optic lamp, a high-precision camera, standard spheres for each coordinate position, tooling, and a computer; and the method thereof: utilizing the accuracy of the three-axis coordinate measuring machine and the length of the fiber optic lamp to accurately detect the angle of the micro-slanted holes on the thin-walled parts.

[0007] In a preferred embodiment of the present invention, the five-axis three-coordinate system is first calibrated using a standard sphere, and then the tooling and product are calibrated using optical methods to ensure that the tooling and product have an accurate positioning reference in the three-coordinate system of the five-axis three-coordinate system. Then, the fiber optic lamp is adjusted by moving and rotating in the XYZ directions to focus the light through the micro-hole, so that the high-precision camera captures the light from the micro-hole. Finally, the angle of each micro-hole is measured using a three-coordinate measurement program.

[0008] Explanation of the principle of this invention:

[0009] The accuracy of angle detection is related to length; the shorter the length, the greater the measurement error. To improve detection accuracy, the measurement of the micro-aperture needs to be extended. This invention uses an optical method to extend the micro-aperture. Utilizing the positioning accuracy of a three-axis coordinate system and the computational power of the program, the axial reference points of each direction of the five-axis three-axis coordinate system and the tooling reference points are first calibrated. Then, a high-precision camera captures the light emitted from the micro-aperture. After calibrating the focal length, the angle of the light emitted by the five-axis three-axis coordinate system is the angle of the micro-aperture on the product. The CGK value obtained by this method, as analyzed by the measurement system, conforms to national standards.

[0010] The advantages of this invention are as follows:

[0011] 1. The adoption of general-purpose testing equipment allows for wide adaptability;

[0012] 2. Fiber optic lights, high-precision cameras, etc., are easy to procure;

[0013] 3. The tooling is simple to fabricate and install;

[0014] 4. The measurement operation is simple, fast, and accurate.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] 1. Compared to imported testing equipment, this solution is simple, reliable, and low-cost;

[0017] 2. Accurate and efficient detection;

[0018] 3. Suitable for inspection and control of products with strict angle requirements. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a method for detecting the micro-hole angle of a thin-walled component according to the present invention.

[0020] Figure 2 This is a partial enlarged view of the tooling, product, and fiber optic lamp of the present invention. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below, but this does not limit the present invention to the scope of the embodiments described.

[0022] See Figure 1 The method for detecting the angle of tiny oblique holes on a thin-walled part, as shown in the figure, includes: 1. Computer; 2. Five-axis three-coordinate measuring machine; 3. High-precision camera; 4. Fixture; 5. Standard spheres for each coordinate axis.

[0023] like Figure 2Product 7 is installed on fixture 8. After positioning and locking, the fiber optic lamp 10 is adjusted to the center position of the micro-hole. Then, the fiber optic lamp 10 and fixture 4 are locked and fixed on the spindle of the five-axis three-coordinate 2. Then, the standard ball 5 of each coordinate axis in the three-coordinate X, Y and Z directions and the optical reference point 9 on fixture 4 are calibrated. After calibration, the position of product 7 is magnified and adjusted on the monitor of computer 1 so that the micro-hole is aligned with the high-precision camera 3. After accurate positioning, the software is started to measure all the holes according to the programmed content.

Claims

1. A method for detecting the angle of microholes in a thin-walled component, characterized in that, Its hardware includes: a five-axis three-coordinate measuring machine, fiber optic lamps, a high-precision camera, standard spheres for each coordinate position, tooling, and a computer; its method is to utilize the detection accuracy of the three-coordinate measuring machine and the length of the fiber optic lamp to accurately detect the angle of the tiny oblique holes on the thin-walled parts.

2. The method for detecting the micro-hole angle of a thin-walled component according to claim 1, characterized in that, First, the five-axis three-coordinate system is calibrated using a standard sphere. Then, optical methods are used to perform benchmark calibration on the tooling and product, so that the tooling and product have an accurate positioning benchmark in the three-coordinate system of the five-axis three-coordinate system. Then, the fiber optic lamp is adjusted by moving and rotating in the XYZ directions to focus the light through the micro-hole, so that the high-precision camera can capture the light from the micro-hole. Finally, the angle of each micro-hole is measured using a three-coordinate measurement program.

Images