A calibration method for a large-range deep hole probe
By making a standard ring gauge and performing zero-line calibration and multi-circle calibration, the calibration problem of deep hole detection equipment with a length greater than 50mm in the existing technology was solved, and high-precision and low-cost deep hole detection was achieved.
Patent Information
- Application Number
- CN202310541693.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-12
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2043-05-12
AI Technical Summary
Existing technology cannot effectively calibrate deep hole detection equipment with a length greater than 50 mm, resulting in difficulty in ensuring deep hole detection accuracy and high costs.
A standard ring gauge is used to calibrate deep hole inspection equipment. By making a standard ring gauge and utilizing the radius difference between its inner hole and outer circle, the shape and position tolerances affected by excessive wall thickness are avoided. The measuring lines are marked to achieve the calibration of the zero position line and the precise calibration of multiple cut circles.
It achieves accurate calibration of deep hole detection equipment with a length greater than 50mm, improves detection accuracy and reduces costs.
Smart Images
Figure CN116399202B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of detection technology, in particular to a calibration method for a large-range deep hole probe. Background Art
[0002] With the advancement of digital testing technology, deep-hole machining inspection equipment and technology have also evolved, evolving from conformity-based, indirect testing using rigid gauges to digital testing. This technology utilizes optical technologies such as inductance, electronics, and lasers to acquire test data, which is then stored and processed using computer software for intuitive results. This technology meets the needs of rapid product testing and evaluation, ensuring quality traceability, controlling fluctuations in process quality characteristics, and ensuring product quality stability. However, this type of testing requires calibration using standard ring gauges to ensure accurate deep-hole diameter measurement. Currently, standard ring gauges range from 6 to 8 mm in diameter, with a maximum height of 15 to 20 mm and a calibrable height range of 0 to 20 mm. Calibration of equipment with a height of 20 to 50 mm exceeds the standard ring gauge's maximum height of 20 mm, requiring customization and requiring higher precision and cost. Equipment with a calibration height of more than 50 mm cannot be calibrated for deep-hole inspection equipment longer than 50 mm, as the gauges cannot be machined. Due to factors such as surface roughness and geometric tolerances of small-diameter deep holes, deep hole inspection technology still has many problems to be solved, which restricts the development of digital deep hole inspection technology.
[0003] With the development of scientific research and continuous practical verification, breakthroughs in this type of detection method can effectively benchmark deep hole accuracy and fill the gap in the lack of large-scale deep hole probe calibration methods. Summary of the Invention
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a calibration method for a large-scale deep hole probe, which can calibrate a large-scale deep hole detection device.
[0005] The object of the present invention is achieved like this:
[0006] A calibration method for a large-range deep hole probe, the calibration method comprising the following steps:
[0007] S1. Make a standard ring gauge based on the equipment to be calibrated. The total length of the standard ring gauge to be calibrated is L. Take a cross-section of each length N for calibration, and calibrate a total of (L ÷ N) + 1 cross-section diameter value;
[0008] S2. Place the standard ring gauge vertically on the elastic clamp of the device to be calibrated, align the zero mark with the upper end surface of the elastic clamp, and clamp it securely. Then, insert the probe of the device to be calibrated into the inner hole of the standard ring gauge, and calibrate the diameter value at the zero position to complete the calibration of the zero mark;
[0009] S3. After the zero mark calibration is completed, move the probe away, move the standard ring gauge downward by a length of N, and then calibrate again until the calibration of all the marks is completed.
[0010] Preferably, L=5N-20N.
[0011] Preferably, the difference in radius between the inner hole and the outer circle of the standard ring gauge is greater than 3 mm.
[0012] Preferably, the method for making the standard ring gauge is as follows: using the outer circle of the mandrel as the positioning reference, drilling the inner hole of the standard ring gauge on the upper end face of the mandrel, the hole depth of the inner hole on the upper end of the mandrel is greater than the distance from the probe to the lower end face of the stylus of the calibrated device, and marking the corresponding measurement lines on the outer circle of the standard mandrel according to the calibration depth required by the calibrated device.
[0013] Due to the adoption of the above technical solution, the present invention can calibrate a large range of deep hole detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the standard ring gauge structure;
[0015] Figure 2 Schematic diagram of the stylus structure of the device being calibrated;
[0016] Figure 3 It is a calibration schematic diagram of the present invention. DETAILED DESCRIPTION
[0017] 1. The structure of standard ring gauge:
[0018] See also Figure 1 , is a standard ring gauge with a total length of L1. During production, the outer circle of the standard mandrel is used as the positioning reference, and a hole is drilled on the upper end face of the mandrel (inner hole of the ring gauge). The hole size is set according to the detection range of the calibration equipment being measured. The hole diameter can be customized in any range. The radius difference between the inner hole and the outer circle of the ring gauge (wall thickness) should be greater than 3mm to avoid the influence of too thin wall thickness on the form and position tolerance. The hole depth L2 of the inner hole of the ring gauge is determined according to the distance L3 from the probe head to the lower end face of the probe, and a safe distance is retained to avoid collision with the probe.
[0019] According to the calibration depth required by the calibrated equipment, mark the corresponding depth on the outer circle of the standard mandrel ( Figure 1 The standard ring gauge is produced by measuring the scale line in the middle.
[0020] 2. Calibration method:
[0021] Take, for example, a device for measuring the inner diameter of a long tube (the device being calibrated). This device needs to measure the diameter of the inner diameter of a long tube (the standard ring gauge is manufactured based on this long tube). The diameter of the inner tube is ≤φ6mm, and the total length to be calibrated is Lmm. The measurement is performed using a circle with a length of Nmm as one circle, where L = 5N - 20N. A total of (L ÷ N) + 1 circle diameter value must be measured. Therefore, when calibrating the device, the probe parameters (L ÷ N) + 1 height must be calibrated.
[0022] In this embodiment, a standard ring gauge is made. The total length of the standard ring gauge is 500 mm and the hole diameter is φ6 mm. The calibration method is:
[0023] Step 1: Select a section circle with a length of 50mm for testing. A total of 11 section circle diameter values need to be tested.
[0024] Step 2: Place the standard ring gauge vertically on the elastic clamp of the testing equipment (equipment to be calibrated), and press the clamp start button after positioning to fix the standard ring gauge. Align the zero mark with the first height position of the test (the upper end surface of the elastic clamp), as shown in the figure. Figure 3 As shown, calibration starts from 0.
[0025] Step 3: After calibration, remove the probe, move the standard ring gauge downward 50mm, and start calibration from the 50mm mark on the measuring scale. Repeat this process to complete the calibration of 11 cross-sections in the height direction. This solves the problem of calibrating the long tube inner hole diameter detection device at 11 cross sections in the height direction.
[0026] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.
Claims
1. A calibration method for a large-range deep hole probe, characterized in that: The calibration method includes the following steps: S1. Make a standard ring gauge based on the equipment to be calibrated. The total length of the standard ring gauge to be calibrated is L. Take a cross-section circle every length N for calibration, and calibrate a total of (L ÷ N) + 1 cross-section circle diameter values; S2. Place the standard ring gauge vertically on the elastic clamp of the device to be calibrated, align the zero mark with the upper end surface of the elastic clamp, and clamp it securely. Then, insert the probe of the device to be calibrated into the inner hole of the standard ring gauge, and calibrate the diameter value at the zero position to complete the calibration of the zero mark; S3. After the zero mark calibration is completed, move the probe away, move the standard ring gauge downward by a length of N, and then calibrate again until the calibration of all the marks is completed.
2. The method for calibrating a large-range deep hole probe according to claim 1, characterized in that: L=5N-20N.
3. The method for calibrating a large-range deep hole probe according to claim 1, characterized in that: The difference in radius between the inner hole and the outer circle of a standard ring gauge is greater than 3mm.
4. The calibration method of a large-range deep hole probe according to claim 1, characterized in that: The production method of the standard ring gauge is as follows: the outer circle of the mandrel is used as the positioning reference, and the inner hole of the standard ring gauge is drilled on the upper end face of the mandrel. The hole depth of the inner hole on the upper end of the mandrel is greater than the distance from the probe to the lower end face of the stylus of the calibrated equipment. According to the calibration depth required by the calibrated equipment, the corresponding measurement scale is marked on the outer circle of the standard mandrel.