Ultrasonic flaw detection test block for metal hardening layer

Abstract

The utility model relates to an ultrasonic flaw detection test block for a metal hardening layer, which is used for solving the problem that flaw echoes exist in the metal hardening layer and cannot be distinguished and accurately judged, the test block is made of detected metal, the base body of the flaw detection test block is a step solid body of 180mm * 100mm * 180mm, the limit deviations of the length, the height and the width of the test block are + / -0.1 mm, and the thickness of the test block is 0.1 mm. Nine layers of steps are uniformly distributed on the test block, three transverse holes are uniformly distributed on each step surface, the nine layers of steps are arc steps with the radiuses of 251 mm, 236 mm, 226 mm, 216 mm, 206 mm, 186 mm, 176 mm, 166 mm and 156 mm, the height of the steps is 20 mm, three transverse holes with the diameter of 0.5 mm and the depth of 10 mm are uniformly distributed on each layer of step surface, the center straight line interval of the three transverse holes is 25 mm, the distance between the center straight line and the arc edge is 25 mm, and by combining the series of transverse hole defects of the test block, the height of the test block can be determined. The ultrasonic flaw detector can be quickly calibrated, and the ultrasonic flaw detection accuracy and the flaw detection efficiency are ensured to be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of metal material ultrasonic detection, and particularly relates to a metal hardened layer ultrasonic flaw detection test block for solving the problem that defects echo in a metal hardened layer cannot be distinguished and accurately judged. BACKGROUND

[0002] The thickness of the hardened layer of the metal workpiece is less than or equal to 15 mm, the diameters of the metal workpieces are different, corresponding test blocks adopt horizontal holes as artificial defects, and before metal hardened layer ultrasonic flaw detection is performed each time, test blocks with different horizontal hole defects need to be selected to calibrate the ultrasonic flaw detector, and therefore a metal hardened layer ultrasonic flaw detection test block is needed to integrate horizontal hole defects of metal workpieces with different diameters, and in combination with series horizontal hole defects of the test block, the ultrasonic flaw detector can be quickly calibrated, and the ultrasonic flaw detection efficiency of defects in the metal hardened layer is improved. SUMMARY

[0003] The utility model discloses a kind of metal hardened layer ultrasonic flaw detection test blocks for effectively identifying metal hardened layer defects, in combination with series horizontal hole defects of this test block, ultrasonic flaw detector can be quickly calibrated, ensure that ultrasonic flaw detection is accurate and the detection efficiency is improved.

[0004] To achieve the above object, the utility model adopts the technical scheme as follows: a metal hardened layer ultrasonic flaw detection test block, including the test block of being detected metal and its material quality, curvature, surface roughness, heat treatment condition, hardened layer condition being same with the metal of being detected, the base body of the test block is 180mm×100mm×180mm's step solid, the limit deviation of length and height, width of test block is ±0.1mm, 9 layers of steps are uniformly distributed on this test block, and 3 horizontal holes are uniformly distributed on each step surface.

[0005] 9 layers of steps are circular arc steps with radius of 251mm, 236mm, 226mm, 216mm, 206mm, 186mm, 176mm, 166mm, 156mm, which are sequentially machined on the test block, and the step height is 20mm, 3 horizontal holes with diameter of 0.5mm and depth of 10mm are uniformly distributed on each step surface, the center straight line interval of the 3 horizontal holes is 25mm, and the distance from the arc to the hole wall is 1mm, 3mm and 5mm respectively, the surface roughness Ra of the arc surface is less than or equal to 1.6μm, the surface roughness Ra of the remaining surface is less than or equal to 6.3μm, the horizontal hole diameter tolerance is ±0.01mm, the hole bottom flatness error should not be more than ±0.03mm, and the hole surface roughness Ra is not more than 3.2μm.

[0006] The utility model has the beneficial effects as follows:

[0007] Ultrasonic testing was used to inspect the hardened metal layer of this ultrasonic flaw detection test block. The ultrasonic testing probe (straight probe and angle probe) scanned the outer arc surface of the test block, achieving 100% coverage of transverse hole defects. The detection distance and sensitivity were adjusted using the transverse holes. The transverse hole defect display signal on the ultrasonic flaw detector screen was adjusted to the reference wave height, and an alarm zone was set, thus meeting the ultrasonic flaw detection requirements of hardened metal workpieces of different diameters.

[0008] In ultrasonic testing of the hardened layer of metal workpieces of different diameters, if no defect signal exceeds the alarm level, the ultrasonic testing of the hardened layer of the metal workpiece can be considered qualified. Its advantages include rapid identification of defect echoes, improving testing efficiency and the accuracy of the results. Attached Figure Description

[0009] Figure 1 The middle part is a schematic diagram of the flaw detection test block of this utility model.

[0010] Figure 2 This is a side view of the flaw detection test block of this utility model.

[0011] The figure shows: 1. Flaw detection test block, 2. Horizontal hole 2. Detailed Implementation

[0012] like Figure 1 , 2 As shown, an ultrasonic flaw detection test block for a hardened metal layer is provided. The test block is made from the metal being tested, and its material, curvature, surface roughness, heat treatment condition, and hardened layer condition are the same as those of the metal being tested. The test block substrate is a solid stepped body of 180mm × 100mm × 180mm, and the limit deviation of the length, height, and width of the test block is ±0.1mm. Nine evenly distributed steps are machined on this test block 1, and three transverse holes 2 are evenly distributed on the surface of each step.

[0013] The nine-tiered steps are circular arc steps with radii of 251mm, 236mm, 226mm, 216mm, 206mm, 186mm, 176mm, 166mm, and 156mm, with a step height of 20mm. Each step surface has three evenly distributed horizontal holes with a diameter of 0.5mm and a depth of 10mm. The centers of the three holes are spaced 25mm apart and 25mm from the edge of the arc. The hole walls are 1mm, 3mm, and 5mm from the arc, respectively. The surface roughness Ra of the arc surface is ≤1.6μm, and the surface roughness Ra of the other surfaces is ≤6.3μm. The diameter tolerance of the horizontal holes is ±0.01mm; the flatness error of the hole bottom should not exceed ±0.03mm, and the surface roughness (Ra) of all holes should not exceed 3.2μm.

[0014] Example 1: As Figure 1 , 2As shown, an ultrasonic flaw detection test block for a hardened metal layer is provided. The test block 1 is made from the metal being tested, and its material, curvature, surface roughness, heat treatment condition, and hardened layer condition are the same as those of the metal being tested. The base of the flaw detection test block 1 is a solid stepped body of 180mm×100mm×180mm, and the limit deviation of the length, height, and width of the test block 1 is ±0.1mm.

[0015] like Figure 1 As shown, circular arc steps with radii of 251mm, 236mm, 226mm, 216mm, 206mm, 186mm, 176mm, 166mm, and 156mm were sequentially machined on test block 1. The step height was 20mm. Three horizontal holes were evenly distributed on each step surface, with a straight-line interval of 25mm between the centers of the three horizontal holes and a distance of 25mm from the edge of the arc. The distances of the hole walls from the arc were 1mm, 3mm, and 5mm, respectively.

[0016] like Figure 2 As shown, the surface roughness Ra of the arc surface should be ≤1.6μm, and the surface roughness Ra of the other surfaces should be ≤6.3μm. The diameter tolerance of the transverse hole is ±0.01mm; the flatness error of the hole bottom should not exceed ±0.03mm, and the surface roughness (Ra) of all holes should not be greater than 3.2μm.

[0017] Ultrasonic testing was used to inspect the hardened metal layer of the ultrasonic testing test block 1. The ultrasonic testing probe (straight probe and angle probe) scanned the arc surface of the test block, achieving 100% coverage of the transverse hole 2 defect. The detection distance and detection sensitivity were adjusted using the transverse hole 2 defect. The display signal of the transverse hole 2 defect on the screen of the ultrasonic flaw detector was adjusted to the reference wave height, and an alarm zone was set, thus meeting the ultrasonic flaw detection requirements of hardened metal workpieces of different diameters.

Claims

1. A metal hardened layer ultrasonic testing block, comprising a testing block (1) made of a metal to be tested and having the same material, curvature, surface roughness, heat treatment condition and hardened layer condition as the metal to be tested, characterized in that: The base body of the flaw detection test block (1) is a stepped solid body with a size of 180mm*100mm*180mm, the limit deviation of the length and height and width of the flaw detection test block (1) is ±0.1mm, and 9 layers of stepped surfaces are uniformly distributed on the flaw detection test block (1), and 3 horizontal holes (2) are uniformly distributed on each stepped surface.

2. A metal hardened layer ultrasonic testing block according to claim 1, characterized in that: The 9 layers of stepped surfaces are circular arc stepped surfaces with a radius of 251mm, 236mm, 226mm, 216mm, 206mm, 186mm, 176mm, 166mm and 156mm, which are sequentially machined on the test block (1), the height of each layer of stepped surface is 20mm, 3 horizontal holes (2) with a diameter of 0.5mm and a depth of 10mm are uniformly distributed on each layer of stepped surface, the center straight lines of the 3 horizontal holes (2) are spaced by 25mm, and the distance from the horizontal holes (2) to the edge of the fan surface is 25mm; the hole wall is 1mm, 3mm and 5mm away from the circular arc respectively; the surface roughness Ra of the circular arc surface is ≤1.6μm, the surface roughness Ra of the remaining surfaces is ≤6.3μm; the horizontal hole diameter tolerance is ±0.01mm; the hole bottom flatness error should not exceed ±0.03mm, and the surface roughness Ra of all holes is not greater than 3.2μm.

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