Auxiliary test block for detecting magnetic powder on processing surface of steel casting

Abstract

An auxiliary test block for magnetic particle detection of a steel casting machining surface is a square block, a section of groove with a semicircular section is formed in each of the two sides of the length direction on a side surface defined by the length direction and the width direction of the square block, the length direction of the groove is perpendicular to the length direction of the square block, and the width direction of the square block is perpendicular to the width direction of the square block. A plurality of grooves are formed in the square block, a plurality of rectangular grooves are formed in the bottom of each groove, the rectangular grooves are symmetrically arranged along the center line of the bottom face of the groove, the height of the rectangular grooves is arranged in the thickness direction of the square block, and the long edges of the rectangular grooves are arranged in the width direction of the square block; and a plurality of circular blind holes are formed in the side surface of the square block between the two sections of grooves along the center lines of the bottom surfaces of the grooves. By adopting the auxiliary test block provided by the invention, when a certain margin is reserved before the final processing size, the effective detection depth of the magnetic powder detection equipment has no influence on the defect control of the magnetic powder detection and repair on the final processing surface.

Description

Technical Field

[0001] The invention relates to the field of magnetic particle detection, in particular to an auxiliary test block used for magnetic particle detection of a machined surface of a steel casting, and belongs to the technical field of non-destructive detection. Background Art

[0002] The uniformity of the structure of steel castings is average. Although ultrasonic testing has been carried out for quality control during the acceptance of steel castings, it is common to find that the defects exceed the standard when magnetic particle testing is carried out on the machined surface after machining. In the process of local repair of defects exceeding the standard, the flatness of the machined surface will inevitably be affected; and the flatness requirements of parts such as the center surface are very high. The uneven surface caused during the repair process will affect the use of the workpiece. In order to solve this problem, a certain margin is left before the final machining size (for example, generally 0.3-0.5mm), and the magnetic particle inspection sequence and repair sequence of the machined surface are increased, so as to control the defects exceeding the standard on the final machined surface. However, the effective detection depth of the magnetic particle detection equipment (such as electromagnetic yoke for detection) will directly affect the defect control of the final machined surface by magnetic particle detection and repair when there is a margin.

[0003] In summary, the specific depth of magnetic particle inspection is obtained based on experience and industry communication, and has not been verified by experiments. How to avoid affecting the defect control of the final machined surface by magnetic particle inspection and rework when there is margin has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an auxiliary test block for magnetic particle inspection of the machined surface of a steel casting. When a certain margin is left before the final machining size, how to avoid the effective detection depth of the magnetic particle inspection equipment directly affects the defect control of the final machining surface by magnetic particle inspection and rework.

[0005] An auxiliary test block for magnetic particle detection of machined surfaces of steel castings, the auxiliary test block being a square block, with a groove 1 having a semicircular cross section opened on both sides of the length direction on the side surface surrounded by the length direction and the width direction of the square block, the length direction of the groove being perpendicular to the length direction of the square block, each groove having N rectangular grooves 2 opened at the bottom, each rectangular groove being symmetrically arranged along the center line of the groove bottom surface, the height of the rectangular groove being arranged along the thickness direction of the square block, the long side of the rectangular groove being arranged along the width direction of the square block, the detection depth of this simulated defect being equal to the difference between 1.2 and the depth value of the rectangular groove; on the side surface of the square block located between the two grooves, M circular blind holes are opened along the center line of the groove bottom surface, the detection depth of this simulated defect being equal to the difference between the thickness value of the square block and the depth value of the blind hole.

[0006] Furthermore, the square block is a square or rectangular block.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] Simulated artificial defect grooves / holes of different depths are made on the auxiliary test block of this application (the material is the same as that of the inspected workpiece) (the size of the simulated artificial defect corresponds to the display size of the magnetic powder defect in the standard). The depth of the magnetic powder inspection of the machined surface is quantified by this test block. If the inspection depth of this magnetic powder inspection process is greater than or equal to the machining allowance, then this magnetic powder inspection process can be implemented; if the inspection depth of this magnetic powder inspection process is less than the machining allowance, then the magnetic powder inspection process is improved or the machining allowance is reduced. By making this auxiliary test block, the specific values ​​of the inspection depths of different magnetic powder inspection processes can be accurately known, providing accurate guidance for the selection of machining surface allowances and magnetic powder inspection processes.

[0009] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a front view of an auxiliary test block used for magnetic particle testing of machined surfaces of steel castings in this application;

[0011] Figure 2 for Figure 1 Side view of

[0012] Figure 3 for Figure 1 AA view;

[0013] Figure 4 yes Figure 3 A partial enlarged view of the left groove;

[0014] Figure 5 yes Figure 3 A partial enlarged view of the right groove;

[0015] Figure 6 for Figure 3 A magnified view of point B;

[0016] Figure 7 for Figure 3 Enlarged view of point C;

[0017] Figure 8 Schematic diagram of using electromagnetic yoke to realize simulated defect depth detection.

[0018] The reference numerals are as follows:

[0019] 1. Groove, 1-1. First rectangular groove, 1-2. Second rectangular groove, 1-3. Third rectangular groove, 1-4. Fourth rectangular groove, 2-1. Fifth rectangular groove, 2-2. Sixth rectangular groove, 2-3. Seventh rectangular groove, 2-4. Eighth rectangular groove, 3-1. First blind hole, 3-2. Second blind hole, 3-3. Third blind hole, 3-4. Fourth blind hole, 4-1. Fifth blind hole, 4-2. Sixth blind hole, 4-3. Seventh blind hole, 4-4. Eighth blind hole. DETAILED DESCRIPTION

[0020] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. Unless otherwise specified, the technical terms or scientific terms used in the present application are generally understood by those skilled in the art to which the present invention belongs.

[0021] Reference Figure 1 and Figure 2 , an auxiliary test block for magnetic particle detection of machined surfaces of steel castings, the auxiliary test block being a square block, on the side surface surrounded by the length direction and the width direction of the square block, a groove 1 with a semicircular cross section is opened on both sides of the length direction, the length direction of the groove is perpendicular to the length direction of the square block, each groove has N rectangular grooves 2 at the bottom, each rectangular groove is symmetrically arranged along the center line of the groove bottom surface, the height of the rectangular groove is arranged along the thickness direction of the square block, and the long side of the rectangular groove is arranged along the width direction of the square block, the detection depth of this simulated defect is equal to the difference between 1.2 and the depth h1 of the rectangular groove, wherein 1.2 is the distance value from the center of the groove bottom surface to the other side surface of the square block; on the side surface of the square block located between the two grooves, M circular blind holes are opened along the center line of the groove bottom surface, the detection depth of this simulated defect is equal to the difference between 10 and the depth h2 of the blind hole, wherein 10 is the thickness value of the square block, in mm.

[0022] The outer shape of the square block is square or rectangular, preferably square, and its outer dimensions are 300mm×300mm×10mm.

[0023] The N rectangular grooves are arranged in various combinations of depth and length.

[0024] The M blind holes are arranged in various combinations of depth and diameter.

[0025] Reference Figure 1 , Figure 4 , Figure 5 and Figure 7 , the following scheme is given: N = 4, any one groove has two specifications of rectangular groove depth;

[0026] The corresponding dimensions of the rectangular groove with a depth of 0.95±0.04mm are: length 3.0±0.3mm, width 0.5±0.2mm, and length 1.0±0.1mm, width 0.3±0.1mm;

[0027] The corresponding dimensions of the rectangular groove with a depth of 0.7±0.04 mm are: length of 3.0±0.3 mm, width of 0.5±0.2 mm; and length of 1.0±0.1 mm, width of 0.3±0.1 mm.

[0028] The above parameters are preferably the size parameters of the four rectangular grooves in the left groove in the figure, and can also be the size parameters of the four rectangular grooves in the right groove.

[0029] N = 4, any one groove has two rectangular grooves of different depths;

[0030] The corresponding dimensions of the rectangular groove with a depth of 0.45±0.04mm are: length 3.0±0.3mm, width 0.5±0.2mm, and length 1.0±0.1mm, width 0.3±0.1mm;

[0031] The corresponding dimensions of the rectangular groove with a depth of 0.2±0.04 mm are: length of 3.0±0.3 mm, width of 0.5±0.2 mm; and length of 1.0±0.1 mm, width of 0.3±0.1 mm.

[0032] The above parameters are preferably the size parameters of the four rectangular grooves in the right groove in the figure, and can also be the size parameters of the four rectangular grooves in the left groove.

[0033] The parameters are arranged as shown in Table 1.

[0034]

[0035] Reference Figure 3 and Figure 6 , M = 8, eight circular blind holes are divided into four specifications of blind holes in depth;

[0036] Four blind holes of different depths are set in sequence, and every two adjacent blind holes have the same depth.

[0037] The diameters of blind holes with a depth of 9.75±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; the diameters of blind holes with a depth of 9.50±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; the diameters of blind holes with a depth of 9.25±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; the diameters of blind holes with a depth of 9.00±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively.

[0038] The parameters are arranged as shown in Table 2.

[0039]

[0040] The test blocks are made based on the parameters in Tables 1 and 2 above. The test blocks are made of materials similar or close to the material of the steel castings. The opening width of the groove 1 in the square block is 20 mm and the length is 85 mm. The tolerances of the thickness of the test block (10 mm) and the distance from the center of the bottom of the groove to the other side of the square block (1.2 mm) are both ±0.05 mm; the tolerances of the other dimensions do not exceed 1%.

[0041] Reference Figure 8 The detection principle of the scheme of this application is further explained:

[0042] Take the electromagnetic yoke as an example to introduce the use of the test block:

[0043] Place the test block with the grooved upper surface facing downward and the lower surface facing upward. Adjust the electromagnetic yoke contact spacing and current according to the magnetic particle inspection operation instructions, and make the electromagnetic yoke contact connection line perpendicular to the artificial injury layout direction (such as Figure 8 ), perform magnetic particle inspection from left to right, and observe and record the magnetic particle traces clearly displayed under appropriate lighting conditions.

[0044] According to the standard acceptance level, compared with the magnetic particle inspection records, different types of displays can meet the standard requirements of a group of defect displays, the deepest simulated defect (that is, the simulated defect closest to the lower surface) is the magnetic particle inspection depth under this magnetic particle inspection operation instruction. Table 1 The detection depth of rectangular simulated defects = 1.2mm-h1 (h1 is the nominal depth of rectangular simulated defects); Table 2 The detection depth of circular simulated defects = 10mm-h2 (h2 is the nominal depth of circular simulated defects).

[0045] For example: if the standard requires that the linear display allowed is no larger than 3mm; the circular display is no larger than 3mm. When testing the magnetic particle inspection work instruction, 1-1, 1-2, 1-3 and 4-1, 4-2 can all be displayed, then the effective detection depth of this magnetic particle inspection work instruction is 1.2-0.7=0.5mm.

[0046] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present application. Any technician familiar with the profession can make slight changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present application, which still fall within the scope of the technical solution of the present application.

Claims

1. An auxiliary test block for magnetic particle testing of machined surfaces of steel castings, characterized in that: The auxiliary test block is a square block. On the side surface surrounded by the length direction and the width direction of the square block, a groove (1) with a semicircular cross section is opened on both sides of the length direction. The length direction of the groove is perpendicular to the length direction of the square block. Each groove has N rectangular grooves at the bottom. Each rectangular groove is symmetrically arranged along the center line of the bottom surface of the groove. The height of the rectangular groove is arranged along the thickness direction of the square block. The long side of the rectangular groove is arranged along the width direction of the square block. The detection depth of this simulated defect is equal to the difference between 1.2 and the depth value of the rectangular groove. On the side surface of the square block located between the two grooves, M circular blind holes are opened along the center line of the bottom surface of the groove. The detection depth of this simulated defect is equal to the difference between the thickness of the square block and the depth of the blind hole.

2. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: N = 4, any one groove has two rectangular grooves of different depths; The corresponding dimensions of the rectangular groove with a depth of 0.95±0.04mm are: length 3.0±0.3mm, width 0.5±0.2mm, and length 1.0±0.1mm, width 0.3±0.1mm; The corresponding dimensions of the rectangular groove with a depth of 0.7±0.04 mm are: length of 3.0±0.3 mm, width of 0.5±0.2 mm; and length of 1.0±0.1 mm, width of 0.3±0.1 mm.

3. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: N = 4, any one groove has two rectangular grooves of different depths; The corresponding dimensions of the rectangular groove with a depth of 0.45±0.04mm are: length 3.0±0.3mm, width 0.5±0.2mm, and length 1.0±0.1mm, width 0.3±0.1mm; The corresponding dimensions of the rectangular groove with a depth of 0.2±0.04 mm are: length of 3.0±0.3 mm, width of 0.5±0.2 mm; and length of 1.0±0.1 mm, width of 0.3±0.1 mm.

4. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: M=8, eight blind holes are divided into four blind holes with different depths; Four blind holes of different depths are set in sequence, and every two adjacent blind holes have the same depth. The diameters of blind holes with a depth of 9.75±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; The diameters of blind holes with a depth of 9.50±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; The diameters of blind holes with a depth of 9.25±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively; The diameters of the blind holes with a depth of 9.00±0.04mm are 1.5±0.15mm and 3.0±0.3mm respectively.

5. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 4, characterized in that: The horizontal distance between the center lines of two adjacent blind holes is 10 mm.

6. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: The dimensions of the square block are: 300mm×300mm×10mm.

7. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: The thickness tolerance of the square block is ±0.05mm.

8. The auxiliary test block for magnetic particle testing of machined surfaces of steel castings according to claim 1, characterized in that: The opening width of the groove (1) is 20 mm and the length is 85 mm.

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