Magnetic right-angle testing fixture for perpendicularity detection

Abstract

The magnetic right-angle gauge comprises a cylindrical gauge body made of bearing steel, a powerful magnetic block is embedded in the gauge body, an auxiliary plate is magnetically attracted to the front end of the powerful magnetic block, the front end of the gauge body is provided with a counter bore, and the auxiliary plate is located in the counter bore. The right-angle detection tool is simple in structure, low in processing difficulty, convenient to use and rapid in detection, can be flexibly applied to various detection environments, eliminates the influence of the precision error of the detection tool on the detection result, and is high in detection precision and accuracy of the verticality of parts. The right-angle detection tool solves the problems that part perpendicularity detection wastes time and labor and is limited by conditions of detection equipment, and the perpendicularity of the part can be easily, visually, accurately and reliably detected. The right-angle detection tool is flexible in application, and detection tool bodies with different precisions and different lengths can be designed for different parts to be detected so as to adapt to various detection precision requirements of different detection environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to a testing fixture, in particular to a magnetic right-angle testing fixture for perpendicularity detection. BACKGROUND

[0002] Perpendicularity is a common tolerance requirement in part design. Usually, the perpendicularity detection of two planes on a part needs to use a three-coordinate measuring center or other detection equipment, and the detection process is time-consuming and laborious, and is limited by the stroke of the detection equipment and the shape of the part. This leads to certain difficulties in the perpendicularity detection of both large quantities of similar parts and small quantities of special parts, especially in the scene that needs to be detected quickly. SUMMARY

[0003] The utility model solves the technical problem that, in view of the shortage of prior art, provide a perpendicularity detection magnetic right-angle testing fixture, the right-angle testing fixture simple structure, the processing difficulty is low, convenient to use, the detection is fast, can be flexibly applied to various detection environment, realizes the high accuracy detection of the perpendicularity of the part.

[0004] The utility model discloses a perpendicularity detection magnetic right-angle testing fixture that the technical scheme adopted by the utility model to solve the above technical problem comprises the cylindrical testing fixture body made of bearing steel, the strong magnetic block is embedded and installed in the testing fixture body, the front end of the strong magnetic block is magnetically attracted to the auxiliary plate, the front end of the testing fixture body is provided with a counterbore, and the auxiliary plate is located in the counterbore.

[0005] The right-angle testing fixture is used for detecting the perpendicularity of a part, and when in use, only the front end of the testing fixture body is adsorbed on the surface of the part to be detected, and then detection can be started. When detecting, the average of the two detection values of the 0° position (i.e. the initial position of the testing fixture) and the 180° position (i.e. the position after the testing fixture rotates 180° around the center line from the initial position) of the testing fixture is recorded as the perpendicularity of the two surfaces on the part, so that the influence of the precision error of the testing fixture itself on the detection result is eliminated, and the detection precision and accuracy are high.

[0006] Preferably, the cylindricity of the outer circular surface of the testing fixture body is 0.002-0.003 mm, and the roughness is within Ra0.4; and the flatness and perpendicularity of the front side and the rear side of the testing fixture body are respectively 0.002-0.003 mm, and the roughness is respectively within Ra0.4, so as to ensure the detection precision of the perpendicularity of the part.

[0007] Preferably, the testing fixture body is provided with a cylindrical hole, the front end of the cylindrical hole is open, and the strong magnetic block is embedded and installed at the front end of the cylindrical hole. The hollow structure of the testing fixture body is light in weight, and convenient to use and carry.

[0008] As preferred, the front end of the gauge body is integrally provided with a flange part, the cylindrical hole extends to the flange part, and the counterbore is arranged at the front end of the flange part. The flange part is designed to facilitate the design of auxiliary plates of different sizes according to actual detection needs, improve the versatility of the gauge body, and thus meet the perpendicularity detection needs of parts of different specifications.

[0009] As preferred, the strong magnetic block is fixed at the front end of the cylindrical hole by strong glue. The strong magnetic block is fixed to the gauge body by strong glue, facilitating assembly and not affecting the accuracy of the gauge body.

[0010] As preferred, a transition hole is arranged between the cylindrical hole and the counterbore, the strong magnetic block comprises a narrow-diameter section and a wide-diameter section which are integrally arranged in front and back, the narrow-diameter section is located in the cylindrical hole, the wide-diameter section is located in the transition hole, the outer cylindrical surface of the narrow-diameter section and the inner surface of the cylindrical hole have a first annular gap, the outer cylindrical surface of the wide-diameter section and the inner surface of the transition hole have a second annular gap, the front side surface of the wide-diameter section and the rear side surface of the auxiliary plate have a third gap, the first gap and the third gap are respectively communicated with the second gap, a glue filling hole is arranged in the radial upper side wall of the flange part, the glue filling hole is communicated with the second gap, and the strong glue is filled into the second gap and the third gap through the glue filling hole. Before glue filling, the narrow-diameter section of the strong magnetic block is first sunk into the cylindrical hole, and then the auxiliary plate is attached to the counterbore at the front end of the gauge body. The auxiliary plate is attached to the gauge body under the magnetic force of the strong magnetic block, and there is no need to additionally press the auxiliary plate. Finally, an external glue pipe is connected to the glue filling hole, and the strong glue is filled into the glue filling hole through the glue pipe. During glue filling, the first gap discharges the gas in the glue filling hole, the second gap and the third gap into the cylindrical hole in the gauge body, effectively prevents the glue from overflowing upwards, and fills the glue into the second gap and the third gap. After the glue solidifies, the glue pipe is removed. The glue filling process does not affect the accuracy of the gauge body.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] (1) The magnetic right-angle gauge for perpendicularity detection solves the problems of time-consuming and laborious part perpendicularity detection and detection equipment condition limitation, and can easily, intuitively, accurately and reliably detect the perpendicularity of parts.

[0013] (2) The magnetic right-angle gauge for perpendicularity testing of this utility model has a simple structure, low processing difficulty, convenient use, and fast testing. It can be flexibly applied to various testing environments to achieve high-precision testing of the perpendicularity of parts. When using it, you only need to attach the front end of the gauge body to the surface of the part to be tested to start the test. During the test, the average value of the two test values ​​at the 0° position (i.e., the initial position of the gauge) and the 180° position (i.e., the position after the gauge has rotated 180° around its center line from the initial position) is recorded as the perpendicularity of the two surfaces of the part. This eliminates the influence of the gauge's own precision error on the test results, and the testing precision and accuracy are high.

[0014] (3) The magnetic right-angle gauge for perpendicularity testing of this utility model is flexible in application. For different parts to be tested, gauge bodies with different precision and different lengths can be designed to adapt to various testing precision requirements in different testing environments. Attached Figure Description

[0015] Figure 1 This is a front view of the fixture in the embodiment;

[0016] Figure 2 for Figure 1 DD section view;

[0017] Figure 3 for Figure 2 Enlarged view at point E in the middle;

[0018] Figure 4 This is a schematic diagram of the detection status of the gauge in the embodiment;

[0019] The specific reference numerals in the figure are as follows:

[0020] 1-Inspection fixture body, 11-Counterhead, 12-Front side, 13-Rear side, 14-Cylindrical hole, 15-Transition hole, 16-First gap, 17-Second gap, 18-Third gap, 19-Upper busbar, 2-Strong magnetic block, 21-Narrow diameter section, 22-Wide diameter section, 3-Auxiliary plate, 4-Flange, 41-Glue-filling hole, 5-Guide rail, 6-Dial indicator, 7-Reference block. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] The magnetic right-angle gauge for perpendicularity testing in the embodiment, such as Figures 1-3 As shown, the fixture includes a cylindrical fixture body 1 made of GCr15 bearing steel. A strong magnetic block 2 is embedded in the fixture body 1. An auxiliary plate 3 is magnetically attracted to the front end of the strong magnetic block 2. A countersunk hole 11 is provided at the front end of the fixture body 1, and the auxiliary plate 3 is located in the countersunk hole 11.

[0023] In this embodiment, the length of the fixture body 1 is 150mm and the diameter is 30mm. The cylindricity of the outer circular surface of the fixture body 1 is 0.002~0.003mm and the roughness is within Ra0.4. The flatness and perpendicularity of the front side 12 and the rear side 13 of the fixture body 1 are 0.002~0.003mm and the roughness is within Ra0.4 respectively. The auxiliary plate 3 is made of 1.5mm thick cold-rolled steel plate.

[0024] In this embodiment, a cylindrical hole 14 is provided in the body of the gauge, and the front end of the cylindrical hole 14 is open. A flange portion 4 with a diameter of 60 mm and a length of 30 mm is integrally provided at the front end of the gauge body 1. The cylindrical hole 14 extends to the flange portion 4. A strong magnetic block 2 is embedded and installed at the front end of the cylindrical hole 14. A countersunk hole 11 is provided at the front end of the flange portion 4.

[0025] In this embodiment, the powerful magnetic block 2 is fixed to the front end of the cylindrical hole 14 with strong adhesive. Specifically, a transition hole 15 is provided between the cylindrical hole 14 and the countersunk hole 11. The powerful magnetic block 2 includes a narrow diameter section 21 and a wide diameter section 22 integrally formed at the front and rear. The narrow diameter section 21 is located inside the cylindrical hole 14, and the wide diameter section 22 is located inside the transition hole 15. There is an annular first gap 16 (0.1 mm on one side) between the outer circular surface of the narrow diameter section 21 and the inner surface of the cylindrical hole 14. The wide diameter section 22... There is an annular second gap 17 (1 mm on one side) between the outer circular surface and the inner surface of the transition hole 15. There is a third gap 18 (1 mm wide) between the front side of the wide diameter section 22 and the rear side of the auxiliary plate 3. The first gap 16 and the third gap 18 are respectively connected to the second gap 17. The upper radial side wall of the flange 4 is provided with a glue-filling hole 41, which is connected to the second gap 17. Strong glue is filled into the second gap 17 and the third gap 18 through the glue-filling hole 41. Before applying the adhesive, the narrow section of the strong magnetic block 2 is first sunk into the cylindrical hole 14. Then, the auxiliary plate 3 is attached to the countersunk hole 11 at the front end of the fixture body 1. The auxiliary plate 3 is held tightly to the fixture body 1 by the magnetic force of the strong magnetic block 2, without the need for additional pressing. Finally, a glue tube is connected to the glue-applying hole 41, and strong adhesive is applied to the glue-applying hole 41 through the glue tube. During the application, the first gap 16 vents the gas in the glue-applying hole 41, the second gap 17, and the third gap 18 into the cylindrical hole 14 inside the fixture body 1, effectively preventing the adhesive from overflowing upwards. The adhesive fills the second gap 17 and the third gap 18. After the adhesive solidifies, the glue tube is removed. The entire glue-applying process has no impact on the accuracy of the fixture body 1.

[0026] like Figure 4 As shown, taking the perpendicularity of the side surface of a guide rail 5 of a certain part to the top surface as an example, the perpendicularity is measured using the above-mentioned right-angle gauge. The steps are as follows:

[0027] 1) Hand-held right-angle gauge, adsorb the front side of flange part 4 to the side of guide rail 5, take the position of gauge at this time as initial position, i.e. 0° position, and take the upper generatrix 19 of gauge body 1 at this time as reference line;

[0028] 2) Adsorb micrometer 6 to reference block 7, and place reference block 7 on the top surface of guide rail 5;

[0029] 3) Move reference block 7, measure the two ends of upper generatrix 19 of gauge body 1 at 0° position by micrometer 6 respectively, record the value change of micrometer 6, and mark as A;

[0030] 4) Rotate the gauge 180° around the center line from 0° position to 180° position, then move reference block 7, measure the two ends of upper generatrix 19 of gauge body 1 at 180° position by micrometer 6 respectively, record the value change of micrometer 6, and mark as B;

[0031] 5) Calculate the perpendicularity of side surface and top surface of guide rail 5 as (A+B) / 2, which eliminates the influence of precision error of gauge itself on the detection result;

[0032] 6) Calculate the size of ((A+B) / 2) / 150×C, which is the actual perpendicularity of side surface and top surface of guide rail 5, wherein C is the adsorbing length. If the length of the measured section is less than the diameter of flange part 4 (i.e. 60mm), the adsorbing length is the actual length, i.e. Figure 4 the width of guide rail 5; if the length of the measured section is greater than the diameter of flange part 4, the adsorbing length takes a fixed value 60 (i.e. the diameter of flange part 4).

Claims

1. A magnetic right-angle gauge for perpendicularity testing, characterized in that, The utility model provides a kind of magnetic force gauge, including the cylindrical gauge body made of bearing steel, the strong magnetic block is embedded and installed in the gauge body, the front end of the strong magnetic block is magnetically attracted with auxiliary plate, the front end of the gauge body is provided with counterbore, and the auxiliary plate is located in the counterbore.

2. The magnetic right angle protractor according to claim 1, wherein The cylindricality of the outer cylindrical surface of the gauge body is 0.002-0.003mm, and the roughness is within Ra0.4, the flatness and perpendicularity of the front side and the back side of the gauge body are respectively 0.002-0.003mm, and the roughness is respectively within Ra0.

4.

3. The magnetic right angle protractor according to claim 1 or 2, wherein The cylindrical hole is provided in the gauge body, the front end of the cylindrical hole is opened, and the strong magnetic block is embedded and installed at the front end of the cylindrical hole.

4. The magnetic right angle prover for detecting perpendicularity according to claim 3, wherein The flange part is integrally arranged at the front end of the gauge body, the cylindrical hole extends to the flange part, and the counterbore is provided at the front end of the flange part.

5. The magnetic right angle prover for detecting perpendicularity according to claim 4, wherein The strong magnetic block is fixed at the front end of the cylindrical hole by strong glue.

6. The magnetic right angle prover for detecting perpendicularity according to claim 5, wherein The transition hole is connected between the cylindrical hole and the counterbore, the strong magnetic block includes front and rear integrally arranged narrow diameter section and wide diameter section, the narrow diameter section is located in the cylindrical hole, the wide diameter section is located in the transition hole, the outer cylindrical surface of the narrow diameter section and the inner surface of the cylindrical hole have annular first gap, the outer cylindrical surface of the wide diameter section and the inner surface of the transition hole have annular second gap, the front side of the wide diameter section and the back side of the auxiliary plate have third gap, the first gap and the third gap are communicated with the second gap respectively, the radial upper side wall of the flange part is provided with glue pouring hole, the glue pouring hole is communicated with the second gap, and the strong glue is filled into the second gap and the third gap through the glue pouring hole.

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