CN113432570A

CN113432570A - Measuring tool and measuring method for measuring dimple depth

Info

Publication number: CN113432570A
Application number: CN202110508320.8A
Authority: CN
Inventors: 幸锐; 高飞; 王伟; 邢欣; 张虎
Original assignee: AVIC Xian Aircraft Industry Group Co Ltd
Current assignee: AVIC Xian Aircraft Industry Group Co Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-09-24

Abstract

The invention discloses a measuring tool and a measuring method for measuring dimple depth. The three-jaw positioning sleeve and the special measuring head can be replaced according to the shape and the size of a rivet or bolt socket to be measured. During measurement, a corresponding calibration gauge is firstly used for zero setting to determine the standard socket depth, then a special measuring head is inserted into a prepared rivet or bolt socket, reading is carried out after the three-jaw locating sleeve is tightly pressed with the surface of the skin, and whether the socket depth can meet the process requirements is measured.

Description

Measuring tool and measuring method for measuring dimple depth

Technical Field

The invention relates to the technical field of aircraft dimple hole making measurement, in particular to a measuring tool and a measuring method suitable for measuring the depth of a dimple on the surface of an aircraft skin.

Background

In the aircraft full-aircraft pneumatic system, the aircraft surface quality is one of the most important factors in the system, and because the appearance of the whole aircraft is finally formed by riveting assembly, the countersunk fasteners such as aircraft rivets, bolt heads and the like have to meet a certain flush degree with the surface of the aircraft skin, and the flush degree is the height difference between the rivet heads and the bolt heads relative to the surrounding skin. In an aircraft assembly file, the flush degree of a countersunk head fastener and the surface of a skin is required to be higher, and the flush degree requirements of different fasteners, different shapes and different positions are different.

At present, the method for detecting the alignment flatness is that after a fastener is installed in a hole, the fastener is contacted with the surface of a skin by hand, whether the fastener is qualified or not is preliminarily judged by experience feeling, and more accurately, the alignment flatness is measured by a leveling gauge to determine whether the fastener is qualified or not, the steps are relatively complicated, and the use is inconvenient.

Aiming at the situation, a special measuring tool capable of quickly and accurately measuring the depth of the dimple on the surface of the aircraft skin is urgently needed to meet the use requirement of field detection.

Disclosure of Invention

In order to overcome the defects of inaccuracy, complex operation steps and the like of the existing detection method, the invention provides the special measuring tool and the measuring method suitable for measuring the depth of the dimple on the surface of the aircraft skin.

The utility model provides a measuring tool for measuring dimple degree of depth, including the digital display scale, the measuring stick, the three-jaw position sleeve, a spring, special gauge head, fastening bolt, measuring stick one end is equipped with the external screw thread of being connected with the digital display scale cooperation, other end top surface center is equipped with the internal thread blind hole with fastening bolt complex, the three-jaw position sleeve, the measuring stick is passed in proper order to the spring, three-jaw position sleeve and measuring stick external diameter clearance fit, and can follow the measuring stick and freely slide, special gauge head passes fastening bolt and fixes at the measuring stick end through fastening bolt. The special measuring head is consistent with the rivet arranged in the counter boring to be measured in shape, and the center of the special measuring head is provided with a through hole which can be in sliding fit with the outer diameter of the fastening bolt. The distance between the three claws of the three-claw positioning sleeve is larger than the socket diameter of the socket-sinking hole.

A measuring method for measuring dimple depth comprises the following steps:

1, processing a standard dimple hole with composite design requirements at the center of a cylindrical block with parallel upper and lower end surfaces;

2, when in measurement, firstly, a special measuring head on a measuring tool extends into the standard dimple hole, and after the three-jaw positioning sleeve is tightly pressed with the surface of the cylindrical block, the measured value displayed by the digital display scale is zeroed to determine the depth of the standard dimple;

and 3, extending a special measuring head of the measuring tool into the countersink hole of the rivet to be measured, reading after the three-jaw positioning sleeve is tightly pressed with the surface of the skin, and measuring whether the difference value between the actual pit depth and the standard pit depth is within the tolerance range.

The invention adopts the digital display scale to measure, so that the measurement reading is accurate, the sensitivity is high, meanwhile, the three-jaw positioning sleeve, the special measuring head and the calibration ring can be replaced according to the shape and the size of the fastener to be measured, the application range is extremely wide, the operation is convenient, the detection difficulty of the product is reduced, and the measurement data is stable and reliable.

This application is described in further detail below with reference to the example drawings.

Drawings

FIG. 1 is a view showing a structure of a measuring tool

FIG. 2 is a schematic diagram of the use of a special measuring tool

The numbering in the figures illustrates: 1. digital display scale; 2. a measuring rod; 3. a three-jaw positioning sleeve; 4. a spring; 5. a special measuring head; 6. fastening a bolt; 7. and (5) reaming a socket hole.

Detailed Description

As shown in fig. 1-2, a measuring tool for measuring dimple depth comprises a digital display scale 1, a measuring rod 2, a three-jaw positioning sleeve 3, a spring 4, a special measuring head 5 and a fastening bolt 6, wherein the main body of the digital display scale 1 is of a circular structure, a display screen is arranged in the center of the main body and used for displaying a measured value, three control keys are arranged below the display screen and respectively are MODE, SET and DATA, and are used for carrying out MODE, presetting, switching and other controls, and the digital display scale can select specific models, measuring ranges, precision and the like according to the precision required by actual measurement. 2 one ends of measuring stick are equipped with the external screw thread of being connected with the cooperation of digital display scale 1, and other end top surface center is equipped with the internal thread blind hole with fastening bolt 6 complex, and three-jaw position sleeve 3, spring 4 pass measuring stick 2 in proper order, and three-

jaw position sleeve

3 and 2 external diameter clearance fit of measuring stick to can follow measuring stick 2 and freely slide, special gauge head 5 passes fastening bolt 6 and fixes at 2 ends of measuring stick through fastening bolt 6. The special measuring head 5 is consistent with the rivet arranged in the counter boring to be measured in shape, and the center of the special measuring head is provided with a through hole which can be in sliding fit with the outer diameter of the fastening bolt 6. The distance between three claws of the three-claw positioning sleeve 3 is larger than the socket diameter of the socket hole 7, the three-claw positioning sleeve is used for being positioned on the surface of the skin near the socket to be measured, and the measurement condition can be observed through the gap between the three claws during use. When the special measuring head 5 is replaced, the three-jaw positioning sleeve 3 does not need to be replaced within a certain range, and the size needs to be changed when the diameter is smaller than that of the special measuring head 5. The spring 4 below the three-jaw positioning sleeve 3 is used for adjusting the distance between the three-jaw positioning sleeve and a special measuring head, and the three-jaw positioning sleeve 3 is prevented from moving up and down.

When the tool is used, in the first step, a standard socket hole meeting the design requirement is machined in the center of a cylindrical block with the upper end surface and the lower end surface parallel to each other.

And secondly, when in measurement, firstly, the special measuring head 5 on the measuring tool extends into the standard dimple hole, and after the three-jaw positioning sleeve 3 is tightly pressed with the surface of the cylindrical block, the measured value displayed by the digital display scale 1 is zeroed to determine the depth of the standard dimple.

Thirdly, a special measuring head 5 of the measuring tool extends into a rivet countersink hole 7 to be measured, reading is carried out after the three-jaw positioning sleeve 3 is tightly pressed with the surface of the skin, and whether the difference value of the actual socket depth and the standard socket depth is within the tolerance range is measured. Reading the display screen of the digital display scale 1, wherein if the reading is 0 or within the tolerance, the pit depth just meets the process requirement; if the reading is negative and exceeds the tolerance range, the depth of the fossa is too shallow; if the reading is positive and exceeds the tolerance range, the pit depth is too deep and does not meet the process requirement.

If other standard fasteners need to be measured, only the three-jaw positioning sleeve 3 and the special measuring head 5 need to be replaced correspondingly, and the steps are repeated.

Claims

1. The utility model provides a measuring tool for measuring dimple degree of depth, its characterized in that includes the digital display scale, the measuring stick, the three-jaw position sleeve, a spring, special gauge head, fastening bolt, measuring stick one end is equipped with the external screw thread of being connected with the digital display scale cooperation, other end top surface center be equipped with fastening bolt complex internal thread blind hole, the three-jaw position sleeve, the measuring stick is passed in proper order to the spring, three-jaw position sleeve and measuring stick external diameter clearance fit, and can follow the measuring stick and freely slide, special gauge head passes fastening bolt and fixes at the measuring stick end through fastening bolt.

2. The special measuring tool for measuring the depth of the countersink as claimed in claim 1, wherein the special measuring head is consistent with the shape of a rivet installed in the countersink to be measured, and a through hole capable of being in sliding fit with the outer diameter of the fastening bolt is formed in the center of the special measuring head.

3. The measuring tool for measuring the depth of the countersink as claimed in claim 1, wherein the distance between the three claws of the three-claw locating sleeve is greater than the diameter of the countersink hole.

4. A measuring method for measuring the depth of a dimple is characterized by comprising the following steps:

4-1, processing a standard socket hole with composite design requirements in the center of a cylindrical block with parallel upper and lower end surfaces;

4-2, when in measurement, firstly, a special measuring head on a measuring tool extends into the standard dimple hole, and after the three-jaw positioning sleeve is tightly pressed with the surface of the cylindrical block, the measured value displayed by the digital display scale is zeroed to determine the depth of the standard dimple;

4-3, extending a special measuring head of the measuring tool into the rivet countersink hole to be measured, reading after the three-jaw positioning sleeve is tightly pressed with the surface of the skin, and measuring whether the difference value of the actual socket depth and the standard socket depth is within the tolerance range.