CN106767320A - A detection tool for quickly and accurately detecting the depth size of pit defects in parts - Google Patents

Abstract

The invention discloses a detection tool for quickly and accurately detecting the depth size of a part pit defect, which belongs to the field of detection tools and includes a dial indicator, a measuring tube and a measuring probe. The dial indicator is connected to the tail of the measuring probe. The main body of the measuring probe is located in the measuring tube, the head of the measuring probe is tapered, the upper part of the measuring tube is provided with a threaded hole and a locking screw matched with the threaded hole, and the lower part of the measuring tube is provided with a support Legs; the detection tool of the present invention can effectively carry out rapid and accurate detection, is simple to operate, has good versatility, improves the detection efficiency of parts by more than 50%, and improves the detection accuracy by 5 times, making the judgment of products easier, and can replace Traditional detection methods, such as the detection of the depth size of such pit defects by the bow frame.

Description

A detection tool for quickly and accurately detecting the depth size of pit defects in parts

technical field

The invention relates to the field of detection tools, in particular to a detection tool for quickly and accurately detecting the depth size of pit defects in parts.

Background technique

All kinds of parts in aerospace and related industries are prone to various pit defects during the processing process. In the process of production and acceptance, the depth of such pit defects often determines the final qualification of the product, so it is very important .

Especially when detecting the depth of pit defects on large parts, the accuracy of measurement is particularly critical. Therefore, there has been no good solution to the problems of large measurement errors and limited range of defect detection equipment in the middle of large parts.

In actual production, the combination of bow frame and dial indicator is often used for detection at present. Due to the limited structure, specification and measuring range of the bow frame, the span of the bow frame is 500mm, and the edge distance is greater than 500mm, which cannot be detected, especially for large wall panels. , melon petals, top cover, and the depth of pit defects in the middle of the skin lead to low detection accuracy and are not easy to operate. The average value can only be obtained through multiple measurements, with large errors and low efficiency. In addition, pit defects have the characteristics of different shapes and sizes. The pits may be hemispherical, inverted conical, stepped, triangular, or irregular. The bottom of the defect and the mouth are different in diameter, shape, and size. Ultrasonic thickness gauges cannot detect due to the diameter of the probe and other reasons. The detection accuracy of pit defects greater than 500mm from the edge is low, and there has been no good detection method.

Use a pointed micrometer to detect the depth of the pit defect near the edge of the part. When the pit defect is at the center of the part, it is often necessary to change different measurement tools. When facing a pit near the middle of a large part of several meters When there is a defect, it cannot be detected.

Using other methods of approximation can not always get accurate measurement values, which brings great difficulty to the judgment of product quality, and has been looking for a good detection method.

Contents of the invention

The object of the present invention is to provide a detection tool for quickly and accurately detecting the depth size of pit defects in parts, so as to solve the above problems.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: a detection tool for quickly and accurately detecting the depth size of a part pit defect, including a dial indicator, a measuring tube and a measuring probe, the dial indicator and the measuring The tail of the probe is connected, the main body of the measuring probe is located in the measuring tube, the head of the measuring probe is tapered, the upper part of the measuring tube is provided with a threaded hole and a locking screw matched with the threaded hole, the measuring The lower part of the tube is provided with support legs.

As a preferred technical solution: there are two measuring probes, one of which is similar to a "Z" shape. One of them is in the shape of a straight rod, which is used for routine inspection, and a "Z"-shaped measuring probe can be used to measure pit defects with narrow cavities or interference parts. The "Z" shape mentioned above refers to a total of three sections including the vertical section, the horizontal section and the head, and the first part is connected. The other end of the segment is about 90° to the horizontal segment, and the vertical segment and the head are on different sides of the horizontal segment.

As an optimal technical solution: the dial indicator is screwed to the tail of the measuring probe, which is convenient for installation, disassembly and storage.

As a preferred technical solution: the number of the supporting legs is three or four.

The use method of the tooling of the present invention is the same as that of the dial indicator. First, adjust the length of the triangular or quadrangular support legs of the measuring probe to make it slightly larger than the depth of the pit defect and meet the maximum range of the dial indicator. Find the change at the position where there is no defect next to the pit defect, and then move the dial indicator to the defect position for measurement and reading. When measuring pit defects on arcuate, spherical, and elliptical surfaces, the position of the supporting legs should be consistent with the change position. The Z-shaped measuring head is used to measure pit defects with narrow cavity or interference parts.

Compared with the prior art, the present invention has the advantages of:

1. Improve the detection accuracy: the detection tool is combined with the dial gauge to reduce the detection error and improve the detection accuracy. The detection accuracy can reach 0.01mm, which is 5 times higher than the existing detection accuracy of 0.05. ;

2. Improved detection efficiency: single-person operation (two people are required to operate when using a larger bow-shaped frame), and the detection is completed at one time. There is no need to remove the influence of the gravity of the bow-shaped frame on the measured value on the dial indicator during the measurement, and the detection efficiency is increased by 50. %above;

3. Wide range of application: It is suitable for the detection of the depth and size of pit defects in various parts, and has good versatility.

4. Low manufacturing cost of measuring tools: ordinary tool steel, less material consumption and ingenious structure;

Using this combination detection tool can effectively carry out rapid and accurate detection, simple operation, good versatility, improves the efficiency and accuracy of part detection, makes product judgment easier, and can replace traditional detection methods, such as bow frame Detection of the depth dimension of such pit defects.

Description of drawings

Fig. 1 is the structural representation of measuring tube;

Fig. 2 is a three-dimensional structural diagram of the measuring tube;

Fig. 3 is the structural representation of wherein a kind of measuring probe;

Fig. 4 is the structural representation of another kind of measuring probe;

Fig. 5 is a schematic diagram of assembly of the tooling of the present invention.

In Fig. 5: 1, dial indicator; 2, locking screw; 3, measuring tube; 4, measuring probe.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

Example:

A detection tool for quickly and accurately detecting the depth of pit defects in parts. Its assembly structure is shown in Figure 5, including a dial indicator 1, a measuring tube 3, and a measuring probe 4. The tail of the dial indicator 1 and the measuring probe 4 is threaded. , the main body of the measuring probe 4 is located in the measuring tube 3, the head of the measuring probe 4 is tapered, the upper part of the measuring tube 3 is provided with a threaded hole and a locking screw 2 cooperating with the threaded hole, and the lower part of the measuring tube 3 is provided with Supporting legs, the number of the supporting legs is three (in the case of three supporting legs in Figs. Rod shape, as shown in Figure 3, another measuring probe 4 is similar to a "Z" shape, and its structure is shown in Figure 4, which includes a vertical section, a horizontal section and a head, a total of three sections, the first connected , wherein, the vertical section and the horizontal section are at about 90°, the head is at the other end of the horizontal section and the horizontal section is at about 90°, and the vertical section and the head are on different sides of the horizontal section.

The manufacturing method of the frock of the present embodiment is:

The measuring tube 3 is processed into a circular tube with an outer diameter of Ф12×60 mm, the inner hole is a stepped hole, the inner diameter of the upper part is Ф8.2 mm×20 mm, and the inner diameter of the lower part is Ф10 mm×40 mm; at a distance of 10 mm from the upper port A threaded through hole of M3 is processed, and a triangular support leg is processed at the lower part. The size of the leg surface is 1 mm×1 mm, and the height of the triangular opening is 18 mm; the total length of the locking screw 2 with cap is 10 mm, and the external thread is M3. The size of the edge is 3 mm×φ8, and the outer surface is knurled; the size of the measuring probe is Ф5×35 mm, and the length of the cone surface of the head is 20 mm. Thread (the size of the M3 external thread can be determined according to the specific size of the connection between the dial gauge measuring head and the meter stem), the large diameter Ф5 outer surface is knurled (see the figure below for the Z-shaped measuring head, and can be adjusted according to the actual situation), the material is Commonly used tool steel (T8A) and quenched, the outer diameter and length of the measuring tube and the length of the measuring probe 4 can be adjusted according to the size and depth of the pit defect, and different specifications of the measuring tube 3 and measuring probe 4 can be processed to facilitate detection.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (4)

1. A detection tool for quickly and accurately detecting the depth of a pit defect in a part, characterized in that it includes a dial indicator, a measuring tube and a measuring probe, the dial indicator is connected to the tail of the measuring probe, and the measuring probe The main body is located in the measuring tube, the head of the measuring probe is tapered, the upper part of the measuring tube is provided with a threaded hole and a locking screw matched with the threaded hole, and the lower part of the measuring tube is provided with a supporting leg. 2. The detection tool for quickly and accurately detecting the depth of pit defects in parts according to claim 1, characterized in that: there are two measuring probes, one of which is in the shape of a "Z" shape. 3. The detection tool for quickly and accurately detecting the depth of pit defects in parts according to claim 1, wherein the dial indicator is screwed to the tail of the measuring probe. 4. The inspection tool for quickly and accurately inspecting the depth of pit defects in parts according to claim 1, characterized in that: the number of the supporting legs is three or four.