A trench depth measuring tool

Abstract

This utility model discloses a groove depth measuring tool, including a base plate. Probe I and probe II are respectively provided at both ends of the base plate. Probe I and probe II are plate-shaped structures and are parallel to each other. The two sides of probe I are perpendicular to the end face of the base plate, and the two sides of probe II are also perpendicular to the end face of the base plate. This utility model has a simple structure and low cost. It utilizes the light transmission criterion and the principle of pass / stop, making it easy to operate and disassemble, and providing good measurement results. This utility model has good versatility: no matter how complex the part is, as long as the hole can be placed in the measuring tool, the part can be measured. This utility model also has the advantages of high measurement efficiency and good flexibility.

Description

Technical Field

[0001] This utility model belongs to the field of measuring instrument technology, specifically relating to a groove depth measuring instrument. Background Technology

[0002] The curved parts of an aero-engine are one of the core components of the engine's hot section, such as... Figure 1-2 As shown, precision annular grooves are typically formed on the end face of turbine blades. These grooves are mainly used to install the blade crown sealing rings or honeycomb sealing structures, which are crucial for sealing the air passage, ensuring turbine efficiency, and preventing blade scratches. Therefore, end face grooves are key components that ensure engine performance and safety. In engine manufacturing and maintenance, accurately and efficiently measuring the groove depth of the end face sealing grooves on arc-shaped parts is an important inspection task.

[0003] However, in practical applications, there are many difficulties in measuring groove depth: (1) General methods (calipers, micrometers) are not suitable. Due to size limitations, the width of the end face groove is narrow and difficult to penetrate deeply; it is very difficult to accurately align the axis with the groove depth direction, especially when operating inside the groove structure, which will introduce alignment errors. (2) The feeler gauge measurement method also has defects when used for groove depth measurement. The operator inserts the feeler gauge into the bottom of the groove, draws a line on the flush plane, and then takes it out to measure the drawn line size, which is the groove depth size. This method is inefficient, inaccurate, cannot guarantee verticality, and is greatly affected by the operator's subjective experience and reading errors. (3) The space of the sealed groove is narrow, making operation difficult. The bottom of the groove is arc-shaped, and general probes cannot accurately reach the lowest point. (4) Coordinate measuring machines are costly and have strict environmental requirements. They cannot be directly measured on the processing equipment, and the efficiency is too low. At present, there is a lack of a measuring tool that is low in cost, easy to operate, highly adaptable (especially adaptable to the characteristics of the groove structure), reliable in accuracy, good repeatability, high efficiency, and can be quickly measured on the machine tool for this structure. This severely restricts production efficiency, slows down maintenance turnaround times, and makes it difficult to achieve timely product quality control. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a groove depth measuring tool that is simple in structure, low in cost, easy to operate, reliable in accuracy, good in repeatability, high in efficiency, and can be quickly measured on a machine tool.

[0005] The technical solution adopted in this utility model is:

[0006] A groove depth measuring tool includes a base plate, with probe I and probe II respectively provided at both ends of the base plate. Probe I and probe II are plate-shaped structures and are parallel to each other. The two sides of probe I are perpendicular to the end face of the base plate, and the two sides of probe II are perpendicular to the end face of the base plate.

[0007] Furthermore, on the end face of the substrate where probe I is located, a root cleaning groove I is provided at the root of probe I; on the end face of the substrate where probe II is located, a root cleaning groove II is provided at the root of probe II.

[0008] Furthermore, the surface roughness of both sides of probe I is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe I to the end face of probe I on the substrate is ≤0.01mm.

[0009] Furthermore, the surface roughness of both sides of probe II is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe II to the end face of probe II on the substrate is ≤0.01mm.

[0010] Furthermore, the substrate has a through hole in the middle for threading a wire through for fixing and preventing loss.

[0011] Furthermore, the substrate, probe I, and probe II are an integral structure, and the hardness of the substrate, probe I, and probe II is ≥55HRC.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) This utility model has a simple structure and low cost. It uses the light transmission criterion and the principle of pass / stop, and is easy to operate and disassemble, and has good measurement results.

[0014] (2) Good versatility. No matter how complex the part is, as long as the hole can be placed in the measuring tool, the part can be measured.

[0015] (3) High measurement efficiency and good flexibility. Measurement is not limited by spatial position. The manual insertion of the measuring instrument into the hole and its fit with the part can quickly determine whether it is qualified. There is no need to wait time or ensure that the part is perpendicular.

[0016] (4) High accuracy. The relative positions of the plane are intuitive and easy to judge, and errors are less likely to occur. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the part used for testing according to this utility model.

[0018] Figure 2 yes Figure 1 The K-direction view in the image.

[0019] Figure 3 This is the front view of this utility model.

[0020] Figure 4 This is the left view of this utility model.

[0021] Figure 5 This is a diagram showing the positional relationship between the probe I and the groove of the part when this utility model is in use.

[0022] Figure 6 This is a diagram showing the positional relationship between probe II and another groove on the part when this utility model is in use. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 3-4 As shown, this utility model includes a substrate 1. Probe I2 and probe II3 are respectively provided at both ends of the substrate 1. On the end face of the substrate 1 where probe I2 is located, a root cleaning groove I5 is provided at the root of probe I2; this effectively avoids interference problems when probe I2 enters the support surface at the bottom of the groove during measurement. On the end face of the substrate 1 where probe II3 is located, a root cleaning groove II6 is provided at the root of probe II3; this effectively avoids interference problems when probe II3 enters the support surface at the bottom of the groove during measurement. Probe I2 and probe II3 are both plate-shaped structures and are parallel. A through hole 4 is provided in the middle of the substrate 1 for threading a wire for fixation and preventing loss. The ends of probe I2 and probe II3 are cylindrical surfaces. The radius R of the cylindrical surface is designed according to the arc dimension of the bottom of the groove to ensure that probe I2 and probe II3 can effectively detect the lowest point of the bottom of the groove.

[0025] Both sides of probe I2 and probe II3 are perpendicular to the end face of the substrate. The surface roughness of the two sides of probe I2 is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe I2 to the end face of substrate 1 where probe I2 is mounted is ≤0.01mm. The surface roughness of the two sides of probe II3 is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe II3 to the end face of substrate 1 where probe II3 is mounted is ≤0.01mm. Substrate 1, probe I2, and probe II3 are an integral structure, and the hardness of substrate 1, probe I2, and probe II3 is not less than 55HRC. After manufacturing, laser marking is applied to the plane of substrate 1, marking the large end, small end, and drawing number, with a character height of 5mm, for quick identification by operators. The substrate 1 is stored in a plastic box to prevent damage.

[0026] The design principle of this utility model is as follows: Assuming the groove depth of the part is 3.0–3.2 mm and the bottom radius R is 0.3 mm; considering safety margin, the gauge design range is 3.01–3.19 mm. The design dimensions of the two probes are: Probe I2 length: K ± 0.06 mm: designed as 3.19 ± 0.06 mm; Probe II3 length: H ± 0.06 mm: designed as 3.01 ± 0.06 mm.

[0027] The measurement method of this utility model is as follows: Insert probe I2 and probe II3 into the inner groove of the part, ensuring that probe I2 and probe II3 are in contact with the bottom end of the groove. Figure 5-6As shown, when there is a gap between the end face of the probe I2 on the substrate 1 and the reference surface of the part (light transmission is visible when inspected by light transmission), and at the same time, there is no gap between the end face of the probe II3 on ​​the substrate 1 and the reference surface of the part (light transmission is not visible when inspected by light transmission), that is, the groove depth of the part is within the tolerance range and the groove depth is qualified; otherwise, it is unqualified.

Claims

1. A groove depth measuring tool, characterized in that: The substrate includes a base plate, with probe I and probe II respectively at both ends. Probe I and probe II are plate-shaped structures and are parallel to each other. The two sides of probe I are perpendicular to the end face of the base plate, and the two sides of probe II are perpendicular to the end face of the base plate.

2. The trench depth measuring tool according to claim 1, characterized in that: On the end face of the substrate with probe I, a root cleaning groove I is provided at the root of probe I; on the end face of the substrate with probe II, a root cleaning groove II is provided at the root of probe II.

3. The trench depth measuring tool according to claim 1, characterized in that: The surface roughness of both sides of probe I is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe I to the end face of probe I on the substrate is ≤0.01mm.

4. The trench depth measuring tool according to claim 3, characterized in that: The surface roughness of both sides of probe II is Ra0.8μm, and the parallelism of the two sides is ≤0.01mm; the perpendicularity of the two sides of probe II to the end face of the substrate on which probe II is mounted is ≤0.01mm.

5. The trench depth measuring tool according to claim 1, characterized in that: The substrate has a through hole in the middle.

6. The trench depth measuring tool according to claim 1, characterized in that: The substrate, probe I, and probe II are integrated into one structure, and the hardness of the substrate, probe I, and probe II is ≥55HRC.

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