Precise hole measuring tool

Abstract

The invention relates to the technical field of precision hole measuring methods in the field of machine manufacturing, in particular to a precision hole measuring tool which comprises a base, an upper cover, a fixed measuring head, a movable measuring head, a trigger and a mounting seat. A through hole in the vertical direction is formed in the middle of the base, and the trigger is installed through a rotating shaft. The bottom of the upper cover is provided with a through groove along the length direction and is provided with a movable probe. The mounting seat is assembled in the mounting hole of the upper cover in an interference manner; the fixed measuring head is mounted on the vertical plate of the base; the middle part of the movable measuring head is connected with the upper cover through a cylindrical pin B; the rear end is a touch end and is linked with a trigger; a clamping groove is formed in the upper surface of the middle rear portion to fix the bottom of a cylindrical compression spring, and the top of the cylindrical compression spring is installed on the upper cover through a sunk screw B. When in use, the high-precision reading characteristic of the dial gauge is combined with a comparative measurement method, and relative measurement, online real-time measurement and feedback are realized through calibration of the standard ring gauge, so that the qualified rate of products is greatly increased, and the production efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the technical field of precision hole measurement methods in the machinery manufacturing industry, and specifically to a precision hole measurement tool. Background Technology

[0002] In fields such as mechanical manufacturing, aerospace, and automotive, the machining accuracy of hole-type parts is crucial, directly affecting the assembly quality, service life, and overall performance of the product. Therefore, accurate measurement of dimensions such as hole diameter is an indispensable part of the production process.

[0003] Currently, the commonly used hole measurement methods in the industry mainly include a series of contact measuring tools such as inside micrometers, plug gauges, and coordinate measuring machines (CMMs). While inside micrometers are simple in structure and inexpensive, they have limitations in measuring deep holes and are not suitable for batch measurements. Plug gauges can quickly determine whether a hole diameter is acceptable, but this is a qualitative measurement and cannot obtain specific dimensional values; they are also unsuitable for blind hole measurements. Coordinate measuring machines (CMMs) are powerful and can measure a variety of parameters, but their measurement speed is slow, they have extremely high environmental requirements, are expensive, and are difficult to integrate into production lines for online measurement.

[0004] In addition, in the fields of precision machinery and aerospace, the accuracy of hole machining directly affects the performance and service life of products. The demand for precision in precision hole machining is constantly increasing, and traditional measurement methods are no longer sufficient to meet the measurement requirements at the micron level. Insufficient online measurement technology leads to low production efficiency; on the other hand, existing high-precision measuring instruments are expensive. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a precision hole measuring tool.

[0006] The specific technical solution is as follows: A precision bore measuring tool includes a base, a top cover, a fixed probe, a movable probe, a trigger, and a mounting base. The base has an L-shaped bend at the front end with a vertical plate and a horizontal plate, and a handle at the rear end. A vertical through hole is formed in the middle, through which the trigger is mounted via a rotating shaft. The top cover is inverted T-shaped, with a mounting hole vertically downwards on the top surface and a through groove along the length of the bottom, within which the movable probe is mounted. The mounting base is hollow, with an external thread at one end and multiple longitudinal expansion joints, a flange in the middle, and an interference fit at the other end into the mounting hole of the top cover. The fixed probe is L-shaped, vertically... The straight section has a waist hole and is mounted on the vertical plate of the base by a cylindrical head screw A; the middle of the moving probe is connected to the top cover by a cylindrical pin B; the rear end is the trigger end, which is linked to the trigger; a groove is opened on the upper surface of the middle and rear section to fix the bottom of the cylindrical compression spring, and the top of the cylindrical compression spring is mounted on the top cover by a countersunk screw B; it also includes a lever dial indicator and a ring gauge, the measuring rod of the lever dial indicator is inserted from the mounting base and abuts against the trigger end, and is locked by a lock nut and external thread to restrict radial movement; the claws at the front ends of the fixed probe and the moving probe abut against the inner circle of the ring gauge.

[0007] The front ends of the fixed probe and the moving probe are equipped with claws that abut against the inner wall of the precision hole.

[0008] The base has two sides, A and B, respectively. The handle L and handle R are fixed to the handle side A and B respectively by a hexagonal nut and a cylindrical head screw B.

[0009] A small washer is added between the cylindrical head screw A and the fixed probe.

[0010] The precision hole includes a precision hole, a waist-shaped hole, or a deep hole.

[0011] The horizontal plate and the upper cover are positioned by cylindrical pin A and then fixed by countersunk screw A.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects: This invention relates to the field of precision machinery manufacturing and measurement, specifically a measuring tool for online, rapid, and high-precision measurement of the dimensions of hole-type parts. It features a simple structure, low cost, and the ability to quickly measure and provide dimensional feedback for precise holes. It can also be integrated into automated production lines for online measurement, avoiding errors caused by secondary clamping. By applying this novel measuring tool, rapid and accurate measurement of micron-level precision holes is achieved. The tool adapts to different hole depth measurement needs by changing the detection probe: a dedicated measuring mechanism is designed for special hole types (such as oblong holes and deep holes). For oblong precision holes, a rapid inspection fixture design is used, employing a high-precision detection probe (fixed) and a detection probe (moving). For deep hole measurement, a replaceable extended probe and a spring-loaded mechanism are designed for measurement. The detection probe is installed at an angle of less than 90° to the fastening screw hole to avoid interference problems during blind hole measurement. This allows it to adapt to the measurement needs of various precision holes with different diameters and depths, providing an effective and convenient inspection method for precision manufacturing.

[0013] When using the measuring tool of this invention, the high-precision reading characteristics of a dial indicator are combined with a comparative measurement method. Relative measurement is achieved through standard ring gauge calibration. After calibration, the testing head is inserted into the hole to be measured, and the positive and negative swing of the dial indicator is observed to analyze the dimensional readings and determine if the precision hole is qualified. Through online real-time measurement and feedback, the product qualification rate is significantly increased. Measurement time is reduced by more than 50% compared to traditional measurements, resulting in a substantial improvement in production efficiency. The manufacturing cost of the measuring device is only about 1 / 10 of that of traditional measuring equipment, saving manufacturing costs. It has been successfully applied to precision hole measurement scenarios in multiple fields such as precision machinery and aerospace. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the measuring tool of the present invention; Figure 2 This is an exploded view of the measuring tool of the present invention; Figure 3 This is the front view (side A) of the measuring tool of the present invention; Figure 4 for Figure 3 Sectional view of section AA; Figure 5 for Figure 3 Sectional view of section BB; Figure 6 for Figure 5 A sectional view of section C-C; Figure 7 This is a sectional view of the mounting base.

[0015] In the diagram, 1. Base; 101. Vertical plate; 102. Horizontal plate; 103. Handle; 104. Through hole; 2. Top cover; 201. Through groove; 3. Fixed probe; 4. Moving probe; 401. Slot; 402. Actuating end; 5. Trigger; 501. Shaft; 6. Mounting base; 601. External thread; 602. Telescopic port; 603. Flange; 7. Locking nut; 8. Handle L; 9. Handle R; 10. Cylindrical pin A; 11. Cylindrical pin B; 12. Hex nut; 13. Cylindrical head screw A; 14. Cylindrical head screw B; 15. Countersunk screw A; 16. Countersunk screw B; 17. Small washer; 18. Cylindrical compression spring. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited by the drawings.

[0017] Figure 1 This is a three-dimensional structural diagram of the measuring tool of the present invention. Figure 2 This is an exploded view of the measuring tool of the present invention. Figure 3 This is the front view (side A) of the measuring tool of the present invention. Figure 4 for Figure 3 Sectional view of section AA. Figure 5 for Figure 3 Sectional view of section BB. Figure 6 for Figure 5 Sectional view of section C-C. Figure 7 The figure shows a sectional view of the mounting base: This invention relates to a precision hole measuring tool, comprising a base 1, a top cover 2, a fixed measuring head 3, a movable measuring head 4, a trigger 5, a mounting base 6, and a locking nut 7. The base 1 has an L-shaped bend at its front end with a vertical plate 101 and a horizontal plate 102, and a handle 103 at its rear end. A vertical through hole 104 is located in the middle, through which the trigger 5 is mounted via a rotating shaft 501. The base 1 has two sides, A and B, respectively. The handle 103 has a handle L8 and a handle R9 fixed to its sides A and B respectively via a hexagonal nut 12 and a cylindrical head screw B14. The top cover 2 is inverted T-shaped, with a vertically downward mounting hole on its top surface and a through groove 201 along its length at its bottom, within which the movable measuring head 4 is mounted. The horizontal plate 102 is positioned to the top cover 2 via a cylindrical pin A10 and then secured by a countersunk screw A15. The mounting base 6 is hollow, with an external thread 601 at one end and multiple telescopic openings 602 longitudinally, and a flange 603 in the middle. The other end is interference-fitted into the mounting hole of the upper cover 2. The fixed probe 3 is L-shaped, with a waist hole on the vertical part. It is mounted on the vertical plate 101 of the base 1 by a cylindrical head screw A13. A small washer 17 is added between the cylindrical head screw A13 and the fixed probe 3. The middle part of the moving probe 4 is connected to the upper cover 2 by a cylindrical pin B11. The rear end is the trigger end 402, which is linked with the trigger 5. A groove 401 is opened on the upper surface of the middle and rear part to fix the bottom of the cylindrical compression spring 18. The top of the cylindrical compression spring 18 is mounted on the upper cover 2 by a countersunk screw B16. The front ends of the fixed probe 3 and the moving probe 4 have claws that abut against the inner wall of the precision hole. It also includes a lever dial indicator and a ring gauge. The lever dial indicator's measuring rod is inserted from the mounting base 6 and abuts against the contact end 402, and is locked by the locking nut 7 and the external thread 601 to restrict radial movement. The clasps at the front ends of the fixed measuring head 3 and the moving measuring head 4 abut against the inner circle of the ring gauge.

[0018] The aforementioned precision holes include precision holes, waist-shaped holes, or deep holes.

[0019] When using it, follow these steps: (1) Before formal measurement, the lever micrometer is calibrated with a standard ring gauge according to the standard hole diameter of the fine hole: the jaws at the front end of the fixed measuring head 3 and the moving measuring head 4 abut against the inner circle of the ring gauge, the measuring rod of the lever micrometer is inserted from the mounting base 6 and abuts against the contact end 402, and is locked by the locking nut 7 and the external thread 601 to restrict radial movement, and the lever micrometer is calibrated to the 0 position; (2) Then perform the formal measurement: Remove the standard ring gauge, insert the jaws at the front end of the fixed measuring head 3 and the moving measuring head 4 into the precision hole to be measured, pull the trigger 5, the jaws at the front end of the fixed measuring head 3 and the moving measuring head 4 abut against the inner wall of the precision hole, the contact end 402 drives the measuring rod of the lever micrometer to produce a reading, according to the reading of the lever micrometer that has been calibrated to 0, read the value of whether the diameter of the precision hole being measured is larger or smaller than the standard diameter; release the trigger 5, the cylindrical compression spring 18 drives the moving measuring head 4 to return to its position, and remove the measuring tool from the precision hole to be measured; (3) Based on the value that the diameter of the fine hole measured in step (2) is larger or smaller than the standard diameter, the fine hole is corrected to obtain the fine hole with the standard diameter.

Claims

1. A precision hole measuring tool, characterized in that: The device includes a base (1), a top cover (2), a fixed probe (3), a movable probe (4), a trigger (5), and a mounting base (6). The base (1) has an L-shaped bend at the front end with a vertical plate (101) and a horizontal plate (102), and a handle (103) at the rear end. A vertical through hole (104) is opened in the middle, and the trigger (5) is installed through a rotating shaft (501). The top cover (2) is inverted T-shaped, with a mounting hole vertically downward on the top surface and a through groove (201) along the length of the bottom. The movable probe (4) is installed in the through groove (201). The mounting base (6) is hollow, with an external thread (601) on one end and multiple telescopic openings (602) in the longitudinal direction. It has a flange (603) in the middle, and the other end is interference-fitted into the mounting hole of the top cover (2). The fixed probe (3) is... L-shaped, with a waist hole on the vertical part, and mounted on the vertical plate (101) of the base (1) by a cylindrical head screw A (13); the middle part of the moving probe (4) is connected to the upper cover (2) by a cylindrical pin B (11); the rear end is the trigger end (402), which is linked with the trigger (5); a slot (401) is opened on the upper surface of the middle and rear part to fix the bottom of the cylindrical compression spring (18), and the top of the cylindrical compression spring (18) is mounted on the upper cover (2) by a countersunk screw B (16); it also includes a lever micrometer and a ring gauge, the measuring rod of the lever micrometer is inserted from the mounting base (6) and abuts against the trigger end (402), and is locked by a locking nut (7) and an external thread (601) to restrict radial movement; the claws at the front ends of the fixed probe (3) and the moving probe (4) abut against the inner circle of the ring gauge.

2. The precision bore measuring tool according to claim 1, characterized in that: The front ends of the fixed probe (3) and the moving probe (4) are equipped with claws that abut against the inner wall of the precision hole.

3. The precision bore measuring tool according to claim 1, characterized in that: The base (1) has two sides, A and B, respectively. The handle (8) and handle (9) are fixed to the A and B sides of the handle (103) respectively by hexagonal nuts (12) and cylindrical head screws (14).

4. The precision bore measuring tool according to claim 1, characterized in that: A small washer (17) is added between the cylindrical head screw A (13) and the fixed probe (3).

5. The precision bore measuring tool according to claim 1, characterized in that: The precision hole includes a precision hole, a waist-shaped hole, or a deep hole.

6. The precision bore measuring tool according to claim 1, characterized in that: The horizontal plate (102) and the upper cover (2) are positioned by cylindrical pin A (10) and then fixed by countersunk screw A (15).

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