Wall thickness measuring tool for curved-surface thin-wall part

Abstract

The invention discloses a wall thickness measuring tool for a curved-surface thin-wall part, which comprises a body, a connecting shaft, an upper measuring foot, a measuring foot, a lever, a corner bracket, a spring, a gasket, a measuring head, a pin, a dial indicator, a screw and the like, in the design, the axis of the upper measuring foot and the axis of the lower measuring foot are positioned on the same axis, and the structural form of the body is determined by using an included angle between arc curvatures. Therefore, the measuring tool does not interfere with the part, and point-to-point wall thickness measurement of the curved surface of the part is realized. Through the measuring tool, the wall thicknesses of different positions of the curved surface part can be measured quickly and accurately, the measuring process is stable and controllable, the operation is simple, quick measurement can be realized, and the measuring efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of measuring device design, and in particular to a wall thickness measuring tool for curved surface thin-walled parts. Background Art

[0002] In the field of traditional parts manufacturing and processing, the wall thickness measurement of thin-walled parts usually uses a wall thickness gauge or a wall thickness micrometer. The wall thickness gauge uses the ultrasonic principle, and its measurement value stability is poor. It is not suitable for measuring parts with high wall thickness accuracy, and it requires high operator ability. The wall thickness micrometer is limited by its structure and has a small measurable range. It is not suitable for measuring the wall thickness of cylindrical or conical parts with a length greater than 10mm.

[0003] Prior art CN116558427B discloses a wall thickness measuring device and method for a cylindrical thin-walled part, which is measured by a laser sensor, and the wall thickness of the part is obtained by using the difference between the inner and outer wall distances measured by the sensor and the sensor. Prior art firstly requires measuring the angle between the generatrix and the axis or between the generatrix and the male vertical line of the measured cylindrical thin-walled part, secondly requires measuring the inner arm and the outer arm to be parallel to the generatrix where the measured point of the measured cylindrical thin-walled part is located, and thirdly, its structure is complex and involves many parts, and there are disadvantages that the device assembly and operation are too complicated during use. At the same time, this measuring device is only applicable to the wall thickness measurement of cylindrical or conical thin-walled parts, and has great limitations on the structure of the measured parts. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a wall thickness measuring tool for curved thin-walled parts, which is easy to operate, has high measurement accuracy, and has a controllable process and good stability.

[0005] The technical solution adopted by the present invention is a wall thickness measuring tool for curved thin-walled parts, including a main body, a measuring foot connected to a measuring needle to form a lower measuring foot, and the lower measuring foot is fixed to the main body through a fourth pin and a second screw; an upper measuring foot is connected to the main body through a measuring head, a spring and a gasket are installed inside the upper measuring foot, and the gasket and the measuring head are connected to the upper measuring foot through a third pin and a first pin respectively; a lever is connected to the main body through a second pin, and the front end fulcrum of the lever is connected to the end face of the measuring head, and the measuring head is driven to move up and down by pressing the lever, thereby driving the lower measuring foot to move; an angle bracket is fixed to the main body through a third screw, a dial indicator is connected to the angle bracket, and then the open end of the angle bracket is locked by the first screw.

[0006] Preferably, the axes of the measuring needle and the upper measuring foot are on the same center line, and the axis deviation is no more than φ0.05.

[0007] Preferably, the outer circular surface of the upper measuring foot and the inner hole surface of the body are required to have a roughness of Ra0.4 or above.

[0008] Preferably, the surface roughness of the ball head of the upper measuring foot and the surface roughness of the ball head of the measuring needle are required to reach Ra0.2 or above.

[0009] Preferably, the pin hole in the main body that cooperates with the lever is required to have a roughness of Ra0.8 or above.

[0010] Preferably, the pin hole of the lower measuring foot and the measuring needle adopt an interference fit.

[0011] Preferably, the surface of the upper measuring foot is designed with a smooth through groove of 10×1.5.

[0012] Preferably, the center distance between the pin hole of the lever and the front end boss is consistent with the center distance between the lever pin hole in the body and the inner hole of the upper measuring foot.

[0013] Preferably, the lower measuring foot and the body are connected by a pin and a nail, and the distance from the center of the inner hole of the upper measuring foot to the short end of the body is half the outer radius of the lower measuring foot.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a measuring tool for the wall thickness of a curved thin-walled part, the axis deviation of the upper and lower measuring feet is no more than φ0.05, and the structural form of the body is determined by using the angle between the arc curvatures, so that the measuring tool and the part do not interfere with each other, thereby realizing point-to-point wall thickness measurement of the curved surface of the part. This measurement method can quickly and accurately measure the wall thickness of different positions of the curved thin-walled part, and not only the measurement process is stable and controllable, but also the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an assembly diagram of the measuring tool of the present invention.

[0016] Figure 2 for Figure 1 AA direction view.

[0017] Figure 3 for Figure 1 A partial enlarged view of I.

[0018] Figure 4 for Figure 1 Partial enlarged view II.

[0019] Figure 5 This is a diagram showing an embodiment of measuring the wall thickness of the product of the present invention.

[0020] Figure 6 for Figure 5 Partial enlarged view III.

[0021] Markings in the figure: 1-main body, 2-lower measuring foot, 3-upper measuring foot, 4-angle bracket, 5-gasket, 6-lever, 7-measuring head, 8-first screw, 9-first pin, 10-spring, 11-measuring needle, 12-second screw, 13-second pin, 14-third pin, 15-fourth pin, 16-third screw. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] In view of the problems of poor stability of measured values, high requirements for operators and small measuring range in the existing wall thickness measurement technology of thin-walled parts, the present invention proposes a measuring tool for the wall thickness of curved thin-walled parts, comprising a body 1, a pin, an upper measuring foot 3, a lower measuring foot, a lever 6, an angle bracket 4, a spring 10, a gasket 5, a measuring head 7, a dial indicator and a screw. When in use, first calibrate the dial indicator, then press the trigger, and after determining the measuring position, release the trigger, and finally determine the wall thickness size according to the reading of the dial indicator. This measurement method is easy to operate, has high measurement accuracy, and is process controllable and stable, and is very suitable for front-line production sites.

[0024] See also Figure 1 The present invention provides the following technical solutions: A special-shaped curved surface wall thickness measuring tool, including a body 1, a lower measuring foot 2, an upper measuring foot 3, an angle bracket 4, a gasket 5, a lever 6, a measuring head 7, a first screw 8, a first pin 9, a spring 10, a measuring needle 11, a second screw 12, a second pin 13, a third pin 14, a fourth pin 15, a third screw 16 and other components. The measuring foot 2 and the measuring needle 11 are connected through a pin hole to form a lower measuring foot, and the lower measuring foot is fixed to the main body 1 through a fourth pin 15 and a second screw 12; the upper measuring foot 3 is connected to the main body 1 through a measuring head 7, and a spring 10 and a gasket 5 are installed inside the upper measuring foot 3, and the gasket 5 and the measuring head 7 are connected to the lower measuring foot 3 through a third pin 14 and a first pin 9 respectively; the lever 6 is connected to the main body 1 through a second pin 13, and the front end fulcrum of the lever 6 is connected to the end face on the measuring head 7, and the measuring head 7 is driven up and down by pressing the lever 6, thereby driving the lower measuring foot to move; the angle bracket 4 is fixed to the main body 1 through a third screw 16, and the dial indicator is connected to the angle bracket 4 through a positioning hole, and then the open end of the angle bracket 4 is locked by the first screw 8, and the dial indicator is fixed to the angle bracket 4, thereby completing the overall assembly of the measuring tool.

[0025] The working principle and use process of the present invention: In the design, the axis of the measuring needle 11 and the upper measuring foot 3 are on the same center line, and the axis deviation is not greater than φ0.05; the outer surface of the upper measuring foot 3 and the inner hole surface of the main body 1 are required to have a roughness of Ra0.4 or above to ensure that the upper measuring foot 3 can move flexibly in the main body 1; the ball head surface of the upper measuring foot 3 and the ball head surface of the measuring needle 11 are required to have a roughness of Ra0.2 or above to ensure the measurement accuracy; the pin hole in the main body 1 that cooperates with the lever 6 is required to have a roughness of Ra0.8 or above to ensure that the lever 6 can move freely in the pressed state movement; the pin hole of the measuring foot 2 and the measuring needle 11 adopt an interference fit, so that they become a whole after assembly; the surface of the upper measuring foot 3 is designed with a 10×1.5 smooth through groove to ensure that the measuring head 7 and the gasket 5 can move up and down freely; the center distance between the pin hole of the lever 6 and the front end boss is consistent with the center distance between the pin hole of the lever 6 in the body 1 and the inner hole of the upper measuring foot 3; the measuring foot 2 and the body 1 are connected by a pin and a nail, so that the measuring foot 2 is fixed on the body 1, and the distance from the center of the inner hole of the upper measuring foot 3 to the short end of the body 1 is half of the outer radius of the measuring foot 2.

[0026] like Figure 2 The main part of the product is a structure with the same shape inside and outside, which is composed of straight lines and multiple arcs. The wall thickness uniformity of each part is required to be high, and the allowable wall thickness deviation is ±0.05.

[0027] When in use, firstly adjust the dial indicator to "zero". Hold the end of the body 1 with your right hand, press the tail end of the lever 6 with your finger, so that the front end of the lever 6 drives the measuring head 7 to move upward, and the measuring head 7 drives the upper measuring foot 3 to move upward, so that there is a gap between the upper measuring foot 3 and the measuring needle 11. At this time, put in a micrometer pad (the thickness of the micrometer pad is selected according to the wall thickness), and then release the tail end of the lever 6 to restore the upper measuring foot 3 and the measuring needle 11 to their initial positions. At this time, adjust the dial indicator pointer to position "0", repeat the above steps 2 to 3 times, and observe the dial indicator pointer returning to "0"; secondly, press the tail end of the lever 6 to move the measuring head 7 upward, drive the gasket 5 and the spring 10 upward, when the lever 6 is pressed to the maximum extent, the spring 10 is in a relaxed state, and the upper measuring foot 3 is in a state of being ... 3 produces the maximum upward movement displacement. At this time, put the product into the measuring tool, so that the measuring part stays at the ball head tip of the measuring needle 11, and then slowly release the lever 6 to make the measuring head 7 move downward. When the ball head tip of the upper measuring foot 3 contacts the outer surface of the product, it stops moving downward, and then drives the measuring head 7 to stop moving downward, prompting the lever 6 to stop returning to the initial position. At this time, the spring 10 plays a supporting role, and uses the rebound force to drive the gasket 5 to move upward, so that the lever 6, the measuring head 7 and the upper measuring foot 3 are balanced; finally, read the dial indicator pointer reading, so that the product placement angle is parallel to the measuring tool. When the dial indicator reading is the smallest, it is the deviation of the wall thickness. If the thickness of the micrometer pad used in the calibration is t, and the wall thickness deviation is ±δ, then the wall thickness of the product is t±δ. This application uses the principle that the axes of the upper and lower measuring feet of the measuring tool are on the same straight line, and drives the upper measuring foot to move through the lever to achieve point-to-point wall thickness measurement of the part surface.

[0028] The wall thickness measuring tool formed by the above technical solution is simple to operate and has no specific requirements for users. The measurement process is controllable, with good stability and high measurement accuracy. It can meet the production needs of first-line products, ensure the consistency of part quality, and improve product processing efficiency. In the present invention, the axis deviation of the upper and lower measuring feet is no more than φ0.05, and the angle between the arc curvatures is used to determine the structural form of the body, so that the measuring tool and the part do not interfere with each other, thereby realizing point-to-point wall thickness measurement of the curved surface of the part. This measurement method can quickly and accurately measure the wall thickness of different positions of curved thin-walled parts. Not only is the measurement process stable and controllable, but it is also simple to operate, and can achieve rapid measurement and improve measurement efficiency.

[0029] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wall thickness measuring tool for curved thin-walled parts, characterized in that: The invention comprises a main body (1), a lower measuring foot (2) connected to a measuring needle (11) to form a lower measuring foot, and the lower measuring foot (2) is fixed to the main body (1) through a fourth pin (15) and a second screw (12); an upper measuring foot (3) is connected to the main body (1) through a measuring head (7), a spring (10) and a gasket (5) are installed inside the upper measuring foot (3), and the gasket (5) and the measuring head (7) are respectively connected to the first pin (9) through a third pin (14). ) is connected to the upper measuring foot (3); the lever (6) is connected to the body (1) through the second pin (13), and the front end fulcrum of the lever (6) is connected to the end surface of the measuring head (7), and the measuring head (7) is driven to move up and down by pressing the lever (6), thereby driving the lower measuring foot to move; the angle bracket (4) is fixed to the body (1) through the third screw (16), the dial indicator is connected to the angle bracket (4), and the open end of the angle bracket (4) is locked by the first screw (8).

2. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The axes of the measuring needle (11) and the upper measuring foot (3) are on the same center line, and the axis deviation is no more than φ0.

05.

3. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The roughness of the outer circumferential surface of the upper measuring foot (3) and the inner hole surface of the body (1) is required to reach Ra0.4 or above.

4. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The surface roughness of the ball head of the upper measuring foot (3) and the surface roughness of the ball head of the measuring needle (11) are required to reach Ra0.2 or above.

5. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The pin hole in the body (1) that cooperates with the lever (6) is required to have a roughness of Ra0.8 or above.

6. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The pin hole of the lower measuring foot (2) and the measuring needle (11) adopt an interference fit.

7. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The surface of the upper measuring foot (3) is designed with a smooth through groove of 10×1.

5.

8. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The center distance between the pin hole of the lever (6) and the front end boss is consistent with the center distance between the pin hole of the lever (6) and the inner hole of the upper measuring foot (3) in the body (1).

9. The wall thickness measuring tool for curved thin-walled parts according to claim 1, characterized in that: The lower measuring foot (2) and the body (1) are connected in a one-pin-one-nail manner, and the distance from the center of the inner hole of the upper measuring foot (3) to the short end of the body (1) is half the outer radius of the lower measuring foot (2).

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