Testing device and method for measuring the flatness of a hole circumference

Abstract

This invention discloses a detection device and a method for measuring the flatness of a hole circumference. The detection device includes a detection part, a connecting rod, and a mating part. The detection part has a clearance opening on its side to provide clearance space when the detection part passes through the hole of the workpiece to be tested. The connecting rod is perpendicular to the upper surface of the detection part and one end is installed on the detection part. A first scale line is provided on the circumference of the connecting rod. The mating part is slidably disposed on the connecting rod along the extension direction of the connecting rod. The mating part has a detection position where it clamps the workpiece to be tested together with the detection part for measurement and a position away from the detection part during its active stroke. By passing the detection part through the hole of the workpiece to be tested and abutting against the lower surface of the workpiece, the mating part is slid along the connecting rod towards the detection part and abutting against the upper surface of the workpiece, thereby clamping the workpiece together with the detection part for measurement. The measured value is then compared with a known workpiece thickness value to obtain the flatness parameter of the hole circumference.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a testing device and a method for measuring the flatness of a hole circumference. Background Technology

[0002] In the automotive parts industry, during the processing of various parts, when holes and shafts are mated, the surrounding flat surface of the hole serves as the mating end for connecting other parts. In addition to requirements for positional accuracy and machining accuracy, it also requires a certain degree of flatness. That is to say, the flatness of the hole's surrounding surface needs to be controlled within a specified range to meet assembly requirements.

[0003] Currently, there are roughly three methods for flatness inspection of the plane corresponding to the holes of a part: First, using traditional flatness gauges. These gauges are large and difficult to handle, requiring pre-dissection of the product to expose the surface to be inspected, fabrication of a support body for the part, and insertion of inspection pins after positioning at all locations. This process is complex and costly, and has limitations for some small parts. Second, using a large-end go / no-go gauge. This method is simple to operate, but the measurement results are relatively inaccurate. Third, using a coordinate measuring machine (CMM). Many small and medium-sized parts have complex shapes and high precision requirements, which traditional measurement methods cannot meet. CMM inspection is necessary, offering high accuracy but low efficiency and high cost. Summary of the Invention

[0004] The main objective of this invention is to provide a detection device and a method for measuring the flatness of a hole circumference. The aim is to provide a detection device for measuring the flatness of a hole circumference that is relatively small in size, simple in structure, easier to operate, saves measurement time, and can be used for on-site measurement in production.

[0005] To achieve the above objectives, the present invention provides a detection device for measuring the flatness of a hole circumference, wherein the detection device for measuring the flatness of a hole circumference comprises:

[0006] The probe has a clearance opening on its side to provide clearance space when the probe passes through a hole in the workpiece to be inspected;

[0007] A connecting rod, perpendicular to the upper surface of the detection unit and with one end mounted to the detection unit, wherein a first scale line is provided on the circumference of the connecting rod; and,

[0008] The mating part is slidably disposed on the connecting rod along the extension direction of the connecting rod. The mating part has a detection position where it clamps the workpiece to be tested together with the detection part for measurement, and a move-out position away from the detection part during its active stroke.

[0009] Optionally, the mating part includes a main body and an observation part protruding from the middle of the upper surface of the main body. The upper surface of the mating part is provided with a through hole penetrating the observation part and the main body, so as to be slidably sleeved on the connecting rod.

[0010] The observation unit has an opening on its side for reading measurement values, and a second scale line is also provided on the observation unit corresponding to the opening.

[0011] Optionally, the mating part has a mounting hole for slidingly fitting the mating part onto the connecting rod, the connecting rod has a guide groove extending along the extension direction of the connecting rod, and the inner side of the mounting hole has a guide protrusion corresponding to the guide groove, the guide protrusion being slidably installed in the guide groove.

[0012] Optionally, the inner wall of the mounting hole is formed with a mounting groove, and an elastic element is connected to the bottom of the mounting groove, and the guide protrusion is connected to the elastic element.

[0013] Optionally, the detection unit includes a main body and two locking arms formed on both sides of the clearance opening, each of the locking arms being hinged to the main body.

[0014] Optionally, the device for detecting the flatness of the measuring hole periphery includes a detachable connection structure, which is disposed between the probe and the connecting rod.

[0015] Optionally, the detection part is provided with a threaded hole, and the connecting end of the connecting rod is provided with a thread on its periphery, and the connecting rod is threadedly connected to the detection part;

[0016] The detachable connection structure includes the screw hole and the thread.

[0017] Optionally, the detachable connection structure includes a first magnetic part and a second magnetic part. A connecting groove is formed on the detection part, and the first magnetic part is installed on the connecting groove. The connecting end of the connecting rod is provided with a second magnetic part, and the first magnetic part and the second magnetic part have opposite magnetic properties.

[0018] Optionally, the mating part has a plurality of detection protrusions of the same height at intervals on the end face facing the detection part.

[0019] The present invention also provides a method for measuring flatness at a detection surface of a hole to be inspected, wherein the hole to be inspected further includes a back surface opposite to the detection surface, and the measurement method includes the following steps:

[0020] Select the appropriate probe based on the size of the hole to be inspected;

[0021] The appropriate probe and connecting rod are assembled into a preliminary assembly, wherein the side of the probe has a clearance opening;

[0022] The initial assembly is placed horizontally inside the hole to be tested, so that the two locking arms of the clearance opening are respectively located on both sides of the hole to be tested.

[0023] The connecting rod is rotated so that its axis gradually approaches the axis of the hole to be tested, so that the detection part moves from the detection surface side of the hole to the back surface side.

[0024] The mating part is slidably sleeved on the connecting rod and located on one side of the detection surface to form a measuring structure, wherein the mating part is provided with an exposure opening;

[0025] Rotate the measuring structure so that it stops at different positions, so as to obtain the actual scale value corresponding to the connecting rod through the display port.

[0026] In the technical solution provided by this invention, after the probe passes through the hole of the workpiece to be measured and abuts against the lower surface of the workpiece, the mating part slides along the connecting rod towards the probe and abuts against the upper surface of the workpiece. Then, the workpiece is clamped together with the probe for measurement. The measurement value corresponding to the first scale line on the periphery of the connecting rod is read. The measured value is then compared with the known workpiece thickness value to obtain the flatness parameter of the hole periphery. The operation is simple, the time is short, and there is no need to disassemble the workpiece itself. The measurement can be carried out on the production site. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A perspective schematic diagram of an embodiment of the detection device provided by the present invention;

[0029] Figure 2 for Figure 1 A three-dimensional schematic diagram of the mating parts;

[0030] Figure 3 for Figure 1 A three-dimensional schematic diagram of the detection unit in the middle;

[0031] Figure 4 for Figure 1 A three-dimensional schematic diagram of the connecting rod in the middle;

[0032] Figure 5 This is a schematic diagram of the detection device (with the workpiece to be detected clamped in it);

[0033] Figure 6 A schematic flowchart of an embodiment of the flatness measurement method of the present invention;

[0034] Figure 7 for Figure 6 A schematic diagram illustrating the working principle of the method for measuring flatness.

[0035] Explanation of icon numbers:

[0036] label name label name 100 Detection device 31 Main body 1 Detection Department 32 Observation Department 11 Give way 321 Exposed mouth 12 Body part 33 Through hole 13 clamp arm 34 Mounting holes 2 Connecting rod 35 guide protrusion 21 Guide groove 4 screw hole 3 Coordination Department 5 Thread

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] In the automotive parts industry, during the processing of various parts, when holes and shafts are mated, the surrounding flat surface of the hole serves as the mating end for connecting other parts. In addition to requirements for positional accuracy and machining accuracy, it also requires a certain degree of flatness. That is to say, the flatness of the hole's surrounding surface needs to be controlled within a specified range to meet assembly requirements.

[0042] Currently, there are roughly three methods for flatness inspection of the plane corresponding to the holes of a part: First, using traditional flatness gauges. These gauges are large and difficult to handle, requiring pre-dissection of the product to expose the surface to be inspected, fabrication of a support body for the part, and insertion of inspection pins after positioning at all locations. This process is complex and costly, and has limitations for some small parts. Second, using a large-end go / no-go gauge. This method is simple to operate, but the measurement results are relatively inaccurate. Third, using a coordinate measuring machine (CMM). Many small and medium-sized parts have complex shapes and high precision requirements, which traditional measurement methods cannot meet. CMM inspection is necessary, offering high accuracy but low efficiency and high cost.

[0043] To address the aforementioned problems, the present invention provides a testing device for measuring the flatness of a hole's circumference. Figures 1 to 5 This is a specific embodiment of the detection device for measuring the flatness of a hole circumference provided by the present invention.

[0044] Please see Figure 1 The detection device 100 for measuring the flatness of a hole circumference includes a detection part 1, a connecting rod 2, and a mating part 3. The detection part 1 has a clearance opening 11 on its side to provide clearance space when the detection part 1 passes through the hole of the workpiece to be tested. The connecting rod 2 is perpendicular to the upper surface of the detection part 1 and one end is mounted on the detection part 1. The connecting rod 2 has a first scale line on its circumference. The mating part 3 is slidably disposed on the connecting rod 2 along the extension direction of the connecting rod 2. The mating part 3 has a detection position where it clamps the workpiece to be tested together with the detection part 1 for measurement and a move-out position away from the detection part 1 during its active stroke.

[0045] In the technical solution provided by the present invention, after the probe 1 passes through the hole of the workpiece to be measured and abuts against the lower surface of the workpiece, the mating part 3 slides along the connecting rod 2 towards the probe 1 and abuts against the upper surface of the workpiece, and then the workpiece is clamped together with the probe 1 for measurement. The measurement value corresponding to the first scale line on the periphery of the connecting rod 2 is read, and the measurement value is compared with the known workpiece thickness value to obtain the flatness parameter of the hole periphery. The operation is simple, the time is short, and there is no need to disassemble the workpiece itself, so the measurement can be carried out on the production site.

[0046] It should be noted that in this embodiment, the measured scale value is the thickness scale value. Since the thickness of the workpiece is known after processing, the flatness value can be obtained by comparing the measured thickness value with the known thickness value. For example, it can be the difference between the measured thickness value and the known thickness value.

[0047] Specifically, to improve the accuracy of reading scale values, in this embodiment, the mating part 3 includes a main body 31 and an observation part 32 protruding from the middle of the upper surface of the main body 31. The upper surface of the mating part 3 has a through hole 33 penetrating the observation part 32 and the main body 31 for slidingly fitting onto the connecting rod 2. The observation part 32 has a display opening 321 on its side for reading measurement values. A second scale line is also provided on the observation part 32 corresponding to the display opening 321. Reading the scale through the display opening 321 is more intuitive and accurate than reading the scale value at the top of the mating part 3. Furthermore, by dividing the mating part 3 into two parts, using the main body 31 to abut against the upper surface of the workpiece and using the display opening 321 on the observation part 32 to read measurement values, mutual interference between the two is avoided, further improving measurement accuracy. It is also worth mentioning that the second scale line can be used in conjunction with the first scale line, employing a similar... For example, the measuring method of a vernier caliper can be such that the connecting rod 2 is used as the main scale of the vernier caliper, and the observation part 32 is used as the vernier. The second scale line can be set to a length of 9mm and divided into 10 equal parts, achieving a measurement accuracy of 0.1mm. When sliding the mating part 3, the integer scale value of the first scale line and the vernier scale value of the second scale line are read. The vernier scale value is read by reading the scale value corresponding to the scale line in the observation part 32 that coincides with the first scale line, multiplying this value by the accuracy value to obtain the vernier scale value, and then adding the two scale values ​​to obtain the measurement of the workpiece. Similarly, the second scale value can be set to a length of 19mm and divided into 20 equal parts, improving the measurement accuracy to 0.05mm, or the second scale value can be set to 49mm and divided into 50 equal parts, improving the measurement accuracy to 0.02mm.

[0048] To ensure that the mating part 3 can slide stably on the connecting rod 2 without wobbling and causing measurement errors, in this embodiment, the mating part 3 has a mounting hole 34 for slidingly fitting the mating part 3 onto the connecting rod 2. The connecting rod 2 has a guide groove 21 extending along the extension direction of the connecting rod 2. The inner side of the mounting hole 34 has a guide protrusion 35 corresponding to the guide groove 21, and the guide protrusion 35 is slidably installed in the guide groove 21. Through the sliding engagement of the guide protrusion 35 and the guide groove 21, the mating part 3 can slide stably along the extension direction of the connecting rod 2 without wobbling, avoiding measurement errors caused by the mating part 3 and the detection part 1 not being parallel. Moreover, the first scale value can be set in the guide groove so that the extension direction of the scale line is consistent with the movement direction of the mating part 3, thereby reducing errors.

[0049] Furthermore, considering that after the mating part 3 clamps the test piece between the upper and lower parts of the detection part 1, the mating part 3 can take multiple readings around the axis of the connecting rod 2 to improve measurement accuracy, in this embodiment, a mounting groove is formed on the inner sidewall of the mounting hole 34, and an elastic element is connected to the bottom of the mounting groove. The guide protrusion 35 is connected to the elastic element. When the mating part 3 rotates, the mounting groove can provide clearance space for the elastic protrusion, and the elastic element can provide a reset function for the elastic protrusion so that it can be reset when it mates with the guide groove 21 and continue to play a guiding role.

[0050] Specifically, considering that when the detection part 1 is inserted into the hole to be detected, the hole may be too small to fit through, in this embodiment, the detection part 1 includes a body part 12 and two locking arms 13 formed on both sides of the clearance opening 11. Each locking arm 13 is hinged to the body part 12. In this way, during the insertion process, the locking arm 13 can rotate around the hinge point to provide a larger clearance space for the clearance opening 11, thereby adapting to holes of different sizes.

[0051] Specifically, considering that when the probe 1 is inserted into the hole to be tested, the hole may be particularly small, and rotating the clamping arm 13 may not be sufficient, in this embodiment, the hole circumference flatness measuring device 100 includes a detachable connection structure. This detachable connection structure is located between the probe 1 and the connecting rod 2. Through this detachable connection structure, a suitable probe 1 can be selected for flatness measurement. It should be noted that this solution and the aforementioned solution can be implemented separately or simultaneously.

[0052] Furthermore, the detection part 1 is provided with a screw hole 4, and the connecting end of the connecting rod 2 is provided with a thread 5 on its periphery. The connecting rod 2 is threadedly connected to the detection part 1. The detachable connection structure includes the screw hole 4 and the thread 5. Through the cooperation of the thread 5 and the screw hole 4, while ensuring detachability, the rigidity and strength of the connecting parts after the two are connected are also improved, avoiding damage due to excessive force during operation.

[0053] Furthermore, considering that the connecting rod 2 needs to be perpendicular to the detection part 1, in this embodiment, the detachable connection structure includes a first magnetic part and a second magnetic part. A connecting groove is formed on the detection part 1, and the first magnetic part is installed on the connecting groove. The connecting end of the connecting rod 2 is provided with a second magnetic part. The first magnetic part and the second magnetic part have opposite magnetic properties. The connection and installation can be achieved simply by inserting the second magnetic part of the connecting rod 2 into the first magnetic part of the connecting groove, without the need for rotation or other means. This ensures that the connecting rod 2 and the detection part 1 remain perpendicular.

[0054] Specifically, during the machining of the periphery of holes in automotive workpieces, there are not only localized protrusions leading to poor flatness, but also localized depressions. To simultaneously measure the flatness of the periphery when localized depressions exist, in this embodiment, the mating part 3 has multiple detection protrusions of the same height spaced apart on its end face facing the detection part 1. These detection protrusions extend into the localized depressions to measure the flatness of the periphery, avoiding measurement errors when localized depressions are present. This provides a detection device 100 that can accurately measure flatness under various conditions.

[0055] In addition, please see Figure 6 The present invention also provides a method for measuring flatness, for measuring the flatness of a detection surface of a hole to be inspected, wherein the hole to be inspected further includes a back surface opposite to the detection surface, characterized in that the measurement method includes the following steps:

[0056] S10: Select the appropriate probe 1 according to the size of the hole to be detected.

[0057] S20: Assemble the suitable detection part 1 and connecting rod 2 into a preliminary assembly, wherein the side of the detection part 1 has a clearance opening 11.

[0058] S30: Place the initial assembly horizontally inside the hole to be tested, so that the two locking arms 13 of the clearance port 11 are respectively located on both sides of the hole to be tested.

[0059] It should be noted that, in this embodiment, reference can be made to... Figure 7 Step ① in the process.

[0060] S40: Rotate the connecting rod 2 so that its axis gradually approaches the axis of the hole to be tested, so that the detection part 1 moves from the detection surface side of the hole to the back surface side.

[0061] It should be noted that, in this embodiment, reference can be made to... Figure 7 Steps ②, ③, and ④ in the text.

[0062] S50: The mating part 3 is slidably sleeved on the connecting rod 2 and located on one side of the detection surface to form a measuring structure, wherein the mating part 3 is provided with an exposure port 321.

[0063] It should be noted that, in this embodiment, reference can be made to... Figure 7 Steps ⑤ and ⑥ in the process.

[0064] S60: Rotate the measuring structure so that it stops at different positions, so as to obtain the actual scale value corresponding to the connecting rod 2 through the display port 321.

[0065] In this embodiment, a suitable probe 1 is selected according to the size of the hole to be tested. The suitable probe 1 and the connecting rod 2 are assembled into a preliminary assembly. The probe 1 has a clearance opening 11 on its side. The preliminary assembly is placed horizontally in the hole to be tested, so that the two retaining arms 13 of the clearance opening 11 are respectively located on both sides of the hole to be tested. The connecting rod 2 is rotated so that the axis of the connecting rod 2 gradually approaches the axis of the hole to be tested, so that the probe 1 moves from the detection surface side of the hole to the opposite side. Then, the mating part 3 is slidably sleeved on the connecting rod 2 and positioned on the detection surface side. A measuring structure is formed on the side, wherein the mating part 3 is provided with an exposure port 321, through which the measurement value can be read. In order to improve the accuracy of the measurement value, the measuring structure can be rotated multiple times so that the measuring structure stops at different positions, so as to obtain the actual scale value corresponding to the connecting rod 2 through the exposure port 321. Then, the average value of the multiple measurements or other methods can be compared with the known workpiece thickness to obtain the detected flatness measurement value. In this embodiment, the flatness measurement value is the difference between the average thickness measurement value and the known thickness measurement value.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A testing device for measuring the flatness of a hole circumference, characterized in that, include: The probe has a clearance opening on its side to provide clearance space when the probe passes through a hole in the workpiece to be inspected; A connecting rod, perpendicular to the upper surface of the detection unit and with one end mounted to the detection unit, wherein a first scale line is provided on the circumference of the connecting rod; and, The mating part is slidably disposed on the connecting rod along the extension direction of the connecting rod. The mating part has a detection position that, together with the detection part, clamps the workpiece to be tested for measurement, and a move-out position away from the detection part during its active stroke. The detection unit includes a main body and two locking arms formed on both sides of the clearance opening, and each locking arm is hinged to the main body; The device for detecting the flatness of the measuring hole periphery includes a detachable connection structure, which is disposed between the detection part and the connecting rod; The detection part is provided with a threaded hole, and the connecting end of the connecting rod is provided with a thread on its periphery. The connecting rod is threadedly connected to the detection part. The detachable connection structure includes the screw hole and the thread; or... The detachable connection structure includes a first magnetic part and a second magnetic part. A connecting groove is formed on the detection part, and the first magnetic part is installed on the connecting groove. The connecting end of the connecting rod is provided with a second magnetic part. The first magnetic part and the second magnetic part have opposite magnetic properties.

2. The testing device for measuring the flatness of a hole circumference as described in claim 1, characterized in that, The mating part includes a main body and an observation part protruding from the middle of the upper surface of the main body. The upper surface of the mating part is provided with a through hole that passes through the observation part and the main body, so as to be slidably sleeved on the connecting rod. The observation unit has an opening on its side for reading measurement values, and a second scale line is also provided on the observation unit corresponding to the opening.

3. The testing device for measuring the flatness of a hole circumference as described in claim 1, characterized in that, The mating part has a mounting hole for slidingly fitting the mating part onto the connecting rod. The connecting rod has a guide groove extending along the extension direction of the connecting rod. The inner side of the mounting hole has a guide protrusion corresponding to the guide groove, and the guide protrusion is slidably installed in the guide groove.

4. The testing device for measuring the flatness of a hole circumference as described in claim 3, characterized in that, An installation groove is formed on the inner sidewall of the mounting hole, and an elastic element is connected to the bottom of the mounting groove. The guide protrusion is connected to the elastic element.

5. The testing device for measuring the flatness of a hole circumference as described in claim 1, characterized in that, The mating part has multiple detection protrusions of the same height at intervals on the end face facing the detection part.

6. A method for measuring flatness, comprising using a detection device for measuring the flatness of a hole circumference as described in any one of claims 1 to 5, for measuring the flatness at a detection surface of a hole to be detected, wherein the hole to be detected further comprises a back surface opposite to the detection surface, characterized in that, The measurement method includes the following steps: Select the appropriate probe based on the size of the hole to be inspected; The appropriate probe and connecting rod are assembled into a preliminary assembly, wherein the side of the probe has a clearance opening; The initial assembly is placed horizontally inside the hole to be tested, so that the two locking arms of the clearance opening are respectively located on both sides of the hole to be tested. The connecting rod is rotated so that its axis gradually approaches the axis of the hole to be tested, so that the detection part moves from the detection surface side of the hole to the back surface side. The mating part is slidably sleeved on the connecting rod and located on one side of the detection surface to form a measuring structure, wherein the mating part is provided with an exposure opening; Rotate the measuring structure so that it stops at different positions, so as to obtain the actual scale value corresponding to the connecting rod through the display port.

Images