KR20220165932A - System for measuring the small sized inner diameter - Google Patents

Abstract

The present invention relates to the small-sized inner diameter measuring system and, more specifically, a small-sized inner diameter measuring system capable of preventing warping during fabrication, minimizing the impact of micro-vibration during measurement, and reliably measuring the internal diameter of small holes with dimensions ranging from Φ5 to 15 mm. The small-sized inner diameter measuring system comprises: a support bar; a first jig part and a second jig part, which are provided at lower portions of both sides based on the center of the support bar; a first measurer which is coupled to a lower end of the first jig part and has a lower end being in contact with the inner circumferential surface of one side of a workpiece; a second measurer which is coupled to a lower end of the second jig part and has a lower end being in contact with the inner circumferential surface of the other side of the workpiece; a displacement measuring rod which is coupled to the first jig part; and a balance rod which is coupled to the second jig part so that one end of the balance rod is in contact with one end of the displacement measuring rod. The small-sized inner diameter measuring system detects a change in a distance between one end of the displacement measuring rod and one end of the balance rod and measures the inner diameter of the workpiece, wherein the first measurer and the second measurer are fabricated after tempering of SKD61 material.

Description

Small inner diameter measuring system {System for measuring the small sized inner diameter}

The present invention relates to a small inner diameter measuring system, and more particularly, to a small inner diameter measuring system capable of maximally accurately measuring the inner diameter of a small hole of Φ 5 to 15 mm.

In general, a turning product refers to a product made by rotating a workpiece with a lathe and cutting it into a cylindrical or conical shape against a cutting tool, and such a turning product includes pinions, bearings, shafts, sleeves, bushes, rings, etc. applied to automobiles.

As one of the factors that evaluate the quality of a turned product, we are looking at whether or not the turned product has an outer diameter and an inner diameter of the correct dimensions. A BMD gauge or the like is used.

Cylinder gauges vary greatly in measured values depending on the measurement method, and air gauges have a problem in that the quality of air pressure affects the measured values along with limitations on the processing surface of the workpiece. In addition, the measurement preload of the measuring jig (JIG) and the BMD gauge using the electronic probe is increased, making it difficult to measure the scan (SCAN) and causing wear problems. Such a conventional inner diameter measuring device is impossible to measure the inner diameter of a measurement product having an inner diameter of a small hole of Φ 5 to 15 mm, or it is difficult to accurately measure the inner diameter.

However, the reason why it is difficult to develop a size measurement device for small holes such as Φ 5 to 15 mm is that the smaller the size of the metal material, the greater the risk of bending and the error in the measurement value even with micro vibration.

1. Republic of Korea Patent No. 10-2026033 'Micro Inner Diameter Measuring Device'

The present invention is to solve the above problems, and it is possible to minimize the influence of micro-vibration during measurement while preventing warping during manufacturing, thereby providing a small internal diameter measurement system capable of measuring the internal diameter of a small hole of Φ 5 to 15 mm with high reliability. It is intended to provide

In order to achieve the above object, the present invention, a small inner diameter measurement system, includes a support bar in the form of a bar; First jig parts provided to correspond to lower sides of both sides based on the center of the support bar; and a second jig part; a first measuring ruler coupled to a lower end of the first jig unit and having a lower end in contact with an inner circumferential surface of one side of the object to be measured; a second measuring ruler coupled to the lower end of the second jig unit and having a lower end in contact with the inner circumferential surface of the other side of the object to be measured; a displacement measuring rod coupled to the first jig part; Including a measuring device including a balance rod coupled to the second jig part such that one end is in contact with one end of the displacement measuring rod, the internal diameter of the object to be measured is measured by recognizing a change in the distance between one end of the displacement measuring rod and one end of the balance rod. However, the first probe and the second probe are fabricated by processing after SKD61 tempering.

In addition, it forms a rod shape and is coupled downward to the center of the support bar, and further includes a guide rod having a lower portion inserted into the inner diameter of the object to be measured, wherein the guide rod has one end of the displacement measuring rod and one end of the balance rod accommodated inside. An accommodating hole is formed through the lateral direction, and one end of the displacement measuring rod and one end of the balance rod may come into contact with each other at an intermediate point of the accommodating hole.

In addition, guide grooves are recessed on both sides of the guide rod along the longitudinal direction from the receiving hole to the lower part, and the first measuring ruler and the second measuring ruler have coupling parts coupled to the first jig part and the second jig part, respectively; A measuring part extending from the coupling part and accommodated in the guide groove, and having a probe on the outer side of the lower end in contact with the inner circumferential surface of the object to be measured, wherein the measuring part is provided to be movable in a lateral direction, and the probe extends outward from the lower end of the guide rod. It may be provided so as to protrude.

In addition, the lower end of the guide rod is rounded while forming a cylindrical shape, and may be manufactured by processing SKH59 or HRC60 °.

In addition, a shock absorber coupled upwardly to the center of the support bar; further comprising, wherein the shock absorber is provided between the hubs provided on the upper and lower portions, and the NBR (Nitrile-butadiene rubber) coated elastic body can include

In addition, the support erected from the ground; a seating plate provided under the support and on which the object to be measured is seated; a mounting plate provided on an upper part of the support, movable up and down, and coupled with a measuring device downward so that the lower end of the first measurer and the lower end of the second measurer are located on the upper side corresponding to the inner diameter of the object to be measured; It is coupled downward to the mounting plate so as to be adjacent to the measuring device, and the object-to-be-measured pressure bar is equipped at the lower end with a rotary bearing contacting one side and the other side of the upper surface of the object to be measured while elastically pressurizing the object to be measured according to the downward movement of the mounting plate. A measurement aid including ; may be further included.

According to the present invention, since the first probe and the second probe are processed and manufactured after SKD61 tempering, it is possible to manufacture a measuring device capable of reliably measuring the inner diameter of a small hole of Φ 5 to 15 mm by preventing warpage.

In addition, since the lower part of the guide rod is inserted into the inner diameter of the object to be measured, shaking of the object to be measured can be minimized, and the influence of micro-vibration during measurement can be minimized through a buffer device containing an elastic body coated with NBR (Nitrile-butadiene rubber). can

In addition, vibration and interference can be minimized during measurement through a measurement auxiliary device including a rotating pressure bar to be measured that rotates while elastically pressing the object to be measured, so that the inner diameter of a small hole of Φ5 to 15 mm can be automatically and reliably measured. It is possible to build a system that

1 is a cross-sectional view showing the structure of a measuring device applied to a small internal diameter measuring system according to the present invention;
2 is a view showing the structure of a first measurer and a second measurer in a measuring device applied to a small inner diameter measuring system according to the present invention;
3 is a view showing the structure of a guide rod in a measuring device applied to a small inner diameter measuring system according to the present invention;
Figure 4 is a front view showing a state in which the measuring device applied to the small inner diameter measuring system of the present invention is installed in the measuring auxiliary device;
5 is a side view showing a state in which the measuring device applied to the small inner diameter measuring system of the present invention is installed in the measuring auxiliary device;
6 is a front view showing a state in which an object to be measured is pressed and rotated by a measurement auxiliary device applied to a small internal diameter measuring system according to the present invention;

In the present invention, it is possible to minimize the influence of microvibration during measurement while preventing bending during manufacture, so that the inner diameter of a small hole of Φ 5 to 15 mm can be measured with high reliability, a support bar in the form of a bar; First jig parts provided to correspond to lower sides of both sides based on the center of the support bar; and a second jig part; a first measuring ruler coupled to a lower end of the first jig unit and having a lower end in contact with an inner circumferential surface of one side of the object to be measured; a second measuring ruler coupled to the lower end of the second jig unit and having a lower end in contact with the inner circumferential surface of the other side of the object to be measured; a displacement measuring rod coupled to the first jig part; Including a measuring device including a balance rod coupled to the second jig part such that one end is in contact with one end of the displacement measuring rod, the internal diameter of the object to be measured is measured by recognizing a change in the distance between one end of the displacement measuring rod and one end of the balance rod. However, the first measurer and the second measurer propose a compact inner diameter measurement system characterized in that they are manufactured by processing after SKD61 tempering.

The scope of the present invention is not limited to the embodiments described below, and can be variously modified and implemented by those skilled in the art within the scope of not departing from the technical gist of the present invention.

Hereinafter, a small internal diameter measurement system according to the present invention will be described in detail with reference to FIGS. 1 to 6 attached.

The small inner diameter measurement system of the present invention includes a measuring device (A) for measuring the inner diameter of a small hole of Φ 5 to 15 mm formed in an object to be measured (1), which is a turning product such as a pinion, bearing, shaft, sleeve, bush, ring, etc. And, the measuring device (A) may further include a measuring auxiliary device (B) to stably measure the object to be measured (1).

First, as shown in FIG. 1, the measuring device A includes a support bar 10, a first jig part 20, a second jig part 30, a first measurer 40, and a second measurer 50. ), a displacement measuring rod 60, and a balance rod 70, and may further include a guide rod 80 and a shock absorber 90.

The support bar 10 is formed in a bar shape, and provides a standard for coupling the first jig part 20 and the second jig part 30, the guide rod 80, and the shock absorber 90, which will be described later. do.

The first jig part 20 and the second jig part 30 are provided to correspond to the lower sides of both sides based on the center of the support bar 10 . For example, the first jig part 20 is provided below one side with respect to the center of the support bar 10, the first support part 21, the first spring part 22, the first coupling part 23 and A first set screw 24 may be included.

The first support part 21 is a part where the upper end of the first spring part 22 is attached to form a support point for forming elasticity. The first spring part 22 has an upper end coupled to the first support part 21 to provide an elastic force in a direction parallel to the support bar 10, and may be, for example, a spring sheet, and to the first spring part 22. The elastic force provided by is applied to one side.

Also, the first coupling part 23 is coupled to the lower end of the first spring part 22 and is a part where the displacement measuring rod 60 and the first measurement bar 40 are coupled. The first set screw 24 has a protruding part from the first support part 21 toward the first coupling part 23 and a part protruding from the first coupling part 23 toward the first support part 21 mutually. It is coupled to connect, and the tension of the first spring part 22 can be adjusted according to the characteristics of the first spring part 22 . That is, the tension can be appropriately adjusted in consideration of the effect of the difference in hardness between the heat-treated first spring part 22 and the non-heat-treated first spring part 22 on the measurement.

The second jig part 30 is provided below the other side based on the center of the support bar 10, and includes a second support part 31, a second spring part 32, a second coupling part 33, and a second set. A screw 34 may be included.

The second support part 31 is a part where the upper end of the second spring part 32 is attached to form a support point for forming elasticity. The second spring part 32 has an upper end coupled to the second support part 31 to provide an elastic force in a direction parallel to the support bar 10, and may be, for example, a spring sheet, and to the second spring part 32. The elastic force provided by is applied to the other side.

And the second coupling part 33 is coupled to the lower end of the second spring part 32 and is a part where the balance rod 70 and the second measurer 50 are coupled. The second set screw 34 includes a portion protruding from the second support portion 31 toward the second coupling portion 33 and a portion protruding from the second coupling portion 33 toward the second support portion 31 mutually. It is coupled to connect, and the tension of the second spring part 32 can be adjusted according to the characteristics of the second spring part 32 . That is, the tension can be appropriately adjusted in consideration of the effect of the difference in hardness between the heat-treated second spring part 32 and the non-heat-treated second spring part 32 on the measurement.

The first measuring ruler 40 is coupled to the lower end of the first jig part 20 and the lower end is in contact with the inner circumferential surface of one side of the small hole formed in the object to be measured 1 . Specifically, as shown in FIG. 2, the first measuring ruler 40 is formed extending downward from the coupling portion 40a coupled to the lower end of the first jig portion 20 and the coupling portion 40a, and is formed outside the lower end. It may include a measuring unit 40b equipped with a probe 41 contacting an inner circumferential surface of one side of the object to be measured 1 . At this time, the probe 41 is preferably formed to form a convex hemispherical shape toward the outside, and may be made of an ultra-hard alloy.

The second measuring ruler 50 is coupled to the lower end of the second jig part 30 and the lower end is in contact with the inner circumferential surface of the other side of the small hole formed in the object to be measured 1. Specifically, as shown in FIG. 2, the second measuring ruler 50 is formed extending downward from the coupling portion 50a coupled to the lower end of the second jig portion 30 and the coupling portion 50a, and is formed outside the lower end. It may include a measurement unit 50b equipped with a probe 51 contacting the inner circumferential surface of the other side of the object to be measured 1 . At this time, the probe 51 is preferably formed to form a convex hemispherical shape toward the outside, and may be made of an ultra-hard alloy.

The above-described first probe 40 and second probe 50 are manufactured by wire-cutting electric discharge processing after tempering with SKD61, which is resistant to thermal shock and thermal fatigue. Due to this, bending is prevented during the manufacture of the first measurement bar 40 and the second measurement bar 50, and it is possible to manufacture a measuring device capable of reliably measuring the inner diameter of a small hole of Φ5 to 15 mm.

The displacement measuring rod 60 is inserted into and coupled to a through hole formed laterally in the lower part of the first jig part 20, that is, in the first coupling part 23, and is provided parallel to the support bar 10. The displacement measuring rod 60 may be composed of a Linear Variable Differential Transformer (LVDT), and the LVDT may accurately measure a linear distance difference and convert it into an electrical signal.

The balance rod 70 is inserted into and coupled to a through hole formed laterally in the lower part of the second jig part 30, that is, in the second coupling part 33, and is provided parallel to the support bar 10. At this time, one end of the balance rod 70 is provided to be in contact with one end of the displacement measuring rod 60.

Accordingly, in the present invention, the inner diameter of the object to be measured 1 is measured by recognizing a change in the distance between one end of the displacement measuring rod 60 and one end of the balance rod 70 described above. For example, the displacement measuring rod 60 and the balance rod 70 are engaged with each other in an elastic state due to the first spring part 22 and the second spring part 32, so that the object to be measured 1 Even if an eccentric error occurs in the rotation center axis during rotation of the object, it moves fluidly according to the inner diameter of the object to be measured (1) and can measure only the change in the inner diameter of the object to be measured (1), so accurate measurement of the inner diameter is impossible. It is possible.

On the other hand, the guide rod 80 in the present invention prevents the flow of the first measurement bar 40 and the second measurement bar 50 provided at the lower end of the probes 41 and 51 in contact with the inner circumferential surface of the small hole having a diameter of Φ5 to 15 mm. In addition, it serves to block the influence of external factors in measuring the inner diameter by the displacement measuring rod 60 and the balance rod 70. To this end, the guide rod 80, for example, forms a rod shape as shown in FIG. 1 and is coupled downward to the center of the support bar 10, and the lower part may be inserted into the inner diameter of the object to be measured 1. .

In the guide rod 80, as shown in FIGS. 1 and 3, an accommodation hole 81 in which one end of the displacement measuring rod 60 and one end of the balance rod 70 are accommodated is formed through in the lateral direction. In addition, one end of the displacement measuring rod 60 and one end of the balance rod 70 may come into contact with each other at the midpoint of the receiving hole 81. That is, the present invention is recognized through a change in the distance between one end of the displacement measuring rod 60 and one end of the balance rod 70, such as wind, dust, etc. It is possible to block influence from external factors, thereby increasing the accuracy of interval change recognition.

In addition, guide grooves 82 are recessed on both sides of the guide rod 80 along the longitudinal direction from the receiving hole 81 to the lower portion accommodated inside the object to be measured 1, as shown in FIGS. 1 and 3. It can be. The measuring parts 40b and 50b of the first measuring element 40 and the second measuring element 50 are accommodated inside the guide groove 82, and the measuring parts 40b and 50b are located inside the guide groove 82. It is provided to be flexible in the direction. This is considered as the fact that the first measuring element 40 and the second measuring element 50 are moved in the lateral direction according to the inner diameter of the object to be measured 1 . In this way, the probes 41 and 51 provided at the lower ends of the measurement units 40b and 50b accommodated in the guide groove 82 are provided so as to protrude outward from the lower end of the guide rod 80, and the measured object 1 The probes 41 and 51 are configured to come into contact with the inner circumferential surface of the

In addition, the lower end of the guide rod 80 accommodated inside the object to be measured 1 has a cylindrical shape as shown in FIGS. 1 and 3 and the end is rounded, and the inner diameter of the object to be measured 1 is rounded. It is manufactured to be slightly smaller, serves as a guide when inserted into the object to be measured (1), and serves to fix the object to be measured (1) so that it does not move in the centering and lateral directions during measurement. The lower end of the guide bar 80 is preferably manufactured by processing SKH59, HRC60 ° in order to increase wear resistance.

On the other hand, when measuring the inner diameter of the object to be measured (1), the measuring device (A) lowers the measuring device (A) so that the probes (41, 51) come into contact with the inner circumferential surface of the object (1) to be measured. When the inner diameter measurement of (1) is completed, the measuring device (A) must be moved upward, and the vibration generated when the measuring device (A) is moved in the vertical direction and the components included in the measuring device (A) during measurement It is necessary to minimize the vibration caused by the simultaneous operation of To this end, the measuring device A in the present invention may further include a shock absorber 90 as shown in FIG. 1 .

The shock absorber 90 is upwardly coupled to the center of the support bar 10, may include a hub 91 and an elastic body 92, and may be, for example, a jaw coupling. The hub 91 is provided on the upper and lower portions of the shock absorber 90, and the elastic body 92 is provided between the hubs 91 provided on the upper and lower portions, respectively. At this time, the hub may be made of SM45C, and the elastic body 92 is preferably made of NBR (Nitrile-butadiene rubber) coated, through which the influence of microvibration during measurement can be minimized.

Meanwhile, the present invention may further include a measurement auxiliary device (B) in which the measurement device (A) is moved in the vertical direction and the measurement object (1) is positioned below the measurement device (A). As shown in FIGS. 4 to 6 , the measurement assist device B may include a support 100, a seating plate 200, a mounting plate 300, a pressure bar 400, and a cylinder 500. can

The support 100 may be formed in a plate shape or a bar shape, and is erected vertically from the ground. The seating plate 200 has a plate shape and is provided at the bottom of the support 100 to be orthogonal to the support 100, so that the object to be measured 1 is seated on the upper surface. In addition, although not shown in the drawing, the seating plate 200 includes a configuration for rotating the object to be measured 1 seated on the upper surface in the lateral direction.

The mounting plate 300 has a plate shape and is provided above the support 100 so as to be orthogonal to the support 100, and is provided to move up and down along the longitudinal direction of the support 100. For example, the mounting plate 300 is connected to the cylinder 500 provided on the upper end of the support 100 and can move up and down due to the operation of the cylinder 500.

In addition, in the mounting plate 300, the measuring device A is coupled downward, and the measuring device A moves toward or away from the object to be measured 1 according to the movement of the mounting plate 300. It can be moved to lift. At this time, the measuring device (A) is provided vertically so that the lower end of the first measuring element 40 and the lower end of the second measuring element 50 are located on the upper side corresponding to the inner diameter of the object to be measured (1). In addition, when the measuring device (A) and the mounting plate 300 are coupled, for example, a coupling bar protruding downward from the mounting plate 300 is inserted into the shock absorber 90 of the measuring device (A) to be coupled. can

The measuring object pressure rod 400 is vertically coupled downward to the mounting plate 300 so as to be adjacent to the measuring device A. In addition, the object to be measured pressing bar 400 elastically presses the object to be measured 1 rotating according to the downward movement of the mounting plate 300 . To this end, as shown in FIGS. 4 and 6, two pressure rods 400 are provided to correspond to both sides of the measuring device (A), and each lower end of the object to be measured (1). It is preferable to be configured to elastically press one side of the upper surface and the other side of the upper surface of the object to be measured (1).

And, in order to elastically press the object to be measured 1, the object to be measured pressure bar 400 may be provided with a compression spring, and in order to provide a compression force to the rotating object to be measured 1, two pressure rods to the object to be measured 400 are provided. As shown in FIG. 6 , 400 may be provided with a rotation bearing 410 in contact with one side and the other side of the object to be measured 1 rotating, respectively, at the lower end.

As such, vibration and interference during measurement can be minimized through the measuring auxiliary device (B) including the measuring object pressing bar 400 that elastically presses the object to be measured (1) and provides a compressive force. It is possible to construct a system that automatically and reliably measures the inner diameter of a small hole of 15 mm.

A : Measuring device B : Measuring auxiliary device
1: Object to be measured
10: support bar 20: first jig part
21: first support part 22: first spring part
23: first coupling part 24: first set screw
30: second jig part 31: second support part
32: second spring part 33: second coupling part
34: second set screw 40: first measurer
40a: coupling part 40b: measuring part
41: probe 50: second probe
50a: coupling part 50b: measuring part
51: probe 60: displacement measuring rod
70: balance rod 80: guide rod
81: receiving hole 82: guide groove
90: shock absorber 91: hub
92: elastic body
100: support 200: seating plate
300: Mounting plate 400: Pressure bar for the object to be measured
410: rotary bearing 500: cylinder

Claims (6)

A support bar 10 in the form of a bar;
A first jig part 20 provided to correspond to the lower sides of both sides based on the center of the support bar 10; and a second jig part 30;
a first measuring ruler 40 coupled to the lower end of the first jig part 20 and having a lower end in contact with an inner circumferential surface of one side of the object to be measured 1;
a second measuring ruler 50 coupled to the lower end of the second jig part 30 and having a lower end in contact with the inner circumferential surface of the other side of the object to be measured 1;
a displacement measuring rod 60 coupled to the first jig part 20;
A balance rod 70 coupled to the second jig part 30 such that one end contacts one end of the displacement measuring rod 60; The inner diameter of the object to be measured 1 is measured by recognizing the change in the distance between one end and the other end of the balance rod 70,
The first measurer 40 and the second measurer 50 are small inner diameter measurement system, characterized in that manufactured by processing after SKD61 tempering. According to claim 1,
A guide rod 80 formed in the form of a rod and coupled downward to the center of the support bar 10 and having a lower portion inserted into the inner diameter of the object to be measured 1; further comprising,
In the guide rod 80, an accommodation hole 81 in which one end of the displacement measuring rod 60 and one end of the balance rod 70 are accommodated is formed through in the lateral direction,
A small inner diameter measuring system, characterized in that one end of the displacement measuring rod 60 and one end of the balance rod 70 are in contact at the midpoint of the receiving hole 81. According to claim 2,
The guide rod 80 is formed with guide grooves 82 recessed on both sides along the longitudinal direction from the receiving hole 81 to the bottom,
The first measurement bar 40 and the second measurement bar 50 include coupling portions 40a and 50a coupled to the first jig portion 20 and the second jig portion 30, respectively, and the coupling portion 40a, 50a) and accommodated in the guide groove 82, and includes measuring units 40b and 50b having probes 41 and 51 in contact with the inner circumferential surface of the object to be measured 1 on the outer side of the lower end,
The measurement units 40b and 50b are provided to be movable in the lateral direction, and the probes 41 and 51 are provided so as to protrude outward from the lower end of the guide rod 80. According to claim 2,
The lower end of the guide rod 80 is rounded at the end while forming a cylindrical shape, and the small inner diameter measurement system, characterized in that it is manufactured by processing to SKH59, HRC60 °. According to claim 1,
A shock absorber 90 coupled upward to the center of the support bar 10; further comprising,
The shock absorber 90 includes a hub 91 provided on the upper and lower parts and an elastic body 92 provided between the hub 91 and coated with NBR (Nitrile-butadiene rubber). measurement system. According to claim 1,
Support 100 erected from the ground;
a seating plate 200 provided under the support 100 and on which the object to be measured 1 is seated;
It is provided on the upper part of the support 100 and is movable up and down, and the lower end of the first measurer 40 and the lower end of the second measurer 50 are located on the upper side corresponding to the inner diameter of the object to be measured (1). Mounting plate 300 to which the measuring device (A) is coupled downward;
It is coupled downward to the mounting plate 300 so as to be adjacent to the measuring device (A), and the upper surface of the object to be measured (1) elastically presses the object (1) according to the downward movement of the mounting plate (300). A compact internal diameter measuring system, characterized in that it further comprises a measurement auxiliary device (B) including a pressure rod 400 having a rotating bearing 410 in contact with one side and the other side.

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