CN114646252A - Device and method for digitally detecting excircle fillet - Google Patents
Device and method for digitally detecting excircle fillet Download PDFInfo
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- CN114646252A CN114646252A CN202210301544.6A CN202210301544A CN114646252A CN 114646252 A CN114646252 A CN 114646252A CN 202210301544 A CN202210301544 A CN 202210301544A CN 114646252 A CN114646252 A CN 114646252A
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- fillet
- excircle
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- inclined hole
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001915 proofreading effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention provides a device and a method for digitally detecting an excircle fillet, which solve the problems that a thin steel sheet of an existing R gauge is of a semicircular structure, and the arc length of an excircle fillet RX of a part is short, so that the thin steel sheet cannot be practical with the surface of the part, and further the excircle fillet of the part cannot be measured. The device comprises a main body and a dial indicator; the main body is provided with an inclined hole with an included angle of alpha/2 with the horizontal plane and a V-shaped positioning groove positioned at the lower side port of the inclined hole, the angle of the V-shaped positioning groove is alpha, and the angular bisector of the V-shaped positioning groove is superposed with the central line of the inclined hole; the dial indicator is fixed on the main body, a measuring rod of the dial indicator is arranged in an inclined hole of the main body, and a measuring head at the lower end of the measuring rod extends out of the inclined hole; the center lines of the measuring rod and the measuring head are superposed with the center line of the inclined hole; the excircle fillet R of the part to be measured is obtained through the following formula:
in the formula: l is the reading of the dial indicator.
Description
Technical Field
The invention relates to a fillet detection technology, in particular to a device and a method for digitally detecting an excircle fillet.
Background
The fillet (R corner) of a general mechanical part is generally detected by an R gauge. The R gauge is a whole set of thin steel sheets with various standard R sizes, the R gauge is used for comparing with the R angle of the part to be measured during measurement, and the numerical value marked by the thin steel sheets which is completely matched with the R angle of the part to be measured is the size of the R angle of the part to be measured.
For the flange shaft part of the speed reducer, in order to prevent the part from cracking caused by heat treatment, as shown in fig. 1, the size of an excircle fillet RX with an included angle of alpha degrees is required to be between 1mm and 1.5mm, and therefore, the excircle fillet RX needs to be measured.
However, the circular arc length of the excircle fillet RX of the part is short, and the thin steel sheet of the R gauge is of a semicircular structure, so that the thin steel sheet cannot be practical with the surface of the part (straight lines at two ends of the fillet RX), and further cannot measure the excircle fillet of the part.
Disclosure of Invention
The invention provides a device and a method for digitally detecting an excircle fillet, which aim to solve the technical problems that an excircle fillet RX of a part is short in arc length, so that the thin steel sheet cannot be practical with the surface of the part, and further cannot be used for measuring the excircle fillet of the part.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the utility model provides a device of digital detection of excircle fillet which characterized in that: comprises a main body and a dial indicator;
the main body is provided with an inclined hole with an included angle of alpha/2 with the horizontal plane and a V-shaped positioning groove positioned at the lower side port of the inclined hole, the angle of the V-shaped positioning groove is alpha, and the angular bisector of the V-shaped positioning groove is superposed with the central line of the inclined hole;
the dial indicator is fixed on the main body, a measuring rod of the dial indicator is arranged in an inclined hole of the main body, and a measuring head at the lower end of the measuring rod extends out of the inclined hole;
the center lines of the measuring rod and the measuring head are superposed with the center line of the inclined hole;
the excircle fillet R of the part to be measured is obtained through the following formula:
in the formula: l is the reading of the dial indicator.
Further, the dial indicator is fixed on the main body through a screw.
Furthermore, an inward concave circular surface for positioning the dial plate of the dial indicator is arranged on the main body.
Meanwhile, the invention provides a method for digitally detecting the excircle fillet, which is characterized in that the device for digitally detecting the excircle fillet comprises the following steps:
1) installation proofreading piece
1.1) placing a proofreading piece on a V-shaped positioning groove of a main body, wherein two outer surfaces of the proofreading piece are in contact with two positioning surfaces of the V-shaped positioning groove;
the calibration piece is a triangular block, and the included angle between the two outer surfaces is equal to the alpha angle of the part to be measured;
1.2) enabling a measuring head of the dial indicator to be in contact with the intersection point of the two outer surfaces of the triangular block, and then zeroing the dial indicator;
2) mounting a part to be tested
2.1) placing the part to be measured on the V-shaped positioning groove of the main body, wherein two outer surfaces of the part to be measured are in contact with two positioning surfaces of the V-shaped positioning groove, and the round angle of the part to be measured is closest to the dial indicator;
2.2) reading the indication number L of the dial indicator;
3) calculating the excircle fillet R of the part to be measured
The excircle fillet R of the part to be measured is obtained through the following formula:
compared with the prior art, the invention has the advantages that:
1. the device and the method convert fillet measurement into measurement of the distance from the circular arc corresponding to the fillet to the vertex of the alpha-degree included angle, and the measurement of the distance is obtained through the dial indicator, so that the measurement mode is simple.
2. The device and the method can measure any excircle fillet through the dial indicator, and have high utilization rate; compared with the conventional measurement mode of R gauge comparison, the method can improve the measurement accuracy by measuring through the dial indicator.
Drawings
FIG. 1 is a schematic diagram of an excircle fillet RX of a flange shaft part of a conventional speed reducer with an included angle of alpha degrees;
FIG. 2 is a schematic diagram illustrating the outer circle fillet digital detection method of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus for digitally detecting a round corner of an outer circle according to the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
wherein the reference numbers are as follows:
1-main body, 11-inclined hole and 12-V-shaped positioning groove;
2-dial indicator, 21-dial plate, 22-measuring rod and 23-measuring head;
3-screw.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 2, the rounded corner RX of fig. 1 is a transition arc defined by a straight line m and a straight line n, and it is known from mathematical knowledge that the center of the rounded corner RX is always on a straight line no matter how the rounded corner RX changes. Based on the principle of mathematical knowledge, the invention expresses the change of the round corner RX through linear change.
Supposing that two round corners are arbitrarily selected, namely a round corner R1 and a round corner R2, and R1 is smaller than R2; the circle center corresponding to the fillet R1 is O1, the radius is R1, the arc corresponding to the fillet R1 is a first arc, the tangent line of the first arc perpendicular to the straight line O1O 2 is a straight line n1, and the shortest distance from the straight line n1 to the intersection point of the straight line m and the straight line n is L1; the circle center corresponding to the fillet R2 is O2, the radius is R2, the arc corresponding to the fillet R2 is a second arc, the tangent line of the second arc perpendicular to the straight line O1O 2 is a straight line n2, and the shortest distance from the straight line n2 to the intersection point of the straight line m and the straight line n is L2;
then, the distance difference Δ L between the straight line n1 and the straight line n2 is calculated by the following formula:
where Δ L is L2-L1 and R2-R1 can be regarded as Δ R, formula (1) can be rewritten as the following formula (2):
deforming equation (2) to obtain the following equation (3):
therefore, the invention can obtain the fillet corresponding to the distance by measuring the shortest distance from the circular arc corresponding to the fillet to the intersection point of the straight line m and the straight line n and according to the linear relation formula from the principle of the linear relation, thereby realizing the measurement of the fillet.
As shown in fig. 3 and 4, the device for digitally detecting the excircle fillet of the invention comprises a main body 1, a dial indicator 2 and a screw 3.
An inclined hole 11 (the angle alpha is known and is determined by a part to be measured) with the included angle alpha/2 with the horizontal plane is arranged on the main body 1, a V-shaped positioning groove 12 is arranged at the lower side port of the inclined hole 11, the angle of the V-shaped positioning groove 12 is alpha, and the angular bisector of the V-shaped positioning groove 12 is superposed with the central line of the inclined hole 11; the 2 positioning surfaces of the V-shaped positioning surface groove are respectively an X surface and a Y surface.
A measuring rod 22 of the dial indicator 2 is arranged in the inclined hole 11 of the main body 1, and a measuring head 23 at the lower end of the measuring rod 22 extends out of the inclined hole 11; the central lines of the measuring rod 22 and the measuring head 23 are superposed with the central line of the inclined hole 11, and after the main body 1 and the dial indicator 2 are matched in a relevant way to determine the position relation, the dial indicator 2 is fixed on the main body 1 through a screw 3.
In order to facilitate the positioning and installation of the dial indicator 2, the main body 1 of the present embodiment is provided with an inner concave circular surface for positioning the dial plate 21 of the dial indicator 2.
The detection process of the device for digitally detecting the excircle fillet comprises the following specific steps:
1) installation proofreading piece
1.1) placing a proofreading piece on a V-shaped positioning groove 12 of a main body 1, wherein two outer surfaces of the proofreading piece are contacted with two positioning surfaces (an X surface and a Y surface) of the V-shaped positioning groove 12;
the calibration piece is a triangular block, and the included angle between the two outer surfaces is equal to the alpha angle of the part to be measured;
1.2) enabling a measuring head 23 of the dial indicator 2 to be in contact with the intersection point of the two outer surfaces of the triangular block, and then zeroing the dial indicator 2;
2) mounting a part to be tested
2.1) placing the part to be measured on the V-shaped positioning groove 12 of the main body 1, wherein two outer surfaces of the part to be measured are contacted with two positioning surfaces (an X surface and a Y surface) of the V-shaped positioning groove 12, and the round angle of the part to be measured is closest to the dial indicator 2;
2.2) reading the indication L of the dial indicator 2;
3) calculating the excircle fillet R of the part to be measured
The excircle fillet R of the part to be measured is obtained through the following formula:
in the formula: and L is the reading of the dial indicator 2 and represents the shortest distance from the circular arc corresponding to the fillet to the intersection point of the straight line m and the straight line n.
This embodiment device is measured the fillet and is converted into the fillet and corresponds the circular arc to the measurement of distance between the alpha degree contained angle summit (the nodical of straight line m and straight line n) to only need to contact the X face and the Y face of main part 1 respectively with the part that awaits measuring on straight line m place plane and the straight line n place plane, after the in close contact with, 2 scale values that the dish pointer of percentage table indicates promptly represent the distance, and then linear relation can obtain fillet R's size, and measuring mode is simple.
The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.
Claims (4)
1. The utility model provides a device that digital detection of excircle fillet which characterized in that: comprises a main body (1) and a dial indicator (2);
the main body (1) is provided with an inclined hole (11) with an included angle of alpha/2 with the horizontal plane and a V-shaped positioning groove (12) positioned at the lower side port of the inclined hole (11), the angle of the V-shaped positioning groove (12) is alpha, and the angular bisector of the V-shaped positioning groove (12) is superposed with the central line of the inclined hole (11);
the dial indicator (2) is fixed on the main body (1), a measuring rod (22) of the dial indicator (2) is arranged in an inclined hole (11) of the main body (1), and a measuring head (23) at the lower end of the measuring rod (22) extends out of the inclined hole (11);
the center lines of the measuring rod (22) and the measuring head (23) are superposed with the center line of the inclined hole (11);
the excircle fillet R of the part to be measured is obtained through the following formula:
in the formula: l is the reading of the dial indicator (2).
2. The apparatus for digitally detecting the fillet of the excircle according to claim 1, wherein: the dial indicator (2) is fixed on the main body (1) through a screw (3).
3. The apparatus for digitally detecting the excircle fillet according to claim 1 or 2, wherein: the main body (1) is provided with an inward concave circular surface for positioning a dial plate (21) of the dial indicator (2).
4. A method for digitally detecting an excircle fillet, which is characterized in that the device for digitally detecting the excircle fillet according to any one of claims 1 to 3 is adopted, and comprises the following steps:
1) installation proofreading piece
1.1) placing a proofreading piece on a V-shaped positioning groove (12) of a main body (1), wherein two outer surfaces of the proofreading piece are contacted with two positioning surfaces of the V-shaped positioning groove (12);
the calibration piece is a triangular block, and the included angle between the two outer surfaces is equal to the alpha angle of the part to be measured;
1.2) enabling a measuring head (23) of the dial indicator (2) to be in contact with the top points of the two outer surfaces of the triangular block, and then zeroing the dial indicator (2);
2) mounting a part to be tested
2.1) placing the part to be tested on the V-shaped positioning groove (12) of the main body (1), wherein two outer surfaces of the part to be tested are in contact with two positioning surfaces of the V-shaped positioning groove (12), and the round angle of the part to be tested is closest to the dial indicator (2);
2.2) reading the indication L of the dial indicator (2);
3) calculating the excircle fillet R of the part to be measured
The excircle fillet R of the part to be measured is obtained through the following formula:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210301544.6A CN114646252A (en) | 2022-03-24 | 2022-03-24 | Device and method for digitally detecting excircle fillet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210301544.6A CN114646252A (en) | 2022-03-24 | 2022-03-24 | Device and method for digitally detecting excircle fillet |
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| CN114646252A true CN114646252A (en) | 2022-06-21 |
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| CN202210301544.6A Pending CN114646252A (en) | 2022-03-24 | 2022-03-24 | Device and method for digitally detecting excircle fillet |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185964A (en) * | 1992-11-04 | 1994-07-08 | Mitsubishi Materials Corp | Out-of-roundness measuring jig |
| CN205102813U (en) * | 2015-11-19 | 2016-03-23 | 苏州工业园区华通科技有限公司 | Axle type part external diameter measuring tool |
| CN111059985A (en) * | 2019-11-21 | 2020-04-24 | 陕西法士特齿轮有限责任公司 | Disc gear spline addendum circle diameter measurement gauge and method |
| CN113432509A (en) * | 2021-06-26 | 2021-09-24 | 长春市春求科技开发有限公司 | R ruler and measuring method |
| CN215338105U (en) * | 2021-06-21 | 2021-12-28 | 苏州英示测量科技有限公司 | Measuring device for measuring arc radius |
-
2022
- 2022-03-24 CN CN202210301544.6A patent/CN114646252A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185964A (en) * | 1992-11-04 | 1994-07-08 | Mitsubishi Materials Corp | Out-of-roundness measuring jig |
| CN205102813U (en) * | 2015-11-19 | 2016-03-23 | 苏州工业园区华通科技有限公司 | Axle type part external diameter measuring tool |
| CN111059985A (en) * | 2019-11-21 | 2020-04-24 | 陕西法士特齿轮有限责任公司 | Disc gear spline addendum circle diameter measurement gauge and method |
| CN215338105U (en) * | 2021-06-21 | 2021-12-28 | 苏州英示测量科技有限公司 | Measuring device for measuring arc radius |
| CN113432509A (en) * | 2021-06-26 | 2021-09-24 | 长春市春求科技开发有限公司 | R ruler and measuring method |
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