CN110608879B - Measuring method of gear parts - Google Patents
Measuring method of gear parts Download PDFInfo
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- CN110608879B CN110608879B CN201810533534.9A CN201810533534A CN110608879B CN 110608879 B CN110608879 B CN 110608879B CN 201810533534 A CN201810533534 A CN 201810533534A CN 110608879 B CN110608879 B CN 110608879B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention provides a method for measuring gear parts, which comprises the steps of firstly scanning a gear shape outline, secondly constructing a theoretical plane, then constructing related gear parameters through the intersection point of the gear line shape outline and the theoretical plane, and obtaining the gear part parameters such as the major diameter, the intermediate diameter and the bottom diameter of a gear by utilizing the technical recombination and the geometric construction principle of the PC-DMIS scanning function, so that the method has the advantages of accurate measurement, simple and convenient operation and low cost, can meet the parameter measurement requirements of developing enterprises on the gear parts, and greatly reduces the measurement cost. The invention solves the problems that in the prior art, in order to ensure the measurement precision, an official professional measurement module and other professional measurement instruments need to be purchased at high price, the dependence on the professional measurement instruments is higher, the operation is relatively complex, and the cost is higher.
Description
Technical Field
The invention relates to the technical field of precision measurement, in particular to a method for measuring gear parts.
Background
Along with the increasing concern of people on product quality and product precision, the precision requirement of more and more modern industrial and mining enterprises on mechanical equipment is correspondingly higher and higher. This forces the production process of the parts to fully consider the design rationality and the processing precision, and pay attention to the low cost and the processing friendliness of the product.
Gears play an important role in the development of industry as basic parts for transmitting motion and power. Due to the high-speed development of the automobile, robot and aerospace industries, the demand of gear products is greatly stimulated, and the rapid growth of the gear manufacturing industry in China is driven. In order to meet the requirement of mass production of high-quality and low-noise gears, the quality control and detection of the gears are very important, and various advanced computer technologies, laser processing technologies, signal processing technologies, image processing technologies and the like are continuously applied to gear measurement, so that the rapid development of the gear measurement technology is promoted.
With the rapid development of the precision manufacturing industry, the size of the gear is smaller and smaller, and the precision requirement is higher and higher. When small and medium-sized industrial enterprises are engaged in development of gear parts, the measurement technology is relatively backward, the parameter measurement of the gear parts is relatively difficult, and the measurement precision and repeatability cannot be ensured. In order to ensure the measurement accuracy, an official professional measurement module and other professional measurement instruments need to be purchased at high price, the dependence on the professional measurement instruments is high, the operation is relatively complex, the requirement on maintenance capacity is high, and the cost is also high.
Disclosure of Invention
The invention provides a method for measuring gear parts, which aims to solve the problems that in the prior art, in order to ensure the measurement precision, official professional measurement modules and other professional measurement instruments need to be purchased at high price, the dependence on the professional measurement instruments is high, the operation is relatively complex and the cost is high.
In order to solve the technical problem, the invention provides a method for measuring gear parts, which comprises the following steps:
step 1, establishing a reference coordinate system and scanning out the linear profile of each gear by open-line scanning;
step 3, connecting the center of each gear contour obtained by open-line scanning with an origin to form a straight line, namely a single-tooth center line;
step 4, rotating each straight line to a shaft in a fixed direction, such as an X shaft, so as to obtain an independent coordinate system, wherein the number of the independent coordinate system is determined according to the number of the gear teeth, and then calculating the distance L at the middle diameter of each gear according to a drawing;
5, constructing theoretical planes A1 and A2 by taking a single-tooth central line as an axis and taking L/2 as a distance for each gear under a current coordinate system to obtain a plurality of theoretical planes;
and 6, intersecting each theoretical plane with the contour line of the open-line scanning to obtain intersection points, and fitting the obtained intersection points into a circle to obtain the gear pitch diameter.
Further, fitting the centers of the gear profiles obtained by the open-line scanning in the step 1 into a circle to obtain the gear major diameter.
Further, in step 5, the theoretical planes are straight lines parallel to the central lines of the single gears, and the total number of the theoretical planes is 2 times of the number of the gears.
The invention has the following beneficial effects: the method for measuring the gear parts, provided by the invention, has the advantages of accurate measurement, simple and convenient operation and low cost, and can meet the parameter measurement requirements of development enterprises on the gear parts, so that medium and small-sized enterprises engaged in the development of the gear parts reduce the high-price purchase of measurement modules of official specialties and other professional measurement instruments, the dependence on the professional measurement instruments and the measurement modules is reduced, and the measurement cost is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a gear structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a measurement scheme according to an embodiment of the invention.
Wherein, 1-gear bottom diameter point, 2-gear outline center, 3-single tooth center line and 4-intersection point.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a gear structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a measurement scheme according to an embodiment of the invention.
The invention provides a measuring method of gear parts, which comprises the following steps:
step 1, establishing a reference coordinate system and scanning out the linear profile of each gear by open-line scanning; and fitting the contour center 2 of each gear obtained by open-line scanning into a circle to obtain the major diameter of the gear.
step 3, connecting the center 2 of each gear contour obtained by open-line scanning with an original point to form a straight line, namely a single-tooth center line 3;
step 4, rotating each straight line to a shaft in a fixed direction, such as an X shaft, so as to obtain an independent coordinate system, wherein the number of the independent coordinate system is determined according to the number of the gear teeth, and then calculating the distance L at the middle diameter of each gear according to a drawing;
5, constructing theoretical planes A1 and A2 by taking a single-tooth central line as an axis and taking L/2 as a distance for each gear under a current coordinate system to obtain a plurality of theoretical planes;
and 6, intersecting each theoretical plane with the contour line of the open-line scanning to obtain an intersection point 4, and fitting the obtained intersection points 4 into a circle to obtain the gear pitch diameter.
In the present embodiment, both the open-line scanning and the center scanning are scanning functions using the PC-DMIS. In the step 5, the theoretical planes are straight lines parallel to the central lines 3 of the single gears, the total number of the theoretical planes is 2 times of the number of the gears, and the number of the intersection points 4 is 2 times of the number of the gears. For example, the number of teeth of the gear shown in fig. 1 is 11, and in the schematic diagram of the measurement scheme shown in fig. 2, the total number of theoretical planes is 22, and the number of intersection points 4 between the theoretical planes and the contour lines of the open-line scan is also 22.
In conclusion, the method for measuring the gear parts provided by the invention obtains the parameters of the gear parts, such as the major diameter, the intermediate diameter and the bottom diameter of the gear, by utilizing the technical recombination and the geometric construction principle of the PC-DMIS scanning function, has the advantages of accurate measurement, simple and convenient operation and low cost, can meet the requirement of development enterprises on the parameter measurement of the gear parts, enables small and medium-sized enterprises engaged in the development of the gear parts to reduce the high-price purchase of measurement modules of official specialties and other professional measurement instruments, reduces the dependence on professional measurement instruments and measurement modules, and greatly reduces the measurement cost.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (3)
1. A method for measuring gear parts is characterized by comprising the following steps:
step 1, establishing a reference coordinate system and scanning out the linear profile of each gear by open-line scanning;
step 2, scanning out each gear bottom diameter point (1) by using center scanning, and fitting all the scanned gear bottom diameter points (1) into a circle to obtain the gear bottom diameter;
step 3, connecting each gear contour center (2) obtained by open-line scanning with an origin to form a straight line, namely a single-tooth center line (3);
step 4, taking a straight line where each single-tooth central line (3) is located as an X axis to obtain an independent coordinate system, determining the number of the independent coordinate system according to the number of the teeth of the gear, and then calculating the distance L of the middle diameter of each single gear according to a drawing;
5, constructing theoretical planes A1 and A2 by taking a single-tooth central line as an axis and taking L/2 as a distance for each gear under a current coordinate system to obtain a plurality of theoretical planes;
and 6, intersecting each theoretical plane with the contour line of the open-line scanning to obtain an intersection point (4), and fitting the obtained intersection points (4) into a circle to obtain the gear pitch diameter.
2. The method for measuring a gear type part according to claim 1, wherein the gear major diameter is obtained by fitting each gear profile center (2) obtained by the open-line scanning in step 1 to a circle.
3. A method for measuring a gear wheel according to claim 1, characterised in that in step 5 the theoretical planes are straight lines parallel to the centre line (3) of each single tooth, the total number of theoretical planes being 2 times the number of teeth of the gear wheel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810533534.9A CN110608879B (en) | 2018-05-29 | 2018-05-29 | Measuring method of gear parts |
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| CN201810533534.9A CN110608879B (en) | 2018-05-29 | 2018-05-29 | Measuring method of gear parts |
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| CN110608879A CN110608879A (en) | 2019-12-24 |
| CN110608879B true CN110608879B (en) | 2021-05-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718624A (en) * | 2009-12-18 | 2010-06-02 | 北京工业大学 | Method and device for measuring errors of face gear by scanning single-face meshed rolling points |
| CN103712567A (en) * | 2013-05-27 | 2014-04-09 | 北京理工大学 | Small module arc gear non-contact optical fine measurement method |
| CN104897397A (en) * | 2015-06-18 | 2015-09-09 | 北京工业大学 | Method of accurately determining assessment domain boundary points in gear global error measurement |
| CN105277165A (en) * | 2015-10-27 | 2016-01-27 | 第一拖拉机股份有限公司 | Tooth surface equal interval sampling method used for improving gear measuring precision |
| CN106556366A (en) * | 2016-11-29 | 2017-04-05 | 哈尔滨精达测量仪器有限公司 | A kind of cylindricality gauge head and measuring method for solving minute gear measurement |
| JP2018040581A (en) * | 2016-09-05 | 2018-03-15 | トーヨーエイテック株式会社 | Master gear for meshing test |
-
2018
- 2018-05-29 CN CN201810533534.9A patent/CN110608879B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718624A (en) * | 2009-12-18 | 2010-06-02 | 北京工业大学 | Method and device for measuring errors of face gear by scanning single-face meshed rolling points |
| CN103712567A (en) * | 2013-05-27 | 2014-04-09 | 北京理工大学 | Small module arc gear non-contact optical fine measurement method |
| CN104897397A (en) * | 2015-06-18 | 2015-09-09 | 北京工业大学 | Method of accurately determining assessment domain boundary points in gear global error measurement |
| CN105277165A (en) * | 2015-10-27 | 2016-01-27 | 第一拖拉机股份有限公司 | Tooth surface equal interval sampling method used for improving gear measuring precision |
| JP2018040581A (en) * | 2016-09-05 | 2018-03-15 | トーヨーエイテック株式会社 | Master gear for meshing test |
| CN106556366A (en) * | 2016-11-29 | 2017-04-05 | 哈尔滨精达测量仪器有限公司 | A kind of cylindricality gauge head and measuring method for solving minute gear measurement |
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| CN110608879A (en) | 2019-12-24 |
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