CN111043937A - Method for detecting a helix angle - Google Patents
Method for detecting a helix angle Download PDFInfo
- Publication number
- CN111043937A CN111043937A CN201911372889.5A CN201911372889A CN111043937A CN 111043937 A CN111043937 A CN 111043937A CN 201911372889 A CN201911372889 A CN 201911372889A CN 111043937 A CN111043937 A CN 111043937A
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- shaft sleeve
- cotton yarn
- sleeve
- cotton
- excircle
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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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- 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
- G01B5/0025—Measuring of vehicle parts
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- Treatment Of Fiber Materials (AREA)
Abstract
The invention discloses a method for detecting a helix angle, which is used for detecting the helix angle on the surface of the excircle of an upper shaft sleeve of a crankshaft pulley and comprises the following steps: horizontally placing the shaft sleeve; sleeving annular cotton yarns on the excircle of the shaft sleeve, and hanging a hanger with a certain weight on the cotton yarns; recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the initial position of the cotton yarn; rotating the shaft sleeve for several circles, so that the cotton yarn moves along the axial direction of the shaft sleeve, and recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the termination position of the cotton yarn; according to the formula
Calculating a helix angle on the excircle of the shaft sleeve, wherein LA is the helix angle, SA is the axial moving distance of the cotton yarn, and SC is the outer part of the shaft sleeveAnd the circumference is NR, and the NR is the number of rotations of the shaft sleeve. The method has simple detection process and accurate measurement result.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method for detecting a helix angle.
Background
The automobile crankshaft pulley assembly is usually arranged at the front end of an engine crankshaft and mainly used for driving other accessories, inhibiting or eliminating torsional vibration of the crankshaft and reducing vibration and noise of the whole automobile.
As shown in fig. 1, a portion of the pulley has a rotary seal face which is typically in the form of a sleeve 1 (i.e. the outer circumferential surface of the sleeve 1 is the rotary seal face). In an ideal state, the rotary sealing surface is smooth, and the roughness grade of the rotary sealing surface is high so as to ensure the oil sealing effect after the rotary sealing surface is matched with the sealing ring. However, in actual surface machining processes, the relative axial movement of the machining tools (grinding wheels, sanding belts, lathes) creates a helical groove in the shaft surface, i.e., a shaft helix angle. The shaft helix angle influences the sealing performance of the radial lip matching oil seal, and if the deviation between the actual angle after the shaft helix angle is processed and the design value is too large, the helix texture structure of the shaft helix angle structure can possibly cause the working medium in the inner cavity of a power assembly product to leak, thereby causing quality hidden trouble.
At present, the angle of the spiral line cannot be detected by general size detection, or the detected angle is not accurate.
Disclosure of Invention
To overcome the defects in the prior art, the embodiments of the present invention provide a method for detecting a helix angle, which provides a simple and accurate method for measuring the helix angle of a helix.
The embodiment of the application discloses: a method for detecting a lead angle of an outer circumferential surface of an upper sleeve of a crank pulley, comprising the steps of:
horizontally placing the shaft sleeve;
sleeving annular cotton yarns on the excircle of the shaft sleeve, and hanging a hanger with a certain weight on the cotton yarns;
recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the initial position of the cotton yarn;
rotating the shaft sleeve for several circles, so that the cotton yarn moves along the axial direction of the shaft sleeve, and recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the termination position of the cotton yarn;
according to the formula
Calculating the helix angle of the spiral groove, wherein LA is spiralAnd rotating the angle of the lift angle, wherein SA is the moving distance of the cotton yarn along the axis, SC is the outer circumference of the shaft sleeve, and NR is the number of rotating turns of the shaft sleeve.
Specifically, the step of horizontally placing the shaft sleeve comprises the following steps: the shaft sleeve is fixedly arranged on a tool, the tool is fixed on a detector, the included angle between the axis of the shaft sleeve and the horizontal direction is between 0 +/-15', and the jumping quantity of the outer diameter of the shaft sleeve is smaller than 0.5mm when the shaft sleeve rotates.
Specifically, after the step "install axle sleeve fixed mounting at the frock, will the frock is fixed on the detector", still include: the detector is placed on a projection measuring instrument, and the level is adjusted, so that the included angle between the axis of the shaft sleeve and the horizontal direction is 0 +/-15', and the jumping quantity of the outer diameter of the shaft sleeve is less than 0.5mm when the shaft sleeve rotates.
Specifically, the detector comprises a motor for driving the tool to rotate.
Specifically, the rotation speed of the motor during detection is between 60 +/-5 rpm.
Specifically, the diameter of the cotton yarn is 0.23 mm.
Specifically, the contact arc between the cotton yarn and the excircle of the shaft sleeve is 220-240 degrees.
Specifically, the suspension is a 30g weight.
Specifically, before the step of "placing the shaft sleeve horizontally", the method further includes: cleaning the outer circle surface of the shaft sleeve, and smearing silicon oil on the cleaned outer circle surface of the shaft sleeve, wherein the viscosity of the silicon oil is 5-10 cps.
Specifically, the repeated use times of each cotton yarn is less than or equal to 5 times.
The invention has at least the following beneficial effects:
1. the measuring method is simple and low in cost, the labor intensity and complexity of measuring personnel can be reduced, and the measuring precision can be improved.
2. The projection measuring instrument is adopted to monitor the movement of the cotton yarn in the whole measuring process, the size to be detected can be enlarged, and the measuring accuracy is improved.
3. The spiral lead angle numerical value of the outer circle surface of the shaft sleeve can be quantitatively obtained to judge whether machining of the outer circle surface of the shaft sleeve is qualified or not, whether oil leakage can be generated or not in the follow-up process matched with the sealing ring to cause failure of an oil seal can be pre-judged through the spiral lead angle numerical value, the spiral line direction of the outer circle surface of the shaft sleeve can be qualitatively detected, and quality control of products is facilitated.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a pulley having a rotary seal face;
FIG. 2 is a schematic structural diagram of the bushing after being clamped according to the embodiment of the invention;
FIG. 3 is a diagram illustrating parameters in a calculation formula according to an embodiment of the present invention.
Reference numerals of the above figures: 1. a shaft sleeve; 2. cotton yarn; 3. a suspension; 4. and (5) assembling.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2, the method for detecting the lead angle provided in the present embodiment can be used to detect the lead angle of the outer circumferential surface of the sleeve 1 on the cranking pulley. Specifically, in an ideal state, in order to ensure an oil sealing effect when the shaft sleeve 1 is matched with the sealing ring, the outer surface of the shaft sleeve 1 is smooth, and the surface roughness level of the shaft sleeve 1 is as high as possible. However, in the actual machining process, after the cutting tool is machined, the surface of the shaft sleeve 1 inevitably generates some fine spiral grooves which are usually invisible to naked eyes, but the fine spiral grooves may also have adverse effects on the oil sealing action of the shaft sleeve 1, so that it is necessary to measure the spiral rising angle of the fine spiral grooves on the shaft sleeve 1 by a specific method to determine whether the machining of the shaft sleeve 1 is qualified.
The method comprises the following steps:
first, the sleeve 1 is horizontally placed.
Then, the annular cotton yarn 2 is sleeved on the excircle of the shaft sleeve 1, and a suspension 3 with certain weight is suspended on the cotton yarn 2. Preferably, the suspension 3 can be a weight with a weight of 30g, and the suspension 3 with the weight can not only enable the cotton yarn 2 and the spiral groove on the excircle of the shaft sleeve 1 to generate a certain interaction force, but also avoid the overlarge interaction force, so as to ensure the accuracy of measurement.
Next, the axial position of the cotton thread 2 relative to the sleeve 1 is recorded, which is the starting position of the cotton thread 2.
Next, the sleeve 1 is rotated several turns (for example, 60 turns) so that the cotton thread 2 moves in the axial direction of the sleeve 1, and the axial position of the cotton thread 2 with respect to the sleeve 1, which is the end position of the cotton thread 2, is recorded, and from the end position and the start position, the moving distance of the cotton thread 2 in the axial direction when the sleeve 1 rotates can be calculated.
Next, as shown in FIG. 3, according to the formula
Calculating a helix angle on the excircle of the shaft sleeve 1, wherein LA is the helix angle, SA is the moving distance of the cotton yarn 2 on the shaft sleeve 1 along the axial direction, and SC is the outside of the shaft sleeve 1Circumference (because the spiral groove on the surface of the outer circle of the shaft sleeve 1 is very small and almost invisible to naked eyes, the diameters of the middle circle and the outer circle of the spiral groove are not greatly different, for convenience of calculation, SC can be the outer circumference of the spiral groove, namely the outer circumference of the shaft sleeve 1), and NR is the number of turns of the shaft sleeve 1.
It should be noted that, in the above method, the shaft sleeve 1 may be rotated in a clockwise direction or a counterclockwise direction, so that the direction of the spiral line on the outer circle of the shaft sleeve 1 may be determined according to the rotation direction of the shaft sleeve 1 and the movement condition of the cotton yarn 2. If the cotton yarn 2 keeps the initial position and does not generate displacement no matter the shaft sleeve 1 rotates clockwise or anticlockwise, the fact that no spiral line exists at the position on the shaft sleeve 1 is indicated, namely the machining effect at the position is good.
Specifically, in the step "place the axle sleeve 1 horizontally", the step may further include fixedly mounting the axle sleeve 1 on a tool 4, fixing the tool 4 matched with the axle sleeve 1 on a detector, then, placing the detector on a projection measuring instrument, and adjusting the level, so that an included angle between the axis of the axle sleeve 1 and the horizontal direction is between 0 ± 15', and a runout of the outer diameter of the axle sleeve 1 during rotation thereof is less than 0.5 mm. Further, the detector may further include a motor for driving the tool 4 to rotate, and during detection, the rotation speed of the motor is between 60 ± 5 rpm.
By adopting the scheme, the shaft sleeve 1 is fixed through the tool 4, and the detector is used for clamping the tool 4, so that the parallelism between the shaft sleeve 1 and a horizontal plane can be ensured when the shaft sleeve 1 is detected, the runout quantity of the outer diameter of the shaft sleeve 1 can be controlled within a small range when the shaft sleeve rotates, and the detection accuracy is ensured. In addition, the detector is placed on the projection measuring instrument for measurement, the size to be detected can be enlarged, the problem of inaccurate measurement is solved, and the measurement precision is improved.
Specifically, the thread diameter of the cotton yarn 2 sleeved on the shaft sleeve 1 is preferably 0.23mm, because the accuracy of movement of the cotton yarn 2 on the surface of the workpiece is affected by the fact that the thread diameter is too large or too small relative to the roughness of the surface of the workpiece. The length of cotton yarn 2 can be decided according to the demand, and the preferred, the contact arc that cotton yarn 2 and axle sleeve 1 excircle should be satisfied to the length of cotton yarn 2 is between 220 ~ 240 to ensure measured data's accuracy, reduce measuring error. Further, each cotton yarn 2 is reused no more than 5 times to reduce measurement errors. Before the cotton yarn 2 is used, whether the surface of the cotton yarn has visible defects such as scratches, notches, salient points and the like can be observed by using a magnifying glass, and if the defects exist, the cotton yarn cannot be used for measurement.
Specifically, before the step "place the shaft sleeve 1 horizontally", the method further includes: cleaning the outer circle surface of the shaft sleeve 1, and smearing silicon oil on the cleaned outer circle surface of the shaft sleeve 1, wherein the viscosity of the silicon oil is 5-10 cps. Silicon oil is smeared on the surface of the outer circle of the shaft sleeve 1, so that the smoothness of movement of the cotton yarn 2 can be ensured, and the error of movement of the cotton yarn 2 is reduced.
In summary, the method provided in this embodiment has the following advantages:
1. the measuring method is simple and low in cost, the labor intensity and complexity of measuring personnel can be reduced, and the measuring precision can be improved.
2. The projection measuring instrument is adopted to monitor the movement of the cotton yarn 2 in the whole measuring process, the size to be detected can be enlarged, and the measuring accuracy is improved.
3. The spiral lead angle numerical value of the outer circle surface of the shaft sleeve 1 can be quantitatively obtained to judge whether machining of the outer circle surface of the shaft sleeve 1 is qualified or not, whether oil leakage can be generated or not in the follow-up process matched with the sealing ring to cause failure of an oil seal can be pre-judged through the spiral lead angle numerical value, the spiral line direction of the outer circle surface of the shaft sleeve 1 can be qualitatively detected, and quality control of products is facilitated.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for detecting a lead angle of an outer circumferential surface of an upper sleeve of a crank pulley, comprising the steps of:
horizontally placing the shaft sleeve;
sleeving annular cotton yarns on the excircle of the shaft sleeve, and hanging a hanger with a certain weight on the cotton yarns;
recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the initial position of the cotton yarn;
rotating the shaft sleeve for several circles, so that the cotton yarn moves along the axial direction of the shaft sleeve, and recording the axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the termination position of the cotton yarn;
according to the formula
And calculating a helix angle on the excircle of the shaft sleeve, wherein LA is the helix angle, SA is the axial movement distance of the cotton yarn, SC is the outer circumference of the shaft sleeve, and NR is the number of revolutions of the shaft sleeve.
2. The method of claim 1, wherein the step of "placing the sleeve horizontally" comprises: the shaft sleeve is fixedly arranged on a tool, the tool is fixed on a detector, the included angle between the axis of the shaft sleeve and the horizontal direction is between 0 +/-15', and the jumping quantity of the outer diameter of the shaft sleeve is smaller than 0.5mm when the shaft sleeve rotates.
3. The method of claim 2, wherein after the step of "fixedly mounting the sleeve on a tool and fixing the tool on a testing machine", further comprising: the detector is placed on a projection measuring instrument, and the level is adjusted, so that the included angle between the axis of the shaft sleeve and the horizontal direction is 0 +/-15', and the jumping quantity of the outer diameter of the shaft sleeve is less than 0.5mm when the shaft sleeve rotates.
4. The method of claim 2, wherein the inspection apparatus includes a motor for driving the tool in rotation.
5. The method of claim 4, wherein the motor is detected at a speed of between 60 ± 5 rpm.
6. The method of claim 1, wherein the cotton yarn has a yarn diameter of 0.23 mm.
7. The method according to claim 1, wherein the contact arc of the cotton yarn and the excircle of the shaft sleeve is between 220 and 240 degrees.
8. The method of claim 1, wherein the suspension is a 30g weight.
9. The method of claim 1, further comprising, prior to said step of "placing the sleeve horizontally": cleaning the outer circle surface of the shaft sleeve, and smearing silicon oil on the cleaned outer circle surface of the shaft sleeve, wherein the viscosity of the silicon oil is 5-10 cps.
10. The method of claim 1, wherein each of said cotton yarns is reused less than or equal to 5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911372889.5A CN111043937A (en) | 2019-12-27 | 2019-12-27 | Method for detecting a helix angle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911372889.5A CN111043937A (en) | 2019-12-27 | 2019-12-27 | Method for detecting a helix angle |
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| CN111043937A true CN111043937A (en) | 2020-04-21 |
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| CN201911372889.5A Pending CN111043937A (en) | 2019-12-27 | 2019-12-27 | Method for detecting a helix angle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902807A (en) * | 2021-01-14 | 2021-06-04 | 富通集团（天津）超导技术应用有限公司 | Cable helix angle measuring device and measuring method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1093165B (en) * | 1977-03-08 | 1985-07-19 | Nippon Oil Seal Ind Co Ltd | METHOD FOR MEASURING THE DIRECTIONAL PROPERTIES OF THE TREE SURFACE |
| CN1045241A (en) * | 1989-03-03 | 1990-09-12 | 周知 | The design of large diameter worm and worm gear and the method for rolling cut |
| CN1045446A (en) * | 1989-03-03 | 1990-09-19 | 周知 | Large-diameter oil culvert worm gear pair |
| CN203629788U (en) * | 2013-12-28 | 2014-06-04 | 山西长城微光器材股份有限公司 | Hard fiber product image displacement detecting device |
| CN204043828U (en) * | 2014-08-18 | 2014-12-24 | 杭州富春弹簧有限公司 | The torsion-testing assembled tool of anti-push type expansion tightening wheel torsionspring |
| CN107084658A (en) * | 2017-03-01 | 2017-08-22 | 浙江兆丰机电股份有限公司 | The fine spiral lamination measuring method of outer round surface |
| CN107478142A (en) * | 2017-09-12 | 2017-12-15 | 上汽依维柯红岩车桥有限公司 | Method for detecting oil seal seat crudy |
-
2019
- 2019-12-27 CN CN201911372889.5A patent/CN111043937A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1093165B (en) * | 1977-03-08 | 1985-07-19 | Nippon Oil Seal Ind Co Ltd | METHOD FOR MEASURING THE DIRECTIONAL PROPERTIES OF THE TREE SURFACE |
| CN1045241A (en) * | 1989-03-03 | 1990-09-12 | 周知 | The design of large diameter worm and worm gear and the method for rolling cut |
| CN1045446A (en) * | 1989-03-03 | 1990-09-19 | 周知 | Large-diameter oil culvert worm gear pair |
| CN203629788U (en) * | 2013-12-28 | 2014-06-04 | 山西长城微光器材股份有限公司 | Hard fiber product image displacement detecting device |
| CN204043828U (en) * | 2014-08-18 | 2014-12-24 | 杭州富春弹簧有限公司 | The torsion-testing assembled tool of anti-push type expansion tightening wheel torsionspring |
| CN107084658A (en) * | 2017-03-01 | 2017-08-22 | 浙江兆丰机电股份有限公司 | The fine spiral lamination measuring method of outer round surface |
| CN107478142A (en) * | 2017-09-12 | 2017-12-15 | 上汽依维柯红岩车桥有限公司 | Method for detecting oil seal seat crudy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902807A (en) * | 2021-01-14 | 2021-06-04 | 富通集团（天津）超导技术应用有限公司 | Cable helix angle measuring device and measuring method |
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Application publication date: 20200421 |
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