CN114046919B - Method for measuring torsion angle and torque relation of rectangular-section torsion spring - Google Patents
Method for measuring torsion angle and torque relation of rectangular-section torsion spring Download PDFInfo
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- CN114046919B CN114046919B CN202111314804.5A CN202111314804A CN114046919B CN 114046919 B CN114046919 B CN 114046919B CN 202111314804 A CN202111314804 A CN 202111314804A CN 114046919 B CN114046919 B CN 114046919B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 241000692870 Inachis io Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a method for measuring the relation between torsion angle and torque of a torsion spring with a rectangular section, which comprises the following steps: firstly, mounting a torsion spring with a rectangular section to be tested on a tool, and connecting the tool to a torsion testing machine; second, determining a preset torque T 0 The method comprises the steps of carrying out a first treatment on the surface of the Preset torque T 0 For Tmin < T 0 < Tmax. Third, according to the torsion speed of 0.03-0.5 rad/min, the torque is T 0 To begin application, until the opposite ends of the spring are twisted to a target angle, at which point the torque is T 1 The torque measurement value of the final target angle is t=t 1 ‑T 0 . The invention fills the blank of the torsion angle-torque relation measuring method for the torsion spring with the rectangular cross section, avoids the torsion spring from testing in the initial unstable state, and ensures the accuracy and repeatability of the detection result.
Description
Technical Field
The invention belongs to the technical field of metering, and particularly relates to a method for measuring the relation between torsion angle and torque of a torsion spring with a rectangular section.
Background
A rectangular section torsion spring is an elastic component. The torsion spring is a short name of torsion spring, which belongs to a kind of spiral spring. A coil spring is an accumulator that has the function of storing energy, but does not slowly release the energy, but rather is implemented by a "spring + torsion mechanism". The principle is to fix the two ends of the torsion spring to the other components, which spring returns them to their original position when they rotate around the spring neutral line, thereby generating torque.
At present, the measurement of the torsion angle and the torque relation of a spring does not have unified measurement standard, a method for measuring a metal material is generally adopted, and in the existing torsion test method, the torque is applied to the metal material until the metal material breaks, and the torque or the torsion angle is measured. The test purpose is different from the test purpose of measuring the torsion angle-torque relation of the torsion spring with the rectangular cross section, namely the influence of the starting point on the result is ignored. The rectangular section spring is an elastic part, and is twisted to a certain angle according to the process requirement, and the process performance and the use evaluation of the rectangular section spring are measured, so that the conventional measuring method is not applicable.
The test process and the method of the elastic part are not explicitly guided and unified, only the product requirement is specified in the design drawing, and the torsion test process is not particularly required. The test standard method aiming at the torsion spring is not adopted at the present stage, so that the repeatability of test results is low, the judgment of the edge value is obviously influenced, and the phenomena of inaccurate measured data, non-uniform starting and measuring points and the like are caused. Meanwhile, at present, no corresponding detection process basis and method guidance of the torsion spring with the rectangular section exist, so that the influence of factors such as subjective judgment factors observed by people and gaps of a clamping device is firstly influenced, the determination of a starting point is firstly influenced, and the test result has large discreteness and poor repeatability.
Disclosure of Invention
The invention aims to provide a method for measuring the torsion angle and torque relation of a rectangular section torsion spring, which fills the blank of the method for measuring the torsion angle and torque relation of the rectangular section torsion spring, avoids the torsion spring from testing in an initial unstable state, more accurately measures the torsion angle and torque relation of the torsion spring, and ensures the accuracy and repeatability of the detection result of the parts. The test detection level of the torsion spring with the rectangular cross section is improved.
The technical scheme of the invention is that the method for measuring the torsion angle and the torque relation of the torsion spring with the rectangular section comprises the following steps:
firstly, mounting a torsion spring with a rectangular section to be tested on a tool, and connecting the tool to a torsion testing machine;
second, determining a preset torque T 0 The method comprises the steps of carrying out a first treatment on the surface of the Preset torque T 0 Is T min T 0 T max
Minimum value T of the preset torque min The determining method comprises the following steps: performing three pretwisting, wherein each pretwisting angle is one third of the target angle, acquiring torque and angle values in real time, and determining a torque and angle value relation curve according to the acquired torque and angle values, wherein the maximum torque of the elastic section in the relation curve is the minimum value T min
Preset torque maximum T max According to the determination of the formula (1),
e, elastic modulus with the unit of GPa;
a, the section width of the torsion spring with a rectangular section is in mm;
b, the section thickness of the torsion spring with the rectangular section is in mm;
the safe torsion angle in degrees, the spring limit angle of 70%;
alpha is a target angle in degrees;
D 2- the external diameter of the torsion spring is in mm;
n-the number of work turns of the torsion spring;
third, according to the torsion speed of 0.03-0.5 rad/min, the torque is T 0 To begin application, until the opposite ends of the spring are twisted to a target angle, at which point the torque is T 1 The torque measurement value of the final target angle is t=t 1 -T 0
The tool comprises a left chuck 1, an angle disc 2, a core rod 4 and a right chuck 5, wherein a torsion spring 3 with a rectangular section to be measured is sleeved on the periphery of the core rod 4, two ends of the core rod 4 are respectively fixed on the left chuck 1 and the right chuck 5, and the angle disc 2 is fixed on the surface of the middle shoulder of the left chuck 1.
The method has the beneficial effects that peacock with a rectangular section torsion spring preset torque test method is filled, a method for determining a preset torque starting point is provided, and the repeatability of the torque-torsion angle relation result is controlled to be +/-1% when the same torsion spring is subjected to repeated test according to a specified test angle; the invention is mainly used for determining the starting point and measuring the torsion angle-torque relation of the torsion spring with the rectangular section and similar products, can also be used as a reference in the torsion test of the torsion-type elastic element at the elastic stage, and solves the difficulty of the detection method of the torsion spring with the rectangular section.
Drawings
FIG. 1 is a schematic diagram of a torsion spring and tooling assembly structure in a method for determining torsion angle and torque relationship of a rectangular section torsion spring according to the present invention;
FIG. 2 is a graph showing torque angle versus torque according to the present invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings.
The test method for measuring the torsion angle and the torque relation of the torsion spring with the rectangular section comprises the following steps:
the first step, the torsion spring with the rectangular section to be tested and the tool are lubricated, then the torsion spring with the rectangular section to be tested is installed on the tool, and then the tool is connected to a torsion testing machine.
As shown in fig. 1, the tooling comprises a left chuck 1, an angle scale 2, a core rod 4 and a right chuck 5. The torsion spring 3 with the rectangular section to be tested is sleeved on the periphery of the core rod 4, two ends of the core rod 4 are respectively fixed on the left chuck 1 and the right chuck 5, and the angle scale 2 is fixed on the surface of the middle shoulder of the left chuck 1.
Second, determining a preset torque T 0 Starting and measuring point, preset torque T 0 The torque of the starting point is the torque of the starting point.
Preset torque T 0 Is T min T 0 T max
As shown in fig. 2, the minimum value T of the preset torque min The determining method comprises the following steps: selecting a preset torque starting point of the torsion spring by adopting a method of not less than three times of pre-torsion tests, namely selecting three times of pre-torsion, wherein each pre-torsion angle is one third of a target angle, acquiring torque and angle values in real time, determining a relation curve of the torque and the angle values, and taking the maximum torque of the elastic section in the relation curve as a minimum value T of the preset torque min Thereby avoiding the influence of the initial effect, which is the part between the origin of the torsion angle-torque curve and the curve becoming a linear relation.
Preset torque maximum T max The measuring method comprises the following steps: in order to ensure that the preset torque and the test torque cannot generate plastic deformation after being overlapped, the total torque cannot exceed the maximum allowable torque of the torsion spring with the rectangular section, so that the maximum value T of the preset torque max The measurement method is determined by using formula 1.
Wherein T is 0 -preset torque (Nm);
T min -preset torque minimum (Nm);
T max -preset torque maximum (Nm);
e-elastic modulus (GPa);
a-rectangular section torsion spring section width (mm);
b-rectangular section torsion spring section thickness (mm);
the safe torsion angle (degrees), taking the torsion spring elastic limit angle 70%;
alpha-target angle (degrees);
D 2- -torsion spring outer diameter (mm);
n-the number of work turns of the torsion spring.
Third, according to the torsion speed of 0.03-0.5 rad/min, the torque is T 0 To begin application, until the opposite ends of the spring are twisted to a target angle, at which point the torque is T 1 The torque measurement value of the final target angle is t=t 1 -T 0
The key point of the invention is to determine the range of the preset torque interval, namely, how to avoid the influence of the initial effect, and the lubrication of the contact part between the torsion spring with the rectangular section to be tested and the tool is a necessary means in the test process.
Claims (1)
1. A method for measuring the relation between torsion angle and torque of a torsion spring with a rectangular section is characterized by comprising the following steps: the measuring method comprises the following steps:
firstly, mounting a torsion spring with a rectangular section to be tested on a tool, and connecting the tool to a torsion testing machine;
second, determining a preset torque T 0 The method comprises the steps of carrying out a first treatment on the surface of the Preset torque T 0 Is T min T 0 T max
Minimum value T of the preset torque min The determining method comprises the following steps: performing three pretwisting, wherein each pretwisting angle is one third of the target angle, and acquiring torque and angle values in real time according to the acquired torque and angle valuesThe torque and angle values are taken to determine a torque and angle value relation curve, wherein the maximum torque of the elastic section is the minimum value T min
Preset torque maximum T max According to the determination of the formula (1),
e, elastic modulus with the unit of GPa;
a, the section width of the torsion spring with a rectangular section is in mm;
b, the section thickness of the torsion spring with the rectangular section is in mm;
the safe torsion angle in degrees, the spring limit angle of 70%;
alpha is a target angle in degrees;
D 2 the external diameter of the torsion spring is in mm;
n-the number of work turns of the torsion spring;
third, according to the torsion speed of 0.03-0.5 rad/min, the torque is T 0 To begin application, until the opposite ends of the spring are twisted to a target angle, at which point the torque is T 1 The torque measurement value of the final target angle is t=t 1 -T 0
The tool comprises a left chuck (1), an angle disc (2), a core rod (4) and a right chuck (5), wherein a torsion spring (3) with a rectangular section to be measured is sleeved on the periphery of the core rod (4), two ends of the core rod (4) are respectively fixed on the left chuck (1) and the right chuck (5), and the angle disc (2) is fixed on the surface of the middle shoulder of the left chuck (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111314804.5A CN114046919B (en) | 2021-11-08 | 2021-11-08 | Method for measuring torsion angle and torque relation of rectangular-section torsion spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111314804.5A CN114046919B (en) | 2021-11-08 | 2021-11-08 | Method for measuring torsion angle and torque relation of rectangular-section torsion spring |
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| Publication Number | Publication Date |
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| CN114046919A CN114046919A (en) | 2022-02-15 |
| CN114046919B true CN114046919B (en) | 2024-04-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105252227A (en) * | 2015-11-23 | 2016-01-20 | 航天科工哈尔滨风华有限公司 | Manufacturing process capable of improving stability of torsion bar spring |
| CN108827618A (en) * | 2018-07-26 | 2018-11-16 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of rectangular section torsionspring durability test method |
| CN109100244A (en) * | 2018-07-26 | 2018-12-28 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of aircraft torsionspring choosing ginseng test method |
| CN110542522A (en) * | 2018-05-29 | 2019-12-06 | 中国科学院金属研究所 | dynamic test method for stress relaxation of torsion spring |
| CN112032230A (en) * | 2020-09-10 | 2020-12-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for determining performance of torsion spring with rectangular section |
-
2021
- 2021-11-08 CN CN202111314804.5A patent/CN114046919B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105252227A (en) * | 2015-11-23 | 2016-01-20 | 航天科工哈尔滨风华有限公司 | Manufacturing process capable of improving stability of torsion bar spring |
| CN110542522A (en) * | 2018-05-29 | 2019-12-06 | 中国科学院金属研究所 | dynamic test method for stress relaxation of torsion spring |
| CN108827618A (en) * | 2018-07-26 | 2018-11-16 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of rectangular section torsionspring durability test method |
| CN109100244A (en) * | 2018-07-26 | 2018-12-28 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of aircraft torsionspring choosing ginseng test method |
| CN112032230A (en) * | 2020-09-10 | 2020-12-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for determining performance of torsion spring with rectangular section |
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