CN108956344B - Rubber forming sheet metal part fatigue test device and test method - Google Patents
Rubber forming sheet metal part fatigue test device and test method Download PDFInfo
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- CN108956344B CN108956344B CN201810366710.4A CN201810366710A CN108956344B CN 108956344 B CN108956344 B CN 108956344B CN 201810366710 A CN201810366710 A CN 201810366710A CN 108956344 B CN108956344 B CN 108956344B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a rubber forming sheet metal part fatigue test device and a test method. The motor is started to drive the eccentric wheel to rotate, the eccentric wheel performs reciprocating motion, periodic alternating stress acts on the square clamp, the square clamp applies the periodic alternating stress on the sheet metal part to be tested, after the sheet metal part to be tested is subjected to fatigue fracture, the motor is turned off, and the number of turns displayed by the number-of-turns counter is read, namely the fatigue life of the sheet metal part to be tested. The loading force can be adjusted by adjusting the size of the eccentric wheel or adjusting the stiffness coefficient of the spring. Meanwhile, the telescopic clamp and the square clamp can be adjusted in position according to the size of the sheet metal part to be measured.
Description
Technical Field
The invention relates to the technical field of test measurement, in particular to a rubber forming sheet metal part fatigue test device and a test method.
Background
The large airplane is a landmark project in the manufacturing industry, the outer shell of the large airplane is formed by combining the fuselage and the wings, and the fuselage and the wings comprise a large number of sheet metal parts. Rubber forming is widely applied to the manufacturing of airplane sheet metal parts, and safety is a main performance index of airplanes. The aircraft mainly depends on the lift force generated by the wings when flying in the air, the parts are in a high stress state for a long time, the damage of the parts is mainly fatigue damage, and the fatigue performance is one of the main performances of the aircraft sheet metal parts. At present, the fatigue performance of an airplane sheet metal part is measured less and mainly depends on experience and strength design. The sheet metal component is in the rubber forming process, takes place plastic damage easily, and especially some parts need adopt manual school shape because can not reach the precision, and the manual forming in-process can produce certain damage to the fatigue of sheet metal component, but damage is big, is an unknown number at present. The rubber forming sheet metal part mainly comprises a straight bent edge, a convex bent edge, a concave bent edge and a complex bent edge, and how to measure the fatigue strength of various bent edge parts is a difficult problem. The measurement is difficult to carry out by adopting some conventional fatigue testing machines, and mainly the clamping, the alignment and the loading of the sheet metal parts are difficult.
Chinese patent publication No. CN 102706759B, published 2015, 1 month and 7 days, entitled "a bending fatigue testing machine" is mainly used for measuring the fatigue performance of a bent part, and has the disadvantages that: the fatigue performance of the sheet metal part cannot be measured, and the load cannot be adjusted, so that the fatigue performance of the sheet metal part under different loads cannot be measured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a fatigue testing device and a fatigue testing method for a sheet metal part formed by rubber, which can adjust the test load, test different types of sheet metal parts and are simple to operate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rubber forming sheet metal part fatigue test device is characterized by comprising a square clamp, a telescopic clamp, a loading bolt and a box body, wherein a transmission shaft penetrating through the box body is arranged on the box body, and an eccentric wheel capable of axially sliding along the transmission shaft is sleeved on the transmission shaft; a limiting groove is formed in the inner surface of the box body; the limiting groove is provided with a square clamp, and the square clamp is connected with the limiting groove in a sliding manner; the square clamp is provided with a through cavity, the upper surface of the square clamp is provided with a through hole in the vertical direction, and the through hole is in threaded connection with the loading bolt; a nut is arranged on the upper surface of the cavity and connected with the loading bolt; the upper surface of the loading bolt is tightly attached to the eccentric wheel, a spring is sleeved on the loading bolt, a pressure sensor is arranged between the spring and the loading bolt, the upper end of the spring is tightly attached to the pressure sensor, and the lower end of the spring is tightly attached to the upper surface of the square clamp; the telescopic clamp is arranged at the bottom of the box body. The eccentric wheel rotates to periodically apply a loading force to the loading bolt, the spring and the pressure sensor can visually reflect the applied periodic loading force on a computer, and the loading force can be adjusted by adjusting the size of the eccentric wheel or adjusting the stiffness coefficient of the spring. Meanwhile, the telescopic clamp and the square clamp can be adjusted in position according to the size of the sheet metal part.
Preferably, the lower surface of the square clamp is provided with a plurality of threaded holes in the vertical direction, and the telescopic clamp is provided with a plurality of threaded holes in the transverse direction. The sheet metal part to be measured can be effectively and stably fixed during testing, and measuring errors are reduced.
Preferably, the side face of the telescopic clamp, which is attached to the sheet metal part to be tested, is a straight face or a concave face. The sheet metal component crimp is straight crimp or protruding crimp usually, and scalable anchor clamps can carry out the cooperation of straight face or curved surface according to the condition.
Preferably, one end of the transmission shaft is connected with the motor, and the other end of the transmission shaft is connected with the circle number counter.
A testing method of a rubber forming sheet metal part fatigue testing device is characterized in that one side of a sheet metal part to be tested is connected with a square clamp through a bolt, the other side of the sheet metal part to be tested is connected with a telescopic clamp through a bolt, and a fixing gasket is arranged at the joint of the bolt and the sheet metal part to be tested in a stacking mode.
Preferably, the eccentric wheel rotates one circle, the reading of the pressure sensor is read, and the magnitude of the loading force is adjusted by adjusting the stiffness coefficient of the spring so as to meet the requirement of the fatigue testing force.
Preferably, the magnitude of the loading force is adjusted by adjusting and changing the magnitude of the eccentric wheel.
Preferably, the motor is started to drive the eccentric wheel to rotate, the eccentric wheel reciprocates to act on the square clamp, the square clamp applies periodic alternating stress to the sheet metal part to be tested, after the sheet metal part to be tested is subjected to fatigue fracture, the motor is turned off, and the number of turns displayed by the number-of-turns counter is read, namely the fatigue life of the sheet metal part to be tested.
The invention has the beneficial effects that: (1) the structure is simple, and the operation is convenient; (2) the loading force is adjustable; (3) the position or the shape of the sheet metal part can be adjusted according to different sizes and structures.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a sheet metal part to be measured with straight and curved edges;
FIG. 3 is a schematic diagram of clamping a sheet metal part to be measured with straight and bent edges;
FIG. 4 is a schematic view of a sheet metal part to be tested with a convex curved edge;
fig. 5 is a schematic view of clamping a sheet metal part to be measured with a convex curved edge.
In the figure: the device comprises a motor 1, a box body 2, a transmission shaft 3, an eccentric wheel 4, a turn number counter 5, a loading bolt 6, a spring 7, a pressure sensor 8, a square clamp 9, a sheet metal part to be tested 10, a bolt 11, a telescopic clamp 12, a limiting groove 13, a base 14 and a fixing gasket 15.
Detailed Description
The structure and operation of the present invention will be further described with reference to the accompanying drawings and specific embodiments:
example 1: as shown in fig. 1 to 3, the fatigue testing device for the sheet metal part formed by the rubber is characterized by comprising a square clamp 9, a telescopic clamp 12, a loading bolt 6 and a box body 2, wherein a transmission shaft 3 penetrating through the box body 2 is arranged on the box body 2, and an eccentric wheel 4 capable of axially sliding along the transmission shaft 3 is sleeved on the transmission shaft 3; a limiting groove 13 is formed in the inner surface of the box body 2; the limiting groove 13 is provided with a square clamp 9, and the square clamp 9 is connected with the limiting groove 13 in a sliding manner; the square clamp 9 is provided with a through cavity, the upper surface of the square clamp 9 is provided with a through hole in the vertical direction, and the through hole is in threaded connection with the loading bolt 6; a nut is arranged on the upper surface of the cavity and connected with the loading bolt 6; the upper surface of the loading bolt 6 is tightly attached to the eccentric wheel 4, a spring 7 is sleeved on the loading bolt 6, a pressure sensor 8 is arranged between the spring 7 and the loading bolt 6, the upper end of the spring 7 is tightly attached to the pressure sensor 8, and the lower end of the spring 7 is tightly attached to the upper surface of the square clamp 9; the retractable clamp 12 is arranged at the bottom of the box body 2.
The lower surface of the square clamp 9 is provided with a plurality of threaded holes in the vertical direction, and the telescopic clamp 12 is provided with a plurality of threaded holes in the transverse direction.
The side of scalable anchor clamps 12 and the sheet metal component 10 laminating that awaits measuring is straight face or concave surface.
One end of the transmission shaft 3 is connected with the motor 1, and the other end of the transmission shaft 3 is connected with a turn number counter 5.
In this embodiment, the sheet metal component crimp that awaits measuring is straight crimp, a side of scalable anchor clamps is the straight face, square anchor clamps are located in the spacing inslot, can only be at the direction seesaw of spacing groove, the motor passes through the transmission shaft and drives the eccentric wheel rotatory, with force transmission to square anchor clamps on, simultaneously with the effort on the sheet metal component that awaits measuring, reciprocating motion through the eccentric wheel, with cycle alternating stress action on the sheet metal component that awaits measuring, after the work piece fracture, the number of turns that the number of turns counter shows, the fatigue life who awaits measuring the sheet metal component promptly.
Example 2: example 2 has a similar basic structure and implementation to example 1, as shown in fig. 4 and 5, except that: the sheet metal component 10 crimp that awaits measuring is protruding crimp, and in order to make the sheet metal component 10 that awaits measuring can be stable, the side of scalable anchor clamps 12 and the sheet metal component 10 laminating that awaits measuring is the concave surface, and the fixed gasket 15 that need be laid up at bolt 11 and the sheet metal component 10 junction that awaits measuring to the protruding crimp of sheet metal component 10.
The measurement method of the present invention is further described with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1 to 5, in a testing method of a rubber-formed sheet metal part fatigue testing device, one side of a sheet metal part 10 to be tested is connected with a square clamp 9 through a bolt 11, the other side of the sheet metal part 10 to be tested is connected with a telescopic clamp 12 through a bolt 11, and a fixing gasket 15 is arranged at the joint of the bolt 11 and the sheet metal part 10 to be tested. The eccentric wheel 4 is rotated for one circle, the reading of the pressure sensor 8 is read, and the magnitude of the loading force is adjusted by adjusting the stiffness coefficient of the spring 7 to meet the requirement of the fatigue testing force or the magnitude of the loading force is adjusted by adjusting and changing the magnitude of the eccentric wheel 4. Starting the motor 1 to drive the eccentric wheel 4 to rotate, enabling the eccentric wheel 4 to reciprocate, enabling periodic alternating stress to act on the square clamp 9, enabling the square clamp 9 to apply the periodic alternating stress to the sheet metal part 10 to be tested, closing the motor 1 after the sheet metal part 10 to be tested is subjected to fatigue fracture, and reading out the number of turns displayed by the turn counter 5, namely the fatigue life of the sheet metal part 10 to be tested.
In this embodiment, square anchor clamps are located the spacing inslot, can only be at the direction seesaw of spacing groove, and the motor passes through the transmission shaft and drives the eccentric wheel rotatory, with power transmission to square anchor clamps on, simultaneously with the effort on the sheet metal component that awaits measuring, through the reciprocating motion of eccentric wheel, with periodic alternating stress action on the sheet metal component that awaits measuring, the size of accessible adjustment eccentric wheel or the coefficient of stiffness of adjusting the spring to the adjustment loading force. Meanwhile, the telescopic clamp and the square clamp can be adjusted in position according to the size of the sheet metal part to be measured.
Claims (8)
1. A rubber forming sheet metal part fatigue test device is characterized by comprising a square clamp, a telescopic clamp, a loading bolt and a box body, wherein a transmission shaft penetrating through the box body is arranged on the box body, and an eccentric wheel capable of axially sliding along the transmission shaft is sleeved on the transmission shaft;
a limiting groove is formed in the inner surface of the box body;
the limiting groove is provided with a square clamp, and the square clamp is connected with the limiting groove in a sliding manner;
the square clamp is provided with a through cavity, the upper surface of the square clamp is provided with a through hole in the vertical direction, and the through hole is in threaded connection with the loading bolt; a nut is arranged on the upper surface of the cavity and connected with the loading bolt;
the upper surface of the loading bolt is tightly attached to the eccentric wheel, a spring is sleeved on the loading bolt, a pressure sensor is arranged between the spring and the loading bolt, the upper end of the spring is tightly attached to the pressure sensor, and the lower end of the spring is tightly attached to the upper surface of the square clamp;
the telescopic clamp is arranged at the bottom of the box body and is positioned below the square clamp.
2. The fatigue testing device for sheet metal parts formed by rubber as claimed in claim 1, wherein said square jig has a plurality of threaded holes on a lower surface thereof in a vertical direction, and said retractable jig has a plurality of threaded holes in a lateral direction.
3. The fatigue testing device for the sheet metal parts formed by the rubber according to claim 1 or 2, wherein the side surfaces of the telescopic clamp, which are jointed with the sheet metal parts to be tested, are straight surfaces or concave surfaces.
4. The fatigue testing device for the sheet metal parts formed by rubber as claimed in claim 1, wherein one end of the transmission shaft is connected with the motor, and the other end of the transmission shaft is connected with a circle counter.
5. A test method of the rubber-formed sheet metal part fatigue test device according to any one of claims 1 to 4, characterized in that one side of the sheet metal part to be tested is connected with the square clamp through a bolt, the other side of the sheet metal part to be tested is connected with the telescopic clamp through a bolt, and a fixed gasket is arranged at the joint of the bolt and the sheet metal part to be tested.
6. The test method of the fatigue test device for the sheet metal parts formed by the rubber as claimed in claim 5, wherein the eccentric wheel is rotated for one circle, the reading of the pressure sensor is read, and the magnitude of the loading force is adjusted to meet the requirement of the fatigue test force by adjusting the stiffness coefficient of the spring.
7. The test method of the fatigue test device for the sheet metal parts formed by the rubber as claimed in claim 5, wherein the magnitude of the loading force is adjusted by adjusting and changing the magnitude of the eccentric wheel.
8. The test method of the rubber-formed sheet metal part fatigue test device according to claim 6 or 7, characterized in that the motor is started to drive the eccentric wheel to rotate, the eccentric wheel reciprocates, periodic alternating stress is applied to the square clamp, the square clamp applies the periodic alternating stress to the sheet metal part to be tested, when the sheet metal part to be tested is subjected to fatigue fracture, the motor is turned off, and the number of turns displayed by the number-of-turns counter is read, namely the fatigue life of the sheet metal part to be tested.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810366710.4A CN108956344B (en) | 2018-04-23 | 2018-04-23 | Rubber forming sheet metal part fatigue test device and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810366710.4A CN108956344B (en) | 2018-04-23 | 2018-04-23 | Rubber forming sheet metal part fatigue test device and test method |
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| CN108956344A CN108956344A (en) | 2018-12-07 |
| CN108956344B true CN108956344B (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810366710.4A Active CN108956344B (en) | 2018-04-23 | 2018-04-23 | Rubber forming sheet metal part fatigue test device and test method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU752155A2 (en) * | 1978-12-25 | 1980-07-30 | Томский инженерно-строительный институт | Impact-fatigue testing machine |
| CN102251096A (en) * | 2011-06-14 | 2011-11-23 | 西安飞机工业（集团）有限责任公司 | Sheet metal part vibratory stress relief method and device |
| CN202710426U (en) * | 2012-06-12 | 2013-01-30 | 三一重工股份有限公司 | Flexural fatigue testing machine |
| CN203184438U (en) * | 2013-04-10 | 2013-09-11 | 杭州电子科技大学 | Rubber molding convex flange multistep forming die |
| CN204575433U (en) * | 2015-02-03 | 2015-08-19 | 安徽机电职业技术学院 | A kind of test stationary fixture of plates of automobile class formation part |
| CN105115839A (en) * | 2015-09-18 | 2015-12-02 | 河海大学 | Fatigue machine equipped with transmission rotating arm |
| CN105699224A (en) * | 2016-04-08 | 2016-06-22 | 浙江大学城市学院 | Lumbar fatigue testing machine |
| CN206489012U (en) * | 2017-03-02 | 2017-09-12 | 上海市城市建设设计研究总院（集团）有限公司 | Simulate the electric device of vertical cyclic load |
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2018
- 2018-04-23 CN CN201810366710.4A patent/CN108956344B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU752155A2 (en) * | 1978-12-25 | 1980-07-30 | Томский инженерно-строительный институт | Impact-fatigue testing machine |
| CN102251096A (en) * | 2011-06-14 | 2011-11-23 | 西安飞机工业（集团）有限责任公司 | Sheet metal part vibratory stress relief method and device |
| CN202710426U (en) * | 2012-06-12 | 2013-01-30 | 三一重工股份有限公司 | Flexural fatigue testing machine |
| CN203184438U (en) * | 2013-04-10 | 2013-09-11 | 杭州电子科技大学 | Rubber molding convex flange multistep forming die |
| CN204575433U (en) * | 2015-02-03 | 2015-08-19 | 安徽机电职业技术学院 | A kind of test stationary fixture of plates of automobile class formation part |
| CN105115839A (en) * | 2015-09-18 | 2015-12-02 | 河海大学 | Fatigue machine equipped with transmission rotating arm |
| CN105699224A (en) * | 2016-04-08 | 2016-06-22 | 浙江大学城市学院 | Lumbar fatigue testing machine |
| CN206489012U (en) * | 2017-03-02 | 2017-09-12 | 上海市城市建设设计研究总院（集团）有限公司 | Simulate the electric device of vertical cyclic load |
Non-Patent Citations (1)
| Title |
|---|
| 口腔修复体疲劳寿命测试机的研制与标定（一）——仪器的研制;李明勇等;《医疗卫生装备》;20041231(第6期);第90-91页 * |
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| CN108956344A (en) | 2018-12-07 |
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