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動靜萬能疲勞試驗機 疲勞試驗機如何操作

時間：2020-08-27    來源：儀多多儀器網(wǎng)    作者：儀多多商城     
　　用于測試各類金屬材料、復(fù)合材料、結(jié)構(gòu)件、部件的動態(tài)性能、疲勞壽命等力學(xué)性能試驗。滿足ASTM、ISO、DIN、FUL、JIS等國際疲勞測試標準。廣泛應(yīng)用于航空航天、高校研究所、質(zhì)檢單位等。

　　馥勒提供專業(yè)的拉伸疲勞試驗夾具、壓縮試驗夾具、彎曲試驗夾具、剪切試驗夾具、斷裂韌性試驗夾具等可供客戶選擇

　　馥勒疲勞試驗軟件：在Windows 多種環(huán)境下運行，界面友好，操作簡單，能完成試驗條件、試樣參數(shù)等設(shè)置、試驗數(shù)據(jù)處理，試驗數(shù)據(jù)能以多種文件格式保存，試驗結(jié)束后可再現(xiàn)試驗歷程、回放試驗數(shù)據(jù)，試驗數(shù)據(jù)可導(dǎo)入在Word、Excel、Access等多種軟件下，進行統(tǒng)計、編輯、分類、擬合試驗曲線等操作，試驗完成后，可打印出試驗報告.

　　備注：馥勒FULETEST公司保留疲勞機機型升級的權(quán)利，更新后恕不另行通知，如有問題請在線咨詢或致電詳細情況。未經(jīng)授權(quán)，請勿復(fù)制。

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    說到彈簧疲勞試驗機，眾多人也許對其工作原理有所了解，但在維護保養(yǎng)工作上無法做好。本文就和大家一起了解一下疲勞試驗機維護保養(yǎng)相關(guān)知識。
    1、彈簧試驗機在正常工作狀態(tài)下，誤差需要校驗一次，其有效周期為一年。誤差校驗是非常重要的工作，只有經(jīng)過精準的校驗，才能保證測量的數(shù)據(jù)精準無誤。反之，校驗工作不正規(guī)的話，會影響試驗機測量，無法滿足人們測量需求。
    2、彈簧試驗機在操作的過程中，一定要注重卸荷問題。卸荷的時候不能猛地松手，這樣會使設(shè)備產(chǎn)生強烈的震動，影響試驗機的精度。
    3、試驗機升降齒條及油杯中應(yīng)該要經(jīng)常加入潤滑油，保證試驗機不會經(jīng)常出現(xiàn)死機的狀態(tài)。潤滑油的作用主要是將保證設(shè)備更好的運行，同時能提升設(shè)備的運行效率。
    4、試驗機如果使用完畢之后，應(yīng)該要對其進行保護，罩上機衣，防止灰塵落入設(shè)備之中，影響設(shè)備的正常使用，降低設(shè)備的使用壽命。
    5、使用試驗機的壞死后應(yīng)該要妥善保護，安全接地，才能保證其使用標準，測量精準的數(shù)據(jù)信息。
    6、試驗機要定期清洗，由于設(shè)備長期工作，設(shè)備中會含有大量的灰塵屑，影響設(shè)備正常測量。如果長期不清洗灰塵，一定會給設(shè)備帶來測量負擔(dān)，影響設(shè)備測量的精準度。





Hydraulic cylinder vibrates to a 400 Hz sine.

(DYNA-MESS Gmbh) and Hänchen reach new heights of performance

Modern quality standards mean that components are now facing more varied and useful tests than at any time before. DYNA-MESS Testing Systems specialises in testing machines for dynamic component and material testing. With its broad and varied range of standard and special test machines, the Aachen-based company exploits the possibilities of modern fluid technology to the best advantage. Its pièce de resistance is a special testing machine for elastomers which, with the help of standard hydraulic cylinders from Hänchen, realises controlled vibrations of 400 Hz in order, for instance, to test the damping of bearing elements made of rubber-metal composites for the automotive industry.

Hydraulics is cutting-edge technology

According to Dr. Marcus Jarchow, Managing Director of DYNA-MESS, "these test units are exposed to extreme stresses with a nominal force of 10 kN and a frequency of anything from 0 to 400 Hz. It has been extremely difficult to find a suitably high-performance hydraulic cylinder on the hydraulics market", because the test device depends on the perfect stick-slip behaviour of the hydraulic system. Cylinders with hydrostatically supported piston rod guides are normally used for this type of application, but the technical expenditure for this solution is enormous. "We have nevertheless kept our ears to the ground to try and find out who can offer some help with finding a solution" stated the Managing Director of DYNA-MESS. "Everybody hesitated when we mentioned the technical requirements, with the exception of Hänchen Hydraulik. A further argument in their favour was that they had their own test equipment and would be able to base their results on extensive experience. Ultimately, the hydraulic specialists from Ostfildern, near Stuttgart, offered a standard cylinder with patented, floating annular gap seal which is considerably more cost-effective than drives with hydrostatically supported piston rod guides". The PZL assembly series from Hänchen, however, also provides these high-end cylinders.

The PZR floating annular gap seal

The patented, floating annular gap seal from Hänchen permits the use of cost-effective PZR high-end test cylinders, in which a steel sleeve is positioned through a choke gap and thereby creates a contact-free sealing gap of just a few 1/100 mm. This process can, however, only function correctly with a production accuracy of only a few µm, as leaks would otherwise lead to an unacceptable loss of hydraulic fluid. This PZR assembly differs only by the slightly lesser absorption of the lateral forces from a cylinder with hydrostatically supported piston rod guide, but yields a considerable cost advantage. Thanks to their negligible friction, however, PZR cylinders offer maximum positioning and repeat accuracy and are stick-slip free, making them ideally suitable for extremely slow as well as fast movements and minimum travel over ranges of a very few µm. As lateral forces are not experienced in this 400 Hz DYNA-MESS test equipment, the decision was made in favour of these cylinders.

High-quality peripherals

The cylinder is equipped with a special inductive position measuring system and a force transducer with an extremely low natural frequency and yield measuring strips. Both sensors supply analog output signals which are digitalised with a resolution of 16 Bit and tested with more than 20 kHz. They supply the control with the necessary data, which must be converted practically in real time by a control card with its own high-performance processor. Tried-and-tested DYNA-MESS software modules were adapted to the special conditions to facilitate programming. A PC forms the basis for the Windows user interface. The valves represented yet another technical challenge, as they have to work with a control frequency of 16 kHz. The fluid circuit has been designed for 300 bar and operates at 40 l/min. This high power density enabled a low design size, because a high frequency with a wide frequency spectrum places extremely high demands on the mechanical construction: the frame must not have any natural resonance over the whole of the frequency range.

Commissioning

Commissioning proved to be a time-consuming exercise, particularly due to the need to tune in to the various frequency ranges. The frequency was increased in steps of 10, 20, 30 … up to 400 Hz, with the resonance having to be minimised at every stage. The complete control was also tuned during this time, in that the runtime delays between the reaction of the processor and its execution by the hydraulic system are captured and included in the control. Finally the control quality and curve form were optimised, this operation being followed by fine tuning with the help of a friction-free and loss-free spring, which measures the dynamic without phase displacement and so enables material tests to be carried out under clearly defined conditions. After up to 400 Hz had been reached, Dr. Jarchow’s team carried out further tests up to a frequency of 1,000 Hz. "We were surprised at what outputs were possible, up to double the nominal output at 800 Hz", said the hydraulic specialist. "It was only above this frequency that the limits of what is technically feasible at the moment were clearly reached. The hydraulic cylinder has more than matched the requirements placed on it, and that was with the use of a catalogue cylinder and at a very attractive price”. The finished system was then commissioned during the first quarter of 2002.

Practical application

Hänchen’s PZR hydraulic cylinders are now being used by a Daimler-Chrysler supplier to test vibration dampers for engine and gearbox suspensions for load carrying ability, damping behaviour and service life. These components are made from rubber-metal composite material with embedded passive hydraulic damping. The sealed glycol circuit in this component is used to dampen the vibrations. A new test bench enables the developers to optimise the damping characteristics. Sweep tests with a pre-selected load which corresponds to the engine or gearbox weight are used to determine at which frequency damping is most effective. For this test the frequency is superimposed over the static load with the aim of achieving an optimised damping over the whole frequency range of up to 400 Hz."

Our engineering competence, the experience and evaluation of our suppliers as well as the ability to develop test solutions together with our customers were the deciding factors", explained Dr. Jarchow, whose team performs all calculations, is responsible for design, software, electronic development, control, configuration as well as installation and realises the complete system in co-operation with the suppliers. "Suppliers whose products conform to our own high standards play a critical role. That is why we are working together with Hänchen Hydraulik".

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