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金屬材料旋轉(zhuǎn)彎曲疲勞試驗(yàn)機(jī) 疲勞試驗(yàn)機(jī)如何做好保養(yǎng)

時(shí)間：2020-08-28    來(lái)源：儀多多儀器網(wǎng)    作者：儀多多商城     
　　該機(jī)根據(jù)《GB/T 4337-2008 金屬材料 疲勞試驗(yàn) 旋轉(zhuǎn)彎曲方法》設(shè)計(jì)制造，主要用于金屬材料旋轉(zhuǎn)彎曲疲勞的檢測(cè)。被測(cè)試樣安裝在可調(diào)整空間的兩夾頭之間，試樣彎曲規(guī)定角度后，左側(cè)夾頭夾緊試樣左端并帶動(dòng)試樣沿軸線(xiàn)旋轉(zhuǎn)，右側(cè)夾頭約束長(zhǎng)度位置和彎曲角度，試樣右端夾頭可在夾頭座的套筒內(nèi)自由旋轉(zhuǎn)。通過(guò)調(diào)整或更換夾具，適應(yīng)不同的被測(cè)試樣的試驗(yàn)。試驗(yàn)機(jī)采用計(jì)算機(jī)控制操作，可設(shè)置彎曲角度、扭轉(zhuǎn)速度。實(shí)時(shí)顯示試驗(yàn)圈數(shù)、試驗(yàn)曲線(xiàn)、記錄試驗(yàn)過(guò)程最大彎矩峰值，記錄疲勞斷裂的旋轉(zhuǎn)次數(shù)，試樣斷裂自動(dòng)停機(jī)，試驗(yàn)數(shù)據(jù)存儲(chǔ)，打印試驗(yàn)結(jié)果。

　　10. 兩夾頭間直線(xiàn). 兩夾頭間直線(xiàn). 夾持試樣直徑范圍：φ3～φ8（根據(jù)客戶(hù)要求）

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". 疲勞試驗(yàn)機(jī)的特點(diǎn)都有哪些呢？

    疲勞試驗(yàn)機(jī)是一種主要用于測(cè)定金屬及其合金材料在室溫狀態(tài)下的拉伸、壓縮或拉、壓交變負(fù)荷的疲勞性能試驗(yàn)的機(jī)器。

    關(guān)于疲勞試驗(yàn)機(jī)你們的了解有多少呢?

    下面來(lái)為大家詳細(xì)介紹一下疲勞試驗(yàn)機(jī)的特點(diǎn)與使用時(shí)會(huì)出現(xiàn)的誤差，一起來(lái)看看吧。

    疲勞試驗(yàn)機(jī)的特點(diǎn)與使用時(shí)會(huì)出現(xiàn)的誤差

    疲勞試驗(yàn)機(jī)的特點(diǎn)

    首先，它是一種穩(wěn)定性很不錯(cuò)的設(shè)備。

    類(lèi)似于這種大型工業(yè)設(shè)備，用戶(hù)對(duì)它的要求就是穩(wěn)定性可靠，這不僅關(guān)系到正常的工作效率，同時(shí)也關(guān)系到每個(gè)工作人員的安全問(wèn)題。

    可靠的穩(wěn)定性主要體現(xiàn)在，設(shè)備不會(huì)因?yàn)樽枇τ兴兓陀绊懙竭\(yùn)行，阻力有變化，設(shè)備也可以在范圍之內(nèi)正常工作。

    其次，低噪音。

    大型設(shè)備工作過(guò)程中難免會(huì)有很大的噪音，所以生產(chǎn)車(chē)間的環(huán)境往往會(huì)有大噪音，工作人員在這樣的環(huán)境中工作對(duì)身體也沒(méi)有好處。

    而該設(shè)備的噪音很低，贏得用戶(hù)的認(rèn)可。

    再其次，安裝簡(jiǎn)單，維護(hù)方便。

    我們都知道大型設(shè)備安裝的時(shí)候會(huì)比較麻煩，后期維護(hù)也會(huì)造成大的成本。

    但是疲勞試驗(yàn)機(jī)正好相反，簡(jiǎn)單的結(jié)構(gòu)和精湛的工藝技術(shù)，減少了安裝的繁瑣，后期維護(hù)也簡(jiǎn)單方便；

    據(jù)了解，設(shè)備運(yùn)行過(guò)程中不需要使用水源，電也用的好，所以這也大大減少成本支出。

    另外，使用壽命長(zhǎng)久。

    疲勞試驗(yàn)機(jī)的價(jià)格昂貴，能夠購(gòu)買(mǎi)一臺(tái)這樣的設(shè)備，對(duì)于任何一個(gè)廠子都是一筆不小的開(kāi)支。

    幸好設(shè)備使用壽命長(zhǎng)久，能夠?yàn)閺S子帶來(lái)更大的經(jīng)濟(jì)效益。

    還有，疲勞試驗(yàn)機(jī)是一種高科技設(shè)備，品質(zhì)優(yōu)越，效率高，成本低，這樣的設(shè)備不斷在哪里都是用戶(hù)青睞的。

標(biāo)簽: 疲勞試驗(yàn)機(jī) 疲勞試驗(yàn)機(jī)標(biāo)簽： 疲勞試驗(yàn)機(jī)的特點(diǎn)都有哪些呢？_疲勞試驗(yàn)機(jī)組合標(biāo)題：

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