Testing of Springs

Among the most important classical design elements are springs, in which the elastic properties of materials are exploited for energy storage and conversion. Without springs—regardless of their design—no mechanical or electro-mechanical system would operate. The main functions of engineering springs are

  • Absorbing impacts and vibrations
  • Distributing and counterbalancing forces
  • Maintaining pretensioning
  • Maintaining a defined position or state
  • Measuring and regulating forces and moments

ZwickRoell offers special solutions for the most varied spring systems.

Uniaxial Testing of Helical Compression Springs

Rapid technical advance has led to a significant increase in the demands placed on the accuracy and durability of springs. The corollary of this is greater demands on manufacturing accuracy due to ever-smaller dimensional, form, and positional tolerances, with similarly enhanced requirements for testing technology.

The PrecisionLine series easily meets the increasing demands placed on state-of-the-art precision spring testing machines, where the highest level of accuracy and repeatability is called for. It was developed for the testing of springs with very low tolerances, such as those used in many mechatronic assemblies and function units in the automotive industry. The series design takes all error influences into account.

Key features

  • Force is applied to the center axis of the test area; there are no guides in the flow of force 
  • The material measure (non-contact incremental measuring system) is aligned with the measurement path
  • Load cell deformation is compensated mechanically

The zwickiLine (single-column testing machine) with testControl electronics, together with the precision spring compression test kit, is ideally suited for use as a precision spring testing machine. The kit is extremely transverse force-resistant and protects against overload. The ground, demagnetized compression platens have a parallel alignment of 1 µm/10 mm and precision guides permit only precise vertical movement of the compression platens. Measuring errors caused by deformation or lateral forces of the springs are reduced to a minimum thanks to the extremely stiff load cell, which is resistant to transverse forces.

多分量弹簧试验

多分量测量平台可以被用于测量压缩螺旋弹簧(如气门弹簧或麦弗逊悬挂所用的弹簧)的力矢量,标准的试验机系统加装了该6通道或9通道的测量平台后就可以进行弹簧试验。该测量平台就可以测定弹簧在压缩载荷下各个方向的应力分力,测量结果是评估部件摩擦、磨损以及寿命的重要依据。

空气弹簧试验

各温度下的空气弹簧试验 

ZwickRoell的空气弹簧试验系统可以测定各种温度条件下,空气弹簧的粘弹性以及疲劳性能。试验系统由一台电液伺服疲劳试验机为基础,配备液体静压轴承以及一套特制的压缩试验装置(挂载于T型槽平台),可以用于测量各种形状和尺寸的空气弹簧。试验系统还配备了两个测量空气弹簧直径的测量传感器,整套系统也可以放入恒温箱,在-80 到 +250 °C下进行试验。
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多轴弹簧试验

符合EN 13597标准的空气弹簧多轴试验装置 

该试验装置可以用于空气弹簧的质量控制以及研发。装置包括一台最大试验力Fmax 250 kN的立式电子万能材料试验机、最大50 kN的水平电机以及5通道测量平台(3个垂直力传感器以及2个水平力传感器)。为了测定空气弹簧的水平和轴向刚度,试验系统会对试样加载垂直、水平以及复合载荷。试验系统可以分别单独控制以下通道:

  • 垂直方向力和行程
  • 水平方向力和行程
  • 气体或液体内压

试验机的载物台可以用于将试样推入试验机,方便试样装载过程。

汽车悬挂的多轴试验

试验系统配备了3个试验轴用于测定液压减震器的阻尼性能:垂直方向载荷(车轮载荷)由试验机横梁施加;水平以及扭转载荷(车辆转弯、加速、减速等)由固定在试验机上的水平作动缸以及扭转马达施加。试验系统可以对每个试验轴分别进行独立控制,这就可以测定不同轴向速度下,不受横向力以及扭转力影响的减震器性能(如摩擦阻尼、粘滞性)。
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