willpolt.blogg.se - Spring compression tester

Spring compression tester full#
Spring compression tester series#
Spring compression tester free#

Spring testing is typically performed using a monotonic test with an end-of-test criteria.

Spring compression tester free#

A virtual measurement subtracts this variable from the displacement to create a “Corrected Spring Deflection,” which will artificially zero the deflection after reaching the free height. At the conclusion of this step, a variable is set equivalent to the displacement at that moment. Within the Test Profiler workflow in Bluehill Universal, an initial “Ramp to Free Height” step is utilized in order to reach the preload value. The deflection realistically should not begin until the free height is reached, as this will provide the most accurate force deflection profile possible. Most manufacturers will use a set preload before determining the free height of the spring. This distance can be made greater if the operator needs to access a locating rod or feature to set the spring in place. Using Auto Positioning, the system can be set up to require the platen to always move to a set distance above the measured spring height, allowing the operator to easily place the spring between the platens. The operator inputs are configured to require the measured spring height, which is used to determine where the upper platen should be positioned before the test. Using the rich feature set of Bluehill Universal, a method can be created to accommodate helical compression springs regardless of size or stiffness. This ensures that an operator can be confident that the fixtures will always move to the correct starting position, depending on the measured spring height.

Spring compression tester series#

The 6800 Series utilizes a feature called Auto Positioning, which leverages an absolute encoder to create and save global system configurations. The system capacities range from 500 N to 300 kN and are capable of testing springs of most common sizes. Instron’s new 6800 Series systems are ideal for simple tensile and compression testing requiring only unidirectional force analysis. It is important to remember this height is often never attained in actual use of the spring, but is important for understanding the force and displacement limits for the end product. The solid height is measured as the height at which the coil gap reaches zero.This preload value can vary depending on the stiffness of the spring.

Spring compression tester full#

The free height of a spring is often calculated as the measured spring height after applying a small preload to ensure that the ends have come into full contact with the loading surface.In practice, this can be calculated by finding the slope of the force-displacement curve. The spring constant, often denoted as k, is the proportional factor between the force and displacement.

The spring constant is determined following Hooke’s law, a theory that asserts the deformation of an elastic object is proportional to the stress applied to the object.

Universal testing systems can help characterize these properties, including the spring constant, free height, and solid height. In order to reach the optimal set of working parameters, manufacturers will evaluate the springs with a universal testing machine to see if any of these factors have altered the final product. There are many factors that can affect a spring’s properties, including material type, wire diameter, pitch, number of coils, and inner/outer diameters. This guide will specifically look at helical compression springs, because they make up the majority of testing inquiries. There are three primary types of springs designed for different types of applied force: compression, tension, and torsion. Regardless of a spring's end use application, extensive testing is required to ensure that they exhibit the desired mechanical qualities - namely stiffness and strength - that allow them to perform successfully. Springs are common items used in thousands of applications, from the production of simple consumer goods to the automotive, aerospace, and biomedical industries.