A model to predict minimum required clamp pre-loads in light of fixture–workpiece compliance
✍ Scribed by Edward C. De Meter; Wei Xie; Shabbir Choudhuri; Subramanian Vallapuzha; Martin W. Trethewey
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 588 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0890-6955
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✦ Synopsis
The determination of minimum required clamp pre-loads is an important process in the design of machining fixtures. This paper presents a linear, clamp pre-load (LCPL) model that can be applied to fixtureworkpiece systems whose compliance is load invariant. The model considers the static deformation of the fixture-workpiece system in response to the clamping process and the machining process. Sources of compliance throughout a fixture-workpiece system are considered. The model computes the minimum required pre-loads necessary to prevent workpiece slip at the fixture-workpiece joints throughout the machining process.
This paper also describes an experimental study that was used to characterize the accuracy of the LCPL model with regard to the application of a ramping external load to a fixture-workpiece system. Over the contact conditions tested, the LCPL model was observed to overestimate the minimum required clamp preloads by an average of 7%. This experimental study also revealed the sensitivity of the computed preloads to the relative compliance of the fixture elements as well as the coefficient of friction.