Device and method for accurate calculation of hemming loss

Abstract

The invention discloses a precise measurement device for folding loss. The precise measurement device comprises an upper mould rack, a lower mould rack and a trimming and punching component, a pre-flanging component, a secondary flanging component, an undercutting component, a laser scanning rangefinder and a computer arranged between the upper mould rack and the lower mould rack; guiding posts are arranged on the upper side of the lower mould rack; guiding holes matched with the guiding posts are formed in the upper mould rack; the trimming and punching component is used for feeding and punching of an outer plate and an inner plate; the pre-flanging component is sued for bending the outer plate into a right angle; the secondary flanging component is used for further bending the right angle outer plate into a closed angle; the undercutting component is used for flanging the outer plate and clamping the outer plate out of the inner plate; the laser scanning range finder is sued for measuring the smallest horizontal distance between the laser scanning range finder and an outer contour; and the computer acquires the smallest horizontal distance between the laser scanning rangefinder and the outer contour of the bending part of the outer plate and calculates the folding loss. By adopting the precise measurement device, difficulty of measurement of the folding loss is lowered; and precision and speed of measurement are improved.

Description

technical field [0001] The invention relates to the technical field of hemming loss measurement, in particular to a device and method for accurately measuring and calculating hemming loss. Background technique [0002] For car body panels such as front covers and door panels, the inner and outer panels are linked by hemming, which generally requires multi-stage hemming to complete. Due to the thickness of the panels, the outline of the outer panel will change during the hemming process. The value of the change is Flange loss (FV), that is, it reflects the change in length of the outer plate parts before and after the flange. [0003] From the perspective of the car body, the hemming loss reflects the difference between the single-piece outline and the assembly outline, and it is a bridge between the two. Accurate hemming loss can ensure that when a single piece is qualified, the outline of the assembly is also qualified; on the contrary, if there is an error in the hemming ...

AI Technical Summary

Problems solved by technology

[0005] The punching method is an intuitive and fast measurement method, but it requires high measurement technology. Experienced hemming loss measurement personnel are very scarce, and the labor cost is very high. Moreover, there are deviations in the values ​​measured by different people, and the same person twice There are also deviations between measurements, and the error of manual measurement is relatively large. In addition, when workers use the punching method to measure, they need to manually complete multiple steps such as cutting, punching, folding and measuring, which is time-consuming and laborious.

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