B1B2与3C1B共线工艺在商用车涂装中的应用

Coproduction of B1B2 and 3C1B processes for commercial vehicle painting on the same line

摘要

[目的]旨在解决驾驶室涂装过程中颜色种类多、VOCs(挥发性有机化合物)排放超标及涂料属性不一致而无法使用同种涂布设备完成施工的问题。[方法]以某公司建造的行业领先水平的B1B2(免中涂)与3C1B(三涂一烘)共线工艺可实现多种颜色水性与溶剂型涂料共线涂装的优势，针对B1B2−3C1B共线工艺与3C2B(三涂二烘)工艺的差异及其可解决涂装颜色种类多、施工工艺复杂等问题，将B1B2与3C1B共线涂装工艺布局与传统的3C2B进行对比，介绍了B1B2与3C1B共线涂装的工艺管控要点(如电泳漆粗糙度、漆膜厚度、环境温湿度、烘烤工艺参数)及相关验证试验。[结果]与传统的3C2B工艺相比，B1B2与3C1B共线工艺的VOCs排放低、工艺流程简单，且可使用不同颜色的溶剂型及水性漆共线喷涂驾驶室。[结论]B1B2和3C1B工艺对生产场所的环境要求基本相同，只是B1B2对闪干炉要求更高，两者可实现共线涂装。本文为行业内其他主机厂引入此共线生产工艺提供了参考。

Abstract

[Objective] To address the challenges in cabin painting processes such as the multiplicity of color variants, excessive volatile organic compounds (VOCs) emissions, and incompatibility of paint properties that prevent the use of the same application equipment. [Method] Utilizing the industry-leading process for coproduction of B1B2 compact (midcoat-free) process and 3C1B (three-coat-one-bake) process on the same line developed by a manufacturer, which enables simultaneous application of water-based and solvent-based paints in various colors, the layout differences between the B1B2−3C1B coproduction and the conventional 3C2B (three-coat-two-bake) process were compared. Key process control parameters including e-coat roughness, film thickness, ambient temperature and humidity, and baking schemes along with relevant validation tests were discussed. [Result] As compared with the conventional 3C2B process, the coproduction of B1B2 and 3C1B on the same line offered lower VOCs emissions, simplified process flow, and greater flexibility in handling both solvent-based and water-based paints of diverse colors for cabin spraying. [Conclusion] The environmental requirements for the B1B2 and 3C1B processes are essentially identical, except that B1B2 imposes stricter demands on the flash-off oven, making coproduction on the same line feasible. This study provides a reference for other automotive original equipment manufacturers (OEMs) considering the adoption of similar painting technologies.

关键词

汽车涂装 / 免中涂工艺 / 三涂一烘工艺 / 共线生产 / 电泳 / 烘烤 / 工艺布局

Key words

automotive painting / compact process / three-coat-one-bake process / coproduction on the same line / electrodeposition / baking / process layout

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