In the era of cloud computing and Industry 4.0, significant research efforts on cloud manufacturing have been witnessed in recent years. Nevertheless, challenges, such as issues of trust, safety, payment, remain in this emerging area, which cause less confidence for industry to adopt cloud manufacturing. In this regard, the recent development of blockchain technology provides a potential viable solution thanks to its unique advantages in decentralization and security. As such, we propose a new framework of cloud manufacturing by integrating the blockchain technology. In essence, consensus-oriented mechanisms are employed to generate the operating standards for the blockchain cloud manufacturing model. Moreover, based on the open source Ethereum code, we construct a simulation case study for 3D printing services using the proposed framework. A consortium or federated blockchain is simulated which uses Proof-of-Authority (PoA) as the consensus algorithm of block generation. The simulation involves 939 job requests from 100 users, as well as 10 service providers. The k-nearest neighbors (KNN) algorithm is employed to recommend the service provider for each request. The results show that the provider’s score of service evaluation tends to be stabilize, and 934 requests for service are successfully fulfilled by the appropriate providers while the remaining 5 requests fail to be serviced.

在云计算和工业4.0时代，近年来见证了有关云制造的大量研究工作。尽管如此，诸如信任，安全，支付等问题仍然存在于这一新兴领域，这给行业采用云制造带来了信心不足。在这方面，由于其在去中心化和安全性方面的独特优势，区块链技术的最新发展提供了潜在的可行解决方案。因此，我们通过整合区块链技术提出了一种新的云制造框架。本质上，采用面向共识的机制来生成区块链云制造模型的操作标准。此外，基于开源的以太坊代码，我们使用提出的框架构建了一个3D打印服务的仿真案例研究。模拟了使用授权证明（PoA）作为区块生成的共识算法的联盟或联合区块链。模拟涉及来自100个用户以及10个服务提供商的939个职位请求。的采用k近邻（KNN）算法为每个请求推荐服务提供商。结果表明，提供者的服务评估得分趋于稳定，适当的提供者成功满足了934个服务请求，而其余5个请求则无法满足。