精铸模具与机加工模具比较，生产周期短，制造成本低，故有很好的发展前景。
These dies are shorter in productive cycle and lower in cost than machined dies. A good developing prospect about these dies has been shown.
分析了传统电火花加工工艺在模具制造中存在的主要问题，介绍了高速铣削技术加工模具的优越性和局限性。
The problems causing by technology of traditional EDM existing in mold process were analyzed. The advantage and limitation of HSM were introduced.
它解决了已有的多层连接管件存在的制造工艺复杂、加工模具难度大、成本高、吸收噪音不理想以及连接管件与管子之间密封效果不理想的问题。
Compared with available multi-layered pipe union, the present invention has simple manufacturing process, low cost, high noise absorbing performance and high sealing effect.
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