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高频焊管外毛刺刮削机构的改进
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作者 乔秀彦 《钢管》 CAS 1998年第3期42-43,共2页
简介了改进的高频焊管外毛刺刮削机构的设计特点。该机构采用凸轮机构来实现刮刀的快速升降,手动操作,结构简单,适于中小型高频焊管机组。
关键词 高频焊管 外毛刺 刮削机构 焊管机
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HFW焊管去外毛刺刀具材料性能探讨
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作者 贾熙 《焊管》 2020年第6期35-38,48,共5页
为了提高HFW焊管去外毛刺刀具的刮削能力和使用寿命,通过外毛刺刮除试验对比了高速钢和硬质合金两类主要刀具材料的热硬性。结果显示,高速钢刀具具有良好的韧性,但是由于热硬性仅能达到600℃(硬度>60HRC),无法适应热熔外毛刺超高的... 为了提高HFW焊管去外毛刺刀具的刮削能力和使用寿命,通过外毛刺刮除试验对比了高速钢和硬质合金两类主要刀具材料的热硬性。结果显示,高速钢刀具具有良好的韧性,但是由于热硬性仅能达到600℃(硬度>60HRC),无法适应热熔外毛刺超高的切削温度,因而发生快速磨损,丧失切削能力;YT类硬质合金刀具具有较高的热硬性,在约1000℃高温条件下仍能继续切削,再配合使用可转位机夹式刮刀,能够获得良好的刀身韧性,避免了焊接式刮刀因刀头高温焊接产生内应力等缺陷,而且换刀便捷。研究表明,采用硬质合金刀片的可转位机夹式刮刀是去外毛刺刀具的最佳选择,可同时兼顾刀具的高温硬度和抗冲击性能,在HFW焊管外毛刺处理过程中表现出了良好的刮削能力和经济性。 展开更多
关键词 HFW焊管 外毛刺 刀具 高速钢 硬质合金 热硬性
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小型热力去毛刺机
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《中国高校科技》 1996年第12期15-16,共2页
主要内容:热力去毛刺机是利用氢、氧气体瞬时爆燃释放出的热能(瞬时高温3100℃)将毛刺烧掉。由于H<sub>2</sub>、O<sub>2</sub>爆燃时间极短,毛刺被烧掉,而零件表面光洁度、硬度。
关键词 热力去毛刺 表面光洁度 毛刺 微机控制 金相组织 平均无故障时间 外毛刺 瞬时高温 主要内容 成果评价
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Comparing twist-drill drainage with burr hole drainage for chronic subdural hematoma 被引量:3
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作者 LIN Xin 《Chinese Journal of Traumatology》 CAS 2011年第3期170-173,共4页
Objective: of chronic subdural hematoma The surgical management (CSDH) is still a controversial issue, and a standard therapy has not been established because of the unclear pathogenic mechanisms in CSDH. The inten... Objective: of chronic subdural hematoma The surgical management (CSDH) is still a controversial issue, and a standard therapy has not been established because of the unclear pathogenic mechanisms in CSDH. The intention of this paper is to find a simple and efficient surgical procedure for CSDH. Methods: A retrospective study of 448 patients with CSDH by surgical treatment during 2005 to 2009 was conducted in order to compare the efficiency between two diferent primary surgical methods, i.e. twist-drill drainage without irrigation in Group A (n-178) and one burr-hole with irrigation in Group B (n=270). The results were statistically analyzed. Results: The reoperation rates in Group A and Group B were 7.9% and 11.9% respectively. The good outcome rate was 88.8% and 73.5%, the complicatiGn was 7.9% and 20.7% in Group A and Group B, respectively. Conclusions: The burr-hole drainage with irrigation of the hematoma cavity is not beneficial to the outcome and prognosis. Irrigation is not important in the surgical treatmerit for CSDH. Thus in initial treatment, twist-drill drainage without irrigation of the hematoma cavity is recommended because it is relatively safe, time-saving and cost-effective. 展开更多
关键词 Hematoma subdural Brain injury CHRONIC Drainage
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