3)  NURBS are not justified appearance strip runin curve treating
    Seven, safe quick-cutting mould problem
    1） Monitoring wearing a cutter away and destroying;
    2） Intensity that the bit links;
    3） Strict with the machine tool and the cutter examination is very important and before the average machine tool processing persity , safety protects and starts up.
    Eight, there exists problem in our country at present in adopt high speed to process the mould technology
    1 machine tool:
    1) domestic high-speed machine tool overall function still has the gap , the function component function to be able to not satisfy a request. Power and rotation rate including the electricity chief axis, entrance machine tool price is high;
    2）Under the machine tool high speed, the dynamic behaviour studies the function being not enough to affect a complete machine as a result,;
    3）The five scroll of machine tool is not enough mature , entrance machine tool price is very high;
    4) supporting technology and equipment are fairly incomplete
    2 cutters:
    1) domestic cutter is not able to adapt to the quick-cutting application , high speed cuts only entire treating especially stiffly. Entrance cutter price is high. The cutter technology is to affect quick-cutting processing a key factor of mould.
    2) supporting technologies are not enough to include hilt , online dynamic balance in complete set etc..
    3 high speed moulds process the technology and the experiment
    1) Be short of the accumulation applying experience since high speed processes the mould history comparatively shortly,;
    2）The comparison studying comparison stops throwing into lack, sets up a project to quick-cutting handicraft is difficult;
    3) Be short of the quick-cutting data base or the handbook , is still blank space at present;
    4) moulds produce the manufacturer cognition lack to quick-cutting , the analysis contrast being short of long range beneficial result;
    4 Be short of the quick-cutting automation programming software;
    5 Be short of a five scroll of gear quick-cutting automation programming CAM software.
Concluding remark
    The mould marketplace has the intense need, but technology to be unable to keep abreast
    with to high speed treating. Starting is late, the basis is relatively poor , overall engineering
    level not being taller than , develops slowlyRequire that one by one, aspect coordinated
    growth , the product mimic inkstone throwing into combining with enlarging, each
    comprehensive utilization aspect strengths drive quick-cutting application in making in the
    mould.. Our hope , effort passing every aspect, before the market demand push go down ,
    pass technological progress, look like automobile , machine tool , home appliance , before
    long, not only our country being going to become a mould producing Great Power, and be
    going to become a mould producing the powerful country.

    References
    1. Jin Diecheng, Song Fangzhi. The modern mould makes the technology, Beijing: Mechanical industry press, 2001.
    2,.Xu Hefeng, The digitization mould makes the technology , Beijing: Chemical industry press, 2001.
    3.Zhao Bo ,High speed processes the forward position technology that the mould processes. Mould technology, 2000, (2) 模具制造加工英文文献和中文翻译(5):http://www.751com.cn/fanyi/lunwen_7334.html