菜单
  

    ing is very difficult and these types need a fixture with very high
    accuracy.
    With respect to the realization difficulty of the accuracy,
    when functionally connected surfaces are machined in separate
    clampings, the connecting types can be pided into two types:
    loosely and strictly tolerance-related connections (Fig. 2).
    The group of loosely tolerance-related connections consists
    of accuracy-related requirements, which can be achieved rela-
    tively easily even in cases when the connected surfaces are ma-
    chined in two separate clampings. In the case of these functional
    connecting types the fixture accuracy is critical only with respect
    to parallelism or perpendicularity to the machine table.
    The group of strictly tolerance-related connections consists
    of accuracy-related requirements which can be achieved only
    with difficulty in cases when the connected surfaces are ma-
    chined in two separate clampings. They need a high accuracy of
    the fixture and of the locating elements of the workpiece. For
    these connecting types the connected surfaces need to be ma-
    chined in one clamping or, such surfaces should be machined in
    two separate clampings, only when there is no other solution.
    The faces of a workpiece, depending on the surfaces they
    contain, have appropriate attributes. The face is: “machined”
    when it contains a machined surface, it is “connected” when
    it contains a connected surface, it is “strictly connected” when
    it contains a strictly connected surface, and it is “loosely con-
    nected” when it contains a loosely connected surface.3 Identification of the locating and clamping entities
    3.1 Plane locating types of the workpiece
    Determining of the plane locating types was with the help of
    the analysis of technological facilities of horizontal machining
    centers and existing clamping fixtures. There are three types of
    plane locations (Fig. 4): horizontal (denoted with “pos1”), verti-
    cal (“pos2”), and vertical with partial machining of the locating
    face (“pos3”).
    The selection of a plane locating face with a given plane lo-
    cating type determines the set of workable faces.
    3.2 Side locating types
    From an analysis of existing clamping fixtures and the corres-
    ponding literature, there are four basic types of side location
    (Fig. 5) [8, 10]:
    (1) Side location by using surfaces, which are on the adjoin-
    ing faces of the plane locating face
    (2) Side location using two inside diameter on the plane lo-
    cating face
    (3) Side location by using one inside diameter on the plane
    locating face and a face on one of the adjoining faces(4) Side location by using two threaded joints on the plane
    locating face
    3.3 Clamping types
    According to the direction of clamping forces, the clamping can
    be perpendicular to the plane locating surface (type s1) or paral-
    lel with the plane locating surface (type s2). The basic type s1,
    depending on the location of clamping faces, can be further di-
    vided into subtypes s11, s12, and s13. In the case of s11, the
    clamping surfaces are on the adjoining sides of the plane locating
    face. In the case of s12, the clamping surface (or surfaces) is on
    the opposite side of the plane locating face, and in type s13, the
    clamping is on the through hole (Fig. 6).
    One of the specific ways of clamping is clamping by screws
    and threaded joints on the plane locating face which is called
    type s3.
    The number of clamping points is also a very important char-
    acteristic of clamping. According to the number of clamping
    points, clamping is differentiated in one, two, three, and four
    points. Adding these to the previous basic types, the possible
  1. 上一篇:涡轮机叶片的铣削英文文献和翻译
  2. 下一篇:带式传输系统英文文献和中文翻译
  1. 汽车乘员舱的声振耦合英文文献和中文翻译

  2. 立体光照成型的注塑模具...

  3. 低频振动的铁路车轴的状...

  4. 接头的形状对沥青塞接头...

  5. 电-气动驱动的垂直计算机...

  6. 开口端纺纱系统中的锥形...

  7. 金属板料冲压模具计算机...

  8. 中考体育项目与体育教学合理结合的研究

  9. 酸性水汽提装置总汽提塔设计+CAD图纸

  10. java+mysql车辆管理系统的设计+源代码

  11. 当代大学生慈善意识研究+文献综述

  12. 十二层带中心支撑钢结构...

  13. 杂拟谷盗体内共生菌沃尔...

  14. 大众媒体对公共政策制定的影响

  15. 乳业同业并购式全产业链...

  16. 电站锅炉暖风器设计任务书

  17. 河岸冲刷和泥沙淤积的监测国内外研究现状

  

About

751论文网手机版...

主页:http://www.751com.cn

关闭返回