08.装配2 - CadQuery 中文文档

PointInPlane

PointInPlane 将第一个对象的中心定位在第二个对象定义的平面内。
The cost function is:

m_96c36706c2abdc52c1e51db6f8d113a7_r.png

Where:

m_704dc183e32ae940421393152193554e_r.png

m_db7e00e3b989a470752152537b7fed11_r.png

import cadquery as cq

# Create an L-shaped object:
bracket = (
    cq.Workplane("YZ")
    .hLine(1)
    .vLine(0.1)
    .hLineTo(0.2)
    .vLineTo(1)
    .hLineTo(0)
    .close()
    .extrude(1)
    # tag some faces for easy reference:
    .faces(">Y[1]")
    .tag("inner_vert")
    .end()
    .faces(">Z[1]")
    .tag("inner_horiz")
    .end()
)

box = cq.Workplane().box(0.5, 0.5, 0.5)

assy = cq.Assembly()
assy.add(bracket, name="bracket", color=cq.Color("gray"))
assy.add(box, name="box", color=cq.Color("green"))

# lock bracket orientation:
assy.constrain("bracket@faces@>Z", "box@faces@>Z", "Axis", param=0)
assy.constrain("bracket@faces@>X", "box@faces@>X", "Axis", param=0)

# constrain the bottom of the box to be on the plane defined by inner_horiz:
assy.constrain("box@faces@<Z", "bracket?inner_horiz", "PointInPlane")
# constrain the side of the box to be 0.2 units from the plane defined by inner_vert
assy.constrain("box@faces@<Y", "bracket?inner_vert", "PointInPlane", param=0.2)
# constrain the end of the box to be 0.1 units inside the end of the bracket
assy.constrain("box@faces@>X", "bracket@faces@>X", "PointInPlane", param=-0.1)

assy.solve()
show_object(assy)

PointOnLine

PointOnLine 将第一个对象的中心定位在第二个对象定义的线上。

The cost function is:

m_a67968fcc3368abab33f91b24f19e023_r.png

Where:

m_92d4da25da35580e3f78aa724b48e4d1_r.png

m_61d3c993cbd593cf406d6507c6ce04e6_r.png

import cadquery as cq

b1 = cq.Workplane().box(1, 1, 1)
b2 = cq.Workplane().sphere(0.15)

assy = (
    cq.Assembly()
    .add(b1, name="b1")
    .add(b2, loc=cq.Location((0, 0, 4)), name="b2", color=cq.Color("red"))
)

# fix the position of b1
assy.constrain("b1", "Fixed")
# b2 on one of the edges of b1
assy.constrain("b2", "b1@edges@>>Z and >>Y", "PointOnLine")
# b2 on another of the edges of b1
assy.constrain("b2", "b1@edges@>>Z and >>X", "PointOnLine")
# effectively b2 will be constrained to be on the intersection of the two edges

assy.solve()
show_object(assy)

FixedPoint

FixPoint 将给定参数的位置固定为等于通过约束参数指定的给定点。该约束锁定了参数的所有平移自由度。

The cost function is:

m_d8c82f564efad47ce2cf74f93dc06b92_r.png

Where:

m_ce8d22c618ddce35254ebb42bb48ee28_r.png

m_158c618f3324b539557f3a748b4112e8_r.png

import cadquery as cq

b1 = cq.Workplane().box(1, 1, 1)
b2 = cq.Workplane().sphere(0.15)

assy = (
    cq.Assembly()
    .add(b1, name="b1")
    .add(b2, loc=cq.Location((0, 0, 4)), name="b2", color=cq.Color("red"))
    .add(b1, loc=cq.Location((-2, 0, 0)), name="b3", color=cq.Color("red"))
)

pnt = (0.5, 0.5, 0.5)

# fix the position of b1
assy.constrain("b1", "Fixed")
# fix b2 center at point
assy.constrain("b2", "FixedPoint", pnt)
# fix b3 vertex position at point
assy.constrain("b3@vertices@<X and <Y and <Z", "FixedPoint", pnt)

assy.solve()
show_object(assy)

FixedRotation

FixRotation 将给定参数的旋转固定为等于通过约束参数指定的值。

此约束锁定参数的所有旋转自由度。

The cost function is:

m_72c1cbc753ec535b3c2ef9d457ede665_r.png

Where:

m_79fae4acd88c21cecca97b68c82ba120_r.png

m_5ba31d071657f1950c7a32cd9b0ae2cf_r.png

m_5e3c2c74164306e52cb40c57405e2943_r.png

import cadquery as cq

b1 = cq.Workplane().box(1, 1, 1)
b2 = cq.Workplane().rect(0.1, 0.1).extrude(1, taper=-15)

assy = (
    cq.Assembly()
    .add(b1, name="b1")
    .add(b2, loc=cq.Location((0, 0, 4)), name="b2", color=cq.Color("red"))
)

# fix the position of b1
assy.constrain("b1", "Fixed")
# fix b2 bottom face position (but not rotation)
assy.constrain("b2@faces@<Z", "FixedPoint", (0, 0, 0.5))
# fix b2 rotational degrees of freedom too
assy.constrain("b2", "FixedRotation", (45, 0, 45))

assy.solve()
show_object(assy)

FixedAxis

FixAxis 将给定参数的法线或切线的方向固定为等于通过约束参数指定的向量的方向。
此约束锁定参数的两个旋转自由度。

成本函数为：

m_899a929b83040f4810c7bf94811ca020_r.png

在哪里：

m_529408a5a487ddb80851d074faeebe1a_r.png

m_5822215839b18a96e3565d035b65cf47_r.png

import cadquery as cq

b1 = cq.Workplane().box(1, 1, 1)
b2 = cq.Workplane().rect(0.1, 0.1).extrude(1, taper=-15)

assy = (
    cq.Assembly()
    .add(b1, name="b1")
    .add(b2, loc=cq.Location((0, 0, 4)), name="b2", color=cq.Color("red"))
)

# fix the position of b1
assy.constrain("b1", "Fixed")
# fix b2 bottom face position (but not rotation)
assy.constrain("b2@faces@<Z", "FixedPoint", (0, 0, 0.5))
# fix b2 some rotational degrees of freedom too
assy.constrain("b2@faces@>Z", "FixedAxis", (1, 0, 2))

assy.solve()
show_object(assy)