|
【20160406】Kinematic inversion
5 _# ^4 b: { O" t( B運(yùn)動(dòng)倒置 x6 S5 ?8 Y6 k
9 {8 t) j* J% R0 ^The cam will be imagined as being stationary./ B# {+ i. ?% u& v& L3 A+ d
The follower then should be rotated opposite to the direction of cam rotation.1 R3 o% h& p% Z& a& ~( B8 t# t1 @
The desired location for the follower, at several positions, is constructed from the base circle.
/ u8 H9 ^0 e" b' i' ?/ a8 M假定凸輪不動(dòng),從動(dòng)件沿相反方向轉(zhuǎn)動(dòng),在基圓上畫(huà)出從動(dòng)件的幾個(gè)預(yù)期運(yùn)動(dòng)位置。
- v E* R: t/ t3 U' B1 p$ C" s, k; f! V" @6 D* T
To creating the cam shape: wrapping the displacement diagram around the base circle.
" U/ i6 d5 U/ T# _$ z設(shè)計(jì)凸輪形狀時(shí),用從動(dòng)件位移圖上的位移將基圓“包裹”起來(lái)。
. ^2 `/ R# D% z) B" k
未命名圖片.png (33.9 KB, 下載次數(shù): 55)
下載附件
2016-4-6 20:43 上傳
/ H! ^9 Z+ z @: A- s
3 ]5 s# Z5 l7 |1 J6 @& ~. u具體例子:
( [. K6 c- S9 \3 G& R7 x! _1 u① In-Line Knife-Edge Follower 對(duì)心直動(dòng)尖頂從動(dòng)件凸輪: [. c+ E* w1 W2 d. Z$ {4 V
Cha 07-2016.jpg (46.82 KB, 下載次數(shù): 54)
下載附件
2016-4-6 20:46 上傳
Cha 07-2016.jpg (18.61 KB, 下載次數(shù): 55)
下載附件
2016-4-6 20:46 上傳
+ @0 p+ f# I. o4 \! N9 x$ s3 Q
1. Draw the base circle of radius.
0 t1 A6 W) P2 o) o3 B7 @. ~2. Draw the follower in the home position.& N3 Z. W& Y: r" T! D& A
3. Draw radial lines from the center of the cam, corresponding to the cam angles identified on the displacement diagram.! B; n" V D+ s+ Z& j0 v
4. The follower will be rotated in a direction opposite to the actual cam rotation." U8 P: s2 P8 m/ T# d3 ^
5. Transfer the displacements from the displacement diagram to the radial lines.7 w* P; `( h4 q. z% b( }* E
6. Measure the displacements from the base circle.
* V5 y( ?2 a0 y
& x. ^0 `- b( W4 [ a! X4 _+ \1.畫(huà)出制定半徑的基圓。1 _- K8 I1 J1 |# d$ m/ b7 v, s7 U
2.畫(huà)出初始位置的從動(dòng)件。
" X- j6 u# T6 `6 }; C( @ _3.從中心畫(huà)出基圓的徑向線,角度與位移圖上橫軸凸輪角度相對(duì)應(yīng)。% X: H5 m* T# G& K9 l) U& Z
4.從動(dòng)件與凸輪真實(shí)運(yùn)動(dòng)方向相反。
8 W3 E E8 j% f% g* d5.將位移移到徑向線上。
0 Y" w& o8 s, o k6.測(cè)量從動(dòng)件遠(yuǎn)離凸輪基圓的距離。
% T Z* g T# I1 U- m8 H9 \
8 U" n% I2 j% }② Offset Roller Follower 偏置滾輪從動(dòng)件+ Y9 G% A' w7 g8 o& H& n3 u
Cha 07-2016.jpg (73.04 KB, 下載次數(shù): 53)
下載附件
2016-4-6 20:54 上傳
Cha 07-2016.jpg (18.43 KB, 下載次數(shù): 56)
下載附件
2016-4-6 20:54 上傳
! b- P6 }; p8 t) b. I& |1. Draw the base circle of radius.( u v$ I& @" {8 f' O- l
2. Draw the follower centerline in the home position.' \ t. @% ]0 h# u7 f
3. Draw the prime circle.
# V5 K# ]% g/ O/ O4. Draw the follower in the home position of radius.
# B" E: `- |5 C5. Draw an offset circle of radius, which will be tangent to the follower centerline.
+ A" f' [4 k7 B0 x; x% }6. Draw lines tangent to the offset circle, corresponding to the reference cam angles on the displacement diagram.
. P" m4 P2 g* {' Q7. The follower will be rotated in a direction opposite to the actual cam rotation.
5 Z" ]8 ^7 K9 J
: d% f2 } p# `+ N7 ?1.畫(huà)出制定半徑的基圓。
# K5 v/ I/ [, _% Y2.畫(huà)出初始位置的從動(dòng)件中心線。- z Z6 z# o+ D5 [
3.畫(huà)出理論廓線。$ Z& U) Q6 n$ t. w- Y
4.畫(huà)出初始位置的從動(dòng)件。
7 t4 w; W6 Y9 E/ c$ V6 N+ o+ E5.以偏心距為半徑畫(huà)圓,與從動(dòng)件中心線相切。& b9 N6 i$ A2 K. {, @1 w/ y# \
6.與偏距圓相切畫(huà)線,角度與位移圖上橫軸凸輪角度相對(duì)應(yīng)。& ~( J0 R7 A) P. D" Q+ i
7.從動(dòng)件與凸輪真實(shí)運(yùn)動(dòng)方向相反。9 E( \4 i! B# p; o8 L7 D, T
|
|