请教个菜的问题，天圆地方怎么做出来。

computer

就是说上表面是个圆形，下表面是个正方形。下面是EB文件。

computer

我是说用实体做，我用的V2版。还望大侠们把详细做法写明。谢谢。

azhang

生成－智能图素－放样－截面数2－轮廓定位选直线－分别把两截面作为园和方
<img src="attachments/dvbbs/2003681654731851.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2003681654731851.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/20036816542343282.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/20036816542343282.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

computer

V2里面好像不是这样子的吧。

computer

我知道了，我知道了，谢谢谢谢谢谢谢谢.............

chendz

使用两截面放样特征不行：

<img src="attachments/dvbbs/2003682111136210.png" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2003682111136210.png\');}" onmousewheel="return imgzoom(this);" alt="" />

haubest

楼主要的大概是这个样子，但还不是完全对。<img src="attachments/dvbbs/20036821341991963.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/20036821341991963.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

chendz

用孔类圆锥体对棱锥体除料也不行：
<img src="attachments/dvbbs/2003682140416680.png" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2003682140416680.png\');}" onmousewheel="return imgzoom(this);" alt="" />


要构造一个扫描曲面，一个点在四方顶点，一条导动线为上面圆，实体设计确实为难。

haubest

圆锥体棱锥体斜面的交线是抛物线形，而题目是直线，确实不好做。换句话说，也就是四个角的过渡不能是圆弧，否则就不能产生直线交线。

computer

haubest说的有道理，到底怎么做出来呢，还请大侠们想办法。

7楼是不是用圆锥体除料做出来的。

[此贴子已经被作者于2003-6-9 16:00:13编辑过]

haubest

我的并没有完全按要求做，因此没有把结构树贴上，以免误人。我是做了一个四方锥台，采用变圆角过渡，上面半径35，下面半径0，但这样在最上部有些问题。

playerx6

恩!又学了

阿文

把圆分成四份断点在45度线上，再用放样，
和线切割割上下异形一样。

computer

按13楼的作法，还是做不出来。

haubest

13楼的做法不可取，与两截面放样没有太大的区别。

computer

对，而且按13楼的作法，有时候会出来扭转的问题。
建议版主置顶，请求解答。

cai888

用的是变半径圆角的方法，只不过要算一下，数学一直不好，现在终于体会到数学的重要了，上次算足球也是。

要用到实体表面，面的移动。大家可以做做看。

上面应该不是圆，否则不能展开。

<img src="attachments/dvbbs/20036131021230631.png" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/20036131021230631.png\');}" onmousewheel="return imgzoom(this);" alt="" />

[此贴子已经被作者于2003-6-13 10:25:37编辑过]

cai888

这个是用制造工程师的曲面做的。上面是圆，明显不对，但也贴出来吧。

这个方向看还可以
<img src="attachments/dvbbs/200361310233558450.png" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/200361310233558450.png\');}" onmousewheel="return imgzoom(this);" alt="" />

从这个方向可以发现不对。
<img src="attachments/dvbbs/200361310231683378.png" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/200361310231683378.png\');}" onmousewheel="return imgzoom(this);" alt="" />

computer

请教17楼大侠，是怎么做出来的。

cai888

要用移动表面啊，关键是计算，其实我由于计算不准确，高度并不准确，差了1MM多，你先按我的提示做下，实在不行我再贴步骤。