拔模

它能制造没有拔模斜度和缝脊的复杂形状铸件。

This can make complex shaped castings without any draft or flash .

拔模斜度余量只有经与铸造厂商定后才能合并到尺寸公差或形位公差中。

Draft allowances can be incorporated into dimensional tolerances or geometric tolerances only upon consultation with the foundry .

此方法有效地解决了传统UV-LIGA方法中的倒拔模斜度的问题。但因直齿圆柱齿轮不允许有拔模斜度，使其挤压成形在模具设计上有一定的难度。

This method solves the problem of negative demoulding taper occured in traditional UV-LIGA . But spurs gears have some difficulties in extrusion for they have no drawing slope .

镦挤拔模斜度对成形的影响规律研究

Study on the law of influence of drafting angle on upset-extruding

法兰轴类锻件顶锻拔模斜度的设计

To design the draft angle of upsetting die for flanged axle-type forgings

冰箱瓶架属于透明盒类塑件，侧壁具有反向拔模特征。

The refrigerator bottle rack is transparent box plastic , with anti-draft-angle wall .

基于边界表示的拔模算法及其应用

Boundary Representation Based Draft Operation and Its Application

但因直齿圆柱齿轮不允许有拔模斜度，使其挤压成形在模具设计上有一定的难度。

But spurs gears have some difficulties in extrusion for they have no drawing slope .

这是由于为热膨胀效应而设置允差以及在锻模上需要拔模斜角所致。

These results from the allowances made for thermal expansion effects and the need for draft angles on the forging tools .

一方面，引入流函数法建立拉拔模的模腔曲面方程，对传统的锥形模模腔进行优化，设计出流线型拉拔模。

On one hand , author introduced stream function to establish the surface function of drawing die , optimized the traditional cone die and designed streamline die .

根据摩托车档位齿轮的产品特点，进行成型工艺分析优化，获得合理的产品精化毛坯，拔模斜度等参数，获取产品的预成型毛坯尺寸。

The rational rough and technological parameter of profile modified gear is gained by analysis and optimizing of forming , and the preliminary shaping size of product is defined .

新型精压模的上模设有顶件装置，锻件半轴的拔模斜度小，锻件半轴的金属敷料少。

There is a shedder on the upper die of the new type of finish forging die , so that pattern draft angle of half axle of forging is small , oversize for machining is little .