求高手 热加工专业英语翻译（铸造类的） 专业翻译，勿使用软件翻译 谢谢

求高手 热加工专业英语翻译（铸造类的） 专业翻译，勿使用软件翻译 谢谢
As metal solidifies and cools,it shrinks and contracts in size.To compensate for this,a pattern is made larger than the finished casting by an amount called shrinkage allowance. Although contraction is volumetric,the correction for it is usually expressed linearly. Dimensions are not shown oversize on a part or patter drawing to allow for shrinkage, but the patternmaker measures to the finished dimensions with shrink rules.Such a rule has a scale that is longer than standard by a definite proportion such as 5,10,or 15mm/m.Shrinkage is different for different metals,different shapes of castings of the same metal, and different molding and casting methods.
Other Allowances.Machining allowance is the amount by which dimensions on a casting are made oversize to previde stock for machining.Dimensions on a pattern drawing include machining allowance.The amount of metal left for machining must be no more than necessary but enough to assure that cutters can get an ample cut beneath and completely remove the hard scale and skin on the surface of the casting.What is sufficient depends upon the kind of metal,the shape of the casting,and the methods of casting, cleaning,and machining.
Distortion allowance may be added to dimensions of certain objects such an large flat piates and U-shaped castings that are expected to warp on cooling.The purpose of this allowance is to displace the pattern in such a way that the casting will be of the proper shape and size after it distorts in process.