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產(chǎn)品加工工藝的合理性
1．構(gòu)成輪廓的幾何條件
在車削加工中手工編程時，要計算每個節(jié)點坐標(biāo)；在自動編程時，要對構(gòu)成輪廓所有幾何元素進行定義。因此在分析圖時應(yīng)注意：
（1）圖上是否漏掉某尺寸，使其幾何條件不充分，影響到輪廓的構(gòu)成；
（2）圖上的圖線位置是否模糊或尺寸標(biāo)注不清，使編程無法下手；
（3）圖上給定的幾何條件是否不合理，造成數(shù)學(xué)處理困難。
（4）圖上尺寸標(biāo)注方法應(yīng)適應(yīng)數(shù)控車床加工的特點，應(yīng)以同一基準(zhǔn)標(biāo)注尺寸或直接給出坐標(biāo)尺寸。
2．尺寸精度要求
分析圖樣尺寸精度的要求，以判斷能否利用車削工藝達(dá)到，并確定控制尺寸精度的工藝方法。
在該項分析過程中，還可以同時進行一些尺寸的換算，如增量尺寸與對尺寸及尺寸鏈計算等。在利用數(shù)控車床車削時，常常對要求的尺寸取最大和比較小極限尺寸的平均值作為編程的尺寸依據(jù)。
3．形狀和位置精度的要求
圖樣上給定的形狀和位置公差是保證精度的重要依據(jù)。加工時，要按照其要求確定的定位基準(zhǔn)和測量基準(zhǔn)，還可以根據(jù)數(shù)控車床的特殊需要進行一些
4．表面粗糙度要求
表面粗糙度是保證表面微觀精度的重要要求，也是合理選擇數(shù)控車床、刀具及確定切削用量的依據(jù)。
5．材料與熱處理要求
圖樣上給定的材料與熱處理要求，是選擇刀具、數(shù)控車床型號、確定切削用量的依據(jù)。
Rationality of Product Processing Process
1. Geometrical conditions for the composition of an outline
When manual programming is done in turning, the coordinates of each node must be calculated; When programming automatically, all the geometric elements that make up the contour are defined. Therefore, when analyzing the map, it should be noted that:
(1) Whether a certain size is missing on the figure, making its geometric conditions insufficient, affecting the composition of the outline;
(2) Whether the position of the graph line on the graph is blurred or the size is unclear, so that the programming can not start;
(3) Whether the given geometric conditions on the graph are unreasonable makes mathematical processing difficult.
(4) The dimensional marking method on the figure should adapt to the characteristics of NC lathes. It should be marked with the same reference or directly give the coordinate size.
2. Size accuracy requirements
This paper analyzes the requirements of size accuracy of the pattern to determine whether it can be achieved by turning technology and to determine the process method for controlling size accuracy.
In the process of this analysis, some dimensions can be converted at the same time, such as incremental size and absolute size and size chain calculation. When turning a CNC lathe, the average of the required maximum and minimum limit dimensions is often taken as the programming size basis.
3. Requirements for shape and position precision
The shape and position tolerance given on the pattern is an important basis for ensuring accuracy. When processing, according to its requirements to determine the positioning benchmarks and measurement benchmarks, but also according to the special needs of CNC lathes to carry out some
4. Surface roughness requirements
Surface roughness is an important requirement to ensure surface microscopic accuracy, and it is also the basis for reasonably selecting CNC lathes and cutters and determining the cutting amount.
5. Material and heat treatment requirements
The material and heat treatment requirements given on the pattern are the basis for selecting tools, CNC lathe models, and determining the cutting amount.