Precision machining mainly divided into three parts

Precision machining mainly divided into three parts

The first three parts precision machining, including scale accuracy, shape accuracy and orientation accuracy. The higher the degree of fit, machiningaccuracy is higher. Conversely, the lower.

    1. Scale accuracy. Practice value refers to the degree of ambition numerical diameter, length, outer space and other dimensions of machined parts relative comes near. Scale precision scale is used to control the Gongyi. Gongyi is the scale of the amount of variation in machining parts scale promised. In the same situation a fundamental scale, Gongyi smaller scale, the higher the scale accuracy. National standard GB / T1800.2-1998 rules: scale Gongyi Gongyi is divided into 20 levels, namely IT01, IT0, IT1, IT2, IT17, IT18. IT show specifications Gongyi (IT world Gongyi ISO Tolerance abbreviation), Gongyi level code to use Arabic figures indicate that from the IT01 ~ IT18, precision sequential decline in Gongyi value sequentially increases.

    2. shape accuracy. It means the line on the parts after machining, the shape of the extent of the practice fit the shape of the face and ambition. Identification of shape accuracy of the project according to GB / T1182-1996 rule, there is straightness, flatness, roundness, cylindrical, surface and line generalization generalization of degree six. Shape accuracy is to manipulate the shape of Gongyi, Gongyi various shapes, in addition to roundness, cylindrical sub-13 accuracy class, the other 12 are divided into accuracy class. Level 1 the highest and 12 the lowest.

    3. azimuth accuracy. It refers to the point of machining parts, lines, practice orientation and aspirations fit degree azimuth plane. Identification bearing precision projects according to GB / T1182-1996 rule, there are parallel, straight, tilt, concentricity, symmetry, the degree of orientation, runout and total runout, etc. 8. Azimuth accuracy azimuth error is to manipulate, and the intention to perform public position into 12 accuracy class.