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镀锌管行业中“尺寸超差”指的是什么?

来源:http://www.n-impact20.com

【 发布于:2019-04-27 15:07:14 】


尺寸超差或叫尺寸超出标准的允许倾向。此处的"尺寸"主要指钢管的外径和壁厚。通常有人把尺寸超差习气叫"公差出格",这种把倾向和公差同等起来的叫法是不严密的,应叫"倾向出格"。此处的倾向可能是"正"的,也可能是"负"的,很少在同一批钢管中呈现"正、负"倾向均出格的现象。

Dimensional deviation or the permissible tendency to exceed the standard。 The "size" here mainly refers to the outer diameter and wall thickness of steel pipe。 Usually, some people call the habit of oversize size "out of tolerance", which is not strict in equating inclination with tolerance, and should be called "out of tolerance"。 The tendency here may be "positive" or "negative"。 Very few of the steel tubes in the same batch show the phenomenon of "positive" and "negative" tendencies。

产品外形尺寸超出了产品标准规则的公差范围。是金属塑性加工产品的一种质量缺陷。产品都有一定的外形和尺寸,并且允许在一定范围内动摇。产品标准上规则的外形尺寸允许动摇的范围叫公差。尺寸在公差范围内的产品属合格品,超出公差的为不合格品、等外品或废品。标准上规则的公差是消费单位和运用单位都能接受的尺度,是产品交货的依据。外形尺寸包括断面尺寸和长度尺寸。断面尺寸指圆钢的直径,方钢的边长和对角线长,扁钢的厚度和宽度,钢板的厚度和宽度、同板差、板形和边部减薄(见板形缺陷)、钢管的外径和壁厚。各种外形尺寸的超差有不圆度、脱方、弯曲度、改动、瓢曲、波浪度、镰刀弯、板卷的塔形、异形材的轴线垂直度、带棱角产品的棱角缺肉、板凸度、同板差、三点差、同条差(见板形缺陷)、壁厚不均、竹节等。

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The dimension of the product outline is beyond the tolerance range of the product standard rules。 It is a quality defect of metal plastic processing products。 Products have a certain shape and size, and allow shaking within a certain range。 The allowable range of the regular size of the product standard is called tolerance。 Products within tolerance range are qualified products, and those beyond tolerance are unqualified products, foreign products or waste products。 标准上规则的公差是消费单位和运用单位都能接受的尺度,是产品交货的依据。 The shape size includes section size and length size。 Section size refers to the diameter of round steel, the edge length and diagonal length of square steel, the thickness and width of flat steel, the thickness and width of steel plate, the difference between the same plate, the shape and edge thinning (see flatness defects), the outer diameter and wall thickness of steel pipe。 Over-tolerance of various shapes and sizes includes roundness, deflection, bending, modification, ladle bending, waviness, sickle bending, tower shape of plate coil, axis perpendicularity of profiled material, angular defect of products with edges and corners, convexity of plate, same plate difference, three-point difference, same strip difference (see plate shape defect), uneven wall thickness, bamboo joint, etc。

望文生义,尺寸超越了规则的范围,普通多用于在机械加工;

The size is beyond the scope of the rules。 It is usually used in mechanical processing。

关于尺寸精度恳求较高的普通都中止标注比如φ10±0。025,形位公差的恳求比如同轴度公差0。01等等;

On the request for higher dimensional accuracy, the general stop marking such as 10 +0。025, the request for form and position tolerance such as coaxiality tolerance 0。01, etc。

当不标注公差时就是自由公差,由加工设备保证,GB/T1804规则了线性尺寸的公差范围也就是自由公差。

When the tolerance is not marked, it is free tolerance. Guaranteed by the processing equipment, GB/T 1804 regulates the tolerance range of linear dimension, that is, free tolerance.

尺寸超差普通是由操作不当或工艺不适构成的。

Dimensional overshoot is usually caused by improper operation or improper process.



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