2024年4月13日发(作者：)

零件定位精基准的选择原则

英文回答：

Principles for Selecting Datum Features for Part

Positioning.

Datum features play a crucial role in part positioning

during assembly and manufacturing processes. The selection

of appropriate datum features is essential to ensure

accuracy, precision, and interchangeability. The following

principles guide the selection of datum features:

1. Functional Definition: The datum feature should be

the surface or edge that the part will contact or mate with

during its intended use. This ensures that the part will be

correctly positioned relative to the mating component.

2. Geometric Form: The datum feature should be a flat

surface, cylindrical surface, or plane that can be

accurately measured and referenced. Avoid using complex or

irregular surfaces as datum features.

3. Accessibility: The datum feature should be easily

accessible for measurement and referencing. This

facilitates accurate alignment and avoids potential errors.

4. Invariance: The datum feature should remain

unchanged during manufacturing and assembly processes. This

ensures that the part will be positioned correctly

regardless of variations in the manufacturing process.

5. Stability: The datum feature should be rigid and

stable under the forces applied during assembly. This

prevents deformation and ensures accurate positioning.

6. Multiple Considerations: In cases where multiple

datum features are required, consider the relationship

between them. They should be oriented perpendicularly or

параллельно to each other to minimize errors.

7. Interference Avoidance: Ensure that the datum

features do not interfere with the part's function or other

design elements. This avoids potential conflicts or

limitations.

8. Minimization of Variation: Select datum features

that minimize the cumulative effect of tolerances on part

positioning. This enhances accuracy and reduces the risk of

assembly errors.

9. Industry Standards: Adhere to industry standards or

established best practices for the selection of datum

features. This ensures consistency and compatibility with

other components.

中文回答：

零件定位精基准选择的原则。

零件定位精基准在装配和制造过程中发挥着至关重要的作用。

选择合适的定位精基准对于确保零件的精度、准确性和互换性至关

重要。以下是零件定位精基准选择的原则：

1. 功能定义，定位精基准应该是零件在预期用途下与之接触或

配合的表面或边。这确保零件相对于配合零件正确定位。

2. 几何形状，定位精基准应该是可以准确测量和引用的平面、

圆柱表面或平面。避免使用复杂或不规则的表面作为定位精基准。

3. 可达性，定位精基准应该便于测量和引用的。这有助于准确

对齐，避免潜在的错误。

4. 不变性，定位精基准在制造和装配过程中应该保持不变。这

确保了零件无论制造过程如何变化，都能正确定位。

5. 稳定性，定位精基准在装配过程中受到的力作用下应该坚固

且稳定。这防止变形，确保准确定位。

6. 多重考虑，在需要多重定位精基准时，考虑它们之间的关系。

它们应该相互垂直或平行，以最大程度地减少误差。

7. 避免干涉，确保定位精基准不会干扰零件的功能或其他设计

元素。这避免了潜在的冲突或限制。

8. 变化最小化，选择定位精基准，以最大程度地减少公差对零

件定位的累积影响。这增强了精度并降低了装配错误的风险。

9. 行业标准，遵守行业标准或已建立的选择定位精基准的最佳

实践。这确保了与其他零件的一致性和兼容性。