positional tolerance

简明释义

位置公差

英英释义

例句

1.A tighter positional tolerance can increase manufacturing costs due to higher precision requirements.

更严格的位置公差可能会因为更高的精度要求而增加制造成本。

2.The positional tolerance in this design allows for some flexibility during assembly.

这个设计中的位置公差允许在组装过程中有一定的灵活性。

3.Quality control checks often focus on verifying positional tolerance in manufactured parts.

质量控制检查通常侧重于验证制造部件的位置公差。

4.Without proper positional tolerance, parts may not fit together as intended.

如果没有适当的位置公差，部件可能无法按预期组合在一起。

5.The engineer specified a positional tolerance for the hole to ensure accurate alignment of the components.

工程师为孔指定了位置公差，以确保组件的准确对齐。

作文

In the world of engineering and manufacturing, precision is key. One of the critical concepts that engineers must understand is positional tolerance. This term refers to the permissible variation in the location of a feature from its true position. In simpler terms, it defines how far a part can deviate from its intended location while still being acceptable for assembly and function. Understanding positional tolerance is crucial for ensuring that components fit together correctly, especially in complex assemblies where multiple parts interact with one another.The importance of positional tolerance cannot be overstated. For example, consider the assembly of a car engine. Each component, from the pistons to the crankshaft, must be manufactured within specific tolerances to ensure that they operate smoothly together. If one part is out of tolerance, it can lead to increased wear, reduced efficiency, or even catastrophic failure. Therefore, engineers use positional tolerance to define the acceptable limits for each feature's location, which helps maintain the overall integrity of the assembly.To illustrate how positional tolerance works, let’s take a look at a simple example. Imagine a hole that needs to be drilled in a metal plate. The engineering drawing specifies that the hole should be located at a certain coordinate. However, due to manufacturing processes, it may not be possible to drill the hole exactly at that coordinate. Instead, engineers apply positional tolerance to allow for some deviation. For instance, the drawing might indicate that the hole can be off by plus or minus 0.5 millimeters. This means that as long as the hole is within that range, it will still be acceptable for assembly purposes.Moreover, positional tolerance is often represented in engineering drawings using geometric dimensioning and tolerancing (GD&T) symbols. These symbols provide a clear and concise way to communicate tolerances to manufacturers and inspectors. By using GD&T, engineers can specify not only the allowable deviation in position but also the relationship between features, such as whether they need to be parallel or perpendicular to one another. This level of detail is essential for complex assemblies where multiple parts must fit together precisely.In conclusion, understanding positional tolerance is vital for anyone involved in engineering and manufacturing. It ensures that components are produced with the necessary precision to function correctly in an assembly. By allowing for acceptable variations in the location of features, positional tolerance helps prevent costly errors and failures in products. As technology advances and manufacturing processes become more sophisticated, the need for precise definitions of tolerances will only continue to grow. Engineers must be well-versed in these concepts to design effective and reliable products that meet the demands of today's market.

在工程和制造的世界中，精度至关重要。工程师必须理解的一个关键概念是位置公差。这个术语指的是特征从其真实位置的允许变动。简单来说，它定义了一个部件在仍然可以接受组装和功能的情况下，能够偏离其预定位置的距离。理解位置公差对于确保组件正确配合至关重要，尤其是在多个部件相互作用的复杂组件中。位置公差的重要性不容低估。例如，考虑汽车发动机的组装。每个组件，从活塞到曲轴，必须在特定的公差范围内制造，以确保它们能够顺利地一起工作。如果某个部件超出公差范围，可能会导致磨损增加、效率降低，甚至灾难性的故障。因此，工程师使用位置公差来定义每个特征位置的可接受限制，这有助于维持整体组件的完整性。为了说明位置公差的工作原理，让我们看一个简单的例子。想象一下需要在金属板上钻一个孔。工程图纸上规定该孔应位于某个坐标。然而，由于制造过程，可能无法将孔精确地钻在该坐标上。相反，工程师应用位置公差以允许一些偏差。例如，图纸可能指示该孔可以偏移正负0.5毫米。这意味着只要孔在该范围内，它仍然可以接受用于组装的目的。此外，位置公差通常在工程图纸中使用几何尺寸和公差（GD&T）符号表示。这些符号提供了一种清晰简洁的方式与制造商和检查员沟通公差。通过使用GD&T，工程师不仅可以指定位置的允许偏差，还可以指定特征之间的关系，例如它们是否需要平行或垂直。这种细节水平对于多个部件必须精确配合的复杂组件至关重要。总之，理解位置公差对任何参与工程和制造的人都是至关重要的。它确保组件以必要的精度生产，以便在组装中正常工作。通过允许特征位置的可接受变化，位置公差有助于防止产品中的昂贵错误和故障。随着技术的进步和制造过程的日益复杂，对公差的精确定义的需求只会不断增加。工程师必须精通这些概念，以设计出有效且可靠的产品，以满足当今市场的需求。