What is Process Size? The difference between the basic process size and the process size

The process size refers to the size that should be achieved by a certain process.

Because there is a tolerance in the size of the process, in fact, the allowance removed by the same batch of workpieces is varied, so the allowance has the basic allowance (or nominal allowance, nominal allowance), the maximum allowance and the minimum allowance. From whether the processing surface has symmetry, the process allowance is divided into unilateral allowance and bilateral margin.

The process size and tolerance are generally marked according to the "principle of entering the body", and the nominal size of the included size (such as shaft diameter) is the maximum process size, and the upper limit deviation is 0; For the inclusion size (e.g. hole diameter, groove width), the nominal size is the minimum process size, and the lower limit deviation is 0. The size of the hole spacing process and the size of the blank are generally marked according to the symmetrical deviation.

Process size: It is the processing size that should be guaranteed by each process in the processing process, usually the size between the processing surface and the positioning datum plane.

The tolerance of the operation dimension is the operation size tolerance. Correctly determining the process size and its tolerance is one of the important tasks in formulating process regulations.

The machining process of parts is the process of gradually transitioning the blank to the finished product through cutting. In this process, the process size and process allowance of each process are constantly changing, and some of the process sizes are often not marked or do not exist on the part drawings, which need to be determined when formulating the process process. There is a certain relationship between these changing process sizes, and it is necessary to use the principle of process size chain to analyze their internal relationship and grasp their change laws.

The use of dimension chain theory to reveal the relationship between these dimensions is the basis for the rational determination of process dimensions and their tolerances.

Composition of the size chain.

1 ring. Refers to each dimension included in the dimension chain. The size chain consists of at least three rings.

2 Closed loops.

In the dimensional chain, it is a link that is indirectly guaranteed during processing.

3 Composition rings.

With the exception of the closed ring, the rest are constituent rings. A change in any of the constituent rings will inevitably cause a change in the closed ring. The constituent rings are divided into two types: increasing the ring and decreasing the ring.

The main features of the size chain:

1.Closure Closure is a very important feature of the size chain, that is, the arrangement of each ring in the process size chain composed of a closed ring and a plurality of constituent rings is in a closed form. If it is not closed, it will not become a dimensional chain.

2.Correlation means that the rings of the size chain are interrelated, that is, the closed rings are affected by the changes of the constituent rings.

Process size: It is the processing size that should be guaranteed by each process in the processing process of the part, usually the size between the processing surface and the positioning datum plane.

Process size: The size that should be achieved by each process in the processing process of the part. The size that should be achieved by removing the machining allowance in one process.

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Basic process size and process size are two commonly used concepts in the manufacturing industry, and there are the following differences between the two: Definition: Basic process size refers to the dimensional relationship that must be guaranteed in the processing process of a workpiece, which is usually used to ensure the basic shape and position accuracy of the workpiece.

The process size refers to the size of a specific process that needs to be guaranteed in the processing process, which is usually used to control the machining accuracy and surface quality of the workpiece. Scope of application: The basic process size is usually applied to the entire workpiece, which is used to control the basic shape and position accuracy of the workpiece, which is generally specified in the process specification.

The process size is only applicable to a specific machining operation, and is used to control the machining accuracy and surface quality of the operation, which is usually specified in the process card or machining drawing. Control mode: The basic process size is usually controlled by basic tolerance, that is, the tolerance control method specified in the national standard is used for control.

The control of the process size requires different control methods according to the specific processing requirements and process characteristics, such as the use of special tooling and processing technology, the use of high-precision processing equipment, etc. Inspection method: The size of the basic collapse process is usually inspected by full-scale inspection or sampling inspection.

The size of the process requires more refined inspection methods, such as the use of high-precision measuring equipment such as coordinate measuring instruments and optical projectors. To sum up, there are certain differences between the basic process size and the process size in terms of definition, application scope, control mode and inspection method. In the manufacturing industry, the reasonable application of these two concepts can effectively improve the processing accuracy and surface quality of products, and improve production efficiency and product quality.

Process size is a very important part of the manufacturing industry, which can usually be understood as the geometric feature size of the part in the manufacturing process. In order to ensure that the manufactured parts meet the design requirements, the process dimensions need to be accurately calculated.

The method of calculating the size of an operation depends on the process flow and requirements, and usually includes the following steps. First, the design dimensions of the part are determined, and secondly, the shrinkage and tolerance range of the material are considered. Then, according to the processing technology and the characteristics of the processing equipment, factors such as the mating clearance, the radius and error of the cutting tool are considered.

Once all the factors have been determined, the final process dimensions can be calculated by means of formulas. In general, there are many factors to consider when calculating the size of a process, of which material and processing technology are two important aspects.

If you want to take a deeper look at the calculation of process dimensions, you can take a closer look at some related topics. For example, different calculation methods may be required for different processing methods. At the same time, in CNC machining and manual machining, there are also different calculation methods and accuracy requirements.

In addition, in the field of high-precision manufacturing, it is necessary to control the size of the process more strictly, such as using computer-aided manufacturing and other technologies to achieve high-precision machining.

In short, the calculation of process size is a crucial part of the manufacturing industry, which needs to consider a variety of factors, and at the same time, it is necessary to continuously explore innovative calculation methods and process technologies to ensure manufacturing quality and efficiency. <>

Definition of operation size:

It is the processing size that should be guaranteed by each process in the processing process, usually the size between the processing surface and the positioning datum plane.

Formation of process dimensions:

The processing size is generally the design and assembly requirements such as late, because part of the processing size on the drawing can not be completed at one time, it is necessary to reserve the processing residue for finishing and preventing heat treatment deformation, so that the process size is formed.

The difference between the process size and the processing size:

The machining size can be the size of the machining completed in one pass, or it can be the operation size of the machining allowance reserved.

The process size is generally the processing size of the reserved machining allowance.

Summary. In general, part drawings are drawn up by craftsmen and contain all the dimensions and shapes of the parts concerned. In addition, the size and location of the process are included to ensure precision and detail in production.

In addition, geometric tolerances, accuracy requirements, surface roughness, and other important information are annotated in the part drawing.

The part drawings are drawn up by the craftsmen and contain all the dimensions and shapes of the parts concerned. In addition, it also includes the size and position of the process to ensure precision and detail in production. In addition, geometric tolerances, accuracy requirements, surface roughness, and other important information are annotated in the part drawing.

Can you add, I don't quite understand it.

In order to ensure the correct use of parts drawings, it is recommended that you should study the relevant **, symbols and standards with the relevant engineers. In addition, care should be taken to maintain accuracy during the production process to avoid product quality problems, and to fully consider the impact of surface roughness on the quality of the final product. Finally, the part drawing should be checked regularly to ensure that the component dimensions and positions are correct.