Division standard of finishing process and work step

Today, Wuxi kaihan Technology Co., Ltd. will give you a detailed introduction to the division standards of finishing processes and steps:

In finishing, the difference between process and work step is quite clear, and it is fine to each link. Generally, the processing industry distinguishes its mission according to the process or work step. Each person takes part, or a team takes part. Clear division of labor and clear mission.

The difference between finishing operations is based on the processed parts and the planned processing technology. In the processing of fine parts on CNC machine tools, the processes can be relatively concentrated, and most or all processes can be completed in one clamping as far as possible. First of all, consider whether the processing of the whole part can be completed on one NC machine tool according to the part drawing. If not, decide which part of the part to be processed on the NC machine tool and which part to be processed on other machine tools, that is, distinguish the processing procedures of the part. The difference between process and work step shall be summarized and considered according to the structural characteristics, technical requirements and other conditions of detailed parts.

General process differentiation method:

The difference between work steps is mainly considered in terms of processing accuracy and power. In a fine part processing procedure, it is often necessary to select different tools and cutting parameters to process different surfaces.

Principle of process differentiation:

1. The same surface shall be finished by rough machining, semi finish machining and finish machining in turn, or all machined surfaces shall be separated by rough machining and finish machining.

2. For parts with both milling surface and boring, milling surface can be performed first and then boring. The accuracy of holes can be improved by distinguishing work steps in this way. The workpiece is easy to deform due to the large cutting force during milling.

3. Differentiate work steps according to the tool. The turning time of the worktable of the fine parts processing machine tool is shorter than the tool change time. The work steps can be distinguished according to the tool to reduce the tool change times and improve the processing power.

The finish machining technology covers a wide range of areas, so it is only analyzed from the two aspects of machining possibility and convenience.

(1) The standard marking method on the part drawing shall adapt to the characteristics of numerical control processing. On the fine part processing drawing, the standard shall be quoted with the same datum or the coordinate standard shall be directly given.

1. This marking method is not only convenient for programming, but also convenient for the mutual harmony between standards. It brings great convenience in maintaining the consistency of planning datum, process datum, detection datum and programming origin setting.

2. Because parts planners generally consider installation and other application characteristics in standard marking, they have to choose some lax marking methods, which will bring much inconvenience to process organization and NC machining.

3. Because the precision of fine parts processing and repeated positioning is very high, and the application characteristics will not be damaged due to large accumulation errors, the loose marking method of some parts can be changed to the marking method of the same datum reference standard or directly giving the coordinate standard.

(2) The base point or node coordinates shall be calculated in the process of technical programming. In active programming, fine part machining should define all geometric elements that constitute part induction. Therefore, when analyzing part drawings, it is necessary to analyze whether the given conditions of geometric elements are sufficient. For example, arc and straight line, arc and arc are tangent on the drawing, but according to the standards given on the drawing, when calculating the tangent conditions, they become intersected or separated.

That's what Wuxi Bill Technology Co., Ltd. introduced to us.