Process analysis is the preparatory work for CNC plus 12 for the processed parts. The CNC plus TT process of CNC machine tools involves a wide range and many influencing factors. Therefore, when analyzing the processing technology of the processed parts, the characteristics of CNC machine tools plus T should be fully considered, and the possibility and convenience of CNC plus T should be considered. The process analysis is carried out carefully and carefully.
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The Principles Of CNC Machining Process
1.First Rough And Then Fine
In order to improve production efficiency and ensure the quality of parts finishing, the rough machining process should be arranged first, and a large amount of rough machining allowance before finishing should be processed in a short period of time, and at the same time, the requirements of uniformity of finishing allowance should be met as much as possible.When the rough machining process is completed, if the uniformity of the remaining allowance cannot meet the finishing requirements, semi-finishing can be arranged as a transitional process, so that the finishing allowance is small and uniform to meet the finishing allowance require.
2.Close First, Then Far
The distance mentioned here refers to the cnc machining position relative to the starting point of the knife. In general, especially in rough machining, it is usually arranged that the part close to the starting point is processed first, and the part far away from the starting point is processed later, so as to shorten the moving distance of the tool and reduce the idle time, which is also beneficial to the blank or The rigidity of the semi-finished product improves its cutting conditions.
3.Inside First, Then Outside
For parts that need to process both the inner surface (inner shape and inner cavity) and the outer surface, it is usually arranged to process the inner surface first and then the outer surface. This is because it is difficult to control the size and shape of the inner surface, the rigidity of the tool is poor, the heat in the inner cavity of the part is not easy to spread, the durability of the cutting edge of the tool is easily affected by the cutting heat, and it is difficult to remove chips during cnc machining.
4.The Cutting Path Is The Shortest
On the premise of ensuring the cnc machining quality, choosing the shortest tool path as much as possible can not only save the execution time of the entire cnc machining process, but also reduce some unnecessary tool consumption and wear of the sliding parts of the machine tool feed mechanism.
NC Program Format
A part processing program is composed of a program name and several program segments, and each program segment is composed of a program segment number and several instructions, and each instruction is composed of letters, symbols, and numbers. Each segment of the program is composed of a semicolon (;) as the end symbol , The program segment is the basic unit of the NC program. For example:
- program name 08008;
- N0010 G54 G98;
- M03 S1000;
- N0030 T0100;
- N0080 G00 X40 Z10;
- N0050 G01 X0 Z10;
- Block number Command
illustrate:
- Different CNC systems have different rules for program names, and the random manual shall prevail;
- The program segment starts with the sequence number “Nxxxx” and ends with a semicolon (;), and a program segment represents a complete processing action;
- The serial number is optional, the interval between the two serial numbers can be any number, there is no sorting requirement, and the order can be chaotic.
Dimensioning Method Of CNC Machine Tool Analysis Part Drawing
When the workpiece is processed by numerical control method, the dimensioning method on the process drawing should be adapted to the characteristics of numerical control plus T.
Usually, designers take into account the factors of assembly and use characteristics when dimensioning, and often use locally scattered dimensioning methods. For example, the dimensioning of the hole system of the box parts is based on the hole spacing as the main dimension to reduce the accumulated error and meet the performance and assembly requirements.
In CNC machining, the labeling method of CNC machine tools brings a lot of inconvenience to process arrangement and CNC programming. Therefore, the locally scattered labeling method should be changed to the same datum labeling method. The same datum annotation method of CNC machine tools uses the same datum to quote the size or directly give the coordinate size.
It is suitable for the characteristics of CNC machining, which is convenient for programming and maintains the consistency of design, technology, measurement datum and programming origin settings. Moreover, due to the high precision of CNC machining and repeated positioning, the use of the same reference marking method will not destroy the use characteristics of the parts due to large cumulative errors.
The CNC Machine Tool Analyzes The Geometric Elements That Constitute The Contour Of The Part
The shape, position and size of the geometric elements that constitute the contour of the part (such as the position of the line, the radius of the arc, whether the arc and the line are tangent or intersecting, etc.) are an important basis for NC programming. During manual programming, the coordinates of each node need to be calculated according to them; during automatic programming, all geometric elements constituting the outline need to be defined according to them. If a condition is not clear, programming will not work. Therefore, the part drawings should be carefully and carefully analyzed, and if problems such as unclear conditions are found, they should be resolved through consultation with the designer in time.
Technical Requirements For CNC Machine Tools To Analyze Parts
The technical requirements of parts mainly refer to dimensional accuracy, shape accuracy, position accuracy, surface roughness and heat treatment process.
On the premise of ensuring the performance of the parts, the technical requirements of the parts should be economical and reasonable. Excessive precision and surface roughness requirements will make the process complicated, difficult to process and increase the cost.
CNC Machine Tools Analyze The Structural Manufacturability Of Parts
The structural manufacturability of parts refers to the feasibility and economy of the designed parts to be manufactured under the premise of meeting the requirements of use.
Good structural manufacturability can make parts easy to process, save man-hours and materials; while poor structure 1=manufacturability will not only waste man-hours and materials, but also make parts processing difficult, and even make parts impossible to process. Therefore, the structural manufacturability of each part of the parts should conform to the characteristics of CNC machining.
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