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As the saying goes, people should learn to be lazy. Today, I’m going to tell you how to learn these skills when working with CNC. It’s much easier for us to learn these skills. Moreover, we can greatly improve the quality of our products. The following editor will tell you what skills CNC machining has when programming?

1. Computer simulation system for CNC machining application

With the development of computer technology and the expansion of NC machining teaching from time to time, there are more and more NC machining simulation systems, and their functions are becoming more and more perfect. Therefore, it can be used in the preliminary inspection procedure to observe the movement of the tool to determine whether there is a possibility of collision.

1. Locking function of CNC parts machining center

The common CNC machining center has locking function (full lock or single axis lock). When the program is input, the z-axis is locked and the collision can be judged by the coordinate value of z-axis. The application of this function should avoid the operation of tool change, otherwise the program can not pass through.

1. Improve programming skills

It is very important to be able to prevent some programming skills from collision in NC programming.

1. Application of the imitation function of CNC parts machining center

Common and more advanced CNC parts processing center has graphic display function. After inputting the program, it can call the graphic imitation display function to observe the movement track of the tool carefully, so as to check whether the tool may collide with the workpiece or fixture.

1. The coordinate system and cutter compensation must be set correctly

When starting CNC machining center, it is necessary to set reference point of CNC machining center. The working coordinate system of CNC machining center should be different from that of programming, especially in the direction of Z axis. If there is a mistake, the possibility of collision between milling cutter and workpiece is very large. In addition, the setting of tool length compensation must be correct, otherwise, it is either empty machining or collision.

1. The application of CNC parts machining center in idle running

The correctness of tool path can be checked by using the function of idle running of CNC parts machining center. When the program is input into CNC parts machining center, the tool or workpiece can be installed, and then the idle operation button is pressed. At this time, the spindle does not rotate, and the workbench runs automatically according to the program path. At this time, it can be found whether the tool may collide with the workpiece or fixture. However, in this case, it is necessary to ensure that when the workpiece is installed, the cutter cannot be installed; when the cutter is installed, the workpiece cannot be loaded, otherwise there will be collision.

In general, when the fault occurs, the alarm indicator light on the speed unit in the numerical control is abnormal, the fuse is blown out, and all kinds of jump switch for protection are given an alarm. After the failure, our work can not continue, which greatly delays our work efficiency. In fact, a lot of times, we can solve the problems by ourselves, but many people do not know what method can be used to deal with the sudden fault of CNC parts processing system. Today, the editor will teach you a few simple methods.

1. The protection switch of CNC parts processing system starts alarm. The protection switch is a device to protect the machine tool. For example, high voltage will burn some components and other emergency measures that cannot be controlled by the machine tool. When meeting these conditions, the protection switch will start to avoid unnecessary component damage, similar to safe stop and so on.
2. If the voltage is too low, the machine tool will give an alarm. The probability of this kind of occurrence in the machining center is very rare. This may be caused by the input voltage being lower than 85% of the rated value, or due to poor power connection.
3. The alarm is caused by the broken feedback line of the detection speed, which is an error alarm, because there is no problem in the airport, and there is a problem in the detection and feedback system. Most of the alarms are caused by the broken speed feedback line of the CNC servo motor of the machining center or the poor contact of the detection feedback line.
4. Overload alarm, the cause of overload alarm is that the CNC mechanical load of the machining center is abnormal, or the upper limit value of motor current on the speed control unit is set too low. The permanent magnet falling off on the permanent magnet motor will also cause overload alarm. If the CNC motor without brake in the machining center can’t rotate by hand or it is very hard to rotate the shaft when it is no-load, it means that the permanent magnet has fallen off completely.
5. The fuse on the CNC speed control unit of machining center is blown or the circuit breaker trips.
6. In general, there are two possibilities of high current alarm, that is, high current alarm caused by damage and short circuit of power drive element on CNC speed control unit of machining center.
7. High voltage will also cause alarm of machine tool. Generally, there are three possible situations of high voltage alarm, which may be that the input voltage of CNC of machining center exceeds 10% of rated value, or insulation performance of servo motor decreases, or high voltage caused by circuit of speed control unit of machining center.

The quality of repair work depends on the personnel condition. It is necessary for repair workers to have the following basic conditions: a high sense of responsibility and outstanding professional ethics; a wide range of knowledge, grasp the basic knowledge of computer skills, analog and digital circuits, automatic control and motor drive, inspection skills and mechanical processing technology and a certain level of foreign language; through outstanding skills training, master the work of CNC, drive and PLC Professional principle, understand CNC programming and programming language; understand the structure, have experimental skills and strong ability to operate; grasp a variety of commonly used (especially on-site) testing instruments, appearance and various maintenance tools.

2、 The conditions of CNC machining center maintenance methods

Prepare common spare parts and accessories; get practical assistance or supply of micro electronic components at any time; repair necessary things, instruments, appearance, wiring and microcomputer. The best way is to have a small programming system or programmer to assist equipment debugging; complete materials, manuals, circuit diagrams, repair instructions (including CNC operation instructions), interface, adjustment and diagnosis, driver instructions, PLC instructions (including PLC user program list), component forms, etc

“CNC parts processing” sequence

In our CNC machining parts, there are often several surfaces that need to be processed. Machining on the surface not only has certain accuracy requirements, but also is very important for the position requirements. In addition, the sequence of processing can not be disordered.

1. In order to ensure the important surface finish of CNC parts, it is necessary to finish the surface of important parts.
2. After finishing datum machining, roughing, semi finishing and finishing should be carried out on the main surfaces with high precision requirements. The surface with high precision needs to be finished.
3. The surface as a precision reference should be machined at the beginning of the CNC part processing process, because it is used to locate other surfaces in subsequent processes. That is, “benchmark first, then others”.
4. It is necessary to use coarse datum to locate the precise datum plane of CNC parts. In single piece production, small batch production and even batch production, for castings and forgings with complex shape or large size, as well as blanks with large size error, the marking process should be arranged before the machining process, so as to provide alignment reference for precision reference processing.
5. For the process prone to waste products, finishing and finishing can be appropriately placed in front, and some minor surface processing can be placed behind.

CNC machining, CNC machining refers to the processing with CNC machining tools. So what is the composition and characteristics of machine tools for processing?

CNC index controlled machine tool is programmed by NC machining language, usually G code. NC machining G code language tells CNC machine tool which Cartesian position coordinates, and controls the tool feed speed and spindle speed, as well as tool converter, coolant and other functions. Compared with manual machining, CNC machining has great advantages, such as the parts produced by CNC machining are very accurate and repeatable; CNC machining can produce parts with complex shapes that cannot be completed by manual processing. CNC machining technology has been widely promoted, most of the machining workshops have the ability of NC machining. The most common NC machining methods in typical machining workshops are CNC milling, CNC lathe and CNC EDM wire cutting (WEDM). The tool for NC milling is called CNC milling machine or CNC machining center. CNC turning lathe is called CNC lathe center. NC machining G code can be manually programmed, but usually the machining workshop uses CAM software to automatically read CAD file and generate G code program to control NC machine tool.

All kinds of machine tools are usually composed of the following basic parts: supporting parts, which are used to install and support other parts and workpieces to bear their weight and cutting force, such as bed and column; speed changing mechanism, which is used to change the speed of main motion; feed mechanism, which is used to change feed rate; headstock for installing machine tool spindle; tool holder, tool magazine; control and control system; lubrication system; cooling System. The accessory devices of machine tool include loading and unloading device, manipulator, industrial robot and other machine tool accessories, as well as chuck, suction cup spring chuck, vise, rotary table and dividing head and other machine tool accessories.

CNC machine tools have the following characteristics:

1、 High machining precision and stable machining quality;

2、 The complex shape of the parts can be processed by linkage;

3、 When the machining parts are changed, only the NC program needs to be changed, which can save the production preparation time;

4、 The machine tool itself has high precision and rigidity. It can choose favorable processing amount and high productivity (generally 3 ~ 5 times of ordinary machine tool);

5、 High degree of automation of machine tools can reduce labor intensity;

6、 Mass production, product quality is easy to control;

7、 The requirements for the quality of operators are low, and the technical requirements for maintenance personnel are high.

CNC machining refers to the processing with CNC machining tools. CNC index controlled machine tool is programmed by NC machining language, usually G code. NC machining G code language tells CNC machine tool which Cartesian position coordinates, and controls the tool feed speed and spindle speed, as well as tool converter, coolant and other functions. In CNC machining, the determination of processing route should follow the following principles.

1、 The accuracy and surface roughness of the workpiece to be processed shall be guaranteed.

2、 It can shorten the processing route, reduce the idle travel time and improve the processing efficiency.

3、 Simplify the workload of numerical calculation and simplify the processing program.

4、 For some reusable programs, subroutines should be used.

CNC is also called computer gong, cncch or CNC machine tool. In fact, it was introduced into the Pearl River Delta of mainland China. It is actually a CNC milling machine. In Guangzhou, Jiangsu, Zhejiang and Shanghai, a new type of machining technology is called CNC machining center. Its main work is to compile processing programs, that is, to convert the original manual work into computer programming. Of course, manual processing experience is required. So, what are the advantages of CNC processing?

1、 A large number of tooling is reduced, and complex tooling is not needed to process parts with complex shapes. If you want to change the shape and size of parts, you only need to modify the part processing program, which is suitable for the development and modification of new products.

2、 The machining quality is stable, the machining precision is high, and the repetition precision is high, which can meet the processing requirements of aircraft.

3、 In the case of multi variety and small batch production, the production efficiency is higher, the time of production preparation, machine tool adjustment and process inspection can be reduced, and the cutting time is reduced due to the use of the best cutting amount.

4、 It can machine complex surface which is difficult to process by conventional method, and even can process some parts which cannot be observed.