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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Hydrostatic guideway of CNC machining lathe

The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state.   CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200   beryllium   copper   and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette

Introduction of KOVAR parts

KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR  machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stress,

How Many Steps Did You Take to Become a CNC Programmer?

Keywords:CNC,CNC milling, CNC turning,Cnc Machining  

How many steps did you take to become a CNC programmer?

Step 1: Must be a good craftsman.

Cnc Machine tools set drilling, milling, boring, reaming, tapping and other processes in one. The technical quality of the craft personnel is very high. Numerical control program is a computer language to reflect the process of processing technology. Craft is the foundation of programming. You can’t program if you don’t know the craft.


In fact, when we chose the mechanical cutting processing this career, it means that the early industry is hard, dry coarse. A little basic knowledge learned in college is a pittance against the needs of a factory. A machining engineer is, in a way, an experienced engineer. Therefore, a lot of time must be spent with workers, dry lathes, milling machines, grinding machines, machining centers, etc.;


Then in the office to make technology, estimate material consumption, calculate quota. You must be familiar with the performance of various machine tools and the skill level of the workshop master. So after 2-3 years of training, you can basically become a qualified craft personnel. From my personal experience, I suggest that young college students who have just started to work, must be modest to learn from the workers, once they can impart decades of experience with you, you can walk a lot of detources.


Because these experiences cannot be learned from books, the choice of process is the comprehensive consideration of equipment capacity and personnel technical ability of the choice. It is impossible to be a good technologist without the support and trust of employees. Through this long period of learning and accumulation, you should achieve the following technical standards and requirements:

1, familiar with drilling, milling, boring, grinding, planer structure, process characteristics,

2,Familiar with the properties of processing materials.

3, a solid tool theory of basic knowledge, grasp the tool of the conventional cutting parameters.

4, familiar with the enterprise’s process specifications, standards and various processes can meet the general requirements, conventional parts of the process route. Reasonable material consumption and time quota, etc.

5, collect a certain amount of tools, machine tools, mechanical standard data. Especially familiar with the tool system used in nc machine tools.

6,Familiar with the selection and maintenance of coolant.

7,Have a common sense understanding of related jobs. For example: casting, electromachining, heat treatment and so on.

8, have a good fixture foundation.

9,Understand the assembly requirements and use requirements of the processed parts.

10,Have a good basis of measurement technology.


Step 2: Master numerical control programming and computer software applications.

This one I think relatively easy, programming instructions are also a few dozen, various systems are similar. It usually takes 1-2 months to get very familiar with it. Automatic programming software is slightly more complex, need to learn modeling. But for the cad foundation of good people, it is not difficult, In addition, if it is a manual programming, analytic geometry foundation is also good! Readers are most adapted to the study of such knowledge. In practice, the criteria for a good program are:


1,It's easyto understand, organized, everyone can understand the operator.


2,The less instructions in a program, the better, for the purpose of simplicity, utility and reliability. From the perspective of programming to the understanding of the instruction, I think the instruction is ALSO G00 and G01, the other are auxiliary instructions, is convenient programming to set.


3, It's easy to adjust. It is better not to change the program when the machining accuracy of parts needs to be fine-tuned. For example, the tool wear, to adjust, as long as the tool offset table length, radius can be changed.


4, It's asy to operate. The program should be compiled according to the operating characteristics of the machine tool, which is conducive to observation, inspection, measurement, safety, etc. For example, the same part, the same processing content, in the vertical machining center and horizontal machining center respectively, the program is certainly not the same. In machining, the simplest method is the best method. As long as the practical experience of the peer, presumably will agree with this sentence!


Step 3: Skilled operation of CNC machine tools.

It is needs 1-2 years of study, the operation is exquisite feel, beginners, especially college students, in the heart understand how to do, but the hand is not obey. To learn in this process: the installation of the system operation mode, clamp, parts of benchmark alignment, the knife, set the zero offset, set the radius of tool length compensation, compensation, and the cutting tool and the handle of the loading and unloading, tool grinding, parts of measuring, able to skillfully use vernier caliper, micrometer, dial indicator, dial gauge, diameter of lever table) and etc. The most can reflect the level of operation is: horizontal machining center and large gantry (moving beam, top beam) machining center.


Step4: must have a good fixture foundation and measurement technology level.

Here I put the fixture and measurement technology is a single list because: it plays an important role in the quality of parts processing and the accuracy of the machine tool, is one of the signs reflecting the level of the technical personnel. The whole process system: Machine is machine tool factory guarantee the accuracy, cutting tools and cutting parameters are cutting tools provide general issues is not large, only the jig is technology personnel specifically designed for specific parts, mostly on numerical control machine tool parts are all has the certain difficulty, so often difficult to anticipate problems, I’m engaged in CNC machine tool cutting debug user parts a decade, Don’t change the fixture is really not encountered.


During debugging, the first part processing is not qualified, more than half of the reason is due to the fixture positioning, clamping pressure point, clamping force is unreasonable. Fixture reason analysis difficulty lies in only qualitative, difficult to quantify. If there is no experience in fixture design and parts clamping, it will be difficult. In this aspect of learning, it is suggested to do precision coordinate boring machine senior technicians to consult. Accurate measurement of the level of one of the basic skills engaged in machining, to be skilled in the use of vernier calipers, kilocards, dial gauges, dial gauges, inside diameter lever gauges, calipers, etc. Sometimes parts processing, CMM is not counted on. It must be measured by hand. Just think, parts are not accurate, which leader and worker master will trust you?



Step 5: Get familiar with CNC machine tools. Proficient in nc machine tool maintenance.

The so-called familiar with CNC machine tools that should do:

1,Familiar with nc electrical components and control principle. Can tell the name and function of each component in the electrical box, can understand the electrical schematic diagram. According to the electrical alarm number, the alarm content can be found.


2,Understand the structure and transmission principle of ball screw. It is clear which factors affect the accuracy of machine tools.


3,Understand the structure of the bearings at both ends of the machine tool screw and its influence on the accuracy of the machine tool.


4, understand the lubrication system of machine tool (bearing, spindle, each pair of motion, gear box, etc.), clear the distribution of each lubrication point. The grade of lubricating oil for machine tools and the normal consumption of weekly or monthly oil.


5,Understand the cooling system of machine tools: cutting (water, gas) cooling, spindle cooling, electric box cooling, etc


6,Understand the main transmission structure of the machine tool, and the specific data characteristics between the speed and torque of each machine tool.


7, Understand the characteristics of the machine tool guide rail pair: is it line rail or slide rail, how rigid (bearing capacity)?


8, It is can eliminate common operation faults (such as: extreme, knife library knife number error, etc.)


9,Proficient in the accuracy (static and dynamic) indicators and detection methods of machine tools.


10,Familiar with the mechanism of knife store and the principle of tool change.


Above a few without more than 3 years of time to exercise, I am afraid it is difficult to meet the requirements. And many enterprises do not have the conditions to learn. It is recommended to consult the master of the equipment maintenance department.


I will not say much about the details of the maintenance of machine tools, each enterprise has their own experience and standards.


Machine tool maintenance focus on “maintenance”, usually should pay attention to (should do a good long-term record) :

1,It is very important to pay attention to whether the starting load of each axis of the machine tool is normal every day. If the starting load is abnormal, it means that the resistance of the motion pair or the transmission pair has changed. Otherwise, a long time, great damage to the machine tool;


2,Pay attention to the normal consumption of lubricating oil. Too much, too little, must be checked.


3,Frequently clean the air conditioning screen of the electric box and the air vent screen. Once the integrated circuit board of the internal power module and the drive module of the electrical box sticks to the dust containing iron powder, the machine tool will appear inexplicable alarm, and it can not be repaired. Just wait for the board to change!


Step 6: Develop good habits to adapt to the characteristics of NC machining.

Suitable for numerical control processing of the master should be modest, rigorous, calm, careful thinking, organized and independent people.

  1. The processing of some large parts, not only the processing content is much, but also the transformation of three-dimensional coordinates in space. The calculation of machining trajectory is very complex and difficult to determine. If the problem is not considered in detail and comprehensively, the calculation is not accurate, and the program modification becomes more and more chaotic during debugging, and the probability of error is large. The phrase “look before you leap” is most apt here.


        2.The parts debugging process is a multi-person cooperation process, including operators, inspectors, fixture design, fixture assembly personnel, etc. When there is a problem, ask for their opinion, do more experiments, do not jump to conclusions. Do not blame too much on employees who make mistakes, but have a “compassionate” attitude.


         3. The work of CNC machine tool is controlled by instructions. When debugging, before the “start” button is pressed, you must be very clear about the running track of the machine tool. To be rigorous, meticulous, do not let the machine first move again. If the program is wrong or the compensation parameters are incorrect, or the wrong coordinate system is selected. Light scrap parts, heavy safety accidents. Temper is rough, do not have a clue, and repeated teaching is not adapted to the operation of CNC machine tools.

I tell you a fact: the original our company more than a dozen user debugging cutting technicians, are well-informed, experienced to the generation, can not which one, which year does not break the tool.


         4.Debugging processing problems, to calm, do not panic, and then misoperation. Good psychological quality.


         5.Whentheparts fail to pass the test for many times, the analysis should be organized and the responsibility should be based on it. Some relevant departments for various reasons, will give a variety of explanations, then you have to be independent, remember: do a wrong thing does not matter, but not the wrong way to do it.


        6.A technologist, due to the environment, the technical ability is always limited. With the rapid development of technology, there is always room for improvement. When the technology inside the factory has been digested, the vision should be put outside, closely follow the advanced processing technology at home and abroad, learning, digestion. Advise your boss on technology.

Above is my mind the ideal NUMERICAL control programming master, in fact, in the final analysis, there should be senior technologist, senior technician level programmer.


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