Machinery industry – Page 33 – CNC Machining & Turning, Milling, Metal parts

CNC machining knowledge

Create CNC process function and CNC process plan:

(1) CNC process considers the process of machining parts, clamping and positioning of machining parts, tool selection, simplified process route, cutting method and process parameters in conventional process.

(2) CNC machining process design is mainly used to guide CNC programming. Our company combines the responsibilities of CNC technicians and programmers, and the programmers are responsible for the whole CNC machining process of the mold, which improves the working efficiency.

(3) CNC machining has a high degree of automation and many influencing factors. Quality and safety are very important in CNC machining and must be guaranteed.

(4) The preparation of CNC machining process should be strict with the rationality of strip steel. The CNC process is complex and has many influencing factors. It is necessary to think deeply about the whole process of CNC processing and have good strip rationality in order to program the CNC process well. Due to the high degree of automation and poor adaptability of CNC processing, when there are problems, it is difficult for the staff to correct them on site, and the manufacturing and processing defects of the light-duty people occur safety accidents on the way, so it is necessary to systematically design CNC process in advance.

(5) good inheritance of CNC technology. It has been proved to be a good CNC technology in production. It can make templates and save them as documents. It can be used to process similar parts in the future, saving time and ensuring quality.

For CNC machining process planning, it will be considered as the state space of a series of programs from the initial state (male and female die core blank) to the final state (part). CNC sequence sorting must conform to the following general rules:

1. The primary parameter is followed by the secondary parameter.

2. Face before hole, milling before drilling.

3. First coarse, then fine.

4. The inner cavity is processed first, and then the shape is processed.

5. According to the sequence of working procedure, the diameter of cutter varies from large to small.

6. The processing of the previous process will not affect the clamping and positioning of the next process.

7. Put the same tooling and fixture together to reduce repeated clips and positions.

8. CNC process must be centralized.

9. Do not use the program instruction to weaken the part stiffness first.

Good CNC process planning needs to consider the following aspects:

Whether it can meet the technical requirements of parts, whether it can improve the efficiency of CNC processing, low processing cost and good quality control.

Therefore, the overall CNC processing plan is generally as follows:

1. Selection of CNC machine tools.

2. Select the treatment method.

3. Determine how to clamp the part and select clamp.

4. Positioning method.

5. Inspection requirements and methods.

6. Select the tool.

7. Error control and tolerance control in machining.

8. Define CNC process.

9. CNC sequence.

10. Select cutting parameters.

11. Prepare NC machining program table.

Process of metal parts processing

We have hardware everywhere in our daily life, which can be said to be endless. So what is hardware? Most people don’t understand, I don’t know, I haven’t touched. Therefore, hardware, as the meaning of five kinds of metals shows, is made of gold, silver, iron, copper and aluminum as raw materials, through cutting, pressing, brazing and other physical processing, to produce all kinds of metal device parts we need.

Our common screws, nuts, etc. Do not look at the small screws so common, hardware processing into finished products seems easy. In fact, the process is quite tedious. One is to have drawings of screw samples, and then select processing equipment according to the tolerance and accuracy requirements of the drawings. After the semi-finished products are made by the equipment, the burr on the burr shall be removed by fine vibration grinding to make the surface smooth and glossy, so as to prevent the contact from hurting the user.

Finally, the surface plating process to prevent rusting is carried out according to the material requirements. Such a small screw was born, and every program should be taken seriously. In the fastener market, ordinary parts can not meet the requirements of high-end consumers, but as long as there are models and drawings, we can process them by CNC or ordinary lathe to make the parts we want. Parts are an indispensable part in our life, and play an important role in all places.

It can be said that with the transformation and upgrading of industrial modernization and the growth and development of social economy, the fastener industry of hardware processing will play an important role

Continuous improvement of Chinese hardware Customization Technology

With the continuous improvement of domestic hardware customization technology, the dimensional tolerance and performance parameters of products are further improved. Due to the cost advantage of hardware customization products, precision hardware customization parts gradually replace forged parts.

At present, precision hardware components are mainly used in mechanical equipment, parts and components, electrical toys, electronic products, etc. the manufacturing process of customized precision hardware products is about 30% less than that of traditional metal forging process, and the utilization rate of materials is up to more than 80%. The manufacturing process conforms to the concept of environmental pollution, environmental protection, energy conservation and emission reduction, and sustainable development. In the future, domestic enterprises will use more CNC processing hardware customized process to produce more product parts, while improving the quality and cost management requirements of energy conservation and emission reduction policies.

In the background of Chinese market, domestic hardware accessories customization enterprises are trying to improve their technology and technology, so that they can cover the needs of all walks of life for hardware accessories customization. To provide customers with a variety of high-precision and complex mechanical parts hardware products, customized overall solutions and services, to multiply the productivity effect!

We must have rich experience in project practice to produce precision hardware accessories customized accessories processing products. The processing and customization of special-shaped frame put forward higher requirements for function and precision, and the existing processing of ordinary machine tools can not meet the requirements of new materials and new structures.

The structure of special shape becomes more and more complex. Compared with the traditional process, the cost of individual products increases directly. The technical difficulty and cost complement each other. By determining the alloy elements of special shape structure components and hardware tools, and improving some technical treatment, we can meet the requirements of different precision and hardness performance of precision parts. In addition, we can increase the same profile structure It does not increase the cost. Precision hardware customization including sheet metal pressure nut, furniture hardware hinge, small motor carbon brush copper sleeve, mining machinery Stone copper sleeve, motor oil shaft, coffee oil bearing, etc. technical innovation can meet the high quality requirements, which plays an important role in energy saving, performance improvement and productivity improvement.

Selection of CNC milling machine

1、 To buy a machine, you still need to choose a brand. Although the brand is more expensive, it’s worth the money. I believe the assembly gap will not exceed 50000 yuan, but it’s still cost-effective in a comprehensive way. A good machine can create value for you virtually. If you buy a bad machine for three days or two ends fail, or the accuracy cannot be reached, you’re exhausted. In the end, all the customers are gone.

2、 Choose a regular manufacturer and register with the industrial and commercial department. It’s better to have quality certification. Those small factories without factory agents or with only a few people should not be tested. They can’t figure out how to be cheap for a while. When no one can be found, they will have to cry a lot in China.

3、 Look at the service attitude. No matter how good the machine is, there will be colds. At this time, you need to choose a good service provider. Those who don’t trust us and don’t repair them in time should not be ignored. When choosing machines, sometimes I prefer to choose the ones with slightly poor quality, but the ones with timely service make people feel relieved.

4、 Choose the domestic assembly machine, if it is a brand machine, then rest assured. For the sake of their long-term efforts to establish credit, merchants do not need to quote random prices, and the machine will not cut corners. For example, Yongjin, Chaoqun, Zhongmao (now called Shenghong), Liwei, Dali, you can buy with ease. If other brands want to see if the controller is Mitsubishi m64sm, don’t spend the price of m64sm to buy a m64as controller (to prevent businesses from selling mutton and dog meat). Although they are all 64 series, the price difference is more than 10000, and the performance gap is even less high-speed and high-precision, which is an important function. Although some businesses agree to reduce the price, they buy different things. Therefore, we need to eliminate the cost The fee maker thought that he had taken advantage of it. In fact, the merchant was stealing it

Classification of CNC machining cente

Large CNC machining centers are usually classified into horizontal, vertical and multi axis machining centers according to the relative position of the spindle and the worktable.

A horizontal machining center: refers to the machining center with the spindle axis parallel to the workbench, which is mainly suitable for machining box type parts.

B vertical machining center: it refers to the machining center set vertically between the spindle axis and the workbench, which is mainly used for machining complex parts such as plates, plates, molds and small shells.

C multi axis linkage machining center, also known as universal machining center: it refers to the machining center that can control linkage change through the angle between the machining spindle axis and the rotary axis of the worktable to complete complex space surface machining. It is applicable to the machining of impeller rotor, mould, cutting tool and other workpieces with complex space curved surface.

Construction of CNC machine

1. Casting, which is the most important part of CNC machine, directly affects the accuracy, stability, wear resistance and service life of computer gongs. After the casting is finished, it is not immediately used in production. A good casting is after wind and rain, sun exposure, natural weathering, some of which are soaked by sea water. After the casting does not change, it will be processed. The machine tool is not easy to change. CNC machining can maintain the stability and accuracy of the machine tool for a long time.

2. CNC machine machining spindle, the spindle is used to directly face the workpiece, it is driven by the motor to work, high-speed rotation, on the spindle with a tool handle, it can chip the workpiece, to meet various production needs, the quality of the spindle will directly affect the processing accuracy, if there is wear of the internal bearing, it is easy to cause the spindle swing processing out of the thing accuracy naturally Deviate several wires. At present, the rotating speed of the main shaft is generally around 8000 revolutions, and the high-speed machine can achieve more than 20000 revolutions. In the traditional machining center, each machine has only one main shaft. In recent years, there have been two or more main shaft machining centers.

3. The screw rod is also a part of the fuselage. It is driven by the servo motor. The displacement of the working table is driven by the copper sleeve of the screw rod to meet the processing needs. If there is a gap between the screw rods, it is also directly reflected in the processing accuracy and smoothness.

4. Dongguan machine parts processing motor, there are two kinds of motors: servo motor and frequency conversion motor. The stability of servo motor is good, the power of spindle drive motor is large, and the cooperation rate of three-axis drive motor is small.

5. The coupling is installed between the screw rod and the motor, which is only a linkage.

6. The lubricating cold system is composed of automatic oil pump, spindle oil cooler and chip liquid circulation system. The oil is fed automatically without manual operation. When the machine tool is working, the oil is pumped once every few minutes, and the oil pipe is connected to every corner, such as screw rod, guide rail, etc. if the oil path is blocked, it is easy to cause the guide rail wear and affect the accuracy. Dongguan machine parts processing spindle oil cooling is to cool the spindle and add a cycle of cold power system, 8000 rotation of the spindle can not be, 8000 rotation of the spindle must be equipped with more than. The chip liquid circulation system uses the pumping motor to pump up the oil from the oil tank and rush it to the workpiece being processed.

7. When machining sheet metal, the requirements for sheet metal are not too high, as long as there is no oil leakage, but it also involves the problems of beautiful appearance and image

Safety knowledge in CNC operation

1. Effective protective measures shall be taken for the equipment prone to injury accidents in the processing area.

2. The protective measures shall ensure that any part of the operator’s body is prevented from entering the dangerous area under the working condition of the equipment, or that the equipment cannot operate (run) or make emergency braking when entering the dangerous area.

3. The following protective measures shall be taken for machining equipment separately or simultaneously:

(1) Completely fixed and semi fixed airtight cover;

(2) Mechanical or electrical barriers;

(3) Mechanical or electrical interlocks;

(4) Automatic or semi-automatic feeding and discharging device;

(5) Hand limiter, hand release device;

(6) Mechanical or electrical hands off device;

(7) Automatic or manual emergency stop device;

(8) Limiting devices that cause dangerous travel, feeding, or feeding;

(9) Prevent misoperation or misoperation of the device;

(10) Warning or alarm device;

(11) Other protective measures.

Composition of automatic tool change device for large CNC machining

The large CNC machining center is developed from the basic CNC milling machine. It integrates all the features and functions of the CNC milling machine. The only difference between the CNC milling machine and the large CNC machining center is that the machining center has an automatic tool change device, which can realize the automatic tool change function during machining. The CNC milling machine has no automatic tool change device, which can not realize the automatic tool change function, which is the only difference between CNC milling machine and machining center.

Today, Xiaobian will introduce the automatic tool change device. Automatic tool change device of machining center: the automatic tool change device of machining center is composed of parts such as tool magazine, mechanical arm and driving mechanism. The tool magazine is used to store the tools needed for machining. There are many types of magazine, mainly according to the shape, there are many kinds of magazine, such as hat magazine, disc magazine and chain magazine. The capacity of these magazine is several to hundreds of knives. In the market, there are two kinds of tool magazine commonly used in machining centers, i.e. hat magazine and disc magazine, while chain magazine is not used by many manufacturers because of its high price.

Here is a brief introduction to the tool change method. The tool change method of large-scale CNC tool magazine is relatively simple. There is no mechanical arm in this kind of tool magazine, so it is not necessary to use the mechanical arm to complete the tool change. The tool change mode of the tool magazine is as follows: the tool magazine moves to the spindle to realize the tool change. This type has the advantages of high cost performance, convenient maintenance, simple structure and so on, but the disadvantage is that the tool change speed is slow. Tool change mode of disc type magazine: the tool change mode of disc type magazine is relatively complex, which is mainly completed by the manipulator, which takes out the tool from the magazine 180 ° and rotates it into the spindle to complete the tool change. This kind of tool magazine has the advantages of fast tool change, its disadvantages are complex structure, inconvenient maintenance, and high failure rate. Although there are different ways of tool changing, tool selecting and tool structure in large-scale computer gong processing disk type tool magazine, they are all controlled by numerical control system, and the selection and exchange of tools are realized by motor, air pressure or hydraulic pressure and manipulator.

Analysis on the technical problems of CNC machining electrical board

The most common CNC processing Bakelite in China can be done by blowing air. Use tungsten steel knife or PCD knife. Do not use white steel knife to rotate too fast to 1-10 meters. Moreover, when processing, pay attention to chip removal or the chips will be piled on the workpiece, the large plate-shaped workpiece will be deformed due to unclean treatment, of course, the product will also be deformed after a period of time, mainly affected by the temperature and humidity.

Do not use coolant when processing electrical board with China CNC. If coolant is used in the processing, the chips cut by it are easier to block the water pump. If you want to have a better cooling effect and make sure that there is no smoke everywhere in the workshop, it is good to use air mist to cool, but remember not to use water. Add antirust cutting fluid to the water to protect the machine tool from rust. If you want to process products with high flatness, you must use vacuum sucker. Of course, poor quality bakelite, serious deformation. Poor color hair weight, odor when cutting, easy to layer not delicate.

Analysis on the technical problems of CNC processing electric board in China:

The most common way to process Bakelite is to blow. Tungsten steel knife or PCD knife are used. White steel knife is not allowed. Do not rotate too fast. Feed 1-10 meters, (mainly depends on the power of the spindle, the diameter of the cutter, and the cutting depth. Generally, 3-4 meters is suitable. ）In addition, when processing, pay attention to chip removal, otherwise the chip will pile on the workpiece, the large plate-shaped workpiece will be deformed, of course, the product will be deformed after a period of time, mainly affected by temperature and humidity.

When using CNC computer gong to process electrical board, do not use coolant. If coolant is used in the process, the chips cut by it will be broken and water pump will be blocked easily. If you want to have a better cooling effect and make sure that there is no smoke everywhere in the workshop, it is good to use air mist to cool, but remember not to use water. Add antirust cutting fluid to the water to protect the machine tool from rust.

If you want to process products with high flatness, you must use vacuum sucker. Of course, poor quality bakelite, serious deformation. Poor color and heavy hair, stink when cutting, easy to layer, not delicate. This requires that when purchasing, we must choose manufacturers with better quality to purchase electrical boards.

CNC machining center integrates into the mobile world

CNC machining center has been successfully integrated into the mobile world. In fact, people and intelligent terminals have been integrated, and each node is more accurate and efficient information interaction.

As we all know, in addition to work and sleep, we also have a lot of fragmented time every day. The existence of these fragmented time and the popularity of current smart phones make the mobile Internet industry hot. Fengge said that in the era of Internet development, CNC machining center will march into the mobile Internet, promote its own new products as an important channel for mobile Internet to publicize its own products, and effectively attract its own target customers through such a mode. Consumers will search information more actively according to their own initiative needs, so as to achieve the goal of enterprises and enterprises The interaction between consumers has achieved a new height of mobile marketing.

CNC machining center is one of the most productive and widely used CNC machine tools in the world. It has strong comprehensive processing ability, can complete more processing content after the workpiece is clamped once, and has high processing accuracy. For the batch workpiece with medium processing difficulty, its efficiency is 5-10 times of that of ordinary equipment, especially it can complete the processing that many ordinary equipment cannot complete. It is more suitable for the single piece processing with complex shape and high precision requirements or the production of multiple varieties with small and medium batches. Feng Ge, an expert in the industry, knows a lot about CNC professional knowledge, keeps up with the trend of the times and the current Internet industry. She believes that an enterprise must keep up with the trend of the times, conform to the development of the times and catch up with the pace of the times. With the rise of China’s e-commerce and the rapid development of the industry, CNC processing centers must take advantage of the trend to transform in order to play the number Control the advantages of machining center.

A new round of enterprise marketing revolution has been triggered. Mobile marketing has become a new highlight of CNC machining center industry. Online marketing has expanded the current market, increased new users, and increased the integrity of products. This way will also give full play to the advantages of products. The irreplaceable advantages of CNC machining center in market capacity, market price and other aspects will be in this marketing mode Next, keep showing. How can enterprises adapt to the new changes? According to industry expert Feng Ge, the realization of online and offline marketing mode is the key to help enterprises adapt to the changes of the times and head-on walk in the front of the industry. The traditional industry CNC machining center is eager to take advantage of the situation to achieve transformation, in order to obtain greater development space.