Category Archive CNC Technology

In the work, we have a lot of things are very important, because in the production process, we have a lot of matters to pay attention to, in the process, there are factors that will lead to the effect of the work. There are many times because of a small choice and affect the final effect, then in the process of CNC machining, the cutting amount is very important, so let’s understand how important the choice of cutting amount of CNC machining is?

Cutting speed, feed rate and cutting depth are the three factors of cutting conditions of CNC lathe, which directly cause tool damage. With the increase of cutting speed, the tool tip temperature will rise, which will produce mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.

The relationship between feed condition and tool back wear occurs in a very small range. But the feed rate is large, the cutting temperature rises, and the back wear is large. It has less effect on the tool than the cutting speed. Although the influence of cutting depth on the tool is not as great as the cutting speed and feed rate, but when the cutting depth is small, the hardened layer of the material to be cut will also affect the tool life.

The user should select the cutting speed according to the material to be processed, hardness, cutting state, material type, feed rate, cutting depth, etc. The most suitable processing conditions are selected on the basis of these factors. Regular and stable wear is the ideal condition for service life. However, in practice, the choice of tool life is related to tool wear, size change, surface quality, cutting noise and processing heat. When determining the processing conditions, it is necessary to study according to the actual situation. For stainless steel and heat-resistant alloy and other difficult to machine materials, can use coolant or choose a good rigid blade

In the production process, we always encounter some new problems, of course, problems will directly affect our work efficiency, in this process, there will be many uncontrollable factors, resulting in the quality of products can not be guaranteed, not only external factors are very important, but also the original mold equipment has a great impact. Parts will also deform during processing. If this happens, we need to stop working immediately and carry out correct treatment. What should we do to prevent this situation in the later stage?

1、 In order to reduce the influence of cutting force and cutting heat, the deformation caused by rough machining can be corrected in finish machining.

2、 To reduce the influence of clamping force, the following measures should be taken to reduce the influence of clamping force:

1. When using radial clamping, the clamping force should not be concentrated on a certain radial section of the workpiece, and the operator should make it distributed over a large area to reduce the clamping force on the unit area of the workpiece.
2. The position of clamping force should be selected at the part with strong rigidity to improve the deformation of thin-walled parts under the action of clamping force.
3. The direction of clamping force is changed from radial clamping to axial clamping.
4. It is suggested that before purchasing computer gong equipment, the manufacturer must have a detailed understanding and investigation. In order to reduce the clamping deformation, special claws are used to clamp the workpiece, and the convex edge is cut off at the end of processing.

As we all know, CNC high gloss machine is a kind of automatic machine tool controlled by program. The control system can process the program with control code or other symbol instruction rules logically, and decode it from beginning to end by computer, so that CNC lathe can act and process parts, and the blank material can be processed into semi-shaped articles and molded parts by cutting tools all the time. So how to determine the route of CNC highlight machine? Let’s take a simple look:

The feed machining route of CNC high gloss machine refers to the path from the start of tool setting point (or CNC lathe’s unchanged origin) to returning to the point and ending the machining program, including the path of cutting and the non cutting path of tool cutting in and cutting out. The feed path of finish machining is basically carried out in sequence along the appearance of the parts. Therefore, the focus of confirming the feed path is to confirm the feed path of rough machining and empty stroke.

The above is the principle to determine the machining route of CNC high gloss machine. Due to its good rigidity, high manufacturing accuracy, accurate tool setting, and convenient dimensional compensation, it can process parts with high dimensional accuracy and complex contour shape.

We all know that many mechanical equipment in the installation of the environment are certain requirements, because the installation directly affects our later use, one step of the installation is not correct, or in other words, there are some environmental impact during the installation process, so the later work is also likely to be affected, so let’s learn about CNC plus What are the environmental requirements for installation?

1. Location requirements

It should be far away from the vibration source and direct sunlight. If there is a seismic source nearby, an earthquake proof trench should be set up.

1. Temperature and humidity

The optimal processing temperature of CNC machining center is below 30 ℃. If the ambient temperature and humidity are too high, the service life of the control system components may be reduced. If the ambient humidity is too high, it may lead to the short circuit and fault of the integrated circuit board.

1. Voltage and current control

There are many processing equipment in the workshop, which will cause excessive fluctuation of the power grid. We need to control the voltage and current within the allowable range of the machining center and keep it stable, otherwise, the work of the system may be affected

In the process of processing, we will certainly encounter some unexpected accidents. If there are some accidents in the process of processing, there must be a certain degree of danger, so we must do some preventive measures to avoid the real failure and injury to people. Then we will learn how to control the spring knife in the cutting process of CNC machining center.

In the process of machining, the length of the tool should be shortened as far as possible to reduce the risk of tool bounce. The relationship between tool deformation and tool diameter is the fourth power. For the same length of tool, when the tool diameter is reduced by one time, the deformation will increase by 4 times. In the process of processing, if possible, select large-diameter cutting tools or use reinforced cutting tools to reduce the risk of knife snapping. (as shown in the figure on the right below: a uses the heat cable and taper neck knife, and B uses the tool with strong handle for processing)

The deformation of the tool is in direct proportion to the force exerted on the tool in the process of machining. Reducing the force on the tool can reduce the chance of snapping the tool. The following methods can be used to reduce the force on the tool in machining.

Reduced force analysis:

Cutting is a process of shear deformation. Each material has its own strength (σ). In order to separate the materials, the strength from outside must be greater than that of the material itself.

The so-called five axis machining here means that there are at least five coordinate axes (three linear coordinates and two rotation coordinates) on a machine tool, and the machining can be carried out simultaneously under the control of computer numerical control (CNC) system. Compared with the general three axis NC machining, this kind of five axis CNC machining has the following advantages:

1、 It can process continuous and smooth free-form surface which can not be machined by general three-axis or it is difficult to finish machining by clamping at one time. For example, the blades of aeroengine and steam turbine, the screw propeller used in naval ships, and many shells and moulds with special curved surfaces, complex cavities and holes, etc. for example, with the ordinary three-axis numerical control, because the pose angle of the cutter relative to the workpiece cannot be changed in the process of machining, there may be interference or under machining (that is, the machining can not be achieved) when machining some complex free-form surfaces. When machining with five axis linkage machine tool, the tool / workpiece pose angle can be adjusted at any time in the process of processing, so that the interference of tool and workpiece can be avoided and all machining can be completed at one time;

2、 It can improve the machining accuracy, quality and efficiency of free-form surface. For example, ball end milling cutter is often used when machining complex curved surface by three-axis machine tool. Ball end milling cutter is formed by point contact, and the cutting efficiency is low. Moreover, the pose angle of cutter / workpiece cannot be adjusted in the process of machining. Generally, it is difficult to ensure that the best cutting point on the ball end milling cutter (i.e. the highest linear speed point on the ball head) is used for cutting, and it is possible that the cutting point falls on the ball end cutter, and the line speed of the ball end cutter is equal to The situation on the center line of rotation of zero. However, if the five axis machine tool is used, because the position and attitude angle of the tool / workpiece can be adjusted at any time, this situation can not only be avoided, but also the best cutting point of the tool can be made full use of at all times, or the ball end milling cutter formed by point contact can be replaced by the spiral end milling cutter formed by point contact, and even milling can be carried out by further optimizing the pose angle of the cutter / workpiece In order to obtain higher cutting speed and line width, higher cutting efficiency and better surface quality can be obtained.

3、 Advantages of mold processing. In the traditional mold processing, the vertical machining center is generally used to complete the milling of the workpiece. With the continuous development of mold manufacturing technology, some weaknesses of the vertical machining center become more and more obvious. Ball end milling cutter is widely used in modern mold processing. The advantages of ball end milling cutter in mold processing are obvious. However, if the vertical machining center is used, the linear speed of the bottom surface is zero, so the bottom surface finish is very poor. If the four or five axis linkage machine tool processing technology is used to process the mold, the above shortcomings can be overcome. The use of five axis machine tool processing mold can quickly complete the mold processing, fast delivery, better guarantee the mold processing quality, make the mold processing easier, and make the mold modification easier

In order to process the surface that meets the technical requirements of the regulations on a certain part of the CNC machining parts, before machining, make sure that the CNC machining parts occupy a certain precise position on the machine tool related to the equipment. This process is usually called “positioning” of CNC machining parts. After CNC machining parts are positioned, due to the effect of cutting force and gravity in the machining process, the positive organization should be selected to “clamp” the workpiece to keep its positive position fixed. The whole process of workpiece from “positioning” to “clamping” is called “installation”. How to store CNC machining parts

The installation of CNC machining parts is an important issue in mold processing. It not only directly affects the machining accuracy, the speed and stability of workpiece installation, but also affects the production rate. In order to ensure the relative position accuracy between the machined surface and its design datum, the design datum of the machined surface should occupy an accurate position relative to the machine tool when installing CNC machined parts. When the workpiece is installed, its design datum must coincide with the axis line of the machine tool spindle.

When machining parts on different machine tools, there are different installation methods. The installation methods can be summarized as direct alignment method, marking alignment method and fixture installation method.

CNC processing is a relatively complex work, which requires professionals to operate. It is not allowed to work without professional training. So many teachers said that because the processing steps are too complex, sometimes a lot of time will be wasted, so they studied some time-saving skills. Now we will learn how to make five Axis CNC machining become a simple way!

(1) Area to be processed and processing sequence. This step is based on the complexity of the component shape, and is often the most easily inspired by skilled mechanics.

(2) What shape should the tool path have in the machining area? Should the tool be allowed to cut in front of back or up and down according to the parameterized lines of the surface, and the surface boundary should be used as a guide?

(3) How to guide the tool axis to match the tool path is very important for the quality of surface finish and the use of short hard tools in narrow spaces. Mold manufacturers need to have adequate control of the tool, including the rake angle when the tool is tilted. In addition, many turrets must be considered when turning the turret. For example, there is a limit to the degree of rotation of milling / turning machines.

(4) How to change the cutting path of the tool? How to control the displacement of the tool due to reset or generated at the starting point of the tool path and the displacement that the tool must produce between the processing areas? The displacement generated during the conversion process is very important in the mold production, which can eliminate the evidence line and the trace generated by the tool (it can be removed by manual polishing afterwards)

报错 笔记

In fact, no matter what the equipment is, the installation environment is very important. It’s not to say that the environment is particularly good, but it can’t be too bad. For example, the floor can’t be uneven. So let’s learn about the requirements of CNC machining center on the installation environment?

1. Location requirements

It should be far away from the vibration source and direct sunlight. If there is a seismic source nearby, an earthquake proof trench should be set up.

1. Temperature and humidity

The optimal processing temperature of CNC machining center is below 30 ℃. If the ambient temperature and humidity are too high, the service life of the control system components may be reduced. If the ambient humidity is too high, it may lead to the short circuit and fault of the integrated circuit board.

1. Voltage and current control

There are many processing equipment in the workshop, which will cause excessive fluctuation of the power grid. We need to control the voltage and current within the allowable range of the machining center and keep it stable, otherwise the work of the system may be affected. The power supply shall be 380V ± 10%, three-phase AC.

As we all know, after the installation of CNC machining center, the acceptance still needs to be done, because the acceptance of CNC machining center directly affects the equipment put into use of the manufacturer. The general factory acceptance standard is to directly carry out the workpiece processing test. In fact, after the workpiece processing test, it can be basically determined that the key parts of the machining center meet the standards, and in the case of normal use There is no problem. About CNC machining center spindle performance inspection is what?

1. Select low, medium and high speed. The main shaft starts 5 times in a row, then stops the operation to check the flexibility and reliability of its action. At the same time, check whether the power display on the load meter meets the requirements.
2. It can input data manually, so that the spindle gradually increases from low speed to the maximum allowable speed. Check whether the speed is normal, the general allowable error should not exceed ± 10%. While checking the spindle speed. Observe whether the noise, vibration and temperature rise of the spindle are normal. The temperature rise of the spindle is 15 “C after running at high speed for 2 h.
3. In order to check the flexibility and reliability of the spindle action, the spindle can be stopped accurately and operated continuously for more than 5 times.

CNC machining refers to NC machining, which is a method of controlling mechanical movement and machining process by using digital information.

The traditional mechanical processing is operated by hand with ordinary machine tools. When machining, the metal is cut by hand shaking the mechanical cutter, and the accuracy of products is measured with caliper and other tools by eyes. However, the traditional manual processing is far from meeting the production requirements.

Therefore, the emergence of CNC machining provides the possibility for the standardization, accuracy and efficiency of machining, and CNC machining is also brilliant in the radiator industry.

In order to obtain high-quality products, ordinary processing technology must have complex processes, such as the selection of cutting route, shape and size of radiator panel, and the force used for processing on different materials is not the same, so in order to reduce the error in the specific operation, the efficiency must not be high.

However, with CNC processing, all processes are first arranged and designed, incorporated into the processing program, simplify the process and carry out each step orderly, without affecting the efficiency of human factors, greatly improving the production efficiency of manufacturers.

Nowadays, many businesses not only have high requirements for the heat dissipation performance of the radiator, but also have the pursuit on the beauty of the appearance, and the application of CNC processing can achieve compatibility between the two.

CNC machining quality is stable, the finished product surface texture is clear, metal texture is strong, smooth, no scratch, no missing angle, and the heat dissipation coefficient strength of raw materials will not be changed under precision processing.

Manufacturers can adjust the specific process in the process to enhance its heat dissipation performance, such as Zhigao’s oxidation, wire drawing, paint baking, sand blasting and other processes can be carried out under the CNC operation.

It is believed that friends who have been in contact with radiators are not unfamiliar with fin shaped radiators and sunflower radiators. In fact, CNC processing is indispensable to the production of radiators with special requirements on the appearance.

Traditional processing technology for special, complex parts can not achieve high-efficiency and fine production, and with the help of numerical control processing, you only need to set the programming to process the desired surface, and the finished product is firm and durable, accurate and tight.