CNC Knowledge: The most complete grinding problem of the story

1. Factors affecting surface roughness of the grinding bed and its improvement measures

　(1) Factors related to grinding wheels. Mainly the size of the particles, the harshness and the cut of the sand wheel.

The more the size of the particles of the sandwheel is diluting, the more abrasives there are in the area of ​​the sandwheel unit, the more the surface is slim, the more the roaring value of the surface is small. However, the size of the particles is too thin, the sand wheel is easy to block, which increases the rough surface value, and at the same time, it is also subject to undulations and causes burns.

The hardness of the sand wheel refers to the difficulty of falling from the sand wheel after the grinding force is worn and cut. The sandwone is too hard, and the abrasive particles cannot fall after wear, which means that the surface of the part is strongly rubbed and pressed, increased plastic deformation, increases the roar value of the surface and easily causes burns. Also increase the surface roughness value, so the appropriate sand wheel must be selected.

The quality of repair of the sand wheel is closely linked to the cutting tools and the vertical supply of the sand wheel. The cutting of the sandwheel must eliminate the abrasive particles which have been passed by diamond to eliminate the outer layer from the sand wheel, so that the abrasive particle cuts the sharpness of the blade and reduces the roar value of the surface surface surface the surface of the surface. In addition, the smaller the vertical supply of the cutting wheel, the more the cutting microcontroller cutting on the fixed sand wheels, the better high nature, in order to obtain a smaller surface roughness value .

　　(2) Factors linked to room materials. Including the hardness, plasticity, thermal conductivity of the material.

The hardness, plasticity and thermal conductivity of room materials have a significant impact on surface roughness. Soft materials such as aluminum and copper alloys are easy to block sand wheels, which are difficult to grind. The heating alloy with great plasticity and poor thermal conductivity means that sand grains collapse early, resulting in an increase in the roughness value of the grinding surface.

　　(3) factors linked to treatment conditions. Including the quantity of grinding, cooling conditions and withstanding precision and vibrations of the process system.

The quantity of grinding is the speed of the sand wheel, the speed of the room, the grinding depth and the vertical foods. By increasing the speed of the wheel, it is possible to make the speed of transmission of the plastic deformation in surface metal cannot follow the grinding speed. Increase in the speed of the part, increase in plastic deformation and increased roughness of the surface. The more the grinding depth and the vertical supply volume are high, the greater the plastic deformation, which increases the surface roughness value. The temperature is high during grinding grinding, and the role of heat explains the main position, so that the role of the cutting fluid is very important. The cutting fluid can be used to reduce the temperature of the grinding area, reduce burns and rush from sand particles and shavings to avoid scratching the part, thus reducing the surface roughness value. But you must choose the appropriate cooling method and cut liquid.

In addition, for the external round grinding machine, the indoor round grinding bed and the flat grinding machine, the precision of the main axis of the sandwich wheel, the precision and stability of the D system ‘Food, rigidity and resistance to vibrations of the entire machine-tool are closely linked to surface roughness.

The above analysis analyzes the factors that affect surface roughness. How to reduce the surface roar value of the treatment surface, in addition to taking measures from the above aspects, can also be improved from the treatment method, such as grinding, polishing, super fine treatment, the polishing, etc.

Second, the sandwone cutting technique

XIU Rui is a process of processing raids that puts the sand wheel of the super hard particles. In this process, in addition to the liaison agent between the grinding particles and the blunt sand wheels, it is necessary to make a clear cutting blade in the salient liaison agent with strong performance of grinding. Xiurui must also eliminate the tiny materials from the pores on the surface of the wheel to prevent the grinding force on the wheel and increase the grinding force on the wheel, which will cause vibrations and cause the burn on the surface of the parts.

Without appropriate culture, even the best sand wheels cannot obtain high quality consistency and size of treatment parts. In fact, when you invest in high quality sand wheels, in order to obtain high grinding performance, it is very important to repair them well.

We can say that plastic surgery is part of the preparation of the wheels, which is carried out at the same time as the repair of ordinary sand wheels. For super hard grinding wheels, the two processes are carried out separately. In the use of ultra-Duv grinding grinding.

Before the grinding wheels include plastic surgery and repair, it is important to ensure that the main bearing of the tree is at a certain temperature (such as the usual sandwich grinding state). This can avoid the geometric shape of the parts and the abnormal wear of the wheel and cutting tools. Cutting tools should be treated carefully, as it is generally made of hard -resistant but crisp diamond equipment, and is very sensitive to tiny cracks and crushes due to a slight collision, stress.

Because diamond plastic surgery itself is a set of knives, it must be very lively. Use a blunt cutting tool to repair the surface of the wheel, which will make the wheel blunt. In order to maintain a high -quality and pointed diamond cutting tool each time, a single rotation point or a tapered cutting tool is required for a while. The number of rotations can be determined according to the cutting situation. For cutting tools for heads and chisel molding, they usually have to run 180 ° before they are blinked.

Most round mills are placed on the horizontal line of the pieces and sand wheels. The highest point of the parts of the parts and the highest point of the outer round of the wheel are called the point of contact of the parts / wheel. . For the indoor round crushing bed, the diamond repair tool is adjusted near the highest point of the exterior circle of the sand wheel (that is to say the point of contact of the parts / wheel during grinding of the hole), which is more important.

Take a mark

In order to reduce the cutting time, there seems to be a temptation to choose a greater depth of deepening. It is an extremely bad idea. The most appropriate repair depth must be selected to repair the wheel. The selection of a too large repair depth will generate a high cutting temperature, will reduce the life of the cut and remove the useful layer of sand wheels. The ultimate result is to damage the cutting cutter and the sand wheel, which is counterproductive. The best repair is that after several repairs, it can restore the geometric shape of the wheel, but also produce exactly a good border blade as standard. Use a cutting tool in one point to contact the wheel diameter with a 10-15O axis line. This will lead to a single point cutting tool to produce a net role when turned regularly. Multi-contact cutting tools do not need to be tilted. Instead of contacting the surface of the wheel with a cutting tool.

The horizontal movement speed is the speed of the cutting tool through the surface of the wheel during the garnish. It plays a key role in surface roughness and the cutting rate of the metals of treatment parts. The horizontal movement speed is too slow and the sand wheel will be blocked to damage the surface roughness and the metal cutting rate of the parts. Too slow horizontal movement speed can also cause the surface of vibration and wheel burns. A uniform and rapid horizontal movement speed can repair the surface of good sand wheels, improve wheel grinding performance, increase grinding efficiency and reduce the roughness of the room surface.

Cooler

Appropriate use of cooling fluid can speed up repair speed and improvement efficiency. Depending on the experience, a cooling of 3/8 in diameter can be selected, which can exclude a large amount of calories from the trial cutting and prolong the life of the cut. When the diamond cutting tool is installed by the wheel, a cooling liquid is installed and the entire surface of the sand wheel is covered or continuously injected the coolant to the diamond repair tool. When the cutting tool is in contact with the sand wheel, it will never accept the cutting tool and will come out of the coolant. Otherwise, this will cause a crack or rupture under the change in extreme cold and hot temperatures.

Using a filter for a high -provisioning filtering of the cooling fluid can avoid several cycles of dirt or dandruff in the coolant. The contaminated cooling fluid can quickly carry the wheel and increase the wheel cut. It is only when the dry grinding (only in this case, the cooling of the diamond cutting tools can be interrupted) and the grinding wheel can be used to repair the wheel. Before the work is done every day, turn off the coolant and let the wheels empty for a few minutes. This can prevent the wheel from the wheel.

Vibration is the enemy of the cut

In the cut of the wheel, it is necessary to effectively reduce vibrations and avoid leaving cutting marks, collisions and damage on the surface of the wheel, which is essential. This means that the balance of sand wheels should be preserved, which is determined by the structural characteristics of the sandwheel itself. The unequal density and the quality of the geometric shape of the whole sand wheel will affect the inherent balance of a sand wheel. Therefore, it is also important to choose a high quality sand wheel. If it is a high quality sand wheel, you can keep the wheel a good balance in the right installation. According to the factory instructions of the sand manufacturer, there is an ascending arrow marked on the sand wheel, which shows that the wheel is a light position after the rough balance. Then the user can give the arrow instructions and pay attention to the cutting wheel to obtain a dynamic balance. Cooling of the injectable liquid uniformly, it can sometimes help sand wheels maintain a balance.

In order to avoid more vibrations, it is necessary to ensure that the cutting tool is firmly tight on the clip and maintains the minimum amount of suspension to ensure that the repair tool has sufficient rigidity. If the diamond tool is not firmly tight, it will cause vibrations and noise.

A super hard crushing wheel must be plastic and cultivated before starting grinding. Following the experience introduced in this article will help your sand wheels produce the most crushing effect.

Third, the impact of the clarification of milling on the precision of parts processing

Geometric accuracy, rigidity, thermal deformation, movement stability and resistance to the vibrations of the grinding bed will directly affect the treatment accuracy of the part.

　　(1) The geometric precision of the crusher,It refers to the accuracy of the exercise and the precision of the mutual position of each component when the load is not offered. It is impossible to make machine tools absolutely precise, and there are always inevitable errors. This error reflects the part of the part of the part to different room degrees, which affects the treatment accuracy of the part. Generally, the radial beat and the axial movement of the main axis, the rectitude of movement components such as work work, mutual position error and the transmission error of the work component.

The radial beat and the axial movement of the main axis of the sandwheel and the axial directional movement and the mobile error of the head of the grind will affect not only the roughness of the rough surface of the workers after crushing, but will Also generate a rolling up work room and final surface beat, resulting in an unequal spark during the grinding process. When the uuchete moves the vertical surface of the vertical surface, it affects the right linearity of the parent line of the room inside and external round grinding beds, and the plane grinds the aircraft on the crushing bed of plane, causing a large error error in the work room. The median line of the range of the sandwheel and the crushing of round interior is not shouting grinding grinding are not equal to the central line of the headrest . The central line of the sandwone spindle is not parallel to the movement of the ouchette movement, affecting the worker’s ground surface after the grinding room. The crushing bed driving error has considerably affected the precision of the treatment of the crushing of the wire and the grinding of the gears.

　(2) The rigidity of the grinding bed.It refers to the ability to resist deformation when the grinding machine is affected by external forces (grinding force). That is to say that the smaller the deformation of the components, the greater the deformation of the components. Conversely, the deformation of the components is large, which indicates that the rigidity of this part is small. These distorted sizes destroy the primitive geometric precision of the abrasive bed, which will cause the treatment error of the room. Consequently, the machine tool with good rigidity and the precision of treatment of the part.

　　(3) Thermal deformation.The heat sources inside the grinding bed are distributed unevenly, and the heat generated by each part in the exercise is also different. Machine-tool and affects the precision of the treatment of the part. Therefore, the precision grinding machine is better installed in the room at constant temperature to prevent temperature changes from affecting the accuracy of machine tools and parts.

　(4) Cracks of abrasive movement components.Movement components such as collision wheel support are incorporated into periods of trace or moved continuously at low speed, and an unequal movement occurs, which is commonly called ramp. When the grinding machine has this phenomenon, food food during the grinding process is uneven and rough surface roughness of the room is affected.

(5) Vibration of the grinding bed.During the grinding process, the grinding bed produces vibrations, so that the sandwone and the room asked the relative position to change the periodic change, so that the surface of the part produces vibration models, which seriously affects the quality and precision of the treatment.

To improve the accuracy of workers after grinding, in addition to efforts to eliminate the impact of the above factors, we must also pay attention to the reasonable selection of the positioning reference in the process of room treatment, of choice and the correct repair of the sandwheel, the reasonable selection of the quantity of grinding and the process method of the processing method, and the method of the process method.