The reason why the customized metal cutting disc is used to polish the hot plate
The grinding wheel can achieve the cutting angle when polishing the workpiece, ensure the synchronous consumption of the substrate and the mat of the abrasive cloth wheel, obviously improve the overall wear resistance and grinding efficiency of the flat abrasive cloth wheel, and prolong the service life of the abrasive cloth wheel. Then the reasons for the China cutting disc for metal to polish the hot plate are: First, when polishing, the strength used is too large, because the use of your strength is different, the effect of polishing is not the same, so the effect is not the same when used, so it should be properly controlled to polish The strength. Second, the chuck of the grinding machine is not locked or the slip caused by the failure of the grinding wheel is unqualified, so the quality of the grinding wheel must be checked before use, or the mechanical device, or the grinding wheel or Relock. Through the above introduction, we have learned the reason why the grinding wheel is slipping when the hot plate is polished. Therefore, we must use it well when using it. When the grinding wheel is used to polish the hot plate, we can solve the problem according to the above reasons.
Polishing technology diamond grinding block inspection
1. Inspection of appearance quality
There are no traces of the cracks in the diamond grinding blocks to be installed, and the traces of the deformation are different. Perhaps the surface is broken seriously. The number of grinding blocks in each box is the same, and the date of production is expired.
After checking the appearance quality of the grinding block, the unqualified grinding block is placed first and left to be treated. In case of accidents in the equipment, it is necessary to confess the number of grinding blocks that have been replaced, and then install it to prevent it. The corrective method for making mistakes is that the operator is extremely responsible for his job, and the officer cannot be careless.
The high performance cutting disc block placed on the machine indicates that the word side of the mesh is facing upwards, which is easy to distinguish. The grinding blocks placed on the grinding block are also separated by the same number of meshes. The number of stacked boxes is controlled at 2— 3 boxes, too high is not only bad-looking but also dangerous. Secondly, the most basic grinding blocks affect the quality due to the accumulation time.
After loading the grinding blocks in the future, you should also tighten them by hand one by one, check the confession once; loosely tighten, if it is too loose, you should use the packing tape prepared beforehand, until it is tightly tightened, and the safety protection door is fastened. Follow the operating procedures.
2. Inspection and correction of intrinsic quality
The date of production is one of the useful signs of whether the grinding block is expired. It is usually a useful period from February to March. If it exceeds its quality, it will be reduced. When using it, pay attention to the date of production of the grinding block.
Grinding block scratches often form a back throw on the brick surface, distinguishing the segment that is attacking is the key point. The coarsely ground scratches are deep and the lines are fine. Through the fine grinding of the medium and fine grinding, the surface of the scratches has the missing marks and the edges of the scratches are furry; the scratches of the medium and fine grinding are shallow and long, finely ground. Scratches are best distinguished, and the lines that float on the brick surface are wider. There are many reasons for the scratches, such as the hand integrity of the brick, the accuracy of the equipment function, the water quality and the formula of the grinding block itself, and the cleanliness of the grinding tool.
In the case of the grinding block itself, if it is judged to be a rough wear mark, check and consider from the following aspects: Is it wrong to install the wrong grinding block, the rough grinding is too thick, the medium fine grinding is not possible, and the medium fine grinding block contains coarser The gold steel sand, the coarse sand particles accumulate in the bubble hole of the grinding block.
Performance Analysis of Diamond Metal Wheels
This paper describes the performance, advantages, and disadvantages of diamond metal grinding wheels. Diamond or cubic boron nitride (CBN) abrasives are used to make super abrasive wheels. Due to the excellent grinding function of China cut off disc they have been widely used in all aspects of grinding.
Diamond grinding wheels grind high-hard and brittle materials for hard alloys, glass, ceramics, precious stones, etc. In recent years, with the rapid development of high-speed grinding ultra-fine grinding skills, higher requirements have been placed on the grinding wheel, metal bond grinding wheel It has been widely used due to its high bonding strength, good formability and long service life.
1, electroplated diamond wheel
Electroplated diamond wheel strength:
1. The electroplating process is simple, the capital is less, and the production is convenient;
2 .no need to trim, easy to use;
3 .single-layer structure has determined that it can reach very high operating speed, and now it has reached 250~300m/s abroad;
4. Although as long as a single layer of diamond, but still meet the lifespan;
5..About the precision requirements of the wheel grinding wheel, plating only production methods.
Because of these advantages, high-speed, ultra-high-speed grinding of electroplated grinding wheels has an undisputed dominant position. Electroplated diamond grinding wheel defects: the plating metal does not have a strong chemical metallurgical bond with the substrate and the abrasive bonding surface, and the abrasive is actually only mechanical. Embedding inlaid coating metal, so the steering force is small, the diamond particle load is heavier, the high-efficiency grinding is easy to fall (or the coating is peeled off), resulting in overall failure; in order to increase the maneuvering force, it is necessary to increase the thickness of the coating, and the result is abrasive grain exposure. The height of the chip space is reduced, the grinding wheel is prone to blockage, the heat dissipation effect is poor, and the surface of the workpiece is prone to burns. Now the domestic electroplating wheel production has not completed the optimal landform of the grinding wheel according to the processing conditions, and the inherent defects of the single-layer electroplated diamond wheel It will inevitably greatly constrain its efficient grinding use.
2. Single layer brazed diamond grinding wheel
In order to fully exert the diamond effect, we should try to increase the binding force of the bonding agent to the diamond and improve the bonding strength of the grinding wheel. The single-layer high-temperature brazing super-abrasive grinding wheel can overcome the defects of the electroplating grinding wheel and can complete the diamond, the bonding agent and the metal matrix. Chemical metallurgy combination, with high bonding strength, only need to maintain the thickness of the bonding layer to maintain the height of the abrasive grain by 20%~30%, and the large-load high-speed and high-efficiency grinding can firmly control the abrasive grains, so that the abrasive grinding wheel can reach the abrasive height. 70%~80%, so the chip space is increased, the grinding wheel is not easy to block, and the abrasive is used more and more.
Under the same processing conditions as the electroplated grinding wheel, the single-layer high-temperature brazing super-abrasive grinding wheel has lower grinding force, power loss and lower grinding temperature, which means higher working speed can be achieved. This ultra-high speed grinding of 300~500m/s or more Has a special meaning.
3. Sintered diamond wheel
Sintered metal bond grinding wheel is mostly made of bronze and other metals as a bonding agent. It is made by high-temperature sintering method. It has high bonding strength, good formability, high temperature resistance, good thermal conductivity and wear resistance, long service life and high load. Because the grinding process of the grinding wheel is inevitably shortened and deformed, it is necessary to shape the grinding wheel before use, but the dressing of the grinding wheel is more difficult. Now the common grinding wheel is not only time-consuming but also time-consuming, and the diamond particles are removed during the dressing process. More falls, the dressing wheel itself is very expensive, and the shaping accuracy is low.So try to choose high performance cutting disc
In recent years, scholars from various countries have successively carried out research work on trimming metal bond diamond grinding wheels by special processing methods, mainly including electrolytic dressing method and electric spark trimming method. The electrolytic dressing method is fast, but the shaping precision is not high; EDM trimming The method has high precision and can be shaped and sharpened, but the shaping speed is slow. The composite dressing method has electrolytic sparking composite trimming method and mechanical chemical compound trimming method. The dressing effect is good, but the system is messy, so the sintered type The grinding wheel grinding problem is still not well handled.
In addition, because the grinding wheel production process has determined that its appearance is random, the geometry of the abrasive grains, the dispersion and the height of the cutting edge are inconsistent. Therefore, as long as a small amount of high cutting edge is cut to the workpiece during grinding, the grinding quality is further limited. progress.
Production process of new polishing material
Polishing and grinding wheel processing is an important process in industrial products, especially in the production process of light industrial and mechanical products. It is suitable for the polishing of aluminum plates, stainless steel plates and high-quality products. It plays a key role in improving the surface quality of products. effect. At present, in China, the polishing of the surface of the product is generally carried out by using a cotton wheel with a corundum or a polishing slurry. Because the corundum is easy to fall off and the sand is uneven, it causes problems such as low production efficiency, high energy consumption, 12 inches cut off wheel , poor environmental sanitation, etc. At the same time, it consumes a large amount of cotton cloth every year, and the surface quality of the processed product is poor. Low precision.
Since the 1950s, industrial countries such as Europe, America, and Japan have widely used polishing tools that combine non-woven fabrics with synthetic resins. It has high cutting efficiency, good surface treatment effect, long service life and less sand falling, which is suitable for batch production of automated production processes. The production process of the new type of polishing material has roughly two processing methods: the sanding method and the sanding method.
Sand sand production process Using synthetic fiber as raw material and non-woven fabric production process, a certain thickness and high loft non-woven felt is obtained, and then the abrasive and the binder are uniformly sprayed and compounded onto the non-woven felt. After drying, the abrasive is bonded. The agent acts on the fibers to form a sand felt with a certain polishing ability.
1. Raw material specification requirements
Generally, PA6 or PA66 short fiber is used, the fineness is 9-15D, and the length is 51-65mm. In order to achieve high loft effect, the fiber has high curl selectivity. Generally, the crimping degree is 20 pieces/inch or more, or the spiral type crimped fiber; at the same time, in order to make the bonding sand have strong adhesive force, the fiber oil agent is not easy to be used. ,/p>
2. Sand specification requirements
The non-woven felt is used as a skeleton, and various kinds of fine silicon carbide (TL), corundum (GZ), ferric oxide (Fe2O3), aluminum-vanadium and other abrasives are sprayed on the surface, and the abrasive fineness is generally about 80-320 mesh. At the same time, the adhesive is sprayed and then solidified to firmly bond the abrasive to the fiber, so that the product has a sanding felt with a certain cutting ability.
Forming wheel hardness scheme
Since the forming wheel requires retention, increasing the hardness of the wheel is the best solution. However, many times the problem arises in terms of cutting force. Therefore, the cutting force of standard cut off wheel for metal is the key.
If the cutting force of the grinding wheel is good, the grinding resistance will become smaller, not only the speed of the feeding can be increased, but also the heat will be less. The degree of change in the heat of the grinding wheel is small, and the consumption of the grinding wheel is reduced. If the hardness of the crucible is required, the grinding temperature may rise higher and the speed of the grinding wheel may even increase.
In addition, whether the thin flat cutting disc can be self-sharped uniformly in one layer is also one of the key considerations for achieving molding accuracy. If the self-sharpening effect is too slow, it means that the workpiece is always pressed by the grinding wheel during the machining, instead of grinding the workpiece; thus the shape and dimensional accuracy of the workpiece is not easy to achieve.
The grinding wheel that is too slow and slow affects the uniformity of the grinding wheel, and the uniformity of the grinding wheel is also a key. If the grinding wheel is not evenly organized, the grinding wheel is prone to yaw vibration when it is rotated at high speed. The grinding wheel body is a hard and brittle material, and a large amount of minute vibration will cause micro-cracking of the grinding wheel and accelerate the consumption speed of the grinding wheel.
Whether the grinding wheel is even or not is important
By increasing the cutting force and uniformity of the grinding wheel, it is no longer limited and only increases the hardness. In this way, the advantages of high shape retention, surface roughness, and easy dressing can be achieved at the same time.
Grinding wheel selection skills
How to choose CBN grinding wheel
1. Reduce the temperature: stomata
The pores can be buried in the binder, allowing the grinding wheel to breathe and remove the heat without reducing the hardness of the wheel. Adding air holes not only heats up, but also increases cutting force.
2. Reduce vibration: ceramic inner disc
The general CBN/grinding wheel is used for thin abrasive cutting disc for metal , which is easy to affect the roundness due to thermal expansion, which in turn causes the grinding wheel to vibrate. Switching to the ceramic inner disc can reduce thermal expansion and effectively reduce the problems caused by vibration.
3. Reduce excessive feed and grinding resistance: The vent design increases the cutting force, and the design of the vents increases the cutting force. The cutting force is good, the grinding resistance is small, and the probability of scratches is greatly reduced.
How to choose a general grinding wheel
1. Reduce the temperature: air holes.
Increasing the pores is a good thermal removal method. Adding pores to the binder can effectively reduce the grinding temperature.
2. Reduce vibration, reduce excessive feed and grinding resistance: elastic structure.
The grinding wheel with elastic structure can be selected to absorb the vibration of the grinding machine and reduce the crushing. And release too much power, can produce a uniform grinding pattern.
Understand the self-sharpening effect of the grinding wheel
One of the main characteristics of the grinding wheel compared to other cutting tools is its self-sharpening effect. Due to this effect, in theory, as long as the self-sharpening characteristic does not disappear, the grinding wheel can always maintain a good cutting condition. However, due to the objective factors such as processing conditions, material of the grinding workpiece, abrasive grain characteristics, etc.the timing of this self-sharpening action, such as speed and slowness, will cause a great difference in the grinding results. The Aurora Abrasives summarizes the experience of a large number of selections and analyzes the China supply 7" cut off disc to explain the several common self-sharpening conditions of the grinding wheel:
If the self-sharpening effect of the grinding wheel occurs too slowly when needed, it will cause the abrasive grains of the grinding wheel to be passivated, but it will not fall off in time, resulting in a new abrasive cutting tip.. Just as we cut trees with an axe, the axe has been passivated. If it is not repaired in time, it will waste a lot of effort. For the grinding wheel, the grinding resistance will be greatly improved and the grinding efficiency will be reduced. In the case of passivation of the grinding wheel, the grinding wheel is still in a state of high-speed rotation, and the original grinding operation is transformed into a friction-like action, the grinding temperature starts to rise, and the workpiece exhibits thermal expansion and burns. In addition, since the abrasive grains are passivated, the grinding wheel continues to feed downward, and in the case where the grinding cannot be smoothly performed downward, a reaction force may occur, and an abnormal situation in which the vibration and the grinding sound become large may occur. It is necessary to pay special attention to the fact that the thermal expansion of the workpiece, such as knife, burn, vibration, etc. is very close to the result of the blockage of the grinding wheel. However, the cause is very different. If you misjudge, it is easy to choose the wrong solution. You need to pay special attention.
If the self-sharpening occurs too quickly, the phenomenon that the abrasive has not fully acted off will occur. Although new abrasive grains are continuously produced, it is easy to cut the knife very well, but the consumption of the grinding wheel body becomes too fast, the frequency of grinding wheel replacement increases, and a lot of cost waste is added. At this time,durable cutting off wheel must be considered. The importance of the off wheel is gone. If the self-sharpening effect is too fast, it is difficult to grasp the timing of the infeed, and it is not easy to achieve dimensional accuracy. The self-sharpening effect is too fast and the abrasive will fall off quickly. If the abrasive particles fall off too fast, the surface roughness will be poor, and even scratches may occur!
How to find the most suitable self-sharp speed, basically determines the quality of the grinding wheel! However, there is no standard general answer and a clear formula at this speed. This is because there are too many factors to consider, and we can only continuously accumulate the experience of selecting the grinding wheel. According to each processing site, grinding machine, operating conditions, incoming materials, and even trimming. The condition of the device is different to select the grinding wheel. Different processing environments, the optional grinding wheel is not the same. Even if the same product is processed and different factories evaluate all the subjective and objective conditions, it is not consistent to find out the most suitable specifications, so it cannot be completely copied.
