Precautions for the use of Vitrified bond super hard grinding wheel
A circularly-bonded abrasive having a through hole in the center made of an abrasive, a binder, or the like. The grinding wheel is the largest and the most widely used one. It can be coarsely ground, semi-finished and polished on the outer circle, inner circle, plane and various profiles of metal or non-metal workpieces. Fine grinding and grooving and cutting. There are many types of grinding wheels. According to the abrasive used, it can be divided into ordinary abrasive (corundum and silicon carbide) grinding wheel and super hard abrasive (diamond and cubic boron nitride, etc.) grinding wheel; according to the shape, it can be divided into flat grinding wheel, oblique side grinding wheel, cylindrical grinding wheel and cup grinding wheel. , disc-shaped grinding wheel, etc.; according to the bonding agent can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel and so on. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, bonding agent, shape and size. Since the grinding wheel usually works at high speed, the slewing test (to ensure that the grinding wheel does not break at the highest working speed) and the static balance test (to prevent machine vibration during operation) should be performed before use. After the grinding wheel has been in operation for a period of time, it should be trimmed to restore the grinding performance and the correct geometry.
The use of grinding wheels is dangerous. For your safety, please note the following precautions:
Grinders are one of the most commonly used machines in machinery factories. Whether it is installed properly and meets the safety requirements; whether it is used correctly and in compliance with the safe operating procedures. These problems are directly related to the personal safety of each employee, so we must pay enough attention to us in actual use.
The precautions during the installation process
1.Positioning problem of Diamond Grinding wheel
Where is the grinder installed?
It is the first problem to be considered during the installation process. Only when a reasonable and appropriate position is selected can we carry out other work. Grinding machines are forbidden to be installed in the vicinity of the equipment and operators or in places that are often visited. Generally, larger grinder rooms should be installed in the larger workshops. If it is not possible to set up a special grinder house due to the limitation of the topography of the plant, a protective baffle of not less than 1.8 m in height should be installed on the front side of the grinder, and the baffle plate is required to be firm and effective.
Balance problem: The imbalance of the grinding wheel is mainly caused by the inaccurate manufacture and installation of the grinding wheel, which makes the center of gravity of the grinding wheel not coincide with the rotary shaft. The damage caused by imbalance is mainly manifested in two aspects. On the one hand, when the grinding wheel rotates at high speed, it causes vibration, which is easy to cause polygonal vibration marks on the surface of the workpiece. On the other hand, the imbalance accelerates the vibration of the main shaft and the wear of the bearing. This can cause the grinding wheel to rupture and even cause an accident. Therefore, it is required that the grinding wheel of the public building with a straightness greater than or equal to 200mm should be statically balanced after the chuck is installed. When the grinding wheel is deformed after plastic shaping or during work, the static balance should be repeated.
The matching problem mainly refers to the installation and matching of the chuck and the grinding wheel. According to the standard requirements, the diameter of the grinding wheel chuck should not be less than 1/3 of the diameter of the mounted grinding wheel, and the new grinding wheel should be replaced when the corresponding grinding wheel is worn to a diameter 10 mm larger than the diameter of the chuck. In this way, there is a problem of matching the chuck and the grinding wheel. Otherwise, there will be such a situation that the “large horse-drawn carriage” causes waste of equipment and materials; the “small horse-drawn carriage” does not meet the safety requirements and is liable to cause personal accidents. Therefore, the reasonable matching of the chuck and the grinding wheel can save equipment and cut the material on the one hand, and meet the requirements of safe operation on the other hand. In addition, a cushion with a diameter larger than 2 mm of the chuck and a thickness of 1 mm to 2 mm should be installed between the grinding wheel and the chuck.
Protection problem: The protective cover is the most important protection device of the grinder. Its function is: When the grinding wheel is damaged due to work, it can effectively cover the grinding wheel debris and ensure the safety of personnel. The shape of the wheel guard is round and square, and the maximum opening angle is not allowed to exceed 90°; the material of the shield is steel with a tensile strength of not less than 415 N/mm2. When replacing a new grinding wheel, the protective cover should be installed firmly and reliably, and the protective cover should not be dismantled or discarded.
Blocking the screen is one of the main protective attachments of the grinder. The opening of the guard above the horizontal plane of the main shaft is greater than or equal to 30 (this device must be provided. Its main function is to block the flying during the grinding process, so as not to hurt The operator is installed at the positive end of the protective cover opening, the width should be larger than the width of the wheel guard, and should be firmly fixed to the protective cover. In addition, the clearance between the circumferential surface of the grinding wheel and the baffle should be less than 6mm.
The bracket is one of the commonly used attachments for grinders. Adjustable brackets must be provided for grinders with a specified grinding wheel diameter of 150 mm or more. The distance between the grinding wheel and the bracket should be less than 1/2 of the minimum shape of the workpiece to be ground, but the maximum should not exceed 3 mm.
Grounding problems Grinding machines use power lines, so the housing of the equipment must have good grounding protection. This is also one of the important factors that cause accidents.
2. Precautions during use
Side grinding problem: In the daily use of the grinder, we often find that some operators do not divide the type of grinder, regardless of the type of grinding wheel, and use the side of the grinding wheel to grind it at will, which is a serious violation of safety. Violation of operating procedures. According to the regulations, the grinding wheel with the circumferential surface as the working surface should not be grounded. The radial strength of the grinding wheel is large and the axial strength is very small. When the operator is too strong, the grinding wheel will be broken and even hurt. In practice This behavior should be prohibited during use.
Positive operation problems: In daily use, many operators are always used to operate on the grinding wheel because the direction can be used. In fact, this behavior is a special prohibition in the operation of the grinder. According to the operating procedure, when grinding the workpiece with a grinder, the operator should stand on the side of the grinding wheel and must not operate on the front side of the grinding wheel to avoid the grinding wheel flying out or the grinding wheel breaking out and injuring people when the grinding wheel fails.
Forced operation: When the grinder is used, some operators, especially young operators, are trying to grind quickly and use too much force. This is an extremely unsafe operation. The flatness of any grinding wheel has a certain strength, which is likely to cause the grinding wheel to break, or even fly out and hurt people, it is also a behavior that should be prohibited.
Common operational problems: in the actual daily operations, also have such happens, someone to catch production tasks Rob work time, two people share a grinder operation at the same time, this is a serious violation of operation behavior, should be strictly prohibited a grinder with enough time, can use to add grinder solution, is absolutely not allowed to share at the same time a grinder.
3. Precautions during the replacement process
Wear problem: Any grinding wheel has its certain wear and tear requirements. If the wear condition reaches a certain level, it must be replaced with a new one. It is not necessary to use excessive wear in order to save materials. This is a very unsafe violation. It is generally stipulated that the new grinding wheel should be replaced when the grinding wheel is worn to a diameter 10 mm larger than the diameter of the chuck.
Validity issue: The new grinding wheel that is taken from the warehouse is not necessarily a qualified grinding wheel. Even the new grinding wheel purchased from the manufacturer is not necessarily a qualified grinding wheel. Any grinding wheel has a certain expiration date and is used within the effective period. It is a qualified grinding wheel; if it is used beyond the expiration date, it is not necessarily a qualified grinding wheel. The regulations stipulate that “the grinding wheel should be used within the validity period. The resin and rubber bond grinding wheel must be subjected to the rotation test after one year of storage. Only qualified persons can use it”.
Texture problem: If there is any crack in the grinding wheel during use, stop using it immediately and replace the new grinding wheel to avoid causing the grinding wheel to break and hurt people.
4, other matters needing attention
Environmental problems: Grinding machines should generally be equipped with special grinder houses. It is strictly forbidden to stack inflammable and explosive materials near the grinder room or grinder to avoid fire or explosion accidents, and should not place other parts in the vicinity of the grinder.
Management problems Grinding machines should be specially staffed. When non-unit personnel want to grind objects on the grinder, they must be authorized by the full-time responsible person, and strictly abide by the safe operating procedures. It is strictly forbidden to use the grinder without the consent of the responsible person. In addition, the replacement of the grinding wheel should also be carried out by a special person, and it is forbidden for others to replace and install the grinding wheel.
Closed car problem: After the operator stops working, he should immediately turn off the car. It is forbidden to idle the grinder in the absence of use and unmanned management. In addition, the cleaning of the medium and short wave turbines should be maintained after use.
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