Abstract:
In recent years, it is often seen that the news about the breakage of the grinding wheel hurts people. Many enterprises will push the responsibility of grinding wheel rupture to the grinding wheel manufacturer. In fact, the reason for the fracture of the grinding wheel has quality problems, but it is also related to storage and transportation and the use of the grinding wheel. Here, we will give you a detailed explanation of the reasons why the grinding wheel breaks.
Grinding wheel production quality and inspection
1, grinding wheel production quality
To ensure the quality of grinding wheel production, high-quality raw materials, bonding agents and advanced production processes must be used. At the same time, we should also pay attention to the production process and the quality of workers. Only when many aspects of the problem have been paid attention to, in order to produce high-quality grinding wheels.
2, grinding wheel quality inspection
After the grinding wheel is out of the oven, it should be tested for balance, sound check for cracks, rotary test, etc. To ensure that the grinding wheel in use, meet the requirements of the workpiece.
Storage and transportation of grinding wheels
1. Storage of grinding wheel
The grinding wheel should not be stored in a place that is prone to moisture, freezing and high temperature, the rubber grinding wheel should avoid contact with the oil, the resin grinding wheel is appropriate for one year, and the grinding wheel that exceeds the storage period can be used after strict inspection to confirm that there is no problem.
2. Transportation of grinding wheel
(1) The grinding wheel must be completely packed and transported and avoid collision, shall not be exposed to moisture for a long time, and shall not be in contact with alkali;
(2), the grinding wheel is stacked neatly in a flat way, and can not be tilted and pressured for a long time to prevent deformation;
(3) Avoid direct contact with the ground, must be stacked with wood pallet with tide, 10-15cm above the ground is appropriate, stacking height does not exceed 1 meter;
(4) Implement the first-in-first-use principle to ensure the best use period of the product;
(5) The product should be retested for rotary strength and appearance for more than one year before it can be used.
Use of grinding wheel
Grinding wheel use, according to different industries, different processing methods, different grinding machines will have many different characteristics. Here we pick up some common problems to explain.
1. Rupture caused by grinding wheel cracking
Problem 1: When the grinding wheel hole is small or the shaft is large, it is hard to load
Solution: The hole and shaft of the grinding wheel should be able to be smoothly loaded, but not hard loaded
Problem 2: Use flanges on one side
Solution: The size of the grinding wheel flange should be exactly the same on both sides and be evenly tightened
Problem 3: Uneven support of the flange (flange bending; Lead hole layer protrudes; Flange burr; Uneven grinding wheel surface)
Solution: The left and right sides of the grinding wheel flange should be finely machined into the correct and smooth size specified, the plane part of the grinding wheel should be accurately machined, and the lead filling layer should not bulge out of the plane.
Problem four: The two flanges are of different sizes
Solution: The left and right flanges must use the same size flanges
Problem 5: When a gasket is needed, there is no gasket or the gasket is too thin after the diameter is small
Solution: Use gaskets with high strength and large diameter
Problem 6: There is no groove on the inside surface of the flange or its diameter is small
Solution: The inner surface of the flange must be provided with a groove of the specified size
Problem seven: The fastening force of the nut is too large
Solution: The fastening nut of the flange starts from the idea that you really want to clamp the grinding wheel, and often the fastening force is too large, but too much fastening force will make the flange skew and make the local force of the grinding wheel large, so it should be properly fastened
Problem eight: Only considering the grinding power abuse of the grinding wheel
Solution: Because the grinding wheel with coarse grain size or low hardness has a particularly small strength, it is necessary to pay attention to the efficiency of grinding such as regrinding
2. The linear speed of the grinding wheel is too large
Problem: When the speed of the sand wheel shaft is too high, when the grinding wheel with a larger diameter than the previous grinding wheel is used
Solution: Change the speed of the sand wheel shaft, so that the line speed of the grinding wheel is within the range of the highest line speed or use a small diameter grinding wheel
3. The workpiece is stuck between the workpiece support and the grinding wheel
Problem 1: The workpiece support is not properly adjusted
Solution: The interval between the workpiece support and the grinding wheel working surface is less than 3mm
Problem 2: Firmly load the workpiece between the workpiece support and the grinding wheel
Solution: The workpiece is supported by the workpiece bracket and cannot be firmly loaded between the grinding wheel and the workpiece bracket
Problem 3: When the side grinding is carried out without setting up the side grinding workpiece frame
Solution: The flat grinding wheel is prohibited for side grinding, and the bowl grinding wheel is used for side grinding. The workpiece support is set up correctly
4, the inspection of the grinding machine is insufficient or the machine tool is inappropriate
Problem 1: The bearing is loose, the spindle is bent, and the accuracy of the grinding machine is significantly reduced
Solution: Check and repair grinding machine, seeking to improve its accuracy
Problem 2: The shaft diameter of the sand wheel shaft is too small
Solution: If there is a grinding wheel of the same size as the shaft, use the same grinding wheel
Problem 3: Rough grinding or the wrong method of using the grinding wheel
Solution: Rely on the skilled person's guidance or the wheel instruction manual to carry out the correct grinding operation
5. When the unbalance of the grinding wheel is too large
Problem 1: The balance check of the grinding wheel manufacturer is insufficient
Solution: On the balance rack, recalibrate the balance
Problem 2: The grinding wheel contains some water
Solution: The grinding surface is idled in the state of stopping water injection
Three: When using the side of the grinding wheel, the use of the grinding wheel is regulated, and it is strictly prohibited to use a grinding wheel other than the side for side grinding
6, grinding wheel strength is small
When the side of the grinding wheel is used, the use of the grinding wheel is regulated, and it is strictly prohibited to use a grinding wheel other than the side for side grinding
7. Spindle diameter and grinding wheel aperture are not suitable
Problem: The diameter of the grinding wheel is too small than the standard size, and it is hard to install on the spindle
Solution: There should be a proper gap between the grinding wheel hole and the spindle. It is strictly prohibited to load the grinding wheel hole
8. Side grinding with inappropriate grinding wheel
When using a wheel other than a side grinding wheel, the wheel used for side grinding (bowl wheel, etc.) must be used.
9, the grinding wheel quality change
Problem: When the grinding wheel encounters flood or fire, the resin bond and rubber bond grinding wheel must change in quality
Solution: Confirm the way to enter the grinding wheel, the correct storage should consider the manufacturing year of the grinding wheel, and strictly carry out the inspection before use
10, in the radius direction of the rupture into more than three occasions
Problem: the grinding wheel using line speed is too large; Lack of grinding wheel gasket; The grinding wheel hole is too small; Flange shape does not fit and screws tighten too tightly
Solution: Strictly adhere to the highest line speed according to the type of grinding wheel,
Yang Niuniu:
11, the occasion of breaking into two pieces in the radius direction
Problem 1: The grinding wheel has cracks before use
Solution: Strict inspection before installation
Problem 2: Overuse the side of the grinding wheel
Solution: Do not use the side of the grinding wheel
12. Irregular damage
Problem: the quality of the grinding wheel is not good; The grinding wheel is pressed by heavy objects; Unreasonable installation of grinding wheel
Solution: To ensure the quality of the product, enter the inspection to study its condition in detail and prohibit heavy pressure on the grinding wheel installation to be smooth.
