With the deepening of reform and opening up and the rapid development of industrial technology,sanding belt grinding with high efficiency, high economy and a wide range of applications is more and more attention by the wood processing industry, many enterprises in order to improve the quality and grade of products, are using or preparing to use the advanced processing technology of belt grinding.
Because the application and research of abrasive belt grinding in our country is still in the initial stage, so the knowledge about the use of abrasive belt is not much introduced in the domestic literature, as a manufacturer of abrasive belt, we often feel that some users on the storage and use of abrasive belt knowledge is not very understanding. In order to better serve the user, so that the sand belt in the use of the best state, play the superiority of the sand belt grinding, the sand belt storage and use of some knowledge is introduced to you.
1 Storage of sanding belt
The storage of the sand belt is very important for the use of the sand belt, especially for the wide sand belt. Ideal storage conditions and reasonable storage methods can ensure that the sand belt is used in the best state.
1.1 Requirements on temperature and humidity
The sand belt should not be stored in places with large temperature and humidity changes, and the ideal temperature is: 18-220C; The ideal humidity is 40-65%, the temperature is too high will make the adhesive aging, reduce the service life of the sand belt. Synthetic fiber matrix belt (such as polyester cloth belt) is more sensitive to cold, can not be stored in cold warehouse.
Too high or too low humidity will cause certain deformation of the sand belt, and the deformation will reduce the bonding strength of the adhesive sand layer of the sand belt. In particular, excessive humidity has a serious impact on the sand belt. In addition to the water-resistant sand belt, the general sand belt after use by the tide, are prone to discounting, wrinkling and other phenomena, so that the sand belt scrap. In addition, the abrasive material is easily adhered to the surface of the abrasive belt during the grinding of the wet abrasive belt, which reduces the service life of the abrasive belt. High temperature and low humidity have great influence on the paper base sand belt, which makes the paper base sand belt brittle and easy to break and scrap during use.
1.2 Storage
Storage of sand belt warehouse should be cool, dry, ventilated; The sand belt should be placed on the goods shelf, not on the ground; The cargo shelf should be kept about 200-500mm away from the ground and walls, and avoid being close to the heat dissipation and drainage device. Do not open the packing case with unused belts. Do not pile heavy objects on the sand belt packing box to avoid creases and cracks in the sand belt.
2. Treatment of the sanding belt before use
The storage of the sand belt is important, but if the sand belt can not be properly treated before use, it will seriously affect its performance.
2.1 Suspension of sand belt
The sanding belt should be hung for at least 2-5 days before use, the purpose of which is to eliminate the curl caused by packaging.
Hang the unpacked sand belt on a 100-200mm diameter pipe or a dedicated sand belt support rack. The length of the pipe should be greater than the width of the sand belt, otherwise the sand belt is easy to fall off or produce a horn; The pipe should be horizontal, otherwise it is easy to damage the edge of the sand belt.
The ambient temperature and humidity of the hanging sand belt should meet the storage conditions of the sand belt, and the simplest way is to keep it dry in a sealed room with several 40W or 64W bulbs.
2.2 Appearance Check
Before using the suspended sand belt, the necessary appearance quality inspection should be done to see whether the sand belt joint is smooth and firm; Whether the surface of the sand belt has broken holes, sand balls, lack of sand, glue spots, wrinkles; Whether the edge of the sand belt is neat and has no cracks, if there are small cracks on the edge, it will not affect the use after cutting (cut into a circular arc).
3 Use of sanding belt
Only reasonable selection and correct use of the sand belt, and can correctly solve the various problems in the use of sand belt, play the advantages of sand belt grinding and the best grinding performance of the sand belt, in order to ensure the quality of the workpiece.
3.1 Application Rules
3.1.1 Reasonable selection of belt type
Different processing workpiece material, different processing workpiece shape selected by the sand belt model is not the same, the choice of sand belt model is mainly from the matrix material, abrasive material, binder type and sand belt joint mode of four aspects to choose. The knowledge about this aspect has been reported many times in the domestic literature, and this article will not be introduced here.
3.1.2 Select the appropriate granularity
Only by choosing the appropriate grit size can the surface quality of the workpiece be guaranteed and the service life of the grit belt be improved. If the selected sand belt size is too small, it can not ensure the surface quality of the workpiece; If the grain size of the selected sand belt is too large, the sand belt is easy to wrinkle and break during use, which reduces the service life of the sand belt.
3.1.3 Variety selection of multi-channel belt grinding process
If a workpiece adopts multiple belt grinding processes, the grain size of the belt used in the back can only skip two particle sizes compared with the front, only in this way can the high efficiency of belt grinding be played to ensure the shape and size of the workpiece and the surface quality of the workpiece.
3.1.4 Distribution of grinding amount in multiple belt grinding processes
Two processes: the distribution ratio of the front and back paths is 85/15;
Three processes: the distribution ratio of the front and back paths is 65/25/10;
Four processes: The distribution ratio of the front and back channels is 50/30/12/8
3.1.5 Choice of running direction of sand belt
When using the lap sand belt, the running direction of the sand belt should be consistent with the direction marked on the back of the sand belt, otherwise the sand belt is easy to break prematurely during use, and affect the surface quality of the machined workpiece. When using the butt sand belt, the running direction of the sand belt can be ignored.
3.2 Problems and solutions in abrasive belt grinding
Only when the abrasive particles of the sand belt are basically blunted and the grinding performance of the sand belt is lost is the normal end of the service life of the sand belt. However, in the actual abrasive belt grinding process due to the quality of the abrasive belt is not good, the quality of the workpiece is not good, there are problems in the equipment and improper operation, it will also cause the abrasive belt to be scrapped when the abrasive grain is not dull.
