What is the quality of the diamond grinding wheel

2020-10-08 1711

1. The material particle size does not match, and the hardness does not match. Measures: Strictly calculate the ingredients according to the ingredient list, and review is a crucial procedure;

2. Inclusion. Before mixing, along with the mixing process, clean the tools and instruments as needed. Before adding ingredients, check for impurities in various raw materials;

3. Uneven mixing of materials. Mix according to the process requirements at the mixing time. Replace mixing machine components with excessive wear at any time. The powdered resin material should be sieved according to the screen number and frequency specified in the process rules;

4. Uneven arrangement, uneven hardness and imbalance. Adjust the dryness and humidity of the mixture to ensure excellent formability. Perform spreading and scraping operations according to process requirements. According to the process requirements, use pad iron first and adhere to the accuracy of the press; Uneven spreading and scraping during feeding, wet mixing, or agglomeration of materials, uneven feeding, mold wear, severe material leakage, and the need to replace the mold;

5. Cracks in the formed billet.

6. The two end faces are not parallel. Adhere to the precision of the press limit table and operate according to the process rules;

7. Uneven appearance. The protection of tooling equipment is within the required accuracy range;

8. The molding hardness does not match. Limit the first piece inspection to no less than 30 pieces per batch. Regularly check the weight of the weighing unit and investigate whether there is any change in pressure;

9. The bridge is uneven. Cooling should be uniform; The appearance of a product that is "warped" without a flat surface is called a bridge ridge. This is caused by uneven cooling, resulting in inconsistent shortening of the workpiece or uneven loading of the furnace pad. It mostly comes from thin grinding wheels and fine-grained thin products. When the cooling speed of the thin grinding wheel is too fast, it is prone to bridge corrugation and waste products;

10. Blistering. Control temperature hardening according to the product standard hardening curve, and strictly control the quality of the mixing process; The molding temperature is too high or too low, and it is necessary to adjust the temperature. The curing temperature is too high, and the curing furnace temperature is out of control. Binder mismatch; Part of the surface of the superhard grinding tool is protruding and deformed, or the entire surface is swollen, and it has a resin luster, some of which show turtle like cracks.

11. Deformation and collapse. Load the furnace and control the temperature according to the process rules. The ratio between fillers should be strictly controlled and adjusted, as there are interactions between fillers. Lack of pressure during the stacking of cutting pieces can cause deformation.

12. Red Heart. Requirements for hardening the exhaust system of the furnace, hardening operation according to the product standard hardening curve, correct operation, and selection of porous or ceramic pads for liquid resin blanks; Ultra hard grinding tools exhibit redness, resulting in uneven hardness of the grinding wheel and easy fracture.

13. Hardening hardness mismatch and rotational fracture. Properly control the temperature according to the hardening curve, cover or bury the powder resin blank during hardening, and prevent the blank from being shaken during loading, unloading, and transportation. The superhard grinding tool ruptures during inspection rotation due to low bonding strength or the formation of cracks in the grinding tool.

14. Cut off the mesh during the use process. The quality of resin powder, resin solution, and mesh should be qualified, and the process formula should be reasonable, without any of the above problems. Some cracks have coarse abrasive particles, loose arrangement, and lack of bonding agent, and the mesh cloth may detach with slight pulling. These defects are all related to improper manufacturing processes.

15. The hardness and strength of the finished product do not match.

16. The layer thickness is out of tolerance. This article is suitable for diamond resin grinding wheels, and the selection of sizing blocks is not appropriate. The substrate thickness is out of tolerance. The pressure replenishment time is too late, and it should be done within about 10 minutes;

17. Edge and corner dropping should be carefully handled after forming and until hardening to ensure that the edges and edges of the workpiece are intact and prevent mechanical damage. Falling edges and corners are often caused by careless handling during furnace loading and transportation. Workers who are not proficient in operation should strengthen training and improve their skills. Resin grinding tools with low wet strength should be transported or placed using the flip plate method, and cannot be directly moved by hand.

Article source: Diamond grinding wheelhttp://www.jm-nanhua.com