What is the quality of the diamond grinding wheel

2020-09-17 1284

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 the key procedure;

2. Inclusion. Before and during 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 sieve number and frequency specified in the process;

4. Uneven organization, uneven hardness, and imbalance. Adjust the dryness and humidity of the mixture to ensure good formability. Perform spreading and scraping operations according to process requirements. According to the process requirements, use shims first to maintain the accuracy of the press; Uneven spreading and scraping during feeding, wet mixing, or agglomeration of materials, uneven feeding, mold wear, and severe leakage, requiring replacement of the mold;

5. Cracks in the formed billet.

6. The two end faces are not parallel. Maintain the accuracy of the press table and operate according to process regulations;

7. The surface is uneven. Maintain tooling equipment within the required accuracy range;

8. The molding hardness does not match. The first piece of pressing must be inspected, and no less than 30% of each batch of blank should be sampled. The weight of the weighing unit should be regularly checked and the pressure should be observed for any changes;

9. The bridge is uneven. Cooling should be uniform; The surface of the workpiece that is "warped" and does not have a flat surface is called a bridge ridge. This is caused by uneven cooling, resulting in inconsistent shrinkage of the parts or uneven base plates for furnace installation. 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 easy to produce bridge shaped waste products;

10. Blistering. Control temperature hardening according to the hardening curve of product specifications, and strictly control the quality of the mixing process; The molding temperature is too high or too low, and the temperature needs to be adjusted. The curing temperature is too high, and the curing furnace temperature is out of control. Binder mismatch; Local surface protrusion deformation or overall surface expansion of superhard grinding tools, with resin luster, and some with turtle shaped cracks.

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

12. Red Heart. The hardening furnace exhaust system needs to be unobstructed, and the hardening operation should be carried out according to the product specification's hardening curve, with correct control. For liquid resin blanks, porous or ceramic pads should be selected; The center of the superhard grinding tool appears red, causing uneven hardness and easy fracture of the grinding wheel.

13. Hardening hardness mismatch and rotational fracture. According to the correct temperature control operation according to the hardening curve, the hardening of powdered resin blanks requires covering or embedding sand. During loading, unloading, and transportation, the blanks should be protected from vibration. The fracture of superhard grinding tools during inspection rotation is caused by low bonding strength or cracks in the grinding tools.

14. During use, the cutting pieces are off the mesh. The quality of resin powder, resin solution, and mesh should be qualified, and the process formula should be reasonable, with basically no aforementioned problems. Some fracture areas have coarse abrasive particles, loose tissue, 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 size of the selected pad iron 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 handled carefully after forming and until hardening to ensure that the edges and edges of the workpiece are intact and avoid mechanical damage. Falling edges and corners are often caused by careless handling during furnace loading and transportation. Training should be strengthened for workers who are not proficient in operation to improve their skills. Resin grinding tools with low wet strength should be transferred or placed using the flip plate method, and cannot be directly moved by hand.

The article originates from:Diamond grinding wheelhttp://www.jm-nanhua.com