1 inclusion

Causes: There are impurities in the dicing sheet and the bonding agent; impurities are mixed in the mixing and molding.
Prevention method: strengthen raw material inspection; strengthen operation to prevent impurities from entering.

2 uneven organization
Cause: the mixture is uneven, there is a binder point; the dextrin is oxidized iron oxide point, the filler is unevenly distributed; the foam of the pouring product is not completely eliminated, the suspension performance of the slurry is poor; the molding material is too dry, the aluminum abrasive cutting disc is separated or thick Separate the grain; the situation is off the sand; the cutting piece sticks to the bottom plate and the mold cover.
Prevention method: strictly according to the mixing process; the binder should be sieved into the pot, the dextrin can not be damp; the amount of starch is increased appropriately, and the water discharge speed after pouring is increased; the dry material is sieved, the dry explosive is mixed well, and the mixture is mixed. Master dry humidity; use paraffin oil and dry sand.

3 large grains

Cause: The fiber cutting disc Chinese supplier, the container was not cleaned, and the operation was improper.
Prevention methods: strengthen raw material inspection, clean up containers, mixing equipment, from fine to coarse mixing.

4 outer diameter crack

Cause: The cooling process is too fast; the temperature fluctuation in the firing is too large; the temperature in the middle and outer diameter of the firing is too high; the drying temperature is too fast; the molding is scratched, and the mold is removed.
Prevention method: Strictly control the temperature rise curve and dry temperature curve; check the mold to avoid blank scratches.

5 aperture crack

Cause: The heating rate is too fast, the heart stick is too bad, and it is shocked when the mold is unloaded.
Prevention method: Strictly grasp the temperature curve, check the heart stick, and avoid the earthquake when the mold is unloaded.

6 plane crack

Cause: The cooling rate is too fast, the temperature of the kiln is too high, the semi-finished product is shocked, and the number of semi-finished products is too high.
Prevention method: Strictly control the temperature and temperature curve of the kiln to avoid the shock of the unfinished product and control the height of the screw.

7 cups of bowl-shaped inner wall crack

Cause: The core radius of the mold is too small and the quality of the molding material is not good.
Prevention method: Finish the mold and keep the molding material at the proper temperature strength.

8 outer diameter layer

Cause: The quality of the mixture is not good; the mold is out of tolerance, and the mold sleeve is not correct when the mold is released.
Prevention method: to ensure the quality of the mixture, the over-different mold is strictly checked, and the unloading mold is kept vertical.

9 inner hole layer

Cause: The mandrel is unqualified, the molding compound has a short mixing time, and the adhesion is not good; when it is twisted, it is not scraped. The strength of the wet blank is not enough, the cover of the mold is not flat, and the side of the wet blank is first dropped and shocked.
Prevention method: Strengthen the mold inspection unqualified, timely replacement, especially the fine-grain molding materials should be mixed to ensure the molding needs; after the twisting, the middle of the mold should be scraped with a toothed scraper. Ensure the strength of the wet billet; the mold cover should be stable; it should be stable when placed.

10 uneven color

Cause: The suspended product of the cast product slurry is not good; the cutting piece sinks; the local firing temperature is too high, so that the two sides of the cutting piece are consistent.
Prevention method: Appropriately increase the starch to improve slurry uniformity; pay attention to maintain temperature uniformity.

11 hardness is not enough

Cause: The material distribution is uneven when the material is being spread; the upper and lower density are inconsistent when the type is pressed; the thickness of the horn is inconsistent, and the parallelism of the cutting piece is too poor; the coarse-grained cutting piece of the pouring cutting piece is too much water, the water absorption speed of the gypsum board is too fast; the thick cutting There is no twist in the middle of the film.
Prevention method: should be evenly scraped; master a secondary pressure; the thickness of the horn should be consistent, the accuracy of the tooling should be guaranteed; the water content of the pouring mud and the water absorption speed of the gypsum board should be mastered; the middle of the thick cutting piece should be properly twisted.

12 geometric accuracy is not good

Cause: The tool holder is skewed when the knife is fed; the quality of the knife bowl is not too fast; the knife thread is severely worn; the card is not stuck; the cutting piece is not strictly processed during processing; the thickness of the bottom pad is inconsistent; Horizontal; the distribution of iron sand in the chassis is uneven; the process is unreasonable; the precision of the equipment is not enough.
Prevention method: repair the machine tool; pay attention to the quality of the knife bowl; overhaul the machine tool; pay attention to the center; then tighten after tightening; select the bottom pad of the same thickness; repair the machine tool, keep the level of the grinding disc; pay attention to the uniform distribution of iron sand; formulate a reasonable process; Guaranteed accuracy.

13 concave and convex deformation

Cause: The bottom plate and the gland are deformed; the drying is too urgent; the kiln is not flat.
Prevention method: pay attention to timely replacement when checking for over-difference; pay attention to master the drying curve;

14 imbalance

The reason is as follows: the material is not evenly scraped; the low price disc for metal is not parallel when the pressing type is out of tolerance; the geometrical precision is not good during processing; the thickness of the horn is inconsistent, the spring is hard and soft, the turntable is not stable, and the car has collision.
Prevention method: The material should be evenly scraped; pay attention to check the accuracy of the mold, press and trolley; strictly operate and ensure the accuracy; the thickness of the horn is consistent, the spring should be checked frequently, pay attention to check the stability of the turntable, and control the speed of the car.

15 hardness does not match

Cause: The formula is incorrect; the ingredients are not correct; the forming single or pressed thickness does not meet the tolerance; the temperature does not conform to the process; the raw materials are unqualified.
Prevention method: Pay attention to the correctness of the formula; strengthen the operation, pay attention to the inspection; strengthen the operation, pay attention to the inspection; control the firing process and the kiln location; strengthen the inspection of raw materials entering the plant.

16 cutting sheet foaming

Causes: the binder has low refractoriness; the binder is added; the mismatching binder; the firing temperature is too high; the humectant is used in too much wrong amount; the kiln is not suitable.
Prevention method: adjust the ratio; the binding agent should be accurate; strengthen the inspection to prevent mismatching; control the firing curve; strictly increase the amount;

17 burst

Cause: The cooling rate during cooling is too fast; the temperature of the kiln is too high.
Prevention method: control the appropriate cooling rate; control the temperature of the kiln, not too high.

18 black hearts

Cause: The sand is too fine; the kiln is too dense; the atmosphere is not good; the ingredients are wrong; the formula is problematic; the temperature is high; the humectant is wrong.
Prevention method: generally use coarse sand; control density; should maintain oxidizing atmosphere; strictly check to avoid errors; adjust formula; control high temperature point and combustion chamber temperature; avoid mistakes.

19 coarse-grained cutting disc cover

Cause: The bond has low refractoriness and high fluidity; there are too many pieces per kiln.
Prevention method: Adjust the ratio of the binder, and then put it into production after verification; control the number of tablets per tablet.

20 is not enough size after burning

Cause: The blank is not enough; the temperature is high; the quality of the raw materials is not good; the number of kiln is more than the specified.
Prevention method: Appropriate increase of retention; control of temperature; strict inspection of incoming raw materials; strict process discipline.

21 turns of waste

Cause: The firing temperature is high or low; the mixing is uneven; the unbalanced grams are large; the binder is used incorrectly; the binder is mismatched.
Prevention methods: control temperature and firing location; strengthen mixing operation; improve balance performance; strengthen self-test to avoid errors.

22 iron spots

Cause: The quality of the raw materials is poor; after the equipment is overhauled, the cleaning is not good; the firing temperature is too high.
Prevention method: Strict inspection; after strict cleaning, remix; control the firing temperature.