Casting material

Refractories for Casting material.

Technical requirements for refractory materials for die casting:

Preparations before use of refractory materials for die casting:

(1) When selecting bricks, any bricks with defects such as cracks, trachoma, fire moles, missing edges, missing corners, distortions, uneven end faces, sub-port defects, looseness, and dimensional tolerances exceeding the standard are not used.

(2) For brushing the bricks, all the working surfaces of the bricks that meet the standard requirements must be cleaned with a steel brush to remove the ash. Then according to the variety, the date code is placed in the baking kiln.

(3) Baking. Bricks for die casting must be baked in a baking kiln at 80-160°C for 48 hours, and the moisture content in the bricks should be less than or equal to 0.3% before use.

(4) Hooping, the funnel brick C2 should be tightened with iron hoop before use to prevent it from bursting when pouring steel.

The masonry method of the die-cast bottom plate:

(1) Dry laying method, no mud is applied to the interface of the soup road brick, and the reduction of water is very beneficial to the quality of the steel ingot. However, the quality of brick use and the technical quality of masonry operators are strictly required, and the operation must be careful and careful.

(2) In the wet laying method, the joints of the soup road bricks are smeared with refractory mortar to prevent steel from running away at the joints. The mud can not run into the working surface of the soup road, otherwise the inclusions brought into the ingot will increase.

The masonry procedure of the die-cast bottom:

(1) Clean up the residual steel residue in the groove of the bottom plate, and check whether the bottom plate is normal.

(2) Lay the center bricks 3 to 6 first, so that the surface of the brick is flush with the bottom plate and aligned with the 6 flow steel channels. Then fix the center brick, which cannot be skewed and cannot be built high.

(3) Lay the flow steel bricks on both sides of the center brick to ensure that the position of the center brick does not move. Then build the soup road bricks one by one, and plug the tail of each soup road with broken bricks to prevent loosening.

(4) The flow steel should be tested first and then built, and then built after the test. The joint mud should be spread evenly, and the mud should not be squeezed into the soup channel.

(5) After the masonry is completed, from the back to the front to the gap between the bottom plate and the soup channel, fill the sieved dry fire brick particles and then embed them with mud, press down and compact, and then blow the bottom plate and check it once.