Types of refractory materials for mold casting:
Now there are 6 ingot for 1 bottom plate, and the varieties of resistant materials used in the mold casting system are :(1) funnel brick C2, 1 block.(2) medium injection tube C6, 9 pieces.(3) 3 ~ 61 central bricks.(4) flow steel bricks 9E, 12 pieces.(5) flow steel bricks 9B, 6 pieces.(6) tail bricks 10D, 6 pieces.(7) die base C51, 6 pieces.
Preparation for the use of refractory materials for mold casting:
(1) in selecting bricks, any bricks with defects such as cracks, sand holes, fire moles, missing edges, missing angles, distortion, unevenness at the end, sub-mouth defects, loose, dimensional tolerance exceeding the standard shall not be used.
(2) to brush the brick, where the working surface of the brick meets the standard requirements, it must be cleaned with a steel brush to remove the ash.Then put them in the baking kiln by variety and date.
(3) baking, casting brick must be baked in 80 ~ 160℃ baking kiln for 48 hours, the brick contains water ≤0.3% can be used.
(4) hoop, funnel brick C2 should be tightened iron hoop before use to prevent cracking during pouring.
Casting method of bottom plate:
(1) dry laying method, tang road brick interface does not apply mud material, reduce water content is very beneficial to the quality of ingot.But to brick use quality, to lay bricks the operator technical quality requirements are strict, the operation must be careful.
(2) wet laying method, the joint of tang road brick is laid with refractory mud to prevent steel running at the joints.Mud should not run into the working face, otherwise it will increase the inclusion in the ingot.
Laying procedure of die casting bottom:
(1) clean the residual steel residue in the bottom plate groove and check whether the bottom plate is normal.
(2) lay the center brick 3 ~ 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, can not skew, can not build high.
(3) lay the flowing steel bricks opposite the center brick again to ensure that the position of the center brick does not move.Each runner is then lined with bricks. The end of each runner is plugged with broken bricks to prevent loosening.
(4) flow steel should be tested before laying, and then laid after a good test.Seam mud shall be daubed evenly, mud shall not be squeezed into the soup passage.
(5) after laying bricks, fill the gap between the bottom plate and the soup passage from back to front, and then inlay the screened dry firebrick particles with mud, press tightly and compactly, and finally blow off the bottom plate for inspection.
Basic principles of cast bottom slab lining
One flat (flat brick and bottom plate), two solid (sand fill), three strict (brick joint strict), four tight (sand tie tight), five clean (floor blowing clean)
Laying procedure of middle pipe:
(1) first lay the pipe in the middle section of the 3 ~ 6 faces of the center brick, and it shall be placed firmly and perpendicular to the center brick.
(2) then put 6 ~ 7 sections, successively perpendicular cannot tilt.Note that the male and female must be identical between each section.
(3) lift and place the middle casting pipe gate casting, adjust the gap of the middle casting pipe with manual crowbar, and add middle casting pipe brick and funnel brick.
(4) cover the iron plate with funnel brick, fill the gap of the gate with sand, and prevent the middle injection from breaking and running steel.
(5) use compressed air to purge the sand particles in the middle injection tube and soup passage.
Causes of steel floor running accident:
(1) soup road brick joints lax run steel.
(2) the tangdao brick is higher than the plane of the bottom plate and fractured by ingot mold and gate casting.
(3) tang road brick rapid thermal difference blasting run steel.
(4) loose interface between bottom brick and tail brick, deformation of bottom surface of ingot mold.
(5) the middle injection pipe interface is not strict, burst, hot sand filling is not running steel.
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