Development of this project is rolling acetabular wall Concentrator Crushing workshop Crushing System cone crusher one of the important parts in the actual working conditions, the workpiece bear a very, very strong, high-week meeting, repeatedly alternating stress role (impact, friction, compression, shear, etc.), its quality is good or bad, directly to the concentrator can engage in normal production and operation. To ensure the production of high-quality, long-life smashing acetabular wall, over the past few years, I plant scientists have conducted extensive research, technological breakthroughs and repeated Trial manufacture hard work. And in 2001 in the standard cone crusher plant capacity for industrial test. After four months and 15 days of the practical application of that I production plants rolling acetabular wall workpiece with aesthetic appearance, internal quality, impact resistance, friction, compression, shear and long life characteristics, completely satisfies this company Concentrator rolling on the acetabular wall workpiece application requirements.

1. Rolling Babbitt workpiece material analysis

According to the workpiece rolling acetabular wall in the actual working conditions under the stress state of service features (strong, high-impact, friction, compression, shear repeated), the combination of wear-resistant materials currently used domestic status quo, as a series of contrast analysis, we have chosen the test repeated in a strong blow, friction, compression, shear under working conditions with a strong potential (work-hardening capacity) for producing high-manganese steel rolling acetabular wall workpiece material.

1.1 rolling acetabular wall of the workpiece determine chemical composition

The wear resistance of high manganese steel steel by the chemical composition of the inclusions in steel, steel and carbide dissolution of segregation, steel grain size and quality of the pros and cons of casting decisions.

1.2 high manganese steel elements in the performance of their

C: high manganese steel castings wear resistance of the higher carbon content of not more wearable, but there is a limit, when the carbon content of> 1.4% after many cast carbide precipitation, water treatment and tough carbide to be completely dissolved austenite, so as to the solution space carbide reached saturation, not only do no good to wear, but also reduces the material strength and toughness, while serving fracture easily.

Si: silicon content of high and lower carbon solubility in austenite, carbide precipitation on the grain boundaries and increased mast, water treatment Ren, left in the grain boundary microstructure larger osteoporosis, but in order to completely eliminate the , the silicon content of steel, the best control in the 0.4-0.6%, silicon content of> 0.8% on the performance of high manganese steel had no significant impact.

Manganese: high manganese steel because of high manganese steel casting state organizations to Albright's legacy and carbide, the 1000 ℃ about heating water quenching treatment (usually Ren said water treatment). Carbide solution to the vast majority of austenitic steel organizations to single-phase and a small amount of austenite austenitic or carbide.

S: Because of high manganese steel, and can generate a large number of MnS discharged from the slag. Also, because the alkaline slag smelting, sulfur can be reduced to well below 0.03%. This low sulfur in the steel strength, toughness and wear resistance were not significantly affected.

P: Individual dissolved phosphorus in steel rarely, often Fe2p, Fe3P exists in the form of grain boundaries on the strength of the steel, toughness and wear resistance greatly reduced and high carbon content increased to a total of P precipitation in the form of crystal grain boundaries on. In order to ensure performance should be guided by the following relationship: C 11.27-2.761 × P =%%. To control the production of ≤ 0.08% phosphorus content: an important, complex, thick wall of ≤ 0.07%.

Based on the above analysis, the test identified for the production of rolling acetabular wall workpiece high manganese steel chemical composition of ZGMnl3-3, that is 0.9-1.3% ,11.0 C-14 .0% Mn ,0.3-0 .8% Si, S ≤ 0.05% P ≤ 0.08%.

2. Casting Process: Figure 1 shows the casting process.



Process Design 2.1 points
(1) large vehicle plate molding process: According to Rolling acetabular wall workpiece size of the outer contour (φ2360 × φ1410.1 × 615.5) Revolving, a large vehicle design process modeling plate to the middle of sprue, with four double-decker launch the runner into molten iron, four top BHF riser feeding and the new multi-factor control Casting Process.
The casting process to form equiaxed, eliminating columnar crystals. The molding process by casting casting a pass rate of more than 98%.

3. Melting and casting process

(1) the smelting process in the electric arc furnace and 3 T, metal charge for the high manganese steel liner back to Burden, 80% Mn-Fe, 75% Fe-Si alloy for the addition of elements inserted aluminum end deoxy. Smelting to ensure high quality of high manganese steel. Melting temperature requirements than 1500 ℃.
(2) the ingredients, feeding sequence and time, temperature control, Front processing, such as the pouring of me have to be accurate, carried out in strict accordance with the rules.
(3) melting strictly feeding order, according to the technical requirements of good control (of oxidation, reduction period) smelting quality, melting temperature requirements than 1500 ℃.
(4) casting requested Cleaner clean, and suitable for fast pouring, pouring temperature requirements than 1480 ℃.

4. Heat Treatment Process:

Will be cleared of the acetabular wall smashed into the workpiece as required heat treatment furnace, as shown in Figure 2 by the heat treatment specifications heat treatment.


Process points: 1 hour heated to 300-400 ℃, and then click 50-80 ℃ hourly rate of warming up to 1000-1050 ℃, so that a fully austenitic high manganese steel, insulation 2-3 hours, and then be quenched Ren water into the water to deal with a total processing time is 13 to 14 hours.

5. Rolling acetabular wall workpiece industrial test

Test in the standard cone crusher Concentrator conducted. After four months and 15 days of the practical application of that I plant selenium acetabular wall workpiece (compared with the purchase of) with the following notable features: (1) smooth surface, non-viscous sand, coarse, porosity, shrinkage, etc. Casting defects. (2) intrinsic high-quality, has good anti-week, high-impact loading, friction, compression, shear capabilities. (3) life than similar products purchased.

6. Conclusion:

(1) a reasonable choice of materials, advanced casting process, and the faithful and reliable control measures is to produce high-quality rolling acetabular wall of the key parts.
(2) heat treatment process was the improvement of impact resistance, friction, compression and shear loads, such as alternating the role of acetabular wall rolling a reliable guarantee of the workpiece.
(3) the practical application of scientific research products by the year reached 350,000 yuan cost savings Concentrator good effect.