Bucket Tooth Water Glass Investment Casting
The outer chilled iron should be covered with a certain thickness of molding sand to prevent the generation of transgranular structure. The thickness of the outer chilled iron sand coating is generally about 10mm.
Item | Bucket tooth water glass investment casting |
Production Process | Lost wax casting process of water glass |
Mold material | low temperature wax |
Formwork | Water glass, quartz sand |
Process characteristics | Cast alloys with complex shapes, difficult to forge, weld and cut, reduce machining allowances and reduce costs. |
Casting tolerance range | CT7 - CT9 |
Product weight range | 0.05kgs-200kgs |
Surface finish | RA12.5 |
Type of casting material | Carbon steel, alloy steel, gray iron, ductile iron, etc. |
Common materials | ASTM, SAE, AISI, DIN, BS, JIS, NF, EN, AAS, ISO |
After more than ten years of precipitation, Qinhuangdao Zhongwei Precision Machinery Co., Ltd. has rich production experience in water glass lost wax precision casting, lost foam precision casting, silica sol precision casting, and shell sand casting.
Product Description
Basic situation of Bucket tooth water glass investment casting
1. Implementation standards: The company strictly implements ISO9001 & TS 16949 certification.
2. Product material standards: ISO, GB, ASTM, SAE, ISO, EN, DIN, JIS, BS
3. Main processes: sand casting, silica sol investment casting, water glass investment casting,shell casting,deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.
4. Available materials:
High manganese steel, high chromium steel, high nickel steel, carbon steel, alloy steel, stainless steel, gray iron, cast iron, cast steel, cast aluminum, cast copper, etc. can be customized according to customer requirements.
Production Process
Take ZGMn13CrMo high manganese steel bucket tooth casting process as an example:
1 shape:
1.1 Use water glass sand and brush magnesia powder paint on the surface twice.
1.2 The outer chilled iron should be covered with a certain thickness of molding sand to prevent the generation of transgranular structure. The thickness of the outer chilled iron sand coating is generally about 10mm.
1.3 Adopt thermal insulation riser,
2 Smelting:
2.1 Requirements chemical composition: (%)
Element | C | Si | Mn | Cr | Mo | S | P |
Content | 0.8-1.05 | 0.30-1.00 | 12.0-14.0 | 0.30-0.75 | 0.80-1.20 | ≤0.040 | ≤0.070 |
2.2 Controlled chemical composition: (%)
Element | C | Si | Mn | Cr | Mo | S | P |
Content | 0.8-1.05 | 0.40-0.60 | 12.0-14.0 | 0.30-0.75 | 0.80-1.20 | ≤0.040 | ≤0.070 |
C:0.8-1.05 Si:0.40-0.6 Mn:12.0-14.0 Cr0.30-0.75 Mo0.80-1.20:≦0.040 P;≦0.070 RE:0.3
2.3 When the tapping temperature of high manganese steel reaches 1500-1520 °C, that is, when there is brownish yellow smoke on the surface of the molten steel, it means that the tapping temperature has been reached, and it should be tapped immediately.
2.4 Adding an appropriate amount of rare earth elements can prevent grain growth. Add rare earth elements in the pouring bag before pouring, and the amount added is
0.01%/t calculation, it is not necessary to add aluminum block. The pouring ladle must not have residual molten steel before the next ladle.
2.5 The addition amount of the return material should not exceed 25%-40%.
2.6 Alloying sequence: ferromolybdenum - ferrochromium - ferromanganese - ferrosilicon - rare earth ferrosilicon
3 pouring:
3.1 High temperature casting will cause coarse grains and columnar crystals. If the pouring temperature is too high, the
Wear now. Coarse grains and columnar grains will reduce the wear resistance of high manganese steel.
Weave refinement. The pouring temperature is generally controlled at 1420-1440 °C.
3.2 After pouring from the gate to the riser and rising to 1/3 of its height, pour from the riser until the riser is full, and after pouring the second
After forming, point pouring the former type riser.
3.2 Pour the riser with hot molten steel.
3.3 Pouring speed: 20-30S
4 Clean up:
4.1 In the sand cleaning and hoisting, as few collisions as possible, hammering and high-altitude landing are strictly prohibited, and watering is strictly prohibited to prevent the castings from breaking due to stress and chilling.
4.2 Strictly control the unpacking time, and the castings shall not be left in the hall after unpacking. Packing time is after 16h.
4.3 Gas cutting is prohibited before the heat treatment of the pouring riser.
4.4 Before the castings are heat treated in the furnace, mainly clean up the seams and sticky sand.
5 Heat treatment:
5.1 After the casting is kept warm, it shall not exceed 1 minute from the time it is quenched into the water, and the temperature of the casting shall not be lower than 1000 ℃ when entering the water.
5.2 The water temperature of the casting is lower than or equal to 30℃, and the water temperature in the whole process of quenching shall not exceed 50℃
5.3 Quenching castings must be circulated in water and quenched in water for 15-20min.
Post Casting Process
1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering
2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;
3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.
Moulds and Inspection Fixtures
1. Mold service life: usually semi-permanent. (except for lost foam)
2. Mold delivery time: 10-25 days, (according to product structure and product size).
3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.
Quality Control
1. Quality control: the defective rate is less than 0.1%.
2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements
3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;
4. Provide after-sales service.
5. The quality can be traced back.
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