Graphite mold for sand-coated molding and application of graphite mold
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A technology of sand-covered molding and graphite molding, which is used in molding machines, casting molding equipment, casting molds, etc., to reduce machining allowance, reduce thermal cracking, and improve quality.
Pending Publication Date: 2022-03-01
SHENYANG HYATON FOUNDRY MATERIAL
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[0005] The invention provides a graphite mold for sand-covered molding and its application, which is used to solve the environmental protection problems faced by the existing casting process and improve the appearance quality and internal quality of castings
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Embodiment 1
[0035] Graphite type (mounted)
[0036] Mix 85% of the graphite fillet with 15% soda glass, filled in the female mold, heated to 120 ° C, heat insulation for 60 min, thermally cured molding, and set the graphite shape.
[0037] According to the design requirements, the above graphite type is finished: 12 holes of the outer round whale φ10, one of the mouth of φ12 in the inner end of each hole, to ensure uniform exhaust gas of the sand sand layer, and the sand. Tightness.
[0038] The sand is hung in the surface of the sand, and the thickness of the sand is 15 ± 5 mm. Graphite types include: a, on graphite, B, and lower graphite type.
Embodiment 2
[0040] The graphite type of Example 1 was used to produce φ500 mm cast steel gear castings.
[0041] 1. Metal mold, according to the casting process, molding with cast iron. Metal molds include:
[0042] a, upper metal mold,
[0043] According to the design requirements, the upper metal mold is used in the upper metal mold, the extension is distributed into three main erades, 12 mm per width, 50 mm long, and the outer circle is 6, 10 mm per width, 15 mm long. Keep the shot, blowing channels, no short circuit, no dead angle, complete, uniformly hardened, surface jetting the molding agent, prevents the surface of the sand-bearing layer, so it is easy to demold.
[0044] B, lower metal mold. According to the design requirements, the lower metal mold is used in the lower metal mold, and the extension circle is distributed as the main emitter, 12 mm per width, 50 mm long, and is a helpless range, 10 mm per width, 15mm long. Keep the shot, blowing channels, no short circuit, no dead ang...
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Abstract
The invention belongs to the technical field of casting, and particularly relates to a graphite mold for sand-coated molding and application of the graphite mold. The method comprises the following steps: uniformly mixing graphite chips with an adhesive, filling a female mold with the mixture, tamping, heating to 110-180 DEG C, preserving heat for 40-60 minutes, and drawing after thermocuring molding, so as to obtain the graphite mold for sand-coated molding, and the graphite mold is applied to preparation of a graphite mold water-glass-coated sand casting mold. The graphite scraps are wide in source and low in price, the investment of a sand-coated molding production line is reduced by replacing an iron mold with a graphite mold, and the graphite mold is stable in performance after being heated. According to the sand-coated molding technology for composite blowing hardening of the sodium silicate-bonded sand, the over-blowing defect of the sodium silicate-bonded sand is avoided, the addition amount of the sodium silicate is low, the collapsibility is good, the strength is high, and the gas forming amount is small.
Description
Technical field [0001] The present invention belongs to the field of casting techniques, and in particular, a graphite type and its application for sandwrapping styling. Background technique [0002] China is a large foundation of casting, with a total output of castings in 2020. At present, the production of castings is mainly used with sand box sand castings, and there is a box casting process. There is an ester-hardening water glass self-hard sand process, CO2 hardened water glass sand process, resin self-hard sand process, film sand craft, etc. However, these conventional sand casting process methods are common characteristics in the actual production process. Production of sand trunk is high, and there is a high resource consumption, low performance, dust and harmful gas emissions cannot be controlled. . [0003] The iron-shaped sand-shaped styling process is different from the above-mentioned sand casting process, and the iron type is precision cast or molded with cast iron...
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