Sand mixing process for molding clay green sand

A technology of green sand and moulding sand, which is applied to manufacturing tools, machinery for cleaning/processing of moulding materials, and casting moulding equipment, etc., can solve problems such as control and unsatisfactory use effect, improve moulding quality and save production costs , to ensure the effect of comprehensive performance

Active Publication Date: 2013-10-09
上海圣德曼铸造海安有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in actual production, we often lose sight o

Method used

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  • Sand mixing process for molding clay green sand
  • Sand mixing process for molding clay green sand
  • Sand mixing process for molding clay green sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put 2501Kg of old sand with a water content of 1.77% and a temperature of 32°C, without adding new sand, 18.3Kg of bentonite, and 4.8Kg of coal powder, into the Erich RV23 rotor sand mixer, and dry mix for 10 seconds. Add 36.4Kg of water while wet mixing for 95 seconds.

[0028] (2) The testing data of molding sand are shown in Table 2 and Table 3.

[0029] Table 2 Molding sand testing data of Erich RV23 sand mixer

[0030]

[0031] Table 3 Molding sand testing data of Erich RV23 sand mixer

[0032]

[0033] (3) The mold sand that has been mixed and milled and passed the inspection is used on the HWS line for the molding and casting of the exhaust pipe, and the casting sand and air hole rejection rate is low. Since the exhaust pipe uses more cores, and when mixing the molding sand, the addition of 1.2% new sand is changed to no new sand, which not only reduces the amount of bentonite added, but also reduces the amount of pollutant discharge.

Embodiment 2

[0035] (1) Put 2402Kg of old sand, 25.1Kg of new sand, 23.7Kg of bentonite, and 9.8Kg of coal powder with a moisture content of 2.04% and a temperature of 20.8°C into the Erich RV24 rotor sand mixer, and dry mix for 15 seconds. Add 32.8Kg of water while wet mixing for 100 seconds.

[0036] (2) The testing data of molding sand are shown in Table 4 and Table 5.

[0037] Table 4 Molding sand testing data of Erich RV24 sand mixer

[0038]

[0039] Table 5 Molding sand testing data of Erich RV24 sand mixer

[0040]

[0041] (3) The molding sand that has been mixed and rolled and passed the inspection is used for the molding and casting of the brake caliper shell on the Loramendi line. Due to the high strength of the molding sand, suitable mud content, good plasticity and toughness, the following bentonite / water is suitable , The compaction rate / water is moderate, the sand mold cracks after pouring 4 cases, and delays to 11 cases after pouring, and the crack width decreases....

Embodiment 3

[0043] (1) Put 1802Kg of old sand, 10Kg of new sand, 20.2Kg of bentonite, and 4.8Kg of coal powder with a water content of 1.5% and a temperature of 27.6°C into the Erich DEV22 rotor sand mixer, and dry mix for 15 seconds. Add 28.1Kg of water while wet mixing for 120 seconds.

[0044] (2) The testing data of molding sand are shown in Table 6 and Table 7.

[0045] Table 6 Molding sand performance test data of Erich DEV22 sand mixer

[0046]

[0047] Table 7. Molding sand performance test data of Erich DEV22 sand mixer

[0048]

[0049] (3) The molding sand that has been mixed and milled and passed the inspection is used for the molding and casting of bearing caps on the DISA line. The rejection rate of casting sand and pores has decreased by about 30% compared with the same period (accounting for the total rejection rate).

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Abstract

The invention provides a sand mixing process for molding clay green sand. The process comprises the following steps of: (1) proportioning the following materials in parts by weight: 97-100 parts of old sand, 0-3 parts of fresh sand, 0.8-1.2 parts of bentonite, and 0.2-0.6 part of pulverized coal; (2) orderly putting the proportioned materials into a sand mixer for mixing for 8-20 seconds in a drying manner; and then adding wet sand which is 0.8-2% of total mass of the sand for mixing for 80-130 seconds; and (3) detecting the mixed casting sand, wherein the casting sand accords with the following indexes: the compaction rate/moisture is 10.0-11.5; the effective bentonite/moisture is 2.1-2.5; the 140-mesh retention amount is 6.0-9.0%; and the content of triple-screen which is less than 200 meshes is 2.8-3.5%. By adopting the sand mixing process, the combination property of the casting sand is ensured; and the purposes of improving the drawing quality, reducing sand shakeout of a casting and the blowhole rejection rate, delaying and removing cracks of a sand mold, and the like are achieved.

Description

technical field [0001] The invention relates to molding sand casting, in particular to a molding sand mixing process for producing medium and small-sized castings on a clay green sand high-pressure molding line. Background technique [0002] For clay green sand molding, the quality of the molding sand has a fundamental impact on the quality of the final casting, and it can also be said to be the mother of the quality of the casting. [0003] For a long time, the quality of molding sand molding has fluctuated greatly, which is not ideal. The existence of this situation is not only related to the large variety of castings produced every day, the large change in the ratio of sand to iron, and the difficulty in achieving accurate control, but also to the aging of the sand mixer in the sand processing equipment, the power decline, and the small old sand storage. , Low water content of old sand, insufficient recovery of bentonite, high temperature of old sand, and our inconsisten...

Claims

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Application Information

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IPC IPC(8): B22C5/04
Inventor 王易千龚华林田迎新张建兵李继荣
Owner 上海圣德曼铸造海安有限公司
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