Lost foam casting process of high-manganese steel sieve plate

Abstract

The invention relates to a lost foam casting process, in particular to a lost foam casting process of a high-manganese steel sieve plate. The lost foam casting process comprises the following steps: 1, performing blank moulding; 2, preparing paint; 3, serially connecting moulds and blank moulds; 4, painting; 5, performing sand moulding; 6, smelting; 7, casting, performing shakeout and performing water toughing treatment. By the lost foam casting process, the top pouring time is shortest and the pouring speed is high, so that sand crushing can be easily prevented; the temperature fall is small, so that defects caused by insufficient pouring and a cold shut can be easily prevented; the product yield is high, and the sequential solidification and feeding effect is good; carbon defects of a cast product can be eliminated; small-batch pilot scale tests and mass production practices show that the one-time pass rate of the cast product reaches about 95%.

Description

technical field [0001] The invention relates to a lost foam casting process, in particular to a lost foam casting high manganese steel sieve plate process. Background technique [0002] Lost foam casting (also known as full mold casting) is made of foam plastic (EPS, STMMA or EPMMA) lost foam casting process polymer material to form a full mold with exactly the same structure and size as the part to be cast. After dipping and refractory After the coating (plays the role of strengthening, smoothing, and ventilation) and drying, it is buried in dry quartz sand and subjected to three-dimensional vibration modeling, and the casting mold sand box is poured with molten metal under negative pressure to make the polymer material model heated and vaporized It is a new casting method for castings produced by a new process of one-time molding casting formed after being extracted and replaced by liquid metal after cooling and solidification. [0003] There are many different names for ...

AI Technical Summary

Problems solved by technology

Because the method adopts the design and processing of the metal type, the cost is high and the processing allowance is large.

[0008] Application No. 201210301732.5 discloses a hammer crusher sieve plate production process, which discloses the use of lost foam casting, but does not describe the specific process steps in detail

[0009] The lost foam gating system of the high manganese steel liquid casting sieve plate is not well controlled, and the defective rate is very high. Because of the top casting, such as the straight, horizontal and inner runners connected under the sprue cup of the waiting tube, the runners are too large and too many. If the temperature of molten steel entering the cavity is too high and too fast, the cavity will be overheated, resulting in defects such as: sticky sand, chemical sticky sand, cracking of the coating, peeling off, causing sand swelling, scarring, bulging, fleshy, etc., collapse The sand and liquid steel in the cavity enter too fast, too violently, the impact force is too large, and the temperature is too high, which will cause the local sand mold to collapse and collapse, and the casting will be scrapped; The cross section of the runner is too small or too small, so that the speed of molten steel entering the inner cavity becomes slower and slower, and the time is too long, which causes the temperature to drop too much, so that the local white mold is completely clean and melted, resulting in defects: wrinkled skin, phosphorus accumulation , inner skin, sticky sand, molten steel, sand, white mold decomposition residual liquid, bright carbon and tar, are bonded together, difficult to clean, cannot be poured, lack of meat, heavy skin, slag inclusions, inclusions, air inclusions, etc.