CN102101168A - Method for cutting large-scale cast steel dead head - Google Patents

Abstract

The invention relates to the field of cast steel production, in particular to a method for cutting a large-scale cast steel dead head. The method is characterized in that: the dead head is cut in the cooling process of the poured cast, wherein the operating process comprises the following steps of: performing temperature monitoring on a cast after the cast is cast; when the cast is cooled to 150+/-50 DEG C above phase transition temperature, cutting the dead head; preserving heat of the dead head root and the whole cast and performing temperature monitoring continuously; when the temperature of the dead head root is cooled to be consistent with that of other parts and below the phase transition temperature, taking away the dead head; and preserving the heat of the cast continuously until the temperature required by the process and opening a box. The method has the advantages that: 1, the cooling speed of the cast is increased and the heat-preservation time is shortened, so the production capacity of the cast steel is improved; 2, after the dead head is cut, the cast is not required to enter a furnace to perform heat treatment at once, so the furnace-entering times are reduced and production efficiency is improved; 3, the lower crack of the dead head is reduced, so the damage to the cast per se is reduced; and 4, the quality of the cast steel is improved and the production cost is reduced.

Description

A kind of large-scale steel-casting rising head cutting method

Technical field

The present invention relates to the Steel Castings field, relate in particular to a kind of large-scale steel-casting rising head cutting method.

Background technology

The rising head of large-scale steel-casting is relatively all bigger, therefore must be fervent, and the rising head of especially large-scale steel alloy steel-casting all was to utilize the waste heat of coming out of the stove after the heat treating castings to cut generally in the past.According to the difference of castings material, structure, rising head size, cutting temperature generally will guarantee in certain temperature range, and the rising head cutting will be advanced the furnace treatment reason after finishing immediately; Otherwise foundry goods will crack defective, and tissue is produced very difficulty, low, the cost increase of production efficiency simultaneously.Along with the increase of foundry goods substance, casting pressing port also increases, according to existing method cutting casting pressing port, to working condition as: overhead traveling crane, heat-treatment furnace etc. can not satisfy cutting rising head after the heat treating castings require situation the time, some foundry goods can't be produced.

Summary of the invention

Purpose of the present invention provides a kind of large-scale steel-casting rising head cutting method, reduces crackle generation under the casting pressing port, enlarges the Steel Castings ability, improves the steel-casting quality.

For solving the problems of the technologies described above, technical scheme of the present invention is:

A kind of large-scale steel-casting rising head cutting method is characterized in that, cuts rising head in the intact cooling procedure of casting pouring, and its operating procedure is as follows:

1) behind casting pouring, foundry goods is carried out temperature monitoring;

2) more than being cooled to phase transition temperature, foundry goods 150 ± 50 ℃ the time, cuts rising head;

3) to rising head root and whole casting parts thermal insulation and proceed temperature monitoring;

4) when the rising head root temperature is cooled to consistent with other position temperature of foundry goods and is lower than phase transition temperature, rising head is taken away;

5) foundry goods continues to be incubated up to the technological requirement temperature unpacking.

Compared with prior art, the invention has the beneficial effects as follows: 1. accelerate because of the foundry goods cooling velocity, temperature retention time shortens, and has improved the production capacity of steel-casting; 2. need not go into the furnace treatment reason behind the cutting rising head at once, reduce and go into the heat number, improve production efficiency, improve the utilization rate of heat-treatment furnace; 3. crackle reduces under the rising head, and the environmental pollution when having reduced soldering and the injury of human body have reduced the infringement to the foundry goods body; 4. improve the steel-casting quality, reduced production cost.

The specific embodiment

Below in conjunction with embodiment the specific embodiment of the present invention is described further:

A kind of large-scale steel-casting rising head cutting method is cut rising head in the intact cooling procedure of casting pouring, its operating procedure is as follows:

1) behind casting pouring, foundry goods is carried out temperature monitoring;

2) be cooled to austenite to pearlite and more than the martensite transformation temperature 150 ± 50 ℃ the time when foundry goods, cut rising head;

3) rising head cutting is finished the back and is not taken away immediately, with sand or the continuation of other insulation material to rising head root and whole casting parts thermal insulation and proceed temperature monitoring;

4) when the rising head root temperature is cooled to consistent with other position temperature of foundry goods and is lower than phase transition temperature, rising head is taken away;

5) foundry goods being covered the continuation insulation unpacks up to the technological requirement temperature.

By taking the method, the foundry goods cooling velocity is accelerated, and temperature retention time shortens, and has improved the production capacity of steel-casting; Need not go into the furnace treatment reason behind the cutting rising head at once, reduce and go into the heat number, improve production efficiency, improve the utilization rate of heat-treatment furnace; Crackle reduces under the rising head, and the environmental pollution when having reduced soldering and the injury of human body have reduced the infringement to the foundry goods body; Improve the steel-casting quality, reduced production cost.

Claims (1)

1. a large-scale steel-casting rising head cutting method is characterized in that, cuts rising head in the intact cooling procedure of casting pouring, and its operating procedure is as follows:

1) behind casting pouring, foundry goods is carried out temperature monitoring;

2) more than being cooled to phase transition temperature, foundry goods 150 ± 50 ℃ the time, cuts rising head;

3) to rising head root and whole casting parts thermal insulation and proceed temperature monitoring;

4) when the rising head root temperature is cooled to consistent with other position temperature of foundry goods and is lower than phase transition temperature, rising head is taken away;

5) foundry goods continues to be incubated up to the technological requirement temperature unpacking.