CN103567252A - Thick-wall copper pipe production process - Google Patents

Abstract

The present invention discloses a thick-wall copper pipe production process, which comprises: 1, forging and stamping, wherein a furnace temperature is increased to 850-900 DEG C, a cooper ingot is forged and stamped, and thermal insulation is performed for 2-7 h; 2, reverse extrusion, wherein the copper ingot is subjected to position limitation by using an outer mold, the cooper rod is subjected to reverse extrusion through an inner mold to form a cooper pipe having the bottom, and the extruded cooper pipe is cooled to achieve a room temperature; and 3, cold extrusion, wherein the cooper pipe is subjected to cold extrusion to stretch so as to achieve the required size, and thermal insulation is performed for 3-4 h. According to the present invention, the manufacturing process is clear, the temperature and other parameters are reasonably controlled so as to produce the thick-wall cooper pipe meeting requirements by using the simple and conventional production process, and the quality is good.

Description

The manufacture craft of heavy wall copper pipe

Technical field

The present invention relates to a kind of manufacture craft of crystallizer copper pipe, particularly a kind of manufacture craft of heavy wall copper pipe.

Background technology

Casting process is that molten steel is injected in crystallizer, obtains continuously the process of strand, and it is the intermediate link that connects refining steel and rolled steel, is the important component part of STEELMAKING PRODUCTION.Crystallizer is the important component part of smeltery's conticaster, and crystallizer copper pipe is the vitals of crystallizer.Due to the high-temperature molten steel crystallizer copper pipe of directly flowing through, for making continuous casting operation process stable, support equipment and operator safety, just require crystallizer copper pipe to have good high temperature resistant, wear-resistant and decay resistance again.In order to improve the cooling effect of crystallizer, can consider to offer a plurality of grooves at copper pipe outer surface, Cooling Water flows through, and this just must need the wall thickness of copper pipe to increase.The wall thickness of existing copper pipe is generally 25 millimeters or 30 millimeters, the technique that such thickness cannot be slotted at all in rear processing, once and wall thickness is increased to more than 57 millimeters, while being even 70 millimeters, because wall thickness increases, when carrying out backward extrusion technology step, easily there is cracking in copper ingot, causes scrapping.

Summary of the invention

The object of the invention is to solve the defect that prior art exists, providing a kind of does not have specific (special) requirements to production equipment, can produce the manufacture craft of high-quality heavy wall copper pipe.

The technical scheme that realizes the object of the invention is a kind of manufacture craft of heavy wall copper pipe, comprises the following steps:

1. forging and stamping: furnace temperature is elevated to 850 ~ 900 ℃, and copper ingot is forged into copper rod, is then incubated 6 ~ 7 hours;

2. backward extrusion: copper ingot is spacing with external mold, by internal mold, copper rod is carried out to the copper pipe that backward extrusion forms band bottom, then the copper pipe squeezing out is cooled to normal temperature;

3. cold extrusion: copper pipe is elongated to the size requiring through cold extrusion, be incubated 3 ~ 4 hours.

Described the 3. the cold extrusion in step adopt repeatedly cold-stamped technique, be specially: 5 ~ 6 millimeters of the every minimizings of the monolateral wall thickness of copper pipe, once, temperature is 600 ~ 650 ℃ in tempering, until copper pipe wall thickness reaches requirement; During aforementioned each cold extrusion, calculate as requested required dimension of inner and outer diameters, and guarantee each cold-stamped precision by the mode that correspondence is changed inside and outside mould.

Adopted after technique scheme, the present invention has following useful effect: (1) process for making of the present invention is clear, by the isoparametric reasonable control of temperature, can go out by simple, habitual explained hereafter satisfactory heavy wall copper pipe, and quality is very good.

(2) because the more general copper pipe of heavy wall copper pipe tube wall is thick a lot, if adopt common cold-extrusion technology to carry out disposable extruding, likely can be long because of the time of required extruding, copper rod cooling is fast, cause easily occurring cracking, and be not easy control dynamics and speed guarantees once to push and put in place, and the present invention is when carrying out cold extrusion, adopt repeatedly the form of cold-extruded, just can solve this problem, control the time of each backward extrusion, make its cooling slow, thereby stopped copper pipe problem of Cracking.

The specific embodiment

The manufacture craft of a kind of heavy wall copper pipe of the present embodiment, comprises the following steps:

1. forging and stamping: furnace temperature is elevated to 850 ~ 900 ℃, and copper ingot is forged into copper rod, is then incubated 6 ~ 7 hours;

2. backward extrusion: copper ingot is spacing with external mold, by internal mold, copper rod is carried out to the copper pipe that backward extrusion forms band bottom, then the copper pipe squeezing out is cooled to normal temperature;

3. cold extrusion: copper pipe is elongated to the size requiring through cold extrusion, be incubated 3 ~ 4 hours.Cold extrusion adopts repeatedly cold-stamped technique, is specially: 5 ~ 6 millimeters of the every minimizings of the monolateral wall thickness of copper pipe, and once, temperature is 600 ~ 650 ℃ in tempering, until copper pipe wall thickness reaches requirement; During aforementioned each cold extrusion, calculate as requested required dimension of inner and outer diameters, and guarantee each cold-stamped precision by the mode that correspondence is changed inside and outside mould.Cold extrusion, is commonly called as cold moulding, and the copper pipe that stretches under normal temperature is to improve the technique of the hardness of copper pipe.

The thick-walled pipe that the model of take is 800 is example, the thick-walled pipe that so-called model is 800, refer to that internal diameter is roughly the copper pipe of 800 millimeters, the concrete internal diameter size of the finished product that final production is definite is 817 millimeters, wall thickness is 70 millimeters, external diameter is 957 millimeters, during fabrication, selecting diameter is the copper ingot of 380 millimeters, forge and press to diameter be 1001 millimeters, in backward extrusion step, with internal model control internal diameter, reach required 817 millimeters of finished product, external diameter is still 1001 millimeters, by repeatedly cold extrusion, final reduced outside diameter and wall thickness, make to reach requirement.

Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (2)

1. a manufacture craft for heavy wall copper pipe, is characterized in that comprising the following steps:

1. forging and stamping: furnace temperature is elevated to 850 ~ 900 ℃, and copper ingot is forged into copper rod, is then incubated 6 ~ 7 hours;

2. backward extrusion: copper ingot is spacing with external mold, by internal mold, copper rod is carried out to the copper pipe that backward extrusion forms band bottom, then the copper pipe squeezing out is cooled to normal temperature;

3. cold extrusion: copper pipe is elongated to the size requiring through cold extrusion, be incubated 3 ~ 4 hours.

2. the manufacture craft of heavy wall copper pipe according to claim 1, is characterized in that:

Described the 3. the cold extrusion in step adopt repeatedly cold-stamped technique, be specially: 5 ~ 6 millimeters of the every minimizings of the monolateral wall thickness of copper pipe, once, temperature is 600 ~ 650 ℃ in tempering, until copper pipe wall thickness reaches requirement; During aforementioned each cold extrusion, calculate as requested required dimension of inner and outer diameters, and guarantee each cold-stamped precision by the mode that correspondence is changed inside and outside mould.