CN203389984U

CN203389984U - Special equipment for producing high-rigidity cold-drawn steel pipe

Info

Publication number: CN203389984U
Application number: CN201320468353.5U
Authority: CN
Inventors: 许卫东
Original assignee: WUXI DAJIN HIGH-PRECISION COLD-DRAWN STEEL TUBE Co Ltd
Current assignee: WUXI DAJIN HIGH-PRECISION COLD-DRAWN STEEL TUBE Co Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-01-15
Anticipated expiration: 2023-07-30

Abstract

The utility model provides special equipment for producing a high-rigidity cold-drawn steel pipe. The special equipment comprises an annular heating furnace, a perforating machine, a de-stressing annealing furnace, a pipe mill, a heating furnace, an acid washing device, a phosphorization device, a saponification device, a cold-drawing machine and an annealing furnace, wherein the annular heating furnace is connected with the perforating machine, the de-stressing annealing furnace, the pipe mill, the heating furnace, the acid washing device, the phosphorization device, the saponification device, the cold-drawing machine and the annealing furnace in sequence. According to the special equipment, a produced product has the characteristics of high rigidity and good surface performance; the product can be produced in a large scale, the production efficiency is high and the quality of the product is reliable.

Description

A kind of special equipment of producing high rigidity cold drawing steel tube

Technical field

The utility model belongs to steel pipe preparing technical field, is specifically related to a kind of special equipment of producing high rigidity cold drawing steel tube.

Background technology

As the cold process of the steel for mechanical structure pipes such as carbon steel, alloy steel or stainless steel, known have the drawing processing method of being undertaken by drawbench and the rolling processing method of being undertaken by Pierre's form milling train.Wherein, the drawing processing method of being undertaken by drawbench, compares with the rolling processing method of being undertaken by Pierre's form bundle machine, can manufacture expeditiously cold working steel pipe, but product hardness can not be guaranteed.In recent years, as the steel for mechanical structure pipe with the various frame for movement members headed by automobile, from the viewpoint of lightweight of structural elements etc., require high rigidity, therefore, owing to requiring high rigidity, need to after cold-drawn, in the atmosphere of low temperature, adjust in stove and anneal, when implementing this annealing, by promote remaining lubricating oil thermal decomposition, lubricating oil is fully volatilized remove etc. to seek to reduce annealing residue, this becomes the problem of new needs solution.

Summary of the invention

The utility model, for the problems referred to above, provides a kind of special equipment of producing high rigidity cold drawing steel tube, and the steel pipe that this special equipment is produced has the advantages that hardness is high, surface property is good.

The technical solution of the utility model is: a kind of special equipment of producing high rigidity cold drawing steel tube, comprise rotary heating furnace, punch, stress relief annealing stove, pipe mill, heating furnace, acid dip pickle, phosphating plant, device for saponifying, drawbench, annealing furnace, it is characterized in that: described rotary heating furnace be linked in sequence punch, stress relief annealing stove, pipe mill, heating furnace, acid dip pickle, phosphating plant, device for saponifying, drawbench, annealing furnace.

The steel pipe that the utility model is produced has the advantages that hardness is high, surface property is good.

Accompanying drawing explanation

Fig. 1 is apparatus structure schematic diagram of the present utility model.

In figure, 1. rotary heating furnace, 2. punch, 3. stress relief annealing stove, 4. pipe mill, 5. heating furnace, 6. acid dip pickle, 7. phosphating plant, 8. device for saponifying, 9. drawbench, 10. annealing furnace.

The specific embodiment:

Below in conjunction with accompanying drawing, the utility model is further described.

A kind of special equipment of producing high rigidity cold drawing steel tube in the utility model, comprise rotary heating furnace 1, punch 2, stress relief annealing stove 3, pipe mill 4, heating furnace 5, acid dip pickle 6, phosphating plant 7, device for saponifying 8, drawbench 9, annealing furnace 10, it is characterized in that: described rotary heating furnace 1 be linked in sequence punch 2, stress relief annealing stove 3, pipe mill 4, heating furnace 5, acid dip pickle 6, phosphating plant 7, device for saponifying 8, drawbench 9, annealing furnace 10.

In the utility model, the effect of rotary heating furnace 1 is that pipe is heated in annular furnace, thereby guarantee that heating of pipe blank is even, the effect of punch 2 is that heat pipe base is bored a hole through punch, and order control punch eccentricity, pipe is carried out to visualize, use the burr of removing pipe surface, stick up skin, if pipe surface occurs or exists to be significantly the obvious pits of naked eyes, run over and injure and crackle, should reject, avoid flowing into subsequent processing, to control pipe surface quality, the effect of stress relief annealing stove 3 is that pipe is introduced in continuous annealing furnace and annealed, obtain the annealing pipe that annealing hardness (HV) is 210, the effect of pipe mill 4 is that annealing pipe introducing pipe mill is cold rolling, obtain rolled pipe, the effect of heating furnace 5 is that rolled pipe is introduced to heating and insulation in heating furnace, after cooling with stove, come out of the stove, obtain the pipe of annealing, object is to guarantee the intensity of steel pipe, the effect of acid dip pickle 6 is that annealing pipe is carried out to pickling, remove surperficial scale, the effect of phosphating plant 7 is that the chemistry that forms trbasic zinc phosphate on the surface of pipe generates overlay film, the effect of device for saponifying 8 is on overlay film, to form the lubricating film coateds such as metallic soap, the effect of drawbench 9 is to treat that cold-drawn pipe carries out cold-drawn processing, obtain drawn tube, the effect of annealing furnace 10 is drawn tube to be introduced to annealing furnace carry out finished product heat treatment, object is to guarantee the intensity of steel pipe, make the processing strain that produced by cold-drawn residual, obtain high strength cold-drawn steel pipe.

Take that to prepare the 33Mn2V steel pipe that diameter is 5.9mm as 339.7mm and hole wall wall thickness be example, the course of work of the present utility model:

(1), heating: 33Mn2V pipe is heated to 1280 ℃ in annular furnace, and the heat time is 4 hours, thereby guarantees that heating of pipe blank is even;

(2), perforation: heat pipe base is bored a hole through punch, the temperature of the hollow billet forming after perforation is controlled at 1250 ℃, and order control punch eccentricity is 4%, pipe is carried out to visualize, use remove pipe surface burr, stick up skin, if pipe surface occurs or exists to be significantly the obvious pit of naked eyes, runs over and injure and crackle, should reject, avoid flowing into subsequent processing, to control pipe surface quality;

(3), annealing: pipe is introduced in continuous annealing furnace and is annealed, and order to control annealing temperature be 600 ℃, annealing time is 70min, obtains the annealing pipe that annealing hardness (HV) is 210;

(4), cold rolling: the pipe of annealing introducing pipe mill is cold rolling, and the reciprocal time of the headstock of pipe mill is 50 times/min, and the length of at every turn sending to of pipe is 6mm/ time, obtains rolled pipe;

(5), stress relief annealing: rolled pipe is introduced to heating and insulation in heating furnace, after cooling with stove, come out of the stove, obtain the pipe of annealing, object is to guarantee the intensity of steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 550 ℃, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 10 minutes;

(6), pickling processes: annealing pipe is carried out to pickling, removes surperficial scale, concentration of hydrochloric acid: 7%, pickling time: 35 minutes, then neutralization pond rolling, rolling number of times: 2 times, neutralizer pH value: 9, then through clear water reserviors rolling, rolling number of times: 2 times;

(7), phosphatization processes: the chemistry that forms trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 20%, Phosphating Solution temperature: 68 ℃, phosphating time: 10 minutes, Phosphating Solution free acidity: 4, General Acidity in Phosphating Solution: 45;

(8), saponification processes: on overlay film, form the lubricating film coateds such as metallic soap, saponification temperature: 55 ℃, saponification time: 8 minutes, saponification liquor pH value: 8;

(9), cold-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 3mm, pull out machine draft: 350t, saponification pipe pulls out front storage period: 72h;

(10), finished product heat treatment: drawn tube is introduced to annealing furnace and carry out finished product heat treatment, object is to guarantee the intensity of steel pipe, make the processing strain that produced by cold-drawn residual, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 500 ℃, can obtain the effect of work hardening, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 8 hours, and the tapping temperature of cold drawing steel tube is 350 ℃, obtains hardness (HV) at 230 high rigidity cold drawing steel tube.

After testing, institute's inspection project meets GB/T3639-2009 standard to the product that the present embodiment obtains, and product is qualified, has met the requirement that the desired hardness of user (HV) is greater than 220.

The technical performance comparison of a kind of high rigidity cold drawing steel tube and conventional steel pipe

As can be seen here, the product that the utility model is produced has the advantages that hardness is high, surface property is good, produces in enormous quantities, and production efficiency is high, reliable product quality.

Claims

1. a special equipment of producing high rigidity cold drawing steel tube, comprise rotary heating furnace, punch, stress relief annealing stove, pipe mill, heating furnace, acid dip pickle, phosphating plant, device for saponifying, drawbench, annealing furnace, it is characterized in that: described rotary heating furnace be linked in sequence punch, stress relief annealing stove, pipe mill, heating furnace, acid dip pickle, phosphating plant, device for saponifying, drawbench, annealing furnace.