CN101347886B

CN101347886B - Nonuniform heating enclosed method in large-sized high-pressure bottle heat sleeve stove

Info

Publication number: CN101347886B
Application number: CN2008101968279A
Authority: CN
Inventors: 王钢桥
Original assignee: YICHANG JIANGXIA MARINE MACHINERY CO Ltd
Current assignee: YICHANG JIANGXIA MARINE MACHINERY CO Ltd
Priority date: 2008-08-27
Filing date: 2008-08-27
Publication date: 2012-03-21
Anticipated expiration: 2028-08-27
Also published as: CN101347886A

Abstract

The invention relates to an in-furnace non-uniform heating shrink fit method of a large high pressure vessel shrink fit barrel; the outside of an inner barrel and the inside of an outer barrel are firstly processed, and the upper and lower ends of the outer barrel are symmetrically drilled with exhaust vents; a face flange is mounted at the bottom of a pit furnace; the outer barrel is lifted intothe furnace and placed on the face flange; the outer barrel is heated by the furnace, the temperature of the outer barrel is controlled to be 380-450DEG C from top to bottom, and the temperature is kept for 1-2h; the inner barrel is directly sheathed in the outer barrel in the furnace and when the temperature in the furnace drops to below or equal to 80 DEG C, the shrink fit of the inner and outer barrels is completed. As the invention adopts the in-furnace shrink fit mode, the situations of blockage and incapability to sheathe due to the excessive shrinking of the outer barrel caused by excessively quick temperature reduction outside the furnace can be avoided; the outer barrel forms trapezoid linear structure which is large at the bottom and small at the top by non-uniform heating; if the inner barrel can enter successfully, the shrink fit can be carried out smoothly due to relatively large swelling amount at the lower end, thus improving the shrink fit efficiency.

Description

Non-uniform heating fit method in the large-scale high-pressure bottle shrink-fitted shell stove

Technical field

The present invention relates to a kind of fit method of large-scale high-pressure bottle shrink-fitted shell, particularly be directed against the fit method of the large-scale high-pressure bottle shrink-fitted shell of low alloy steel plate making.

Background technology

Low alloy steel plate is the main steel plate that China makes high-pressure bottle at present, is characterized in that strength high toughness is good, when making the hot jacket high-pressure bottle as normal steels.Hot jacket generally adopts outer cylinder body evenly to be heated to a certain temperature; Be inserted in inner barrel when reaching the fit gap; This method is used comparatively common; But often because from stove, to hang out outer cylinder body cover fashionable, exist rock and cause horizontal displacement and since under the outer cylinder body temperature the too fast instability in vertical direction of cooling cause and the fit difficulty also can cause the fit failure to do over again sometimes.

Summary of the invention

The objective of the invention is to provide a kind of directly very well inside and outside cylindrical shell fit, interior non-uniform heating fit method of the high-pressure bottle shrink-fitted shell stove that the fit success rate is high of carrying out in heating furnace.

The objective of the invention is to realize like this: non-uniform heating fit method in a kind of high-pressure bottle shrink-fitted shell stove,

The inner barrel outside, outer cylinder body inboard process, and guarantee that the magnitude of interference is 1.5-2.5mm between its inside and outside cylindrical shell;

The two ends symmetry is bored steam vent about outer cylinder body;

At the bottom of pit furnace, place the fitting plane flange;

Outer cylinder body is hung in heating furnace, be placed on the face-flange;

Open the heating furnace power supply, heating furnace is heated outer cylinder body, the temperature of control outer cylinder body between 380-450 ℃, is incubated 1-2 hours from top to bottom;

Close heating furnace, open the heating furnace bell, inner barrel directly is inserted in the outer cylinder body in the stove, when temperature in the stove drop to≤80 ℃ the time, inside and outside cylindrical shell fit finishes.

The steam vent diameter is 5mm, lays respectively at lower limb 120-150mm place symmetric arrays on the outer cylinder body.

Non-uniform heating fit method in the large-scale high-pressure bottle shrink-fitted shell stove provided by the invention owing to be the mode that adopts fit in the stove, can not cause the excessive situation that has retardance and cover not to advance that produces of outer cylinder body amount of contraction because of the outer cooling of stove is too fast; Non-uniform heating makes outer cylinder body form up-thin-low-thick trapezoidal linear structure, if inner barrel can successfully get into, because the lower end swell increment gets final product the fluent fit that carries out more greatly, has improved the efficient of fit.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Fig. 1 is the structural representation of pit furnace used in the present invention.

Fig. 2 is an outer cylinder body structural representation of the present invention.

Fig. 3 is an inner barrel structural representation of the present invention.

Fig. 4 is a face-flange structural representation of the present invention.

The specific embodiment

As shown in Figure 1, the present invention uses equipment: the 380KW shaft furnace, and the body of heater 1 of shaft furnace is provided with bell 2; Hanger 3 is installed on the bell 2, the unlatching of control bell 2, the resistance wire 4 that many groups that distribute on the body of heater 1 both sides inwall are used to heat; Resistance wire 4 is connected with electroheat pair 5; Electroheat pair 5 is connected with temperature controller 7 through compensating wire 6, by 4 pairs of cylindrical shell heating of resistance wire, controls different heating temperature through thermocouple 5 and temperature controller 7 in process of production.

Outer cylinder body 8 and inner barrel 9 employed material: 13MnNiMoNbR.

Outer cylinder body internal diameter a is 1468mm, and external diameter b is 1548mm, and wall thickness δ is 40mm, and height h is 2145mm; Inner barrel internal diameter a1 is 1390mm, and external diameter b1 is 1470mm, and wall thickness δ 1 is 40mm, and height h1 is 2145mm, and the face-flange internal diameter c that is adopted is 1200mm, and outside diameter d is 1700mm, and height h2 is 40mm.

Inside and outside cylindrical shell fit process of the present invention is following:

1, machined is carried out in the inner barrel outside, outer cylinder body inboard, guarantees that the magnitude of interference is 1.5-2.5mm between its inside and outside cylindrical shell;

2, symmetry is bored 4 of Φ 5 steam vents on the circumference of 120-150mm under the two edges about the outer cylinder body distance;

Comprehensively the inspection inner barrel outside and outer cylinder body inner surface situation guarantee noly anyly to splash, damage, cut etc.;

3, furnace bottom is cleaned out, put down fitting plane flange 10, and proofread and correct with level meter at place, furnace bottom center;

4, hang in outer cylinder body and steadily be placed on the plane face flange, and proofread and correct with vertical line and level meter;

5, carry out sign on two longitudinal seam tops of outer cylinder body;

6, open the heating furnace power supply, heating furnace is heated outer cylinder body, the temperature of control outer cylinder body between 380-450 ℃, is incubated 1-2 hours from top to bottom;

7, with inner barrel with after the driving lifting, check with level meter and vertical line, guarantee vertically, with driving a vehicle inner barrel is lifted in the urceolus, smooth for the assurance fit, the decrease speed of driving a vehicle is the 8m/ branch.

8, after fit finishes, can come out of the stove when stove inner barrel temperature drops to below 80 ℃, and steadily place.

Outer cylinder body heating process:

1. hot cover process standard room temperature is gone into stove

2. be warming up to 380 ℃

3. adjust each regional temperature, 400 ℃ of epimeres, 420 ℃ in stage casing, 450 ℃ of hypomeres, the upper, middle and lower in the outer cylinder body are with confirming after the cylindrical shell height trisection of required heating for three sections.

4. temperature retention time is not less than 2 hours.

5. measure outer cylinder body diameter of bore (intersect and measure twice) measurement data such as table one in stove with measuring stick, guarantee turnover easily, non-resistance.

Outer cylinder body diameter of bore unit is mm behind table one heat tracing

The position	mm	mm
			Go up at (2000mm place)	1472	1472.5
In (1200mm place)	1474	1474
			(600mm place) down	1476	1476

Check:

1. after fit finishes, connect section face slit with the inspection of 0.05-0.1mm clearance gauge and be zero;

2. knock shrink-fitted shell with metal bar, do not have empty sound;

3. descend metallographic structure in directly observing on the outer cylinder body with portable metallographic microscope, be the granular ferrite of 65%-75%, the 25%-35% pearlite is with the original structure state consistency;

4. the mechanical performance at three places is respectively under on the outer cylinder body:

The position	Yield strength σ _s/Mpa?	Tensile strength sigma _b/Mpa?	Stretching δ/%	Ballistic work AK/J	Clod wash a=180 °
						Top	525	670	20	120、54、58	Intact
The middle part	530	685	22	54、58、60	Intact
						The bottom	525	675	22	50、58、58	Intact

Claims

1. non-uniform heating fit method in one kind large-scale high-pressure bottle shrink-fitted shell stove is characterized in that:

The two ends symmetry is bored steam vent about outer cylinder body;

At the bottom of pit furnace, place the fitting plane flange, and proofread and correct with level meter;

Outer cylinder body is hung in heating furnace, be placed on the face-flange, and proofread and correct with vertical line and level meter;

Open the heating furnace power supply, heating furnace is heated outer cylinder body, the temperature of control outer cylinder body between 380-450 ℃, is incubated 1-2 hour from top to bottom;

Close heating furnace, open the heating furnace bell, inner barrel directly is inserted in the outer cylinder body in the stove, guarantee vertically with vertical line and level meter inspection; When temperature in the stove drop to≤80 ℃ the time, inside and outside cylindrical shell fit finishes.

2. non-uniform heating fit method in the large-scale high-pressure bottle shrink-fitted shell stove according to claim 1, it is characterized in that: the steam vent diameter is 5mm, lays respectively at lower limb 120-150mm place symmetric arrays on the outer cylinder body.