CN108971900B - Method for manufacturing arc beam frame of shed body - Google Patents

Method for manufacturing arc beam frame of shed body Download PDF

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CN108971900B
CN108971900B CN201810924037.1A CN201810924037A CN108971900B CN 108971900 B CN108971900 B CN 108971900B CN 201810924037 A CN201810924037 A CN 201810924037A CN 108971900 B CN108971900 B CN 108971900B
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pipe
temperature
frame
main rod
blank
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CN108971900A (en
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李家文
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CITIC Construction Co Ltd
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CITIC Construction Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes

Abstract

The invention relates to a manufacturing method of a shed body arc beam frame, which comprises a main rod body, and a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the centers of circles of the first pipe body and the second pipe body are on the same horizontal line, the middle position of the upper part of the main rod body is provided with a third pipe body, the third pipe body is simultaneously welded with the first pipe body and the second pipe body on two sides of the main rod body, and the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the working direction of the beam frame.

Description

Method for manufacturing arc beam frame of shed body
Technical Field
The invention relates to a method for manufacturing an arc-shaped beam frame of a shed body, and belongs to the technical field of simple shed bodies.
Background
The arc-shaped shed roof is widely applied in many fields at present, and can conveniently meet various temporary or short-term requirements due to the characteristics of simple structure, light and convenient materials, easy assembly, low cost and the like. The arc-shaped shed roof is required to be firm and stable, and can be quickly and simply constructed. The arc beam frame is a heavy-load weighing component of the shed roof, the service life and safety of the arc beam frame are influenced by the structure of the arc beam frame, and the structure and service life of the arc beam frame in the prior art are not ideal.
Disclosure of Invention
In order to improve the service life and the safety of the prior shed body arc beam frame, the invention provides a manufacturing method of the shed body arc beam frame,
a method for manufacturing an arc-shaped beam frame of a canopy body comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on the two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.4-2.5% of Si, 1.3-1.4% of Fe, 1.1-1.3% of Ti, 0.3-1.2% of Zr, 0.6-0.8% of Nb, 0.3-0.6% of Mo, 0.2-0.3% of Cr, 0.1-0.2% of Zn, and the balance of Cu and inevitable impurities, smelting according to the element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 880-890 ℃, preserving the heat for 30 minutes, keeping the initial forging temperature 880-890 ℃, the final forging temperature 760-780 ℃, forging the ratio of 1.5-3, reheating the forging piece to 800-820 ℃, rolling at the rolling speed of 5-8m/min and the section reduction rate of 40-50 percent to obtain a main rod blank with required size and a rod blank required by manufacturing a pipe,
perforating and extruding the bar billet required by manufacturing the pipe, wherein the extrusion temperature is 740 and 750 ℃, the extrusion speed is 8-15 cm/min, the extrusion ratio is 20-30:1, so as to obtain an extruded pipe billet,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 700-720 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1-1.5 m/min, then the tube blank is heated to 500-580 ℃, the heat preservation time is 30-60 min, and then the second drawing is carried out: drawing temperature 660 and 680 ℃, single-pass drawing elongation 10-15%, drawing speed 0.5-0.8 m/min, controlling the temperature of the pipe blank at 450 and 480 ℃, heat preservation time 2-3 hours, then shearing the required size to obtain the pipe,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 10-15cm/min, the flow rate of the inert gas is 10-12L/min, the welding current is 150-160A, the energy of a welding line is 1.3-1.5KJ/mm, the wire feeding speed is 20-30cm/min,
raising the temperature of the beam frame to 600-640 ℃ at the temperature raising speed of 200-4 ℃ per hour, wherein the ammonia gas flow is 3-4m in the temperature raising stage3At the pressure of 20-25KPa, keeping the temperature at 640 ℃ of 600-3And the pressure is 10-15KPa per hour, and then the shed body is cooled along with the furnace to obtain the shed body arc beam frame.
The manufacturing method of the shed body arc beam frame is characterized in that a casting blank is heated to 880 ℃ and is kept warm for 30 minutes.
The manufacturing method of the arc beam frame of the shed body comprises the steps of initial forging temperature of 880 ℃ and final forging temperature of 760 ℃.
The manufacturing method of the arc-shaped beam frame of the shed body has the advantages that the rolling speed is 6-7m/min, and the reduction rate of the section is 40% -45%.
The manufacturing method of the arc-shaped beam frame of the shed body is characterized in that the extrusion temperature is 750 ℃, and the extrusion speed is 10-12 cm/min.
The manufacturing method of the shed body arc beam frame comprises the following steps of drawing for the first time: the drawing temperature is 700 ℃, and the single-pass drawing elongation is 15-20%.
The manufacturing method of the shed body arc beam frame comprises the following steps of drawing for the first time: the drawing speed is 1-1.2 m/min.
The manufacturing method of the arc beam frame of the shed body comprises the steps of heating a pipe blank to 550 ℃ after primary drawing, and keeping the temperature for 50 minutes.
An arc beam frame of a shed body comprises a main rod body, a first pipe body and a second pipe body, wherein the first pipe body and the second pipe body are symmetrically arranged on two sides of the main rod body, the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.4-2.5% of Si, 1.3-1.4% of Fe, 1.1-1.3% of Ti, 0.3-1.2% of Zr, 0.6-0.8% of Nb, 0.3-0.6% of Mo, 0.2-0.3% of Cr, 0.1-0.2% of Zn, and the balance of Cu and inevitable impurities, smelting according to the element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 880-890 ℃, preserving the heat for 30 minutes, keeping the initial forging temperature 880-890 ℃, the final forging temperature 760-780 ℃, forging the ratio of 1.5-3, reheating the forging piece to 800-820 ℃, rolling at the rolling speed of 5-8m/min and the section reduction rate of 40-50 percent to obtain a main rod blank with required size and a rod blank required by manufacturing a pipe,
perforating and extruding the bar billet required by manufacturing the pipe, wherein the extrusion temperature is 740 and 750 ℃, the extrusion speed is 8-15 cm/min, the extrusion ratio is 20-30:1, so as to obtain an extruded pipe billet,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 700-720 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1-1.5 m/min, then the tube blank is heated to 500-580 ℃, the heat preservation time is 30-60 min, and then the second drawing is carried out: drawing temperature 660 and 680 ℃, single-pass drawing elongation 10-15%, drawing speed 0.5-0.8 m/min, controlling the temperature of the pipe blank at 450 and 480 ℃, heat preservation time 2-3 hours, then shearing the required size to obtain the pipe,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 10-15cm/min, the flow rate of the inert gas is 10-12L/min, the welding current is 150-160A, the energy of a welding line is 1.3-1.5KJ/mm, the wire feeding speed is 20-30cm/min,
raising the temperature of the beam frame to 600-640 ℃ at the temperature raising speed of 200-4 ℃ per hour, wherein the ammonia gas flow is 3-4m in the temperature raising stage3At the pressure of 20-25KPa, keeping the temperature at 640 ℃ of 600-3And the pressure is 10-15KPa per hour, and then the shed body is cooled along with the furnace to obtain the shed body arc beam frame.
The main rod body is respectively welded with the first pipe body and the second pipe body, the third pipe body is respectively welded with the first pipe body and the second pipe body, and the main rod body is tightly attached to the third pipe body.
The first pipe body and the second pipe body of the arc-shaped beam frame of the shed body are respectively positioned on the same horizontal line in the circle center, the third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded and connected with the first pipe body and the second pipe body on the two sides of the main rod body, the stability of the arc-shaped beam frame is enhanced through the arrangement, heavier pressure can be borne, the main rod body plays a bearing role as a rib beam, the three pipe bodies are of a stable structure which can be better arranged by surrounding the main rod body, and the bearing effect is enhanced. The nitriding treatment improves the corrosion resistance and hardness of the surface of the copper alloy and effectively prolongs the service life of the copper alloy.
Drawings
FIG. 1 is a cross-sectional view of an arc-shaped beam frame of a canopy body;
FIG. 2 is an overall view of the arched beam frame of the canopy body.
Detailed Description
As shown in figure 1-2, canopy body arc roof beam structure 1, including main barre 4 and bilateral symmetry set up first body 2 and second body 3, main barre 4 in the roof beam structure cross-section, first body and second body centre of a circle are on same water flat line separately, main barre upper portion intermediate position is provided with the third body, the third body simultaneously with the first body and the second body welded connection of main barre both sides, the main barre, the first body, second body and third body extend along roof beam structure length direction and are the arc extension, the main barre carries out welded connection with first body and second body respectively, the third body is respectively in first body and second body welded connection, the main barre closely laminates with the third body.
Example 1
A method for manufacturing an arc-shaped beam frame of a canopy body comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on the two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.4% of Si, 1.4% of Fe, 1.2% of Ti, 1.25% of Zr, 0.6% of Nb, 0.5% of Mo, 0.3% of Cr, 0.1% of Zn, and the balance of Cu and inevitable impurities, smelting according to the above element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 880 ℃, preserving heat for 30 minutes, keeping the initial forging temperature at 890 ℃, keeping the final forging temperature at 760 ℃, keeping the forging ratio at 1.5-3, reheating the forging to 810 ℃, rolling at the rolling speed of 5-8m/min and the reduction rate of the section at 40% -50% to obtain a main bar blank with required size and a bar blank required by manufacturing a pipe,
performing perforation extrusion on a bar blank required by manufacturing a pipe, wherein the extrusion temperature is 750 ℃, the extrusion speed is 8-15 cm/min, and the extrusion ratio is 20-30:1, so as to obtain an extruded pipe blank,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 710 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1 m/min, then the pipe blank is heated to 520 ℃, the heat preservation time is 30-60 min, and then the second drawing is carried out: the drawing temperature is 670 ℃, the single-pass drawing elongation is 10-15%, the drawing speed is 0.5 m/min, the temperature of the tube blank is controlled at 460 ℃, the heat preservation time is 2 hours, then the required size is cut to obtain the tube,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 10cm/min, the flow rate of the inert gas is 11L/min, the welding current is 150-160A, the energy of the welding line is 1.3-1.5KJ/mm, the wire feeding speed is 25cm/min,
and (3) raising the welded beam frame to 630 ℃ at a temperature rise speed of 230 ℃/h, in a temperature rise stage, the flow of ammonia gas is 3.5m 3/h, the pressure is 20-25KPa, then, the temperature is kept at 620 ℃ for 2 h, in a temperature keeping stage, the flow of ammonia gas is 2.5m 3/h, the pressure is 10-15KPa, and then, cooling along with a furnace to obtain the arc-shaped beam frame of the shed body.
Example 2
A method for manufacturing an arc-shaped beam frame of a canopy body comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on the two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.5% of Si, 1.4% of Fe, 1.1% of Ti, 1.2% of Zr, 0.8% of Nb, 0.6% of Mo, 0.2% of Cr, 0.15% of Zn, and the balance of Cu and inevitable impurities, smelting according to the above element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 880 ℃, preserving heat for 30 minutes, keeping the initial forging temperature at 880 ℃, keeping the final forging temperature at 770 ℃, keeping the forging ratio at 1.5-3, reheating the forging to 800 ℃, rolling at the rolling speed of 5-8m/min and the reduction rate of the section at 40% -50% to obtain a main rod blank with required size and a rod blank required by manufacturing a pipe,
performing perforation extrusion on a bar blank required by manufacturing a pipe, wherein the extrusion temperature is 740 ℃, the extrusion speed is 8-15 cm/min, the extrusion ratio is 20-30:1, obtaining an extruded pipe blank,
carrying out drawing treatment on the extruded tube blank for the first time: drawing temperature is 700 ℃, single-pass drawing elongation is 15-20%, drawing speed is 1-1.5 m/min, then heating the tube blank to 570 ℃, keeping the temperature for 40 min, and then carrying out second drawing: the drawing temperature is 680 ℃, the single-pass drawing elongation is 10-15%, the drawing speed is 0.5-0.8 m/min, the temperature of the tube blank is controlled at 460 ℃, the heat preservation time is 3 hours, then the required size is cut to obtain the tube,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 12cm/min, the flow rate of the inert gas is 12L/min, the welding current is 150-160A, the energy of the welding line is 1.3-1.5KJ/mm, the wire feeding speed is 24cm/min,
and (3) raising the welded beam frame to 640 ℃ at a temperature raising speed of 250 ℃/h, in a temperature raising stage, the flow of ammonia gas is 3m 3/h, the pressure is 20-25KPa, then, the temperature is maintained at 620 ℃ for 2 h, in a temperature maintaining stage, the flow of ammonia gas is 2.4m 3/h, the pressure is 10-15KPa, and then, cooling along with a furnace to obtain the arc-shaped beam frame of the shed body.
Example 3
A method for manufacturing an arc-shaped beam frame of a canopy body comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on the two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.45% of Si, 1.35% of Fe, 1.2% of Ti, 1.2% of Zr, 0.6% of Nb, 0.4% of Mo, 0.25% of Cr, 0.15% of Zn, and the balance of Cu and inevitable impurities, smelting according to the above element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 885 ℃, keeping the temperature for 30 minutes, keeping the initial forging temperature of 885 ℃, keeping the final forging temperature of 765 ℃, forging the forging ratio of 1.5-3, reheating the forging to 810 ℃, rolling at the rolling speed of 5-8m/min and the reduction rate of the section of 40-50 percent to obtain a main bar blank with required size and a bar blank required by manufacturing a pipe,
performing perforation extrusion on a bar blank required by manufacturing a pipe, wherein the extrusion temperature is 750 ℃, the extrusion speed is 8-15 cm/min, and the extrusion ratio is 20-30:1, so as to obtain an extruded pipe blank,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 720 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1-1.5 m/min, then the pipe blank is heated to 560 ℃, the heat preservation time is 30-60 min, and then the second drawing is carried out: the drawing temperature is 670 ℃, the single-pass drawing elongation is 10-15%, the drawing speed is 0.5-0.8 m/min, the temperature of the tube blank is controlled at 450 ℃, the heat preservation time is 2-3 hours, then the required size is cut to obtain the tube,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 14cm/min, the flow rate of the inert gas is 11L/min, the welding current is 150-160A, the energy of the welding line is 1.3-1.5KJ/mm, the wire feeding speed is 28cm/min,
and (3) raising the welded beam frame to 600 ℃ at the temperature raising speed of 200 ℃/h, in the temperature raising stage, the flow of ammonia gas is 4m 3/h, the pressure is 20-25KPa, then, the temperature is maintained at 620 ℃ for 2 h, in the temperature maintaining stage, the flow of ammonia gas is 2.8m 3/h, the pressure is 10-15KPa, and then, cooling along with a furnace to obtain the arc-shaped beam frame of the shed body.
Example 4
A method for manufacturing an arc-shaped beam frame of a canopy body comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, wherein the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on the two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.5% of Si, 1.35% of Fe, 1.15% of Ti, 1.2% of Zr, 0.7% of Nb, 0.5% of Mo, 0.2% of Cr, 0.2% of Zn, and the balance of Cu and inevitable impurities, smelting according to the above element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 890 ℃, keeping the temperature for 30 minutes, keeping the initial forging temperature of 890 ℃, keeping the final forging temperature of 775 ℃, keeping the forging ratio at 1.5-3, reheating the forging to 820 ℃, rolling at the rolling speed of 5-8m/min and the section reduction rate of 40-50 percent to obtain a main bar blank with required size and a bar blank required by manufacturing a pipe,
perforating and extruding a bar billet required by manufacturing a pipe at the extrusion temperature of 745 ℃, the extrusion speed of 8-15 cm/min and the extrusion ratio of 20-30:1 to obtain an extruded pipe blank,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 720 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1-1.5 m/min, then the pipe blank is heated to 540 ℃, the heat preservation time is 50 min, and then the second drawing is carried out: drawing temperature is 660 ℃, single-pass drawing elongation is 10-15%, drawing speed is 0.5-0.8 m/min, pipe blank temperature is controlled at 450 ℃, heat preservation time is 2.5 hours, then required size is cut to obtain pipe,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 15cm/min, the flow rate of the inert gas is 10L/min, the welding current is 150-160A, the energy of the welding line is 1.3-1.5KJ/mm, the wire feeding speed is 22cm/min,
and (3) raising the welded beam frame to 620 ℃ at the temperature raising speed of 250 ℃/h, in the temperature raising stage, the flow of ammonia gas is 3.2m 3/h, the pressure is 20-25KPa, then, the temperature is maintained at 630 ℃ for 3 h, in the temperature maintaining stage, the flow of ammonia gas is 2.4m 3/h, the pressure is 10-15KPa, and then, cooling along with a furnace to obtain the arc-shaped beam frame of the shed body.
Table 1 properties related to pipes according to the invention
Example 1 Example 2 Example 3 Example 4
Tensile strength MPa 255 264 258 252
Grain size mm 0.052 0.058 0.052 0.057
Elongation percentage% 57.44 57.61 58.86 57.97
TABLE 2 Performance after nitriding of the beam mounts
Example 1 Example 2 Example 3 Example 4
Hardness HV 265 271 252 258
Corrosion Rate in 3.0% NaCl solution mm/a 0.091 0.095 0.091 0.098

Claims (7)

1. A manufacturing method of an arc beam frame of a shed body is characterized in that: the arc beam frame comprises a main rod body, a first pipe body and a second pipe body which are symmetrically arranged on two sides of the main rod body, the respective circle centers of the main rod body, the first pipe body and the second pipe body in the cross section of the beam frame are on the same horizontal line, a third pipe body is arranged in the middle of the upper part of the main rod body and is simultaneously welded with the first pipe body and the second pipe body on two sides of the main rod body, the first pipe body, the second pipe body and the third pipe body extend in an arc shape along the length direction of the beam frame,
the manufacturing method comprises the following steps: the main rod body and each pipe body are made of copper alloy, and the chemical component content (wt%) of the copper alloy is as follows: 2.4-2.5% of Si, 1.3-1.4% of Fe, 1.1-1.3% of Ti, 0.3-1.2% of Zr, 0.6-0.8% of Nb, 0.3-0.6% of Mo, 0.2-0.3% of Cr, 0.1-0.2% of Zn, and the balance of Cu and inevitable impurities, smelting according to the element composition to obtain a copper alloy melt, and casting the copper alloy melt to obtain a casting blank;
forging the casting blank, firstly heating the casting blank to 880-890 ℃, preserving the heat for 30 minutes, keeping the initial forging temperature 880-890 ℃, the final forging temperature 760-780 ℃, forging the ratio of 1.5-3, reheating the forging piece to 800-820 ℃, rolling at the rolling speed of 5-8m/min and the section reduction rate of 40-50 percent to obtain a main rod blank with required size and a rod blank required by manufacturing a pipe,
perforating and extruding the bar billet required by manufacturing the pipe, wherein the extrusion temperature is 740 and 750 ℃, the extrusion speed is 8-15 cm/min, the extrusion ratio is 20-30:1, so as to obtain an extruded pipe billet,
carrying out drawing treatment on the extruded tube blank for the first time: the drawing temperature is 700-720 ℃, the single-pass drawing elongation is 15-20%, the drawing speed is 1-1.5 m/min, then the tube blank is heated to 500-580 ℃, the heat preservation time is 30-60 min, and then the second drawing is carried out: drawing temperature 660 and 680 ℃, single-pass drawing elongation 10-15%, drawing speed 0.5-0.8 m/min, controlling the temperature of the pipe blank at 450 and 480 ℃, heat preservation time 2-3 hours, then shearing the required size to obtain the pipe,
bending and deforming the obtained pipe and the main rod blank at the bending temperature of 460 and 480 ℃ to obtain a main rod, a first pipe body, a second pipe body and a third pipe body,
the main rod body, the first pipe body, the second pipe body and the third pipe body are welded under the protection of inert gas, the welding speed is 10-15cm/min, the flow rate of the inert gas is 10-12L/min, the welding current is 150-160A, the energy of a welding line is 1.3-1.5KJ/mm, the wire feeding speed is 20-30cm/min,
raising the temperature of the beam frame to 600-640 ℃ at the temperature raising speed of 200-4 ℃ per hour, wherein the ammonia gas flow is 3-4m in the temperature raising stage3At the pressure of 20-25KPa, keeping the temperature at 640 ℃ of 600-3And the pressure is 10-15KPa per hour, and then the shed body is cooled along with the furnace to obtain the shed body arc beam frame.
2. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: heating the casting blank to 880 ℃, and preserving heat for 30 minutes.
3. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: the initial forging temperature is 880 ℃, and the final forging temperature is 760 ℃.
4. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: the extrusion temperature is 750 ℃, and the extrusion speed is 10-12 cm/min.
5. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: the first drawing: the drawing temperature is 700 ℃, and the single-pass drawing elongation is 15-20%.
6. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: the first drawing: the drawing speed is 1-1.2 m/min.
7. The method for manufacturing the arched beam frame of the canopy body as claimed in claim 1, wherein: after the first drawing, the tube blank is heated to 550 ℃ and the heat preservation time is 50 minutes.
CN201810924037.1A 2018-08-14 2018-08-14 Method for manufacturing arc beam frame of shed body Active CN108971900B (en)

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JPH0941564A (en) * 1995-08-02 1997-02-10 Daiwa House Ind Co Ltd Steel built-up post and post/beam joint structure thereof

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CN2412959Y (en) * 2000-01-28 2001-01-03 三卓工程顾问有限公司 Form beam
CN101220576B (en) * 2008-01-31 2011-06-15 重庆钢铁(集团)有限责任公司 Arcuated steel rail beam and manufacturing method thereof
CN101538684B (en) * 2008-09-23 2011-06-01 山西太钢不锈钢股份有限公司 Stainless steel tube for brake system of rail vehicle and method for producing same
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