CN105643202A - Bending process in iron tower manufacturing - Google Patents

Abstract

The invention discloses a bending process in iron tower manufacturing. The bending process comprises the following steps: 1.1) a cold bending angle of a cold bending Q235 material of a steel plate is not higher than 15 degrees; and a cold bending angle of a Q345 plate is not higher than 7 degrees; 1.3) the bending more than 30 degrees can be performed by an opening welding method; 1.4) an opening/closing angle of the Q235 material is coldly machined not more than 15 degrees; and an opening/closing angle of the Q345 material is coldly machined not more than 10 degrees; 2) a hot bending range is obtained; 2.2) the heating temperature of hot bending is in a shallow cherry red range of 1000-1100 DEG C; the workpiece temperature is 750-850 DEG C; the incandescence color is shallow cherry red; the workpiece temperature is not lower than 750 DEG C; but an oxygen-acetylene gas cutting tool is not used for baking and bending; 2.3) the hot bending prevents the overheating and overburning phenomenon; and the final forging temperature is not lower than 750 DEG C to prevent the hardening phenomenon caused by supercooling; and 6) the surface scratch depth after bending of angle steel is not higher than 1.5 mm; and the thickness of the thinnest place is not lower than 70% of the traditional thickness.

Description

A kind of steel tower manufacture bending process

Technical field

The present invention relates to a kind of steel tower manufacture bending process.

Background technology

Existing steel tower manufacture bending process exists that procedure arrangement is unreasonable, operation is various, and processing parameter is selected unreasonable, and the collocation of each processing parameter is unreasonable, and requires higher to operator's experience so that production cost is higher, quality product is on the low side, yield rate is not high.

Summary of the invention

Because the above-mentioned defect of prior art, technical problem to be solved by this invention be to provide a kind of operation rationally, the steel tower manufacture bending process of low cost of manufacture.

For achieving the above object, the present invention provides a kind of steel tower manufacture bending process, comprises the steps:

1), the curved scope of cold system

1.1), the cold bent angle of the material of the curved Q235 of cold system of steel plate must not be greater than 15 ��; The plate cold bending curvature of Q345 must not be greater than 7 ��;

1.2), angle steel material can adopt the curved scope of cold system

Specification (mm)	The cold bent scope (degree) of Q235 material	The cold bent scope (degree) of Q345 material
			40��63	10	10
63��80	8	8
			80��125	8	6
More than 125	6	5

1.3), curved open and clear mouth welding process can be adopted to carry out making curved processing more than 30 �� of systems, it is necessary to ensure welding quality and intensity;

1.4), the material cold working folding angle of Q235, angle must not more than 15 ��, and the angle at the material cold working folding angle of Q345 must not more than 10 ��;

2) scope that, heat system is curved

2.1) heat that all must carry out, exceeding the curved scope of cold system is made curved; Heating temperature and red-hot color see the following form;

Red-hot color	Temperature (DEG C)	Red-hot color	Temperature (DEG C)	Red-hot color	Temperature (DEG C)
						Brownish black	520-580	Cherry red	780-800	Dark yellow	1050-1150
Red-brown	580-650	Shallow cherry red	800-830	Light yellow	1150-1250
						Garnet	650-750	Light red	830-880	White heat look	1250-1350
Dark cherry red	750-780	Reddish yellow	880-1050

2.2), the heat curved Heating temperature of system within the scope of (1000��1100) DEG C shallow cherry red, workpiece temperature is (750��850) DEG C, and red-hot color is shallow cherry red; Workpiece temperature is not less than 750 DEG C, but be not able to oxygen-acetylene gas cutting tool dry examine system curved;

2.3), hot song should be avoided overheated, burn-off phenomenon, final forging temperature can not lower than 750 DEG C, in order to avoid crossing cold generation hardening phenomenon;

3), must being first familiar with drawing and processing requirement when making curved, grasp the bent angle size of the curved position of system, direction and fire, mold used should meet processing technology requirement, through manufacture experimently curved errorless after, then carry out batch machining;

4), angle steel, steel plate generally make curved after drilling, to bending angle processed, the fiery bent position of big and pitch-row is near, easily produces the curved rear drilling of first system of distortion;

5), fire bent after naturally cooling in atmosphere, do not water or force cooling, the workpiece that need to smooth should be added hammer flattener pad, directly do not beat with hammer, in order to avoid producing uneven hammer trace, causing stress to concentrate, reducing intensity;

6), angle steel system curved after, the edge of steel should round and smooth transition, surface does not have the damage of obvious fold, concave surface, and the surface scratch degree of depth is not more than 1.5mm; Thinnest part thickness is not less than the 70% of original thickness.

The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to effectively improve product quality and production efficiency.

Embodiment

Below in conjunction with embodiment, the invention will be further described:

A kind of steel tower manufacture bending process, comprises the steps:

1), the curved scope of cold system

1.1), the cold bent angle of the material of the curved Q235 of cold system of steel plate must not be greater than 15 ��; The plate cold bending curvature of Q345 must not be greater than 7 ��;

1.2), angle steel material can adopt the curved scope of cold system

Specification (mm)	The cold bent scope (degree) of Q235 material	The cold bent scope (degree) of Q345 material
			40��63	10	10
63��80	8	8
			80��125	8	6
More than 125	6	5

1.3), curved open and clear mouth welding process can be adopted to carry out making curved processing more than 30 �� of systems, it is necessary to ensure welding quality and intensity;

1.4), the material cold working folding angle of Q235, angle must not more than 15 ��, and the angle at the material cold working folding angle of Q345 must not more than 10 ��;

2) scope that, heat system is curved

2.1) heat that all must carry out, exceeding the curved scope of cold system is made curved; Heating temperature and red-hot color see the following form;

Red-hot color	Temperature (DEG C)	Red-hot color	Temperature (DEG C)	Red-hot color	Temperature (DEG C)
						Brownish black	520-580	Cherry red	780-800	Dark yellow	1050-1150
Red-brown	580-650	Shallow cherry red	800-830	Light yellow	1150-1250
						Garnet	650-750	Light red	830-880	White heat look	1250-1350
Dark cherry red	750-780	Reddish yellow	880-1050

2.2), the heat curved Heating temperature of system within the scope of (1000��1100) DEG C shallow cherry red, workpiece temperature is (750��850) DEG C, and red-hot color is shallow cherry red; Workpiece temperature is not less than 750 DEG C, but be not able to oxygen-acetylene gas cutting tool dry examine system curved;

2.3), hot song should be avoided overheated, burn-off phenomenon, final forging temperature can not lower than 750 DEG C, in order to avoid crossing cold generation hardening phenomenon;

3), must being first familiar with drawing and processing requirement when making curved, grasp the bent angle size of the curved position of system, direction and fire, mold used should meet processing technology requirement, through manufacture experimently curved errorless after, then carry out batch machining;

4), angle steel, steel plate generally make curved after drilling, to bending angle processed, the fiery bent position of big and pitch-row is near, easily produces the curved rear drilling of first system of distortion;

5), fire bent after naturally cooling in atmosphere, do not water or force cooling, the workpiece that need to smooth should be added hammer flattener pad, directly do not beat with hammer, in order to avoid producing uneven hammer trace, causing stress to concentrate, reducing intensity;

6), angle steel system curved after, the edge of steel should round and smooth transition, surface does not have the damage of obvious fold, concave surface, and the surface scratch degree of depth is not more than 1.5mm; Thinnest part thickness is not less than the 70% of original thickness.

Claims (1)

1. a steel tower manufacture bending process, it is characterised in that, comprise the steps:

1), the curved scope of cold system

1.1), the cold bent angle of the material of the curved Q235 of cold system of steel plate must not be greater than 15 ��;The plate cold bending curvature of Q345 must not be greater than 7 ��;

1.2), angle steel material can adopt the curved scope of cold system

Specification (mm) The cold bent scope (degree) of Q235 material The cold bent scope (degree) of Q345 material 40��63 10 10 63��80 8 8 80��125 8 6 More than 125 6 5

1.3), curved open and clear mouth welding process can be adopted to carry out making curved processing more than 30 �� of systems, it is necessary to ensure welding quality and intensity;

1.4), the material cold working folding angle of Q235, angle must not more than 15 ��, and the angle at the material cold working folding angle of Q345 must not more than 10 ��;

2) scope that, heat system is curved

2.1) heat that all must carry out, exceeding the curved scope of cold system is made curved; Heating temperature and red-hot color see the following form;

Red-hot color Temperature (DEG C) Red-hot color Temperature (DEG C) Red-hot color Temperature (DEG C) Brownish black 520-580 Cherry red 780-800 Dark yellow 1050-1150 Red-brown 580-650 Shallow cherry red 800-830 Light yellow 1150-1250 Garnet 650-750 Light red 830-880 White heat look 1250-1350 Dark cherry red 750-780 Reddish yellow 880-1050

2.2), the heat curved Heating temperature of system within the scope of (1000��1100) DEG C shallow cherry red, workpiece temperature is (750��850) DEG C, and red-hot color is shallow cherry red; Workpiece temperature is not less than 750 DEG C, but be not able to oxygen-acetylene gas cutting tool dry examine system curved;

2.3), hot song should be avoided overheated, burn-off phenomenon, final forging temperature can not lower than 750 DEG C, in order to avoid crossing cold generation hardening phenomenon;

3), must being first familiar with drawing and processing requirement when making curved, grasp the bent angle size of the curved position of system, direction and fire, mold used should meet processing technology requirement, through manufacture experimently curved errorless after, then carry out batch machining;

4), angle steel, steel plate generally make curved after drilling, to bending angle processed, the fiery bent position of big and pitch-row is near, easily produces the curved rear drilling of first system of distortion;

5), fire bent after naturally cooling in atmosphere, do not water or force cooling, the workpiece that need to smooth should be added hammer flattener pad, directly do not beat with hammer, in order to avoid producing uneven hammer trace, causing stress to concentrate, reducing intensity;

6), angle steel system curved after, the edge of steel should round and smooth transition, surface does not have the damage of obvious fold, concave surface, and the surface scratch degree of depth is not more than 1.5mm; Thinnest part thickness is not less than the 70% of original thickness.