CN100457306C - Rolling process of male connecting plate for bridge truss - Google Patents

Abstract

The rolling process of male connecting plate for bridge truss includes the following steps: cutting the billet into required length; heating in a heating furnace; and rolling in required pass, temperature, roll gap and radial runout. The present invention has the advantages of precisely controlled rolling, high product precision and very high production efficiency.

Description

A kind of milling method of producing bridge truss connecting plate male head plate

Technical field

The present invention relates to a kind of bridge with No. 10 channel-section steel high strength is welded, high accuracy connects the male head plate of usefulness production method.

Background technology

In the hanging stick of large-scale steel structure parts (mainly being bridge) is produced, the connecting plate of No. 10 used channel-section steels has male head plate, female head plate, fagging, obtains through forging machining with square steel in the past again, and purpose is a crystal grain thinning, improve yield strength, obtain the cross sectional shape that cooperates with channel-section steel.The shortcoming of forging again the machining process existence is that the production cycle is long, the cost height, and the cross sectional shape uniformity is poor.

Summary of the invention

For solving the problem that prior art exists, the purpose of this invention is to provide a kind of isothermal steel rolling process of using, production method with accurate control steel rolling, mode with roll forming under the high temperature, steel billet is rolled into male head plate, this method has the requirement that dimensional accuracy height, form and position tolerance high conformity, mechanical property, chemical property all meet the GB1591-94 standard, and production cost is higher 60 times than forging-machining production efficiency.

For achieving the above object, the present invention is achieved through the following technical solutions:

A kind of milling method of producing bridge truss connecting plate male head plate, this method may further comprise the steps:

1), tests by the GB1591-94 standard to the Q345B continuous casting square billet;

2) qualified blank is cut into specific length, be sent to heating furnace and heat, the bringing-up section temperature is controlled at 1200-1250 ℃, and the soaking zone temperature is controlled at 1150-1200 ℃, and furnace atmosphere is a neutral flame;

3) rolling pass, rolling temperature, gap values between rollers, directly jumping value of roller regulation;

1. be the breaking down operation in the 1-2 passage, start rolling temperature 1150-1200 ℃, gap values between rollers 10mm, roller directly jumping are worth 2 millimeters;

2. the 3-4 passage is half finish rolling operation, and start rolling temperature 1100-1000 ℃, it is 850-900 ℃ of isothermal that the 4th passage goes into to roll temperature, gap values between rollers 4mm, directly jumping value of roller 1-2 millimeter;

3. the 5th passage is the finish rolling operation, goes into to roll temperature 800-850 ℃, requires the 4th, 5 passage isothermal continuous rollings, causes mechanical properties decrease to prevent grain growth, 3 millimeters of gap values between rollers, directly jumping value of roller 0.5-1 millimeter;

4) cut off with hot saw by the multiple lengths requirement, go into straightener and correct linearity 1.0, perpendicularity 1.5;

5) check size and tolerance 101 ± 1.0,81 ± 1.0, mechanical test yield strength 〉=345MPa, tensile strength 〉=470MPa after the inspection surface is up-to-standard, can dispatch from the factory.

The invention has the beneficial effects as follows:

Male head plate of the present invention is exclusively used in large bridge, and C10 I-steel in the truss and the high accuracy between the G8 channel-section steel in the truss connect, the high strength welding.Solve the problem that is welded to connect between the different shaped steel of cross sectional shape, realized safety, efficient, the low-cost manufacturing.Forge the method for machining with rolling replacement, rolling every index is all above the index of forging again machining again.Rolling mill practice advanced person of the present invention, control ability is strong, the precision height, high conformity has solved the problem that the forging method machining cycle is long, cost is high, consumptive material is big, can raise the efficiency 60 times.

Male head plate is mainly used in the construction of large bridge, has solved the high strength problem of I-steel-channel-section steel panel point connection positioning accuracy and tie point welding, and male head plate also is applied to military affairs, oil field, robs the usefulness of danger in emergency.

The specific embodiment

A kind of milling method of producing bridge truss connecting plate male head plate, this method may further comprise the steps:

1), tests by the GB1591-94 standard to the Q345B continuous casting square billet;

2) qualified blank is cut into specific length, be sent to heating furnace and heat, the bringing-up section temperature is controlled at 1200-1250 ℃, and the soaking zone temperature is controlled at 1150-1200 ℃, and furnace atmosphere is a neutral flame;

3) rolling pass, rolling temperature, gap values between rollers, directly jumping value of roller regulation;

1. be the breaking down operation in the 1-2 passage, start rolling temperature 1150-1200 ℃, gap values between rollers 10mm, roller directly jumping are worth 2 millimeters;

2. the 3-4 passage is half finish rolling operation, and start rolling temperature 1100-1000 ℃, it is 850-900 ℃ of isothermal that the 4th passage goes into to roll temperature, gap values between rollers 4mm, directly jumping value of roller 1-2 millimeter;

3. the 5th passage is the finish rolling operation, goes into to roll temperature 800-850 ℃, requires the 4th, 5 passage isothermal continuous rollings, causes mechanical properties decrease to prevent grain growth, 3 millimeters of gap values between rollers, directly jumping value of roller 0.5-1 millimeter;

4) cut off with hot saw by the multiple lengths requirement, go into straightener and correct linearity 1.0, perpendicularity 1.5;

5) check size and tolerance 101 ± 1.0,81 ± 1.0, mechanical test yield strength 〉=345MPa, tensile strength 〉=470MPa after the inspection surface is up-to-standard, can dispatch from the factory.

Through evidence, all can realize the present invention in the above-mentioned running parameter.

Claims (1)

1, a kind of milling method of producing bridge truss connecting plate male head plate is characterized in that this method may further comprise the steps:

1), tests by the GB1591-94 standard to the Q345B continuous casting square billet;

2) qualified blank is cut into specific length, be sent to heating furnace and heat, the bringing-up section temperature is controlled at 1200-1250 ℃, and the soaking zone temperature is controlled at 1150-1200 ℃, and furnace atmosphere is a neutral flame;

3) rolling pass, rolling temperature, gap values between rollers, directly jumping value of roller regulation;

1. be the breaking down operation in the 1-2 passage, start rolling temperature 1150-1200 ℃, gap values between rollers 10mm, roller directly jumping are worth 2 millimeters;

2. the 3-4 passage is half finish rolling operation, and start rolling temperature 1100-1000 ℃, it is 850-900 ℃ of isothermal that the 4th passage goes into to roll temperature, gap values between rollers 4mm, directly jumping value of roller 1-2 millimeter;

3. the 5th passage is the finish rolling operation, goes into to roll temperature 800-850 ℃, requires the 4th, 5 passage isothermal continuous rollings, causes mechanical properties decrease to prevent grain growth, 3 millimeters of gap values between rollers, directly jumping value of roller 0.5-1 millimeter;

4) cut off with hot saw by the multiple lengths requirement, go into straightener and correct linearity 1.0, perpendicularity 1.5;

5) check size and tolerance 101 ± 1.0,81 ± 1.0, mechanical test yield strength 〉=345MPa, tensile strength 〉=470MPa after the inspection surface is up-to-standard, can dispatch from the factory.