Unlock instant, AI-driven research and patent intelligence for your innovation.
Drilling/rolling method in manufacturing seamless tube
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A seamless pipe and rolling line technology, applied in the direction of metal rolling, etc., can solve the problems of insufficient fatigue strength of bearings, unrecommended, excessive reduction of roll compression zone, etc.
Active Publication Date: 2006-06-28
NIPPON STEEL CORP
View PDF2 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
In this case, the strength of the bearing supporting the roll shaft is insufficient, especially in the case of a tapered roll, the fatigue strength of the bearing on the entry side is insufficient, and durability becomes a problem
Therefore, excessive shrinkage of the roll compression band cannot be recommended in practice
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0083] A 60mm diameter blank of 18%Cr-8%Ni austenitic stainless steel was used as the test material, and a guide shoe was used to perform thin-wall piercing and rolling with a high degree of workability with a tube expansion ratio of 1.5. The heating temperature of the billet reaches 1250°C. In addition, the hot workability of stainless steel is much worse than that of carbon steel.
[0109] The hot workability of high alloy steel is inferior to that of stainless steel. If the temperature of piercing and rolling exceeds 1275°C, a large amount of interlayer will occur. Therefore, in this embodiment, a blank of 25%Cr-35%Ni-3Mo high alloy steel with a diameter of 70mm was used as a test material, a disk-shaped roll was used, and the tube expansion ratio was performed at a temperature of 1200°C. 2. High processing degree thin-wall piercing and rolling.
[0110] 1. Roll conditions
[0111] Crossing angle γ=30°
[0112] Tilt angle β = 12°
[0113] Compression belt diameter D g =500mm
[0114] Inlet diameter D 1 =300mm
[0115] Outlet diameter D 2 =670mm
[0116] Roll diameter expansion ratio D 2 / D 1 = 2.23
[0117] Enter side roller body width L 1 =300mm
[0118] Width of delivery side roller body L 2 =460mm
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Property
Measurement
Unit
diameter
aaaaa
aaaaa
diameter
aaaaa
aaaaa
diameter
aaaaa
aaaaa
Login to View More
Abstract
The present invention is a piercing-rolling method in the manufacture of seamless pipes that can suppress the effect of rotary forging without excessively reducing the diameter of rolls, and can suppress additional shear strain. This method is characterized in that the inclination angle β of the main roll and the intersection angle γ of the main roll are kept within the range satisfying the following formulas (1) to (3), and the outer diameter d0 of the solid billet and the piercing and rolling The relationship between the outer diameter d and the wall thickness t of the hollow product satisfies the following formula (4), and further, the inlet diameter D1 of the main roll, the outlet diameter D2, the d0, d and γ satisfy the following formula (5) : 8°≤β≤20°...(1)5°≤γ≤35°...(2)15°≤β+γ≤50°...(3)5≤-ψΓ / ψθ≤4.5...( 4)(d / d0) / (0.75+0.025γ)≤(D2 / D1)...(5) However, in formula (4), ψΓ=ln(2t / d0), ψθ=ln[2(d- t) / d0].
Description
Technical field [0001] The present invention relates to a piercing and rolling method of a blank in a seamless pipe manufacturing process. In particular, it relates to a piercing and rolling method that can produce thin-walled capillaries (hollow products) from a blank with a high degree of processing. Background technique [0002] As the manufacturing method of seamless pipes, among the most commonly used methods, there are Mannesmann-plug mill method and Mannesmann-mandrel mill (Mannesmann-mandrel mill). law. Through these methods, a solid billet heated to a predetermined temperature in a heating furnace is pierced by a piercing rolling mill to form a hollow rod-shaped hollow product, and the wall thickness is mainly reduced by an extension rolling mill such as an automatic tube rolling mill and a mandrel-type seamless tube rolling mill. Make it a waste pipe. Then, a reducing mill such as a sizingmachine or a tension reducer mainly reduces the outer diameter to make a seamless...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More