Cemented Carbide Rolling Mill Roll Tapered Interface
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Solution Overview
Problem
Rolling mill rolls made of cemented carbide used in overhung type rolling mill machines are prone to cracking due to tensile stress, leading to increased production costs and reduced operational efficiency, as existing methods either use excessive cemented carbide or apply intense surface pressure that causes cracking.
Innovation Solution
A rolling mill roll comprising a cemented carbide ring and a metal base, where the circumferential interface is tapered at an angle of 0°10' to 2°00', fixed with a methacrylate resin adhesive, reducing tensile stress and preventing cracking by distributing contact pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rolling mill roll is made of cemented carbide and fixed using a tapered sleeve that presses radially outward, then the roll is securely fixed on the roll shaft, but tensile stress is applied circumferentially causing cracks to occur on the outer circumferential face
Solution Approach 1:
The rolling mill roll is divided into two separate components: a rolling mill ring made of cemented carbide and a metal base. This segmentation allows each component to be optimized for its specific function - the ring provides the hard rolling surface while the metal base provides tensile strength to resist cracking under radial pressure.
Solution Approach 2:
The invention uses a composite structure combining cemented carbide (for hardness and wear resistance) with a metal base material (for ductility and tensile strength). This composite approach allows the rolling mill roll to simultaneously achieve the hardness needed for rolling operations and the tensile strength needed to prevent cracking under fixation pressure.
2Strength
If the radial thickness of the rolling mill roll is increased to prevent cracking, then cracking is reduced, but the amount of cemented carbide used becomes excessively large increasing production cost
Solution Approach 1:
Instead of making the entire rolling mill roll thick to prevent cracking, the invention applies local quality by providing tensile strength only where needed - in the metal base portion that is not subjected to rolling contact. The rolling mill ring maintains its normal thickness for cost efficiency while the metal base provides the necessary structural support against cracking.
3Quantity of substance
If only the outer circumferential face is made of cemented carbide to reduce cost, then production cost is reduced, but the roll becomes prone to cracking when fixed with radial pressure
Solution Approach 1:
The rolling mill roll is segmented into a cemented carbide ring for the rolling surface and a separate metal base for structural support. This segmentation allows the expensive cemented carbide to be used only where functionally necessary (the rolling contact surface) while the metal base provides the tensile strength needed to prevent cracking during fixation, achieving both cost reduction and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution securely fixes the rolling mill ring and metal base as a single unit, preventing cracking and reducing production costs by minimizing the use of cemented carbide, while maintaining operational efficiency even with overhung type machines.
Implementation Method 1
the circumferential interface is a tapered face which slopes to the axis and a taper angle at which the circumferential interface slopes to the axis is in the range of 0° 10' to 2° 00'
Implementation Method 2
fixed with a methacrylate resin adhesive
Data Source
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AI summary
The present invention is to provide a rolling mil roll including a rolling mill ring and a metal base in which a tensile stress applied to the rolling mill ring located along the outer circumferential face side is reduced; and then cracks thereon are prevented from occurring. The rolling mill roll 10 includes: the rolling mill roll 11 made of cemented carbide having rolling sections 13 on its outer circumferential face 11a; and the metal base 12 located on the inner circumferential face of the rolling mill roll 11. The circumferential interface 14, where the rolling mill ring 11 and the metal base 12 face each other, is fixed radially around its axis L by a contact pressure derived from a fitting section, and also is bound with an adhesive agent M.