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2019
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04
Material requirements for rollers
Material requirements for rollers: 1. Wear resistance 2. Toughness 3. Core strength.
Material requirements for rollers:
(1) Wear resistance is a common form of damage to rollers, affecting the surface accuracy and dimensional precision of rolled products. Due to the complex wear mechanism between the rolled product and the roller in the roll gap, there is currently no single wear resistance index that can characterize roller wear resistance. Therefore, the wear resistance of rollers can only be indirectly judged based on composition and hardness.
The basis for selecting roller hardness includes the rolled product, rolling mill, and rolling conditions, as well as cost considerations. Sometimes, operational habits and experience with rollers are even more important. The higher the hardness, the poorer the toughness; this must be considered comprehensively. The hardness of rollers is generally measured using Shore hardness because Shore hardness testers are portable and can be used on rollers while leaving only a small indentation.
(2) Toughness indicators will be selected based on the main damage to the roller surface. The selectable toughness indicators include yield strength, impact toughness, thermal fatigue, fracture toughness, contact fatigue strength, etc. Depending on the specific usage conditions and main damage mechanisms of the roller, generally only one item needs to be selected as a toughness indicator for the roller.
Rollers may leave residual stress due to inconsistent deformation during casting, heat treatment, cladding, and cutting processes. During use, residual stress superimposes with working stress to jointly trigger different damage phenomena.
(3) Core strength requirements for rollers differ between working layers and cores. The strength referred to in general terms should be core strength used to resist bending and torsional stresses to avoid breakage.
The working layer of a roller sometimes directly requires strength; for example, compressive strength can represent its ability to resist compressive cracking on its surface. Due to high testing costs for toughness indicators, strength is sometimes used roughly to indicate a roller's ability to resist various cracks.
Changzhou Saineng Machinery Co., Ltd. has been engaged in cold-rolled pipe machine hole types, cold-rolled pipe machine rollers, cold-rolled pipe machine core rods, cold-rolled pipe machine top heads and other products. It is a professional enterprise specializing in cold-rolling molds and tools. We warmly welcome new and old friends from home and abroad to visit our factory for inspection, guidance, and instruction.
Roller, cold rolling, core rod, top head, machinery
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Telephone:0519-88611708
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E-mail:sainengjx@163.com
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