Manufacturing method for tempering cable clip applied to suspension bridge
A manufacturing method and technology of suspension bridges, applied in the direction of manufacturing tools, bridges, bridge parts, etc., can solve the problems of low carbon content, closely related, and increased manufacturing costs, and achieve internal structure grain refinement, excellent mechanical properties, and internal stress Eliminate the effect
Active Publication Date: 2015-03-25
DEYANG TIANYUAN HEAVY IND
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Problems solved by technology
In order to improve the stress strength of the cable clamp, the conventional method is to increase the wall thickness of the cable clamp and select high-strength grade molding materials. Although this method can improve the stress strength to a certain extent, it also has serious problems. Insufficient defects: 1. The structure is bloated, not only unfavorable for moving and transportation, but also troublesome to install and operate on the suspension bridge, and the locking reliability on the main cable is poor; 2. No matter whether it is to increase the wall thickness or select high-strength molding materials , will inevitably increase the manufacturing cost of the cable clamp, which will lead to high construction cost of the suspension bridge; The internal organizational structure is not uniform enough, resulting in looseness, easy to deform and crack during application, which brings great safety hazards
However, the cable clamps used in suspension bridges are required to have good fluidity and weldability during casting. Based on this characteristic, cable clamps are generally made of low-carbon alloy steel, and low-carbon alloy steel has low carbon content. , is classified as carburizing steel or carbonitriding steel in the heat treatment manual, and its heat treatment parameters are closely related to the carburizing treatment process. If it is quenched and tempered, it is difficult to find suitable parameters related to quenching and tempering treatment. Therefore, The choice of forming material restricts the application of quenching and tempering treatment process on the cable clamp of suspension bridge
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[0024] The present invention comprises the technological process of following sequence:
[0025] 1). Design the forming mold of the cable clamp. The cable clamp forming mold carries the sub-mold for the test bar forming. The sub-mold for the test bar forming must be far away from the position of the sprue on the cable clamp forming mold. It is near the bolt hole of the cable clamp forming mold, and the inner diameter of the cavity of the test rod forming sub-mold is required to be larger than the maximum cavity width of the cable clamp forming mold; the ZG20Mn low-carbon alloy steel is cast into a The cable clamp blank, the axial length of the formed cable clamp blank is 1m, the thickness of the thinnest wall (usually the hole wall of the main cable hole) is 0.015m, and the test rod on the formed cable clamp blank is at the center of the cable clamp blank near the bolt holes (see figure 1 , test bar II), and the cross-sectional thickness of the test bar is greater than the ma...
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A manufacturing method for a tempering cable clip applied to a suspension bridge comprises the following steps: (1) casting cable clip blank material with a test bar, normalizing and tempering the cable clip blank material after stress relief annealing, and machining the cable clip blank material in a rough mode, (2) grinding and detecting the surface of the cable clip blank material, (3) detecting the chemical composition of the test bar and deciding a heat-treating process, (4) fixing a support in a main cable hole of the cable clip blank material, (5) placing the cable clip blank material axially and vertically in a tempering processing furnace and enabling the cable clip blank material not to be overlapped with and touch other parts, (6) processing the cable clip blank material in a quenching and heating mode at the temperature of 890-910 DEG C for three hours, cooling the cable clip blank material through quenching oil, then processing the cable clip blank material in a high-temperature tempering and heating mode at the temperature of 640-660 DEG C for four hours, and cooling the cable clip blank material through air, and (7) taking down the test bar, detecting the mechanical properties of the test bar, and carrying out flaw detection and fine-machining processing on the cable clip blank material corresponding to the qualified test bar until the cable clip blank material becomes a finished product.
Description
technical field [0001] The invention relates to components of suspension bridges, in particular to a method for manufacturing quenched and tempered cable clamps applied to suspension bridges. Background technique [0002] In the structure of the suspension bridge, the cable clamp is the connecting piece between the main cable and the suspension cable. It is used to transmit the static load and dynamic load of the bridge deck to the main cable. safety of the entire bridge. [0003] At present, the cable clips of suspension bridges are generally cast from low-carbon alloy steel, and the heat treatment process of the forming is normalizing + tempering, so as to eliminate the internal stress of the cast cable clip blank and reduce the material hardness. The force strength is directly proportional to the wall thickness value and the strength grade of the molding material. However, in recent years, the design and construction of suspension bridges are moving towards large spans,...
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IPC IPC(8): E01D19/16C21D9/00C21D1/26C22C38/04C22C38/06
Inventor 唐明赵鹏贤陈远林刘昌华谭智宸阮明友
Owner DEYANG TIANYUAN HEAVY IND