Steel plate hydraulic-forming production method and process of construction fastener

Abstract

The invention provides a steel plate hydraulic-forming production method and process of a construction fastener. In the method, a common hot-rolled steel plate Q235 with the thickness of 5mm or more than 5mm is exclusively utilized as a production raw material of the fastener, and a special hydrostatic press with the pressure of not less than 200T is adopted for forming the innovatively designed fastener in a special hard die, which realizes continuous mechanized production operation of the fastener and innovation of the production method and process of the construction fastener. The fastener produced by the method and process provided by the invention has the advantages of good skid resistance, good breaking resistance, good tension resistance and good deformation resistance, and reaches and exceeds the national and international fastener quality standards; and meanwhile the production method and process can replace those of the cast-iron fastener which has the defects such as high energy consumption, high pollution, high carbon emission, low quality, low safety and low efficiency.

Description

technical field [0001] The invention belongs to the technical field of building construction equipment manufacturing, and specifically relates to a production method and production process innovation of a fastener for building construction, a product that is used in a large amount in building construction and requires high safety. Background technique [0002] Fasteners for building construction (hereinafter referred to as fasteners) are used to firmly connect steel pipes and steel pipes to form steel frames such as load-bearing frames, support frames, working frames, scaffolding, safety frames, and isolation frames for various constructions. Frame fasteners. As the connection fastener of the steel frame, the fastener must not break, slip or deform under the load-bearing and pressure-bearing state, so as to ensure the stability and reliability of the steel frame and ensure the safety of the construction personnel and property. [0003] The load-bearing fasteners used in con...

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Problems solved by technology

[0006] The defects of the production method and production process of cast iron fasteners are as follows: (1) The thermal production process of cupola smelting and high temperature tempering heat treatment has high energy consumption, high pollution and high carbon emissions It has been defined by the "energy saving and emission reduction" policy as the elimination of restricted production methods and production processes

⑵ Sand mold (soft mold) is used for casting molding, artificial mold making and high temperature gravity of molten iron act on the soft mold, so the process error of product molding is large, all ≥ millimeter level, and high temperature tempering heat treatment produces secondary deformation, so the structural size of the product Errors lead to less than 50% pass rate of batch products

⑶ As the composition of molten iron adjusts the amount of precious metals added, and the adjustment of high-temperature heat treatment temperature and holding time is manually controlled, it is difficult to ensure that the material composition meets the standard, and it is difficult to ensure that the fastener toughness meets the standard, so the product has too high carbon content and insufficient toughness. Gray cast iron fasteners often break during construction and load-bearing use, resulting in scaffold collapse accidents that have occurred frequently over the years

⑷The production efficiency is low, sand-type manual molding takes up a lot of space, repeated molding is time-consuming and labor-intensive, the working environment is dusty, the labor intensity is high, it is difficult to increase the daily output and monthly output, and the production process takes a long time, from smelting molten iron to heat treatment The cycle is at least 4 days, it is difficult to achieve large-scale production

[0007] In summary, the cast iron production method of building fasteners and the cast iron fasteners produced by sand molding process are high energy consumption, high carbon emission, high pollution, low Production capacity, low quality, low safety products

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