Processing method for flat wire used for tensioning wheel of engine

Abstract

The invention discloses a processing method for a flat wire used for a tensioning wheel of an engine. The processing method comprises the following steps of drawing a carbon steel wire rod or an alloy steel wire rod with the diameter of 11.0-12.0 mm into roulette wounded wire with the diameter of 10.0-10.8 mm; heating the steel wire to a temperature of 900-1,100 DEG C at a heating speed of 6.0-12.0 m / s by power-on heating; rolling the roulette wounded wire to the thickness of 3.4-4.5 mm and the width of 16.5-17.0 mm through a rolling mill once; performing pickling and phosphating surface treatment on the hot-roll flat wire; drawing the wire into the size of a product; winding the wire by a detachable roulette; removing the roulette; and carrying out annealing treatment at a temperature of 650-720 DEG C and keeping the temperature for 2-5 h. The production process can roll the wire into required size once, is high in production efficiency and stable in product quality, can save energy consumption, overcomes the disadvantages of a conventional production process, and omits tedious backwinding and pickling processes.

Description

technical field [0001] The invention relates to the technical field of special-shaped steel wires in the metal product industry, and mainly relates to a processing method for wide spring flat steel wires for engine tension wheels. Background technique [0002] At present, the known wide spring flat wire for producing engine tensioner is to adopt the method of multipass cold rolling plus intermediate heat treatment. The principle is to carry out stress relief annealing in the pit furnace after 2-3 rolling, and then carry out rolling after surface treatment, and so on, and finally produce products that meet the requirements through die-drawing finishing (see figure 1 ). [0003] The above-mentioned method of adopting multi-pass cold rolling plus intermediate heat treatment has the following disadvantages: 1. Multi-pass rolling and multiple annealing are required, and the cost is high; 2. Multi-pass rolling and multiple annealing have low productivity and shorten the productio...

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Problems solved by technology

[0003] The above-mentioned method of adopting multi-pass cold rolling plus intermediate heat treatment has the following disadvantages: 1. Multi-pass rolling and multiple annealing are required, and the cost is high; 2. Multi-pass rolling and multiple annealing have low productivity and shorten the production cycle. 3. During the annealing of the well-type furnace, the temperature at each point in the furnace is not uniform, and during the heating process, the outer layer of the steel wire usually reaches the set heat treatment temperature first. Under the same holding time, the hardness of the outer layer It is lower than the inner layer, that is, the hardness of the whole steel wire is uneven. Due to the relationship between the width of the steel wire and the hardness of the steel wire, the width of the flat steel wire cannot be controlled during the next rolling, and the product quality is difficult to guarantee; 4. Cold rolling is prone to cracking Phenomenon, resulting in high product rejection rate

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