Saw blade high frequency annealing method

Abstract

The invention relates to a saw blade high frequency annealing method which is characterized in that the equipment working voltage is 380V / 50Hz; the working oscillatory power is 30-60KVA; the working oscillation frequency is 30-100kHz; every set of equipment can anneal 10-20kg / min; the annealing temperature is 550-650 DEG C; the annealing length between the two ends of a saw blade is 20-30mm; the hardness is HRA62-75 after annealing. The method has the advantages of low energy consumption, no pollution, low cost and no danger for operating workers.

Description

Technical field:

[0001] The invention relates to a high-frequency annealing method for a saw blade, in particular to a high-frequency annealing method for a hacksaw blade, and belongs to the field of technological innovation. Background technique:

[0002] my country began to produce hand-used hacksaw blades in 1954, and has a history of more than 50 years. During this period, the traditional production process, especially the annealing process, has been used. The chemical raw material NaNO used in the process 3 and NaNO 2 , high energy consumption, and serious pollution. Each ton of saw blade consumes 3m 3 Water cleaning, and consume 23.5Kg (NaNO 3 and NaNO 2 ), standard coal 67Kg. Based on the annual output of about 2 million boxes (30,000 tons), the water consumption is 60,000m 3 , worth 108,000 yuan; consumes NaNO 3 and NaNO 2 704 tons, worth more than 1.55 million yuan; 2,000 tons of fuel coal, worth 1.8 million yuan. Moreover, the use of these raw materials h...