A phosphating production finish wire process for the fastener industry

Abstract

The application discloses a phosphating production finished iron wire process for the fastener industry, which comprises the processes of wire drawing by a six-connection straight-line wire drawing machine, annealing by a spheroidizing annealing furnace, phosphating, saponification, wire drawing by a fine drawing machine and the like. The process has the beneficial effects that the annealing process is improved, the step-by-step cooling is performed, and the temperature is lowered to below 280 DEG C in 48 hours, so that the iron wire surface is free of an oxide layer, and the iron wire has proper softness and hardness, and can be directly phosphated; the pickling process is omitted, the phosphating layer can be directly formed on the basis of the oxide layer, and the saponification is performed, so that the smoothness of the iron wire surface is improved, and the product toughness is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of iron wire production, in particular to a phosphating production finished iron wire process for fastener industry. BACKGROUND

[0002] Iron wire is a cold-processed product of steel wire rod, and the material used is usually selected from high-carbon steel or stainless steel. It usually goes through a number of procedures such as disc element peeling, pickling, water washing, saponification, drying, drawing, annealing, cooling, pickling, water washing, zinc plating line, packaging, etc. The existing iron wire production often forms an oxide layer on the surface after annealing treatment, and the iron wire needs to be acidified to remove the surface oxide layer, but acidification treatment will leave residual acid on the surface, which is difficult to clean, and thus the iron wire is prone to rust, reducing the service life. SUMMARY

[0003] The purpose of the present application is to provide a phosphating production finished iron wire process for fastener industry to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme, including the following steps:

[0005] Step one, send low-carbon steel into six straight straight-drawing machine to draw wire; select 6.5 wire rod, and use two dies for the first drawing, the two dies are spaced 10mm apart, one is 6.9 die, and the other is 5.6 die;

[0006] Step two, send the product obtained by the drawing machine to the spheroidizing annealing furnace for annealing; keep the temperature at 600 DEG C for 30 min, then heat to 680 DEG C and keep for 30 min, then heat to 730 DEG C and keep for 480 min; then control the spheroidizing annealing furnace to start cooling, first 240 min to 700 DEG C, then 120 min to 680 DEG C, keep the temperature at 680 DEG C for 120 min, then 120 min to 660 DEG C, keep the temperature at 660 DEG C for 60 min; finally, open the cooling fan to cool to below 280 DEG C and discharge;

[0007] Step three, phosphating the product after annealing; add 60% water to the iron tank, heat to 60 DEG C with steam, then add 40% phosphating solution to the water tank, then heat to 80 DEG C with steam; put the iron wire into the phosphating tank, phosphating for 5 min, then take out and put into the water pool for rinsing for 1 min, then put into the saponification tank for soaking for 3 min and take out;

[0008] Step four, send the phosphating finished iron wire into a single precision drawing machine to draw wire, and the finished product is obtained.

[0009] As a preferred technical scheme of the present application, the low carbon steel is one of SWRCH22A, Q195L, Q235L and ML08AL.

[0010] As a preferred technical scheme of the present application, the die setting in step one is 5.6-4.9-4.2-3.7-3.2-2.8.

[0011] Compared with the prior art, the present application has the beneficial effects that the annealing process is improved, the stepped cooling is combined with the cooling to below 280 DEG C in 48 hours, the surface of the iron wire is free of oxidation layer, the softness and hardness are suitable, and the phosphating can be directly performed; the pickling process is saved, the phosphating layer can be directly formed on the basis of the oxidation layer, the saponification is performed, the smoothness of the surface of the iron wire is improved, and the toughness of the product is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The present application is tested by the following data graph; DETAILED DESCRIPTION

[0013] Example 1

[0014] As shown in the drawings, the present application discloses a phosphating production finished iron wire process for the fastener industry, which comprises the following steps: Figure 1

[0015] Step one, the low carbon steel is sent into a six-connection straight wire drawing machine for wire drawing; a 6.5 wire rod is selected for the wire drawing machine, and two die sets are used for the first wire drawing, the two die sets are arranged at intervals of 10 mm, one is a 6.9 die set, and the other is a 5.6 die set;

[0016] Step two, the product obtained by the wire drawing machine is sent to a spheroidizing annealing furnace for annealing; the temperature is kept at 600 DEG C for 30 min, then the temperature is raised to 680 DEG C and kept for 30 min, and then the temperature is raised to 730 DEG C and kept for 480 min; then the spheroidizing annealing furnace is controlled to start cooling, first to 700 DEG C in 240 min, then to 680 DEG C in 120 min, kept at 680 DEG C for 120 min, then to 660 DEG C in 120 min, kept at 660 DEG C for 60 min; finally, the cooling fan is started to cool to below 280 DEG C and discharge;

[0017] Step three, the product after annealing is phosphated; 60% water is added to the iron tank, steam is heated to 60 DEG C, then 40% phosphating solution is added to the water tank, and then steam is heated to 80 DEG C; the iron wire is put into the phosphating tank for phosphating, taken out from the phosphating tank after 5 min, put into the water pool for rinsing for 1 min, and then put into the saponification tank for soaking for 3 min and taken out;

[0018] ​Step four, the phosphorization finished iron wire is sent into single fine drawing machine to draw wire, namely the finished product is obtained.

[0019] In actual processing, the low carbon steel is Q235L, the step one grinding details is 5.6-4.9-4.2-3.7-3.2-2.8, the finished product obtained by single fine drawing machine is detected by metallographic microscope and hardness tester, the detection result is that the metallographic decarburization layer is about 15 wires, the hardness detection is about HV160-180, which meets the standard. The annealing process is improved, the stepped cooling is adopted, the temperature is reduced to below 280℃ for 48 hours, the iron wire surface is free of oxidation layer, the hardness is appropriate, the phosphorization can be directly carried out, the pickling process is saved, the phosphorization layer can be directly made on the basis of the oxidation layer, the saponification is carried out, the smoothness of the iron wire surface is improved, the product toughness is greatly improved.

[0020] Although the specific embodiments of the present application are described in detail above, the present application is not limited to the above embodiments, various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application, and the modifications or changes without creative labor are still within the protection scope of the present application.

Claims

1. A phosphating process for producing finished iron wire in the fastener industry, characterized in that, Includes the following steps: Step 1: Feed the low carbon steel into a six-section straight-in wire drawing machine for wire drawing; the wire drawing machine uses 6.5 wire rod, and the first wire drawing uses two dies with a 10mm interval between them, one being a 6.9 die and the other a 5.6 die. Step two: The product obtained from the wire drawing machine is sent to a spheroidizing annealing furnace for annealing; it is held at 600℃ for 30 minutes, then heated to 680℃ and held for 30 minutes, then heated to 730℃ and held for 480 minutes; then the spheroidizing annealing furnace is controlled to start cooling down, first to 700℃ for 240 minutes, then to 680℃ for 120 minutes, held at 680℃ for 120 minutes, then to 660℃ for 120 minutes, and held at 660℃ for 60 minutes; finally, the cooling fan is turned on to cool down to below 280℃ before the product is removed from the furnace. Step 3: Phosphate the annealed product; add 60% water to the iron tank, heat with steam to 60°C, then add 40% phosphating solution to the water tank, and then heat with steam to 80°C; put the iron wire into the phosphating tank for phosphating, and after 5 minutes, lift it out of the phosphating tank and rinse it in a clean water tank for one minute, then lift it out and soak it in a saponification tank for 3 minutes before taking it out; Step four: Feed the phosphated iron wire into a single precision drawing machine to draw the finished wire.

2. The phosphating process for producing finished iron wire in the fastener industry according to claim 1, characterized in that: The low-carbon steel is one of SWRCH22A, Q195L, Q235L, or ML08AL.

3. The phosphating process for producing finished iron wire in the fastener industry according to claim 1, characterized in that; The mold matching details in step one are 5.6-4.9-4.2-3.7-3.2-2.8.

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