Process for producing bright spring wire

Abstract

The application discloses a bright spring steel wire production process, comprising the following steps: S1 film treatment: adopting a film agent for on-line film treatment of steel wire rod, and drying; S2 one-time cold deformation: the steel wire rod after S1 film treatment is subjected to multi-pass cold deformation, and the size of the semi-finished product relative to the finished product is controlled to reserve 85-90% of the finished product reduction; S3 on-line bright annealing: adopting continuous bright heat treatment, after unwinding, firstly washing with a cleaning agent, then washing with water, drying, entering a tube furnace for on-line annealing, mixed gas protection is introduced into the tube, after exiting the furnace, water cooling, drying; S4 secondary cold deformation: multi-pass cold deformation is carried out again, the reduction is 85-90% of the reserved reduction in step S2, and a spring stainless steel wire semi-finished product is obtained; S5 wire twisting: the steel wire semi-finished product obtained in step S4 is subjected to surface wire twisting, and a spring steel wire finished product is obtained, through the wire twisting process, environmental protection and energy saving are realized, and the surface quality of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature wire processing, in particular to a bright spring steel wire production process. BACKGROUND

[0002] Piano wire is a kind of high-strength spring material formed by lead bath quenching and cold drawing, which has very high strength limit and elastic limit, and is widely used as a small spring material. The quality and performance requirements of piano wire are strict, and it can be divided into dynamic load spring, high-stress mechanical spring and valve spring according to the use. The production process of piano wire is generally divided into three parts: rough drawing, annealing (solid solution treatment), fine drawing. After each drawing, the steel wire is drawn again after solid solution treatment, and finally drawn to the required specification, and the deformation amount during the final drawing is adjusted according to the performance of the finished product; when producing piano wire from carbon steel material, the heat treatment before drawing the finished product generally adopts electric contact heating spheroidizing treatment to ensure the uniform performance of the steel wire rod and improve the heating speed, shorten the heating time, and reduce the iron oxide skin and decarburization layer caused by heating. After heat treatment, hydrochloric acid pickling is used to speed up the pickling speed and make the steel wire surface have good surface quality; after pickling, the steel wire without plating layer can be treated with phosphating coating, and the plated steel wire can be treated with yellowing or borax; compared with stainless steel material, the process of making piano wire from carbon steel is complicated, and in order to ensure corrosion resistance, the surface will generally be treated, such as zinc plating, nickel plating, etc. The use of stainless steel material to process steel wire has the advantages of high strength, good plasticity and corrosion resistance without plating; but when preparing spring steel wire from existing stainless steel material, the quality requirements of some products need to reach mirror surface, and the existing rough drawing, annealing (solid solution treatment) and fine drawing cannot meet the quality requirements, and the use of lubricating oil and polycrystalline die to achieve mirror surface products cannot meet the requirements due to the residue of lubricating oil, and the cleaning process for cleaning the lubricating oil will also affect the surface quality. SUMMARY

[0003] The purpose of the present application is to solve the above technical problems, and provide a bright spring steel wire production process, which can form a bright spring wire with high brightness, high elasticity, fatigue resistance, long service life and good quality.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: a bright spring steel wire production process, comprising the following steps:

[0005] S1 film treatment: on-line film treatment of steel wire rod is carried out by using film agent, and drying is carried out;

[0006] S2 one-time cold drawing deformation: the steel wire rod after S1 film treatment is subjected to multi-pass cold drawing deformation, and the size of the semi-finished product relative to the finished product is controlled to be 85-90% of the finished product reduction rate;

[0007] S3 on-line bright annealing: using continuous bright heat treatment, after unwinding, first using cleaning agent to clean, then water washing, drying, entering the tube furnace on-line annealing, mixed gas protection is passed into the tube, after furnace water cooling, drying, winding;

[0008] S4 secondary cold deformation: the steel wire obtained in step S3 is subjected to multi-pass cold deformation again, the reduction is 85-90% reserved in step S2, and a spring stainless steel wire semi-finished product is obtained.

[0009] S5 wire drawing: the steel wire semi-finished product obtained in step S4 is subjected to surface wire drawing, and a spring steel wire product is obtained.

[0010] In order to improve the production quality of the steel wire and ensure the process stability, the further preferred technical scheme further comprises the following steps: S1 film treatment: using a film agent for on-line surface film treatment of Φ6.5-7.5mm stainless steel wire, and then drying in an on-line drying furnace, the furnace temperature is 120-200℃, and the time is 20-30 seconds;

[0011] S2 primary cold deformation: the stainless steel wire after S1 film treatment is subjected to continuous drawing, wherein the reduction of the first pass is controlled within 25-35%, and the reduction of the subsequent passes is gradually reduced, to obtain a stainless steel wire semi-finished product, the stainless steel wire semi-finished product reserves 85-90% of the product reduction rate of the product;

[0012] S3 on-line bright annealing: using a continuous bright heat treatment furnace, after the spool unwinds, first using ultrasonic cleaning, then water washing, drying, entering the tube furnace annealing, the furnace temperature is 1080℃±30℃, the wire speed is 6-8m / min, the mixed gas of 75% H2 and 25% N2 after ammonia decomposition is passed into the tube, after the furnace water cooling, the inverted machine winding, increasing the ultrasonic continuous cleaning, improving the steel wire surface cleanliness, making the steel wire surface without carbonized powder, stain residue, the steel wire surface is clean and bright, reaching the production requirements of mirror surface

[0013] S4 secondary cold deformation: the stainless steel wire semi-finished product obtained in step S3 is subjected to multi-pass cold deformation again, the reduction is 85-90% reserved in step S2, and a spring stainless steel wire semi-finished product is obtained.

[0014] S5 wire drawing: the spring stainless steel wire semi-finished product obtained in step S4 is pulled through guide wheels, between the guide wheels, the spring stainless steel wire semi-finished product passes through a pair of up and down moving wire drawing plates to perform brightening treatment on the surface of the steel wire, and then passes through a pair of left and right moving wire drawing plates to perform brightening treatment on the surface of the steel wire, and through the two wire drawing treatments, a brightened spring steel wire product is obtained.

[0015] In order to improve the effect of the skin film treatment, ensure the process stability, facilitate the worker operation, the further preferred technical scheme has, the skin film treatment includes soaking the steel wire material raw material in the skin film treatment liquid to react, the skin film is generated, the concentration of the skin film treatment liquid is 14-15wt%, the temperature of the skin film treatment liquid is 76-85℃, the soaking time is 24-26min.

[0016] In order to improve the effect of the cold deformation treatment, ensure the process stability, facilitate the worker operation, the further preferred technical scheme has, the steel wire material is put into the drawing device through the wire feeding device, and the cold deformation is carried out;The drawing device includes a straight type drawing machine and a drawing die box;The drawing die box is cooled by circulating water when drawing;The temperature of the circulating water is 25-35℃;The lubricating powder is used in the drawing process;The lubricating powder used in the first pass to the second last pass in the drawing process includes calcium-based lubricating powder;The lubricating powder used in the last pass in the drawing process includes sodium-based lubricating powder.

[0017] In order to control the production quality of the steel wire, ensure the product quality, the further preferred technical scheme has, in the S2 primary cold deformation, the steel wire material is continuously drawn on the drawing machine for five times, the diameter of the steel wire after drawing is 6.5mm-5.5mm-4.7mm-4.1mm-3.6mm-3.2mm, the total compression rate is increased by 5-8%, the compression rate is more than 90%, and the high strength requirement is realized.

[0018] In order to control the production quality of the steel wire, ensure the product quality, the further preferred technical scheme has, in the S4 secondary cold deformation, the stainless steel wire semi-finished product obtained in step S3 is continuously drawn on the drawing machine for ten times, the diameter of the steel wire after drawing is 3.20mm-2.81mm-2.51mm-2.2mm-1.94mm-1.73mm-1.55mm-1.4mm-1.27mm-1.16mm-1.10mm, the total compression rate is increased by 5-8%, the compression rate is more than 90%, and the high strength requirement is realized.

[0019] In order to improve the brightening effect of the steel wire, ensure the process stability, facilitate the operation, the further preferred technical scheme has the following steps: in the S5 wire twisting, the spring stainless steel wire semi-finished product obtained in the step S4 is formed into spiral upper and lower two layers of steel wire lines through a pair of vertically arranged guide wheels, each layer of the steel wire line has N rows of steel wire lines, each layer of the N rows of steel wire lines has a pair of horizontally reciprocating wire twisting plates on the upper and lower sides, the N rows of steel wire lines in each layer pass through the same side pair of horizontally reciprocating wire twisting plates at the same time to perform the brightening treatment on the surface of the steel wire line, and then the spiral left and right two layers of steel wire lines are formed through a pair of horizontally arranged guide wheels, each layer of the steel wire line has N rows of steel wire lines, each layer of the N rows of steel wire lines has a pair of vertically reciprocating wire twisting plates on the left and right sides, and the N rows of steel wire lines in each layer pass through the same side pair of vertically reciprocating wire twisting plates to perform the brightening treatment on the surface of the steel wire line, and the spring steel wire finished product after the brightening treatment is obtained through the two wire twisting treatments.

[0020] In order to improve the brightening effect of the steel wire, ensure the process stability, facilitate the operation, the further preferred technical scheme has the following steps: in the S5 wire twisting, the spring stainless steel wire semi-finished product obtained in the step S4 is formed into spiral upper and lower two layers of steel wire lines through a pair of vertically arranged guide wheels, each layer of the steel wire line has N rows of steel wire lines, each layer of the N rows of steel wire lines has a pair of horizontally reciprocating wire twisting plates on the upper and lower sides, the N rows of steel wire lines in each layer pass through the same side pair of horizontally reciprocating wire twisting plates at the same time to perform the brightening treatment on the surface of the steel wire line, and then the spiral left and right two layers of steel wire lines are formed through a pair of horizontally arranged guide wheels, each layer of the steel wire line has N rows of steel wire lines, each layer of the N rows of steel wire lines has a pair of vertically reciprocating wire twisting plates on the left and right sides, and the N rows of steel wire lines in each layer pass through the same side pair of vertically reciprocating wire twisting plates to perform the brightening treatment on the surface of the steel wire line, and the spring steel wire finished product after the brightening treatment is obtained through the two wire twisting treatments.

[0021] Compared with the prior art, the beneficial effects of the present application are: through the wire twisting process, the traditional manufacturing method of having to use lubricating oil for wire drawing is replaced, environmental protection and energy saving are achieved, and the surface quality of the product is improved; a bright spring wire with high brightness, high elasticity, fatigue resistance, long service life and good quality can be formed; the spring wire has the characteristics of long elastic force decay period and corrosion resistance, and the service life can be more than ten years; the product is suitable for automobile springs and can be used in the lifting glass of the automobile, can replace the products with a service life of 2-5 years on the market, and improves the hardware quality of the product. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The process flow chart of the present application is shown in the figure.

[0023] Figure 2 The wire twisting step process schematic diagram of the present application is shown in the figure.

[0024] In the figure: 10. Steel wire line; 20. Guide wheel; 30. Wire twisting plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Embodiment 1

[0026] As Figure 1As shown, a bright spring steel wire production process, comprising the following steps: S1 film treatment: using film agent for online surface film treatment of 7.5mm stainless steel wire, then online drying oven drying, furnace temperature 120-200℃, time 30 seconds;

[0027] S2 primary cold deformation: the stainless steel wire after S1 film treatment is continuously drawn, wherein the reduction of the first pass is controlled in the range of 25-35%, and the reduction of the subsequent passes is gradually reduced, obtaining a stainless steel wire semi-product, the stainless steel wire semi-product reserves 85-90% of the finished product reduction rate relative to the size of the finished product;

[0028] S3 online bright annealing: using a continuous bright heat treatment furnace, the spool is unwound first using ultrasonic cleaning, then water washing, blowing dry, entering the tube furnace annealing, furnace temperature 1080℃±30℃, line speed 6-8m / min, 75% H2, 25% N2 mixed gas protection is introduced into the tube after ammonia decomposition, water cooling after discharge, inverted machine take-up;

[0029] S4 secondary cold deformation: the stainless steel wire semi-product obtained in step S3 is subjected to multi-pass cold deformation again, the reduction is 85-90% reserved in step S2, obtaining a spring stainless steel wire semi-product;

[0030] S5 wire drawing: the spring stainless steel wire semi-product obtained in step S4 is drawn through guide wheels, between the guide wheels, the spring stainless steel wire semi-product passes through a pair of up and down moving wire drawing plates to brighten the surface of the steel wire, then passes through a pair of left and right moving wire drawing plates to brighten the surface of the steel wire, through two wire drawing processes, the brightened spring steel wire product is obtained. Example 2

[0031] A bright spring steel wire production process, comprising the following steps: S1 film treatment: using film agent for online surface film treatment of Φ6.5mm stainless steel wire, the film treatment includes soaking the stainless steel wire raw material in the film treatment liquid to react to generate a film, the concentration of the film treatment liquid is 14-15wt%, the temperature of the film treatment liquid is 76-85℃, the soaking time is 24-26min, then online drying oven drying, furnace temperature 120-200℃, time 25 seconds;

[0032] S2 one-time cold drawing deformation: The stainless steel wire treated with S1 film is continuously drawn, and the stainless steel wire enters the wire drawing device through the wire-paying device for cold drawing deformation; the wire drawing device includes a straight-in wire drawing machine; the wire drawing device includes a wire drawing die box; the wire drawing die box is cooled by circulating water during wire drawing; the temperature of the circulating water is 25-35°C; lubricating powder is used during the wire drawing process; the lubricating powder used in the first to the second to last pass of the wire drawing process includes calcium-based lubricating powder; the drawing process The lubricating powder used in the final pass of the wire processing includes a sodium-based lubricating powder. The surface reduction rate of the first pass is controlled within the range of 25-35%, and the surface reduction rates of subsequent passes are gradually reduced to obtain a semi-finished stainless steel wire rod. The semi-finished stainless steel wire rod has a surface reduction rate of 85-90% of the finished product size. The stainless steel wire rod is continuously drawn on a wire drawing machine through five passes. The diameter specifications of the steel wire after drawing are 6.5mm-5.5mm-4.7mm-4.1mm-3.6mm-3.2mm in sequence.

[0033] S3 online bright annealing: using a continuous bright heat treatment furnace, after the I-shaped wheel is paid off, it is first ultrasonically cleaned, then washed with water and blown dry, and then enters the tubular furnace for annealing. The furnace temperature is 1080℃±30℃, the line speed is 6-8m / min, and a mixed gas of 75% H2 and 25% N2 after ammonia decomposition is introduced into the tube for protection. After leaving the furnace, it is water-cooled and the wire is taken up by an inverted machine. Ultrasonic continuous cleaning is added to improve the cleanliness of the steel wire surface, so that there is no carbonized powder or stain residue on the steel wire surface. The steel wire surface is clean and bright, meeting the production requirements of mirror surface.

[0034] S4 secondary cold drawing deformation: the stainless steel wire semi-finished product obtained in step S3 is subjected to multiple cold drawing deformation again, the area reduction rate is 85-90% reserved in step S2, and ten continuous drawing passes are performed on the wire drawing machine. The diameter specifications of the steel wire after drawing are 3.20mm-2.81mm-2.51mm-2.2mm-1.94mm-1.73mm-1.55mm-1.4mm-1.27mm-1.16mm-1.10mm, thereby obtaining a spring stainless steel wire semi-finished product. Through multiple drawing, the surface hardening of the steel wire can be made more uniform, forming a spring wire with high elasticity, fatigue resistance, long service life and good quality;

[0035] like Figure 2As shown, S5: the spring stainless steel wire semi-finished product obtained in step S4 is formed into two layers of spiral steel wire 10 by a pair of vertically arranged guide wheels 20, each layer of steel wire 10 has N rows of steel wire 10, each layer of N rows of steel wire 10 has a pair of horizontally reciprocating wire drawing plates 30 on the upper and lower sides, and each layer of N rows of steel wire 10 simultaneously passes through the same side of the pair of horizontally reciprocating wire drawing plates 30 to brighten the surface of the steel wire. This spiral form of the steel wire 10 formed by the guide wheel 20 can form 2N times of contact between the steel wire 10 and the wire drawing plate 30, so that the steel wire 10 can be drawn multiple times to increase the brightness effect. Then, the two layers of steel wire 10 are formed into two layers of spiral steel wire 10 by a pair of horizontally arranged guide wheels 20, each layer of steel wire 10 has N rows of steel wire 10, each layer of N rows of steel wire 10 has a pair of vertically reciprocating wire drawing plates 30 on the left and right sides, and each layer of N rows of steel wire 10 simultaneously passes through the same side of the pair of vertically reciprocating wire drawing plates 30 to brighten the surface of the steel wire 10. The spring steel wire product is obtained by two wire drawing processes. The wire drawing plates 30 are staggered by 90 degrees, so that the steel wire 10 can be in contact with the wire drawing plates 30 in all directions, and the surface of the steel wire 10 after wire drawing is more uniform, and the wire drawing effect is improved.

[0036] Further, in S5, the spring stainless steel wire obtained in step S4 is brightened by 200 mesh cloth in each pair of wire drawing plates; the flexible wire drawing material increases the contact area between the steel wire and the wire drawing material, and the steel wire is wrapped by the wire drawing material, thereby improving the wire drawing and brightening effect.

[0037] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A bright spring steel wire production process, characterized in that: The following steps are involved: S1 coating treatment: Use coating agent to treat the surface of Φ6.5-7.5mm stainless steel wire online, and then dry it in online drying furnace at a temperature of 120-200℃ for 20-30 seconds; S2 single cold drawing deformation: The stainless steel wire treated with S1 film is continuously drawn, wherein the surface reduction rate of the first pass is controlled within the range of 25-35%, and the surface reduction rate of subsequent passes is gradually reduced to obtain a semi-finished stainless steel wire. The semi-finished stainless steel wire has a surface reduction rate of 85-90% of the finished product relative to the size of the finished product; S3 online bright annealing: using a continuous bright heat treatment furnace, the spool is first ultrasonically cleaned after pay-off, then washed with water and blown dry, and then enters the tubular furnace for annealing. The furnace temperature is 1080℃±30℃, the line speed is 6-8m / min, and a mixed gas of 75% H2 and 25% N2 after decomposition of ammonia is introduced into the tube for protection. After leaving the furnace, it is water-cooled and taken up by an inverted machine. S4 secondary cold drawing: the semi-finished stainless steel wire obtained in step S3 is subjected to multiple cold drawing processes again, with the area reduction ratio being 85-90% of that reserved in step S2, to obtain a semi-finished spring stainless steel wire; S5 wire rolling: The spring stainless steel wire semi-finished product obtained in step S4 is formed into two spiral layers of upper and lower stainless steel wires through a pair of vertically arranged guide wheels, each layer of stainless steel wires has N stainless steel wires, and the upper and lower sides of the N stainless steel wires in each layer are provided with a pair of horizontally reciprocating wire rolling plates, and the N stainless steel wires in each layer simultaneously pass through a pair of horizontally reciprocating wire rolling plates on the same side to brighten the surface of the stainless steel wires, and then a pair of horizontally arranged guide wheels are formed into two spiral layers of left and right stainless steel wires, each layer of stainless steel wires has N stainless steel wires, and the left and right sides of the N stainless steel wires in each layer are provided with a pair of vertically reciprocating wire rolling plates, and the N stainless steel wires in each layer simultaneously pass through a pair of vertically reciprocating wire rolling plates on the same side to brighten the surface of the stainless steel wires, and the brightened finished stainless steel wire for spring is obtained through two wire rolling processes.

2. A bright spring steel wire production process as claimed in claim 1, characterized in that: The film treatment includes soaking the stainless steel wire material in a film treatment liquid to react and form a film; the concentration of the film treatment liquid is 14-15wt%; the temperature of the film treatment liquid is 76-85°C; and the soaking time is 24-26 minutes.

3. A bright spring steel wire production process as claimed in claim 1, characterized in that: In the S2 primary cold drawing deformation, the stainless steel wire enters the wire drawing device through the wire pay-off device for cold drawing deformation; the wire drawing device includes a straight-in wire drawing machine and a wire drawing die box; the wire drawing die box is cooled by circulating water during wire drawing; the temperature of the circulating water is 25-35°C; lubricating powder is used during the wire drawing process; the lubricating powder used in the first to the penultimate pass of the wire drawing process includes calcium-based lubricating powder; the lubricating powder used in the last pass of the wire drawing process includes sodium-based lubricating powder.

4. A bright spring steel wire production process as claimed in claim 1, characterized in that: In the S2 single cold drawing deformation, the stainless steel wire is continuously drawn on the wire drawing machine for five times. The diameter specifications of the semi-finished stainless steel wire after drawing are 6.5mm-5.5mm-4.7mm-4.1mm-3.6mm-3.2mm respectively.

5. A bright spring steel wire production process as claimed in claim 1, characterized in that: In the secondary cold drawing deformation in S4, the stainless steel wire semi-finished product obtained in step S3 is continuously drawn on a wire drawing machine for ten times. After drawing, the diameter specifications of the spring stainless steel wire semi-finished product are 3.20mm-2.81mm-2.51mm-2.2mm-1.94mm-1.73mm-1.55mm-1.4mm-1.27mm-1.16mm-1.10mm.

6. A bright spring steel wire production process as claimed in claim 1, characterized in that: In S5 thread rolling, the semi-finished spring stainless steel wire obtained in step S4 is brightened by a 200-mesh scouring pad in each pair of thread rolling plates.

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