Production process of stainless steel wire for high-strength digital precision spring

Abstract

The invention relates to a production process of a stainless steel wire for a high-strength digital precision spring, which comprises the following steps: S1, taking a stainless steel wire with a section diameter of 5.5 mm and a brand of SUS302 as a raw material; s2, soaking and cleaning the raw materials in hot water, performing surface membrane treatment, performing air blowing treatment at an outlet of a membrane tank, and performing circular drying in a drying oven; s3, the 5.5 mm raw material is drawn to 3.0 mm; s4, the stainless steel wire treated in the step S3 is subjected to solution annealing treatment; s5, the stainless steel wire obtained after solution annealing treatment is subjected to coating treatment, blowing treatment is conducted at an outlet of a coating groove, then circulating drying is conducted in a drying oven, and fine drawing is conducted to reach 1.5 mm from 3.0 mm; s6, the stainless steel wire treated in the step S5 is subjected to solution annealing treatment; s7, the stainless steel wire treated in the step S6 is subjected to online coating and drying; and S8, the stainless steel wire treated in the step S7 is subjected to finished product drawing. The prepared stainless steel wire is high in strength, consistent and stable in linearity and capable of replacing an imported spring wire in the market.

Description

Technical Field

[0001] The invention relates to the technical field of steel wire production auxiliary equipment, in particular to a production process of stainless steel wire for high-strength digital precision springs. Background Art

[0002] High-strength digital precision springs mainly use stainless steel wire materials such as SUS304, SUS302, and SUS301. These stainless steel wire materials are particularly suitable for manufacturing precision springs due to their high strength, good corrosion resistance, and high temperature resistance. Specifically, SUS304 stainless steel wire has excellent elasticity and fatigue resistance, and is suitable for various high-demand spring applications; SUS302 stainless steel wire, with its high strength and good heat resistance, performs well in the manufacture of springs that need to withstand high temperatures and heavy loads; and SUS301 stainless steel wire, with its high strength and excellent corrosion resistance, has unique advantages in the manufacture of springs used in harsh environments. The application of these stainless steel wire materials ensures the excellent performance and long-term stability of high-strength digital precision springs.

[0003] The stainless steel precision springs currently used in high-end digital products on the market are mainly imported. Domestic stainless steel spring wires have problems such as insufficient strength, insufficient spring stability, and poor consistency. Summary of the invention

[0004] The purpose of the present invention is to provide a production process of stainless steel wire for high-strength digital precision springs. The prepared stainless steel wire has high strength, consistent and stable linearity, and can replace imported spring wires on the market.

[0005] In order to achieve the above-mentioned purpose, a production process of stainless steel wire for high-strength digital precision springs is provided, comprising the following steps:

[0006] S1, stainless steel wire with a cross-sectional diameter of 5.5mm and grade SUS302 is used as the raw material;

[0007] S2, the raw materials are soaked in hot water for cleaning, and then the surface is treated with film, the film tank outlet is blown, and then the oven is circulated and dried;

[0008] S3, 5.5mm raw material is drawn to 3.0mm, the first pass uses calcium powder, and the next 5 passes use sodium powder. The drawing passes are 5.5mm-4.85mm-4.32mm-3.9mm-3.54mm-3.25mm-3.0mm;

[0009] S4, performing solution annealing treatment on the stainless steel wire after the treatment in step S3;

[0010] S5. The stainless steel wire after solution annealing is subjected to film treatment, air blowing treatment is performed at the outlet of the film groove, and then the wire is dried in an oven for circulation, and the wire is finely drawn from 3.0 mm to 1.5 mm. Artificial polycrystalline diamond molds are used for all passes, and the drawing passes are 3.0 mm-2.7 mm-2.46 mm-2.25 mm-2.065 mm-1.9 mm-1.752 mm-1.62 mm-1.5 mm.

[0011] S6, performing solution annealing treatment on the stainless steel wire treated in step S5;

[0012] S7, coating the stainless steel wire after the treatment in step S6 online and drying it;

[0013] S8. Drawing the stainless steel wire processed in step S7 into finished product, the drawing passes are: 1.5mm-1.275mm-1.1mm-0.96mm-0.845mm-0.752mm-0.676mm-0.612mm-0.56mm-0.512mm-0.47mm-0.433mm-0.4mm.

[0014] Specifically, in step S1, the SUS302 stainless steel wire has a C element controlled at 0.1% to 0.15%, a Mn element controlled at 0.7 to 0.9%, and an S element less than 0.001%. Before use, a 360-degree surface inspection is performed.

[0015] Specifically, in the drawing passes in step S3, the first five passes use tungsten steel dies, and the last pass uses a coating die. A pressure die is provided in front of each working die, and the angle of the pressure die is the same as that of the working die. The drawing speed is 3 m / s.

[0016] Specifically, in step S4, the stainless steel wire treated in step S3 is solution annealed using an 8-meter electric furnace; the annealing furnace adopts zone heating and is divided into 6 zones for electric controlled heating; the parameters of each furnace zone are as follows:

[0017]

[0018] The routing speed is controlled at about 5.33 m / min.

[0019] Specifically, in the drawing pass in step S5, a pressure die is provided in front of each working die, and the angle of the pressure die is the same as that of the working die.

[0020] Specifically, in step S6, the stainless steel wire treated in step S5 is solution annealed using a 10-meter electric furnace; the heating is divided into 6 zones, and the parameters of each furnace zone are as follows:

[0021]

[0022] The routing speed is controlled at about 13.3 meters per minute.

[0023] Specifically, in step S8, the first two passes use coating molds, and the rest all use artificial polycrystalline diamond molds. A pressure mold is provided in front of each working mold. The angle of the pressure mold is the same as that of the working mold. The speed is 260 m / min, and 314M lubricating powder is used for all passes.

[0024] Further, in step S8, the tension wheel uses a counter-tension wheel, the finished product reel uses a line dividing wheel to divide the line, and the finished product take-up uses a take-up machine to take up the line.

[0025] Specifically, in step S2, the film-forming agent is a UC570 resin film-forming agent;

[0026] In step S5, the film-forming agent is AM500 film-forming agent;

[0027] In step S7, the coating agent is UC570 resin coating agent.

[0028] Specifically, in step S4 and step S6, an I-shaped wheel is used for wire winding during the solution annealing treatment.

[0029] Compared with the prior art, the production process of stainless steel wire for high-strength digital precision springs of the present invention has the following advantages:

[0030] (1) The stainless steel wire for digital precision springs has high strength, consistent and stable linearity, and high spring stability, replacing imported spring wires on the market;

[0031] (2) Drawing technology is improved, using working dies at different angles and installing pressure dies in front of the working dies. From 5.5 to 1.5, the process of 2 pulls and 1 annealing is improved to 2 pulls and 2 anneals, and one solution annealing is added;

[0032] (3) Improvement of pre-drawing treatment technology. Use different types of coating agents for online pre-treatment and blow air before the wire comes out. After the furnace is retreated, the coating is treated and the wire is taken up by an I-shaped wire take-up machine; the linear control technology of the finished product production line is improved, the traditional winding technology is improved to the wire splitting wheel technology, and the traditional wire accumulation rod extrusion process is improved to the bottom take-up method. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments.

[0034] Example

[0035] The production process of stainless steel wire for high-strength digital precision springs of the present invention comprises the following steps:

[0036] S1. Selection of raw materials: SUS302 5.5mm stainless steel wire is used as the raw material; in Nippon Steel 302 stainless steel raw materials, the C element is controlled at 0.1%-0.15%, the Mn element is controlled at 0.7-0.9%, and the S element is less than 0.001%. Small defects are polished and used, and large defects are directly removed before use;

[0037] S2, the raw materials are soaked in hot water for cleaning, and then the surface is treated with a film, using UC570 resin film, blowing treatment at the film tank outlet, and then drying in an oven;

[0038] S3, 5.5mm raw material is drawn to 3.0mm, the first pass uses calcium powder, the next 5 passes use sodium powder, the drawing passes are 5.5mm-4.85mm-4.32mm-3.9mm-3.54mm-3.25mm-3.0mm, the first five passes use tungsten steel molds, the last pass uses a coating mold, each working mold is equipped with a pressure mold, the angle of the pressure mold is the same as the working mold, and the drawing speed is 3 meters / second;

[0039] S4, 3.0 solution annealing, using 8m electric furnace annealing,

[0040] The annealing furnace adopts zone heating and is divided into 6 zones for electric heating; the parameters of each furnace zone are as follows:

[0041]

[0042] The wire speed is controlled at about 5.33 m / min to ensure uniform heating of the steel wire; the steel wire is completely austenitized during the solution heat treatment, and the C element is evenly dispersed in the crystal structure.

[0043] S5. The stainless steel wire after solution annealing is subjected to coating treatment. The coating agent is AM500 coating agent. The outlet of the coating tank is blown and then dried in an oven. The wire is pulled from 3.0 mm to 1.5 mm.

[0044] All passes use artificial polycrystalline diamond molds, and the drawing passes are as follows:

[0045] 3.0mm-2.7mm-2.46mm-2.25mm-2.065mm-1.9mm-1.752mm-1.62mm-1.5mm;

[0046] A pressure mold is provided in front of each working mold, and the angle of the pressure mold is the same as that of the working mold.

[0047] S6, performing solution annealing treatment on the stainless steel wire treated in step S5;

[0048] Solution annealing was performed using a 10-meter electric furnace;

[0049] Heating is divided into 6 zones, and the parameters of each furnace zone are as follows:

[0050]

[0051] The wire speed is controlled at about 13.3 m / min, so that the steel wire can be heated and cooled quickly; the steel wire is completely austenitized during the solution heat treatment and the grains are refined.

[0052] S7, the stainless steel wire treated in step S6 is coated online and dried, and the coating agent is UC570 resin coating agent;

[0053] S8. Drawing the stainless steel wire treated in step S7 into a finished product, wherein the drawing passes are 1.5mm-1.275mm-1.1mm-0.96mm-0.845mm-0.752mm-0.676mm-0.612mm-0.56mm-0.512mm-0.47mm-0.433mm-0.4mm.

[0054] In this embodiment, in step S8, the first two passes use coating molds, and the rest all use artificial polycrystalline diamond molds. A pressure mold is provided in front of each working mold. The angle of the pressure mold is the same as the working mold. The speed is 260 m / min, and 314M lubricating powder is used for all passes.

[0055] In this embodiment, in step S8, the tension wheel uses a counter-tension wheel, the finished product reel uses a line dividing wheel to divide the line, and the finished product take-up uses a take-up machine to take up the line.

[0056] In this embodiment, in step S4 and step S6, an I-shaped wheel is used for wire take-up during solution annealing treatment (wire rack is used for wire take-up during normal production annealing) to ensure smooth wire release without tangling and linear stability when the final product is drawn.

[0057] The high-strength stainless steel wire for digital precision springs produced by the above-mentioned wire drawing process has the following properties:

[0058] Linear tolerance: +0, -0.001mm;

[0059] Tensile strength: 2100~2200MPA;

[0060] Yield strength: 1850~1950MPA;

[0061] Surface hardness: HV 540~560;

[0062] Head and tail bullet width: ±1mm;

[0063] Head and tail bullet height: 0;

[0064] The surface is consistent with matte.

[0065] It can be seen that the high-strength stainless steel wire for digital precision springs prepared by the process provided by the present invention has correspondingly improved physical properties of tensile strength and yield strength, consistent and stable linearity, and high spring stability.

[0066] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. The production process of stainless steel wire for high-strength digital precision springs is characterized by: The following steps are included: S1, stainless steel wire with a cross-sectional diameter of 5.5mm and grade SUS302 is used as the raw material; S2, the raw materials are soaked in hot water for cleaning, and then the surface is treated with film, the film tank outlet is blown, and then the oven is circulated and dried; S3, 5.5mm raw material is drawn to 3.0mm, the first pass uses calcium powder, and the next 5 passes use sodium powder. The drawing passes are 5.5mm-4.85mm-4.32mm-3.9mm-3.54mm-3.25mm-3.0mm; S4, performing solution annealing treatment on the stainless steel wire treated in step S3; S5. The stainless steel wire after solution annealing is subjected to film treatment, air blowing treatment is performed at the outlet of the film groove, and then the wire is dried in an oven for circulation, and the wire is finely drawn from 3.0 mm to 1.5 mm. Artificial polycrystalline diamond molds are used for all passes, and the drawing passes are 3.0 mm-2.7 mm-2.46 mm-2.25 mm-2.065 mm-1.9 mm-1.752 mm-1.62 mm-1.5 mm. S6, performing solution annealing treatment on the stainless steel wire treated in step S5; S7, coating the stainless steel wire after the treatment in step S6 online and drying it; S8. Drawing the stainless steel wire treated in step S7 into a finished product, wherein the drawing passes are 1.5mm-1.275mm-1.1mm-0.96mm-0.845mm-0.752mm-0.676mm-0.612mm-0.56mm-0.512mm-0.47mm-0.433mm-0.4mm.

2. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S1, the SUS302 stainless steel wire has a C element controlled at 0.1% to 0.15%, a Mn element controlled at 0.7 to 0.9%, and an S element less than 0.001%. Before use, a 360-degree surface inspection is performed.

3. The production process of stainless steel wire for high-strength digital precision springs according to claim 1 or 2, characterized in that: In the drawing passes in step S3, the first five passes use tungsten steel dies, and the last pass uses a coating die. A pressure die is provided in front of each working die, and the angle of the pressure die is the same as that of the working die. The drawing speed is 3 m / s.

4. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S4, the stainless steel wire treated in step S3 is solution annealed using an 8-meter electric furnace annealing process; The annealing furnace adopts zone heating and is divided into 6 zones for electric heating; the parameters of each furnace zone are as follows: The routing speed is controlled at about 5.33 m / min.

5. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In the drawing pass in step S5, a pressure die is provided in front of each working die, and the angle of the pressure die is the same as that of the working die.

6. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S6, the stainless steel wire treated in step S5 is solution annealed using a 10-meter electric furnace annealing process; Heating is divided into 6 zones, and the parameters of each furnace zone are as follows: The routing speed is controlled at about 13.3 meters per minute.

7. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S8, the first two passes use coating molds, and the rest all use artificial polycrystalline diamond molds. A pressure mold is provided in front of each working mold. The angle of the pressure mold is the same as that of the working mold. The speed is 260 m / min, and 314M lubricating powder is used for all passes.

8. The production process of stainless steel wire for high-strength digital precision springs according to claim 7, characterized in that: In step S8, the tension wheel uses the counter-tension wheel, the finished product reel uses the line dividing wheel to divide the line, and the finished product take-up uses the down-take-up machine to take up the line.

9. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S2, the coating agent is UC570 resin coating agent; In step S5, the film-forming agent is AM500 film-forming agent; In step S7, the coating agent is UC570 resin coating agent.

10. The production process of stainless steel wire for high-strength digital precision springs according to claim 1, characterized in that: In step S4 and step S6, an I-shaped wheel is used for wire winding during the solution annealing treatment.

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