阅读说明：本技术 冷镦用线材拉拔工艺 (Wire drawing process for cold heading ) 是由 蒋永峰 章俊华 于 2021-07-01 设计创作，主要内容包括：本发明提供一种冷镦用线材拉拔工艺,涉及线材技术领域,包括以下步骤：步骤一、预处理；步骤二、退火处理；步骤三、抛丸处理；步骤四、清洗处理；步骤五、拉拔处理；本发明提供了通过预处理和退火处理对线材进行清除表面粘结的除锈处理,然后再通过抛丸机进行抛丸处理,进一步除锈,再通过高压清洗,上述多种方式配合,拉拔后的制品表面粗糙度低,使得拉拔工艺有效代替酸洗,环保性能好,且大大降低了能耗。(The invention provides a wire drawing process for cold heading, which relates to the technical field of wires and comprises the following steps: step one, pretreatment; step two, annealing treatment; step three, shot blasting treatment; step four, cleaning treatment; step five, drawing treatment; the invention provides the rust removal treatment for removing surface adhesion of the wire through pretreatment and annealing treatment, then the shot blasting treatment is carried out through the shot blasting machine, the rust removal is further carried out, and then the high-pressure cleaning is carried out.)

1. The wire drawing process for cold heading is characterized by comprising the following steps of:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the step one into an annealing furnace for annealing treatment;

step three, shot blasting treatment: placing the annealed wire in a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 18-25 min;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, and quickly drying the cleaned wire in a dryer at the drying temperature of 80-90 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, and placing the dried wire in the drawing die for drawing forming.

2. The wire drawing process for cold heading as claimed in claim 1, wherein the annealing furnace in the second step uses a mixed gas of argon and nitrogen as an annealing atmosphere.

3. The wire drawing process for cold heading as claimed in claim 2, wherein the annealing temperature of the annealing furnace is 450-.

4. The wire drawing process for cold heading as claimed in claim 1, wherein the diameter of the wear-resistant metal ball of the shot blasting machine in the third step is 300-400 μm, and the speed of the shot blasting machine is 108-180 km/h.

5. The wire drawing process for cold heading as claimed in claim 4, wherein the shot blasting machine is a forward and reverse staggered polishing, and the interval time between the forward and reverse polishing is 30-40 s.

6. The wire drawing process for cold heading as claimed in claim 1, wherein the lubricant component in the fifth step is nano titanium dioxide, graphene, glass powder, borax and deionized water.

7. The wire drawing process for cold heading as claimed in claim 6, wherein the weight portion ratio of the nano titanium dioxide, the graphene, the glass powder, the borax and the deionized water is 5-7:13-16:7.5-9.3:10.8-13.4: 24.5-28.5.

8. Use of the wire produced by the wire drawing process for cold heading according to any one of claims 1 to 7 for a bolt.

Technical Field

The invention relates to the technical field of wires, in particular to a wire drawing process for cold heading.

Background

The normal processing technology of the wire rod for cold heading is that the wire rod is spheroidized, annealed, pickled on the surface and then drawn into the material for cold heading.

The pickling technology as a traditional chemical rust removal method has the characteristics of simple operation, stable surface cleanness and quality after pickling and the like, and is used up to now. The pickling process has many problems, such as high cost of pickling, large amount of water for washing residual acid liquor and ferrous chloride on the pickled wire rod, rapid discharge of hydrogen residue due to hot rinsing, environmental influence due to acid mist volatilization in the treatment process, and high energy consumption.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the wire drawing process for cold heading, which effectively replaces acid washing, has good environmental protection performance and greatly reduces energy consumption.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the step one into an annealing furnace for annealing treatment;

step three, shot blasting treatment: placing the annealed wire in a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 18-25 min;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, and quickly drying the cleaned wire in a dryer at the drying temperature of 80-90 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, and placing the dried wire in the drawing die for drawing forming.

Furthermore, the annealing furnace in the second step adopts a mixed gas of argon and nitrogen as an annealing atmosphere.

Furthermore, the annealing temperature of the annealing furnace is 450-550 ℃, the effective length of the annealing furnace is 900-1200mm, and the annealing speed is 35-55 m/min.

Furthermore, the diameter of the wear-resistant metal ball of the shot blasting machine in the third step is 300-.

Furthermore, the shot blasting machine is used for forward and reverse staggered polishing, and the interval time between the forward and reverse polishing is 30-40 s.

Furthermore, in the fifth step, the components of the lubricant are nano titanium dioxide, graphene, glass powder, borax and deionized water.

Furthermore, the weight part ratio of the nano titanium dioxide, the graphene, the glass powder, the borax and the deionized water is 5-7:13-16:7.5-9.3:10.8-13.4: 24.5-28.5.

The wire rod produced by the wire rod drawing process for cold heading is applied to the aspect of bolts.

(III) advantageous effects

The invention provides the rust removal treatment for removing surface adhesion of the wire through pretreatment and annealing treatment, then the shot blasting treatment is carried out through the shot blasting machine, the rust removal is further carried out, and then the high-pressure cleaning is carried out. The lubricant of the drawing die provided by the invention is used for lubricating the wire and the drawing die, so that the drawing hard force is reduced, and the pulling damage and the breaking can be avoided.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the first step into an annealing furnace for annealing treatment, wherein the annealing furnace in the second step adopts mixed gas of argon and nitrogen as annealing atmosphere, the annealing temperature of the annealing furnace is 450 ℃, the effective length of the annealing furnace is 1200mm, and the annealing speed is 45 m/min;

step three, shot blasting treatment: placing the annealed wire into a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 23min, the diameter of a wear-resistant metal ball of the shot blasting machine in the third step is 370 micrometers, the speed of the shot blasting machine is 150km/h, the shot blasting machine performs forward and reverse staggered polishing, and the forward and reverse polishing interval time is 38 s;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, placing the cleaned wire in a dryer for rapid drying treatment, and controlling the drying temperature to be 90 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, wherein the lubricant comprises the components of nano titanium dioxide, graphene, glass powder, borax and deionized water in the fifth step, the weight part ratio of the nano titanium dioxide to the graphene to the glass powder to the borax to the deionized water is 6:15:9.3:10.8:28.5, placing the dried wire into the drawing die for drawing forming, and the surface roughness of the formed wire reaches Ra0.6um.

Example 2:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the first step into an annealing furnace for annealing treatment, wherein the annealing furnace in the second step adopts mixed gas of argon and nitrogen as annealing atmosphere, the annealing temperature of the annealing furnace is 550 ℃, the effective length of the annealing furnace is 900mm, and the annealing speed is 35 m/min;

step three, shot blasting treatment: placing the annealed wire into a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 18min, the diameter of a wear-resistant metal ball of the shot blasting machine in the third step is 300 mu m, the speed of the shot blasting machine is 180km/h, the shot blasting machine performs forward and reverse staggered polishing, and the forward and reverse polishing interval time is 30 s;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, placing the cleaned wire in a dryer for rapid drying treatment, and controlling the drying temperature to be 80 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, wherein the lubricant comprises the components of nano titanium dioxide, graphene, glass powder, borax and deionized water in the fifth step, the weight part ratio of the nano titanium dioxide to the graphene to the deionized water is 5:14:7.5:11.5:24.5, placing the dried wire rod in the drawing die for drawing forming, and the surface roughness of the formed wire rod reaches Ra0.8um.

Example 3:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the first step into an annealing furnace for annealing treatment, wherein the annealing furnace in the second step adopts mixed gas of argon and nitrogen as annealing atmosphere, the annealing temperature of the annealing furnace is 480 ℃, the effective length of the annealing furnace is 1100mm, and the annealing speed is 40 m/min;

step three, shot blasting treatment: placing the annealed wire into a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 21min, the diameter of a wear-resistant metal ball of the shot blasting machine in the third step is 400 mu m, the speed of the shot blasting machine is 108km/h, the shot blasting machine performs forward and reverse staggered polishing, and the forward and reverse polishing interval time is 40 s;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, placing the cleaned wire in a dryer for rapid drying treatment, and controlling the drying temperature to be 87 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, wherein the lubricant comprises the components of nano titanium dioxide, graphene, glass powder, borax and deionized water in the fifth step, the weight part ratio of the nano titanium dioxide to the graphene to the glass powder to the borax to the deionized water is 7:13:7.9:13.4:25.5, placing the dried wire rod in the drawing die for drawing forming, and the surface roughness of the formed wire rod reaches Ra0.7um.

Example 4:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the first step into an annealing furnace for annealing treatment, wherein the annealing furnace in the second step adopts mixed gas of argon and nitrogen as annealing atmosphere, the annealing temperature of the annealing furnace is 510 ℃, the effective length of the annealing furnace is 1000mm, and the annealing speed is 50 m/min;

step three, shot blasting treatment: placing the annealed wire into a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 25min, the diameter of a wear-resistant metal ball of the shot blasting machine in the third step is 330 mu m, the speed of the shot blasting machine is 115km/h, the shot blasting machine performs forward and reverse staggered polishing, and the forward and reverse polishing interval is 33 s;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, placing the cleaned wire in a dryer for rapid drying, and controlling the drying temperature to be 83 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, wherein the lubricant comprises the components of nano titanium dioxide, graphene, glass powder, borax and deionized water in the fifth step, the weight part ratio of the nano titanium dioxide to the graphene to the glass powder to the borax to the deionized water is 5:16:8.9:12.7:26.5, placing the dried wire into the drawing die for drawing forming, and the surface roughness of the formed wire reaches Ra0.6um.

Example 5:

a wire drawing process for cold heading comprises the following steps:

step one, pretreatment: selecting wires with corresponding specifications to be placed on a pay-off rack, processing the wires through a tension straightening and withdrawal machine, removing thick oxide layers outside the wires through the tension straightening and withdrawal machine to obtain shell-removed wires, and then performing irregular wire winding through a winding machine;

step two, annealing treatment: feeding the wire rod obtained in the first step into an annealing furnace for annealing treatment, wherein the annealing furnace in the second step adopts mixed gas of argon and nitrogen as annealing atmosphere, the annealing temperature of the annealing furnace is 530 ℃, the effective length of the annealing furnace is 950mm, and the annealing speed is 55 m/min;

step three, shot blasting treatment: placing the annealed wire into a shot blasting machine for shot blasting treatment, wherein the shot blasting time is 20min, the diameter of a wear-resistant metal ball of the shot blasting machine in the third step is 350 mu m, the speed of the shot blasting machine is 145km/h, the shot blasting machine performs forward and reverse staggered polishing, and the forward and reverse polishing interval time is 35 s;

step four, cleaning treatment: firstly, cleaning the wire subjected to shot blasting by using a cleaning agent, cleaning the wire subjected to the cleaning by using a high-pressure water gun at high pressure, placing the cleaned wire in a dryer for rapid drying treatment, and controlling the drying temperature to be 86 ℃;

step five, drawing treatment: and uniformly coating a lubricant in the drawing die, wherein the lubricant comprises the components of nano titanium dioxide, graphene, glass powder, borax and deionized water in the fifth step, the weight part ratio of the nano titanium dioxide to the graphene to the glass powder to the borax to the deionized water is 6:14:8.4:11.9:27.5, placing the dried wire rod in the drawing die for drawing forming, and the surface roughness of the formed wire rod reaches Ra0.8um.

The invention provides the rust removal treatment for removing surface adhesion of the wire through pretreatment and annealing treatment, then the shot blasting treatment is carried out through the shot blasting machine, the rust removal is further carried out, and then the high-pressure cleaning is carried out. The lubricant of the drawing die provided by the invention is used for lubricating the wire and the drawing die, so that the drawing hard force is reduced, and the pulling damage and the breaking can be avoided.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.