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Machining and forming process for corrosion-resistant screw for ship

A processing molding and corrosion-resistant technology, applied to nuts, bolts, applications, etc., can solve the problems of weakened corrosion resistance and waste of resources, and achieve the effects of improving weather resistance, reducing defective rate, and high chemical activity

Inactive Publication Date: 2021-04-23
佛山市南海区巨人化学品制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, some screws are coated with zinc-rich paint to achieve anti-corrosion effect in the molding process of surface treatment, but the zinc content in the zinc-rich paint is too high, even accounting for 70-80%, which not only causes waste of resources , and, with the reduction of zinc content, the corrosion resistance effect is gradually weakened

Method used

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  • Machining and forming process for corrosion-resistant screw for ship

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A process for processing and forming corrosion-resistant screws used in ships, specifically comprising the following steps:

[0028] (1) Put the CH38F wire rod into the hanging furnace, slowly raise the temperature for 3.5h to 740°C, keep it for 5h, and then cool down to room temperature with the furnace to obtain the pretreated CH38F wire rod;

[0029] (2) Immerse the pretreated CH38F wire rod in hydrochloric acid with a mass concentration of 15% for 20 minutes, take it out and wash it with water;

[0030] (3) Putting the wire rod processed through step (2) into a cold heading machine to form it, so as to obtain the head and the bar of the screw;

[0031] (4) Utilize the thread rolling machine to rub out the thread on the rod of the screw, and repeatedly rub the thread 2 times to obtain the pre-treated screw;

[0032] (5) Heat the pre-treated screw to 650°C, keep it warm for 2 hours, cool to room temperature, then heat to 500°C and temper for 20 minutes, and after coo...

Embodiment 2

[0037] A process for processing and forming corrosion-resistant screws used in ships, specifically comprising the following steps:

[0038] (1) Put the CH38F wire rod into the hanging furnace, slowly raise the temperature for 3.5h to 740°C, keep it for 5h, and then cool down to room temperature with the furnace to obtain the pretreated CH38F wire rod;

[0039] (2) Immerse the pretreated CH38F wire rod in hydrochloric acid with a mass concentration of 15% for 20 minutes, take it out and wash it with water;

[0040] (3) Putting the wire rod processed through step (2) into a cold heading machine to form it, so as to obtain the head and the bar of the screw;

[0041] (4) Utilize the thread rolling machine to rub out the thread on the rod of the screw, and repeatedly rub the thread 2 times to obtain the pre-treated screw;

[0042] (5) Heat the pre-treated screw to 660°C, keep it warm for 2.2h, cool to room temperature, then heat to 550°C and temper for 20min, after cooling to room...

Embodiment 3

[0047] A process for processing and forming corrosion-resistant screws used in ships, specifically comprising the following steps:

[0048] (1) Put the CH38F wire rod into the hanging furnace, slowly raise the temperature for 3.8h to 750°C, keep it warm for 5.5h, and then cool down to room temperature with the furnace to obtain the pretreated CH38F wire rod;

[0049] (2) Immerse the pretreated CH38F wire rod in hydrochloric acid with a mass concentration of 16% for 22 minutes, take it out and wash it with water;

[0050] (3) Putting the wire rod processed through step (2) into a cold heading machine to form it, so as to obtain the head and the bar of the screw;

[0051] (4) Utilize a thread rolling machine to rub out the thread on the rod of the screw, and repeatedly rub the thread 3 times to obtain the pre-treated screw;

[0052] (5) Heat the pre-treated screw to 680°C, keep it warm for 2.5h, cool to room temperature and then heat to 550°C and temper for 25min, after cooling t...

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Abstract

The invention discloses a machining and forming process for a corrosion-resistant screw for a ship, and belongs to the technical field of screw production. The process comprises the following steps of: (1) putting a CH38F wire rod into a hanging furnace to obtain a pretreated CH38F wire rod; (2) immersing the pretreated CH38F wire rod into an acid solution for 20-25 minutes, taking out the wire rod, and washing the wire rod with water; (3) placing the treated wire rod into a cold header to be formed, so as to obtain a head and a rod of the screw; (4) performing thread rolling on the rod by utilizing a thread rolling machine; (5) obtaining an intermediate-treated screw; (6) repeatedly washing the intermediate-treated screw with distilled water for 3-4 times, then drying, and dipping the dried intermediate-treated screw in a corrosion-resistant coating; and (7) taking out the intermediate-treated screw in the step (6) from the corrosion-resistant coating, and performing drying to obtain a target product. According to the process, by means of reasonable process and parameter adjustment, the corrosion resistance, strength and other properties of the machined and formed screw are optimized.

Description

technical field [0001] The invention relates to the technical field of screw production, in particular to a process for forming corrosion-resistant screws used in ships. Background technique [0002] The screw is a tool for tightening the parts of the object step by step by using the physical and mathematical principles of the oblique circular rotation and friction of the object. Screw is a general term for fasteners, a daily colloquial language. Screws are indispensable industrial necessities in daily life: tiny screws used in cameras, glasses, clocks, electronics, etc.; general screws for TVs, electrical products, musical instruments, furniture, etc.; large screws for engineering, construction, and bridges. Screws and nuts; transportation equipment, airplanes, trams, automobiles, etc. are used together with large and small screws. Screws have important tasks in industry. As long as there is industry on the earth, the function of screws will always be important. Screw is...

Claims

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Application Information

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IPC IPC(8): F16B33/00B21K1/46B21H3/06C21D9/00B05D5/00B05D7/14
CPCF16B33/008B21K1/46B21H3/06C21D9/0093B05D5/00B05D7/14
Inventor 邓庆安
Owner 佛山市南海区巨人化学品制造有限公司
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