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Pan head self-drilling screw and machining method thereof

A technology for drilling tail screws and processing methods, which is applied to screws, manufacturing tools, threaded fasteners, etc., can solve problems such as affecting processing, and achieve the effects of improving cleanliness, uniform surface quality of workpieces, and improving performance

Pending Publication Date: 2021-04-23
SHANGHAI HONGTING FASTENER MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned related technologies, the inventor believes that the pretreatment agent used in the pretreatment before phosphating is mixed with various acids, which is easy to form a layer of coating on the surface of the workpiece during rust removal and degreasing, which will affect the subsequent treatment.

Method used

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  • Pan head self-drilling screw and machining method thereof

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Comparison scheme
Effect test

Embodiment 1

[0050] The processing method of the pan head drill tail screw of the present embodiment comprises the following steps:

[0051] 1) Pickling the steel wire for the first time, washing with water, drying, and then coating a layer of lubricant on the surface of the steel wire, the lubricant is aluminum stearate; the first pickling is soaked in hydrochloric acid with a mass fraction of 10% 8min;

[0052] 2) cold drawing the steel wire after step 1), pulling the wire to a suitable wire diameter, and then performing annealing treatment;

[0053] 3) The steel wire rod after the annealing treatment is carried out pickling for the second time, the pickling solution used in the second pickling is mixed acid A, mixed acid A is prepared by mixing hydrochloric acid and sulfuric acid with a volume ratio of 3:1, and the hydrochloric acid Mass fraction is 15%, and the mass fraction of sulfuric acid is 40%;

[0054] The second pickling is soaked in mixed acid A for 2 minutes, after the secon...

Embodiment 2

[0063] The difference between the processing method of the pan head drilling screw of the present embodiment and the embodiment 1 is that in step 2), the mixed acid B is mixed evenly with oxalic acid, lactic acid, glycolic acid and water with a mass ratio of 20:12:6:100 be made of.

Embodiment 3

[0065] The difference between the processing method of the pan head drilling screw of the present embodiment and the embodiment 2 is that in step 2), the mixed acid B is composed of oxalic acid, lactic acid, glycolic acid, polymerized acid with a mass ratio of 22:15:7:2.5:100 Prepared by mixing aluminum sulfate and water evenly.

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Abstract

The invention relates to the technical field of screw machining, and particularly discloses a pan head self-drilling screw and a machining method thereof. The machining method of the pan head self-drilling screw comprises the following steps that 1), a steel wire rod is subjected to wire drawing and annealing treatment, and then the steel wire rod is sequentially subjected to acid pickling and phosphating; the acid pickling comprises acid pickling by mixed acid A, water washing, drying and acid pickling by mixed acid B which are carried out in sequence, the mixed acid A is obtained by mixing hydrochloric acid and sulfuric acid, and the mixed acid B is obtained by mixing oxalic acid, lactic acid and water; phosphating is carried out by soaking in a phosphating solution, and the phosphating solution is obtained by mixing zinc dihydrogen phosphate and water according to the mass ratio of 5-8 to 100; 2), finish drawing, heading, tail clamping and thread rolling are carried out on the wire rod subjected to acid pickling and phosphating treatment to obtain a semi-finished product workpiece; and 3), preservative treatment is carried out on the obtained semi-finished product workpiece to obtain the pan head self-drilling screw. According to the machining method of the pan head self-drilling screw, the surface of the steel wire rod keeps good surface quality, and then the performance of the screw is improved.

Description

technical field [0001] The present application relates to the technical field of screw processing, and more specifically, it relates to a pan head drilling screw and a processing method thereof. Background technique [0002] As a fastener, screws are used in a wide range of applications. In different application fields, the performance requirements for screws are also different. Some application fields require screws to have good mechanical properties, and some application fields require screws to have good anti-corrosion properties. At present, many fields require screws to have longer service life and higher stability, which requires that screws not only have good mechanical properties, but also maintain good anti-corrosion properties in different environments. [0003] The mechanical properties and anti-corrosion properties of screws are not only related to the material of the screw itself, but also closely related to the processing technology and surface coating quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D9/52C21D1/26C23G1/08C23C22/07C25D5/36C23G1/19B23P15/00F16B35/00
Inventor 屠乾宏金志顺施碎正袁平
Owner SHANGHAI HONGTING FASTENER MFG CO LTD
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