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Pin

A technology of pins and pin rods, which is applied in the direction of bolts, etc., can solve the problems of harsh use environment of pins, safety accidents, pin corrosion, etc., and achieve the effect of improving solid solution strengthening, avoiding cracking, and reducing adsorption

Active Publication Date: 2016-09-21
NINGBO YINZHOU HAISHENG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ordinary pins use common stainless steel materials, and the pins will be stressed during use, so there will be relatively high requirements for various mechanical properties of the pins, such as yield strength, tensile strength, elongation, etc. , but currently the pins are made of general-purpose stainless steel, which is easily damaged, and the use environment of the pins is generally relatively harsh, often exposed to water vapor, and also exposed to acidic or alkaline environments. Often in this environment, it will damage the pins Therefore, it is necessary to improve a pin with good mechanical properties and corrosion resistance to solve the existing technical problems

Method used

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Embodiment 6

[0047] The composition of this embodiment is the same as that of Embodiment 5, the difference is that the surface of this embodiment is galvanized, the thickness is 2 μm, and the roughness is 6.3 μm. The electroplating process is:

[0048] First pickle the pins for 10 minutes, soak them in acetone solution for 20 minutes, then wash them in clean water for 10 minutes, and dry them in the air;

[0049] Then activate the dried pin for 10 minutes with an activation solution, which is a mixed solution of molybdate with a concentration of 20g / L and 10g / L phosphoric acid;

[0050] Finally put the dried pin into the acidic electroplating solution, the temperature of the electroplating solution is 60° C., and electroplate for 20 minutes; Mixed solution; the pH value of the electroplating solution is 2, and the current density during electroplating is 16A / dm 2 ;

[0051] Remove pins, wash and tumble dry.

Embodiment 7

[0053] The composition of this embodiment is the same as that of Embodiment 5, except that the surface of this embodiment is galvanized, the thickness is 3 μm, and the roughness is 6.3 μm. Described electroplating process is:

[0054] After pickling the pins for 20 minutes, soak them in acetone solution for 20 minutes, then wash them in clean water for 10 minutes, and dry them in the air;

[0055] Then activate the dried pin for 10 minutes with an activation solution, which is a mixed solution of molybdate with a concentration of 40g / L and 20g / L phosphoric acid;

[0056] Finally put the dried pin into the electroplating solution, the temperature of the electroplating solution is 80°C, and the electroplating is carried out for 20 minutes; solution; the PH value of the electroplating solution is 4, and the current density during electroplating is 16A / dm 2 ;

[0057] Remove pins, wash and tumble dry.

Embodiment 8

[0059] The composition of this embodiment is the same as that of Embodiment 5, and the difference is that the surface of this embodiment is galvanized, the thickness is 2 μm, and the roughness is 5 μm. Described electroplating process is:

[0060] After pickling the pins for 15 minutes, soak them in acetone solution for 25 minutes, then wash them in clean water for 10 minutes, and dry them in the air;

[0061] Then, activate the dried pin for 10 minutes with an activation solution, which is a mixed solution of molybdate with a concentration of 30g / L and 15g / L phosphoric acid;

[0062] The pin after drying is put into electroplating bath, electroplating bath temperature 70 ℃, electroplating 20min; Described electroplating bath is the ZnSO of concentration 450g / l Sodium pyrophosphate of 100g / L, the sodium carbonate mixed solution of 6g / L; The pH value of the electroplating solution is 3, and the current density during electroplating is 18A / dm 2 ;

[0063] Remove pins, wash an...

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Abstract

The invention provides a pin. The pin comprises a pin head, a pin rod, a torsion rod and a curved-surface extrusion block. The pin is composed of the following ingredients in percentage by weight: 0.17-0.18% of C, 0.2-0.21% of Si, 0.2-0.3% of N, 0.54-0.55% of Mn, 0.012-0.014% of P, 0.006-0.007% of S, 0.01-0.011% of Ni, 0.02-0.03% of Cr, 0.02-0.022% of Cu, 0.23-0.25% of Ti, 0.3-0.5% of Nb, 0.1-0.2% of Ce, 0.1-0.2% of La and the balance Fe. The pin provided by the invention is more stable and reliable during location, high in structural strength, and capable of reducing the precipitation of chromium carbonitride; due to the addition of Nb and Ti, the effects of solution strengthening and precipitation strengthening are improved, and the mechanical properties are enhanced; the surface of the material is plated with Zn, thus the smoothness of the surface is improved, and the self-cleaning effect is enhanced; Ce and La are conducive to forming a compact, continuous, thick and high-adhesiveness spinel-type composite rust layer containing silicon-copper rare earth, thus the atmospheric corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of hardware accessories and relates to a pin. Background technique [0002] The pin is a commonly used hardware connector, which can be used for positioning or connection. It is fixed in the pin hole by interference fit. [0003] The patent application number is 201210128937.8 discloses a pin, which includes a pin body; the pin body includes a cylindrical part and a conical part; the central axes of the cylindrical part and the conical part are arranged in parallel; the The cylindrical part and the conical part are arranged tangentially and integrally; the upper end of the pin body is provided with a threaded hole. [0004] Ordinary pins use common stainless steel materials, and the pins will be stressed during use, so there will be relatively high requirements for various mechanical properties of the pins, such as yield strength, tensile strength, elongation, etc. , but currently the pins are made of gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/18C22C38/16C22C38/14C22C38/12C25D3/22C25D5/36F16B19/02
CPCC22C38/001C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C25D3/22C25D5/36F16B19/02
Inventor 李建忠
Owner NINGBO YINZHOU HAISHENG MACHINERY