Manufacturing method of screw

A technology for screws and screw blanks, which is applied in the processing field of alloy materials, can solve the problems of heavy weight, general quality, and high cost of materials, and achieve the effects of prolonging service life, improving strength, and good mechanical properties

Inactive Publication Date: 2016-03-02
NINGBO RUIER AUTO PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing screws are all made of integral metal structures, and there are still many problems, such as heavy weight, high cost of materials, wear resistance, hardness, rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc. , in many occasions can not meet the requirements of production, and further improvement is needed to improve production efficiency, reduce costs, improve safety, and prolong the service life of screws

Method used

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  • Manufacturing method of screw
  • Manufacturing method of screw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw materials with the composition and mass percentages in Example 1 in Table 1 were weighed respectively to make steel products.

[0028] The steel is first subjected to isothermal normalizing treatment. The temperature of isothermal normalizing treatment is 950°C, and the temperature is kept for 200 minutes. Carbon treatment and tempering treatment, the carburizing treatment is to first raise the temperature to 910°C, keep it for 70min, then drop it to 900°C, keep it for 30min, then drop it to 840°C, keep it for 20min, and finally air cool to room temperature; The treatment temperature is 180°C, and the tempering treatment time is 100min.

[0029]The screw blanks are degreased and derusted sequentially (the temperature of degreasing and derusting treatment is 50°C, the treatment time is 5min, and the treatment liquid used is: thiourea 3.5g / L, sodium dihydrogen phosphate 3g / L, OP- 1012ml / L), activation treatment (the treatment liquid that activation treatment adop...

Embodiment 2

[0031] Weigh the raw materials with the composition and their mass percentages as shown in Table 1, Example 2, respectively, to make steel products.

[0032] The steel is first subjected to isothermal normalizing treatment. The temperature of isothermal normalizing treatment is 945°C, and the heat preservation time is 210min. Carbon treatment and tempering treatment, the carburizing treatment is to first raise the temperature to 895 ° C, keep it for 85 minutes, then drop it to 885 ° C, keep it for 45 minutes, then drop it to 825 ° C, keep it for 35 minutes, and finally air cool to room temperature; The treatment temperature is 155° C., and the tempering treatment time is 130 minutes.

[0033] The screw blanks are degreased and derusted sequentially (the temperature of degreasing and derusting treatment is 35°C, the treatment time is 8min, and the treatment liquid used is: thiourea 2.8g / L, sodium dihydrogen phosphate 7g / L, OP- 106ml / L), activation treatment (the treatment liqu...

Embodiment 3

[0035] Weigh the raw materials with the composition and mass percentages in Example 3 in Table 1, respectively, to make steel products.

[0036] The steel is first subjected to isothermal normalizing treatment. The temperature of isothermal normalizing treatment is 940°C, and the heat preservation time is 225 minutes. Carbon treatment and tempering treatment, the carburizing treatment is to first raise the temperature to 900°C, hold for 80min, then drop to 890°C, hold for 40min, then drop to 830°C, hold for 30min, and finally air cool to room temperature; The treatment temperature is 160° C., and the tempering treatment time is 120 minutes.

[0037] The screw blanks are degreased and derusted sequentially (the temperature for degreasing and derusting treatment is 40°C, the treatment time is 8min, and the treatment liquid used is: thiourea 3.0g / L, sodium dihydrogen phosphate 6g / L, OP- 108ml / L), activation treatment (the treatment liquid that activation treatment adopts is: nit...

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Abstract

The invention relates to a manufacturing method of a fastener, in particular to a manufacturing method of a screw, and belongs to the machining field of alloy materials. The manufacturing method of the screw comprises the steps that a screw blank is obtained by sequentially conducting normalizing treatment, machining and heat treatment on steel; the heat treatment involves carburizing treatment and tempering treatment, and during carburizing treatment, the temperature is firstly increased to 890-910 DEG C, preserved for 70-90 min, then decreased to 880-900 DEG C, preserved for 30-50 min, decreased to 820-840 DEG C, preserved for 20-40 min, and finally decreased to the room temperature through air cooling; the tempering treatment temperature is 150-180 DEG C, and the tempering treatment time is 100-140 min; and the finished screw can be obtained by sequentially conducting oil and rust removal, activating treatment, blackening and passivating treatment on the screw blank. After carburizing treatment is conducted on the screw alloy steel, the screw is provided with a hard and abrasion-resistant surface and a tough core and has high low-temperature impact toughness and good machinability; through surface blackening, the mechanical property of the screw is further improved, the Rockwell hardness (HRC) of the screw reaches 58-63, the layer depth of the screw is 0.7-1.0, and the service life of the screw is greatly prolonged.

Description

technical field [0001] The invention relates to a method for preparing a fastener, in particular to a method for preparing a screw, and belongs to the field of processing alloy materials. Background technique [0002] Fasteners are also called standard parts in the market, which is a general term for a type of mechanical parts used when two or more parts (or components) are fastened and connected into a whole. It is characterized by a wide variety of specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. Fasteners are the most widely used mechanical basic parts and are in great demand. Commonly used fasteners include bolts, screws, and the like. [0003] Screws are the kind with a pointed head at the front end and a large pitch. They are generally used to fasten wooden and plastic parts. They are commonly used in machinery, electrical appliances and buildings. They are generally made of metal and are cylind...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C21D1/28C23C8/22C23C22/40
Inventor 任鹏坤
Owner NINGBO RUIER AUTO PARTS CO LTD
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