Method for manufacturing high-strength screws with fine threads for wind-driven generator foundations

A technology of wind power generator and manufacturing method, which is applied in the field of manufacturing high-strength screw with fine thread, which can solve the problems of large calorific value, unstable forming, and difficult to dissipate, so as to reduce resistance, improve extrusion efficiency and extrusion stability sexual effect

Inactive Publication Date: 2013-09-11
湖北德克特种异型高强螺栓有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems in the existing high-strength screw thread cold extrusion forming: the heat generated by continuous extrusion is large and difficult to dissipate, the large-length workpiece is easy to rotate, the extrusion efficiency is low and the forming is unstable, the present invention aims to provide a fast heat dissipation , Manufacturing method of high-strength screw with high extrusion forming efficiency and good stability

Method used

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  • Method for manufacturing high-strength screws with fine threads for wind-driven generator foundations
  • Method for manufacturing high-strength screws with fine threads for wind-driven generator foundations
  • Method for manufacturing high-strength screws with fine threads for wind-driven generator foundations

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Embodiment Construction

[0035] One embodiment of the manufacturing method of the high-strength screw of the present invention will be described in detail below.

[0036] attached figure 1 middle: d h —diameter of base circle, d v —base circle diameter, h—thread height, b—thread bottom width, l—thread pitch, R—thread root arc, α—lead angle;

[0037] attached figure 2 Middle: d—diameter of outer circle, d 2 —pitch diameter, d 3 —Minor diameter, R1—outer diameter fillet radius, R2—thread root angle radius, P—thread pitch, h3—thread height;

[0038] attached image 3 Middle: outer diameter d, middle diameter d 2 , base circle diameter d 1 , Lead angle α, thread height h=2mm, pitch P=8.45mm, outer diameter fillet radius R≤0.25mm, thread root angle radius R≤0.5mm, thread bottom width b=5.5mm.

[0039] see image 3 , the thread of the fine-threaded high-strength screw for the foundation of the wind power generator in the embodiment of the present invention is a fine-pitched trapezoidal thread, an...

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Abstract

The invention discloses a method for manufacturing high-strength screws for wind-driven generator foundations. The method includes steps of cutting selected steel materials into blanks with proper lengths according to requirements; straightening the blanks; performing medium-frequency induction heat treatment on the blanks; performing ultrasonic flaw detection and eddy current flaw detection on the blanks; rolling each workpiece by a cold extrusion thread rolling machine with two parallel annular thread rolling cylindrical dies to form continuous fine threads in the workpiece. The method for manufacturing the high-strength screws for the wind-driven generator foundations has the advantages that the thread rolling efficiency is high, the thread rolling stability is good, the fine threads rolled by the method are high in bearing capacity and good in self-locking property, and strength requirements of operation of wind-driven generators are met.

Description

technical field [0001] The invention relates to a processing method of a screw used for multi-component connection, in particular to a manufacturing method of a fine-threaded high-strength screw applied to the foundation of a wind power generator. Background technique [0002] As a clean and renewable resource, wind energy has been paid more and more attention by countries all over the world. Both at home and abroad attach great importance to the use of wind power to generate electricity and develop new energy sources. The devices required for wind power generation are called wind turbines. When the wind turbine is working, the rotation of the wind rotor will generate a large axial force, bending moment and horizontal load. Therefore, when the fan foundation is installed, the technical requirements for the bolts connecting the fan frame and various components are relatively high. [0003] The screw rod passes through the through hole on the component and then cooperates wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H3/06
Inventor 华成仁周祖宏石飞鹏肖红卫袁洪林欧强
Owner 湖北德克特种异型高强螺栓有限公司
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