Preparation process of cold-drawn lamp post and prepared lamp post

A preparation process and cold drawing technology, which is applied in the field of outdoor intelligent lighting carrier and outdoor public equipment production process, can solve the problems of difficult production, high product defective rate, and inapplicability of large-diameter light poles, etc., and achieve fast processing and forming speed , high output, and improved manufacturing accuracy

Pending Publication Date: 2020-12-11
ZHEJIANG JINGRI LIGHTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not suitable for large-diameter light poles, and with the increasing demand for special-shaped light poles in the market, the existing technology is especially difficult to produce large-diameter special-shaped light poles, and the defective rate of products is too high

Method used

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  • Preparation process of cold-drawn lamp post and prepared lamp post

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation process for a cold-drawn light pole. The cross-section of the light pole is circular, the diameter is 245 mm, and the wall thickness is 5 mm. The specific preparation steps are as follows:

[0040](1) Stress-relief annealing: introduce the tube blank into the heating furnace to heat and keep it warm, and then release it after cooling with the furnace to obtain annealed tube blank. The purpose is to ensure the strength of the steel pipe. When the annealing temperature is too high, the processing strain will recover and cannot be obtained. The effect of work hardening, the annealing temperature is 450°C, the effect of work hardening can be obtained, in order to remove the strength deviation of the cold-rolled steel pipe, the holding time of the cold-rolled steel pipe in the furnace is 20 minutes;

[0041] (2) Sharpening: the annealed tube billet is sharpened, so that the diameter of the end of the tube billet shrinks after being extruded by the extrusion die....

Embodiment 2

[0053] A preparation process for a cold-drawn light pole. The cross-section of the light pole is a regular hexagon, one side has a concave structure, the diameter is 300 mm, and the wall thickness is 8 mm. The specific preparation steps are as follows:

[0054] (1) Stress-relief annealing: introduce the tube blank into the heating furnace to heat and keep it warm, and then release it after cooling with the furnace to obtain annealed tube blank. The purpose is to ensure the strength of the steel pipe. When the annealing temperature is too high, the processing strain will recover and cannot be obtained. The effect of work hardening, the annealing temperature is 700°C, the effect of work hardening can be obtained, in order to remove the strength deviation of the cold-rolled steel pipe, the holding time of the cold-rolled steel pipe in the furnace is 30 minutes;

[0055] (2) Sharpening: the annealed tube billet is sharpened, so that the diameter of the end of the tube billet shrink...

Embodiment 3

[0065] A preparation process for a cold-drawn light pole. The cross-section of the light pole is a regular heptagon, each side has a convex structure, the diameter is 400mm, and the wall thickness is 10mm. The specific preparation steps are as follows:

[0066] (1) Stress-relief annealing: introduce the tube blank into the heating furnace to heat and keep it warm, and then release it after cooling with the furnace to obtain annealed tube blank. The purpose is to ensure the strength of the steel pipe. When the annealing temperature is too high, the processing strain will recover and cannot be obtained. The effect of work hardening, the annealing temperature is 550°C, the effect of work hardening can be obtained, in order to remove the strength deviation of the cold-rolled steel pipe, the holding time of the cold-rolled steel pipe in the furnace is 20 minutes;

[0067] (2) Sharpening: the annealed tube billet is sharpened, so that the diameter of the end of the tube billet shrink...

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Abstract

The invention relates to a preparation process of a cold-drawn lamp post and the prepared lamp post. The preparation process comprises an annealing step, a pinching step, a cold-drawing pretreatment step and a cold-drawing step, wherein the annealing temperature adopted in the annealing step is 450-700 DEG C; and in the pinching step, the outer diameter of the end of a pipe blank is reduced to 10%-18% of the original diameter. According to the preparation process of the cold-drawn lamp post and the prepared lamp post, the machining and forming speed is high, the yield is high, the surface is not damaged during cold drawing, various lamp posts of different specifications can be manufactured so as to meet the machining requirements of customers, the wall thickness ranges from 4 mm to 30 mm,and the pipe diameter ranges from 100 mm to 500 mm. A product of which the size is not within the range of a conventional cold-drawn steel pipe standard product can be obtained. The manufacturing precision is obviously improved, the precision of the outer diameter and the inner diameter of the cold-drawn lamp post can be guaranteed, the maximum eccentricity ratio is 5%, the size precision reachesH10-H8, the straightness reaches 1/500 or below, and the surface roughness is smaller than Ra12.

Description

technical field [0001] The invention belongs to the field of outdoor smart lighting carrier and outdoor public equipment production process, and relates to a preparation process of a cold-drawn light pole and the prepared light pole. Background technique [0002] With the vigorous development of the country's economic construction, the level of social public infrastructure is gradually improving. As the main lighting tool at night, street lamps have received more and more attention on their use effect and service life. According to the actual terrain and other factors, the quality of the street lamp poles supporting street lamps is particularly critical. Therefore, the material and preparation process of street lamp poles basically determine its quality. At present, most of the traditional light pole production adopts processes such as: plate rolling machine flattening→rolling cutting→large bending machine coiling→automatic submerged arc welding seam→mechanical rounding, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D1/26C21D9/08B21C1/22B21C5/00F21S8/08
CPCB21C1/22B21C5/003B23P15/00C21D1/26C21D9/08F21S8/085
Inventor 程世友钱利杰蒋惠梁潘靖琪
Owner ZHEJIANG JINGRI LIGHTING TECH
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