Machining method of abnormal tubular product for lift control switch

A technology of elevator control and processing method, which is applied in the field of special-shaped pipe processing, can solve the problems of pipe materials that have not been seen in elevator control switches, and achieve the effects of meeting the requirements of industrialized enlarged production, reducing weight and simplifying the process flow

Inactive Publication Date: 2012-08-15
CHANGSHUSMLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the applicant has searched patents and non-patent literature extensively, but there is no technical information that can be processed into hollow pipes that are suitable for elevator control swit

Method used

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  • Machining method of abnormal tubular product for lift control switch
  • Machining method of abnormal tubular product for lift control switch

Examples

Experimental program
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Effect test

Example Embodiment

[0031] Example 1:

[0032] Take the processing cross-sectional area as 265.5mm 2 And shaped like figure 1 The shown elevator control switch uses special-shaped pipe as an example.

[0033] ) To prepare the materials, first select a steel round bar with a diameter of Ф50 mm and a grade of 20 produced by Jiangsu Huaiyin Iron and Steel Co., Ltd. In this embodiment, the cross-sectional area of ​​the shaped pipe for elevator control switch to be finally obtained is compared with The ratio of the cross-sectional area of ​​the steel round bar is 1:7.39, and the sawing length of the round bar is 820mm to obtain a round bar blank;

[0034] B) Heating, sending the round bar blank obtained in step A) into an inclined-bottom heating furnace to be heated to 1250°C, and out of the inclined-hearth furnace to obtain a round bar blank to be pierced;

[0035] C) Piercing, the round bar to be pierced obtained in step B) is introduced to a two-roll cross-rolling piercing machine and pierced into...

Example Embodiment

[0044] Example 2:

[0045] The figure is omitted, the processing cross-sectional area is 281.07mm 2 For example, special-shaped pipes are used for elevator control switches.

[0046] ) To prepare the materials, first select a steel round bar with a diameter of Ф50 mm and a grade of 20 produced by Jiangsu Huaiyin Iron and Steel Co., Ltd. In this embodiment, the cross-sectional area of ​​the shaped pipe for elevator control switch to be finally obtained is compared with The ratio of the cross-sectional area of ​​the steel round bar is 1:7, and the sawing length of the round bar is 820 mm to obtain a round bar blank.

[0024] ) Heating, sending the round bar blank obtained in step A) into an inclined-bottom heating furnace to be heated to 1250°C, and exiting the inclined-bottom furnace to obtain a round bar blank to be pierced;

C) Piercing, the round bar to be pierced obtained in step B) is introduced to a two-roll cross-rolling piercing machine and pierced into a 51×4.2 (outer...

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Abstract

The invention provides a machining method of an abnormal tubular product for a lift control switch and belongs to the technical field of machining of the abnormal tubular product. The machining process comprises the following steps of: sawing and cutting a steel circular rod to obtain a circular rod blank; conveying the circular rod blank into a heating furnace to be heated; perforating the circular rod blank on a perforating machine; hammering one end of a perforated tubular billet into a circular head; leading the tubular billet into an acid washing tank to be washed with an acid, and then washing the tubular billet with clean water, and washing by high-pressure water; leading the tubular billet which is subjected to the acid washing into a phosphorization tank to carry out phosphorization treatment and then washing with the clean water; leading a phosphorized tubular billet into a lubricating tank to carry out lubrication treatment; carrying out primary cold-drawing deformation and secondary cold-drawing deformation on the tubular billet on a cold-drawing machine; conveying a circular tube subjected to the cold drawing into a fuel gas type continuous annealing furnace to be continuously annealed; after changing the head of the annealed circular tube, carrying out cold-drawing abnormal deformation; and straightening an initial blank of the abnormal tube and cutting end heads at two ends to obtain the finished abnormal tubular product for the lift control switch. The machining method of the abnormal tubular product for the lift control switch has the advantages of simple process flow, capability of meeting the requirements of industrial amplification production, light weight and ideal material-saving effect.

Description

technical field [0001] The invention belongs to the technical field of processing special-shaped pipes, and in particular relates to a processing method for special-shaped pipes used for elevator control switches. Background technique [0002] The concept of special-shaped pipe mentioned above refers to that the cross-section of the pipe is a special-shaped hollow end face. The main metal elements of the special-shaped pipe material are carbon, manganese and silicon 20 (grade 20) steel round bar, and the special-shaped pipe is obtained by cold drawing after piercing. [0003] The elevator control switches in the prior art generally use special-shaped bars with a solid structure. This solid special-shaped bar has the following shortcomings: one is that the weight of the elevator control switch is increased due to the weight; Contrary to the conservation and energy-saving economic spirit advocated by the whole society at present; the third is the high price. [0004] In fact...

Claims

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Application Information

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IPC IPC(8): B21C37/15
Inventor 陆建国陈国强倪伟刚杜鹏
Owner CHANGSHUSMLESS STEEL TUBE
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