CN105642687A - Cold-drawing technology of steel pipes - Google Patents

Abstract

The invention discloses a cold-drawing technology of steel pipes. The technology comprises steps as follows: 1), drawing technology parameters are determined as follows: when finished pipe product specifications less than phi159 are drawn, the drawing reduction does not exceed 10 mm once and the wall reduction does not exceed 2 mm, and when finished pipe product specifications more than phi159 are drawn, the drawing reduction does not exceed 12 mm once and the wall reduction does not exceed 2 mm; 2) for the specifications less than phi159, the empty drawing amount does not exceed 15 mm, and for the specifications more than phi159, the empty drawing amount does not exceed 20 mm once; for reaming, the reaming amount does not exceed 20 mm once for the specifications less than phi159, and the reaming amount does not exceed 35 mm once for the specifications more than phi159; 3) during cold-drawing, the cold-drawing speed is required to be controlled reasonably; during empty drawing, the drawing speed is at the third gear, that is, 5-6 m/min; when the reduction is less than 5 mm or the wall reduction is less than 1 mm, the drawing speed is at the second gear, that is, 2-3 m/min; when the reduction is in the range of 5-10 mm or the wall reduction is in the range of 1-2 mm, the drawing speed is at the first gear, that is, 1-2 m/min. According to the technology, all parameters are matched reasonably and harmoniously, and the production efficiency can be improved effectively.

Description

A kind of cold-drawing technology of steel pipe

Technical field

The present invention relates to the cold-drawing technology of a kind of steel pipe.

Background technology

The cold-drawing technology of existing steel pipe exists that procedure arrangement is unreasonable, operation is various, and technological parameter selects unreasonable, and the collocation of each technological parameter is unreasonable and operator's skill requirement is higher so that production cost is higher, product quality is on the low side, yield rate is not high.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved be to provide a kind of operation rationally, the cold-drawing technology of the steel pipe of low cost of manufacture.

For achieving the above object, the invention provides

The cold-drawing technology of a kind of steel pipe, comprises the steps:

1), the determination of drawing process parameter: pulling out the production tube specification of �� less than 159, its draw sizing reduction is once less than 10mm, and wall amount, less than 2mm, pulls out the production tube specification of �� more than 159, and its draw sizing reduction is once less than 12mm, and wall thickness reducing amount is less than 2mm;

2), for empty sinking draw amount �� less than 159 less than 15mm, pull out �� 159 with the last time less than 20mm, for reaming, expand �� less than 159 specification once less than 20mm, expand �� more than 159 specification once less than 35mm;

3), when cold-drawn, conservative control cold-drawn rotating speed is answered; When sky draws, draw speed at 3 grades, i.e. 5 ~ 6m/min; Sizing reduction at below 5mm or wall thickness reducing amount when below 1mm, draw speed at 2 grades, i.e. 2 ~ 3m/min; Sizing reduction at 5 ~ 10mm or wall thickness reducing amount when 1 ~ 2mm, draw speed at 1 grade, i.e. 1 ~ 2m/min.

The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to be effectively improved product quality and production efficiency.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

The cold-drawing technology of a kind of steel pipe, comprises the steps:

1), the determination of drawing process parameter: pulling out the production tube specification of �� less than 159, its draw sizing reduction is once less than 10mm, and wall amount, less than 2mm, pulls out the production tube specification of �� more than 159, and its draw sizing reduction is once less than 12mm, and wall thickness reducing amount is less than 2mm;

2), for empty sinking draw amount �� less than 159 less than 15mm, pull out �� 159 with the last time less than 20mm, for reaming, expand �� less than 159 specification once less than 20mm, expand �� more than 159 specification once less than 35mm;

3), when cold-drawn, conservative control cold-drawn rotating speed is answered; When sky draws, draw speed at 3 grades, i.e. 5 ~ 6m/min; Sizing reduction at below 5mm or wall thickness reducing amount when below 1mm, draw speed at 2 grades, i.e. 2 ~ 3m/min; Sizing reduction at 5 ~ 10mm or wall thickness reducing amount when 1 ~ 2mm, draw speed at 1 grade, i.e. 1 ~ 2m/min.

Claims (1)

1. a cold-drawing technology for steel pipe, is characterized in that: comprise the steps:

1), the determination of drawing process parameter: pulling out the production tube specification of �� less than 159, its draw sizing reduction is once less than 10mm, and wall amount, less than 2mm, pulls out the production tube specification of �� more than 159, and its draw sizing reduction is once less than 12mm, and wall thickness reducing amount is less than 2mm;

2), for empty sinking draw amount �� less than 159 less than 15mm, pull out �� 159 with the last time less than 20mm, for reaming, expand �� less than 159 specification once less than 20mm, expand �� more than 159 specification once less than 35mm;

3), when cold-drawn, conservative control cold-drawn rotating speed is answered; When sky draws, draw speed at 3 grades, i.e. 5 ~ 6m/min; Sizing reduction at below 5mm or wall thickness reducing amount when below 1mm, draw speed at 2 grades, i.e. 2 ~ 3m/min; Sizing reduction at 5 ~ 10mm or wall thickness reducing amount when 1 ~ 2mm, draw speed at 1 grade, i.e. 1 ~ 2m/min.