CN206046677U - A kind of cold-drawing-pipe device - Google Patents

Abstract

The utility model discloses a kind of cold-drawing-pipe device, including inner mold, outer mold, nut, core bar and rear plug, the outer mold is placed on the outer surface of the core bar, the inner mold is arranged on one end of the core bar, and be connected with the nut, the rear plug is placed on the other end of the core bar and encloses outward the core bar.Inner mold, outer mold, core bar and rear plug with the steel pipe central coaxial line for needing cold-drawn, be easy to be aligned draw steel pipe, improve degree of accuracy.This utility model effectively limits the radially travelling amplitude in steel pipe of core bar in process of tube plug drawing mill, so as to prevent or reduce the expansion of wall thickness deviation, improves the qualification rate of product.

Description

A kind of cold-drawing-pipe device

【Technical field】

This utility model is related to steel pipe's production equipment technical field, more particularly to a kind of cold-drawing-pipe device.

【Background technology】

In traditional cold-drawing-pipe device core bar and inner mold be integrally fixed at steel pipe center position it is motionless, but in reality In process of tube plug drawing mill, due to inequalities such as thickness of steel pipe size, concentricity, linearitys, cause core bar and internal model pipe diameter to It is travelling so that the same section wall thickness deviation of steel pipe expands, and tube bending degree increases, bend excessive steel pipe and enter the external mold current political situation Portion's stress is excessive, and crooked position cannot normally enter external mold, causes crooked position wall thickness to increase, or even fracture.Core bar and internal model Travelling amplitude is bigger, and the cold-drawn quality of steel pipe is poorer.For example：The regular appearance in draw Φ 356*8 (external diameter * wall thickness) steel pipe The wall thickness deviation of local 1m or so is big or the problem of crackle, causes steel pipe to be scrapped.

【Utility model content】

In view of this, to overcome the deficiencies in the prior art, this utility model provides a kind of cold-drawing-pipe device, in original base On set up rear plug, effectively limit the radially travelling amplitude in steel pipe of in process of tube plug drawing mill core bar, so as to preventing or reducing The expansion of wall thickness deviation, improves the qualification rate of product.

For achieving the above object, the technical solution of the utility model is as follows：

A kind of cold-drawing-pipe device, including inner mold, outer mold, nut, core bar and rear plug, the outer mold are placed on described The outer surface of core bar, the inner mold are arranged on one end of the core bar, and are connected with the nut, the rear plug set In the core bar the other end and enclose outward the core bar, reduce the radially travelling gap of the core bar.

Preferably, the inner mold, outer mold, core bar and rear plug with the steel pipe central coaxial line for needing cold-drawn, just In alignment draw steel pipe, degree of accuracy is improved.

Further, the afterbody of the rear plug is provided with step, it is to avoid in process of tube plug drawing mill all push the rear plug Need to take out in the steel pipe of cold-drawn.

During use, it would be desirable to which the steel pipe of cold-drawn is at the uniform velocity pushed to be installed in the cold-drawing-pipe device for fixing, in inner mold and outward Molding under the extruding of mould, reaches the steel pipe sizes of needs；Meanwhile, core bar is remained under the guide-localization of rear plug and steel Tube hub coaxial line, it is ensured that the Forming Quality of steel pipe.

The beneficial effects of the utility model are, by the rear stopper structure for designing, effectively to limit in process of tube plug drawing mill SMIS The radially travelling amplitude in the steel pipe for need cold-drawn of bar, so as to prevent or reduce the expansion of wall thickness deviation, improves product Qualification rate.

【Description of the drawings】

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.

Sectional views of the Fig. 1 for this utility model structure.

In figure, 1, nut, 2, inner mold, 3, outer mold, 4, steel pipe, 5, core bar, 6, rear plug, 7, step.

【Specific embodiment】

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only this utility model a part of embodiment, rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of this utility model protection.

With reference to Fig. 1, a kind of cold-drawing-pipe device, including inner mold 2, outer mold 3, nut 1, core bar 5 and rear plug 6 are described Outer mold 3 is placed on the outer surface of the core bar 5, and the inner mold 2 is arranged on one end of the core bar 5, and is connected with the nut 1 Fixation is connect, the rear plug 6 is placed on the other end of the core bar 5 and encloses outward the core bar 5, reduce the core bar 5 in steel pipe 4 The travelling gap of interior radial direction.

The inner mold 2, outer mold 3, core bar 5 and rear plug 6 and 4 central coaxial line of the steel pipe, in process of tube plug drawing mill Core bar 5 is remained under the positioning of rear plug 6 and 4 central coaxial line of steel pipe, so as to prevent or reduce the expansion of wall thickness deviation Greatly, improve the qualification rate of product.

Described 6 one end of rear plug is provided with step 7, it is to avoid the rear plug 6 is pushed the steel all in process of tube plug drawing mill Cannot take out in pipe 4.

This utility model when in use, inner mold 2 is placed on one end of the outer surface of core bar 5, loads onto nut 1, will be described Inner mold 2 and the connection fastening of core bar 5, then the inner mold 2 after fastening, core bar 5 and nut 1 are inserted the inside of the steel pipe 4, together When make the core bar 5 through the outer mold 3, on the other end set of 5 outer surface of core bar after plug 6, and by the rear plug 6 The inside of the steel pipe 4 is inserted, in process of tube plug drawing mill, promotion needs the steel pipe 4 of draw, and the steel pipe 4 is in inner mold 2 and external mold Molding under the extruding of tool 3, reaches the steel pipe sizes of needs；Meanwhile, core bar 5 remain under the guide-localization of rear plug 6 with 4 central coaxial line of steel pipe, it is ensured that the Forming Quality of steel pipe 4.

This utility model effectively limits core bar radial direction in steel pipe in process of tube plug drawing mill by the application of rear stopper structure Travelling amplitude, so as to prevent or reduce the expansion of wall thickness deviation, improves the qualification rate of product.

Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc. should be included in this utility model Protection domain within.

Claims (3)

1. a kind of cold-drawing-pipe device, it is characterised in that including inner mold, outer mold, nut, core bar and rear plug, the external mold Tool is placed on the outer surface of the core bar, and the inner mold is arranged on one end of the core bar, and is connected with the nut, institute State rear plug to be placed on the other end of the core bar and enclose outward the core bar.

2. a kind of cold-drawing-pipe device according to claim 1, it is characterised in that the inner mold, outer mold, core bar and after Plug with the steel pipe central coaxial line for needing cold-drawn.

3. a kind of cold-drawing-pipe device according to claim 1, it is characterised in that the afterbody of the rear plug is provided with step.