KR20160107958A

KR20160107958A - Dieless Drawing Apparatus for Forming Pipe and Method for Forming Pipe Using the Same

Info

Publication number: KR20160107958A
Application number: KR1020150031600A
Authority: KR
Inventors: 박준홍
Original assignee: 동아대학교 산학협력단
Priority date: 2015-03-06
Filing date: 2015-03-06
Publication date: 2016-09-19

Abstract

The present invention relates to a pipe pultrusion apparatus and a pultrusion method using the same, to perform numerical control without a mold after fitting a forming condition at a temperature suitable to deform a pipe or a rod material without using a mold in comparison with an existing drawing process, so as to form the pipe or rod material to a desired diameter within an elongation percentage range of the material while continuously reducing a diameter. According to the present invention, the apparatus comprises: a feeding unit installed to be able to horizontally reciprocate, so as to feed a pipe material to a rear side at a predetermined pitch; a drawing unit installed to be able to horizontally reciprocate in a rear side of the feeding unit, so as to continuously pull the pipe material to the rear side at a constant peed; and a heater to heat the pipe material at a predetermined temperature to control a diameter of the pipe material. The drawing unit controls a speed and force for pulling the pipe material to draw the pipe material without a mold while reducing the diameter.

Description

TECHNICAL FIELD [0001] The present invention relates to a pipe drawing-forming apparatus and a drawing forming method using the pipe drawing apparatus.

The present invention relates to a technique for drawing a pipe or a bar to a desired diameter and more particularly to a technique for drawing a pipe or a bar at a desired temperature at which a pipe or a bar is deformed without using a mold, To a pipe drawing or forming apparatus capable of forming a pipe or a bar into a desired diameter within a range of an elongation of a work piece while reducing the diameter of the pipe, and a drawing and forming method using the same.

Generally, a drawing process is a process of forming a rod, a line or a pipe having a section such as the shape or the size of a hole formed in the mold means by pressing a rod, a wire, In this method, mainly cold rolling is performed, and tungsten or molybdenum is drawn at high temperature.

The conventional drawing and forming apparatus includes a feeding means for feeding a raw material to be drawn, a feeding means for feeding the fed raw material to a position to be processed, a pressing means for pressing the raw material with a die means, A drawing means provided on the opposite side of the pressing means for allowing a raw material to pass through a hole of the die to produce a pipe or a bar and a pipe drawn out through the drawing means to outside And a discharging means for discharging.

However, since the conventional drawing and forming apparatus as described above controls the shape and dimensions by using a mold, it is necessary to use different molds depending on the shape and dimensions of the pipe, thereby increasing production costs and manufacturing time.

In addition, in the conventional pipe drawing forming process, there is also a problem that productivity and quality are deteriorated due to the use of drawing die and the post-heat treatment process.

Registration No. 10-1494441 (Feb. Registration Utility Model No. 20-0408829 (2006.08.08.)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a pipe or a bar without a mold, unlike a conventional drawing process, Which is capable of forming a pipe or a bar into a desired diameter within a range of the elongation of the material while reducing the diameter, and a method of drawing and forming using the same.

In accordance with another aspect of the present invention, there is provided a pipe drawing and forming apparatus including: a feeding unit installed horizontally reciprocatingly in the front and rear direction to feed a pipe material backward at a constant pitch; A drawing unit installed horizontally reciprocatingly on the rear side of the feeding unit and continuously drawing the pipe material backward at a constant speed; And a heater for heating the pipe material to a predetermined temperature in order to control the diameter of the pipe material. The drawer controls the speed and force for pulling the pipe material to draw the pipe material while reducing the diameter of the pipe material .

According to the present invention, there is no need of a drawing die and a post-heat treatment process used in conventional pipe draw-forming, so that it is possible to form a product with high productivity and high quality compared to existing processes.

In addition, it is possible to manufacture various sizes of products of various diameters than any conventional drawing method without manufacturing additional shaped molds, and it is possible to reduce the production time, production cost, and cost There is an effect that a product can be implemented.

1 is a view showing the construction of a pipe drawing and forming apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a pipe drawing and forming apparatus and a drawing and forming method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a pipe drawing and forming apparatus according to the present invention. The pipe drawing and forming apparatus according to the present invention includes a feeding device 1 for feeding a pipe material P backward at a constant pitch, a feeding unit; A drawing unit 2 installed horizontally reciprocatingly on the rear side of the feeding device 1 for continuously drawing the pipe material P backward at a constant speed; And a heating device (3) for heating the pipe material (P) to a predetermined temperature to control the diameter of the pipe material (P).

The feeding device 1 feeds the pipe material P at a constant pitch while horizontally reciprocating by a predetermined distance at a constant speed.

The drawer 2 functions to pull out the pipe material P while reducing the diameter of the pipe material P by controlling the speed and the force of pulling the pipe material P.

The heating unit 3 is configured to perform a function of heating the pipe material P to an appropriate set temperature for deformation. In this embodiment, the heating unit 3 includes a feeder 1 and a drawer 2 for heating the pipe material P by high-frequency induction heating.

The heating coils for high-frequency heating may be made of a single body, but a plurality of heating coils may be arranged at regular intervals along the longitudinal direction of the pipe material P. The heating coil for high-frequency heating may be formed with a cooling channel 4 through which a fluid such as air or water is supplied to the upper end thereof for cooling.

The pipe drawing and forming apparatus of the present invention having the above-described structure draws a pipe by the following method.

First, the feeding device 1 horizontally reciprocates in the front-rear direction, and horizontally feeds the pipe material P backward at a predetermined pitch. At this time, the heating device 3 heats the pipe material P to a set temperature suitable for deformation.

If the drawer 2 pulls the pipe material P backward at a predetermined speed and force in a state where the pipe material P is heated in the state where the pipe material P is heated, As the diameter decreases, the pipe is manufactured to a set diameter.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

1: Feeding machine 2: Drawing machine
3: Hitter 4: Cooling channel
P: Pipe material

Claims

A feeding unit 1 which is horizontally reciprocable in the front-rear direction and feeds the pipe material P backward at a constant pitch;
A drawing unit 2 installed horizontally reciprocally on the rear side of the feeding device 1 and continuously drawing the pipe material P backward at a constant speed;
And a heating device (3) for heating the pipe material (P) to a predetermined temperature to control the diameter of the pipe material (P)
Wherein the drawer (2) draws the pipe material (P) while reducing the diameter of the pipe material (P) by controlling the speed and force of pulling the pipe material.

The heating device according to claim 1, wherein the heating device (3) is disposed between the feeding device (1) and the drawer (2) so as to surround the outside of the pipe material (P) And a heating coil for heating.

The pipe drawing and forming apparatus according to claim 1, wherein a plurality of the heating coils for high frequency heating are arranged at regular intervals along the longitudinal direction of the pipe material (P).

The pipe drawing and forming apparatus according to claim 1, wherein the heating coil for high frequency heating has a cooling channel (4) to which a fluid for cooling is supplied at an upper end thereof.

A method of drawing and forming a pipe using the pipe drawing and forming apparatus according to any one of claims 1 to 4,
Feeding the pipe material (P) horizontally backward at a constant pitch while horizontally reciprocating the feeding device (1) in the forward and backward directions;
Heating the pipe material (P) to a set temperature suitable for deformation;
The drawing machine 2 draws the pipe material P rearward at a predetermined speed and force while continuously reducing the diameter of the pipe material P within the range of the elongation of the pipe material to manufacture the pipe with the set diameter Wherein the pipe-draw forming method comprises the steps of: