CN104175066A

CN104175066A - Axial pushing-in gathering and upsetting composite process of ultralong pipe head flange

Info

Publication number: CN104175066A
Application number: CN201410319908.9A
Authority: CN
Inventors: 赵升吨; 朱骏; 张琦; 崔敏超; 陈超; 景飞
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2014-07-07
Filing date: 2014-07-07
Publication date: 2014-12-03
Anticipated expiration: 2034-07-07
Also published as: CN104175066B

Abstract

The invention relates to an axial pushing-in gathering and upsetting composite process of an ultralong pipe head flange. The process comprises the following steps of first heating a pipe preform body and preheating an inner mold and an outer mold, clamping the pipe, driving the pipe to be fed at a constant speed through a clamp, keeping the inner mold still, beginning to expand the diameter of the end part of the pipe under the effect of an inner mold circular truncated cone to form a flare shape, facilitating the inner mold and the pipe to move in the same direction at a given speed, filling the cavity with the pipe with the end part being continuously and plastically deformed to achieve a gathering purpose, replacing the inner mold and the outer mold after the gathering is completed, driving the inner mold to move in an opposite direction at an appropriate speed, deforming the pipe preform body to complete the upsetting step, and finally fully filling the cavity to acquire the needed head flange shape. The entire process is simple, the traditional welding structure is substitute, so that the quality and performance of the prepared pipe is good, the production efficiency is high, and environmental friendliness can be realized. The gathering and upsetting process can be continuously realized, the pipe can be formed in one step after being clamped, and the efficiency is high.

Description

Axially pushing of a kind of ultra-long tube head flanges gathers material and jumping-up combination process

Technical field

The invention belongs to metal forming technical field, be specifically related to the poly-material of axially pushing of a kind of ultra-long tube head flanges and jumping-up combination process.

Background technology

The Pneumatic brake systems of railway freight-car is most important for the traffic safety of lorry, the connected mode of its braking pipe arrangement has largely determined the quality of brakes, in piping connected mode, flange is connected to most widely used general and the most ripe scheme, traditional flange connection is that fittings body is welded on to stainless steel piping two ends, flange is enclosed within on fittings body, use again bolted flange, but this mode exists a lot of weak points, for example, welding between fittings body and pipe fitting can cause environmental pollution, the quality of welding is bad in addition easily causes crackle and leakage, even rupture, having a strong impact on traffic safety, so, a kind of new Integral flange pipe must become development trend, and the moulding process of pipe fitting head flanges is the key technology of this Integral flange pipe, also there is no at present this moulding process.

Summary of the invention

In order to overcome the shortcoming of above-mentioned connected mode, the object of the invention is to propose the poly-material of axially pushing of a kind of ultra-long tube head flanges and jumping-up combination process, cancelled the Welding Structure of fittings body, thereby can ensure quality of connection, and production efficiency is high, environmental protection.

To achieve these goals, the technical scheme that the present invention takes is:

Axially pushing of ultra-long tube head flanges gathers material and a jumping-up combination process, comprises the following steps:

1) for metal tube blank 4, use induction heating apparatus 2 also carries out preheating to outer mold 1 and inner mold 5 more than one end of pipe fitting blank 4 required processing is heated to recrystallization temperature, and preheat temperature is 350～450 DEG C;

2) pipe fitting blank 4 right-hand members that heated are clamped by fixture 3, and the while is with the speed V of 8mm/s～12mm/s ₁along axial feed, now outer mold 1 and inner mold 5 maintain static, and pipe fitting blank 4 is under the effect of inner mold 5 right-hand member taper seats, and enlarged-diameter, forms horn-like;

3), when pipe fitting blank 4 is about to fill up die cavity, inner mold 5 starts to be less than speed V ₁speed V ₂to left movement, speed V ₁and V ₂according to definite velocity ratio, just to fill full die cavity with blank and be as the criterion, meanwhile, pipe fitting blank 4 still clamps through fixture 3 feeding that remains a constant speed, and plastic deformation constantly occurs, and progressively fills die cavity;

4) inner mold 5 reaches after predefined displacement to left movement, stops the motion of inner mold 5 and fixture 3, this displacement make poly-material volume equal will moulding flange volume, complete the object of poly-material;

5) position of maintenance pipe fitting blank 4, changes inner mold 5, outer mold 1, and inner mold 5 is with the speed V of 4mm/s～6mm/s ₃move right, fixture 3 and pipe fitting blank 4 keep fixing, complete the step of jumping-up, make blank form required head flanges shape;

6) outer mold 1 and fixture 3 are removed half after machining, inner mold 5 is taken out, can obtain the pipe fitting of machine-shaping.

The present invention has the following advantages:

One, technique is simple, and cancel the fittings body structure of welding on original pipe fitting, thereby greatly improved pipe fitting quality, and environmental protection.

Two, can realize continuously poly-material and upsetting process, compare the poly-material technological requirement that can meet different materials by control rate.

Brief description of the drawings

Fig. 1 is the pipe fitting flange end geomery that needs shaping.

Fig. 2 is pipe fitting clamping schematic diagram before processing.

Fig. 3 is the first stage schematic diagram of poly-material work step.

Fig. 4 is the second stage schematic diagram of poly-material work step.

Fig. 5 is the jumping-up processing step schematic diagram after outer mold in changing.

Fig. 6 is the schematic diagram that technique completes.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is described in detail.

1) for metal tube blank 4, the pipe fitting end shape being shaped as shown in Figure 1, use induction heating apparatus 2 also carries out preheating to outer mold 1 and inner mold 5 more than one end of pipe fitting blank 4 required processing is heated to recrystallization temperature, and preheat temperature is 350～450 DEG C;

2) with reference to Fig. 2, pipe fitting blank 4 right-hand members that heated are clamped by fixture 3, and the while is with the speed V of 8mm/s～12mm/s ₁along axial feed, now outer mold 1 and inner mold 5 maintain static, and pipe fitting blank 4 is under the effect of inner mold 5 right-hand member taper seats, and enlarged-diameter, forms horn-like;

3) as shown in Figure 3,, when pipe fitting blank 4 is about to fill up die cavity, inner mold 5 starts to be less than speed V ₁speed V ₂to left movement, speed V ₁with speed V ₂according to definite velocity ratio, just to fill full die cavity with blank and be as the criterion, meanwhile, pipe fitting blank 4 still clamps through fixture 3 feeding that remains a constant speed, and plastic deformation constantly occurs, and progressively fills die cavity;

4) as shown in Figure 4, inner mold 5 is to the motion that stops inner mold 5 and fixture 3 after left movement reaches predefined displacement, this displacement make poly-material volume equal will moulding flange volume, complete the object of poly-material;

5) as shown in Figure 5, keep the position of pipe fitting blank 4, change inner mold 5, outer mold 1, inner mold 5 is with the speed V of 4mm/s～6mm/s ₃move right, fixture 3 and pipe fitting blank 4 keep fixing, complete the step of jumping-up, make blank form required head flanges shape, as shown in Figure 6;

Claims

1. axially pushing of ultra-long tube head flanges gathered material and a jumping-up combination process, it is characterized in that, comprises the following steps:

1) for metal tube blank (4), more than one end of the required processing of pipe fitting blank (4) is heated to recrystallization temperature by use induction heating apparatus (2), outer mold (1) and inner mold (5) are also carried out to preheating, and preheat temperature is 350～450 DEG C;

2) pipe fitting blank (4) right-hand member heating is clamped by fixture (3), and the while is with the speed V of 8mm/s～12mm/s ₁along axial feed, now outer mold (1) and inner mold (5) maintain static, and pipe fitting blank (4) is under the effect of inner mold (5) right-hand member taper seat, and enlarged-diameter, forms horn-like;

3), when pipe fitting blank (4) is about to fill up die cavity, inner mold (5) starts to be less than speed V ₁speed V ₂to left movement, speed V ₁and V ₂according to definite velocity ratio, just to fill full die cavity with blank and be as the criterion, meanwhile, pipe fitting blank (4) still clamps through fixture (3) feeding that remains a constant speed, and plastic deformation constantly occurs, and progressively fills die cavity;

4) inner mold (5) is to the motion that stops inner mold 5 and fixture 3 after left movement reaches predefined displacement, this displacement make poly-material volume equal will moulding flange volume, complete the object of poly-material;

5) position of maintenance pipe fitting blank (4), changes inner mold (5), outer mold (1), and inner mold (5) is with the speed V of 4mm/s～6mm/s ₃move right, it is fixing that fixture (3) and pipe fitting blank (4) keep, and completes the step of jumping-up, makes blank form required head flanges shape;

6) outer mold (1) and fixture (3) are half-and-half removed after machining, inner mold (5) is taken out, can obtain the pipe fitting of machine-shaping.