CN102861858A - Forging technology for pipe fitting with flanges at two ends - Google Patents

Abstract

The invention relates to a forging technology for a pipe fitting with flanges at two ends. The forging technology comprises the following steps: manufacturing a pipe blank; forging the pipe blank on a horizontal hydraulic press through a core bar and a model ring in a jacking and extending way; reserving a section of pipe blank for forming one end flange, and initially forging the pipe blank with one end flange; carrying out flame cutting to remove bottom end of the pipe blank and abandoned material at the flange end; locally heating the other end of the pipe blank on a vertical hydraulic press with a local device; and pressing and upsetting another end flange of the pipe blank on the vertical hydraulic press with a flange upsetting device. The pipe fitting manufactured by the invention has little follow-up working allowance for the appearance, so that materials are saved, the manufacturing period is shortened and the manufacturing cost is reduced. At the same time, with the adoption of the flange forging forming method combining die forging and forming die forging, whole continuousness for metal fibre of the pipe fitting is ensured and the whole strength requirements on the pipe fitting are met.

Description

There is the Forging Technology of the pipe fitting of flange at two ends

Technical field

The present invention relates to a kind of two ends has the Forging Technology of the pipe fitting of flange.

Background technology

The flanged (FLGD) pipe fitting in two ends has complex contour, the characteristics of forging molding difficulty.

Usually adopt conventional integrate forging process.Be about to pipe fitting and be forged into whole steel pipe, flange section on the pipe shaft adopts the machining mode to process, the forging surplus that this kind method is made is large, material cost is high, the following process surplus is large, process-cycle is long, and machining can cause pipe fitting cylindrical metallic fiber to be cut off, and overall construction intensity is reduced.

Also have a kind of free forging method, namely on the open die forging press with two end flanges forging moldings.But because the free forging method precision is low, stock utilization is extremely low, and the cylindrical of pipe fitting and the surplus of endoporus are large, and the following process surplus is large, and the process-cycle is long.

Summary of the invention

The objective of the invention is for above-mentioned present situation, aim to provide the Forging Technology that a kind of metal flow linearity is good, there is the pipe fitting of flange at two ends that the following process surplus is few, stock utilization is high, cost is low.

The implementation of the object of the invention is, there is the Forging Technology of the pipe fitting of flange at two ends, and concrete steps are:

1) tubulation base;

2) pipe uses plug and mould circle top to stretch forging at the horizontal water press, reserves one section pipe moulding one end flanges, just forges the pipe with an end flanges;

3) pipe bottom end and flange end rejected material are removed in the flame cutting;

4) at the other end of hydraulic press with local device local heat pipe;

5) at the other end flange of hydraulic press with flange upsetting apparatus pressurization jumping-up moulding pipe.

The pipe fitting profile following process surplus that adopts the present invention to make is few, has saved raw material, shortens the manufacturing cycle, has reduced manufacturing cost.The flange forging and molding mode that die forging of the present invention combines with loose tooling forging is guaranteed the whole continuity of pipe fitting metallic fiber to satisfy the bulk strength requirement of pipe fitting.

Description of drawings

Fig. 1 is the fitting structure schematic diagram that the present invention makes,

Fig. 2 is the fitting structure cutaway view that the present invention makes,

Fig. 3 is the pipe fitting one end flanges forging molding schematic diagram that the present invention makes,

Fig. 4 is the pipe fitting local heat schematic diagram that the present invention makes,

Fig. 5 is the pipe fitting other end flange forging molding schematic diagram that the present invention makes.

The specific embodiment

The pipe fitting of manufacturing of the present invention is that an end of pipe fitting body 1 has left flange 2, and the other end has the pipe fitting (referring to Fig. 1 and Fig. 2) of right flange 3, has complex contour, the characteristics of forging molding difficulty.

The specific embodiment of the present invention is:

1) tubulation base: steel ingot cutting remove feeders, adopt punching and top to stretch forging molding and go out pipe after the heating;

2) after pipe advances stove and is heated to forging temperature, use plug 4 and mould circle 5 tops to stretch forging at the horizontal water press, reserve one section pipe moulding left end flange, just forge the first moulding pipe (referring to Fig. 3) with left flange 2;

3) pipe bottom end and flange end rejected material are removed in cutting;

4) with the flange of the pipe of molded good left flange 2 down, pipe is vertically placed, with the right-hand member (referring to Fig. 4) of local heat stove 6 local heat pipes;

5) be heated to forging temperature after, local heat stove 6 is hung out, with the flange of the pipe of molded good left flange 2 down, pipe is vertically placed, and moves into hydraulic press, and flange upsetting apparatus 7 is depressed, the pressurization jumping-up, the right flange 3(of the right-hand member of moulding pipe is referring to Fig. 5).

6) behind the right-hand member flange forming, rise upsetting apparatus 7, forming pipe fitting as shown in Figure 1, the demoulding is shifted out hydraulic press with as shown in Figure 1 pipe fitting, and is hung out.

Vertical and horizontal water press of the present invention is common apparatus, need not describe in detail here.

Pipe area heating installation, flange upsetting apparatus in " there is heating, the upsetting apparatus of the pipe fitting of flange at two ends " that local heat stove, flange upsetting apparatus employing the applicant apply on the same day.The Adjustable supporter of pipe area heating installation is peripheral at the base positioning disk, is provided with adjusting screw(rod) on the Adjustable supporter, and movably the local heat stove is placed on the Adjustable supporter.The flange upsetting apparatus has the base location-plate, backstay of pair pipe location and to the jumping-up dish of pipe jumping-up, and backstay cooperates with hole on the jumping-up dish, and the employing interruption is weldingly connected; The base location-plate of backstay and area heating installation is arranged vertically up and down, the centres of the two.

Claims (1)

1. there is the Forging Technology of the pipe fitting of flange at two ends, it is characterized in that concrete steps are:

1) tubulation base;

2) pipe uses plug and mould circle top to stretch forging at the horizontal water press, reserves one section pipe moulding one end flanges, just forges the pipe with an end flanges;

3) pipe bottom end and flange end rejected material are removed in the flame cutting;

4) at the other end of hydraulic press with local device local heat pipe;

5) at the other end flange of hydraulic press with flange upsetting apparatus pressurization jumping-up moulding pipe.

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