CN102319783A - Heat-push bending method for producing pipe fittings with equal diameters and equal wall thicknesses - Google Patents

Abstract

The invention relates to a heat-push bending method for producing pipe fittings with equal diameters and equal wall thicknesses, which comprises the following steps of: (1) cutting an elbow pipe fitting billet so as to enable two ends of the elbow pipe fitting billet to be of an inclined opening shape respectively, the length of a long segment of the elbow pipe fitting billet to be the length of an outer arc of an elbow pipe fitting product needed to be produced, and the length of a short segment of the elbow pipe fitting billet to be the length of an inner arc of an elbow pipe fitting product needed to be produced; (2) putting the cut elbow pipe fitting billet into a heating furnace, and heating the elbow pipe fitting billet to be 900-1000 DEG C; and (3) putting the heated elbow pipe fitting billet into a heat-push bending device for the pipe fittings with the equal diameters and the equal wall thicknesses, and carrying out pipe fitting pushing to obtain the finished pipe fittings with the equal diameters and the equal wall thicknesses. The invention has the advantages that: according to the method, the produced pipe fittings have equal wall thicknesses without being thinned, small dimensional deviation and attractive appearances.

Description

The isometrical curved production method that picks that waits the wall thickness pipe fitting

Technical field

The present invention relates to a kind of isometrical production method that waits the wall thickness pipe fitting, relate in particular to a kind of isometrical curved production method that picks that waits the wall thickness pipe fitting.

Background technology

At present, the forming method of elbow mainly contains two kinds of pushing and punching presses, and pushing divides cold extrusion, picks system.

1, the forming process of cold extrusion elbow is to use special-purpose elbow hydro-forming machine; Pipe is put into assembling die; Under the promotion of push rod, the intermittent motion that pipe is reserved along internal mold and external mold and accomplish forming process is taken out the pipe fitting that is shaped by stripper apparatus at last.

Because each executing agency of elbow hydro-forming machine is all in same framework; Mechanism size is less, and thrust is also less, so the latus rectum of the elbow of its production is all smaller; Wall thickness is also thinner, is shaped to adopt these technology manufacturings so generally be no more than the stainless steel bend of the thin-walled of DN400 latus rectum more.

2, picking system elbow forming technology is to adopt special-purpose elbow push machine, core and intermediate frequency induction heating device, and the blank that is enclosed within on the mould is travelled forward under the promotion of push machine, is heated at the volley, the process of hole enlargement and bending forming.The deformation characteristics that picks elbow is to confirm the pipe diameter according to the rule of constancy of volume before and after the metal material plastic deformation, and the pipe diameter that is adopted is less than elbow diameter.

Pick and make the main manufacturing process that the elbow forming technology becomes carbon steel, steel alloy elbow.The mode of heating of forming process has intermediate frequency or high-frequency induction heating (heating collar can be many circles or single).

Owing to pick the process that there is hole enlargement in the system elbow; There is certain destruction in stress state to pipe; Particularly high-temperature and pressure pipelines such as ultra supercritical unit, hydrogenation plant are used the high alloy elbow; Reset condition in the time of can't being returned to pipe through heat-treating methods after the moulding exists bigger stress to concentrate, and has influenced use.

3, the drawing elbow is the forming technology that is applied to produce in batches seamless elbow the earliest; At present; In the elbow production of regular size, substituted by the method for picking or other forming technology; The pipe that the drawing employing of elbow equates with the elbow external diameter, working pressure machine be direct press forming in mould.Before punching press, pipe is placed on the counterdie, and with inner core and the end mould pipe of packing into, patrix moves downward and begins compacting, makes the elbow shaping through the constraint of external mold and the supporting role of internal mold.

Compare with picking technology, the presentation quality of drawing is not as the former, the as easy as rolling off a log generation depressed deformation of elbow two-port particularly, and inner core also can't take out; Punched bend outer arc when being shaped is in extended state, does not have the unnecessary metal in other position to compensate, so the wall thickness reduction at outer arc place is also big than the former.

Summary of the invention

To above-mentioned shortcoming, the wall thickness that the object of the present invention is to provide a kind of pipe fitting that can make production evenly, wall thickness basically not attenuate, dimensional discrepancy is little and the wall thickness pipe fitting such as isometrical of good looking appearance pick curved production method.

Technology contents of the present invention does, a kind of isometrical curved production method that picks that waits the wall thickness pipe fitting, and its step is following:

(1), cutting bend pipe tools blank; Make the two ends of bend pipe tools blank become tilted mouth shape, and to make the long segment length of bend pipe tools blank be that the outer arc length of required production bend pipe tools finished product, the short segment length of bend pipe tools blank are the inner arc length of required production bend pipe tools finished product;

(2), the bend pipe tools blank of well cutting is put into heating furnace, with bend pipe tools blank heating to 900～1000 ℃;

(3), the bending apparatus that picks of putting into wall thickness pipe fitting such as isometrical of the bend pipe tools blank after will heating carries out the pipe fitting pushing, promptly gets the isometrical wall thickness pipe fitting finished product that waits.

Above-mentioned isometrical the grade in the curved production method of picking of wall thickness pipe fitting, the isometrical bending apparatus that picks of wall thickness pipe fitting that waits comprises and promotes mainly oil cylinder, framework, push rod, assembling die, mould jacking block, mold position oil cylinder, interior plug, location and stripper apparatus; Promote mainly oil cylinder and be installed in framework one end and being connected with push rod one end; The mold position oil cylinder is arranged on the framework other end and is connected with the mould jacking block; Assembling die is horizontally set between push rod and the mould jacking block; Push rod is aimed at the inner chamber inlet of assembling die, and location and stripper apparatus are arranged on the exit of the inner chamber of assembling die, and interior plug is clamped and is positioned in the inner chamber of assembling die by location and stripper apparatus.

The advantage that the present invention had is:

1, removes the local intermediate frequency induction heating device that picks system elbow push machine, adopted heating furnace that the pipe fitting blank is carried out the integral body heating, improved the pipe elbow integrated stress situation and the product quality of producing.

2, internal mold adopt whole in mandrel structure, and be furnished with stripper apparatus, make after the moulding the product wall thickness evenly, wall thickness not attenuate, little, the good looking appearance of dimensional discrepancy basically.

Description of drawings

Fig. 1 is the isometrical structural representation that picks bending apparatus that waits the wall thickness pipe fitting among the present invention.

Fig. 2 be among Fig. 1 A-A to sketch map.

Fig. 3 is the structural representation of bend pipe tools blank among the present invention.

The specific embodiment

As shown in Figure 1 and shown in Figure 2, a kind of isometrical bending apparatus that picks that waits the wall thickness pipe fitting is characterized in that it comprises to promote mainly oil cylinder 1, framework 2, push rod 3, assembling die 4, mould jacking block 5, mold position oil cylinder 6, interior plug 7, location and stripper apparatus 8; Promote mainly oil cylinder 1 and be installed in framework 2 one ends and being connected with push rod 3 one ends; Mold position oil cylinder 6 is arranged on framework 2 other ends and is connected with mould jacking block 5; Assembling die 4 is horizontally set between push rod 3 and the mould jacking block 5; Push rod 3 is aimed at the inner chamber inlet of assembling die, and location and stripper apparatus 8 are arranged on the exit of the inner chamber of assembling die 4, and interior plug 7 is clamped and is positioned in the inner chamber of assembling die 4 by location and stripper apparatus 8.

As shown in Figure 3; The 9.1 one-tenth tilted mouth shapes in the two ends of bend pipe tools blank 9, and the outer arc length that is required production bend pipe tools finished product that makes long section 9.2 length of bend pipe tools blank, short section 9.3 length of bend pipe tools blank are the inner arc length of required production bend pipe tools finished product.

Example 1, production pipe fitting specification are φ 508*50, the elbow of 1.5D

1, uses the steel pipe cutting bend pipe tools blank of specification as φ 508*50; Make the two ends of bend pipe tools blank become tilted mouth shape, and to make the long segment length of bend pipe tools blank be that the outer arc length of required production bend pipe tools finished product, the short segment length of bend pipe tools blank are the inner arc length of required production bend pipe tools finished product; Long segment length 1600mm, short segment length 900mm;

(2), the bend pipe tools blank of well cutting is put into heating furnace, with bend pipe tools blank heating to 950 ℃;

(3), the bending apparatus that picks of putting into wall thickness pipe fitting such as isometrical of the bend pipe tools blank after will heating carries out the pipe fitting pushing; The bend pipe tools blank that will be specially after will heating is earlier put into assembling die 4; Long section is positioned over the outer arc place of assembling die, and short section is aimed at the inner arc place of assembling die, starts and promotes mainly oil cylinder 1; Make push rod 3 push the inner chamber of assembling die 4; Promotion bend pipe tools blank gets into the bending section of assembling die 4, and in the space of plug 7 and assembling die 4, the bend pipe tools blank just formed required elbow shape and size through this gap in the bend pipe tools blank got into simultaneously; Start and promote mainly oil cylinder 1, make push rod 3 withdraw from the inner chamber of assembling die 4; The discrete group mould 4 then, start location and stripper apparatus 8, produce assembling die 4 with pushing away curved good bend pipe tools with interior plug, will push away curved elbow again and break away from from interior plug 7, and promptly making specification is φ 508*50,1.5D bend pipe tools.

Claims (1)

1. isometrical curved production method that picks that waits the wall thickness pipe fitting, its step is following:

(1), cutting bend pipe tools blank; Make the two ends of bend pipe tools blank become tilted mouth shape, and to make the long segment length of bend pipe tools blank be that the outer arc length of required production bend pipe tools finished product, the short segment length of bend pipe tools blank are the inner arc length of required production bend pipe tools finished product;

(2), the bend pipe tools blank of well cutting is put into heating furnace, with bend pipe tools blank heating to 900～1000 ℃;

(3), the bending apparatus that picks of putting into wall thickness pipe fitting such as isometrical of the bend pipe tools blank after will heating carries out the pipe fitting pushing, promptly gets the isometrical wall thickness pipe fitting finished product that waits.

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