CN102366883A

CN102366883A - Die forging technology of shell of titanium alloy (TC4) nozzle base

Info

Publication number: CN102366883A
Application number: CN201110395334XA
Authority: CN
Inventors: 陈瑞钢; 崔慧然; 姚恒烨; 李湘军; 杨海东; 赵顺峰; 周俊; 徐大懋
Original assignee: Wuxi Turbine Blade Co Ltd
Current assignee: Wuxi Turbine Blade Co Ltd
Priority date: 2011-12-02
Filing date: 2011-12-02
Publication date: 2012-03-07

Abstract

The invention provides a die forging technology of a shell of a titanium alloy (TC4) nozzle base, which can solve the problems of high labor strength of workers, complex process technology, low process efficiency and bad process precision which are caused by making a blank through open-die forging in the prior art. The die forging technology is characterized by being applicable to a shell piece with a head diameter ratio less than 3.5. The die forging technology comprises the following steps of: at first, discharging bars; then turning one of the end faces of the blank and chamfering, and turning a matching die cone surface at the other end of the blank; heating the blank; and finally, directly carrying out die forging on the blank in a forging die by a hydraulic screw pressure machine.

Description

The contour forging technique of a kind of titanium alloy (TC4) nozzle block housing

Technical field

The present invention relates to the contour forging technique technical field, be specially the contour forging technique of a kind of titanium alloy (TC4) nozzle block housing.

Background technology

Nozzle block is one of assembling parts in the solid propellant rocket; Wherein nozzle block housing forging structure is seen accompanying drawing 1; It comprises forging U-shaped head 10 and small end bar portion 11, and existing titanium alloy (TC4) nozzle block housing forging contour forging technique is: (1), bar blanking; (2), planar end surface chamfering; (3), bar heating; (4), electric liquid hammer carries out the open die forging base to blank, the small end conical surface of first shaping blank; (5), the small end conical surface of further Vehicle Processing blank; (6), blank carries out the heating second time; (7) blank is put into 40000kN flypress die-forging forming forging head.Its technology shortcoming is: its blank-making technology adopts electric liquid hammer open die forging base, because billet weight is big, reaches 23.48Kg, and labor strength is big; When the open die forging base shaping small end conical surface; At first be to adopt the wedge circumferencial direction to forge the inclined-plane; And then round as a ball with the Hough mould the inclined-plane, not only processing technology is complicated, stock utilization is low, working (machining) efficiency is low for it, and because the open die forging forming accuracy is low; Forging conical surface tapering, conical surface length and end face diameter are difficult to guarantee in its open die forging process; As being prone on the conical surface, leave the pit that is difficult to avoid in the round as a ball operation of Hough mould, and the open die forging hitting power is difficult to control and is prone to cause that conical surface length is overproof, the small end diameter is less than normal or bigger than normal, if when adopting wedge volume under pressure is big in blank cylindrical shaping inclined-plane process; Surface metal flows greater than heart portion, is prone to cause the interior concave defect of small end face; Because each hitting power difference causes metal flow inconsistent, be prone to cause blank crooked in this round as a ball process in external inclined-plane; Conical surface center needs follow-up machined to guarantee to overlap with bar portion center; In addition; When the further Vehicle Processing blank small end conical surface; Because forging does not allow end face to have centre hole to exist, and therefore when the clamping blank is brought in the Vehicle Processing small end conical surface greatly, can on small end face, leave the technology step of a φ 20mm～φ 25mm; Need to remove through follow-up polishing, working (machining) efficiency is low.Fig. 2 is the preceding ejection process route view of die forging in the existing technology, and among Fig. 2,1 is the blank small end conical surface, and 2 is blank small end face technology step; Fig. 3 is existing contour forging technique sketch map, and among Fig. 3,3 is patrix, and 4 is counterdie, and 5 are the die forging blank.

Summary of the invention

To the problems referred to above; The invention provides the contour forging technique of a kind of titanium alloy (TC4) nozzle block housing, it can solve, and the labor strength that causes owing to employing open die forging base in the existing technology is big, processing technology is complicated, working (machining) efficiency is low and the problem of machining accuracy difference.

Its technical scheme is such; It is characterized in that: it is applicable to that head footpath is than less than 3.5 housing component; It comprises following procedure of processing: at first bar blanking, and one of them end face and the chamfering of Vehicle Processing blank then, then the Vehicle Processing blank other end joins the mould conical surface; Carry out the heating of blank again, last blank is in forging die, through the direct die-forging forming of hydraulic pressure flypress.

It is further characterized in that: said Vehicle Processing blank one end join the mould conical surface time, said tapering of joining the mould conical surface is that 1 °～3 °, said conical surface width are not less than 1/3 of said blank diameter; Said blank is in the direct die-forging forming process of hydraulic pressure flypress, and said workpiece bar portion drafting angle is that 1 °～3 °, head draft are 7 °.

Compare with existing titanium alloy (TC4) nozzle block housing swaging processing method; Beneficial effect of the present invention is: it is machining the joining behind the mould conical surface directly by hydraulic pressure flypress die-forging forming an of end face and an end to blank; Saved the process of the open die forging base in the technology in the past; Thereby reduced working strength of workers greatly, simplified processing technology, improve working (machining) efficiency and stock utilization simultaneously, and guaranteed machining accuracy.

Description of drawings

Fig. 1 is titanium alloy of the present invention (TC4) nozzle block housing forging structural representation;

Fig. 2 is the preceding ejection process route view of die forging in existing titanium alloy (TC4) the nozzle block housing forging contour forging technique;

Fig. 3 is existing titanium alloy (TC4) nozzle block housing forging contour forging technique sketch map;

Fig. 4 is the preceding ejection process route view of die forging in titanium alloy of the present invention (TC4) the nozzle block housing contour forging technique;

Fig. 5 is titanium alloy of the present invention (TC4) nozzle block housing contour forging technique sketch map.

The specific embodiment

See Fig. 4 and Fig. 5; Technology of the present invention comprises following processing step: at first bar blanking; One of them end face and the chamfering of Vehicle Processing blank then; Then the Vehicle Processing blank other end join the mould conical surface 10, heat blank again, at last blank 7 is put in counterdie 8 chambeies of forging die, drives patrix 6 descending, direct die-forging formings through the hydraulic pressure flypress; In the die-forging forming process; Blank 7 is placed in the lower mode cavity; The mould conical surface of joining of blank one end contacts with the applying of the mould conical surface and with the lower mode cavity bottom surface is unsettled; Patrix 6 is extruded into the U-shaped head 10 of die forging spare descending under the drive of hydraulic pressure flypress and in descending process, push the small end bar portion 11 of blank 7 at lower mode cavity internal shaping housing forging along with the descending pier of the continuation of patrix 6.The mould conical surface of joining of blank lower end plays effective guide effect in die forging process; The tapering of joining the mould conical surface is that 1 °～3 °, width (W) are not less than 1/3 of blank diameter (φ d); Thereby guarantee die forging process blank center and mould centre of percussion centering, otherwise can cause the head material to influence forging quality partially, when cooperation conical surface width less than diameter 1/3 the time center can not guarantee; Cause head material inclined to one side, the product head has the angle of seriously collapsing.Blank is in the direct die-forging forming process of hydraulic pressure flypress, and the said workpiece bar drafting angle α of portion is that 1 °～3 °, head draft β are 7 °.In order to subtract blank die-forging forming resistance, the lower mode cavity bottom of forging die should have passage 9.Process application of the present invention diameter reducing process principle in the plastic deformation cold forming process; Through blank being loaded axial compressive force, making that blank cross section in forging die cavity reduces, length prolongs; Thereby can one time die-forging forming, the technological process of having saved open die forging base in the existing technology; Simplify processing technology greatly, improved production efficiency and stock utilization; Technology of the present invention is only applicable to head footpath than less than 3.5 housing component forging, and the footpath pushes than surpassing 3.5 o'clock patrixes that obvious bending can take place head material in the process right overhead, cause expect inclined to one side.

Claims

1. the contour forging technique of a titanium alloy (TC4) nozzle block housing; It is characterized in that: it is applicable to that head footpath is than less than 3.5 housing component; It comprises following procedure of processing: at first bar blanking, and one of them end face and the chamfering of Vehicle Processing blank then, then the Vehicle Processing blank other end joins the mould conical surface; Carry out the heating of blank again, last blank is in forging die, through the direct die-forging forming of hydraulic pressure flypress.

2. the contour forging technique of a kind of titanium alloy according to claim 1 (TC4) nozzle block housing; It is characterized in that: said Vehicle Processing blank one end join the mould conical surface time, said tapering of joining the mould conical surface is that 1 °～3 °, said conical surface width are not less than 1/3 of said blank diameter.

3. the contour forging technique of a kind of titanium alloy according to claim 2 (TC4) nozzle block housing; It is characterized in that: said blank is in the direct die-forging forming process of hydraulic pressure flypress, and said workpiece bar portion drafting angle is that 1 °～3 °, head draft are 7 °.