CN103658476A - Integrated forming method for thick-wall hollow forge piece with boss on abnormal end face excircle - Google Patents

Integrated forming method for thick-wall hollow forge piece with boss on abnormal end face excircle Download PDF

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Publication number
CN103658476A
CN103658476A CN201310661361.6A CN201310661361A CN103658476A CN 103658476 A CN103658476 A CN 103658476A CN 201310661361 A CN201310661361 A CN 201310661361A CN 103658476 A CN103658476 A CN 103658476A
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forging
ring
die
stage
shaped
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CN103658476B (en
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扬晓禹
刘颖
刘凯泉
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Tianjin Heavy Equipment Engineering Research Co Ltd
China First Heavy Industries Co Ltd
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Tianjin Heavy Equipment Engineering Research Co Ltd
China First Heavy Industries Co Ltd
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Abstract

The invention discloses an integrated forming method for a thick-wall hollow forge piece with a boss on the abnormal end face excircle. The method comprises the following steps: (1) obtaining a forge piece part graph comprising the shape and the size, (2) adopting a simulation die forging process to optimize the shape of a forge blank according to the shape and the size of a forge piece, and adopting the size invariable principle to calculate the size value of the forge value, (3) designing a combined die according to the forge piece and the forge blank, (4) die forging. According to the method, the forge blank is prefabricated, and the combined die is manufacture so as to conduct one-time die forging, so that forming effect is good, forging permeability is good, and a forging piece streamline is complete.

Description

The thick-wall hollow forging integral forming method of the outer round belt boss of a kind of special-shaped end face
Technical field
The invention belongs to technical field of forging, is mainly about having the whole near-net forming forging method of the thick-wall hollow forging of boss at cylindrical with special-shaped end face, while.
Background technology
In production by two ends with space curved surface, and cylindrical is with the thick-wall hollow forging of boss, often by largest contours, at both ends of the surface and cylindrical, increases more than technique and after piece, it forged as thick-wall cylinder forging.Thick-wall cylinder forging general process route adopting in traditional flat-die forging is produced is: jumping-up, punching, core bar drawing (saddle forging).Because wall thickness and the length dimension of forging significantly increases, very large on the impact of forging operation and forging quality, especially the increase of wall thickness has the greatest impact for forging mechanical performance.Significantly increase due to wall thickness, the saturating property of forging of forging is poor, the raising of end tension in core bar drawing process simultaneously increases end face tearing tendency, this requires high III class pressure container forgeable piece for serviceability and safe class, to be difficult to meet UT flaw detection, T/4 sampling performance and impact property requirement, repair rate and scrappage all very high (first-time qualification rate is only 60% left and right) aborning.For this high flow rate of thorough change, the situation of low output, be badly in need of exploitation for having the whole near-net forming Forging Technology technology of the thick-wall hollow forging of boss at cylindrical with special-shaped end face, while.
Summary of the invention
For addressing the above problem, the invention provides the thick-wall hollow forging integral forming method of the outer round belt boss of a kind of special-shaped end face.Utilize hollow forging stock, in shaping dies, adopt progressively the process of die-forging forming gradually, with little plastic force die forging, go out profile full, the labyrinth thick-wall hollow forging that stress, strain regime distribute well, internal soundness is excellent.
For achieving the above object, the present invention takes following technical scheme: the thick-wall hollow forging integral forming method of the outer round belt boss of a kind of special-shaped end face, comprises the steps:
1) obtain forging part drawing, comprise shape and size;
2), according to forging shape and size, adopt simulation die forging process to optimize forging stock shape, and in conjunction with volume invariance principle, calculate the size value of forging stock;
3), according to forging and forging stock design team matched moulds, comprise upper ring body, finishing die, core, special-shaped end face ring body, lower ring body;
4) die forging.
Wherein, die forging specifically comprises the steps:
1. forging stock is heated in heating furnace, after the initial forging temperature, insulation certain hour of material, come out of the stove and hang in described combination die;
2. combination die is placed on press bench, combination die assembled relation is: special-shaped end face ring body is positioned at the end, and outer cover is established finishing die, and core wears core, position sandwiched forging stock between finishing die on abnormity end face ring body and core, is installed with upper ring body on forging stock;
3. with forcing press moved cross beam, upper ring body is exerted pressure, until the upper surface of upper ring body upper surface and finishing die and core stops depressing after concordant;
4. die assembly is lifted by crane together with forging, by lower ring body pad, below special-shaped end face ring body, moved cross beam is depressed again, observes lower ring body and is pressed into completely after finishing die, and die-forging forming finishes, and the demoulding obtains finished product forging.
Described forging can be divided into following part:
1) straight section stage portion, comprises characteristic size: inside diameter D 3, outer diameter D 2, straight section length of bench L 7;
2) the type conical bench portion of a side, after being next to straight section stage portion, comprises characteristic size: hold greatly outer rim D 1, small end outer rim D 2, taper subtended angle θ 2, type conical bench length L 8, taper small end is apart from straight section stage portion end face L 7;
3) with the middle straight section stage portion of type conical bench portion homonymy, after being next to type conical bench portion, comprise characteristic size: maximum outer rim D 1, length is: L 0-(L 1+ L 8+ L 7), L wherein 1for shape of a saddle endless belt axial length;
4) with the cylindrical boss portion of type conical bench portion and middle straight section stage portion opposite side, comprise characteristic size: the long L of boss 3, the wide L of boss 5, boss outer rim is apart from distance between center line L 6, boss near-end is L apart from straight section stage portion 11 outer faces 4.
5) shape of a saddle endless belt portion, after straight section stage portion, comprises characteristic size: endless belt outer rim D in the middle of being next to 0, endless belt outer end is to take radius as R 0the saddle-shaped surface that forms of circular arc, endless belt inner side is to take radius as R 1the saddle-shaped surface that forms of circular arc, the center of circle of two sections of circular arcs is all positioned on forging axis, endless belt axial length is L 1, endless belt inner side and middle straight section stage portion intersection rounding;
6) core, from straight section stage portion, one section isometrical section before this, length L 2, inside diameter D 3; Then be continuing property taper reducer, reducing subtended angle is θ 1; Taper reducing extends to and radius R 0saddle-shaped surface intersect till, its intersection position rounding.
Corresponding to described forging, the concrete grammar of forging stock design is:
First according to the part drawing of forging, record forging volume V after utilizing 3D sculpting software moulding 0, the volume V of forging stock is chosen for K V 0(K=1.05~1.1); Design forging stock is tubular construction simultaneously, and size is as follows:
D 4=D 1+△t
T 0=D 1-D 3+30mm
L 9 = 1.1 V 0.785 [ D 4 2 - ( D 4 - 2 T 0 ) 2 ]
D wherein 4for the external diameter of forging stock, T 0for the wall thickness of forging stock, L 9for forging stock length, △ t forges surplus, and value is 20~30mm, and being converted into one-sided wall thickness surplus is 10~15mm.
Corresponding to described forging and forging stock, mould each several part physical dimension is as follows:
For upper ring body, have:
Outer diameter D 5=D 1+ △ t-10
Inside diameter D 6=D 4+ 10mm=D 1+ △ t+10mm
Internal diameter subtended angle θ 32
Overall length L 10=L 7+ L 8+ 5 △ t
The high L of step 11=L 10-L 4-△ t
The wide L of step 12=L 5+ △ t
Step lateral surface is apart from distance between center line L 13=L 6+ △ t
For finishing die, have:
Interior path D 7=D 1+ △ t
Interior large footpath D 8=D 0+ △ t
Overall length L 14=L 0+ 10 △ t
Interior large path length L 15=R 0-R 1+ 5 △ t
The high L of stage portion 16=L 3+ L 4+ 6 △ t
The wide L of stage portion 17=L 12+ 10mm=L 5+ △ t+10mm
Stage portion outside is apart from distance between center line L 18=L 13+ 5mm=L 6+ △ t+5mm
Inner arc radius R 2=R 1-△ t
For core, have:
Small end outer diameter D 9=D 3-△ t
Large end outer diameter D 10=D 9+ 2(L 19-L 20-L 21) * cos(θ 4/ 2)
Overall length L 19=L 14=L 0+ 10 △ t
The long L of large end 20=L 14-L 0-5 △ t=5 △ t
Long-toe-short-heel L 21=L 2+ 5 △ t
Tapering transition subtended angle θ between large small end 41
For special-shaped end face ring body, have:
Inside diameter D 11=D 10+ 10mm=D 3-△ t+10mm
Outer diameter D 12=D 8-10mm=D 0+ △ t-10mm
High L 22=L 1+ 5 △ t
For lower ring body, have:
Inside diameter D 13=D 11+ 20mm=D 3-△ t+30mm
Outer diameter D 14=D 12-20mm=D 8-30mm
High L 23=5 △ t
The present invention is owing to taking above technical scheme to have the following advantages: 1. the present invention passes through prefabricated forging stock, and makes assembling die, carries out disposable die-forging forming, and operating process is simple and easy to do, and forming quality is stable; 2. forming effect is good, reduces machining amount, saves metal material; 3. forge saturating property good, forging streamline is complete, can improve the performance rate (machinery and physicochemical property) of forging; 4. the manufacturing cycle shortens, and once-forming, without multiple working procedure; 5. mould structure is simple, and product qualified rate is high, forging low cost of manufacture.
Accompanying drawing explanation
Fig. 1-1st, the main cutaway view of forging;
Fig. 1-2 is the axle center cutaway view of Fig. 1-1;
Fig. 1-3rd, in Fig. 1-1 along A to view;
Fig. 2 is forging stock figure;
Fig. 3 forges front mold and forging stock syntagmatic figure;
Fig. 4 forges rear mold and profiled member syntagmatic figure;
Fig. 5-1st, the main cutaway view of upper ring body in mould;
Fig. 5-2nd, the upward view of upper ring body in mould;
Fig. 5-3rd, the A in Fig. 5-1 is to view;
The main cutaway view of finishing die in the mould of Fig. 6-1;
Fig. 6-2nd, the top view of finishing die in mould;
Fig. 7 is the front view of mould core mould;
Fig. 8 is the main cutaway view of special-shaped end face ring body in mould.
The specific embodiment
The present invention is by the be shaped thick-wall hollow forging of the outer round belt boss of special-shaped end face of following processing step:
1) first by drawing, obtain the concrete structure size of forging, as shown in Fig. 1-1,1-2,1-3, forging can be divided into several parts by profile:
Straight section stage portion 11, comprises characteristic size: inside diameter D 3, outer diameter D 2, straight section length of bench L 7
The type conical bench portion 12 of one side, after being next to straight section stage portion 11, comprises characteristic size: hold greatly outer rim D 1, small end outer rim D 2, taper subtended angle θ 2, type conical bench length L 8, taper small end is apart from straight section stage portion end face L 7.
Middle straight section stage portion 13 with type conical bench portion 12 homonymies, after being next to type conical bench portion 12, comprises characteristic size: maximum outer rim D 1, length is: L 0-(L 1+ L 8+ L 7), L wherein 1for shape of a saddle endless belt axial length, see below about the introduction of shape of a saddle endless belt portion 15.
Cylindrical boss portion 14 with type conical bench portion 12 and middle straight section stage portion 13 opposite sides, comprises characteristic size: the long L of boss 3, the wide L of boss 5, boss outer rim is apart from distance between center line L 6, boss near-end is L apart from straight section stage portion 11 outer faces 4.
Shape of a saddle endless belt portion 15, after straight section stage portion 13, comprises characteristic size: endless belt outer rim D in the middle of being next to 0, endless belt outer end is to take radius as R 0the saddle-shaped surface that forms of circular arc, endless belt inner side is to take radius as R 1the saddle-shaped surface that forms of circular arc, endless belt axial length is L 1, endless belt inner side and middle straight section stage portion 13 intersection rounding R 4.
The core 16 of whole forging, from straight section stage portion 11, one section isometrical section before this, length L 2, inside diameter D 3; Then be continuing property taper reducer, reducing subtended angle is θ 1; Taper reducing extends to and R 0till the saddle-shaped surface that the circular arc of radius forms intersects, its intersection position rounding R 3.
2) according to the metal flow state in numerical simulation die forging process, optimize and select prefabricated forging stock shape, in conjunction with volume invariance principle, calculate the size value that obtains forging stock, concrete grammar is:
First according to the part drawing of forging, record forging volume for V after utilizing 3D sculpting software moulding 0, for guarantee forging part to fill type full, forging need to have the generation of flash, the volume V of prefabricated like this forging stock is chosen for K V 0(K=1.05~1.1); In conjunction with mould structure design and contour forging technique, designing prefabricated forging stock is tubular construction simultaneously, and as Fig. 2, appearance and size is as follows:
D 4=D 1+△t
T 0=D 1-D 3+30mm
L 9 = 1.1 V 0.785 [ D 4 2 - ( D 4 - 2 T 0 ) 2 ]
D wherein 4for the external diameter of forging stock, T 0for the wall thickness of forging stock, L 9for forging stock length, △ t forges surplus, and value is 20~30mm, and being converted into one-sided wall thickness surplus is 10~15mm.
3) according to above-mentioned forging and forging stock shape, size, design stamp forging mould, as shown in Figure 3,4, wherein Fig. 3 is beginning forging state to die assembly structure, Fig. 4 is finish-forging state.
Corresponding to several characteristics of forging, the present invention adopts the local mode of die forging gradually, and mould forms assembling die by upper ring body 1, finishing die 3, core 4, special-shaped end face ring body 5, lower ring body 6.Prefabricated forging stock 2 is placed in the assembling die that these parts form.
Each several part die structure size is as follows:
Upper ring body 1, is shown in Fig. 5-1,5-2,5-3, and straight section stage portion 11 and type conical bench portion 12 corresponding to forging, have:
D 5=D 1+△t-10
D 6=D 4+10mm=D 1+△t+10mm
L 10=L 7+L 8+5△t
L 11=L 10-L 4-△t
L 12=L 5+△t
L 13=L 6+△t
θ 32
For finishing die 3, see Fig. 6-1,6-2, the each several part profile corresponding to forging, has:
D 7=D 1+△t
D 8=D 0+△t
L 14=L 0+10△t
L 15=R 0-R 1+5△t
L 16=L 3+L 4+6△t
L 17=L 12+10mm=L 5+△t+10mm
L 18=L 13+5mm=L 6+△t+5mm
R 2=R 1-△t
For core 4, see Fig. 7, corresponding to forging core:
D 9=D 3-△t
D 10=D 9+2(L 19-L 20-L 21)*cos(θ 4/2)
L 19=L 14=L 0+10△t
L 20=L 14-L 0-5△t=5△t
L 21=L 2+5△t
θ 41
For special-shaped end face ring body 5, see Fig. 8, corresponding to shape of a saddle endless belt portion 15, have:
D 11=D 10+10mm=D 3-△t+10mm
D 12=D 8-10mm=D 0+△t-10mm
L 22=L 1+5△t
For lower ring body 6, see Fig. 4, be connected the bottommost in mould:
D 13=D 11+20mm=D 3-△t+30mm
D 14=D 12-20mm=D 8-30mm
L 23=5△t
4) by after being ready to by the forging stock of above-mentioned design and mould, carry out die forging, process is:
1. forging stock 2 is heated in heating furnace, after the initial forging temperature, insulation certain hour of material, come out of the stove and hang in combination die as shown in Figure 3.
2. by forging stock and mould by being assembled on press bench shown in Fig. 3, assembled relation is: special-shaped end face ring body 5 overcoats are established finishing die 3,5 li of abnormity end face ring bodies wear core 4, and sandwiched forging stock 2 between the finishing die 3 on special-shaped end face ring body 5 and core 4, is installed with upper ring body 1 on forging stock 2.
3. with forcing press moved cross beam, upper ring body 1 is exerted pressure, until the upper surface of upper ring body 1 upper surface and finishing die 3 and core 4 stops depressing after concordant.
4. die assembly is lifted by crane together with forging, by lower ring body 6 pads, below special-shaped end face ring body 5, moved cross beam is depressed again, observes lower ring body 6 and is pressed into completely after finishing die 3, and die-forging forming finishes, and the demoulding obtains finished product forging.

Claims (5)

1. a thick-wall hollow forging integral forming method for the outer round belt boss of special-shaped end face, comprises the steps:
1) obtain forging part drawing, comprise shape and size;
2), according to forging shape and size, adopt simulation die forging process to optimize forging stock shape, and in conjunction with volume invariance principle, calculate the size value of forging stock;
3), according to forging and forging stock design team matched moulds, comprise upper ring body, finishing die, core, special-shaped end face ring body, lower ring body;
4) die forging.
2. the thick-wall hollow forging integral forming method of the outer round belt boss of special-shaped end face according to claim 1, is characterized in that, die forging comprises the steps:
1. forging stock is heated in heating furnace, after the initial forging temperature, insulation certain hour of material, come out of the stove and hang in described combination die;
2. combination die is placed on press bench, combination die assembled relation is: special-shaped end face ring body is positioned at the end, and outer cover is established finishing die, and core wears core, position sandwiched forging stock between finishing die on abnormity end face ring body and core, is installed with upper ring body on forging stock;
3. with forcing press moved cross beam, upper ring body is exerted pressure, until the upper surface of upper ring body upper surface and finishing die and core stops depressing after concordant;
4. die assembly is lifted by crane together with forging, by lower ring body pad, below special-shaped end face ring body, moved cross beam is depressed again, observes lower ring body and is pressed into completely after finishing die, and die-forging forming finishes, and the demoulding obtains finished product forging.
3. the thick-wall hollow forging integral forming method of the outer round belt boss of special-shaped end face according to claim 1 and 2, is characterized in that, described forging comprises:
1) straight section stage portion, comprises characteristic size: inside diameter D 3, outer diameter D 2, straight section length of bench L 7;
2) the type conical bench portion of a side, after being next to straight section stage portion, comprises characteristic size: hold greatly outer rim D 1, small end outer rim D 2, taper subtended angle θ 2, type conical bench length L 8, taper small end is apart from straight section stage portion end face L 7;
3) with the middle straight section stage portion of type conical bench portion homonymy, after being next to type conical bench portion, comprise characteristic size: maximum outer rim D 1, length is: L 0-(L 1+ L 8+ L 7), L wherein 1for shape of a saddle endless belt axial length;
4) with the cylindrical boss portion of type conical bench portion and middle straight section stage portion opposite side, comprise characteristic size: the long L of boss 3, the wide L of boss 5, boss outer rim is apart from distance between center line L 6, boss near-end is L apart from straight section stage portion 11 outer faces 4.
5) shape of a saddle endless belt portion, after straight section stage portion, comprises characteristic size: endless belt outer rim D in the middle of being next to 0, endless belt outer end is to take radius as R 0the saddle-shaped surface that forms of circular arc, endless belt inner side is to take radius as R 1the saddle-shaped surface that forms of circular arc, the center of circle of two sections of circular arcs is all positioned on forging axis, endless belt axial length is L 1, endless belt inner side and middle straight section stage portion intersection rounding;
6) core, from straight section stage portion, one section isometrical section before this, length L 2, inside diameter D 3; Then be continuing property taper reducer, reducing subtended angle is θ 1; Taper reducing extends to and radius R 0saddle-shaped surface intersect till, its intersection position rounding.
4. the thick-wall hollow forging integral forming method of the outer round belt boss of special-shaped end face according to claim 3, is characterized in that, corresponding to described forging, the concrete grammar of described forging stock design is:
First according to the part drawing of forging, record forging volume V after utilizing 3D sculpting software moulding 0, the volume V of forging stock is chosen for K V 0(K=1.05~1.1); Design forging stock is tubular construction simultaneously, and size is as follows:
D 4=D 1+△t
T 0=D 1-D 3+30mm
D wherein 4for the external diameter of forging stock, T 0for the wall thickness of forging stock, L 9for forging stock length, △ t forges surplus, and value is 20~30mm, and being converted into one-sided wall thickness surplus is 10~15mm.
5. according to the thick-wall hollow forging integral forming method of the outer round belt boss of the special-shaped end face described in claim 3 or 4, it is characterized in that, corresponding to described forging and forging stock, mould each several part physical dimension is as follows:
For upper ring body, have:
Outer diameter D 5=D 1+ △ t-10
Inside diameter D 6=D 4+ 10mm=D 1+ △ t+10mm
Internal diameter subtended angle θ 32
Overall length L 10=L 7+ L 8+ 5 △ t
The high L of step 11=L 10-L 4-△ t
The wide L of step 12=L 5+ △ t
Step lateral surface is apart from distance between center line L 13=L 6+ △ t
For finishing die, have:
Interior path D 7=D 1+ △ t
Interior large footpath D 8=D 0+ △ t
Overall length L 14=L 0+ 10 △ t
Interior large path length L 15=R 0-R 1+ 5 △ t
The high L of stage portion 16=L 3+ L 4+ 6 △ t
The wide L of stage portion 17=L 12+ 10mm=L 5+ △ t+10mm
Stage portion outside is apart from distance between center line L 18=L 13+ 5mm=L 6+ △ t+5mm
Inner arc radius R 2=R 1-△ t
For core, have:
Small end outer diameter D 9=D 3-△ t
Large end outer diameter D 10=D 9+ 2(L 19-L 20-L 21) * cos(θ 4/ 2)
Overall length L 19=L 14=L 0+ 10 △ t
The long L of large end 20=L 14-L 0-5 △ t=5 △ t
Long-toe-short-heel L 21=L 2+ 5 △ t
Tapering transition subtended angle θ between large small end 41
For special-shaped end face ring body, have:
Inside diameter D 11=D 10+ 10mm=D 3-△ t+10mm
Outer diameter D 12=D 8-10mm=D 0+ △ t-10mm
High L 22=L 1+ 5 △ t
For lower ring body, have:
Inside diameter D 13=D 11+ 20mm=D 3-△ t+30mm
Outer diameter D 14=D 12-20mm=D 8-30mm
High L 23=5 △ t.
CN201310661361.6A 2013-12-06 2013-12-06 A kind of thick-wall hollow forging integral forming method of special-shaped angle head cylindrical band boss Active CN103658476B (en)

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CN104368724A (en) * 2014-11-24 2015-02-25 二重集团(德阳)重型装备股份有限公司 Forging forming process for large thick-wall end socket with bearing and nozzle
CN104384428A (en) * 2014-12-01 2015-03-04 重庆理工大学 Warm precise forging forming method for hollow gear shaft blank

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JP2001047173A (en) * 1999-06-04 2001-02-20 Toto Ltd Die forging method
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Publication number Priority date Publication date Assignee Title
CN104368724A (en) * 2014-11-24 2015-02-25 二重集团(德阳)重型装备股份有限公司 Forging forming process for large thick-wall end socket with bearing and nozzle
CN104368724B (en) * 2014-11-24 2016-05-25 二重集团(德阳)重型装备股份有限公司 The large thick-wall end socket forging and forming technology of band supporting and ozzle
CN104384428A (en) * 2014-12-01 2015-03-04 重庆理工大学 Warm precise forging forming method for hollow gear shaft blank

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