CN115430801A

CN115430801A - Integral forming method for axial special-shaped ring forging

Info

Publication number: CN115430801A
Application number: CN202211398745.9A
Authority: CN
Inventors: 刘其源; 何方有; 许志成; 刘峰; 孙传华; 王骏; 蒋小飞; 杨雄
Original assignee: Wuxi Paike New Material Technology Co ltd
Current assignee: Wuxi Paike New Material Technology Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2022-12-06
Anticipated expiration: 2042-11-09
Also published as: CN115430801B

Abstract

The invention discloses an integral forming method of an axial special-shaped ring forging, belonging to the technical field of rolling process and comprising the following specific steps: s1, forging and heating; s2, multi-directional forging; s3, punching the upset cake; s4, pre-rolling and heating; s5, pre-rolling; s6, rolling the ring in an axial special shape, and placing the heated annular blank in a middle rigid mold, wherein the middle rigid mold is a special-shaped mold with an axial groove, and the middle rigid mold is matched with a core roller and a straight-wall main roller for use, and finally rolling is carried out to obtain the axial special-shaped ring forging. By introducing the intermediate rigid die, the near-net-shape forming production and manufacturing of the axial special-shaped ring forging are realized, the machining allowance is reduced, and the allowance of the product is optimized, so that the utilization rate of raw materials is improved, and the cost of the raw materials and the machining cost are reduced.

Description

Integral forming method for axial special-shaped ring forging

Technical Field

The invention belongs to the technical field of rolling processes, and particularly relates to an integral forming method of an axial special-shaped ring forging.

Background

With the rapid development of aerospace industry, modern national defense industry and transportation industry at home and abroad, the ring forgings for aerospace vehicles and aeroengines are more and more in vigorous demand. And as the ring rolling technology is more mature, the design of the ring piece is more refined, and the near net shape forming design and the manufacturing application of the special-shaped ring forging piece are more and more extensive. The cross section of the special-shaped ring forging is closer to the shape contour of a part, and the machining allowance can be reduced to a large extent, so that the damage of machining to the forging flow line of the ring piece is reduced, a large amount of precious metal materials are saved, and the material utilization rate is improved.

However, at present, no manufacturers at home and abroad can realize the integral forming of the special-shaped ring forging with the axial stringers on the outer diameter. The existing main production process of the product comprises the following steps: firstly, a straight wall is used for rolling a ring, then an inner hole flange with an end frame is lathed, and then the outer diameter is machined in a milling mode, so that the axial special shape of the outer diameter is realized. However, the production process has the advantages of extremely low material utilization rate, damaged forging streamline, complex process and high comprehensive cost.

Further, the related art patent CN102085549B discloses a forming method for processing the outer peripheral surface of a high-cylinder forged piece by using a follower die. However, in this patent, the circumferential groove of the inner ring surface of the follower die is formed in the circumferential direction, and therefore, only the irregular rolling in the circumferential direction can be performed. Because the characteristics of ring rolling forming are continuous deformation of metal along the circumferential direction, the existing special-shaped ring forging realizes annular special shape, and the special shape is uniformly distributed along the circumference, namely the shapes of all axial section positions are necessarily consistent. With the development of ring rolling equipment, the production of the annular special-shaped ring forging piece can be realized even if the method is not adopted. However, at home and abroad, no report on the integral forming of the axial special-shaped ring forging is provided so far.

Disclosure of Invention

Aiming at the problems in the prior art, the invention discloses an integral forming method of an axial special-shaped ring forging, which realizes the near-net forming production and manufacturing of the axial special-shaped ring forging by introducing a middle rigid die with an axial groove.

The technical purpose of the invention is realized by the following technical scheme:

an integral forming method of an axial special-shaped ring forging comprises the following specific steps:

s1, forging and heating, heating the blank to 440-480 ℃, keeping the temperature for 18-20 h, and discharging;

s2, multi-directional forging, namely performing multi-directional forging on the blank by adopting a press machine to improve the structure performance of the blank to obtain a cylindrical blank;

s3, punching the upset cake, namely, upsetting and deforming the cylindrical blank along the axial direction, and after the cylindrical blank reaches a preset height, punching the cylindrical blank by using a cylindrical punch to obtain an annular blank with holes;

s4, pre-rolling and heating, namely heating the annular blank with the holes obtained in the step S3 to 440-480 ℃, preserving heat for 9-12 hours, and discharging;

s5, pre-rolling, namely pre-rolling the annular blank with the hole to an annular blank with a rectangular axial section;

s6, heating the annular blank to 440-480 ℃, keeping the temperature for 9-12 h, discharging, and then placing the heated annular blank in an intermediate rigid mold, wherein the intermediate rigid mold is a special-shaped mold with an axial groove, the intermediate rigid mold is matched with a core roll and a straight wall main roll for use, and finally rolling to obtain an axial special-shaped ring forging, and the specific matching rolling method of the intermediate rigid mold, the core roll and the straight wall main roll is as follows:

controlling the straight wall main roller to rotate in the forward direction, driving the middle rigid mold to rotate in the reverse direction by the straight wall main roller, driving the annular blank to rotate in the reverse direction by the middle rigid mold, controlling the core roller to perform feeding motion along the radial direction towards the straight wall main roller, and controlling the outer diameter of the holding roller to be in contact with the outer diameter of the middle rigid mold; when the outer diameter of the annular blank is completely attached to the inner diameter of the middle rigid mold, the annular blank and the middle rigid mold move synchronously, the angular speed and the linear speed of the annular blank and the middle rigid mold are consistent, the straight-wall main roller is continuously controlled to rotate in the positive direction, and the core roller performs feeding motion along the radial direction towards the direction of the straight-wall main roller.

Preferably, the core roll is a straight-walled core roll or a profiled core roll.

Preferably, one end or two ends of the special-shaped core roller are provided with flange steps for carrying out inner hole special-shaped ring rolling on the annular blank, and an inner end frame flange is formed on the inner wall surface of the annular blank.

Preferably, the step of performing inner hole special-shaped ring rolling by adopting the special-shaped core roller is positioned between the step S5 of pre-rolling and the step S6 of heating the axial special-shaped ring rolling, and the specific steps are as follows:

heating the ring-shaped blank obtained by the pre-rolling in the step S5 to 440-480 ℃, preserving heat for 9-12 h, discharging, and then carrying out inner hole special-shaped ring rolling on the heated ring-shaped blank by using a special-shaped core roller and a straight wall main roller to obtain the ring-shaped blank with the special-shaped inner hole.

Preferably, the specific steps of S2 are as follows: upsetting and re-upsetting in the Z-axis direction, upsetting and elongating in the Y-axis direction and upsetting and elongating in the X-axis direction are sequentially carried out on the blank by adopting a press, finally, elongating is carried out in the Z-axis direction, the deformation amount of each pass is controlled to be 45-55%, and the forging pressing speed of the press is controlled to be 10-50 mm/s.

Preferably, the specific steps of S3 are as follows:

s3-1, upsetting and rounding the cylindrical blank along the Z-axis direction, wherein the deformation is controlled to be 45-55%;

and S3-2, punching the upset blank to form an annular blank with a preset size.

Preferably, in S5, the pre-rolling deformation is controlled to be 45% -60%, the rotating speed of the straight wall main roller is 1.5-1.7rad/S, the rolling ring speed increasing is controlled to be 8-12 mm/S, and the blank is pre-rolled to an annular blank with a rectangular cross section.

Preferably, in the step b, the deformation of the inner hole special-shaped rolling ring is controlled to be 25-40%, the rotating speed of the straight wall main roller is 1.2-1.5rad/s, and the speed increasing of the rolling ring is controlled to be 5-8 mm/s.

Preferably, in S6, the intermediate rigid mold is an annular mold, and at least one axial groove is distributed on the inner wall surface of the annular mold along the circumferential direction, and the axial groove is matched with the axial stringer of the target ring forging.

Preferably, in S6, the ring rolling step includes:

s6-1: preheating the intermediate rigid mold to 350-400 ℃, and then placing the intermediate rigid mold on a working plane of a ring machine;

s6-2: placing the heated annular blank in a middle rigid mold, wherein the outer diameter of the annular blank is smaller than the inner diameter of the middle rigid mold;

s6-3: the core roller passes through the inner hole of the annular blank, and the intermediate rigid die and the annular blank are taken as a whole to be rolled by a ring rolling machine;

s6-4: controlling the straight wall main roller to rotate forward, driving the middle rigid mold to rotate reversely by the straight wall main roller, simultaneously driving the annular blank to rotate reversely by the middle rigid mold, simultaneously controlling the core roller to make feeding motion along the radial direction towards the direction of the straight wall main roller, and enabling the holding roller to be in contact with the outer diameter of the middle rigid mold, wherein when the deformation of the annular blank reaches 5-8%, the outer diameter of the annular blank is attached to the inner hole of the middle rigid mold, wherein the rotating speed of the straight wall main roller is 1.2-1.5rad/s, the speed of the rolling ring is increased to 2-5mm/s, and the feeding speed of the core roller is 0.5-0.8 mm/s;

s6-5: when the outer diameter of the annular blank is completely attached to the inner diameter of the middle rigid mold, the annular blank and the middle rigid mold synchronously move, the angular speed and the linear speed of the annular blank and the middle rigid mold are kept consistent, the straight wall main roller is continuously controlled to rotate in the forward direction, and the core roller makes feeding motion along the radial direction towards the direction of the straight wall main roller, wherein the rotating speed of the straight wall main roller is 0.8-1.2rad/s, the rolling speed of the rolling ring is 0.5-1mm/s, and the feeding speed of the core roller is 0.3-0.6 mm/s.

Has the advantages that: the invention discloses an integral forming method of an axial special-shaped ring forging, which has the following advantages:

(1) The invention realizes the near-net forming production and manufacture of the axial special-shaped ring forging by introducing the intermediate rigid die, reduces the milling allowance, improves the utilization rate of raw materials, reserves the forging flow line, and reduces the raw material cost and the machining cost.

(2) The axial special-shaped ring forging piece manufactured by the method can realize uneven distribution of special shapes along the circumference, and the shapes of all axial section positions can be inconsistent, so that the method is suitable for forming various axial special-shaped ring forging pieces.

Drawings

FIG. 1 is a schematic structural view of a target ring forging of example 1;

FIG. 2 is a schematic structural view 2 of the target ring forging of embodiment 1;

FIG. 3 is a three-dimensional schematic view of a target ring forging of embodiment 1;

FIG. 4 is a schematic view 1 of a step 6 of ring rolling with an irregular inner hole in example 1;

FIG. 5 is a schematic view 2 of a ring rolling with an irregular inner hole in step 6 of example 1;

FIG. 6 is a schematic view 1 of an annular blank with a shaped inner hole obtained in step 6 of example 1;

FIG. 7 is a schematic view of the inner hole-shaped annular blank obtained in step 6 of example 1;

FIG. 8 is a schematic view of ring billet rolling 1 of step 7-4 in example 1;

FIG. 9 is a schematic view 2 of ring billet rolling in step 7-4 of example 1;

FIG. 10 is a schematic view of ring blank rolling 1 of step 7-5 in example 1;

FIG. 11 is a schematic view of ring billet rolling 2 of step 7-5 in example 1;

FIG. 12 is a schematic structural view 1 of the target ring forging of embodiment 2;

FIG. 13 is a schematic structural view of the target ring forging of embodiment 2;

FIG. 14 is a three-dimensional schematic view of the target ring forging of embodiment 2;

FIG. 15 is a schematic view of ring billet rolling 1 of step 6 in example 2;

FIG. 16 is a schematic view of ring blank rolling in step 6 of example 2;

FIG. 17 is a schematic view of ring billet rolling 1 of step 6-5 in example 2;

FIG. 18 is a schematic view of ring billet rolling at step 6-5 in example 2;

in the figure: the vertical wall core roller comprises a vertical wall main roller 1, a special-shaped core roller 2, a flange step 2-1, a middle rigid mold I3-1, a middle rigid mold II3-2, an axial groove 4, an annular blank 5 and a vertical wall core roller 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1 to 3, the axial special-shaped ring forging of the upper and lower inner end frame flanges of the outer axial stringer comprises the following specific forming steps:

step 1, forging and heating: 660kg of aluminum alloy bar (phi 500 multiplied by 1200) is put into a furnace at the temperature of less than or equal to 400 ℃, heated to 460 ℃, kept warm for 18h and then taken out of the furnace.

Step 2, multidirectional forging: the method comprises the following steps of performing multidirectional forging on a blank by adopting a press machine, improving the structure performance of the blank and obtaining a cylindrical blank, wherein the method comprises the following specific steps:

upsetting to 620 × 620 × 610 (Z-axial deformation 49.2%), elongating to 420 × 420 × 1350 (Z-axial deformation 54.8%), upsetting to 620 × 620 × 610 (Z-axial deformation 54.8%), elongating to 420 × 1350 × 420 (Y-axial deformation 54.1%), upsetting to 620 × 610 × 620 (Y-axial deformation 54.8%), elongating to 1350 × 420 × 420 (X-axial deformation 54.1%), upsetting to 610 × 620 × 620 (X-axial deformation 54.8%), and elongating to 420 × 420 × 1350 (Z-axial deformation 54.1%). In this example, the press forging press-down speed was controlled to 30mm/s. In the present invention, the dimensional units in all examples are mm.

Step 3, cake upsetting and punching: upsetting and rounding the cylindrical blank along the Z-axis direction until the size reaches phi 640 multiplied by 730 (the Z-axis deformation is 45.9%), then punching the cylindrical blank by using a cylindrical punch, wherein the size of an inner hole is phi 250, so that the annular blank with the hole is obtained, and the size is phi 665 (outer diameter) × phi 250 (inner diameter) × 730.

Step 4, pre-rolling and heating: heating the annular blank with the holes to 460 ℃, preserving heat for 11 hours, and discharging.

Step 5, pre-rolling: pre-rolling the annular blank with the hole on a horizontal ring rolling machine to an annular blank 5 with a rectangular axial section until the size is phi 1010 (outer diameter) x phi 800 (inner diameter) x 730 (the wall thickness deformation is 49.3%), wherein the rotating speed of a straight-wall main roller 1 is controlled to be 1.5rad/s, and the rolling ring speed is increased to be 10mm/s;

step 6, rolling the inner hole special-shaped ring: heating the annular blank to 5-460 ℃, preserving heat for 11h, and discharging; as shown in fig. 4 and 5, the heated annular blank 5 was subjected to female-hole-profile ring rolling using the profiled core roll 2 and the straight-wall main roll 1 to obtain an annular blank 5 having upper and lower inner end frame flanges (deformation amount 28.6%) as shown in fig. 6 and 7. In this embodiment 1, as shown in fig. 4, flange steps 2-1 are provided at two ends of a special-shaped core roll 2, a roll surface of the special-shaped core roll 2 is attached to an inner hole wall surface of an annular blank 5, a straight-wall main roll 1 is attached to an outer wall surface of the annular blank 5, and a rolling ring speed increase is controlled to be 6mm/s when a rotation speed of the straight-wall main roll 1 is 1.4 rad/s.

Step 7, axially rolling the ring in a special shape: heating the annular blank to 5-460 ℃, preserving heat for 10h, and discharging; and (3) placing the annular blank 5 in a middle rigid mold I3-1, and performing final rolling by using the middle rigid mold I3-1 in cooperation with the special-shaped core roller 2 and the straight-wall main roller 1 to obtain the special-shaped ring forging of the end frame flange in the outer axial stringer shown in the figures 1-3. The final rolling step of example 1 is specifically as follows:

step 7-1: preheating the intermediate rigid mold I3-1 to 350 ℃, and then placing the intermediate rigid mold on a working plane of a ring machine;

step 7-2: placing the heated annular blank 5 in a middle rigid mold I3-1, wherein the outer diameter of the annular blank 5 is smaller than the inner diameter of the middle rigid mold I3-1;

and 7-3: the special-shaped core roller 2 penetrates through an inner hole of the annular blank 5, and the intermediate rigid die I3-1 and the annular blank 5 are taken as a whole for rolling by a ring rolling machine;

and 7-4: the straight wall main roller 1 is controlled to rotate anticlockwise (in the embodiment, anticlockwise rotation is used as forward rotation), the straight wall main roller 1 drives the middle rigid mold I3-1 to rotate clockwise, meanwhile, the middle rigid mold I3-1 drives the annular blank 5 to rotate clockwise, meanwhile, the special-shaped core roller 2 is controlled to perform feeding motion along the radial direction towards the straight wall main roller 1, the holding roller is in contact with the outer diameter of the middle rigid mold I3-1, and when the deformation of the annular blank 5 reaches 6.0%, as shown in figures 8 and 9, the outer diameter of the annular blank 5 is attached to the inner hole of the middle rigid mold I3-1. Wherein the rotating speed of the straight wall main roller 1 is 1.3rad/s, the speed of the rolling ring is increased to 3mm/s, and the feeding speed of the special-shaped core roller 2 is 0.8mm/s.

And 7-5, after the outer diameter of the annular blank 5 is completely attached to the inner diameter of the middle rigid mold I3-1, synchronously moving the annular blank 5 and the middle rigid mold I3-1, keeping the angular speed and the linear speed of the annular blank and the middle rigid mold I3-1 consistent, continuously controlling the straight-wall main roller 1 to rotate anticlockwise as shown in figures 10 and 11, and enabling the special-shaped core roller 2 to perform feed motion along the radial direction towards the direction of the straight-wall main roller 1, so that an outer axial stringer is formed in the axial groove 4 of the middle rigid mold I3-1, and finally obtaining the target ring forging as shown in figures 1-3, wherein the rotating speed of the straight-wall main roller 1 is 1rad/s, the rolling ring increasing speed is 0.6mm/s, and the feed speed of the special-shaped core roller 2 is 0.4mm/s.

The specially-shaped ring forging of the upper and lower inner end frame flanges of the outer axial stringer manufactured in the embodiment 1 is taken, 3 parallel samples are taken randomly in the chord direction of the forging, the performance of the forging is tested, and the test result is as follows:

TABLE 1 results of performance testing of the ring forgings of example 1

	R _m （MPa）	R _p0.2 （MPa）	A（%）	Hardness (HB)
					Technical requirements	≥420	≥350	4.5～16	≥120
1	483	402	14.52	151
					2	480	399	15.40	152
3	495	416	14.20	151

Example 2

As shown in fig. 12 to 14, the axial stringer special-shaped ring forging comprises the following specific forming steps:

step 1, forging and heating: 1520kg of aluminum alloy bar (phi 650 multiplied by 1635) is put into a furnace at the temperature of less than or equal to 400 ℃, heated to 460 ℃ and kept warm for 18h, and then taken out of the furnace;

step 2, multidirectional forging: the method adopts a press machine to carry out multidirectional forging on the blank 5, improves the structure performance of the blank and obtains a cylindrical blank, and comprises the following specific steps:

upsetting to 825 × 825 × 800 (Z-axial deformation of 51.1%), elongating to 580 × 580 × 1600 (Z-axial deformation of 50%), upsetting to 825 × 825 × 800 (Z-axial deformation of 50%), elongating to 580 × 1600 × 580 (Y-axial deformation of 48.4%), upsetting to 825 × 800 × 825 (Y-axial deformation of 50%), elongating to 1600 × 580 × 580 (X-axial deformation of 48.4%), upsetting to 800 × 825 × 825 (X-axial deformation of 50%), elongating to 580 × 580 × 1600 (Z-axial deformation of 48.4%), and elongating to 48 × 580 × 1600 (Z-axial deformation of 48.4%). In this example, the press forging press-down speed was controlled to 30mm/s.

Step 3, upsetting cake punching: upsetting and rounding the cylindrical blank along the Z-axis direction until the size reaches phi 930 multiplied by 800 (the Z-axis deformation is 50%), and then punching the cylindrical blank by using a cylindrical punch until the size of an inner hole is phi 300, so that the annular blank with the hole is obtained, wherein the size is phi 955 (outer diameter) multiplied by phi 300 (inner diameter) multiplied by 800.

Step 5, pre-rolling: the annular blank with the holes is pre-rolled on a horizontal ring rolling machine to obtain an annular blank 5 with a rectangular axial section, the size of the annular blank is phi 1350 (outer diameter) multiplied by phi 1000 (inner diameter) multiplied by 800 (wall thickness deformation is 46.6 percent), the rotating speed of a straight-wall main roller is controlled to be 1.6rad/s, and the speed of a rolling ring is increased to be 12mm/s.

Step 6, axially rolling the ring in a special shape: heating the annular blank 5 to 450 ℃, keeping the temperature for 11h, discharging, placing the annular blank 5 in an intermediate rigid mold II3-2 shown in the figures 15 and 16, matching the intermediate rigid mold II3-2 with the straight-wall core roll 6 and the straight-wall main roll 1 for use, and finally rolling to obtain the outer axial stringer special-shaped ring forging shown in the figures 12-14. The final rolling step of this example is as follows:

step 6-1: preheating the intermediate rigid mold II3-2 to 350 ℃, and then placing the intermediate rigid mold on a working plane of a ring machine;

step 6-2: placing the heated annular blank 5 in the intermediate rigid mold II3-2, wherein the outer diameter of the annular blank 5 is smaller than the inner diameter of the intermediate rigid mold II3-2, as shown in fig. 15-16;

step 6-3: the straight-wall core roller 6 penetrates through an inner hole of the annular blank 5, and the intermediate rigid mold II3-2 and the annular blank 5 are taken as a whole to be rolled by a ring rolling machine;

and 6-4, controlling the straight-wall main roller 1 to rotate anticlockwise (in the embodiment, the anticlockwise rotation is taken as the forward rotation), driving the middle rigid mold II3-2 to rotate clockwise by the straight-wall main roller 1, simultaneously driving the annular blank 5 to rotate clockwise by the middle rigid mold II3-2, and simultaneously controlling the straight-wall core roller 6 to perform feeding motion along the radial direction towards the direction of the straight-wall main roller 1, wherein the holding roller is in contact with the outer diameter of the middle rigid mold II3-2, and after the deformation of the annular blank 5 reaches 5.7%, the outer diameter of the annular blank 5 is attached to the inner hole of the middle rigid mold II3-2, wherein the rotating speed of the straight-wall main roller 1 is 1.2rad/s, the speed increasing of a rolling ring is 2.5mm/s, and the feeding speed of the straight-wall core roller 6 is 0.5mm/s.

And 6-5, after the outer diameter of the annular blank 5 is completely attached to the inner diameter of the intermediate rigid mold II3-2, as shown in FIGS. 17 and 18, the annular blank 5 and the intermediate rigid mold II3-2 move synchronously, the angular speed and the linear speed of the two are kept consistent, the straight-wall main roller 1 is continuously controlled to rotate anticlockwise, the straight-wall core roller 6 makes feed motion along the radial direction towards the direction of the straight-wall main roller 1, so that an outer axial stringer is formed in the axial groove 4 of the intermediate rigid mold II3-2, and finally the target ring forging as shown in FIGS. 12-14 is obtained, wherein the rotating speed of the straight-wall main roller 1 is controlled to be 0.9rad/s, the rolling ring increasing speed is 0.8mm/s, and the feed speed of the straight-wall core roller 6 is 0.3mm/s.

The outer axial stringer ring forging manufactured in the embodiment 2 is taken, 3 parallel samples are taken randomly in the chord direction of the forging, the performance of the forging is tested, and the test result is as follows:

table 2 ring forging performance test results of example 2

	R _m （MPa）	R _p0.2 （MPa）	A（%）	Hardness (HB)
					Technical requirements	≥420	≥350	4.5～16	≥120
1	491	403	12.76	154
					2	486	398	14.04	155
3	488	399	13.64	155

In the invention, the axial special-shaped forming mechanism of the axial special-shaped ring forging is as follows:

(1) Rolling the annular blank by using the middle rigid mold to be matched with the core roller and the straight-wall main roller, so that the outer diameter of the annular blank is attached to the middle rigid mold;

(2) And continuously controlling the rotation of the straight-wall main roller, and simultaneously reducing the feeding speed of the core roller to continue rolling. At the moment, due to the constraint of the middle rigid mold, the outer diameter of the special-shaped ring forging is not increased any more, the inner diameter of the special-shaped ring forging is gradually increased, the wall thickness is reduced, the outer diameter material of the annular blank is gradually filled into the axial groove of the middle rigid mold according to the volume invariance principle, and then the outer axial stringer is formed on the outer circle of the annular blank.

In the invention, the arrangement of the axial groove of the middle rigid mold can be, but not limited to, the structure of the middle rigid mold in the above embodiment, can be designed according to the outer axial special-shaped structure of the actual axial special-shaped ring forging, and is suitable for forming various types of outer axial stringer ring forgings.

In the invention, the special-shaped structure of the special-shaped core roller is matched with the inner hole special-shaped structure of the target ring forging.

The integral forming method of the axial special-shaped ring forging can be applied to ring forgings of various high-temperature alloys, titanium alloys, aluminum alloys, magnesium alloys, stainless steel, steel and the like. Meanwhile, the excircle axial shape of the invention can be any continuous or discontinuous shape such as round, square, triangle and the like, and can be realized by adopting the method.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The integral forming method of the axial special-shaped ring forging is characterized by comprising the following specific steps of:

s2, multi-directional forging, namely performing multi-directional forging on the blank by adopting a press machine, and improving the structure performance of the blank to obtain a cylindrical blank;

controlling the straight wall main roller to rotate in the positive direction, driving the middle rigid mold to rotate in the reverse direction by the straight wall main roller, driving the annular blank to rotate in the reverse direction by the middle rigid mold, controlling the core roller to perform feeding motion along the radial direction towards the direction of the straight wall main roller, and contacting the outer diameter of the holding roller with the outer diameter of the middle rigid mold; when the outer diameter of the annular blank is completely attached to the inner diameter of the middle rigid mold, the annular blank and the middle rigid mold move synchronously, the angular speed and the linear speed of the annular blank and the middle rigid mold are consistent, the straight-wall main roller is continuously controlled to rotate in the positive direction, and the core roller performs feeding motion along the radial direction towards the direction of the straight-wall main roller.

2. The method of integrally forming an axially profiled ring forging of claim 1, wherein: the core roller is a straight-wall core roller or a special-shaped core roller.

3. The method of integrally forming an axially profiled ring forging of claim 2, wherein: and one end or two ends of the special-shaped core roller are provided with flange steps for carrying out inner hole special-shaped ring rolling on the annular blank, and an inner end frame flange is formed on the inner wall surface of the annular blank.

4. The method of integrally forming an axially profiled ring forging as claimed in any one of claims 2 to 3, wherein: the process of rolling the inner hole special-shaped ring by adopting the special-shaped core roller is positioned between the step S5 of pre-rolling and the step S6 of heating the axial special-shaped ring, and the specific steps are as follows:

5. The method of integrally forming an axially profiled ring forging of claim 1, wherein: the specific steps of S2 are as follows: upsetting and re-upsetting in the Z-axis direction, upsetting and elongating in the Y-axis direction and upsetting and elongating in the X-axis direction are sequentially carried out on the blank by adopting a press, finally, elongating is carried out in the Z-axis direction, the deformation amount of each pass is controlled to be 45-55%, and the forging pressing speed of the press is controlled to be 10-50 mm/s.

6. The method of integrally forming an axially profiled ring forging of claim 1, wherein: the specific steps of S3 are as follows:

and S3-2, punching the upset blank to form an annular blank with a preset size.

7. The method of integrally forming an axially profiled ring forging of claim 1, wherein: in S5, the pre-rolling deformation is controlled to be 45% -60%, the rotating speed of the straight wall main roller is 1.5-1.7rad/S, the rolling ring speed increasing is controlled to be 8-12 mm/S, and the blank is pre-rolled to an annular blank with a rectangular section.

8. The method of integrally forming an axially profiled ring forging of claim 4, wherein: in the step b, the deformation of the inner hole special-shaped rolling ring is controlled to be 25-40%, the rotating speed of the straight wall main roller is 1.2-1.5rad/s, and the speed increasing of the rolling ring is controlled to be 5-8 mm/s.

9. The method of integrally forming an axially profiled ring forging of claim 1, wherein: in the step S6, the middle rigid mold is an annular mold, at least one axial groove is distributed on the inner wall surface of the annular mold along the circumferential direction, and the axial groove is matched with the axial stringer of the target ring forging.

10. The method of integrally forming an axially profiled ring forging of claim 1, wherein: in S6, the ring rolling steps are as follows:

s6-1: preheating the middle rigid mold to 350-400 ℃, and then placing the middle rigid mold on a working plane of a ring machine;

s6-3: the core roller passes through the inner hole of the annular blank, and the intermediate rigid die and the annular blank are taken as a whole for rolling by a ring rolling machine;