CN102941263B - Method for section bar bending blank manufacturing of nickel-based superalloy flash welding thin-wall annular member - Google Patents

Abstract

The invention discloses a profile bending method for thin-walled nickel-based superalloy flash welding thin-walled ring parts. The steps include: dividing the nickel-based superalloy profile blanked according to specifications into five sections of mn, no, op, pq and qw and heating After reaching 650°C±20°C, put it into the bending machine for positioning. Bending the op section first, the rotation speed of the upper roller and the two lower rollers of the bending machine is 2400mm/min, the speed of the upward movement of the two lower rollers is 6.0mm/min, and the bending is repeated 5 times. At this time, the op circle The arc section reaches the predetermined radius of curvature; then bend the no section and pq section, the rotation speed of the upper roller and the two lower rollers is 1200mm/min, the speed of the two lower rollers moving upwards is 7.6mm/min, repeat bending 5 times, at this time, the no and pq arc segments reach the predetermined radius of curvature. The profile is bent and deformed into a "D"-shaped ring blank, and the two straight sides of the ring blank are connected to the circular arc part through a transitional arc segment, which eliminates the knuckles caused by the connection between the two straight sides and the circular arc part. The phenomenon of indentation on the surface of the ring blank.

Description

Profile Bending Method for Flash Welding Thin-walled Rings of Nickel-Based Superalloys

technical field

The invention relates to a profile bending method, in particular to a profile bending blank-making method for nickel-based superalloy flash welding thin-walled rings.

Background technique

With the increasing demand for rings in industries such as aviation, aerospace, ships, gas turbines, wind energy, nuclear energy, and bearings, rings formed by traditional rolling methods not only waste a lot of materials due to large machining allowances and low material utilization , but also keeps the cost of ring parts high. The ring parts produced by the flash welding process have less machining allowance, high material utilization rate, and greatly reduce the cost, which is conducive to the development of ring forming technology in the direction of precision forming technology. The preparation technology of flash welding ring blank is one of the key technologies for producing flash welding ring parts.

In the prior art, the following methods are mainly used for the preparation of flash welded ring blanks: first, put the profile into the bending machine and bend it into an approximate circle, and leave a section of straight edge at each end of the profile; The straight side part and the arc part of the profile are bent into a knuckle, so that the straight sides at both ends of the profile are aligned with each other, which is convenient for the flash butt welding machine to clamp and weld the ring blank. The flash welded ring blank prepared by the above method will produce corners at the junction of the circular arc part of the ring blank and the straight edge parts at both ends, and easily produce indentations on the surface of the ring blank; the ring blank is formed into a ring by flash welding After bulging, it is necessary to carry out bulging and rounding treatment. During bulging, stress concentration is likely to occur at the knuckles and cause the ring to be scrapped. Elimination, the overall ellipticity of the ring after calibration is large; due to the small machining allowance of the flash welding ring, the large ellipticity of the ring and the indentation on the surface will affect the dimensional accuracy of the ring, resulting in low dimensional accuracy. It is beneficial to obtain flash welding ring parts with less and no allowance processing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for segmentally bending the profiles on the bending machine to realize the bending of nickel-based superalloy flash welded thin-walled ring profiles. The generated corners and indentations are beneficial to improve the dimensional accuracy and processing quality of flash welded ring parts.

In order to solve the above-mentioned technical problems, the profile bending blank-making method of nickel-based superalloy flash welding thin-walled rings according to the present invention, the technical solution includes the following steps:

Divide the nickel-based superalloy profiles cut according to the specifications into five sections: mn, no, op, pq and qw, and the ratio of each section is mn : no : op : pq : qw = 1.0 : 2.0～2.5 : 7.0～8.0 : 2.0～2.5 : 1.0 , then heat the profile to 650℃±20℃;

The profile is loaded into the bending machine, and it is positioned by the upper roll and two lower rolls of the bending machine so that the center of the profile is aligned with the center of the upper roll, and the upper roll and the two lower rolls are located the op segment of said profile;

Manipulate the upper roller to rotate counterclockwise and the two lower rollers to rotate clockwise to drive the profile to move to its right end, and at the same time apply a force of 292KN to the two lower rollers to move upward to press the profile. When the left lower roller When contacting the point o of the profile, change the rotation direction of the upper roller and the two lower rollers, and drive the profile to move to its left end; when the lower right roller contacts the point p of the profile, change the upper roller and the two lower rollers again In the direction of rotation, the profile is driven to move towards its right end until the upper roller contacts the midpoint of the op section of the profile; during the bending process, the two lower rollers always move upwards to press the profile; the linear speed of rotation of the upper and lower rollers is equal is 2400mm/min, and the moving speed of the two lower rollers is 6.0mm/min; repeat the above operation 5 times, at this time, the op arc section reaches the predetermined radius of curvature;

Stop the machine to detect the temperature of the profile, if it is greater than or equal to 450°C, continue the bending operation, if it is less than 450°C, return to the furnace and heat it to 650°C ± 20°C before continuing to bend the no section;

Position the no section of the profile on the bending machine so that the midpoint is aligned with the center of the upper roller; control the upper roller to rotate clockwise, and the two lower rollers to rotate counterclockwise, drive the profile to move to its left end, and simultaneously The two lower rollers are loaded with a force of 426KN to move upward to press the profile; when the lower right roller contacts the o point of the profile, the rotation direction of the upper roller and the two lower rollers is changed, and the profile is driven to move to the right end; when the lower left When the roller is in contact with the n point of the profile, the rotation direction of the upper roller and the two lower rollers is changed again, and the profile is driven to move to its left end until the upper roller contacts the midpoint of the no section of the profile; during the bending process, the two The lower roller always moves upwards to press the profile; the linear speed of rotation of the upper and lower rollers is 1200mm/min, and the moving speed of the two lower rollers is 7.6mm/min; repeat the above operation 5 times, the , the no arc segment reaches the predetermined radius of curvature;

Bend the pq section according to the steps of bending the no section above, until the pq arc section after bending reaches a predetermined radius of curvature, and the mn section and qw section of the profile are aligned.

Preferably, the radius of curvature of each curved arc segment is determined by the following formula:

$\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; \&delta;</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; \&delta;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}$

In the formula:

R——the radius of curvature of the corresponding arc segment after bending (mm);

a——the center distance between the two lower rollers (mm);

δ——the rising distance of the lower roller when the bending corresponds to the arc segment (mm);

r——the radius of the lower roller (mm);

d - the thickness of the profile (mm).

Preferably, the speed at which the lower roller moves upwards and the linear speed of rotation of the upper and lower rollers are determined by the following formula:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}{\mathrm{<span\; class="notranslate">\; n\&pi;R</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}$

In the formula:

V ₂ ——The speed at which the lower roller moves upward when bending the corresponding arc segment (mm/min);

V ₁ ——Rotation speed of the upper roller or lower roller when bending the corresponding arc segment (mm/min);

R——the radius of curvature of the corresponding arc segment after bending (mm);

δ——the rising distance of the lower roller when the bending corresponds to the arc segment (mm);

n——the number of repeated bending times (times) corresponding to the arc segment.

Preferably, the minimum force applied by the bending machine to the lower roller so that it can move upward to press the profile is determined by the following formula:

$\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; EJ</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}\mathrm{<span\; class="notranslate">\; arcsin</span>}\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; a\&delta;</span>}}{{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

In the formula:

F——The minimum force (N) that the bending machine loads on the lower roller so that it can move upward to press the profile;

EJ——the stiffness of the bar, where E is the modulus of elasticity (GPa), and J is the section moment of inertia of the bar (cm ⁴ );

a - the center distance between the two lower rollers (mm);

δ——The distance (mm) that the lower roller moves upward.

Preferably, the nickel-based superalloy is GH4169.

Preferably, the ring has an axial cross-sectional dimension of at most 65 mm x 30 mm.

The ring blank of the flash welded thin-walled ring bent and formed by the method is in the shape of "D", consisting of two straight sides, a circular arc part and an excessive arc section connecting the straight sides and the circular arc part. Openings are provided at opposite ends of the straight sides.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The profile bending blanking method of the nickel-base superalloy flash welding thin-walled ring of the present invention divides the profile into mn, no, op, pq and qw five sections during the bending process, and the ratio of each section is mn : no : op : pq : qw = 1.0 : 2.0～2.5 : 7.0～8.0 : 2.0～2.5 : 1.0 , so that the radius of curvature of the op section after bending is larger than that of the no or pq section, which is beneficial to bending deformation and obtaining a "D" shape Font ring blank. And after bending, the two straight sides of the ring blank are connected with the circular arc part through the transitional arc section, which eliminates the phenomenon of knuckles and indentations on the surface of the ring blank caused by the connection between the two straight sides and the circular arc part, which not only makes the billet The process is easy to carry out, and it also avoids the problem that the welded flash welded ring parts are prone to stress concentration at the knuckles in the subsequent bulging and rounding process, which will cause the ring to be scrapped; at the same time, it also makes the bulging and rounding process easy to carry out , can save a lot of man-hours and energy consumption, eliminate ovality, improve the dimensional accuracy and processing quality of ring parts, and obtain flash welded ring parts with less and no margin processing.

During the profile bending process, when the radius of curvature of each curved arc segment satisfies The speed at which the lower roll moves upward meets the rotational speed of the upper and lower rolls When it is used, it can make the smooth transition and bending shape between the curved arc segments.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of a ring blank of a flash welded thin-walled ring produced by the prior art.

Figure 2 is a schematic structural view of the bending machine.

Fig. 3 is a schematic diagram of sections of a nickel-based superalloy profile.

Figure 4 is a schematic diagram of the installation of nickel-based superalloy profiles.

Fig. 5 is a schematic diagram of the bending process of the op section of the nickel-based superalloy profile.

Fig. 6 is a schematic diagram of the bending process of the section no of a nickel-based superalloy profile.

Fig. 7 is a schematic diagram of the state of the nickel-base superalloy profile after bending.

Fig. 8 is a schematic diagram of a ring blank of a nickel-base superalloy flash welded thin-walled ring produced by the present invention.

Detailed ways

The implementation of the profile bending blanking method for nickel-based superalloy flash welding thin-walled rings according to the present invention requires provision of profile bending machines, heating furnaces, manipulators and other equipment.

Figure 1 shows a schematic diagram of a ring blank 10 of a nickel-base superalloy flash welded thin-walled ring produced by the prior art, the ring blank 10 is composed of two straight sides 11 and an arc portion 13, between the two straight sides There is an opening 14, and a knuckle 12 is formed at the intersection between the two straight sides 11 and the arc portion 13 respectively.

Fig. 2 has shown the schematic diagram of bending machine, and described bending machine 1 has upper roller 2 and two lower rollers 3, and described upper roller 2 is fixedly installed on the bearing 5, and described two lower rollers 3 are contained in two respectively. On a crank 4 and can move up and down, the upper roller 2 and the two lower rollers 3 are distributed in a triangle and can rotate clockwise or counterclockwise; the bending machine 1 also has the ability to adjust the upper roller 2, the two lower rollers 3 The speed of rotation of the roller 3 and the control device of the upper and lower moving speeds of the two lower rollers 3; the radius of the upper roller 2 and the two lower rollers 3 is 200mm, and the center distance between the two lower rollers 3 is 450mm.

Taking the nickel-based superalloy whose material grade is GH4169 in my country as an example, the specific implementation of the profile bending billet-making method of the nickel-based superalloy flash welding thin-walled ring according to the present invention is described in detail below:

The main chemical element content (percentage by weight) of the alloy is: C content ≤ 0.08%, Cr content 17.0% ~ 21.0%, Ni content 50.0% ~ 55.0%, Co content ≤ 1.0%, Mo content 2.80% ～3.30%, Al content 0.30%～0.70%, Ti content 0.75%～1.15%, Nb content 4.75%～5.50%, B content ≤0.006%, Mg content ≤0.01%, Mn content ≤0.35 %, Si content ≤0.35%, P content ≤0.015%, S content ≤0.015%, Cu content ≤0.30%, Ca content ≤0.01%, Pb content ≤0.0005%, Se content ≤0.0003% , The balance is Fe.

The specific process steps of bending billet are as follows:

Step 1: Cut the material. As shown in Figure 3, the GH4169 alloy material with a rectangular cross section is cut into a profile 20 according to the specifications, the length of the profile 20 is determined according to the diameter of the welding ring, and its maximum cross-sectional area is 65mm (width) × 30mm (thickness). . This profile 20 is divided into mn, no, op, pq and qw five sections by m, n, o, p, q, w, in order to make the curvature radius of the op section after bending greater than the curvature radius of the no or pq section and to obtain the shape For "D"-shaped ring blanks, the ratio of each segment is mn : no : op : pq : qw = 1.0 : 2.0～2.5 : 7.0～8.0 : 2.0～2.5 : 1.0 , and the section can be divided into sections 20 Separate the segments by means such as line markers.

Step 2: Heat up. Heat the profile 20 to 650°C±20°C, the holding time is 4min/10mm～5min/10mm, and the total holding time is less than 2h.

Step 3: Install the computer. As shown in Figure 4, the profile 20 is loaded into the bending machine 1, and the profile 20 is placed flat on the top of the two lower rollers 3 after the installation, and its center is aligned with the center of the upper roller 2, and the upper roller 2 and the two lower rollers 3 is located at the op section of the profile 20, the control crank 4 pushes the two lower rollers 3 to move upward until the profile 20 contacts the upper roller 2, and the upper roller 2 and the two lower rollers 3 position the profile 20 on the bending machine 1.

Step 4: Bend the op segment of the profile 20. As shown in Figure 5, control the upper roller 2 to rotate in the counterclockwise direction, and the two lower rollers 3 to rotate in the clockwise direction, and drive the profile 20 to move to its right end direction, and the rotational speeds of the upper and lower rollers 2 and 3 are equal. 2400mm/min, at the same time, load the force of 292KN on the two lower rollers 3 to make it move up to press the profile 20 at a speed of 6.0mm/min; when the left lower roller 3 contacts the o point of the profile 20, change the upper roller 2 and the rotation direction of the two lower rollers 3, the driving profile 20 moves to its left end direction, and ensures that the rotational speed of the upper roller 2 and the two lower rollers 3 is constant and the speed at which the two lower rollers 3 move upward is constant; When the lower right roller 3 is in contact with the p point of the profile 20, the rotation direction of the upper roller 2 and the two lower rollers 3 is changed again, and the profile 20 is driven to move to the right end direction, and the upper roller 2 and the two lower rollers 3 are ensured. The linear speed of rotation is constant and the speed at which the two lower rollers 3 move upwards is constant until the upper roller 2 comes into contact with the midpoint of the op section of the profile 20 . During the bending process, the two lower rollers 3 always move up the pressing profile 20 all the time. Repeat the above operation 5 times, at this time, the op arc segment reaches the predetermined radius of curvature.

Step 5: Stop the machine and check the temperature of the profile 20. If it is greater than or equal to 450°C, continue the bending operation. If it is less than 450°C, follow step 2 and return to the furnace to heat to 650°C±20°C before continuing to bend the section no. The holding time is halved.

Step 6: Bend the no segment of the profile 20. As shown in Figure 6, the no section of the profile 20 is placed on the two lower rollers 3 of the bending machine 1, the midpoint of the no section is aligned with the center of the upper roller 2; The upper roller 2 is in contact, and the profile 20 is positioned on the bending machine 1 by the upper roller 2 and the two lower rollers 3 . Control the upper roller 2 to rotate in the clockwise direction, and the two lower rollers 3 to rotate in the counterclockwise direction, and drive the profile 20 to move to its left end. The rotational speed of the upper roller 2 and the two lower rollers 3 are both 1200mm/min , at the same time, load the two lower rollers 3 with a force of 426KN so that they move up to press the profile at a speed of 7.6mm/min; when the lower right roller 3 contacts the o point of the profile 20, change the upper roller 2 and the two The direction of rotation of the roller 3 drives the profile 20 to move to its right end direction, and ensures that the rotational speed of the upper roller 2 and the two lower rollers 3 is constant and the speed of the upward movement of the two lower rollers 3 is constant; when the left lower roller 3 and When the n points of the profile 20 are in contact, change the rotation direction of the upper roller 2 and the two lower rollers 3 again, drive the profile 20 to move to its left end, and ensure that the rotational speed of the upper roller 2 and the two lower rollers 3 remains unchanged And the speed at which the two lower rollers 3 move upwards is constant until the upper roller 2 contacts the midpoint of the no section of the profile 20. During the bending process, the two lower rollers 3 always move up the pressing profile 20 all the time. Repeat the above operation 5 times, at this time, the no arc segment reaches the predetermined radius of curvature.

Step 7: Bend the pq section of the profile 20. The operation process is the same as step 6, until the curved pq arc segment reaches the predetermined radius of curvature. FIG. 7 is a schematic diagram of the state when the profile 20 is bent. At this time, the mn segment and the qw segment of the profile 20 are aligned. The radius of curvature of the pq arc segment=the radius of curvature of the no arc segment.

Fig. 8 shows the schematic diagram of the ring blank 20 of the GH4169 alloy flash welded thin-walled ring piece bent and formed by the method of the present invention. The transition arc segment 22 connecting the straight side 21 and the arc portion 23 is composed of an opening 24 at a position opposite to each other between the two straight sides.

Claims (7)

1. a shape bending blank-making method for nickel base superalloy flash welding thin-walled ring, is characterized in that, comprise the following steps:

Nickel base superalloy section bar by specification blanking is divided into mn, no, op, pq and qw five sections, and the ratio of described each section is mn: no: op: pq: qw= 1.0: 2.0 ~ 2.5: 7.0 ~ 8.0: 2.0 ~ 2.5: 1.0, more described section bar is heated to 650 DEG C ± 20 DEG C;

Described section bar is put into bending machine, is positioned, alignd with the center of described top roll in the center of described section bar by the top roll of bending machine and two lower rolls to it, described top roll and two lower rolls are positioned at the op section of described section bar;

Manipulate that described top roll rotates in the counterclockwise direction, two lower rolls are rotated in a clockwise direction, section bar is driven to move to its right-hand member direction, its top die mould material that moves up is made to the power of two lower rolls loading 292KN simultaneously, when the o point cantact of lower-left roller and section bar, change the direction of rotation of top roll and two lower rolls, drive section bar to move to its left end direction; When the p point cantact of bottom right roller and section bar, change the direction of rotation of top roll and two lower rolls again, drive section bar to move to its right-hand member direction, until the middle point cantact of top roll and section bar op section; In BENDING PROCESS, two lower rolls move up all the time always and push up die mould material; The linear velocity of described upper and lower roll is 2400mm/min, and the speed that described two lower rolls move up is 6.0mm/min; Repeat aforesaid operations 5 times, now, op arc section reaches predetermined radius of curvature;

Shut down the temperature detecting described section bar, if continue bending operation when being more than or equal to 450 DEG C, if be less than 450 DEG C, melt down after being heated to 650 DEG C ± 20 DEG C and continue bending no section again;

The no section of described section bar is positioned on bending machine makes its mid point align with the center of top roll; Manipulation top roll is rotated in a clockwise direction, two lower rolls rotate in the counterclockwise direction, drives section bar to move to its left end direction, makes its top die mould material that moves up to the power of two lower rolls loading 426KN simultaneously; When the o point cantact of bottom right roller and section bar, change the direction of rotation of top roll and two lower rolls, drive section bar to move to its right-hand member direction; When the n point cantact of lower-left roller and section bar, change the direction of rotation of top roll and two lower rolls again, drive section bar to move to its left end direction, until top roll contacts with the mid point of the no section of section bar; In BENDING PROCESS, two lower rolls move up all the time always and push up die mould material; The linear velocity of described upper and lower roll is 1200mm/min, and the speed that described two lower rolls move up is 7.6mm/min; Repeat aforesaid operations 5 times, now, no arc section reaches predetermined radius of curvature;

Pq section is bent by the step of above-mentioned bending no section, until the pq arc section after bending reaches predetermined radius of curvature, the mn section of described section bar and the alignment of qw section.

2. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to claim 1, is characterized in that: the radius of curvature of described each bending arc section is determined by following formula:

$R=\frac{a^2}{8\mathrm{\&delta;}}+\frac{1}{2}\mathrm{\&delta;}-r-d$

In formula:

R---the radius of curvature (mm) of corresponding circle segmental arc after bending;

A---the centre distance (mm) between two lower rolls;

δ---the distance (mm) that during bending corresponding circle segmental arc, lower roll rises;

The radius (mm) of r---lower roll;

The thickness (mm) of d---section bar.

3. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to claim 1, is characterized in that: the matching relationship of the linear velocity of the speed that described lower roll moves up and described upper and lower roll is determined by following formula:

$V_2=\frac{\mathrm{\&delta;}}{\mathrm{n\&pi;R}}{V}_1$

In formula:

V ₂---the speed (mm/min) that during bending corresponding circle segmental arc, lower roll moves up;

V ₁---the linear velocity (mm/min) of top roll or lower roll during bending corresponding circle segmental arc;

R---the radius of curvature (mm) of corresponding circle segmental arc after bending;

δ---the distance (mm) that during bending corresponding circle segmental arc, lower roll rises;

The number of times (secondary) of n---corresponding circle segmental arc repeated flex.

4. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to claim 1, is characterized in that: described bending machine loads to be determined by following formula to can the move up minimum force of top die mould material of lower roll:

$F=\frac{8\mathrm{EJ}(a^2+4{\mathrm{\&delta;}}^2)}{a^2(a^2-4{\mathrm{\&delta;}}^2)}\arcsin \frac{4\mathrm{a\&delta;}}{a^2+4{\mathrm{\&delta;}}^2}$

In formula:

F---bending machine loads the minimum force (N) of the top die mould material that can to move up to lower roll;

The rigidity of EJ---bar, wherein, the cross section moments of inertia (cm of E to be elastic modelling quantity (GPa), J be bar ⁴);

A---the centre distance (mm) between two lower rolls;

The distance (mm) that δ---lower roll moves up.

5. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to any one of claim 1 to 4, is characterized in that: described nickel base superalloy is GH4169.

6. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to any one of claim 1 to 4, is characterized in that: the axial cross section size of described ring is maximum is 65mm × 30mm.

7. the shape bending blank-making method of nickel base superalloy flash welding thin-walled ring according to any one of claim 1 to 4, it is characterized in that: adopt the ring base of the flash welding thin-walled ring of described method bending forming in " D " font, be made up of two straight flanges, arc sections and the transition circle segmental arc that connects described straight flange and arc sections, the position that end is relative between two straight flanges has opening.