CN118341886A - Integral forming device and method for thin-wall large-size negative-angle deep cavity product - Google Patents

Abstract

The invention discloses an integral forming device for a thin-wall large-size negative-angle deep cavity product, which comprises a male die, a blank pressing part and a female die; the outer surface of the male die comprises a first area and a second area along the deep drawing depth direction, the first area is matched with the inner surface of the product to be formed, and the second area is an approximate plane area; the female die comprises an outer frame and a plurality of inserts, when the inserts are positioned in the outer frame and are in a combined state, the combination of the inserts forms a cavity matched with the outer molded surface of the product, and when the inserts are lifted to a separation state relative to the outer frame, the demoulding is realized; the edge pressing component is of a fixed gap structure and is used for preventing wrinkling and sealing. The invention also discloses an integral forming method of the thin-wall large-size negative-angle deep cavity product, which comprises the steps of heating a male die to a preset drawing temperature to realize drawing of a blank; the female male die is sealed with the blank pressing component; matching the inflated blank with the cavity in the female die to realize negative angle forming; and (3) lifting each insert in the female die to a separated state, so as to realize demolding. The invention can realize the integral forming of complex negative angle products, and has the technical advantages of rebound control, controllable precision, weld elimination and stable quality.

Description

Integral forming device and method for thin-wall large-size negative-angle deep cavity product

Technical Field

The invention belongs to the technical fields of plastic processing technology and aerospace manufacturing, and relates to an integral forming device and method for a thin-wall large-size negative-angle deep cavity product.

Background

A shell of a certain model is a basic guarantee of cabin-out movement, is formed by combining and welding a left shell, a right shell and an upper arc plate, and has the advantages of penetrating weld joints, large number, easy deformation, uncontrollable rebound, and difficult problems of out-of-tolerance assembly precision, lengthy correction period, hybrid of various tools and the like. The integral structure shell can effectively overcome the difficulties, obviously improve the quality stability and the assembly precision, reduce the production period, but increase the forming difficulty index, and mainly appear in the following aspects:

(1) The negative angle area of the product accounts for 35 percent, the traditional process is difficult to form, and uneven wall thickness is very easy to cause;

(2) The outline of the product is of a box-shaped structure, the outline size is close to 1.0m, the forming depth exceeds 345mm, and the metamaterial limit deep drawing ratio is achieved;

(3) The product profile is provided with a plurality of local small characteristic areas, and the forming precision requirement is very high;

(4) The difficulty of demolding after the negative angle member is formed presents new challenges to the design of the mold structure.

In summary, the product with the integral structure can effectively avoid the problems of penetration of welding seams, large rebound, long shape correction period and the like caused by the traditional assembly welding products, but the negative angle component cannot realize integral forming by using the traditional conventional process.

Disclosure of Invention

The invention aims to overcome the defects, and provides a device and a method for integrally forming a thin-wall large-size negative-angle deep cavity product, which solve the technical problems of high rebound, penetration of welding seams and poor assembly precision caused by a traditional negative-angle component depending on a welding forming method. The invention can realize the integral forming of complex negative angle products, and has the technical advantages of rebound control, controllable precision, weld elimination and stable quality.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a thin-wall large-size negative-angle deep cavity product integral forming device comprises a male die, a blank pressing part and a female die;

the blank of the product to be formed is arranged between a male die and a female die, the male die is used for realizing the drawing of the blank, a blank pressing part is used for providing and sealing blank pressing force, and the drawn blank is subjected to air inflation treatment to realize the forming in a cavity in the female die;

The outer surface of the male die comprises a first area and a second area along the deep drawing depth direction, the first area is matched with the corresponding part of the inner surface of the product to be formed, and the second area is an approximate plane perpendicular to the deep drawing depth direction;

The female die comprises an outer frame and a plurality of inserts, when the inserts are positioned in the outer frame and are in a combined state, the inner side surfaces of the inserts are combined to form a cavity matched with the outer molded surface of a product to be formed, and when the inserts are lifted to a separation state relative to the outer frame, the demoulding of the product after forming is realized.

Further, the size of the second region of the male die is (120-130) x (70-80) mm;

In the stretching depth direction, the size of the first area of the male die is 80-90% of the whole size of the male die.

The design principle of the male die is as follows: and (3) carrying out finite element forming analysis to obtain the minimum wall thickness in the material forming process, judging whether cracking occurs according to the limiting thinning rate of the material, and if so, increasing the deep drawing depth to carry out material flow filling.

Further, the drawing depth is more than or equal to 300mm.

Further, the plurality of inserts of the female die comprise a bottom insert, a front insert, a rear insert, a left insert and a right insert;

the bottom insert is connected with the outer frame by adopting a vertical guide rail;

The front insert, the rear insert, the left insert, the right insert and the outer frame are connected by adopting inclined guide rails;

the angle of the inclined guide rail is equal to the draft angle, and the draft angle can achieve the avoiding angle of the negative angle area when the draft angle is the draft angle.

Further, a lifting shaft is connected to the bottom insert and extends out of the outer frame;

the lifting mechanism drives the bottom insert to move upwards along the vertical guide rail through the lifting shaft, and other inserts are driven by the bottom insert to move upwards along the inclined guide rail to realize separation.

Further, the device also comprises a blank pressing component;

The blank pressing component is used for pressing the blank edge of the product to be formed on the edge of the female die, and a gap t=0.95 t ₀ between the blank pressing component and the blank edge is formed, wherein t ₀ is the blank thickness.

Further, the blank edge of the product to be formed is pressed on the edge of the female die by adopting a blank pressing bolt, and the circumferential interval between adjacent pressing bolts is 150-300 mm.

Further, a first sealing groove is formed in the molded surface, in contact with the blank, of the blank, and the blank flows into the first sealing groove when being stressed, so that sealing between the blank and the blank is achieved.

Further, the male die is provided with a third sealing groove, the contact molded surface of the blank holder part and the male die is provided with a second sealing groove, auxiliary materials are arranged between the male die and the blank holder part, and the auxiliary materials flow into the second sealing groove and the third sealing groove under the action of blank holder force, so that the seal between the blank holder part and the male die is realized.

The forming process of the invention is divided into two parts which are continuously carried out, namely high-temperature drawing and high-temperature gas expansion, and the blank flange edge wrinkling must be prevented by edge pressing in the high-temperature drawing process due to the large drawing depth, and the edge pressing adopts a fixed clearance mode. After the deep drawing is finished, the male die is attached to the blank holder, the die is pressurized after the temperature is increased to a specified temperature, the blank and auxiliary materials are extruded to be filled into the sealing groove at the moment, so that the integral sealing of the male die to the blank is realized (the blank is filled into the first sealing groove 13 to finish the sealing of the blank and the blank holder under the action of the blank pressing force, and the upper side and the lower side of the auxiliary materials are respectively filled into the second sealing groove 14 and the third sealing groove 15 under the pressure of the male die to finish the sealing of the blank holder to the male die, so that the integral sealing of the male die to the blank is realized integrally.

The integral forming method of the thin-wall large-size negative angle deep cavity product is realized by adopting the integral forming device of the thin-wall large-size negative angle deep cavity product, and comprises the following steps:

placing a blank of a product to be formed between a male die and a female die, and enabling all inserts in the female die to be positioned in an outer frame to be in a combined state;

The blank is subjected to fixed-clearance blank pressing by the blank pressing component, so that deep drawing wrinkling is prevented;

heating the male die to a preset drawing temperature of 450+/-10 ℃ to carry out drawing of the blank;

pressurizing the equipment to 400T, and sealing the male die to the blank;

Heating the die to 500+/-10 ℃, filling external air into a female die cavity from a male die through an air pressure loading curve, and matching the inflated blank with the molded surface in the female die to realize inflation forming;

And (3) lifting each insert in the female die to a separation state relative to the outer frame, so as to realize demoulding of the molded product.

Compared with the prior art, the invention has at least one of the following beneficial effects:

(1) The invention creatively provides a forming device for integrally forming a large-scale negative angle structural product by high-temperature deep drawing and high-temperature air expansion, which can realize the integral forming reliability and quality consistency of complex components and lays a foundation for high-precision manufacture of large-size negative angle components;

(2) The invention adopts the design of the insert combined die to realize negative angle demolding, thereby reducing the repeated disassembly and assembly after the forming of the single insert;

(3) The structural design of the male die and the design of the approximate plane area can effectively prevent cracking caused by stress accumulation in the drawing process, and improve the uniformity of wall thickness distribution.

(4) The sealing structure designed by the invention can effectively complete integral continuous sealing among a plurality of parts;

(5) The high-temperature deep drawing and high-temperature air expansion method designed by the invention can effectively carry out high-precision forming of complex profiles with large size depth and negative angle. The difference between the high temperature drawing and the air expansion temperature is also an innovation point of the invention, and aims to reduce the drawing temperature so as to improve the uniformity of the wall thickness.

(6) The fixed-gap edge pressing bolt arrangement mode designed by the invention can effectively provide proper edge pressing force, overcomes the phenomenon that the flange edges are wrinkled when the box-shaped outline product is drawn, and simultaneously does not obstruct the forming flow of materials.

Drawings

FIG. 1 is a flow chart of the integral forming process of a thin-wall large-size negative-angle deep cavity product;

FIG. 2 is a diagram of a male mold structure of the present invention, wherein (a) a male mold diagram is initially designed, (b) a finite element analysis diagram of the male mold is initially designed, and (c) a point cloud diagram of the male mold is initially optimized; (d) a structural schematic diagram of the male die after iterative optimization;

FIG. 3 is a diagram of a negative angle area of a negative mold according to the present invention, wherein (a) is a diagram of a negative angle area of a product, (b) is a diagram of a combined structure of a negative mold insert, and (c) is a diagram of a negative angle member demolding;

FIG. 4 is a schematic view of a blank holder assembly of the present invention;

FIG. 5 is a schematic view of a negative angle forming integrated device according to the present invention;

FIG. 6 is a schematic view of a seal structure of the present invention;

In the figure, the 1-approximate plane area, the 2-negative angle area, the 3-bottom insert, the 4-front insert, the 5-rear insert, the 6-left insert, the 7-right insert, the 8-outer frame, the 9-lifting shaft, the 10-male mold, the 11-blank holder, the 12-female mold, the 13-first seal groove, the 14-second seal groove and the 15-third seal groove.

Detailed Description

The features and advantages of the present invention will become more apparent and clear from the following detailed description of the invention.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The invention relates to an integrated forming device and a method for integrally forming a thin-wall large-size negative angle deep cavity product with a negative angle area, wherein the wall thickness is 1-5 mm, the product contour dimension exceeds 1.0m, the forming depth exceeds 340mm, the integrated forming of the negative angle deep cavity component is realized by utilizing good plastic combination deep drawing and air inflation processes of materials at high temperature, the process integration and smooth demoulding of the negative angle component are realized by utilizing the integrated device, and the quality stability and the accuracy of the integrated forming of the negative angle component are improved.

The depth of the product exceeds 340mm, and a large-area negative angle area exists, so that the traditional cold stamping and warm forming are extremely easy to crack. The invention relates to a high-temperature deep drawing and high-temperature air expansion integrated forming method based on good plasticity development of materials at high temperature, which comprises the following steps: drawing the part to a preformed shape by adopting high-temperature pre-drawing, wherein the blank flange area is subjected to material flow material supplementing in the drawing process, so that the serious wall thickness reduction is prevented, and the blank flange area is prevented from wrinkling by adopting a fixed-gap edge pressing mode in the process; and then carrying out high-temperature air inflation final forming to finish high-precision manufacturing of the negative angle area and the small characteristic areas of the components.

The method can combine the advantages of uniform wall thickness, high efficiency and high temperature gas expansion in high temperature deep drawing, and can form complex shapes and near rebound quantity; the two secondary working procedures can be integrated into one set of die, so that the forming efficiency is obviously improved, and the manufacturing cost of the die is reduced; the formed part is of a negative angle integral structure, and has very high shape and position precision, almost no residual stress and excellent shaping property. The specific process flow of the invention is shown in figure 1.

In order to realize the method, the invention develops an insert combined female die, a fixed-gap blank pressing structure and a topology optimization male die integrating device (figure 5), which is the key for realizing the integral forming of the large-size negative-angle deep cavity component. The invention integrates the high-temperature deep drawing, high Wen Qizhang and negative angle demoulding functions into a set of tool, reduces the inter-process mould changing period and reduces the manufacturing cost. The forming device of the invention comprises a male die and a female die.

The male die is a high-temperature deep drawing part. The male mold surface directly determines whether the preformed component is cracked by deep drawing, excessively thinned in wall thickness and wrinkled in a flange area, and the reverse design iterative optimization is needed. As shown in fig. 3 (a), 3 (b) and 3 (c), in the drawings, the area above the red line is a negative angle area 2 (the negative angle at the 2.1 position is-39.6 degrees, the negative angle at the 2.2 position is-13.8 degrees, and the whole negative angle area exceeds 35 percent), and the initial design of the male mold surface of the invention discovers uneven wall thickness after forming through finite element analysis, because the continuity of the male mold surface is not high, the deep drawing bottom is a stress concentration point, the requirement on the smoothness of the male mold surface in the high-temperature deep drawing process is extremely high, the lowest point is always stressed in the deep drawing process, and the product is extremely easy to tear at the position. Selecting a point cloud profile with optimized curvature in the high-temperature air expansion process by finite element analysis; therefore, the invention further reversely optimizes the molding surface of the male die to be G2 continuous, and designs the drawing bottom molding surface of the male die to be a plane area 1, as shown in fig. 2 (d), the approximate plane area is 125 mm 75mm in size, so that the cracking caused by stress accumulation in the drawing process can be effectively prevented, and the uniformity of wall thickness distribution is improved. The deep drawing depth of the male die is coordinated with the high-temperature air expansion area to a certain extent, and the too small deep drawing depth can enable the material to be continuously thinned in the air expansion process, so that the wall thickness is seriously uneven in distribution and cracked; too large a depth of drawing increases the risk of cracking and wrinkling of the bottom of the drawing drastically, and the depth of drawing in the present invention cannot be less than 300mm. The male die is characterized in that the overall structure shape of the male die is required to be matched with a product to be formed, the deep drawing depth is required to be more than 300m, the deformation of the male die surface in the width direction of the deep drawing is required to be increased at a position (such as a 2.2 position) with obvious negative angle of the product, and the effect of supplementing and filling materials is achieved for the deformation of a negative angle area. And an approximate plane area is designed at the stress concentration position at the bottom of the male die, so that the stress concentration caused by overlarge drawing depth is prevented from generating drawing fracture. The bottom of the surface of the male die is provided with an air outlet, high-temperature air is sprayed out of the air outlet, and the drawn blank is inflated, so that the prestretched product is inflated into a curved surface to be formed.

The female mold in the device of the invention is a high Wen Qizhang and a demolding part. The profile of the female mold directly determines the precision of the final formed part, and in order to facilitate smooth demolding of the negative angle part (fig. 3 (a)) after Wen Qizhang a, the female mold is designed as an insert combination. After negative angle areas are identified, draft angle and lifting height are designed, the design parting surface is of five insert structures, namely a bottom insert 3, a front insert 4, a rear insert 5, a left insert 6 and a right insert 7, the inserts are combined together through an outer frame 8 (fig. 3 (b)), a vertical guide rail is adopted between the bottom insert and the outer frame, the front, the rear, the left and the right inserts are connected with the outer frame through a draft angle guide rail, a lifting shaft 9 of the bottom insert is relied on to vertically lift, the rest inserts are driven to move around, the whole insert structure is dispersed, negative angle areas are avoided, negative angle parts are taken out smoothly, and all the inserts are automatically reset and aligned under the action of gravity after product demoulding, so that product batch sequential production is completed. (FIG. 3 (c)).

The edge pressing component in the device prevents deep drawing wrinkling. The deep cavity box-shaped member is required to be deep drawn to prevent wrinkling, the blank pressing part 11 is designed to be of a fixed-clearance structure in the device, and a plurality of groups of M24 bolts are used for blank pressing force configuration. Because the deep drawing depth is large, the product opening is box-shaped, the material has different flow speeds at the edge of the opening and the fillet area, wrinkling is easy to generate, if the edge pressing force is insufficient, the wrinkling part flows to the product area along with the material to cause scrapping, and if the edge pressing force is excessive, the material has strong friction, poor fluidity and easy cracking. The fixed-gap blank pressing structural design is carried out by adopting a gap t=0.95t ₀, M24 blank pressing bolts are circumferentially arranged every 150-300 mm, a blank is positioned between a blank pressing part and a female die, the blank is pressed on the female die 12 by the blank pressing part through the blank pressing bolts, the blank flows obviously along the length direction, and the number of the blank pressing bolts is required to be arranged at the position (figure 4). High-temperature lubricant needs to be smeared between the blank and the blank pressing part 11 and between the blank pressing part and the bolt, so that friction force is reduced.

The sealing structure in the device provides an air-inflated forming closed cavity. The design of the blank pressing part increases the difficulty for sealing conditions, and the blank, the blank pressing part and the male die are required to be sealed simultaneously. As shown in fig. 6, the design seal structure in this scheme is: the contact profile of the blank-pressing part 11 and the blank is designed into a first sealing groove of 1.5 x 1mm, and the blank flows into the sealing groove to realize sealing when the blank is pressed by the blank-pressing force; the contact profile of the blank pressing part 11 and the male die 10 and the male die profile 10 are provided with a second sealing groove, the male die is provided with a third sealing groove, a layer of auxiliary material is added during forming, the upper surface and the lower surface of the auxiliary material are respectively filled into the second third sealing groove under the action of blank pressing force, the sealing between the male die and the blank pressing part is finished, and then the integral sealing between the male die and the blank is realized.

The high-temperature deep drawing and air inflation integral forming method and the integrated device provided by the invention based on the negative angle deep cavity component effectively realize the precise forming of the product, have batch production conditions, have stable process state, and meet the use requirements on the shape, position, size precision and mechanical property of the product. The method can integrate the advantages of uniform wall thickness in high-temperature deep drawing and high-temperature gas expansion forming precision, and effectively solves the problems of difficult forming, poor precision, difficult demoulding, uneven wall thickness and uncontrollable rebound of the negative angle component.

Particular advantages of the invention include:

1) The integral forming of the large-size negative angle deep cavity component is completed, the number of welding seams is effectively reduced, and the integral strength is improved;

2) The dimensional and dimensional precision of the product is less than or equal to 0.5mm, so that the overall assembly precision is improved;

3) The mechanical property of the product is not lower than 15% of the parent metal;

4) The multi-station integration and the multi-functional device integration effectively reduce the forming period and the manufacturing cost;

5) The product has no residual stress, very small rebound and excellent shaping property;

6) The insert combined structure completes the demoulding of the negative angle component.

In summary, the advanced method and apparatus for integrally forming a negative angle deep cavity member provides a more advanced forming path for complex members. The method can remarkably reduce the number of welding seams, reduce the shaping process, reduce the shaping period, improve the assembly precision, overcome the problems of rebound and the like, realize the integral shaping reliability and quality consistency of complex components, and lay a foundation for the subsequent high-precision construction of large-size negative angle components.

Examples:

The integral forming method of the thin-wall large-size negative angle deep cavity product can finish one-time integral forming of the complex-molded-surface negative angle product, and ensure forming precision. The method specifically comprises the following steps:

(1) Blank manufacturing: laser cutting machine conformal plate blank (840 x 1060 mm), coating the solder resist;

(2) High temperature deep drawing preforming:

1) Heating the die to a high-temperature drawing temperature of 450+/-10 ℃;

2) Placing the blank on a female die for positioning;

3) Blank and blank pressing part, blank pressing part and auxiliary material, and high-temperature lubricant is smeared between the auxiliary material and the male die;

4) The blank is tightly pressed by the blank pressing ring in a fixed-clearance mode;

5) Preserving heat for 10min, carrying out high-temperature deep drawing under a male die, wherein the front 200mm stroke is used for fast deep drawing, the speed is 20mm/min, the rear 100mm stroke is used for slow deep drawing, and the deep drawing speed is 2.5mm/min;

(3) High temperature air-expanding final forming:

1) Heating to 500+/-10 ℃;

2) Pressurizing and pressing the edge to 400T, and performing high-temperature sealing;

3) Checking air tightness;

4) High-temperature air inflation, the maximum air pressure is 1.2MPa/s, and the pressure maintaining time is 20min;

5) Cooling and taking a piece;

(4) Demolding the negative angle component: lifting the bottom insert, and enabling the female die insert to avoid a negative angle area to finish demolding;

(5) Three-dimensional cutting:

1) 3D cutting program is compiled according to the cutting outline;

2) Positioning the part physical characteristic points and the model characteristic points, and determining a reference;

3) Cutting lines;

4) Making three-dimensional cuts

(6) Surface treatment: pickling the surface, and chemically milling the thickness uniformly;

(7) Size detection: detecting the shape and position size and the outline size by three-dimensional scanning;

(8) Fluorescent examination: detecting microcracks;

(9) And (5) package delivery.

The invention has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the invention. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, and these fall within the scope of the present invention. The scope of the invention is defined by the appended claims.

What is not described in detail in the present specification is a well known technology to those skilled in the art.

Claims (10)

1. The integral forming device for the thin-wall large-size negative-angle deep cavity product is characterized by comprising a male die, a blank pressing part and a female die;

The blank of the product to be formed is arranged between a male die and a female die, the blank pressing part is used for preventing wrinkling and sealing of the blank, the male die is used for realizing drawing of the blank, and the drawn blank is subjected to inflation treatment to realize forming in a cavity in the female die;

The outer surface of the male die comprises a first area and a second area along the deep drawing depth direction, the first area is matched with the corresponding part of the inner surface of the product to be formed, and the second area is an approximate plane perpendicular to the deep drawing depth direction;

The female die comprises an outer frame and a plurality of inserts, when the inserts are positioned in the outer frame and are in a combined state, the inner side surfaces of the inserts are combined to form a cavity matched with the outer molded surface of a product to be formed, and when the inserts are lifted to a separation state relative to the outer frame, the demoulding of the product after forming is realized.

2. The integral forming device for a thin-wall large-size negative-angle deep cavity product according to claim 1, wherein the size of the second area of the male die is (120-130) x (70-80) mm;

In the stretching depth direction, the size of the first area of the male die is 80-90% of the whole size of the male die.

3. The integral forming device for the thin-wall large-size negative-angle deep cavity product, according to claim 1, wherein the deep drawing depth is more than or equal to 300mm.

4. The thin-wall large-size negative-angle deep cavity product integral forming device according to claim 1, wherein the plurality of inserts of the female mold comprise a bottom insert, a front insert, a rear insert, a left insert and a right insert;

the bottom insert is connected with the outer frame by adopting a vertical guide rail;

The front insert, the rear insert, the left insert, the right insert and the outer frame are connected by adopting inclined guide rails;

the angle of the inclined guide rail is equal to the draft angle, and the draft angle can achieve the avoiding angle of the negative angle area when the draft angle is the draft angle.

5. The integral forming device for thin-wall large-size negative-angle deep cavity products according to claim 4, wherein the bottom insert is connected with a lifting shaft which extends out of the outer frame;

the lifting mechanism drives the bottom insert to move upwards along the vertical guide rail through the lifting shaft, and other inserts are driven by the bottom insert to move upwards along the inclined guide rail to realize separation.

6. The thin-walled large-size negative angle deep cavity product integral forming device of claim 1, further comprising a binder component;

The blank pressing component is used for pressing the blank edge of the product to be formed on the edge of the female die, and a gap t=0.95 t ₀ between the blank pressing component and the blank edge is formed, wherein t ₀ is the blank thickness.

7. The integral forming device for the thin-wall large-size negative-angle deep cavity product, as claimed in claim 6, wherein the blank edge of the product to be formed is pressed on the edge of the female die by adopting a blank pressing bolt, and the circumferential interval of adjacent pressing bolts is 150-300 mm.

8. The integral forming device for the thin-wall large-size negative-angle deep cavity product, as claimed in claim 6, wherein a first sealing groove is formed in the surface, which is contacted with the blank, of the blank, and the blank flows into the first sealing groove to realize sealing between the blank and the blank when being stressed.

9. The integral forming device for the thin-wall large-size negative-angle deep cavity product according to claim 8, wherein the male die is provided with a third sealing groove, the contact molded surface of the blank holder part and the male die is provided with a second sealing groove, auxiliary materials are arranged between the male die and the blank holder part, and flow into the second sealing groove and the third sealing groove under the action of blank holder force, so that sealing between the blank holder part and the male die is realized.

10. A method for integrally forming a thin-wall large-size negative-angle deep-cavity product, characterized in that the method is realized by adopting the thin-wall large-size negative-angle deep-cavity product integral forming device as claimed in any one of claims 1 to 9, and comprises the following steps:

placing a blank of a product to be formed between a male die and a female die, and enabling all inserts in the female die to be positioned in an outer frame to be in a combined state;

The blank is subjected to fixed-clearance blank pressing by the blank pressing component, so that deep drawing wrinkling is prevented;

heating the male die to a preset drawing temperature of 450+/-10 ℃ to carry out drawing of the blank;

Pressurizing the deep-drawn blank by using equipment for 400T after deep drawing, and continuously sealing from a male die to a blank;

After the temperature is raised to 500+/-10 ℃, external air is filled into a female die cavity from a male die through an air pressure loading curve, and the blank is matched with the molded surface in the female die after being inflated, so that inflation forming is realized;

And (3) lifting each insert in the female die to a separation state relative to the outer frame, so as to realize demoulding of the molded product.

And (5) three-dimensional cutting part molding surface and surface treatment.