CN113441577A

CN113441577A - Composite forming device and forming method for slender Z-shaped part

Info

Publication number: CN113441577A
Application number: CN202110571378.7A
Authority: CN
Inventors: 王军; 曾德标; 王高明; 谭书论
Original assignee: Chengdu Aircraft Industrial Group Co Ltd
Current assignee: Chengdu Aircraft Industrial Group Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-09-28
Anticipated expiration: 2041-05-25
Also published as: CN113441577B

Abstract

The invention relates to the technical field of manufacturing of plane sheet metal parts, in particular to a device and a method for compositely forming a slender Z-shaped part, wherein the forming device comprises a die body I, a cover plate and a die body II; the die body I is in a convex shape and forms working faces used for the working procedure A and the working procedure B respectively, the width of the working face of the working procedure B is matched with that of a web plate face of the Z-shaped part, and the shape of the inner side of the working face of the working procedure B is matched with that of the outer side of the working face of the working procedure A; the working surfaces are all provided with steps; the cover plate and the die body II are full profile surfaces, positioning pin avoiding grooves and matched die pin holes are formed in the cover plate and the die body II, and the matched die pin holes in the die body II are long round holes; the forming method comprises the steps of pressing the die body II to the die body I under the action of a rubber bag forming machine, and forming the bent edge B and simultaneously bending the edge A. By the forming device and the forming method, the problems of low forming efficiency, particularly large part resilience after forming of sunken side surfaces of the part, difficulty in die sticking of the part and large correction workload can be effectively solved.

Description

Composite forming device and forming method for slender Z-shaped part

Technical Field

The invention relates to the technical field of aircraft sheet metal part manufacturing, in particular to a composite forming device and a forming method for a slender Z-shaped part.

Background

At present, the known aircraft Z-shaped parts are supporting members of skin parts forming aerodynamic shapes, and due to the requirements of the aerodynamic shapes and functional layout of the aircraft, the Z-shaped parts have single-curved-surface shapes, double-curved-surface shapes, open angles or closed angles and complex shapes with one or more sunken parts. The profile accuracy of Z-shaped parts affects aircraft assembly, strength, surface quality, etc. How to produce Z-shaped parts with high quality and high efficiency is one of the important marks for measuring the aircraft manufacturing capability of a country. The parts are generally made into Z shapes by using rubber bags under high pressure, and the parts and a die are mainly formed in a one-to-one mode at present, so that the following defects are only existed: one set of mould takes shape a process, and the long and thin easy processing of Z shape part mould warp, also warp easily and arouse product quality super poor in the use, and the mould design needs to increase the mould width and increases the rigidity, causes the increase of mould material, and Z shape mould needs two sets of moulds, but the space that rubber bag forming machine once held is limited, and the utilization ratio of rubber bag forming machine is not high.

In the prior art, the publication number is: CN111229914A, patent name: the invention discloses a rubber forming method and a rubber forming device for a sheet metal frame part with different-direction bent edges, which solve the technical problems, and the technical scheme disclosed by the patent document is as follows: a sheet metal frame part rubber forming method and a forming die with different-direction beading are disclosed, the sheet metal frame part model comprises an arc web with equal curvature and a first beading and a second beading which are symmetrical, the forming die comprises a tire body and a cover plate matched with the tire body, the tire body comprises two forming stations, the inner side of the tire body is a first forming station matched with the first beading, the outer side of the tire body is a second forming station matched with the second beading, the inner surface of the cover plate is provided with an arc avoiding groove, an unfolded sheet metal frame part of the first sheet metal frame part is placed on the first forming station of the tire body for positioning, an unfolded sheet metal frame part of the second sheet metal frame part is placed on the second forming station of the tire body for first rubber forming, the first sheet metal frame part is placed on the second forming station of the tire body in an overturning manner, the second sheet metal frame part is placed on the first forming station of the tire body in an overturning manner, and (5) forming the rubber for the second time.

In the actual use process, the following problems can occur in the technical scheme:

1. the part is positioned through the positioning pin, the web surface of the part is wide during the first forming process, the part is not prone to lateral movement, the web surface of the slender part is narrow during the second forming process, in the scheme, the cover plate is provided with the avoiding groove, the contact part of the bottom surface of the cover plate and the web surface of the product is small, when the arc-shaped bent edge is formed particularly, the acting force of the rubber bag is exerted on the product during forming, the outward-pulling acting force is generated, the lateral movement is prone to occurring in the area without the positioning pin, and the forming quality of the part is affected. Because the cover plate is provided with the avoiding groove and the cushion block, the processing amount is large, the cover plate is easy to deform, the forming quality of parts is also influenced, and the cover plate is large in thickness, so that the cover plate is heavy and inconvenient to operate.

The height dimension of cushion and the thickness of product part all have the tolerance, and the apron atress is uneven, leads to part local crushing easily.

2. The bent edge formed for the first time cannot be corrected, the width of the web plate surface of the part is not easy to guarantee, and the assembly of the part is influenced; even if the avoiding groove is reduced, the cover plate and the supporting block are made into the molded surface which is the same as that of a formed part, and the cover plate cannot be assembled and disassembled due to the fact that the part has a closed angle.

3. This solution allows forming only two parts, either identical or symmetrical.

Disclosure of Invention

In order to solve the technical problems, the invention provides a device and a method for compositely forming a slender Z-shaped part, which can effectively solve the problems of low forming efficiency, particularly large part resilience after the side surface of the part is sunken and formed, difficulty in die sticking and large correction workload of the part.

The invention is realized by adopting the following technical scheme:

an elongated Z-shaped part composite forming device, which comprises a die body I, and is characterized in that: the die also comprises a cover plate and a die body II; the die body I is in a convex shape and forms operation surfaces which are used for a working procedure A and a working procedure B respectively, the width of the operation surface of the working procedure B is matched with the width of a web plate surface of the Z-shaped part, the inner side shape of the operation surface of the working procedure B is matched with the outer side of the operation surface of the working procedure A, and steps matched with sunken areas on the side surfaces of the Z-shaped part are arranged on the operation surfaces of the working procedure A and the working procedure B; the Z-shaped part is fixed on the operation surface of the die body I through a positioning pin; the cover plate and the die body II are in a full-profile flat plate shape, the cover plate is matched with the operation surface of the working procedure A, the die body II is matched with the operation surface of the working procedure B, positioning pin avoiding grooves and matched die pin holes are formed in the cover plate and the die body II, the cover plate and the die body II are respectively placed on the Z-shaped part after being positioned through the matched die pins, and the matched die pin holes in the die body II are long round holes; the process A is used for forming the bent edge A, and the process B is used for forming the bent edge B and correcting the bent edge A.

And a long round hole bushing is arranged on the die body II.

The distance between the working surfaces of the step A and the step B is 20-100 mm.

And lifting rings are arranged at two ends of the die body I, and a handle is arranged on the cover plate.

The clearance between the die body I and the side face of the cover plate is 0-0.1 mm, the draft angle of the outer side face of the cover plate is 0-30 degrees or 2-8 mm of straight edge is left for mold drawing, and then mold drawing is carried out.

A part material thickness gap is kept between the die body I and the die body II, the inner R of the die body I is less than or equal to the outer R of the part, and the die drawing oblique angle of the outer side surface of the die body II is 0-30 degrees.

The die body II is L-shaped.

The Z-shaped part is provided with at least three first positioning holes, the first positioning holes are positioned at two ends, one end of each first positioning hole is a round hole, and the other end of each first positioning hole is a long round hole; and a second positioning hole corresponding to the first positioning hole is further formed in the operation surface of the die body I, the unilateral clearance between the positioning pin and the first positioning hole is 0-0.1 mm, and the unilateral clearance between the positioning pin and the die body I is 0-0.1 mm.

A composite forming method of an elongated Z-shaped part is characterized in that: the method comprises the following steps:

designing a first positioning hole and a process lug on a Z-shaped part according to a three-dimensional digital model, determining the expansion appearance of the Z-shaped part, blanking according to the expansion appearance and manufacturing the first positioning hole;

ii, forming the part:

step A: positioning a Z-shaped part on a die body I by using a positioning pin, positioning a cover plate on the Z-shaped part by using a matched die pin, and forming a bent edge A on the sinking side by using a rubber bag hydraulic machine;

and a step B: taking down the Z-shaped part formed in the step 1, rotating the Z-shaped part by 180 degrees, positioning the Z-shaped part on the die body I by using a positioning pin, positioning the die body II on the Z-shaped part by using a matched die pin, pressing the die body II to the die body I under the action of a rubber bag forming machine, forming a bent edge B on the other side, and correcting the bent edge A formed in the step 1;

iii, after the forming is finished, milling and removing a part process lug;

and iv, checking the outline of the formed Z-shaped part, and correcting the unfolded outline of the Z-shaped part until the outline of the formed Z-shaped part meets the size requirement.

Compared with the prior art, the invention has the beneficial effects that:

1. in this application, can the simultaneous shaping two different beads of same part, can show improvement Z shape part shaping efficiency, reduce mould quantity and loading and unloading frequency. In the application, the cover plate and the die body II are flat plates with full molded surfaces, and compared with a comparison document, an avoiding groove does not need to be formed, so that the cover plate and the die body II are small in processing amount and difficult to deform; the cushion block is eliminated, the cover plate and the die body II can be uniformly pressed on the web surface of the part, and the stress is uniform. The process A is used for forming the bent edge A, and when the process B is used for forming the bent edge B, the matched die pin hole on the die body II is a long round hole, so that the die body II is pressed to the die body I under the action of a rubber bag forming machine, forming correction is carried out simultaneously, the manual correction workload is reduced, and in the process, the width size of the web plate surface of the part is directly formed, so that the width size precision of the web plate surface of the part is high, and when the part has a closed angle, the problem that a cover plate and the die body II cannot be assembled and disassembled can be avoided.

In the application, the working surfaces of the working procedure A and the working procedure B are provided with steps matched with the sunken areas on the side surfaces of the Z-shaped parts, so that the problems that the parts are large in resilience and not easy to be attached to a die after the side surfaces of the parts are sunken and formed can be effectively solved.

2. The die body II is provided with the long round hole lining, so that the abrasion of the long round hole can be reduced.

3. The distance between the working surfaces of the step A and the step B is 20-100 mm, and when the distance between the working surfaces of the step A and the step B is too small, the strength after processing is insufficient, the working surfaces are easy to deform in the using process, and the forming quality is influenced; too large distance wastes die material and increases the width dimension of the die.

4. The two ends of the die body I are provided with hanging rings, so that the die body I can be conveniently and integrally carried, and the cover plate is provided with a handle, so that the die body I is convenient to operate.

5. The gap between the die body I and the side face of the cover plate is 0-0.1 mm, the gap between the die body I and the side face of the cover plate is 0mm, the workload of die repair is large, and the cover plate is not easy to assemble and disassemble; when a gap of 0mm is required, the binding surfaces of the die body and the cover plate can be designed into inclined surfaces; the clearance is too large, the positioning of the cover plate and the die body I is inaccurate, and the positioning pin can be damaged under the forming acting force of the rubber bag. The oblique angle of the drawing die on the outer side surface of the cover plate is 0-30 degrees or a straight edge of 2-8 mm is reserved for drawing, the larger the thickness of the cover plate is, the forming of the rubber bag on the part is influenced, and the oblique angle of the drawing die on the outer side surface of the cover plate is beneficial to the forming of the part.

6. The die body II is L-shaped, so that the weight of the die body II is conveniently reduced.

7. In the forming method, because the elongated Z-shaped part die is easy to deform, the two processes are designed into a whole without specially increasing the rigidity of the die, thereby having the advantages of reducing the deformation of a forming device, saving die materials and the like. And the die body II is pressed to the die body I under the action of the rubber bag forming machine, and the die body II generates downward pressure and horizontal pressure under the forming acting force of the rubber bag.

8. After the bent edge A is formed in the process A, due to sinking and rebounding, a part is not easy to place in the process B, a part material thickness gap is kept between the die body I and the die body II, the inner R of the die body I is smaller than or equal to the outer R of the part, the R area has no assembly relation, a part web plate and the bent edge A are attached to other assembly parts, the part is easy to place in place, the shape correcting force acts on the bent edge A, and the shape correcting effect is good.

Drawings

The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:

FIG. 1 is a schematic representation of a closed angle part of the present invention prior to forming;

FIG. 2 is a schematic view of the invention in an expanded configuration;

FIG. 3 is a schematic diagram of a process arrangement of the present invention;

FIG. 4 is a schematic cross-sectional view of a forming apparatus according to the present invention;

FIG. 5 is a schematic structural view of a mold body I according to the present invention;

FIG. 6 is a schematic view of a bushing according to the present invention;

FIG. 7 is a schematic cross-sectional view of a process of the present invention;

FIG. 8 is a schematic view of a cross-section of the positioning of the components of the present invention;

FIG. 9 is an enlarged schematic view of a region P according to the present invention;

FIG. 10 is a schematic perspective view of a forming apparatus of the present invention;

the labels in the figure are:

1. the die body I, 2, the cover plate, 3, the die body II, 4, the step, 5, the Z-shaped part, 6, the positioning pin, 7, the positioning pin avoiding groove, 8, the matched die pin, 9, the bushing, 10, the hanging ring, 11, the handle, 12, the technical lug, 13, the matched die pin hole, 14, the first positioning hole, 15, the long round hole, 16, the working procedures A and 17, the working procedures B and 18, the bent edges A and 19 and the bent edges B.

Detailed Description

Example 1

As a basic embodiment of the invention, the invention comprises an elongated Z-shaped part composite forming device which comprises a die body I1, a cover plate 2 and a die body II 3. The mold body I1 is in a shape of a Chinese character 'tu', and forms working faces used for the working procedure A16 and the working procedure B17 respectively. The width of the working surface of the step A16 is larger than that of the working surface of the step B17, and the width of the working surface of the step B17 is matched with the width of the web surface of the Z-shaped part 5. The inner shape of the working surface in the step B17 is matched with the outer shape of the working surface in the step a 16, and the outer shape of the working surface in the step B17 may be the same as or different from the outer shape of the working surface in the step a 16. The working surfaces of the working procedure A16 and the working procedure B17 are both provided with steps 4 matched with sunken areas on the side surfaces of the Z-shaped parts 5. The Z-shaped part 5 is fixed on the operation surface of the die body I1 through a positioning pin 6.

The cover plate 2 and the die body II 3 are flat plates with full molded surfaces, and the die body I and the cover plate 2 are both attached to a product. The cover plate 2 is matched with the working surface of the working procedure A16, the die body II 3 is matched with the working surface of the working procedure B17, and the cover plate 2 and the die body II 3 are both provided with a positioning pin avoiding groove 7 and a matched die pin hole 13. The cover plate 2 and the die body II 3 are respectively positioned on the Z-shaped part 5 through the die pins 8. The matched die pin hole 13 on the die body II 3 is a long round hole 15. The process a 16 is for forming the bead a 18, and the process B17 is for forming the bead B19 and correcting the bead a 18.

The clearance between the die body I and the side face of the cover plate is 0-0.1 mm, the draft angle of the outer side face of the cover plate is 0-30 degrees or 2-8 mm of straight edge is left for mold drawing, and then mold drawing is carried out. Wherein, the side draft bevel angle is determined by the height of the product side bending edge.

Example 2

As a preferred embodiment of the invention, the invention comprises a composite forming device for an elongated Z-shaped part, wherein the formed Z-shaped part 5 comprises a bent edge A18, a bent edge B19 and a web. Referring to the attached drawing 10 of the specification, the forming device comprises a die body I1, a cover plate 2 and a die body II 3, in order to facilitate operation, two ends of the die body I1 are provided with lifting rings 10, and the cover plate 2 is provided with a handle 11.

Referring to fig. 5 of the specification, the mold body I1 is in a shape of a letter "convex" and forms working surfaces for the step a 16 and the step B17, respectively. Referring to FIG. 7 of the specification, the distance between the working surfaces of the step A16 and the step B17 is determined by considering the developed profile of the part step B17, and the L value is generally 20 to 100 mm. The width of the working surface of the step B17 is matched with the width of the web surface of the Z-shaped part 5, and the inner shape of the working surface of the step B17 is matched with the outer side of the working surface of the step A16.

In order to better match the side surface of the Z-shaped part 5 with the depressed area, referring to the attached figure 9 of the specification, the working surfaces of the process A16 and the process B17 are provided with steps 4 matched with the depressed area of the side surface of the Z-shaped part 5, and the steps 4 can be respectively positioned on the inner side of the working surface of the process A16 and the outer side of the working surface of the process B17. Referring to the attached

drawings

2 and 3 of the specification, the two ends of the Z-shaped part 5 are respectively connected with a technical lug 12, the Z-shaped part 5 and the technical lug 12 are both provided with a first positioning hole 14, the operation surface of the die body I1 is also provided with a second positioning hole corresponding to the first positioning hole 14, and the Z-shaped part 5 is fixed on the operation surface of the die body I1 through a positioning pin 6. The first positioning holes 14 located at the two ends can be round holes at one end and long round holes at the other end, so that the Z-shaped part 5 can be conveniently arranged, at the moment, the unilateral clearance between the positioning pin 6 and the first positioning hole 14 is 0-0.1 mm, and the unilateral clearance between the positioning pin 6 and the die body I1 is 0-0.1 mm. Or, the first positioning holes 14 are round holes, and in order to meet the precision of the Z-shaped part 5, the aperture of each first positioning hole 14 is increased by 0-0.2 mm.

The cover plate 2 and the die body II 3 are made into a sheet metal part full-molded surface which is in a flat plate shape. The cover plate 2 is matched with the size and the shape of the working surface of the working procedure A16, and the die body II 3 is matched with the size and the shape of the working surface of the working procedure B17. And positioning pin avoiding grooves 7 matched with the positioning pins 6 are formed in the cover plate 2 and the die body II 3. And the cover plate 2, the die body II 3 and the die body I1 are also provided with matched die pin holes 13, and the cover plate 2 and the die body II 3 are respectively positioned on the Z-shaped part 5 through the matched die pins 8. The matched die pin hole 13 on the die body II 3 is a long circular hole 15, and a long circular hole bushing 9 is arranged in the matched die pin hole 13, which can refer to fig. 4 and fig. 6 in the specification. In order to reduce the weight of the mold body II 3, the mold body II 3 may be L-shaped.

The clearance between the mold body I1 and the side surface of the cover plate 2 is 0-0.1 mm, in the embodiment, the oblique angle of the drawing mold on the outer side surface of the cover plate 2 is 15-30 degrees or a straight edge of 2-8 mm is left for drawing. The side face draft bevel angle is determined by the height of the product side face bent edge, the outer side face draft bevel angle of the cover plate 2 in the embodiment is 15-30 degrees, and when the height of the product side face bent edge is smaller, the outer side face draft bevel angle of the cover plate 2 can be 0 degree.

And a part material thickness gap is kept between the die body I1 and the die body II 3, namely, the die body I1 and the die body II 3 are attached to the inner surface and the outer surface of the formed part. The inner R of the die body I1 is less than or equal to the outer R of the part, wherein the inner R of the die body I1 specifically refers to an inner side bending fillet of the operation surface on the die body I1, the outer R of the part refers to a bending fillet of the outer side of the part, the outer side of the part is the side of the part close to the inner side of the die body I1, and specifically, the outer R of the part = the inner R + of the part and the material thickness of the formed part. The pattern drawing oblique angle of the outer side surface of the die body II 3 is 0-30 degrees. The unilateral clearance of locating pin 6 and first locating hole 14 is 0~0.1mm, and the unilateral clearance of locating pin 6 and die body is 0~0.1 mm.

Referring to the attached drawings 1 and 8, the process A16 is used for forming the bent edge A18, and the process B17 is used for pressing the die body II 3 to the die body I1 under the action of a rubber bag forming machine and is used for forming the bent edge B19 and correcting the bent edge A18.

Example 3

As another preferred embodiment of the present invention, the present invention comprises a method of composite forming an elongated Z-shaped part comprising the steps of:

designing a first positioning hole 14 and a process lug 12 on the Z-shaped part 5 according to a three-dimensional digital model, determining the unfolded appearance of the Z-shaped part 5, blanking according to the unfolded appearance and manufacturing the first positioning hole 14;

ii, forming the part:

step A16: positioning the Z-shaped part 5 on the die body I1 by using a positioning pin 6, positioning the cover plate 2 on the Z-shaped part 5 by using a matched die pin 8, and forming a bent edge A18 on the sinking side by using a rubber bag hydraulic machine;

step B17: taking down the Z-shaped part 5 formed in the step 1, rotating the Z-shaped part 5 by 180 degrees, positioning the Z-shaped part 5 on the die body I1 by using the positioning pin 6, positioning the die body II 3 on the Z-shaped part 5 by using the counter pin 8, pressing the die body II 3 to the die body I1 under the action of a rubber capsule forming machine, forming a bent edge B19 on the other side, and correcting a bent edge A18 formed in the step 1;

after forming is completed, milling to eliminate the technical lug 12 of the Z-shaped part 5;

and iv, checking the outline of the formed Z-shaped part 5, and correcting the unfolded outline of the Z-shaped part 5 until the outline of the formed Z-shaped part 5 meets the size requirement.

In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.

Claims

1. An elongated Z-shaped part composite forming device, comprising a die body I (1), characterized in that: the die also comprises a cover plate (2) and a die body II (3); the die body I (1) is in a convex shape and forms working surfaces which are used for a working procedure A (16) and a working procedure B (17), the width of the working surface of the working procedure B (17) is matched with the width of a web plate surface of the Z-shaped part (5), the inner side shape of the working surface of the working procedure B (17) is matched with the outer side of the working surface of the working procedure A (16), and steps (4) which are matched with sunken areas on the side surfaces of the Z-shaped part (5) are arranged on the working surfaces of the working procedure A (16) and the working procedure B (17); the Z-shaped part (5) is fixed on the operation surface of the die body I (1) through a positioning pin (6); the die body structure is characterized in that the cover plate (2) and the die body II (3) are in a full-profile flat plate shape, the cover plate (2) is matched with the operation surface of the working procedure A (16), the die body II (3) is matched with the operation surface of the working procedure B (17), the cover plate (2) and the die body II (3) are both provided with a positioning pin avoiding groove (7) and a matched die pin hole (13), the cover plate (2) and the die body II (3) are respectively positioned by a matched die pin (8) and then placed on a Z-shaped part (5), and the matched die pin hole (13) on the die body II (3) is a long round hole (15); the step A (16) is for forming the bead A (18), and the step B (17) is for forming the bead B (19) and correcting the bead A (18).

2. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: and a long round hole bushing (9) is arranged on the die body II (3).

3. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: the distance between the working surfaces of the step A (16) and the step B (17) is 20-100 mm.

4. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: two ends of the die body I (1) are provided with hanging rings (10), and the cover plate (2) is provided with a handle (11).

5. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: the clearance between the die body I (1) and the side face of the cover plate (2) is 0-0.1 mm, the draft bevel angle of the outer side face of the cover plate (2) is 0-30 degrees or 2-8 mm straight edges are left for mold drawing.

6. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: a part material thickness gap is kept between the die body I (1) and the die body II (3), the inner R of the die body I (1) is less than or equal to the outer R of the part, and the die drawing bevel angle of the outer side face of the die body II (3) is 0-30 degrees.

7. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: the die body II (3) is L-shaped.

8. An elongated Z-shaped part composite forming apparatus as set forth in claim 1 wherein: the Z-shaped part (5) is provided with at least three first positioning holes (14), the first positioning holes (14) are positioned at two ends, one end of each first positioning hole is a round hole, and the other end of each first positioning hole is an oblong hole; and a second positioning hole corresponding to the first positioning hole (14) is further formed in the operation surface of the die body I (1), the unilateral clearance between the positioning pin (6) and the first positioning hole (14) is 0-0.1 mm, and the unilateral clearance between the positioning pin (6) and the die body I (1) is 0-0.1 mm.

9. A composite forming method of an elongated Z-shaped part is characterized in that: the method comprises the following steps:

designing a first positioning hole (14) and a process lug (12) on a Z-shaped part (5) according to a three-dimensional digital model, determining the unfolded appearance of the Z-shaped part (5), blanking according to the unfolded appearance and manufacturing the first positioning hole (14);

ii, forming the part:

step a (16): positioning a Z-shaped part (5) on a die body I (1) by using a positioning pin (6), positioning a cover plate (2) by using a matched die pin (8), placing the cover plate on the Z-shaped part (5), and forming a bent edge A (18) on the sinking side by using a rubber bag hydraulic machine;

step B (17): taking down the Z-shaped part (5) formed in the step 1, rotating the Z-shaped part (5) by 180 degrees, positioning the Z-shaped part (5) on the die body I (1) by using a positioning pin (6), positioning the die body II (3) by using a pair of die pins (8), placing the die body II (3) on the Z-shaped part (5), pressing the die body II (3) to the die body I (1) under the action of a rubber capsule forming machine, forming a bent edge B (19) on the other side, and simultaneously correcting a bent edge A (18) formed in the step 1;

after the forming is finished, milling and removing a part process lug (12);

and iv, checking the outline of the formed Z-shaped part (5), and correcting the unfolded outline of the Z-shaped part (5) until the outline of the formed Z-shaped part (5) meets the size requirement.