Hot metal air expansion die meeting different forming functions

Abstract

The invention discloses a hot metal air expansion die meeting different forming functions. The hot metal air expansion die comprises an upper die and a lower die matched with the upper die. The upper die comprises a plurality of groups of upper die inserts, the lower die comprises a plurality of groups of lower die inserts, and the plurality of groups of upper die inserts and the plurality of groups of lower die inserts are respectively and correspondingly spliced to form a cavity for forming a pipe fitting; according to the invention, the cavity is formed by splicing the plurality of inserts, and the cooling water channel arranged along the boundary of the cavity is matched, so that the in-mold quenching of the pipe fitting after gas expansion forming is realized, and the combination of a pre-forming mold and a hot metal gas expansion forming mold is realized; the working contents of two procedures of preforming and hot metal gas bulging forming of the pipe fitting are completed by using the same set of die, so that the die manufacturing cost and the die development period are remarkably reduced, and the die has important significance in shortening the part development period and controlling the development cost.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high strength tube beam hot forming, and more particularly to a hot metal inflation die that meets different forming functions. Background Art

[0002] Hot metal inflation forming technology uses the effect of high-pressure gas to shape the heated metal material in the mold; this process has high precision, high strength and good material utilization, and is widely used in aerospace, automobile, construction and other fields.

[0003] The hot metal pneumatic forming process is generally used to manufacture pipe beam structures with complex shapes. The following steps are generally required: 1. Pipe making: pipe blanks with the diameter and length required by the manufacturing process; 2. Pipe bending: straight pipes are bent into the required shape using the pipe bending process; 3. Preforming: the required cross-sectional shape is preformed with a stamping die, and the cross-sectional shape creates favorable conditions for the hot metal pneumatic forming process in the next step; 4. Heating and austenitizing: the preformed parts are placed in a heating furnace and heated to about 950°, and kept warm for austenitizing; 5. Pneumatic forming: the heated parts are placed in a hot metal pneumatic forming die, and the inner cavity of the pipe beam is sealed with sealing pushers at both ends of the pipe beam. A gas nozzle is designed to inject high-pressure gas into the tube cavity, and the required shape of the product is formed by the inflation forming method. The hot metal inflation mold is in a pressure-maintaining state, and cooling water channels are designed in the upper and lower mold inserts to implement in-mold quenching on the tube beam. In this process, the production and manufacturing of the preforming mold and the hot metal inflation forming mold is one of the important factors affecting the early mold development cycle and cost. In the existing above-mentioned process, since two sets of molds are required to complete the preforming and hot metal inflation respectively, the mold development cycle is long and the cost is high. Therefore, a mold that meets both the preforming and hot metal inflation forming functions, that is, a hot metal inflation mold with different forming functions, is needed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, preforming and hot metal inflation forming require two sets of molds respectively, which has a long development cycle and high cost, and to propose a hot metal inflation mold that meets different forming functions.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A hot metal inflation die that meets different forming functions, comprising an upper die and a lower die matched with the upper die;

[0007] When the upper mold is spliced ​​with the lower mold, a cavity for forming the pipe fitting is formed inside.

[0008] Preferably, the upper mold includes multiple groups of upper mold inserts, and the lower mold includes multiple groups of lower mold inserts. The multiple groups of upper mold inserts and the multiple groups of lower mold inserts are respectively spliced ​​together to form a cavity for forming the pipe fitting.

[0009] Preferably, the upper mold insert and the lower mold insert at both ends of the mold cavity for forming the pipe fitting have a horizontal parting surface when spliced, so as to ensure effective sealing of the two ports in the inflation forming process.

[0010] Preferably, the upper mold insert is spliced ​​with the lower mold insert to form a cavity for forming the pipe fitting; the upper mold insert surface is divided into upper mold structure avoidance surface in the two side areas and upper mold insert part surface in the middle area at the splicing; the lower mold insert surface is divided into beveled surface in the two side areas and lower mold insert part surface in the middle area at the splicing. On the one hand, it is convenient to place the pipe fitting in the lower mold cavity, and on the other hand, it meets the forming needs of the two processes of preforming and hot metal inflation.

[0011] Preferably, a plurality of cooling water channels are provided in the upper mold insert and the lower mold insert, and the plurality of cooling water channels are evenly distributed along the periphery of the cavity.

[0012] Preferably, the direction of the cooling water channel is consistent with that of the mold cavity. The water channel is evenly arranged around the part surface, and the direction of the water channel is consistent with that of the part. The cooling water channel of the preforming process is blocked, and the cooling water channel of the bulging process is energized to achieve in-mold quenching of the part after bulging.

[0013] Preferably, a balancing block is further included, and both the upper mold insert and the lower mold insert are provided with a mounting surface, and the balancing block is arranged on the mounting surface.

[0014] Preferably, the upper mold comprises an upper mold base and an upper pad disposed on the upper mold base, and the upper mold insert is mounted on the upper pad;

[0015] The lower mold comprises a lower mold base and a lower pad arranged on the lower mold base, and the lower mold insert is installed on the lower pad.

[0016] Preferably, a first positioning column is provided on the lower die base, and a guide sleeve is provided on the first positioning column;

[0017] The upper die seat is provided with a second positioning column, the second positioning column is fixedly connected with a guide column, and the guide column is slidably connected in the guide sleeve to ensure the fitting accuracy between the upper die seat and the lower die seat profile.

[0018] Preferably, both ends of the cavity are provided with sealing pushers for sealing the pipe fittings, and both sealing pushers are connected to a high-pressure oil cylinder. The mold is designed with sealing pushers, and the sealing pushers are pressed into the tube cavity from the tube end under the action of the high-pressure oil cylinder in the inflation forming process to form an effective seal; the pre-forming process determines whether the sealing pushers are involved in the work according to the forming requirements.

[0019] Preferably, a stroke adjustment block is provided between the upper die seat and the lower die seat. The closing height of the upper and lower die inserts in the preforming process is different from that in the bulging forming process. The mold is designed with a stroke adjustment block, which is suitable for the preforming process and the bulging forming process respectively.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a hot metal inflation mold that meets different forming functions and has the following beneficial effects:

[0021] The present invention forms a cavity by designing an upper mold insert and a lower mold insert to be spliced ​​together. The cavity is an integrated cavity used for preforming and inflation forming of pipe fittings, so that a set of molds has both preforming and inflation forming functions, which can save the mold development cycle and reduce the mold manufacturing cost.

[0022] The present invention provides cooling water channels in the upper die insert and the lower die insert. The multiple water channels are evenly arranged around the part surface. The direction of the water channels is consistent with the direction of the part. The cooling water channels in the pre-forming process are blocked, while the cooling water channels in the inflation forming process are open. This achieves in-die quenching of the part after inflation forming, thereby ensuring that the mechanical properties of the part meet the design standards.

[0023] The present invention improves the stability of the cavity formed by splicing the upper mold insert and the lower mold insert through the support of the balance block; the parting surface of the tube end during splicing is a horizontal plane or is designed according to the product shape, which can ensure the effective sealing of the two ports in the inflation forming process.

[0024] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention forms a cavity by splicing multiple inserts, and cooperates with the cooling water channel arranged along the boundary of the cavity to realize the in-mold quenching of the parts after inflation forming. The present invention realizes the combination of the preforming mold and the hot metal inflation forming mold, and uses the same set of molds to complete the work content of the two processes of preforming and hot metal inflation forming of pipe fittings, which significantly reduces the mold manufacturing cost and the mold development cycle, and is of great significance to shortening the part development cycle and controlling the development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 The accompanying drawing is a schematic diagram of the overall structure provided by the present invention;

[0027] Figure 2 The accompanying drawing is a schematic diagram of the upper mold structure provided by the present invention;

[0028] Figure 3 The accompanying drawing is a schematic diagram of the lower mold structure provided by the present invention;

[0029] Figure 4 The accompanying drawing is a schematic diagram of the parting surface structure in the pipe end area when the upper mold insert and the lower mold insert provided by the present invention are spliced;

[0030] in:

[0031] 1. Upper mold; 2. Lower mold; 3. Upper mold insert; 4. Lower mold insert; 5. Cooling water channel; 6. Balance block; 7. Mounting surface; 8. Upper mold base; 9. Upper pad; 10. Lower mold base; 11. Lower pad; 12. First positioning column; 13. Second positioning column; 14. Guide column; 15. High-pressure cylinder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-4 , the embodiment of the present invention discloses a hot metal inflation mold that meets different forming functions, including an upper mold 1 and a lower mold 2 adapted to the upper mold 1;

[0034] When the upper mold 1 and the lower mold 2 are spliced ​​together, a cavity for forming the pipe fitting is formed inside.

[0035] Specifically, the upper mold 1 includes multiple groups of upper mold inserts 3, and the lower mold 2 includes multiple groups of lower mold inserts 4. The multiple groups of upper mold inserts 3 and the multiple groups of lower mold inserts 4 are respectively spliced ​​to form a cavity for forming the pipe fitting.

[0036] See also Figure 4 The upper mold insert 3 and the lower mold insert 4 located at both ends of the cavity for forming the pipe fitting have a horizontal parting surface when spliced, which can ensure effective sealing of the two ports in the inflation forming process.

[0037] Specifically, the upper die insert 3 and the lower die insert 4 are spliced ​​to form a cavity for forming the pipe fitting; the upper die insert 3 is divided into an upper die structure avoidance surface in the two side areas and an upper die insert part surface in the middle area at the splicing portion; the lower die insert 4 is divided into a beveled surface in the two side areas and a lower die insert part surface in the middle area at the splicing portion; on the one hand, it is convenient to place the pipe fitting in the forming groove, and on the other hand, it can meet the functional requirements of the two processes of preforming and inflation forming.

[0038] In order to further optimize the above technical scheme, multiple cooling water channels 5 are provided in the upper mold insert 3 and the lower mold insert 4. The multiple cooling water channels 5 are evenly distributed along the periphery of the cavity, and the direction of the multiple cooling water channels 5 is consistent with the direction of the cavity; the water channels are evenly arranged around the cavity or the part surface, and the direction of the water channels is consistent with the direction of the part or the cavity. Water is not passed through the cooling water channels 5 in the pre-forming process, and water is passed through the cooling water channels 5 in the inflation forming process, so as to realize in-mold quenching of the parts after inflation forming.

[0039] In order to further optimize the above technical solution, a balancing block 6 is further included. Both the upper mold insert 3 and the lower mold insert 4 are provided with a mounting surface 7 , and the balancing block 6 is arranged in the mounting surface 7 .

[0040] In order to further optimize the above technical solution, the upper mold 1 includes an upper mold base 8 and an upper pad 9 arranged on the upper mold base 8, and the upper mold insert 3 is installed on the upper pad 9;

[0041] The lower mold 2 includes a lower mold base 10 and a lower pad 11 disposed on the lower mold base 10, and the lower mold insert 4 is mounted on the lower pad 11;

[0042] In order to further optimize the above technical solution, a first positioning column 12 is provided on the lower die base 10, and a guide sleeve is provided on the first positioning column 12;

[0043] A second positioning column 13 is provided on the upper die seat 8 , and a guide column 14 is fixedly connected to the second positioning column 13 , and the guide column 14 is slidably connected in the guide sleeve.

[0044] In order to further optimize the above technical scheme, sealing pushers for sealing the pipe fittings are provided at both ends of the forming cavity, and the two sealing pushers are connected to a high-pressure oil cylinder 15; a sealing pusher is designed on the mold, and the sealing pusher in the inflation forming process is pressed into the tube cavity from the tube end under the action of the high-pressure oil cylinder 15 to form an effective seal; the pre-forming process determines whether the sealing pusher is involved in the work according to the forming requirements; the high-pressure oil cylinder 15 is arranged on the mounting block on the lower die base 10, and is used to press the sealing pusher at the open end of the pipe fitting; an air nozzle is designed on the sealing pusher, which can fill the tube cavity with high-pressure gas; and it is equipped with a high-pressure inflation system and a cooling water supply and discharge system and other structures.

[0045] In order to further optimize the above technical solution, a plurality of stroke adjustment blocks are provided between the upper die base 8 and the lower die base 10; the closing height of the upper and lower die inserts in the pre-forming process is different from the closing height of the upper and lower die inserts in the inflation forming process, and a special stroke adjustment block is designed on the mold, which is suitable for the pre-forming process and the inflation forming process respectively; the mold closing height during pre-forming and the mold closing height during final forming are adjusted according to the forming requirements, and are controlled by the stroke adjustment block.

[0046] The present invention forms a cavity by splicing a plurality of inserts, and cooperates with the cooling water channel 5 arranged along the boundary of the cavity to achieve in-mold quenching of the part after inflation forming. The present invention realizes the integration of the preforming mold and the hot metal inflation forming mold, and uses the same set of molds to complete the work contents of the two processes of preforming and hot inflation forming of the pipe fitting, which significantly reduces the mold manufacturing cost and the mold development cycle, and is of great significance to shortening the part development cycle and controlling the development cost.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot metal inflation die that meets different forming functions, characterized in that: It comprises an upper mold and a lower mold matched with the upper mold; When the upper mold is spliced ​​with the lower mold, a cavity for forming the pipe fitting is formed inside.

2. A hot metal inflation mold that meets different forming functions according to claim 1, characterized in that: The upper mold includes multiple groups of upper mold inserts, and the lower mold includes multiple groups of lower mold inserts. The multiple groups of upper mold inserts and the multiple groups of lower mold inserts are respectively spliced ​​correspondingly to form a cavity for forming the pipe fittings.

3. A hot metal inflation mold that meets different forming functions according to claim 2, characterized in that: The upper mold insert and the lower mold insert located at both ends of the cavity for forming the pipe fitting have a horizontal parting surface when spliced.

4. A hot metal inflation mold that meets different forming functions according to claim 2, characterized in that: The upper mold insert is spliced ​​with the lower mold insert to form a cavity for forming the pipe fitting; the upper mold insert surface is divided into an upper mold structure avoidance surface in the two side areas and an upper mold insert part surface in the middle area at the splicing point; the lower mold insert surface is divided into a bevel mouth surface in the two side areas and a lower mold insert part surface in the middle area at the splicing point.

5. A hot metal inflation mold satisfying different forming functions according to claim 2, characterized in that: A plurality of cooling water channels are arranged in the upper mold insert and the lower mold insert, and the plurality of cooling water channels are evenly distributed along the periphery of the cavity.

6. A hot metal inflation mold satisfying different forming functions according to claim 5, characterized in that: The direction of the cooling water channel is consistent with the direction of the cavity.

7. A hot metal inflation mold satisfying different forming functions according to claim 2, characterized in that: It also includes a balancing block. Both the upper mold insert and the lower mold insert are provided with mounting surfaces, and the balancing block is arranged on the mounting surfaces.

8. A hot metal inflation die satisfying different forming functions according to claim 2, characterized in that: The upper mold comprises an upper mold base and an upper pad arranged on the upper mold base, and the upper mold insert is installed on the upper pad; The lower mold comprises a lower mold base and a lower pad arranged on the lower mold base, and the lower mold insert is installed on the lower pad.

9. A hot metal inflation die satisfying different forming functions according to claim 8, characterized in that: The lower die base is provided with a first positioning column, and the first positioning column is provided with a guide sleeve; The upper die seat is provided with a second positioning column, the second positioning column is fixedly connected with a guide column, and the guide column is slidably connected in the guide sleeve.

10. A hot metal inflation die satisfying different forming functions according to claim 2, characterized in that: Both ends of the cavity are provided with sealing push heads for sealing the pipe fittings, and the two sealing push heads are connected with high-pressure oil cylinders.

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