CN115958109A - Internal high-pressure forming die and manufacturing method of beam part - Google Patents

Abstract

The invention relates to an inner high-pressure forming die and a manufacturing method of beam parts, wherein the inner high-pressure forming die comprises the following components: the pipe blank machining device comprises a first die with a first cavity and a second die matched with the first cavity, wherein the cavity wall of the first cavity is provided with a first limiting surface, a second limiting surface, a third limiting surface and a fourth limiting surface which extend along the second direction, the pipe blank part to be machined is located between the first limiting surface and the second limiting surface, and the third limiting surface and the fourth limiting surface are jointly used for limiting the degree of freedom of the pipe blank to be machined along the third direction. The inner high-pressure forming die can process the pipe blank to be processed into a preset shape; the utility model provides a manufacturing method of roof beam class spare, at the lock the in-process of second mould, follow the return bend is followed the relative both ends of second direction to fill liquid in the return bend and pressurize liquid to the roof beam class spare after making processing has the flanging structure who is used for connecting, thereby makes crossbeam and longeron can directly weld the dress through current vehicle cab welds the dress production line.

Description

Internal high-pressure forming die and manufacturing method of beam part

Technical Field

The invention relates to the technical field of manufacturing of vehicle cab floors, in particular to an internal high-pressure forming die and a manufacturing method of beam parts.

Background

In order to reduce the production cost of the vehicle and realize the light-weight production of the vehicle, the transverse beams and the longitudinal beams of the cab floor are processed by adopting an internal high-pressure forming process in the related art.

However, the closed contour is processed by the internal high-pressure forming process, so that the cross beam and the longitudinal beam cannot be welded through the existing vehicle cab welding production line, and cannot be directly connected with other components.

Disclosure of Invention

Therefore, it is necessary to prepare an inner high-pressure forming die capable of processing a flanging structure for welding and a manufacturing method of beam parts, so that the cross beam and the longitudinal beam can be directly welded through the existing welding production line of the vehicle cab and can also be directly connected with other components, thereby reducing the production cost.

According to an aspect of the present application, an inner high-pressure forming die for forming a tube blank to be worked is prepared, the inner high-pressure forming die comprising:

the first die is provided with a first cavity, and one side of the first die is sunken into the first die along a first direction; the first cavity is provided with a starting end and a terminating end, the cavity wall of the first cavity is provided with a first limiting surface and a second limiting surface which extend along the second direction, the first limiting surface and the second limiting surface are arranged oppositely in the third direction, and the pipe blank part to be processed is positioned between the first limiting surface and the second limiting surface; the cavity wall of the first cavity is provided with a third limiting surface and a fourth limiting surface which extend along the second direction, and the third limiting surface and the fourth limiting surface are arranged oppositely in the third direction and are used for limiting the degree of freedom of the tube blank to be machined along the third direction; and

the second die is matched with the first cavity and matched with the first die so as to machine the tube blank to be machined into a preset shape;

wherein a direction in which the starting end points to the terminating end is the second direction, and the first direction, the second direction and the third direction intersect with each other; the first limiting surface and the second limiting surface are positioned between the third limiting surface and the fourth limiting surface.

The inner high-pressure forming die is used for processing the pipe blank to be processed into a preset shape by arranging the first die and the second die which are matched with each other.

In one embodiment, the first mold is provided with two accommodating grooves which extend lengthwise along the second direction at intervals along the third direction, and a groove wall of one side of each of the two accommodating grooves, which is far away from each other, is respectively overlapped with the third limiting surface and the fourth limiting surface;

one of them the holding tank is located respectively between first spacing face and the third spacing face, another the holding tank is located between the spacing face of second and the fourth spacing face.

In one embodiment, the tube blank to be machined is provided with a preset contact part; the protruding conflict portion that is equipped with of second mould, conflict portion structure is when the second mould with when first mould cooperates, the conflict portion of second mould contacts first wait to process the preset contact site of pipe.

According to another aspect of the present application, there is provided a method of manufacturing a beam member including a cross member and a side member on a cab of a vehicle, using the inner high pressure forming die according to any one of claims 1 to 3, the method including the steps of:

preparing a straight pipe blank made of a preset material and with a preset wall thickness;

manufacturing the straight pipe blank into a bent pipe with a preset shape;

manufacturing the bent pipe with the preset shape into a beam part with a flanging structure by an internal high-pressure forming process;

wherein, the beam part with the flanging structure manufactured by the elbow pipe with the preset shape through the internal high-pressure forming process comprises the following steps:

and placing the bent pipe in the first die, filling liquid into the bent pipe from two opposite ends of the bent pipe along the second direction and pressurizing the liquid in the process of buckling the second die so as to expand the bent pipe, so that the bent pipe between the first limiting surface and the third limiting surface and the bent pipe between the second limiting surface and the fourth limiting surface respectively form a flanging structure.

In one embodiment, the step of manufacturing the straight pipe blank into the bent pipe with the preset shape is specifically as follows: and (3) manufacturing the straight pipe blank into a bent pipe with a preset shape through a pipe bending machine at normal temperature.

In one embodiment, after the straight pipe blank is manufactured into the bent pipe with a preset shape, the manufacturing method of the beam member further includes:

judging whether the section line length of the bent pipe is larger than a preset section line length;

and performing preforming treatment on the bent pipe through a preforming procedure under the condition that the length of the section line of the bent pipe is greater than the preset section line length.

In one embodiment, the preforming step comprises: and placing the bent pipe in a pre-forming die for local flattening treatment.

In one embodiment, the preforming step further comprises: and sequentially processing the bent pipes into pipes to be formed with different set shapes by performing along the longitudinal extension direction of the beam parts.

In one embodiment, the manufacturing of the bent pipe with the preset shape into the beam member with the flanging structure by the internal high-pressure forming process further includes:

sealing the opposite ends of the bent pipe respectively by using sealing punches;

pressurizing and bulging the liquid in the bent pipe, and simultaneously pushing the supplementary materials into the bent pipe by the two sealing punches respectively until the outer peripheral wall of the bent pipe is attached to the inner peripheral wall of the inner high-pressure forming die;

and increasing the pressure of the liquid to enable the transition area fillet on the elbow to be attached to the inner peripheral wall of the inner high-pressure forming die, so that the beam part with the flanging structure is obtained.

In one embodiment, the manufacturing of the bent pipe with the preset shape into the beam member with the flanging structure by the internal high-pressure forming process further includes: and punching a positioning hole on the bent pipe.

In one embodiment, after the bent pipe with the preset shape is manufactured into the beam member with the flanging structure through the internal high-pressure forming process, the manufacturing method of the beam member further includes: and finishing the flanging structure.

In one embodiment, the finishing of the flange structure specifically includes: and carrying out local finish machining on the flanging structure of the beam part through a stamping die.

In one embodiment, the beam member is provided with ends along opposite ends of its longitudinal extension; after the finishing of the flanging structure, the manufacturing method of the beam member further comprises the following steps: and finishing the two end parts and the positioning holes of the beam part.

In one embodiment, after the finishing of the flange structure, the method for manufacturing the beam further includes: and manufacturing an end flanging structure of the end part.

In one embodiment, before the preparing of the straight pipe blank with the preset material and the preset wall thickness, the method for manufacturing the beam part further comprises: and determining the position of the section to be reinforced, and welding pipe blanks with different materials or different material thicknesses from the straight pipe blank at the position of the section to be reinforced.

According to the manufacturing method of the beam part, in the internal high-pressure forming process, the bent pipe is placed in the lower die of the internal high-pressure forming die, and in the process of buckling the second die of the internal high-pressure forming die, liquid is filled into the bent pipe from the two opposite ends of the bent pipe for bulging, so that the processed beam part has a flanging structure for connection, the cross beam and the longitudinal beam can be directly welded through the existing vehicle cab welding production line, and can also be directly connected with other parts, and the production cost is reduced.

Drawings

FIG. 1 is a schematic process flow diagram of a conventional internal high pressure forming process in the related art;

FIG. 2 isbase:Sub>A schematic structural view andbase:Sub>A schematic sectional view A-A ofbase:Sub>A conventional beam member processed by an internal high pressure forming process in the related art;

FIG. 3 is a schematic process flow diagram of an internal high pressure forming process in one embodiment of the present application;

FIG. 4 is a schematic diagram illustrating an abutting connection between an abutting portion and a predetermined contact portion according to an embodiment of the present application;

FIG. 5 is a schematic connection diagram of a cross beam and a longitudinal beam with flanging structures in one embodiment of the application;

FIG. 6 isbase:Sub>A schematic cross-sectional view A-A of FIG. 2 and B-B and C-C of FIG. 5;

FIG. 7 is a schematic flow chart of a method of making a beam member according to the present application;

FIG. 8 is a schematic structural view of an elbow according to an embodiment of the present application;

FIG. 9 is a schematic view of a pre-formed elbow configuration and cross-sections D-D, E-E, and F-F according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a portion of a beam assembly according to an embodiment of the present application;

FIG. 11 is a schematic cross-sectional view of H-H in FIG. 10.

The reference numbers illustrate:

10. an inner high pressure forming die; 11. a first mold; 111. a first cavity; 1111. a first limit surface; 1112. a second limiting surface; 1113. a third limiting surface; 1114. a fourth limiting surface; 1115. accommodating grooves; 12. a second mold; 121. a contact part; 20. a beam-like member; 21. a stringer; 22. a cross beam; 23. a flanging structure; 30. a pipe blank is to be processed; 31. presetting a contact part; 41. an upper die cavity; 42. a lower mold cavity; 50. stamping parts;

x: a first direction; y: and a third direction.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

FIG. 1 is a schematic process flow diagram of a conventional internal high pressure forming process in the related art; fig. 2 isbase:Sub>A schematic structural view andbase:Sub>A schematic sectional viewbase:Sub>A-base:Sub>A ofbase:Sub>A beam member processed bybase:Sub>A conventional internal high pressure forming process in the related art.

Referring to fig. 1 and 2, in the related art, when a cross beam 22 and a longitudinal beam 21 (both referred to as a beam 20 in this application) of a vehicle are manufactured, an upper die cavity 41 and a lower die cavity 42 are closed first by a conventional internal high pressure forming process, and then a pipe blank 30 to be processed in the closed cavities is filled with high pressure liquid to realize bulging, so that the pipe blank 30 to be processed is processed into a required shape. However, because the traditional internal high-pressure forming process is to seal the upper die cavity 41 and the lower die cavity 42 and then expand the tube blank 30 to be processed, the flanging structure 23 for spot welding connection cannot be processed by the process (see fig. 2, along the axial direction of the beam member 20, fig. 2 showsbase:Sub>A sectional view ofbase:Sub>A plurality of positionsbase:Sub>A-base:Sub>A), the processed beam member 20 cannot be welded by the existing cab welding production line without the flanging structure 23, and parts such as the floor, the cross beam 22, the longitudinal beam 21 and the like cannot be welded, and parts such as the left floor, the right floor, the middle floor, the rear floor, the front wall inner plate, the rear wall lower cross beam and the like need to be greatly modified in structure in order to be matched with the beam member 20.

Therefore, in order to solve the problem that the beam member 20 with the flanging structure 23 cannot be machined by the traditional internal high-pressure forming process, the application prepares an internal high-pressure forming die 10 and a manufacturing method of the beam member.

FIG. 3 is a schematic process flow diagram of an internal high pressure forming process in one embodiment of the present application; FIG. 4 is a schematic diagram illustrating an abutting connection between an abutting portion and a predetermined contact portion according to an embodiment of the present application; FIG. 5 is a schematic connection diagram of a cross beam and a longitudinal beam with flanging structures in one embodiment of the application; FIG. 6 isbase:Sub>A schematic cross-sectional view of A-A in FIG. 2 and B-B and C-C in FIG. 5.

Referring to fig. 3 to 5, an internal high-pressure forming die 10 is prepared for forming a tube blank 30 to be processed, the internal high-pressure forming die 10 includes a first die 11 and a second die 12 which are matched with each other, the first die 11 is provided with a first cavity 111 for placing the tube blank 30 to be processed, and the first die 11 and the second die 12 are matched with each other to process the tube blank 30 to be processed into a preset shape. In this way, the first die 11 and the second die 12 are matched with each other, so that the tube blank 30 to be processed is processed into a preset shape.

One side of the first mold 11 is recessed into the first mold 11 along a first direction (indicated by X in fig. 3) to form a first cavity 111; the first cavity 111 has a start end (not shown in the figure) and a stop end (not shown in the figure), the cavity wall of the first cavity 111 has a first limit surface 1111 and a second limit surface 1112 extending along the second direction (not shown in the figure), the first limit surface 1111 and the second limit surface 1112 are arranged opposite to each other in the third direction (shown as Y in fig. 3), and the part of the tube blank 30 to be processed is located between the first limit surface 1111 and the second limit surface 1112; the cavity wall of the first cavity 111 has a third limiting surface 1113 and a fourth limiting surface 1114 extending along the second direction, and the third limiting surface 1113 and the fourth limiting surface 1114 are arranged opposite to each other in the third direction and are used for limiting the degree of freedom of the tube blank 30 to be processed along the third direction. The second die 12 is matched with the first cavity 111, and the second die 12 is matched with the first die 11 to machine the tube blank 30 to be machined into a preset shape. The direction from the starting end to the terminating end is a second direction, and the first direction, the second direction and the third direction are intersected with each other; the first position-limiting surface 1111 and the second position-limiting surface 1112 are located between the third position-limiting surface 1113 and the fourth position-limiting surface 1114.

In this way, the first die 11 and the second die 12 are matched with each other, so that the tube blank 30 to be processed is processed; the position of the tube blank 30 to be machined in the first cavity 111 is limited by arranging the first limiting surface 1111 and the second limiting surface 1112; by arranging the third limiting surface 1113 and the fourth limiting surface 1114, the degree of freedom of the tube blank 30 to be processed along the third direction is limited, so that the tube blank 30 to be processed can be formed conveniently.

Furthermore, the first mold 11 is provided with two longitudinally extending accommodating grooves 1115 along the second direction at intervals along the third direction, and a side groove wall of the two accommodating grooves 1115 away from each other is respectively connected with the third limiting surface 1113 and the third limiting surface 1113

The four limiting surfaces 1114 are overlapped; one of the receiving grooves 1115 is respectively located between the first limiting surface 1111 and the third limiting surface 1113, and the other receiving groove 1115 is located between the second limiting surface 1112 and the fourth limiting surface 1114. In this way, by providing the two accommodation grooves 1115, the tube blank 30 to be processed can partially enter the accommodation grooves 1115 during the bulging process, so that the flanging structure 23 is formed.

Further, the blank tube 30 to be worked has a preset contact portion 31; the second mold 12 is convexly provided with an interference

And a part 121, wherein the interference part 121 is configured such that when the second die 12 is matched with the first die 11, the interference part 121 of the second die 12 contacts the preset contact part 31 of the pipe blank 30 to be processed firstly. It should be noted that the control of the preset contact portion 31 and the interference portion 121 is the key for forming the flanging structure 23, otherwise, the beam member 20 may occur

The size of the flange structure 23 on one side is smaller, and the residual material of the flange structure 23 on the other side is excessive (see figure 5 and figure 4). The preset contact part 31 is determined by an operator according to operation experience debugging, the preset contact part 31 can be regulated and controlled by controlling and adjusting the forming angle of the tube blank 30 to be processed, and can also be regulated and controlled by changing the concave section shape of the tube blank 30 to be processed, and the concave section shape can be seen in fig. 6. The abutting portion 121 is a portion which comes into contact with the pipe blank 30 to be processed first when the second die 12 moves in the first direction toward the first die 11.

0, the inner high pressure forming die 10 is used for processing by adopting an inner high pressure forming process

The beam member 20 with the flanging structure 23 can be used for processing a cross beam 22 and a longitudinal beam 21 with the flanging structure 23 (refer to the cross sections B-B and C-C in the figure 6) by adopting the internal high-pressure forming process of the application so as to meet the connection requirement.

Fig. 7 is a schematic flow chart of a method for manufacturing the beam member according to the present application.

Referring to fig. 7, in accordance with a general inventive concept, the present application also provides a method for manufacturing a beam member, the beam member 20 includes a cross member 22 and a side member 21 of a cab of a vehicle, the method for manufacturing the beam member 20 uses the inner high pressure forming mold 10 of any one of the above embodiments, and the method for manufacturing the beam member 20 includes the following steps:

s110: preparing a straight pipe blank made of a preset material and with a preset wall thickness;

s120: manufacturing a straight pipe blank into a bent pipe with a preset shape;

s130: manufacturing the bent pipe with a preset shape into a beam part 20 with a flanging structure 23 by an internal high-pressure forming process;

wherein, step S130 specifically includes: the bent pipe is placed in the first mold 11, and in the process of buckling the second mold 12, liquid is filled into the bent pipe from the two opposite ends of the bent pipe along the second direction and is pressurized so as to expand the bent pipe, so that the bent pipe between the first limiting surface 1111 and the third limiting surface 1113 and the bent pipe between the second limiting surface 1112 and the fourth limiting surface 1114 respectively form a flanging structure 23.

Thus, in the internal high-pressure forming process, the bent pipe is placed in the first die 11 of the internal high-pressure forming die 10, and in the process of buckling the second die 12 of the internal high-pressure forming die 10, liquid is filled into the bent pipe from the two opposite ends of the bent pipe for bulging, so that the processed beam part 20 has the flanging structure 23 for connection, and the cross beam 22 and the longitudinal beam 21 can be directly welded through the existing vehicle cab welding production line and also can be directly connected with other parts, and the production cost is reduced.

Fig. 8 is a schematic structural diagram of an elbow according to an embodiment of the present application.

Referring to fig. 8, in step S120, a straight pipe blank is formed into a bent pipe having a predetermined shape by a pipe bender at a normal temperature. It will be appreciated that the purpose of machining a straight tube blank into a bent tube is to initially establish a three-dimensional spatial profile of the beam member 20 for subsequent further machining of the bent tube by an internal high pressure forming process.

After step S120, the method for manufacturing the beam member 20 further includes: judging whether the section line length of the bent pipe is larger than the preset section line length;

and performing pre-forming treatment on the bent pipe through a pre-forming procedure under the condition that the length of the section line of the bent pipe is larger than the preset section line.

It should be noted that, the preset cross-sectional line length means that, along the axial direction of the bent pipe (the axial direction is the direction a in fig. 8), the circumferential dimension of the cross section of the bent pipe is equal to the corresponding circumferential dimension of the inner high-pressure forming die 10, that is, the bent pipe just can be placed in the inner high-pressure forming die 10, in other words, in order to enable the bent pipe to be placed in the inner high-pressure forming die 10, the circumferential dimension of the cross section of the bent pipe is not greater than the corresponding circumferential dimension of the inner high-pressure forming die 10, and the corresponding circumferential dimension of the inner high-pressure forming die 10 means the circumferential dimension of the cavity of the inner high-pressure forming die 10 for accommodating the bent pipe.

It can be understood that, although the lengths of the cross-sectional lines of the adjacent cross-sections of the internal high-pressure forming member (i.e., the part formed by the internal high-pressure process) in the axial direction are substantially equal (approximately equal to the perimeter of the cross-section of the straight pipe blank), after the straight pipe blank is processed into a bent pipe, a sharp shape change from a high and narrow cross-sectional shape to a low and wide cross-sectional shape may occur, and for the high and narrow cross-sectional shape, when the diameter of the straight pipe blank is greater than the width of the cavity of the internal high-pressure forming mold 10, the bent pipe cannot be placed in the internal high-pressure forming mold 10, so that the pre-forming mold or tool of the pre-forming process is used to perform initial flattening on the part of the bent pipe; wherein, the section shape of the pre-forming mould is the section shape of the required bent pipe.

FIG. 9 is a schematic view of a pre-formed elbow configuration and cross-sections D-D, E-E, and F-F according to an embodiment of the present disclosure.

Referring to fig. 9, further, the preforming process includes: and placing the bent pipe in a pre-forming die for local flattening treatment. It will be appreciated that the preforming process is to flatten the bent pipe so that the bent pipe can be smoothly placed into the inner high-pressure forming mold 10 (i.e., the first mold 11 and the second mold 12).

The preforming process further includes: the bent pipes are sequentially processed into pipes to be formed with different set shapes by performing along the longitudinal extension direction of the beam member 20.

Step S130 further includes: respectively sealing two opposite ends of the bent pipe by using sealing punches; pressurizing and bulging the liquid in the elbow, simultaneously pushing the supplementary materials into the elbow by the two sealing punches respectively, and under the combined action of liquid pressurization and axial supplementary materials of the sealing punches, enabling the outer peripheral wall of the elbow to be attached to the inner peripheral wall of the inner high-pressure forming die 10; and increasing the liquid pressure to enable the transition zone fillet on the elbow to be attached to the inner peripheral wall of the inner high-pressure forming die 10, thereby obtaining the beam-like member 20 with the flanging structure 23.

Compared with the traditional internal high-pressure forming process, in the process of buckling the second die 12 of the internal high-pressure forming die 10, liquid is filled into the bent pipe from the two opposite ends of the bent pipe for bulging, so that the processed beam part 20 has a flanging structure 23 for connection.

Step S130 further includes: and punching a positioning hole on the bent pipe. The positioning hole is used for subsequent laser trimming and hole cutting procedures so as to facilitate positioning.

After step S130, the method for manufacturing the beam member 20 further includes: s140: finishing the flange structure 23. It can be understood that the finishing flange structure 23 is mainly used for further improving the dimensional accuracy of the flange structure 23 according to the use requirement of the flange structure 23.

In step S140, the burring structure 23 of the beam member 20 is partially finished by the press mold. It can be understood that, because the flanging structure 23 is formed by bulging and flattening the bent pipe, the flanging structure 23 includes two layers of pipe fittings, and the original thickness of each layer of pipe fitting is the pipe wall thickness of the bent pipe, so that the flanging structure 23 is subjected to finish machining to ensure that the flatness and the gap amount of the joint part of the two layers of pipe fittings at the flanging structure 23 meet the welding quality requirement of a workpiece.

After step S140, the method for manufacturing the beam member 20 further includes: and finishing the two end parts and the positioning holes of the beam part 20. It should be noted that the trimming and punching by laser cutting means to cut off the end scrap and the hole scrap of the inside high-pressure forming beam member 20.

FIG. 10 is a schematic view of a portion of a beam assembly according to an embodiment of the present application; FIG. 11 is a schematic cross-sectional view of H-H in FIG. 10.

After step S140, the method for manufacturing the beam member 20 further includes: end turn-up structures 23 are made.

It should be noted that, when the beam member 20 is of an integral structure, the end of the beam member 20 may be flanged by using a special flanging die or a flanging tool, so as to form the end flanging structure 23. When the beam member 20 is not an integral structure, the welding of the end portion of the beam member 20 to form the flange structure 23 (in this case, the stamping member 50 is the flange structure 23) cannot be completed in the internal high-pressure forming process, and the end portion of the beam member 20 is welded to the stamping member 50 to form the flange structure 23 (in this case, the stamping member 50 is the flange structure 23), or the flange structure 23 is formed at the end portion by directly flanging the trimmed internal high-pressure forming member with a flange die, where b in fig. 11 is a welding point between the end portion of the beam member 20 and the stamping member 50, and c is a welding line between the end portion of the beam member 20 and the stamping member 50.

Before S110, the method for manufacturing the beam member 20 further includes: and determining the position of the section to be reinforced, and welding pipe blanks with different materials or different material thicknesses from the straight pipe blank at the position of the section to be reinforced. That is, at the section position that needs to be strengthened, a straight pipe blank with higher material strength and larger pipe wall thickness can be adopted, and a plurality of sections of straight pipe blanks are connected together in a welding (for example, laser welding) mode.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (15)

1. The utility model provides an interior high-pressure forming die for the shaping pipe blank of waiting to process which characterized in that, interior high-pressure forming die includes:

the first die is provided with a first cavity, and one side of the first die is sunken into the first die along a first direction; the first cavity is provided with a starting end and a terminating end, the cavity wall of the first cavity is provided with a first limiting surface and a second limiting surface which extend along the second direction, the first limiting surface and the second limiting surface are arranged oppositely in the third direction, and the pipe blank part to be processed is positioned between the first limiting surface and the second limiting surface; the cavity wall of the first cavity is provided with a third limiting surface and a fourth limiting surface which extend along the second direction, and the third limiting surface and the fourth limiting surface are arranged oppositely in the third direction and are used for limiting the degree of freedom of the tube blank to be machined along the third direction; and

the second die is matched with the first cavity and matched with the first die so as to machine the tube blank to be machined into a preset shape;

wherein a direction in which the starting end points to the terminating end is the second direction, and the first direction, the second direction and the third direction intersect with each other; the first limiting surface and the second limiting surface are positioned between the third limiting surface and the fourth limiting surface.

2. The internal high pressure forming die according to claim 1, wherein the first die is provided with two receiving grooves at intervals along the third direction, the two receiving grooves longitudinally extend along the second direction, and a groove wall of one side of each of the two receiving grooves, which is far away from each other, is respectively overlapped with the third limiting surface and the fourth limiting surface;

one of them the holding tank is located respectively between first spacing face and the third spacing face, another the holding tank is located between the spacing face of second and the fourth spacing face.

3. The inner high-pressure forming die according to claim 1, wherein the pipe blank to be machined is provided with a preset contact part; the protruding conflict portion that is equipped with of second mould, conflict portion structure is when the second mould with when first mould cooperates, the conflict portion of second mould contacts first wait to process the preset contact site of pipe.

4. A method for manufacturing a beam member including a cross member and a side member in a cab of a vehicle, the method for manufacturing the beam member using the internal high pressure forming die according to any one of claims 1 to 3, the method comprising the steps of:

preparing a straight pipe blank made of a preset material and with a preset wall thickness;

manufacturing the straight pipe blank into a bent pipe with a preset shape;

manufacturing the bent pipe with the preset shape into a beam part with a flanging structure by an internal high-pressure forming process;

the method for manufacturing the beam part with the flanging structure by using the bent pipe with the preset shape through the internal high-pressure forming process specifically comprises the following steps:

and placing the bent pipe in the first die, filling liquid into the bent pipe from two opposite ends of the bent pipe along the second direction and pressurizing the liquid in the process of buckling the second die so as to expand the bent pipe, so that the bent pipe between the first limiting surface and the third limiting surface and the bent pipe between the second limiting surface and the fourth limiting surface respectively form a flanging structure.

5. The method for manufacturing a beam according to claim 4, wherein the step of manufacturing the straight pipe blank into the bent pipe with a preset shape is specifically as follows: and (3) manufacturing the straight pipe blank into a bent pipe with a preset shape through a pipe bending machine at normal temperature.

6. The method of fabricating a beam member according to claim 4, wherein after the step of forming the straight pipe blank into the bent pipe having a predetermined shape, the method further comprises:

judging whether the section line length of the bent pipe is larger than a preset section line length;

and performing preforming treatment on the bent pipe through a preforming procedure under the condition that the length of the section line of the bent pipe is greater than the preset section line length.

7. The method of making a beam according to claim 6, wherein said preforming step comprises: and placing the bent pipe in a pre-forming die for local flattening treatment.

8. The method of making a beam according to claim 6, wherein said preforming step further comprises: and sequentially processing the bent pipes into pipes to be formed with different set shapes by performing along the longitudinal extension direction of the beam parts.

9. The method for manufacturing a beam according to claim 4, wherein the step of manufacturing the bent pipe with the preset shape into the beam with the flanging structure by the internal high-pressure forming process further comprises the following steps:

sealing the opposite ends of the bent pipe respectively by using sealing punches;

pressurizing and bulging the liquid in the bent pipe, and simultaneously pushing the supplementary materials into the bent pipe by the two sealing punches respectively until the outer peripheral wall of the bent pipe is attached to the inner peripheral wall of the inner high-pressure forming die;

and increasing the pressure of the liquid to enable the transition area fillet on the elbow to be attached to the inner peripheral wall of the inner high-pressure forming die, so that the beam part with the flanging structure is obtained.

10. The method for manufacturing a beam according to claim 4, wherein the step of manufacturing the bent pipe with the preset shape into the beam with the flanging structure by the internal high-pressure forming process further comprises the following steps: punching a positioning hole on the bent pipe.

11. The method of manufacturing a beam according to claim 10, wherein after the bent pipe of a predetermined shape is manufactured into a beam having a burring structure through an internal high pressure forming process, the method further comprises: and finishing the flanging structure.

12. The method for manufacturing a beam member according to claim 11, wherein the finish machining of the flange structure specifically comprises: and carrying out local finish machining on the flanging structure of the beam part through a stamping die.

13. A method of making a beam according to claim 11 wherein the beam is provided with ends at opposite ends along its longitudinal extent; after the finishing of the flanging structure, the manufacturing method of the beam part further comprises the following steps: and finishing the two end parts and the positioning holes of the beam part.

14. The method of making a beam according to claim 11, wherein after said finishing of said flange structure, said method further comprises: and manufacturing an end flanging structure of the end part.

15. The method for making a beam according to claim 4, wherein before said preparing a straight pipe blank of a predetermined material and a predetermined wall thickness, said method further comprises: and determining the position of the section to be reinforced, and welding pipe blanks with different materials or different material thicknesses from the straight pipe blank at the position of the section to be reinforced.

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