Automobile front door ring and manufacturing method thereof and automobile

Abstract

The present invention discloses a front door ring for an automobile, comprising: an automobile A-pillar including an upper section of an A-pillar and a lower section of an A-pillar, wherein the upper section of the A-pillar has a first soft zone for welding with a roof cross beam; an automobile B-pillar including an upper section of a B-pillar and a lower section of a B-pillar; a front door sill whose front and rear ends are respectively fixed to the rear side of the lower part of the lower section of the A-pillar and the front side of the lower part of the B-pillar; a rear door sill fixed to the rear side of the lower section of the B-pillar; the upper section of the A-pillar except the first soft zone, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are all hard zones, and the lower section of the B-pillar is a second soft zone. The present invention also discloses a manufacturing method of the above automobile front door ring and an automobile including the above automobile front door ring. The automobile front door ring, the manufacturing method thereof and the automobile provided by the present invention have the advantages that the automobile A-pillar and the roof cross beam are not prone to cracking, the front door ring has good buffering performance, can shrink and absorb energy when impact occurs, and can control the deformation of the front door ring, which is beneficial to protecting the heads of drivers and passengers, and has good safety.

Description

Technical Field

[0001] The invention relates to the field of automobile manufacturing, in particular to an automobile front door ring and a manufacturing method thereof and an automobile. Background Art

[0002] The front door ring of a car is an important structural part of the car body frame. The front door ring of a car is formed by connecting the A-pillar, the B-pillar and the front door sill in sequence. In current car manufacturing, in order to improve the strength of the car body, the A-pillar, the B-pillar and the front door sill are all made of ultra-high-strength hard plates. The existing front door rings of cars mainly have the following problems:

[0003] 1. When a car collides, it is very easy to roll over due to the overall strength of the car body and poor buffering;

[0004] 2. Since the front door rings of cars are all made of hard plates, they will deform and break uncontrollably when hit. If the upper part of the front door ring is severely deformed or broken, it will cause fatal injuries to the heads of the drivers and passengers, and the safety of the car will be poor.

[0005] 3. The two ends of the roof beam are welded to the A-pillars on the left and right sides of the vehicle body respectively. The A-pillars and the roof beams are directly welded through hard plates, and the welding point area is prone to form a low-strength area. In the event of a collision, the welding point area of ​​the A-pillars and the roof beams is prone to cracking. The broken A-pillars and roof beams are likely to cause fatal injuries to the driver and passengers, and the safety is poor;

[0006] 4. The existing automobile front door ring is a single product produced by welding and assembling parts such as automobile A-pillar, automobile B-pillar and front door sill. Separately manufacturing each part requires different molds and processes, which is costly and complicated. Summary of the invention

[0007] The present invention aims to provide a front door ring of an automobile, a manufacturing method thereof and an automobile. The A-pillar and the roof beam of the automobile are not prone to cracking, the front door ring has good buffering performance, can shrink and absorb energy when a collision occurs, and can control the deformation area of ​​the front door ring, which is beneficial to protecting the heads of drivers and passengers, has good safety, simple process and low cost.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] The automobile front door ring disclosed in the present invention comprises:

[0010] An automobile A-pillar comprising an A-pillar upper section and an A-pillar lower section, wherein the lower end of the A-pillar upper section is fixed to the A-pillar lower section, and the A-pillar upper section has a first soft zone for welding to a roof crossbar;

[0011] A car B-pillar comprising an upper B-pillar section and a lower B-pillar section, wherein the upper end of the upper B-pillar section is fixed to the upper A-pillar section, and the lower end of the upper B-pillar section is fixed to the upper end of the lower B-pillar section;

[0012] A front door sill having front and rear ends respectively fixed to the rear side of the lower portion of the A-pillar lower section and the front side of the lower portion of the B-pillar lower section;

[0013] a rear door sill fixed to the rear side of the lower portion of the lower section of the B-pillar;

[0014] The upper section of the A-pillar excluding the first soft area, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are all hard areas, and the lower section of the B-pillar is the second soft area.

[0015] The beneficial effects of the present invention are as follows: the upper section of the A-pillar is welded to the roof crossbeam through the first soft zone, which improves the toughness of the welding point area and reduces the stress concentration at the welding point. When a collision occurs, the first soft zone absorbs energy, and the upper section of the A-pillar and the roof crossbeam are not easy to crack, thereby avoiding the broken automobile A-pillar and roof crossbeam from causing harm to the driver and passengers; the safety is good; the lower section of the B-pillar is the second soft zone, which can shrink and absorb energy when a collision occurs, reduce instantaneous impact, reduce harm to the driver and passengers, and at the same time avoid rollover accidents caused by excessive instantaneous impact energy when the overall strength is too high; and the lower section of the B-pillar shrinks After shrinking and absorbing energy, the front door sill and the lower section of the A-pillar connected to the front door sill deform toward the lower section of the B-pillar. The first soft zone on the upper section of the A-pillar is conducive to the flexible swing of the A-pillar of the car, which can ensure the upper space of the front door ring as much as possible to avoid deformation or damage to the upper part of the front door ring, which may cause fatal injury to the driver's head; the front door ring has good cushioning performance and can shrink to absorb energy when a collision occurs, and can control the deformation of the front door ring, which is beneficial to protecting the driver's head; the upper section of the A-pillar excluding the first soft zone, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are all hard areas, which can ensure the strength of the vehicle body and have a high overall safety factor.

[0016] Furthermore, the A-pillar upper section, the A-pillar lower section, the B-pillar upper section, the B-pillar lower section, the front door sill and the rear door sill are integrally formed by stamping.

[0017] The beneficial effect of adopting the above further scheme is: in the prior art, each component such as the A-pillar upper section, the A-pillar lower section, the B-pillar upper section, the B-pillar lower section, the front door sill and the rear door sill needs to be manufactured separately, and each component is spliced ​​after being manufactured. The manufacture of each component corresponds to different molds and processes, and multiple stampings are required, which is costly and complicated. The A-pillar upper section, the A-pillar lower section, the B-pillar upper section, the B-pillar lower section, the front door sill and the rear door sill are formed in one piece by stamping, which can reduce the number of stamping times and only requires one set of molds, which is more economical, and the parts of the front door ring formed in one piece by stamping are more firmly fixed, which can reduce the possibility of cracking.

[0018] Furthermore, the automobile A-pillar also includes a first reinforcing patch plate and a second reinforcing patch plate, the first reinforcing patch plate is integrally formed with the upper section of the A-pillar by stamping a local reinforcement area of ​​the upper section of the A-pillar, the second reinforcing patch plate is integrally formed with the lower section of the A-pillar by stamping a local reinforcement area of ​​the lower section of the A-pillar, and the automobile B-pillar also includes a third reinforcing patch plate, the third reinforcing patch plate is integrally formed with the upper section of the B-pillar by stamping a local reinforcement area of ​​the upper section of the B-pillar.

[0019] The beneficial effect of adopting the above further scheme is that: since certain parts on the A-pillar and the B-pillar of the automobile need to be locally reinforced, in the existing automobile manufacturing, a method of welding cold stamping reinforcements and other parts at the positions where local reinforcement is required is often adopted. The A-pillar and the B-pillar of the automobile welded with cold stamping reinforcements are heavy, and the connection areas of the welded cold stamping reinforcements and other parts are prone to cracking in the event of a collision. The broken cold stamping reinforcements are prone to cause harm to the driver and passengers, and the manufacture of cold stamping reinforcements requires the manufacture of molds, fixtures and other tooling, which has high production costs and low production efficiency. By respectively welding the upper section of the A-pillar, the lower section of the A-pillar and the upper section of the B-pillar The first, second and third reinforcing patch plates are provided to enhance the local strength of the A-pillar and the upper section of the B-pillar of the automobile, so as to meet the different strength requirements of the automobile body for each area. The A-pillar and the upper section of the B-pillar of the automobile have high strength, and there is no need to weld other cold-stamped reinforcement parts. Only the local reinforced area has the first, second or third reinforcing patch plate, which is light in weight and does not require the design and production of other tooling. It is formed in one piece by stamping, is not easy to crack, and has a high safety factor. The first, second and third reinforcing patch plates can be made of scraps from other parts of the front door ring, and the utilization rate of raw materials is high.

[0020] Furthermore, the lower section of the B-pillar is in an inverted "T" shape, the protruding end on the front side of the lower portion of the B-pillar is fixed to the front door sill, and the protruding end on the rear side of the lower portion of the B-pillar is used to be fixed to the rear door sill.

[0021] The beneficial effects of adopting the above further solution are: it is easy to connect and fix the lower section of the B-pillar with the front and rear door sills, the buffer energy absorption area is long, the energy absorption effect is good, and the impact of the front door sill on the rear door sill in the event of a collision can be reduced.

[0022] Furthermore, the angle between the horizontal and vertical sections of the lower section of the B-pillar is a curved transition.

[0023] The beneficial effect of adopting the above further solution is that when it is hit, it slowly deforms along the arc surface, which can improve the buffering performance, and at the same time reduce the deformation amount and improve safety.

[0024] Furthermore, the first soft zone is formed by laser tempering and softening a region of the upper section of the A-pillar used for welding to the roof crossbeam.

[0025] The beneficial effect of adopting the above further scheme is: directly laser tempering and softening the upper section of the A-pillar to form the first soft zone, which is convenient for production, does not require additional parts, does not require intermediate welding materials, is conducive to weight reduction, and reduces the number of welding times.

[0026] Furthermore, the yield strength of the upper section of the A-pillar excluding the first soft zone, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill is 950-1300MPa, the tensile strength is 1300-1650MPa, the tensile test A80 is ≥4.5%, and the hardness is 400-520HV; the yield strength of the lower section of the B-pillar is 400-550MPa, the tensile strength is 600-800MPa, the tensile test A80 is ≥10%, and the hardness is 160-235HV; the yield strength of the first soft zone is 600-750MPa, the tensile strength is 800-950MPa, the tensile test A80 is ≥6%, and the hardness is 160-300HV.

[0027] The beneficial effects of adopting the above further scheme are: the upper section of the A-pillar excluding the first soft zone, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are high in strength and can provide sufficient stability; the lower section of the B-pillar has greater toughness, which is conducive to shrinking energy absorption and controlling the deformation of the front door ring when it is hit; the first soft zone takes into account both strength and toughness, which is conducive to preventing cracking in the welding point area, allowing the A-pillar of the car to swing, and is conducive to maintaining the upper space of the front door ring.

[0028] Furthermore, the thickness of the lower section of the A-pillar is smaller than the thickness of the upper section of the A-pillar, the thickness of the front door sill is smaller than the thickness of the upper section of the B-pillar, and the upper section of the B-pillar and the lower section of the B-pillar have the same thickness.

[0029] The beneficial effect of adopting the above further solution is that the thickness at each position is different, which meets the strength requirements of different positions of the vehicle body and is beneficial to reducing the weight of the vehicle body while ensuring the strength.

[0030] The automobile disclosed by the invention comprises the above-mentioned automobile front door ring.

[0031] The beneficial effects of the present invention are as follows: the upper section of the A-pillar is welded to the roof crossbeam through the first soft zone, which improves the toughness of the welding point area and reduces the stress concentration at the welding point. When a collision occurs, the first soft zone absorbs energy, and the upper section of the A-pillar and the roof crossbeam are not easy to crack, thereby avoiding the broken automobile A-pillar and roof crossbeam from causing harm to the driver and passengers; the safety is good; the lower section of the B-pillar is the second soft zone, which can shrink and absorb energy when a collision occurs, reduce instantaneous impact, reduce harm to the driver and passengers, and at the same time avoid rollover accidents caused by excessive instantaneous impact energy when the overall strength is too high; and the lower section of the B-pillar shrinks After shrinking and absorbing energy, the front door sill and the lower section of the A-pillar connected to the front door sill deform toward the lower section of the B-pillar. The first soft zone on the upper section of the A-pillar is conducive to the flexible swing of the A-pillar of the car, which can ensure the upper space of the front door ring as much as possible to avoid deformation or damage to the upper part of the front door ring, which may cause fatal injury to the driver's head; the front door ring has good cushioning performance and can shrink to absorb energy when a collision occurs, and can control the deformation of the front door ring, which is beneficial to protecting the driver's head; the upper section of the A-pillar excluding the first soft zone, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are all hard areas, which can ensure the strength of the vehicle body and have a high overall safety factor.

[0032] The manufacturing method of the automobile front door ring disclosed in the present invention comprises the following steps:

[0033] The plates for manufacturing the upper section of the B-pillar, the lower section of the B-pillar, the front door sill, the rear door sill, the lower section of the A-pillar and the upper section of the A-pillar are fixedly connected to form a front door ring blank, wherein the plates for manufacturing the upper section of the B-pillar, the front door sill, the rear door sill, the lower section of the A-pillar and the upper section of the A-pillar are hard zone materials, and the plates for manufacturing the lower section of the B-pillar are the second soft zone material;

[0034] Punching the front door ring blank to integrally form the B-pillar upper section, the B-pillar lower section, the front door sill, the rear door sill, the A-pillar lower section and the A-pillar upper section;

[0035] After stamping is completed, the area of ​​the upper section of the A-pillar used for welding with the roof crossbeam is softened to form a first soft area.

[0036] The beneficial effects of the present invention are as follows: the upper section of the A-pillar is welded to the roof crossbeam through the first soft zone, which improves the toughness of the welding point area and reduces the stress concentration at the welding point. During a collision, the first soft zone absorbs energy, and the upper section of the A-pillar and the roof crossbeam are not easy to crack, thereby avoiding the broken automobile A-pillar and roof crossbeam from causing harm to the driver and passengers; the safety is good; the lower section of the B-pillar is made of the second soft zone material, and when a collision occurs, it can shrink and absorb energy, reduce instantaneous impact, and reduce harm to the driver and passengers, and at the same time avoid rollover accidents caused by excessive instantaneous impact energy when the overall strength is too high; and after the lower section of the B-pillar shrinks and absorbs energy, the front door sill and the lower section of the A-pillar connected to the front door sill deform toward the lower section of the B-pillar, and the first soft zone of the upper section of the A-pillar is conducive to the flexible swing of the automobile A-pillar, which can ensure the upper space of the front door ring as much as possible, avoiding Deformation or damage of the upper part of the front door ring may cause fatal injury to the head of the driver and occupants; the front door ring has good buffering performance, can shrink and absorb energy when a collision occurs, and can control the deformation of the front door ring, which is beneficial to protecting the head of the driver and occupants; the upper section of the A-pillar excluding the first soft area, the lower section of the A-pillar, the upper section of the B-pillar, the front door sill and the rear door sill are all hard areas, which can ensure the strength of the vehicle body and have a high overall safety factor; after the plates of the upper section of the A-pillar, the lower section of the A-pillar, the upper section of the B-pillar, the lower section of the B-pillar and the front door sill are fixed to form the front door ring blank, the front door ring formed by the upper section of the A-pillar, the lower section of the A-pillar, the upper section of the B-pillar, the lower section of the B-pillar, the front door sill and the rear door sill are formed in one piece through one stamping, which can reduce the number of stamping times and only requires one set of molds, which is more economical, and the various parts of the front door ring formed in one piece by one stamping are fixed more firmly, which can reduce the possibility of cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a front door ring of an automobile provided by the present invention;

[0038] Figure 2 Schematic diagram of the connection between the roof beam and the left and right A-pillars of the car

[0039] In the figure: 1, car A-pillar; 11, upper section of A-pillar; 12, lower section of A-pillar; 2, roof crossbar; 31, first reinforcement patch plate; 32, second reinforcement patch plate; 33, third reinforcement patch plate; 4, front door sill; 5, car B-pillar; 51, upper section of B-pillar; 52, lower section of B-pillar; 6, rear door sill; 7, first soft zone; DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0041] like Figure 1 , Figure 2 As shown, the embodiment of the automobile front door ring disclosed by the present invention includes:

[0042] include,

[0043] An automobile A-pillar 1 comprises an A-pillar upper section 11 and an A-pillar lower section 12, wherein the lower end of the A-pillar upper section 11 is fixed to the A-pillar lower section 12, and the A-pillar upper section 11 has a first soft area 7 for welding to a roof crossbar 2;

[0044] The automobile B-pillar 5 comprises a B-pillar upper section 51 and a B-pillar lower section 52, wherein the upper end of the B-pillar upper section 51 is fixed to the A-pillar upper section 11, and the lower end of the B-pillar upper section 51 is fixed to the upper end of the B-pillar lower section 52;

[0045] A front door sill 4 having front and rear ends respectively fixed to the rear side of the lower portion of the A-pillar lower section 12 and the front side of the lower portion of the B-pillar lower section 52;

[0046] A rear door sill 6 fixed to the rear side of the lower portion of the B-pillar lower section 52;

[0047] The A-pillar upper section 11 excluding the first soft zone 7 , the A-pillar lower section 12 , the B-pillar upper section 51 , the front door sill 4 and the rear door sill 6 are all hard zones, and the B-pillar lower section 52 is the second soft zone.

[0048] The A-pillar lower section 12 , the A-pillar upper section 11 , the B-pillar upper section 51 , the B-pillar lower section 52 , the front door sill 4 and the rear door sill 6 are connected to form a front door ring.

[0049] As a further solution of the above embodiment, the A-pillar upper section 11 , the A-pillar lower section 12 , the B-pillar upper section 51 , the B-pillar lower section 52 , the front door sill 4 and the rear door sill 6 are integrally formed by stamping.

[0050] As a further solution of the above embodiment, the automobile A-pillar 1 further includes a first reinforcement patch plate 31 and a second reinforcement patch plate 32, the first reinforcement patch plate 31 is formed integrally with the A-pillar upper section 11 by stamping on the local reinforcement area of ​​the A-pillar upper section 11, the second reinforcement patch plate 32 is formed integrally with the A-pillar lower section 12 by stamping on the local reinforcement area of ​​the A-pillar lower section 12, and the automobile B-pillar 5 further includes a third reinforcement patch plate 33, the third reinforcement patch plate 33 is formed integrally with the B-pillar upper section 51 by stamping on the local reinforcement area of ​​the B-pillar upper section 51. The shape of the automobile A-pillar 1 can be the same as the shape of the upper half of the bow.

[0051] The first reinforcement patch plate 31, the second reinforcement patch plate 32 and the third reinforcement patch plate 33 are spot welded at corresponding positions before the A-pillar upper section 11, the A-pillar lower section 12, the B-pillar upper section 51, the B-pillar lower section 52, the front door 4 and the rear door 6 are integrally formed by stamping, and then the first reinforcement patch plate 31, the second reinforcement patch plate 32 and the third reinforcement patch plate 33 are stamped together with the A-pillar upper section 11, the A-pillar lower section 12, the B-pillar upper section 51, the B-pillar lower section 52, the front door 4 and the rear door 6. It is easy to produce, can ensure sufficient strength in the area that needs to be strengthened, and is light in weight, which is conducive to reducing the weight of the vehicle body.

[0052] The local reinforcement areas of the A-pillar upper section 11 , the A-pillar lower section 12 and the B-pillar upper section 51 are their own middle sections.

[0053] As a further solution of the above embodiment, the B-pillar lower section 52 is in an inverted "T" shape, the protruding end on the front side of the lower portion of the B-pillar lower section 52 is fixed to the front door sill 4, and the protruding end on the rear side of the lower portion of the B-pillar lower section 52 is used to be fixed to the rear door sill 6.

[0054] As a further solution to the above embodiment, the angle between the horizontal and vertical sections of the B-pillar lower section 52 is an arc transition. When subjected to an impact, the lower portion of the inverted "T"-shaped B-pillar lower section 52 connected to the front door sill 4 and the rear door sill 6 has a long buffer distance and good buffering and energy absorption effects. The inverted "T"-shaped B-pillar lower section 52 deforms slowly along the arc surface, which can improve the buffering performance and reduce the deformation of the lower portion of the front door ring, thereby having good safety performance.

[0055] As a further solution of the above embodiment, the first soft zone 7 is formed by laser tempering and softening the area of ​​the A-pillar upper section 11 used for welding with the roof cross beam 2. Specifically, the surface of the A-pillar upper section 11 used for welding with the roof cross beam 2 is softened by laser tempering to form the first soft zone 7, and the A-pillar upper section 11 and the two ends of the roof cross beam 2 are welded through the first soft zones 7 on both sides of the vehicle body, which is convenient for production, does not require additional components, does not require intermediate welding materials, is conducive to weight reduction, and reduces the number of welding times.

[0056] Specifically, the yield strength of the A-pillar upper section 11 excluding the first soft zone 7, the A-pillar lower section 12, the B-pillar upper section 51, the front door sill 4 and the rear door sill 6 can all be any value within the range of 950 to 1300 MPa, the tensile strength can be any value within the range of 1300 to 1650 MPa, the tensile test A80 is ≥4.5%, and the hardness can be any value within the range of 400 to 520 HV; the yield strength of the B-pillar lower section 52 is any value within the range of 400 to 550 MPa, the tensile strength is any value within the range of 600 to 800 MPa, the tensile test A80 is ≥10%, and the hardness is any value within the range of 160 to 235 HV; the yield strength of the first soft zone 7 is any value within the range of 600 to 750 MPa, the tensile strength is any value within the range of 800 to 950 MPa, the tensile test A80 is ≥6%, and the hardness is any value within the range of 160 to 300 HV.

[0057] The upper section of the A-pillar 11 excluding the first soft zone 7, the lower section of the A-pillar 12, the upper section of the B-pillar 51, the front door sill 4, the rear door sill 6, the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 can be made of the same material with the same performance, and Usibor1500 material can be selected. The first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 have a small material area and can be made of scraps, which is beneficial to improving the utilization rate of raw materials.

[0058] The thickness of the lower section 12 of the A-pillar is less than that of the upper section 11 of the A-pillar, the thickness of the front door sill 4 is less than that of the upper section 51 of the B-pillar, and the upper section 51 of the B-pillar and the lower section 52 of the B-pillar are of the same thickness. The first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 can have the same thickness, which can be any value between 0.6 and 1.2 mm as required. The thickness of the upper section 11 of the A-pillar can be any value between 0.8 and 1.6 mm; the thickness of the front door sill 4 can be any value between 1.0 and 1.8 mm; the thickness of the upper section 51 of the B-pillar, the lower section 52 of the B-pillar and the rear door sill 6 can be any value between 1.2 and 2.0 mm.

[0059] In one embodiment, the thickness of the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 is 0.8 mm, the thickness of the upper section of the A-pillar 11 can be 1.2 mm; the thickness of the front door sill 4 can be 1.4 mm; the thickness of the upper section of the B-pillar 51, the lower section of the B-pillar 52 and the rear door sill 6 can be 1.6 mm.

[0060] The B-pillar lower section 52 can be made of Ductibor450 or Ductibor500 material.

[0061] The embodiment of the automobile disclosed in the present invention comprises the above-mentioned automobile front door ring. The above-mentioned automobile front door ring is used on both sides of the vehicle body, and the two ends of the roof crossbeam 2 are respectively welded to the first soft areas 7 on the left and right sides of the vehicle body. The protruding end of the rear side of the lower section 52 of the B-pillar of the above-mentioned automobile front door ring is welded to the corresponding rear door sill 6.

[0062] An embodiment of the method for manufacturing a front door ring of an automobile disclosed in the present invention comprises the steps of:

[0063] The plates for manufacturing the B-pillar upper section 51, the B-pillar lower section 52, the front door sill 4, the rear door sill 6, the A-pillar lower section 12 and the A-pillar upper section 11 are fixedly connected to form a front door ring blank, wherein the plates for manufacturing the B-pillar upper section 51, the front door sill 4, the rear door sill 6, the A-pillar lower section 12 and the A-pillar upper section 11 are hard zone materials, and the plates for manufacturing the B-pillar lower section 52 are the second soft zone material;

[0064] The front door ring blank is stamped to form the B-pillar upper section 51, the B-pillar lower section 52, the front door sill 4, the rear door sill 6, the A-pillar lower section 12 and the A-pillar upper section 11 in one piece;

[0065] After stamping is completed, the area of ​​the A-pillar upper section 11 used for welding with the roof cross beam 2 is softened to form a first soft area 7 .

[0066] The properties of the hard zone material are: yield strength of 950-1300MPa, tensile strength of 1300-1650MPa, tensile test A80 ≥ 4.5%, hardness of 400-520HV, and Usibor1500 material can be selected;

[0067] The properties of the second soft zone material are: yield strength of 400-550 MPa, tensile strength of 600-800 MPa, tensile test A80≥10%, hardness of 160-235 HV, and Ductibor450 or Ductibor500 material can be selected.

[0068] As a further solution to the above embodiment, the plates used to manufacture the B-pillar upper section 51, the B-pillar lower section 52, the front door sill 4, the rear door sill 6, the A-pillar lower section 12 and the A-pillar upper section 11 are fixedly connected by spot welding to form a front door ring blank. The plates are stamped after being spot welded, and the possibility of cracking is almost zero.

[0069] As a further solution of the above embodiment, after the plates made of the B-pillar upper section 51, the B-pillar lower section 52, the front door sill 4, the rear door sill 6, the A-pillar lower section 12 and the A-pillar upper section 11 are fixedly connected to form a front door ring blank, before stamping, the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 are laser spot welded correspondingly to the local reinforcement areas of the A-pillar upper section 11, the A-pillar lower section 12 and the B-pillar upper section 51 respectively. After the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 are welded, they are stamped together with the front door ring blank at one time to form an integral front door ring with the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33.

[0070] Before stamping, the front door blank formed by welding the plates for manufacturing the upper section 51 of the B-pillar, the lower section 52 of the B-pillar, the front door sill 4, the rear door sill 6, the lower section 12 of the A-pillar and the upper section 11 of the A-pillar, and the first reinforcing patch plate 31, the second reinforcing patch plate 32 and the third reinforcing patch plate 33 welded thereon are heated to 930° C. and then placed in a stamping die for one-time stamping.

[0071] After stamping, the surface of the A-pillar upper section 11 for welding with the roof cross beam 2 is softened by laser tempering to form a first soft zone 7, and the edge of the first soft zone 7 on the A-pillar upper section 11 is a transition zone.

[0072] According to different thickness requirements for the B-pillar upper section 51, B-pillar lower section 52, front door sill 4, rear door sill 6, A-pillar lower section 12 and A-pillar upper section 11, plates of different thicknesses are selected at various positions to form the front door ring blank. Through the process of welding and stamping of different material thicknesses, the front door ring can be formed in one stamping and one set of molds, saving costs and processes.

[0073] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, and can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0074] In the description of the invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the invention.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A car front door ring, characterized in that: include, An automobile A-pillar (1) comprising an A-pillar upper section (11) and an A-pillar lower section (12), wherein the lower end of the A-pillar upper section (11) is fixed to the A-pillar lower section (12), and the A-pillar upper section (11) has a first soft zone (7) for welding to a roof cross beam (2); A vehicle B-pillar (5) comprising a B-pillar upper section (51) and a B-pillar lower section (52), wherein the upper end of the B-pillar upper section (51) is fixed to the A-pillar upper section (11), and the lower end of the B-pillar upper section (51) is fixed to the upper end of the B-pillar lower section (52); A front door sill (4) having front and rear ends respectively fixed to the rear side of the lower portion of the A-pillar lower section (12) and the front side of the lower portion of the B-pillar lower section (52); a rear door sill (6) fixed to the rear side of the lower portion of the B-pillar lower section (52); The A-pillar upper section (11) excluding the first soft zone (7), the A-pillar lower section (12), the B-pillar upper section (51), the front door sill (4) and the rear door sill (6) are all hard zones, and the B-pillar lower section (52) is a second soft zone; The A-pillar upper section (11), the A-pillar lower section (12), the B-pillar upper section (51), the B-pillar lower section (52), the front door sill (4) and the rear door sill (6) are integrally formed by stamping; The automobile A-pillar (1) further comprises a first reinforcement patch plate (31) and a second reinforcement patch plate (32), wherein the first reinforcement patch plate (31) is integrally formed with the A-pillar upper section (11) by stamping at a local reinforcement area of ​​the A-pillar upper section (11), and the second reinforcement patch plate (32) is integrally formed with the A-pillar lower section (12) by stamping at a local reinforcement area of ​​the A-pillar lower section (12), and the automobile B-pillar (5) further comprises a third reinforcement patch plate (33), wherein the third reinforcement patch plate (33) is integrally formed with the B-pillar upper section (51) by stamping at a local reinforcement area of ​​the B-pillar upper section (51); The yield strength of the A-pillar upper section (11) excluding the first soft zone (7), the A-pillar lower section (12), the B-pillar upper section (51), the front door sill (4) and the rear door sill (6) is 950-1300 MPa, the tensile strength is 1300-1650 MPa, the A80 in the tensile test is ≥4.5%, and the hardness is 400-520 HV; the yield strength of the B-pillar lower section (52) is 400-550 MPa, the tensile strength is 600-800 MPa, the A80 in the tensile test is ≥10%, and the hardness is 160-235 HV; the yield strength of the first soft zone (7) is 600-750 MPa, the tensile strength is 800-950 MPa, the A80 in the tensile test is ≥6%, and the hardness is 160-300 HV.

2. The automobile front door ring according to claim 1, characterized in that: The B-pillar lower section (52) is in an inverted "T" shape, the protruding end on the front side of the lower portion of the B-pillar lower section (52) is fixed to the front door sill (4), and the protruding end on the rear side of the lower portion of the B-pillar lower section (52) is used to be fixed to the rear door sill (6).

3. The automobile front door ring according to claim 2, characterized in that: The angle between the horizontal and vertical sections of the B-pillar lower section (52) is an arc transition.

4. The automobile front door ring according to any one of claims 1 to 3, characterized in that: The thickness of the A-pillar lower section (12) is smaller than the thickness of the A-pillar upper section (11), the thickness of the front door sill (4) is smaller than the thickness of the B-pillar upper section (51), and the B-pillar upper section (51) and the B-pillar lower section (52) have the same thickness.

5. A car, characterized in that: The invention comprises a car front door ring as claimed in any one of claims 1 to 4.

6. A method for manufacturing a front door ring of an automobile, characterized in that: The front door ring comprises the automobile front door ring according to any one of claims 1 to 4, comprising the steps of: The plates used to manufacture the upper section of the B-pillar (51), the lower section of the B-pillar (52), the front door sill (4), the rear door sill (6), the lower section of the A-pillar (12) and the upper section of the A-pillar (11) are fixedly connected to form a front door ring blank, wherein the plates used to manufacture the upper section of the B-pillar (51), the front door sill (4), the rear door sill (6), the lower section of the A-pillar (12) and the upper section of the A-pillar (11) are hard zone materials, and the plates used to manufacture the lower section of the B-pillar (52) are second soft zone materials; Punching the front door ring blank so that the B-pillar upper section (51), the B-pillar lower section (52), the front door sill (4), the rear door sill (6), the A-pillar lower section (12) and the A-pillar upper section (11) are integrally formed; After the stamping is completed, the area of ​​the A-pillar upper section (11) used for welding with the roof crossbeam (2) is softened to form a first soft area (7); The first soft zone (7) is formed by laser tempering and softening the area of ​​the A-pillar upper section (11) used for welding with the roof crossbeam (2).

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