阅读说明：本技术 一种铝制机罩内板的成型模具及成型方法 (Forming die and forming method for aluminum hood inner plate ) 是由 黄思维 廖世林 邹平 何斌 宁兵 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种铝制机罩内板的成型模具及成型方法,包括上下布置的凹模、凸模和位于所述凹模与所述凸模之间的压料圈,还包括设置于所述凹模内的压料板,所述压料板与所述凹模之间连接有弹性复位结构,所述压料圈可整体插入所述凸模内,所述凹模与所述压料圈之间距离小于所述压料板与所述压料圈之间距离。本发明所设计的机罩内板零件采用开口拉延加工方式,相比闭口拉延,板料的整体材料利用率提升了5％左右,有效的降低了机罩内板的制造成本。开口拉延区域对材料的成型性要求相对较低,机罩内板风窗转角区域无压料筋设置,相对降低了此区域板料的减薄率,提升了成型裕度测试的可行性,降低了零件的开裂风险。(The invention discloses a forming die and a forming method for an aluminum hood inner plate, and the forming die and the forming method comprise a female die, a male die and a material pressing ring positioned between the female die and the male die which are arranged up and down, and the material pressing plate arranged in the female die, wherein an elastic reset structure is connected between the material pressing plate and the female die, the material pressing ring can be integrally inserted into the male die, and the distance between the female die and the material pressing ring is smaller than the distance between the material pressing plate and the material pressing ring. Compared with closed drawing, the hood inner plate part designed by the invention adopts an open drawing processing mode, the overall material utilization rate of the plate is improved by about 5%, and the manufacturing cost of the hood inner plate is effectively reduced. The requirement of the opening drawing area on the formability of the material is relatively low, and no material pressing rib is arranged in the corner area of the air window of the hood inner plate, so that the reduction rate of the plate material in the area is relatively reduced, the feasibility of forming margin test is improved, and the cracking risk of parts is reduced.)

1. The utility model provides a forming die of aluminium system aircraft bonnet inner panel, includes die (1), terrace die (2) and the position of arranging from top to bottom die (1) with press material ring (3) between terrace die (2), its characterized in that: it still including set up in press flitch (4) in die (1), press flitch (4) with be connected with elasticity reset structure between die (1), press material ring (3) can wholly insert in terrace die (2), die (1) with press the distance between material ring (3) to be less than press flitch (4) with press the distance between material ring (3).

2. The forming die for an aluminum hood inner panel according to claim 1, wherein: the punch die is characterized in that the punch die (2) comprises an annular punch die holder (2.1) and a punch die body (2.2) located in the middle of the punch die holder (2.1), the material pressing ring (3) is an annular material pressing ring matched with the punch die holder (2.1), and a plurality of inserting rods (5) which are arranged downwards and can be inserted into gaps between the punch die holder (2.1) and the punch die body (2.2) are arranged on the bottom surface of the material pressing ring (3) at intervals along the circumferential direction of the material pressing ring.

3. The forming die for an aluminum hood inner panel according to claim 2, wherein: the die (1) comprises an annular die holder (1.1) corresponding to the pressing ring (3) and a die body (1.2) arranged in the middle of the die holder (1.1), and the pressing plate (4) is arranged along the length direction of the die holder (1.1) and a long straight plate arranged inside one side of the die holder (1.1).

4. The forming die for an aluminum hood inner panel according to claim 3, wherein: the elastic reset structure comprises a nitrogen spring (6) connected between the pressure plate (4) and the die holder (1.1).

5. The forming die for the inner panel of the aluminum hood as set forth in claim 4, wherein: and a damping limiter (7) is also connected between the pressure plate (4) and the die holder (1.1).

6. A forming method of an aluminum hood inner plate is characterized in that: the forming die comprises the forming die for the inner plate of the aluminum hood as claimed in any one of claims 1 to 5, wherein a plate (8) is placed on the material pressing ring (3), the female die (1) moves downwards, the female die (1) is matched with the material pressing ring (3), the female die (1) and the material pressing ring (3) move downwards synchronously, a drawing rib of the plate is processed in the region of the material pressing ring, the material pressing plate (4) is matched with the male die (2), the female die (1) and the material pressing ring (3) continue to move downwards synchronously, the drawing rib of the plate (3) in the region of the material pressing plate is processed, the female die (1) and the material pressing ring (3) move downwards again to a position where the die and the male die (2) are completely matched, part forming is completed, the female die (1) moves upwards to the starting height, and the material pressing ring (3) moves upwards to the starting position.

7. The method of forming an aluminum hood inner panel according to claim 6, wherein: the method for downwards moving or upwards moving the concave die (1) comprises the following steps: the female die (1) is fixed on a press sliding block, and the female die (1) is driven to move downwards by the downward movement of the press sliding block.

8. The method of forming an aluminum hood inner panel according to claim 7, wherein: the driving method for the material pressing ring (3) to move upwards or downwards comprises the following steps: and fixing the material pressing ring (3) with a hydraulic cushion support rod of the press, and driving the material pressing ring (3) to move up or down by the hydraulic cushion support rod.

9. The method of forming an aluminum hood inner panel according to claim 8, wherein: the method for synchronously moving the female die (1) and the material pressing ring (3) downwards comprises the following steps: the female die (1) and the material pressing ring (3) are driven to synchronously move downwards along the hydraulic cushion support rod by the downward movement of the press sliding block.

10. The method of molding an aluminum hood inner panel according to claim 9, wherein: the method comprises the following steps:

the method comprises the following steps: placing the sheet material on a material pressing ring (3), driving a female die (1) to move downwards from a top dead center to a position where the female die (1) is matched with the material pressing ring (3) by a press sliding block, and synchronously moving the female die (1) and the material pressing ring (3) downwards to finish the forming of a draw bead of the sheet material in a material pressing ring area;

step two: the female die (1) and the pressure ring (3) continuously and synchronously move downwards, the pressure plate (4) is matched with the male die (2), and meanwhile, the female die (1) and the pressure plate (4) continuously move downwards to finish the forming of the draw bead of the plate material in the area of the pressure plate;

step three: the female die (1) and the material pressing ring (3) synchronously move downwards again, and the material pressing plate (4) shrinks towards the inner side of the female die (1) until the female die (1) and the male die (2) are matched to finish part forming;

step four: the press sliding block drives the female die (1) to move upwards, the female die (1) is separated from the plate, the pressure plate (4) extends out of the female die (1), the pressure plate (4) is separated from the plate, the press sliding block continuously drives the female die (1) to move upwards to an upper dead point, and the hydraulic cushion support rod drives the pressure ring (3) to move upwards to an initial position.

Technical Field

The invention relates to the technical field of automobile production and forming, in particular to a forming die and a forming method for an aluminum hood inner plate.

Background

With the increasingly competitive trend of the domestic automobile industry, excellent automobile performance and relatively low cost are important factors for promoting the market occupation rate of products. As a hot spot in the field of research on cost reduction and weight reduction of automobile panels, the proportion of aluminum sheets in automobile body members has been increasing year by year in recent years, and aluminum sheets have a better weight reduction space than conventional steel sheets, but the elongation and allowable deformation of aluminum sheets are significantly lower than those of steel sheets, so that the problems of cracking and springback are very likely to occur during the forming process of aluminum sheets. In order to solve the above problems, the inner plate of the aluminum hood generally adopts a traditional closed drawing scheme, as shown in fig. 13, in the stamping process, a complete and closed pressing surface and a drawing bead are arranged in a process supplement surface area at the periphery of a final part, so that the inward uniform flow of an external plate material is controlled, and the formability of the part is ensured, so as to meet the quality requirement of the part. In the design of the die, a traditional female die, a male die and a material pressing ring are used as main components, on a press, the female die is fixed on a slide block of the press, the male die is fixed on a table board of the press, and the material pressing ring is arranged in the male die and driven by a hydraulic cushion support rod in the table board of the press. In the pressing process, the pressing ring is initially in a jacking state, the female die is firstly contacted with the pressing ring to finish forming of the draw bead, then the female die and the pressing ring clamp the sheet material and press the sheet material towards the direction of the male die until forming is finished, then the female die and the pressing ring clamp the sheet material and move back to the direction of the male die, the sheet material is separated at the initial jacking position of the pressing ring, the female die continues to move to the upper dead point of the press sliding block, and the pressing process is finished. The full-closed drawing is used for setting more process supplement molded surfaces generated by a material pressing surface, the material utilization rate is relatively low, the width of a draw bead can be increased technically, the blanking size is increased, and the improvement of the utilization rate of an aluminum plate material is limited. Due to poor formability of the aluminum piece, the maximum allowable thinning rate of the aluminum plate is generally set to 16% in the drawing process, and the thinning rate is relatively high in the corner area of the air window of the hood inner plate under the closed drawing process. In the industrial process of products, cracking is easy to generate due to high thinning rate, and the test of forming margin is difficult to guarantee.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provide a forming die and a forming method of an aluminum hood inner plate, which can effectively avoid aluminum cracking and springback and reduce blanking size.

In order to realize the purpose, the forming die for the aluminum hood inner plate comprises a female die, a male die and a material pressing ring, wherein the female die and the male die are arranged up and down, and the material pressing ring is positioned between the female die and the male die, and is characterized in that: it still including set up in the pressure flitch in the die, the pressure flitch with be connected with elasticity reset structure between the die, press the material circle wholly to insert in the convex mould, the die with press the distance between the material circle to be less than press the flitch with press the distance between the material circle.

Furthermore, the male die comprises an annular male die holder and a male die body positioned in the middle of the male die holder, the material pressing ring is an annular material pressing ring matched with the male die holder, and a plurality of inserting rods which are arranged downwards and can be inserted into gaps between the male die holder and the male die body are arranged on the bottom surface of the material pressing ring at intervals along the circumferential direction of the material pressing ring.

Furthermore, the female die comprises an annular female die seat corresponding to the material pressing ring and a female die body arranged in the middle of the female die seat, and the material pressing plate is a long straight plate arranged inside one side of the female die seat along the length direction of the female die seat.

Furthermore, the elastic reset structure comprises a nitrogen spring connected between the pressure plate and the die holder.

Furthermore, a damping limiter is connected between the pressure plate and the die holder.

A method for forming an inner plate of an aluminum hood comprises the forming die of the inner plate of the aluminum hood, wherein a plate is placed on a material pressing ring, a female die moves downwards, the female die is matched with the material pressing ring, the female die and the material pressing ring synchronously move downwards, a drawing rib of the plate is processed in the area of the material pressing ring, the material pressing plate is matched with a male die, the female die and the material pressing ring continuously and synchronously move downwards, the drawing rib of the plate in the area of the material pressing plate is processed, the female die and the material pressing ring synchronously move downwards again to a position where the female die and the male die are completely matched, part forming is completed, the female die moves upwards to the initial height, and the material pressing ring moves upwards to the initial position.

Further, the method for moving the concave die downwards or upwards comprises the following steps: and fixing the female die on the press sliding block, and driving the female die to move downwards through the downward movement of the press sliding block.

Further, the driving method for moving the material pressing ring upwards or downwards is as follows: and fixing the material pressing ring with a hydraulic cushion support rod of the press, and driving the material pressing ring to move upwards or downwards by the hydraulic cushion support rod.

Further, the method for synchronously moving the female die and the material pressing ring downwards comprises the following steps: the female die and the material pressing ring are driven to synchronously move downwards along the hydraulic cushion support rod by the downward movement of the press sliding block.

Further, the method for forming the aluminum hood inner panel includes the steps of:

the method comprises the following steps: placing the sheet material on a material pressing ring, driving a female die to move downwards from a top dead center to a position where the female die is matched with the material pressing ring by a press sliding block, and synchronously moving the female die and the material pressing ring downwards to finish the forming of the draw bead of the sheet material in the region of the material pressing ring;

step two: the female die and the material pressing ring continuously move downwards synchronously, the material pressing plate is matched with the male die, and meanwhile, the female die and the material pressing plate continuously move downwards to finish the forming of the draw bead of the plate material in the region of the material pressing plate;

step three: the female die and the material pressing ring synchronously move downwards again, and the material pressing plate shrinks towards the inner side of the female die until the female die and the male die are matched, so that part forming is completed;

step four: the press sliding block drives the female die to move upwards, the female die is separated from the sheet, the pressure plate extends out of the female die and is separated from the sheet, the press sliding block continuously drives the female die to move upwards to the upper dead point, and the hydraulic cushion support rod drives the pressure ring to move to the initial position.

The invention has the beneficial effects that: compared with closed drawing, the hood inner plate part designed by the invention adopts an open drawing processing mode, the overall material utilization rate of the plate is improved by about 5%, and the manufacturing cost of the hood inner plate is effectively reduced. The requirement of the opening drawing area on the formability of the material is relatively low, and no material pressing rib is arranged in the corner area of the air window of the hood inner plate, so that the reduction rate of the plate material in the area is relatively reduced, the feasibility of forming margin test is improved, and the cracking risk of parts is reduced.

Drawings

FIG. 1 is a perspective view of a mold for molding an aluminum hood inner panel according to the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a top view of the female mold of the present invention;

FIG. 4 is a top view of a swage ring of the present invention;

FIG. 5 is a top view of a nip plate according to the present invention;

FIG. 6 is a top view of the male mold of the present invention;

FIG. 7 is a longitudinal sectional view of the forming die of the present invention in an initial state;

FIG. 8 is a longitudinal sectional view of a forming die when a female die is matched with a material pressing ring in the invention;

FIG. 9 is a longitudinal sectional view of the forming mold in which the female mold and the material pressing ring move downward synchronously and the material pressing plate is about to be matched with the male mold in the invention;

FIG. 10 is a longitudinal sectional view of the forming mold with the swage plate and the punch being engaged together, with the female mold and the swage ring moving down synchronously;

FIG. 11 is a longitudinal sectional view of the forming mold when the female mold and the swage ring move down again synchronously and the male and female molds are closed;

FIG. 12 is a front view of a hood inner panel structure formed by open drawing according to the present invention;

FIG. 13 is a front view of a hood inner panel structure formed by drawing in a closed draw according to the prior art;

the device comprises a female die (1.1-a female die holder, 1.2-a female die body), a male die (2.1-a male die holder, 2.2-a male die body), a pressing ring (3), a pressing plate (4), an insertion rod (5), a nitrogen spring (6), a damping limiter (7), a hood inner plate (8), a circumferential draw bead (9), a wind window corner area draw bead (10), and a process supplement panel (11).

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

The forming die for the aluminum hood inner plate shown in fig. 1-12 comprises a female die 1, a male die 2, a material pressing ring 3 located between the female die 1 and the male die 2, and a material pressing plate 4 arranged in the female die 1.

The female die 1 comprises an annular female die seat 1.1 corresponding to the material pressing ring 3 and a female die body 1.2 arranged in the middle of the female die seat 1.1, and the material pressing plate 4 is a long straight plate arranged inside one side of the female die seat 1.1 along the length direction of the female die seat 1.1. A nitrogen spring 6 and a damping limiter 7 are connected between the pressure plate 4 and the female die 1.

The male die 2 comprises an annular male die holder 2.1 and a male die body 2.2 positioned in the middle of the male die holder 2.1, the material pressing ring 3 is an annular material pressing ring matched with the male die holder 2.1, the material pressing ring 3 can be integrally inserted into the male die 2, and the distance between the female die 1 and the material pressing ring 3 is smaller than the distance between the material pressing plate 4 and the material pressing ring 3. The bottom surface of the material pressing ring 3 is provided with a plurality of inserting rods 5 which are arranged downwards at intervals along the circumferential direction and can be inserted into the gap between the convex die holder 2.1 and the convex die body 2.2.

Based on the forming die for the aluminum hood inner plate, a plate material 8 is placed on a material pressing ring 3, a female die 1 is fixed on a press sliding block, the material pressing ring 3 is fixed with a hydraulic cushion support rod of a press, the female die 1 is driven to move downwards through downward movement of the press sliding block, the female die 1 is matched with the material pressing ring 3, the female die 1 and the material pressing ring 3 synchronously move downwards, a drawing rib of the plate material in the region of the material pressing ring is processed, a material pressing plate 4 is matched with a male die 2, the female die 1 and the material pressing ring 3 are driven to synchronously move downwards along the hydraulic cushion support rod through downward movement of the press sliding block, the drawing rib of the plate material 3 in the region of the material pressing plate is processed, the female die 1 and the material pressing ring 3 synchronously move downwards again to a position where the female die and the male die 2 are completely matched, part forming is completed, the female die 1 moves upwards to an initial height, and the material pressing ring 3 moves upwards to an initial position.

Specifically, the forming method of the aluminum hood inner plate comprises the following steps:

the method comprises the following steps: placing the sheet material on the material pressing ring 3, driving the female die 1 to move downwards from the top dead center to the position where the female die 1 is matched with the material pressing ring 3 by a press sliding block, and synchronously moving the female die 1 and the material pressing ring 3 downwards to finish the forming of the draw bead of the sheet material in the material pressing ring area;

step two: the female die 1 and the material pressing ring 3 continuously and synchronously move downwards, the material pressing plate 4 is matched with the male die 2, and meanwhile, the female die 1 and the material pressing plate 4 continuously move downwards to finish the forming of the draw bead of the plate material in the region of the material pressing plate;

step three: the female die 1 and the material pressing ring 3 synchronously move downwards again, and the material pressing plate 4 shrinks towards the inner side of the female die 1 until the female die 1 and the male die 2 are matched to finish the part forming;

step four: the press sliding block drives the female die 1 to move upwards, the female die 1 is separated from the plate, the pressure plate 4 extends out of the female die 1, the pressure plate 4 is separated from the plate, the press sliding block continuously drives the female die 1 to move upwards to an upper dead point, and the hydraulic cushion support rod drives the pressure ring 3 to move upwards to an initial position.

According to the invention, the processing method of opening drawing is successfully implemented on the inner plate of the aluminum plate hood, so that a new thought and example support is provided for improving the utilization rate of aluminum plate materials, and a new process reference is provided for reducing the drawing cracking risk of the wind window corner area of the inner plate of the aluminum hood. The forming contact time of the female die 1, the pressure plate 4, the pressure ring 3, the male die 2 and the like is relatively fixed, and different from a closed drawing process, a time difference exists between the forming of the draw bead of the pressure ring 3 and the forming of the draw bead of the pressure plate 4 in the invention, and the time difference ensures the feasibility of the forming.

The alternative scheme of the invention can use the upper die pressing surface as a whole, the lower die divides the integral structure of the male die 2 and the pressing plate 4, the process profile of the opening drawing area is not changed, the working principle is consistent with the scheme, and the difference is that the upper position and the lower position of the movable pressing area are changed.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.