A drawing die structure for rear floor of a car

Abstract

The present invention discloses a drawing die structure for a rear floor of a car, and relates to the technical field of drawing dies, including an upper die mechanism, a pressure edge mechanism and a lower die mechanism, wherein the upper die mechanism is located above the lower die mechanism, the pressure edge mechanism is located at the top of the lower die mechanism, the upper die mechanism includes an upper die seat, a plurality of buffer grooves are provided at the bottom of the upper die seat, the pressure edge mechanism includes a pressure edge ring, the pressure edge ring is used to press the sheet material to prevent wrinkling and cracking, a plurality of buffer convex molds are provided at the top of the pressure edge ring, the buffer convex molds are used to cooperate with the buffer grooves to form a buffer zone on the sheet material, and the lower die mechanism includes a lower die seat. The present invention improves the production efficiency of the rear floor of the car, and can limit the sheet material to avoid the position of the sheet material being offset before being pressed, which affects the molding quality, and can also reduce the probability of rebound of the sheet material after molding, thereby improving the quality of the rear floor of the car after molding.

Description

Technical Field

[0001] The invention relates to the technical field of drawing dies, in particular to a drawing die structure for a rear floor of a car. Background Art

[0002] The drawing die structure of the rear floor of a car is an important part in automobile manufacturing. Its design is directly related to the quality and material utilization rate of the rear floor parts. It is used to manufacture the rear floor of a car. It mainly includes an upper die mechanism and a lower die mechanism. The rear floor of a car has a strong integrity by forming with a punch and a concave die.

[0003] The patent document with publication number "CN211539138U" discloses "a car rear floor drawing die structure, wherein the lower die base assembly includes a lower die base and a first punch, a second punch, a guide plate, a pier block and a ejector connected to the cylinder. Through the double punch structure, the sheet size is reduced, the material utilization rate is improved, and the quality defects of the product caused by the flow of the sheet during the drawing process are eliminated." Although "the sheet size is reduced, the material utilization rate is improved, and the quality defects of the product caused by the flow of the sheet during the drawing process are eliminated", the rear floor of the car after forming is prone to rebound, resulting in deformation of the rear floor of the car. At the same time, there is a lack of corresponding limiting mechanism, and manual alignment is required during the placement of the sheet, which reduces production efficiency. In the process of moving the upper die base downward, the sheet may shift in position, affecting the forming quality. Summary of the invention

[0004] The main purpose of the present invention is to provide a car rear floor drawing die structure, which can effectively solve the technical problems raised by the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A car rear floor drawing die structure, comprising an upper die mechanism, a side pressing mechanism and a lower die mechanism, wherein the upper die mechanism is located above the lower die mechanism, the side pressing mechanism is located on the top of the lower die mechanism, the upper die mechanism comprises an upper die seat, a plurality of buffer grooves are provided at the bottom of the upper die seat, the side pressing mechanism comprises a side pressing ring, the side pressing ring is used to press the sheet material to prevent wrinkling and cracking, a plurality of buffer convex molds are provided on the top of the side pressing ring, the buffer convex molds are used to cooperate with the buffer grooves to form a buffer zone on the sheet material, and the lower die mechanism comprises a lower die seat;

[0007] Limiting mechanisms are arranged on both sides and the front and rear ends of the pressure ring, and the limiting mechanisms are used to position the sheet material. A re-pressing mechanism is arranged on the top of the upper die seat, and the re-pressing mechanism is used to press the upper die seat during the drawing process to increase the force-bearing area of ​​the upper die seat.

[0008] Specifically, the force-bearing area of ​​the upper die seat is increased to ensure that the sheet metal is subjected to uniform pressure. The sheet metal is blocked by the buffer punch during its flow, which reduces its flow speed and prevents it from flowing too fast, which would cause breakage and damage in areas with greater depth on the sheet metal forming surface. At the same time, a buffer zone is formed on the sheet metal through the buffer punch and the buffer groove to prevent deformation of the rear floor of the car after forming.

[0009] As a further solution of the present invention, the upper die mechanism further comprises a first die and a second die provided at the bottom of the upper die base, and upper die guide plates are fixedly mounted on both sides of the bottom of the upper die base.

[0010] As a further solution of the present invention, the lower die mechanism further comprises a first punch and a second punch fixedly mounted on the top of the lower die base, and guide slide plates are fixedly mounted on the top of the lower die base near the four corners.

[0011] Specifically, the mold closing accuracy is ensured. At the same time, the guide plate withstands the lateral force during the drawing process to protect the mold from damage.

[0012] As a further solution of the present invention, the lower die mechanism also includes a plurality of dead blocks fixedly mounted on the top of the lower die base and located around the first punch and the second punch.

[0013] Specifically, the mold closing accuracy is ensured, and at the same time, the mold is prevented from being deformed or broken during the mold closing process.

[0014] As a further solution of the present invention, the lower mold mechanism also includes four ejectors that penetrate through the top of the lower mold base.

[0015] Specifically, it is convenient to drive the ejector through the cylinder to eject the rear floor of the car from the drawing die structure, so as to facilitate the removal of the parts.

[0016] As a further solution of the present invention, the edge pressing mechanism further comprises a first mold avoiding groove and a second mold avoiding groove penetrating through the edge pressing ring, and two edge pressing guide plates are fixedly mounted on both sides of the bottom of the edge pressing ring.

[0017] Specifically, to ensure the correct positioning and flow of the sheet in the mold, the blank holder presses the sheet in other areas to prevent wrinkling and cracking of the sheet.

[0018] As a further solution of the present invention, the limiting mechanism includes a limiting plate, bases are provided on both sides of the limiting plate, and a top sliding plate is provided on the inner side of the limiting plate.

[0019] As a further solution of the present invention, the limit plate is movably connected to the base through a rotating shaft and a torsion spring, the base is fixedly connected to the outer periphery of the pressure ring, the top slide plate is fixedly connected to the outer periphery of the upper mold base, and the inner upper end of the limit plate and the outer lower end of the top slide plate are both inclined.

[0020] Specifically, it is convenient to quickly place and align the sheet material, and at the same time, it prevents the limiting mechanism from interfering with the upper mold mechanism and the lower mold mechanism to complete the mold closing process.

[0021] As a further solution of the present invention, the re-pressing mechanism includes two movable frames, two pressing rollers are movably installed between the two movable frames at the top ends, and a support plate is arranged below the movable frames.

[0022] As a further solution of the present invention, the shaft of the movable frame is movably connected to the side of the upper die base through a bearing, and the support plate is fixedly connected to the side of the lower die base.

[0023] Specifically, the force-bearing area of ​​the upper die seat is increased, thereby ensuring that the sheet metal is subjected to uniform pressure, improving the forming quality, and reducing the probability of rebound of the sheet metal after forming.

[0024] The beneficial effects of the present invention are:

[0025] The present invention sets a limiting mechanism. During the drawing process, the sheet metal is located on the top of the blank holder. The limiting plate limits the sheet metal, which is convenient for quickly placing and aligning the sheet metal and improving production efficiency. When the upper die seat descends, the limiting plate is squeezed by the top slide plate to gradually expand the limiting plate. While limiting, the limiting mechanism is prevented from interfering with the upper die mechanism and the lower die mechanism to complete the mold closing process.

[0026] The present invention provides a re-pressing mechanism. During the drawing process, as the upper die mechanism moves downward, the support plate presses against the bottom of the movable frame, and the angle of the movable frame gradually increases, driving the pressure roller to press the upper die seat, increasing the force-bearing area of ​​the upper die seat, thereby ensuring that the sheet material is subjected to uniform pressure, improving the forming quality, and reducing the probability of rebound of the sheet material after forming.

[0027] 3. The present invention provides a buffer groove and a buffer punch. The buffer punch blocks the flow of the sheet metal and reduces the flow speed of the sheet metal to avoid excessive flow of the sheet metal, which may cause breakage and damage in the area with a larger depth on the sheet metal forming surface. At the same time, the buffer punch cooperates with the buffer groove to form a buffer zone on the sheet metal. When the sheet metal is formed and demolded, if it rebounds, the buffer zone can provide buffering to avoid deformation of the rear floor of the car after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a drawing die structure of a rear floor of a car according to the present invention;

[0029] Figure 2 This is a disassembled view of the overall structure of a car rear floor drawing die structure of the present invention;

[0030] Figure 3It is a structural schematic diagram of a lower die mechanism in a drawing die structure of a rear floor of a car according to the present invention;

[0031] Figure 4 It is a structural schematic diagram of an upper die mechanism in a drawing die structure of a rear floor of a car according to the present invention;

[0032] Figure 5 This is a bottom-up view of an upper die mechanism in a drawing die structure for a rear floor of a car according to the present invention;

[0033] Figure 6 It is a structural schematic diagram of a side pressing mechanism in a drawing die structure of a rear floor of a car according to the present invention;

[0034] Figure 7 It is a structural schematic diagram of a re-pressing mechanism in a drawing die structure of a rear floor of a car according to the present invention;

[0035] Figure 8 It is a structural schematic diagram of a limiting mechanism in a drawing die structure of a rear floor of a car according to the present invention;

[0036] Fig. 9 The present invention is a side view of a limiting mechanism in a drawing die structure of a rear floor of a car.

[0037] In the figure:

[0038] 1. Upper die mechanism; 101. Upper die seat; 102. First die; 103. Second die; 104. Upper die guide plate; 105. Buffer groove;

[0039] 2. Edge pressing mechanism; 201. Edge pressing ring; 202. First die avoiding groove; 203. Second die avoiding groove; 204. Edge pressing guide plate; 205. Buffer punch;

[0040] 3. Lower die mechanism; 301. Lower die base; 302. First punch; 303. Second punch; 304. Dead block; 305. Ejector; 306. Guide slide plate;

[0041] 4. Limiting mechanism; 401. Limiting plate; 402. Base; 403. Top slide plate;

[0042] 5. Re-pressing mechanism; 501. movable frame; 502. pressing roller; 503. supporting plate. DETAILED DESCRIPTION

[0043] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0044] like Figure 1-Figure 9 As shown, a car rear floor drawing die structure, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 , including an upper die mechanism 1, a edge holding mechanism 2 and a lower die mechanism 3, the upper die mechanism 1 is located above the lower die mechanism 3, the edge holding mechanism 2 is located on the top of the lower die mechanism 3, the upper die mechanism 1 includes an upper die seat 101, a plurality of buffer grooves 105 are provided at the bottom of the upper die seat 101, the edge holding mechanism 2 includes an edge holding ring 201, the edge holding ring 201 is used to press the sheet material to prevent wrinkling and cracking, a plurality of buffer punches 205 are provided on the top of the edge holding ring 201, the buffer punches 205 are used to cooperate with the buffer grooves 105 to form a buffer zone on the sheet material, and the lower die mechanism 3 includes a lower die seat 301;

[0045] Limiting mechanisms 4 are provided on both sides and the front and rear ends of the pressure ring 201, and the limiting mechanisms 4 are used to position the sheet metal. A re-pressing mechanism 5 is provided on the top of the upper die seat 101, and the re-pressing mechanism 5 is used to press the upper die seat 101 during the drawing process to increase the force-bearing area of ​​the upper die seat 101.

[0046] Specifically, the sheet is placed on the top of the blank holder 201, and the sheet is limited by the limiting mechanism 4 to prevent the sheet from shifting before the pressure is applied. The blank holder 201 is lifted up by the pressure provided by the equipment. At this time, the blank holder 201 moves relative to the lower die seat 301, and the upper die seat 101 cooperates with the blank holder 201 to press tightly. During this process, the rear floor profile set on the blank holder 201 begins to take shape, and then the upper die seat 101 moves together with the blank holder 201 and moves relative to the lower die seat 301. The sheet begins to flow under the pressing action of the blank holder 201 and the upper die seat 101. Dynamic forming, and during the sheet forming process, the re-pressing mechanism 5 presses the upper die seat 101 to increase the force-bearing area of ​​the upper die seat 101, thereby ensuring that the sheet is subjected to uniform pressure. During the flow of the sheet, it is blocked by the buffer punch 205 to reduce the flow speed of the sheet to avoid excessive flow of the sheet, which may lead to fracture and damage in the area with a larger depth on the sheet forming surface. At the same time, a buffer zone is formed on the sheet through the buffer punch 205 and the buffer groove 105. When the sheet is formed and demolded, if the sheet rebounds, the buffer zone can provide buffering to avoid deformation of the rear floor of the car after forming.

[0047] Please refer to Figure 5 The upper die mechanism 1 further includes a first die 102 and a second die 103 which are provided at the bottom of the upper die base 101 , and upper die guide plates 104 are fixedly mounted on both sides of the bottom of the upper die base 101 .

[0048] Please refer to Figure 2 and Figure 3 The lower die mechanism 3 also includes a first punch 302 and a second punch 303 fixedly mounted on the top of the lower die base 301, and guide slide plates 306 are fixedly mounted on the top of the lower die base 301 near the four corners.

[0049] Specifically, during the drawing process of the rear floor of the car, the lower mold mechanism 3 remains stationary, and the upper mold mechanism 1 moves downward. When the upper mold base 101 contacts the sheet material during the downward movement, stamping and forming begins. The first die 102 cooperates with the first punch 302 to form the shape of the spare tire groove during the drawing process. The second die 103 cooperates with the second punch 303 to form a specific shape of the flange surface during the drawing process. The guide plate 306 cooperates with the upper mold guide plate 104 to guide the relative movement between the upper mold base 101 and the lower mold base 301 to ensure the mold closing accuracy. At the same time, the guide plate 306 withstands the lateral force during the drawing process to protect the mold from damage.

[0050] Please refer to Figure 2 and Figure 3 The lower die mechanism 3 also includes a plurality of blocking blocks 304 fixedly mounted on the top of the lower die base 301 and located around the first punch 302 and the second punch 303 .

[0051] Specifically, during the drawing process, the support is provided by the blocking block 304 to ensure the mold closing accuracy of the mold and prevent the mold from being deformed or broken during the mold closing process.

[0052] Please refer to Figure 2 and Figure 3 The lower mold mechanism 3 also includes four ejectors 305 that pass through the top of the lower mold base 301.

[0053] Specifically, during the drawing process, the ejector 305 is connected to the cylinder. After the drawing is completed, the ejector 305 is driven by the cylinder to eject the rear floor of the car from the drawing die structure, so as to facilitate the removal of the parts.

[0054] Please refer to Figure 2 and Figure 6 The edge pressing mechanism 2 further includes a first mold avoiding groove 202 and a second mold avoiding groove 203 which are arranged through the edge pressing ring 201 , and two edge pressing guide plates 204 are fixedly installed on both sides of the bottom of the edge pressing ring 201 .

[0055] Specifically, during the drawing process, the blank holder 201 cooperates with the upper die base 101 and the lower die base 301 through the blank holder guide plate 204 to realize the mold closing action and ensure the correct positioning and flow of the sheet in the mold. The sheet corresponding to the first punch 302 and the second punch 303 area passes through the first mold avoidance groove 202 and the second mold avoidance groove 203 to form corresponding grooves, and the blank holder 201 presses the sheet in other areas to prevent the sheet from wrinkling and cracking.

[0056] Please refer to Figure 2 , Figure 8 and Fig. 9The limiting mechanism 4 includes a limiting plate 401 , bases 402 are arranged on both sides of the limiting plate 401 , and a top slide plate 403 is arranged on the inner side of the limiting plate 401 .

[0057] Please refer to Figure 2 , Figure 8 and Fig. 9 The limit plate 401 is movably connected to the base 402 through a rotating shaft and a torsion spring. The base 402 is fixedly connected to the outer periphery of the pressure ring 201. The top slide plate 403 is fixedly connected to the outer periphery of the upper mold base 101. The inner upper end of the limit plate 401 and the outer lower end of the top slide plate 403 are both inclined.

[0058] Specifically, during the drawing process, the sheet material is located on the top of the pressure ring 201, and the sheet material is limited by the limiting plate 401, so as to facilitate the rapid placement and alignment of the sheet material. When the upper mold base 101 descends, the limiting plate 401 is squeezed by the top slide plate 403, so that the limiting plate 401 is gradually expanded, and while playing a limiting role, it prevents the limiting mechanism 4 from interfering with the upper mold mechanism 1 and the lower mold mechanism 3 to complete the mold closing process.

[0059] Please refer to Figure 2 and Figure 7 The re-pressing mechanism 5 includes two movable frames 501 , two pressing rollers 502 are movably installed between the two movable frames 501 at the top, and a support plate 503 is arranged below the movable frames 501 .

[0060] Please refer to Figure 2 and Figure 7 The shaft of the movable frame 501 is movably connected to the side of the upper die base 101 through a bearing, and the support plate 503 is fixedly connected to the side of the lower die base 301.

[0061] Specifically, during the drawing process, as the upper die mechanism 1 moves downward, the support plate 503 presses against the bottom of the movable frame 501, and the angle of the movable frame 501 gradually increases, driving the pressure roller 502 to press the upper die base 101, thereby increasing the force-bearing area of ​​the upper die base 101, thereby ensuring that the sheet is subjected to uniform pressure, improving the forming quality, and reducing the probability of rebound of the sheet after forming.

[0062] Working principle:

[0063] The sheet is placed on the top of the blank holder 201, and the cylinder is connected to the ejector 305, and the sheet is limited by the limit plate 401, which is convenient for quickly placing and aligning the sheet and improving production efficiency. The blank holder 201 is lifted up by the pressure provided by the equipment. At this time, the blank holder 201 and the lower die seat 301 move relative to each other, and the upper die seat 101 cooperates with the blank holder 201 to press tightly. In this process, the rear floor profile set on the blank holder 201 begins to form. Subsequently, the upper die seat 101 and the blank holder 201 move together and move relative to the lower die seat 301. The sheet begins to flow and form under the pressing action of the blank holder 201 and the upper die seat 101. When the upper die seat 101 descends, the limit plate 401 is squeezed by the ejector slide 403, so that the limit plate 401 is gradually expanded. While playing a limiting role, it prevents the limit mechanism 4 from interfering with the upper die mechanism 1 and the lower die mechanism 3 to complete the mold closing process, and in the process of sheet forming. In the process, as the upper mold mechanism 1 moves downward, the support plate 503 is pressed against the bottom of the movable frame 501, and the angle of the movable frame 501 gradually increases, driving the pressure roller 502 to press the upper mold base 101, increasing the force-bearing area of ​​the upper mold base 101, thereby ensuring that the sheet is subjected to uniform pressure, improving the molding quality, and reducing the probability of rebound after the sheet is formed. During the flow of the sheet, it is blocked by the buffer punch 205, which reduces the flow speed of the sheet to avoid the sheet flowing too fast, resulting in fracture and damage in the area with a larger depth of the sheet forming surface. At the same time, a buffer zone is formed on the sheet through the buffer punch 205 and the buffer groove 105. When the sheet is formed and demolded, if the sheet rebounds, it can provide buffering through the buffer zone to avoid deformation of the rear floor of the car after forming. After the drawing of the rear floor of the car is completed, the cylinder is started to drive the ejector 305 to eject the rear floor of the car from the drawing die structure to facilitate the removal of the parts.

[0064] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A car rear floor drawing die structure, characterized in that: The invention comprises an upper die mechanism (1), a side pressing mechanism (2) and a lower die mechanism (3), wherein the upper die mechanism (1) is located above the lower die mechanism (3), the side pressing mechanism (2) is located on the top of the lower die mechanism (3), the upper die mechanism (1) comprises an upper die seat (101), a plurality of buffer grooves (105) are provided at the bottom of the upper die seat (101), the side pressing mechanism (2) comprises a side pressing ring (201), the side pressing ring (201) is used to press the sheet material to prevent wrinkling and cracking, a plurality of buffer convex molds (205) are provided at the top of the side pressing ring (201), the buffer convex molds (205) are used to cooperate with the buffer grooves (105) to form a buffer zone on the sheet material, and the lower die mechanism (3) comprises a lower die seat (301); Limiting mechanisms (4) are provided on both sides and the front and rear ends of the blank holder (201), and the limiting mechanisms (4) are used to position the sheet metal. A re-pressing mechanism (5) is provided on the top of the upper die seat (101), and the re-pressing mechanism (5) is used to press the upper die seat (101) during the drawing process to increase the force-bearing area of ​​the upper die seat (101); The limiting mechanism (4) comprises a limiting plate (401), bases (402) are arranged on both sides of the limiting plate (401), a top slide plate (403) is arranged on the inner side of the limiting plate (401), the limiting plate (401) is movably connected to the base (402) via a rotating shaft and a torsion spring, the base (402) is fixedly connected to the outer periphery of the pressure ring (201), the top slide plate (403) is fixedly connected to the outer periphery of the upper die seat (101), and the inner side of the limiting plate (401) and the outer side of the top slide plate (403) are both arranged in an inclined surface; The re-pressing mechanism (5) comprises two movable frames (501), two pressing rollers (502) are movably mounted between the two movable frames (501) at the top ends, and a support plate (503) is arranged below the movable frames (501); The shaft of the movable frame (501) is movably connected to the side of the upper die seat (101) via a bearing, and the support plate (503) is fixedly connected to the side of the lower die seat (301).

2. A car rear floor drawing die structure according to claim 1, characterized in that: The upper die mechanism (1) further comprises a first concave die (102) and a second concave die (103) which are arranged at the bottom of the upper die seat (101), and upper die guide plates (104) are fixedly mounted on both sides of the bottom of the upper die seat (101).

3. The car rear floor drawing die structure according to claim 1, characterized in that: The lower die mechanism (3) further comprises a first punch (302) and a second punch (303) fixedly mounted on the top of the lower die base (301); guide slide plates (306) are fixedly mounted on the top of the lower die base (301) at four corners.

4. A car rear floor drawing die structure according to claim 3, characterized in that: The lower die mechanism (3) further comprises a plurality of blocking blocks (304) fixedly mounted on the top of the lower die base (301) and located around the first punch (302) and the second punch (303).

5. The car rear floor drawing die structure according to claim 1, characterized in that: The lower die mechanism (3) further comprises four ejectors (305) penetrating the top of the lower die base (301).

6. The car rear floor drawing die structure according to claim 1, characterized in that: The edge pressing mechanism (2) further comprises a first mold avoiding groove (202) and a second mold avoiding groove (203) which are arranged through the edge pressing ring (201), and two edge pressing guide plates (204) are fixedly mounted on both sides of the bottom of the edge pressing ring (201).

Images