Composite drawing die for upper outer plate of convex rear wall of cab of heavy truck

Abstract

The utility model discloses a composite drawing die for an outer plate on the upper portion of a convex rear wall of a heavy truck cab, and relates to the technical field of heavy truck part machining. A mounting cavity is formed in the female die; a material pressing nitrogen cylinder is mounted in the mounting cavity; the material pressing nitrogen cylinder is partially located in the upper die movable material pressing core. The bottom of the upper die movable pressing core is in contact with a blank; the material pressing nitrogen cylinder drives the upper die movable material pressing core to downwards press the blank; the machine tool drives the female die to gradually move downwards to be in contact with the pressing balance block, so that the female die and the upper die movable pressing core press the blank, and primary drawing is achieved; the machine tool drives the female die and the upper die movable pressing core to gradually move downwards to the blank holder to synchronously move, so that the female die and the male die tightly press the blank, and secondary drawing is achieved; according to the die, a set of drawing die and a machining procedure are omitted, original procedure piece overturning operation between procedures is omitted, workpiece scratching and deformation in the overturning process are avoided, and the appearance quality of products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy truck parts processing, in particular to a composite stretching die for an upper outer plate of a convex rear enclosure outside a heavy truck cab. Background Art

[0002] The process scheme adopted for processing the upper outer panel of the convex rear enclosure of the cab of a traditional heavy-duty truck is: OP10 drawing once, OP20 drawing twice, OP30 trimming, OP40 flanging and shaping, and OP50 trimming and punching. Among them, OP10 and OP20 are realized through two drawing processes. After OP10 is stretched, it is turned upside down 180 degrees before completing the second stretching. The flipping process is not only labor-intensive but also easy to cause scratches and deformation of the workpiece, which will directly affect the appearance quality of the product. In addition, the two stretching processes occupy one more stretching machine tool, and the manufacturing cost will also increase accordingly.

[0003] Therefore, in view of the problems existing in the process methods used for processing the upper outer panel of the convex rear enclosure of the traditional heavy-duty truck cab, a mold with optimized structure is designed to save processing steps, reduce workload, avoid scratches and deformation of parts during the flipping process, and ensure the quality of product appearance to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab, which optimizes the structure, saves processing steps, reduces workload, avoids scratches and deformation of parts during the flipping process, and ensures the appearance quality of the product.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A composite stretching die for the upper outer panel of the rear convex enclosure of a heavy truck cab, the die comprising a concave die, a convex die, a blank holder, a lower die seat, a material pressure balance block, a lower die balance block, a die head guide plate, an inner guide plate and an air cushion ejector rod, wherein the machine tool slide block drives the concave die downward, the lower die seat, the convex die and the concave die are sequentially arranged from bottom to top, a blank holder is installed between the concave die and the lower die seat, a material pressure balance block is installed between the concave die and the upper end face of the blank holder, a lower die balance block is installed between the lower end face of the blank holder and the lower die seat, a die head guide plate is installed between the blank holder and the concave die, an inner guide plate is installed between the blank holder and the convex die, and the air cushion ejector rod passes through the lower die seat and is supported at the bottom of the blank holder;

[0007] A receiving space for placing the blank is formed between the concave die and the convex die;

[0008] The die is provided with a mounting cavity;

[0009] A material pressing nitrogen cylinder is installed in the installation cavity;

[0010] The nitrogen cylinder for pressing materials is located in the movable pressing core of the upper mold;

[0011] The bottom of the movable pressing core of the upper die is in contact with the blank;

[0012] The nitrogen pressing cylinder drives the movable pressing core of the upper die to press the blank downward;

[0013] The machine tool drives the concave die to gradually move downward until it contacts the pressure balance block, so that the concave die and the upper die movable pressure core press the blank to achieve one-time drawing;

[0014] The machine tool drives the concave die and the upper die movable pressing core to gradually move downward until the blank holder moves synchronously to form the concave die and the convex die to press the blank to achieve secondary drawing.

[0015] Furthermore, the lower end surface of the die is formed with a convex edge portion and a convex edge portion;

[0016] The upper end surfaces of the two groups of blank holders are respectively formed with a concave edge part one and a concave edge part two corresponding to the positions of the convex edge part one and the convex edge part two;

[0017] The concave die gradually descends until the first convex edge is embedded in the first concave edge, and the second convex edge is embedded in the second concave edge to achieve compaction of the blank to form a stepped pressing surface.

[0018] Furthermore, a U-shaped notch is provided on the movable pressing core of the upper die on one side;

[0019] A cushion block is installed at the bottom of the U-shaped notch;

[0020] The driving end of the nitrogen cylinder for pressing materials is located in the U-shaped notch and drives the movable pressing core of the upper die to move through the cushion block.

[0021] Furthermore, a movable pressing core guide slide plate is installed between the movable pressing core of the upper mold on the other side and the inner wall of the installation cavity, and the movable pressing core of the upper mold and the concave mold are movably connected via a discharge screw;

[0022] The movable pressing core of the upper die is separated from the pressure ring to form the movable pressing core of the upper die which moves downward relative to the concave die and the moving distance is limited by the unloading screw.

[0023] Furthermore, the machine tool drives the die to gradually move downward, and the piston of the nitrogen cylinder for pressing material retreats to move the die to contact with the pressing material balance block;

[0024] The machine tool drives the die to gradually move downward, and the air cushion push rod supports the blank holder to be fixed in position so as to enable the die and the upper die movable pressing core to press the blank.

[0025] In the above technical scheme, the composite stretching die for the upper outer panel of the outer convex rear enclosure of the heavy truck cab of the utility model has the following beneficial effects:

[0026] The utility model has an optimized structure of the composite stretching die for the upper outer panel of the convex rear enclosure of the heavy-duty truck cab. The quality and process of the die are stable and reliable. A composite structure of positive and negative drawing is adopted, which saves a set of drawing dies and a processing step, and eliminates the original process part flipping operation between the processes. While reducing the workload, it can avoid scratches and deformation of the workpiece during the flipping process, thereby ensuring the appearance quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the structure of a composite stretching die for the upper outer panel of the convex rear enclosure of a heavy truck cab provided in an embodiment of the utility model (OP20 drawing process 2 process parts convex rear drawing completed);

[0029] Figure 2 A schematic diagram of the structure of a composite drawing die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab provided in an embodiment of the utility model (the composite drawing die of OP10 drawing process 1 and OP20 drawing process 2 are opened);

[0030] Figure 3 A schematic structural diagram of a composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab provided in an embodiment of the utility model (a die state in which OP10 drawing process 1 is in progress);

[0031] Figure 4 A schematic structural diagram of a composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab provided in an embodiment of the utility model (a die state when OP10 drawing process 1 is completed).

[0032] Description of reference numerals:

[0033] 1. Concave die; 2. Punch die; 3. Blank holder; 4. Lower die seat; 5. Pressing balance block; 6. Lower die balance block; 7. Die head guide plate; 8. Inner guide plate; 9. Air cushion ejector rod; 10. Mounting cavity; 11. Pressing nitrogen cylinder; 12. Upper die movable press core; 13. Cushion block; 14. Movable press core guide plate; 15. Unloading screw;

[0034] 101, convex edge part 1; 102, convex edge part 2;

[0035] 301, concave edge part 1; 302, concave edge part 2;

[0036] 1201, U-shaped notch. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings.

[0038] It should be noted that the orientation or positional relationship indicated by the terms "bottom", "upper end", "lower end", "one side", "the other side", etc. used herein is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description. Similar expressions are only for the purpose of illustration, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model; in addition, the terms "a part", "two parts", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] See Figures 1 - 4 as shown in

[0040] The compound drawing die for the upper outer panel of the convex rear enclosure of a heavy-duty truck cab includes:

[0041] This die includes a female die 1, a male die 2, a blank holder 3, a lower die base 4, a blank holding balance block 5, a lower die balance block 6, a die head guide slide 7, an inner guide slide 8 and an air cushion ejector rod 9. Among them, the machine tool slider drives the female die 1 to move downward. The lower die base 4, the male die 2 and the female die 1 are distributed in sequence from bottom to top. A blank holder 3 is installed between the female die 1 and the lower die base 4. A blank holding balance block 5 is installed between the upper end faces of the female die 1 and the blank holder 3. A lower die balance block 6 is installed between the lower end face of the blank holder 3 and the lower die base 4. A die head guide slide 7 is installed between the blank holder 3 and the female die 1. An inner guide slide 8 is installed between the blank holder 3 and the male die 2. The air cushion ejector rod 9 passes through the lower die base 4 and supports at the bottom of the blank holder 3;

[0042] A receiving space for placing a blank is formed between the female die 1 and the male die 2;

[0043] An installation cavity 10 is formed on the female die 1;

[0044] A blank holding nitrogen cylinder 11 is installed in the installation cavity 10;

[0045] Part of the blank holding nitrogen cylinder 11 is located in the upper die movable blank holding core 12;

[0046] The bottom of the upper die movable blank holding core 12 contacts the blank;

[0047] The blank holding nitrogen cylinder 11 drives the upper die movable blank holding core 12 to press down the blank;

[0048] The machine tool drives the female die 1 to gradually move downward until it contacts the blank holding balance block 5 to form the female die 1 and the upper die movable blank holding core 12 pressing the blank to achieve a first drawing;

[0049] The machine tool drives the die 1 and the upper die movable pressing core 12 to gradually move downward until the blank holder 3 moves synchronously to form the die 1 and the punch 2 to press the blank to achieve secondary drawing.

[0050] Specifically, the composite stretching die for the upper outer panel of the rear convex enclosure of the heavy truck cab combines the OP10 and OP20 stretching dies into a set of composite die dies, and completes the two stretching processes of OP10 and OP20 on a set of dies, avoiding the operation of flipping 180 degrees up and down between the OP10 and OP20 processes, wherein the blank is placed between the concave die 1 and the convex die 2, and a receiving space for placing the blank is formed between the concave die 1 and the convex die 2, and an installation cavity 10 is provided on the concave die 1, and a pressing material is installed in the installation cavity 10 Nitrogen cylinder 11, the pressing nitrogen cylinder 11 drives and connects the upper die active pressing core 12, and the upper die active pressing core 12 can contact the two ends of the blank in advance through the driving of the pressing nitrogen cylinder 11. Before the drawing work starts, the machine tool air cushion force is first adjusted to 1800KN. After the blank is placed in the accommodating space between the concave die 1 and the convex die 2, the machine tool slide drives the upper die (concave die 1) downward, and the upper die active pressing core 12 contacts the blank first, and starts pressing under the action of the pressing nitrogen cylinder 11, and the upper die continues to move downward. The die 1 contacts the blank. As the set machine tool air cushion force of 1800KN is greater than the sum of the forming force of 1200KN in the drawing process 1 and the pressing force of 80KN by the nitrogen cylinder 11, the blank holder 3 remains stationary up and down under the support of the machine tool air cushion force. The upper die continues to move downward, while the blank holder 3 remains stationary up and down. The upper die active pressing core 12 continues to press the blank under the action of the nitrogen cylinder 11. After that, the piston of the nitrogen cylinder 11 gradually retreats, while the upper die active pressing core 12 remains stationary up and down. Die 1 continues to descend until OP10 drawing process 1 is completed; the pressing balance block 5 contacts the die 1, and the die 1 and the upper die active pressing core 12 form an integral die with a stepped pressing surface; the machine tool continues to descend, and the whole formed by the die 1 and the upper die active pressing core 12 descends together under the drive of the machine tool, and the blank holder 3 presses the stepped pressing material under the action of the machine tool air cushion force, and descends together with the upper die under the force of the upper die, and the punch 2 remains stationary until the back convex drawing of the process part in OP20 drawing process 2 is completed.

[0051] Preferably, the die 1, the upper die movable pressing core 12, the blank holder 3, and the punch 2 of the die working parts are made of GGG70L ductile iron, and the lower die base 4 is made of HT300;

[0052] Due to the complex shape of the upper outer panel of the rear enclosure, the many convex and concave shapes of the rear convex part and the exposed part outside the cab, scratches are not allowed to occur. The working surfaces of the die 1, the upper die movable pressing core 12, the pressure ring 3 and the punch 2 are uniformly surface quenched by CNC laser, and the heat treatment hardness is HRC50-55.

[0053] A convex edge part 101 and a convex edge part 102 are formed on the lower end surface of the female die 1;

[0054] On the upper end surfaces of two sets of blank holding rings 3, a concave edge part 301 and a concave edge part 302 corresponding to the positions of the convex edge part 101 and the convex edge part 102 are respectively formed;

[0055] The female die 1 gradually moves downward until the convex edge part 101 is embedded in the concave edge part 301 and the convex edge part 102 is embedded in the concave edge part 302 to realize blank pressing and form a stepped blank holding surface.

[0056] Specifically, in the OP10 drawing process 1, the blank holding nitrogen cylinder 11 is the blank holding pressure source, and the upper die movable blank holding core 12 acts as the blank holding ring for pressing. Taking the lower contour part of the female die 1 as the drawing punch, that is, at the convex edge part 101 and the convex edge part 102, the blank holding ring 3 acts as the drawing die, that is, at the concave edge part 301 and the concave edge part 302. The female die 1 gradually moves downward, so that the convex edge part 101 and the convex edge part 102 are respectively pressed on the concave edge part 301 and the concave edge part 302. The blank is located between the female die 1 and the blank holding ring 3 and is pressed tightly. The machine tool air cushion provides a supporting force for the blank holding ring 3 through the air cushion ejector rod 9 to keep it stationary during the forward drawing process of the OP10 drawing process 1.

[0057] A U-shaped notch 1201 is formed on one side of the upper die movable blank holding core 12;

[0058] A cushion block 13 is installed at the bottom of the U-shaped notch 1201;

[0059] The driving end of the blank holding nitrogen cylinder 11 is located in the U-shaped notch 1201 and drives the upper die movable blank holding core 12 to move through the cushion block 13.

[0060] Specifically, a U-shaped notch 1201 is formed inside the upper die movable blank holding core 12. The U-shaped notch 1201 opens upward. A part of the blank holding nitrogen cylinder 11 is located in the U-shaped notch 1201 and the piston stretches downward. A cushion block 13 is installed at the bottom of the U-shaped notch 1201. When the piston of the blank holding nitrogen cylinder 11 stretches, it contacts the cushion block 13. The upper die movable blank holding core 12 moves downward through the drive of the blank holding nitrogen cylinder 11. The cushion block 13 can prevent the piston of the blank holding nitrogen cylinder 11 from directly contacting the bottom wall of the upper die movable blank holding core 12 and prevent damage.

[0061] On the other side, a movable blank holding core guide slide plate 14 is installed between the upper die movable blank holding core 12 and the inner wall of the installation cavity 10, and the upper die movable blank holding core 12 is movably connected to the female die 1 through a stripping screw 15;

[0062] When the upper die movable blank holding core 12 is separated from the blank holding ring 3, the upper die movable blank holding core 12 moves downward relative to the female die 1 and the moving distance is limited by the stripping screw 15.

[0063] Specifically, the movable pressure pad guide slide plate 14 is installed between the upper die movable pressure pad 12 and the installation cavity 10 of the female die 1, and is used to assist the upper die movable pressure pad 12 to move up and down inside the female die 1 to prevent the upper die movable pressure pad 12 from shifting; the unloading screw 15 connects the upper die movable pressure pad 12 and the female die 1 together. When the upper die movable pressure pad 12 separates from the blank holder 3, the unloading screw 15 limits the downward movement stroke of the upper die movable pressure pad 12 relative to the female die 1.

[0064] The machine tool drives the female die 1 to gradually descend, and the piston of the pressure pad nitrogen cylinder 11 retracts to realize the movement of the female die 1 until it contacts the pressure pad balance block 5;

[0065] The machine tool drives the female die 1 to gradually descend, and the air cushion ejector rod 9 supports the position of the blank holder 3 to be fixed to realize the pressing of the blank by the female die 1 and the upper die movable pressure pad 12.

[0066] Specifically, in the OP10 drawing process 1, the air cushion ejector rod 9 can continuously support the blank holder 3 to keep it stationary up and down. During the process of the machine tool driving the female die 1 to gradually descend, the piston of the pressure pad nitrogen cylinder 11 will gradually retract, making the pressure pad nitrogen cylinder 11 gradually approach the female die 1. Then the female die 1 moves down to contact the blank. With the drive of the machine tool, the female die 1 can press some positions of the blank, thus completing the first drawing process.

[0067] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A composite stretching die for the upper outer panel of the rear convex enclosure of a heavy truck cab, the die comprising a die (1), a punch (2), a blank holder (3), a lower die seat (4), a material pressing balance block (5), a lower die balance block (6), a die head guide slide plate (7), an inner guide slide plate (8) and an air cushion push rod (9), wherein a machine tool slide drives the die (1) downward, the lower die seat (4), the punch (2) and the die (1) are arranged in sequence from bottom to top, and a gas cushion push rod (9) is installed between the die (1) and the lower die seat (4). A blank holder (3), a material holding balance block (5) is installed between the die (1) and the upper end surface of the blank holder (3), a lower die balance block (6) is installed between the lower end surface of the blank holder (3) and the lower die seat (4), a die head guide slide plate (7) is installed between the blank holder (3) and the die (1), an inner guide slide plate (8) is installed between the blank holder (3) and the punch (2), and the air cushion push rod (9) passes through the lower die seat (4) and is supported at the bottom of the blank holder (3), characterized in that: A receiving space for placing a blank is formed between the concave die (1) and the convex die (2); The die (1) is provided with a mounting cavity (10); A material pressing nitrogen cylinder (11) is installed in the installation cavity (10); The nitrogen cylinder (11) for pressing materials is partially located in the movable pressing core (12) of the upper mold; The bottom of the movable pressing core (12) of the upper die is in contact with the blank; The nitrogen pressing cylinder (11) drives the upper mold movable pressing core (12) to press the blank downward; The machine tool drives the die (1) to gradually move downward until it contacts the pressure balance block (5) so that the die (1) and the upper die movable pressure core (12) press the blank to achieve one-time drawing; The machine tool drives the concave die (1) and the upper die movable pressing core (12) to gradually move downward until the blank holder (3) moves synchronously to form the concave die (1) and the punch (2) to press the blank to achieve secondary drawing.

2. The composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab according to claim 1, characterized in that: The lower end surface of the die (1) is formed with a convex edge portion (101) and a convex edge portion (102); The upper end surfaces of the two groups of pressure rings (3) are respectively formed with a concave edge portion (301) and a concave edge portion (302) corresponding to the positions of the convex edge portion (101) and the convex edge portion (102); The concave die (1) gradually descends until the convex edge part (101) is embedded in the concave edge part (301), and the convex edge part (102) is embedded in the concave edge part (302) to achieve compaction of the blank to form a stepped pressing surface.

3. The composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab according to claim 2, characterized in that: A U-shaped notch (1201) is provided on the movable pressing core (12) of the upper die on one side; A cushion block (13) is installed at the bottom of the U-shaped notch (1201); The driving end of the nitrogen pressing cylinder (11) is located in the U-shaped notch (1201) and drives the upper mold movable pressing core (12) to move through the cushion block (13).

4. The composite stretching die for the upper outer panel of the outer convex rear enclosure of a heavy truck cab according to claim 3, characterized in that: A movable blank holding core guide slide plate (14) is installed between the other side of the upper die movable blank holding core (12) and the inner wall of the installation cavity (10), and the upper die movable blank holding core (12) is movably connected to the female die (1) through a stripper screw (15); The upper die movable blank holding core (12) is separated from the blank holder (3), so that the upper die movable blank holding core (12) moves downward relative to the female die (1), and the moving distance is limited by the stripper screw (15).

5. The composite drawing die for the upper outer panel of the convex rear surround of a heavy truck cab according to claim 1, characterized in that: The machine tool drives the female die (1) to gradually descend, and the piston of the blank holding nitrogen cylinder (11) retracts to enable the female die (1) to move into contact with the blank holding balance weight (5); The machine tool drives the female die (1) to gradually descend, and the air cushion ejector rod (9) supports the blank holder (3) in a fixed position to enable the female die (1) to press the blank against the upper die movable blank holding core (12).

Images