A forming die and processing method for complex bent parts

Abstract

The present invention discloses a forming die for complex bent parts, comprising a punching and blanking die for cutting a strip material into the unfolded size of the bent part; and a multiple bending die for punching and bending the cut strip material. The present invention adopts independently arranged punching and blanking dies and multiple bending dies to independently realize the strip material punching function and the strip material punching and bending function, thereby improving the versatility and flexibility of the equipment, solving the problem of using one set of dies to produce stamping parts of various specifications and sizes, and solving the problem of reducing costs when producing multiple specifications and small batches.

Description

Technical Field

[0001] The invention relates to a forming die and a processing method for a complex bent part. Background Art

[0002] The die structure of continuous bending dies is generally relatively complex, and the design and production costs are high. For some small batches of stampings with continuous bending and punching processes, the economic benefits of using ordinary continuous dies are not good. Therefore, there is an urgent need for a die structure and a working method for stampings with punching and multiple bending processes that can economically obtain stampings while meeting production needs, and can produce stampings with continuous bending and punching processes of various specifications and sizes. Summary of the invention

[0003] In view of the defects of the above prior art, the main purpose of the present invention is to overcome the shortcomings of the prior art and disclose a forming die for complex bent parts, comprising:

[0004] The blanking die is used to cut the strip into the size of the bent part;

[0005] The multiple bending dies are used to punch and bend the cut strips;

[0006] The multiple bending mold includes a positioning mechanism, a stop pin, a punch, a first punch pad, a first punch fixing plate, a first lower die pad, a die and a first guide block, the first punch fixing plate is arranged on the upper die seat through the first punch pad, the die and the first guide block are arranged on the lower die seat through the first lower die pad, first guide plates are arranged on both sides of the die to form a first guide groove for guiding the strip material, a accommodating cavity and a guide cavity are formed between the die and the first guide block, the bending punch and the first elastic pressure plate are fixed on the first punch fixing plate, when bending, the lower end of the bending punch is limited in the guide cavity, the punch is fixed on the first punch fixing plate, a punching hole matching the punch is arranged on the die, the positioning mechanism is arranged on the die, the hole punched by the punch is positioned, and then the bending point of the strip material is positioned, the stop pin is slidably arranged on the guide plate, when not in use, the end of the stop pin is hidden in the guide plate; when in use, the stop pin enters the first guide groove.

[0007] Furthermore, the positioning mechanism includes a positioning pin and a sliding bolt, the sliding bolt is provided with a contraction surface, a convex surface and an inclined surface connecting the contraction surface and the convex surface, the die is vertically provided with a guide hole for guiding the positioning pin, the positioning pin is slidably arranged in the guide hole, and the sliding bolt is slidably arranged below the positioning pin; when the lower end of the positioning pin is at the contraction surface, the upper end of the positioning pin is hidden in the guide hole; when the lower end of the positioning pin is at the convex surface, the upper end of the positioning pin protrudes from the guide hole.

[0008] Furthermore, the positioning pin includes a pin body and a positioning head, the positioning head is arranged at the upper end of the pin body, and a chamfer is arranged at the lower end thereof, and the chamfer is parallel to the inclined surface.

[0009] Furthermore, the material stop pin includes a pin body and a working surface arranged at the end of the pin body, the bottom of the first material guide plate is recessed with a guide groove for installing the material stop pin, and a receiving groove for accommodating the working surface is arranged on one side close to the first guide groove.

[0010] Furthermore, the blanking die includes a second elastic pressing plate, an elastic supporting plate, a second punch fixing plate arranged on the upper die base through a second punch pad, and a second die pad arranged on the lower die base, the cutting die and the second guide block are arranged on the second die pad, the second elastic supporting plate is vertically guided between the cutting die and the second guide block, the second elastic pressing plate and the cutting punch are arranged on the second punch pad; when cutting, the second elastic pressing plate is pressed on the cutting die, and the cutting die and the cutting punch cooperate to cut the strip material.

[0011] Furthermore, a material stopping block is detachably provided on the elastic supporting plate.

[0012] Furthermore, the blanking die also includes the punch, which is arranged above the elastic supporting plate, and the elastic supporting plate is provided with matching punching holes.

[0013] A method for processing a complex bent part comprises the following steps:

[0014] S1, cutting the strip into the size of the bent part in the blanking die;

[0015] S2, placing the cut strips into a multiple bending die for punching and bending; wherein step S2 includes:

[0016] S21, pushing in a stopper pin, using the working surface of the stopper pin as a reference surface to determine the punching position of the first hole, and completing the punching of the first hole;

[0017] S22, pull out the stop pin, activate the positioning mechanism, connect the first hole to the positioning mechanism, determine the first bending line with the first hole as the reference hole, and determine the position of the second hole, completing the stamping and the first bending of the second hole;

[0018] S23, connecting the second hole to the positioning mechanism, determining the second bending line and the third hole with the second hole as the reference hole, and completing the punching and second bending of the third hole;

[0019] S24, connecting the third hole to the positioning mechanism, using the third hole as a reference hole to determine the third bending line, and completing the third bending.

[0020] Further, when the positions of the second bending line and the third bending line are offset, and the hole spacings of the first hole, the second hole, and the third hole remain unchanged, a punch is installed on the second punch fixing plate of the blanking die in step S1 according to the positions of the first hole, the second hole, and the third hole, so as to complete the punching while cutting;

[0021] In step S2, the punch is removed, the positioning pin is changed to change the distance from the positioning pin to the end of the die, and the strip is bent.

[0022] Beneficial effects achieved by the present invention:

[0023] The present invention adopts independently arranged blanking dies and multiple bending dies to independently realize the strip blanking function and the strip punching and bending function, thereby improving the versatility and flexibility of the equipment, solving the problem of producing stamping parts of various specifications and sizes with one set of dies, and solving the problem of reducing costs when producing multiple specifications and small batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a blanking die of a complex bending part forming die of the present invention;

[0025] Figure 2 It is a left view of a blanking die of a complex bending part forming die of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a multiple bending die of a complex bending part forming die of the present invention;

[0027] Figure 4 for Figure 3 BB section view in;

[0028] Figure 5 A top view of a multiple bending die of a complex bending part forming die of the present invention with the upper die portion removed;

[0029] Figure 6 It is the usage status diagram of the positioning mechanism;

[0030] Figure 7 is a schematic diagram of the structure of the positioning pin;

[0031] Figure 8 It is a structural schematic diagram of the material blocking pin;

[0032] Fig. 9 This is a schematic diagram of the structure of the workpiece after completion;

[0033] Fig.10 It is a workpiece state diagram after the multiple bending mold completes step S21;

[0034] Fig.11 It is a workpiece state diagram after the multiple bending mold completes step S22;

[0035] Fig.12 It is a workpiece state diagram after the multiple bending mold completes step S23;

[0036] Fig.13 Schematic diagram of the cooperation between the punching hole and the positioning pin after adjusting the strip pitch;

[0037] The reference numerals are as follows:

[0038] 1. Blanking die, 2. Multiple bending die, 3. Strip material, 11. Second elastic pressure plate, 12. Elastic support plate, 13. Second punch pad, 14. Second punch fixing plate, 15. Second die pad, 16. Cutting die, 17. Second guide block, 18. Second guide plate, 21. Positioning mechanism, 22. Stop pin, 23. Punch, 24. First punch pad, 25. First punch fixing plate, 26. First lower die pad Plate, 27, die, 28, first guide block, 29, first guide plate, 30, first elastic pressure plate, 31, bending punch, 40, cutting punch, 41, stop block, 211, positioning pin, 212, slide bolt, 213, contraction surface, 214, protruding surface, 215, inclined surface, 221, pin body, 222, working surface, 281, accommodating cavity, 282, guide cavity, 2111, pin shaft body, 2112, positioning head. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] A forming die for complex bent parts, such as Figure 1-8 As shown, including

[0041] The blanking die 1 cuts the strip material 3 into the unfolded size of the bent part;

[0042] The multiple bending mold 2 is used to punch and bend the cut strip material 3; wherein,

[0043] The multiple bending die 2 includes a positioning mechanism 21, a stop pin 22, a punch 23, a first punch pad 24, a first punch fixing plate 25, a first lower die pad 26, a die 27 and a first guide block 28. The first punch fixing plate 25 is arranged on the upper die seat through the first punch pad 24, the die 27 and the first guide block 28 are arranged on the lower die seat through the first lower die pad 26, and first guide plates 29 are arranged on both sides of the die 27 to form a first guide groove for guiding the strip material 3. An accommodating cavity 281 and a guide cavity 282 are formed between the die 27 and the first guide block 28. The bending punch 31 and the first elastic pressure plate 30 are fixed on the first punch fixing plate 25. When bending, the lower end of the bending punch 31 is restricted in the guide cavity 282, and the bending of the strip material is achieved by the cooperation between the bending punch 31 and the die 27. The punch 23 is fixed on the first punch fixing plate 25, and a punching hole matching the punch 23 is arranged on the die 27. The positioning mechanism 21 is arranged on the die 27 to position the hole punched by the punch 23 and then locate the bending point of the strip material 3. The material stop pin 22 is slidably arranged on the first guide plate 29. When it is necessary to block the strip material 3, the material stop pin 22 is pushed so that its end protrudes from the guide plate 29 and is placed in the first guide groove; when not in use, the material stop pin 22 is pulled to be hidden in the guide plate 29 without affecting the movement of the strip material 3 in the first guide groove.

[0044] In one embodiment, if Figure 1-8 As shown, the positioning mechanism 21 includes a positioning pin 211 and a sliding bolt 212. The sliding bolt 212 is provided with a contraction surface 213, a protruding surface 214 and an inclined surface 215 connecting the contraction surface 213 and the protruding surface 214. A guide hole for guiding the positioning pin is vertically provided on the die 27. The positioning pin 211 is slidably arranged in the guide hole, and the sliding bolt 212 is slidably arranged below the positioning pin 211. The positioning pin 211 is attached to the upper surface of the sliding bolt 212 by its own gravity, and the height difference between the contraction surface 213 and the protruding surface 214 is utilized to make the end of the positioning pin 211 disappear and protrude from the guide hole; that is, when the lower end of the positioning pin 211 is located on the contraction surface 213, the upper end of the positioning pin 211 is disappeared in the guide hole; when the lower end of the positioning pin 211 is located on the protruding surface 214, the upper end of the positioning pin 211 protrudes from the guide hole. In addition, an inclined surface 215 is provided between the contraction surface 213 and the protrusion surface 214 to ensure that the positioning pin 211 can smoothly switch between the contraction surface 213 and the protrusion surface 214 .

[0045] In one embodiment, if Figure 1-8As shown, the locating pin 211 includes a pin body 2111 and a locating head 2112. The locating head 2112 is arranged at the upper end of the pin body 2111, and a chamfer is arranged at the lower end thereof, and the chamfer is parallel to the inclined surface. Preferably, the locating head 2112 and the pin body 2111 are detachably connected, and can be connected by a threaded connection; the distance is adjusted left and right according to the bending point to select the locating head 2112 of the corresponding diameter to save costs. Of course, the locating pin 211 of the corresponding diameter locating head can also be directly replaced according to the needs, that is, the locating head 2112 and the pin body 2111 are in a stepped structure, such as Figure 7 In addition, the positioning pin 211 can also be an eccentric structure. The selection of positioning heads 2112 of different diameters to adjust the bending point is specifically described below.

[0046] In one embodiment, if Figure 1-8 As shown, the material stop pin 22 includes a pin body 221 and a working surface 222 arranged at the end of the pin body 221. A guide groove for installing the material stop pin 22 is recessed at the bottom of the first guide plate 29, and a receiving groove for accommodating the working surface 222 is arranged on one side close to the first guide groove.

[0047] In one embodiment, if Figure 1-8 As shown, the blanking die 1 includes a second elastic pressing plate 11, an elastic supporting plate 12, a second punch fixing plate 14 arranged on the upper die base through a second punch pad 13, and a second die pad 15 arranged on the lower die base, a cutting die 16 and a second guide block 17 are arranged on the second die pad 15, and second guide plates 18 are arranged on both sides of the cutting die 16 to form a second guide groove for guiding the strip material 3, the second elastic supporting plate 12 is vertically guided and arranged between the cutting die 16 and the second guide block 17, the second elastic pressing plate 11 and the cutting punch 40 are arranged on the second punch pad 13; when cutting, the second elastic pressing plate 11 is pressed on the cutting die 16, and the cutting die 16 and the cutting punch 40 cooperate to cut the strip material 3. Specifically, at least two guide rods are provided on both sides of the second elastic material pressing plate 11, and the guide rods are guided and matched with the second punch fixing plate 14, and a spring is sleeved on the guide rods, and the spring is used to press the second elastic material pressing plate 11 on the cutting die 16 to press the strip material 3. In addition, the elastic material supporting plate 12 can also adopt the same structure, that is, through the cooperation of the guide rods and the spring.

[0048] In one embodiment, if Figure 1-8 As shown, a stopper block 41 is detachably provided on the elastic support plate 12. The stopper block 41 limits the pushing distance of the strip material 3; that is, by adjusting the distance between the stopper block 41 and the cutting die 16, the cutting length of the strip material 3 is determined.

[0049] In one embodiment, if Figure 1-8As shown, the blanking die 1 also includes a punch 23, which is arranged above the elastic support plate 12, and the elastic support plate 12 is provided with matching punching holes. A product has three holes, so three punches 23 are provided, and are arranged on the second punch fixing plate 14, and the positions correspond to the positions of the holes on the product. The punching work is completed in one cutting process, and it is not necessary to punch in the bending die 2 multiple times.

[0050] The present invention also discloses a method for processing a complex bent part. Figure 1-13 As shown, the following steps are included:

[0051] S1, cutting the strip material 3 into the unfolded size of the bent part in the blanking die 1;

[0052] S2, placing the cut strip material 3 into the multiple bending die 2 for punching and bending; wherein step S2 includes:

[0053] S21, pushing the stopper pin 22 in, using the working surface 222 of the stopper pin 22 as a reference surface to determine the punching position of the first hole, and completing the punching of the first hole;

[0054] S22, pull out the stopper pin 22, activate the positioning mechanism 21, connect the first hole to the positioning mechanism, determine the first bending line with the first hole as the reference hole, and determine the position of the second hole, and complete the punching and the first bending of the second hole;

[0055] S23, connecting the second hole to the positioning mechanism 21, determining the second bending line and the third hole with the second hole as the reference hole, and completing the punching and second bending of the third hole;

[0056] S24, connecting the third hole to the positioning mechanism 21, determining the third bending line with the third hole as a reference hole, and completing the third bending.

[0057] Among them, the bending edge a=6mm, b=c=14mm, and the hole spacing of 12mm are used as an example for explanation; the strip material 3 is cut into a suitable size in the blanking die 1; the blocking pin 22 is pushed in, so that the blocking pin 22 is in a working state; the sliding bolt 212 is pulled out, so that the positioning pin 211 is in a non-working state, and the strip material 3 is placed in the first guide groove, and one end is attached to the working surface 222 of the blocking pin 22, the equipment is started, and step S21 is completed, and the process as shown in FIG. Fig.10 After the die returns, the stopper pin 22 is pulled out and is in a non-working state; the slide bolt 212 is pushed in so that the positioning pin protrudes from the upper surface of the cutting die 40 and is in a working state. The strip 3 is moved and the positioning of the strip 3 is achieved through the hole punched in step S21 and the positioning pin 211. The die starts the second stroke, completes the punching of the middle hole and the first bending (size a), completes step S22, and reaches the state shown in FIG. Fig.11After the mold returns, the strip 3 is moved and positioned through the new hole and the positioning pin 211. The mold starts the third stroke, completes the leftmost hole and the second bend (size b), and completes step S23, reaching the state shown in FIG. Fig.12 After the mold returns, the strip 3 is moved and positioned through the new hole and the positioning pin 211. The mold starts the fourth stroke and completes the third bend (size c). Step S24 is completed and the state is reached. Fig. 9 The mold returns, the finished workpiece is manually taken out, and the above actions are repeated to start the next cycle.

[0058] In addition, the above structure can also produce workpieces with adjusted dimensions of a, b, and c. The flexibility of the mold can be described by producing workpieces with a=7, b=15, c=15, the hole spacing becomes 13, and other dimensions remain unchanged.

[0059] The cutting size of the strip 3 is increased by 3mm, and the stopper pin 22 is replaced so that the distance between the working surface 222 of the stopper pin 22 and the center of the punch is increased by 3mm. The step distance of the strip 3 when punching and bending is increased by 1mm; specifically, the positioning head 2112 is replaced with a 2mm smaller diameter than the punching hole. When performing steps S22, S23, and S24, the strip 3 moves to the right so that the left side of the outer wall of the positioning head 2112 is in close contact with the left side of the inner wall of the punching hole, as shown in FIG. Fig.13 As shown, the step distance during bending is increased by 1 mm to 13 mm. By simply replacing the positioning pin 211 and the stop pin 22, the bending size can be adjusted, reducing the equipment cost.

[0060] When the sizes of b and c become larger, but the hole spacing requirement remains unchanged; that is, when the positions of the second bending line and the third bending line are offset, but the hole spacings of the first hole, the second hole and the third hole remain unchanged, the punch 23 is installed on the second punch fixing plate 14 of the blanking die in step S1 according to the positions of the first hole, the second hole and the third hole, and the punching is completed while cutting; in step S2, the punch 23 is removed, the positioning pin 211 is changed to change the distance from the positioning pin 211 to the end of the die 27, and the strip 3 is bent.

[0061] The above method is applicable when the sizes of b and c are equal. If the sizes of b and c are not equal, the production of similar products can be planned according to a single process. A batch of products can be bent uniformly for the Nth time first, and then the mold positioning is adjusted before the N+1th bending.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, they should all be included in the protection scope of the claims of the present invention.

Claims

1. A method for processing complex bent parts, characterized in that: The following steps are involved: S1, cutting the strip into the size of the bent part in the blanking die; S2, placing the cut strips into a multiple bending die for punching and bending; wherein step S2 includes: S21, pushing in a stopper pin, using the working surface of the stopper pin as a reference surface to determine the punching position of the first hole, and completing the punching of the first hole; S22, pull out the stop pin, activate the positioning mechanism, connect the first hole to the positioning mechanism, determine the first bending line with the first hole as the reference hole, and determine the position of the second hole, completing the stamping and the first bending of the second hole; S23, connecting the second hole to the positioning mechanism, determining the second bending line and the third hole with the second hole as the reference hole, and completing the punching and second bending of the third hole; S24, connecting the third hole to the positioning mechanism, using the third hole as a reference hole to determine a third bending line, and completing the third bending; The multiple bending mold includes a positioning mechanism, a stop pin, a punch, a first punch pad, a first punch fixing plate, a first lower die pad, a die and a first guide block, the first punch fixing plate is arranged on the upper die seat through the first punch pad, the die and the first guide block are arranged on the lower die seat through the first lower die pad, first guide plates are arranged on both sides of the die to form a first guide groove for guiding the strip material, a accommodating cavity and a guide cavity are formed between the die and the first guide block, the bending punch and the first elastic pressure plate are fixed on the first punch fixing plate, when bending, the lower end of the bending punch is limited in the guide cavity, the punch is fixed on the first punch fixing plate, a punching hole matching the punch is arranged on the die, the positioning mechanism is arranged on the die, the hole punched by the punch is positioned, and then the bending point of the strip material is positioned, the stop pin is slidably arranged on the guide plate, when not in use, the end of the stop pin is hidden in the guide plate; when in use, the stop pin enters the first guide groove.

2. A method for processing complex bent parts according to claim 1, characterized in that: The positioning mechanism includes a positioning pin and a sliding bolt. The sliding bolt is provided with a contraction surface, a convex surface and an inclined surface connecting the contraction surface and the convex surface. A guide hole for guiding the positioning pin is vertically provided on the die. The positioning pin is slidably arranged in the guide hole, and the sliding bolt is slidably arranged below the positioning pin. When the lower end of the positioning pin is at the contraction surface, the upper end of the positioning pin is hidden in the guide hole; when the lower end of the positioning pin is at the convex surface, the upper end of the positioning pin protrudes from the guide hole.

3. A method for processing complex bent parts according to claim 2, characterized in that: The positioning pin comprises a pin body and a positioning head. The positioning head is arranged at the upper end of the pin body, and a chamfer is arranged at the lower end thereof, and the chamfer is parallel to the inclined surface.

4. A method for processing complex bent parts according to claim 1, characterized in that: The material stop pin includes a pin body and a working surface arranged at the end of the pin body. The bottom of the first material guide plate is recessed with a guide groove for installing the material stop pin, and a receiving groove for accommodating the working surface is arranged on one side close to the first guide groove.

5. The method for processing a complex bent part according to claim 1, characterized in that: The blanking die includes a second elastic pressing plate, an elastic supporting plate, a second punch fixing plate arranged on the upper die base through a second punch pad, and a second die pad arranged on the lower die base, the cutting die and the second guide block are arranged on the second die pad, the elastic supporting plate is vertically guided and arranged between the cutting die and the second guide block, the second elastic pressing plate and the cutting punch are arranged on the second punch pad; when cutting, the second elastic pressing plate is pressed on the cutting die, and the cutting die and the cutting punch cooperate to cut the strip material.

6. A method for processing complex bent parts according to claim 5, characterized in that: The elastic supporting plate is provided with a detachable material blocking block.

7. A method for processing complex bent parts according to claim 5, characterized in that: The blanking die also includes the punch, which is arranged above the elastic supporting plate, and the elastic supporting plate is provided with matching punching holes.

8. A method for processing complex bent parts according to claim 1, characterized in that: When the positions of the second bending line and the third bending line are offset, and the hole spacings of the first hole, the second hole, and the third hole remain unchanged, a punch is installed on the second punch fixing plate of the blanking die in step S1 according to the positions of the first hole, the second hole, and the third hole, and punching is completed while cutting; In step S2, the punch is removed, the positioning pin is changed to change the distance from the positioning pin to the end of the die, and the strip is bent.

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