Hole flanging positioning die

Abstract

The utility model discloses a hole flanging positioning die which comprises an upper die and a lower die which are oppositely arranged, and a hole flanging positioning pin which is arranged on one of the upper die and the lower die. The special-shaped hole is formed in the other one of the upper die and the lower die relative to the hole flanging positioning pin; and the hole flanging positioning pin is matched with the special-shaped hole in an inserting manner. The hole flanging positioning pin and the special-shaped hole can be matched in an inserted mode and jointly act on a pre-punched hole in a plate, so that flanging stress generated when the pre-punched hole forms a flanging can be released at the notch position of the special-shaped hole, and the plate clamping phenomenon is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts processing technology, and in particular to a hole-flipping positioning mold. Background Technology

[0002] With the widespread application of thermoforming technology in the field of vehicle parts, vehicle parts with flanging structures need to be positioned and flanged using specific structures on the mold.

[0003] In the existing technology, a locating pin that integrates a locating pin and a locating pin is used to position and locate the sheet metal. First, the locating section of the locating pin is used to align with the hole to be processed on the sheet metal for positioning. Then, the locating section of the locating pin is used to fold the hole to be processed.

[0004] However, the mold has a circular relief hole at the position corresponding to the locating pin. During the mold closing process, the circular relief hole makes it impossible for the stress of the flange of the hole to be processed to be released. As a result, the gap between the flange of the hole to be processed and the locating pin is tight, making it difficult for the sheet to be removed from the locating pin. This makes the material removal process time-consuming and labor-intensive, increasing production costs. Utility Model Content

[0005] The main purpose of this utility model is to propose a flip-hole positioning mold, which aims to solve the technical problem that the sheet metal is difficult to detach from the flip-hole positioning pin.

[0006] To achieve the above objectives, this utility model proposes a hole-flipping positioning mold, comprising an upper mold and a lower mold arranged opposite to each other, a hole-flipping positioning pin disposed on one of the upper mold and the lower mold, and an irregular hole disposed on the other of the upper mold and the lower mold opposite to the hole-flipping positioning pin, wherein the hole-flipping positioning pin and the irregular hole form an insertion fit.

[0007] In some embodiments, the irregular hole is formed by a combination of a circular main hole and at least three fan-shaped secondary holes, wherein the fan-shaped secondary holes are evenly distributed on the outer periphery of the circular main hole, and the arc-shaped edges of the fan-shaped secondary holes are smoothly connected to the edges of the circular main hole.

[0008] In some embodiments, the radius of the circular main hole is 6-8 mm, the radius of the fan-shaped secondary hole is 2-3 mm, and the center of the fan-shaped secondary hole is located on the virtual circle of the circular main hole.

[0009] In some embodiments, the flip-hole positioning pin is provided on the upper mold, the irregular hole is provided on the lower mold, one end of the flip-hole positioning pin is provided with a guide portion, the other end of the flip-hole positioning pin is provided with a fixing portion, the fixing portion is used to connect with the upper mold, and the guide portion is tapered.

[0010] In some embodiments, the locating pin with the flipped hole is further provided with a locating section and a flipped hole section between the guide portion and the fixing portion, wherein the radius of the locating section is smaller than the radius of the flipped hole section.

[0011] In some embodiments, the length of the positioning segment is 4 to 6 mm.

[0012] In some embodiments, the flipping section further includes a cylindrical flipping straight section and a tapered flipping conical section, the tapered section being located between the positioning section and the flipping straight section.

[0013] In some embodiments, the length of the taper section is 5 to 7 mm.

[0014] The flanging positioning mold proposed in this application sets a flanging positioning pin on one of the upper or lower molds and sets an irregular hole on the other. The flanging positioning pin and the irregular hole can be inserted and matched with each other, and work together on the pre-punching hole on the sheet metal. This allows the flanging stress generated when the pre-punching hole forms a flanging edge to be released at the notch of the irregular hole, avoiding the sheet metal from being too tightly fitted with the flanging positioning pin, thereby reducing the phenomenon of sheet metal jamming, ensuring the stability of the production material handling process, and improving production quality and efficiency. Attached Figure Description

[0015] Figure 1 This is a partial schematic diagram of an embodiment of the hole-flipping positioning mold of this utility model;

[0016] Figure 2 This is a schematic diagram of an irregular hole in an embodiment of the hole-flipping positioning mold of this utility model;

[0017] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0018] Figure 4 This is a schematic diagram of the hole-flipping positioning pin structure of an embodiment of the hole-flipping positioning mold of this utility model.

[0019] In the attached diagram: 1-flipping positioning pin; 2-irregular hole; 21-circular main hole; 22-fan-shaped secondary hole; 11-guide section; 12-positioning section; 13-flipping section; 131-flipping straight section; 132-flipping conical section; 3-plate material. Detailed Implementation

[0020] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0023] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] Reference Figure 1 and Figure 2 As shown, this application proposes a hole-flipping positioning mold, including an upper mold and a lower mold arranged opposite to each other, a hole-flipping positioning pin 1, which is provided on one of the upper mold and the lower mold; and an irregular hole 2, which is provided on the other of the upper mold and the lower mold opposite to the hole-flipping positioning pin 1; the hole-flipping positioning pin 1 and the irregular hole 2 form an insertion fit.

[0025] In this embodiment, the upper and lower molds are arranged correspondingly, with a forming cavity between them for stamping the sheet metal 3 into the desired part. Typically, one of the upper and lower molds is a punch, and the other a die. The die corresponds to the punch, and its shape determines the outer surface shape of the part. The sheet metal 3 undergoes plastic deformation between the punch and the die. The locating pin 1 is typically a stepped cylindrical structure, fixed to the upper or lower mold by bolts or locating pins. During stamping, the locating pin 1 inserts into the pre-punched hole of the sheet metal 3, accurately defining the position of the sheet metal 3 in the mold. This constrains and guides the forming process of the locating hole in the subsequent locating process, preventing excessive offset and ensuring the quality of the locating hole. The irregular hole 2 forms an interlocking fit with the locating pin 1. During mold closing, the irregular hole 2 provides guidance for the locating pin 1, allowing it to be accurately inserted, thereby guiding the upper and lower molds to close correctly and preventing damage to the mold or part due to misalignment. Meanwhile, the irregular hole 2 allows stress at the hole location to be released at the notch or irregular structure, reducing the occurrence of material jamming. The shape of the irregular hole 2 can be a circular hole with added triangular, rectangular, or trapezoidal notches, evenly distributed around the perimeter of the circular hole. The irregular hole 2 can also be irregularly shaped such as wavy or elliptical. The irregular hole 2 changes the stress concentration of the flange, allowing the sheet metal 3 to be more easily removed from the mold after stamping, reducing the number of ejector pins, saving production costs, and improving production efficiency.

[0026] Reference Figure 2 and Figure 3 As shown, in some embodiments, the irregular hole 2 is formed by combining a circular main hole 21 and at least three fan-shaped secondary holes 22. The fan-shaped secondary holes 22 are evenly distributed on the outer periphery of the circular main hole 21, and the arc-shaped edges of the fan-shaped secondary holes 22 are smoothly connected to the edges of the circular main hole 21.

[0027] In this embodiment, the circular main hole 21 is the basic part of the irregular hole 2, and cooperates with the flip-hole positioning pin 1 to achieve the positioning function. Obviously, the diameter of the circular main hole 21 is larger than the diameter of the flip-hole positioning pin 1, and the difference between the two diameters is between 0.05 and 0.2 mm, ensuring that the flip-hole positioning pin 1 can be inserted while maintaining positioning accuracy. At least three fan-shaped secondary holes 22 are evenly distributed on the outer periphery of the circular main hole 21, symmetrically arranged around the center of the circular main hole 21. The central angle of the fan-shaped secondary holes 22 is between 45 degrees and 90 degrees, and the radius is one-quarter to one-third of the radius of the circular main hole 21. The arc-shaped edges of each fan-shaped secondary hole 22 are smoothly connected to the edge of the circular main hole 21 to avoid stress concentration at the connection point. During the stamping process, the flip-hole positioning pin 1 is inserted into the circular main hole 21 to achieve the positioning function. During the flanging process, due to the presence of the fan-shaped secondary hole 22, the stress between the flanging positioning pin 1 of the sheet 3 will be redistributed along the edge of the fan-shaped secondary hole 22, so that the stress can be effectively released at the fan-shaped secondary hole 22, reducing the friction and clamping force between the sheet 3 and the flanging positioning pin 1, so that the sheet 3 can easily detach from the flanging positioning pin 1 and avoid the jamming phenomenon.

[0028] In some embodiments, the radius of the circular main hole 21 is 6-8 mm, the radius of the fan-shaped secondary hole 22 is 2-3 mm, and the center of the fan-shaped secondary hole 22 is located on the virtual circle of the circular main hole 21.

[0029] In this embodiment, the radius of the circular main hole 21 is 6-8 mm, which ensures the stability of the locating pin 1 during insertion and allows for reasonable positioning within the mold space, avoiding the impact of excessively large hole diameter on mold strength or the difficulty in inserting the locating pin 1 due to excessively small hole diameter. The radius of the fan-shaped secondary hole 22 is 2-3 mm. The smaller radius effectively breaks the stress ring of the circular hole, guiding the stress to the notch for release, without affecting the positioning function of the circular main hole 21. The center of the fan-shaped secondary hole 22 is located on the virtual circle of the circular main hole 21, ensuring that the fan-shaped secondary holes 22 are evenly distributed around the main hole. When forming the irregular hole 2, a circular main hole 21 is first opened, and based on the circular main hole 21, the center of the fan-shaped secondary hole 22 is set on the edge of the hole. The fan-shaped secondary hole 22 is opened outside the circular main hole 21. At this time, the edge of the circular main hole 21 is replaced by the fan-shaped secondary hole 22. The arc side of the fan-shaped secondary hole 22 is smoothly connected to the edge of the adjacent circular main hole 21, thus completing the opening of the irregular hole 2.

[0030] Reference Figure 4 As shown, in some embodiments, the flip-hole positioning pin 1 is provided on the upper mold, the irregular hole 2 is provided on the lower mold, one end of the flip-hole positioning pin 1 is provided with a guide part 11, and the other end of the flip-hole positioning pin 1 is provided with a fixing part. The fixing part is used to connect with the upper mold, and the guide part 11 is conical.

[0031] In this embodiment, the flip-hole positioning pin 1 is located in the upper mold, and the irregular hole 2 is located in the lower mold. One end of the flip-hole positioning pin 1 is provided with a guide portion 11, which is tapered in design. The diameter of its tip is smaller than the diameter of the end connected to the fixing portion. During the mold closing process, the structure of the guide portion 11 can quickly and accurately guide the flip-hole positioning pin 1 into the irregular hole 2 of the lower mold. Even if there is a slight deviation in the placement of the sheet metal 3, the tapered guide portion 11 can still guide the flip-hole positioning pin 1 smoothly into the irregular hole 2 through its own guiding action, reducing the collision and wear between the flip-hole positioning pin 1 and the edge of the irregular hole 2, and extending the service life of the mold. The other end of the flip-hole positioning pin 1 is provided with a fixing portion for connecting to the upper mold. It can be designed as a threaded hole or mounting groove, etc., and the flip-hole positioning pin 1 is securely installed on the upper mold by bolts, pins, and other connecting parts.

[0032] Reference Figure 4 As shown, in some embodiments, the locating pin 1 is further provided with a locating section 12 and a locating section 13 between the guide section 11 and the fixing section, and the radius of the locating section 12 is smaller than the radius of the locating section 13.

[0033] In this embodiment, the positioning segment 12 functions as the positioning section for the sheet metal 3. During the mold closing process, the positioning segment 12 first inserts into the pre-punched hole of the sheet metal 3 and the irregular hole 2 of the lower mold, thereby determining the position of the sheet metal 3 in the mold and providing a reliable positioning basis for subsequent stamping processes. The radius of the flanging segment 13 is larger than that of the positioning segment 12. After the positioning segment 12 completes its positioning, as the upper mold continues to descend, the flanging segment 13 gradually applies pressure to the sheet metal 3, causing the sheet metal 3 to undergo plastic deformation under the action of the flanging segment 13, forming the required flanging structure. During the formation of the flanging structure, the irregular hole 2 located below the pre-punched hole and the flanging positioning pin 1 work together to flanging the pre-punched hole. The fan-shaped secondary hole 22 in the irregular hole 2 releases the flanging stress generated during the flanging process, preventing the flanging of the pre-punched hole from being clamped by the flanging positioning pin 1 and the circular main hole 21 in the irregular hole 2, which would cause difficulties in material removal.

[0034] In some embodiments, the length of the positioning segment 12 is 4 to 6 mm.

[0035] In this embodiment, the length of the positioning segment 12 is 4 to 6 mm. For example, the length of the positioning segment 12 is twice the thickness of the sheet material 3 to be processed, so as to ensure that it has a certain guiding function. Preferably, the length of the positioning segment 12 is 5 mm.

[0036] In some embodiments, the flipping section 13 further includes a cylindrical flipping straight section 131 and a tapered flipping conical section 132, with the tapered section 132 located between the positioning section 12 and the flipping straight section 131.

[0037] In this embodiment, when the flanging positioning pin 1 is in operation, it is first fixed to the upper mold with screws. Then, the positioning section 12 of the flanging positioning pin 1 is inserted into the pre-punched hole of the sheet metal 3 to be processed, thereby positioning the sheet metal 3. Then, the sheet metal 3 is subjected to a forming process. During the mold closing process, under the extrusion of the mold, the flanging section 13 will be embedded in the pre-punched hole, flanging the pre-punched hole on the sheet metal 3 to process the hole into a corresponding straight hole or tapered hole, etc. Since the diameter of the flanging section 13 is larger than the diameter of the positioning section 12, the flanging section 13 enlarges the pre-punched hole on the sheet metal 3, and the enlarged pre-punched hole can be used as a positioning hole for subsequent laser cutting.

[0038] Meanwhile, during use, the hole formed will vary depending on the installation height of the flip-hole positioning pin 1. When the straight section 131 of the flip-hole positioning pin 1 is higher than the product surface, the hole formed by the flip-hole positioning pin 1 is a straight hole; when the straight section 131 of the flip-hole positioning pin 1 is lower than the product surface, while the tapered section 132 of the flip-hole is higher than the product surface, the hole formed by the flip-hole positioning pin 1 is an oblique hole.

[0039] In one embodiment, the length of the taper section 132 is 5-7 mm.

[0040] In this embodiment, the length of the flipping cone section 132 needs to be greater than the thickness of the sheet metal 3 so that the flipping cone section 132 can fully act on the pre-punching hole of the sheet metal 3 during the mold closing process.

[0041] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A hole-flipping positioning mold, comprising an upper mold and a lower mold arranged opposite to each other, characterized in that, include: A locating pin with a flip-hole is provided on one of the upper mold and the lower mold; The irregular hole is positioned relative to the flip-hole positioning pin on the other of the upper mold and the lower mold; The locating pin with the flipped hole forms an insertion fit with the irregular hole.

2. The hole-flipping positioning mold according to claim 1, characterized in that, The irregular hole is formed by combining a circular main hole and at least three fan-shaped secondary holes. The fan-shaped secondary holes are evenly distributed on the outer periphery of the circular main hole, and the arc-shaped edges of the fan-shaped secondary holes are smoothly connected to the edges of the circular main hole.

3. The hole-flipping positioning mold according to claim 2, characterized in that, The radius of the circular main hole is 6-8 mm, the radius of the fan-shaped secondary hole is 2-3 mm, and the center of the fan-shaped secondary hole is located on the virtual circle of the circular main hole.

4. The flanging positioning mold according to any one of claims 1 to 3, characterized in that, The flip-hole positioning pin is provided on the upper mold, the irregular hole is provided on the lower mold, one end of the flip-hole positioning pin is provided with a guide part, and the other end of the flip-hole positioning pin is provided with a fixing part. The fixing part is used to connect with the upper mold, and the guide part is conical.

5. The hole-flipping positioning mold according to claim 4, characterized in that, The locating pin with a flip-hole is further provided with a locating section and a flip-hole section between the guide part and the fixing part, and the radius of the locating section is smaller than the radius of the flip-hole section.

6. The hole-flipping positioning mold according to claim 5, characterized in that, The length of the positioning segment is 4 to 6 mm.

7. The hole-flipping positioning mold according to claim 5, characterized in that, The flipping section further includes a cylindrical flipping straight section and a tapered flipping conical section, with the tapered section located between the positioning section and the flipping straight section.

8. The hole-flipping positioning mold according to claim 7, characterized in that, The length of the taper section is 5-7 mm.

Images