Die insert positioning structure

Abstract

The utility model relates to the field of stamping dies, and particularly discloses a die insert positioning structure. Comprising an insert, a fixing hole is eccentrically formed in the insert, the side wall, away from the fixing hole, of the insert is a stress face, the stress face is located between the adjacent side walls of the mold, the end, provided with the fixing hole, of the insert is a limiting face, the limiting face is opposite to the stress face, and the width of the limiting face is larger than that of the stress face. The mold insert positioning structure solves the problems that the size of the insert is large, and replacement operation is complex.

Description

Technical Field

[0001] This utility model relates to the field of stamping dies, and specifically to a die insert positioning structure. Background Technology

[0002] Stamping is a forming process that uses a press and dies to apply external force to sheet metal, strip, tube, and profiles, causing plastic deformation or separation to obtain workpieces of the desired shape and size. Because the press applies significant external force to the raw material during stamping, the dies require high strength. However, due to the shape and size requirements of the workpieces to be formed, the strength of locations such as corners between adjacent sidewalls of the die is relatively low, making them more prone to damage compared to stronger locations. Once a die is damaged, it cannot be used again. To reduce the cost of die replacement, the traditional method is to install inserts at these locations. Even if the insert is damaged during processing, it can be removed from the die, allowing for die reuse by simply replacing the insert.

[0003] Currently, in insert-type stamping dies, inserts are typically bolted to the die during installation. Precise positioning is then achieved through locating pins that engage with pin holes on the insert. This requires both pin holes and threaded holes on the insert, necessitating a relatively large insert size to accommodate these spaces. Furthermore, when the stamping pressure is high, causing significant insert deformation, the locating pins are prone to deformation, making removal difficult. This compromises the interchangeability of the inserts and necessitates additional secondary adjustments.

[0004] Later, a type of insert-type cold stamping and drawing die for thin metal sheets appeared, as disclosed in patent number CN202725782U. It includes a pressure plate, a drawing bead, and a die that matches the cross-sectional shape of the drawing bead. It also includes a wedge block that matches the inclined surface of the drawing bead and is placed together in the groove of the pressure plate. The wedge block and the pressure plate are connected by bolts.

[0005] Although the aforementioned wedge block eliminates the pin hole and is only connected to the mold by bolts, the wedge block is not positioned before the bolt connection. In actual implementation, before the wedge block is placed in the installation position and fixed with bolts, the wedge block is prone to displacement, making it inconvenient to install the bolts. Utility Model Content

[0006] The present invention aims to provide a mold insert positioning structure to solve the problems of large insert size and complicated replacement operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a mold insert positioning structure, including an insert, an eccentrically provided fixing hole on the insert, the side wall of the insert away from the fixing hole is a force-bearing surface, the force-bearing surface is located between adjacent side walls of the mold, the end of the insert with the fixing hole is a limiting surface, the limiting surface is opposite to the force-bearing surface, and the width of the limiting surface is greater than the width of the force-bearing surface.

[0008] The beneficial effects of this plan are:

[0009] In this design, the insert is installed on the outer wall of the mold, located at the corner of the mold sidewall. Supported by the corner and adjacent sidewalls, it effectively prevents deformation. Secondly, before installation, a locating groove is created on the mold, its shape matching the cross-section of the insert's end near the locating surface. During installation, the end of the insert near the locating surface is placed in the locating groove. Since the width of the locating surface is greater than the width of the bearing surface, the width of the opening of the locating groove is smaller than the width of the bottom. The insert cannot slide laterally after being placed in the locating groove, thus it can be self-positioned without the need for locating pins or other positioning structures. Only bolts are needed to lock the insert to the mold. When the insert needs to be replaced, the bolts are removed, and the insert can be removed upwards from the locating groove. Installation and disassembly are simple. Furthermore, because the insert's shape itself allows for positioning with the mold, locating pins are no longer needed, and there is no need to machine pin holes on the insert to mate with locating pins. Therefore, the insert size can be smaller, reducing mold weight and insert cost. Furthermore, the bottom of the insert has an inclined surface that is higher on the side closer to the force-bearing surface than on the side closer to the limiting surface.

[0010] The beneficial effects of this solution are: after the inclined surface at the bottom of the insert matches the inclined surface on the mold, the wedge-shaped fit between the two inclined surfaces makes it less likely for the insert to slip out of the mold, and the self-positioning effect of the insert is better.

[0011] Furthermore, the force-bearing surface includes an arc-shaped portion that protrudes outward from the insert.

[0012] The beneficial effects of this solution are: while the arc-shaped part conforms to the shape of the workpiece, it can also further increase the strength of the side of the insert closer to the force-bearing surface.

[0013] Furthermore, the two sides of the stress-bearing surface are transition sections that smoothly transition with the adjacent mold sides.

[0014] Furthermore, the insert has a blanking hole along the thickness direction of the insert, and the minimum vertical distance between the blanking hole and the force-bearing surface is greater than or equal to 40mm.

[0015] The beneficial effects of this solution are as follows: when it is necessary to punch through holes in the workpiece, the blanking hole in this solution is opposite to the through hole on the workpiece and provides a material feeding channel for the forming of the through hole. The distance between the blanking hole and the stress surface ensures that the part of the insert maintains high strength and has a longer service life.

[0016] Furthermore, the material discharge hole includes a first section and a second section, with the second section located below the first section, and the diameter of the second section being greater than or equal to the diameter of the circumcircle of the first section.

[0017] The beneficial effects of this solution are: the larger diameter of the second section makes it easier for the stamping debris to fall out, so that the debris will not clog the discharge hole.

[0018] Furthermore, a third segment is provided between the first segment and the second segment. The cross-sectional shape of the third segment is the same as that of the first segment, and any sidewall of the third segment is opposite to the opposite sidewall of the first segment by an outward expansion of 1.5 to 2 mm. The diameter of the circumcircle of the third segment is smaller than that of the second segment.

[0019] The beneficial effects of this solution are as follows: the diameter of the circumscribed circle of the third segment is larger than the diameter of the circumscribed circle of the second segment, and the first, second and third segments are coaxial. The third segment can provide better support for the first segment, so that the first segment will not deform during stamping.

[0020] Furthermore, the force-bearing surface includes an upper side and a lower side, the upper side being located above the lower side, and the vertical projection of the lower side being located inside the upper side, the accuracy of the upper side being greater than the accuracy of the lower side.

[0021] The beneficial effects of this solution are as follows: During the stamping process, the stress-bearing surface is divided into an upper and lower plane, allowing the upper plane to be precision-machined and heat-treated separately, resulting in greater strength or higher precision. When the stress-bearing surface acts as the plane that mates with the punch and causes the workpiece to fracture at the point opposite the stress-bearing surface, the higher precision of the upper side in this solution results in fewer burrs on the workpiece during stamping, effectively improving stamping quality. Furthermore, compared to precision-machined and heat-treated entire stress-bearing surfaces, precision-machined and heat-treated only the upper side is less costly, effectively reducing workpiece processing costs. Attached Figure Description

[0022] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 The right view;

[0024] Figure 3 for Figure 1 Top view;

[0025] Figure 4 for Figure 1 A three-dimensional view viewed from below;

[0026] Figure 5 This is a schematic diagram of the mounting of the insert in an embodiment of this utility model. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The reference numerals in the accompanying drawings include: insert 1, fixing hole 11, limiting surface 12, blanking hole 2, first section 21, second section 22, third section 23, force-bearing surface 3, arc-shaped part 31, transition part 32, and mold 4.

[0029] Example

[0030] The implementation examples are basically as follows Figure 1 As shown, a mold insert positioning structure includes an insert 1. A fixing hole 11 is eccentrically located at the right end of the insert 1, penetrating vertically through the insert 1. In this embodiment, the fixing hole 11 is a stepped hole: the upper part of the fixing hole 11 is a clearance hole, and the lower part is a threaded hole with a diameter smaller than the upper part. When the insert 1 needs to be disassembled, with the bolt threadedly connected to the fixing hole 11, the insert 1 can be quickly removed by pulling the bolt. Therefore, the fixing hole 11 in this solution also functions as a pull-out hole. The rear sidewall of the insert 1 is a limiting surface 12, and the front sidewall is a force-bearing surface 3. The width of the limiting surface 12 is greater than the width of the force-bearing surface 3.

[0031] Combination Figure 2 As shown, the height of the end of the insert 1 near the force-bearing surface 3 is less than the height of the end near the limiting surface 12, making the bottom of the insert 1 an inclined surface with the left end higher than the right end. When the insert 1 in this solution is used, an inclined surface that cooperates with the inclined surface is set at the corresponding position of the mold 4. Specifically, the inclined surface is also with the left end higher than the right end. At this time, the inclined surface and the inclined surface cooperate to limit the insert 1 and prevent the insert 1 from coming off the mold 4.

[0032] For example Figure 1 and Figure 3 As shown, the left side of the stress-bearing surface 3 has an arc-shaped portion 31 that protrudes outward from the insert 1, increasing the strength of the insert 1. Both ends of the stress-bearing surface 3 have transition portions 32, which allow the stress-bearing surface 3 to smoothly transition to the side wall of the mold 4. Furthermore, in this embodiment, the stress-bearing surface 3 can be further divided into an upper side and a lower side. The upper side is higher than the lower side and protrudes forward, forming a step between the upper and lower sides. In this embodiment, the machining accuracy of the upper side is greater than that of the lower side. In actual implementation, the upper side can also be heat-treated to simultaneously improve its strength.

[0033] The insert 1 has a material drop hole 2 at one end near the force-bearing surface 3, and the minimum vertical distance between the material drop hole 2 and the force-bearing surface 3 is 40mm. Figure 4 As shown, the material discharge hole 2 in this embodiment includes a second segment 22, a third segment 23 and a first segment 21 distributed from bottom to top. The cross-section of the second segment 22 is circular, and the cross-sections of the second segment 22 and the third segment 23 are triangular. The side length of the third segment 23 is greater than the side length of the first segment 21, and the diameter of the second segment 22 is greater than the diameter of the circumcircle of the third segment 23, so that steps are formed between the first segment 21 and the third segment 23, as well as between the third segment 23 and the second segment 22.

[0034] Combination Figure 5 As shown, in this embodiment, the insert 1 is installed from top to bottom into the limiting groove on the mold 4. The inclined surface at the bottom of the insert 1 abuts against the inclined surface at the bottom of the limiting groove. Through the cooperation of the inclined surfaces and the design that the opening width of the limiting groove is greater than the width of the side wall opposite the opening, the insert 1 can be automatically positioned without the need for positioning pins. Finally, the insert 1 is locked to the mold 4 with bolts. At this time, the force-bearing surface 3 is located between the adjacent side walls of the mold 4, and the limiting surface 12 abuts against the mold 4, providing support for the mold 4.

[0035] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A mold insert positioning structure, comprising an insert, characterized in that: The insert has an eccentric fixing hole. The side wall of the insert away from the fixing hole is the force-bearing surface. The force-bearing surface is located between adjacent side walls of the mold. The end of the insert with the fixing hole is a limiting surface. The limiting surface is opposite to the force-bearing surface, and the width of the limiting surface is greater than the width of the force-bearing surface.

2. The mold insert positioning structure according to claim 1, characterized in that: The bottom of the insert has an inclined surface that is higher on the side closer to the force-bearing surface than on the side closer to the limiting surface.

3. The mold insert positioning structure according to claim 1, characterized in that: The force-bearing surface includes an arc-shaped portion that protrudes outward from the insert.

4. The mold insert positioning structure according to claim 3, characterized in that: The two sides of the stress-bearing surface are transition sections that smoothly transition with the adjacent mold sides.

5. The mold insert positioning structure according to claim 1, characterized in that: The insert has a material drop hole along its thickness direction, and the minimum vertical distance between the material drop hole and the force-bearing surface is greater than or equal to 40 mm.

6. The mold insert positioning structure according to claim 5, characterized in that: The material discharge hole includes a first section and a second section. The second section is located below the first section, and the diameter of the second section is greater than or equal to the diameter of the circumcircle of the first section.

7. A mold insert positioning structure according to claim 6, characterized in that: A third segment is provided between the first and second segments. The cross-sectional shape of the third segment is the same as that of the first segment. Any sidewall of the third segment is opposite to the opposite sidewall of the first segment by an outward expansion of 1.5 to 2 mm. The diameter of the circumcircle of the third segment is smaller than that of the second segment.

8. The mold insert positioning structure according to claim 1, characterized in that: The force-bearing surface includes an upper side and a lower side. The upper side is located above the lower side, and the vertical projection of the lower side is located inside the upper side. The accuracy of the upper side is greater than that of the lower side.

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