Extrusion die capable of preventing narrow edge from bending and deflecting

Abstract

The utility model relates to an extrusion die capable of preventing a narrow edge from bending and deflecting. The extrusion die comprises an upper die base, an upper padding plate, an upper clamping plate and a stopping plate. The bending die comprises an upper clamping plate, a stripper plate, a lower die plate, a lower cushion plate and a lower die base, first bending punches are symmetrically installed at the left end and the right end of the upper clamping plate, and second bending punches matched with a product to be bent for bending are installed on the inner sides of the first bending punches; a bending insert is arranged in the middle of the lower die plate, a bending limiting insert is installed on the outer side of the bending insert, and an avoiding groove is formed in the side, facing the bending insert, of the bending limiting insert. A stripping ejector rod used for ejecting a bent product is arranged in the lower base plate and arranged on the inner side of the lower base plate in an elastic lifting mode. By means of the structure, the whole bending process can be limited, the bending shape of a product is effectively limited, the bending position is prevented from protruding outwards, the appearance precision of the product is improved, and the phenomenon of bending deflection caused by uneven bending stress due to uneven burrs and shape distortion in the blanking process is avoided.

Description

Technical Field

[0001] The invention relates to the field of mold processing and production equipment, and in particular to an extrusion mold capable of preventing narrow side bending and deflection. Background Art

[0002] The copper buckle tabs on many inductors currently on the market require a width-to-thickness ratio of 1.2 or less. Previous experience in producing square pins indicates that these products can deflect after bending, resulting in bulging at the bend. This deflection requires multiple adjustments to the mold tube position, requiring high-level repair skills and a lengthy repair process. Furthermore, when the product's external tolerance band is required to be less than 30% of the material thickness, the external dimensions of the bend cannot meet the tolerance requirements.

[0003] Since current processing cannot meet the requirements of production efficiency while avoiding bulging, denting, and material accumulation, it is necessary to improve and optimize the existing bending structure. To this end, we propose an extrusion die that prevents narrow-edge bending deflection to solve the above problems. Summary of the Invention

[0004] (1) Technical problems to be solved

[0005] The present invention addresses the above-mentioned problems in the prior art and, in order to remedy the deficiencies of the prior art, provides an extrusion die capable of preventing narrow side bending and deflection that can be reasonably manufactured and used.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides an extrusion die for preventing narrow-side bending and deflection, comprising an upper die base and a lower die base, wherein an upper pad, an upper clamping plate, and a stop plate are sequentially provided below the upper die base; a stripper plate, a lower template, and a lower pad are sequentially provided on the upper end of the lower die base from top to bottom, and a first bending punch is symmetrically installed at the left and right ends of the upper clamping plate, and a second bending punch is installed on the inner side of the first bending punch to match the product before bending;

[0008] A bending insert is provided in the middle of the lower template, a bending limit insert is installed on the outer side of the bending insert, and an avoidance groove is provided on the side of the bending limit insert facing the bending insert to facilitate the downward bending of the product before bending;

[0009] A stripping ejector rod for ejecting the bent product is provided in the lower pad, and the stripping ejector rod is elastically lifted and lowered and arranged on the inner side of the lower pad.

[0010] Preferably, the first bending punch and the second bending punch are fixed by a fixing pin.

[0011] Preferably, the bending insert and the bending limiting insert are limited by limiting pins, and there are two bending limiting inserts, which are symmetrically arranged on the left and right sides of the bending insert.

[0012] Preferably, the two downward ends of the first bending punch are arranged with arc-shaped chamfers, and the inner side of the second bending punch is arranged with an arc-shaped chamfered protrusion inclined upward.

[0013] Preferably, the bending limit insert is defined within the lower template, and the highest point of the bending limit insert is flush with the highest point of the bending insert.

[0014] Preferably, the ends of the first bending punch and the second bending punch protrude downward from the stripper plate.

[0015] Preferably, the top of the bent insert is an inverted U-shaped protrusion.

[0016] Preferably, the stripping ejector rod is pushed by a stripping spring, the stripping spring is arranged on the inner side of the lower die base, and the top end of the stripping spring is directly connected to the bottom end of the stripping ejector rod.

[0017] (3) Beneficial effects

[0018] The present invention overcomes the shortcomings of the prior art in which narrow-edged products are prone to deflection during the bending process, the material bulges outward within the bending range, and the contact area of ​​the bending punch edge is prone to dents and material accumulation during processing. The present invention has the following advantages:

[0019] 1. Since the structure of this solution can limit the entire bending process, it effectively limits the bending shape of the product to avoid bulging at the bend, and the product's shape accuracy can be greatly improved to ±0.05.

[0020] 2. Since the structure in this solution can limit the entire bending process, it can avoid the phenomenon of bending deflection caused by uneven bending force due to uneven burrs and distorted shapes in the blanking process;

[0021] 3. The structure of this solution can make the bending force of the product uniform and avoid the phenomenon of dents and piles where the bending punch contacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the overall structure of the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A.

[0024] The accompanying drawings are marked as: 1-upper die base, 2-upper pad, 3-upper splint, 4-stop plate, 5-stripping plate, 6-lower template, 7-lower pad, 8-lower die base, 9-first bending punch, 10-fixing pin, 11-second bending punch, 12-bending insert, 13-limiting pin, 14 bending limiting insert, 15 stripping ejector rod, 16 stripping spring, 18 product before bending, 19 product after bending. DETAILED DESCRIPTION

[0025] The present invention will be further described with reference to the accompanying drawings and embodiments.

[0026] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, 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 should not be understood as a limitation on the present invention.

[0027] like Figure 1-2 As shown, the present invention provides an embodiment of an extrusion die for preventing narrow side bending and deflection, comprising an upper die base 1 and a lower die base 8, wherein an upper pad 2, an upper clamping plate 3, and a stop plate 4 are sequentially arranged below the upper die base 1; a stripper plate 5, a lower template 6, and a lower pad 7 are sequentially arranged on the upper end of the lower die base 8 from top to bottom, and the feature is that a first bending punch 9 is symmetrically installed at the left and right ends of the upper clamping plate 3, and a second bending punch 9 is installed on the inner side of the first bending punch 9 for matching the product 18 before bending. Bending punch 11, the first bending punch 9 and the second bending punch 11 are fixed by a fixing pin 10. Specifically, in order to achieve the bending effect, the downward ends of the first bending punch 9 are set with arc chamfers, and the inner side of the second bending punch 11 is set with an oblique upward arc chamfer protrusion. In order to facilitate product bending, the ends of the first bending punch 9 and the second bending punch 13 protrude downward from the stripper plate 5, and the top of the bending insert 12 is an inverted U-shaped top protrusion setting, which is convenient for matching product bending;

[0028] A bending insert 12 is provided in the middle of the lower template 6, and a bending limit insert 14 is installed on the outside of the bending insert 12. The bending insert 12 and the bending limit insert 14 are limited by a limit pin 13. There are two bending limit inserts 14, and the two bending limit inserts 14 are symmetrically arranged on the left and right sides of the bending insert 12. The bending limit insert 14 is provided with an avoidance groove on the side facing the bending insert 12 to facilitate bending and making way for the product. The bending limit insert 14 is confined in the lower template 6, and the highest point of the bending limit insert 14 is flush with the highest point of the bending insert 12;

[0029] The lower pad 7 is provided with a stripping push rod 15 for ejecting the product 19 after bending. The stripping push rod 15 is elastically raised and lowered and arranged on the inner side of the lower pad 7. Specifically, the stripping push rod 15 is pushed by a stripping spring 16. The stripping spring 16 is arranged on the inner side of the lower die base 8. The top of the stripping spring 16 is directly connected to the bottom of the stripping push rod 15 and is pressed down during the bending process. After the bending is completed, the stripping spring 16 automatically resets and pushes the stripping push rod 15 upward to facilitate discharging and prevent piling.

[0030] In actual use, the product is made of semi-hard copper, with a thickness of 2.0mm and a width of only 1.90mm. There are grooves 0.8mm wide and 0.2mm deep on both sides of the product. When bending with the punch structure before the improvement, the product's force-bearing width is only 1.1mm, resulting in insufficient product strength and depression by the punch. The material is easily pushed to the front of the punch, which is prone to pile-up. The improved punch adds a second bending punch to the original first bending punch, and matches it with a bending insert and a bending limit insert. This allows the product groove to also bear force during bending, and the product's force-bearing width reaches 1.90mm, improving product strength and avoiding depression and pile-up at the bend.

[0031] Bending limit blocks are added to the periphery of the bending insert. Before bending, all parts of the product that need to be bent have been placed inside the bending insert. During the bending process, the material bulging at the bending part of the product can be limited, and the shape of the bending part can be shaped to prevent bending deflection.

[0032] After bending, there is extrusion pressure between the bending limit insert and the product. In order to avoid difficulty in removing the product, a stripping ejector rod and a spring are set under the bending insert. When the mold is opened, the bending insert is pushed to eject the product out of the bending limit block.

[0033] The above examples merely represent preferred embodiments of the present invention, and their descriptions are relatively specific and detailed. However, the present invention is not limited to these examples. It should be noted that it is within the skill of a person skilled in the art. Any improvements made without departing from the spirit of the present invention are within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the appended claims.

Claims

1. An extrusion die for preventing narrow side bending and deflection, comprising an upper die base and a lower die base, wherein an upper pad, an upper clamping plate, and a stop plate are sequentially provided below the upper die base; and a stripper plate, a lower mold plate, and a lower pad are sequentially provided at the upper end of the lower die base from top to bottom, characterized in that: The left and right ends of the upper clamping plate are symmetrically mounted with first bending punches, and the inner side of the first bending punch is mounted with a second bending punch that matches the product before bending; A bending insert is provided in the middle of the lower template, a bending limit insert is installed on the outer side of the bending insert, and an avoidance groove is provided on the side of the bending limit insert facing the bending insert; A stripping ejector rod for ejecting the bent product is provided in the lower pad, and the stripping ejector rod is elastically lifted and lowered and arranged on the inner side of the lower pad.

2. The extrusion die for preventing narrow side bending and deflection according to claim 1, characterized in that: The first bending punch and the second bending punch are fixed by a fixing pin.

3. The extrusion die for preventing narrow side bending and deflection according to claim 1, characterized in that: The bending insert and the bending limiting insert are limited by limiting pins. There are two bending limiting inserts, and the two bending limiting inserts are symmetrically arranged on the left and right sides of the bending insert.

4. The extrusion die for preventing narrow side bending and deflection according to claim 3, characterized in that: The two downward ends of the first bending punch are arranged with arc-shaped chamfers, and the inner side of the second bending punch is arranged with an arc-shaped chamfered protrusion inclined upward.

5. The extrusion die for preventing narrow side bending and deflection according to claim 1, characterized in that: The bending limit insert is defined in the lower template, and the highest point of the bending limit insert is flush with the highest point of the bending insert.

6. The extrusion die for preventing narrow side bending and deflection according to claim 1, characterized in that: The ends of the first bending punch and the second bending punch protrude downward from the stripping plate.

7. The extrusion die for preventing narrow side bending and deflection according to claim 1, characterized in that: The top of the bent insert is an inverted U-shaped protrusion.

8. The extrusion die for preventing narrow side bending and deflection according to any one of claims 1 to 7, characterized in that: The stripping ejector rod is pushed by a stripping spring, and the stripping spring is arranged on the inner side of the lower die base, and the top end of the stripping spring is directly connected to the bottom end of the stripping ejector rod.

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