Scissor type trimming die

Abstract

A punch fixing seat is fixedly arranged at the lower end of an upper die holder, a punch groove is arranged at the lower end of the punch fixing seat, a trimming punch is embedded in the punch groove, the trimming punch comprises two split punch bodies which are symmetrical in the vertical direction, a shearing groove is arranged on the inner edge of the lower portion of each split punch body, and the upper die holder and the lower die holder are arranged in the shearing groove. The upper ends of the two half-type punches are respectively hinged with the punch grooves through rotating pins, the lower die holder is provided with a lower die fixing seat, the lower die fixing seat is provided with a machining groove, inserts are arranged on two sides of the machining groove, inclined planes are arranged on the inner sides of the upper ends of the inserts, and the lower ends of the half-type punches are matched with the inclined planes in a sliding mode. The vertical stamping force is changed into the inward extrusion force, the product with the 90-degree bending angle can be normally trimmed under the condition of not increasing working procedures, the extrusion depth of the product can be rapidly adjusted according to the material thickness and the springback amount of the product, and the stability of product forming is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of trimming dies, in particular to a scissor-type trimming die. Background Art

[0002] In a traditional trimming die, the punch is fixed in the upper die clamping plate, and the method of adding a root support in the lower die is only applicable to products with relatively flat outer shapes and small bending angle tolerances.

[0003] When the product angle is 90°, such a structure cannot perform front trimming. To perform outer shape trimming, it is necessary to first perform front trimming and then add a side trimming process. The punching is carried out by means of side pushing. Adding the side trimming process increases the die cost and has many disadvantages in terms of structure. For example, it occupies a large space, has a high cost, is difficult to process, is inconvenient to debug, and is prone to burrs during production.

[0004] Therefore, it is necessary to design a positive trimming mechanism that occupies a small space and has stable production. Summary of the Invention

[0005] The purpose of the utility model is to provide a scissor-type trimming die.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A scissor-type trimming die, characterized in that it includes an upper die base, a blank holder, a trimming punch, and a lower die base. A punch fixing seat is fixedly arranged at the lower end of the upper die base. A punch groove is arranged along the left-right direction at the lower end of the punch fixing seat. The trimming punch is embedded in the punch groove. The trimming punch includes two split punches that are vertically symmetrical. A shearing groove is arranged at the inner edge of the lower part of the split punch. The upper ends of the two split punches are respectively hinged to the punch groove through a rotating pin. The rotating pin penetrates through the split punch and the punch fixing seat along the front-back direction. The two split punches are connected by a rectangular spring in the left-right direction. A lower die fixing seat is fixedly arranged at the upper end of the lower die base. A processing groove is arranged at the upper end of the lower die fixing seat. A pair of inserts are arranged on the left and right sides of the processing groove. An inclined surface is arranged at the inner side of the upper end of the insert. The lower end of the split punch is in sliding cooperation with the inclined surface. When the split punch slides down along the inclined surface to the bottom end of the processing groove, the rectangular spring is in a compressed state. The upper end of the blank holder is movably connected to the lower end of the upper die base through a nitrogen spring. A blank holding groove is arranged along the front-back direction at the lower end of the blank holder. The blank holding groove corresponds to the position of the shearing groove. A matching knife groove is arranged at the center of the lower die fixing seat and the lower die base. A cutting edge insert protrudes at the upper end of the knife groove.

[0008] Further, a self-lubricating plate is arranged at the front side of the processing groove.

[0009] Further, the upper end of the pressure plate is movably connected to the lower end of the upper die holder through the insertion and guiding of guide posts and guide sleeves.

[0010] Further, two hooks are fixedly provided at the lower end of the upper die holder. The hooks are symmetrically arranged left and right, and the lower end of the pressure plate is limited by the hooks.

[0011] Further, stop screws are sleeved at both ends of the rotating pin.

[0012] Further, the lower die holder is installed on the lower supporting plate through lower feet.

[0013] The utility model adopts a scissor-type trimming method, which changes the vertically upward and downward stamping force into an inward extrusion force. Without adding processes, normal trimming can be carried out on products with a bending angle of 90°. The extrusion depth of the product is quickly adjusted according to the material thickness and springback amount of the product, which is flexible and practical, improves the stability of product forming, and ensures product accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 is a schematic diagram of the disassembled structure of the utility model.

[0016] REFERENCE SIGNS:

[0017] 1 upper die holder, 2 split punch, 3 punch slot, 4 punch fixing seat, 5 rectangular spring,

[0018] 6 insert, 7 machining slot, 8 lower die fixing seat, 9 inclined surface, 10 sheet material,

[0019] 11 cutting edge insert, 12 lower die holder, 13 lower feet, 14 lower supporting plate, 15 lower template,

[0020] 16 inner positioning part, 17 rotating pin, 18 stop screw, 19 hook, 20 pressure plate,

[0021] 21 nitrogen spring, 22 guide post, 23 guide sleeve, 24 self-lubricating plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions of the utility model will be clearly and completely described below with reference to the drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.

[0023] The utility model discloses a scissor-type trimming die, as Figure 1As shown in the figure, it includes an upper die base 1, a blank holder 20, a trimming punch, and a lower die base 12. A punch fixing seat 4 is fixedly provided at the lower end of the upper die base 1. A punch groove 3 is provided at the lower end of the punch fixing seat 4 along the left - right direction. The trimming punch is embedded in the punch groove 3.

[0024] The trimming punch includes two split punches 2 that are vertically symmetric. A shear groove is provided at the inner edge of the lower part of the split punch 2. The upper ends of the two split punches 2 are respectively hinged to the punch groove 3 through a rotating pin 17. Stopping screws 18 are sleeved at both ends of the rotating pin 17. The rotating pin 17 penetrates through the split punch 2 and the punch fixing seat 4 in the front - back direction. The two split punches 2 are connected by a rectangular spring 5 in the left - right direction.

[0025] The lower die base 12 is installed on the lower support plate 14 through lower feet 13. As Figure 2 shown in the figure, a lower die fixing seat 8 and a lower template 15 are fixedly provided at the upper end of the lower die base 12. A sheet material 10 is clamped front and back by the lower die fixing seat 8 and the lower template 15. A processing groove 7 is provided at the upper end of the lower die fixing seat 8. Knife grooves that match each other are provided at the centers of the lower die fixing seat 8, the processing groove 7, and the lower die base 12. A cutting edge insert 11 protrudes from the upper end of the knife groove. An arc - shaped inner positioning member 16 can be provided between the lower die fixing seat 8 and the lower template 15. The sheet material 10 can pass through the inner positioning member 16 in the front - back direction and is clamped and positioned by the inner positioning member 16.

[0026] A self - lubricating plate 24 is provided on the front side of the processing groove 7. A pair of inserts 6 are provided on the left and right sides of the processing groove 7. An inclined surface 9 is provided on the inner side of the upper end of the insert 6. The lower end of the split punch 2 slides in cooperation with the inclined surface 9. When the split punch 2 slides down to the bottom end of the processing groove 7 along the inclined surface 9, the rectangular spring 5 is in a compressed state. The upper end of the blank holder 20 is movably connected to the lower end of the upper die base 1 through a nitrogen spring 21. The upper end of the blank holder 20 is movably connected to the lower end of the upper die base 1 through the insertion and guiding of a guide post 22 and a guide sleeve 23. Two hooks 19 are fixedly provided at the lower end of the upper die base 1. The hooks 19 are symmetrically arranged left and right. The hooks 19 limit the lower end of the blank holder 20. A blank holding groove is provided at the lower end of the blank holder 20 along the front - back direction. The position of the blank holding groove corresponds to that of the shear groove.

[0027] When the utility model is put into use, the trimming punch is divided into two split punches 2. They are respectively limited in the punch groove 3 of the punch fixing seat 4. The punch fixing seat 4 is inserted into the groove at the bottom of the upper die base 1 to control the lateral force generated during trimming. The rotating pin 17 (Φ16.0 or Φ20.0) passes through the split punch 2 and the punch fixing seat 4. Since a rectangular spring 5 is provided between the two split punches 2, in the mold open state, a reverse outward force is applied to the two split punches 2 to make the two split punches 2 expand outward, so as to prevent the sheet material 10 from being taken into the stripper plate 20 during production.

[0028] When the mold is working, the nitrogen spring 21 first applies a force to the sheet 10, the blank holder 20 presses the sheet 10, and the split punch 2 presses down along the inclined surface 9. At this time, the force of the split punch 2 punching vertically up and down is changed into a force of squeezing inward, and the sheet 10 is cut (squeezed) off by using the principle of scissors, completing the stamping. The depth of cutting (squeezing) in can be adjusted according to the thickness and springback amount of the sheet 10.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scissors-type trimming die, characterized in that: The invention comprises an upper die seat, a pressure plate, a trimming punch and a lower die seat, wherein a punch fixing seat is fixedly arranged at the lower end of the upper die seat, a punch groove is arranged at the lower end of the punch fixing seat in the left-right direction, the trimming punch is embedded in the punch groove, the trimming punch comprises two vertically symmetrical half punches, the inner edge of the lower part of the half punches is provided with a shear groove, the upper ends of the two half punches are respectively hinged to the punch groove through a rotating pin, the rotating pin passes through the half punches and the punch fixing seat in the front-back direction, the two half punches are connected by a rectangular spring in the left-right direction, and a lower half punch is fixedly arranged at the upper end of the lower die seat The die fixing seat is provided with a processing groove at the upper end of the lower die fixing seat, and a pair of inserts are provided on the left and right sides of the processing groove. The inner side of the upper end of the insert is provided with an inclined surface, and the lower end of the split punch slides in cooperation with the inclined surface. When the split punch slides down the inclined surface to the bottom end of the processing groove, the rectangular spring is in a compressed state, and the upper end of the pressure plate is movably connected with the lower end of the upper die seat through a nitrogen spring, and the lower end of the pressure plate is provided with a pressure groove along the front-to-back direction, and the pressure groove corresponds to the position of the shear groove, and the lower die fixing seat and the lower die seat are provided with matching knife grooves in the center, and the upper end of the knife groove is protruding with a knife edge insert.

2. The scissors-type trimming mold according to claim 1, characterized in that: A self-lubricating plate is provided on the front side of the processing groove.

3. The scissors-type trimming mold according to claim 1, characterized in that: The upper end of the pressing plate is movably connected with the lower end of the upper die seat through the plug-in guiding of a guide column and a guide sleeve.

4. The scissors-type trimming die according to claim 1 or 3, characterized in that: Two hooks are fixedly provided at the lower end of the upper die seat, and the hooks are symmetrically arranged on the left and right sides, and the hooks limit the lower end of the pressing plate.

5. The scissors-type trimming die according to claim 1, characterized in that: The two ends of the rotating pin are sleeved with stop screws.

6. The scissors-type trimming die according to claim 1, characterized in that: The lower die base is mounted on the lower support plate through lower pads.

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