CN210188177U

CN210188177U - Die with durable punch

Info

Publication number: CN210188177U
Application number: CN201920837245.8U
Authority: CN
Inventors: Xuliao Chen; 陈旭燎; Hang Gao; 高航; Shijie Yu; 余仕杰
Original assignee: Fuzhou Huilong Machinery Mould Co Ltd
Current assignee: Fuzhou Huilong Machinery Mould Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-03-27
Anticipated expiration: 2029-06-05

Abstract

The utility model provides a die with a durable punch, which comprises an upper die and a lower die which are correspondingly arranged, wherein the upper die comprises a cylindrical punch and a pressure plate, the punch movably penetrates through the middle part of the pressure plate, the lower die is provided with a lower punch hole corresponding to the punch, and a top plate is movably arranged in the lower punch hole; the bottom surface edge of drift is the blade, the blade sets up an annular chamfer. The utility model discloses a blade department at drift bottom surface edge sets up the chamfer for the blade atress of changing the line is the face atress, and the area of stress increases, and the original impulsive force of concentrating obtains effective dispersion, can make the drift not fragile, increases the life of drift, and has promoted the yield of product.

Description

Die with durable punch

Technical Field

The utility model belongs to the technical field of the punching press technique and specifically relates to indicate a mould with durable drift.

Background

When the die is used for blanking products, parts need high aperture tolerance requirements, the hole roundness punched by the existing punch of common punching is poor, the parts are easy to deform, the product precision cannot meet the requirements of the parts, so fine punching is needed to be completed, the fine punching die is used for blanking a plate material in a three-dimensional pressed state, a punching die for a part with a high size precision and a non-cracked and non-torn punching section is punched, the blanking clearance of the fine punching is much smaller than that of the common blanking clearance, and the punch is often damaged in the fine punching process. As shown in fig. 1, the existing fine blanking punch 1 ' is a flat head, and the cutting edge 12 ' at the bottom edge of the punch 1 ' is in an annular linear structure during the fine blanking process, so that the stress of the punch is too concentrated at the cutting edge, and the maximum force is applied, so that the cutting edge 12 ' of the punch 1 ' is easily broken, the service life is affected, and the yield of the product is affected.

Disclosure of Invention

The to-be-solved technical problem of the utility model lies in providing a simple structure, not fragile mould of drift.

The utility model discloses a realize like this: a die with a durable punch comprises an upper die and a lower die which are arranged correspondingly, wherein the upper die comprises a cylindrical punch and a pressure plate, the pressure plate is a gear ring pressure plate, the punch movably penetrates through the middle part of the pressure plate, the lower die is provided with a lower punch hole corresponding to the punch, and a top plate is movably arranged in the lower punch hole; the bottom surface edge of drift is the blade, the blade sets up an annular chamfer.

Further, the annular chamfer is a C angle or an R angle.

Further, the distance between the oblique side of the C angle and the straight line direction is not more than 0.5 mm; the radius at the R angle is not more than 0.5mm, and the cutting edge can be effectively protected in such size range on the one hand, and on the other hand, the original effective shearing action of the cutting edge can be guaranteed.

Further, the pressure plate is a gear ring pressure plate.

The utility model has the advantages that: the chamfer is arranged at the edge of the bottom surface of the punch, so that the stress of the edge is changed into a surface stress, the stress area is increased, the original concentrated impact force is effectively dispersed, the punch is not easy to damage, the service life of the punch is prolonged, and the yield of products is improved.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a bottom view of a prior art punch construction.

Fig. 2 is a schematic structural view of a die with a durable punch according to the present invention.

Fig. 3 is a schematic view of the structure of the punch head of the present invention.

Fig. 4 is a schematic bottom view of the punch according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 2 to 4, a die 100 with a durable punch includes an upper die 1 and a lower die 2, which are arranged correspondingly, the upper die 1 includes a cylindrical punch 11 and a pressure plate 12, the pressure plate 12 is a gear ring pressure plate, the punch 11 movably penetrates through the middle of the pressure plate 12, the lower die 2 has a lower punch hole 21 corresponding to the punch 11, and a stripper plate 3 is movably arranged in the lower punch hole 21; the edge of the lower end face of the punch 11 is a cutting edge 111, and the cutting edge 111 is provided with an annular chamfer which can be a C angle or an R angle. Because the force borne by the cutting edge of the punch 11 is the largest and is excessively concentrated in the fine blanking process, the punch 11 is broken due to stretching, the stress area of the cutting edge 111 is increased by chamfering one point of the cutting edge 111, the stress at the cutting edge 111 of the punch 11 is reduced, blanking is not influenced, and the service life of the punch can be prolonged. The distance between the oblique side of the C angle and the straight line direction is not more than 0.5mm, and the radius of the R angle is not more than 0.5 mm. Such size range can effectively protect the blade on the one hand, and on the other hand can guarantee the original effectual shearing blanking effect of blade again.

The working principle is as follows: the fine blanking process is that the plate 200 is always in a plastic deformation process, the plate 200 is conveyed below the punch 11 and is positioned between the pressure plate 12 and the lower die 2 before the punch 11 contacts the plate 200, the plate 200 is pressed by the downward force PR of the pressure plate 12 and the lower die 2 firstly to prevent the plate 200 from flowing transversely in the blanking process, the plate 200 is pressed tightly by using the counter pressure PG of the top plate 3 while the punch 11 presses the plate 200, the bending deformation of the plate 200 is prevented, the punch 11 performs blanking under the action of the blanking force Ps in the pressing state, and the plate 200 is in a three-dimensional compressive stress state, so that the plasticity of the plate 200 is improved. At this time, the sheet material 200 is a pure shearing type blanking part along the edge shape of the lower die 2, when the edge of the cutting edge 111 at the lower end of the punch 11 is arranged in a C-angle chamfer, the stress area of the cutting edge 111 is increased, the stress at the edge end of the punch 11 is reduced, and the stress at the cutting edge of the punch can be reduced.

The stress at the punch edge end is α ═ P/a, where P is the blanking force and a is the cross-sectional area of the punch edge.

As mentioned above, the utility model discloses a set up the chamfer at the blade edge of drift, can make drift 11 not fragile, increase drift 11's life.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A die having a durable punch, characterized by: the punching die comprises an upper die and a lower die which are arranged correspondingly, wherein the upper die comprises a cylindrical punching head and a pressure plate, the punching head movably penetrates through the middle part of the pressure plate, a lower punching hole corresponding to the punching head is formed in the lower die, and a piece ejecting plate is movably arranged in the lower punching hole; the bottom surface edge of drift is the blade, the blade sets up an annular chamfer.

2. A die with a durable punch as in claim 1, wherein: the annular chamfer is a C angle or an R angle.

3. A die with a durable punch as in claim 2, wherein: the distance between the oblique side of the angle C and the straight line direction is not more than 0.5 mm; the radius of the R angle is not more than 0.5 mm.

4. A die with a durable punch as in claim 1, wherein: the pressure plate is a gear ring pressure plate.