CN113102618A

CN113102618A - Anti-blocking die hole structure, lower stamping die and machining process of dense small meshes

Info

Publication number: CN113102618A
Application number: CN202110574249.3A
Authority: CN
Inventors: 邵传清; 李大文
Original assignee: Shenzhen Pengfu Innovation Technology Co ltd
Current assignee: Shenzhen Pengfu Innovation Industry Co.,Ltd.
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-07-13
Anticipated expiration: 2041-05-25
Also published as: CN113102618B

Abstract

The application belongs to the technical field of punching processing and relates to a processing technology of an anti-blocking die hole structure, a punching lower die and dense small meshes. The anti-blocking die hole structure comprises an initial cylindrical section at the upper part and an outward-expanding blanking cylindrical section at the lower part, the horizontal section of the initial cylindrical section is matched with the horizontal section of a mesh to be machined of a workpiece, and the section width of the blanking cylindrical section is greater than the depth of the mesh to be machined of the workpiece. The die hole of the lower stamping die adopts the anti-blocking die hole structure. The punching lower die is adopted in the processing technology of the dense small meshes, and a mode of scattered multi-time punching processing is adopted, namely, the meshes on the processing surface of the workpiece are punched for a plurality of times, the area punched each time is staggered with the area punched, and the area punched each time is scattered on the processing surface of the workpiece. This application is suitable for the processing of the intensive little mesh of soft metal sheet material, can avoid the putty phenomenon almost completely, punches a hole and does not produce the burr, moreover, can ensure the structural strength of lower mould.

Description

Anti-blocking die hole structure, lower stamping die and machining process of dense small meshes

Technical Field

The application relates to the field of punching processing, in particular to a processing technology of an anti-blocking die hole structure, a punching lower die and dense small meshes.

Background

The processing hole on the plate usually adopts the punching process, refer to a in fig. 1, the die hole 11 of the lower die of the punching process is usually vertically arranged, and is generally arranged into two sections from top to bottom along the lower die body 1, the upper section is an initial cylindrical section 111 with the horizontal cross section matched with the horizontal cross section of the mesh to be processed of the workpiece, the lower section is a blanking conical section 112, and the inner space of the blanking conical section 112 is gradually enlarged from top to bottom. On one hand, the die hole 11 formed by the initial cylindrical section 111 and the blanking conical section 112 is beneficial to blanking of the punched waste 2 because the inner space of the lower part of the die hole 11 is gradually enlarged; on the other hand, the upper part of the die hole 11 is hollowed to have a small space, which is beneficial to ensuring the structural strength of the lower die so as to resist the impact of the punch head on the lower die in the punching process; moreover, the die holes 11 in the form of the initial cylindrical section 111 and the blanking conical section 112 can be machined by wire cutting, and the machining cost is relatively low.

Many plate members are punched by using the lower die having the die hole 11 with the initial cylindrical section 111 and the blanking tapered section 112, however, in the actual production process, it is found that the material blockage is easily generated in the punching process of the small sound box housing. On one hand, the waste 2 blocked in the die hole 11 not only affects the downward movement of the punch, but also easily causes the burr phenomenon of meshes machined on the shell of the sound box; on the other hand, different from a common plate, in order to enhance the outward transmission effect of the sound volume and improve the use experience, the mesh holes on the small sound box shell are usually very small and dense (see G in fig. 4), the die holes 11 of the corresponding lower die are also relatively small and dense, and the cleaning is time-consuming and labor-consuming.

Disclosure of Invention

In order to alleviate the putty phenomenon when punching a hole, this application provides the processing technology of anti-blocking die hole structure, punching press lower mould and intensive little mesh.

In a first aspect, the application provides an anti-blocking die hole structure, which adopts the following technical scheme:

the utility model provides an anti-blocking die hole structure, includes the initial cylindricality section on upper portion and the blanking cylindricality section of the outer formula that expands of lower part, the horizontal cross-sectional shape of initial cylindricality section and the horizontal cross-sectional shape looks adaptation of waiting to process the mesh on the work piece, the horizontal cross-sectional width of blanking cylindricality section is greater than the degree of depth that the mesh was waited to process to the work piece.

By analyzing the die hole of the lower die where the material blockage occurs, as shown in a in fig. 1, it is found that the waste material 2 of the die hole 11 is generally stuck upside down on the upper portion of the blanking tapered section 112 of the die hole 11. Further, it is considered that turning over of the scrap 2 is caused by free turning over, and is also related to the material of the workpiece, the shape of the mesh on the workpiece, and the shape of the die hole 11. The relationship between the upset and the material of the workpiece, the shape of the mesh on the workpiece, and the shape of the die orifice 11 is now analyzed as follows: the horizontal section of mesh 31 (see G in fig. 4) on the small sound box housing to which the present application is directed is a kidney-shaped hole, and the vertical section is rectangular and the vertical height is greater than the horizontal width. Meanwhile, what the little audio amplifier shell that this application was directed to adopted is the aluminium 1050 material, and this kind of material is softer, does benefit to the shaping, but also lighter simultaneously, and has certain ductility. When the newly punched waste 2 falls to the blanking tapered section 112 of the die hole 11, the newly exposed side surface extends to a certain degree, when a point or area with fast extension first touches the inner surface of the die hole 11, friction is generated, and thus the waste 2 is turned over, the height direction of the original vertical section is gradually turned over to the horizontal direction, and finally the waste 2 is clamped in the blanking tapered section 112 of the die hole 11.

In view of the above-mentioned specific situation occurring in the small sound box housing punching process, the inventor of the present application decided to improve the die hole 11 by hollowing out the upper portion of the blanking tapered section 112 of the die hole 11 as shown in fig. 1 b by using the CNC processing technique to form the blanking cylindrical section 113 having a larger space than the initial cylindrical section 111. Because the upper inner space of the blanking cylindrical section 113 is much larger than that of the blanking conical section 112 in a in fig. 1, the waste material 2 falling to the blanking cylindrical section 113 can not be clamped in the blanking cylindrical section 113, no matter the waste material 2 is freely overturned or overturned due to friction with the inner wall of the die hole 11, so that the smoothness of falling of the waste material 2 is ensured, and the material blockage phenomenon is almost completely avoided.

Optionally, the height of the initial cylindrical section is 4-6 times of the depth of the mesh to be machined on the workpiece.

As shown in a of fig. 1, the depth of the mesh 31 to be processed on the workpiece 3 is the same as the height of the scrap 2 before turning, and in the conventional die hole 11, the height of the initial cylindrical section 111 is about 3 times the height of the scrap 2 before turning. In the present application, as shown in b in fig. 1, since the upper portion of the lower mold is further hollowed due to the arrangement of the blanking column section 113, and thus the structural strength of the lower mold is reduced to a certain extent, in order to improve the structural strength of the lower mold under this situation, the height of the initial column section 111 of the mold hole 11 is increased, the height of the blanking column section 113 is reduced, and thus the hollowed space of the upper portion of the lower mold is reduced, thereby weakening the phenomenon of the structural strength reduction of the lower mold due to the arrangement of the blanking column section 113. In addition, the height of the blanking cylindrical section 113 is reduced, and the inner space is reduced, so that the processing time of the die hole 11 can be reduced.

Optionally, the width of the horizontal section of the blanking cylindrical section is 3-5 times of the depth of the mesh to be processed of the workpiece.

As already mentioned above, the depth of the mesh 31 to be machined on the workpiece 3 is the same as the height of the scrap 2 before turning over. From the aspect of blanking, as shown in b in fig. 1, the larger the horizontal cross-sectional width of the blanking cylindrical section 113 is, the less likely the material is jammed. However, the larger the horizontal cross-sectional width of the blanking cylindrical section 113 is, on the one hand, the longer the processing time of the blanking cylindrical section 113 becomes; on the other hand, the blanking cylindrical section 113 is too large, and occupies the space of the lower die, which, for the case that the dense small meshes 31 need to be processed on the workpiece 3, will reduce the arrangement of the die holes 11 on the lower die used in each punching, thereby increasing the punching times (in conjunction with the following description of the processing technology for the dense small meshes 31). Comprehensively, the horizontal section width of the blanking cylindrical section 113 is limited in the range, so that the material blockage phenomenon can be hardly generated, and the punching times during machining of the dense small meshes 31 can be reduced as much as possible.

In a second aspect, the present application provides a lower die hole of punching, which adopts the following technical scheme:

the utility model provides a punching press lower mould, adopts foretell anti-blocking die hole structure, can effectively avoid the putty phenomenon, alleviates the clearance to the die hole of punching press lower mould greatly, and this has very strong practical meaning to the process of punching a hole that needs the intensive little mesh of processing.

In a third aspect, the application provides a processing technology of dense small meshes, which adopts the following technical scheme:

the machining process of the dense small meshes adopts a dispersed multi-time punching machining mode, namely, the meshes on the machining surface of a workpiece are formed by punching for a plurality of times, the area punched each time is staggered with the area punched before, and the area punched each time is distributed on the machining surface of the workpiece in a dispersed manner, wherein the die holes on the lower die adopted during punching are of the anti-blocking die hole structure.

The method of the dispersed multiple punching processing is adopted, and as shown in fig. 3, the method has the following advantages: firstly, the blanking cylindrical section 113 of the die hole 11 of the lower die occupies a certain space, so that the distance between the die holes 11 of the lower die is not very tight, which cannot meet the requirement of processing the workpiece 3 with dense small meshes 31, and the problem can be solved by adopting the dispersed multi-time punching processing mode; secondly, the workpiece 3 to be processed with the intensive small meshes 31 is usually a thin plate, the structural strength of the workpiece is low, the thin plate is easily damaged if one-time punching is finished, and the problem can be effectively solved by the scattered multiple punching processing mode; thirdly, the lower mould bears great impact force in the punching process, if need once only process intensive little mesh 31 on work piece 3, then correspond, need set up intensive miniature nib 11 on the lower mould, this structural strength that will weaken the lower mould greatly, probably damaged in the punching process, and adopt the mode of above-mentioned dispersion processing of punching a hole many times, the nib 11 of the lower mould that corresponds when punching a hole at every turn is few to can effectively ensure the structural strength of lower mould.

Optionally, the shortest distance between adjacent die holes of the lower die adopted in each stamping process is 1-2 times of the width of the horizontal section of the blanking column.

As shown in fig. 3, the larger the distance between the adjacent holes 11 of the lower die used in each punching process is, the more beneficial the structural strength of the lower die and the punching quality of the workpiece 3 are to be ensured, but at the same time, for the workpiece 3 requiring dense machining of the small mesh 31, the punching times are increased, and the efficiency is reduced. This application carries out reasonable injecing through adopting above-mentioned technical scheme, the distance between the adjacent nib 11 of the lower mould that will adopt when punching press at every turn, can reduce the number of times of punching a hole under the prerequisite of guarantee lower mould structural strength and 3 qualities of punching a hole of work piece, improves production efficiency.

Optionally, the workpiece is made of soft metal, so that molding is facilitated.

As mentioned above, the soft metal is beneficial for forming, and is one of the important considerations for the small sound box housing, which requires fine, small and dense punching.

Optionally, the workpiece is made of aluminum 1050.

Aluminum 1050 is not only soft but also light, and is very practical for lightweight products such as small speaker enclosures.

Optionally, the workpiece is a sound box shell.

The sound box shell is a typical workpiece needing to be processed with dense small meshes, the dispersed multiple-punching processing mode is adopted, the sound box shell can be well processed, the material blockage phenomenon is hardly caused, the punched edge is free of burrs, and the overall quality is high.

To sum up, the application comprises the following beneficial technical effects:

1. aiming at the special condition of intensive small mesh punching of aluminum plates, the upper part of a conical blanking section of a die hole is hollowed to form a cylindrical blanking section with a space larger than that of an initial cylindrical section, and when punched waste falls to the cylindrical blanking section, the waste cannot be clamped in the cylindrical blanking section no matter the waste is freely overturned or overturned due to friction with the inner wall of the die hole, so that the smoothness of falling of the waste is ensured, and the phenomenon of material blockage is almost completely avoided;

2. this application increases the height of the initial cylindricality section of nib, has reduced the height of blanking cylindricality section, will reduce the space that lower mould upper portion was hollowed out from this, has weakened the phenomenon that the lower mould structural strength reduces because of the setting of blanking cylindricality section arouses from this. In addition, the height of the blanking cylindrical section is reduced, and the inner space is reduced, so that the processing time of the die hole can be reduced;

3. this application adopts the mode that the processing of punching a hole many times of dispersion, can cooperate the setting of the nib structure of this application for the distance between the nib of the lower mould of use can not closely be very much, ensures the structural strength of lower mould, is favorable to improving the quality of punching a hole of the intensive little mesh of sheet spare moreover.

Drawings

Fig. 1 a is a schematic vertical sectional structure of a conventional die hole along its horizontal width direction;

b in FIG. 1 is a schematic vertical sectional structure view of the anti-blocking die hole in the horizontal width direction of the anti-blocking die hole in the embodiment 1;

FIG. 2 is a plan view of a lower mold of example 2;

FIG. 3 is a bottom view of the lower mold of embodiment 2;

FIG. 4A is a schematic view showing the mesh distribution of the first punches of the workpiece in the case of example 3;

FIG. 4B is a schematic view showing the mesh distribution of the second punching of the workpiece in the case of example 3;

fig. 4C is a schematic view showing the mesh distribution of the third punching of the workpiece in the case of example 3;

fig. 4D is a schematic view showing the mesh distribution of the fourth punched holes of the workpiece in the case of example 3;

fig. 4E is a schematic diagram showing the mesh distribution of the fifth punched holes of the workpiece in the case of example 3;

FIG. 4F is a schematic view showing the mesh distribution of the sixth punch of the workpiece of example 3;

in FIG. 4G is a schematic diagram of the mesh distribution after completion of punching the workpiece in example 3.

Description of reference numerals: 1. a lower die body; 11. a die hole; 111. an initial cylindrical section; 112. a blanking conical section; 113. blanking a cylindrical section; 12. mounting holes; 2. waste materials; 3. a workpiece; 31. and (4) meshes.

Detailed Description

The present application is described in further detail below.

Example 1

The embodiment discloses an anti-blocking die hole 11 structure, refer to a in fig. 1, which is opened on a lower die body 1 and includes an upper initial cylindrical section 111 and a lower outward-expanding blanking cylindrical section 113.

The horizontal cross-sectional shape of the initial cylindrical section 111 is adapted to the horizontal cross-sectional shape of the mesh 31 to be machined on the workpiece 3. The depth of the mesh 31 to be processed on the workpiece 3 is the same as the height of the corresponding generated waste 2, and the height of the initial cylindrical section 111 is 4-6 times of the height of the waste 2. The horizontal section width of the blanking cylindrical section 113 is 3-5 times of the height of the waste 2.

Example 2

The embodiment discloses a lower stamping die, and the die hole 11 on the lower stamping die adopts the structure of the anti-blocking die hole 11 in the embodiment 1.

Example 3

The embodiment discloses a processing technology of dense small meshes 31, which adopts a mode of dispersed multiple punching, namely, the meshes 31 on the processing surface of a workpiece 3 are formed by punching for multiple times, the area punched each time is staggered with the area punched before, and the areas punched each time are distributed on the processing surface of the workpiece 3 in a dispersed way, wherein the lower die adopted in the punching process adopts the lower punching die in the embodiment 2.

Case(s)

Referring to G in fig. 4, the workpiece 3 in this case is a small mini sound box housing. The shell of the workpiece 3 is made of aluminum 1050, the thickness of the shell is 1mm, the whole shell is rectangular, the edge of the shell is in a micro arc shape, and the surface of the shell is provided with a plurality of dense small-sized meshes 31. The mesh 31 is a columnar hole having a substantially kidney-shaped horizontal cross section, and a small number of columnar holes having a circular horizontal cross section are provided in the center and around the workpiece 3. The width of the waist-shaped hole and the diameter of the circle are smaller than the respective depth, and are both about 0.7 mm. The shortest distance between adjacent meshes 31 is around 0.8 mm.

As described earlier in the application, the die hole 11 of the conventional lower punching die is shown as a in FIG. 1, the upper section is an initial cylindrical section 111 with a horizontal section matched with the horizontal section of the mesh 31 of the workpiece 3, and the lower section is a blanking conical section 112. However, in practice, the problems that the material is easily blocked, and further punching burrs and the die holes 11 are difficult to clean are found to be caused because the method is not suitable for punching the small mini sound box shell. Through observation and further analysis, it is considered that the material blockage is related to the fact that the waste material 2 turns over and is obliquely clamped in the blanking conical section 112 during the falling process of the original vertical waste material 2, and the turning over of the waste material 2 is caused by free turning and also related to the material of the workpiece 3, the shape of the mesh 31 on the workpiece 3 and the shape of the die hole 11 at the same time: little mini audio amplifier shell is the aluminium 1050 material, has certain ductility, and when the waste material 2 that newly punches fell to blanking toper section 112, the extension appeared in the side that newly exposes, when the faster point of extension or regional first touch the internal surface of die hole 11, produces the friction to lead to the upset of waste material 2 piece from this.

Therefore, the inventor of the application improves the die hole 11 of the lower die and the processing technology at the same time:

for the die hole 11 of the lower die, the CNC machining technology is adopted to empty the upper part of the blanking conical section 112 of the die hole 11, a blanking cylindrical section 113 which is larger than the space in the initial cylindrical section 111 as shown in fig. 2 is formed, the blanking cylindrical section falls to the waste material 2 of the blanking cylindrical section 113, whether free overturning occurs or overturning occurs due to friction with the inner wall of the die hole 11, the blanking cylindrical section 113 cannot be clamped, the smoothness of falling of the waste material 2 is ensured, the material blocking phenomenon is almost completely avoided, and punching is free of burrs.

In order to match the situation that the mesh openings 31 on the small mini sound box shell are small and very dense, the inventor of the present application decides to perform punching for six times by adopting the punching process of the dispersed multiple times in the embodiment 3, the distribution of the first punching to the sixth punching on the workpiece 3 is staggered as shown in a to F in fig. 4, and finally the mesh opening 31 distribution shown in G in fig. 4 is formed. The process ensures that the distance between the die holes 11 of the lower die is not very tight during each punching, the die hole 11 structure introduced in the embodiment 1 can be processed, the structural strength of the lower die is guaranteed, and the aluminum 1050 plate with the thickness of only 1mm is not damaged during punching.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. Anti-blocking die hole structure, its characterized in that: the mesh opening machining device comprises an initial cylindrical section (111) at the upper part and an outward-expanding blanking cylindrical section (113) at the lower part, wherein the horizontal cross section of the initial cylindrical section (111) is matched with the horizontal cross section of a mesh opening (31) to be machined on a workpiece (3), and the horizontal cross section of the blanking cylindrical section (113) is wider than the depth of the mesh opening (31) to be machined on the workpiece (3).

2. The anti-blocking die hole structure of claim 1, characterized in that: the height of the initial cylindrical section (111) is 4-6 times of the depth of the mesh (31) to be processed on the workpiece (3).

3. The anti-blocking die hole structure of claim 1, characterized in that: the horizontal section width of the blanking cylindrical section (113) is 3-5 times of the depth of the mesh (31) to be processed of the workpiece (3).

4. Punching press lower mould, its characterized in that: the die hole (11) of the lower stamping die adopts the anti-blocking die hole structure as claimed in any one of claims 1 to 3.

5. The processing technology of the dense small meshes is characterized in that: the method adopts a dispersed multi-punching processing mode, namely, the mesh (31) on the processing surface of the workpiece (3) is formed by punching for a plurality of times, the area punched each time is staggered with the area punched before, and the area punched each time is distributed on the processing surface of the workpiece (3), wherein the die hole (11) on the lower die adopted during punching is the anti-blocking die hole structure as claimed in any one of claims 1 to 3.

6. The dense small mesh processing technology of claim 5, wherein: the shortest distance between the adjacent die holes (11) of the lower die adopted in each stamping process is 1-2 times of the width of the horizontal section of the blanking column.

7. The dense small mesh processing technology of claim 5, wherein: the workpiece (3) is made of soft metal.

8. The dense small mesh processing technology of claim 5, wherein: the workpiece (3) is made of aluminum 1050.

9. The dense small mesh processing technology of claim 5, wherein: the workpiece (3) is a sound box shell.