CN111974853B

CN111974853B - Positive dress formula aperture flanging dies under electric field effect

Info

Publication number: CN111974853B
Application number: CN202010617874.7A
Authority: CN
Inventors: 吕知清; 薛朝伟; 王玉诚; 孙会山
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2022-10-28
Anticipated expiration: 2040-07-01
Also published as: CN111974853A

Abstract

The invention relates to a forward-installed type small-hole flanging die under the action of an electric field, which comprises a die carrier, an electrode device, an insulating device and a discharging device, wherein an upper die holder is connected with a lower die holder through a guide mechanism consisting of a die carrier guide sleeve and a die carrier guide column, the upper die holder is connected with a male die base plate, a male die, a guide column, a pressure plate and a spring to form an upper die of the die, a cylindrical positive electrode with an elastic insulating sleeve is arranged around a male die through hole in the center of the pressure plate, the lower die holder, a fixed block, a piece unloading device, the spring and a female die form a lower die of the die, and a negative electrode with the elastic insulating sleeve is arranged in the middle of the piece unloading device to ensure that a loop is formed with the positive electrode during working. The invention aims to provide an electric auxiliary small hole flanging die for ultrahigh-strength materials, which directly heats a main forming area by Joule resistance heat generated by current flowing through the main forming area of a blank and then applies certain pressure to the blank through a pressurizing device so as to enable the materials to be easily formed.

Description

Positive dress formula aperture flanging dies under electric field effect

Technical Field

The invention relates to a forward-installed type small-hole flanging die under the action of an electric field, and belongs to the technical field of stamping.

Background

The flanging technique is a forming method which utilizes the action of a die to form a straight wall or a flange with a certain angle on a blank along a closed or unclosed curve edge. The flanging is one of stamping processes, and can be used for flanging the outer edge or hole edge of a blank or a semi-finished product into a vertical edge along a certain curve; the flanging method can be used for processing three-dimensional parts with more complex shapes and good rigidity, and parts assembled with other product parts can be manufactured on the stamped parts, such as the flanging of a middle wall plate of a passenger car of a locomotive vehicle, the flanging of a pressing iron of a pedal door of the passenger car, the flanging of an outer door plate of an automobile, the flanging of a fuel tank of a motorcycle, the flanging of a small threaded hole of a metal plate and the like. The flanging can replace the deep drawing process of some complex parts, and the plastic fluidity of the material is improved so as to avoid cracking or wrinkling; the method of drawing first and then cutting is replaced to prepare bottomless parts, so that the processing times can be reduced, and materials are saved. Compared with other traditional materials, the ultrahigh-strength material is more difficult to flange and form. The ultrahigh-strength material has higher strength, but the plasticity is poorer, so that a series of problems of incapability of bending, serious resilience, poorer precision and the like can exist by adopting a common stamping die. Under the support of the prior art scheme in the field, the problems of serious material resilience and difficult forming can not be well solved, an electric auxiliary stamping structure is adopted, the blank can quickly complete the flanging process under the action of current, the forming problem of high-strength materials can be better improved compared with the prior art scheme, and the requirement of products on precision is further improved.

Disclosure of Invention

The invention aims to provide a forward-installed type small hole flanging die under the action of an electric field, which directly heats a main forming area by Joule resistance heat generated by current flowing through the main forming area of a blank, and then applies certain pressure to the blank through a pressurizing device, so that the material is easy to form. The invention can solve the problems of serious rebound phenomenon, difficult forming and the like of the ultrahigh-strength sheet in the bending process.

In order to achieve the purpose, the invention adopts the technical scheme that:

a forward-installed type small-hole flanging die under the action of an electric field comprises a die frame, an electrode device, an insulating device and a discharging device, wherein the electrode device consists of a positive electrode placed at the center of a pressure plate and a negative electrode placed on an unloading device, the insulating device consists of an elastic insulating sleeve sleeved on the electrode, the discharging device consists of an unloading device, a spring and a fixed block, the unloading device is placed at the through hole of a female die, the spring and the unloading device are fixed by fasteners arranged on the fixed block and the female die, and the pressure plate is positioned above the female die and is connected with a male die base plate and an upper die base through a guide pillar.

The technical scheme of the invention is further improved as follows: the positive electrode is a revolving body, the surface of the positive electrode is sleeved with an elastic insulating sleeve, the main shape of the positive electrode is composed of two cylinders with different diameters, a large cylinder faces upwards and is provided with a binding post, and a middle through hole is formed in the middle of the positive electrode, can be passed by a male die and is larger than a female die through hole.

The technical scheme of the invention is further improved as follows: the positive electrode insulating elastic sleeve is a revolving body, the main shape of the positive electrode insulating elastic sleeve is composed of two cylinders, a large cylinder faces upwards, a step through hole is formed in the middle of the large cylinder, the diameter of the step through hole of the insulating elastic sleeve is consistent with that of the positive electrode, the positive electrode can be arranged on the elastic insulating sleeve, and the positive electrode with the elastic insulating sleeve is arranged at the step through hole in the center of the pressure plate.

The technical scheme of the invention is further improved as follows: the center of the pressure plate is provided with a step through hole, a cylindrical positive electrode sleeved with an insulating elastic sleeve can be placed on the step through hole, and the pressure plate is provided with a plurality of step through holes for connecting guide posts.

The technical scheme of the invention is further improved as follows: the negative electrode is mainly cylindrical, the surface of the negative electrode is sleeved with an elastic insulating sleeve, the diameter of the elastic insulating sleeve is smaller than that of the through hole of the female die and larger than that of the male die, and the end with the binding post faces downwards.

The technical scheme of the invention is further improved as follows: the negative electrode elastic insulating sleeve is cylindrical, the diameter of the negative electrode elastic insulating sleeve is consistent with that of the upper part of the hole of the part unloading device, a stepped hole is formed in the middle of the negative electrode elastic insulating sleeve, the large hole faces upwards, and the diameter of the large hole is slightly larger than that of the male die.

The technical scheme of the invention is further improved as follows: the small cylinder of the piece unloading device faces upwards, the large cylinder faces downwards, holes are formed in the two ends of the small cylinder, a central through hole is formed, the diameter of the hole of the small cylinder in the upper portion of the piece unloading device is larger than that of the male die, and the hole in the upper portion of the piece unloading device is used for accommodating a cylindrical negative electrode sleeved with an elastic insulating sleeve.

Due to the adoption of the technical scheme, the invention has the following technical effects:

compared with the modern technology, the invention arranges the positive electrode at the contact area of the edge of the through hole of the female die and the pressure plate, arranges the negative electrode at the upper part of the part unloading device, leads the current to flow from the pressure plate to the main forming area through the blank at the edge of the through hole of the female die, directly heats the main forming area of the blank by Joule resistance heat generated by the current flowing through the blank, leads the temperature of the main forming area to be uniformly distributed and kept in the forming temperature range, and then applies a certain pressure to the blank by the pressurizing device, leads the blank to generate plastic deformation in the die, is beneficial to the plastic deformation of the blank, improves the product quality, and can effectively reduce the problems that the high-strength material possibly cannot be bent and has serious resilience caused by the traditional flanging. In addition, the flanging device disclosed by the invention has the characteristics of simple structure, high forming efficiency, low energy consumption, stable product quality and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic sectional front view of the present invention;

FIG. 3 is a perspective view of the lower die base of the present invention;

FIG. 4 is a schematic cross-sectional front view of a male die plate of the present invention;

FIG. 5 is a schematic perspective view of a positive electrode covered with an insulating elastic sheath according to the present invention;

FIG. 6 is a schematic view of a negative electrode of the present invention sheathed with an insulating elastic sheath;

FIG. 7 is a schematic perspective view of a male mold of the invention;

FIG. 8 is a schematic front sectional view of a female mold of the present invention;

FIG. 9 is a perspective view of the cylindrical fixing block of the present invention;

fig. 10 is a perspective view of the cylindrical mold frame guide post of the present invention.

The device comprises an upper die base 1, an upper die base 2, a male die backing plate 3, a guide post spring 4-1, a positive electrode 4-2, an insulating elastic sleeve 5, a guide post 6, a male die 7, a pressure plate 8, a female die 9, a part unloading device 10, a lower die base 11-1, a negative electrode 11-2, an elastic insulating sleeve 12, a spring 13, a fixing block 14-1, a die frame guide sleeve 14-2 and a die frame guide post.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the invention discloses a positively-installed small-hole flanging die under the action of an electric field, and aims to solve the problems that an ultrahigh-strength sheet is serious in rebound phenomenon and difficult to form in the bending process. The device comprises a die carrier, an electrode device, an insulating device and a discharging device, wherein the electrode device is composed of a positive electrode 4-1 placed at the center of a pressure plate 7 and a negative electrode 11-1 placed on a piece unloading device 9, the insulating device is composed of an elastic insulating sleeve 4-2 sleeved on the electrode, and the discharging device is composed of the piece unloading device 9, a spring 12 and a fixed block 13.

As shown in fig. 1 and 2, in the schematic diagram of a forward-installed small-hole flanging die under the action of an electric field, a guide mechanism is arranged between an upper die holder 1 and a lower die holder 10, the upper end of a cylindrical die holder guide sleeve 14-1 of the guide mechanism is fixed in a through hole corresponding to the upper die holder 1, the lower end of the cylindrical die holder guide sleeve is sleeved on the upper portion of a die holder guide post 14-2, as shown in fig. 4 and 10, the lower end of the die holder guide post 14-2 is fixed in a through hole corresponding to the lower die holder 10, a punch backing plate 2, a punch 6 and a pressure plate 7 are arranged below the upper die holder 1, a plurality of through holes are arranged on the surface of the upper die holder 1, the punch backing plate 2 and the punch 6, the smaller through hole at the center corresponds to the hole of the punch 6 and the punch backing plate 2, the larger through hole corresponds to the through hole of the punch backing plate 2, fasteners arranged on the upper die holder 1, the punch backing plate 2 and the punch 6 are connected by a guide post spring 3 with a spring arranged on the upper die holder 1, the punch backing plate 2 and the punch plate 7, the pressure plate 7 is provided with a plurality of a positive electrode connecting hole for connecting with a positive electrode connecting post, a ring-4, and a positive electrode connecting post is arranged on the upper surface of the punch holder 1-4, and a ring connecting post for connecting post.

The upper die holder 1 is a square plate, a plurality of through holes are formed in the upper die holder, the male die 6 is a revolving body formed by two cylinders, a plurality of vertical holes with threads are formed in the end of a large cylinder, and the end of a small cylinder is in smooth transition; as shown in fig. 4, the center of the punch backing plate 2 is provided with a hole consistent with the large cylinder of the punch 6 and a plurality of through holes, the lower part of the pressure plate 7 is provided with a female die 8 corresponding to the pressure plate, as shown in fig. 8, the female die 8 is generally cylindrical, the surface is provided with a hole for placing a workpiece, the middle of the hole is provided with a through hole corresponding to the through hole of the pressure plate 7 and the punch 6, the insulating elastic sleeve 4-2 is a revolving body, the main shape of the insulating elastic sleeve is composed of two cylinders, the diameter of each cylinder is consistent with that of the stepped through hole in the center of the pressure plate 7, the large cylinder faces upwards, the middle of the insulating elastic sleeve is provided with the stepped through hole, and the minimum diameter of the hole is larger than that of the female die through hole; as shown in fig. 5, the cylindrical positive electrode 4-1 is a solid of revolution, and the main shape is composed of two cylinders, and the diameter of the cylinder is the same as the stepped through hole of the insulating elastic sleeve 4-2, the large cylinder faces upwards and is provided with a binding post, the middle through hole can be passed through by the convex die 6 and is larger than the through hole of the concave die 8, and the lower die holder 10 is arranged below the concave die 8.

As shown in figure 3, the lower die holder 10 is provided with a plurality of through holes, the middle of the lower die holder is provided with a stepped through hole corresponding to the central through hole of the female die 8, the lower surface of the lower die holder is provided with an arc-shaped groove, the stepped through hole consists of three holes with different diameters, the small hole faces upwards, the large hole faces downwards, the middle hole is provided with a plurality of threaded vertical screw holes, the diameter of the small hole is as large as that of the central through hole of the female die 8, a stepped cylindrical part unloading device 9 is arranged in the stepped through hole, the small cylinder of the part unloading device 9 faces upwards, the large cylinder faces downwards, the two ends of the large cylinder are provided with holes, the central through hole is provided with a diameter slightly larger than that of the male die 6, the upper part of the part unloading device 9 is flush with the central through hole of the female die 8, and the diameter of the lower part of the small cylinder is consistent with the inner diameter of the middle hole of the lower die holder 10, the lower end of the part unloading device 9 is provided with a spring 12 and is fixed by a fixing block 13 with through holes, as shown in figure 9, the fixing block 13 is cylindrical, the diameter of the fixing block 13 is consistent with that of a large hole of the lower die holder 10, a plurality of through holes are formed in the fixing block, the depth and the cross section of the fixing block are consistent with those of a groove of the lower die holder 10, a plurality of through holes are formed in the fixing block, a stepped through hole is formed in the center of the fixing block, the large hole faces upwards, the small hole faces downwards, the diameter of the large hole is consistent with that of a middle stepped hole of the lower die holder 10, the diameters of the other through holes are corresponding to a threaded vertical screw hole in the middle of the lower die holder 10, and a fastening piece arranged on the lower die holder 10 and the fixing block 13 corresponds to each other groove, so that the fixing block and the fixing block are connected.

Referring to fig. 2 and 6, a cylindrical negative electrode 11-1 with a binding post at the lower end and sleeved with an elastic insulating sleeve 11-2 is arranged at the hole at the upper part of the part unloading device 9, the elastic insulating sleeve 11-2 is cylindrical, the diameter of the elastic insulating sleeve 11-2 is consistent with that of the hole at the upper part of the part unloading device, a stepped hole is formed in the middle, a large hole is upward, and the diameter of the large hole is slightly larger than that of a male die; referring to fig. 2, 6 and 7, the diameter of the negative electrode 11-1 is slightly larger than that of the male die 6, the size of the negative electrode 11-1 is consistent with the diameter of an upper hole of the part unloading device 9 after being combined with the elastic insulating sleeve 11-2, the length of a combined part of the negative electrode 11-1 and the elastic insulating sleeve 11-2 is consistent with the depth of the upper hole of the part unloading device 9, the negative electrode 11-1 is kept level with the part unloading device 9, a plurality of through holes of the lower die holder 10 correspond to a plurality of threaded vertical screw holes on the lower surface of the female die 8, and the lower die holder 10 and the female die 8 are connected through fasteners arranged on the lower die holder 10 and the female die 8.

The working process of the invention is roughly as follows: the mould is initially in the mould opening state and is arranged on a common press. The power live wire of the positive pole of the external connection binding post and the power zero line of the negative pole of the external connection binding post are in an opening state.

Manually placing a blank in a positioning groove of the female die 8, contacting the negative electrode 11-1 with the blank firstly, and starting the press machine without the intervention of an electric field in the process; the upper die holder 1, the punch backing plate 2, the punch 6 and the pressure plate 7 move downwards along with the press, and the die holder guide sleeve 14-1 axially slides along the die holder guide post 14-2. The pressing plate 7 is contacted with the blank along with the descending of the upper die to realize a pressing state, at the moment, a positive electrode 4-1 in the pressing plate 7 is contacted with the blank to form an electric loop, current flows through the plate from the positive electrode 4-1 and finally flows out from a negative electrode 11-1 of the female die 8, in the process, the current mainly passes through a main forming area between the negative electrode 11-1 and the male die 6 to heat the main forming area, the forming is facilitated, a guide pillar spring 3 in the pressing plate 7 is stressed to shrink, so that the pressing plate 7 keeps the pressing state, and the upper die base 1, the male die base plate 2 and the male die 6 continue to descend along with the press. Until the male die 6 descends to the lowest point, and the obtained product is a flanging piece with a high-strength blank. And after flanging is finished, the upper die is lifted back, if the workpiece is left in the female die 8, the workpiece is pushed out of the female die by the workpiece unloading device 9, and if the workpiece is left on the male die 6, the workpiece is unloaded from the male die 6 by the material pressing plate 7. Thus completing one flanging operation.

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

Claims

1. The utility model provides a just adorn formula aperture flanging dies under electric field effect which characterized in that: the device comprises a die carrier, an electrode device, an insulating device and a discharging device, wherein the electrode device consists of a positive electrode placed at the center of a pressure plate and a negative electrode placed on the discharging device; the positive electrode is a revolving body, the surface of the positive electrode is sleeved with a positive electrode elastic insulating sleeve, the main shape of the positive electrode elastic insulating sleeve is composed of two cylinders with different diameters, a large cylinder faces upwards and is provided with a binding post, and a middle through hole is formed in the middle of the positive electrode elastic insulating sleeve, can be passed by a male die and is larger than a female die through hole; the insulating device consists of a positive electrode elastic insulating sleeve and a negative electrode elastic insulating sleeve, the unloading device consists of an unloading device, a spring and a fixed block, the unloading device is placed at the through hole of the female die, the spring and the part unloading device are fixed by fasteners arranged on the fixing block and the female die, and the pressure plate is positioned above the female die and is connected with the male die base plate and the upper die base through a guide pillar;

the positive electrode elastic insulating sleeve is a revolving body, the main shape of the positive electrode elastic insulating sleeve is composed of two cylinders, a large cylinder faces upwards, a step through hole is formed in the middle of the large cylinder, the diameter of the step through hole of the positive electrode elastic insulating sleeve is consistent with that of the positive electrode, the positive electrode can be arranged on the positive electrode elastic insulating sleeve, and the positive electrode with the positive electrode elastic insulating sleeve is arranged at the step through hole in the center of the pressure plate;

the negative electrode is mainly cylindrical, the surface of the negative electrode is sleeved with a negative electrode elastic insulating sleeve, the diameter of the negative electrode elastic insulating sleeve is smaller than that of the through hole of the female die and larger than that of the male die, and the end with the binding post faces downwards; the negative electrode elastic insulating sleeve is cylindrical, the diameter of the negative electrode elastic insulating sleeve is consistent with that of the upper part of the hole of the part unloading device, a stepped hole is formed in the middle of the negative electrode elastic insulating sleeve, the large hole faces upwards, and the diameter of the large hole is slightly larger than that of the male die;

the small cylinder of the piece unloading device faces upwards, the large cylinder faces downwards, holes are formed in the two ends of the small cylinder, a central through hole is formed, the diameter of the hole of the small cylinder in the upper portion of the piece unloading device is larger than that of the male die, and the hole in the upper portion of the piece unloading device is used for accommodating a cylindrical negative electrode sleeved with a negative electrode elastic insulating sleeve.

2. The upright small-hole flanging die under the action of the electric field of claim 1, which is characterized in that: the center of the pressure plate is provided with a step through hole, a cylindrical positive electrode sleeved with a positive electrode elastic insulating sleeve is placed on the step through hole, and the step through hole is provided with a plurality of step through holes for connecting a guide pillar.