CN212682196U

CN212682196U - Punch forming equipment for producing elastic metal sheet of thermal protector

Info

Publication number: CN212682196U
Application number: CN202021380716.6U
Authority: CN
Inventors: 李一明; 刘自成
Original assignee: Youxian Lian Cheng Electron Co ltd
Current assignee: Youxian Lian Cheng Electron Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-03-12
Anticipated expiration: 2030-07-14

Abstract

The utility model discloses a stamping forming equipment for producing hot protector elastic metal piece, including stamping die head group and with stamping die head assorted base, be provided with the feeding auxiliary structure that stimulates the raw materials strap on the base, be provided with first stamping die head and second stamping die head on the stamping die head group, first stamping die head includes first cambered surface stamping head, first cambered surface stamping head has the first punching arc face of underbeam, and the cambered surface radian that first punching arc face corresponds is 2/3~3/4 of waiting to shape elastic metal piece radian, and still is provided with the precutting sword on first punching arc face; and the second punching die head is provided with a second punching cambered surface, and the radian of the cambered surface corresponding to the second punching cambered surface is consistent with the radian of the elastic metal sheet to be formed and is formed with a cutting knife. The utility model discloses can effectively improve quality and yields of shaping cambered surface elasticity sheetmetal on the raw materials metal band.

Description

Punch forming equipment for producing elastic metal sheet of thermal protector

Technical Field

The utility model relates to an electrical apparatus protection components and parts technical field, concretely relates to stamping forming equipment for producing hot protector elastic metal piece.

Background

The thermal protector, also called a micro overheat protector, is a commonly used thermal protection element, and is mainly used for performing overheat/overcurrent protection on various motors, PCB circuit boards, electric heating products and related equipment which need to generate heat when a battery runs, and the stability and safety of the circuit and the related equipment in running can be directly influenced by the performance of the thermal protector.

The most important original piece in the existing thermal protector is an elastic metal sheet structure, the elastic metal sheet structure is usually a butterfly-shaped or long circular arc-shaped elastic metal sheet, and the elastic sheet can bounce up and down under the action of a current thermal effect to realize the disconnection of a loop when electrical equipment provided with the thermal protector is over-current or over-heat, so that the protection of the electrical equipment is realized. In the prior art, the elastic metal sheet is formed by stamping and cutting a metal belt as a raw material, the design of a stamping structure is unreasonable, the cambered surface structure of the elastic metal sheet is formed by one-step stamping, the quality and the stability of the formed elastic metal sheet are poor, secondary punching or notching is needed to conveniently carry out mechanical continuous assembly, and the yield is reduced again by the secondary punching or notching.

Disclosure of Invention

The utility model provides a technical problem provide a stamping forming equipment for producing hot protector elastic metal piece to solve the defect in the above-mentioned technical background.

The utility model provides a technical problem adopt following technical scheme to realize:

a punch forming device for producing elastic metal sheets of a thermal protector comprises a punch die head group and a base matched with the punch die head, wherein a feeding auxiliary structure for pulling a raw material metal belt is further arranged on the base; the stamping die set is sequentially provided with a first stamping die head and a second stamping die head, the first stamping die head is provided with a first stamping arc surface, the radian of the arc surface corresponding to the first stamping arc surface is 2/3-3/4 of the radian of the elastic metal sheet to be formed, and the first stamping arc surface is also provided with two-side pre-cutting knives matched with the contour lines on two sides of the elastic metal sheet to be formed; and the second stamping die head is provided with a second stamping cambered surface, the radian of the cambered surface corresponding to the second stamping cambered surface is consistent with that of the elastic metal sheet to be formed, and a cutting knife is formed at the position of the stamping cambered surface corresponding to the outer contour line of the elastic metal sheet to be formed.

As a further limitation, the elastic metal sheet to be formed is an oblong metal sheet, and the oblong metal sheet has an aspect ratio of more than or equal to 2.5 and a concave cambered surface.

The sum of the lengths of the contour lines cut on the raw material metal strip by the pre-cutting knife is 3/4-4/5 of the perimeter of the contour line of the elastic metal sheet to be formed.

As a further limitation, the feeding auxiliary structure comprises a perforating wheel and a guide wheel, perforating heads are uniformly arranged on the wheel surface of the perforating wheel and are correspondingly arranged on two sides of the path of the raw material metal belt, so that holes are punched on two sides of the advancing raw material metal belt in the rotating process of the perforating wheel, and a guide protrusion is arranged on the wheel surface corresponding to the punching position of the raw material metal belt of the guide wheel, so that the guide protrusion is clamped at the punching position of the raw material metal belt and drives the raw material metal belt to advance through the rotation of the guide wheel.

As a further limitation, the stamping structure further comprises a punching device, and the punching device is arranged at a position, to be punched, of the first stamping arc surface corresponding to the elastic metal sheet to be formed.

As a further limitation, the stamping structure further comprises a notching device, and the notching device is arranged at a position, corresponding to the elastic metal sheet to be formed, of the first stamping cambered surface to be notched.

Has the advantages that: the utility model relates to a stamping forming equipment for producing hot protector elastic metal piece can carry out stamping forming to long circle or butterfly elastic metal piece as hot protector deformation unit on the raw materials metal strip that feeds in succession, be particularly useful for stamping forming to go out long circle elastic metal piece that the aspect ratio is greater than or equal to 2.5, it can effectively solve under the traditional stamping forming mode elastic metal piece cut off not in place and the problem of cambered surface defect, can effectively improve elastic metal piece's yields and quality, make the hot protector of preparation more reliable and stable, also can improve continuous production efficiency, make it more be suitable for industry continuous production.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of a perforated portion of the perforation wheel in fig. 1.

Fig. 3 is a bottom view of the first punching arc surface in fig. 1.

FIG. 4 is a bottom view of the second punching arc surface in FIG. 1

FIG. 5 is a schematic view of the raw metal strip of FIG. 1 in a processing state.

Wherein: 1. a second material guide wheel; 2. a second stamping die; 3. a second stamped arc surface; 4. a base; 5. a first stamping die head; 6. a first stamped arc surface; 7. a die head base; 8. a first material guide wheel; 9. a raw metal strip; 10. a tapping wheel driving wheel; 11. a driven wheel of the tapping wheel; 12. opening a hole head; 13. a slot punching seat; 14. punching a hole seat; 15. a pre-cut-off cutter; 16. a cutting knife; 17. an aperture; 18. cutting off the hole; 19. a completely cut elastic metal sheet; 20. a pre-cut resilient metal sheet.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1 to 4, in the preferred embodiment of the press forming apparatus for producing an elastic metal sheet of a thermal protector, in the present embodiment, the elastic metal sheet produced by the press structure is an oblong elastic metal sheet, the oblong elastic metal sheet has an aspect ratio of not less than 2.5 and has a concave arc surface, and the raw metal strip 9 as a raw material is a thermal alloy strip, and can be deformed at a position corresponding to the concave arc surface after being heated, so that the arc surface is completely turned outwards, and thus, the metal strip can be used as a contact in a bimetallic strip structure in the thermal protector to connect with an elastic sheet. In order to facilitate the mechanized continuous production and processing, the elastic metal sheet to be processed is respectively provided with a through hole and a round blind groove at two corresponding round positions, and the through hole position is used for facilitating the thread welding rivet of the elastic metal sheet on the thermal protector; and the position of the round blind groove is convenient for welding a moving contact.

The apparatus of the embodiment shown in fig. 1 can be used for producing an elastic metal sheet having the above technical features, and uses a raw metal belt 9 as a raw material, and includes a tapping wheel, a first material guiding wheel 8, a first stamping die head 5, a second stamping die head 2 and a second material guiding wheel 1, which are sequentially arranged along the traveling direction of the raw metal belt 9, wherein the tapping wheel has a structure shown in fig. 2 and includes a tapping wheel driving wheel 10 and a tapping wheel driven wheel 11, which are oppositely arranged, a gap for the raw metal belt 9 to pass through is arranged between the tapping wheel driving wheel 10 and the tapping wheel driven wheel 11, and a plurality of tapping heads 12 are uniformly formed on the wheel surface of the tapping wheel driving wheel 10 corresponding to the two sides of the raw metal belt 9, so that holes 17 are formed on the two sides of the raw metal belt 9 by the rotation of the tapping wheel driving wheel 10 when the raw metal belt 9 passes through the tapping. The first material guide wheel 8 and the second material guide wheel 1 are respectively arranged at the feeding end and the discharging end of the first stamping die head 5 and the second stamping die head 2 and used for guiding the raw material metal belt 9, and the first material guide wheel 8 and the second material guide wheel 1 are provided with material guide bulges matched with the holes 17 so as to be clamped at the positions of the holes 17 of the raw material metal belt 9 and drive the raw material metal belt 9 to advance through self rotation.

The first stamping die head 5 and the second stamping die head 2 are respectively used for stamping a running raw material metal belt 9 and manufacturing a corresponding elastic metal sheet, the stamping working surface of the first stamping die head 5 is a first stamping arc surface 6, the structure of the first stamping arc surface 6 is shown in fig. 3, the structure comprises a concave arc surface, the radian of the concave arc surface is 2/3 of the radian of the elastic metal sheet to be formed, two pre-cutting knives 15 matched with the outer contour line of the elastic metal sheet to be processed are formed on the concave arc surface, the pre-cutting knives 15 are symmetrically arranged, and the arc length of the contour line corresponding to the two pre-cutting knives 15 is 4/5 of the perimeter of the contour line of the elastic metal sheet to be formed; meanwhile, a punching seat 13 and a punching seat 14 are respectively arranged between the pre-cut cutters 15 at two sides corresponding to the circular positions of the two circles of the contour line of the elastic metal sheet. The stamping working surface of the second stamping die head 2 is a second stamping cambered surface 3, the structure of the second stamping cambered surface 3 is shown in fig. 4, the second stamping cambered surface comprises a concave cambered surface, the radian of the concave cambered surface is consistent with that of the elastic metal sheet to be formed, and a cutting knife 16 is formed at the position of the stamping cambered surface corresponding to the outer contour line of the elastic metal sheet to be formed.

The processing state of the raw metal band 9 on the equipment is shown in fig. 5, the raw metal band 9 firstly enters the punching wheel, holes 17 are formed on two sides of the raw metal band 9 through the punching head 12 on the punching wheel driving wheel 10, then the raw metal band 9 is sent to the punching die part through the holes 17 by the first guide wheel 8, the distance is accurately controlled through the holes 17, the raw metal band 9 firstly enters the first punching die head 5 to be punched for the first time through the first punching cambered surface 6, cambered surface preforming is carried out during punching, and two-side edge cutting, notching and punching are carried out in the cambered surface preforming process, the first punching cambered surface 6 is matched through the die head base 7 correspondingly arranged on the base 4 in the edge cutting, notching and punching processes, the pre-cut elastic metal sheet 20 is obtained, the pre-cut elastic metal sheet 20 continuously enters the second punching die head 2 to be subjected to surface leveling and forming through the second punching cambered surface 3, cutting off the elastic metal sheet by the cutting knife 16, wherein the cutting knife 16 only completely cuts off the two ends of the elastic metal sheet 20 and the uncut part caused by the damage or failure of the pre-cutting knife 15, so that the generation of defective edges and dislocation in the contour line cutting process can be effectively reduced, the completely cut elastic metal sheet 19 with high edge cutting flatness is obtained, the completely cut elastic metal sheet 19 is collected through a blanking channel, and the finished elastic metal sheet is obtained after defective products are screened out; the elastic metal sheet 19 completely cut off from the raw metal belt 9 is blanked with cut-off holes having a contour corresponding to that of the elastic metal sheet 19, but there is still a large available portion which can be continuously moved by the second guide wheel 1 and recovered in the subsequent process.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes, modifications and/or alterations to the present invention may be made by those skilled in the art after reading the technical disclosure of the present invention, and all such equivalents may fall within the scope of the present invention as defined by the appended claims.

Claims

1. The punch forming equipment for producing the elastic metal sheet of the thermal protector comprises a punch die head group and a base matched with the punch die head, wherein a feeding auxiliary structure for pulling a raw metal belt is arranged on the base; and the second stamping die head is provided with a second stamping cambered surface, the radian of the cambered surface corresponding to the second stamping cambered surface is consistent with that of the elastic metal sheet to be formed, and a cutting knife is formed at the position of the stamping cambered surface corresponding to the outer contour line of the elastic metal sheet to be formed.

2. The press forming apparatus for producing an elastic metal sheet for a thermal protector according to claim 1, wherein the elastic metal sheet to be formed is an oblong metal sheet having an aspect ratio of not less than 2.5 and a concave arc surface.

3. The press forming apparatus for producing an elastic metal sheet for a thermal protector as claimed in claim 1, wherein the sum of the lengths of the contour lines cut by said pre-cut cutter on the raw material metal strip is 3/4 to 4/5 of the perimeter of the contour line of the elastic metal sheet to be formed.

4. The punch forming apparatus for manufacturing an elastic metal sheet of a thermal protector according to claim 1, wherein the feeding auxiliary structure comprises a punching wheel and a material guiding wheel, and punching heads are uniformly arranged on the wheel surface of the punching wheel and correspondingly arranged on two sides of the path of the raw metal strip, so as to punch two sides of the advancing raw metal strip during the rotation of the punching wheel; and the guide wheel is provided with a guide bulge on the wheel surface corresponding to the punching position of the raw material metal belt so as to be clamped at the punching position of the raw material metal belt and drive the raw material metal belt to advance through self rotation.

5. The press forming apparatus for producing an elastic metal sheet for a thermal protector according to claim 1, further comprising a punching device provided at a position where the first punching arc surface corresponds to a to-be-punched hole of the elastic metal sheet to be formed.

6. The stamping and forming apparatus for producing an elastic metal sheet for a thermal protector as claimed in claim 1, further comprising a notching device, wherein the notching device is disposed at a position of the first stamping arc surface corresponding to a notch to be punched in the elastic metal sheet to be formed.