CN110899498A

CN110899498A - Movable reverse rivetless riveting die

Info

Publication number: CN110899498A
Application number: CN201911141809.5A
Authority: CN
Inventors: 唐斯琪; 李嘉赓; 姚进
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-03-24

Abstract

The invention discloses a movable reverse rivetless riveting die. The method is characterized in that: comprises a male die, a movable blank holder and a female die capable of reversely punching; a reverse limiting boss is arranged on the male die, and can be matched with a boss on a movable slide block of the blank holder to limit the upward movement of the male die in a reverse riveting stage; the movable blank holder comprises a blank holder disc, a guide groove and a movable sliding block, wherein a boss is arranged on the movable sliding block, and the movable blank holder can be matched with a reverse limiting boss on the male die in a reverse riveting stage to limit the upward movement of the male die; the reverse-stamping female die comprises a fixed female die and a T-shaped movable female die, wherein a stepped hole is formed in the fixed female die, a stamping cavity similar to the traditional rivet-free riveting is formed at the top of a ring-shaped groove of the T-shaped movable female die, a material flows into the cavity in the first riveting link, a riveting joint is formed, and the downward movement of the T-shaped movable female die is limited; the movable reverse rivetless riveting die can be used for riveting and directly carrying out reverse secondary punching.

Description

Movable reverse rivetless riveting die

Technical Field

The invention relates to the technical field of stamping, in particular to a rivet-free riveting die.

Background

The rivet-free riveting is a method widely applied to connection of different materials at present, in the rivet-free riveting process, holes do not need to be punched in advance, other accessories do not need to be added, and the connection is realized by forming a mechanical interlocking structure through plastic flow of materials of an upper plate and a lower plate, so that the development trend of light-weight production at present is met. The strength of a riveted joint is a key performance index influencing the rivet-free riveting connection strength, and the plastic deformation of upper and lower plates and the interlocking degree between the plates are enhanced by changing a die, so that the method is a universal method adopted by scholars at home and abroad at present. Meanwhile, the interlocking degree of the riveting joint formed by the traditional rivet-free riveting mode is insufficient, the formed riveting joint needs large stamping force, and meanwhile, the riveting joint is too high and is inconvenient for subsequent assembly. The common method for solving the problem at present is to change a set of new die for secondary stamping, so that the plastic flow of the material is enhanced, the interlocking degree between an upper plate and a lower plate is improved, but the working procedure is complex, the operation is complex, and the positioning difficulty is increased.

Disclosure of Invention

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a movable reverse rivetless riveting die.

The technical scheme adopted by the invention is as follows:

a movable reverse rivetless riveting die comprises a male die, a movable blank holder and a reverse punching female die; a reverse limiting boss is arranged on the male die, and can be matched with a boss on a movable slide block of the blank holder to limit the upward movement of the male die in a reverse riveting stage; the movable blank holder comprises a blank holder disc, a guide groove and a movable sliding block, wherein a boss is arranged on the movable sliding block, and the movable blank holder can be matched with a reverse limiting boss on the male die in a reverse riveting stage to limit the upward movement of the male die; the reverse-stamping female die comprises a fixed female die and a T-shaped movable female die, a stepped hole is formed in the fixed female die, a stamping die cavity similar to the traditional rivet-free riveting is formed at the top of a ring-shaped groove of the T-shaped movable female die, in the first riveting link, material flows into the die cavity, a riveting joint is formed, downward movement of the T-shaped movable female die is limited, the ring-shaped groove at the top of the T-shaped movable female die and an inner groove of the fixed female die form the stamping die cavity, and in the first riveting link, the material flows into the die cavity, and the riveting joint.

Compared with the prior art, the movable reverse riveting die has the beneficial effect that the movable reverse riveting die can be used for riveting and directly carrying out reverse secondary stamping.

Drawings

FIG. 1 is a schematic illustration of a movable reverse rivetless riveting die riveting process;

FIG. 2 is a schematic view of a male die descending link of a movable reverse rivetless riveting die;

FIG. 3 is a schematic view of the upward movement of the male die of a movable reverse rivetless riveting die and its reverse orientation;

FIG. 4 is a schematic diagram of a movable reverse riveting die with a T-shaped movable female die for reverse punching;

FIG. 5 is a schematic view of a movable reverse rivetless riveting die blank holder bottom configuration;

the parts in the drawings are numbered as follows: 1. a male die; 12. a reverse limiting boss; 2. the movable blank holder; 22. a blank holder disk; 23 a movable slide; 232. a boss; 24. a guide groove; 3. is connected with the upper plate; 4. is connected to the lower plate; 5. the female die can be punched reversely; 51. fixing the female die; 52. the T-shaped movable female die.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following are preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and concepts according to the present invention should be equally replaced or changed within the technical scope of the present invention.

As shown in FIG. 1, an upper plate 3 to be connected and a lower plate 4 to be connected are stacked above a female die 5 capable of reverse punching, the stacked plates to be connected are pressed by a movable blank holder 2, and a male die 1 is inserted through an inner hole of the blank holder 2 and placed above the stacked plates to be connected. As shown in figure 2, the punch 1 descends to be connected in a rivet-free riveting mode similar to the traditional mode, the connected plates flow into a stamping cavity formed by the top of the T-shaped movable female die 52 and an inner groove of the fixed female die 51, and the reverse limiting boss 12 on the punch 1 descends along with the punch 1, but is higher than the formed riveting joint and lower than the bottom of the boss 232 on the movable slide block 23 of the movable blank holder 2. As shown in fig. 3, the movable slide 23 is driven while moving radially along the guide groove 24, stopping when approaching the outer surface of the punch 1. Then the male die 1 moves upwards, the reverse limiting boss 12 on the male die is overlapped with the boss 232 on the movable sliding block 2, the male die cannot move upwards continuously, a reverse stamping cavity is formed between the bottom of the male die 1 and the riveting joint at the moment, as shown in fig. 4, when the ring is stamped reversely, the T-shaped movable female die 52 moves upwards to push the connected materials at the riveting joint to flow plastically and enter the reverse stamping cavity, direct reverse riveting is realized, the plastic flow of the riveting joint is enhanced, the interlocking degree between the upper plate and the lower plate is increased, the height of the riveting joint is effectively reduced, and the subsequent assembly of the combined workpiece is facilitated.

Claims

1. The utility model provides a portable reverse no rivet riveting mould which characterized in that: comprises a male die (1), a movable blank holder (2) and a female die (5) capable of reversely punching; corresponding driving devices are respectively arranged on the male die (1), the movable blank holder (2) and the reverse punching female die (5); a reverse limiting boss (12) is arranged on the male die (1), and can be matched with a boss (232) on a movable sliding block (23) of the blank holder (2) to limit the upward movement of the male die (1) in a reverse riveting stage; the movable blank holder (2) comprises a blank holder disc (22), a guide groove (24) and a movable sliding block (23), the movable sliding block (23) can move along the guide groove (24) in the radial direction under the driving action, a boss (232) is arranged on the movable sliding block (23), and the movable blank holder can be matched with a reverse limiting boss (12) on the male die (1) in the reverse riveting stage to limit the upward movement of the male die (1); the reverse-stamping female die (5) comprises a fixed female die (51) and a T-shaped movable female die (52), a stepped hole is formed in the fixed female die (51), a stamping cavity similar to the traditional rivet-free riveting is formed at the top of a ring-shaped groove of the T-shaped movable female die (52), a material flows into the cavity in a first riveting link, a riveting joint is formed, downward movement of the T-shaped movable female die (52) is limited, the ring-shaped groove at the top of the T-shaped movable female die (52) and the inner groove of the fixed female die (51) form the stamping cavity, and the material flows into the cavity in the first riveting link to form the riveting joint; the movable reverse riveting die can be used for riveting to directly perform reverse secondary punching.

2. A movable reverse rivetless riveting die according to claim 1 wherein: the riveting link is carried out in two steps, wherein the first step of stamping forms a joint similar to the traditional rivet-free riveting; the second step reverse stamping link is started from the end of the first step stamping, the process does not need to replace a die, the movable sliding block (23) positioned in the guide groove (24) of the blank holder (2) moves towards the middle along the radial direction through the driving device, the male die (1) moves upwards, the reverse limiting boss (12) on the male die (1) is matched with the boss (232) on the movable sliding block of the blank holder (2) to limit the upward movement of the male die (1), and the T-shaped movable female die (52) moves upwards to realize reverse stamping.