CN114406110B - Pressure riveting method and pressure riveting device - Google Patents
Pressure riveting method and pressure riveting device Download PDFInfo
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- CN114406110B CN114406110B CN202210077622.9A CN202210077622A CN114406110B CN 114406110 B CN114406110 B CN 114406110B CN 202210077622 A CN202210077622 A CN 202210077622A CN 114406110 B CN114406110 B CN 114406110B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Insertion Pins And Rivets (AREA)
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Abstract
The invention relates to the technical field of press riveting, in particular to a press riveting method and a press riveting device. The method comprises the following steps: placing at least two plates to be riveted between the blank holder and the mold; a punch is arranged inside the blank holder, the blank holder is connected with a first ultrasonic transducer, and the die is provided with a groove matched with the punch; pressing the riveting positions of at least two plates to be riveted by using the blank holder and the die; enabling ultrasonic waves emitted by the first ultrasonic transducer to act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder; the ultrasonic waves emitted by the first ultrasonic transducer are vertical to the surface of the plate to be riveted, which is in contact with the blank holder; and extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted. This scheme can be favorable to in the recess of drift crowded income mould.
Description
Technical Field
The embodiment of the invention relates to the technical field of press riveting, in particular to a press riveting method and a press riveting device.
Background
For sheet metal parts (i.e., sheet materials), direct tapping conditions are not available because sheet thicknesses are typically relatively thin. The adoption of the welding mode is troublesome and has higher cost, so the riveting process appears. The press riveting process is that in the riveting process, the punch head enables the plates to generate plastic deformation under the external pressure and further extrudes the plates into a groove preset by a die to form a mechanical internal lock, so that at least two plates are firmly connected.
In order to improve the clinching quality, the clinching can be assisted by means of ultrasound. However, in the related art, the punch needs to consume more energy to extrude a part of the plate material into the groove, and the forming is difficult for some high-strength and low-plasticity materials.
Therefore, a pressing and riveting method and a pressing and riveting device are needed to solve the above technical problems.
Disclosure of Invention
The embodiment of the invention provides a press riveting method and a press riveting device, which can be beneficial to a punch to be extruded into a groove of a die.
In a first aspect, an embodiment of the present invention provides a riveting method, including:
placing at least two plates to be riveted between the blank holder and the mould; the punching head is arranged inside the blank holder, the blank holder is connected with a first ultrasonic transducer, and the die is provided with a groove matched with the punching head;
compressing the riveting positions of at least two plates to be riveted by using the blank holder and the mould;
enabling ultrasonic waves emitted by the first ultrasonic transducer to act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder; the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder;
and extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted.
In one possible design, a second ultrasonic transducer is connected to the mold;
after the pressing the riveting part of at least two sheets to be riveted by using the blank holder and the die and before the pressing the riveting part of at least two sheets to be riveted by the punch, the method further comprises the following steps:
applying ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are contacted with each other, of at least two plates to be riveted through the die; wherein, the ultrasonic wave emitted by the second ultrasonic transducer is parallel to the surfaces of at least two plates to be riveted which are contacted with each other.
In one possible design, the ultrasonic waves emitted by the first ultrasonic transducer have an action time on the surface of the sheet to be clinched in contact with the edge holder of not more than 5s.
In a possible design, after the pressing the punch to the riveting position of at least two sheets to be clinched until the groove is completely filled with the sheets to be clinched, the method further includes:
continuing to act the ultrasonic waves emitted by the first ultrasonic transducer on the surface of the sheet to be clinched, which is in contact with the blank holder, through the blank holder.
In a second aspect, an embodiment of the present invention provides a rivet pressing device, including a blank holder, a punch, a die, and a first ultrasonic transducer, where the blank holder is connected to the first ultrasonic transducer, the punch is disposed inside the blank holder, and the die is provided with a groove matched with the punch;
at least two plates to be pressed and riveted are arranged between the blank holder and the die, the blank holder and the die are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the first ultrasonic transducer act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder, and the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder.
In a third aspect, an embodiment of the present invention further provides a riveting method, including:
placing at least two plates to be riveted between the blank holder and the mould; a punch is arranged inside the blank holder, the die is connected with a second ultrasonic transducer, and the die is provided with a groove matched with the punch;
pressing the riveting positions of at least two plates to be riveted by using the blank holder and the die;
applying ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are contacted with each other, of at least two plates to be riveted through the die; wherein, the ultrasonic wave emitted by the second ultrasonic transducer is parallel to the surfaces of at least two plates to be riveted which are contacted with each other;
and extruding the riveting parts of at least two plates to be pressed and riveted by the punch until the groove is completely filled with the plates to be pressed and riveted.
In one possible design, a first ultrasonic transducer is connected to the blank holder;
after the pressing the riveting part of at least two sheets to be riveted by using the blank holder and the die and before the pressing the riveting part of at least two sheets to be riveted by the punch, the method further comprises the following steps:
enabling ultrasonic waves emitted by the first ultrasonic transducer to act on the surface of the plate to be pressed and riveted, which is in contact with the blank holder, through the blank holder; the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be pressed and riveted, which is in contact with the blank holder.
In one possible embodiment, the ultrasonic waves emitted by the second ultrasonic transducer are applied to the surfaces of at least two sheets to be clinched that are in contact with each other for a time of not more than 5 seconds.
In a possible design, after the pressing the punch to the riveting position of at least two sheets to be clinched until the groove is completely filled with the sheets to be clinched, the method further includes:
and continuing to apply the ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are contacted with each other, of at least two plates to be riveted through the die.
In a fourth aspect, an embodiment of the present invention further provides a rivet pressing device, including a blank holder, a punch, a die, and a second ultrasonic transducer, where the punch is disposed inside the blank holder, the die is connected to the second ultrasonic transducer, and the die is provided with a groove matched with the punch;
at least two plates to be pressed and riveted are arranged between the blank holder and the die, the blank holder and the die are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the second ultrasonic transducer act on the surfaces, which are in contact with each other, of the at least two plates to be riveted through the die, and the ultrasonic waves emitted by the second ultrasonic transducer are parallel to the surfaces, which are in contact with each other, of the at least two plates to be riveted.
In the embodiments provided by the first aspect and the second aspect, the ultrasonic waves emitted by the first ultrasonic transducer connected to the blank holder act on the surface of the sheet to be riveted contacting with the blank holder, so that the riveting part of the sheet to be riveted contacting with the blank holder can be softened, thereby facilitating the extrusion of the punch into the groove of the die.
In the embodiments provided by the third and fourth aspects, the ultrasonic waves emitted by the second ultrasonic transducer connected with the die are applied to the surfaces of at least two plates to be riveted, which are in contact with each other, so that the riveting part of the plates to be riveted can be softened, and the punch is facilitated to be extruded into the groove of the die; and welding of different plates to be pressed and riveted can be realized, which is beneficial to improving the connection strength of the plates to be pressed and riveted and the corrosion resistance of the plates to be pressed and riveted.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a riveting method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another riveting method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another riveting method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a clinching device according to an embodiment of the present invention.
Reference numerals:
10-a frame body;
1-blank holder;
2-a mould;
3-a first ultrasound transducer;
4-a second ultrasound transducer.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1, an embodiment of the present invention provides a riveting method, which includes the following steps:
102, pressing the riveting parts of at least two plates to be riveted by using a blank holder and a mould;
104, enabling ultrasonic waves emitted by the first ultrasonic transducer to act on the surface of the plate to be pressed and riveted, which is in contact with the blank holder, through the blank holder; the ultrasonic waves emitted by the first ultrasonic transducer are vertical to the surface of the plate to be pressed and riveted, which is in contact with the blank holder;
and step 106, extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted.
In the related art, the ultrasonic waves are usually applied to the lower surface of the lower plate (i.e., the outer surface of the plate away from the punch), which results in a large energy loss when the ultrasonic waves are transmitted to the upper surface of the upper plate (i.e., the outer surface of the plate close to the punch), which is not favorable for the punch to be squeezed into the recess of the die.
In the embodiment, the ultrasonic waves emitted by the first ultrasonic transducer connected with the blank holder act on the surface of the plate to be riveted, which is in contact with the blank holder, so that the riveting part of the plate to be riveted, which is in contact with the blank holder, can be softened, and the punch can be favorably extruded into the groove of the die.
It should be noted that, in order to ensure the quality of the clinching, the clinching thickness (i.e. the sum of the thicknesses of at least two sheets to be clinched) needs to be limited within 12 mm.
The ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be pressed and riveted, which is in contact with the blank holder, so that the first ultrasonic transducer mainly plays a role in ultrasonic-assisted metal forming. Of course, those skilled in the art will appreciate that the ultrasonic transducer is part of an ultrasonic vibration system, wherein the ultrasonic vibration system includes an ultrasonic generator, an ultrasonic transducer, and a horn. Specifically, the ultrasonic generator converts a power frequency current with a certain frequency into a resonant current with a certain frequency, the resonant current is transmitted to the ultrasonic transducer through an inverse piezoelectric effect, the ultrasonic transducer converts the resonant current into high-frequency vibration, the amplitude transformer amplifies the high-frequency vibration and transmits the high-frequency vibration to the punch, and the punch is enabled to realize the high-frequency vibration in the vertical direction. The plate to be pressed and riveted is placed on a die fixed with a base of the press machine, and the punch is driven by a motor of the press machine to generate extrusion force while vibrating at high frequency, so that the ultrasonic vibration assisted plastic forming process is completed.
It should be noted that the ultrasonic wave of the related art does not act on the blank holder, but acts on the punch through the amplitude transformer, and during the extrusion process of the punch, the surface of the sheet material is not softened by the ultrasonic wave, so that the punch is not favorably extruded into the groove of the die. In the embodiment provided by the invention, the amplitude transformer of the ultrasonic vibration system and the blank holder of the press machine are combined into a whole, namely, the ultrasonic wave emitted by the ultrasonic transducer directly acts on the blank holder, so that the riveting part of the plate (namely the periphery of the position where the punch reaches the plate) can be softened by means of the blank holder, and the punch can be favorably extruded into the groove.
In the process of forming the above material, effects such as stress reduction, improvement of deformation limit, reduction of surface roughness, and the like can be achieved by applying ultrasonic vibration to the plate material. Specifically, the ultrasonic transducer vibrates at a constant frequency and amplitude, and therefore the binder also mechanically vibrates at a constant frequency and amplitude. The vibration of the edge pressing ring in the loading process can cause small-amplitude periodic unloading and loading phenomena, so that the stress periodically fluctuates, and a stress superposition effect is formed. The unloading behavior under the effect of the stress superposition results in a reduction in the material mean stress. In addition, ultrasonic vibration may promote the development of crystal defects. That is, crystal defects such as vacancies, dislocations, etc. may absorb ultrasonic energy during ultrasonic loading, stimulating dislocation propagation movement, and may also cause stress reduction.
In addition, it should be noted that in the related art, the sheet is horizontally placed on the mold, while in the present embodiment, the sheet may be vertically placed between the mold and the blankholder, and the mold and the blankholder clamp the sheet before the ultrasonic vibration system is started. After the ultrasonic vibration system is started, since the amplitude of the blankholder is very small and the frequency is very high, it can be considered that the blankholder and the die are continuously kept in a pressing state on the sheet material during the application of the ultrasonic wave, that is, the sheet material does not move relative to the die and the blankholder.
In some embodiments, a second ultrasonic transducer is connected to the mold;
after step 102 and before step 106, further comprising:
the ultrasonic waves emitted by the second ultrasonic transducer act on the surfaces, which are contacted with each other, of at least two plates to be riveted through a die; wherein the ultrasonic wave emitted by the second ultrasonic transducer is parallel to the surfaces of the at least two plates to be riveted which are contacted with each other.
In the embodiment, the ultrasonic waves emitted by the second ultrasonic transducer connected with the die act on the surfaces of at least two plates to be riveted, which are in contact with each other, so that the riveting part of the plates to be riveted can be softened, and the punch is favorably extruded into the groove of the die; and welding of different plates to be pressed and riveted can be realized, which is beneficial to improving the connection strength of the plates to be pressed and riveted and the corrosion resistance of the plates to be pressed and riveted.
The ultrasonic wave emitted by the second ultrasonic transducer is parallel to the surfaces of at least two plates to be riveted which are contacted with each other, so the second ultrasonic transducer mainly plays a role of ultrasonic metal welding. Of course, those skilled in the art will appreciate that the ultrasonic transducer is part of an ultrasonic vibration system, wherein the ultrasonic vibration system includes an ultrasonic generator, an ultrasonic transducer, and a horn. Specifically, the ultrasonic generator converts a power frequency current with a certain frequency into a resonant current with a certain frequency, the resonant current is transmitted to the ultrasonic transducer through an inverse piezoelectric effect, the ultrasonic transducer converts the resonant current into high-frequency vibration, and the amplitude transformer amplifies the high-frequency vibration. In ultrasonic metal welding, the amplitude transformer transmits high-frequency vibration to the surfaces of the plates from the tangential direction, so that the surfaces in contact between two adjacent plates generate relative friction to realize the effect of metal welding. From the perspective of ultrasonic metal welding, the die corresponds to a lower sonotrode and the binder ring corresponds to an upper sonotrode, wherein the upper sonotrode and the lower sonotrode are well known to those skilled in the art and will not be described in detail herein.
In some embodiments, the ultrasonic waves emitted by the first ultrasonic transducer are applied to the surface of the panel to be clinched in contact with the blankholder for a time not exceeding 5s.
This is because the ultrasonic wave is usually within 5s (even within 1 s) to generate softening effect on the surface of the sheet material, and this increase of the action time does not further increase the softening effect of the sheet material, but rather causes the ultrasonic transducer to generate heat and waste energy, so that the action time is set to be not more than 5s. Preferably, the action time does not exceed 1s.
In some embodiments, after step 106, the clinching method further comprises:
and continuing to apply the ultrasonic waves emitted by the first ultrasonic transducer to the surface of the plate to be pressed and riveted, which is in contact with the blank holder, through the blank holder.
After the punch is squeezed into the groove, the plate can rebound a little, and in order to ensure the riveting quality, the punch is usually required to keep pressure. In this embodiment, the pressing and riveting quality of the sheet material can be further improved by continuing to turn on the first ultrasonic transducer so that the ultrasonic waves act on the surface of the sheet material to be pressed and riveted, which is in contact with the blank holder, through the blank holder.
In some embodiments, the time for which the first ultrasonic transducer is again active may be set to not more than 3s.
This is because the ultrasonic wave is usually within 3s (even within 1 s) just can guarantee the riveting quality of panel (i.e. avoid the resilience influence of panel), and this increase of action time can not further improve the riveting quality of panel, can lead to ultrasonic transducer to generate heat and the waste of energy on the contrary, therefore this action time sets up to be no more than 3s. Preferably, the action time does not exceed 1s.
In some embodiments, the ultrasonic waves emitted by the second ultrasonic transducer are applied to the surface of the at least two sheets to be clinched in contact with each other for a time not exceeding 5s.
This is because the ultrasonic wave is usually within 5s (even within 1 s) to generate softening effect on the surface of the sheet material, and this increase of the action time does not further improve the softening effect of the sheet material, but rather causes the heat generation of the ultrasonic transducer and the waste of energy, so the action time is set to be not more than 5s. Preferably, the action time does not exceed 1s.
In some embodiments, after step 106, the clinching method further comprises:
and continuing to apply the ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are contacted with each other, of the at least two plates to be riveted through the die.
After the punch is squeezed into the groove, the plate can rebound a little, and in order to ensure the riveting quality, the punch is usually required to keep pressure. In this embodiment, the riveting quality of the sheet material can be further improved by continuously turning on the second ultrasonic transducer so that ultrasonic waves act on the surfaces of the at least two sheet materials to be riveted, which are in contact with each other, through the die.
In some embodiments, the second ultrasound transducer may be re-activated for no more than 3 seconds.
This is because the ultrasonic wave usually can guarantee the clinching quality of panel (i.e. avoid the resilience influence of panel) within 3s (even within 1 s), and this increase of action time can not further improve the clinching quality of panel, can lead to ultrasonic transducer to generate heat and waste of energy on the contrary, therefore this action time sets up to be no more than 3s. Preferably, the action time does not exceed 1s.
The embodiment of the invention also provides a press riveting device which comprises a blank holder, a punch, a die and a first ultrasonic transducer, wherein the blank holder is connected with the first ultrasonic transducer, the punch is arranged inside the blank holder, and the die is provided with a groove matched with the punch;
at least two plates to be pressed and riveted are arranged between the blank holder and the die, the blank holder and the die are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the first ultrasonic transducer act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder, and the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder.
In some embodiments, the ultrasonic imaging device further comprises a second ultrasonic transducer, and the mold is connected with the second ultrasonic transducer;
the ultrasonic waves emitted by the second ultrasonic transducer act on the surfaces, which are in contact with each other, of the at least two plates to be riveted through the die, and the ultrasonic waves emitted by the second ultrasonic transducer are parallel to the surfaces, which are in contact with each other, of the at least two plates to be riveted.
In some embodiments, the ultrasonic waves emitted by the first ultrasonic transducer are applied to the surface of the panel to be clinched in contact with the blankholder for a time not exceeding 5s.
In some embodiments, the ultrasonic waves emitted by the second ultrasonic transducer are applied to the surface of the at least two sheets to be clinched in contact with each other for a time not exceeding 5s.
It can be understood that the rivet pressing device provided in the first embodiment and the rivet pressing method provided in the first embodiment are implemented based on the same inventive concept, and therefore, the two have the same beneficial effects, and the beneficial effects of the rivet pressing device provided in the first embodiment are not described herein again.
Example two
As shown in fig. 2, an embodiment of the present invention further provides a riveting method, where the method includes:
202, compressing riveting parts of at least two plates to be riveted by using a blank holder and a mould;
and step 206, extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted.
In the embodiment, the ultrasonic waves emitted by the second ultrasonic transducer connected with the die act on the surfaces of at least two plates to be riveted, which are in contact with each other, so that the riveting part of the plates to be riveted can be softened, and the punch is favorably squeezed into the groove of the die; and welding of different plates to be pressed and riveted can be realized, which is beneficial to improving the connection strength of the plates to be pressed and riveted and the corrosion resistance of the plates to be pressed and riveted.
In some embodiments, a first ultrasonic transducer is connected to the blankholder;
after step 102 and before step 106, further comprising:
enabling ultrasonic waves emitted by the first ultrasonic transducer to act on the surface of the plate to be pressed and riveted, which is in contact with the blank holder, through the blank holder; the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder.
In this embodiment, the ultrasonic waves emitted by the first ultrasonic transducer connected with the blank holder act on the surface of the plate to be riveted contacting with the blank holder, so that the riveting part of the plate to be riveted contacting with the blank holder can be softened, thereby facilitating the extrusion of the punch into the groove of the die.
In some embodiments, the ultrasonic waves emitted by the second ultrasonic transducer are applied to the surface of the at least two sheets to be clinched in contact with each other for a time not exceeding 5s.
In some embodiments, after step 106, the clinching method further comprises:
and continuing to apply the ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are contacted with each other, of the at least two plates to be riveted through the die.
In some embodiments, the second ultrasound transducer may be re-activated for no more than 3 seconds.
In some embodiments, the ultrasonic waves emitted by the first ultrasonic transducer are applied to the surface of the panel to be clinched in contact with the blankholder for a time not exceeding 5s.
In some embodiments, after step 106, the clinching method further comprises:
and continuing to apply the ultrasonic waves emitted by the first ultrasonic transducer to the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder.
In some embodiments, the time for which the first ultrasonic transducer is again active may be set to not more than 3s.
It can be understood that, for the beneficial effects and analysis corresponding to each implementation of the rivet pressing method provided in the second embodiment, reference is made to the description of the rivet pressing method in the first embodiment, which is not repeated herein.
The embodiment of the invention also provides a riveting device, which comprises a blank holder, a punch, a die and a second ultrasonic transducer, wherein the punch is arranged in the blank holder, the die is connected with the second ultrasonic transducer, and the die is provided with a groove matched with the punch;
at least two plates to be pressed and riveted are arranged between the blank holder and the die, the blank holder and the die are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the second ultrasonic transducer act on the surfaces, which are in contact with each other, of the at least two plates to be riveted through the die, and the ultrasonic waves emitted by the second ultrasonic transducer are parallel to the surfaces, which are in contact with each other, of the at least two plates to be riveted.
In some embodiments, the ultrasonic imaging system further comprises a first ultrasonic transducer, wherein the blank holder is connected with the first ultrasonic transducer;
the ultrasonic waves emitted by the first ultrasonic transducer act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder, and the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder.
In some embodiments, the ultrasonic waves emitted by the second ultrasonic transducer are applied to the surface of the at least two sheets to be clinched in contact with each other for a time not exceeding 5s.
In some embodiments, the ultrasonic waves emitted by the first ultrasonic transducer are applied to the surface of the panel to be clinched in contact with the blankholder for a time not exceeding 5s.
It can be understood that the press riveting device provided by the second embodiment and the press riveting method provided by the second embodiment are realized based on the same inventive concept, and therefore, the two have the same beneficial effects, and the beneficial effects of the press riveting device provided by the second embodiment are not described herein again.
EXAMPLE III
As shown in fig. 3, an embodiment of the present invention further provides a riveting method, where the method includes:
302, pressing the riveting parts of at least two plates to be riveted by using a blank holder and a mould;
308, extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted;
and step 312, continuing to apply the ultrasonic waves emitted by the second ultrasonic transducer to the surfaces, which are in contact with each other, of the at least two plates to be clinched through the die.
It is understood that step 304 and step 306 may be performed simultaneously or sequentially; step 310 and step 312 may be performed simultaneously or sequentially.
As shown in fig. 4, an embodiment of the present invention further provides a rivet pressing device, which includes a frame body 10, and a blank holder 1, a mold 2, a first ultrasonic transducer 3, and a second ultrasonic transducer 4, which are disposed on the frame body 10, wherein:
the blank holder 1 is connected with the first ultrasonic transducer 3, a punch (not shown in the figure) is arranged inside the blank holder 1, the die 2 is connected with the second ultrasonic transducer 4, and the die 2 is provided with a groove (not shown in the figure) matched with the punch;
at least two plates to be pressed and riveted (not shown in the figure) are arranged between the blank holder 1 and the die 2, the blank holder 1 and the die 2 are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the first ultrasonic transducer 3 act on the surface of the plate to be riveted, which is in contact with the blank holder 1, through the blank holder 1, and the ultrasonic waves emitted by the first ultrasonic transducer 3 are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder 1;
the ultrasonic waves emitted by the second ultrasonic transducer 4 act on the surfaces of the at least two plates to be riveted, which are in contact with each other, through the die 2, and the ultrasonic waves emitted by the second ultrasonic transducer 4 are parallel to the surfaces of the at least two plates to be riveted, which are in contact with each other.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A method of clinching, comprising:
placing at least two plates to be riveted between the blank holder and the mold; the punching head is arranged inside the blank holder, the blank holder is connected with a first ultrasonic transducer, the die is provided with a groove matched with the punching head, and the die is connected with a second ultrasonic transducer;
pressing the riveting positions of at least two plates to be riveted by using the blank holder and the die;
the ultrasonic waves emitted by the first ultrasonic transducer act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder so as to soften the riveting part of the plate to be riveted, which is in contact with the blank holder, and therefore the punch is favorably extruded into the groove of the die; the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder;
the ultrasonic waves emitted by the second ultrasonic transducer act on the surfaces, which are in contact with each other, of at least two plates to be riveted through the die, so that the second ultrasonic transducer plays a role in ultrasonic metal welding, and the corrosion resistance of the plates to be riveted is improved; the ultrasonic waves emitted by the second ultrasonic transducer are parallel to the surfaces of the at least two plates to be riveted which are in contact with each other, the action time of the ultrasonic waves emitted by the second ultrasonic transducer on the surfaces of the at least two plates to be riveted which are in contact with each other is not more than 1s, the die is equivalent to a lower sonotrode from the angle of ultrasonic metal welding, and the blank holder is equivalent to an upper sonotrode;
extruding the riveting parts of at least two plates to be riveted by the punch until the grooves are completely filled with the plates to be riveted;
continuously acting the ultrasonic waves emitted by the second ultrasonic transducer on the surfaces, which are contacted with each other, of at least two plates to be riveted through the die; wherein the second ultrasonic transducer is not active again for more than 1s.
2. The clinching method of claim 1, wherein the action time of the ultrasonic waves emitted by the first ultrasonic transducer on the surface of the panel to be clinched in contact with the clincher does not exceed 5s.
3. A clinching method according to any one of claims 1-2, wherein after the punch is pressed against the clinched portion of at least two sheets to be clinched until the recess is completely filled with the sheets to be clinched, the method further comprises:
continuing to act the ultrasonic waves emitted by the first ultrasonic transducer on the surface of the sheet to be clinched, which is in contact with the blank holder, through the blank holder.
4. A riveting device, which is applied to the riveting method of any one of claims 1-3, and comprises a blank holder, a punch, a die and a first ultrasonic transducer, wherein the blank holder is connected with the first ultrasonic transducer, the punch is arranged inside the blank holder, and the die is provided with a groove matched with the punch;
at least two plates to be pressed and riveted are arranged between the blank holder and the die, the blank holder and the die are used for pressing the riveting parts of the at least two plates to be pressed and riveted, and the punch is used for extruding the riveting parts of the at least two plates to be pressed and riveted;
the ultrasonic waves emitted by the first ultrasonic transducer act on the surface of the plate to be riveted, which is in contact with the blank holder, through the blank holder, and the ultrasonic waves emitted by the first ultrasonic transducer are perpendicular to the surface of the plate to be riveted, which is in contact with the blank holder.
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| US20180126445A1 (en) * | 2016-11-10 | 2018-05-10 | GM Global Technology Operations LLC | Hybrid workpiece joining |
| US20200101519A1 (en) * | 2018-09-28 | 2020-04-02 | Ut-Battelle, Llc | Ultrasonically Assisted Self-Piercing Riveting |
| CN109693402B (en) * | 2018-12-28 | 2020-04-14 | 燕山大学 | Riveting-free stamping vibration connection method and die for carbon fiber composite material and aluminum alloy material |
| CN109821992B (en) * | 2019-04-11 | 2024-04-16 | 吉林大学 | Rivet-free riveting forming device under ultrasonic wave and high temperature effects and control method |
| CN111660002B (en) * | 2020-06-12 | 2021-05-18 | 中南大学 | Spinning friction type ultrasonic lock brazing butt joint device and method |
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