Sheet Metal Flanging Machine

Abstract

The invention discloses a sheet metal flanging device, wherein the lower end of the ejector spring is against the lower end wall of the shell; the punch shaft of the punch is inserted into the ejector spring, and the lower end is located in the center of the lower end wall of the shell; the circular plate head of the punch is pressed on the upper end of the ejector spring; the punch ejector is located directly above the circular plate head of the punch; the lower end of the compression spring is fixed to the punch ejector, and the upper end is fixed to the ejector connecting rod plate; the lower end of the ejector connecting shaft is fixed to the ejector connecting rod plate, and the upper end passes through the upper end wall of the shell and is fixed to the button; the left and right ends of the ejector connecting rod plate are respectively provided with guide grooves; the upper parts of the two connecting rods are respectively pivotally fixed to the inner walls on both sides of the upper part of the shell; the middle part of the connecting rod forms an inclined surface, and the lower end forms a hook claw that extends inward; in a natural state, the guide grooves at the left and right ends of the ejector connecting rod plate are respectively clamped on the upper parts of the inclined surfaces of the two connecting rods; the hook claws at the lower ends of the two connecting rods are respectively hooked on the lower side edge parts of the circular plate-shaped linkage part of the punch ejector. The sheet metal flanging device has a compact structure and is easy to carry and use.

Description

Technical Field

[0001] The invention relates to a sheet metal tool, in particular to a sheet metal flanging device. Background Art

[0002] In the production and processing of sheet metal parts, there are mainly the following methods for processing threaded holes on sheet metal parts:

[0003] (I) Use a CNC punching machine with a die to flanging the sheet metal, and then use a drill press to tap. This method is suitable for industrial mass processing, but some smaller companies may not be equipped with sheet metal flanging dies. They can only punch holes in the sheet metal with a punching machine, and then use the riveting nut or spot welding nut process, which increases the process flow and materials, and correspondingly increases the company's operating costs.

[0004] (ii) Use a pneumatic riveting machine to press the rivet nuts. This method is suitable for plates processed by punching or laser, and needs to be used in conjunction with the bending process. When designing a product, it may happen that the hole position cannot meet the processing range of the riveting machine, or the riveting process conflicts with the bending process, which is not conducive to product design and product processing.

[0005] (III) Spot welding nuts. For holes that cannot be flanging or riveted with a rivet machine, spot welding nuts are usually used. However, because the nuts are small, the welding process cannot ensure the welding position of the nuts well, and the welding slag generated during welding may block the holes or affect the shape of the sheet metal parts, which is not conducive to production and processing.

[0006] In the process of product development, it is usually necessary to make multiple prototypes. The speed and quality of prototype production are related to the progress of the project and the performance test of the product. Prototyping is different from mass production. The use of processing equipment is related to production costs. For the characteristics of small number and large variety of prototypes, small processing equipment can be used for processing, which can save time cost and equipment use and maintenance costs. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a sheet metal flanging device which has a compact structure and is easy to carry and use.

[0008] In order to solve the above technical problems, the present invention provides a sheet metal flanging device, which includes a housing 1, an ejector spring 21, a compression spring 22, a punch 3, a punch ejector 4, an ejector connecting rod plate 5, an ejector connecting shaft 52, a button 6, and a connecting rod 7;

[0009] The ejector spring 21 and the compression spring 22 are both helical springs;

[0010] The lower end wall of the housing 1 is annular;

[0011] The outer diameter of the ejector spring 21 is larger than the inner diameter of the lower end wall of the housing 1;

[0012] The punch 3 comprises a circular plate head and a punch shaft coaxially combined together;

[0013] The outer diameter of the circular plate head is larger than the outer diameter of the ejector spring 21;

[0014] The maximum outer diameter of the punch shaft is smaller than the inner diameter of the ejector spring 21;

[0015] The ejector spring 21 is placed in the housing 1, and its lower end abuts against the lower end wall of the housing 1;

[0016] The punch shaft of the punch 3 is inserted into the ejector spring 21, and the lower end of the punch shaft is located at the center of the lower end wall of the housing 1;

[0017] The circular plate head of the punch 3 is pressed on the upper end of the ejector spring 21;

[0018] The punch pin 4 comprises a circular plate-shaped linkage portion and a cylindrical impact portion coaxially combined together;

[0019] The outer diameter of the circular plate-shaped linkage part is greater than the outer diameter of the cylindrical impact part;

[0020] The cylindrical impact portion of the punch ejector pin 4 is located directly above the circular plate head of the punch 3;

[0021] The lower end of the compression spring 22 is fixed to the central position of the upper side of the circular plate-shaped linkage part of the punch ejector 4, and the upper end is fixedly connected to the central position of the lower side of the ejector connecting rod plate 5;

[0022] The lower end of the ejector connecting shaft 52 is fixed to the center position of the upper side of the ejector connecting rod plate 5;

[0023] The upper end of the ejector connecting shaft 52 passes through the upper end wall of the housing 1 and is fixed to the button 6;

[0024] The left and right ends of the ejector connecting rod plate 5 are respectively provided with guide grooves 51;

[0025] The upper parts of the two connecting rods 7 are respectively pivotally fixed to the connecting rod shaft holes 11 arranged on the inner walls of both sides of the upper part of the housing 1 through the connecting rod pins 73;

[0026] The middle part of the connecting rod 7 is formed with an inclined surface 71 which gradually bulges inward from top to bottom;

[0027] The lower end of the connecting rod 7 is formed with a hook 72 extending inward;

[0028] In the natural state, the guide grooves 51 at the left and right ends of the ejector connecting rod plate 5 are respectively clamped on the upper parts of the inclined surfaces 71 of the two connecting rods 7; the hook claws 72 at the lower ends of the two connecting rods 7 are respectively hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector 4.

[0029] Preferably, the sheet metal flanging device further comprises a button spring 23;

[0030] The button spring 23 is sleeved outside the ejector connecting shaft 52;

[0031] The lower end of the button spring 23 is fixed to the upper side of the ejector link plate 5 , and the upper end is fixed to the lower side of the upper end wall of the housing 1 .

[0032] Preferably, the sheet metal flanging device further includes a connecting rod spring 24;

[0033] The connecting rod spring 24 is a coil spring;

[0034] One end of the connecting rod spring 24 abuts against the upper inner wall of the housing 1 , and the other end abuts against the upper rear side of the connecting rod 7 and is located above the connecting rod pin 73 .

[0035] Preferably, the upper and lower ends of the compression spring 22 are respectively welded and fixed to the circular plate-shaped linkage part connecting the ejector connecting rod plate 5 and the punch ejector 4;

[0036] The upper and lower ends of the button spring 23 are respectively welded and fixed to the lower side surface of the upper end wall of the housing 1 and the upper side surface of the ejector connecting rod plate 5.

[0037] Preferably, the housing 1 is composed of two left and right pieces that are buckled together and fastened with bolts.

[0038] Preferably, the sheet metal flanging device further comprises a concave die 9;

[0039] The die 9 is provided with a flanging die hole 911 adapted to the punch shaft of the punch 3 .

[0040] Preferably, the punch shaft of the punch 3 is in N-step shape with the outer diameter gradually decreasing from top to bottom, where N is a positive integer;

[0041] The die 9 is provided with N+1 types of flanging die hole positions 911 adapted to different outer diameters of the punch shaft of the punch 3 .

[0042] Preferably, the die 9 comprises a die base 90 and a combined die 91;

[0043] The combined die 91 is provided with N+1 types of flanging die hole positions 911;

[0044] The upper end surface of the die base 90 is provided with N+1 types of raised shafts 901;

[0045] The lower end of the die spring 92 is fixed to the raised shaft 901 of the die base 90 , and the die spring 92 passes through the corresponding flanging die hole 911 of the combined die 91 , and the upper end is fixed to the washer 921 .

[0046] Preferably, the die base 90 and the combined die 91 are fastened together using bolts;

[0047] The lower end of the die spring 92 is welded and fixed to the raised shaft 901 of the die base 90 , and the upper end is welded and fixed to the washer 921 .

[0048] Preferably, N is 1, 2, 3 or 4.

[0049] Preferably, the sheet metal flanging device further comprises an adjustable support seat 8;

[0050] The adjustable support seat 8 is in the shape of a circular tube;

[0051] The tube wall of the adjustable support seat 8 is provided with an axial connecting groove 81 and a plurality of circumferential notches 82 arranged vertically, and the ends of the same side of the plurality of circumferential notches 82 are all connected to the connecting groove 81;

[0052] The distance between adjacent circumferential notches is adapted to the height of the corresponding steps of the punch axis of the punch 3;

[0053] A fixing pin 13 is provided on the outer side of the lower part of the housing 1;

[0054] The inner diameter of the adjustable support seat 8 is adapted to the outer diameter of the bottom of the shell 1, and is used to be mounted outside the bottom of the shell 1. By allowing the fixed pin shaft 13 to enter different circumferential grooves 82, the distance from different steps of the punch shaft to the upper side of the sheet metal part is adjusted.

[0055] Preferably, a scale line is provided above the fixing pin 13 on the outer side surface of the bottom of the housing 1 to facilitate the position alignment when the adjustable support seat 8 is rotated to allow the fixing pin 13 to enter the corresponding circumferential notch 82 .

[0056] The sheet metal flanging device of the present invention, in a natural state, does not apply pressure to the button 6, the compression spring 22 is in a stretched state, and the hook claws 72 at the lower ends of the two connecting rods 7 are respectively hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector 4, restricting the punch ejector 4 from moving downward, and does not apply impact pressure to the punch 3. Figure 3As shown, when downward pressure is applied to the button 6, the ejector connecting shaft 52 drives the ejector link plate 5 to move downward, so that the compression spring 22 is gradually compressed and deformed. When the ejector link plate 5 moves down to the inclined surface 71 in the middle of the connecting rod 7, the guide grooves 51 at the left and right ends of the ejector link plate 5 will push the connecting rod to rotate around the connecting rod pin 73, and the lower ends of the two connecting rods 7 will be gradually opened outward. When the hooks 72 at the lower ends of the two connecting rods 7 are separated from the circular plate-shaped linkage part of the punch ejector 4, the punch ejector 4 is separated from the constraint of the connecting rod 7, and the compression spring 22 is released. Under the compression deformation force of the compression spring 22, the punch ejector 4 will hit the punch 3 downward, and the punch shaft of the punch 3 will punch out of the lower end wall of the housing 1, so that the sheet metal pre-punched hole 101 on the sheet metal part 10 is turned downward, and the process flanging required for the threaded hole is punched out. The sheet metal flanging device has a compact structure and is easy to carry and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 is an exploded view of an embodiment of a sheet metal flanging device of the present invention;

[0059] Figure 2 is a longitudinal cross-sectional view of a natural state of an embodiment of a sheet metal flanging device of the present invention;

[0060] Figure 3 is a longitudinal cross-sectional view of a button-pressed state of an embodiment of a sheet metal flanging device of the present invention;

[0061] Figure 4 is a longitudinal cross-sectional view of a punch of an embodiment of a sheet metal flanging device of the present invention;

[0062] Figure 5 is a longitudinal cross-sectional view of an adjustable support base of an embodiment of a sheet metal flanging device of the present invention;

[0063] Figure 6 It is a transverse cross-sectional view of an adjustable support base of an embodiment of a sheet metal flanging device of the present invention.

[0064] Description of reference numerals:

[0065] 1 housing; 11 connecting rod shaft hole; 13 fixing pin shaft; 14 scale line; 21 ejector spring; 22 compression spring; 23 button spring; 24 connecting rod spring; 3 punch; 4 punch ejector; 5 ejector connecting rod plate; 51 guide groove; 52 ejector connecting shaft; 6 button; 7 connecting rod; 71 inclined surface; 72 hook claw; 73 connecting rod pin shaft; 8 adjustable support seat; 81 connecting groove; 82 circumferential notch; 9 die; 90 die base; 901 raised shaft; 91 combined die; 911 flanging die hole position; 92 die spring; 921 washer; 10 sheet metal; 101 sheet metal pre-punching hole. DETAILED DESCRIPTION

[0066] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Embodiment 1

[0068] like Figure 1 , Figure 2 , Figure 3 As shown, the sheet metal flanging device includes a housing 1, an ejector spring 21, a compression spring 22, a punch 3, a punch ejector 4, an ejector connecting rod plate 5, an ejector connecting shaft 52, a button 6, and a connecting rod 7;

[0069] The ejector spring 21 and the compression spring 22 are both helical springs;

[0070] The lower end wall of the housing 1 is annular;

[0071] The outer diameter of the ejector spring 21 is larger than the inner diameter of the lower end wall of the housing 1;

[0072] The punch 3 comprises a circular plate head and a punch shaft coaxially combined together;

[0073] The outer diameter of the circular plate head is larger than the outer diameter of the ejector spring 21;

[0074] The maximum outer diameter of the punch shaft is smaller than the inner diameter of the ejector spring 21;

[0075] The ejector spring 21 is placed in the housing 1, and its lower end abuts against the lower end wall of the housing 1;

[0076] The punch shaft of the punch 3 is inserted into the ejector spring 21, and the lower end of the punch shaft is located at the center of the lower end wall of the housing 1;

[0077] The circular plate head of the punch 3 is pressed on the upper end of the ejector spring 21;

[0078] The punch pin 4 comprises a circular plate-shaped linkage portion and a cylindrical impact portion coaxially combined together;

[0079] The outer diameter of the circular plate-shaped linkage part is greater than the outer diameter of the cylindrical impact part;

[0080] The cylindrical impact portion of the punch ejector pin 4 is located directly above the circular plate head of the punch 3;

[0081] The lower end of the compression spring 22 is fixed to the central position of the upper side of the circular plate-shaped linkage part of the punch ejector 4, and the upper end is fixedly connected to the central position of the lower side of the ejector connecting rod plate 5;

[0082] The lower end of the ejector connecting shaft 52 is fixed to the center position of the upper side of the ejector connecting rod plate 5;

[0083] The upper end of the ejector connecting shaft 52 passes through the upper end wall of the housing 1 and is fixed to the button 6;

[0084] The left and right ends of the ejector connecting rod plate 5 are respectively provided with guide grooves 51;

[0085] The upper parts of the two connecting rods 7 are respectively pivotally fixed to the connecting rod shaft holes 11 arranged on the inner walls of both sides of the upper part of the housing 1 through the connecting rod pins 73;

[0086] The middle part of the connecting rod 7 is formed with an inclined surface 71 which gradually bulges inward from top to bottom;

[0087] The lower end of the connecting rod 7 is formed with a hook 72 extending inward;

[0088] In the natural state, the guide grooves 51 at the left and right ends of the ejector connecting rod plate 5 are respectively clamped on the upper parts of the inclined surfaces 71 of the two connecting rods 7; the hook claws 72 at the lower ends of the two connecting rods 7 are respectively hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector 4.

[0089] The sheet metal flanging device of the first embodiment, such as Figure 2 As shown, in the natural state, no pressure is applied to the button 6, the compression spring 22 is in the stretched state, and the hook claws 72 at the lower ends of the two connecting rods 7 are respectively hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector pin 4, restricting the downward movement of the punch ejector pin 4, and no impact pressure is applied to the punch 3. Figure 3As shown, when downward pressure is applied to the button 6, the ejector connecting shaft 52 drives the ejector link plate 5 to move downward, causing the compression spring 22 to be gradually compressed and deformed. When the ejector link plate 5 moves down to the inclined surface 71 in the middle of the connecting rod 7, the guide grooves 51 at the left and right ends of the ejector link plate 5 will push the connecting rod to rotate around the connecting rod pin 73, and gradually open the lower ends of the two connecting rods 7 to the outside. When the hooks 72 at the lower ends of the two connecting rods 7 are separated from the circular plate-shaped linkage part of the punch ejector 4, the punch ejector 4 is separated from the constraint of the connecting rod 7, and the compression spring 22 is released. Under the compression deformation force of the compression spring 22, the punch ejector 4 will hit the punch 3 downward, and the punch shaft of the punch 3 will punch out of the lower end wall of the shell 1, causing the sheet metal pre-punched hole 101 on the sheet metal part 10 to turn downward, punching out the process flanging required for the threaded hole. The sheet metal flanging device of the first embodiment has a compact structure and is easy to carry and use.

[0090] Embodiment 2

[0091] Based on the first embodiment, the sheet metal flanging device further includes a button spring 23;

[0092] The button spring 23 is sleeved outside the ejector connecting shaft 52;

[0093] The lower end of the button spring 23 is fixed to the upper side of the ejector link plate 5 , and the upper end is fixed to the lower side of the upper end wall of the housing 1 .

[0094] In the sheet metal flanging device of the second embodiment, the button 6 is released, and under the action of the ejector spring 21, the compression spring 22 and the button spring 23, the ejector connecting rod plate 5 moves upward, and at the same time drives the punch ejector 4 to move upward, and the lower end of the connecting rod 7 contracts inward, and finally the hook claws 72 at the lower ends of the two connecting rods 7 are respectively clamped and hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector 4.

[0095] Embodiment 3

[0096] Based on the second embodiment, the sheet metal flanging device further includes a connecting rod spring 24;

[0097] The connecting rod spring 24 is a coil spring;

[0098] One end of the connecting rod spring 24 is fixed to the upper inner wall of the housing 1 , and the other end is fixed to the upper rear side of the connecting rod 7 and is located above the connecting rod pin 73 .

[0099] Preferably, the upper and lower ends of the compression spring 22 are respectively welded and fixed to the circular plate-shaped linkage part connecting the ejector connecting rod plate 5 and the punch ejector 4;

[0100] Preferably, the upper and lower ends of the button spring 23 are respectively welded and fixed to the lower side surface of the upper end wall of the housing 1 and the upper side surface of the ejector connecting rod plate 5.

[0101] Preferably, the housing 1 is composed of two left and right pieces that are buckled together and fastened with bolts.

[0102] The sheet metal flanging device of Example 3 does not apply pressure to the button 6 in a natural state, and the compression spring 22 is in a stretched state. Under the pulling force of the connecting rod spring 24, the hook claws 72 at the lower ends of the two connecting rods 7 will be tightly hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector pin 4, respectively, to limit the downward movement of the punch ejector pin 4.

[0103] Embodiment 4

[0104] Based on the first embodiment, the sheet metal flanging device further includes a die 9;

[0105] The die 9 is provided with a flanging die hole 911 adapted to the punch shaft of the punch 3 .

[0106] Embodiment 5

[0107] Based on the fourth embodiment, Figure 4 As shown, the punch shaft of the punch 3 is in N-step shape with the outer diameter gradually decreasing from top to bottom, where N is a positive integer;

[0108] The die 9 is provided with N+1 types of flanging die hole positions 911 adapted to different outer diameters of the punch shaft of the punch 3 .

[0109] Preferably, the die 9 comprises a die base 90 and a combined die 91;

[0110] The combined die 91 is provided with N+1 types of flanging die hole positions 911;

[0111] The upper end surface of the die base 90 is provided with N+1 types of raised shafts 901;

[0112] The lower end of the die spring 92 is fixed to the raised shaft 901 of the die base 90, and the die spring 92 passes through the corresponding flanging die hole 911 of the combined die 91, and the upper end is fixed to the washer 921. The center hole of the washer 921 cooperates with the lower end of the punch shaft of the punch 3 to ensure that the punch shaft, the flanging die hole 911 and the center of the pre-punched hole of the sheet metal are aligned.

[0113] Preferably, the die base 90 and the combined die 91 are fastened together using bolts;

[0114] The lower end of the die spring 92 is welded and fixed to the raised shaft 901 of the die base 90 , and the upper end is welded and fixed to the washer 921 .

[0115] Preferably, the die base 90 and the combined die 91 are fastened together using bolts.

[0116] Preferably, N is 1, 2, 3 or 4.

[0117] Embodiment 6

[0118] Based on the first embodiment, the sheet metal flanging device further includes an adjustable support seat 8;

[0119] The adjustable support seat 8 is in the shape of a circular tube;

[0120] like Figure 5 , Figure 6 As shown, the tube wall of the adjustable support seat 8 is provided with an axial connecting groove 81 and a plurality of circumferential notches 82 arranged vertically, and the ends of the same side of the plurality of circumferential notches 82 are all connected to the connecting groove 81;

[0121] The distance between adjacent circumferential notches 82 is adapted to the height of the corresponding steps of the punch axis of the punch 3;

[0122] A fixing pin 13 is provided on the outer side of the lower part of the housing 1;

[0123] The inner diameter of the adjustable support seat 8 is adapted to the outer diameter of the bottom of the shell 1, and is used to be mounted outside the bottom of the shell 1. By allowing the fixed pin shaft 13 to enter different circumferential grooves 82, the distance from different steps of the punch shaft to the upper side of the sheet metal part 10 is adjusted.

[0124] Preferably, a scale line 14 is provided above the fixing pin 13 on the outer side of the bottom of the housing 1, so as to facilitate the rotation of the adjustable support seat 8 so that the fixing pin 13 enters the corresponding circumferential notch 82 and aligns the position. According to the scale lines 14 distributed on the housing 1, the axial connecting groove provided on the tube wall of the support seat 8 is aligned with the fixing pin 13 at the bottom of the housing 1, and the support seat 8 is moved to the corresponding circumferential notch, and then rotated to fix the support seat 8 to the bottom of the housing 1.

[0125] In the sheet metal flanging device of the sixth embodiment, an adjustable support seat 8 is assembled at the bottom of the housing 1. When the punch pin 4 hits the punch 3, the position of the punch 3 moving downward is the same. Since the punch shaft of the punch 3 is in an N-step step shape with an outer diameter gradually decreasing from top to bottom, in order to ensure that the distances from different steps of the punch shaft of the punch 3 to the upper side of the sheet metal part are the same, an adjustable height support seat 8 is used.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sheet metal flanging device, characterized in that: It comprises a housing (1), an ejector spring (21), a compression spring (22), a punch (3), a punch ejector (4), an ejector connecting rod plate (5), an ejector connecting shaft (52), a button (6), a connecting rod (7) and a button spring (23); The ejector spring (21) and the compression spring (22) are both helical springs; The lower end wall of the shell (1) is in the shape of a circular ring; The outer diameter of the ejector spring (21) is greater than the inner diameter of the lower end wall of the housing (1); The punch (3) comprises a circular plate head and a punch shaft coaxially combined together; The outer diameter of the circular plate head is greater than the outer diameter of the ejector spring (21); The maximum outer diameter of the punch shaft is smaller than the inner diameter of the ejector spring (21); The ejector spring (21) is placed in the housing (1), with its lower end abutting against the lower end wall of the housing (1); The punch shaft of the punch (3) is inserted into the ejector spring (21), and the lower end of the punch shaft is located at the center of the lower end wall of the housing (1); The circular plate head of the punch (3) is pressed on the upper end of the ejector spring (21); The punch ejector pin (4) comprises a circular plate-shaped linkage portion and a cylindrical impact portion coaxially combined together; The outer diameter of the circular plate-shaped linkage part is greater than the outer diameter of the cylindrical impact part; The cylindrical impact portion of the punch ejector pin (4) is located directly above the circular plate head of the punch (3); The lower end of the compression spring (22) is fixed to the central position of the upper side surface of the circular plate-shaped linkage portion of the punch ejector pin (4), and the upper end is fixedly connected to the central position of the lower side surface of the ejector pin connecting rod plate (5); The lower end of the ejector connecting shaft (52) is fixed to the center position of the upper side of the ejector connecting rod plate (5); The upper end of the ejector pin connecting shaft (52) passes through the upper end wall of the housing (1) and is fixed to the button (6); The left and right ends of the ejector connecting rod plate (5) are respectively provided with guide grooves (51); The upper parts of the two connecting rods (7) are respectively pivotally fixed to the connecting rod shaft holes (11) arranged on the inner walls of both sides of the upper part of the housing (1) through connecting rod pins (73); The middle part of the connecting rod (7) is formed with an inclined surface (71) which gradually bulges inward from top to bottom; The lower end of the connecting rod (7) is formed with a hook claw (72) extending inward; In a natural state, the guide grooves (51) at the left and right ends of the ejector connecting rod plate (5) are respectively clamped on the upper parts of the inclined surfaces (71) of the two connecting rods (7); the hook claws (72) at the lower ends of the two connecting rods (7) are respectively hooked on the lower side edge of the circular plate-shaped linkage part of the punch ejector (4); The button spring (23) is sleeved outside the ejector connecting shaft (52); The button spring (23) has a lower end fixed to the upper side of the ejector connecting rod plate (5), and an upper end fixed to the lower side of the upper end wall of the housing (1); The housing (1) is composed of two left and right pieces that are buckled together and fastened with bolts.

2. The sheet metal flanging device according to claim 1, characterized in that: The sheet metal flanging device also includes a connecting rod spring (24); The connecting rod spring (24) is a coil spring; One end of the connecting rod spring (24) abuts against the upper inner wall of the housing (1), and the other end abuts against the upper rear side of the connecting rod (7) and is located above the connecting rod pin (73).

3. The sheet metal flanging device according to claim 2, characterized in that: The upper and lower ends of the compression spring (22) are respectively welded and fixed to the circular plate-shaped linkage part connecting the ejector connecting rod plate (5) and the punch ejector (4); The upper and lower ends of the button spring (23) are respectively welded and fixed to the lower side surface of the upper end wall of the housing (1) and the upper side surface of the ejector connecting rod plate (5).

4. The sheet metal flanging device according to claim 1, characterized in that: The sheet metal flanging device also includes a concave die (9); The die (9) is provided with a flanging die hole (911) adapted to the punch shaft of the punch (3).

5. The sheet metal flanging device according to claim 4, characterized in that: The punch shaft of the punch (3) is in N-step shape with the outer diameter gradually decreasing from top to bottom, where N is a positive integer; The die (9) is provided with N+1 types of flanging die hole positions (911) adapted to different outer diameters of the punch shaft of the punch (3).

6. The sheet metal flanging device according to claim 5, characterized in that: The concave die (9) comprises a concave die base (90) and a combined concave die (91); The combined concave die (91) is provided with N+1 types of flanging concave die hole positions (911); The upper end surface of the die base (90) is correspondingly provided with N+1 types of raised shafts (901); The lower end of the die spring (92) is fixed to the raised shaft (901) of the die base (90), the die spring (92) passes through the corresponding flanging die hole (911) of the combined die (91), and the upper end is fixed to the washer (921).

7. The sheet metal flanging device according to claim 6, characterized in that: The die base (90) and the combined die (91) are fastened together using bolts; The lower end of the die spring (92) is welded and fixed to the raised shaft (901) of the die base (90), and the upper end is welded and fixed to the washer (921).

8. The sheet metal flanging device according to claim 6, characterized in that: N is 1, 2, 3, or 4.

9. The sheet metal flanging device according to claim 6, characterized in that: The sheet metal flanging device also includes an adjustable support seat (8); The adjustable support seat (8) is in the shape of a circular tube; The tube wall of the adjustable support seat (8) is provided with an axial connecting groove (81) and a plurality of circumferential notches (82) arranged vertically, and the ends of the plurality of circumferential notches (82) on the same side are all connected to the connecting groove (81); The distance between adjacent circumferential notches is adapted to the height of the corresponding steps of the punch axis of the punch (3); A fixing pin shaft (13) is provided on the outer side surface of the lower part of the housing (1); The inner diameter of the adjustable support seat (8) is adapted to the outer diameter of the bottom of the shell (1) and is used to be sleeved outside the bottom of the shell (1). By allowing the fixed pin shaft (13) to enter different circumferential grooves (82), the distance from different steps of the punch shaft to the upper side of the sheet metal part can be adjusted.

10. The sheet metal flanging device according to claim 9, characterized in that: A scale line is provided above the fixed pin shaft (13) on the outer side surface of the bottom of the housing (1) to facilitate the rotation of the adjustable support seat (8) to align the position of the fixed pin shaft (13) when it enters the corresponding circumferential notch (82).

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