CN112642928B

CN112642928B - Flange edge cutting method and cutting equipment

Info

Publication number: CN112642928B
Application number: CN202011401141.6A
Authority: CN
Inventors: 王聪; 张健
Original assignee: Dongguan Xinmeiyang Technology Co ltd
Current assignee: Dongguan Xinmeiyang Technology Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2023-05-16
Anticipated expiration: 2040-12-04
Also published as: CN112642928A

Abstract

The invention provides a flange edge cutting method, which comprises the following steps: s10, stamping and forming a metal workpiece connected with the material belt; the metal workpieces comprise cylinder walls, tube cavities formed by surrounding the cylinder walls and flange edges formed at the opening ends of the cylinder walls, wherein each flange edge comprises an arc turnover part and a material belt connecting part formed at the outer sides of the arc turnover parts, and a plurality of metal workpieces are connected to the material belt through the material belt connecting parts; s20, stamping and forming the arc turnover part of the metal workpiece into a plate-shaped opening part; the plate-shaped opening part is of an annular plate structure, and the inner diameter of the plate-shaped opening part gradually increases from bottom to top; s30, cutting the joint of the plate-shaped opening part and the cylinder wall, and extruding the inner side of the top of the cylinder wall to form an annular notch; s40, punching and extruding the notch surface at the top of the cylinder wall downwards to cut off the metal workpiece downwards from the bottom of the plate-shaped opening part; the application also includes a flange edge cutting apparatus.

Description

Flange edge cutting method and cutting equipment

Technical Field

The invention relates to the field of metal processing, in particular to a flange edge cutting method and cutting equipment.

Background

After the conventional metal tube or metal can is punched and stretched, the material strip connected to the open end needs to be cut off, and the conventional cutting method is as shown in fig. 1 and 2, and the cutting die comprises a lower die 20', an upper die 30' and a punch 31 'arranged in the upper die 30'. The metal pipe or the metal can is collectively called as a metal workpiece 10', the metal workpiece 10 is connected to a material belt after being stamped and pulled up, the metal workpiece 10 comprises a cylinder wall 11' and a flange edge 12 'arranged at the opening end of the cylinder wall 11, and the flange edge 12' is formed with a bending cambered surface 121 'so that the material belt is connected with the outer side of the flange edge 12' in the vertical direction of the cylinder wall 11. Then, the flange 12' is cut by punching down the junction of the flange 12' and the material web by a cylindrical punch 31'. The metal workpiece 10 'obtained by the scheme has the following problems that an uneven step structure 122' exists between the flange edge 12 'and the outer side surface of the cylinder wall 11' due to tolerance, and the radian of the bending cambered surface 121 'of the flange edge 12' is overlarge. The elimination of the step structure 122' also requires CNC machining or grinding, which undoubtedly adds significant manufacturing costs.

Disclosure of Invention

In view of the above, it is necessary to provide a flange edge cutting method and cutting equipment capable of cutting a material strip connected to a flange edge without a mark, thereby ensuring the smoothness of the appearance surface of the flange edge.

In order to solve the technical problems, the application provides a flange edge cutting method, which comprises the following steps: s10, stamping and forming a metal workpiece connected with the material belt; the metal workpieces comprise cylinder walls, tube cavities formed by surrounding the cylinder walls and flange edges formed at the opening ends of the cylinder walls, wherein each flange edge comprises an arc turnover part and a material belt connecting part formed at the outer sides of the arc turnover parts, and a plurality of metal workpieces are connected to the material belt through the material belt connecting parts; s20, stamping and forming the arc turnover part of the metal workpiece into a plate-shaped opening part; the plate-shaped opening part is of an annular plate structure, and the inner diameter of the plate-shaped opening part gradually increases from bottom to top; s30, cutting the joint of the plate-shaped opening part and the cylinder wall, and extruding the inner side of the top of the cylinder wall to form an annular notch; s40, punching and extruding the notch surface at the top of the cylinder wall downwards to cut off the metal workpiece downwards from the bottom of the plate-shaped opening part.

Preferably, in step S20, the arc surface of the house type turnover part is extruded by an inclined plane to form a plate-shaped opening part with a flat plate structure, and an included angle between the plate-shaped opening part and a horizontal plane is between 15 degrees and 60 degrees.

Preferably, an included angle between the plate-shaped opening portion and the horizontal plane is 45 degrees.

Preferably, in step S30, the notch is cut by punching, and the notch does not completely cut off the connection between the cylinder wall and the plate-shaped opening, and a certain margin exists at the periphery of the notch to connect the cylinder wall and the bottom of the plate-shaped opening.

Preferably, the plane where the material belt connecting part is located is in the same horizontal plane with the material belt, the material belt connecting part is formed by folding the open end of the pipe wall by 90 degrees, the material belt is in a strip shape and comprises a material belt main body and a plurality of connecting strips which are formed by extending the material belt main body and are connected to the material belt connecting part, and a plurality of metal workpieces are uniformly arranged on the length direction of the material belt and are connected into a whole through the material belt connecting part.

In order to solve the technical problem, the application further provides flange limit excision equipment, including last mould and lower mould, the lower mould includes along the first, second, the third die core that transverse direction set up, go up the mould including corresponding first, second, the third drift of third die core, first die core include first punching a hole and form in the first uncovered that punches a hole the upper end is inboard, uncovered is annular planar structure, first drift include with uncovered profile modeling's sloping, second die core includes that the second punches a hole, the second drift includes that the external diameter is not less than the cutting step of second punching a hole internal diameter, the third die core includes from last die-cut hole and the unloading hole that sets up down, the internal diameter of unloading hole is greater than the internal diameter of die-cut hole, the third drift low side is gone into in the die-cut hole.

Preferably, the flange edge cutting device is used for cutting off a flange edge of a metal workpiece, the metal workpiece comprises a cylinder wall, a tube cavity formed by surrounding the cylinder wall and a flange edge formed at the opening end of the cylinder wall, the flange edge comprises an arc turnover part and a material belt connecting part formed at the outer side of the arc turnover part, a plurality of metal workpieces are connected onto the material belt through the material belt connecting part, and the material belt pulls the metal workpiece to sequentially pass through the first punching die core, the second punching die core and the third punching die core and be punched by the first punching die, the second punching die and the third punching die.

Preferably, the opening of the first die core and the inclined table of the first punch mutually extrude the arc turnover part, so that the arc turnover part is extruded into a flat plate-shaped opening part, and the plate-shaped opening part is of a flat plate structure and has an included angle of 15-60 degrees with the horizontal plane.

Preferably, the inner wall surface of the junction of the cylinder wall and the plate-shaped opening is extruded by the second die core and the cutting step of the second punch to form an annular notch, the second punch further comprises a second punch body, a second punch punching part, a cutting part positioned between the second punch punching parts and an avoiding part formed between the second punch body and the cutting part, the outer diameter of the second punch body is larger than that of the cutting part, the outer diameter of the cutting part is larger than that of the second punch punching part, and the cutting step is formed on the periphery of the bottom surface of the cutting part.

Preferably, the annular incision surface of the top end of the cylinder wall is pressed downwards by the bottom of the third punch to be broken away from the plate-shaped opening part to complete the cutting.

According to the flange edge cutting method and the cutting equipment, an arc-shaped turnover part of the flange edge at the opening end of the metal workpiece is punched to form a plate-shaped opening part, then a notch is formed at the root part of the plate-shaped opening part in a punching mode, and finally the notch surface at the top of the metal workpiece is impacted downwards to disconnect the metal workpiece from the flange edge; the plate-shaped opening part of the opening end of the metal workpiece obtained by cutting through the method is of a plate-shaped structure, so that the notch blanking of the next step can directly act on the root part of the plate-shaped opening part, the inner side surface of the opening end of the obtained metal workpiece almost has no residual arc surface, the outer side of the opening end of the metal workpiece also has no step structure, good product quality is obtained, the processes of polishing and the like are not needed, and the cost is saved.

Drawings

FIG. 1 is a cross-sectional view of a prior art flange edge cutting apparatus;

FIG. 2 is an enlarged view of a portion of the broken line coil of FIG. 1;

FIG. 3 is a schematic diagram of the trimming step of the flange edge cutting method of the present invention;

FIG. 4 is a cross-sectional view of the flange edge cutting apparatus of the present invention and three partial enlarged views thereof;

fig. 5 is a front view of a punch assembly of the flange edge cutting apparatus of the present invention.

The meaning of the reference numerals in the drawings are: metal work-piece-10; a cylinder wall-11; flange edges-12; an arc-shaped turnover part-121; a material belt connecting part-122; a plate-like opening-123; incision-124; lower die-20; a lower die holder-21; a lower die plate-22; a lower mold core-23; blanking holes-24; a first die core-25; a first punched hole-251; an opening-252; a second die core-26; a second punch-261; a third die core-27; punching holes-272; a blanking hole-271; support column-28; upper die-30; an upper template-31; upper die pad plates-32, 33; an upper mold core-34; a first punch-35; a first punch body-351; a first punch penetration-352; ramp-353; a second punch-36; a second punch body-361; a second punch penetration portion-362; cutting part-363; cutting the step-364; an avoidance portion 365; and a third punch 37.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The product orientation shown in fig. 4 is set as the direction of the application, namely, the right side of fig. 4 is right, the rear side of fig. 4 is right opposite, and the upper side of fig. 4 is above.

Referring to fig. 3, the flange cutting method of the present application is suitable for cutting a flange of an open end of a metal workpiece 10. The metal workpiece 10 is a metal can or a metal tubular product, and specifically, the metal workpiece 10 is cylindrical and includes a cylinder wall 11, a tube cavity 13, and a flange 12 disposed at an open end of the cylinder wall 11. The metal workpiece 10 may have one end closed or may have both ends open.

The flange edge cutting method comprises the following steps:

s10, stamping and forming the metal workpiece 10 connected with the material belt 40;

in this step, the metal workpiece 10 is formed by a stamping and stretching process, so that the metal workpiece 10 forms the cylinder wall 11, a tube cavity 13 surrounded by the cylinder wall 11, and a flange formed at an opening end of the cylinder wall 11. The flange 12 includes an arc-shaped turnover part 121 formed in the stretching process, and a material belt connecting part 122 formed at the outer side of the arc-shaped turnover part 121. The plane of the material belt connecting portion 122 is in the same level with the material belt 40, that is, the material belt connecting portion 122 is formed by folding over the open end of the pipe wall 11 by 90 degrees. The material belt 40 is in a strip shape and comprises a material belt main body 41 and a plurality of connecting strips 42 which are formed by extending from the material belt main body 41 and are connected to the material belt connecting parts 122. The metal workpieces 10 are uniformly arranged in the length direction of the material tape 40 and are connected as a whole by a material tape connecting portion 122.

S20, stamping the arc turnover part 121 of the metal workpiece 10 into a plate-shaped opening 123;

in this step, the arc-shaped turnover part 121 is punched vertically to form a plate-shaped opening 123. The included angle between the plate-shaped opening 123 and the horizontal direction is 15-60 degrees, preferably 45 degrees, even if a large bending angle appears at the joint of the plate-shaped opening 123 and the cylinder wall 11, so as to facilitate the subsequent cutting operation. The plate-shaped opening 123 has an annular flat plate structure, and the inner diameter thereof gradually increases from bottom to top.

S30, cutting the joint of the plate-shaped opening 123 and the cylinder wall 11, and extruding the inner side of the top of the cylinder wall 11 to form an annular notch 124;

in this step, the notch 124 is cut by pressing, and the notch 124 does not completely cut off the connection between the cylindrical wall 11 and the plate-shaped opening 123, and a certain margin exists on the periphery of the notch 124 to connect the cylindrical wall 11 and the bottom of the plate-shaped opening 123.

And S40, punching and extruding the upper end edge of the notch 124 downwards to separate the metal workpiece 10 downwards from the bottom of the plate-shaped opening 123 and finish cutting.

The flange edge cutting method comprises the steps of punching an arc-shaped turnover part 121 of a flange edge 12 at the opening end of a metal workpiece 10 into a plate-shaped opening part 123, punching the root part of the plate-shaped opening part 123 to form a notch 124, and finally, downwards impacting the surface of the notch 124 at the top of the metal workpiece 10 to disconnect the metal workpiece 10 from the flange edge 12; the plate-shaped opening 123 of the opening end of the metal workpiece 10 obtained by cutting through the method is of a plate-shaped structure, so that the next step of cutting by the notch 124 can directly act on the root of the plate-shaped opening 123, the inner side surface of the opening end of the obtained metal workpiece 10 almost has no residual arc surface, the outer side of the opening end of the metal workpiece 10 also has no step structure, good product quality is obtained, the processes of polishing and the like are not needed, and the cost is saved.

With continued reference to fig. 4 and 5, the flange edge cutting apparatus of the present application is a stamping die, and specifically, the flange edge cutting apparatus of the present application includes a lower die 20 and an upper die 30.

The lower die 20 includes a lower die holder 21, a lower die plate 22 fixed to the lower die holder 21, a lower die core 23 fixed to the lower die plate 22, and first to third die

cores

25, 26, 27 sequentially embedded in the lower die core 23 in the lateral direction.

The distance between the first die core 25 and the second die core 26 is equal to the distance between two adjacent metal workpieces 10 on the material belt 40, and the holding grooves 231 are respectively formed in the upper die core 23 on the left side of the first die core 25, between the second die core 26 and the third die core 27, and on the right side of the third die core 27. The metal workpieces 10 connected by the material tape 40 are automatically pulled and moved in a left-to-rear direction.

The first die core 25 includes a first punched hole 251 and an opening 252 formed inside the top end of the first punched hole 251. The opening 252 has an annular plane structure, and an included angle with the horizontal plane is between 15 degrees and 60 degrees, preferably 45 degrees. The outer diameter of the cylinder wall 11 of the metal work 10 is not larger than the inner diameter of the first punched hole 251.

The second die core 26 includes a second punched hole 261, an inner diameter of the second punched hole 261 is equal to an inner diameter of the first punched hole 251, a top of the second punched hole 261 is in a right-angle structure, and a root of the plate-shaped opening 123 of the flange 12 is limited at an outer periphery of the top of the second punched hole 261.

The third die core 27 includes a blanking hole 271 located at the lower side and a die-cut hole 272 located above the blanking hole 271, wherein the inner diameter of the die-cut hole 272 is equal to the inner diameter of the second punched hole 261, and the inner diameter of the blanking hole 271 is larger than the inner diameter of the die-cut hole 272.

A support column 28 is arranged below the first and second punched

holes

251, 261, the outer diameter of the support column 28 is equal to the inner diameter of the first and second punched

holes

251, 261, a spring is arranged below the support column 28, and the spring provides upward elastic force to the support column 28. The lower die 20 further comprises a blanking hole 24 arranged below the third die core 27, and the blanking hole 24 penetrates through the lower die base 21, the lower die plate 22 and is communicated with the blanking hole 271 so as to enable the metal workpiece 10 to be blanked downwards.

The upper die 30 includes an upper die plate 31, two stacked upper

die pad plates

32, 33 fixed under the upper die plate 31, an upper die core 34 fixed under the upper die pad plate 33, first to

third punches

35, 36, 37 fixed in the upper

die pad plates

32, 33 and the upper die core 34.

The first punch 35 corresponds to the first punch core 25, and the first punch 35 includes a first punch body 351, a first punch penetration portion 352 formed to protrude downward from the middle of the bottom of the first punch body 351, and a ramp 353 formed between the first punch body 351 and the first punch penetration portion 352. The outer diameter of the first punch body 351 is larger than the outer diameter of the first punch-in portion 352, the inclined table 353 extends from the outer wall surface of the first punch-in portion 352 toward the bottom surface of the first punch body 351, the inclined table 353 faces downward, and the inclined table 353 and the opening 252 of the first die core 25 are contoured surfaces. The opening 252 and the ramp 353 are co-extruded to flatten the curved turnover portion 121 into the plate-like opening 123. When the plate-like opening 123 is press-formed, the first punch penetration portion 352 is entered into the lumen 13 of the metal work 10.

The second punch 36 corresponds to the second punch core 26, and the second punch 36 includes a second punch body 361, a second punch-in portion 362, a cutting portion 363 located between the second punch body 361 and the second punch-in portion 362, a cutting step 364 formed on a bottom surface of the cutting portion 363 and located at a top of an outer periphery of the second punch-in portion 362, and a relief portion 365 formed between the cutting portion 363 and the second punch body 361. The outer diameter of the second punch body 361 is larger than the outer diameter of the cutting portion 363, the outer diameter of the cutting portion 363 is larger than the outer diameter of the second punch-in portion 362, and the cutting step 364 is formed at the difference between the outer diameters of the second punch-in portion 362 and the cutting portion 363. The outer diameter of the cutting portion 363 is not smaller than the inner diameter of the second punched hole 261, the escape portion 365 is an upward slope from the outside Zhou Xie of the cutting portion 363, and the escape portion 365 is a portion that prevents the second punch body 361 from interfering with the plate-like opening 123. After the second punch 36 is punched down, the cutting step 364 cooperates with the top edge of the second punched hole 261 to press metal at the root (bottom) of the cylindrical wall 11 and the plate-shaped opening 123 and form an annular notch 124, but the notch 124 does not cut off the cylindrical wall 11 and the plate-shaped opening 123, and a certain connecting margin is maintained.

The third punch 37 corresponds to the third die core 27, the bottom of the third punch 37 has a cylindrical structure, and the outer diameter of the bottom of the third punch 37 is equal to the die-cut hole 272 of the third die core 27. When the third punch 37 presses down, the bottom of the third punch 37 presses down the surface of the notch 124 at the upper end of the cylinder wall 11, so that the cylinder wall 11 is broken from the plate-like opening 123 and is pressed into the blanking hole 271 and further blanked through the blanking hole 24.

According to the flange edge cutting equipment, the material belt 40 is pulled through automatic material pulling and moves along the transverse right side, three times of stamping of the first punch 35, the second punch 36 and the third punch 37 are respectively carried out, the metal workpiece 10 and the flange edge 12 are cut off, the inner side of the opening end of the metal workpiece 10 is enabled to eliminate or keep a smaller bending cambered surface, the outer wall surface of the opening end of the metal workpiece 10 is kept smooth, and a good appearance surface is obtained.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The flange edge cutting method is characterized by comprising the following steps of:

s10, stamping and forming a metal workpiece connected with the material belt;

the metal workpieces comprise cylinder walls, tube cavities formed by surrounding the cylinder walls and flange edges formed at the opening ends of the cylinder walls, wherein each flange edge comprises an arc turnover part and a material belt connecting part formed at the outer sides of the arc turnover parts, and a plurality of metal workpieces are connected to the material belt through the material belt connecting parts;

s20, stamping and forming the arc turnover part of the metal workpiece into a plate-shaped opening part;

the plate-shaped opening part is of an annular plate structure, and the inner diameter of the plate-shaped opening part gradually increases from bottom to top;

s30, cutting the joint of the plate-shaped opening part and the cylinder wall, and extruding the inner side of the top of the cylinder wall to form an annular notch;

s40, punching and extruding the notch surface at the top of the cylinder wall downwards to cut off the metal workpiece downwards from the bottom of the plate-shaped opening part.

2. The flange edge cutting method as claimed in claim 1, wherein in the step S20, the arc surface of the arc turnover part is extruded through an inclined plane to form a plate-shaped opening part of a flat plate structure, and an included angle between the plate-shaped opening part and a horizontal plane is between 15 degrees and 60 degrees.

3. A flange edge cutting method according to claim 2 wherein the angle between said plate-like opening and said horizontal plane is 45 degrees.

4. The flange cutting method according to claim 1, wherein in step S30, the slit is cut by pressing, and the slit does not completely cut off the connection between the cylinder wall and the plate-like opening, and a certain margin exists at the periphery of the slit to connect the cylinder wall and the bottom of the plate-like opening.

5. The flange edge cutting method as claimed in claim 1, wherein the plane of the material strip connecting portion is in the same horizontal plane as the material strip, the material strip connecting portion is formed by folding the open end of the cylinder wall by 90 degrees, the material strip is in a strip shape, and comprises a material strip main body and a plurality of connecting strips which are formed by extending from the material strip main body and are connected to the material strip connecting portion, and a plurality of metal workpieces are uniformly arranged in the length direction of the material strip and are connected into a whole through the material strip connecting portion.

6. A flange edge cutting device for realizing the flange edge cutting method as defined in claim 1, comprising an upper die and a lower die, wherein the lower die comprises a first die core, a second die core and a third die core which are arranged along the transverse direction, the upper die comprises a first punch, a second punch and a third punch which correspond to the first die core, the second die core and the third die core, the first die core comprises a first punching hole and an opening formed on the inner side of the upper end of the first punching hole, the opening is of an annular plane structure, the first punch comprises a sloping table which is contoured with the opening, the second die core comprises a second punching hole, the second punch comprises a cutting step with the outer diameter not smaller than the inner diameter of the second punching hole, the third die core comprises a punching hole and a blanking hole which are arranged from top to bottom, the inner diameter of the blanking hole is larger than the inner diameter of the punching hole, and the lower end of the third punch is punched into the punching hole;

the flange edge cutting equipment is used for cutting off the flange edge of a metal workpiece, the metal workpiece comprises a cylinder wall, a tube cavity formed by surrounding the cylinder wall and a flange edge formed at the opening end of the cylinder wall, the flange edge comprises an arc turnover part and a material belt connecting part formed on the outer side of the arc turnover part, a plurality of metal workpieces are connected onto the material belt through the material belt connecting part, and the material belt pulls the metal workpiece to sequentially pass through the first punching die core, the second punching die core and the third punching die core and be punched by the first punching die, the second punching die and the third punching die.

7. The flange cutting apparatus of claim 6, wherein the opening of the first die core and the ramp of the first punch press the arc-shaped turnover portion against each other, so that the arc-shaped turnover portion is pressed into a plate-shaped opening portion having a plate structure and an included angle with a horizontal plane is between 15-60 degrees.

8. The flange cutting apparatus according to claim 7, wherein an inner wall surface of a junction of the cylinder wall and the plate-like opening portion is pressed by the second die core and a cutting step of the second punch to form an annular cutout, the second punch further comprising a second punch body, a second punch-in portion, a cutting portion between the second punch body and the second punch-in portion, and a relief portion formed between the second punch body and the cutting portion, an outer diameter of the second punch body being larger than an outer diameter of the cutting portion, an outer diameter of the cutting portion being larger than an outer diameter of the second punch-in portion, the cutting step being formed at a bottom surface outer periphery of the cutting portion.

9. The flange cutting apparatus according to claim 8, wherein the annular cutout surface at the top of the cylinder wall is pressed downward by the third punch bottom to break the plate-like opening of the metal work to complete the cutting.