CN112296155A - Seal head forming die and seal head forming method - Google Patents
Seal head forming die and seal head forming method Download PDFInfo
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- CN112296155A CN112296155A CN201910693867.2A CN201910693867A CN112296155A CN 112296155 A CN112296155 A CN 112296155A CN 201910693867 A CN201910693867 A CN 201910693867A CN 112296155 A CN112296155 A CN 112296155A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000003825 pressing Methods 0.000 claims abstract description 186
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000009966 trimming Methods 0.000 claims description 50
- 230000007704 transition Effects 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 24
- 230000007246 mechanism Effects 0.000 description 18
- 239000000463 material Substances 0.000 description 17
- 238000009957 hemming Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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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
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
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Abstract
The invention provides an end socket forming die and an end socket forming method, which are implemented through the end socket forming die, wherein the end socket forming die comprises a male die, a first edge pressing die and a second edge pressing die, the first edge pressing die is arranged around the outer side of the circumference of the male die, and the second edge pressing die is arranged corresponding to the first edge pressing die; the first edge pressing die moves towards the second edge pressing die, and the plate is pressed between the first edge pressing die and the second edge pressing die; and in the process of press forming, reducing the pressure of the first edge pressing die on the plate. The pressure of the first blank pressing die on the plate is reduced in the process of performing press forming on the plate by the male die, namely the clamping pressure of the first blank pressing die and the second blank pressing die on the plate is also reduced, so that the plate raw material between the first blank pressing die and the second blank pressing die moves towards the male die/die cavity, the speed of local stretching and thinning is further reduced, and the thickness of the formed end socket is more uniform. Therefore, on the basis of meeting the minimum thickness of each part of the end socket, the thickness of the plate raw material is reduced, and the raw material cost is reduced.
Description
Technical Field
The invention relates to an end socket forming technology, in particular to an end socket forming die and an end socket forming method.
Background
Tank bodies of tanks for containing goods are widely applied in the fields of storage and transportation of chemical products. The more common is the jar body that constitutes by the drum part in the middle of and the head part at both ends, and according to the size of volume, the diameter of drum and head can adopt multiple specification. The end socket is generally formed by pressing a plate. In the forming process, the plate is subjected to the pressing action of the male die to generate tensile deformation, and the formed plate is thinned to a certain degree relative to the original thickness.
At present, in the existing seal head forming process, after an upper blank-pressing die and a lower blank-pressing die clamp and fix the edge part of a plate, in the process of performing press forming on the plate by a male die, the clamping force of the upper blank-pressing die and the lower blank-pressing die on the edge part of the plate is basically kept unchanged, and the tension time of each part of the plate are different, which is a factor causing the thickness of each part of the formed seal head to be uneven.
To ensure that the minimum thickness of each part of the end socket must be greater than or equal to the minimum allowable thickness, a thicker plate is required as a forming raw material. Therefore, the requirement on the initial thickness of the raw material is high, and the material cost is high.
Disclosure of Invention
The invention provides a seal head forming die and a seal head forming method, aiming at solving the problems of uneven seal head forming thickness and high raw material cost in the prior art.
A seal head forming method, which is implemented by a seal head forming die,
the end socket forming die comprises a male die, a first edge pressing die and a second edge pressing die, wherein the first edge pressing die is arranged around the outer side of the male die, and the second edge pressing die is arranged corresponding to the first edge pressing die;
one surface of the first blank pressing die, which is opposite to the second blank pressing die, is provided with a curved surface bulge, and one surface of the second blank pressing die, which is opposite to the first blank pressing die, is provided with a curved surface groove matched with the curved surface bulge;
the plate is placed on the second edge pressing die, the first edge pressing die moves towards the second edge pressing die, and the plate is pressed between the first edge pressing die and the second edge pressing die;
and the male die is used for carrying out press forming on the plate, and in the process of press forming, the pressure of the first edge pressing die on the plate is reduced.
Further, the male die is used for performing press forming on the plate, and in the process of press forming, the pressure of the first trimming die on the plate is reduced, and the method comprises the following steps:
dividing the pressing moving stroke of the male die after contacting the plate into a plurality of stroke sections, and sequentially reducing the pressure before each stroke section starts according to the sequence of the stroke sections.
Further, the diameter of the end socket is 2000-2500 mm, and the thickness of the plate is 5-8 mm;
the plurality of stroke sections comprise a first stroke section from 0 mm to 100-230 mm, a second stroke section from 100-230 mm to 310-440 mm, a third stroke section from 310-440 mm to 380-510 mm and a fourth stroke section from 380-510 mm to 470-600 mm;
before the first stroke section begins, reducing the pressure to 25500-26500 kilonewtons;
before the second stroke section begins, reducing the pressure to 21500-22500 kilo-newtons;
reducing the pressure to 19500-20500 kilonewtons before the third process segment begins;
and before the fourth stroke section begins, reducing the pressure to 15500-16500 kilonewtons.
A head forming die for use in any one of the head forming methods described above, comprising the male die, the first trimming die, and the second trimming die;
the first edge pressing die is arranged around the outer side of the male die, the second edge pressing die is arranged corresponding to the first edge pressing die, the male die is used for performing press forming on the plate, and the first edge pressing die is used for pressing the plate on the second edge pressing die in a pressure-adjustable mode.
The first blank pressing die is provided with a curved surface bulge on one side opposite to the second blank pressing die, and the second blank pressing die is provided with a curved surface groove matched with the curved surface bulge on one side opposite to the first blank pressing die.
Furthermore, a first transition arc surface is arranged at the position, close to the male die, of the bottom of the first edge pressing die, and the first transition arc surface is smoothly connected with one side surface, close to the male die, of the second edge pressing die.
Furthermore, a second transition arc surface is arranged at the bottom of the first edge pressing die and is connected with the first transition arc surface in a smooth mode.
Furthermore, a boss is arranged at the position, close to the other side face opposite to the one side face, of the bottom of the first blank pressing die, and the boss abuts against the second blank pressing die to stop the first blank pressing die from moving continuously towards the second blank pressing die.
Further, a gap exists between one side face, close to the male die, of the second edge pressing die and the male die.
Furthermore, the male die is a revolving body, the first blank pressing die is annular and coaxial with the male die, and the second blank pressing die corresponds to the first blank pressing die and is annular.
And the female die and the second blank pressing die are fixedly arranged and are opposite to the male die.
According to the technical scheme, the invention has at least the following advantages and positive effects:
according to the end socket forming method, the pressure of the first blank pressing die on the plate is reduced in the process of performing press forming on the plate by the male die, namely the clamping pressure of the first blank pressing die and the second blank pressing die on the plate is reduced, so that the plate raw material between the first blank pressing die and the second blank pressing die moves towards the male die and the die cavity, the local excessive stretching and thinning are relieved, and the formed end socket is more uniform in thickness. Therefore, on the basis of meeting the minimum thickness of each part of the end socket, the thickness requirement on the plate raw material can be reduced, and the raw material cost is reduced. Moreover, because the thickness of each part of the end socket is uniform, the weight of the end socket can be reduced on the basis of meeting the minimum thickness of each part of the end socket. The design of the convex curved surface on the first blank pressing die and the design of the concave curved surface on the second blank pressing die can enable the plate part between the first blank pressing die and the second blank pressing die to move to the male die and the die cavity with proper friction force in the process of press forming.
Drawings
Fig. 1 is a schematic diagram of the steps of a head forming method according to an embodiment of the present invention.
Fig. 2 is a schematic view of a partial cross-sectional structural state of the head forming die according to an embodiment of the present invention, in which a sheet is placed on the second press die, and the male die and the first press die contact the sheet.
Fig. 3 and 6 are partially enlarged schematic views of the structure of fig. 2.
Fig. 4 is a partial sectional structural view of a conventional scheme in which a sheet material is placed on a blank holder lower die and the blank holder upper die contacts the sheet material.
Fig. 5 is a partially enlarged structural view of the first blank holder die in fig. 2.
The reference numerals are explained below:
1. a male die; 2. a first trimming die; 21. the curved surface is convex; 22. a first transition arc surface; 23. a second transition arc surface; 24. a boss; 3. a second trimming die; 31. a curved surface groove; 4. a plate material; 5. a gap.
Detailed Description
While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the disclosure and is not intended to limit the invention to that as illustrated herein.
Thus, a feature indicated in this specification will serve to explain one feature of an embodiment of the disclosure, and not to imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the head forming method of the present embodiment is performed by a head forming die. The seal head forming die comprises a male die 1, a first trimming die 2 and a second trimming die 3, wherein the first trimming die 2 is arranged around the outer side of the male die 2, and the second trimming die 3 is arranged corresponding to the first trimming die 2.
The one side that first hemming die 2 just right second hemming die 3 is equipped with curved surface arch 21, and the one side that second hemming die 3 just right first hemming die 2 is equipped with the curved surface recess 31 with the protruding 21 looks adaptations of curved surface. During the press forming process, the sheet material part between the first blank pressing die 2 and the second blank pressing die 3 is moved towards the male die and the die cavity with proper friction force.
In general, the second trimming die 3 is located below the first trimming die 2 and is fixed, so the second trimming die 3 is also called a lower trimming die. The first trimming die 2 is positioned over the second trimming die 3 and is also called as an upper trimming die. The first press mold 2 is movable in a lifting manner with respect to the second press mold 3 to press or unload the sheet 4.
The cross section of the tank body of the tank box, which is perpendicular to the axis, is generally circular, so that the end socket is a corresponding butterfly-shaped revolving body. Under the condition that the end socket is a corresponding butterfly-shaped revolving body, the male die 1 for manufacturing the end socket is also a corresponding revolving body, and the plate 4 is in a corresponding circular plate shape. The process steps of the head forming method of the present invention are described below with the punch 1 being a solid of revolution:
step S1, placing the plate on a second edge pressing die, moving the first edge pressing die to the second edge pressing die, and pressing the plate between the first edge pressing die and the second edge pressing die;
step S2, the male die is used for carrying out press forming on the plate, and in the process of press forming, the pressure of the first edge pressing die on the plate is reduced;
and step S3, releasing pressure and demoulding, taking down the formed end socket, and producing the end socket finished product through machining, shaping and trimming.
As described in step S1, the sheet 4 is first placed on the second trimming die 3. When the sheet material 4 is placed on the second press die 3, a portion of the sheet material 4 near the circumferential edge should be brought into contact with the second press die 3. Since the second press die 3 is annularly arranged in correspondence with the first press die 2, the sheet 4 is supported on the second press die 3 through its portion near the circumferential edge, while the circumferential center of the sheet 4 is opposed to the center of rotation of the punch 1.
The first blank pressing die 2 moves downwards under the driving of the blank pressing driving mechanism, so that the plate 4 is clamped and fixed between the first blank pressing die 2 and the second blank pressing die 3 through the edge part of the plate, and preparation is made for the next step of performing press forming on the plate 4 by the male die 1. Wherein the blank pressing driving mechanism is a thrust mechanism such as a hydraulic press.
As described in step S2, the punch 1 moves downward to contact and press the sheet material 4 under the driving of the forming driving mechanism, so that the sheet material 4 is formed into the shape of a head similar to the punch 1 by the pressing and stretching of the sheet material 4 by the punch 1. Wherein the forming driving mechanism is a thrust mechanism such as a hydraulic press. In the process of press forming, the blank pressing driving mechanism reduces the thrust on the first blank pressing die 2, so that the first blank pressing die 2 reduces the pressure on the plate 4, that is, the clamping force of the first blank pressing die 2 and the second blank pressing die 3 on the plate 4 is also reduced, and the edge part of the plate 4 between the first blank pressing die 2 and the second blank pressing die 3 moves towards the male die 1 and the die cavity.
As described in step S3 above, after the press forming of the sheet material 4 by the punch 1 is completed, the punch is lifted and returned by the forming drive mechanism. The first blank pressing die 2 is driven by the blank pressing driving mechanism to ascend, and pressure on the edge of the plate 4 is relieved. Thus, the pressed plate 4 is demoulded, and then the redundant edge part of the plate 4 is trimmed to obtain the end socket finished product through the subsequent process.
In the moving direction of the male die 1, included angles between tangent planes corresponding to the curved surfaces of the parts and the moving direction are different, the area of the male die contacting the plate and the acting time of the male die on the contacting parts are continuously increased, namely the pulling force and the pulling time of the plate are different, and the difference is a factor for causing the thickness of each part of the formed end socket to be uneven.
Through the steps of S1 and S2, in the process of press forming the sheet material 4 by the punch 1, the pressing force of the first trimming die 2 and the second trimming die 3 on the edge portion of the sheet material 4 is reduced, so that the sheet material 4 between the first trimming die 2 and the second trimming die 3 moves to the punch 1 and the die cavity, and further the local stretching and thinning are slowed down, and the thickness of the formed end socket is more uniform. Therefore, on the basis of meeting the minimum thickness of each part of the end socket, the thickness of the plate raw material is reduced, and the raw material cost is reduced. Moreover, because the thickness of each part of the end socket is uniform, the weight of the end socket can be reduced on the basis of meeting the minimum thickness of each part of the end socket.
Wherein, the step S2 of the punch 1 performing press forming on the plate 4 and reducing the pressure of the first trimming die 2 on the plate 4 during the press forming includes:
step S201, dividing the pressing moving stroke of the male die 1 after contacting the plate 4 into a plurality of stroke sections, and sequentially reducing the pressure before each stroke section starts according to the sequence of the stroke sections.
When the edge part of the plate 4 is pressed on the second edge pressing die 3 by the first edge pressing die 2, the edge pressing driving mechanism applies a large pressure to the first edge pressing die 2, so that the contact surfaces of the plate 4 and the curved surface protrusion 21 of the first edge pressing die 2 and the curved surface groove 31 of the second edge pressing die 3 are more attached to ensure the pressing effect.
As described in step S201 above, after the punch 1 is brought into contact with the sheet 4, the press movement stroke of the sheet 4 is divided into a plurality of stroke sections. And according to the sequence of the stroke sections, before each stroke section begins, the pressure of the first edge pressing die 2 on the plate 4 is sequentially reduced through the edge pressing driving mechanism. For example:
and dividing the pressing moving stroke of the male die 1 after contacting the plate 4 into a first stroke section, a second stroke section, a third stroke section and a fourth stroke section in sequence. Before the first stroke section of the male die 1 for pressing the plate 4 is started, the pressure of the first trimming die 2 for pressing the plate 4 is reduced a little, and then the male die 1 moves downwards to finish the first stroke section of pressing. After the first stroke section is completed and before the second stroke section is started, the pressure of the first hemming die 2 on the plate 4 is reduced by a little, and the second stroke section is completed. And repeating the steps until the last stroke section is finished, and finishing the whole stroke of the male die for pressing and forming the plate.
In the moving direction of the male die 1, the included angles between the tangent plane corresponding to each part of the curved surface and the moving direction are different. The included angle between the tangent plane close to the top point of the male die 1 and the moving direction is larger, and the included angle between the tangent plane far away from the top point of the male die 1 and the moving direction is smaller. The plate 4 is subjected to greater and greater tension as the pressing stroke of the male die 1 on the plate 4 increases. Through the mode of reducing the pressure of the first blank pressing die 2 on the plate 4 in stages, the plate raw material clamped between the first blank pressing die 2 and the second blank pressing die 3 can move towards the male die 1 and the die cavity, and the trend that the plate 4 is locally thinned rapidly due to the fact that the plate is subjected to larger and larger pulling force is effectively relieved.
The first embodiment is as follows:
the diameter of the end socket product is required to be 2000 mm, the initial pressure of the first edge pressing die 2 on the plate 4 is 28000 kilonewtons, and four stroke sections of the male die 1 are divided as follows:
the first stroke is from 0 mm to 100 mm after the punch 1 contacts the sheet 4, the second stroke is from 100 mm to 310 mm from the punch 1, the third stroke is from 310 mm to 380 mm from the punch 1, and the fourth stroke is from 380 mm to 470 mm from the punch 1.
Before the beginning of each stroke, the pressure reduction of the first trimming die 2 on the sheet 4 is adjusted as follows:
reducing the pressure to 25500 kn before the beginning of the first stroke segment;
reducing the pressure to 21500 kn before the beginning of the second stroke segment;
reducing the pressure to 19500 kn before the third segment begins;
before the start of the fourth stroke segment, the pressure was reduced to 15500 kn.
And (4) according to the parameter settings, preparing the end socket product through a forming process.
Through actual measurement, the thickness of the plate raw material is 8 mm, so that the thickness of each part of the formed end socket can meet the minimum thickness requirement, and the thickness of each part of the formed end socket can meet the minimum thickness requirement only when the plate raw material is required to be at least 8.3 mm in the common end socket forming process, namely, the thickness of the plate raw material can be at least reduced by 0.3 mm through the parameter setting of the process.
Example two:
the diameter of the end socket product is required to be 2500 mm, the initial pressure of the first edge pressing die to the plate is 28000 kilonewtons, and four stroke sections of the male die 1 are divided as follows:
the first stroke is from 0 mm to 230 mm after the punch 1 contacts the sheet 4, the second stroke is from 230 mm to 440 mm from the punch 1, the third stroke is from 440 mm to 510 mm from the punch 1, and the fourth stroke is from 510 mm to 600 mm from the punch 1.
Before the beginning of each stroke, the pressure reduction of the first trimming die 2 on the sheet 4 is adjusted as follows:
reducing the pressure to 26500 kn before the beginning of the first stroke segment;
reducing the pressure to 22500 kn before the start of the second stroke segment;
reducing the pressure to 20500 kn before the third stroke segment begins;
before the start of the fourth stroke segment, the pressure was reduced to 16500 kn.
And (4) according to the parameter settings, preparing the end socket product through a forming process.
According to actual measurement, the thickness of the plate raw material is 6 mm, so that the thickness of each part of the formed end socket can meet the minimum thickness requirement, and the thickness of each part of the formed end socket can meet the minimum thickness requirement only when the plate raw material is required to be at least 6.25 mm in the common end socket forming process, namely, the thickness of the plate raw material can be at least reduced by 0.25 mm through the parameter setting of the process.
Example three:
the diameter of the end socket product is required to be 2380 mm, the initial pressure of the first edge pressing die on the plate is 28000 kilonewtons, and four stroke sections of the male die are divided as follows:
the first stroke is from 0 mm to 200 mm after the punch 1 contacts the sheet 4, the second stroke is from 200 mm to 410 mm after the punch 1 contacts the sheet, the third stroke is from 410 mm to 480 mm after the punch 1 contacts the sheet, and the fourth stroke is from 480 mm to 570 mm after the punch 1 contacts the sheet.
Before the beginning of each stroke, the pressure reduction of the first trimming die 2 on the sheet 4 is adjusted as follows:
reducing the pressure to 26000 kn before the beginning of the first stroke segment;
reducing the pressure to 22000 kn before the second stroke section begins;
reducing the pressure to 20000 kn before the third stroke segment begins;
before the start of the fourth stroke segment, the pressure is reduced to 16000 kn.
The stroke and pressure parameters are set as follows:
TABLE 1 Stroke and pressure parameters
And (4) according to the parameter settings, preparing the end socket product through a forming process.
According to actual measurement, the thickness of the plate raw material is 5.4 mm, so that the thickness of each part of the formed seal head can meet the minimum thickness requirement, and the thickness of each part of the formed seal head can meet the minimum thickness requirement only when the plate raw material is required to be at least 5.6 mm in the common seal head forming process, namely, the thickness of the plate raw material can be at least reduced by 0.20 mm through the parameter setting of the process.
In other embodiments, the pressure of the first blank pressing die against the sheet material can be gradually and continuously reduced in the whole pressing moving process after the male die contacts the sheet material.
With continued reference to fig. 2, the invention further provides a head forming mold for implementing the head forming method, which comprises a male mold 1, a female mold, a first edge pressing mold 2, a second edge pressing mold 3, a forming driving mechanism and an edge pressing driving mechanism. The first trimming die 2 is arranged around the outer side of the circumference of the male die, and the second trimming die 3 is arranged corresponding to the first trimming die 2.
The male die 1 is a revolving body, the first trimming die 2 is annular and coaxial with the male die 1, and the second trimming die 3 is annular and corresponds to the first trimming die 2. The female die is opposite to the male die 1 and is fixedly arranged on the lower die seat together with the second trimming die 3.
The forming driving mechanism drives the male die 1 to complete the press forming of the plate 4, and the blank pressing driving mechanism drives the first blank pressing die 2 to press the plate 4 between the first blank pressing die 2 and the second blank pressing die 3 with adjustable pressure. The edge pressing drive mechanism and the forming drive mechanism can be specifically hydraulic cylinders.
Therefore, in the process of pressing the plate 4 downwards by the male die 1 driven by the forming driving mechanism, the pressing force of the first edge pressing die 2 on the edge part of the plate 4 is reduced, so that the plate 4 raw material between the first edge pressing die 2 and the second edge pressing die 3 moves towards the male die 1 and the die cavity, and further local stretching and thinning are slowed down, the thickness of the formed seal head is more uniform, on the basis of meeting the minimum thickness of each part of the seal head, the thickness of the plate 4 raw material is reduced, and the raw material cost and the weight of the finished seal head are reduced.
Referring to fig. 3 and 4, a curved surface protrusion 21 is arranged on one surface of the first trimming die 2, which faces the second trimming die 3, the curved surface protrusion 21 is cut by taking the plane where the axis of the male die 1 is located as a cross section, and the edge of the cut surface of the curved surface protrusion 21 is a smooth curve. One surface of the second trimming die 3, which is opposite to the first trimming die 2, is provided with a curved surface groove 31 matched with the curved surface bulge 21. The curved surface that corresponds on first blank pressing mould 2 and the second blank pressing mould 3 sets up is protruding 21 and curved surface recess 31, can not only reliably compress tightly 4 marginal portions of panel, and the flat bottom recess of the mould of the relative conventional blank pressing lower mould and the flat bottom that the mould corresponds and set up on the blank pressing are protruding, can make 4 protruding deformation become the in-process of head shape of panel 4 downwards at terrace die 1 downpressing panel, reduce the resistance that 4 marginal portion materials of panel that clip between first blank pressing mould 2 and the second blank pressing mould 3 removed to terrace die 1 and die cavity.
The bottom of the first trimming die 2 is provided with a boss 24 near the other side surface, and the boss 24 is propped against the second trimming die 3 to stop the first trimming die 2 from moving continuously towards the second trimming die 3. Furthermore, a certain gap is formed between the bottom of the first blank pressing die 2 and the second blank pressing die 3 except for the contact part of the boss 24, so that the pressure of the first blank pressing die 2 on the plate 4 is prevented from exceeding a set range.
Referring to fig. 5, a first transition arc surface 22 is arranged at the bottom of the first blank pressing die 2 close to the male die 1, and the first transition arc surface 22 is smoothly connected with one side surface of the second blank pressing die 3 close to the male die 1. The first transition arc surface 22 may specifically be a circular arc chamfer at the intersection of the bottom surface of the first trimming die 2 and the side surface close to the punch 1. And a second transition arc surface 23 is arranged at the bottom of the first blank pressing die 2, one end of the second transition arc surface 23 is smoothly connected with the first transition arc surface 22, and the other end of the second transition arc surface 23 is smoothly connected with the bottom surface of the first blank pressing die and the part close to the bottom surface of the first blank pressing die.
When the first trimming die 2 presses the edge part of the plate 4 downwards, due to the extrusion effect of the curved surface protrusion 21 of the first trimming die 2 and the curved surface groove 31 of the second trimming die 3, the part, close to the edge, of the plate 4 is bent into a shape matched with the curved surface protrusion 21 and the curved surface groove 31, and then in the pressing process, the rest part of the plate 4 tilts upwards, and the arrangement of the first transition arc surface 22 and the second transition arc surface 23 can effectively reduce the friction of the bottom edge of the first trimming die 2 on the plate 4.
Referring to fig. 6, a gap 5 exists between one side surface of the second blank pressing die 3 close to the male die 1 and the male die 1, and provides a space for the part of the sheet 4 pressed between the first blank pressing die 2 and the second blank pressing die 3 to move towards the male die 1 and the die cavity. The size of the gap 5 is based on the standard that the gap can provide space for the movement of the plate 4 and has proper friction force, and the size of the gap 5 is set between 5.5 mm and 9.5 mm according to different plates, so as to ensure that the plate moves with proper friction force.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A seal head forming method is characterized in that the seal head forming method is implemented by a seal head forming die,
the end socket forming die comprises a male die, a first edge pressing die and a second edge pressing die, wherein the first edge pressing die is arranged around the outer side of the male die, and the second edge pressing die is arranged corresponding to the first edge pressing die;
one surface of the first blank pressing die, which is opposite to the second blank pressing die, is provided with a curved surface bulge, and one surface of the second blank pressing die, which is opposite to the first blank pressing die, is provided with a curved surface groove matched with the curved surface bulge;
the plate is placed on the second edge pressing die, the first edge pressing die moves towards the second edge pressing die, and the plate is pressed between the first edge pressing die and the second edge pressing die;
and the male die is used for carrying out press forming on the plate, and in the process of press forming, the pressure of the first edge pressing die on the plate is reduced.
2. A head forming method according to claim 1, wherein the male die performs press forming on the plate, and the reducing of the pressure of the first edge pressing die on the plate during the press forming comprises:
dividing the pressing moving stroke of the male die after contacting the plate into a plurality of stroke sections, and sequentially reducing the pressure before each stroke section starts according to the sequence of the stroke sections.
3. An end socket forming method according to claim 2, wherein the diameter of the end socket is 2000-2500 mm, and the thickness of the plate is 5-8 mm;
the plurality of stroke sections comprise a first stroke section from 0 mm to 100-230 mm, a second stroke section from 100-230 mm to 310-440 mm, a third stroke section from 310-440 mm to 380-510 mm and a fourth stroke section from 380-510 mm to 470-600 mm;
before the first stroke section begins, reducing the pressure to 25500-26500 kilonewtons;
before the second stroke section begins, reducing the pressure to 21500-22500 kilo-newtons;
reducing the pressure to 19500-20500 kilonewtons before the third process segment begins;
and before the fourth stroke section begins, reducing the pressure to 15500-16500 kilonewtons.
4. The end socket forming die is characterized by comprising the male die, the first trimming die and the second trimming die;
the first edge pressing die is arranged around the outer side of the male die, the second edge pressing die is arranged corresponding to the first edge pressing die, the male die is used for performing press forming on the plate, and the first edge pressing die is used for pressing the plate on the second edge pressing die in a pressure-adjustable mode.
The first blank pressing die is provided with a curved surface bulge on one side opposite to the second blank pressing die, and the second blank pressing die is provided with a curved surface groove matched with the curved surface bulge on one side opposite to the first blank pressing die.
5. A head forming die according to claim 4, wherein a first transition arc surface is arranged at the bottom of the first edge pressing die close to the male die, and the first transition arc surface is smoothly connected with one side surface of the second edge pressing die close to the male die.
6. A head forming die according to claim 5, wherein a second transition arc surface is arranged at the bottom of the first edge pressing die and is smoothly connected with the first transition arc surface.
7. A head forming die according to claim 4, wherein a boss is arranged at the bottom of the first blank pressing die close to the other side face opposite to the one side face, and the boss abuts against the second blank pressing die to stop the first blank pressing die from moving further towards the second blank pressing die.
8. A head forming die according to claim 4, wherein a gap exists between one side of the second blank pressing die close to the male die and the male die.
9. A head forming die according to claim 4, wherein the male die is a solid of revolution, the first blank pressing die is annular and coaxial with the male die, and the second blank pressing die is annular corresponding to the first blank pressing die.
10. A head forming die according to claim 4, further comprising a female die, wherein the female die is fixedly arranged with the second blank holding die and is opposite to the male die.
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| CN201910693867.2A CN112296155A (en) | 2019-07-30 | 2019-07-30 | Seal head forming die and seal head forming method |
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| CN201910693867.2A CN112296155A (en) | 2019-07-30 | 2019-07-30 | Seal head forming die and seal head forming method |
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| CN115740142A (en) * | 2022-11-24 | 2023-03-07 | 湘阴中研新材料科技有限公司 | Automatic steel-plastic composite board blank pressing equipment with feeding and adjusting functions |
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