CN117723367A - Gear ring-containing plate forming limit test die and application method thereof - Google Patents
Gear ring-containing plate forming limit test die and application method thereof Download PDFInfo
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- CN117723367A CN117723367A CN202311697968.XA CN202311697968A CN117723367A CN 117723367 A CN117723367 A CN 117723367A CN 202311697968 A CN202311697968 A CN 202311697968A CN 117723367 A CN117723367 A CN 117723367A
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- forming limit
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- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 35
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 14
- 210000001624 hip Anatomy 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000007493 shaping process Methods 0.000 claims 1
- 239000000523 sample Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 239000011324 bead Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000006101 laboratory sample Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention relates to a plate forming limit test die with a gear ring and a use method thereof, wherein the die comprises a blank holder and a female die, the end face of one side of the blank holder, which faces the female die, is annularly provided with the gear ring, the section of the gear ring is in an isosceles trapezoid shape, and the width of the isosceles trapezoid, which is close to the bottom plate of the female die, is smaller than the width of the bottom plate, which is far away from the female die; the using method comprises the following steps: placing a metal sheet sample between a female die and a blank holder containing a gear ring; starting a blank pressing oil cylinder to enable the gear ring to be in contact with the metal plate sample, enabling the metal plate sample to be in contact with the female die, and forming a proper blank pressing force and keeping; and starting a punch cylinder to enable the punch to penetrate through the gear ring to perform forming limit test on the sheet metal sample. Compared with the prior art, the invention can carry out forming limit test on the thick metal plate, and can keep the thick metal plate sample uniformly stressed and firmly clamped in the test process.
Description
Technical Field
The invention relates to the technical field of sheet metal forming limit test, in particular to a sheet metal forming limit test die with a gear ring and a using method thereof.
Background
The forming limit performance of the plate is an important index parameter for measuring the plastic mechanical property of the plate, and the forming limit performance directly reflects the maximum deformation capacity of the plate before stretching instability. The forming limit diagram (Forming limit Diagram, FLD) is the most important judgment basis of the forming limit of the plate, and particularly, the forming limit diagram is combined with the finite element numerical simulation technology, so that the forming limit diagram has the characteristics of accuracy, rapidness and intuitiveness, and therefore, a plurality of commercial finite element software take the forming limit diagram as the main basis for predicting the breaking limit in the stamping process and the die design. The accurate forming limit diagram of the material is an important precondition for ensuring the accuracy and reliability of the analysis result, and the accurate forming limit diagram is required to be obtained through experiments.
At present, all steel enterprises only consider FLD of thin plates (with thickness smaller than 3 mm) when researching and establishing a plate database, and the FLD forming test of thick plates cannot realize reasonable and accurate measurement and test at present. In actual production, a plurality of thick plates need to be punched and simulated, and accurate thick plate FLD curves can ensure the accuracy of punching and simulation and improve the production efficiency.
The plate forming limit test is to obtain the forming limit of the material through a ball head bulging test, in the ball head bulging process, a test sample needs to be pressed by a blank holder and a female die in the blank holder area and does not flow towards the center, a drawing bead is mainly arranged on the blank holder or the blank holder force is directly increased, so that the test sample does not flow towards the center as much as possible, the traditional forming limit test die is mainly designed for a thin plate (with the thickness smaller than 3 mm), and for the plate with the thickness larger than 3mm, the test sample is difficult to press through the drawing bead and flows towards the center, so that the forming limit of the plate cannot be obtained.
Disclosure of Invention
The invention aims to provide a plate forming limit test die with a gear ring and a using method thereof.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a board forming limit test mould that contains ring gear, includes blank holder and die, the blank holder is equipped with the ring gear in the one side terminal surface ring towards the die, and the cross-section of ring gear is isosceles trapezoid, and isosceles trapezoid is close to die side bottom plate width and is less than and keeps away from die side bottom plate width.
Preferably, a plurality of gear rings are arranged on the concentric ring of the end face of the blank holder.
Further preferably, the ring gear located at the outer ring is higher than the ring gear of the inner ring.
Preferably, the tooth height and angle of the gear ring are determined according to the thickness and hardness of the plate material.
The specific method comprises the following steps: and combining finite element calculation, wherein the rule height and the thickness of the plate material have a linear relation, the tooth height is H, the thickness of the plate material is T, and H=alpha T is present, and the alpha value range is 0.15-0.4.
Further preferably, the interval between adjacent ring gears is 7 to 9mm.
Preferably, the width of the gear ring close to the bottom plate at the side of the female die is 0.1-0.3 mm.
Preferably, the included angle between the two waists of the isosceles trapezoid is 60-120 degrees.
Further preferably, the included angle between the two waists of the isosceles trapezoid is 85-95 degrees.
Still further preferably, the angle between the two waists of the isosceles trapezoid is 90 °.
Preferably, the gear ring protrudes toward the female die side, and the protruding height is 1-1.5 mm.
Preferably, the blank holder is arranged on the blank holder oil cylinder, the punch is penetrated on the inner side of the blank holder, and the punch is arranged on the punch oil cylinder.
Preferably, the female die is mounted on a mount.
Preferably, the gear ring material is SKD11.
The application method of the plate forming limit test die with the gear ring comprises the following steps:
placing a metal sheet sample between a female die and a blank holder containing a gear ring;
starting a blank pressing oil cylinder to enable the gear ring to be in contact with the metal plate sample, enabling the metal plate sample to be in contact with the female die, and forming a proper blank pressing force and keeping;
and starting a punch cylinder to enable the punch to penetrate through the gear ring to perform forming limit test on the sheet metal sample.
Preferably, the blank holder force is 500-1000 KN.
Preferably, the thickness of the sheet metal test piece is not less than 3mm.
Further preferably, the thickness of the sheet metal test piece is 3 to 6mm.
In the invention, the gear ring is stressed on the metal plate sample in advance.
In the actual test process, the gear ring on the blank holder can bite into the plate, so that the plate can be nailed and prevented from flowing towards the center, the middle of the plate is ensured to be broken by the upward top of the punch, and accurate and effective forming limit data are obtained. If the sheet material flows to the center, the sheet material can not crack in the limit stroke of the punch head, and the forming limit data of the sheet material can not be obtained.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention ensures the stress of the metal plate forming limit test sample, and the stress is more reliable;
2. the invention ensures that the metal plate forming limit test sample is uniformly stressed in the edge pressing ring area, can bite the plate material and does not flow towards the center, and can ensure that the FLD test of the metal plate material is more accurate;
3. the die can carry out forming limit test on the thick metal plate, and can keep the thick metal plate sample uniformly stressed and firmly clamped in the test process.
Drawings
FIG. 1 is an assembly view of a plate forming limit test die with a gear ring according to the present invention;
FIG. 2 is a schematic structural view of a punch;
FIG. 3 is a schematic view of the structure of the blank holder;
FIG. 4 is a schematic view of a gear ring
FIG. 5 is a schematic diagram of the structure of the female die;
in the figure: 1-blank holder, 11-gear ring, 2-female die, 3-blank holder cylinder, 4-punch, 5-punch cylinder, 6-fixing frame and 7-sheet metal sample.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
A plate forming limit test die with a gear ring comprises a blank holder 1 and a female die 2 arranged above the blank holder 1.
The edge pressing ring 1 is provided with a gear ring 11 on one side end face facing the female die 2 in a ring mode, the section of the gear ring 11 is an isosceles trapezoid, the width of a bottom plate (an upper bottom plate) of the isosceles trapezoid, which is close to the female die 2, is smaller than that of a bottom plate (a lower bottom plate) of the side, which is far away from the female die 2, namely, the tooth shape of the gear ring 11 is of a structure with a small upper part and a big lower part.
Example 2
Referring to fig. 1, the embodiment provides a forming limit test tool for a thick metal plate.
The sheet metal sample 7 is a laboratory sample, and the forming limit test tool consists of clamping mechanisms such as a punch 4 (shown in fig. 2), a blank holder 1 (shown in fig. 3) containing a gear ring 11, a die 2 (shown in fig. 5) and the like.
The female die 2 of the forming limit testing tool is arranged on the fixed frame 6, the blank holder 1 with the gear ring 11 is arranged on the blank holder cylinder 3, and the punch 4 is arranged on the punch cylinder 5; the metal plate sample 7 is placed between the female die 2 and the blank holder 1 containing the gear ring 11 according to test requirements and is contacted with the gear ring 11 of the blank holder 1 containing the gear ring 11; starting the edge pressing oil cylinder 3 to move upwards to enable the gear ring 11 to be in contact with the metal plate sample 7, enabling the metal plate sample 7 to be in contact with the female die 2, forming proper edge pressing force and keeping, and starting the punch oil cylinder 5 to move upwards to perform forming limit test; after the test is finished, the edge pressing cylinder 3 is started to move downwards to separate the edge pressing ring 1 containing the gear ring 11 from the metal plate sample 7, the punch cylinder 5 is started to move downwards to separate the punch 4 from the metal plate sample 7, and the metal plate sample 7 is separated from the die 2; the sample was taken out for further investigation.
In this embodiment, the blank holder cylinder 3, the punch cylinder 5 and the fixing frame 6 are existing devices, and no motion description is made.
Example 3
A limit test fixture for forming of thick metal plates is characterized in that two gear rings 11 are arranged on a blank holder 1 in a concentric ring mode, as shown in fig. 4, the tooth height of each gear ring 11 positioned on the outer ring is 1.2mm, the tooth top width is 0.25mm, the tooth height of each gear ring 11 positioned on the inner ring is 1mm, the tooth top width is 0.2mm, and the distance between tooth top centers of adjacent gear rings 11 is 8mm. Both ring gears 11 are 90 deg.. The remainder was the same as in example 2.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a board shaping limit test mould that contains ring gear, its characterized in that includes blank holder (1) and die (2), blank holder (1) are equipped with ring gear (11) in the one side terminal surface ring towards die (2), and the cross-section of ring gear (11) is isosceles trapezoid, and isosceles trapezoid is close to die (2) side bottom plate width and is less than and keeps away from die (2) side bottom plate width.
2. The plate forming limit test die with the gear ring according to claim 1, wherein a plurality of gear rings (11) are arranged on concentric rings of the end face of the blank holder (1).
3. The sheet metal forming limit test die with the ring gear according to claim 2, wherein the ring gear (11) located at the outer ring is higher than the ring gear (11) located at the inner ring.
4. The gear ring-containing sheet material forming limit test die according to claim 2, wherein the interval between adjacent gear rings (11) is 7 to 9mm.
5. The plate forming limit test die with the gear ring according to claim 1, wherein the width of the side bottom plate of the gear ring (11) close to the female die (2) is 0.1-0.3 mm.
6. The gear ring-containing sheet material forming limit test die according to claim 1, wherein an included angle between two waists of the isosceles trapezoid is 60-120 °.
7. The plate forming limit test die with the gear ring according to claim 1, wherein the gear ring (11) protrudes toward the female die (2) side with a protruding height of 1 to 1.5mm.
8. The plate forming limit test die with the gear ring according to claim 1, wherein the blank holder (1) is arranged on a blank holder cylinder (3), a punch (4) is arranged on the inner side of the blank holder (1) in a penetrating manner, and the punch (4) is arranged on a punch cylinder (5).
9. The plate forming limit test die with the gear ring according to claim 1, wherein the female die (2) is mounted on a fixing frame (6).
10. A method of using the gear ring-containing sheet material forming limit test die set forth in any one of claims 1 to 9, comprising the steps of:
placing a metal sheet sample (7) between the female die (2) and the blank holder (1) containing the gear ring (11);
starting the blank pressing cylinder (3) to enable the gear ring (11) to be in contact with the metal plate sample (7), enabling the metal plate sample (7) to be also in contact with the female die (2), and forming a proper blank pressing force and keeping;
and starting the punch cylinder (5) to enable the punch (4) to penetrate through the gear ring (11) to perform forming limit test on the sheet metal sample (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311697968.XA CN117723367A (en) | 2023-12-12 | 2023-12-12 | Gear ring-containing plate forming limit test die and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311697968.XA CN117723367A (en) | 2023-12-12 | 2023-12-12 | Gear ring-containing plate forming limit test die and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117723367A true CN117723367A (en) | 2024-03-19 |
Family
ID=90206407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311697968.XA Pending CN117723367A (en) | 2023-12-12 | 2023-12-12 | Gear ring-containing plate forming limit test die and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117723367A (en) |
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2023
- 2023-12-12 CN CN202311697968.XA patent/CN117723367A/en active Pending
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