CN108265248B - Method and device for improving sheet forming performance through bidirectional compression - Google Patents
Method and device for improving sheet forming performance through bidirectional compression Download PDFInfo
- Publication number
- CN108265248B CN108265248B CN201810048902.0A CN201810048902A CN108265248B CN 108265248 B CN108265248 B CN 108265248B CN 201810048902 A CN201810048902 A CN 201810048902A CN 108265248 B CN108265248 B CN 108265248B
- Authority
- CN
- China
- Prior art keywords
- block
- angle
- plate
- groove
- transition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
the invention discloses a method and a device for improving the forming performance of a plate by bidirectional compression, which comprises a base, a first transition block, a clamping mechanism, a second transition block, a loading block and a pressure head, wherein the first transition block and the second transition block are oppositely arranged, the opposite side surfaces are provided with a first right-angle groove and a second right-angle groove, and the first transition block and the second transition block are respectively meshed with the upper surface of the base and the lower surface of the pressure head through tooth-shaped structures to form a rotary connection relationship; the clamping mechanism comprises two rectangular clamping plates which are oppositely arranged in front and back; two adjacent edges of the clamping plate close to the first transition block are attached to the first right-angle groove and connected through a right-angle connecting block, and the opening of the right-angle connecting block faces the second right-angle groove; the loading block is arranged between the clamping plates, is positioned on two adjacent sides of the clamping plates far away from the right-angle connecting block, protrudes out of the clamping mechanism, and the protruding side wall is attached to the second right-angle groove; the right-angle connecting block and the clamping plate surround a cavity for placing plates. The bidirectional compression loading proportion of the plate can be conveniently adjusted, and the bidirectional compression loading proportion adjusting device is simple in structure and low in cost.
Description
Technical Field
the invention relates to a physical property testing technology, in particular to a method and a device for improving the forming performance of a plate by bidirectional compression.
Background
In recent years, the usage amount of high-strength sheet forming materials is greatly increased, and in order to improve the finished product utilization rate and forming performance of sheet parts and save cost as much as possible, the forming capability of the sheet is required to be improved as much as possible.
The plates used for press forming are mostly rolled plates. The rolled sheet, especially magnesium alloy sheet, has extremely strong rolling basal plane texture. The texture type causes great difference in mechanical properties of the magnesium alloy plate in the plate surface direction and the direction vertical to the plate surface, namely, the magnesium alloy plate has extremely strong anisotropy, so that the deformation of the magnesium alloy plate in the plate surface in the forming process is difficult to obtain the coordinated deformation in the thickness direction. The formability of magnesium alloys is greatly limited.
the current ways for improving the forming performance of the magnesium alloy sheet material are as follows:
1) Raising the temperature of stamping
A number of documents indicate that magnesium alloys can activate the non-basal surface slip system in the matrix when the temperature reaches above 150 ℃. The large amount of start of the non-basal plane sliding system can promote the coordinated deformation of the thickness direction of the plate to the in-plane direction of the plate, thereby improving the forming performance of the plate. However, the increased temperature is accompanied by a significant increase in production costs. The die and the magnesium alloy plate can generate different thermal expansions due to different specific heat coefficients at high temperature, so that the design difficulty of the die is increased, and high-precision and high-efficiency production is difficult to carry out.
2) alloying
by adding the rare earth elements, the stacking fault energy of the magnesium alloy plate can be reduced, the non-basal plane slippage and the twinning starting are promoted, and the thickness direction is increased to provide coordination for the deformation in the plate surface direction. However, the rare earth alloying cost of magnesium alloy is also rising rapidly due to the gradual increase of rare earth market conditions in China.
3) By special forming means
The multi-point progressive forming mode developed in recent years can effectively improve the forming performance of the plate. The multi-point progressive forming adopts a multi-pass or multi-point progressive loading die, so that all parts of the plate can be deformed more fully, the deformation nonuniformity of the plate is reduced, and the stamping performance of the plate is improved. However, the progressive forming requires a complicated forming die and a precise matching processing technique, and is difficult to popularize in a wide range at low cost. Other special forming modes such as ultrasonic-assisted forming and the like can also improve the forming performance of the magnesium alloy plate to a certain extent, but all have the defects which are difficult to overcome.
Therefore, the development of the novel process and the novel device for improving the forming performance of the plate has great significance for the large-range application of the magnesium alloy plate.
disclosure of Invention
the invention aims to provide a method and a device for improving the forming performance of a plate by bidirectional compression, which can conveniently adjust the bidirectional compression loading proportion of the plate, and have simple structure and low cost.
The invention relates to a method for improving the forming performance of a plate by bidirectional compression, which comprises the following steps:
1) Processing a plate to be processed into a rectangle, then performing bidirectional synchronous pre-compression on the rectangular plate, wherein the pre-compression deformation is determined according to the material of the plate;
2) Annealing the plate pre-compressed in the step 1) to remove stress concentration.
furthermore, the plate is made of magnesium alloy, and the pre ~ compression deformation amount is 3.5 ~ 5%.
further, the annealing temperature in the step 2) is 350 +/~ 20 ℃, and the annealing time is 0.5 ~ 1 h.
Further, in the step 1), notches are arranged at corners of adjacent sides to be compressed of the rectangular plate to be processed, so that cracking caused by gathering of material flowing at the notches in the compression process is reduced.
a device for improving the forming performance of a plate by bidirectional compression comprises a base, a first transition block, a clamping mechanism, a second transition block, a loading block and a pressure head; the first transition block and the second transition block are arranged oppositely, and the opposite side surfaces are respectively provided with a first right-angle groove and a second right-angle groove; the first transition block and the second transition block are respectively meshed with the upper surface of the base and the lower surface of the pressure head through tooth-shaped structures to form a rotary connection relation; the clamping mechanism is positioned between the first transition block and the second transition block and comprises two rectangular clamping plates which are oppositely arranged in front and back; two adjacent edges of the clamping plate close to the first transition block are respectively attached to the first right-angle groove and are connected through a right-angle connecting block, and the opening of the right-angle connecting block faces to the second right-angle groove; the loading blocks are arranged between the clamping plates, are respectively positioned on two adjacent sides of the clamping plates, which are far away from the right-angle connecting block, have the same trend with the adjacent sides of the clamping plates, protrude out of the clamping mechanism, and the protruding side walls of the loading blocks are respectively attached to the second right-angle grooves; the right angle connecting block and the clamping plate surround to form a cavity for placing the plates, when the plates are placed in the cavity, the side edges are respectively attached to the right angle connecting block and the loading block, and the front side face and the rear side face are attached to the clamping plate.
Further, the base upper surface is equipped with first flute profile groove, and its transversal arc is personally submitted to the base, first transition piece lower part is the first sector gear with first flute profile groove meshing.
Furthermore, the lower surface of the pressure head is provided with a second toothed groove, the cross section of the second toothed groove is arc-shaped, and the upper part of the second transition block is provided with a second sector gear meshed with the second toothed groove.
Furthermore, the right-angle connecting block and the clamping plate at the rear part are of an integral structure. The structural strength of the clamping mechanism is improved.
furthermore, the corner of the clamping plate attached to the first right-angle groove, the corner of the clamping plate matched with the loading block and the corner of the right-angle connecting block far away from the plate are in smooth transition through circular arcs.
furthermore, the outer corners of the first right-angle groove and the second right-angle groove are in smooth transition through arcs.
During specific operation, put rectangle panel in clamping mechanism and press from both sides tightly, the breach is towards the top, panel left side downside and right downside are the laminating of right angled inclined plane with two of right angle connecting block, panel left side upside and upper right side laminate with the loading piece respectively, clamping mechanism wholly arranges the first right angle inslot of first transition piece in, rotate and adjust first transition piece, second transition piece and clamping mechanism, make the vertical diagonal of panel personally submit certain angle with the level, in order to realize the regulation of different loading proportions, the loading proportion is relevant with vertical diagonal inclination, rotate and adjust second transition piece, then pass through driving motor drive head downstream, the second right angle groove of second transition piece is two right angled inclined planes and laminates with two loading pieces respectively, the realization is to the two-way synchronous loading of panel.
Compared with the prior art, the invention has the following beneficial effects:
1. the method for improving the forming performance of the plate by bidirectional compression aims at improving the forming performance of the plate with different material components, and effectively improves the stamping forming performance of the plate.
2. the device for improving the forming performance of the plate by bidirectional compression has simple structure, is convenient to process and maintain, and can better complete the bidirectional compression of the plate; the bidirectional compression loading proportion of the plate can be conveniently adjusted; and the structure is simple, and the manufacturing cost is lower.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is one of the working diagrams of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a second schematic diagram of the present invention;
FIG. 5 is a third schematic diagram of the present invention;
fig. 6 is a cupping test graph of the test group and the control group, the abscissa is the punching depth, the ordinate is the load, a is the cupping value of the test group, and b is the cupping value of the control group.
In the figure, 1-base, 11-first tooth-shaped groove, 2-first transition block, 21-first sector gear, 22-first right-angle groove, 3-pressure head, 31-second tooth-shaped groove, 4-second transition block, 41-second sector gear, 42-second right-angle groove, 5-clamping plate, 6-right-angle connecting block, 7-loading block, 8-plate, 9-bolt.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
In a first embodiment, a method for improving sheet forming performance by bidirectional compression comprises the following steps:
1) Taking an AZ31 magnesium alloy rolled plate with the thickness of 1mm, dismantling and shearing the AZ31 magnesium alloy rolled plate into a square, wherein the side length of the square plate is 62mm, and a notch is arranged at a corner of an adjacent side to be compressed of the plate so as to reduce cracking caused by gathering of material flowing at the notch in the compression process, wherein the notch is square and the side length is 4 mm;
2) annealing the disassembled and sheared plate at 350 ℃ for 1h to eliminate residual stress in the plate and make the structure more uniform;
3) Overlapping every two of the plates treated in the step 2) and placing the plates into a bidirectional compression device for clamping, wherein the gap is upward, and the pressing amount of a pressing head is set to be 5 mm;
4) And taking out the plate after the compression is finished, measuring that the average side length of the plate is reduced by 1.5mm, and the equivalent average strain is 5%, and then annealing for 0.5h at the temperature of 350 ℃ to eliminate the internal residual stress.
Example two, in order to verify the formability of the sheet, a cupping test was performed, which included the following steps:
1) selecting an uncompressed plate as a control group, annealing the uncompressed plate for 0.5h at the temperature of 350 ℃,
2) The plate obtained by the two-way compression in the first example was selected as the test group,
3) The test group and the control group of the plate are respectively subjected to a cupping test, the loading rate is 3mm/min, and the diameter of a pressure head is 20 mm.
referring to fig. 6, the cupping value of the control group is 2.1mm, the cupping value of the test group is 6.4mm, and the stamping forming performance of the AZ31 sheet material is effectively improved by the surface through bidirectional compression.
Referring to fig. 1 to 3, the method and apparatus for improving sheet forming performance by bidirectional compression are shown, and comprise a base 1, a first transition block 2, a clamping mechanism, a second transition block 4, a loading block 7 and a press head 3. The first transition block 2 and the second transition block 4 are arranged oppositely, and the opposite side surfaces are respectively provided with a first right-angle groove 22 and a second right-angle groove 42. The upper surface of the base 1 is provided with a first tooth-shaped groove 11, the cross section of the first tooth-shaped groove is arc-shaped, and the lower part of the first transition block 2 is provided with a first sector gear 21 meshed with the first tooth-shaped groove 11; the lower surface of the pressure head 3 is provided with a second toothed groove 31, the cross section of the second toothed groove 31 is arc-shaped, the upper part of the second transition block 4 is provided with a second sector gear 42 meshed with the second toothed groove 31, and the first transition block 2 and the second transition block 4 are respectively meshed with the upper surface of the base 1 and the lower surface of the pressure head 3 through toothed structures to form a rotary connection relation.
The clamping mechanism is positioned between the first transition block 2 and the second transition block 4 and comprises two rectangular clamping plates 5 which are oppositely arranged in front and back. Two adjacent sides that splint 5 is close to first transition piece 2 are laminated with first right angle groove 22 respectively, and are connected through right angle connecting block 6, right angle connecting block 6 opening is towards second right angle groove 42. The loading blocks 7 are two in number, are arranged between the clamping plates 5, are respectively positioned on two adjacent sides of the clamping plates 5 far away from the right-angle connecting block 6, have the same trend with the adjacent sides of the clamping plates 5, protrude out of the clamping mechanism, and have protruding side walls which are respectively attached to the second right-angle grooves 42. The right angle connecting block 6, splint 5 surround and enclose the cavity that is used for placing panel 8, and when panel 8 was arranged in the cavity, the side was laminated with right angle connecting block 6 and loading block 7 respectively, and preceding, trailing flank and splint 5 were laminated.
The corner of the clamping plate 5 attached to the first right-angle groove 22, the corner of the clamping plate 5 matched with the loading block 7 and the corner of the right-angle connecting block 6 far away from the plate 8 are in smooth transition through circular arcs. The circular arc transition makes clamping mechanism and first transition piece 2 and the contact of second transition piece 4 more level and smooth, causes the damage to first transition piece 2 and second transition piece 4 because of right angle corner when avoiding compressing, has increased the life of first transition piece 2 and second transition piece 4.
the outer corners of the first right-angle groove 22 and the second right-angle groove 42 are smoothly transited through circular arcs.
In another embodiment of the present invention, the right-angle connecting block 6 and the rear clamping plate 5 are integrated, and the front clamping plate is connected with the rear clamping plate by bolts. The structural strength of the clamping mechanism can be obviously improved, and the stability of plate compression is improved.
when the device works specifically, a rectangular plate 8 is placed in a clamping mechanism to be clamped, a gap is upward, the left lower side and the right lower side of the plate 8 are attached to two right-angled inclined surfaces of a right-angled connecting block 6, the left upper side and the right upper side of the plate 8 are respectively attached to a loading block 7, the clamping mechanism is integrally arranged in a first right-angled groove 22 of a first transition block 2, the first transition block 2, a second transition block 2 and the clamping mechanism are rotationally adjusted through the matching of a first tooth-shaped groove 11 and a first sector gear 21, so that a longitudinal diagonal line and a horizontal plane of the plate 8 form a certain included angle, the adjustment of different bidirectional loading proportions of the plate is realized, the loading proportions are related to the inclination angles of the longitudinal diagonal line, the second transition block 4 is rotationally adjusted, then a driving head 3 is driven by a driving motor to move downwards, two right-angled inclined surfaces 42 of the second transition block 4 are respectively attached, and bidirectional synchronous loading of the plate 8 is realized.
Referring to fig. 2, 4 and 5, three sheets of different loading ratios are shown in two-way compression, the longitudinal diagonal of the sheet of fig. 2 is perpendicular to the horizontal, and the loading ratio is 1: the diagonal of the sheets of fig. 1, 4 and 5 is inclined to the horizontal, with a loading ratio of 1: 2 and 1: the shape of the plate after compression is shown by a dotted line in the figure, and the shape of the plate after compression is different according to the loading ratio.
Claims (3)
1. the utility model provides a two-way compression improves device of panel formability which characterized in that: is used for preparing magnesium alloy to improve the forming performance of the magnesium alloy and comprises a base (1), a first transition block (2), a clamping mechanism, a second transition block (4), a loading block (7) and a pressure head (3),
The first transition block (2) and the second transition block (4) are arranged oppositely, and the opposite side surfaces are respectively provided with a first right-angle groove (22) and a second right-angle groove (42); the first transition block and the second transition block are respectively meshed with the upper surface of the base (1) and the lower surface of the pressure head (3) through tooth-shaped structures to form a rotary connection relationship;
The clamping mechanism is positioned between the first transition block (2) and the second transition block (4) and comprises two rectangular clamping plates (5) which are oppositely arranged in front and back; two adjacent edges of the clamping plate close to the first transition block are respectively attached to the first right-angle groove (22) and are connected through a right-angle connecting block (6), and the opening of the right-angle connecting block faces to the second right-angle groove (42);
the number of the loading blocks (7) is two, the loading blocks are arranged between the clamping plates (5), are respectively positioned on two adjacent sides of the clamping plates, which are far away from the right-angle connecting block (6), have the same trend with the adjacent sides of the clamping plates, protrude out of the clamping mechanism, and the protruding side walls of the loading blocks are respectively attached to the second right-angle grooves (42);
The right-angle connecting block (6) and the clamping plate (5) surround a cavity for placing the plate (8), when the plate is placed in the cavity, the side edges are respectively attached to the right-angle connecting block and the loading block, and the front side surface and the rear side surface are attached to the clamping plate;
The upper surface of the base (1) is provided with a first tooth-shaped groove (11), the cross section of the first tooth-shaped groove is arc-shaped, and the lower part of the first transition block (2) is provided with a first sector gear (21) meshed with the first tooth-shaped groove;
The lower surface of the pressure head (3) is provided with a second toothed groove (31), the cross section of the second toothed groove is arc-shaped, and the upper part of the second transition block (4) is provided with a second sector gear (41) meshed with the second toothed groove;
the right-angle connecting block (6) and the clamping plate (5) at the rear part are of an integral structure.
2. The apparatus for improving sheet forming performance by bi-directional compression as claimed in claim 1, wherein: the corner of the clamping plate (5) attached to the first right-angle groove (22), the corner of the clamping plate matched with the loading block (7) and the corner of the right-angle connecting block (6) far away from the plate (8) are in smooth transition through circular arcs.
3. The apparatus for improving sheet forming performance by bi-directional compression as claimed in claim 2, wherein: the outer corners of the first right-angle groove (22) and the second right-angle groove (42) are in smooth transition through circular arcs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048902.0A CN108265248B (en) | 2018-01-18 | 2018-01-18 | Method and device for improving sheet forming performance through bidirectional compression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048902.0A CN108265248B (en) | 2018-01-18 | 2018-01-18 | Method and device for improving sheet forming performance through bidirectional compression |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108265248A CN108265248A (en) | 2018-07-10 |
| CN108265248B true CN108265248B (en) | 2019-12-13 |
Family
ID=62776019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810048902.0A Active CN108265248B (en) | 2018-01-18 | 2018-01-18 | Method and device for improving sheet forming performance through bidirectional compression |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108265248B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738279B (en) * | 2019-01-28 | 2021-12-03 | 东北大学 | Multi-angle rock shearing experiment clamp |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039881B (en) * | 2015-07-21 | 2018-01-05 | 重庆大学 | A kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation |
-
2018
- 2018-01-18 CN CN201810048902.0A patent/CN108265248B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108265248A (en) | 2018-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108265248B (en) | Method and device for improving sheet forming performance through bidirectional compression | |
| CN106513512A (en) | One-time forming mould for safe case sideboard and using and machining methods thereof | |
| CN111940638A (en) | Adjustable general component lead batch forming tool and forming method | |
| CN105195549A (en) | Process capable of obviously improving room-temperature forming property of AZ31 magnesium alloy plate | |
| CN211539225U (en) | Stamping die of refrigerator sheet metal part | |
| CN112620384A (en) | Method and device for thickening magnesium alloy plate at room temperature | |
| CN218310276U (en) | Die positioning device for stably positioning stamping die | |
| CN110802163A (en) | Ultrasonic-assisted batch creep aging forming device for wall plates and using method | |
| CN114589260B (en) | Stamping forming equipment for metal plate processing | |
| CN210450382U (en) | Stamping equipment with stable stamping | |
| CN206632230U (en) | A kind of Hardware fitting for diel | |
| CN210649243U (en) | Clamp device for welding sheet metal parts | |
| CN213671232U (en) | Be applied to hold-down mechanism that metal sheet bent | |
| CN219211183U (en) | Right-angle bending sheet metal part machining device | |
| CN217334195U (en) | Hot pressing fixture formation device | |
| CN211840014U (en) | Full-automatic riveting press | |
| CN209896875U (en) | Slender motor iron core laminating device | |
| CN220041586U (en) | Press machine with clamping tool | |
| CN113857894B (en) | Milling machine fixture used for machine tool and capable of adjusting height of gasket and facilitating locking of workpiece | |
| CN221755409U (en) | High adaptability stainless steel wire rod or round bar processing auxiliary device | |
| CN221339832U (en) | Pressure maintaining tool for cold press | |
| CN220661807U (en) | Timing preheating plate hot press device | |
| CN211437733U (en) | Sliding rail punch forming equipment | |
| CN221336322U (en) | Stamping device that titanium alloy material processing was used | |
| CN221435095U (en) | Aluminum plate grooving machine with anti-offset function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |