CN103691814A - Special lower mold for bending computer chassis and machining method of face mold - Google Patents
Special lower mold for bending computer chassis and machining method of face mold Download PDFInfo
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- CN103691814A CN103691814A CN201310673147.2A CN201310673147A CN103691814A CN 103691814 A CN103691814 A CN 103691814A CN 201310673147 A CN201310673147 A CN 201310673147A CN 103691814 A CN103691814 A CN 103691814A
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Abstract
The invention discloses a special lower mold for bending a computer chassis and a machining method of a face mold, which belongs to the field of the mold design. The special lower mold comprises lower mold shells and a lower mold body, and also comprises a first face mold and a second face mold, and the upper surface of the lower mold body is provided with a downward groove; the quantity of the lower mold shells is two, and the two lower mold shells are respectively arranged on two ends of the lower mold body; the lower mold shell is provided with two bearings in the axial direction; the first face mold is parallel to the second face mold; the shape of the first face mold is symmetric to that of the second face mold; when the special lower mold is used for bending the computer chassis, the computer chassis can be bent through the cooperative overturning of the first face mold and the second face mold, the contact of a workpiece and the lower mold is changed from the linear contact of the traditional mold to the existing face contact, so that the surface of the workpiece is not damaged; the computer chassis can be bent in one step, the crease line is a straight line, the precision is high, convenience in operation is realized, and the cost is low; the face mold is good in rigidness, high in strength and good in planeness and unlikely to deform.
Description
Technical field
The invention belongs to Design of Dies field, specifically, relate to a kind of bending machine die, more particularly, relate to a kind of special-purpose bed die of computer housing bending and the processing method of face mould thereof.
Background technology
Bending machine die is that bender is used for the instrument of machine-shaping plate, and this instrument consists of various parts, and the part that different moulds forms is different.It mainly realizes the processing of article profile by the change of institute's moulding material physical state.Under the effect of bender pressure, by leading each other of upper die of bending machine and counterdie, blank is become and have the workpiece of given shape and size.In actual production process, enterprise can, according to the difference of shaping workpiece shape or size, configure the counterdie of different groove angles.But along with expanding economy, the shape of the workpiece of the bending of wanting is also more and more diversified, different like this workpiece just needs special mould to process, for example, in man-hour that adds of computer housing, require comparatively strict, especially requiring can not have damage to sheet material, and bending part should be absolute straight line, and general bender all can have damage by sheet material.When existing bender carries out bending, be all by mould, to offer " V " type groove or " U " type groove or other shapes to complete bending, when bending operation, sheet material is that line contacts with mould like this, must cause the damage of sheet material.
For example: China Patent No.: 201110389823.4 applyings date: on November 30th, 2011, the patent application document that a name is called a kind of Bending Mould is disclosed, it comprises the V-shaped punch for machining sheet, with the die with punch adaptation, the contact both sides face of described die is the curved surface that makes to form between described sheet material and die non-sliding friction in process, and the contact both sides face of described die is involute shape curved surface.This beneficial effect of the invention is: improved traditional V-type Bending Mould, can tackle the bending and forming of the sheet material of multi-thickness and flanging width.Improve the production efficiency of bending and forming, reduced the work working strength of frequent replacing Bending Mould.Meanwhile, due to the minimizing of the supporting Bending Mould specification of bender, also further compressed purchasing and maintenance cost of equipment.
For example: China Patent No.: 201110304207.4, the applying date: on October 10th, 2011, disclose a name and be called a kind of bend punching die, related to the diel used of a kind of machining.It comprises upper bolster, train wheel bridge, lower bolster, die shoe, described upper bolster is connected with train wheel bridge, described lower bolster is connected with die shoe, described lower bolster is provided with groove, described train wheel bridge is provided with Bending punch, and described Bending punch is provided with the V-arrangement punching press end matching with lower bolster groove.The above Bending punch top is provided with screw.Its beneficial effect is, adopts after this invention technical scheme, and the punch pin with V-shaped hose of Bending punch and the groove fit of lower bolster, a punching press realizes the bending of parts, and parts bending camber is consistent.
But these only complete bending by " V " the type groove by offering on bed die or " U " type groove or other shapes, although this cost is lower, but cannot meet the requirement of modern crafts to precision, especially electronic product, requirement for profile is more and more higher, and common bending machine mould sheet material when bending operation is that line contacts with mould, must cause the damage of sheet material, and bending part, effect due to power, can there is a point deformation in mould itself, especially the middle of mould can be slightly sagging (or protruding, concrete condition is to sink or projection will act on mold or bed die is determined according to the active force of bender), this bending part that just causes the workpiece of institute's bending is not an absolute straight line, have slight bending, this can not meet the production requirement of modern crafts completely, especially cannot meet the bending requirement of high-end computer housing.
For this reason, the present invention has designed a kind of special-purpose bed die of computer housing bending, original bending machine die can be become to face contact in the line contact of bending part, to workpiece not damaged, the computer housing not damaged of processing, and institute's bending part is a straight line, and machining accuracy is high.And middle part---the face mould that relates to a core of this mould, face mould is higher to hardness requirement, and require good springiness, can not damage workpiece, especially after Quenching Treatment, workpiece can not have distortion, surface is smooth, and existing material and heat treatment do not reach this requirement completely, so face mould is badly in need of a kind of new material and processing technology.
Summary of the invention
1. the technical problem that invention will solve
For existing bending machine die, must cause the damage of sheet material when the bending operation, and bending part has slight bending, cannot meet the problem of the production requirement of modern crafts, a kind of special-purpose bed die of computer housing bending and the processing method of face mould thereof are provided, it can not produce damage on the one hand when processing computing cabinet carries out bending to workpiece, also has on the other hand bending part without crooked effect; Simultaneously in order to make the effect performance of this mould best, the present invention also provides the processing method of the face mould that a kind of this mould uses, and can make the face mould of this mould have good hardness, high strength and flatness, not yielding.
2. technical scheme
Object of the present invention is achieved through the following technical solutions.
A kind of special-purpose bed die of computer housing bending, comprise bed die shell and bed die body, also comprise the first face mould and the second face mould, the upper surface of described bed die body has groove downwards, this groove is along the axial directional distribution of bed die body, in this groove, have two face mould grooves, face mould groove be shaped as half round post, parallel to each other between two face mould grooves; The centre position, bottom of described bed die body is in axial direction provided with the second end groove of a cuboid; Described bed die shell has two, lays respectively at the two ends of bed die body; The axial direction of described bed die shell is provided with two bearings, and the place, centre position, bottom of bed die shell is provided with first end groove in axial direction; The first described end groove is corresponding with shape and the position of the second end groove; Described the first face mould and the second face mould be arranged in parallel; The first described face mould and the shape of the second face mould are symmetrical; The first described face mould and the two ends of the second face mould are all respectively equipped with an axle, and middle part is all provided with first groove; Two ends in the first described groove are equipped with the second groove; The axle at the first described face mould and the two ends of the second face mould inserts in the bearing on bed die shell; On the sidewall of described bed die shell, be also provided with screw hole, bed die shell be fixed on bed die body after passing screw hole by screw; The first described face mould and the width of the second face mould are less than or equal to the diameter of face mould groove.
Preferably, the screw hole on described bed die shell has four.
Preferably, between two the second grooves in the first described groove, be a platform, on this platform, be also provided with a rollet.
Although the special-purpose bed die of this computer housing bending can complete the bending to workpiece fast, not damaged, but the first face mould wherein and the second face mould require to have higher hardness, indeformable, especially can not be as common die, when mold presses down workpiece, because bed die is longer, bed die there will be centre position slightly than the low such curve condition in two ends.And if there is high rigidity, high strength, can avoid bending part to occur curve condition, also to avoid bed die to deform in heat treatment and use procedure simultaneously, guarantee that face mould surface is plane, especially after repeatedly using, also will guarantee that face mould is indeformable, this will rely on rational material composition and Technology for Heating Processing, so will find a kind of new material and Technology for Heating Processing for face mould.
In the special-purpose bed die of computer housing bending, a processing method for face mould, the steps include:
(1) raw material of blank are prepared
Face mould adopts rough forging to make, and the component of this rough forging and mass percent are: C:0.41～0.45%, Mn:0.73～0.76%, Si:0.24～0.27%, S :≤0.020%, P :≤0.025%, Cr:1.93～1.97%, Mo:0.85～0.95, Sc
2o
3: 0.03～0.05%, surplus is Fe;
(2) annealing in process of rough forging:
The annealed stove of rough forging obtaining in step (1) is annealed to it, and its annealing temperature is 830-860 ℃, and annealing time is 4～6 h, is chilled to 320-450 ℃ of laggard line space cold in annealing furnace;
(3) preliminary working of rough forging, is processed into the primary shape of the first face mould and the second face mould, and each face retains the surplus of 1mm;
The heat treatment of (4) first face moulds and the second face mould:
By the first face mould through step Vehicle Processing and the second face mould, after being first heated to 600-670 ℃, be incubated 1-2 h, and then be heated to 810-850 ℃ of insulation 20-30 min, then be heated to 860-890 ℃, after insulation 0.5-1h, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-215 to-223 ℃ again, keeps 1-2h, then at the temperature of 340-450 ℃, carry out tempering, twice of tempering;
The deep processing of (5) first face moulds and the second face mould:
Will be through heat treated the first face mould of step (4) and the second face mould, further deep processing, the steps include:
A removes surface oxide layer with water under high pressure;
B machining shaft;
C on lathe, carries out finish turning by the first face mould and the second face mould clamping; Some computer housing is adding the special decorative pattern of man-hour requirement, so these decorative patterns are symmetrical mutually in the shape of the first face mould and the second face mould, finish turning need to be distinguished in the first face mould position different with the second face mould during finish turning like this;
D refines the first face mould and the second face mould;
Whether qualified the detection of (6) first face moulds and the second face mould, detect size.
Preferably, in described step (1), component and the mass percent of rough forging is: C:0.43%, Mn:0.75%, Si:0.26%, S :≤0.020%, P :≤0.025%, Cr:1.95%, Mo:0.90%, Sc
2o
3: 0.04%, surplus is Fe;
Preferably, in the annealing in process of described step (2) rough forging, annealing temperature is 840 ℃, and annealing time is 5 h, is chilled to 400 ℃ of laggard line spaces cold in annealing furnace.
Preferably, heat treatment in described step (4) is to be incubated 1 h after being first heated to 640 ℃, and then be heated to 830 ℃ of insulation 25 min, then be heated to 880 ℃, after insulation 45 min, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-220 ℃ again, keeps 1.5 h, then at the temperature of 390 ℃, carry out tempering, twice of tempering.
Preferably, in described step (4), the hardening media of oil quenching is conventional quenching oil.
3. beneficial effect
Compared with prior art, the present invention has following remarkable advantage:
(1) device of the present invention also comprises the first face mould and the second face mould, when bending, be to overturn bending by the cooperation of the first face mould and the second face mould like this, workpiece becomes present face with contacting of bed die from the line contact of old-fashioned mould and contacts, to surface of the work not damaged; This device can the disposable bending completing computer housing, and folding line is straight line, and precision is high, easy to operate, and cost is low;
(2) face mould that in the special-purpose bed die of computer housing bending of the present invention, the processing method of face mould is processed has good hardness, high strength and flatness, not yielding;
(3) apparatus structure of the present invention is simple, easy to operate, and processing cost is low, long service life, simultaneously due to when the processing work to workpiece not damaged, the life-span of the workpiece of processing is also long;
(4) in the special-purpose bed die of computer housing bending of the present invention the processing method of face mould by new material and Technology for Heating Processing, guarantee that processed face mould can avoid bed die to deform in heat treatment and use procedure, guarantee that face mould surface is plane, especially after repeatedly using, also can guarantee that face mould is indeformable, avoid bed die to there will be centre position slightly than the low such curve condition in two ends.
Accompanying drawing explanation
Fig. 1 is the front view of apparatus of the present invention;
Fig. 2 is the top view of apparatus of the present invention;
Fig. 3 is that apparatus of the present invention the first face mould and the second face mould are with respect to the top view at Fig. 1 visual angle;
Fig. 4 is that apparatus of the present invention the first face mould is with respect to the front view at Fig. 1 visual angle;
Fig. 5 is that apparatus of the present invention bed die shell is with respect to the left view at Fig. 1 visual angle;
Fig. 6 is that apparatus of the present invention bed die body is with respect to the left view at Fig. 1 visual angle.
In figure: 1, bed die shell; 11, bearing; 12, screw hole; 13, the first end groove; 2, bed die body; 21, face mould groove; 22, the second end groove; 3, the first face mould; 31, axle; 32 first grooves; 33, the second groove; 4, the second face mould.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
embodiment 1
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a kind of special-purpose bed die of computer housing bending, comprise bed die shell 1 and bed die body 2, also comprise the first face mould 3 and the second face mould 4, the upper surface of bed die body 2 has groove downwards, and this groove, along the axial directional distribution of bed die body 2, has two face mould grooves 21 in this groove, face mould groove 21 be shaped as half round post, parallel to each other between two face mould grooves 21; The centre position, bottom of bed die body 2 is in axial direction provided with the second end groove 22 of a cuboid; Bed die shell 1 has two, lays respectively at the two ends of bed die body 2; The axial direction of bed die shell 1 is provided with two bearings 11, and the place, centre position, bottom of bed die shell 1 is provided with first end groove 13 in axial direction; The first end groove 13 is corresponding with shape and the position of the second end groove 22; The first face mould 3 and the second face mould 4 be arranged in parallel; The shape of the first face mould 3 and the second face mould 4 is symmetrical; The two ends of the first face mould 3 and the second face mould 4 are all respectively equipped with an axle 31, and middle part is all provided with first groove 32; Two ends in the first groove 32 are equipped with the second groove 33; In the bearing 11 that the axle 31 at the two ends of the first face mould 3 and the second face mould 4 inserts on bed die shell 1; On the sidewall of bed die shell 1, be also provided with screw hole 12, bed die shell 1 be fixed on bed die body 2 after passing screw hole 12 by screw; The width of the first face mould 3 and the second face mould 4 is less than or equal to the diameter of face mould groove 21.Screw hole 12 on bed die shell 1 has four.Between two the second grooves 33 in the first groove 32, be a platform, on this platform, be also provided with a rollet.
During device busy of the present invention, first be that workpiece is lain on the first face mould 3 and the second face mould 4, then mold presses down from the position between the first face mould 3 and the second face mould 4, the axle 31 that now the first face mould 3 and the second face mould 4 all be take separately as axle center along with pressing down of mold rotates, when folding to desired angle, mold stops pressing down, this whole pressing down in process, the surface of the first face mould 3 and the second face mould 4 contacts with the face of workpiece folding line both sides all the time, guarantee that between workpiece and the first face mould 3 and the second face mould 4, maintenance face contacts, avoid the damage of workpiece.
The processing method of this device, is first to forge, and then is finish-machined to the shape of all parts, finally assembling.Wherein, due to the first face mould 3 and higher hardness, intensity and the indeformable characteristic of the second face mould 4 needs, need to carry out specially treated.
In the special-purpose bed die of computer housing bending, a processing method for face mould, the steps include:
(1) raw material of blank are prepared
Face mould adopts rough forging to make, and the component of this rough forging and mass percent are: C:0.43%, Mn:0.75%, Si:0.26%, S :≤0.020%, P :≤0.025%, Cr:1.95%, Mo:0.90%, Sc
2o
3: 0.04%, surplus is Fe;
(2) annealing in process of rough forging:
The annealed stove of rough forging obtaining in step (1) is annealed to it, and its annealing temperature is 840 ℃, and annealing time is 5 h, is chilled to 400 ℃ of laggard line spaces cold in annealing furnace;
(3) preliminary working of rough forging, is processed into the primary shape of the first face mould 3 and the second face mould 4, and each face retains the surplus of 1mm;
The heat treatment of (4) first face moulds 3 and the second face mould 4:
Will be through the first face mould 3 and second face mould 4 of step (3) Vehicle Processing, after being first heated to 640 ℃, be incubated 1 h, and then be heated to 830 ℃ of insulation 25 min, then be heated to 880 ℃, after insulation 45 min, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-220 ℃ again, keeps 1.5 h, then at the temperature of 390 ℃, carry out tempering, twice of tempering;
The deep processing of (5) first face moulds 3 and the second face mould 4:
Will be through heat treated the first face mould 3 of step (4) and the second face mould 4, further deep processing, the steps include:
A removes surface oxide layer with water under high pressure;
C on lathe, carries out finish turning by the first face mould 3 and the second face mould 4 clampings;
D refines the first face mould 3 and the second face mould 4;
Whether qualified the detection of (6) first face moulds 3 and the second face mould 4, detect size.
The hardness that obtains face mould is HRC60, through magnetic powder inspection flawless.Use the face mould after 20,000 2 thousand times still normally to use.Distance in face mould between two the second grooves is 420 mm, and the sheet material that is 400 mm to width carries out bending, and bending detects by level meter, and folding line is straight line, and folding line is even, attractive in appearance, and after bending, the side of sheet material is not damaged.
With embodiment 1, difference is that component and the mass percent of rough forging is: C:0.41%, Mn:0.76%, Si:0.24%, S :≤0.020%, P :≤0.025%, Cr:1.97%, Mo:0.85, Sc
2o
3: 0.05%, surplus is Fe; In step (2), annealing temperature is 830 ℃, and annealing time is 6 h, is chilled to 320 ℃ of laggard line spaces cold in annealing furnace; The heat treatment of the first face mould 3 and the second face mould 4 in step (4), to be incubated 1.5h after being first heated to 670 ℃, and then be heated to 850 ℃ of insulation 20 min, then be heated to 890 ℃, after insulation 0.5h, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-223 ℃ again, keeps 1 h, then at the temperature of 450 ℃, carry out tempering, twice of tempering.The hardness of the face mould obtaining is HRC59, through magnetic powder inspection flawless.Use the face mould after 20,000 times still normally to use.
With embodiment 1, difference is that component and the mass percent of rough forging is: C:0.45%, Mn:0.73%, Si:0.27%, S :≤0.020%, P :≤0.025%, Cr:1.93%, Mo:0.95, Sc
2o
3: 0.03%, surplus is Fe; In step (2), annealing temperature is 860 ℃, and annealing time is 4 h, is chilled to 450 ℃ of laggard line spaces cold in annealing furnace; The heat treatment of the first face mould 3 and the second face mould 4 in step (4), to be incubated 2 h after being first heated to 600 ℃, and then be heated to 810 ℃ of insulation 30 min, then be heated to 860 ℃, after insulation 1h, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-215 ℃ again, keeps 2 h, then at the temperature of 340 ℃, carry out tempering, twice of tempering.The hardness of the face mould obtaining is HRC58, through magnetic powder inspection flawless.Use the face mould after 20,000 1 thousand times still normally to use.
Claims (8)
1. the special-purpose bed die of a computer housing bending, comprise bed die shell (1) and bed die body (2), it is characterized in that: also comprise the first face mould (3) and the second face mould (4), the upper surface of described bed die body (2) has groove downwards, this groove is along the axial directional distribution of bed die body (2), in this groove, have two face mould grooves (21), face mould groove (21) be shaped as half round post, parallel to each other between two face mould grooves (21); The centre position, bottom of described bed die body (2) is in axial direction provided with the second end groove (22) of a cuboid; Described bed die shell (1) has two, lays respectively at the two ends of bed die body (2); The axial direction of described bed die shell (1) is provided with two bearings (11), and the place, centre position, bottom of bed die shell (1) is provided with first end groove (13) in axial direction; The first described end groove (13) is corresponding with shape and the position of the second end groove (22); Described the first face mould (3) and the second face mould (4) be arranged in parallel; Described the first face mould (3) and the shape of the second face mould (4) are symmetrical; Described the first face mould (3) and the two ends of the second face mould (4) are all respectively equipped with an axle (31), and middle part is all provided with first groove (32); Two ends in described the first groove (32) are equipped with the second groove (33); The axle (31) at described the first face mould (3) and the two ends of the second face mould (4) inserts in the bearing (11) on bed die shell (1); On the sidewall of described bed die shell (1), be also provided with screw hole (12), bed die shell (1) be fixed on bed die body (2) after passing screw hole (12) by screw; Described the first face mould (3) and the width of the second face mould (4) are less than or equal to the diameter of face mould groove (21).
2. the special-purpose bed die of a kind of computer housing bending according to claim 1, is characterized in that, the screw hole (12) on described bed die shell (1) has four.
3. the special-purpose bed die of a kind of computer housing bending according to claim 1, is characterized in that, between two the second grooves (33) in described the first groove (32), is a platform, is also provided with a rollet on this platform.
4. a processing method for face mould in the special-purpose bed die of computer housing bending, the steps include:
(1) raw material of blank are prepared
Face mould adopts rough forging to make, and the component of this rough forging and mass percent are: C:0.41～0.45%, Mn:0.73～0.76%, Si:0.24～0.27%, S :≤0.020%, P :≤0.025%, Cr:1.93～1.97%, Mo:0.85～0.95, Sc
2o
3: 0.03～0.05%, surplus is Fe;
(2) annealing in process of rough forging:
The annealed stove of rough forging obtaining in step (1) is annealed to it, and its annealing temperature is 830-860 ℃, and annealing time is 4～6 h, is chilled to 320-450 ℃ of laggard line space cold in annealing furnace;
(3) preliminary working of rough forging, is processed into the primary shape of the first face mould (3) and the second face mould (4), and each face retains the surplus of 1mm;
The heat treatment of (4) first face moulds (3) and the second face mould (4):
Will be through the first face mould (3) and second face mould (4) of step (3) Vehicle Processing, after being first heated to 600-670 ℃, be incubated 1-2 h, and then be heated to 810-850 ℃ of insulation 20-30 min, then be heated to 860-890 ℃, after insulation 0.5-1h, quench, oil quenching, after cooling, pass through subzero treatment, the temperature of subzero treatment is-215 to-223 ℃ again, keeps 1-2h, then at the temperature of 340-450 ℃, carry out tempering, twice of tempering;
The deep processing of (5) first face moulds (3) and the second face mould (4):
Will be through heat treated the first face mould of step (4) (3) and the second face mould (4), further deep processing, the steps include:
A removes surface oxide layer with water under high pressure;
B machining shaft (31);
C on lathe, carries out finish turning by the first face mould (3) and the second face mould (4) clamping;
D refines the first face mould (3) and the second face mould (4);
Whether qualified the detection of (6) first face moulds (3) and the second face mould (4), detect size.
5. the processing method of face mould in the special-purpose bed die of a kind of computer housing bending according to claim 4, it is characterized in that, in described step (1), component and the mass percent of rough forging are: C:0.43%, Mn:0.75%, Si:0.26%, S :≤0.020%, P :≤0.025%, Cr:1.95%, Mo:0.90%, Sc
2o
3: 0.04%, surplus is Fe.
6. the processing method of face mould in the special-purpose bed die of a kind of computer housing bending according to claim 4, it is characterized in that, in the annealing in process of described step (2) rough forging, annealing temperature is 840 ℃, and annealing time is 5 h, is chilled to 400 ℃ of laggard line spaces cold in annealing furnace.
7. according to the processing method of interior card moving block in the special-purpose bed die of a kind of computer housing bending described in any one in claim 3-6, it is characterized in that, heat treatment in described step (4) is to be incubated 1 h after being first heated to 640 ℃, and then be heated to 830 ℃ insulation 25 min, be heated to again 880 ℃, after being incubated 45 min, quench, oil quenching, after cooling, pass through again subzero treatment, the temperature of subzero treatment is-220 ℃, keep 1.5 h, then at the temperature of 390 ℃, carry out tempering, twice of tempering.
8. according to the special-purpose bed die of a kind of computer housing bending described in any one in claim 3-6, it is characterized in that, in described step (4), the hardening media of oil quenching is conventional quenching oil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105057464A (en) * | 2014-04-08 | 2015-11-18 | 安徽新源精密模具有限公司 | Method for machining middle die body of bending machine die for round workpieces |
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| US2882952A (en) * | 1958-02-06 | 1959-04-21 | Carl Parten | Die for use in bending flat metal stock and the like |
| US5060501A (en) * | 1991-01-25 | 1991-10-29 | Century Manufacturing Co. Inc. | Flat metal stock bending die |
| CN1383394A (en) * | 2000-06-23 | 2002-12-04 | 老虎恒产有限公司 | Metal sheet bending device with rotation inhibiting function |
| JP2002035842A (en) * | 2000-07-31 | 2002-02-05 | Amada Denshi:Kk | Folding machine |
| CN101569907A (en) * | 2008-04-28 | 2009-11-04 | 鸿富锦精密工业（深圳）有限公司 | Bending die |
| CN201744572U (en) * | 2010-07-19 | 2011-02-16 | 宁波司普瑞茵通信技术有限公司 | Traceless bending die |
| CN203578573U (en) * | 2013-12-12 | 2014-05-07 | 安徽力源数控刃模具制造有限公司 | Special lower mold for bending computer case |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057464A (en) * | 2014-04-08 | 2015-11-18 | 安徽新源精密模具有限公司 | Method for machining middle die body of bending machine die for round workpieces |
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|---|---|
| CN103691814B (en) | 2016-02-03 |
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