CN110238309B - Double-material prevention device for automobile forming die - Google Patents

Double-material prevention device for automobile forming die Download PDF

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Publication number
CN110238309B
CN110238309B CN201910549150.0A CN201910549150A CN110238309B CN 110238309 B CN110238309 B CN 110238309B CN 201910549150 A CN201910549150 A CN 201910549150A CN 110238309 B CN110238309 B CN 110238309B
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groove
structural member
reference structural
point
die
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CN110238309A (en
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周厚保
段彦宾
王冀军
陈科
刘龙芬
李键
毛静莉
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Chengdu Push Automobile Mold Co ltd
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Chengdu Push Automobile Mold Co ltd
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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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass

Abstract

The invention relates to an anti-double-material device for an automobile forming die, and belongs to the technical field of automobile panel dies. The invention is mainly suitable for the structure of a high-strength plate or thick plate die, and key parameters (fracture widths b and f) are determined by additionally arranging a material duplicate prevention device between a wedge slide block and an insert of the die1And f2Determined relative position of breaking point and avoiding distance d on two sides1And d2) The reasonable design is made, so that the strength of the die is safe and reliable when a single plate is formed in a normal state; when two sheets of plates appear in the die cavity, the section A-A (the section between the bottom surface of the groove and the front surface of the reference structural member) of the double-material prevention device is broken before the main structure of the die fails. In the fracture process, the contact stress of the forming molded surfaces such as the mold insert, the mold seat and the like is buffered by utilizing the avoiding space in the device, so that the mold structure is not damaged, and the safety and the service life of the whole pair of molds can be ensured.

Description

Double-material prevention device for automobile forming die
Technical Field
The invention relates to an anti-double-material device for an automobile forming die, and belongs to the technical field of automobile panel dies.
Background
The design structure of any die is originally designed to form one plate, and mainly the die structure has no space in design and simultaneously forms two plates. When two sheets are formed by accident, there are two cases according to the sheet thickness and the tensile strength:
one is when two sheets are formed, for example, a sheet with the thickness of 0.6mm is formed on an outer plate, and due to the fact that one sheet is thicker, all force of the tonnage of a press acts on a second sheet, so that the elastic deformation of 0.6mm occurs on the stress part of the die, the thickness of the second sheet can be avoided, according to experience, after the elastic deformation of 0.6mm occurs on the die structure, the die can be recovered to be normal after the pressure of the press is removed, and the structure is not damaged.
The other is a forming high-strength plate or thick plate type die structure, for example, when a middle-high-strength plate with a forming thickness of 1.2mm is formed, because the yield strength of the middle-high-strength plate is high, when all the tonnage of a press is applied to the die structure under the second sheet material, the die structure can hardly recover the original shape after elastic deformation of more than 1.2mm is generated according to the actual working condition, and most of the time, the forming fracture occurs at the stress concentration part of the die.
On the probability and the damage degree of grabbing the double materials, the phenomenon of grabbing the double materials is particularly serious when an automatic feeding device is adopted to grab blanks due to the fact that high-strength plates in an automobile die are beam-shaped, and the double material grabbing sensor can avoid the phenomenon to a certain extent, but is poor in using effect sometimes in certain structures or production lines, and cannot guarantee 100% of double material recognition rate. According to the conventional quality accident, when double materials appear, because the clearance of the die surface is small, when the thickness of one plate is increased, the stress of a die insert or a die holder is sharply increased during forming, the die holder or the insert is broken, on one hand, the economic loss of the die is caused, and on the other hand, the production of an automatic stamping production line is stopped for more than one month.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the double-material prevention device for the automobile forming die is suitable for a high-strength plate or thick plate die structure, and can ensure the safety of the whole pair of dies when two plates appear in a die cavity.
In order to solve the technical problems, the invention adopts the technical scheme that: the double-material prevention device for the automobile forming die comprises a reference structural part, wherein the top surface and the bottom surface of the reference structural part are both flat and parallel to each other, and the height of the reference structural part is marked as h; the front surface and the back surface of the reference structural member are both planes and are parallel to each other; the middle part of the back of the reference structural member is provided with a groove, and the bottom surface of the groove is parallel to the reference structurePlane of the back of the piece, depth of the groove being marked d1The groove penetrates through the upper end and the lower end of the reference structural member, the width of the bottom surface of the groove is marked as a, and the width of the bottom surface of the groove is the same along the length direction of the groove; a rectangular bump is arranged in the middle of the front face of the reference structural member, the top face of the bump is a plane parallel to the front face of the reference structural member, and the height mark of the bump is d2Two end faces in the length direction of the bump are superposed with the upper end face and the lower end face of the reference structural member; the thickness of the plate to be formed is set as t, d1≥2t,d2≥2t。
On the same transverse section of the reference structural member, two end points of the bottom surface of the groove in the width direction of the groove are marked as u and p respectively, and two end points of the bottom end of the bump in the width direction of the bump are marked as v and q respectively; point u and point v are located on the same side, and point p and point q are located on the same side; the projection point of the point v on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point u, and the distance between the projection point of the point v on the bottom surface of the groove and the point u is set to be f1，5mm≤f1Less than or equal to 10 mm; the projection point of the point q on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point p, and the distance between the projection point of the point q on the bottom surface of the groove and the point p is set to be f2；5mm≤f2≤10mm。
The back surface of the reference structural member is set as a tapered wedge sliding block contact surface, and the top surface of the bump is set as an insert contact surface; the distance between the bottom surface of the groove and the front surface of the reference structural member is the width of a fracture section, and is marked as b; the fracture section width b satisfies the following condition:
Figure BDA0002104904970000021
wherein σShould be takenThe contact stress of the contact surface of the insert during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the reference structural member material; a is the width of the bottom surface of the groove; k is a radical of1And k2Are all constants, k1The value of k is 1.1-1.32The value is 0.7-0.9.
Further, the method comprises the following steps: sigmaShould be takenIs determined according to the following steps: first, the formula F is 1.15 × σ × t × (L +. sigma.l)iX cos theta) calculation moldingForce F, where σ is the tensile strength of the sheet to be formed, t is the thickness of the sheet to be formed, L is the contour perimeter of the forming area, LiThe length of the ridge characteristic in the forming area and theta are the section inclination angle formed by the stamping direction and the ridge; then adopting finite element software to calculate sigma by applying forming force FShould be taken。
Further, the method comprises the following steps: d1＝d2。
Further, the method comprises the following steps: f. of1＝f2。
Further, the method comprises the following steps: k is a radical of1The value is 1.2, k2The value is 0.8.
Further, the method comprises the following steps: the top surface fixedly connected with connecting plate of benchmark structure spare, the other end of connecting plate is for the setting of overhanging of benchmark structure spare back one side towards the benchmark structure spare to be provided with the bolt connection hole at the position of overhanging.
Further, the method comprises the following steps: the connecting plate is arranged at the position where the outer end face of the groove is intersected with the top face of the reference structural member; the connecting plates are two and are symmetrically arranged by taking the center line of the width direction of the groove as an axis.
Further, the method comprises the following steps: the reference structural part is fixedly arranged on the wedge sliding block, the contact surface of the wedge sliding block is in contact with the wedge sliding block, and the contact surface of the insert is in contact with the insert.
Further, the method comprises the following steps: the reference structural members are arranged in parallel.
The invention has the beneficial effects that: by additionally arranging a double-material prevention device between a wedge slide block and an insert of the die and adjusting key parameters (fracture width b, f)1And f2Determined relative position of breaking point and avoiding distance d on two sides1And d2) The reasonable design is made, so that the strength of the die is safe and reliable when a single plate is formed in a normal state; when two sheets of plates appear in the die cavity, the section A-A (the section between the bottom surface of the groove and the front surface of the reference structural member) of the double-material prevention device is broken before the main structure of the die fails. In the breaking process, the contact stress of the forming molded surfaces of the insert, the die holder and the like is buffered by utilizing the avoiding space in the device, so that the die structureThe structure is not damaged, and the safety and the service life of the whole pair of dies can be ensured.
Drawings
FIG. 1 is a two-dimensional view of an anti-double material device of the present invention;
FIG. 2 is a schematic view of the force analysis of the double-material prevention device according to the present invention;
FIG. 3 is a schematic structural view of a sheet forming area in an embodiment of the present invention;
FIG. 4a is a schematic structural diagram of a first installation embodiment of the double feed prevention device in the invention;
FIG. 4b is a schematic structural diagram of a second installation embodiment of the double feed prevention device of the present invention;
FIG. 5 is a three-dimensional view of the double feed prevention device;
the labels in the figure are: 1-a reference structural part, 2-a tapered wedge slide block contact surface, 3-an insert contact surface, 4-a connecting plate, 5-a bolt connecting hole, 6-a tapered wedge slide block, 7-an insert, 8-a bolt and 9-a lower male die.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
As shown in fig. 1, 2 and 5, the present invention includes a reference structural member 1, wherein the top surface and the bottom surface of the reference structural member 1 are both planar and parallel to each other, and the height of the reference structural member 1 is marked as h; the front and back of the reference structural member 1 are both flat and parallel to each other; a groove is arranged in the middle of the back of the reference structural member 1, the bottom surface of the groove is a plane parallel to the back of the reference structural member 1, and the depth of the groove is marked as d1The groove penetrates through the upper end and the lower end of the reference structural member 1, the width of the bottom surface of the groove is marked as a, and the width of the bottom surface of the groove is the same along the length direction of the groove; a rectangular bump is arranged in the middle of the front face of the reference structural member 1, the top face of the bump is a plane parallel to the front face of the reference structural member 1, and the height mark of the bump is d2Two end surfaces in the length direction of the bump are superposed with the upper end surface and the lower end surface of the reference structural member 1; the thickness of the plate to be formed is set as t, d1≥2t,d2≥2t。
On the same transverse cross-section of the reference structure 1, the bottom surface of the grooveThe two end points of the bottom end of the lug in the width direction of the lug are marked as v and q respectively; point u and point v are located on the same side, and point p and point q are located on the same side; the projection point of the point v on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point u, and the distance between the projection point of the point v on the bottom surface of the groove and the point u is set to be f1，5mm≤f1Less than or equal to 10 mm; the projection point of the point q on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point p, and the distance between the projection point of the point q on the bottom surface of the groove and the point p is set to be f2；5mm≤f2≤10mm。
The back surface of the reference structural member 1 is set as a tapered wedge slide block contact surface 2, and the top surface of the bump is set as an insert contact surface 3; the distance between the bottom surface of the groove and the front surface of the reference structural member 1 is the width of a fracture section, and is marked as b; the fracture section width b satisfies the following condition:
Figure BDA0002104904970000031
wherein σShould be takenThe contact stress of the insert contact surface 3 during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the material of the reference structural component 1; a is the width of the bottom surface of the groove; k is a radical of1And k2Are all constants, k1The value of k is 1.1-1.32The value is 0.7-0.9. To those skilled in the art, σShould be takenThe method can be obtained by calculation according to a theoretical formula or by adopting a finite element analysis method. In consideration of low theoretical calculation accuracy, the method preferably adopts finite element calculation, so that the method can better meet the actual working condition, and the finite element calculation is a mature technology, such as ANSYS, ABAQUS and other structural finite element software.
Sigma in the inventionShould be takenIs determined according to the following steps: first, the formula F is 1.15 × σ × t × (L +. sigma.l)iX cos theta) calculating the forming force F, wherein sigma is the tensile strength of the plate to be formed, t is the thickness of the plate to be formed, L is the contour perimeter of the forming area, LiThe length of the ridge characteristic in the forming area and theta are the section inclination angle formed by the stamping direction and the ridge; then adopting finite element software to calculate sigma by applying forming force FShould be taken. For example, the embodiment shown in fig. 3, is calculated in the form of:
F＝1.15×σ×t×(l1+l2+l3+l4+l5x cos θ). Because the product area is mostly the side shaping of a certain angle, the contact stress sigma suffered by the double-material prevention device is theoretically calculatedShould be takenIn this embodiment, the contact stress σ of the insert backrest is obtained by applying the forming force F using abaqus large-scale general finite element softwareShould be taken。
[σLicense plate]The allowable tensile stress of the material of the reference structural member 1 can be obtained by inquiring a material mechanics manual.
The parameter a is the width of the bottom surface of the groove and is selected according to the contact area and the area of the lateral force, and the principle is that when the lateral force acts on the double-material prevention mechanism, the whole structure can ensure the uniformity and the stability of stress, so that the design of the parameter a only needs to be combined with the actual situation, and after the parameter a is determined, the most important parameter of the double-material prevention mechanism is the design of the fracture width b.
The parameter condition derivation process of the fracture section width b in the invention is as follows:
step one, the contact stress of the insert contact surface 3 is large or small sigma when the mold is normally producedShould be takenAs an initial condition, firstly, according to an internal force analysis method, calculating to obtain an internal force F of a strength failure section A-A of the stressed dual-material prevention devicen＝σShould be takenS1(ii) a Wherein S is1A is the width of the bottom surface of the groove, and h is the height of the reference structure 1.
Step two: the cross section size of the double-material prevention device is calculated when a single plate is stamped and formed under normal working conditions, so that the die strength is safe and reliable when the single plate is formed under normal conditions.
Selecting corresponding strength theory, considering impact load action in the stamping process, and selecting k11.1 to 1.3 times the allowable stress of the material, i.e., σ ≦ k1[σLicense plate]To obtain
Figure BDA0002104904970000041
From S2Bh and Fn＝σShould be takenah, obtaining the cross-sectional width
Figure BDA0002104904970000042
Here based on experience k1Further preferably 1.2; sigmaShould be takenThe contact stress of the insert contact surface 3 during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the material of the reference structural component 1; a is the width of the bottom surface of the groove.
Step three: when double plates appear in the stamping working condition, the forming force is increased rapidly, and in order to avoid the fracture caused by the extrusion of the molded surface of the die, the double-plate prevention device must be fractured to finish the forming work in advance. Namely calculating the maximum width dimension of the instantaneous fracture of the section A-A, considering the clearance of a male die and a female die of a die and the work hardening factor of the material of the double-material prevention device, and selecting k2The allowable stress of the material is 0.7 to 0.9 times, namely sigma is more than or equal to k2[σLicense plate]To obtain
Figure BDA0002104904970000051
From S2Bh and Fn＝σShould be takenah, obtaining the cross-sectional width
Figure BDA0002104904970000052
Here based on experience k2Further preferably 0.8; sigmaShould be takenThe contact stress of the insert contact surface 3 during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the material of the reference structural component 1; a is the width of the bottom surface of the groove.
The combination of the second step and the third step shows that the fracture section width b must satisfy the following condition:
Figure BDA0002104904970000053
wherein σShould be takenThe contact stress of the insert contact surface 3 during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the material of the reference structural component 1; a is the width of the bottom surface of the groove; k is a radical of1And k2Are all constants, k1The value of k is 1.1-1.32The value is 0.7-0.9.
As shown in fig. 4a and 4b, in the implementation of the apparatus, the mold structure includes a wedge block 6 and an insert 7, the reference structure 1 is fixedly mounted on the wedge block 6, the wedge block contact surface 2 is in contact with the wedge block 6, and the insert contact surface 3 is in contact with the insert 7. When the device is broken when the double materials are grabbed, the broken part is in an area enclosed by four points of p, q, u and v. In order to avoid that the device cannot be broken due to the fluctuation of the forming force in the process of forming the double materials, p, q, u and v breaking points are required to be staggered respectively and meet the condition that f is more than or equal to 5mm1≤10mm；5mm≤f2Less than or equal to 10 mm. The preferred mode is f1＝f2。
In order to enable the buffering and avoiding space to meet the requirements, the invention simultaneously limits the avoiding distance in the device: the thickness of the plate to be formed is set as t, d1≥2t,d2≥2t；d1The depth of the groove is the avoiding distance of the side of the wedge slide block 6; d2The height of the projection, i.e. the clearance on the side of the insert 7. Preferred mode is d1＝d2。
For convenience of installation, a connecting plate 4 is fixedly connected to the top surface of the reference structural member 1, the other end of the connecting plate 4 is arranged in an overhanging manner towards one side of the back surface of the reference structural member 1 relative to the reference structural member 1, and a bolt connecting hole 5 is arranged at the overhanging position. The connecting plate 4 is arranged at the position where the outer end face of the groove is intersected with the top face of the reference structural member 1; the connecting plates 4 are two and are symmetrically arranged by taking the central line of the width direction of the groove as an axis. In implementation, the connecting plate 4 can be directly welded to the top end of the reference structural member 1, and then the material double prevention device is mounted on the wedge sliding block 6 through the bolt 8. In addition, in the same mold structure, the reference structure member 1 may be provided in plurality side by side. Fig. 3 is an isometric view of this arrangement, in this embodiment, two are used, arranged side by side.

Claims (8)

1. The double-material prevention device of the automobile forming die is characterized in thatThe method comprises the following steps: the structure comprises a reference structural member (1), wherein the top surface and the bottom surface of the reference structural member (1) are planes and are parallel to each other, and the height of the reference structural member (1) is marked as h; the front surface and the back surface of the reference structural member (1) are both planes and are parallel to each other; a groove is arranged in the middle of the back of the reference structural member (1), the bottom surface of the groove is a plane parallel to the back of the reference structural member (1), and the depth of the groove is marked as d1The groove penetrates through the upper end and the lower end of the reference structural member (1), the width of the bottom surface of the groove is marked as a, and the width of the bottom surface of the groove is the same along the length direction of the groove; a rectangular bump is arranged in the middle of the front face of the reference structural member (1), the top face of the bump is a plane parallel to the front face of the reference structural member (1), and the height mark of the bump is d2Two end faces in the length direction of the bump are superposed with the upper end face and the lower end face of the reference structural member (1); the thickness of the plate to be formed is set as t, d1≥2t,d2≥2t；
On the same transverse section of the reference structural member (1), two end points of the bottom surface of the groove in the width direction of the groove are marked as u and p respectively, and two end points of the bottom end of the bump in the width direction of the bump are marked as v and q respectively; point u and point v are located on the same side, and point p and point q are located on the same side; the projection point of the point v on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point u, and the distance between the projection point of the point v on the bottom surface of the groove and the point u is set to be f1，5mm≤f1Less than or equal to 10 mm; the projection point of the point q on the bottom surface of the groove is closer to the center of the bottom surface of the groove than the point p, and the distance between the projection point of the point q on the bottom surface of the groove and the point p is set to be f2；5mm≤f2≤10mm；
The back surface of the reference structural member (1) is set as a wedge slide block contact surface (2), and the top surface of the bump is set as an insert contact surface (3); the distance between the bottom surface of the groove and the front surface of the reference structural member (1) is the width of a fracture section, and is marked as b; the fracture section width b satisfies the following condition:
Figure FDA0002640068500000011
wherein σShould be takenThe contact stress of the insert contact surface (3) during normal production of the mold is large; [ sigma ]License plate]The allowable tensile stress of the material of the reference structural member (1) is largeSmall; a is the width of the bottom surface of the groove; k is a radical of1And k2Are all constants, k1The value of k is 1.1-1.32The value is 0.7-0.9;
the reference structural part (1) is fixedly arranged on a wedge slide block (6) in the die, and during installation, a wedge slide block contact surface (2) on the reference structural part (1) is in contact with the wedge slide block (6) in the die, and an insert contact surface (3) is in contact with an insert (7) in the die.
2. The anti-double-material device for the automobile forming die as claimed in claim 1, wherein σ isShould be takenIs determined according to the following steps: first, the formula F is 1.15 × σ × t × (L +. sigma.l)iX cos theta) calculating the forming force F, wherein sigma is the tensile strength of the plate to be formed, t is the thickness of the plate to be formed, L is the contour perimeter of the forming area, LiThe length of the ridge characteristic in the forming area and theta are the section inclination angle formed by the stamping direction and the ridge; then adopting finite element software to calculate sigma by applying forming force FShould be taken。
3. The double-material prevention device for the automobile forming die as claimed in claim 1, wherein: d1＝d2。
4. The double-material prevention device for the automobile forming die as claimed in claim 1, wherein: f. of1＝f2。
5. The double-material prevention device for the automobile forming die as claimed in claim 1, wherein: k is a radical of1The value is 1.2, k2The value is 0.8.
6. The double-material prevention device for the automobile forming die as claimed in claim 1, wherein: the top surface of the reference structural member (1) is fixedly connected with a connecting plate (4), the other end of the connecting plate (4) is arranged in an overhanging mode towards one side of the back surface of the reference structural member (1) relative to the reference structural member (1), and a bolt connecting hole (5) is formed in the overhanging position.
7. The anti-double-material device of the automobile forming die as claimed in claim 6, wherein: the connecting plate (4) is arranged at the position where the outer end face of the groove is intersected with the top face of the reference structural member (1); the connecting plates (4) are two and are symmetrically arranged by taking the central line of the width direction of the groove as an axis.
8. The double-material prevention device for the automobile forming die as claimed in any one of claims 1 to 7, wherein: when the device is installed, the reference structural members (1) are arranged in parallel.
CN201910549150.0A 2019-06-24 2019-06-24 Double-material prevention device for automobile forming die Active CN110238309B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004276077A (en) * 2003-03-17 2004-10-07 Nsk Ltd Hydroforming apparatus and hydroforming method
CN204320939U (en) * 2014-11-28 2015-05-13 天津汽车模具股份有限公司 A kind of piecemeal drawing insert block key
CN204545218U (en) * 2015-04-24 2015-08-12 卡斯马汽车系统（重庆）有限公司 Device is grabbed in heat stamping and shaping production line discharging leakproof
CN207735419U (en) * 2017-11-30 2018-08-17 东莞特米勒电子科技有限公司 A kind of double material strips diel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004276077A (en) * 2003-03-17 2004-10-07 Nsk Ltd Hydroforming apparatus and hydroforming method
CN204320939U (en) * 2014-11-28 2015-05-13 天津汽车模具股份有限公司 A kind of piecemeal drawing insert block key
CN204545218U (en) * 2015-04-24 2015-08-12 卡斯马汽车系统（重庆）有限公司 Device is grabbed in heat stamping and shaping production line discharging leakproof
CN207735419U (en) * 2017-11-30 2018-08-17 东莞特米勒电子科技有限公司 A kind of double material strips diel

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